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Note: This page contains sample records for the topic "absorption fine structure" from the National Library of EnergyBeta (NLEBeta).
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1

X-ray absorption fine structure and magnetization characterization...  

NLE Websites -- All DOE Office Websites (Extended Search)

characterization of the metallic Co component in Co-doped ZnO thin films . X-ray absorption fine structure and magnetization characterization of the metallic Co...

2

Improved self-absorption correction for extended x-ray absorption fine-structure measurements  

SciTech Connect

Extended x-ray absorption fine-structure (EXAFS) data collected in the fluorescence mode are susceptible to an apparent amplitude reduction due to the self-absorption of the fluorescing photon by the sample before it reaches a detector. Previous treatments have made the simplifying assumption that the effect of the EXAFS on the correction term is negligible, and that the samples are in the thick limit. We present a nearly exact treatment that can be applied for any sample thickness or concentration, and retains the EXAFS oscillations in the correction term.

Booth, C.H.; Bridges, F.

2003-06-04T23:59:59.000Z

3

Accepted Manuscript Laboratory-based recording of holographic fine structure in x-ray absorption  

E-Print Network (OSTI)

be only performed using synchrotron radiation. Keywords: x-ray absorption, atomic structure, xAccepted Manuscript Laboratory-based recording of holographic fine structure in x-ray absorption structure in x-ray absorption anisotropy using polycapillary optics, Nucl. Instr. and Meth. in Phys. Res. B

Korecki, Pawe³

4

Directional fine structure in absorption of white x rays: A tomographic interpretation P. Korecki,1,  

E-Print Network (OSTI)

structure in absorption of white x rays can be interpreted as real-space projections of atomic structure from neigh- boring atoms.1 A straightforward analysis of the extended x-ray absorption fine structure of the absorbing atoms. Thus, the absorption cross section is effectively modulated by the x-ray scattering

Korecki, Pawe³

5

Laboratory-based recording of holographic fine structure in X-ray absorption anisotropy using polycapillary optics  

E-Print Network (OSTI)

10 April 2012 Available online 17 May 2012 Keywords: X-ray absorption Atomic structure XLaboratory-based recording of holographic fine structure in X-ray absorption anisotropy using) was characterized and used for recording two-dimensional maps of X-ray absorption anisotropy (XAA). XAA originates

Korecki, Pawe³

6

On variations in the fine-structure constant and stellar pollution of quasar absorption systems  

E-Print Network (OSTI)

At redshifts z_abs < 2, quasar absorption-line constraints on space-time variations in the fine-structure constant, alpha, rely on the comparison of MgII and FeII transition wavelengths. One potentially important uncertainty is the relative abundance of Mg isotopes in the absorbers which, if different from solar, can cause spurious shifts in the measured wavelengths and, therefore, alpha. Here we explore chemical evolution models with enhanced populations of intermediate-mass (IM) stars which, in their asymptotic giant branch (AGB) phase, are thought to be the dominant factories for heavy Mg isotopes at the low metallicities typical of quasar absorption systems. By design, these models partially explain recent Keck/HIRES evidence for a smaller alpha in z_abs < 2 absorption clouds than on Earth. However, such models also over-produce N, violating observed abundance trends in high-z_abs damped Lyman-alpha systems (DLAs). Our results do not support the recent claim of Ashenfelter, Mathews & Olive (2004b) that similar models of IM-enhanced initial mass functions (IMFs) may simultaneously explain the HIRES varying-alpha data and DLA N abundances. We explore the effect of the IM-enhanced model on Si, Al and P abundances, finding it to be much-less pronounced than for N. We also show that the 13C/12C ratio, as measured in absorption systems, could constitute a future diagnostic of non-standard models of the high-redshift IMF.

Y. Fenner; M. T. Murphy; B. K. Gibson

2005-01-10T23:59:59.000Z

7

Synchrotron x-ray fluorescence and extended x-ray absorption fine structure analysis  

SciTech Connect

The advent of dedicated synchrotron radiation sources has led to a significant increase in activity in many areas of science dealing with the interaction of x-rays with matter. Synchrotron radiation provides intense, linearly polarized, naturally collimated, continuously tunable photon beams, which are used to determine not only the elemental composition of a complex, polyatomic, dilute material but also the chemical form of the elements with improved accuracy. Examples of the application of synchrotron radiation include experiments in synchrotron x-ray fluorescence (SXRF) analysis and extended x-ray absorption fine structure (EXAFS) analysis. New synchrotron radiation x-ray microprobes for elemental analysis in the parts per billion range are under construction at several laboratories. 76 references, 24 figures.

Chen, J.R.; Gordon, B.M.; Hanson, A.L.; Jones, K.W.; Kraner, H.W.; Chao, E.C.T.; Minkin, J.A.

1984-01-01T23:59:59.000Z

8

Communications: Near edge x-ray absorption fine structure spectroscopy of aqueous adenosine triphosphate at the carbon and nitrogen  

E-Print Network (OSTI)

triphosphate at the carbon and nitrogen K-edges Daniel N. Kelly,1 Craig P. Schwartz,1,2 Janel S. Uejio,1 online xx xx xxxx Near edge x-ray absorption fine structure NEXAFS spectroscopy at the nitrogen-sphere association of Cu2+ did create observable broadening of the nitrogen spectrum, whereas outer

Cohen, Ronald C.

9

Polarization of absorption lines as a diagnostics of circumstellar, interstellar and intergalactic magnetic fields: Fine structure atoms  

E-Print Network (OSTI)

The relative population of the fine structure sublevels of an atom's ground state is affected by radiative transitions induced by an anisotropic radiation flux. This causes the alignment of atomic angular momentum. In terms of observational consequences for the interstellar and intergalactic medium, this results in the polarization of the absorption lines. In the paper we consider the conditions necessary for this effect and provide calculations of polarization from a few astrophysically important atoms and ions with multiple upper and lower levels for an arbitrary orientation of magnetic fields to the a) source of optical pumping, b) direction of observation, c) absorbed source. We also consider an astrophysically important ``degenerate'' case when the source of optical pumping coincides with the source of the absorbed radiation. We present analytical expressions that relate the degree of linear polarization and the intensity of absorption to the 3D orientation of the magnetic field with respect to the pumping source, the source of the absorbed radiation, and the direction of observations. We discuss how all these parameters can be determined via simultaneous observations of several absorption lines and suggest graphical means that are helpful in practical data interpretation. We prove that studies of absorption line polarization provide a unique tool to study 3D magnetic field topology in various astrophysical conditions.

Huirong Yan; A. Lazarian

2006-11-09T23:59:59.000Z

10

X-ray absorption fine structure spectroscopic determination of plutonium speciation at the Rocky Flats environmental technology  

SciTech Connect

X-ray Absorption Fine Structure spectroscopy was used to probe the speciation of the ppm level Pu in thirteen soil and concrete samples from the Rocky Flats Environmental Technology Site in support of the site remediation effort that has been successfully completed since these measurements. In addition to X-ray Absorption Near Edge Spectra, two of the samples yielded Extended X-ray Absorption Fine Structure spectra that could be analyzed by curve-fits. Most of these spectra exhibited features consistent with PU(IV), and more specificaJly, PuO{sub 2+x}-type speciation. Two were ambiguous, possibly indicating that Pu that was originally present in a different form was transforming into PuO{sub 2+x}, and one was interpreted as demonstrating the presence of an unusual Pu(VI) compound, consistent with its source being spills from a PUREX purification line onto a concrete floor and the resultant extreme conditions. These experimental results therefore validated models that predicted that insoluble PuO{sub 2+x} would be the most stable form of Pu in equilibrium with air and water even when the source terms were most likely Pu metal with organic compounds or a Pu fire. A corollary of these models' predictions and other in situ observations is therefore that the minimal transport of Pu that occurred on the site was via the resuspension and mobilization of colloidal particles. Under these conditions, the small amounts of diffusely distributed Pu that were left on the site after its remediation pose only a negligible hazard.

Lezama-pacheco, Juan S [Los Alamos National Laboratory; Conradson, Steven D [Los Alamos National Laboratory; Clark, David L [Los Alamos National Laboratory

2008-01-01T23:59:59.000Z

11

Characterization of Pt/Al/sub 2/O/sub 3/ catalysts by extended X-ray absorption fine structure  

SciTech Connect

Three different Pt/Al/sub 2/O/sub 3/ catalysts with average crystallite sizes of 95, 26, and 8 A., as assessed by hydrogen chemisorption measurements, and reference samples of platimum foil and PtO/sub 2/ were examined by transmission X-ray absorption measurements near the Pt L/sub I//sub I//sub I/ X-ray absorption edge. The fine structure for the reduced catalysts showed that the first Pt-Pt interatomic separation distance in the crystallites did not change with crystallite size. The 95 and 26 A. catalysts had Pt crystallites with fcc crystal structure, the same as in bulk platimum. Adsorption of carbon monoxide on the 26 A. catalyst at room temperature did not disturb crystallite structure, but oxygen chemisorption on that catalyst significantly reduced the magnitude of the first Pt-Pt peak, implying a reduction in the average number of first-nearest-neighbor Pt atoms. The Fourier transform indicated coordination of Pt atoms with oxygen. All Pt-Pt bands vanished when the 8 A. catalyst was exposed to oxygen. Platimum atom electron deficiency decreased significantly after carbon monoxide or oxygen adsorption on the catalysts.

Lornston, J.M.

1980-01-01T23:59:59.000Z

12

Structure of the c(22) coverage of Cl on Ag(100): A controversy resolved by surface extended x-ray-absorption fine-structure spectroscopy  

Science Journals Connector (OSTI)

By performing surface extended x-ray-absorption fine-structure measurements, we have resolved the discrepancies between previously reported results for the adsorbate-substrate bond length in Ag(100)c(22)-Cl. The Cl atoms form a simple overlayer occupying the fourfold hollows of the silver surface with a Cl-Ag distance of 2.690.03 A?, in agreement with a published low-energy electron diffraction study, though with greater precision.

G. M. Lamble, R. S. Brooks, J. C. Campuzano, D. A. King, and D. Norman

1987-07-15T23:59:59.000Z

13

Extended x-ray absorption fine structure studies on the iron-containing subunit of ribunucleotide reductase from Escherichia coli  

SciTech Connect

Iron K-edge X-ray absorption spectra were obtained on the protein B2, the small subunit of ribonucleotide reductase from Escherichia coli. Protein B2 contains a binuclear iron center with many properties in common with the iron center of oxidized hemerythrins. The extended x-ray absorption fine structure (EXAFS) measurements on protein B2 were analyzed and compared with published data for oxyhemerythrin. In protein B2 there are, in the first coordination shell around each Fe atom, five or six oxygen or nitrogen atoms that are directly coordinated ligands. In oxyhemerythrin there are six ligands to each iron. As in oxyhemerythrin, one of the ligands in the first shell of protein B2 is at a short distance, about 1.78 A, confirming the existence of a ..mu..-oxo bridge. The other atoms of the first shell are at an average distance of 2.04 A, which is about 0.1 A shorter than in oxyhemerythrin. In protein B2 the Fe-Fe distance is in the range 3.26-3.48 A, and the bridging angle falls between 130 and 150/sup 0/. On the basis of these data, there is no direct evidence for any histidine ligands in protein B2, but the noise level leaves way for the possibility of a maximum of about three histidines for each Fe pair. The x-ray absorption spectrum of a hydroxyurea-treated sample was not significantly different from that of the native protein B2, which implies that no significant alteration in the structure of the iron site occurs upon destruction of the tyrosine radical.

Bunker, G.; Petersson, L.; Sjoeberg, B.M.; Sahlin, M.; Chance, M.; Chance, B.; Ehrenberg, A.

1987-07-28T23:59:59.000Z

14

Effect of Residence Time on Ni-Sorption Mechanisms on Clay and Oxide Minerals: An X-ray Absorption Fine Structure (XAFS) Study  

E-Print Network (OSTI)

Effect of Residence Time on Ni-Sorption Mechanisms on Clay and Oxide Minerals: An X-ray Absorption Fine Structure (XAFS) Study A. M. Scheidegger and G. M. Lamble Metal sorption on clay and oxide in reaction rate has been attributed to metal sorption onto sites of lower reactivity, diffusion

Sparks, Donald L.

15

Mechanism of Pb Adsorption to Fatty Acid Langmuir Monolayers Studied by X-ray Absorption Fine Structure Spectroscopy  

SciTech Connect

The local atomic environment of lead (Pb) adsorbed to a CH{sub 3}(CH{sub 2}){sub 19}COOH Langmuir monolayer was investigated in situ using grazing-incidence X-ray absorption fine structure (GI-XAFS) spectroscopy at the Pb L{sub III} edge. Measurements were performed at pH 6.5 of the 10{sup -5} M PbCl{sub 2} solution subphase, a condition under which grazing incidence diffraction (GID) revealed a large-area commensurate superstructure underneath the close-packed organic monolayer. The XAFS results indicate covalent binding of the Pb cations to the carboxyl headgroups, and the observed Pb-Pb coordination suggests that the metal is adsorbed as a hydrolysis polymer, rather than as individual Pb{sup 2+} ions. The data are consistent with a bidentate chelating mechanism and a one Pb atom to one carboxyl headgroup binding stoichiometry. We discuss how this adsorption model can explain the peculiarities observed with Pb in previous metal-Langmuir monolayer studies. A systematic study of lead perchlorate and lead acetate aqueous solutions is presented and used in the analysis. XAFS multiple scattering effects from alignment of the Pb-C-C atoms in the lead acetate solutions are reported.

Boyanov, M.I.; Kmetko, J.; Shibata, T.; Datta, A.; Dutta, P.; Bunker, B.A. (NWU); (Notre)

2010-09-30T23:59:59.000Z

16

Nuclear quantum effects in the structure and lineshapes of the N{sub 2} near-edge x-ray absorption fine structure spectrum  

SciTech Connect

We study the relative ability of several models of x-ray absorption spectra to capture the Franck-Condon structure apparent from an experiment on gaseous nitrogen. In doing so, we adopt the Born-Oppenheimer approximation and a constrained density functional theory method for computing the energies of the x-ray-excited molecule. Starting from an otherwise classical model for the spectrum, we systematically introduce more realistic physics, first by substituting the quantum mechanical nuclear radial density in the bond separation R for the classical radial density, then by adding the effect of zero-point energy and other level shifts, and finally by including explicit rovibrational quantization of both the ground and excited states. The quantization is determined exactly, using a discrete variable representation (DVR). We show that the near-edge x-ray absorption fine structure (NEXAFS) spectrum can be predicted semiquantitatively within this framework. We also address the possibility of non-trivial temperature dependence in the spectrum. By using constrained density functional theory in combination with more accurate potentials, we demonstrate that it is possible to improve the predicted spectrum. Ultimately, we establish the predictive limits of our method with respect to vibrational fine structure in NEXAFS spectra.

Fatehi, Shervin; Schwartz, Craig P.; Saykally, Richard J. [Department of Chemistry, University of California, Berkeley, California 94720 (United States) and Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States); Prendergast, David [Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)

2010-03-07T23:59:59.000Z

17

A combined fit of total scattering and extended x-ray absorption fine structure data for local-structure determination in crystalline materials  

SciTech Connect

Reverse Monte Carlo (RMC) refinements of local structure using a simultaneous fit of X-ray/neutron total scattering and extended X-ray absorption fine structure (EXAFS) data were developed to incorporate an explicit treatment of both single- and multiple-scattering contributions to EXAFS. The refinement algorithm, implemented as an extension to the public domain computer software RMCProfile, enables accurate modeling of EXAFS over distances encompassing several coordination shells around the absorbing species. The approach was first tested on Ni, which exhibits extensive multiple scattering in EXAFS, and then applied to perovskite-like SrAl{sub 1/2}Nb{sub 1/2}O{sub 3}. This compound crystal1izes with a cubic double-perovskite structure but presents a challenge for local-structure determination using a total pair-distribution function (PDF) alone because of overlapping peaks of the constituent partial PDFs (e.g. Al-O and Nb-O or Sr-O and O-O). The results obtained here suggest that the combined use of the total scattering and EXAFS data provides sufficient constraints for RMC refinements to recover fine details of local structure in complex perovskites. Among other results, it was found that the probability density distribution for Sr in SrAl{sub 1/2}Nb{sub 1/2}O{sub 3} adopts T{sub d} point-group symmetry for the Sr sites, determined by the ordered arrangement of Al and Nb, as opposed to a spherical distribution commonly assumed in traditional Rietveld refinements.

Proffen, Thomas E [Los Alamos National Laboratory; Krayzman, Victor [NIST; Levin, Igor [NIST; Tucker, Matt [ISIS, UK

2009-01-01T23:59:59.000Z

18

Analysis of the near-edge X-ray-absorption fine-structure of anthracene: A combined theoretical and experimental study  

SciTech Connect

The near-edge fine structure of the carbon K-edge absorption spectrum of anthracene was measured and theoretically analyzed by density functional theory calculations implemented in the StoBe code. It is demonstrated that the consideration of electronic relaxation of excited states around localized core holes yields a significant improvement of the calculated excitation energies and reproduces the experimentally observed fine structure well. The detailed analysis of excitation spectra calculated for each symmetry inequivalent excitation center allows in particular to examine the influence of chemical shifts and core hole effects on the excitation energies. Moreover, the visualization of final states explains the large variations in the oscillator strength of various transitions as well as the nature of Rydberg-states that exhibit a notable density of states below the ionization potentials.

Klues, Michael; Witte, Gregor, E-mail: gregor.witte@physik.uni-marburg.de [Molekulare Festkrperphysik, Philipps-Universitt Marburg (Germany)] [Molekulare Festkrperphysik, Philipps-Universitt Marburg (Germany); Hermann, Klaus, E-mail: hermann@FHI-Berlin.MPG.de [Inorganic Chemistry Department, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin (Germany)] [Inorganic Chemistry Department, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin (Germany)

2014-01-07T23:59:59.000Z

19

Study of hard disk and slider surfaces using X-ray photoemission electron microscopy and near-edge X-ray absorption fine structure spectroscopy  

SciTech Connect

X-ray Photo Emission Electron Microscopy (X-PEEM) and Near Edge X-ray Absorption Fine Structure (NEXAFS) spectroscopy were applied to study the properties of amorphous hard carbon overcoats on disks and sliders, and the properties of the lubricant. The modification of lubricants after performing thermal desorption studies was measured by NEXAFS, and the results are compared to the thermal desorption data. The study of lubricant degradation in wear tracks is described. Sliders were investigated before and after wear test, and the modification of the slider coating as well as the transfer of lubricant to the slider was studied. The studies show that the lubricant is altered chemically during the wear. Fluorine is removed and carboxyl groups are formed.

Anders, S.; Stammler, T. [Lawrence Berkeley National lab., CA (United States). Advanced Light Source Div.; Bhatia, C.S. [SSD/IBM, San Jose, CA (United States); Stoehr, J. [IBM Research Div., San Jose, CA (United States). Almaden Research Center; Fong, W.; Chen, C.Y.; Bogy, D.B. [Univ. of California, Berkeley, CA (United States)

1998-04-01T23:59:59.000Z

20

PRELIMINARY IN-SITU X-RAY ABSORPTION FINE STRUCTURE EXAMINATION OF PT/C AND PTCO/C CATHODE CATALYSTS IN AN OPERATIONAL POLYMER ELECTROLYTE FUEL CELL  

SciTech Connect

State-of-the-art polymer electrolyte fuel cells require a conditioning period to reach optimized cell performance. There is insuffi cient understanding about the behavior of catalysts during this period, especially with regard to the changing environment of the cathode electrocatalyst, which is typically Pt nanoparticles supported on high surface area Vulcan XC-72 carbon (Pt/C). The purpose of this research was to record preliminary observations of the changing environment during the conditioning phase using X-Ray Absorption Fine Structure (XAFS) spectroscopy. XAFS was recorded for a Pt/C cathode at the Pt L3-edge and a PtCo/C cathode at both the Pt L3-edge and Co K-edge. Using precision machined graphite cell-blocks, both transmission and fl uorescence data were recorded at Sector 12-BM-B of Argonne National Laboratorys Advanced Photon Source. The fl uorescence and transmission edge steps allow for a working description of the changing electrocatalyst environment, especially water concentration, at the anode and cathode as functions of operating parameters. These features are discussed in the context of how future analysis may correlate with potential, current and changing apparent thickness of the membrane electrode assembly through loss of catalyst materials (anode, cathode, carbon support). Such direct knowledge of the effect of the conditioning protocol on the electrocatalyst may lead to better catalyst design. In turn, this may lead to minimizing, or even eliminating, the conditioning period.

Phelan, B.T.; Myers, D.J.; Smith, M.C.

2009-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "absorption fine structure" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

Assignment of near-edge x-ray absorption fine structure spectra of metalloporphyrins by means of time-dependent density-functional calculations  

SciTech Connect

The C 1s and N 1s near-edge x-ray absorption fine structure (NEXAFS) spectra of three prototype tetraphenyl porphyrin (TPP) molecules are discussed in the framework of a combined experimental and theoretical study. We employ time-dependent density-functional theory (TDDFT) to compute the NEXAFS spectra of the open- and closed-shell metalloporphyrins CoTPP and ZnTPP as well as the free-base 2HTPP in realistic nonplanar conformations. Using Becke's well-known half-and-half hybrid functional, the computed core excitation spectra are mostly in good agreement with the experimental data in the low-energy region below the appropriate ionization threshold. To make these calculations feasible, we apply a new, simple scheme based on TDDFT using a modified single-particle input spectrum. This scheme is very easy to implement in standard codes and allows one to compute core excitation spectra at a similar cost as ordinary UV/vis spectra even for larger molecules. We employ these calculations for a detailed assignment of the NEXAFS spectra including subtle shifts in certain peaks of the N 1s spectra, which depend on the central coordination of the TPP ligand. We furthermore assign the observed NEXAFS resonances to the individual molecular subunits of the investigated TPP molecules.

Schmidt, Norman; Fink, Rainer [Department Chemie und Pharmazie, Lehrstuhl fuer Physikalische Chemie II and ICMM, Universitaet Erlangen-Nuernberg, Egerlandstrasse 3, 91058 Erlangen (Germany); Hieringer, Wolfgang [Department Chemie und Pharmazie, Lehrstuhl fuer Theoretische Chemie, Universitaet Erlangen-Nuernberg, Egerlandstrasse 3, 91058 Erlangen (Germany)

2010-08-07T23:59:59.000Z

22

Surface complexation and precipitate geometry for aqueous Zn(II) sorption on ferrihydrite I: X-ray absorption extended fine structure spectroscopy analysis  

Science Journals Connector (OSTI)

Two-line ferrihydrite samples precipitated and then exposed to a range of aqueous Zn solutions (10?5 to 10?3 M), and also coprecipitated in similar Zn solutions (pH 6.5), have been examined by Zn and Fe K-edge X-ray absorption spectroscopy. Typical Zn complexes on the surface have Zn-O distances of 1.97(.02) and coordination numbers of about 4.0(0.5), consistent with tetrahedral oxygen coordination. This contrasts with Zn-O distances of 2.11(.02) and coordination numbers of 6 to 7 in the aqueous Zn solutions used in sample preparation. X-ray absorption extended fine structure spectroscopy (EXAFS) fits to the second shell of cation neighbors indicate as many as 4 Zn-Fe neighbors at 3.44(.04) in coprecipitated samples, and about two Zn-Fe neighbors at the same distance in adsorption samples. In both sets of samples, the fitted coordination number of second shell cations decreases as sorption density increases, indicating changes in the number and type of available complexing sites or the onset of competitive precipitation processes. Comparison of our results with the possible geometries for surface complexes and precipitates suggests that the Zn sorption complexes are inner sphere and at lowest adsorption densities are bidentate, sharing apical oxygens with adjacent edge-sharing Fe(O,OH)6 octahedra. Coprecipitation samples have complexes with similar geometry, but these are polydentate, sharing apices with more than two adjacent edge-sharing Fe(O,OH)6 polyhedra. The results are inconsistent with Zn entering the ferrihydrite structure (i.e., solid solution formation) or formation of other Zn-Fe precipitates. The fitted Zn-Fe coordination numbers drop with increasing Zn density with a minimum of about 0.8(.2) at Zn/(Zn + Fe) of 0.08 or more. This change appears to be attributable to the onset of precipitation of zinc hydroxide polymers with mainly tetrahedral Zn coordination. At the highest loadings studied, the nature of the complexes changes further, and a second type of precipitate forms. This has a structure based on a brucite layer topology, with mainly octahedral Zn coordination. Amorphous zinc hydroxide samples prepared for comparison had a closely similar local structure. Analysis of the Fe K-edge EXAFS is consistent with surface complexation reactions and surface precipitation at high Zn loadings with little or no Fe-Zn solid solution formation. The formation of Zn-containing precipitates at solution conditions two or more orders of magnitude below their solubility limit is compared with other sorption and spectroscopic studies that describe similar behavior.

G.A Waychunas; C.C Fuller; J.A Davis

2002-01-01T23:59:59.000Z

23

Near-Edge X-ray Absorption Fine Structure Imaging of Spherical and Flat Counterfaces of Ultrananocrystalline Diamond Tribological Contacts: A Correlation of Surface Chemistry and Friction  

SciTech Connect

A recently installed synchrotron radiation near-edge X-ray absorption fine structure (NEXAFS) full field imaging electron spectrometer was used to spatially resolve the chemical changes of both counterfaces from an ultra-nanocrystalline diamond (UNCD) tribological contact. A silicon flat and Si{sub 3}N{sub 4} sphere were both coated with UNCD, and employed to form two wear tracks on the flat in a linear reciprocating tribometer. The first wear track was produced using a new, unconditioned sphere whose surface was thus conditioned during this first experiment. This led to faster run-in and lower friction when producing a second wear track using the conditioned sphere. The large depth of field of the magnetically guided NEXAFS imaging detector enabled rapid, large area spectromicroscopic imaging of both the spherical and flat surfaces. Laterally resolved NEXAFS data from the tribological contact area revealed that both substrates had an as-grown surface layer that contained a higher fraction of sp{sup 2}-bonded carbon and oxygen which was mechanically removed. Unlike the flat, the film on the sphere showed evidence of having graphitic character, both before and after sliding. These results show that the graphitic character of the sphere is not solely responsible for low friction and short run-in. Rather, conditioning the sphere, likely by removing asperities and passivating dangling bonds, leads to lower friction with less chemical modification of the substrate in subsequent tests. The new NEXAFS imaging spectroscopy detector enabled a more complete understanding of the tribological phenomena by imaging, for the first time, the surface chemistry of the spherical counterface which had been in continual contact during wear track formation.

A Konicek; C Jaye; M Hamilton; W Sawyer; D Fischer; R Carpick

2011-12-31T23:59:59.000Z

24

Structural Analysis of the Mn(IV)/Fe(III) Cofactor of Chlamydia Trachomatis Ribonucleotide Reductase By Extended X-Ray Absorption Fine Structure Spectroscopy And Density Functional Theory Calculations  

SciTech Connect

The class Ic ribonucleotide reductase from Chlamydia trachomatis (C{bar A}) uses a stable Mn(lV)/ Fe(lll) cofactor to initiate nucleotide reduction by a free-radical mechanism. Extended X-ray absorption fine structure (EXAFS) spectroscopy and density functional theory (DFT) calculations are used to postulate a structure for this cofactor. Fe and Mn K-edge EXAFS data yield an intermetallic distance of -2.92 {angstrom}. The Mn data also suggest the presence of a short 1.74 {angstrom} Mn-O bond. These metrics are compared to the results of DFT calculations on 12 cofactor models derived from the crystal structure of the inactive Fe2(lll/ III) form of the protein. Models are differentiated by the protonation states of their bridging and terminal OH{sub x} ligands as well as the location of the Mn(lV) ion (site 1 or 2). The models that agree best with experimental observation feature a{mu}-1, 3-carboxylate bridge (E120), terminal solvent (H{sub 2}O/OH) to site 1, one {mu}-O bridge, and one {mu}-OH bridge. The site-placement of the metal ions cannot be discerned from the available data.

Younker, J.M.; Krest, C.M.; Jiang, W.; Krebs, C.; Bollinger, J.M.Jr.; Green, M.T.

2009-05-28T23:59:59.000Z

25

Limits on the temporal variation of the fine structure constant, quark masses and strong interaction from quasar absorption spectra and atomic clock experiments  

E-Print Network (OSTI)

We perform calculations of the dependence of nuclear magnetic moments on quark masses and obtain limits on the variation of $(m_q/\\Lambda_{QCD})$ from recent measurements of hydrogen hyperfine (21 cm) and molecular rotational transitions in quasar absorption systems, atomic clock experiments with hyperfine transitions in H, Rb, Cs, Yb$^+$, Hg$^+$ and optical transition in Hg$^+$. Experiments with Cd$^+$, deuterium/hydrogen, molecular SF$_6$ and Zeeman transitions in $^3$He/Xe are also discussed.

V. V. Flambaum; D. B. Leinweber; A. W. Thomas; R. D. Young

2004-02-10T23:59:59.000Z

26

On the Detectability of the Hydrogen 3-cm Fine Structure Line from the EoR  

E-Print Network (OSTI)

A soft ultraviolet radiation field, 10.2 eV EoR) excites the 2p (directly) and 2s (indirectly) states of atomic hydrogen. Because the 2s state is metastable, the lifetime of atoms in this level is relatively long, which may cause the 2s state to be overpopulated relative to the 2p state. It has recently been proposed that for this reason, neutral intergalactic atomic hydrogen gas may be detected in absorption in its 3-cm fine-structure line (2s_1/2 -> 2p_3/2) against the Cosmic Microwave Background out to very high redshifts. In particular, the optical depth in the fine-structure line through neutral intergalactic gas surrounding bright quasars during the EoR may reach tau~1e-5. The resulting surface brightness temperature of tens of micro K (in absorption) may be detectable with existing radio telescopes. Motivated by this exciting proposal, we perform a detailed analysis of the transfer of Lyman beta,gamma,delta,... radiation, and re-analyze the detectability of the fine-structure line in neutral intergalactic gas surrounding high-redshift quasars. We find that proper radiative transfer modeling causes the fine-structure absorption signature to be reduced tremendously to tauEoR cannot reveal its presence in the 3-cm fine-structure line to existing radio telescopes.

Mark Dijkstra; Adam Lidz; Jonathan R. Pritchard; Lincoln J. Greenhill; D. A. Mitchell; S. M. Ord; Randal B. Wayth

2009-02-25T23:59:59.000Z

27

A Model of Varying Fine Structure Constant and Varying Speed of Light  

E-Print Network (OSTI)

The recent evidence for a cosmological evolution of the fine structure constant \\alpha=e^2/\\hbar c found from an analysis of absorption systems in the spectra of distant quasars, is modelled by a cosmological scenario in which it is assumed that only the speed of light varies. The model fits the spectral line data and can also lead to a solution of the initial value problems in cosmology.

J. W. Moffat

2001-09-20T23:59:59.000Z

28

X-ray Absorption Spectroscopy  

E-Print Network (OSTI)

type: Review X-ray Absorption Spectroscopy Junko Yano andPhotosystem II; XAS, X-ray absorption spectroscopy; EXAFS,X-ray absorption fine structure; EPR, electron paramagnetic

Yano, Junko

2010-01-01T23:59:59.000Z

29

AN X-RAY ABSORPTION SPECTROSCOPY STUDY OF MANGANESE CONTAINING COMPOUNDS AND PHOTOSYNTHETIC SPINACH CHLOROPLASTS  

E-Print Network (OSTI)

II. Extended X-ray Absorption Fine Structure (EXAFS) TheoryIII. X-ray Absorption Spectroscopy (XAS) ExperimentIII. EXTENDED X-RAY ABSORPTION FINE STRUCTURE (EXAFS) DATA

Kirby, Jon Allan

2012-01-01T23:59:59.000Z

30

Fine Structure Studies in Proton Emission  

NLE Websites -- All DOE Office Websites (Extended Search)

Structure Studies in Proton Emission In order to understand the evolution of single particle wave functions and deformations beyond the proton drip line, a program has been...

31

Effects of {pi}-stacking interactions on the near carbon K-edge x-ray absorption fine structure: A theoretical study of the ethylene pentamer and the phthalocyanine dimer  

SciTech Connect

X-ray absorption spectra have been determined for ethylene and free base phthalocyanine at the carbon K-edge with use of the complex polarization propagator method combined with Kohn-Sham density functional theory and the Coulomb attenuated method B3LYP exchange-correlation functional. Apart from isolated molecules, the study includes {pi}-stacked systems of the phthalocyanine dimer and the ethylene dimer, trimer, tetramer, and pentamer. For ethylene, {pi}-stacking involves a reduction in transition energy of the valence {pi}*-band by some 70 meV and large spectral changes (regarding also shape and intensity) of the Rydberg bands. For phthalocyanine, there are large spectral changes in the entire valence {pi}*-part of the spectrum.

Linares, Mathieu; Stafstroem, Sven; Norman, Patrick [Department of Physics, Chemistry and Biology, Linkoeping University, SE-581 83 Linkoeping (Sweden)

2009-03-14T23:59:59.000Z

32

Principles and fundamentals of xray absorption fine structure in actinides  

E-Print Network (OSTI)

with EXAFS. . Organic complexation of uranyl ligands in tank wastes is still poorly understood . Searching increase roughly as Z 2 . 1 10 100 0.01 0.1 1 10 M L III L II L I K Xenon µ (cm ­1 ) E (keV) From Mc

Booth, Corwin H.

33

The Speed of Light and the Fine Structure Constant  

E-Print Network (OSTI)

The fine structure constant $\\alpha $ includes the speed of light as given by $\\alpha =\\frac{e^{2}}{4\\pi \\epsilon_{0}c\\hbar}$. It is shown here that, following a $TH\\epsilon \\mu $ formalism, interpreting the permittivity $\\epsilon_{0}$ and permeabiliy $\\mu_{0}$ of free space under Lorentz local and position invariance, this is not the case. The result is a new expression as $\\alpha =\\frac{e^{2}}{4\\pi \\hbar}$ in a new system of units for the charge that preserves local and position invariance. Hence, the speed of light does not explicitly enter in the constitution of the fine structure constant. The new expressions for the Maxwell's equations are derived and some cosmological implications discussed.

Antonio Alfonso-Faus

2000-08-04T23:59:59.000Z

34

Physics 250 -Measurements of the Fine Structure Constant Derek Kimball January 2000 1  

E-Print Network (OSTI)

Physics 250 - Measurements of the Fine Structure Constant Derek Kimball January 2000 1 #12;Physics 250 - Measurements of the Fine Structure Constant Derek Kimball January 2000 2 #12;Physics 250 - Measurements of the Fine Structure Constant Derek Kimball January 2000 3 #12;Physics 250 - Measurements

Budker, Dmitry

35

Fine structure transitions of C+ in collisions with H2  

E-Print Network (OSTI)

Hr' If s specifies the orientation of the internuclear axis with respect to axes fixed in space, the eigenfunc tions YJ m (8) of Hr satisfy the equation b Jb (2) YlbmJb is a spherical harmonic. The Hamiltonian of the carbon ion C+ can be written... dissociate asymp totically to a product of the states C+(2P) and Hz(X1:E;). For perpendicular approach, the symmetry is CZv and there are three adiabatic molecular states, zA 1 , zBl> and zB2 Simultaneous excitation of fine-structure and molecu lar...

Chu, Shih-I; Dalgarno, A.

1975-01-01T23:59:59.000Z

36

Solar Radio Bursts with Spectral Fine Structures in Preflares  

E-Print Network (OSTI)

A good observation of preflare activities is important for us to understand the origin and triggering mechanism of solar flares, and to predict the occurrence of solar flares. This work presents the characteristics of microwave spectral fine structures as preflare activities of four solar flares observed by Ond\\v{r}ejov radio spectrograph in the frequency range of 0.8--2.0 GHz. We found that these microwave bursts which occurred 1--4 minutes before the onset of flares have spectral fine structures with relatively weak intensities and very short timescales. They include microwave quasi-periodic pulsations (QPP) with very short period of 0.1-0.3 s and dot bursts with millisecond timescales and narrow frequency bandwidths. Accompanying these microwave bursts, there are filament motions, plasma ejection or loop brightening on the EUV imaging observations and non-thermal hard X-ray emission enhancements observed by RHESSI. These facts may reveal certain independent non-thermal energy releasing processes and partic...

Zhang, Yin; Karlick, Marian; Mszrosov, Hana; Huang, Jing; Tan, Chengming; Simes, Paulo

2014-01-01T23:59:59.000Z

37

Hydrogen Atom and Time Variation of Fine-Structure Constant  

E-Print Network (OSTI)

In this paper, we have solved the de Sitter special relativistic ($\\mathcal{SR}_{cR}$-) Dirac equation of hydrogen in the earth-QSO(quasar) framework reference by means of the adiabatic approach. The aspects of geometry effects of de Sitter space-time described by Beltrami metric are explored and taken into account. It is found that the $\\mathcal{SR}_{cR}$-Dirac equation of hydrogen is a time dependent quantum Hamiltonian system. We provide an explicit calculation to justify the adiabatic approach in dealing with this time-dependent system. Since the radius of de Sitter sphere $R$ is cosmologically large, the evolution of the system is very slow so that the adiabatic approximation legitimately works with high accuracy. We conclude that the electromagnetic fine-structure constant, the electron mass and the Planck constant are time variations. This prediction of fine-structure constant is consistent with the presently available observation data. For confirming it further, experiments/observations are required.

Mu-Lin Yan

2009-11-21T23:59:59.000Z

38

Fine structure changing collisions between ultra-cold lithium atoms  

SciTech Connect

The authors have designed and assembled an experiment to determine the rate of fine structure changing collisions between ultra-cold ({approximately} 1 mK) laser cooled Li atoms. The atoms are confined by a magneto-optical trap which consists of six polarized orthogonal laser beams tuned slightly below the 2S{sub 1/2}-2P{sub 3/2} resonance frequency of lithium. Measurements show that about 2 x 10{sup 7} atoms are confined to a roughly spherical region of about 1 mm in diameter. Fine structure changing collisions occur when an atom in the 2S{sub 1/2} state and an atom in the 2P{sub 3/2} state collide, and yield an atom in the 2S{sub 1/2} state and an atom in the 2P{sub 1/2} state, with an energy release corresponding to about 10 GHz. This energy adds kinetic energy to the atoms in the trap, and knocks atoms out of the trap. The authors have devised a method to measure the rate of this collisional loss mechanism. The method uses a laser diode and a dye laser to selectively photo-ionize the 2P{sub 1/2} atoms, and a channeltron particle multipiler measures the rate of ion formation. We will report the progress of this experiment.

Anderson, B.P.; Ritchie, N.W.M.; Xiao, Y.Y. [and others

1992-12-01T23:59:59.000Z

39

Fine Structure of the Hydrogen Atom. Part I  

Science Journals Connector (OSTI)

The fine structure of the hydrogen atom is studied by a microwave method. A beam of atoms in the metastable 2S122 state is produced by bombarding atomic hydrogen. The metastable atoms are detected when they fall on a metal surface and eject electrons. If the metastable atoms are subjected to radiofrequency power of the proper frequency, they undergo transitions to the non-metastable states 2P122 and 2P322 and decay to the ground state 1S122 in which they are not detected. In this way it is determined that contrary to the predictions of the Dirac theory, the 2S122 state does not have the same energy as the 2P122 state, but lies higher by an amount corresponding to a frequency of about 1000 Mc/sec. Within the accuracy of the measurements, the separation of the 2P122 and 2P322 levels is in agreement with the Dirac theory. No differences in either level shift or doublet separation were observed between hydrogen and deuterium. These results were obtained with the first working apparatus. Much more accurate measurements will be reported in subsequent papers as well as a detailed comparison with the quantum electrodynamic explanation of the level shift by Bethe.Among the topics discussed in connection with this work are (1) spectroscopic observations of the H? line, (2) early attempts to use microwaves to study the hydrogen fine structure, (3) existence of metastable hydrogen atoms, their properties and methods for their production and detection, (4) estimates of yield and r-f power requirements, (5) Zeeman and hyperfine structure effects, (6) quenching of metastable hydrogen atoms by electric and motional electric fields, (7) production of a polarized beam of metastable hydrogen atoms.

Willis E. Lamb; Jr. and Robert C. Retherford

1950-08-15T23:59:59.000Z

40

Gravitation, the 'Dark Matter' Effect and the Fine Structure Constant  

E-Print Network (OSTI)

Gravitational anomalies such as the mine/borehole g anomaly, the near-flatness of the spiral galaxy rotation-velocity curves, currently interpreted as a `dark matter' effect, the absence of that effect in ordinary elliptical galaxies, and the ongoing problems in accurately determining Newton's gravitational constant G_N are explained by a generalisation of the Newtonian theory of gravity to a fluid-flow formalism with one new dimensionless constant. By analysing the borehole data this constant is shown to be the fine structure constant alpha=1/137. The spiral galaxy `dark matter' effect and the globular cluster `black hole' masses are then correctly predicted. This formalism also explains the cause of the long-standing uncertainties in G_N and leads to the introduction of a fundamental gravitational constant G not = G_N with value G=(6.6526 +/- 0.013)x 10^-11 m^3s^{-2}kg^{-1}. The occurrence of alpha implies that space has a quantum structure, and we have the first evidence of quantum gravity effects.

Reginald T. Cahill

2005-04-07T23:59:59.000Z

Note: This page contains sample records for the topic "absorption fine structure" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

AN ATLAS-BASED DEEP BRAIN STRUCTURE SEGMENTATION METHOD: FROM COARSE POSITIONING TO FINE SHAPING  

E-Print Network (OSTI)

AN ATLAS-BASED DEEP BRAIN STRUCTURE SEGMENTATION METHOD: FROM COARSE POSITIONING TO FINE SHAPING Segmentation of deep brain structures is a challenging task for MRI images due to blurry structure boundaries brain structures and determine an optimal sequence for the structure- by-structure segmentation. After

Chung, Albert C. S.

42

An in-situ cell for characterization of solids by soft X-ray absorption  

E-Print Network (OSTI)

Scientific Instruments a Absorption (a.u. ) b d 0.01 abs cJ. Lynch, in X-ray Absorption Fine Structure for Catalysts18, pp. 431-512. X-ray Absorption: Principles, Applications,

2007-01-01T23:59:59.000Z

43

X-ray Absorption Spectroscopy Study of Prototype Chemical Systems: Theory vs. Experiment  

E-Print Network (OSTI)

acids by Near Edge X-ray Absorption Fine Structure (NEXAFS)X-ray Absorption Spectroscopy Study of Prototype ChemicalGlaeser Spring 2010 X-ray Absorption Spectroscopy Study of

Schwartz, Craig Philip

2010-01-01T23:59:59.000Z

44

Optical Absorption, Stability and Structure of NpO2+ Complexes with Dicarboxylic Acids  

E-Print Network (OSTI)

Np(V)/IDA complex, the absorption band still shows, but theOptical Absorption, Stability and Structure of NpO 2+and the intensity of the absorption band of NpO 2+ at 980 nm

Guoxin Tian; Linfeng Rao

2006-01-01T23:59:59.000Z

45

X-ray absorption study of the electronic structure of Mn-doped amorphous Si  

E-Print Network (OSTI)

X-ray absorption study of the electronic structure of Mn-?x ) is studied by X-ray absorption spectroscopy at the Mn Land featureless L 3,2 absorption peaks, corresponding to an

Zeng, Li

2008-01-01T23:59:59.000Z

46

Fine scale structural variants distinguish the genomes of Drosophilia melanogaster and D. pseudoobscura  

E-Print Network (OSTI)

RESEARCH Open Access Fine scale structural variants distinguish the genomes of Drosophila melanogaster and D. pseudoobscura Stuart J Macdonald* and Anthony D Long Abstract Background: A primary objective of comparative genomics is to identify... genomic elements of functional significance that contribute to phenotypic diversity. Complex changes in genome structure (insertions, duplications, rearrangements, translocations) may be widespread, and have important effects on organismal diversity. Any...

Macdonald, Stuart J.

2006-07-07T23:59:59.000Z

47

Fine Structure in the Red Algae. III. A General Survey of Cell-Wall Structure in the Red Algae  

Science Journals Connector (OSTI)

...research-article Fine Structure in the Red Algae. III. A General Survey of Cell-Wall Structure in the Red Algae A. Myers R. D. Preston A general survey of cell-wall structure in the red algae has been carried out using the methods of X-ray...

1959-01-01T23:59:59.000Z

48

g-Factor of Heavy Ions: A New Access to the Fine Structure Constant  

SciTech Connect

A possibility for a determination of the fine structure constant in experiments on the bound-electron g-factor is examined. It is found that studying a specific difference of the g-factors of B- and H-like ions of the same spinless isotope in the Pb region to the currently accessible experimental accuracy of 7x10{sup -10} would lead to a determination of the fine structure constant to an accuracy which is better than that of the currently accepted value. Further improvements of the experimental and theoretical accuracy could provide a value of the fine structure constant which is several times more precise than the currently accepted one.

Shabaev, V.M. [Department of Physics, St. Petersburg State University, Oulianovskaya 1, Petrodvorets, St. Petersburg 198504 (Russian Federation); Gesellschaft fuer Schwerionenforschung, Planckstrasse 1, D-64291 Darmstadt (Germany); Glazov, D.A.; Oreshkina, N.S. [Department of Physics, St. Petersburg State University, Oulianovskaya 1, Petrodvorets, St. Petersburg 198504 (Russian Federation); Volotka, A.V. [Department of Physics, St. Petersburg State University, Oulianovskaya 1, Petrodvorets, St. Petersburg 198504 (Russian Federation); Institut fuer Theoretische Physik, TU Dresden, Mommsenstrasse 13, D-01062 Dresden (Germany); Plunien, G. [Institut fuer Theoretische Physik, TU Dresden, Mommsenstrasse 13, D-01062 Dresden (Germany); Kluge, H.-J.; Quint, W. [Gesellschaft fuer Schwerionenforschung, Planckstrasse 1, D-64291 Darmstadt (Germany)

2006-06-30T23:59:59.000Z

49

E-Print Network 3.0 - absorption difference spectra Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

Summary: these spectra show a large difference of the fine structure near the absorption edges of the inner atomic shells... . One of the specific feature of the...

50

The Effect of Viscosity on the Stability of Planar Vortices with Fine Structure  

Science Journals Connector (OSTI)

......Andrew P. Bassom 1 Andrew D. Gilbert 1 1 Department of Mathematical...P. BASSOM and ANDREW D. GILBERT (Department of Mathematical...address: Centre for Applied Microbiology & Research, Porton Down...A. P. Bassom and A. D. Gilbert, The effect of fine structure......

Ian M. Hall; Andrew P. Bassom; Andrew D. Gilbert

51

Fine structure of the isovector giant dipole resonance in 208Pb: Characteristic scales and level densities  

E-Print Network (OSTI)

The IVGDR in 208Pb has been measured with high energy resolution with the (p,p') reaction under extreme forward angles and shows considerable fine structure. Characteristic scales are extracted from the spectra with a wavelet analysis based on continuous wavelet transforms. Comparison with corresponding analyses of B(E1) strength distributions from microscopic model calculations in the framework of the QPM and relativistic RPA allow to identify giant resonance decay mechanisms responsible for the fine structure. The level density of 1- states can be related to local fluctuations of the cross sections in the energy region of the IVGDR. The magnitude of the fluctuations is determined by the autocorrelation function. Scales in the fine structure of the IVGDR in 208Pb are found at 80, 130, 220, 430, 640, 960 keV, and at 1.75 MeV. The values of the most prominent scales can be reasonably well reproduced by the microscopic calculations although they generally yield a smaller number of scales. In both models the major scales are already present at the one-particle one-hole level indicating Landau damping as a dominant mechanism responsible for the fine structure of the IVGDR in contrast to the isoscalar giant quadrupole resonance, where fine structure arises from the coupling to low-lying surface vibrations. The inclusion of complex configurations in the calculations changes the E1 strength distributions but the impact on the wavelet power spectra and characteristic scales is limited. The level density of 1- states is extracted in the excitation energy range 9-12.5 MeV and compared to a variety of phenomenological and microscopic models. The back-shifted Fermi gas model parameterization of Rauscher et al., Phys. Rev. C 56, 1613 (1997) describes the level-density data well, while other phenomeological and microscopic approaches fail to reproduce absolute values or the energy dependence or both.

I. Poltoratska; R. W. Fearick; A. M. Krumbholz; E. Litvinova; H. Matsubara; P. von Neumann-Cosel; V. Yu. Ponomarev; A. Richter; A. Tamii

2014-05-19T23:59:59.000Z

52

Experimental study of a structural magnesium alloy with high absorption energy under dynamic loading  

SciTech Connect

It has been demonstrated that pure Mg exhibits low ductility under dynamic loading at room temperature owing to its HCP structure. Very limited data are currently available for magnesium alloys under dynamic loading. In order to be used for structural components, it is necessary to improve the mechanical properties of magnesium alloys. Lahaise et al. reported the yield strength of the AZ91 magnesium alloy increased with refining its microstructure. Mohri et al. has already been reported the ductility enhancement of a Mg-Y-RE(Rare Earth) alloy by hot extrusion. They mentioned the enhancement of ductility is due to the refining microstructure of magnesium. Thus refining microstructure enables to raise the possibility for the development of a structural magnesium alloy with high ductility at dynamic strain rate. In this paper, the possibility of a fine-grained WE43 magnesium alloy is investigated to raise the high speed impact performance against the foreign object damage by the enhancement of ductility and absorption energy under dynamic loading.

Mukai, T.; Ishikawa, K. [Osaka Municipal Technical Research Inst. (Japan). Mechanical Engineering Dept.] [Osaka Municipal Technical Research Inst. (Japan). Mechanical Engineering Dept.; Mohri, T. [Nagoya Municipal Industrial Research Inst. Rokuban, Atsuta (Japan)] [Nagoya Municipal Industrial Research Inst. Rokuban, Atsuta (Japan); Nakamura, M. [National Industrial Research Inst., Nagoya (Japan)] [National Industrial Research Inst., Nagoya (Japan); Higashi, K. [Osaka Prefecture Univ., Sakai (Japan)] [Osaka Prefecture Univ., Sakai (Japan)

1998-10-05T23:59:59.000Z

53

Origin of fine structure of the giant dipole resonance in sd-shell nuclei  

E-Print Network (OSTI)

A set of high resolution zero-degree inelastic proton scattering data on 24Mg, 28Si, 32S, and 40Ca provides new insight into the long-standing puzzle of the origin of fragmentation of the Giant Dipole Resonance (GDR) in sd-shell nuclei. Understanding is provided by state-of-the-art theoretical Random Phase Approximation (RPA) calculatios for deformed nuclei using for the first time a realistic nucleon-nucleon interaction derived from the Argonne V18 potential with the unitary correlation operator method and supplemented by a phenomenological three-nucleon contact interaction. A wavelet analysis allows to extract significant scales both in the data and calculations characterizing the fine structure of the GDR. The fair agreement supports that the fine structure arises from ground-state deformation driven by alpha clustering.

R. W. Fearick; B. Erler; H. Matsubara; P. von Neumann-Cosel; A. Richter; R. Roth; A. Tamii

2014-09-03T23:59:59.000Z

54

X-ray Absorption Spectroscopy  

SciTech Connect

This review gives a brief description of the theory and application of X-ray absorption spectroscopy, both X-ray absorption near edge structure (XANES) and extended X-ray absorption fine structure (EXAFS), especially, pertaining to photosynthesis. The advantages and limitations of the methods are discussed. Recent advances in extended EXAFS and polarized EXAFS using oriented membranes and single crystals are explained. Developments in theory in understanding the XANES spectra are described. The application of X-ray absorption spectroscopy to the study of the Mn4Ca cluster in Photosystem II is presented.

Yano, Junko; Yachandra, Vittal K.

2009-07-09T23:59:59.000Z

55

Band structures Optical absorption Summary Key concepts in Density Functional Theory (II)  

E-Print Network (OSTI)

Band structures Optical absorption Summary Key concepts in Density Functional Theory (II) Kohn, Belfast Key concepts in Density Functional Theory (II) Silvana Botti #12;Band structures Optical in Density Functional Theory (II) Silvana Botti #12;Band structures Optical absorption Summary Outline 1 From

Botti, Silvana

56

Patterns of cell division, DNA base compositions, and fine structures of some radiation-resistant vegetative bacteria found in food.  

Science Journals Connector (OSTI)

...29. Thornley, M. J. 1963. Radiation resistance among bac- VOL...Glauert. 1968. Fine structure and radiation resistance in Acinetobacter studies...Maxcy. 1971. Impact of low doses of gamma radiation and storage of the microflora...

S W Sanders; R B Maxcy

1979-01-01T23:59:59.000Z

57

Study of microscopic structure of porous media - fine coal filter cakes  

SciTech Connect

The macroscopic properties of the porous media, e.g., permeability, capillary pressure, relative permeability, depend upon the microscopic structure of the porous medium. In the coal preparation plants, the filtration and dewatering rates of the fine coal filter cakes are important in determining the final moisture content. The microscopic structure of the porous coal filter cakes plays an important role in these operations. Moreover, the two phase flow through the porous medium can be explained in detail by considering its pore structure. Hence, the development of a technique for the micro-structural analysis of unconsolidated coal filter cakes is investigated. The technique developed is also applicable to many consolidated porous media like sandstones, rocks, etc. Optical methods were utilized to study the micro-structure of fine coal cakes. The investigation of -32 mesh Pittsburgh seam coal cakes reveals a non-uniform structure at low solid concentration of 0.33 kg coal/kg water. An increase in the solid concentration in the slurry produces a more uniform structure with an increase in the filtration and dewatering rates. It was found that coal filter cakes are incompressible over the range of 28 to 67 kPa applied vacuum. An important aspect of this work was to provide quantitative information about the presence of air bubbles in the coal filter cakes. These air bubbles are evolved from the aerated slurry and they reduce the filtration rates. A linear correlation between the particle and pore size distribution of -32 mesh Pittsburgh coal was found.

Kakwani, R.M.

1983-01-01T23:59:59.000Z

58

Observation of quartet-state fine structures and lifetimes in lithiumlike Ne VIII  

Science Journals Connector (OSTI)

Wavelength and lifetime measurements for the fine-structure components of the 1s 2s 2p Po4-1s 2p2 P4 multiplet in lithiumlike Ne VIII have been made using foil excitation of a fast-ion beam. The results are compared with recent theoretical calculations and with previous measurements for other ions of the same isoelectronic squence. An apparent discrepancy between theory and experiment for the 1s 2p2 P324 lifetime is removed.

A. E. Livingston; J. E. Hardis; L. J. Curtis; R. L. Brooks; H. G. Berry

1984-10-01T23:59:59.000Z

59

Extended X-Ray Absorption Fine Structure Studies of Actinide Ions in Aqueous Solution  

Science Journals Connector (OSTI)

Technical Paper / Argonne National Laboratory Specialists Workshop on Basic Research Needs for Nuclear Waste Management / Radioactive Waste

Douglas P. Karim; P. Georgopoulos; G. S. Knapp

60

Photoluminescence and Extended X-ray Absorption Fine Structure Studies on CdTe Material.  

E-Print Network (OSTI)

??The direct-band-gap semiconductor CdTe is an important material for fabricating high efficiency, polycrystalline thin-film solar cells in a heterojunction configuration. The outstanding physical properties of (more)

Liu, Xiangxin

2006-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "absorption fine structure" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

E-Print Network 3.0 - atomic scale structure Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

Search Powered by Explorit Topic List Advanced Search Sample search results for: atomic scale structure Page: << < 1 2 3 4 5 > >> 1 Extended Xray Absorption Fine Structure...

62

Fine and hyperfine structure of P-levels in muonic hydrogen  

E-Print Network (OSTI)

Corrections of orders $\\alpha^5$ and $\\alpha^6$ are calculated in the fine structure interval $\\Delta E^{fs}=E(2P_{3/2})-E(2P_{1/2})$ and in the hyperfine structure of the energy levels $2P_{1/2}$ and $2P_{3/2}$ in muonic hydrogen. The obtained numerical values $\\Delta E^{fs}= 8352.08 \\mu eV$, $\\Delta \\tilde E^{hfs}(2P_{1/2})=7964.36 \\mu eV$, $\\Delta \\tilde E^{hfs}(2P_{3/2})=3392.59 \\mu eV$ can be considered as a reliable estimate for the comparison with corresponding experimental data and for the extraction of the experimental value of the Lamb shift $(2P-2S)$ in muonic hydrogen.

A. P. Martynenko

2006-10-25T23:59:59.000Z

63

Highly charged ions for atomic clocks and search for variation of the fine structure constant  

E-Print Network (OSTI)

We review a number of highly charged ions which have optical transitions suitable for building extremely accurate atomic clocks. This includes ions from Hf$^{12+}$ to U$^{34+}$, which have the $4f^{12}$ configuration of valence electrons, the Ir$^{17+}$ ion, which has a hole in almost filled $4f$ subshell, the Ho$^{14+}$, Cf$^{15+}$, Es$^{17+}$ and Es$^{16+}$ ions. Clock transitions in most of these ions are sensitive to variation of the fine structure constant, $\\alpha$ ($\\alpha = e^2/\\hbar c$). E.g., californium and einsteinium ions have largest known sensitivity to $\\alpha$-variation while holmium ion looks as the most suitable ion for experimental study. We study the spectra of the ions and their features relevant to the use as frequency standards.

Dzuba, V A

2015-01-01T23:59:59.000Z

64

The variation of the fine structure constant: testing the dipole model with thermonuclear supernovae  

E-Print Network (OSTI)

The large-number hypothesis conjectures that fundamental constants may vary. Accordingly, the spacetime variation of fundamental constants has been an active subject of research for decades. Recently, using data obtained with large telescopes a phenomenological model in which the fine structure constant might vary spatially has been proposed. We test whether this hypothetical spatial variation of {\\alpha}, which follows a dipole law, is compatible with the data of distant thermonuclear supernovae. Unlike previous works, in our calculations we consider not only the variation of the luminosity distance when a varying {\\alpha} is adopted, but we also take into account the variation of the peak luminosity of Type Ia supernovae resulting from a variation of {\\alpha}. This is done using an empirical relation for the peak bolometric magnitude of thermonuclear supernovae that correctly reproduces the results of detailed numerical simulations. We find that there is no significant difference between the several phenome...

Kraiselburd, Lucila; Negrelli, Carolina; Berro, Enrique Garca

2014-01-01T23:59:59.000Z

65

Structural analysis of sulfur in natural rubber using X-ray absorption near-edge spectroscopy  

Science Journals Connector (OSTI)

The opportunity to employ X-ray absorption near-edge spectroscopy techniques to investigate the alteration of the structural properties of sulfur in various vulcanized rubber sheets is presented.

Pattanasiriwisawa, W.

2008-07-11T23:59:59.000Z

66

Solving the structure of reaction intermediates by time-resolved synchrotron x-ray absorption spectroscopy  

E-Print Network (OSTI)

metal oxides CuO,1 Cu-ceria,2 Au-ceria,3 and Cu­MoO2 Ref. 4 in water-gas- shift reactions. Another area catalysts where we detected reaction intermediates and measured fine details of the reaction kinetics and 12 have been also applied to study intermediate state structure and deter- mine reaction kinetic

Frenkel, Anatoly

67

Theory for optical absorption in small clusters: Dependence on atomic surface structure and cluster size  

Science Journals Connector (OSTI)

We present a theory which permits for the first time a detailed analysis of the dependence of the absorption spectrum on atomic structure and cluster size. Thus, we determine the development of the collective excitations in small clusters and show that their broadening depends sensitively on the atomic structure, in particular at the surface. Results for Hgn+ clusters show that the plasmon energy is close to its jellium value in the case of spherical-like structures, but is in general between ?p/ ?3 and ?p/ ?2 for compact clusters. A particular success of our theory is the identification of the excitations contributing to the absorption peaks.

S. Grabowski, M. E. Garcia, and K. H. Bennemann

1994-06-20T23:59:59.000Z

68

X-ray absorption anisotropy for polychromatic illumination--Crystal views from inside  

E-Print Network (OSTI)

X-ray absorption anisotropy for polychromatic illumination--Crystal views from inside P. Korecki a Keywords: X-ray absorption Real-space imaging X-ray holography Electron channeling Electron backscatter of the fine structure in X-ray absorption anisotropy, which results from incident beam diffraction

Korecki, Pawe³

69

Bohr - Planck quantum theory, (Tesla) magnetic monopoles and fine structure constant  

E-Print Network (OSTI)

In this work we apply Bohr-Planck (Old quantum atomic and radiation) theory, i.e. and quasi-classical methods for analysis of the magnetic monopoles and other problems. We reproduce exactly some basic elements of the Dirac magnetic monopoles theory, especially Dirac electric/magnetic charge quantization condition. Also, we suggest a new, effective, simply called Tesla model (for analogy with positions of the solenoids by Tesla inductive motor) of the magnetic monopole instead of usual effective Dirac model (half-infinite, very tinny solenoid) of the magnetic monopole. In our, i.e. Tesla model we use three equivalent tiny solenoids connected in series with a voltage source. One end of any solenoid is placed at the circumference of a circle and solenoids are directed radial toward circle center. Length of any solenoid is a bit smaller than finite circle radius so that other end of any solenoid is very close to the circle center. Angles between neighboring solenoids equal $120^{\\circ}$. All this implies that, practically, there is no magnetic field, or, magnetic pole, e.g. $S$, in the circle center, and that whole system holds only other, $N$ magnetic pole, at the ends of the solenoids at circle circumference. Finally, we reproduce relatively satisfactory value of the fine structure constant using Planck, i.e. Bose-Einstein statistics and Wien displacement law.

Vladan Pankovic; Darko V. Kapor; Stevica Djurovic; Miodrag Krmar

2014-10-17T23:59:59.000Z

70

Defects in Divided Zinc?Copper Aluminate Spinels:? Structural Features and Optical Absorption Properties  

Science Journals Connector (OSTI)

Defects in Divided Zinc?Copper Aluminate Spinels:? Structural Features and Optical Absorption Properties ... XRD-powder data refinements (Rietveld method) have demonstrated that both compound series crystallize in the spinel structure (Fd3?m) and exhibit similar inversion rates. ... 8 This is the case of CuAlO2 composition adopting the delafossite-type structure9and which can be considered as a p-type transparent conductive oxide (TCO). ...

Anne Le Nestour; Manuel Gaudon; Grard Villeneuve; Marco Daturi; Ronn Andriessen; Alain Demourgues

2007-04-07T23:59:59.000Z

71

X-ray absorption studies of the local structure and f-level occupancy in CeIr(1-x)Rh(x)In(5)  

SciTech Connect

The CeIr{sub 1-x}Rh{sub x}In{sub 5} series exhibits a range of interesting phenomena, including heavy-fermion superconductivity, non-Fermi liquid behavior, and concomitant antiferromagnetism (AF) and superconductivity (SC). In the low-Rh concentration range (0.1 {ge} x {ge} 0.5), specific heat measurements show a broad anomaly, suggestive of gross phase separation. We have performed x-ray absorption experiments at the Ce L{sub III}, Ir L{sub III}, and Rh K-edges as a function of Rh concentration and temperature. X-ray absorption near-edge structure (XANES) measurements indicate that cerium is close to trivalent in this system, with no measurable change with temperature from 20-300 K, consistent with a heavy-fermion material. Extended x-ray absorption fine structure (EXAFS) measurements as a function of temperature from all measured edges indicate the local crystal structure of all samples is well ordered, with no gross phase separation observed, even for samples with x = 0.125 and x = 0.25. These results therefore suggest that the anomalous specific heat behavior in the 0.1 {ge} x {ge} 0.5 range have some other explanation, and some possibilities are discussed.

Daniel, M.; Han, S.-W.; Booth, C.H.; Cornelius, A.L.; Pagliuso, P.G.; Sarrao, J.L.; Thompson, J.D.

2004-04-15T23:59:59.000Z

72

Atomic structure of machined semiconducting chips: An x-ray absorption spectroscopy study  

SciTech Connect

X-ray absorption spectroscopy (XAS) has been used to examine the atomic structure of chips of germanium that were produced by single point diamond machining. It is demonstrated that although the local (nearest neighbor) atomic structure is experimentally quite similar to that of single crystal specimens information from more distant atoms indicates the presence of considerable stress. An outline of the technique is given and the strength of XAS in studying the machining process is demonstrated.

Paesler, M.; Sayers, D.

1988-12-01T23:59:59.000Z

73

FAR-INFRARED FINE-STRUCTURE LINE DIAGNOSTICS OF ULTRALUMINOUS INFRARED GALAXIES  

SciTech Connect

We present Herschel observations of 6 fine-structure lines in 25 ultraluminous infrared galaxies at z < 0.27. The lines, [O III]52 ?m, [N III]57 ?m, [O I]63 ?m, [N II]122 ?m, [O I]145 ?m, and [C II]158 ?m, are mostly single Gaussians with widths <600 km s{sup 1} and luminosities of 10{sup 7}-10{sup 9} L{sub ?}. There are deficits in the [O I]63/L{sub IR}, [N II]/L{sub IR}, [O I]145/L{sub IR}, and [C II]/L{sub IR} ratios compared to lower luminosity systems. The majority of the line deficits are consistent with dustier H II regions, but part of the [C II] deficit may arise from an additional mechanism, plausibly charged dust grains. This is consistent with some of the [C II] originating from photodissociation regions or the interstellar medium (ISM). We derive relations between far-IR line luminosities and both the IR luminosity and star formation rate. We find that [N II] and both [O I] lines are good tracers of the IR luminosity and star formation rate. In contrast, [C II] is a poor tracer of the IR luminosity and star formation rate, and does not improve as a tracer of either quantity if the [C II] deficit is accounted for. The continuum luminosity densities also correlate with the IR luminosity and star formation rate. We derive ranges for the gas density and ultraviolet radiation intensity of 10{sup 1} < n < 10{sup 2.5} and 10{sup 2.2} < G{sub 0} < 10{sup 3.6}, respectively. These ranges depend on optical type, the importance of star formation, and merger stage. We do not find relationships between far-IR line properties and several other parameters: active galactic nucleus (AGN) activity, merger stage, mid-IR excitation, and SMBH mass. We conclude that these far-IR lines arise from gas heated by starlight, and that they are not strongly influenced by AGN activity.

Farrah, D.; Petty, S. M.; Harris, K. [Department of Physics, Virginia Tech, Blacksburg, VA 24061 (United States); Lebouteiller, V.; Spoon, H. W. W. [Cornell University, CRSR, Space Sciences Building, Ithaca, NY 14853 (United States); Bernard-Salas, J.; Pearson, C. [Department of Physics and Astronomy, The Open University, Milton Keynes MK7 6AA (United Kingdom); Rigopoulou, D. [RAL Space, Rutherford Appleton Laboratory, Harwell, Oxford OX11 0QX (United Kingdom); Smith, H. A. [Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States); Gonzlez-Alfonso, E. [Universidad de Alcal, Departamento de Fsica y Matemticas, Campus Universitario, E-28871 Alcal de Henares, Madrid (Spain); Clements, D. L. [Physics Department, Imperial College London, Prince Consort Road, London SW7 2AZ (United Kingdom); Efstathiou, A. [School of Sciences, European University Cyprus, Diogenes Street, Engomi, 1516 Nicosia (Cyprus); Cormier, D. [Institut fr theoretische Astrophysik, Zentrum fr Astronomie der Universitt Heidelberg, Albert-Ueberle Str. 2, D-69120 Heidelberg (Germany); Afonso, J. [Centro de Astronomia e Astrofsica da Universidade de Lisboa, Observatrio Astronmico de Lisboa, Tapada da Ajuda, 1349-018 Lisbon (Portugal); Hurley, P. [Department of Physics and Astronomy, University of Sussex, Falmer, Brighton BN1 9QH (United Kingdom); Borys, C. [Infrared Processing and Analysis Center, MS220-6, California Institute of Technology, Pasadena, CA 91125 (United States); Verma, A. [Oxford Astrophysics, Denys Wilkinson Building, University of Oxford, Keble Rd, Oxford OX1 3RH (United Kingdom); Cooray, A.; Salvatelli, V. [Department of Physics and Astronomy, University of California, Irvine, CA 92697 (United States)

2013-10-10T23:59:59.000Z

74

Quantum-electrodynamic model of the finite-size electron and calculation of the fine-structure constant  

E-Print Network (OSTI)

We propose a model of a relativistic string formed by a scalar complex field, acting as electromagnetic field source. An axiosymmetric solutions of the stationary equations for the scalar and electromagnetic fields are found numerically. The mass $m$ is calculated as a function of the charge $e$ and the magnetic moment $\\mu$ of the system. The resulting toroidal structure is interpreted as an electron because the calculated ratio $e^3/(2mc^2\\mu)$ coincides with the fine-structure constant $\\alpha=e^2/(\\hbar c)\\approx e^3/(2m_ec^2\\mu_e)$.

E. P. Likhtman

2006-11-05T23:59:59.000Z

75

Solar abundances and helioseismology: fine structure spacings and separation ratios of low-degree p modes  

E-Print Network (OSTI)

We have used 4752 days of data collected by the Birmingham Solar-Oscillations Network (BiSON) to determine very precise oscillation frequencies of acoustic low-degree modes that probe the solar core. We compare the fine (small frequency) spacings and frequency separation ratios formed from these data with those of different solar models. We find that models constructed with low metallicity are incompatible with the observations. The results provide strong support for lowering the theoretical uncertainties on the neutrino fluxes. These uncertainties had recently been raised due to the controversy over the solar abundances.

Sarbani Basu; William J. Chaplin; Yvonne Elsworth; Roger New; Aldo M. Serenelli; Graham A. Verner

2006-10-02T23:59:59.000Z

76

Electron affinity of arsenic and the fine structure of As{sup -} measured using infrared photodetachment threshold spectroscopy  

SciTech Connect

The binding energy and fine-structure splittings of the arsenic negative ion (As{sup -}) have been measured using infrared photodetachment threshold spectroscopy. The relative cross section for neutral atom production was measured with a crossed ion-beam-laser-beam apparatus over selected photon energy ranges between 630-810 meV. An s-wave threshold was observed due to the opening of the As{sup -}(4p{sup 4} {sup 3}P{sub 2}) to As(4p{sup 3} {sup 4}S{sub 3/2}) ground-state to ground-state transition, which yields the electron affinity of As to be 804.8(2) meV. s-wave thresholds were also observed for detachment from the J=1 and J=0 excited levels of As{sup -}, permitting accurate determination of the fine-structure splittings of 127.6(2) meV for {sup 3}P{sub 1}-{sup 3}P{sub 2} and 164.3(10) meV for {sup 3}P{sub 0}-{sup 3}P{sub 2}. The present values are consistent with previous measurements and substantially reduce the uncertainties.

Walter, C. W.; Gibson, N. D.; Field, R. L. III; Snedden, A. P.; Shapiro, J. Z.; Janczak, C. M.; Hanstorp, D. [Department of Physics and Astronomy, Denison University, Granville, Ohio 43023 (United States); Department of Physics, University of Gothenburg, SE-412 96 Gothenburg (Sweden)

2009-07-15T23:59:59.000Z

77

Strong enhancement of light absorption and highly directive thermal emission in graphene  

E-Print Network (OSTI)

Strong enhancement of light absorption and highly directive thermal emission in graphene Mingbo Pu: Graphene is a two-dimensional material with exotic electronic, optical and thermal properties. The optical absorption in monolayer graphene is limited by the fine structure constant . Here we demonstrated the strong

Chen, Po

78

E-Print Network 3.0 - anomalous fine structure Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

structure derives micr PDF f elementary cell (with... 2005 Understanding anomalous transport intermittent maps: From ... Source: Klages, Rainer - School of Mathematical...

79

The vibrational and rotational structure of the 2400 to 1950 A? absorption spectrum of sulfur dioxide  

E-Print Network (OSTI)

0. $ ? Vs TBE YiaUSXOKtf U ? m sm U M A L M W of thb 2400 to 1950 2 Ammwim mmmm m s u m m m a m A. BisMrtatiim % James Willbom Biggs, Jfe. Submitted to the Gra4taata Sdtotd tdt HA* Agricultural and Maofcudoal Qtlltc* %ff I'M* 3*i partial... fulfillment of' %hm r*tuir??Mi*s f?r %ift ??' m m m m m m & m s t Major Sttfejoott Rupeio* THE VIBRATIONAL AND ROTATIONAL STRUCTURE OP THE 2400 TO 1950 A ABSORPTION SPECTRUM OP SULFUR DIOXIDE A Dissertation 37 James Willborn Riggs, Jr. Approved...

Riggs, James Willborn

2013-10-04T23:59:59.000Z

80

Optical Absorption, Stability and Structure of NpO2+ Complexeswith Dicarboxylic Acids  

SciTech Connect

Complexation of NpO2+ with oxalic acid (OX),2,2'-oxydiacetic acid (ODA), 2,2'-iminodiacetic acid (IDA) and 2,2'-thiodiacetic acid (TDA), has been studied using spectrophotometry in1 M NaClO4. Both the position and the intensity of the absorption band of NpO2+ at 980 nm are affected by the formation of NpO2+/dicarboxylate complexes, providing useful information on the complexation strength, the coordination mode and the structure of the complexes.

Guoxin Tian; Linfeng Rao

2006-01-04T23:59:59.000Z

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81

Dual structure of saturated absorption resonance at an open atomic transition  

SciTech Connect

Experiments on open transitions of the D{sub 1} line of alkali metals (Cs and Rb isotopes) reveal the dual structure of saturated absorption resonance in the signal of a high-intensity optical wave in the presence of a low-intensity counterpropagating wave. Theoretical analysis shows that the observed shape of the resonance is associated with the openness of the atomic transition as well as with the Doppler effect for atoms in a gas. The results are of general physical significance for nonlinear spectroscopy and can also find application in metrology (frequency and time standards on open transitions).

Vasil'ev, V. V., E-mail: vlvlab@okb.lpi.troitsk.ru; Velichanskii, V. L., E-mail: vlvlab@okb.lpi.troitsk.ru; Zibrov, S. A., E-mail: vlvlab@okb.lpi.troitsk.ru [Russian Academy of Sciences, Lebedev Physical Institute (Russian Federation); Sivak, A. V., E-mail: vlvlab@okb.lpi.troitsk.ru [National Research Nuclear University (Moscow Institute of Engineering Physics) (Russian Federation); Brazhnikov, D. V., E-mail: LLF@laser.nsc.ru; Taichenachev, A. V., E-mail: LLF@laser.nsc.ru; Yudin, V. I., E-mail: LLF@laser.nsc.ru [Russian Academy of Sciences, Institute of Laser Physics, Siberian Branch (Russian Federation)

2011-05-15T23:59:59.000Z

82

On the importance of nuclear quantum motions in near edge x-ray absorption fine structure (NEXAFS) spectroscopy of molecules  

SciTech Connect

We report the effects of sampling nuclear quantum motion with path integral molecular dynamics (PIMD) on calculations of the nitrogen K-edge spectra of two isolated organic molecules. S-triazine, a prototypical aromatic molecule occupying primarily its vibrational ground state at room temperature, exhibits substantially improved spectral agreement when nuclear quantum effects are included via PIMD, as compared to the spectra obtained from either a single fixed-nuclei based calculation or from a series of configurations extracted from a classical molecular dynamics trajectory. Nuclear quantum dynamics can accurately explain the intrinsic broadening of certain features. Glycine, the simplest amino acid, is problematic due to large spectral variations associated with multiple energetically accessible conformations at the experimental temperature. This work highlights the sensitivity of NEXAFS to quantum nuclear motions in molecules, and the necessity of accurately sampling such quantum motion when simulating their NEXAFS spectra.

Schwartz, Craig P.; Uejio, Janel S.; Saykally, Richard J.; Prendergast, David

2009-02-26T23:59:59.000Z

83

Nanostructured Tin-Based Anodes for Lithium Ion Batteries with X-Ray Absorption Fine Structure Studies.  

E-Print Network (OSTI)

??The practical applications of lithium ion batteries are highly dependent on the choice of electrodes, where boosting the materials innovations to design and achieve high (more)

Wang, Dongniu

2013-01-01T23:59:59.000Z

84

Influence of 8-Oxoguanosine on the Fine Structure of DNA Studied with Biasing-Potential Replica Exchange Simulations  

SciTech Connect

Chemical modification or radiation can cause DNA damage, which plays a crucial role for mutagenesis of DNA, carcinogenesis, and aging. DNA damage can also alter the fine structure of DNA that may serve as a recognition signal for DNA repair enzymes. A new, advanced sampling replica-exchange method has been developed to specifically enhance the sampling of conformational substates in duplex DNA during molecular dynamics (MD) simulations. The approach employs specific biasing potentials acting on pairs of pseudodihedral angles of the nucleic acid backbone that are added in the replica simulations to promote transitions of the most common substates of the DNA backbone. The sampled states can exchange with a reference simulation under the control of the original force field. The application to 7,8-dihydro-8oxo-guanosine, one of the most common oxidative damage in DNA indicated better convergence of sampled states during 10 ns simulations compared to 20 times longer standard MD simulations. It is well suited to study systematically the fine structure and dynamics of large nucleic acids under realistic conditions, including explicit solvent and ions. The biasing potential-replica exchange MD simulations indicated significant differences in the population of nucleic acid backbone substates in the case of 7,8-dihydro-8oxo-guanosine compared to a regular guanosine in the same sequence context. This concerns both the ratio of the B-DNA substates BI and BII associated with the backbone dihedral angles ? and z but also coupled changes in the backbone dihedral angles a and g. Such differences may play a crucial role in the initial recognition of damaged DNA by repair enzymes.

Kara, Mahmut; Zacharias, Martin W.

2013-03-05T23:59:59.000Z

85

Fine-scale structures and material flows of quiescent filaments observed by New Vacuum Solar Telescope  

E-Print Network (OSTI)

Study on the small-scale structures and material flows of solar quiescent filaments is very important for understanding the formation and equilibrium of solar filaments. Using the high resolution H{\\alpha} data observed by the New Vacuum Solar Telescope (NVST), we present the structures of the barbs and the material flows along the threads across the spine in two quiescent filaments on 2013 September 29 and on 2012 November 2, respectively. During the evolution of the filament barb, several parallel tube-shaped structures formed and the width of the structures ranges from about 2.3 Mm to 3.3 Mm. The parallel tube-shaped structures merged together accompanied with the material flows from the spine to the barb. Moreover, the boundary between the barb and surrounding atmosphere is very neat. The counter-streaming flows were not found to appear alternately in the adjacent threads of the filament. However, the large-scale patchy counter-streaming flows are detected in the filament. The flows in one patch of the fi...

Yan, X L; Xiang, Y Y; Yang, L H

2015-01-01T23:59:59.000Z

86

Some Spectroscopic Properties of Fine Structures Observed near the Pa231(n,f) Fission Threshold  

Science Journals Connector (OSTI)

The Pa231 neutron-induced fission cross section from 140 to 400 keV was resolved into finer structures. For some of the fractionated vibrational resonances in this energy region, the assignment of spectroscopic parameters may support evidence for an asymmetrically deformed third minimum in the Pa232 fission barrier. Also, for the first time, narrow fission resonances are observed above 1.3 eV exhibiting an average fission width ??f?ob s=8 ?eV.

S. Plattard; G. F. Auchampaugh; N. W. Hill; G. de Saussure; J. A. Harvey; R. B. Perez

1981-03-09T23:59:59.000Z

87

Unresolved fine-scale structure in solar coronal loop-tops  

E-Print Network (OSTI)

New and advanced space-based observing facilities continue to lower the resolution limit and detect solar coronal loops in greater detail. We continue to discover even finer sub-structures within coronal loop cross sections, in order to understand the nature of the solar corona. Here, we push this lower limit further to search for the finest coronal loop sub-structures, through taking advantage of the resolving power of the Swedish 1- m Solar Telescope (SST) / CRisp Imaging Spectro-Polarimeter (CRISP), together with co-observations from the Solar Dynamics Observatory (SDO) / Atmospheric Image Assembly (AIA). High resolution imaging of the chromospheric H-alpha 656.28 nm spectral line core and wings can, under certain circumstances, allow one to deduce the topology of the local magnetic environment of the solar atmosphere where its observed. Here, we study post-flare coronal loops, which become filled with evaporated chromosphere that rapidly condenses into chromospheric clumps of plasma (detectable in H-alpha...

Scullion, Eamon; Wedemeyer, Sven; Antolin, Patrick

2014-01-01T23:59:59.000Z

88

The Unresolved Fine Structure Resolved - IRIS observations of the Solar Transition Region  

E-Print Network (OSTI)

The heating of the outer solar atmospheric layers, i.e., the transition region and corona, to high temperatures is a long standing problem in solar (and stellar) physics. Solutions have been hampered by an incomplete understanding of the magnetically controlled structure of these regions. The high spatial and temporal resolution observations with the Interface Region Imaging Spectrograph (IRIS) at the solar limb reveal a plethora of short, low lying loops or loop segments at transition-region temperatures that vary rapidly, on the timescales of minutes. We argue that the existence of these loops solves a long standing observational mystery. At the same time, based on comparison with numerical models, this detection sheds light on a critical piece of the coronal heating puzzle.

Hansteen, V; Carlsson, M; Lemen, J; Title, A; Boerner, P; Hurlburt, N; Tarbell, T D; Wuelser, J P; Pereira, T M D; De Luca, E E; Golub, L; McKillop, S; Reeves, K; Saar, S; Testa, P; Tian, H; Kankelborg, C; Jaeggli, S; Kleint, L; Martinez-Sykora, J

2014-01-01T23:59:59.000Z

89

Projections of local atomic structure revealed by wavelet analysis of x-ray absorption anisotropy P. Korecki,1,* D. V. Novikov,2 and M. Tolkiehn2  

E-Print Network (OSTI)

Projections of local atomic structure revealed by wavelet analysis of x-ray absorption anisotropy P x-ray field amplitude at the sites of absorbing atoms and effectively changes the atomic absorption in an experiment a wavelet transform approach for analysis of x-ray absorption anisotropy XAA patterns recorded

Korecki, Pawe³

90

Multiple-scattering calculations of the uranium {ital L}{sub 3}-edge x-ray-absorption near-edge structure  

SciTech Connect

A theoretical study of the uranium {ital L}{sub 3}-edge x-ray absorption near-edge structure (XANES) is presented for several uranium compounds, including oxides, intermetallics, uranyl fluoride, and {alpha}-uranium. Calculations were performed using FEFF6, an {ital ab} {ital initio} multiple-scattering (MS) code that includes the most important features of current theories. The results, which account for both the fine structure {chi} and the atomiclike background {mu}{sub 0} of the absorption coefficient {mu}, are compared to new and previously measured experimental spectra, reavealing very good agreement for most systems. For several compounds, a more detailed theoretical analysis determined the influence of cluster size and scattering order upon the calculated spectra. Results indicate that MS paths and scattering paths that include rather distant atoms make significant contributions for UO{sub 2}, whereas XANES for crystals with lower symmetry and density can be modeled using only shorter single-scattering paths. In most cases, assumption of a screened final state in the calculation gives better agreement with experiment than use of an unscreened final state. The successful modeling of spectra for a variety of different uranium compounds, with differing spectral features, indicates that the semirelativistic treatment of XANES used here is adequate even for heavy elements. The well-known resonance, observed experimentally for uranyl (UO{sub 2}{sup 2+}) compounds {approx}15 eV above the white line, is successfully modeled here for the first time, using multiple-scattering paths within the O-U-O axial bonds. Overlapping muffin-tin spheres were required in the calculation, probably as a result of the short uranyl axial bonds.

Hudson, E.A. [Glenn T. Seaborg Institute for Transactinium Science, Lawrence Livermore National Laboratory, University of California, Livermore, California 94551 (United States)] [Glenn T. Seaborg Institute for Transactinium Science, Lawrence Livermore National Laboratory, University of California, Livermore, California 94551 (United States); Rehr, J.J. [Department of Physics, University of Washington, Seattle, Washington 98195 (United States)] [Department of Physics, University of Washington, Seattle, Washington 98195 (United States); Bucher, J.J. [Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)] [Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)

1995-11-15T23:59:59.000Z

91

Excitonic fine-structure splitting in telecom-wavelength InAs/GaAs quantum dots: Statistical distribution and height-dependence  

SciTech Connect

The variation of the excitonic fine-structure splitting is studied for semiconductor quantum dots under the influence of a strain-reducing layer, utilized to shift the emission wavelength of the excitonic transition into the telecom-wavelength regime of 1.31.5 ?m. By means of a sp{sup 3}s{sup *}-tight-binding model and configuration interaction, we calculate wavelength shifts and fine-structure splittings for various quantum dot geometries. We find the splittings remaining small and even decreasing with strain-reducing layer composition for quantum dots with large height. Combined with an observed increased emission efficiency, the applicability for generation of entanglement photons is persistent.

Goldmann, Elias, E-mail: goldmann@itp.uni-bremen.de; Barthel, Stefan; Florian, Matthias; Jahnke, Frank [Institute of Theoretical Physics, University of Bremen, Otto-Hahn-Allee 1, 28359 Bremen (Germany)] [Institute of Theoretical Physics, University of Bremen, Otto-Hahn-Allee 1, 28359 Bremen (Germany); Schuh, Kolja [College of Optical Sciences, University of Arizona, 1630 E. University Blvd., Tucson, Arizona 85721-0094 (United States)] [College of Optical Sciences, University of Arizona, 1630 E. University Blvd., Tucson, Arizona 85721-0094 (United States)

2013-12-09T23:59:59.000Z

92

Fine Particles in Soils  

NLE Websites -- All DOE Office Websites (Extended Search)

Fine Particles in Soils Fine Particles in Soils Nature Bulletin No. 582 November 28, 1959 Forest Preserve District of Cook County Daniel Ryan, President Roberts Mann, Conservation Editor David H. Thompson, Senior Naturalist FINE PARTICLES IN SOILS If a farmer, while plowing, is visited in the field by another farmer, invariably the visitor will pick up a handful of turned over earth and knead it with his fingers while they talk. The "feel" of it tells him a lot about the texture and structure of that soil. He knows that both are important factors in the growth of plants and determine the crops that may be obtained from the land. Soil is a combination of three different things About half of it is solid matter; the other half consists of air and water The solid portion is composed of organic and inorganic materials.

93

SMB, X-ray Absorption Spectroscopy  

NLE Websites -- All DOE Office Websites (Extended Search)

Absorption Spectroscopy X-ray Absorption Spectroscopy X-ray absorption spectroscopy (XAS) is a well-established technique for simultaneous local geometric and electronic structure...

94

Absorption, structural, and electrical properties of Ge films prepared by ion-beam-assisted deposition  

Science Journals Connector (OSTI)

Effects of ion energy on the optical, microstructure, and electrical properties of Ge films prepared by ion-beam-assisted deposition were investigated. The absorption edge is found to...

Leng, Jian; Zhao, Li; Ji, Yiqin; Liu, Huasong; Zhuang, Kewen

2014-01-01T23:59:59.000Z

95

Magnetic K-edge absorption in 3d elements and its relation to local magnetic structure  

Science Journals Connector (OSTI)

In this paper we present a selection of circular magnetic x-ray dichroism (CMXD) measurements at the K edges of Fe, Ni, Co, and Mn in various alloys and compounds. We investigate the correlation between the measured spin-dependent absorption signal and the p-like spin polarization of the unoccupied bands at the Fermi level. In the case of Fe we find a direct correlation of the spin-dependent absorption profile to the p-like spin polarizations. This is discussed for various alloys. The measured CMXD signals are compared with theoretical calculations for the absorption spectra. For Fe and Ni we have performed spin-polarized relativistic Korringa-Kohn-Rostoker Greens function calculations, which give a parameter-free description of the spin-dependent absorption process. The content of information in the experimental CMXD spectra on the local magnetic p and d moments is discussed in comparison with the calculated changes of the p and d moments. In the case of the Co and Ni K edges we find a direct correlation of the average strength of the spin-dependent absorption signal to the p moment. For Co also a direct correlation to the d moment is indicated. At Fe K edges no proportionality of any features of the spin-dependent absorption profile to p or d moments have been found.

S. Sthler, G. Schtz, and H. Ebert

1993-01-01T23:59:59.000Z

96

X-ray absorption spectroscopy  

E-Print Network (OSTI)

009-9473-8 REVIEW X-ray absorption spectroscopy Junko Yano and application of X-ray absorption spectroscopy, bothX-ray absorption near-edge structure (XANES) and extended X-

Yano, Junko; Yachandra, Vittal K.

2009-01-01T23:59:59.000Z

97

Does complex absorption behavior leading to conditioning and damage in KDP/DKDP reflect the electronic structure of initiators?  

SciTech Connect

Currently, most of our thinking about the defects responsible for initiating laser damage considers them as featureless absorbers. However, an increasing body of evidence, particularly involving multi-wavelength irradiation, suggests electronic structure of damage initiators is important in determining both initiation and conditioning behaviors in KDP. The effective absorption coefficient of energy under multi-wavelength irradiation cannot be accounted for by a structureless absorber, but is consistent with an initiator with a multi-level structure. We outline the evidence and assess the ability of such a simple multi-level model to explain these and other experimentally observed behaviors.

Feit, M D; DeMange, P P; Negres, R A; Rubenchik, A M; Demos, S G

2007-10-24T23:59:59.000Z

98

X-ray-absorption spectroscopy investigation of the martensitic structural transformation in the RCu (R=rare earth) series  

Science Journals Connector (OSTI)

We present an x-ray-absorption spectroscopy (XAS) investigation performed at the L1,3 edges of the rare earth Y K edge and K and L2,3 edges of copper in several R-Cu intermetallic compounds: RCu (R=Y,Gd,Tb), Y1-xTbxCu, and Y1-xTbxCuyAg1-y. XAS spectra at the different absorption edges evidence the apparition of a strong electronic perturbation in the systems after the martensitic transformation. The dynamics of the structural transformation is discussed in terms of the interplay between the modification of both d-band widening and s-d transfer pressure.

Jess Chaboy and M. R. Ibarra

1995-08-01T23:59:59.000Z

99

E-Print Network 3.0 - atomic absorption determination Sample...  

NLE Websites -- All DOE Office Websites (Extended Search)

Search Powered by Explorit Topic List Advanced Search Sample search results for: atomic absorption determination Page: << < 1 2 3 4 5 > >> 1 Extended Xray Absorption Fine...

100

SeD Radical: A probe for measurement of time variation of Fine Structure Constant($\\alpha$) and Proton to Electron Mass Ratio($\\mu$)  

E-Print Network (OSTI)

Based on the spectroscopic constants derived from highly accurate potential energy surfaces, the SeD radical is identified as a spectroscopic probe for measuring spatial and temporal variation of fundamental physical constants such as the fine-structure constant (denoted as $\\alpha=\\frac{e^2}{\\hbar c}$) and the proton-to-electron mass ratio (denoted as $\\mu=\\frac{m_p}{m_e}$). The ground state of SeD ($X^2\\Pi$), due to spin-orbit coupling, splits into two fine structure multiplets $^2\\Pi_{\\frac{3}{2}}$ and $^2\\Pi_{\\frac{1}{2}}$. The potential energy surfaces of these spin-orbit components are derived from a state of the art electronic structure method, MRCI+Q inclusive of scalar relativistic effects with the spin-orbit effects accounted through the Breit-Pauli operator. The relevant spectroscopic data are evaluated using Murrel-Sorbie fit to the potential energy surfaces. The spin-orbit splitting($\\omega_f$) between the two multiplets is similar in magnitude with the harmonic frequency ($\\omega_e$) of the diat...

Ganguly, Gaurab; Mukherjee, Manas; Paul, Ankan

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "absorption fine structure" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

Light-induced polarization effects in atoms with partially resolved hyperfine structure and applications to absorption, fluorescence, and nonlinear magneto-optical rotation  

E-Print Network (OSTI)

Light-induced polarization effects in atoms with partially resolved hyperfine structure and applications to absorption, fluorescence, and nonlinear magneto-optical rotation M. Auzinsh* Department 9 November 2009 The creation and detection of atomic polarization is examined theoretically through

Auzinsh, Marcis

102

Sensitivity of absorption spectra to surface segregation in InGaN/GaN quantum well structures  

SciTech Connect

We investigate the influence of the indium surface segregation on absorption spectra in InGaN/GaN quantum well structures having different indium amount. Results of the mathematical modeling show that such influence is more pronounced in quantum well structures with high indium amounts. The origin of this effect is related to the interplay between the indium surface segregation and internal electrostatic fields. Our theoretical analysis is performed using semiconductor Bloch equations within the Hartree-Fock approximation including into consideration excitonic effects. Results of the global sensitivity analysis evidence that the influence of the indium surface segregation is less than one order of magnitude in comparison with the impact of the quantum-well width and indium molar fraction. Also, the influence of the indium surface segregation is not the same for each interface of the quantum well.

Klymenko, M. V.; Shulika, O. V. [Lab. Photonics, Kharkov National University of Radio Electronics, Kharkov, 61166 (Ukraine); Sukhoivanov, I. A. [Department of Electronics, Engineering Division, University of Guanajuato, Salamanca, Guanajuato, 36885 (Mexico)

2014-05-15T23:59:59.000Z

103

A microsecond time resolved x-ray absorption near edge structure synchrotron study of phase transitions in Fe undergoing ramp heating at high pressure  

SciTech Connect

We report a microsecond time-resolved x-ray absorption near edge structure study using synchrotron radiation to dynamically detect structural phase transitions in Fe undergoing rapid heating along a quasi-isochoric path. Within a few ms, we observed two structural phase transitions, which transform the ambient bcc phase of Fe into the fcc phase, and then into the liquid phase. This example illustrates the opportunities offered by energy dispersive x-ray absorption spectroscopy in the study of matter under extreme dynamic conditions. Advanced simulations are compared to these data.

Marini, C.; Mathon, O.; Pascarelli, S. [European Synchrotron Radiation Facility, 6 Rue Jules Horowitz, BP220, 38043 Grenoble Cedex (France); Occelli, F.; Torchio, R.; Recoules, V.; Loubeyre, P. [CEA, Bruyeres le Chatel, 91297 Arpajon Cedex (France)

2014-03-07T23:59:59.000Z

104

Fine-scale spatial genetic structure and within population male-biased gene-flow in the grasshopper Mioscirtus wagneri  

Science Journals Connector (OSTI)

Dispersal is a life history trait that plays a key role in population dynamics, determining gene flow and influencing the size, structure and persistence of populations. For these reasons, the study of the gen...

Joaqun Ortego; Maria Pilar Aguirre; Pedro J. Cordero

2011-09-01T23:59:59.000Z

105

3D Imaging of Nickel Oxidation States using Full Field X-ray Absorption Near Edge Structure Nanotomography  

SciTech Connect

Reduction-oxidation (redox) cycling of the nickel electrocatalyst phase in the solid oxide fuel cell (SOFC) anode can lead to performance degradation and cell failure. A greater understanding of nickel redox mechanisms at the microstructural level is vital to future SOFC development. Transmission x-ray microscopy (TXM) provides several key techniques for exploring oxidation states within SOFC electrode microstructure. Specifically, x-ray nanotomography and x-ray absorption near edge structure (XANES) spectroscopy have been applied to study samples of varying nickel (Ni) and nickel oxide (NiO) compositions. The imaged samples are treated as mock SOFC anodes containing distinct regions of the materials in question. XANES spectra presented for the individual materials provide a basis for the further processing and analysis of mixed samples. Images of composite samples obtained are segmented, and the distinct nickel and nickel oxide phases are uniquely identified using full field XANES spectroscopy. Applications to SOFC analysis are discussed.

Nelson, George; Harris, William; Izzo, John; Grew, Kyle N. (Connecticut); (USARL)

2012-01-20T23:59:59.000Z

106

Utilization of Structured Packing for Energy Savings in Distillation and Absorption Columns  

E-Print Network (OSTI)

. GLYCOL CONTACTOR While glycol contactors for natural gas dehydration have traditionally used bubble cap trays or, more recently, valve trays, structured packings have been applied with increasing success. With continuing changes in oil field gas... production rates, trayed glycol contactors are often gas production rates, trayed glycol contactors are often operating at the limits of their hydraulic capacity. For the high vapor and low 1iquid loadings typical of these applications, the hydraulic...

Berven, O. J.; Howard, W. E.

107

Solar selective absorption coatings  

DOE Patents (OSTI)

A new class of solar selective absorption coatings are disclosed. These coatings comprise a structured metallic overlayer such that the overlayer has a sub-micron structure designed to efficiently absorb solar radiation, while retaining low thermal emissivity for infrared thermal radiation. A sol-gel layer protects the structured metallic overlayer from mechanical, thermal, and environmental degradation. Processes for producing such solar selective absorption coatings are also disclosed.

Mahoney, Alan R. (Albuquerque, NM); Reed, Scott T. (Albuquerque, NM); Ashley, Carol S. (Albuquerque, NM); Martinez, F. Edward (Horseheads, NY)

2003-10-14T23:59:59.000Z

108

Solar selective absorption coatings  

DOE Patents (OSTI)

A new class of solar selective absorption coatings are disclosed. These coatings comprise a structured metallic overlayer such that the overlayer has a sub-micron structure designed to efficiently absorb solar radiation, while retaining low thermal emissivity for infrared thermal radiation. A sol-gel layer protects the structured metallic overlayer from mechanical, thermal, and environmental degradation. Processes for producing such solar selective absorption coatings are also disclosed.

Mahoney, Alan R. (Albuquerque, NM); Reed, Scott T. (Albuquerque, NM); Ashley, Carol S. (Albuquerque, NM); Martinez, F. Edward (Horseheads, NY)

2004-08-31T23:59:59.000Z

109

Temperature dependence of plasmonic terahertz absorption in grating-gate gallium-nitride transistor structures  

Science Journals Connector (OSTI)

Strong plasmon resonances have been observed in the terahertz transmission spectra (15 THz) of large-area slit-grating-gate AlGaN/GaN-based high-electron-mobility transistor(HEMT) structures at temperatures from 10 to 170 K. The resonance frequencies correspond to the excitation of plasmons with wave vectors equal to the reciprocal lattice vectors of the metal grating which serves both as a gate electrode for the HEMT and a coupler between plasmons and incident terahertz radiation. Wide tunability of the resonances by the applied gate voltage demonstrates potential of these devices for terahertz applications.

A. V. Muravjov; D. B. Veksler; V. V. Popov; O. V. Polischuk; N. Pala; X. Hu; R. Gaska; H. Saxena; R. E. Peale; M. S. Shur

2010-01-01T23:59:59.000Z

110

X-ray absorption spectroscopy on solid krypton up to 20 GPa  

Science Journals Connector (OSTI)

High-pressure properties of krypton were investigated by energy-dispersive extended x-ray absorption fine-structure spectroscopy in a diamond anvil cell at room temperature. The equation of state agrees very well with x-ray diffraction data. The pressure dependence of the Debye-Waller factor was determined and compared with calculations using pair potentials. The analysis of the x-ray absorption near-edge structure part of the spectrum shows the possibility of measuring the pressure in bubbles of krypton implanted in metallic matrices.

A. Polian; J. P. Itie; E. Dartyge; A. Fontaine; G. Tourillon

1989-02-15T23:59:59.000Z

111

An application of Ti-K X-ray absorption edges and fine structures to the study of substoichiometric titanium carbide TiC1-x  

E-Print Network (OSTI)

of substoichiometric titanium carbide TiC1-x V. Moisy-Maurice and C. H. de Novion C.E.A./IRDI/DMECN/DTech, Laboratoire des échantillons de TiC1-x, (0,5 ~ 1 - x ~ 0,97). Quand la teneur x en lacunes de carbone augmente, (i 4p du titane (situé à 10-15 eV au-dessus du niveau de Fermi EF dans TiC0,97) se déplace

Paris-Sud XI, Université de

112

THE STRUCTURAL CHEMISTRY OF MOLYBDENUM IN MODEL HIGH LEVEL NUCLEAR WASTE GLASSES, INVESTIGATED BY MO K-EDGE X-RAY ABSORPTION  

E-Print Network (OSTI)

THE STRUCTURAL CHEMISTRY OF MOLYBDENUM IN MODEL HIGH LEVEL NUCLEAR WASTE GLASSES, INVESTIGATED of molybdenum in model UK high level nuclear waste glasses was investigated by X-ray Absorption Spectroscopy (XAS). Molybdenum K-edge XAS data were acquired from several inactive simulant high level nuclear waste

Sheffield, University of

113

The synthesis, single-crystal structure, optical absorption, and resistivity of Th{sub 2}GeSe{sub 5}  

SciTech Connect

The compound Th{sub 2}GeSe{sub 5} has been synthesized by the reaction of the elements at 1273 K. From a single-crystal study Th{sub 2}GeSe{sub 5} crystallizes in the Ba{sub 5}Si{sub 3} structure type with four formula units in the space group D{sup 8}{sub 4h}?P4/ncc of the tetragonal system in a cell with dimensions a=7.4968(4) and c=13.6302(9) at 100(2) K. From optical absorption measurements Th{sub 2}GeSe{sub 5} is found to have an optical band gap of 1.92 eV (indirect) or 1.98 eV (direct), consistent with its red color. Th{sub 2}GeSe{sub 5} is a wide gap semiconductor, as indicated by its electrical resistivity at 298 K of 4.37(2)10{sup 9} ? cm measured on a single crystal. - Graphical abstract: The structure of Th{sub 2}GeSe{sub 5}. Display Omitted - Highlights: The new compound Th{sub 2}GeSe{sub 5} was synthesized from the elements and recrystallized from Sb{sub 2}Se{sub 3}. Th{sub 2}GeSe{sub 5} crystallizes in the Ba{sub 5}Si{sub 3} structure type. The band gap of Th{sub 2}GeSe{sub 5} is1.92 eV and its resistivity shows it to be a wide gap semiconductor.

Koscielski, Lukasz A.; Malliakas, Christos D.; Sarjeant, Amy A.; Ibers, James A., E-mail: ibers@chem.northwestern.edu

2013-09-15T23:59:59.000Z

114

MID-INFRARED ATOMIC FINE-STRUCTURE EMISSION-LINE SPECTRA OF LUMINOUS INFRARED GALAXIES: SPITZER/IRS SPECTRA OF THE GOALS SAMPLE  

SciTech Connect

We present the data and our analysis of mid-infrared atomic fine-structure emission lines detected in Spitzer/Infrared Spectrograph high-resolution spectra of 202 local Luminous Infrared Galaxies (LIRGs) observed as part of the Great Observatories All-sky LIRG Survey (GOALS). We readily detect emission lines of [S IV], [Ne II], [Ne V], [Ne III], [S III]{sub 18.7{sub ?m}}, [O IV], [Fe II], [S III]{sub 33.5{sub ?m}}, and [Si II]. More than 75% of these galaxies are classified as starburst-dominated sources in the mid-infrared, based on the [Ne V]/[Ne II] line flux ratios and equivalent width of the 6.2 ?m polycyclic aromatic hydrocarbon feature. We compare ratios of the emission-line fluxes to those predicted from stellar photo-ionization and shock-ionization models to constrain the physical and chemical properties of the gas in the starburst LIRG nuclei. Comparing the [S IV]/[Ne II] and [Ne III]/[Ne II] line ratios to the Starburst99-Mappings III models with an instantaneous burst history, the emission-line ratios suggest that the nuclear starbursts in our LIRGs have ages of 1-4.5 Myr, metallicities of 1-2 Z{sub ?}, and ionization parameters of 2-8 10{sup 7} cm s{sup 1}. Based on the [S III]{sub 33.5{sub ?m}}/[S III]{sub 18.7{sub ?m}} ratios, the electron density in LIRG nuclei is typically one to a few hundred cm{sup 3}, with a median electron density of ?300 cm{sup 3}, for those sources above the low density limit for these lines. We also find that strong shocks are likely present in 10 starburst-dominated sources of our sample. A significant fraction of the GOALS sources (80) have resolved neon emission-line profiles (FWHM ?600 km s{sup 1}) and five show clear differences in the velocities of the [Ne III] or [Ne V] emission lines, relative to [Ne II], of more than 200 km s{sup 1}. Furthermore, six starburst and five active galactic nucleus dominated LIRGs show a clear trend of increasing line width with ionization potential, suggesting the possibility of a compact energy source and stratified interstellar medium in their nuclei. We confirm a strong correlation between the sum of the [Ne II]{sub 12.8{sub ?m}} and [Ne III]{sub 15.5{sub ?m}} emission, as well as [S III]{sub 33.5{sub ?m}}, with both the infrared luminosity and the 24 ?m warm dust emission measured from the spectra, consistent with all three lines tracing ongoing star formation. Finally, we find no correlation between the hardness of the radiation field or the emission-line width and the ratio of the total infrared to 8 ?m emission (IR8), a measure of the strength of the starburst and the distance of the LIRGs from the star-forming main sequence. This may be a function of the fact that the infrared luminosity and the mid-infrared fine-structure lines are sensitive to different timescales over the starburst, or that IR8 is more sensitive to the geometry of the region emitting the warm dust than the radiation field producing the H II region emission.

Inami, H. [National Optical Astronomy Observatory, Tucson, AZ 85719 (United States); Armus, L.; Stierwalt, S.; Daz-Santos, T.; Surace, J.; Howell, J.; Marshall, J. [Spitzer Science Center, California Institute of Technology, CA 91125 (United States); Charmandaris, V. [Department of Physics and Institute of Theoretical and Computational Physics, University of Crete, GR-71003 Heraklion (Greece); Groves, B. [Max Planck Institute for Astronomy, Knigstuhl 17, D-69117 Heidelberg (Germany); Kewley, L. [Research School of Astronomy and Astrophysics, The Australian National University, Cotter Road, Weston Creek, ACT 2611 (Australia); Petric, A. [Department of Astronomy, California Institute of Technology, MS 320-47, Pasadena, CA 91125 (United States); Rich, J. [The Observatories, Carnegie Institute of Washington, 813 Santa Barbara Street, Pasadena, CA 91101 (United States); Haan, S. [CSIRO Astronomy and Space Science, Marsfield, NSW 2122 (Australia); Evans, A. S. [Department of Astronomy, University of Virginia, P.O. Box 400325, Charlottesville, VA 22904 (United States); Mazzarella, J.; Lord, S. [Infrared Processing and Analysis Center, MS 100-22, California Institute of Technology, Pasadena, CA 91125 (United States); Appleton, P. [NASA Herschel Science Center, 770 South Wilson Avenue, Pasadena, CA 91125 (United States); Spoon, H. [Astronomy Department, Cornell University, Ithaca, NY 14853 (United States); Frayer, D. [National Radio Astronomy Observatory, P.O. Box 2, Green Bank, WV 24944 (United States); Matsuhara, H., E-mail: inami@noao.edu [Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (Japan); and others

2013-11-10T23:59:59.000Z

115

Femtosecond laser-induced modification of potassium-magnesium silicate glasses: An analysis of structural changes by near edge x-ray absorption spectroscopy  

SciTech Connect

The effects of femtosecond laser pulse irradiation on the glass structure of alkaline silicate glasses were investigated by x-ray absorption near edge structure spectroscopy using the beamline of the Physikalisch-Technische Bundesanstalt at the electron synchrotron BESSY II in Berlin (Germany) by analyzing the magnesium K-edge absorption peak for different laser fluences. The application of fluences above the material modification threshold (2.1 J/cm{sup 2}) leads to a characteristic shift of {approx}1.0 eV in the K-edge revealing a reduced ({approx}3%) mean magnesium bond length to the ligated oxygen ions (Mg-O) along with a reduced average coordination number of the Mg ions.

Seuthe, T.; Eberstein, M. [Fraunhofer-Institut fuer Keramische Technologien und Systeme (IKTS), Winterbergstrasse 28, 01277 Dresden (Germany); Hoefner, M.; Eichler, H. J.; Grehn, M. [Technische Universitaet Berlin, Institut fuer Optik und Atomare Physik, Strasse des 17. Juni 135, 10623 Berlin (Germany); Reinhardt, F. [Physikalisch-Technische Bundesanstalt (PTB), Abbestr. 2-12, 10587 Berlin (Germany); Tsai, W. J. [ITRI South, Industrial Technology Research Institute, 8 Gongyan Rd., Liu-jia District, Tainan City 73445, Taiwan (China); Bonse, J. [BAM Bundesanstalt fuer Materialforschung und - pruefung, Unter den Eichen 87, 12205 Berlin (Germany)

2012-05-28T23:59:59.000Z

116

X-Ray Tomographic Imaging of Crystal Structure at the Atomic Level P. Korecki,1,* M. Tolkiehn,2  

E-Print Network (OSTI)

X-Ray Tomographic Imaging of Crystal Structure at the Atomic Level P. Korecki,1,* M. Tolkiehn,2 D of the crystal structure from real-space projections obtained by illuminating the sample with white x rays. This approach was applied to the pattern of the directional fine structure in absorption of white x rays

Korecki, Pawe³

117

Defect structures and the MgO-doping-level-threshold effect on the optical absorption of reduced MgO-doped lithium niobate  

Science Journals Connector (OSTI)

Congruent LiNbO3 crystals have been doped with Mg impurity to levels of 1.0, 2.7, 5.0, and 6.0 mol %. With doping levels between 5.0 and 6.0 mol %, there was an abrupt change in the features of the optical absorption. This observation is consistent with our theoretical calculation, which independently predicted that the critical magnesium concentration, [Mg], for the threshold effect should occur at [Mg]c=5.3 mol %. The spectra exhibit anisotropy. Defect-structure models are proposed. We demonstrate that, under thermochemical reduction, the density of the crystal increases and oxygen vacancies are also formed. We propose that when congruent crystals are thermochemically reduced, the observed optical absorptions are due to defects comprising both oxygen vacancies and different types of dipolarons.

Qi-Ren Zhang and Xi-Qi Feng

1991-05-15T23:59:59.000Z

118

In Situ X-ray Absorption Near-Edge Structure Spectroscopy of ZnO Nanowire Growth During Chemical Bath Deposition  

SciTech Connect

Chemical bath deposition (CBD) offers a simple and inexpensive route to deposit semiconductor nanostructures, but lack of fundamental understanding and control of the underlying chemistry has limited its versatility. Here we report the first use of in situ X-ray absorption spectroscopy during CBD, enabling detailed investigation of both reaction mechanisms and kinetics of ZnO nanowire growth from zinc nitrate and hexamethylenetetramine (HMTA) precursors. Time-resolved X-ray absorption near-edge structure (XANES) spectra were used to quantify Zn(II) speciation in both solution and solid phases. ZnO crystallizes directly from [Zn(H{sub 2}O){sub 6}]{sup 2+} without long-lived intermediates. Using ZnO nanowire deposition as an example, this study establishes in situ XANES spectroscopy as an excellent quantitative tool to understand CBD of nanomaterials.

McPeak, Kevin M.; Becker, Matthew A.; Britton, Nathan G.; Majidi, Hasti; Bunker, Bruce A.; Baxter, Jason B. (Drexel); (Notre)

2010-12-03T23:59:59.000Z

119

The electronic structure of poly(pyridine-2,5-diyl) investigated by soft x-ray absorption and emission spectroscopies  

E-Print Network (OSTI)

The electronic structure of the poly-pyridine conjugated polymer has been investigated by resonant and nonresonant inelastic X-ray scattering and X-ray absorption spectroscopies using synchrotron radiation. The measurements were made for both the carbon and nitrogen contents of the polymer. The analysis of the spectra has been carried out in comparison with molecular orbital calculations taking the repeat-unit cell as a model molecule of the polymer chain. The simulations indicate no significant differences in the absorption and in the non-resonant X-ray scattering spectra for the different isomeric geometries, while some isomeric dependence of the resonant spectra is predicted. The resonant emission spectra show depletion of the {\\pi} electron bands in line with symmetry selection and momentum conservation rules. The effect is most vizual for the carbon spectra; the nitrogen spectra are dominated by lone pair n orbital emission of {\\sigma} symmetry and are less frequency dependent.

Magnuson, M; Guo, J - H; Sthe, C; Agui, A; Nordgren, J; Luo, Y; gren, H; Johansson, N; Salaneck, W R; Horsburgh, L E; Monkman, A P; 10.1016/S0301-0104(98)00262-6

2012-01-01T23:59:59.000Z

120

X-ray absorption spectroscopy from H-passivated porous Si and oxidized Si nanocrystals  

SciTech Connect

Quantum confinement in nanoscale Si structures is widely believed to be responsible for the visible luminescence observed from anodically etched porous silicon (por-Si), but little is known about the actual size or shape of these structures. Extended x-ray absorption fine structure data from a wide variety of por-Si samples show significantly reduced average Si coordination numbers due to the sizable contribution of surface-coordinated H. (The IUSI ratios, as large as 1.2, were independently confirmed by ir-absorption and {alpha}-recoil measurements.) The Si coordinations imply very large surface/volume ratios, enabling the average Si structures to be identified as crystalline particles (not wires) whose dimensions are typically <15 {Angstrom}. Comparison of the size-dependent peak luminescence energies with those of oxidized Si nanocrystals, whose shapes are known, shows remarkable agreement. Furthermore, near-edge x-ray absorption fine structure measurements of the nanocrystals shows the outer oxide and interfacial suboxide layers to be constant over a wide range of nanocrystal sizes. The combination of these results effectively rules out surface species as being responsible for the observed visible luminescence in por-Si, and strongly supports quantum confinement as the dominant mechanism occurring in Si particles which are substantially smaller than previously reported or proposed.

Schuppler, S.; Marcus, M.A. [AT and T Bell Labs., Murray Hill, NJ (United States); Friedman, S.L. [Stanford Univ., Palo Alto, CA (United States). Dept. of Applied Physics] [and others

1994-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "absorption fine structure" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

X-ray Absorption and Emission Spectroscopy Study of the Effect of Doping on the Low Energy Electronic Structure of PrFeAsO1-[delta  

E-Print Network (OSTI)

X-ray Absorption and Emission Spectroscopy Study of theusing soft X-ray absorption and emission spectroscopy. The2. (a) Oxygen 1s x-ray absorption spectra of PrFeAsO 1-? (?

Freelon, Byron

2010-01-01T23:59:59.000Z

122

Electromagnetic waves reflection, transmission and absorption by graphene - magnetic semiconductor - graphene sandwich-structure in magnetic field: Faraday geometry  

E-Print Network (OSTI)

Electrodynamic properties of the graphene - magnetic semiconductor - graphene sandwich-structure have been investigated theoretically with taking into account the dissipation processes. Influence of graphene layers on electromagnetic waves propagation in graphene - semi-infinte magnetic semiconductor and graphene - magnetic semiconductor - graphene sandwich-structure has been analyzed. Frequency and field dependences of the reflectance, transmittance and absorbtance of electromagnetic waves by such structure have been calculated. The size effects associated with the thickness of the structure have been analyzed. The possibility of efficient control of electrodynamic properties of graphene - magnetic semiconductor - graphene sandwich structure by an external magnetic field has been shown.

Kuzmin, Dmitry A; Shavrov, Vladimir G

2014-01-01T23:59:59.000Z

123

Temperature dependent electronic structure of Pr{sub 0.67}Sr{sub 0.33}MnO{sub 3} film probed by X-ray absorption near edge structure  

SciTech Connect

The Mn K edge X-ray absorption near edge structures (XANES) of Pr{sub 0.67}Sr{sub 0.33}MnO{sub 3} film (100 nm) on (001) LaAlO{sub 3} substrate was measured at different temperatures to probe the MnO{sub 6} octahedron distortion and corresponding electronic structure. The absorption of high temperature paramagnetic-insulator phase differed from that of the low temperature ferromagnetic-metal phase. The temperature-dependent absorption intensity of Mn K edge XANES was correlated with the relaxation of distorted MnO{sub 6} octahedron, which changed the crystal field acting on the Mn site and the related electronic structure and properties. At low temperature, the splitting of Mn majority e{sub g} orbitals decreased and the density of states above the Fermi level increased in the relaxed MnO{sub 6} octahedron, as reflected by a wider separation between two sub-peaks in the pre-edge XANES spectra.

Zhang, Bangmin [Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439 (United States); Department of Materials Science and Engineering, National University of Singapore, Singapore 117576 (Singapore); NUSNNI-Nanocore, National University of Singapore, Singapore 117411 (Singapore); Sun, Cheng-Jun, E-mail: cjsun@aps.anl.gov, E-mail: msecgm@nus.edu.sg; Heald, Steve M. [Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439 (United States); Chen, Jing-Sheng; Moog Chow, Gan, E-mail: cjsun@aps.anl.gov, E-mail: msecgm@nus.edu.sg [Department of Materials Science and Engineering, National University of Singapore, Singapore 117576 (Singapore); Venkatesan, T. [NUSNNI-Nanocore, National University of Singapore, Singapore 117411 (Singapore); Department of Physics, National University of Singapore, Singapore 117542 (Singapore); Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117576 (Singapore)

2014-05-07T23:59:59.000Z

124

Efficient optical absorption enhancement in organic solar cells by using a 2-dimensional periodic light trapping structure  

SciTech Connect

We have investigated the effects induced by periodic nanosphere arrays on the performance of organic solar cells (OSCs). Two-dimensional periodic arrays of polystyrene nanospheres were formed by using a colloidal lithography method together with plasma etching to trim down the size to various degrees on the substrates of OSCs. It is found that the devices prepared on such substrates can have improved light harvesting, resulting in as high as 35% enhancement in power conversion efficiency over that of the reference devices. The measured external quantum efficiency and finite-difference time-domain simulation reveal that the controlled periodic morphology of the substrate can efficiently increase light scattering in the device and thus enhance the absorption of incident light.

Zu, Feng-Shuo [Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Institute of Functional Nano and Soft Materials (FUNSOM), Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, Jiangsu 215123 (China); Center of Super-Diamond and Advanced Films (COSDAF) and Department of Physics and Materials Science, City University of Hong Kong, Hong Kong SAR (China); Shi, Xiao-Bo; Liang, Jian; Xu, Mei-Feng; Wang, Zhao-Kui, E-mail: lsliao@suda.edu.cn, E-mail: zkwang@suda.edu.cn, E-mail: apcslee@cityu.edu.hk; Liao, Liang-Sheng, E-mail: lsliao@suda.edu.cn, E-mail: zkwang@suda.edu.cn, E-mail: apcslee@cityu.edu.hk [Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Institute of Functional Nano and Soft Materials (FUNSOM), Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, Jiangsu 215123 (China); Lee, Chun-Sing, E-mail: lsliao@suda.edu.cn, E-mail: zkwang@suda.edu.cn, E-mail: apcslee@cityu.edu.hk [Center of Super-Diamond and Advanced Films (COSDAF) and Department of Physics and Materials Science, City University of Hong Kong, Hong Kong SAR (China)

2014-06-16T23:59:59.000Z

125

Root Absorption  

NLE Websites -- All DOE Office Websites (Extended Search)

Root Absorption Root Absorption Name: Carolyn Location: N/A Country: N/A Date: N/A Question: MY Neice is doing a science fair project on plants. More specifically she needs to know if you water your flowering plants with colored water, does the flower change colors and if so, why? Replies: Dear Carolyn, Dyeing flowers works best on cut stems in water: http://youth.net/nsrc/sci/sci032.html#anchor598182 Title: The Effect Of Color On The Speed Of Dyeing Flowers Some rooted plants can change flower color by altering the soil pH: http://www.cahe.nmsu.edu/pubs/yard/1996/120996.html Sincerely, Anthony R. Brach This sounds like a good question for a science project. I think she should do the project first and get some data and then try to answer the question herself. If she can't figure it out, then she should look for some help.

126

Electronic and atomic structures of Ti{sub 1-x}Al{sub x}N thin films related to their damage behavior  

SciTech Connect

Ti and Al K-edge x-ray absorption spectroscopy is used to investigate the electronic structure of Ti{sub 1-x}Al{sub x}N thin films deposited by reactive magnetron sputtering. The experimental near edge spectra of TiN and AlN are interpreted in the light of unoccupied density of state band structure calculations. The comparison of the structural parameters derived from x-ray absorption fine structure and x-ray diffraction reveals segregation between Al-rich and Ti-rich domains within the Ti{sub 1-x}Al{sub x}N films. Whereas x-ray diffraction probes only the crystallized domains, the structural information derived from extended x-ray absorption fine structure analysis turns on both crystalline and grain boundaries. The results are discussed by considering the damage behavior of the films depending on the composition.

Tuilier, M.-H.; Pac, M.-J.; Girleanu, M.; Covarel, G.; Arnold, G.; Louis, P. [Laboratoire de Mecanique, Materiaux et Procedes de Fabrication, Universite de Haute Alsace, 61 rue Albert Camus, F-68093 Mulhouse cedex (France); Rousselot, C. [Institut FEMTO-ST (UMR CNRS 6174), Universite de Franche-Comte, BP 71427, F-25211 Montbeliard cedex (France); Flank, A.-M. [CNRS--UR1 SOLEIL, F-91192 Gif sur Yvette cedex (France)

2008-04-15T23:59:59.000Z

127

Electronic structures and bonding properties of chlorine-treated nitrogenated carbon nanotubes: X-ray absorption and scanning photoelectron microscopy studies  

SciTech Connect

The electronic and bonding properties of nitrogenated carbon nanotubes (N-CNTs) exposed to chlorine plasma were investigated using C and N K-edge x-ray absorption near-edge structure (XANES) and scanning photoelectron microscopy (SPEM). The C and N K-edge XANES spectra of chlorine-treated N-CNTs consistently reveal the formation of pyridinelike N-CNTs by the observation of 1s{yields}{pi}*(e{sub 2u}) antibonding and 1s{yields}{pi}*(b{sub 2g}) bonding states. The valence-band photoemission spectra obtained from SPEM images indicate that chlorination of the nanotubes enhances the C-N bonding. First-principles calculations of the partial densities of states in conjunction with C K-edge XANES data identify the presence of C-Cl bonding in chlorine treated N-CNTs.

Ray, S. C.; Pao, C. W.; Tsai, H. M.; Chiou, J. W.; Pong, W. F.; Chen, C. W.; Tsai, M.-H.; Papakonstantinou, P.; Chen, L. C.; Chen, K. H.; Graham, W. G. [Department of Physics, Tamkang University, Tamsui 251, Taiwan (China); Department of Materials Science and Engineering, National Taiwan University, Taipei 106, Taiwan (China); Department of Physics, National Sun Yat-Sen University, Kaohsiung 804, Taiwan (China); NRI, School of Electrical and Mechanical Engineering, University of Ulster at Jordanstown, Newtownabbey, County Antrim BT37OQB, Northern Ireland (United Kingdom); Center for Condensed Matter Sciences, National Taiwan University, Taipei 106, Taiwan (China); Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 106, Taiwan (China); Department of Physics and Astronomy, Queens University of Belfast, Belfast, Antrim BT71NN, Northern Ireland (United Kingdom)

2007-05-07T23:59:59.000Z

128

X-Ray Absorption Spectroscopy of Metallobiomolecules  

E-Print Network (OSTI)

2/9/07 1 X-Ray Absorption Spectroscopy of Metallobiomolecules The Outskirts of Structural Biology 9, 07] This is a tutorial about the use of X-ray Absorption Spectroscopy (XAS) in biology, RG; Eisenberger, P; Kincaid, BM "X-ray Absorption Spectroscopy of Biological Molecules" Annu. Rev

Scott, Robert A.

129

X-Ray Absorption Spectroscopy of Metallobiomolecules  

E-Print Network (OSTI)

9/6/09 1 X-Ray Absorption Spectroscopy of Metallobiomolecules The Outskirts of Structural Biology 6, 09] This is a tutorial about the use of X-ray Absorption Spectroscopy (XAS) in biology, RG; Eisenberger, P; Kincaid, BM "X-ray Absorption Spectroscopy of Biological Molecules" Annu. Rev

Scott, Robert A.

130

Laser excited, state detected calcium?rare gas collisional energy transfer: Ca(4s5p? 1 P 1) spin changing and Ca(4s5p? 3 P 1) fine structure changing cross sections  

Science Journals Connector (OSTI)

Pulsed dye laser excitation along with time and wavelength?resolved fluorescence detection techniques are used to measure cross sections for state changing collisions of Ca(4s5p? 1 P 1) and Ca(4s5p? 3 P 1) with the rare gases He Ne Ar Kr and Xe. The Ca(4s5p? 1 P 1)+M deactivation involves a near?resonant spin changing process which populates predominantly the Ca(4s5p? 3 P 2 1 0) states. The total deactivation cross sections for 1 P 1 are 22 25 5 3 13 and 31 2 (20%) for 3He 4He Ne Ar Kr and Xe respectively. The cross sections for Ca(4s5p? 3 P 1)+M fine?structure changes are 38 25 46 56 and 135 2 (35%) for He Ne Ar Kr and Xe respectively. Branching ratios for the electronic energy transfer Ca(4s5p? 1 P 1)+He?Ca(4s5p? 3 P j 3d4p? 3 F j and 3d4p? 1 D 2)+He are determined to be 903:64:32 respectively compared to statistical values of 26:60:14. The predominant product states 4s5p 3 P 2 1 0 are produced by a near?resonant spin changing process; the fine structure components of the 3 P state are populated essentially statistically (55:33:11). Fine?structure branching Ca(4s5p? 3 P 1)+M?Ca(4s5p? 3 P 2 0)+M is also measured and gives a statistical distribution of Ca(4s5p? 3 P 2 0) states. The radiative lifetimes of the 4s5p? 1 P 1 and 4s5p? 3 P 1 levels are measured to be 652 and 718 ns respectively. The results are discussed in terms of the competing effects of velocity and interaction strengths on the curve crossing probabilities.

Michael O. Hale; Stephen R. Leone

1983-01-01T23:59:59.000Z

131

X-ray absorption spectroscopic studies of mononuclear non-heme iron enzymes  

SciTech Connect

Fe-K-edge X-ray absorption spectroscopy (XAS) has been used to investigate the electronic and geometric structure of the iron active site in non-heme iron enzymes. A new theoretical extended X-ray absorption fine structure (EXAFS) analysis approach, called GNXAS, has been tested on data for iron model complexes to evaluate the utility and reliability of this new technique, especially with respect to the effects of multiple-scattering. In addition, a detailed analysis of the 1s{yields}3d pre-edge feature has been developed as a tool for investigating the oxidation state, spin state, and geometry of iron sites. Edge and EXAFS analyses have then been applied to the study of non-heme iron enzyme active sites.

Westre, T.E.

1996-01-01T23:59:59.000Z

132

Fluorescence excitation and ultraviolet absorption spectra and theoretical calculations for benzocyclobutane: Vibrations and structure of its excited S{sub 1}(?,?{sup *}) electronic state  

SciTech Connect

The fluorescence excitation spectra of jet-cooled benzocyclobutane have been recorded and together with its ultraviolet absorption spectra have been used to assign the vibrational frequencies for this molecule in its S{sub 1}(?,?{sup *}) electronic excited state. Theoretical calculations at the CASSCF(6,6)/aug-cc-pVTZ level of theory were carried out to compute the structure of the molecule in its excited state. The calculated structure was compared to that of the molecule in its electronic ground state as well as to the structures of related molecules in their S{sub 0} and S{sub 1}(?,?{sup *}) electronic states. In each case the decreased ? bonding in the electronic excited states results in longer carbon-carbon bonds in the benzene ring. The skeletal vibrational frequencies in the electronic excited state were readily assigned and these were compared to the ground state and to the frequencies of five similar molecules. The vibrational levels in both S{sub 0} and S{sub 1}(?,?{sup *}) states were remarkably harmonic in contrast to the other bicyclic molecules. The decreases in the frequencies of the out-of-plane skeletal modes reflect the increased floppiness of these bicyclic molecules in their S{sub 1}(?,?{sup *}) excited state.

Shin, Hee Won; Ocola, Esther J.; Laane, Jaan, E-mail: laane@mail.chem.tamu.edu [Department of Chemistry, Texas A and M University, College Station, Texas 77843-3255 (United States)] [Department of Chemistry, Texas A and M University, College Station, Texas 77843-3255 (United States); Kim, Sunghwan [National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, Department of Health and Human Services, 8600 Rockville Pike, Bethesda, Maryland 20894 (United States)] [National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, Department of Health and Human Services, 8600 Rockville Pike, Bethesda, Maryland 20894 (United States)

2014-01-21T23:59:59.000Z

133

The {ital b} Distribution and the Velocity Structure of Absorption Peaks in the Ly{alpha} Forest  

SciTech Connect

A theory is developed that relates the observed {ital b} parameter of a Ly{alpha} absorption line to the velocity curvature of the corresponding peak in the optical depth fluctuation. Its relation to the traditional interpretation of {ital b} as the thermal broadening width is discussed. It is demonstrated that, independent of the details of the cosmological model, the differential {ital b} distribution has a high-{ital b} asymptote of dN/db{proportional_to}b{sup {minus}m}, where m{ge}5, when we make the reasonable assumption that low-curvature fluctuations are statistically favored over high-curvature ones. There in general always exist lines much broader than the thermal width. We develop a linear perturbative analysis of the optical depth fluctuation, which yields a single-parameter prediction for the full {ital b} distribution. In addition to exhibiting the high-velocity tail, it qualitatively explains the observed sharp low-{ital b} cutoff{emdash}a simple reflection of the fact that high-curvature fluctuations are relatively rare. Although the existence of the high-{ital b} asymptote, which is independent of the validity of the linear expansion, is consistent with the observed {ital b} distribution, a detailed comparison of the linear prediction with six observational data sets indicates that higher order corrections are not negligible. The perturbative analysis nonetheless offers valuable insights into the dependence of the {ital b} distribution on cosmological parameters such as {Omega} and the power spectrum. A key parameter is the effective smoothing scale of the optical depth fluctuation, which is in turn determined by three scales: the thermal broadening width, the baryon smoothing scale (approximately the Jeans scale), and the observation/simulation resolution. The first two are determined by reionization history, but are comparable in general, whereas the third varies by about an order of magnitude in current hydrodynamic simulations. Studies with non{endash}resolution-dominated {ital b} distributions can be used to probe the reionization history of the universe. {copyright} {ital {copyright} 1999.} {ital The American Astronomical Society}

Hui, L. [NASA/Fermilab Astrophysics Center, Fermi National Accelerator Laboratory, Batavia, IL 60510 (United States)] [NASA/Fermilab Astrophysics Center, Fermi National Accelerator Laboratory, Batavia, IL 60510 (United States); Rutledge, R.E. [Max-Planck-Institut fuer extraterrestrische Physik, Postfach 1603, D-85740 Garching (Germany)] [Max-Planck-Institut fuer extraterrestrische Physik, Postfach 1603, D-85740 Garching (Germany)

1999-06-01T23:59:59.000Z

134

The [ital b] Distribution and the Velocity Structure of Absorption Peaks in the Ly[alpha] Forest  

SciTech Connect

A theory is developed that relates the observed [ital b] parameter of a Ly[alpha] absorption line to the velocity curvature of the corresponding peak in the optical depth fluctuation. Its relation to the traditional interpretation of [ital b] as the thermal broadening width is discussed. It is demonstrated that, independent of the details of the cosmological model, the differential [ital b] distribution has a high-[ital b] asymptote of dN/db[proportional to]b[sup [minus]m], where m[ge]5, when we make the reasonable assumption that low-curvature fluctuations are statistically favored over high-curvature ones. There in general always exist lines much broader than the thermal width. We develop a linear perturbative analysis of the optical depth fluctuation, which yields a single-parameter prediction for the full [ital b] distribution. In addition to exhibiting the high-velocity tail, it qualitatively explains the observed sharp low-[ital b] cutoff[emdash]a simple reflection of the fact that high-curvature fluctuations are relatively rare. Although the existence of the high-[ital b] asymptote, which is independent of the validity of the linear expansion, is consistent with the observed [ital b] distribution, a detailed comparison of the linear prediction with six observational data sets indicates that higher order corrections are not negligible. The perturbative analysis nonetheless offers valuable insights into the dependence of the [ital b] distribution on cosmological parameters such as [Omega] and the power spectrum. A key parameter is the effective smoothing scale of the optical depth fluctuation, which is in turn determined by three scales: the thermal broadening width, the baryon smoothing scale (approximately the Jeans scale), and the observation/simulation resolution. The first two are determined by reionization history, but are comparable in general, whereas the third varies by about an order of magnitude in current hydrodynamic simulations. Studies with non[endash]resolution-dominated [ital b] distributions can be used to probe the reionization history of the universe. [copyright] [ital [copyright] 1999.] [ital The American Astronomical Society

Hui, L. (NASA/Fermilab Astrophysics Center, Fermi National Accelerator Laboratory, Batavia, IL 60510 (United States)); Rutledge, R.E. (Max-Planck-Institut fuer extraterrestrische Physik, Postfach 1603, D-85740 Garching (Germany))

1999-06-01T23:59:59.000Z

135

Iron Absorption  

NLE Websites -- All DOE Office Websites (Extended Search)

Iron Absorption Iron Absorption Name: Mary Location: N/A Country: N/A Date: N/A Question: I wrote before to Steve and got a answer back. I would like more information. The cirmcustances were that I first had anaemia and then I went for a gastroscopy. The results of which were I had insufficient acid been produced in the stomach. I was told that acid was nessary for the absorbion of iron and it was because of this that I became anaemic. I was told to eat plently of red meat not too many vegetables. Is there any other information you can give me? Replies: It is very difficult to say for sure without seeing you chart and I am not your doctor. But it sounds to me like you are deficient in the vitamin B12. In your stomach you have 3 basic types of cells. One is called chief cells which secrete the precursor of the enzyme pepsin which begins the breakdown of protein. Another is called the parietal cells which secrete your stomach acid and a substance called intrinsic factor. Now-switch to your bone marrow which is where your red blood cells are made. In order for your red blood cells to mature in the bone marrow, vitamin B12 is necessary. B12 can only be obtained from animal food sources such as meat, milk and eggs. Unfortunately, B12 cannot be absorbed in the stomach without intrinsic factor. If there is sufficient B12 present in the diet, it can be stored in the liver. If you aren't eating enough animal sources your B12 will be taken from your liver until you run out. You could also be deficient in intrinsic factor. So while the outcome is anemia (not enough red blood cells) the problem could be from a few different things. Follow your doctor's recommendations and eat more sources of B12

136

Time Resolved X-ray Fine Structures, Neutron Emission, and Ion Velocities in a Fast 1 kJ Plasma Focus  

Science Journals Connector (OSTI)

One to four (mostly 2) X-ray spot structures are present in hydrogen and deuterium along the z-axis during the dense pinch phase; approximately 4% argon is required for soft radiation pin hole photography. Spo...

K. H. Schoenbach; L. Michel; H. Krompholz

1976-01-01T23:59:59.000Z

137

Molecular structure, NBO analysis, electronic absorption and vibrational spectral analysis of 2-Hydroxy-4-Methoxybenzophenone: Reassignment of fundamental modes  

Science Journals Connector (OSTI)

Abstract Vibrational frequencies of 2-Hydroxy-4-Methoxybenzophenone (HMB) have been reassigned with the aid of normal coordinate analysis (NCA) following the scaled quantum mechanical force field (SQMFF) methodology. The conformational analyses were performed and the energies of the different possible conformers were determined. The geometry of different conformers of the compounds were optimized with B3LYP method using 6-311++G(d,p) basis set to characterize all stationary points as minima. The optimized structural parameters of the most stable conformer were used in the vibrational frequency calculations. The force constants obtained from the B3LYP/6-311++G(d,p) method have been utilized in the normal coordinate analysis. The temperature dependence of the thermodynamic properties, heat capacity at constant pressure (Cp), entropy (S) and enthalpy change (?H) for the compound was also determined by B3LYP/6-311++G(d,p) method. The total electron density and Molecular electrostatic potential surfaces of the molecules were constructed by Natural Bond Orbital analysis using B3LYP/6-311++G(d,p) method to display electrostatic potential (electron+nuclei) distribution, molecular shape, size, and dipole moments of the molecule. The electronic properties, HOMO and LUMO energies were measured.

Lynnette Joseph; D. Sajan; K. Chaitanya; T. Suthan; N.P. Rajesh; Jayakumary Isac

2014-01-01T23:59:59.000Z

138

Continuous fine ash depressurization system  

DOE Patents (OSTI)

A system for depressurizing and cooling a high pressure, high temperature fine solid particles stream having entrained gas therein. In one aspect, the system has an apparatus for cooling the high pressure, high temperature fine solid particles stream having entrained gas therein and a pressure letdown device for depressurization by separating the cooled fine solid particles from a portion of the fine solid particles stream having entrained gas therein, resulting in a lower temperature, lower pressure outlet of solid particles for disposal or handling by downstream equipment.

Liu, Guohai (Birmingham, AL); Peng, Wan Wang (Birmingham, AL); Vimalchand, Pannalal (Birmingham, AL)

2011-11-29T23:59:59.000Z

139

Precision recording of near-edge profiles of x-ray absorption edges: an improved x-ray spectroscopy  

SciTech Connect

The intense, highly monochromatized X-ray beams available at the Cornell High Energy Synchroton Source facility permit one to plot the fine structure at absorption edges of elements with atomic number Z > 18. With the simple device described in this report, the authors have recorded distinctive features in absorption profiles, with a reproducibility better than +/- 50 meV for the major jumps, when measured with reference to a selected material, generally the metal. These spectra, which reflect locations of the upper states into which the photoelectrons are propelled, can be obtained without pretreatment of the sample (other than grinding to a fine powder) under ambient atmospheric conditions. Of course, spectra at low or high temperatures, under controlled atmospheres, can also be recorded with a more elaborative device. This technique complements information derived from electron energy loss spectroscopy and provides a fingerprint of modifications in the electronic structure of the element induced by the coordinating shell of surrounding atoms. It is a discriminating analytical probe for characterizing compositional changes in the first coordination shell around the selected atomic centers, due to processing of amorphous (or very finely divided) materials.

Chiu, N.S.; Bauer, S.H.

1988-08-01T23:59:59.000Z

140

A Laboratory-based Hard X-ray Monochromator for High-Resolution X-ray Emission Spectroscopy and X-ray Absorption Near Edge Structure Measurements  

E-Print Network (OSTI)

We report the development of a laboratory-based Rowland-circle monochromator that incorporates a low poer x-ray (bremsstrahlung) tube source, a spherically-bent crystal analyzer (SBCA), and an energy-resolving solid-state detector. This relatively inexpensive, introductory level instrument achieves 1-eV energy resolution for photon energies of 5 keV to 10 keV while also dmeonstrating a net efficiency previously seen only in laboratory monochromators having much coarser energy resolution. Despite the use of only a compact, air-cooled 10 W x-ray tube, we find count rates for nonresonant x-ray emission spectroscopy (XES) comparable to those achived at monochromatized spectroscopy beamlines at synchrotron light sources. For x-ray absorption near edge structure (XANES), the monochromatized flux is small (due to the use of a low-powered x-ray generator) but still useful for routine transmission-mode studies of concentrated samples. These results indicate that upgrading to a standard commercial high-powered line-foc...

Seidler, G T; Remesnik, A J; Pacold, J I; Ball, N A; Barry, N; Styczinski, M; Hoidn, O R

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "absorption fine structure" from the National Library of EnergyBeta (NLEBeta).
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141

Moments of Absorption.  

E-Print Network (OSTI)

??Moments of Absorption explores the conceptual and visual themes that are presented in my MFA thesis exhibition. The research looks into the absorption of the (more)

Kaufman, Sarah K.

2008-01-01T23:59:59.000Z

142

GALACTIC OUTFLOWS IN ABSORPTION AND EMISSION: NEAR-ULTRAVIOLET SPECTROSCOPY OF GALAXIES AT 1 < z < 2  

SciTech Connect

We study large-scale outflows in a sample of 96 star-forming galaxies at 1 {approx}< z {approx}< 2, using near-UV spectroscopy of Fe II and Mg II absorption and emission. The average blueshift of the Fe II interstellar absorption lines with respect to the systemic velocity is -85 {+-} 10 km s{sup -1} at z {approx} 1.5, with standard deviation 87 km s{sup -1}; this is a decrease of a factor of two from the average blueshift measured for far-UV interstellar absorption lines in similarly selected galaxies at z {approx} 2. The profiles of the Mg II {lambda}{lambda}2796, 2803 lines show much more variety than the Fe II profiles, which are always seen in absorption; Mg II ranges from strong emission to pure absorption, with emission more common in galaxies with blue UV slopes and at lower stellar masses. Outflow velocities, as traced by the centroids and maximum extent of the absorption lines, increase with increasing stellar mass with 2{sigma}-3{sigma} significance, in agreement with previous results. We study fine structure emission from Fe II*, finding several lines of evidence in support of the model in which this emission is generated by the re-emission of continuum photons absorbed in the Fe II resonance transitions in outflowing gas. In contrast, photoionization models indicate that Mg II emission arises from the resonant scattering of photons produced in H II regions, accounting for the differing profiles of the Mg II and Fe II lines. A comparison of the strengths of the Fe II absorption and Fe II* emission lines indicates that massive galaxies have more extended outflows and/or greater extinction, while two-dimensional composite spectra indicate that emission from the outflow is stronger at a radius of {approx}10 kpc in high-mass galaxies than in low-mass galaxies.

Erb, Dawn K. [Department of Physics, University of Wisconsin Milwaukee, Milwaukee, WI 53211 (United States); Quider, Anna M. [Institute of Astronomy, Madingley Road, Cambridge CB3 0HA (United Kingdom); Henry, Alaina L.; Martin, Crystal L., E-mail: erbd@uwm.edu, E-mail: aquider@gmail.com, E-mail: ahenry@physics.ucsb.edu, E-mail: cmartin@physics.ucsb.edu [Department of Physics, University of California Santa Barbara, Santa Barbara, CA 93106 (United States)

2012-11-01T23:59:59.000Z

143

Hot Gas Filtration of Fine and Ultra fine Particles with Liquid...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Hot Gas Filtration of Fine and Ultra fine Particles with Liquid Phase Sintered SiC Ceramic DPF Hot Gas Filtration of Fine and Ultra fine Particles with Liquid Phase Sintered SiC...

144

Structural and dynamical properties of Bridgman-grown CdSe[subscript x]Te[subscript 1?x] (0  

E-Print Network (OSTI)

Measurements of the Raman scattering and extended x-ray-absorption fine-structure (EXAFS) spectroscopy are reported on a series of Bridgman-grown zinc-blende CdTe[subscript 1?x]Se[subscript x] (0.35 ? x > 0.05) ternary ...

Talwar, Devki N.

145

Silicate absorption in heavily obscured galaxy nuclei  

E-Print Network (OSTI)

Spectroscopy at 8-13 microns with T-ReCS on Gemini-S is presented for 3 galaxies with substantial silicate absorption features, NGC 3094, NGC 7172 and NGC 5506. In the galaxies with the deepest absorption bands, the silicate profile towards the nuclei is well represented by the emissivity function derived from the circumstellar emission from the red supergiant, mu Cephei which is also representative of the mid-infrared absorption in the diffuse interstellar medium in the Galaxy. There is spectral structure near 11.2 microns in NGC 3094 which may be due to a component of crystalline silicates. In NGC 5506, the depth of the silicate absorption increases from north to south across the nucleus, suggestive of a dusty structure on scales of 10s of parsecs. We discuss the profile of the silicate absorption band towards galaxy nuclei and the relationship between the 9.7 micron silicate and 3.4 micron hydrocarbon absorption bands.

P. F. Roche; C. Packham; D. K. Aitken; R. E. Mason

2006-10-19T23:59:59.000Z

146

Oral Drug Absorption  

E-Print Network (OSTI)

properties ? membrane permeability ? metabolic stability ? enzyme inhibition or induction ? protein binding ? transporter affinity ?. Chemical Optimization DDS technology 4 Strategy of Drug Delivery Absorption Distribution Metabolism Excretion Improve of drug... absorption absorption enhancement controlled releasecontrolled release new administration route Drug targeting to the tissue to the cell to the organelle Dr. Shinji Yamashita (Setsunan University) Issue: Oral Drug Absorption Dr. Valentino J. Stella...

Yamashita, Shinji

2006-10-26T23:59:59.000Z

147

Trends in the Carbonyl Core (C 1S, O 1S) f *C)O Transition in the Near-Edge X-ray Absorption Fine Structure Spectra of Organic Molecules  

E-Print Network (OSTI)

,2 meteorites3 and interplanetary dust particles,4 eocene and recent wood,5,6 coal, coke, and other organic

148

Quick-scanning x-ray absorption spectroscopy system with a servo-motor-driven channel-cut monochromator with a temporal resolution of 10 ms  

SciTech Connect

We have developed a quick-scanning x-ray absorption fine structure (QXAFS) system and installed it at the recently constructed synchrotron radiation beamline BL33XU at the SPring-8. Rapid acquisition of high-quality QXAFS data was realized by combining a servo-motor-driven Si channel-cut monochromator with a tapered undulator. Two tandemly aligned monochromators with channel-cut Si(111) and Si(220) crystals covered energy ranges of 4.0-28.2 keV and 6.6-46.0 keV, respectively. The system allows the users to adjust instantly the energy ranges of scans, the starting angles of oscillations, and the frequencies. The channel-cut crystals are cooled with liquid nitrogen to enable them to withstand the high heat load from the undulator radiation. Deformation of the reflecting planes is reduced by clamping each crystal with two cooling blocks. Performance tests at the Cu K-edge demonstrated sufficiently high data quality for x-ray absorption near-edge structure and extended x-ray absorption fine-structure analyses with temporal resolutions of up to 10 and 25 ms, respectively.

Nonaka, T.; Dohmae, K.; Araki, T.; Hayashi, Y.; Hirose, Y. [Toyota Central R and D Labs., Inc., Nagakute, Aichi 480-1192 (Japan); Uruga, T.; Yamazaki, H.; Tanida, H.; Goto, S. [JASRI/Spring-8, 1-1-1, Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198 (Japan); Mochizuki, T. [JASRI/Spring-8, 1-1-1, Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198 (Japan); Toyama Corp., Zama, Kanagawa 228-0003 (Japan)

2012-08-15T23:59:59.000Z

149

X-ray absorption spectroscopy at the Ni-K edge in Stackhousia tryonii Bailey hyperaccumulator  

E-Print Network (OSTI)

X-ray absorption spectroscopy at the NiK edge inin vivo by micro x-ray absorption spectroscopy (XAS) at theNiK edge. Both x-ray absorption near edge structure and

Kachenko, A.

2009-01-01T23:59:59.000Z

150

HII Absorption Bill Erickson  

E-Print Network (OSTI)

HII Absorption Bill Erickson November 10, 2006 It would make all of the drift curve simulations.8 dB above the data. One reason for this might be HII absorption which is not modeled in simulations. There are a number of ways that one might try to estimate the absorption. One might use optical maps of HII

Ellingson, Steven W.

151

Development of a high-resolution soft x-ray (30--1500 eV) beamline at the Advanced Light Source and its use for the study of angle-resolved photoemission extended fine structure  

SciTech Connect

ALS Bending magnet beamline 9.3.2 is for high resolution spectroscopy, with circularly polarized light. Fixed included-angle SGM uses three gratings for 30--1500 eV photons; circular polarization is produced by an aperture for selecting the beam above or below the horizontal plane. Photocurrent from upper and lower jaws of entrance slit sets a piezoelectric drive feedback loop on the vertically deflecting mirror for stable beam. End station has a movable platform. With photomeission data from Stanford, structure of c(2{times}2)P/Fe(100) was determined using angle-resolved photoemission extended fine structure (ARPEFS). Multiple-scattering spherical-wave (MSSW) calculations indicate that P atoms adsorb in fourfold hollow sites 1.02A above the first Fe layer. Self-consistent-field X{alpha} scattered wave calculation confirm that the Fe{sub 1}-Fe{sub 2} space is contracted for S/Fe but not for P/Fe; comparison is made to atomic N and O on Fe(100). Final-state effects on ARPEFS curves used literature data from the S 1s and 2p core levels of c(2{times}2)S/Ni(001); a generalized Ramsauer-Townsend splitting is present in the 1s but not 2p data. An approximate method for analyzing ARPEFS data from a non-s initial state using only the higher-{ell} partial wave was tested successfully. ARPEFS data from clean surfaces were collected normal to Ni(111) (3p core levels) and 5{degree} off-normal from Cu(111)(3s, 3p). Fourier transforms (FT) resemble adsorbate systems, showing backscattering signals from atoms up to 4 layers below emitters. 3p FTs show scattering from 6 nearest neighbors in the same crystal layer as the emitters. MSSW calulation indicate that Cu 3p photoemission is mostly d-wave. FTs also indicate double-scattering and single-scattering from laterally distant atoms; calculations indicate that the signal is dominated by photoemission from the first 2 crystal layers.

Huff, W.R.A. [California Univ., Berkeley, CA (United States). Dept. of Chemistry]|[Lawrence Berkeley National Lab., CA (United States)

1996-02-01T23:59:59.000Z

152

Design of a continuous-flow reactor for in situ x-ray absorption spectroscopy of solids in supercritical fluids  

SciTech Connect

This paper presents the design and performance of a novel high-temperature and high-pressure continuous-flow reactor, which allows for x-ray absorption spectroscopy or diffraction in supercritical water and other fluids under high pressure and temperature. The in situ cell consists of a tube of sintered, polycrystalline aluminum nitride, which is tolerant to corrosive chemical media, and was designed to be stable at temperatures up to 500 deg. C and pressures up to 30 MPa. The performance of the reactor is demonstrated by the measurement of extended x-ray absorption fine structure spectra of a carbon-supported ruthenium catalyst during the continuous hydrothermal gasification of ethanol in supercritical water at 400 deg. C and 24 MPa.

Dreher, M.; De Boni, E.; Nachtegaal, M.; Wambach, J.; Vogel, F. [Paul Scherrer Institut, 5232 Villigen PSI (Switzerland)

2012-05-15T23:59:59.000Z

153

Transient Absorption Spectroscopy with Isolated Attosecond Pulses  

E-Print Network (OSTI)

viii Attosecond transient absorption instrument. . . . . .5.2.2 AbsorptionTransient absorption spectroscopy . . . . . . . . . . . .

Bell, Marie Justine

2013-01-01T23:59:59.000Z

154

Chapter 1 - The Impacts of X-Ray Absorption Spectroscopy on Understanding Soil Processes and Reaction Mechanisms  

SciTech Connect

During the last two decades, X-ray absorption spectroscopy (XAS) has developed into a mature technique for obtaining the speciation (e.g., oxidation state) and short-range structure of elements present in soils and sediments. XAS encompasses both X-ray absorption near-edge structure (XANES) spectroscopy and extended X-ray absorption fine structure (EXAFS) spectroscopy. XAS has a number of advantageous qualities for studying soils and sediments, which include elemental specificity, sensitivity to the local chemical and structural state of an element, and the ability to analyze materials in situ. This information allows accurate determination of oxidation state, type of nearest neighbors, coordination number, bond distance, and orbital symmetries of the X-ray absorbing element. In this review, we examine the application of a wide variety of synchrotron X-ray techniques to fundamental issues in environmental soil chemistry. Additionally, we examine the application of microfocused and time-resolved XAS to determine speciation (e.g., oxidation state and/or local coordination environment) and transformation kinetics of contaminants in heterogeneous environmental systems. During the last three decades, XAS has a played a critical role in furthering our understanding of a myriad of environmental systems and will continue to do so into the foreseeable future.

Ginder-Vogel, Matthew; Sparks, Donald L. (Delaware)

2011-11-17T23:59:59.000Z

155

Dense, finely, grained composite materials  

DOE Patents (OSTI)

Dense, finely grained composite materials comprising one or more ceramic phase or phase and one or more metallic and/or intermetallic phase or phases are produced by combustion synthesis. Spherical ceramic grains are homogeneously dispersed within the matrix. Methods are provided, which include the step of applying mechanical pressure during or immediately after ignition, by which the microstructures in the resulting composites can be controllably selected.

Dunmead, Stephen D. (Davis, CA); Holt, Joseph B. (San Jose, CA); Kingman, Donald D. (Danville, CA); Munir, Zuhair A. (Davis, CA)

1990-01-01T23:59:59.000Z

156

Auto-oligomerization and hydration of pyrrole revealed by x-ray absorption spectroscopy  

SciTech Connect

Near edge x-ray absorption fine structure (NEXAFS) spectra have been measured at the carbon and nitrogen K-edges of the prototypical aromatic molecule, pyrrole, both in the gas phase and when solvated in water, and compared with spectra simulated using a combination of classical molecular dynamics and first principles density functional theory in the excited state core hole approximation. The excellent agreement enabled detailed assignments. Pyrrole is highly reactive, particularly in water, and reaction products formed by the auto-oligomerization of pyrrole are identified. The solvated spectra have been measured at two different temperatures, indicating that the final states remain largely unaffected by both hydration and temperature. This is somewhat unexpected, since the nitrogen in pyrrole can donate a hydrogen bond to water.

Advanced Light Source; Schwartz, Craig P.; Uejio, Janel S.; Duffin, Andrew M.; England, Alice H.; Prendergast, David; Saykally, Richard J

2009-05-29T23:59:59.000Z

157

Ultraviolet absorption by interstellar gas near the LMC star HD 36402 in the interstellar bubble N51D  

SciTech Connect

We have studied ultraviolet high-dispersion IUE spectra of the LMC star HD 36402 in the nebulosity N51D. Apart from absorption due to Milky Way gas, we find four interstellar absorption components associated with the immediate surroundings of HD 36402. The absorption at 305 km/sup -1/ originates in low-density, n(e)roughly-equal0.1 cm/sup -3/, 10/sup 4/ K gas. At 280 km s/sup -1/, strong absroption from the excited fine-structure level of carbon points to densities n(e)>1 cm/sup -3/ at 10/sup 4/ K. The velocity and density structure agree with that derived from visual emission lines. Additional weak absorption by common interstellar ions is seen near 260 km s/sup -1/. From a fit to the observed Lv..cap alpha.. profile, it is found that there is N(H)roughly-equal10/sup 20.2/ cm/sup -2/ in front of HD 36402, while the large N(H)roughly-equal10/sup 21.3/ cm/sup -2/ from 21 cm data clearly places most of the neutral gas behind N51D. The fourth component near 270 km s/sup -1/ shows strong N V, C IV, and Si IV, more than is consistent with a wind-blown interstellar bubble; hence there is additional absorption outside the bubble. The overall pattern of absorbtion-line strengths suggests solar abundance ratios for the metals. The earlier evolution of the large stellar association LH 77 may have induced star formation leading to bright nebulosities around LH 77, one of them being the bubble N51D.

de Boer, K.S.; Nash, A.G.

1982-04-15T23:59:59.000Z

158

High-resolution coupled physics solvers for analysing fine-scale nuclear reactor design problems  

Science Journals Connector (OSTI)

...solvers for analysing fine-scale nuclear reactor design problems Vijay S. Mahadevan...analysis of current and future nuclear reactor models is being investigated...in radiation hydrodynamics, nuclear reactor analysis, fluid-structure...

2014-01-01T23:59:59.000Z

159

ARM - Measurement - Aerosol absorption  

NLE Websites -- All DOE Office Websites (Extended Search)

absorption absorption ARM Data Discovery Browse Data Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Measurement : Aerosol absorption The process in which radiation energy is retained by aerosols. Categories Aerosols Instruments The above measurement is considered scientifically relevant for the following instruments. Refer to the datastream (netcdf) file headers of each instrument for a list of all available measurements, including those recorded for diagnostic or quality assurance purposes. ARM Instruments AOS : Aerosol Observing System CSPHOT : Cimel Sunphotometer IAP : In-situ Aerosol Profiles (Cessna Aerosol Flights) PSAP : Particle Soot Absorption Photometer PASS : Photoacoustic Soot Spectrometer External Instruments OMI : Ozone Monitoring Instrument

160

Molecular absorption in transition region spectral lines  

E-Print Network (OSTI)

Aims: We present observations from the Interface Region Imaging Spectrograph (IRIS) of absorption features from a multitude of cool atomic and molecular lines within the profiles of Si IV transition region lines. Many of these spectral lines have not previously been detected in solar spectra. Methods: We examined spectra taken from deep exposures of plage on 12 October 2013. We observed unique absorption spectra over a magnetic element which is bright in transition region line emission and the ultraviolet continuum. We compared the absorption spectra with emission spectra that is likely related to fluorescence. Results: The absorption features require a population of sub-5000 K plasma to exist above the transition region. This peculiar stratification is an extreme deviation from the canonical structure of the chromosphere-corona boundary . The cool material is not associated with a filament or discernible coronal rain. This suggests that molecules may form in the upper solar atmosphere on small spatial scales...

Schmit, Donald; Ayres, Thomas; Peter, Hardi; Curdt, Werner; Jaeggli, Sarah

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "absorption fine structure" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

Seven-effect absorption refrigeration  

DOE Patents (OSTI)

A seven-effect absorption refrigeration cycle is disclosed utilizing three absorption circuits. In addition, a heat exchanger is used for heating the generator of the low absorption circuit with heat rejected from the condenser and absorber of the medium absorption circuit. A heat exchanger is also provided for heating the generator of the medium absorption circuit with heat rejected from the condenser and absorber of the high absorption circuit. If desired, another heat exchanger can also be provided for heating the evaporator of the high absorption circuit with rejected heat from either the condenser or absorber of the low absorption circuit. 1 fig.

DeVault, R.C.; Biermann, W.J.

1989-05-09T23:59:59.000Z

162

Seven-effect absorption refrigeration  

DOE Patents (OSTI)

A seven-effect absorption refrigeration cycle is disclosed utilizing three absorption circuits. In addition, a heat exchanger is used for heating the generator of the low absorption circuit with heat rejected from the condenser and absorber of the medium absorption circuit. A heat exchanger is also provided for heating the generator of the medium absorption circuit with heat rejected from the condenser and absorber of the high absorption circuit. If desired, another heat exchanger can also be provided for heating the evaporator of the high absorption circuit with rejected heat from either the condenser or absorber of the low absorption circuit.

DeVault, Robert C. (Knoxville, TN); Biermann, Wendell J. (Fayetteville, NY)

1989-01-01T23:59:59.000Z

163

Fine Particle Emissions from Combustion Systems  

NLE Websites -- All DOE Office Websites (Extended Search)

Fine Particle Emissions from Combustion Systems Fine Particle Emissions from Combustion Systems Speaker(s): Allen Robinson Date: November 11, 2005 - 12:00pm Location: 90-3122 Combustion systems such as motor vehicles and power plants are major sources of fine particulate matter. This talk describes some of the changes in fine particle emissions that occur as exhaust from combustion systems mix with background air. This mixing cools and dilutes the exhaust which influences gas-particle partitioning of semi-volatile species, the aerosol size distribution, and the fine particle mass. Dilution sampling is used to characterize fine particle emissions from combustion systems because it simulates the rapid cooling and dilution that occur as exhaust mixes with the atmosphere. Results from dilution sampler

164

Liquefaction characteristics of a fine sand  

E-Print Network (OSTI)

LIQUEFACTION CHARACTERISTICS OF A FINE SAND A Thesis by DONALD TIMOTHY BRANDON Submitted to the Graduate College of Texas A&M University in partial fulfillment of the requirement for the degree of MASTER OF SCIENCE May 1974 Major Subject...: Civil Engineering LIQUEFACTION CHARACTERISTICS OF A FINE SAND A Thesis by DONALD TIMOTHY BRANDON Approved as to style and content by: airman o Commi ee) ead of Depar ent) (Member) ( ber) ABSTRACT LIQUEFACTION CEARACTERISTICS OF A FINE SAND...

Brandon, Donald Timothy

2012-06-07T23:59:59.000Z

165

Synthesis, single-crystal structure, and optical absorption of Rb{sub 2}Th{sub 7}Se{sub 15}  

SciTech Connect

The compound Rb{sub 2}Th{sub 7}Se{sub 15} has been synthesized by the solid-state reaction at 1273 K of Th, Rb{sub 2}Se{sub 3}, Se, and Ge, and its structure has been determined by single-crystal X-ray diffraction methods. Red crystals of Rb{sub 2}Th{sub 7}Se{sub 15} crystallize at 100(2) K with four formula units in a new structure type in the monoclinic space group C{sub 2h}{sup 5}?P2{sub 1}/c. The structure is three-dimensional and comprises Rb and Th atoms coordinated by Se atoms to form nine-, eight-, and seven-coordinate polyhedra. Infinite channels that contain Rb atoms are present. Crystals of Rb{sub 2}Th{sub 7}Se{sub 15} are red in color; an indirect band gap of 1.83 eV was derived from single-crystal optical measurements. - Graphical abstract: Structure of Rb{sub 2}Th{sub 7}Se{sub 15} viewed down the b-axis. Display Omitted - Highlights: The new compound Rb{sub 2}Th{sub 7}Se{sub 15} was synthesized at 1273 K from the elements in the presence of Ge. The structures of the two known Rb/Th/Se compounds, RbTh{sub 2}Se{sub 6} and Rb{sub 2}Th{sub 7}Se{sub 15}, differ markedly. Optical measurements establish the band gap of Rb{sub 2}Th{sub 7}Se{sub 15} to be indirect with a value of 1.83 eV.

Koscielski, Lukasz A.; Pozzi, Eric A.; Van Duyne, Richard P.; Ibers, James A., E-mail: ibers@chem.northwestern.edu

2013-09-15T23:59:59.000Z

166

Multiphoton Absorption and Coherence  

Science Journals Connector (OSTI)

We study the probability for multiphoton absorption processes induced by both laser and thermal light acting on an atomic system. When the thermal radiation, suitably filtered, has the same frequency spectrum and the same total energy as the laser packet, we find that the ratio between the relative probabilities for s-photon absorption can be expressed by (4?)-12(s-1)s!s12(?c?)s-1, where ? is the time during which the atomic system is illuminated by thermal radiation with coherence time ?c. This shows that multiphoton absorption processes depend on the statistical properties of the incident light, and that the probability induced by the laser packet is certainly greater than that induced by the thermal light if s

S. Carusotto; G. Fornaca; E. Polacco

1968-01-25T23:59:59.000Z

167

Absorption-Line Spectroscopy of Planetary Nebulae with FUSE: Probing the Molecular, Atomic, and Ionized Gas  

E-Print Network (OSTI)

The central stars of planetary nebulae (PNe) are natural targets for FUSE due to their UV brightness. The FUSE spectra of many PNe show absorption features due to circumstellar material in species ranging from H_2 and neutrals in the photodissociation region (PDR) to ions resident in the H II region. We report results from a program designed to search for nebular components in the H_2 Lyman and Werner resonance lines that are responsible for the fluorescent excitation of H_2 in strong FUV radiation fields. Our failure to detect H_2 in absorption in several PNe with strong near-infrared H_2 emission indicates that the molecular material has an asymmetrical or clumpy distribution. We also detect enrichments in the s-process product Ge, find that Fe is not depleted into dust along at least one line of sight through a PN, and show that starlight fluorescence can affect the populations of the excited fine-structure levels of O I.

Harriet L. Dinerstein; N. C. Sterling; Charles W. Bowers

2004-10-25T23:59:59.000Z

168

Diamond sensors and polycapillary lenses for X-ray absorption spectroscopy  

SciTech Connect

Diamond sensors are evaluated as incident beam monitors for X-ray absorption spectroscopy experiments. These single crystal devices pose a challenge for an energy-scanning experiment using hard X-rays due to the effect of diffraction from the crystalline sensor at energies which meet the Bragg condition. This problem is eliminated by combination with polycapillary lenses. The convergence angle of the beam exiting the lens is large compared to rocking curve widths of the diamond. A ray exiting one capillary from the lens meets the Bragg condition for any reflection at a different energy from the rays exiting adjacent capillaries. This serves to broaden each diffraction peak over a wide energy range, allowing linear measurement of incident intensity over the range of the energy scan. Extended X-ray absorption fine structure data are measured with a combination of a polycapillary lens and a diamond incident beam monitor. These data are of comparable quality to data measured without a lens and with an ionization chamber monitoring the incident beam intensity.

Ravel, B. [National Institute of Standards and Technology, Gaithersburg, Maryland 20899 (United States)] [National Institute of Standards and Technology, Gaithersburg, Maryland 20899 (United States); Attenkofer, K. [Photon Sciences Division, Brookhaven National Laboratory, Upton, New York 11973-5000 (United States)] [Photon Sciences Division, Brookhaven National Laboratory, Upton, New York 11973-5000 (United States); Bohon, J. [Center for Synchrotron Biosciences, Case Western Reserve University, Cleveland, Ohio 44106 (United States)] [Center for Synchrotron Biosciences, Case Western Reserve University, Cleveland, Ohio 44106 (United States); Muller, E. [Department of Physics and Astronomy, Stony Brook University, Stony Brook, New York 11974-3800 (United States)] [Department of Physics and Astronomy, Stony Brook University, Stony Brook, New York 11974-3800 (United States); Smedley, J. [Instrumentation Division, Brookhaven National Laboratory, Upton, New York 11973-5000 (United States)] [Instrumentation Division, Brookhaven National Laboratory, Upton, New York 11973-5000 (United States)

2013-10-15T23:59:59.000Z

169

Physical features of small disperse coal dust fraction transportation and structurization processes in iodine air filters of absorption type in ventilation systems at nuclear power plants  

E-Print Network (OSTI)

The research on the physical features of transportation and structurization processes by the air-dust aerosol in the granular filtering medium with the cylindrical coal adsorbent granules in an air filter of the adsorption type in the heating ventilation and cooling (HVAC) system at the nuclear power plant is completed. The physical origins of the coal dust masses distribution along the absorber with the granular filtering medium with the cylindrical coal granules during the air-dust aerosol intake process in the near the surface layer of absorber are researched. The quantitative technical characteristics of air filtering elements, which have to be considered during the optimization of air filters designs for the application in the ventilation systems at the nuclear power plants, are obtained.

Ledenyov, Oleg P; Poltinin, P Ya; Fedorova, L I

2012-01-01T23:59:59.000Z

170

The Radio to Infrared Emission of Very High Redshift Gamma-Ray Bursts: Probing Early Star Formation through Molecular and Atomic Absorption Lines  

E-Print Network (OSTI)

We evaluate the broadband afterglow emission of very high redshift gamma-ray bursts (GRBs) using standard relativistic blastwave models with both forward and reverse shock components. For a broad range of parameters, a generic property for GRBs at redshifts $z \\sim$ 5--30 is that the emission peaks in the millimeter to far-infrared bands with milli-Jansky flux levels, first at a few hours after the burst due to the reverse shock, and then again for several days afterwards with somewhat lower flux due to the forward shock. The radio, submillimeter and infrared continuum emission should be readily detectable out to $z \\ga 30$ by the Atacama Large Millimeter Array (ALMA), Extended Very Large Array (EVLA), Square Kilometer Array (SKA) and other facilities. For relatively bright bursts, spectroscopic measurements of molecular and atomic absorption lines due to ambient protostellar gas may be possible. Utilizing models of primordial protostellar clouds, we show that under certain conditions, appreciable absorption may be caused by HD rotational transitions even in metal-free environments. After sufficient metal enrichment, absorption from CO rotational transitions and [OI] fine-structure transitions can also become strong. With appropriate observing strategies in combination with optical telescopes, ALMA and/or SKA may be able to detect such lines, offering a unique probe of physical conditions in individual Pop III and early Pop II star forming regions. We also remark on potential near-infrared absorption features due to electronic transitions of H$_2$.

Susumu Inoue; Kazuyuki Omukai; Benedetta Ciardi

2007-07-14T23:59:59.000Z

171

Formaldehyde Absorption toward W51  

SciTech Connect

We have measured formaldehyde (H{sub 2}CO) absorption toward the HII region complex W51A (G49.5-0.4) in the 6 cm and 2 cm wavelength rotational transitions with angular resolution of approximately 4 inch. The continuum HII region shows a large, previously undetected shell structure 5.5 pc along the major axis. We observe no H{sub 2}CO emission in regions of low continuum intensity. The absorption, converted to optical depth, shows a higher degree of clumping than previous maps at lower resolution. The good S/N of the maps allows accurate estimation of the complicated line profiles, showing some of the absorbing clouds to be quite patchy. We list the properties of the opacity spectra for a number of positions both in the clumps and in the more diffuse regions of the absorbing clouds, and derive column densities for the 1{sub 11} and 2{sub 12} rotational levels of ortho-formaldehyde.

Kogut, A.; Smoot, G.F.; Bennett, C.L.; Petuchowski, S.J.

1988-04-01T23:59:59.000Z

172

Characterization of atmospheric aerosols using Synchroton radiation total reflection X-ray fluorescence and Fe K-edge total reflection X-ray fluorescence-X-ray absorption near-edge structure  

Science Journals Connector (OSTI)

In this study a new procedure using Synchrotron total reflection X-ray fluorescence (SR-TXRF) to characterize elemental amounts in atmospheric aerosols down to particle sizes of 0.015 um is presented. The procedure was thoroughly evaluated regarding bounce off effects and blank values. Additionally the potential of total reflection X-ray fluorescenceX-ray absorption near edge structure (SR-TXRF-XANES) for speciation of FeII/III down to amounts of 34pg in aerosols which were collected for 1h is shown. The aerosols were collected in the city of Hamburg with a low pressure Berner impactor on Si carriers covered with silicone over time periods of 60 and 20min each. The particles were collected in four and ten size fractions of 10.08.0?m, 8.02.0?m, 2.00.13?m 0.130.015?m (aerodynamic particle size) and 1530nm, 3060nm, 60130nm, 130250nm, 250500nm, 0.51?m, 12?m, 24?m, 48?m, 816?m. Prior to the sampling bounce off effects on Silicone and Vaseline coated Si carriers were studied with total reflection X-ray fluorescence. According to the results silicone coated carriers were chosen for the analysis. Additionally, blank levels originating from the sampling device and the calibration procedure were studied. Blank levels of Fe corresponded to 110% of Fe in the aerosol samples. Blank levels stemming from the internal standard were found to be negligible. The results from the Synchroton radiation total reflection X-ray fluorescence analysis of the aerosols showed that 20min of sampling time gave still enough sample material for elemental determination of most elements. For the determination of the oxidation state of Fe in the aerosols different Fe salts were prepared as a reference from suspensions in isopropanol. The results from the Fe K-edge Synchroton radiation total reflection X-ray fluorescence-X-ray absorption near-edge structure analysis of the aerosol samples showed that mainly Fe(III) was present in all particle size fractions.

U.E.A. Fittschen; F. Meirer; C. Streli; P. Wobrauschek; J. Thiele; G. Falkenberg; G. Pepponi

2008-01-01T23:59:59.000Z

173

Plasmon absorption modulator systems and methods  

SciTech Connect

Plasmon absorption modulator systems and methods are disclosed. A plasmon absorption modulator system includes a semiconductor substrate, a plurality of quantum well layers stacked on a top surface of the semiconductor substrate, and a metal layer formed on a top surface of the stack of quantum well layers. A method for modulating plasmonic current includes enabling propagation of the plasmonic current along a metal layer, and applying a voltage across the stack of quantum well layers to cause absorption of a portion of energy of the plasmonic current by the stack of quantum well layers. A metamaterial switching system includes a semiconductor substrate, a plurality of quantum well layers stacked on a top surface of the semiconductor substrate, and at least one metamaterial structure formed on a top surface of the stack of quantum well layers.

Kekatpure, Rohan Deodatta; Davids, Paul

2014-07-15T23:59:59.000Z

174

Structural Determination of the Hydrophobic Hydration Shell of Kr  

Science Journals Connector (OSTI)

We report the first direct measurement by extended x-ray absorption fine structure spectroscopy of the hydrophobic hydration shell of the noble gas krypton. Measurements were made in aqueous solution at gas pressures in the range 20 to 100 bars and at a temperature of 320 K. Data of excellent quality were collected taking advantage of the high brilliance of a third generation synchrotron radiation source. An advanced data analysis procedure has been applied to determine the Kr-O partial radial distribution function in the short range.

Adriano Filipponi; Daniel T. Bowron; Colin Lobban; John L. Finney

1997-08-18T23:59:59.000Z

175

The Quantum Absorption Refrigerator  

E-Print Network (OSTI)

A quantum absorption refrigerator driven by noise is studied with the purpose of determining the limitations of cooling to absolute zero. The model consists of a working medium coupled simultaneously to hot, cold and noise baths. Explicit expressions for the cooling power are obtained for Gaussian and Poisson white noise. The quantum model is consistent with the first and second laws of thermodynamics. The third law is quantified, the cooling power J_c vanishes as J_c proportional to T_c^{alpha}, when T_c approach 0, where alpha =d+1 for dissipation by emission and absorption of quanta described by a linear coupling to a thermal bosonic field, where d is the dimension of the bath.

Amikam Levy; Ronnie Kosloff

2011-09-04T23:59:59.000Z

176

Immobilization of Rocky Flats Graphite Fines Residue  

SciTech Connect

The development of the immobilization process for graphite fines has proceeded through a series of experimental programs. The experimental procedures and results from each series of experiments are discussed in this report.

Rudisill, T.S.

1999-04-06T23:59:59.000Z

177

Geometry and Electronic Structure of Cl on the Cu {001} Surface  

Science Journals Connector (OSTI)

The atomic geometry of Cu{001}c(22)-Cl has been determined by surface extended x-ray-absorption fine structure to consist of a simple Cl overlayer in fourfold Cu hollows with a (2.37 0.02)- bond length. With use of this geometry, self-consistent electronic structure calculations were performed and compared with angle-resolved photoemission data, giving excellent agreement for the position and dispersion of several Cl-induced surface states and resonances. These results have resolved previously reported discrepancies for the Ag{001}c(22)-Cl system.

P. H. Citrin, D. R. Hamann, L. F. Mattheiss, and J. E. Rowe

1982-12-06T23:59:59.000Z

178

Optical absorption in amorphous silicon  

SciTech Connect

The role that disorder plays in shaping the form of the optical absorption spectrum of hydrogenated amorphous silicon is investigated. Disorder leads to a redistribution of states, which both reduces the Tauc gap and broadens the absorption tail. The observed relationship between the Tauc gap and the breadth of the absorption tail is thus explained.

O`Leary, S.K.; Zukotynski, S.; Perz, J.M.; Sidhu, L.S. [Univ. of Toronto, Ontario (Canada). Dept. of Electrical and Computer Engineering

1996-12-31T23:59:59.000Z

179

Swift heavy ion irradiation of Pt nanocrystals: II. Structural changes and H desorption  

SciTech Connect

The structural properties and H desorption from embedded Pt nanocrystals (NCs) following irradiation with swift heavy ions were investigated as a function of energy and fluence. From x-ray absorption near-edge spectroscopy analysis, Pt-H bonding was identified in NCs annealed in a forming gas (95% N{sub 2} + 5% H{sub 2}) ambient. The H content decreased upon irradiation and the desorption process was NC-size dependent such that larger NCs required a higher fluence to achieve a H-free state. Pt-H bonding and NC dissolution both perturbed the NC structural parameters (coordination number, bond-length and mean-square relative displacement) as determined with extended x-ray absorption fine structure measurements.

Giulian, R.; Araujo, L.L.; Kluth, P.; Sprouster, D.J.; Schnohr, C.S.; Byrne, A.P.; Ridgway, M.C. (ANU)

2014-09-24T23:59:59.000Z

180

VARIOUS APPLICATIONS OF ZEEMAN ATOMIC ABSORPTION SPECTROSCOPY  

E-Print Network (OSTI)

APPLICATIONS OF ZEEMAN ATOMIC ABSORPTION SPECTROSCOPYthe Zeeman effect to atomic absorption spectroscopy has beenthe Zeeman effect on atomic absorption spectrometry has been

Koizumi, Hideaki

2011-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "absorption fine structure" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

Moisture absorption modeling using design of experiments  

E-Print Network (OSTI)

Moisture Absorption Modeling Using Design of Experimentssurface pro?les of moisture absorption for the two laminatetheir amounts of moisture absorption are different. The

Yong, Virginia; Hahn, H. Thomas

2006-01-01T23:59:59.000Z

182

Development of an Advanced Fine Coal Suspension Dewatering Process  

SciTech Connect

With the advancement in fine coal cleaning technology, recovery of fine coal (minus 28 mesh) has become an attractive route for the U.S. coal industry. The clean coal recovered using the advanced flotation technology i.e. column flotation, contains on average 20% solids and 80% water, with an average particle size of 35 microns. Fine coal slurry is usually dewatered using a vacuum dewatering technique, providing a material with about 25 to 30 percent moisture. The process developed in this project will improve dewatering of fine (0.6mm) coal slurry to less than 20 percent moisture. Thus, thermal drying of dewatered wet coal will be eliminated. This will provide significant energy savings for the coal industry along with some environmental benefits. A 1% increase in recovery of coal and producing a filter cake material of less than 20 % moisture will amount to energy savings of 1900 trillion Btu/yr/unit. In terms of the amount of coal it will be about 0.8% of the total coal being used in the USA for electric power generation. It is difficult to dewater the fine clean coal slurry to about 20% moisture level using the conventional dewatering techniques. The finer the particle, the larger the surface area and thus, it retains large amounts of moisture on the surface. The coal industry has shown some reluctance in using the advanced coal recovery techniques, because of unavailability of an economical dewatering technique which can provide a product containing less than 20% moisture. The U.S.DOE and Industry has identified the dewatering of coal fines as a high priority problem. The goal of the proposed program is to develop and evaluate a novel two stage dewatering process developed at the University of Kentucky, which involves utilization of two forces, namely, vacuum and pressure for dewatering of fine coal slurries. It has been observed that a fine coal filter cake formed under vacuum has a porous structure with water trapped in the capillaries. When this porous cake is subjected to pressure for a short time, the free water present is released from the filter cake. Laboratory studies have shown that depending on the coal type a filter cake containing about 15% moisture could be obtained using the two-stage filtration technique. It was also noted that applying intermittent breaks in vacuum force during cake formation, which disturbed the cake structure, helped in removing moisture from the filter cakes. In this project a novel approach of cleaning coal using column flotation was also developed. With this approach the feed capacity of the column is increased significantly, and the column was also able to recover coarser size coal which usually gets lost in the process. The outcome of the research benefits the coal industry, utility industry, and indirectly the general public. The benefits can be counted in terms of clean energy, cleaner environment, and lower cost power.

B. K. Parekh; D. P. Patil

2008-04-30T23:59:59.000Z

183

Antiproton Absorption in Nuclei  

E-Print Network (OSTI)

We present the analysis of experimental data on forward antiproton production on nuclei. The calculations are done in the framework of a folding model which takes properly into account both incoherent direct proton-nucleon and cascade pion-nucleon antiproton production processes as well as internal nucleon momentum distribution. The effective antiproton-nucleon cross section in nuclear matter and the imaginary part of the antiproton nuclear optical potential are estimated to be 25-45 mb and -(38-56) MeV at normal nuclear matter density, respectively. The results of the performed analysis evidence for the decreasing of antiproton absorption in the nuclear medium.

Yu. T. Kiselev; E. Ya. Paryev

2006-01-11T23:59:59.000Z

184

Molecular Structure and Absorption Spectra of Carotenoids  

Science Journals Connector (OSTI)

......Benz J. Helv. Chim. Acta (1948) 31:1048. 36) Karrer P. , Benz J. Helv. Chim. Acta (1948) 31:1607. 37) Tappi G. , Karrer P. Helv. Chim. Acta (1949) 32:50. 38) Karrer P. , Benz J. Helv. Chim. Acta (1949) 32:232. 39......

Gentaro Araki; Tomokazu Murai

1952-12-01T23:59:59.000Z

185

Electrical Conductivity, Near-Infrared Absorption, and Thermal Lens Spectroscopic Studies of Percolation of Microemulsions  

E-Print Network (OSTI)

Electrical Conductivity, Near-Infrared Absorption, and Thermal Lens Spectroscopic Studies studied below and above the percolation thresholds by electrical conductivity, near-infrared absorption. In this work the structure of microemulsions was investigated by using the near-IR absorption and thermal lens

Reid, Scott A.

186

Direct and quantitative photothermal absorption spectroscopy of individual particulates  

SciTech Connect

Photonic structures can exhibit significant absorption enhancement when an object's length scale is comparable to or smaller than the wavelength of light. This property has enabled photonic structures to be an integral component in many applications such as solar cells, light emitting diodes, and photothermal therapy. To characterize this enhancement at the single particulate level, conventional methods have consisted of indirect or qualitative approaches which are often limited to certain sample types. To overcome these limitations, we used a bilayer cantilever to directly and quantitatively measure the spectral absorption efficiency of a single silicon microwire in the visible wavelength range. We demonstrate an absorption enhancement on a per unit volume basis compared to a thin film, which shows good agreement with Mie theory calculations. This approach offers a quantitative approach for broadband absorption measurements on a wide range of photonic structures of different geometric and material compositions.

Tong, Jonathan K.; Hsu, Wei-Chun; Eon Han, Sang; Burg, Brian R.; Chen, Gang, E-mail: gchen2@mit.edu [Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)] [Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States); Zheng, Ruiting [Key Laboratory of Radiation Beam Technology and Materials Modification of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875 (China)] [Key Laboratory of Radiation Beam Technology and Materials Modification of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875 (China); Shen, Sheng [Department of Mechanical Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213 (United States)] [Department of Mechanical Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213 (United States)

2013-12-23T23:59:59.000Z

187

The Use of UVVis Absorption Spectroscopy for Studies of Natively Disordered Proteins  

Science Journals Connector (OSTI)

Absorption spectroscopy can be used to monitor structural changes upon transitions from ordered to disordered state in proteins. Changes in environment of tryptophan, tyrosine,...

Eugene A. Permyakov

2012-01-01T23:59:59.000Z

188

Polarized x-ray-absorption spectroscopy of the uranyl ion: Comparison of experiment and theory  

SciTech Connect

The x-ray linear dichroism of the uranyl ion (UO{sub 2}{sup 2+}) in uranium {ital L}{sub 3}-edge extended x-ray-absorption fine structure (EXAFS), and {ital L}{sub 1}- and {ital L}{sub 3}-edge x-ray-absorption near-edge structure (XANES), has been investigated both by experiment and theory. A striking polarization dependence is observed in the experimental XANES and EXAFS for an oriented single crystal of uranyl acetate dihydrate [UO{sub 2}(CH{sub 3}CO{sub 2}){sub 2}{center_dot}2H{sub 2}O], with the x-ray polarization vector aligned either parallel or perpendicular to the bond axis of the linear uranyl cation (O-U-O). Single-crystal results are compared to experimental spectra for a polycrystalline uranyl acetate sample and to calculations using the {ital ab} {ital initio} multiple-scattering (MS) code FEFF 6. Theoretical XANES spectra for uranyl fluoride (UO{sub 2}F{sub 2}) reproduce all the features of the measured uranyl acetate spectra. By identifying scattering paths which contribute to individual features in the calculated spectrum, a detailed understanding of the {ital L}{sub 1}-edge XANES is obtained. MS paths within the uranyl cation have a notable influence upon the XANES. The measured {ital L}{sub 3}-edge EXAFS is also influenced by MS, especially when the x-ray polarization is parallel to the uranyl species. These MS contributions are extracted from the total EXAFS and compared to calculations. The best agreement with the isolated MS signal is obtained by using nonoverlapped muffin-tin spheres in the FEFF 6 calculation. This contrasts the {ital L}{sub 1}-edge XANES calculations, in which overlapping was required for the best agreement with experiment. {copyright} {ital 1996 The American Physical Society.}

Hudson, E.A.; Allen, P.G.; Terminello, L.J. [Glenn T. Seaborg Institute for Transactinium Science, Lawrence Livermore National Laboratory, University of California, Livermore, California 94551 (United States)] [Glenn T. Seaborg Institute for Transactinium Science, Lawrence Livermore National Laboratory, University of California, Livermore, California 94551 (United States); Denecke, M.A.; Reich, T. [Institut fuer Radiochemie, Forschungszentrum Rossendorf, Postfach 510119, D-01314 Dresden (Germany)] [Institut fuer Radiochemie, Forschungszentrum Rossendorf, Postfach 510119, D-01314 Dresden (Germany)

1996-07-01T23:59:59.000Z

189

Effective design for absorption and stripping  

SciTech Connect

Absorption and stripping transfer one or more constituents from a gas stream to a liquid stream (absorption) or from a liquid stream to a gas stream (strippling). Both are widely used in the process industries, for product manufacture and environmental protection alike. They are most often carried out counter currently in packed towers. The aim here is not to reproduce absorption and stripping theory, adequately given elsewhere. Instead, the authors offer practical, often overlooked guidelines and key equations for effective design of packed absorption or stripping towers. The design task consists mainly of two interrelated parts: the hydraulic design and the mass transfer design. Hydraulic design determines the tower diameter; the mass transfer design sets the packed height within the tower. A third basic consideration is the type and size of packing. If these are not given beforehand, the designer should select a packing for which hydraulic and mass-transfer data are available, and which falls in the 1-to-2-in. nominal size range for random packing (which includes over 90% of all applications) or has nominal 1/2-in. crimp height for structured packing.

McNulty, K.J. (Koch Engineering Co., Wilmington, MA (United States))

1994-11-01T23:59:59.000Z

190

Absorption Heat Pump Water Heater  

NLE Websites -- All DOE Office Websites (Extended Search)

Absorption Heat Pump Water Heater Absorption Heat Pump Water Heater Kyle Gluesenkamp Building Equipment Group, ETSD gluesenkampk@ornl.gov 865-241-2952 April 3, 2013 CRADA - GE Development of High Performance Residential Gas Water Heater Image courtesy John Wilkes 2 | Building Technologies Office eere.energy.gov Purpose & Objectives Problem Statement: Absorption technology could greatly boost water heater efficiency, but faces barriers of high first cost and working fluid challenges. Impact of Project: Energy factor of gas storage water

191

Absorption Heat Pump Water Heater  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Absorption Heat Pump Water Heater Absorption Heat Pump Water Heater Kyle Gluesenkamp Building Equipment Group, ETSD gluesenkampk@ornl.gov 865-241-2952 April 3, 2013 CRADA - GE Development of High Performance Residential Gas Water Heater Image courtesy John Wilkes 2 | Building Technologies Office eere.energy.gov Purpose & Objectives Problem Statement: Absorption technology could greatly boost water heater efficiency, but faces barriers of high first cost and working fluid challenges. Impact of Project: Energy factor of gas storage water

192

Absorption Spectra and Plotting Exciton Wavefunctions BerkeleyGW Workshop  

NLE Websites -- All DOE Office Websites (Extended Search)

Hands on Session 5: Converging Hands on Session 5: Converging Absorption Spectra and Plotting Exciton Wavefunctions BerkeleyGW Workshop 11/23/2013 Diana Qiu Converging Absorption General Parameters: ● K-grid sampling (WFN_fi, WFNq_fi) - Generally need to be finer when excitons are localized in k-space ● Number of valence bands and conduction bands (eqp.dat) - Needs to capture all the transitions in the energy range of interest Parameters Particular to BGW: ● Coarse k-grid (WFN_co, same as for epsilon) - Need to be fine enough to capture correct screening ● Number of coarse grid bands used in interpolation (eqp_co.dat) - Interpolation quality reported in dcc_mat.dat and dvv_mat.dat files Plotting Exciton Wavefunctions ● Plotxct.x calculates the exciton wavefunction in real-space with the

193

Ultrasonic absorption in liquid mixtures  

E-Print Network (OSTI)

, It is obvious that much moxe experimental dates both absorption snd thermalv is needed before this theory can be substantiated Purpose of the Investigation Ths present research was undertaken to investigate thoroughly ths absorption in mixtuxws of ethanol... Agricultural and lheohaaioal College of %nas ia partial fulfi&went of tbs aequtreaante for the daggse of ~t %53 ~or Sub)eot Pllgedss Table of Contents Ii Beokgxeund snd Theory Absorption in Pure Liqu1ds 8, Absorpt1on in Idquid Bixtures XI Purpose...

Davis, James Madison

2012-06-07T23:59:59.000Z

194

System for utilizing oil shale fines  

DOE Patents (OSTI)

A system is provided for utilizing fines of carbonaceous materials such as particles or pieces of oil shale of about one-half inch or less diameter which are rejected for use in some conventional or prior surface retorting process, which obtains maximum utilization of the energy content of the fines and which produces a waste which is relatively inert and of a size to facilitate disposal. The system includes a cyclone retort (20) which pyrolyzes the fines in the presence of heated gaseous combustion products, the cyclone retort having a first outlet (30) through which vapors can exit that can be cooled to provide oil, and having a second outlet (32) through which spent shale fines are removed. A burner (36) connected to the spent shale outlet of the cyclone retort, burns the spent shale with air, to provide hot combustion products (24) that are carried back to the cyclone retort to supply gaseous combustion products utilized therein. The burner heats the spent shale to a temperature which forms a molten slag, and the molten slag is removed from the burner into a quencher (48) that suddenly cools the molten slag to form granules that are relatively inert and of a size that is convenient to handle for disposal in the ground or in industrial processes.

Harak, Arnold E. (Laramie, WY)

1982-01-01T23:59:59.000Z

195

Arthur Fine Bohrs Response to EPR: Criticism  

E-Print Network (OSTI)

Arthur Fine Bohrs Response to EPR: Criticism and Defense If a specific question has meaning of focus that Niels Bohr makes in responding to EPR.1 EPR appeal to measurement as sometimes sufficient ("elements of reality"). In his response, Bohr, while paraphrasing thewordsofEPR

Fine, Arthur

196

700:20131001.1211 Fine Sun Sensor  

E-Print Network (OSTI)

700:20131001.1211 Fine Sun Sensor The Laboratory for Atmospheric and Space Physics (LASP) at the University of Colorado, Boulder is a world leader in space-based research including measurements of the Sun with respect to sun center. LASP has built sun position sensors for decades beginning with sensors for sub

Mojzsis, Stephen J.

197

Balmer Absorption Lines in FeLoBALs  

E-Print Network (OSTI)

We discovered non-stellar Balmer absorption lines in two many-narrow-trough FeLoBALs (mntBALs) by the near-infrared spectroscopy with Subaru/CISCO. Presence of the non-stellar Balmer absorption lines is known to date only in the Seyfert galaxy NGC 4151, thus our discovery is the first cases for quasars. Since all known active galactic nuclei with Balmer absorption lines share characteristics, it is suggested that there is a population of BAL quasars which have unique structures at their nuclei or unique evolutionary phase.

K. Aoki; I. Iwata; K. Ohta; N. Tamura; M. Ando; M. Akiyama; G. Kiuchi; K. Nakanishi

2006-12-14T23:59:59.000Z

198

Eta absorption by mesons  

E-Print Network (OSTI)

Using the $[SU(3)_{\\mathrm{L}} \\times SU(3)_{\\mathrm{R}}]_{\\mathrm{global}% }\\times [SU(3)_V]_{\\mathrm{local}}$ chiral Lagrangian with hidden local symmetry, we evaluate the cross sections for the absorption of eta meson ($% \\eta$) by pion ($\\pi$), rho ($\\rho$), omega ($\\omega$), kaon ($K$), and kaon star ($K^*$) in the tree-level approximation. With empirical masses and coupling constants as well as reasonable values for the cutoff parameter in the form factors at interaction vertices, we find that most cross sections are less than 1 mb, except the reactions $\\rho\\eta\\to K\\bar K^*(\\bar KK^*)$, $\\omega\\eta\\to K\\bar K^*(\\bar KK^*)$, $K^*\\eta\\to\\rho K$, and $K^*\\eta\\to\\omega K$, which are a few mb, and the reactions $\\pi\\eta\\to K\\bar K$ and $K\\eta\\to\\pi K$, which are more than 10 mb. Including these reactions in a kinetic model based on a schematic hydrodynamic description of relativistic heavy ion collisions, we find that the abundance of eta mesons likely reaches chemical equilibrium with other hadrons in nuclear collisions at the Relativistic Heavy Ion Collider.

W. Liu; C. M. Ko; L. W. Chen

2005-05-27T23:59:59.000Z

199

TECHNIQUES FOR THE STUDY OF THE STRUCTURAL PROPERTIES.  

SciTech Connect

The evolution of our understanding of the behavior of oxide nanostructures depends heavily on the structural information obtained from a wide range of physical methods traditionally used in solid state physics, surface science and inorganic chemistry. In this chapter, we describe several techniques that are useful for the characterization of the structural properties of oxide nanostructures: X-ray diffraction (XRD) and scattering, X-ray absorption fine structure (XAFS), Raman spectroscopy, transmission electron microscopy (TEM), scanning tunneling microscopy (STM) and atomic force microscopy (AFM). The ultimate goal is to obtain information about the spatial arrangement of atoms in the nanostructures with precise interatomic distances and bond angles. This may not be possible for complex systems and one may get only partial information about the local geometry or morphology.

FERNANDEZ-GARCIA, M.; RODRIGUEZ, J.A.; MARTINEZ-ARIAS, A.; HANSON, J.C.

2006-06-30T23:59:59.000Z

200

Achieving progressive fine granularity scalable coding in H.26L  

E-Print Network (OSTI)

Fine granularity scalable (FGS) coding and progressive fine granularity scalable (PFGS) coding are novel scalable video schemes which are ideally suited for streaming multimedia over networks with varying bandwidth, network conditions and receiver...

Shanmugampillai, Muthukumar

2012-06-07T23:59:59.000Z

Note: This page contains sample records for the topic "absorption fine structure" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

Reproductive Efficiency of Fine-Wool Sheep.  

E-Print Network (OSTI)

B-1050 MAY 1966 REPRODUCTIVE EFFICIENCY OF FIN 'E-WOOL SHEEP TEXAS A&M UNIVERSITY TEXAS AGRICULTURAL EXPERIMENT STATION R. E. Patterson, Director, College Station, Texas CONTENTS... or adverse weather conditions at lambing, Lack of culling for reproductive efficiency. Reproductive Efficiency of Fine-wool Sheep Aiaurice Shelton, John T. Morrow and 0. D. Butler* $pectively, geneticist, Livestock and Forage Research Center, hlc...

Shelton, Maurice; Morrow, John T.; Butler, O. D.

1966-01-01T23:59:59.000Z

202

Synthesis of fine-grained TATB  

DOE Patents (OSTI)

A method for producing fine-grained triamino-trinitrobenzene (TATB) powders having improved detonation-spreading performance and hence increased shock sensitivity when compared with that for ultrafine TATB is described. A single-step, sonochemical amination of trichloro-trinitrobenzene using ammonium hydroxide solution in a sealed vessel yields TATB having approximately 6 .mu.m median particle diameter and increased shock sensitivity.

Lee, Kien-Yin (Santa Fe, NM); Kennedy, James E. (Santa Fe, NM)

2003-04-15T23:59:59.000Z

203

Filtratin and dewatering of fine coal  

SciTech Connect

A fundamental study on filtration and dewatering of fine coal is described. Experiments are being conducted in three areas: (1) the microscopic analysis of filter cakes; (2) the measurement of equilibrium desaturation; and (3) the determination of filtration and dewatering rates. Preliminary experimental results are presented together with some observations on the microstructure of filter cakes. A three dimensional network model has also been developed and is being used to analyze experimental data. 10 figures, 2 tables.

Gala, H.B.; Kakwani, R.; Chiang, S.H.; Tierney, J.W.; Klinzing, G.E.

1981-01-01T23:59:59.000Z

204

Absorption properties of identical atoms  

SciTech Connect

Emission rates and other optical properties of multi-particle systems in collective and entangled states differ from those in product ones. We show the existence of similar effects in the absorption probabilities for (anti)symmetrized states of two identical atoms. The effects strongly depend on the overlapping between the atoms and differ for bosons and fermions. We propose a viable experimental verification of these ideas. -- Highlights: The absorption rates of a pair of identical atoms in product and (anti)symmetrized states are different. The modifications of the optical properties are essentially determined by the overlapping between the atoms. The absorption properties differ, in some cases, for bosons and fermions.

Sancho, Pedro, E-mail: psanchos@aemet.es

2013-09-15T23:59:59.000Z

205

Microwave absorptions of ultrathin conductive films and designs of frequency-independent ultrathin absorbers  

SciTech Connect

We study the absorption properties of ultrathin conductive films in the microwave regime, and find a moderate absorption effect which gives rise to maximal absorbance 50% if the sheet (square) resistance of the film meets an impedance matching condition. The maximal absorption exhibits a frequency-independent feature and takes place on an extremely subwavelength scale, the film thickness. As a realistic instance, ?5 nm thick Au film is predicted to achieve the optimal absorption. In addition, a methodology based on metallic mesh structure is proposed to design the frequency-independent ultrathin absorbers. We perform a design of such absorbers with 50% absorption, which is verified by numerical simulations.

Li, Sucheng; Anwar, Shahzad; Lu, Weixin; Hang, Zhi Hong; Hou, Bo, E-mail: houbo@suda.edu.cn, E-mail: phyhoubo@gmail.com; Shen, Mingrong [School of Physical Science and Technology, Soochow University, 1 Shizi Street, Suzhou 215006 (China)] [School of Physical Science and Technology, Soochow University, 1 Shizi Street, Suzhou 215006 (China); Wang, Chin-Hua [Institute of Modern Optical Technologies and Collaborative Innovation Center of Suzhou Nano Science and Technology, Jiangsu Key Lab of Advanced Optical Manufacturing Technologies, Soochow University, 1 Shizi Street, Suzhou 215006 (China)] [Institute of Modern Optical Technologies and Collaborative Innovation Center of Suzhou Nano Science and Technology, Jiangsu Key Lab of Advanced Optical Manufacturing Technologies, Soochow University, 1 Shizi Street, Suzhou 215006 (China)

2014-01-15T23:59:59.000Z

206

Numerical models of sunspot formation and fine structure  

Science Journals Connector (OSTI)

...Center for Atmospheric Research...On the large scale, they...Progress in this area thrives from...magnetized plasma, and therefore...of local thermal equilibrium...that the frequency dependence...physics such as non-local thermodynamic...substantially larger amount of...the rising plasma, regardless...manifest in thermal and velocity...a rather large perturbation...observed frequency dependence...Center for Atmospheric Research...

2012-01-01T23:59:59.000Z

207

The rediscovery of absorption chillers  

SciTech Connect

Absorption chillers are back - and for two very good reasons: they are environmentally sound and, in many cases, economically attractive. One factor fueling this resurgence is the outlook for natural gas, the energy source of most absorption systems. Deregulation has spurred exploration, and forecasts indicate an abundant supply and relatively low prices through 2050. Threats of global warming and depletion of the ozone layer also are forces driving the absorption chiller market. Being a good corporate citizen today means minimizing or eliminating the use of chlorofluorocarbons (CFCs), the basis of many refrigerants used in mechanical chillers. Even as chemical and chiller manufacturers alike work to develop substitute refrigerants, the perfect alternative has yet to be found. Absorption units are free of these problems, a benefit that appeals to many people.

Katzel, J.

1992-04-23T23:59:59.000Z

208

Radiative muon absorption in oxygen  

Science Journals Connector (OSTI)

The photon spectrum from radiative absorption of negative muons in O16 has been measured with a high-resolution pair spectrometer. The integrated branching ratio for photons with energies greater than 57 MeV relative to the total muon absorption rate is (3.80.4)10-5. The data are consistent with nuclear model calculations for a value of the induced pseudoscalar coupling in O16 of gP/gA=13.51.5.

A. Frischknecht; M. Dbeli; W. Stehling; G. Strassner; P. Trul; J. C. Alder; C. Joseph; J. F. Loude; J. P. Perroud; D. Ruegger; M. T. Tran; H. Panke

1988-11-01T23:59:59.000Z

209

Optical Absorption Spectrum of AgF  

Science Journals Connector (OSTI)

The optical absorption of thin films of silver monofluoride has been investigated in the visible and ultraviolet region of the spectrum at room and low temperatures. Exciton peaks have been observed at 4.63 and 6.34 eV for samples at 4.8 K. The first exciton peak is considerably lower in energy than might be expected on the basis of the trend set by the other silver halides. This unusually low energy has led us to speculate that the band structure of AgF may be quite different from those of the other silver halides.

Alfred P. Marchetti and G. L. Bottger

1971-04-15T23:59:59.000Z

210

Modeling of Powder Absorption in Additive Manufacturing  

Science Journals Connector (OSTI)

We have investigated optical absorption by a powder of metal spheres, via ray-trace calculations. The absorptivity significantly exceeds that for normal incidence, because of multiple...

Boley, Charles; Khairallah, Saad; Rubenchik, Alexander M

211

Photon interference effect in x-ray absorption spectra over a wide energy range Y. Nishino and T. Ishikawa  

E-Print Network (OSTI)

. Therefore the atomic absorption coeffi- cient a is given by a a PI a ES a Incoh , 1 where a PI , a ESPhoton interference effect in x-ray absorption spectra over a wide energy range Y. Nishino and T Received 3 July 2002; published 12 September 2002 We consider fundamental structures in x-ray absorption

Korecki, Pawe³

212

Immobilization of Rocky Flats Graphite Fines Residues  

SciTech Connect

The Savannah River Technology Center (SRTC) is developing an immobilization process for graphite fines residues generated during nuclear materials production activities at the Rocky Flats Environmental Technology Site (Rocky Flats). The continued storage of this material has been identified as an item of concern. The residue was generated during the cleaning of graphite casting molds and potentially contains reactive plutonium metal. The average residue composition is 73 wt percent graphite, 15 wt percent calcium fluoride (CaF2), and 12 wt percent plutonium oxide (PuO2). Approximately 950 kilograms of this material are currently stored at Rocky Flats. The strategy of the immobilization process is to microencapsulate the residue by mixing with a sodium borosilicate (NBS) glass frit and heating at nominally 700 degrees C. The resulting waste form would be sent to the Waste Isolation Pilot Plant (WIPP) for disposal. Since the PuO2 concentration in the residue averages 12 wt percent, the immobilization process was required to meet the intent of safeguards termination criteria by limiting plutonium recoverability based on a test developed by Rocky Flats. The test required a plutonium recovery of less than 4 g/kg of waste form when a sample was leached using a nitric acid/CaF2 dissolution flowsheet. Immobilization experiments were performed using simulated graphite fines with cerium oxide (CeO2) as a surrogate for PuO2 and with actual graphite fines residues. Small-scale surrogate experiments demonstrated that a 4:1 frit to residue ratio was adequate to prevent recovery of greater than 4 g/kg of cerium from simulated waste forms. Additional experiments investigated the impact of varying concentrations of CaF2 and the temperature/heating time cycle on the cerium recovery. Optimal processing conditions developed during these experiments were subsequently demonstrated at full-scale with surrogate materials and on a smaller scale using actual graphite fines.In general, the recovery of cerium from the full-scale waste forms was higher than for smaller scale experiments. The presence of CaF2 also caused a dramatic increase in cerium recovery not seen in the small-scale experiments. However, the results from experiments with actual graphite fines were encouraging. A 4:1 frit to residue ratio, a temperature of 700 degrees C, and a 2 hr heating time produced waste forms with plutonium recoveries of 4 plus/minus 1 g/kg. With an increase in the frit to residue ratio, waste forms fabricated at this scale should meet the Rocky Flats product specification. The scale-up of the waste form fabrication process to nominally 3 kg is expected to require a 5:1 to 6:1 frit to residue ratio and maintaining the waste form centerline temperature at 700 degrees C for 2 hr.

Rudisill, T. S.

1998-11-06T23:59:59.000Z

213

NETL: Pressure Swing Absorption Device  

NLE Websites -- All DOE Office Websites (Extended Search)

Pressure Swing Absorption Device and Process for Separating CO2 from Shifted Syngas and its Capture for Subsequent Storage Pressure Swing Absorption Device and Process for Separating CO2 from Shifted Syngas and its Capture for Subsequent Storage Project No.: DE-FE0001323 New Jersey Institute of Technology is developing an advanced pressure swing absorption-based (PSAB) device via laboratory-based experiments. The device will be used to accomplish a cyclic process to process low temperature post-shift-reactor synthesis gas resulting from the gasification process into purified hydrogen at high pressure for use by the combustion turbine of an integrated gasification combined cycle (IGCC) plant. The overall goal of the proposed work is to develop an advanced PSAB device and cyclic process for use in a coal-fired IGCC plant to produce purified hydrogen at high pressure and a highly purified CO2 stream suitable for use or sequestration.

214

Saturable absorption and 'slow light'  

E-Print Network (OSTI)

Quantitative evaluation of some recent 'slow light' experiments based on coherent population oscillations (CPO) shows that they can be more simply interpreted as saturable absorption phenomena. Therefore they do not provide an unambiguous demonstration of 'slow light'. Indeed a limiting condition on the spectral bandwidth is not generally satisfied, such that the requirements for burning a narrow spectral hole in the homogeneously broadened absorption line are not met. Some definitive tests of 'slow light' phenomena are suggested, derived from analysis of phase shift and pulse delay for a saturable absorber

Adrian C Selden

2005-12-16T23:59:59.000Z

215

Transient Xray absorption features in GRBs 1 Transient XRay Absorption in GRBs  

E-Print Network (OSTI)

due to photoelectric absorption or other atomic processes.) The transient nature of the absorptionTransient X­ray absorption features in GRBs 1 Transient X­Ray Absorption in GRBs and its Abstract The recent detection of a transient absorption feature in the prompt emission of GRB 990705 has

Boettcher, Markus

216

Interferometric tunability of the absorption  

E-Print Network (OSTI)

We propose an interferometric setup that permits to tune the quantity of radiation absorbed by an object illuminated by a fixed light source. The method can be used to selectively irradiate portions of an object based on their transmissivities or to accurately estimate the transmissivities from rough absorption measurements.

Vittorio Giovannetti; Seth Lloyd; Lorenzo Maccone

2006-02-14T23:59:59.000Z

217

Calcination and pyroprocessing of mineral fines  

Science Journals Connector (OSTI)

ABSTRACT During the past 40 years we have witnessed an interesting development in technologies for calcination and pyroprocessing of fine-grained material. This has led to the gas suspension principles now being widely used in the cement industry and in chemical processing systems for solids. The present paper deals with the dilute-phase systems and summarises the developments over the past 10 years illustrating the importance of raw material properties and product specifications in the selection and design of GSC systems. Methods for the characterisation of raw materials, such as crushed rock, flotation concentrates and hydrates, are illustrated with examples from industrial plants operating on dolomite, limestone and alumina hydrate. KEY WORDS GSC Gas Suspension Calcination Lime, Dolime, Alumina, Minerals Processing

E.A. Neubert

1988-01-01T23:59:59.000Z

218

Absorption Heat Pump Basics | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Absorption Heat Pump Basics Absorption Heat Pump Basics Absorption Heat Pump Basics August 19, 2013 - 11:11am Addthis Absorption heat pumps are essentially air-source heat pumps driven not by electricity, but by a heat source such as natural gas, propane, solar-heated water, or geothermal-heated water. Because natural gas is the most common heat source for absorption heat pumps, they are also referred to as gas-fired heat pumps. There are also absorption coolers available that work on the same principal, but are not reversible and cannot serve as a heat source. These are also called gas-fired coolers. How Absorption Heat Pumps Work Residential absorption heat pumps use an ammonia-water absorption cycle to provide heating and cooling. As in a standard heat pump, the refrigerant (in this case, ammonia) is condensed in one coil to release its heat; its

219

Absorption Heat Pumps | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Absorption Heat Pumps Absorption Heat Pumps Absorption Heat Pumps June 24, 2012 - 2:11pm Addthis Absorption heat pumps are essentially air-source heat pumps driven not by electricity, but by a heat source such as natural gas, propane, solar-heated water, or geothermal-heated water. Because natural gas is the most common heat source for absorption heat pumps, they are also referred to as gas-fired heat pumps. There are also absorption (or gas-fired) coolers available that work on the same principle. Unlike some absorption heat pumps, however, these are not reversible and cannot serve as a heat source. Residential absorption heat pumps use an ammonia-water absorption cycle to provide heating and cooling. As in a standard heat pump, the refrigerant (in this case, ammonia) is condensed in one coil to release its heat; its

220

Absorption Heat Pumps | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Absorption Heat Pumps Absorption Heat Pumps Absorption Heat Pumps June 24, 2012 - 2:11pm Addthis Absorption heat pumps are essentially air-source heat pumps driven not by electricity, but by a heat source such as natural gas, propane, solar-heated water, or geothermal-heated water. Because natural gas is the most common heat source for absorption heat pumps, they are also referred to as gas-fired heat pumps. There are also absorption (or gas-fired) coolers available that work on the same principle. Unlike some absorption heat pumps, however, these are not reversible and cannot serve as a heat source. Residential absorption heat pumps use an ammonia-water absorption cycle to provide heating and cooling. As in a standard heat pump, the refrigerant (in this case, ammonia) is condensed in one coil to release its heat; its

Note: This page contains sample records for the topic "absorption fine structure" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

Simulations of solar cell absorption enhancement using resonant modes of a nanosphere array  

E-Print Network (OSTI)

Simulations of solar cell absorption enhancement using resonant modes of a nanosphere array an approach for enhancing the absorption of thin-film amorphous silicon solar cells using periodic on the temporal coupled mode theory. Keywords: Resonant Dielectric Structures, Solar cells, Nanospheres

Grandidier, Jonathan

222

Self-consistent QM/MM methodologies for structural refinement of photosystem II and other macromolecules of biological interest  

SciTech Connect

The combination of quantum mechanics and molecular mechanics (QM/MM) is one of the most promising approaches to study the structure, function, and properties of proteins and nucleic acids. However, there some instances in which the limitations of either the MM (lack of a proper electronic description) or QM (limited to a few number of atoms) methods prevent a proper description of the system. To address this issue, we review here our approach to fine-tune the structure of biological systems using post-QM/MM refinements. These protocols are based on spectroscopy data, and/or partitioning of the system to extend the QM description to a larger region of a protein. We illustrate these methodologies through applications to several biomolecules, which were pre-optimized at the QM/MM level and then further refined using postQM/MM refinement methodologies: mod(QM/MM), which refines the atomic charges of the residues included in the MM region accounting for polarization effects; mod(QM/MM)-opt that partition the MM region in smaller parts and optimizes each part in an iterative. self-consistent way, and the Polarized-Extended X-Ray Absorption Fine Structure (P-EXAFS) fitting procedure, which fine-tune the atomic coordinates to reproduce experimental polarized EXAFS spectra. The first two techniques were applied to the guanine quadruplex. while the P-EXAFS refinement was applied to the oxygen evolving complex of photosystem II.

Batista, Enrique R [Los Alamos National Laboratory; Sproviero, Eduardo M [YALE UNIV; Newcomer, Michael [YALE UNIV; Gascon, Jose A [YALE UNIV; Batista, Victor S [YALE UNIV

2008-01-01T23:59:59.000Z

223

H I ABSORPTION TOWARD H II REGIONS AT SMALL GALACTIC LONGITUDES  

SciTech Connect

We make a comprehensive study of H I absorption toward H II regions located within |l| < 10 Degree-Sign . Structures in the extreme inner Galaxy are traced using the longitude-velocity space distribution of this absorption. We find significant H I absorption associated with the Near and Far 3 kpc Arms, the Connecting Arm, Bania's Clump 1, and the H I Tilted Disk. We also constrain the line-of-sight distances to H II regions, by using H I absorption spectra together with the H II region velocities measured by radio recombination lines.

Jones, C.; Dickey, J. M.; Dawson, J. R. [School of Mathematics and Physics, Private Bag 37, University of Tasmania, Hobart 7001 (Australia); McClure-Griffiths, N. M. [CSIRO Astronomy and Space Science, ATNF, P.O. Box 76, Epping, NSW 1710 (Australia); Anderson, L. D. [Department of Physics, West Virginia University, Morgantown, WV 26506 (United States); Bania, T. M. [Institute for Astrophysical Research, Department of Astronomy, Boston University, 725 Commonwealth Avenue, Boston, MA 02215 (United States)

2013-09-10T23:59:59.000Z

224

Symmetrical and anti-symmetrical coherent perfect absorption for acoustic waves  

SciTech Connect

We investigate tunable acoustic absorption enabled by the coherent control of input waves. It relies on coherent perfect absorption originally proposed in optics. By designing appropriate acoustic metamaterial structures with resonating effective bulk modulus or density, we show that complete absorption of incident waves impinging on the metamaterial can be achieved for either symmetrical or anti-symmetrical inputs in the forward and backward directions. By adjusting the relative phase between the two incident beams, absorption can be tuned effectively from unity to zero, making coherent control useful in applications like acoustic modulators, noise controllers, transducers, and switches.

Wei, Pengjiang; Cronne, Charles; Tak Chu, Sai [Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon (Hong Kong); Li, Jensen, E-mail: j.li@bham.ac.uk [School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT (United Kingdom)

2014-03-24T23:59:59.000Z

225

Electronic structure and fundamental absorption edges of KPb2Br5, K0.5Rb0.5Pb2Br5, and RbPb2Br5 single crystals  

Science Journals Connector (OSTI)

X-ray photoelectron core-level and valence-band spectra for pristine and Ar+-ion irradiated (001) surfaces of KPb2Br5, K0.5Rb0.5Pb2Br5, and RbPb2Br5 single crystals grown by the Bridgman method have been measured and fundamental absorption edges of the ternary bromides have been recorded in the polarized light at 300K and 80K. The present X-ray photoelectron spectroscopy (XPS) results reveal high chemical stability of (001) surfaces of KxRb1?xPb2Br5 (x=0, 0.5, and 1.0) single crystals. Substitution of potassium for rubidium in KxRb1?xPb2Br5 does not cause any changes of binding energy values and shapes of the XPS constituent element core-level spectra. Measurements of the fundamental absorption edges indicate that band gap energy, Eg, increases by about 0.14 and 0.19eV when temperature decreases from 300K to 80K in \\{KPb2Br5\\} and RbPb2Br5, respectively. Furthermore, there is no dependence of the Eg value for \\{KPb2Br5\\} upon the light polarization, whilst the band gap energy value for RbPb2Br5 is bigger by 0.030.05eV in the case of E?c compared to those in the cases of E?a and E?b.

A.Yu. Tarasova; L.I. Isaenko; V.G. Kesler; V.M. Pashkov; A.P. Yelisseyev; N.M. Denysyuk; O.Yu. Khyzhun

2012-01-01T23:59:59.000Z

226

Manganese valence and coordination structure in Mn,Mg-codoped {gamma}-AlON green phosphor  

SciTech Connect

The valence and coordination structure of manganese in a Mn,Mg-codoped {gamma}-AlON spinel-type oxynitride green phosphor were studied by synchrotron X-ray diffraction and absorption fine structure measurements. The absorption edge position of the XANES revealed the bivalency of Mn. Two cation sites are available in the spinel structure for cation doping: a tetrahedral site and an octahedral site. The pre-edge of the XANES and the distance to the nearest neighbor atoms obtained from the EXAFS measurement showed that Mn was situated at the tetrahedral site. Rietveld analysis showed that the vacancy occupied the octahedral site. The preferential occupation of the tetrahedral site by Mn and the roles of N and Mg are discussed in relation to the spinel crystal structure. - Graphical Abstract: Fourier transform of EXAFS of Mn K-edge for Mn,Mg-codoped green phosphor and Mn coordination structure. Highlights: Black-Right-Pointing-Pointer Mn, Mg-codoped {gamma}-AlON green phosphor for white LED. Black-Right-Pointing-Pointer The valence of Mn is divalent. Black-Right-Pointing-Pointer Mn occupies the tetrahedral site in the spinel structure.

Takeda, Takashi, E-mail: TAKEDA.Takashi@nims.go.jp [National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044 (Japan)] [National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044 (Japan); Xie, Rong-Jun; Hirosaki, Naoto [National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044 (Japan)] [National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044 (Japan); Matsushita, Yoshitaka [National Institute for Materials Science (NIMS), NIMS-SPring-8, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198 (Japan)] [National Institute for Materials Science (NIMS), NIMS-SPring-8, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198 (Japan); Honma, Tetuso [Japan Synchrotron Radiation Research Institute (JASRI), 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198 (Japan)] [Japan Synchrotron Radiation Research Institute (JASRI), 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198 (Japan)

2012-10-15T23:59:59.000Z

227

Investigations of the Absorption Properties of Near-Ground Aerosol by the Methods of Optical-Acoustic Spectrometry and Diff...  

NLE Websites -- All DOE Office Websites (Extended Search)

Investigations of the Absorption Properties of Investigations of the Absorption Properties of Near-Ground Aerosol by the Methods of Optical-Acoustic Spectrometry and Diffuse Extinction V. S. Kozlov, M. V. Panchenko, A. B. Tikhomirov, and B. A. Tikhomirov Institute of Atmospheric Optics Tomsk, Russia Introduction Aerosol absorption is an important factor in the formation of non-selective radiation extinction in the visible wavelength range, and plays a great role in solving many radiative and climatic problems. The principal absorbing substance in atmospheric aerosol is soot (crystal carbon), which strongly affects the atmospheric transparency, albedo of clouds, and snow cover. The non-selective absorption by finely dispersed soot aerosol is considered to be one of the most plausible reasons for the appearance of

228

Absorption properties of identical atoms  

E-Print Network (OSTI)

Emission rates and other optical properties of multiparticle systems in collective and entangled states differ from those in product ones. We show the existence of similar effects in the absorption probabilities for (anti)symmetrized states of two identical atoms. The effects strongly depend on the overlapping between the atoms and differ for bosons and fermions. We propose a viable experimental verification of these ideas.

Pedro Sancho

2013-07-31T23:59:59.000Z

229

Photodetector with enhanced light absorption  

DOE Patents (OSTI)

A photodetector including a light transmissive electrically conducting layer having a textured surface with a semiconductor body thereon. This layer traps incident light thereby enhancing the absorption of light by the semiconductor body. A photodetector comprising a textured light transmissive electrically conducting layer of SnO.sub.2 and a body of hydrogenated amorphous silicon has a conversion efficiency about fifty percent greater than that of comparative cells. The invention also includes a method of fabricating the photodetector of the invention.

Kane, James (Lawrenceville, NJ)

1985-01-01T23:59:59.000Z

230

Superposition model analysis from polarized electronic absorption  

Science Journals Connector (OSTI)

Polarized electronic absorption spectra of Co2+ in trigonally compressed octahedra in brucite-type Co(OH)2 have been measured at 290 and 90K by microscope-spectrometric techniques and analysed in terms of the superposition model (SM) of crystal fields. The resulting SM and interelectronic repulsion parameters are 4 = 5260, 2 = 4920, RacahB = 825, RacahC = 3550cm-1 at 290K and 4 = 5320, 2 = 3900, RacahB = 830, RacahC = 3500cm-1 at 90K (R0 = 2.1115; fixed exponential and spin-orbit parameters t4 = 5, t2 = 3, ? = 500cm-1). Together with a recent SM analysis of Li2Co3(SeO3)4, the k refined for Co(OH)2 further confine the magnitude of the hitherto unknown `correct' SM parameters of Co2+ for future application to structurally and/or chemically less well defined systems.

M Andrut; M Wildner

2001-01-01T23:59:59.000Z

231

Phosphate Absorption and Utilization by Barley  

Science Journals Connector (OSTI)

... SINCE the processes of absorption and translocation are closely ... of absorption and translocation are closely interrelated in the intact plant, the nutrient content of roots is both determined by the ...

1953-08-22T23:59:59.000Z

232

DNA Concentration By UV Spectrophotometry Measure Absorption  

E-Print Network (OSTI)

DNA Concentration By UV Spectrophotometry Measure Absorption: 1. Dilute DNA to 0.5 to 50 µg 2. Measure absorption at 260 nm (A260). Start by zeroing instrument with TE buffer or dH2O alone

Aris, John P.

233

GAX absorption cycle design process  

SciTech Connect

This paper presents an absorption system design process that relies on computer simulations that are validated by experimental findings. An ammonia-water absorption heat pump cycle at 3 refrigeration tons (RT) and chillers at 3.3 RT and 5 RT (10.5 kW, 11.6 kW, and 17.6 kW) were initially modeled and then built and tested. The experimental results were used to calibrate both the cycle simulation and the component simulations, yielding computer design routines that could accurately predict component and cycle performance. Each system was a generator-absorber heat exchange (GAX) cycle, and all were sized for residential and light commercial use, where very little absorption equipment is currently used. The specific findings of the 5 RT (17.6 kW) chiller are presented. Modeling incorporated a heat loss from the gas-fired generator and pressure drops in both the evaporator and absorber. Simulation results and experimental findings agreed closely and validated the modeling method and simulation software.

Priedeman, D.K.; Christensen, R.N.

1999-07-01T23:59:59.000Z

234

Purge needs in absorption chillers  

SciTech Connect

Absorption chillers are regaining a significant share of large tonnage chiller sales, such as they had 20 years ago. Gas-fired chillers are now available that have a base energy (ultimate fuel usage) consumption rate per ton comparable to that in electric units. Effective purging in an absorption chiller is an absolute necessity to achieve the low chilled water temperature needed for dehumidification and to fully benefit from the energy savings offered by double-effect cycles. Although the purge system is usually not shown on the typical cycle schematic, its proper functioning is a key requirement for satisfactory machine operation. This article discusses the effect of noncondensible (N/C) gases on the absorption cooling process and the basics of purge systems. In addition, the article discusses the rationale for the important design step of selecting the location of the N/C probe, and discusses purge systems applicable to the direct-fired, double-effect machines now entering the marketplace.

Murray, J.G. (Battelle, Columbus, OH (United States))

1993-10-01T23:59:59.000Z

235

Studies of selected transuranium and lanthanide triiodides under pressure using absorption spectrophotometry  

SciTech Connect

The anhydrous triiodides of plutonium, americium, and curium under pressure have been investigated using absorption spectrophotometry. These initial studies on plutonium and curium triiodides together with the published data for americium triiodide show that the rhombohedral (BiI/sub 3/-type structure) form of these compounds can be converted to the same orthorhombic (PuBr/sub 3/-type structure) form by applying pressure at room temperature. Absorption spectrophotometry can often differentiate between two crystallographic forms of materials and has been used in the present high pressure studies to monitor the effects of pressure on the triiodides. A complication in these studies of the triiodides is a significant shift of their absorption edges from the near uv to the visible spectral region with pressure. With curium triiodide this shift causes interference with the major f-f absorption peaks and precludes identification by absorption spectrophotometry of the high pressure phase of CmI/sub 3/. 21 refs., 2 figs.

Haire, R.G.; Young, J.P.; Peterson, J.R.; Benedict, U.

1986-01-01T23:59:59.000Z

236

Structurally assisted blackness in butterfly scales  

Science Journals Connector (OSTI)

...research-article Structurally assisted blackness in butterfly scales...photonic structure| Structurally assisted blackness in butterfly scales...ultrastructure Structurally assisted blackness in butterfly scales...Controlled absorption of incident solar radiation is the principal...

2004-01-01T23:59:59.000Z

237

Structure  

NLE Websites -- All DOE Office Websites (Extended Search)

Structure Structure functions 1 NOTE: THE FIGURES IN THIS SECTION ARE INTENDED TO SHOW THE REPRESENTATIVE DATA. THEY ARE NOT MEANT TO BE COMPLETE COMPILATIONS OF ALL THE WORLD'S RELIABLE DATA. Q 2 (GeV 2 ) F 2 (x,Q 2 ) * 2 i x H1 ZEUS BCDMS E665 NMC SLAC 10 -3 10 -2 10 -1 1 10 10 2 10 3 10 4 10 5 10 6 10 7 10 8 10 9 10 -1 1 10 10 2 10 3 10 4 10 5 10 6 Figure 16.6: The proton structure function F p 2 measured in electromagnetic scattering of positrons on protons (collider experiments ZEUS and H1), in the kinematic domain of the HERA data, for x > 0.00006 (cf. Fig. 16.9 for data at smaller x and Q 2 ), and for electrons (SLAC) and muons (BCDMS, E665, NMC) on a fixed target. Statistical and systematic errors added in quadrature are shown. The data are plotted as a function of Q 2 in bins of fixed x. Some points have been slightly offset in Q 2 for clarity. The ZEUS binning in x is used in this plot; all other data are rebinned to the x values of

238

ALGEBRAIC ASPECTS OF EMISSION TOMOGRAPHY WITH ABSORPTION  

E-Print Network (OSTI)

ALGEBRAIC ASPECTS OF EMISSION TOMOGRAPHY WITH ABSORPTION L. Hajdu and R. Tijdeman Abstract of emission tomography with absorption, con- sider a ray (such as light or X-ray) transmitting through #1; e #22;x ; where #22; #21; 0 denotes the absorption coe?cient of the material, and x is the length

Tijdeman, Robert

239

Absorption Coefficients and Impedance Daniel A. Russell  

E-Print Network (OSTI)

1 Absorption Coefficients and Impedance Daniel A. Russell Science and Mathematics Department will measure the absorption coefficients and acoustic impedance of samples of acoustic absorbing materials material is responsible for almost 50% of sound absorption inside an automobile). The reverberation time

Russell, Daniel A.

240

Discriminant Absorption Feature Learning for Material Classification  

E-Print Network (OSTI)

1 Discriminant Absorption Feature Learning for Material Classification Zhouyu Fu, Antonio Robles in spectral imaging by combining the use of invariant spectral absorption features and statistical machine learning techniques. Our method hinges in the relevance of spectral absorption features for material

Robles-Kelly, Antonio

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241

Enhanced Absorption Induced by a Metallic Nanoshell  

E-Print Network (OSTI)

Enhanced Absorption Induced by a Metallic Nanoshell Roi Baer* Department of Physical Chemistry ABSTRACT Nanoshells have been previously shown to have tunable absorption frequencies that are dependent on the ratio of their inner and outer radii. Inspired by this, we ask: can a nanoshell increase the absorption

Baer, Roi

242

LIMITING ABSORPTION PRINCIPLE FOR SINGULARLY PERTURBED OPERATORS  

E-Print Network (OSTI)

LIMITING ABSORPTION PRINCIPLE FOR SINGULARLY PERTURBED OPERATORS WALTER RENGER Abstract. Given an operator H 1 for which a limiting absorption principle holds, we study operators H 2 which are produced that (except for possibly a discrete set of eigenvalues) a limiting absorption principle holds for H 2 . We

243

Absorption cross section in Lifshitz black hole  

E-Print Network (OSTI)

We derive the absorption cross section of a minimally coupled scalar in the Lifshitz black hole obtained from the new massive gravity. The absorption cross section reduces to the horizon area in the low energy and massless limit of s-wave mode propagation, indicating that the Lifshitz black hole also satisfies the universality of low energy absorption cross section for black holes.

Taeyoon Moon; Yun Soo Myung

2012-05-10T23:59:59.000Z

244

Original article Improvement of zinc intestinal absorption  

E-Print Network (OSTI)

Original article Improvement of zinc intestinal absorption and reduction of zinc/iron interaction of caseins, improves its absorption and could prevent inhibition by other nutrients such as iron (Fe). The absorption of Zn (100 Ilmol/L) bound to the 1-25 CN ((3-CN(1-25)) of (3-casein, or as ZnS04 was studied using

Boyer, Edmond

245

Opacity of iron, nickel, and copper plasmas in the x-ray wavelength range: Theoretical interpretation of 2p-3d absorption spectra  

SciTech Connect

This paper deals with theoretical studies on the 2p-3d absorption in iron, nickel, and copper plasmas related to LULI2000 (Laboratoire pour l'Utilisation des Lasers Intenses, 2000J facility) measurements in which target temperatures were of the order of 20 eV and plasma densities were in the range 0.004-0.01 g/cm{sup 3}. The radiatively heated targets were close to local thermodynamic equilibrium (LTE). The structure of 2p-3d transitions has been studied with the help of the statistical superconfiguration opacity code sco and with the fine-structure atomic physics codes hullac and fac. A new mixed version of the sco code allowing one to treat part of the configurations by detailed calculation based on the Cowan's code rcg has been also used in these comparisons. Special attention was paid to comparisons between theory and experiment concerning the term features which cannot be reproduced by sco. The differences in the spin-orbit splitting and the statistical (thermal) broadening of the 2p-3d transitions have been investigated as a function of the atomic number Z. It appears that at the conditions of the experiment the role of the term and configuration broadening was different in the three analyzed elements, this broadening being sensitive to the atomic number. Some effects of the temperature gradients and possible non-LTE effects have been studied with the help of the radiative-collisional code scric. The sensitivity of the 2p-3d structures with respect to temperature and density in medium-Z plasmas may be helpful for diagnostics of LTE plasmas especially in future experiments on the {Delta}n=0 absorption in medium-Z plasmas for astrophysical applications.

Blenski, T.; Loisel, G.; Poirier, M.; Thais, F.; Arnault, P.; Caillaud, T.; Fariaut, J.; Gilleron, F.; Pain, J.-C.; Porcherot, Q.; Reverdin, C.; Silvert, V.; Villette, B.; Bastiani-Ceccotti, S.; Turck-Chieze, S.; Foelsner, W.; Gaufridy de Dortan, F. de [CEA, IRAMIS, Service 'Photons, Atomes et Molecules', Centre d'Etudes de Saclay, F-91191 Gif-sur-Yvette Cedex (France); CEA, DAM, DIF, F-91297 Arpajon (France); LULI, UMR No. 7605 CNRS - Ecole Polytechnique, F-91128 Palaiseau Cedex (France); CEA, IRFU, Service d'Astrophysique, Centre d'Etudes de Saclay, F-91191 Gif-sur-Yvette Cedex (France); Max-Planck-Institut fuer Quantenoptik, D-85748 Garching (Germany); Institute of Nuclear Fusion, Universidad Politecnica de Madrid, Spain and Laboratoire d'Optique Appliquee, ENSTA-Paritech-Polytechnique, Chemin de la Huniere, F-91671 Palaiseau (France)

2011-09-15T23:59:59.000Z

246

Energy absorption behaviors of nanoporous materials functionalized (NMF) liquids  

E-Print Network (OSTI)

investigating high-performance energy absorption materials,investigating high-performance energy absorption materials,high energy absorption efficiency of nanoporous materials

Kim, Tae Wan

2011-01-01T23:59:59.000Z

247

Salicylate Toxicity from Ingestion and Continued Dermal Absorption  

E-Print Network (OSTI)

of salicylate dermal absorption and toxicity. REFERENCESand Continued Dermal Absorption Rachel L. Chin, MD*, Kent R.bases in the percutaneous absorption of salicylates II. J

Chin, Rachel L; Olson, Kent R; Dempsey, Delia

2007-01-01T23:59:59.000Z

248

SENSITIVE OPTOACOUSTIC DETECTION OF CARBON MONOXIDE BY RESONANCE ABSORPTION  

E-Print Network (OSTI)

Monoxide by Resonance Absorption Robert Gerlach and Nabil M.MONOXIDE BY RESONANCE ABSORPTION Robert Gerlach and Nabil M.the context of atmospheric absorption. The carbon monoxide

Gerlach, R.

2011-01-01T23:59:59.000Z

249

Absorption of Foliar-Applied Nitrogen by Cotton  

E-Print Network (OSTI)

wax, and nitrogen-15 absorption. Crop Science 37:807-811.water- deficit stress, and the absorption of foliar-appliedgrowth favorable for N absorption and translocation. Four

Oosterhuis, Derrick M

2009-01-01T23:59:59.000Z

250

Energy absorption behaviors of nanoporous materials functionalized (NMF) liquids  

E-Print Network (OSTI)

of a nanoporous energy absorption system by using chemicalSurani, and Y. Qiao, "Energy absorption of nanoporous silicaSAN DIEGO Energy Absorption Behaviors of Nanoporous

Kim, Tae Wan

2011-01-01T23:59:59.000Z

251

Inorganic composition of fine particles in mixed mineral dustpollution plumes observed from airborne measurements during ACE-Asia  

E-Print Network (OSTI)

of the atmosphere (2419, 2427); 0345 Atmospheric Composition and Structure: Pollution--urban and regional (0305Inorganic composition of fine particles in mixed mineral dust­pollution plumes observed from of Earth and Atmospheric Science, Georgia Institute of Technology, Atlanta, Georgia, USA G. R. Carmichael

Weber, Rodney

252

High Energy Astrophysics: Emission and Absorption 1/114 Emission and Absorption  

E-Print Network (OSTI)

High Energy Astrophysics: Emission and Absorption 1/114 Emission and Absorption 1 Motivation and the jet. #12;High Energy Astrophysics: Emission and Absorption 2/114 HST optical image of 3C273 Note: Emission and Absorption 3/114 Set of 3 images of the jet of 3C273. Left: HST Middle: Chandra X-ray Right

Bicknell, Geoff

253

X-ray Absorption Spectroscopy Identifies Calcium-Uranyl-Carbonate Complexes at Environmental Concentrations  

SciTech Connect

Current research on bioremediation of uranium-contaminated groundwater focuses on supplying indigenous metal-reducing bacteria with the appropriate metabolic requirements to induce microbiological reduction of soluble uranium(VI) to poorly soluble uranium(IV). Recent studies of uranium(VI) bioreduction in the presence of environmentally relevant levels of calcium revealed limited and slowed uranium(VI) reduction and the formation of a Ca-UO2-CO3 complex. However, the stoichiometry of the complex is poorly defined and may be complicated by the presence of a Na-UO2-CO3 complex. Such a complex might exist even at high calcium concentrations, as some UO2-CO3 complexes will still be present. The number of calcium and/or sodium atoms coordinated to a uranyl carbonate complex will determine the net charge of the complex. Such a change in aqueous speciation of uranium(VI) in calcareous groundwater may affect the fate and transport properties of uranium. In this paper, we present the results from X-ray absorption fine structure (XAFS) measurements of a series of solutions containing 50 lM uranium(VI) and 30 mM sodium bicarbonate, with various calcium concentrations of 0-5 mM. Use of the data series reduces the uncertainty in the number of calcium atoms bound to the UO2-CO3 complex to approximately 0.6 and enables spectroscopic identification of the Na-UO2-CO3 complex. At nearly neutral pH values, the numbers of sodium and calcium atoms bound to the uranyl triscarbonate species are found to depend on the calcium concentration, as predicted by speciation calculations.

Kelly, Shelly D [Argonne National Laboratory (ANL); Kemner, Kenneth M [Argonne National Laboratory (ANL); Brooks, Scott C [ORNL

2007-01-01T23:59:59.000Z

254

Advanced regenerative absorption refrigeration cycles  

DOE Patents (OSTI)

Multi-effect regenerative absorption cycles which provide a high coefficient of performance (COP) at relatively high input temperatures. An absorber-coupled double-effect regenerative cycle (ADR cycle) (10) is provided having a single-effect absorption cycle (SEA cycle) (11) as a topping subcycle and a single-effect regenerative absorption cycle (1R cycle) (12) as a bottoming subcycle. The SEA cycle (11) includes a boiler (13), a condenser (21), an expansion device (28), an evaporator (31), and an absorber (40), all operatively connected together. The 1R cycle (12) includes a multistage boiler (48), a multi-stage resorber (51), a multisection regenerator (49) and also uses the condenser (21), expansion device (28) and evaporator (31) of the SEA topping subcycle (11), all operatively connected together. External heat is applied to the SEA boiler (13) for operation up to about 500 degrees F., with most of the high pressure vapor going to the condenser (21) and evaporator (31) being generated by the regenerator (49). The substantially adiabatic and isothermal functioning of the SER subcycle (12) provides a high COP. For higher input temperatures of up to 700 degrees F., another SEA cycle (111) is used as a topping subcycle, with the absorber (140) of the topping subcycle being heat coupled to the boiler (13) of an ADR cycle (10). The 1R cycle (12) itself is an improvement in that all resorber stages (50b-f) have a portion of their output pumped to boiling conduits (71a-f) through the regenerator (49), which conduits are connected to and at the same pressure as the highest pressure stage (48a) of the 1R multistage boiler (48).

Dao, Kim (14 Nace Ave., Piedmont, CA 94611)

1990-01-01T23:59:59.000Z

255

Impact of energy-related pollutants on chromosome structure. Progress report, January 1-December 31, 1980. IQUID COLUMN CHROMATOGRAPHY; ABSORPTION SPECTRA; COMPUTER CODES; DICHROISM; EQUIPMENT INTERFACES; MICROPROCESSORS; SPECTROPHOTOMETERS; ; CARBON 13; COMPLEXES; NUCLEAR MAGNETIC RESONANCE  

SciTech Connect

Methods for rapidly analyzing methylated and ethylated nucleosides and bases by high pressure liquid chromatography were investigated. Deoxyribonucleotides were alkylated with alkyl iodides and dialkyl sulfates. Several unreported products of the reactions of methyl and ethyl iodide in dimethylsulfoxide were found and are being characterized. The Cary 219 UV-Vis spectrophotometer was interfaced to a microcomputer and several utility programs were written. Preliminary absorption and circular dichroism studies of the binding of ethidium to DNA and nucleosome cores showed binding to cores to be quite different from binding to DNA. Free radical and additional reactions of bisulfite with DNA in chromatin were examined. Free radical attack was minimal. Some conversion of cytosine to uracil was noted, but protein crosslinking to DNA was not detected. The first valid natural abundance /sup 13/C nmr spectra of double-stranded DNA and double-stranded DNA complexed with ethidium were obtained. These spectra suggested that DNA undergoes considerable internal motion. The data show that 13-C nmr studies of the conformational and motional properties of native DNA and of complexes of native DNA with small molecules are practical and promising. Studies of subnucleosomes derived from nucleosomes were completed. Based on these studies, a model of the linear arrangement of histone C-terminal and N-terminal chain regions along nucleosome DNA was proposed. The use of staphylococcal protease to probe histone conformations in nucleosomes was explored. Preliminary data indicate that H3 is much more susceptible to protease than other core histones, and is cleaved in its hydrophobic domain. A procedure for fractionating chromatin was alos developed. (ERB)

Not Available

1980-01-01T23:59:59.000Z

256

THE SOCIAL UNDERPINNINGS OF ABSORPTIVE CAPACITY: EXTERNAL KNOWLEDGE, SOCIAL NETWORKS, AND INDIVIDUAL  

E-Print Network (OSTI)

-FOUNDATIONS OF ABSORPTIVE CAPACITY 3.1 The Social Structure of Innovation 3.2 External knowledge 3.2.1 Scientific vs. Industrial External Knowledge 3.3 Internal Social Structure 3.3.1 Is brokerage always good for innovation? 3.4 A new framework for social structure and innovativeness 3.5 Local vs. Global Informational Advantages

Sadeh, Norman M.

257

Radiative muon absorption in calcium  

Science Journals Connector (OSTI)

The photon spectrum from radiative absorption of negative muons in Ca40 has been measured with a high-resolution pair spectrometer. The data are analyzed in order to determine the induced pseudoscalar coupling constant gp in nuclear matter. When compared to models which use a realistic nuclear response function and avoid the closure approximation, a value of gp/gA=4.01.5 is obtained, which indicates a quenching of this coupling compared to the nucleonic value by a factor 0.570.25.

A. Frischknecht; W. Stehling; G. Strassner; P. Trul; J. C. Alder; C. Joseph; J. F. Loude; J. P. Perroud; D. Ruegger; T. M. Tran; W. Dahme; H. Panke; R. Kopp

1985-11-01T23:59:59.000Z

258

Calcium silicate insulation structure  

DOE Patents (OSTI)

An insulative structure including a powder-filled evacuated casing utilizes a quantity of finely divided synthetic calcium silicate having a relatively high surface area. The resultant structure-provides superior thermal insulating characteristics over a broad temperature range and is particularly well-suited as a panel for a refrigerator or freezer or the insulative barrier for a cooler or a insulated bottle.

Kollie, Thomas G. (Oak Ridge, TN); Lauf, Robert J. (Oak Ridge, TN)

1995-01-01T23:59:59.000Z

259

Effects of self-irradiation on local crystal structure and 5flocalization in PuCoGa5  

SciTech Connect

The 18.5 K superconductor PuCoGa{sub 5} has many unusual properties, including those due to damage induced by self-irradiation. The superconducting transition temperature decreases sharply with time, suggesting a radiation-induced Frenkel defect concentration much larger than predicted by current radiation damage theories. Extended x-ray absorption fine-structure measurements demonstrate that while the local crystal structure in fresh material is well ordered, aged material is disordered much more strongly than expected from simple defects, consistent with strong disorder throughout the damage cascade region. These data highlight the potential impact of local lattice distortions relative to defects on the properties of irradiated materials and underscore the need for more atomic-resolution structural comparisons between radiation damage experiments and theory.

Booth, C.H.; Daniel, M.; Wilson, R.E.; Bauer, E.D.; Mitchell,J.N.; Moreno, N.O.; Morales, L.A.; Sarrao, J.L.; Allen, P.G.

2006-10-20T23:59:59.000Z

260

Temperature and potential-dependent structural changes in a Pt cathode electrocatalyst viewed by in situ XAFS  

Science Journals Connector (OSTI)

The paper presents an X-ray absorption fine structure (XAFS) investigation of Pt supported on Vulcan XC-72 operating as a cathode catalyst in a polymer electrolyte membrane fuel cell (PEM FC). XAFS spectroscopy was performed in situ using a cell developed by the authors and optimized for absorption measurements. Low-noise spectra were obtained using the transmission mode over the Pt L3 XAFS range, enabling multiple-scattering XAFS data-analysis for the Pt nanocrystalline system under operating conditions. Accurate measurements of the local structure were performed at various potentials and working temperatures. Changes in the near-edge structures reflecting variations in the Pt electronic structure were observed for various potential values in the cathode activation region. The Pt average local geometric structure was found to be practically potential-independent. The increase in structural disorder caused by the higher working FC temperature was not found to affect the catalysts performance in the kinetically controlled region.

Agnieszka Witkowska; Emiliano Principi; Andrea Di Cicco; Sonia Dsoke; Roberto Marassi; Luca Olivi; Massimo Centazzo; Valerio Rossi Albertini

2008-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "absorption fine structure" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

FINE VARIATION AND FRACTAL MEASURES G. A. Edgar  

E-Print Network (OSTI)

FINE VARIATION AND FRACTAL MEASURES G. A October, 1994 Abstract. Thomson noted that (in the line) the Hausdorff measures can be * *consid of the "centered ball" basis yields an alternate description o* *f the cover- ing measures of Saint Raymond

Edgar, Gerald

262

Modified approaches for high pressure filtration of fine clean coal  

SciTech Connect

Removal of moisture from fine (minus 28 mesh) clean coal to 20% or lower level is difficult using the conventional vacuum dewatering technique. High pressure filtration technique provides an avenue for obtaining low moisture in fine clean coal. This paper describes a couple of novel approaches for dewatering of fine clean coal using pressure filtration which provides much lower moisture in fine clean coal than that obtained using conventional pressure filter. The approaches involve (a) split stream dewatering and (b) addition of paper pulp to the coal slurry. For Pittsburgh No. 8 coal slurry, split stream dewatering at 400 mesh provided filter cake containing 12.9% moisture compared to 24.9% obtained on the feed material. The addition of paper pulp to the slurry provided filter cake containing about 17% moisture.

Yang, J.; Groppo, J.G.; Parekh, B.K. [Center for Applied Energy Research, Lexington, KY (United States)

1995-12-31T23:59:59.000Z

263

Nontoxic chemical process for in situ permeability enhancement and accelerated decontamination of fine-grain subsurface sediments  

DOE Patents (OSTI)

The remediation of heterogeneous subsurfaces is extremely time consuming and expensive with current and developing technologies. Although such technologies can adequately remove contaminants in the high hydraulic conductivity, coarse-grained sediments, they cannot access the contaminated low hydraulic conductivity fine-grained sediments. The slow bleed of contaminants from the fine-grained sediments is the primary reason why subsurface remediation is so time-consuming and expensive. This invention addresses the problem of remediating contaminated fine-grained sediments. It is intended that, in the future, a heterogeneous site be treated by a hybrid process that first remediates the high hydraulic conductivity, coarse-grained sediments, to be followed by the process, described in this invention, to treat the contaminated low hydraulic conductivity fine-grained sediments. The invention uses cationic flocculents and organic solvents to collapse the swelling negative double layer surrounding water saturated clay particles, causing a flocculated, cracked clay structure. The modification of the clay fabric in fine-grained sediments dramatically increases the hydraulic conductivity of previously very tight clays many orders of magnitude.

Kansa, Edward J. (Livermore, CA); Wijesinghe, Ananda M. (Tracy, CA); Viani, Brian E. (Oakland, CA)

1997-01-01T23:59:59.000Z

264

Hazards analysis for the E.O. Lawrence Berkeley National Laboratory x-ray absorption experiments to be performed at Stanford Synchrotron Radiation Laboratory  

SciTech Connect

The objective of this experiment is to determine the oxidation state(s) of neptunium (Np) in mouse skeleton and in soft tissue by X-ray Absorption Near Edge Structure (XANES). If Np is present in sufficient concentration, X-ray Absorption Fine Structure (XAFS) data will be obtained in order to further identify the Np species present. These data will be crucial in understanding the metabolic pathway of Np in mammals which will help in the design of reagents which can eliminate Np from mammals in the event of accidental exposure. It is proposed to run these experiments at the Standard Synchrotron Radiation Laboratory (SSRL). This laboratory is a DOE national user facility located at the Stanford Linear Accelerator Center (SLAC). The {sup 237}Np nucleus decays by the emission of an alpha particle and this particle emission is the principal hazard in handling Np samples. This hazard is mitigated by physical containment of the sample which stops the alpha particles within the containment. The total amount of Np material that will be shipped to and be at SSRL at any one time will be less than 1 gram. This limit on the amount of Np will ensure that SLAC remains a low hazard, non-nuclear facility. The Np samples will be solids or Np ions in aqueous solution. The Np samples will be shipped to SSRL/SLAC OHP. SLAC OHP will inventory the samples and swipe the containers holding the triply contained samples, and then bring them to the SSRL Actinide trailer located outside building 131. The QA counting records from the samples, as measured at LBNL, will be provided to SSRL and SLAC OHP prior to the arrival of the samples at SLAC OHP. In addition, strict monitoring of the storage and experimental areas will be performed in accordance with SLAC/OHP radiation protection procedures to ensure against the release of contamination.

Edelstein, N.M.; Shuh, D.K.; Bucher, J.B. [Lawrence Berkeley National Lab., CA (United States). Chemical Sciences Div.

1995-04-01T23:59:59.000Z

265

NETL: Ambient Monitoring - Southern Fine Particulate Monitoring Project  

NLE Websites -- All DOE Office Websites (Extended Search)

Southern Fine Particulate Monitoring Project (SRI) Southern Fine Particulate Monitoring Project (SRI) Southern Research Institute (SRI), Birmingham, AL, is operating a research station in North Birmingham for monitoring fine particulate matter (PM2.5) that exists in that part of the Deep South. The station will be a core PM2.5 mass monitoring and chemical speciation station in the nationwide EPA PM2.5 network. As such, it will be a complement and supplement to DOE-NETL's other ongoing projects for monitoring fine particulate matter in the upper Ohio River valley. Locating additional monitoring equipment in the Deep South will fill an important gap in the national particulate monitoring effort. The region's topography, weather patterns, and variety of emission sources may affect the chemical make-up and airborne transport of fine particles in ways that are different than in other parts of the country. The project's results will support DOE's comprehensive program to evaluate ambient fine particulate matter through better understanding of the chemical and physical properties of these materials.

266

Absorption Cooling Basics | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Cooling Basics Cooling Basics Absorption Cooling Basics August 16, 2013 - 2:26pm Addthis Absorption coolers use heat rather than electricity as their energy source. Because natural gas is the most common heat source for absorption cooling, it is also referred to as gas-fired cooling. Other potential heat sources include propane, solar-heated water, or geothermal-heated water. Although mainly used in industrial or commercial settings, absorption coolers are commercially available for large residential homes. How Absorption Cooling Works An absorption cooling cycle relies on three basic principles: When a liquid is heated it boils (vaporizes) and when a gas is cooled it condenses Lowering the pressure above a liquid reduces its boiling point Heat flows from warmer to cooler surfaces.

267

Quantum-enhanced absorption refrigerators  

E-Print Network (OSTI)

Thermodynamics is a branch of science blessed by an unparalleled combination of generality of scope and formal simplicity. Based on few natural assumptions together with the four laws, it sets the boundaries between possible and impossible in macroscopic aggregates of matter. This triggered groundbreaking achievements in physics, chemistry and engineering over the last two centuries. Close analogues of those fundamental laws are now being established at the level of individual quantum systems, thus placing limits on the operation of quantum-mechanical devices. Here we study quantum absorption refrigerators, which are driven by heat rather than external work. We establish thermodynamic performance bounds for these machines and investigate their quantum origin. We also show how those bounds may be pushed beyond what is classically achievable, by suitably tailoring the environmental fluctuations via quantum reservoir engineering techniques. Such superefficient quantum-enhanced cooling realises a promising step towards the technological exploitation of autonomous quantum refrigerators.

Luis A. Correa; Jos P. Palao; Daniel Alonso; Gerardo Adesso

2013-08-19T23:59:59.000Z

268

Backscatter absorption gas imaging system  

DOE Patents (OSTI)

A video imaging system for detecting hazardous gas leaks. Visual displays of invisible gas clouds are produced by radiation augmentation of the field of view of an imaging device by radiation corresponding to an absorption line of the gas to be detected. The field of view of an imager is irradiated by a laser. The imager receives both backscattered laser light and background radiation. When a detectable gas is present, the backscattered laser light is highly attenuated, producing a region of contrast or shadow on the image. A flying spot imaging system is utilized to synchronously irradiate and scan the area to lower laser power requirements. The imager signal is processed to produce a video display.

McRae, Jr., Thomas G. (Livermore, CA)

1985-01-01T23:59:59.000Z

269

Olefin recovery via chemical absorption  

SciTech Connect

The recovery of fight olefins in petrochemical plants has generally been accomplished through cryogenic distillation, a process which is very capital and energy intensive. In an effort to simplify the recovery process and reduce its cost, BP Chemicals has developed a chemical absorption technology based on an aqueous silver nitrate solution. Stone & Webster is now marketing, licensing, and engineering the technology. The process is commercially ready for recovering olefins from olefin derivative plant vent gases, such as vents from polyethylene, polypropylene, ethylene oxide, and synthetic ethanol units. The process can also be used to debottleneck C{sub 2} or C{sub 3} splinters, or to improve olefin product purity. This paper presents the olefin recovery imp technology, discusses its applications, and presents economics for the recovery of ethylene and propylene.

Barchas, R. [Stone & Webster Engineering Corporation, Houston, TX (United States)

1998-06-01T23:59:59.000Z

270

Combining Feedback Absorption Spectroscopy, Amplified Resonance...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

On-Board Measurement of Ammonia and Nitrous Oxide Using Feedback Absorption Laser Spectroscopy Combined with Amplified Resonance and Low Pressure Sampling Cummins...

271

Direct and quantitative absorptive spectroscopy of nanowires  

E-Print Network (OSTI)

Photonic nanostructures exhibit unique optical properties that are attractive in many different applications. However, measuring the optical properties of individual nanostructures, in particular the absorptive properties, ...

Tong, Jonathan Kien-Kwok

2012-01-01T23:59:59.000Z

272

An Analysis of Cloud Absorption During  

NLE Websites -- All DOE Office Websites (Extended Search)

Analysis of Cloud Absorption During ARESE II (Spring 2000) D. M. Powell, R. T. Marchand, and T. P. Ackerman Pacific Northwest National Laboratory Richland, Washington Introduction...

273

MEASUREMENT OF VISIBLE LIGHT ABSORPTION BY ...  

Science Journals Connector (OSTI)

Energy Commission under contract ... the measurement of light absorption by these particles is .... poorer resolution by the Hubbard unit is largely the result of a

274

Microwave and optical saturable absorption in graphene  

Science Journals Connector (OSTI)

We report on the first experiments on saturable absorption in graphene at microwave frequency band. Almost independent of the incident frequency, microwave absorbance of graphene...

Zheng, Zhiwei; Zhao, Chujun; Lu, Shunbin; Chen, Yu; Li, Ying; Zhang, Han; Wen, Shuangchun

2012-01-01T23:59:59.000Z

275

Yttrium Dopants in Titania: not Structurally Incorporated but Bound at  

NLE Websites -- All DOE Office Websites (Extended Search)

Yttrium Dopants in Titania: not Structurally Yttrium Dopants in Titania: not Structurally Incorporated but Bound at Surfaces Structurally incorporated impurities have been shown to have systematic effects on the rate of the thermally driven transformation in titania nanoparticles [1-4]. The anatase-to-rutile transformation is slowed when anatase nanoparticles are doped with a cation of valence > +4, but favored when the valence < +4. Based on these observations, Y3+ dopants should promote the anatase-to-rutile transformation. However, prior studies showed that the transformation is inhibited by Y3+ impurities [1,2], without explaining this observation. In a study led by the scientists of University of California Berkeley and Lawrence Berkeley National Laboratory, extended x-ray absorption fine structure (EXAFS) experiments on yttrium-doped titania nanoparticles were conducted for determining the local structural environment of Y3+ impurities. The experiments were developed in collaboration with SSRL beamline scientists at BLs 10-2 and 11-2.

276

Effect of morphology and solvent on two-photon absorption of nano zinc oxide  

SciTech Connect

Highlights: ? ZnO nanospheres and triangular structures synthesis by novel precipitation technique. ? The effect of precursor concentration on the size and shape of nano ZnO. ? Open aperture Z-scan measurements of the ZnO nanoparticle dispersions. ? Nanospheres exhibit higher two photon absorption coefficient than triangular nanostructures. ? Nanospheres dispersed in water exhibit higher two photon absorption coefficient than its dispersion in 2-propanol. - Abstract: In this paper, we report the effect of morphology and solvent on the two-photon absorption of nano zinc oxide. Zinc oxide nanoparticles in two different morphologies like nanospheres and triangular nanostructures are synthesized by novel precipitation technique and their two-photon absorption coefficient is measured using open aperture Z-scan technique. Experimental results show that the zinc oxide nanospheres exhibit higher two-photon absorption coefficient than the zinc oxide triangular nanostructures. The zinc oxide nanospheres dispersed in water exhibit higher two-photon absorption coefficient than that of its dispersion in 2-propanol. The zinc oxide nanospheres dispersed in water shows a decrease in two-photon absorption coefficient with an increase in on-axis irradiance. The result confirms the dependence of shape and solvent on the two-photon absorption of nano zinc oxide.

Kavitha, M.K. [Department of Chemistry, Indian Institute of Space Science and Technology, Valiamala, Thiruvananthapuram 695547, Kerala (India); Haripadmam, P.C.; Gopinath, Pramod; Krishnan, Bindu [Department of Physics, Indian Institute of Space Science and Technology, Valiamala, Thiruvananthapuram 695547, Kerala (India); John, Honey, E-mail: honey@iist.ac.in [Department of Chemistry, Indian Institute of Space Science and Technology, Valiamala, Thiruvananthapuram 695547, Kerala (India)

2013-05-15T23:59:59.000Z

277

Multiplexed Selective Detection and Identification of TCE and Xylene in Water by On-Chip Absorption Spectroscopy  

E-Print Network (OSTI)

and identify chemical and biological analytes based on photonic crystal platform has been investigated more can do multiplexed detection of two different chemicals on one chip by using infrared absorption. Consequently, the absorption of these two chemicals can be enhanced by the slow light effect. The MMI structure

Chen, Ray

278

Transient simulation of absorption machines  

SciTech Connect

This paper presents a model for a water-cooled Lithium-Bromide/water absorption chiller and predicts its transient response both during the start-up phase and during the shutoff period. The simulation model incorporates such influencing factors as the thermodynamic properties of the working fluid, the absorbent, the heat-transfer configuration of different components of the chiller and related physical data. The time constants of different components are controlled by a set of key parameters that have been identified in this study. The results show a variable but at times significant amount of time delay before the chiller capacity gets close to its steady-state value. The model is intended to provide an insight into the mechanism of build-up to steady-state performance. By recognizing the significant factors contributing to transient degradation, steps can be taken to reduce such degradation. The evaluation of the residual capacity in the shut-off period will yield more realistic estimates of chiller COP for a chiller satisfying dynamic space cooling load.

Anand, D.K.; Allen, R.W.; Kumar, B.

1982-08-01T23:59:59.000Z

279

Transient simulation of absorption machines  

SciTech Connect

This paper presents a model for a water-cooled Lithium-Bromide/water absorption chiller and predicts its transient response both during the start-up phase and during the shutoff period. The simulation model incorporates such influencing factors as the thermodynamic properties of the working fluid, the absorbent, the heat-transfer configuration of different components of the chiller and related physical data. The time constants of different components are controlled by a set of key parameters that have been identified in this study. The results show a variable but at times significant amount of time delay before the chiller capacity gets close to its steadystate value. The model is intended to provide an insight into the mechanism of build-up to steady-state performance. By recognizing the significant factors contributing to transient degradation, steps can be taken to reduce such degradation. The evaluation of the residual capacity in the shut-off period will yield more realistic estimates of chiller COP for a chiller satisfying dynamic space cooling load.

Anand, D.K.; Allen, R.W.; Kumar, B.

1982-08-01T23:59:59.000Z

280

Microsoft Word - Finely_NorthValley_CX.docx  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Cecilia Brown Cecilia Brown Project Manager - KEWM-4 Proposed Action: Finely Creek and North Valley Creek property funding Fish and Wildlife Project No. and Contract No.: 2002-003-00, BPA-58888 Categorical Exclusion Applied (from Subpart D, 10 C.F.R. Part 1021): B1.25 Real property transfers for cultural resources protection, habitat preservation, and wildlife management Location: Finely Creek: Township 16 North, Range 20 West, Section 24; Missoula County, MT. North Valley Creek: Township 17 North, Range 20 West, Section 19; Lake County, MT. Proposed by: Bonneville Power Administration (BPA) Description of the Proposed Action: BPA proposes to fund the Confederated Salish and Kootenai Tribes (CSKT) for the purchase of 9 acres of property, referred to as the Finely Creek Property,

Note: This page contains sample records for the topic "absorption fine structure" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

Fine root dynamics in a developing Populus deltoides plantation.  

SciTech Connect

A closely spaced (1 x 1 m) cottonwood (Populus deltoides Bartr.) platation was established to evaluate the effects of nutrient availability on fine root dynamics. Slow-release fertilizer (17:6:12 N,P,K plus micronutrients) was applied to 225-m2 plots at 0, 50, 100, 200 kg N ha-1, and plots were monitored for two growing seasons. Fine root production, mortality, live root standing crop and life span were analyzed based on monthly minirhizotron observations. Fine root biomass was measured in soil cores. Fine root dynamics were controlled more by temporal, depth and root diameter factors than by fertilization. Cumulative fine root production and mortality showed strong seasonal patterns; production was greatest in the middle of the growing season and mortality was greatest after the grwoing season. Small diameter roots at shallow soil depths cycled more rapidly than large or deeper roots. The strongest trearment effects were found in the most rapidly cycling roots. The standing crop of live roots increased with fertilizer treatment according to both minirhizotron and soil coring methods. However, production and mortality had unique treatment response patterns. Although cumulative mortality decreased in response to increased fertilization, cumulative production was intermediate at 0 kg N ha-1, lowest with 50 kg N ha-1, and highest with 200 kg N ha-1. Above ground growth responded positively to fertilization up to an application rate of 50 kg N ha-1 but no further increase in application rate. Median fine root life span varied from 307 to over 700 day and increased with depth, diameter and nutrient availability.

Kern, Christel C.; Friend, Alexander L.; Johnson, Jane M.; Coleman, Mark D.

2004-07-01T23:59:59.000Z

282

Absorption spectrum of Ca atoms attached to $^4$He nanodroplets  

E-Print Network (OSTI)

Within density functional theory, we have obtained the structure of $^4$He droplets doped with neutral calcium atoms. These results have been used, in conjunction with newly determined {\\it ab-initio} $^1\\Sigma$ and $^1\\Pi$ Ca-He pair potentials, to address the $4s4p$ $^1$P$_1 \\leftarrow 4s^2$ $^1$S$_0$ transition of the attached Ca atom, finding a fairly good agreement with absorption experimental data. We have studied the drop structure as a function of the position of the Ca atom with respect of the center of mass of the helium moiety. The interplay between the density oscillations arising from the helium intrinsic structure and the density oscillations produced by the impurity in its neighborhood plays a role in the determination of the equilibrium state, and hence in the solvation properties of alkaline earth atoms. In a case of study, the thermal motion of the impurity within the drop surface region has been analyzed in a semi-quantitative way. We have found that, although the atomic shift shows a sizeable dependence on the impurity location, the thermal effect is statistically small, contributing by about a 10% to the line broadening. The structure of vortices attached to the calcium atom has been also addressed, and its effect on the calcium absorption spectrum discussed. At variance with previous theoretical predictions, we conclude that spectroscopic experiments on Ca atoms attached to $^4$He drops will be likely unable to detect the presence of quantized vortices in helium nanodrops.

Alberto Hernando; Manuel Barranco; Marek Kro?nicki; Ricardo Mayol; Mart Pi

2007-11-12T23:59:59.000Z

283

Coherent Perfect Absorption of Single Photons  

E-Print Network (OSTI)

We examine the question of coherent perfect absorption (CPA) of single photons, and more generally, of the quantum fields. We show the CPA of path entangled single photons in a Fabry-Perot interferometer containing an absorptive medium. The frequency of perfect absorption can be controlled by changing the interferometer parameters like the reflectivity and the complex dielectric constant of the material. We exhibit similar results for path entangled photons in micro-ring resonators. For entangled fields like the ones produced by a down converter the CPA aspect is evident in phase sensitive detection schemes such as in measurements of the squeezing spectrum.

Huang, Sumei

2014-01-01T23:59:59.000Z

284

Multiphonon Absorption in NaF  

Science Journals Connector (OSTI)

The infrared absorption in NaF at the two CO2 laser wavelengths 10.6 and 9.3 ?m was measured between 4 and 400 K. The results complement the previously measured absorption for higher temperatures, and allow for a detailed comparison with theoretical predictions. The experimental temperature dependence at 10.6 ?m can be excellently fitted by a curve expected for three-phonon processes in the whole temperature range; the absorption at 9.3 ?m fits a mixture of three- and four-phonon processes.

Dieter W. Pohl and Peter F. Meier

1974-01-14T23:59:59.000Z

285

Total absorption by degenerate critical coupling  

SciTech Connect

We consider a mirror-symmetric resonator with two ports. We show that, when excited from a single port, complete absorption can be achieved through critical coupling to degenerate resonances with opposite symmetry. Moreover, any time two resonances with opposite symmetry are degenerate in frequency and absorption is always significantly enhanced. In contrast, when two resonances with the same symmetry are nearly degenerate, there is no absorption enhancement. We numerically demonstrate these effects using a graphene monolayer on top of a photonic crystal slab, illuminated from a single side in the near-infrared.

Piper, Jessica R., E-mail: jrylan@stanford.edu; Liu, Victor; Fan, Shanhui, E-mail: shanhui@stanford.edu [Ginzton Laboratory, Department of Electrical Engineering, Stanford University, Stanford, California 94305 (United States)

2014-06-23T23:59:59.000Z

286

Absorption and Scattering When we have both variations in both absorption and scattering, the solution to the  

E-Print Network (OSTI)

Chapter 6 Absorption and Scattering When we have both variations in both absorption and scattering of absorption and scatttering. 6.1 Simulation Results For the following simulationsthe forward data were of the simulation. #12;Absorption and Scattering 107 We have reconstructed images of scattering and absorption

287

Hyperfine Studies of Lithium Vapor using Saturated Absorption Spectroscopy  

E-Print Network (OSTI)

the frequency of a laser with respect to an atomic spectral feature.[20] As such, saturated absorptionHyperfine Studies of Lithium Vapor using Saturated Absorption Spectroscopy? . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 3.3 Broadening Mechanisms . . . . . . . . . . . . . . . . . . . . . 15 3.4 Saturated Absorption

Cronin, Alex D.

288

X-ray Absorption Spectroscopy of Biologically Relevant Systems  

E-Print Network (OSTI)

308, Messer, B. M. X-ray Absorption Spectroscopy of AqueousSarcosine via X-ray Absorption Spectroscopy 5.1 Introductionwith Carboxylate by X-Ray Absorption Spectroscopy of Liquid

Uejio, Janel Sunayo

2010-01-01T23:59:59.000Z

289

THE RELATION OF BACKSCATTERING TO SELF-ABSORPTION  

E-Print Network (OSTI)

of backscattering upon salf-absorption correction data, somemg/cm I Figure 1. Self-absorption Correction Curves forof backsc3ttering upon self-absorption correction curves are

Yankwich, Peter E.

2010-01-01T23:59:59.000Z

290

Solar absorption by Mie resonances in cloud droplets  

E-Print Network (OSTI)

on the enhancement factor for absorption of light by carbonKlett JD. Black carbon and absorption of solar radiation bySize parameter; Particle absorption; Water clouds; Aerosols

Zender, Charles S; Talamantes, Jorge

2006-01-01T23:59:59.000Z

291

09-10 Catalog Date ________________________ FINE ARTS: STUDIO  

E-Print Network (OSTI)

include 12 hours of social sciences [at least 2 different areas; 6 hours above freshman level]) 3000 2650 2750 ("C" or better necessary to move to next level of studio work in a given area.) 9 Fine Arts Option (one area) __________ __________ __________ __________* *Senior project in area of concentration

Kulp, Mark

292

BWR ATWS mitigation by Fine Motion Control Rod  

SciTech Connect

Two main methods of ATWS mitigation in a SBWR are: fine Motion control Rods (FMCRD) and Boron injection via the Standby Liquid control System (SLCS). This study has demonstrated that the use of FMCRD along with feedwater runback mitigated the conditions due to reactivity insertion and possible ATWS in a BWR which is similar to SBWR.

Rohatgi, U.S.; Cheng, H.S.; Khan, H.; Mallen, A.; Diamond, D.

1994-03-01T23:59:59.000Z

293

WASHLOAD AND FINE SEDIMENT LOAD By Hyoseop S. Woo,1  

E-Print Network (OSTI)

WASHLOAD AND FINE SEDIMENT LOAD By Hyoseop S. Woo,1 Pierre Y. Julien,2 M. ASCE, and Everett V describes it very distinctly. He stated that if the sediment is added to the upstream end of a concrete channel and the channel is swept clean, and the sediment has not left any trace in the channel, its rate

Julien, Pierre Y.

294

Fine tuning of graphene-metal adhesion by surface alloying  

E-Print Network (OSTI)

Fine tuning of graphene-metal adhesion by surface alloying D. Alfe`1,2 , M. Pozzo1 , E. Miniussi3 route for governing the interaction between graphene and metal through the selective choice characterization of the properties of graphene on a model PtRu surface alloy on Ru(0001), with a concentration

Alfè, Dario

295

Evaluation of fine-granular GPS tracking on smartphones  

Science Journals Connector (OSTI)

Smartphones with their GPS capabilities allow tracking in numerous scenarios at low costs. Whereas most scenarios need only coarse tracking, real-time tracking of competitors in sport events require fine-granular localization with high refresh frequencies. ... Keywords: GPS performance, evaluation, mobile localization and tracking, smartphone application for GIS

Basil Hess; Armin Zamani Farahani; Fabian Tschirschnitz; Felix von Reischach

2012-11-01T23:59:59.000Z

296

Fine and coarse components in surface sediments from Bikini Lagoon  

SciTech Connect

In 1979, 21 years after the moratorium on nuclear testing in the Marshall Islands, surface sediment samples (to depths of 2 and 4 cm) were collected from 87 locations in the lagoon of Bikini Atoll, one of the two sites in the Marshall Islands used by the United States to test nuclear devices from 1946 through 1958. The main purpose for the collections was to map the distribution of long-lived man-made radionuclides associated with the bottom material. In addition the samples were processed to estimate the fraction of fine and coarse components to show, by comparison, what modifications occurred in the composition since the sediments were first described in samples collected before testing in 1946. Nuclear testing produced more finely divided material that is now found in the surface sediment layer over large areas of the lagoon and especially in regions of the lagoon and reef adjacent to test sites. The 5 cratering events alone at Bikini Atoll redistributed sufficient material to account for the higher inventory of fine material found over the surface 4 cm of the sediment of the lagoon. Although the fraction of fine material in the bottom sediments was altered by the nuclear events, the combined processes of formation, transport and deposition were not sufficiently dynamic to greatly change the general geographical features of the major sedimentary components over most of the lagoon floor.

Noshkin, V. E., LLNL

1997-01-01T23:59:59.000Z

297

Favorable electronic structure for organic solar cells induced by strong interaction at interface  

SciTech Connect

To clarify the role of buffer layer in organic solar cells (OSCs), the electronic properties of bathocuproine (BCP)/Mg interface were systematically investigated by using ultraviolet photoemissions spectroscopy, high-resolution X-ray photoemission spectroscopy, angle-resolved X-ray photoemission spectroscopy and near-edge X-ray absorption fine structure (NEXAFS) spectroscopy. The results show there are gap states at the interface, which are caused by the interaction between BCP and Mg. The formation of Mg-N bond was found at the interface. The NEXAFS measurements show that BCP molecules for 1-2 monolayers are lying-down on the substrate, whereas orient randomly for thick BCP layer. It was supposed that the gap states and the highly-ordered orientation of thin BCP layer are the reasons for improving the performance of OSC with BCP buffer layer and low work function metal cathode.

Wang, Shenghao, E-mail: wsh8511@gmail.com; Hao, Xia; Fu, Wei; Akimoto, Katsuhiro [Institute of Applied Physics, University of Tsukuba, Tsukuba, Ibaraki 305-8573 (Japan); Sakurai, Takeaki [Institute of Applied Physics, University of Tsukuba, Tsukuba, Ibaraki 305-8573 (Japan); PRESTO, Japan Science and Technology Agency (JST), Kawaguchi, Saitama 332-0012 (Japan); Masuda, Shigeru [Department of Basic Science, Graduate School of Arts and Sciences, The University of Tokyo, Komaba, Meguro, Tokyo 153-8902 (Japan)

2013-11-14T23:59:59.000Z

298

Are synchroton radiation studies (including EXAFS) breakthroughs in structurals studies of metalloproteins?  

Science Journals Connector (OSTI)

Electrons travelling around storage rings in vacuum at close to the speed of light are being exploited to an increasing extent by bioinorganic chemists. These electrons emit intense radiation ranging from the infrared through X-ray regions. The radiation is continuous in energy, pulsed, polarized, and of intensity not otherwise obtainable for comparable time periods. The availability of the synchrotron radiation has elicited an increasing variety of absorption and scattering techniques. The absorption edge, the X-ray Absorption Near Edge Structure (XANES) and the Extended X-ray Absorption Fine Structure (EXAFS) have each been exploited as have scattering techniques. This discussion brings together from four countries (and four synchrotron sources) some of the major proponents and users of synchrotron radiation. The round table will entail short (2025 minutes) formal presentations by each of the 5 participants in which they will seek not only to expose their own work but also to put it in the context of the full impact of synchrotron radiation studies. Short question periods will follow each talk and a final period will be left for discussion among the panelists, further questions from the audience and summing up. To start the session, Cramer will introduce the synchrotron sources and radiation characteristics, discuss absorption applications to nitrogenase, hemoglobin and cytochrome oxidase and describe some of the future novel ways of exploiting the characteristics of the radiation. Stuhrmann will continue this line by describing the hierarchy of information one gets from absorption and scattering experiments and he will review applications of scattering to such systems as ferritin, hemoglobin and t-RNA. Teo will emphasize the detailed information obtainable from EXAFS and will discuss its application to Fe systems in nitrogenase and 3Fe?3S cluster systems. Bianconi will focus on the information attainable from XANES as compared to EXAFS and will discuss applications of XANES to hemoglobin and calmodulin structure. Finally, Garner will discuss some of the EXAFS analysis protocols and their limits and will analyze recent data from superoxide dismutase and metallothionein Between them our distinguished panelists should cover many of the established and emerging synchrotron techniques as well as their application to systems containing Fe, Cu, Zn, Mo, Ca, Mg, Cs, I and Tb. The panelists and convener are committed to pedagogical presentations, lacking in undefined jargon and abbreviations. We will endeavor to convey an appreciation for the powers and limits of the various techniques. If we do our job well, the answer to the question posed in the title of the Round Table should become obvious to the audience.

E.I. Stiefel

1983-01-01T23:59:59.000Z

299

Visible spectrometer utilizing organic thin film absorption  

E-Print Network (OSTI)

In this thesis, I modeled and developed a spectrometer for the visible wavelength spectrum, based on absorption characteristics of organic thin films. The device uses fundamental principles of linear algebra to reconstruct ...

Tiefenbruck, Laura C. (Laura Christine)

2004-01-01T23:59:59.000Z

300

Electronic Structure of CeFeAsO1-xFx (x=0, 0.11/x=0.12) compounds  

SciTech Connect

We report an extensive study on the intrinsic bulk electronic structure of the high-temperature superconductor CeFeAsO{sub 0.89}F{sub 0.11} and its parent compound CeFeAsO by soft and hard x-ray photoemission, x-ray absorption and soft-x-ray emission spectroscopies. The complementary surface/bulk probing depth, and the elemental and chemical sensitivity of these techniques allows resolving the intrinsic electronic structure of each element and correlating it with the local structure, which has been probed by extended-x-ray absorption fine structure spectroscopy. The measurements indicate a predominant 4f{sup 1} (i.e. Ce{sup 3+}) initial state configuration for Cerium and an effective valence-band-to-4f charge-transfer screening of the core hole. The spectra also reveal the presence of a small Ce f{sup 0} initial state configuration, which we assign to the occurrence of an intermediate valence state. The data reveal a reasonably good agreement with the partial density of states as obtained in standard density functional calculations over a large energy range. Implications for the electronic structure of these materials are discussed.

Bondino, F.; Magnano, E.; Booth, C. H.; Offi, F.; Panaccione, G.; Malvestuto, M.; Paolicelli, G.; Simonelli, L.; Parmigiani, F.; McGuire, M. A.; Sefat, A. S.; Sales, B. C.; Jin, R.; Vilmercati, P.; Mandrus, D.; Singh, D. J.; Mannella, N.

2011-01-25T23:59:59.000Z

Note: This page contains sample records for the topic "absorption fine structure" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

E-Print Network 3.0 - absorption model Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

stochastic absorption for the modeling of absorption... absorption eliminates the reflection that ... Source: Pradhan, Prabhakar - Department of Electrical and Computer...

302

On the mechanism of electromagnetic microwave absorption in superfluid helium  

SciTech Connect

In experiments on electromagnetic (EM) wave absorption in the microwave range in superfluid (SF) helium [1-3], a narrow EM field absorption line with a width on the order of (20-200) kHz was observed against the background of a wide absorption band with a width of 30-40 GHz at frequencies f{sub 0} Almost-Equal-To 110-180 GHz corresponding to the roton gap energy {Delta}{sub r}(T) in the temperature range 1.4-2.2 K. Using the so-called flexoelectric mechanism of polarization of helium atoms ({sup 4}He) in the presence of density gradients in SF helium (HeII), we show that nonresonance microwave absorption in the frequency range 170-200 GHz can be due to the existence of time-varying local density gradients produced by roton excitations in the bulk HeII. The absorption bandwidth is determined by the roton-roton scattering time in an equilibrium Boltzmann gas of rotons, which is t{sub r-r} Almost-Equal-To 3.4 Multiplication-Sign 10{sup -11} s at T = 1.4 K and decreases upon heating. We propose that the anomalously narrow microwave resonance absorption line in HeII at the roton frequency f{sub 0}(T) = {Delta}r(T)/2{pi}h appears due to the following two factors: (i) the discrete structure of the spectrum of the surface EM resonator modes in the form of a periodic sequence of narrow peaks and (ii) the presence of a stationary dipole layer in HeII near the resonator surface, which forms due to polarization of {sup 4}He atoms under the action of the density gradient associated with the vanishing of the density of the SF component at the solid wall. For this reason, the relaxation of nonequilibrium rotons generated in such a surface dipole layer is strongly suppressed, and the shape and width of the microwave resonance absorption line are determined by the roton density of states, which has a sharp peak at the edge of the roton gap in the case of weak dissipation. The effective dipole moments of rotons in the dipole layer can be directed either along or across the normal to the resonator surface, which explains the experimentally observed symmetric doublet splitting of the resonance absorption line in an external dc electric field perpendicular to the resonator surface. We show that negative absorption (induced emission) of EM field quanta observed after triggering a Kapitza 'heat gun' occurs when the occupation numbers for roton states due to 'pumping' of rotons exceed the occupation numbers of EM field photons in the resonator.

Pashitskii, E. A., E-mail: pashitsk@iop.kiev.ua; Pentegov, V. I. [National Academy of Sciences of Ukraine, Institute of Physics (Ukraine)

2012-08-15T23:59:59.000Z

303

Dynamics of the structure of the plasma current sheath in a plasma focus discharge  

Science Journals Connector (OSTI)

The study is aimed at investigating the fine structure of the plasma current sheath (PCS) in the PF-3 plasma focus facility. The PCS dynamics in a deuterium...

V. I. Krauz; K. N. Mitrofanov; V. V. Myalton; V. P. Vinogradov

2011-09-01T23:59:59.000Z

304

Two-Photon Absorption and Coherence  

Science Journals Connector (OSTI)

We study the probabilities for two-photon absorption processes induced by both coherent and thermal light when acting on an atomic system. Calculations are performed with quantum electrodynamics, and we find results similar to those obtained with semiclassical methods; that is, the two-photon absorption probability depends on the statistical properties of the light used. This probability assumes its maximum value for coherent light.

S. Carusotto; G. Fornaca; E. Polacco

1967-05-25T23:59:59.000Z

305

Coherence and Two-Photon Absorption  

Science Journals Connector (OSTI)

A kinetic theory of the two-photon absorption from a single mode of the radiation field is presented. It is found that, in general, the rate of two-photon absorption depends on certain correlation functions, and hence on the coherence properties, of the field. The results are applied to the case of a pure coherent state and the case of a chaotic field.

P. Lambropoulos; C. Kikuchi; R. K. Osborn

1966-04-29T23:59:59.000Z

306

Absorption cross section of RN black hole  

E-Print Network (OSTI)

The behavior of a charged scalar field in the RN black hole space time is studied using WKB approximation. In the present work it is assumed that matter waves can get reflected from the event horizon. Using this effect, the Hawking temperature and the absorption cross section for RN black hole placed in a charged scalar field are calculated. The absorption cross section $\\sigma _{abs}$ is found to be inversely proportional to square of the Hawking temperature of the black hole.

Sini R.; V. C. Kuriakose

2007-08-23T23:59:59.000Z

307

Absorption Heat Pump Water Heater - 2013 Peer Review | Department...  

Energy Savers (EERE)

Absorption Heat Pump Water Heater - 2013 Peer Review Absorption Heat Pump Water Heater - 2013 Peer Review Emerging Technologies Project for the 2013 Building Technologies Office's...

308

Residential Absorption Heat Pump Water Heater | Department of...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Heat Pump Water Heater Residential Absorption Heat Pump Water Heater Photo credit: Oak Ridge National Lab Photo credit: Oak Ridge National Lab Diagram of absorption heat...

309

Reduction in biomass burning aerosol light absorption upon humidificat...  

NLE Websites -- All DOE Office Websites (Extended Search)

in biomass burning aerosol light absorption upon humidification: Roles of inorganically-induced hygroscopicity, Reduction in biomass burning aerosol light absorption upon...

310

E-Print Network 3.0 - absorption spectrometry configurations...  

NLE Websites -- All DOE Office Websites (Extended Search)

Trace Elements in Biological Tissues by Summary: Block Digestion and Spike-Height Flame Atomic Absorption Spectrometry ,.. U. TINGGI AND W. MAHER School... absorption...

311

Self-corrected Sensors Based On Atomic Absorption Spectroscopy...  

NLE Websites -- All DOE Office Websites (Extended Search)

corrected Sensors Based On Atomic Absorption Spectroscopy For Atom Flux Measurements In Molecular Beam Epitaxy. Self-corrected Sensors Based On Atomic Absorption Spectroscopy For...

312

E-Print Network 3.0 - absorption spectrometry analyticalmethod...  

NLE Websites -- All DOE Office Websites (Extended Search)

Trace Elements in Biological Tissues by Summary: Block Digestion and Spike-Height Flame Atomic Absorption Spectrometry ,.. U. TINGGI AND W. MAHER School... absorption...

313

Charge Resonance Effects on Electronic Absorption Line Shapes: Application to the Heterodimer Absorption of Bacterial Photosynthetic Reaction Centers  

E-Print Network (OSTI)

to the formalism of Fano's treatment for atomic absorption line shapes associated with autoionization (Fano, UCharge Resonance Effects on Electronic Absorption Line Shapes: Application to the Heterodimer Absorption of Bacterial Photosynthetic Reaction Centers Huilin Zhou and Steven G. Boxer* Department

Boxer, Steven G.

314

DAFS study of site-specific local structure of Mn in manganese ferrite films.  

SciTech Connect

Manganese ferrite (MnFe{sub 2}O{sub 4}) is a well-known magnetic material widely used in electronics for many years. It is well established that its magnetic behavior is strongly influenced by local structural properties of Mn ions, which are distributed between crystallographically inequivalent tetrahedral and octahedral sites in the unit cell. In order to understand and be able to tune properties of these structures, it is necessary to have detailed site-specific structural information on the system. Here we report on the application of diffraction-anomalous fine structure (DAFS) spectroscopy to resolve site-specific Mn local structures in manganese ferrite films. The DAFS measurements were done at undulator beamline 4-ID-D of the Advanced Photon Source at Argonne National Laboratory. The DAFS spectra (Fig. 1) were measured at several Bragg reflections in the vicinity of the Mn absorption K-edge, having probed separately contributions from tetrahedrally and octahedrally coordinated Mn sites. The DAFS data analysis done with an iterative Kramers-Kroenig algorithm made it possible to solve separately the local structure around different inequivalent Mn sites in the unit cell. The reliability of the data treatment was checked carefully, and it was showed that the site-specific structural parameters obtained with DAFS allow us to describe fluorescence EXAFS spectrum measured independently. Fig. 2 shows individual site contributions to the imaginary part of the resonant scattering amplitude obtained from the treatment of the data of Fig. 1. The analysis of the refined site-specific absorption spectra was done using EXAFS methods based on theoretical standards. We provided direct evidence for the tetrahedral Mn-O bond distance being increased relative to the corresponding Fe-O distance in bulk manganese ferrites. The first coordination shell number was found to be reduced significantly for Mn atoms at these sites. This finding is consistent with the well-known tendency of Mn to be tetrahedrally coordinated in these compounds.

Kravtsov, E.; Haskel, D.; Cady, A.; Yang, A.; Vittoria, C.; Zuo, X.; Harris, V. G.; X-Ray Science Division; Inst. of Metal Physics; Northeastern Univ.; Nankai Univ.

2006-01-01T23:59:59.000Z

315

Stability of Bulk Metallic Glass Structure. Final Report  

SciTech Connect

The fundamental origins of the stability of the (Pd-Ni){sub 80}P{sub 20} bulk metallic glasses (BMGs), a prototype for a whole class of BMG formers, were explored. While much of the properties of their BMGs have been characterized, their glass-stability have not been explained in terms of the atomic and electronic structure. The local structure around all three constituent atoms was obtained, in a complementary way, using extended X-ray absorption fine structure (EXAFS), to probe the nearest neighbor environment of the metals, and extended energy loss fine structure (EXELFS), to investigate the environment around P. The occupied electronic structure was investigated using X-ray photoelectron spectroscopy (XPS). The (Pd-Ni){sub 80}P{sub 20} BMGs receive their stability from cumulative, and interrelated, effects of both atomic and electronic origin. The stability of the (Pd-Ni){sub 80}P{sub 20} BMGs can be explained in terms of the stability of Pd{sub 60}Ni{sub 20}P{sub 20} and Pd{sub 30}Ni{sub 50}P{sub 20}, glasses at the end of BMG formation. The atomic structure in these alloys is very similar to those of the binary phosphide crystals near x=0 and x=80, which are trigonal prisms of Pd or Ni atoms surrounding P atoms. Such structures are known to exist in dense, randomly-packed systems. The structure of the best glass former in this series, Pd{sub 40}Ni{sub 40}P{sub 20} is further described by a weighted average of those of Pd{sub 30}Ni{sub 50}P{sub 20} and Pd{sub 60}Ni{sub 20}P{sub 20}. Bonding states present only in the ternary alloys were found and point to a further stabilization of the system through a negative heat of mixing between Pd and Ni atoms. The Nagel and Tauc criterion, correlating a decrease in the density of states at the Fermi level with an increase in the glass stability, was consistent with greater stability of the Pd{sub x}Ni{sub 80-x}P{sub 20} glasses with respect to the binary alloys of P. A valence electron concentration of 1.8 e/a, which ensures the superpositioning of the first peak in the structure factor with twice the Fermi momentum, was used to calculate the interatomic potential of these alloys. The importance of Pd to the stability of the alloys is evidenced by the fact that replacing Ni and Pd places the nearest neighbor distances at more attractive positions in this potential.

Jain, H.; Williams, D. B.

2003-06-01T23:59:59.000Z

316

On the variations of optical property and electronic structure in heavily Al-doped ZnO films during double-step growth process  

SciTech Connect

We have investigated the variations of optical property and electronic structure in heavily Al-doped ZnO (AZO) films during the growth process, which were formed by first creating Zn vacancies in O{sub 2}-rich atmosphere and second filling the vacancies with Zn atoms in Zn-vapor atmosphere. After the first step, the high-resistance AZO films have the same optical bandgap with nominally undoped ZnO, indicating that negligible variations in the fundamental bandgap happened to the AZO films although Al atom was incorporated into the ZnO lattice. After the second step, once free electrons were brought into the lattice by Zn-filling, the optical transition energy blueshifts due to the band-filling effect. X-ray absorption fine structure measurements suggest that Zn-filling process decreased the unoccupied states of the conduction band, but not raised the conduction band minimum.

Hu, Q. C.; Ding, K., E-mail: kding@fjirsm.ac.cn; Zhang, J. Y.; Yan, F. P.; Pan, D. M.; Huang, F., E-mail: fhuang@fjirsm.ac.cn [Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002 (China); Chiou, J. W., E-mail: jwchiou@nuk.edu.tw [Department of Applied Physics, National University of Kaohsiung, Kaohsiung 811, Taiwan (China)

2014-01-13T23:59:59.000Z

317

Quantifying the Magnitude of Anomalous Solar Absorption  

SciTech Connect

The data set from ARESE II, sponsored by the Atmospheric Radiation Measurement Program, provides a unique opportunity to understand solar absorption in the atmosphere because of the combination of three sets of broadband solar radiometers mounted on the Twin Otter aircraft and the ground based instruments at the ARM Southern Great Plains facility. In this study, we analyze the measurements taken on two clear sky days and three cloudy days and model the solar radiative transfer in each case with two different models. On the two clear days, the calculated and measured column absorptions agree to better than 10 Wm-2, which is about 10% of the total column absorption. Because both the model fluxes and the individual radiometer measurements are accurate to no better than 10 Wm-2, we conclude that the models and measurements are essentially in agreement. For the three cloudy days, the model calculations agree very well with each other and on two of the three days agree with the measurements to 20 Wm-2 or less out of a total column absorption of more than 200 Wm-2, which is again agreement at better than 10%. On the third day, the model and measurements agree to either 8% or 14% depending on which value of surface albedo is used. Differences exceeding 10% represent a significant absorption difference between model and observations. In addition to the uncertainty in absorption due to surface albedo, we show that including aerosol with an optical depth similar to that found on clear days can reduce the difference between model and measurement by 5% or more. Thus, we conclude that the ARESE II results are incompatible with previous studies reporting extreme anomalous absorption and can be modeled with our current understanding of radiative transfer.

Ackerman, Thomas P.; Flynn, Donna M.; Marchand, Roger T.

2003-05-16T23:59:59.000Z

318

Size, shape, and crystallinity of luminescent structures in oxidized Si nanoclusters and H-passivated porous Si  

SciTech Connect

Near-edge and extended x-ray absorption fine structure measurements from a wide variety of H-passivated porous Si samples and oxidized Si nanocrystals, combined with electron microscopy, ir-absorption, {alpha}-recoil, and luminescence emission data, provide a consistent structural picture of the species responsible for the luminescence observed in these systems. For luminescent porous Si samples peaking in the visible region, i. e., {le}700nm, their mass-weighted-average structures are determined here to be particles - not wires, whose short-range character is crystalline - not amorphous, and whose dimensions - typically <15 {angstrom} - are significantly smaller than previously reported or proposed. These results depend only on sample luminescence behavior, not on sample preparation details, and thus have general implications in describing the mechanism responsible for visible luminescence in porous silicon. New results are also presented which demonstrate that the observed luminescence is unrelated to either the photo-oxidized Si species in porous Si or the interfacial suboxide species in the Si nanocrystals.

Schuppler, S.; Marcus, M.A.; Xie, Y.H.; Harris, T.D.; Brown, W.L.; Chabal, Y.J.; Szajowski, P.J.; Friedman, S.L.; Adler, D.L. [AT& T Bell Labs., Murray Hill, NJ (United States); Ross, F.M. [Lawrence Berkeley Lab., CA (United States)] [and others

1994-11-01T23:59:59.000Z

319

Fine, New York: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

Fine, New York: Energy Resources Fine, New York: Energy Resources Jump to: navigation, search Equivalent URI DBpedia Coordinates 44.2478396°, -75.1377015° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":44.2478396,"lon":-75.1377015,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

320

Solar absorption aqua-ammonia absorption system simulation base on climate of Malaysia  

Science Journals Connector (OSTI)

Solar energy is one of the most well known green sources of energy. This research presents a feasibility study of evacuated solar thermal collector by aqua-ammonia ejector absorption systems as a small scale air conditioning unit. The modeling has been ... Keywords: ejector, evacuated tubes, solar assisted absorption system

Poorya Ooshaksaraei; Sohif Mat; M. Yahya; Ahmad Mahir Razali; Azami Zaharim; K. Sopian

2010-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "absorption fine structure" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

X-ray bandwidth: Determination by on-edge absorption and effect on various absorption experiments  

E-Print Network (OSTI)

X-ray bandwidth: Determination by on-edge absorption and effect on various absorption experiments of an x-ray source is increasingly important in fundamental experi- ments and critical applications. The bandwidth of an x-ray beam, selected from a synchrotron radiation spectrum for example, ultimately defines

Chantler, Christopher T.

322

Ethylene adsorbed on Ni(110): An experimental and theoretical determination of the two-dimensional band structure  

Science Journals Connector (OSTI)

We have investigated the saturated ethylene layer on Ni(110) by low-energy electron diffraction (LEED), angle-resolved ultraviolet photoemission spectroscopy (ARUPS), and near-edge x-ray-absorption fine structure (NEXAFS). This layer exhibits a c(24) LEED pattern that corresponds to a structure containing two adsorbates per primitive unit cell. The ethylene molecules are adsorbed with the molecular plane parallel to the surface and the C-C axis preferentially aligned along the [110] direction of the substrate, as is independently determined from the ARUPS and NEXAFS experiments. The two-dimensional (2D) adsorbate band structure is determined from the ARUPS spectra at various photon energies. Except for the ? orbital, all ethylene-derived bands show significant dispersion (up to 2 eV), but no splitting as would be expected for a structure with two molecules per unit cell. The experimentally determined band structure is reproduced in all details by extended-Hckel-theory calculations for an unsupported ethylene layer. The structural model derived from LEED, ARUPS, and NEXAFS is confirmed both by force field and by the 2D band-structure calculations. This indicates that the adsorbate-adsorbate interactions are essentially decoupled from the adsorbate-substrate interaction, that is responsible for the chemisorption bond.

M. Weinelt; W. Huber; P. Zebisch; H.-P. Steinrck; B. Reichert; U. Birkenheuer; N. Rsch

1992-07-15T23:59:59.000Z

323

Estimate of fine sediment deposit dynamics on a gravel bar using photography analysis  

E-Print Network (OSTI)

Estimate of fine sediment deposit dynamics on a gravel bar using photography analysis B. CAMENEN1 , M. JODEAU2 , and M. JABALLAH3 Abstract Three different methods to analyse fine sediment deposits the ground. These methods were used to estimate the surface of fine sediment deposits before and after

Paris-Sud XI, Université de

324

Posters Long-Pathlength Infrared Absorption Measurements  

NLE Websites -- All DOE Office Websites (Extended Search)

3 3 Posters Long-Pathlength Infrared Absorption Measurements in the 8- to 14-µm Atmospheric Window: Self-Broadening Coefficient Data T. J. Kulp (a) and J. Shinn Geophysics and Environmental Research Program Lawrence Livermore National Laboratory Livermore, California Introduction The accurate characterization of the latent infrared (IR) absorption in the atmospheric window regions continues to be an area of research interest for the global climate modeling community. In the window between 8 and 14 µm, this absorption can be attributed primarily to water vapor. It consists of 1) weak lines originating from the edge of the water vapor pure rotational band (at low wavenumbers) and the trailing P-branch of the υ 2 rovibrational band (at the high-wavenumber boundary of the window); and 2) the

325

Atomic and Molecular Absorption at High Redshift  

E-Print Network (OSTI)

Strong constraints on possible variations in fundamental constants can be derived from HI 21-cm and molecular rotational absorption lines observed towards quasars. With the aim of forming a statistical sample of constraints we have begun a program of systematic searches for such absorption systems. Here we describe molecular rotational searches in 25 damped Lyman-alpha systems where, in many cases, we set optical depth limits an order of magnitude better than that required to detect the 4 known redshifted millimeter-wave absorbers. We also discuss the contributory factors in the detectability of HI 21-cm absorption, focusing on possible biases (e.g.low covering factors) in the currently known sample of absorbers and non-detections.

S. J. Curran; J. K. Webb; M. T. Murphy; Y. M. Pihlstrm

2004-05-14T23:59:59.000Z

326

Absolute absorption spectroscopy based on molecule interferometry  

E-Print Network (OSTI)

We propose a new method to measure the absolute photon absorption cross section of neutral molecules in a molecular beam. It is independent of our knowledge of the particle beam density, nor does it rely on photo-induced fragmentation or ionization. The method is based on resolving the recoil resulting from photon absorption by means of near-field matter-wave interference, and it thus applies even to very dilute beams with low optical densities. Our discussion includes the possibility of internal state conversion as well as fluorescence. We assess the influence of various experimental uncertainties and show that the measurement of absolute absorption cross sections is conceivable with high precision and using existing technologies.

Stefan Nimmrichter; Klaus Hornberger; Hendrik Ulbricht; Markus Arndt

2008-11-07T23:59:59.000Z

327

Continuous Photoelectric Absorption Cross Section of Helium  

Science Journals Connector (OSTI)

The continuous photoelectric absorption cross section of helium has been measured in the spectral region extending from 180 to 600 A with greater accuracy and the observations are found to agree with the calculations of Huang and Stewart and Wilkinson. A grazing incidence spectrometer with a photomultiplier was used for a single measurement at 180 A while the remaining measurements were carried out in a normal incidence spectrometer utilizing photographic techniques. Whereas in previous experiments the absorbing gas sample was allowed to fill the entire spectrometer chamber, in the current measurements the gas was confined to a small cell provided with sufficiently transparent windows. The use of an absorption cell reduces contamination and facilitates the measurement of gas pressures. The results indicate that the cross section varies from a value of 0.980.04 Mb at 180 A to a value of 7.70.3 Mb at the absorption edge located at 504 A.

D. J. Baker; Jr.; D. E. Bedo; D. H. Tomboulian

1961-12-01T23:59:59.000Z

328

X-Ray Absorption Spectroscopy of Transition Metal-Magnesium Hydride Thin  

NLE Websites -- All DOE Office Websites (Extended Search)

X-Ray Absorption Spectroscopy of Transition Metal-Magnesium Hydride Thin X-Ray Absorption Spectroscopy of Transition Metal-Magnesium Hydride Thin Films Title X-Ray Absorption Spectroscopy of Transition Metal-Magnesium Hydride Thin Films Publication Type Journal Article LBNL Report Number LBNL-50574 Year of Publication 2002 Authors Richardson, Thomas J., Baker Farangis, Jonathan L. Slack, Ponnusamy Nachimuthu, Rupert C. C. Perera, Nobumichi Tamura, and Michael D. Rubin Journal Journal of Alloys and Compounds Volume 356-357 Start Page 204 Pagination 204-207 Date Published 08/2003 Keywords A. hydrogen storage materials, NEXAFS, thin film s; C. EXAFS, x-ray diffraction Abstract Mixed metal thin films containing magnesium and a first-row transition element exhibit very large changes in both reflectance and transmittance on exposure to hydrogen gas. Changes in electronic structure and coordination of the magnesium and transition metal atoms during hydrogen absorption were studied using dynamic in situ transmission mode X-ray absorption spectroscopy. Mg K-edge and Ni, Co, and Ti L-edge spectra reflect both reversible and irreversible changes in the metal environments. A significant shift in the nickel L absorption edge shows it to be an active participant in hydride formation. The effect on cobalt and titanium is much less dramatic, suggesting that these metals act primarily as catalysts for formation of magnesium hydride.

329

Characteristics of fine particle growth events observed above a forested  

NLE Websites -- All DOE Office Websites (Extended Search)

Characteristics of fine particle growth events observed above a forested Characteristics of fine particle growth events observed above a forested ecosystem in the Sierra Nevada Mountains of California Title Characteristics of fine particle growth events observed above a forested ecosystem in the Sierra Nevada Mountains of California Publication Type Journal Article Year of Publication 2006 Authors Lunden, Melissa M., Douglas R. Black, Megan McKay, Kenneth L. Revzan, Allen H. Goldstein, and Nancy J. Brown Journal Aerosol Science and Technology Volume 40 Start Page 373 Issue 5 Pagination 373-388 Date Published 02/2006 ISSN 0278-6826 (Print), 1521-7388 (Online) Abstract Atmospheric aerosols from natural and anthropogenic processes have both primary and secondary origins, and can influence human health, visibility, and climate. One key process affecting atmospheric concentrations of aerosols is the formation of new particles and their subsequent growth to larger particle sizes. A field study was conducted at the Blodgett Forest Research Station in the Sierra Nevada Mountains of California from May through September of 2002 to examine the effect of biogenic volatile organic compounds on aerosol formation and processing. The study included in-situ measurements of concentration and biosphere-atmosphere flux of VOCs, ozone, aerosol size distribution, aerosol physical and optical properties, and meteorological variables. Fine particle growth events were observed on approximately 30 percent of the 107 days with complete size distribution data. Average particle growth rates measured during these events were 3.8 ± 1.9 nm hr-1. Correlations between aerosol properties, trace gas concentrations, and meteorological measurements were analyzed to determine conditions conducive to fine particle growth events. Growth events were typically observed on days with a lesser degree of anthropogenic influence, as indicated by lower concentrations of black carbon, carbon monoxide, and total aerosol volume. Days with growth events also had lower temperatures, increased wind speeds, and larger momentum flux. Measurements of ozone concentrations and ozone flux indicate that gas phase oxidation of biogenic volatile organic compounds occur in the canopy, strongly suggesting that a significant portion of the material responsible for the observed particle growth are oxidation products of naturally emitted very reactive organic compounds.

330

Potassium emission absorption system. Topical report 12  

SciTech Connect

The Potassium Emission Absorption System is one of the advanced optical diagnostics developed at Mississippi State University to provide support for the demonstration of prototype-scale coal-fired combustion magnetohydrodynamic (MHD) electrical power generation. Intended for application in the upstream of an MHD flow, the system directly measures gas temperature and neutral potassium atom number density through spectroscopic emission absorption techniques. From these measurements the electron density can be inferred from a statistical equilibrium calculation and the electron conductivity in the MHD channel found by use of an electron mobility model. The instrument has been utilized for field test measurements on MHD facilities for almost a decade and has been proven to provide useful measurements as designed for MHD nozzle, channel, and diffuser test sections. The theory of the measurements, a system description, its capabilities, and field test measurement results are reported here. During the development and application of the instrument several technical issues arose which when addressed advanced the state of the art in emission absorption measurement. Studies of these issues are also reported here and include: two-wavelength measurements for particle-laden flows, potassium D-line far wing absorption coefficient, bias in emission absorption measurements arising from dirty windows and misalignments, non-coincident multiwavelength emission absorption sampling errors, and lineshape fitting for boundary layer flow profile information. Although developed for NLHD application, the instrument could be applied to any high temperature flow with a resonance line in the 300 to 800 nm range, for instance other types of flames, rocket plumes or low temperature plasmas.

Bauman, L.E.

1995-04-01T23:59:59.000Z

331

Anomalous Light Absorption by Small Particles  

E-Print Network (OSTI)

A new type of resonant light absorption by a small particle (nanocluster) is reported. The problem cannot be described within the commonly used dipole scattering approximation and should be studied with methods based upon the exact Mie solution. It is shown that the absorption cross-section has giant maxima realized at small values of the imaginary part of the complex dielectric permittivity of the particle. The maxima are situated in the vicinity of the plasmon (polariton) resonances and correspond to the regions where the dissipative damping equals the radiative one. The case is similar to the recently introduced anomalous scattering [PRL vol. 97, 263902 (2006)] and exhibits similar peculiarities.

Michael I. Tribelsky

2009-12-18T23:59:59.000Z

332

Multi-plasmon absorption in graphene  

E-Print Network (OSTI)

We show that graphene possesses a strong nonlinear optical response in the form of multi-plasmon absorption, with exciting implications in classical and quantum nonlinear optics. Specifically, we predict that graphene nano-ribbons can be used as saturable absorbers with low saturation intensity in the far-infrared and terahertz spectrum. Moreover, we predict that two-plasmon absorption and extreme localization of plasmon fields in graphene nano-disks can lead to a plasmon blockade effect, in which a single quantized plasmon strongly suppresses the possibility of exciting a second plasmon.

Marinko Jablan; Darrick E. Chang

2015-01-21T23:59:59.000Z

333

Modified discrete random walk with absorption  

E-Print Network (OSTI)

We obtain expected number of arrivals, probability of arrival, absorption probabilities and expected time before absorption for a modified discrete random walk on the (sub)set of integers. In a [pqrs] random walk the particle can move one step forward or backward, stay for a moment in the same state or it can be absorbed immediately in the current state. M[pqrs] is a modified version, where probabilities on both sides of a multiple function barrier M are of different [pqrs] type.

Theo van Uem

2009-03-02T23:59:59.000Z

334

Crystal Structure and Characterization of Particulate Methane Monooxygenase from Methylocystis species Strain M  

SciTech Connect

Particulate methane monooxygenase (pMMO) is an integral membrane metalloenzyme that oxidizes methane to methanol in methanotrophic bacteria. Previous biochemical and structural studies of pMMO have focused on preparations from Methylococcus capsulatus (Bath) and Methylosinus trichosporium OB3b. A pMMO from a third organism, Methylocystis species strain M, has been isolated and characterized. Both membrane-bound and solubilized Methylocystis sp. strain M pMMO contain {approx}2 copper ions per 100 kDa protomer and exhibit copper-dependent propylene epoxidation activity. Spectroscopic data indicate that Methylocystis sp. strain M pMMO contains a mixture of Cu{sup I} and Cu{sup II}, of which the latter exhibits two distinct type 2 Cu{sup II} electron paramagnetic resonance (EPR) signals. Extended X-ray absorption fine structure (EXAFS) data are best fit with a mixture of Cu-O/N and Cu-Cu ligand environments with a Cu-Cu interaction at 2.52-2.64 {angstrom}. The crystal structure of Methylocystis sp. strain M pMMO was determined to 2.68 {angstrom} resolution and is the best quality pMMO structure obtained to date. It provides a revised model for the pmoA and pmoC subunits and has led to an improved model of M. capsulatus (Bath) pMMO. In these new structures, the intramembrane zinc/copper binding site has a different coordination environment from that in previous models.

Smith, Stephen M.; Rawat, Swati; Telser, Joshua; Hoffman, Brian M.; Stemmler, Timothy L.; Rosenzweig, Amy C. (WSU-MED); (NWU)

2012-02-08T23:59:59.000Z

335

Tuning the Electronic Absorption of Protein-Embedded All-trans-Retinal  

Science Journals Connector (OSTI)

...Probing and modeling the absorption...reagent to the PSB. A rapid disappearence...Expanding and upgrading automated preparation of biomolecular...structures for molecular simulations . Nucleic Acids...PDB2PQR: An automated pipeline for the...MOLREP: An automated program for molecular...

Wenjing Wang; Zahra Nossoni; Tetyana Berbasova; Camille T. Watson; Ipek Yapici; Kin Sing Stephen Lee; Chrysoula Vasileiou; James H. Geiger; Babak Borhan

2012-12-07T23:59:59.000Z

336

Harmonic wavelet analysis of modulated tunable diode laser absorption spectroscopy signals  

E-Print Network (OSTI)

of the direct absorption characteristics of atomic or molecular absorption lines. This is accomplishedHarmonic wavelet analysis of modulated tunable diode laser absorption spectroscopy signals Hong analyses of tunable diode laser absorption spectroscopy signals were performed. The absorption spectroscopy

Cheng, Harry H.

337

Direct fired absorption machine flue gas recuperator  

DOE Patents (OSTI)

A recuperator which recovers heat from a gas, generally the combustion gas of a direct-fired generator of an absorption machine. The recuperator includes a housing with liquid flowing therethrough, the liquid being in direct contact with the combustion gas for increasing the effectiveness of the heat transfer between the gas and the liquid.

Reimann, Robert C. (Lafayette, NY); Root, Richard A. (Spokane, WA)

1985-01-01T23:59:59.000Z

338

Corrosion inhibitor for aqueous ammonia absorption system  

DOE Patents (OSTI)

A method is described for inhibiting corrosion and the formation of hydrogen and thus improving absorption in an ammonia/water absorption refrigeration, air conditioning or heat pump system by maintaining the hydroxyl ion concentration of the aqueous ammonia working fluid within a selected range under anaerobic conditions at temperatures up to 425 F. This hydroxyl ion concentration is maintained by introducing to the aqueous ammonia working fluid an inhibitor in an amount effective to produce a hydroxyl ion concentration corresponding to a normality of the inhibitor relative to the water content ranging from about 0.015 N to about 0.2 N at 25 C. Also, working fluids for inhibiting the corrosion of carbon steel and resulting hydrogen formation and improving absorption in an ammonia/water absorption system under anaerobic conditions at up to 425 F. The working fluids may be aqueous solutions of ammonia and a strong base or aqueous solutions of ammonia, a strong base, and a specified buffer. 5 figs.

Phillips, B.A.; Whitlow, E.P.

1998-09-22T23:59:59.000Z

339

SUPPLY-SIDE OPTIMIZATION : MAXIMIZING ABSORPTIVE RATES  

E-Print Network (OSTI)

-benefit optimization of the ingestion process alone . We have continued to develop and modify chemical reactor theoryI l SUPPLY-SIDE OPTIMIZATION : MAXIMIZING ABSORPTIVE RATES W. Brian Dade, Peter A. Jumars engineering aimed at the analysis and design of chemical reactors to analyze the process of digestion

Jumars, Pete

340

Absorption on horizon-wrapped branes  

E-Print Network (OSTI)

We compute the absorption cross section of space-time scalars on a static D2 rane, in global coordinates, wrapped on the S^2 of an AdS_2 X S^2 X CY_3 geometry. We discuss its relevance for the construction of the dual quantum mechanics of Calabi-Yau black holes.

S. Ansari; G. Panotopoulos; I. Sachs

2009-01-09T23:59:59.000Z

Note: This page contains sample records for the topic "absorption fine structure" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

Corrosion inhibitor for aqueous ammonia absorption system  

DOE Patents (OSTI)

A method of inhibiting corrosion and the formation of hydrogen and thus improving absorption in an ammonia/water absorption refrigeration, air conditioning or heat pump system by maintaining the hydroxyl ion concentration of the aqueous ammonia working fluid within a selected range under anaerobic conditions at temperatures up to 425.degree. F. This hydroxyl ion concentration is maintained by introducing to the aqueous ammonia working fluid an inhibitor in an amount effective to produce a hydroxyl ion concentration corresponding to a normality of the inhibitor relative to the water content ranging from about 0.015 N to about 0.2 N at 25.degree. C. Also, working fluids for inhibiting the corrosion of carbon steel and resulting hydrogen formation and improving absorption in an ammonia/water absorption system under anaerobic conditions at up to 425.degree. F. The working fluids may be aqueous solutions of ammonia and a strong base or aqueous solutions of ammonia, a strong base, and a specified buffer.

Phillips, Benjamin A. (Benton Harbor, MI); Whitlow, Eugene P. (St. Joseph, MI)

1998-09-22T23:59:59.000Z

342

Microwave Absorption Spectrum of ND3  

Science Journals Connector (OSTI)

The main J=K sequence of inversion lines of the ND3 absorption spectrum were observed and measured between 1589 and 2540 Mc. Quantum numbers up to J,K=18,18 were assigned by the use of an approximate empirical formula.

R. G. Nuckolls; L. J. Rueger; Harold Lyons

1953-03-01T23:59:59.000Z

343

Broadband solar absorption enhancement via periodic  

E-Print Network (OSTI)

Broadband solar absorption enhancement via periodic nanostructuring of electrodes Michael M. Adachi Department of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario M5S 3G4, Canada, 2 Province, 230009, P. R. China. Solution processed colloidal quantum dot (CQD) solar cells have great

344

High Shear Deformation to Produce High Strength and Energy Absorption in Mg Alloys  

SciTech Connect

Magnesium alloys have the potential to reduce the mass of transportation systems however to fully realize the benefits it must be usable in more applications including those that require higher strength and ductility. It has been known that fine grain size in Mg alloys leads to high strength and ductility. However, the challenge is how to achieve this optimal microstructure in a cost effective way. This work has shown that by using optimized high shear deformation and second phase particles of Mg2Si and MgxZnZry the energy absorption of the extrusions can exceed that of AA6061. The extrusion process under development described in this presentation appears to be scalable and cost effective. In addition to process development a novel modeling approach to understand the roles of strain and state-of-strain on particle fracture and grain size control has been developed

Joshi, Vineet V.; Jana, Saumyadeep; Li, Dongsheng; Garmestani, Hamid; Nyberg, Eric A.; Lavender, Curt A.

2014-02-01T23:59:59.000Z

345

Optimal design of aperiodic, vertical silicon nanowire structures for photovoltaics  

Science Journals Connector (OSTI)

We design a partially aperiodic, vertically-aligned silicon nanowire array that maximizes photovoltaic absorption. The optimal structure is obtained using a random walk algorithm...

Lin, Chenxi; Povinelli, Michelle L

2011-01-01T23:59:59.000Z

346

Process for preparing fine grain titanium carbide powder  

DOE Patents (OSTI)

A method for preparing finely divided titanium carbide powder in which an organotitanate is reacted with a carbon precursor polymer to provide an admixture of the titanium and the polymer at a molecular-level due to a crosslinking reaction between the organotitanate and the polymer. The resulting gel is dried, pyrolyzed to drive off volatile components and provide carbon. The resulting solids are then heated at an elevated temperature to convert the titanium and carbon to high-purity titanium carbide powder in a submicron size range.

Janey, Mark A. (Concord, TN)

1986-01-01T23:59:59.000Z

347

Acoustic Performance Analysis of Bionic Coupling Multi-layer Structure Yonghua Wang1,2,a  

E-Print Network (OSTI)

coefficients and analyze the influences of different parameters of each layer on absorption coefficients. Laboratory of Tribology and System Dynamics, Ecole Centrale de Lyon, Ecully 69134, France 3. Laboratory bionic method to develop a new sound absorption structure. Inspired by the coupling absorption structure

Boyer, Edmond

348

Effects of thermal motion on electromagnetically induced absorption  

E-Print Network (OSTI)

We describe the effect of thermal motion and buffer-gas collisions on a four-level closed N system interacting with strong pump(s) and a weak probe. This is the simplest system that experiences electromagnetically induced absorption (EIA) due to transfer of coherence via spontaneous emission from the excited to ground state. We investigate the influence of Doppler broadening, velocity-changing collisions (VCC), and phase-changing collisions (PCC) with a buffer gas on the EIA spectrum of optically active atoms. In addition to exact expressions, we present an approximate solution for the probe absorption spectrum, which provides physical insight into the behavior of the EIA peak due to VCC, PCC, and wave-vector difference between the pump and probe beams. VCC are shown to produce a wide pedestal at the base of the EIA peak, which is scarcely affected by the pump-probe angular deviation, whereas the sharp central EIA peak becomes weaker and broader due to the residual Doppler-Dicke effect. Using diffusion-like equations for the atomic coherences and populations, we construct a spatial-frequency filter for a spatially structured probe beam and show that Ramsey narrowing of the EIA peak is obtained for beams of finite width.

E. Tilchin; O. Firstenberg; A. D. Wilson-Gordon

2011-07-04T23:59:59.000Z

349

Coal surface control for advanced physical fine coal cleaning technologies  

SciTech Connect

This final report presents the research work carried out on the Coal Surface Control for Advanced Physical Fine Coal Cleaning Technologies project, sponsored by the US Department of Energy, Pittsburgh Energy Technology Center (DOE/PETC). The project was to support the engineering development of the selective agglomeration technology in order to reduce the sulfur content of US coals for controlling SO[sub 2] emissions (i.e., acid rain precursors). The overall effort was a part of the DOE/PETCs Acid Rain Control Initiative (ARCI). The overall objective of the project is to develop techniques for coal surface control prior to the advanced physical fine coal cleaning process of selective agglomeration in order to achieve 85% pyrite sulfur rejection at an energy recovery greater than 85% based on run-of-mine coal. The surface control is meant to encompass surface modification during grinding and laboratory beneficiation testing. The project includes the following tasks: Project planning; methods for analysis of samples; development of standard beneficiation test; grinding studies; modification of particle surface; and exploratory R D and support. The coal samples used in this project include three base coals, Upper Freeport - Indiana County, PA, Pittsburgh NO. 8 - Belmont County, OH, and Illinois No. 6 - Randolph County, IL, and three additional coals, Upper Freeport - Grant County- WV, Kentucky No. 9 Hopkins County, KY, and Wyodak - Campbell County, WY. A total of 149 drums of coal were received.

Morsi, B.I.; Chiang, S.H.; Sharkey, A.; Blachere, J.; Klinzing, G.; Araujo, G.; Cheng, Y.S.; Gray, R.; Streeter, R.; Bi, H.; Campbell, P.; Chiarlli, P.; Ciocco, M.; Hittle, L.; Kim, S.; Kim, Y.; Perez, L.; Venkatadri, R.

1992-01-01T23:59:59.000Z

350

Effective Absorption Enhancement in Small Molecule Organic Solar Cells by Employing Trapezoid Gratings  

E-Print Network (OSTI)

We demonstrate the optical absorption has been enhanced in the small molecule organic solar cells by employing trapezoid grating structure. The enhanced absorption is mainly attributed to both waveguide modes and surface plasmon modes, which has been simulated by using finite-difference time-domain method. The simulated results show that the surface plasmon along the semitransparent metallic Ag anode is excited by introducing the periodical trapezoid gratings, which induce high intensity field increment in the donor layer. Meanwhile, the waveguide modes result a high intensity field in acceptor layer. The increment of field improves the absorption of organic solar cells, significantly, which has been demonstrated by simulating the electrical properties. The simulated results exhibiting 31 % increment of the short-circuit current has been achieved in the optimized device, which is supported by the experimental measurement. The power conversion efficiency of the grating sample obtained in experiment exhibits an...

Chun-Ping, Xiang; Yu, Jin; Bin-Zong, Xu; Wei-Min, Wang; Xin, Wei; Guo-Feng, Song; Yun, Xu

2013-01-01T23:59:59.000Z

351

Analysis of Cyclotron Absorption in Bismuth  

Science Journals Connector (OSTI)

Classical magnetoionic theory is used for calculating the absorption of microwaves in bismuth in the presence of a dc magnetic field. The detailed calculations are based on the models of the energy surfaces in momentum space for holes and electrons obtained from de Haas-van Alphen and galvanomagnetic experiments. Expressions are derived for the conductivities and resonance masses. Numerical computations of absorption vs magnetic field are made using the data from Shoenberg's de Haas-van Alphen experiments for the masses of the electrons. Since some of the experimental data for the holes is incomplete, the analysis takes this into account through the use of several choices of hole masses. The results are compared with those of preliminary microwave experiments. The limitations of the analysis, which neglects the anomalous skin effect and possible anisotropy of scattering, are discussed.

Benjamin Lax, K. J. Button, H. J. Zeiger, and Laura M. Roth

1956-05-01T23:59:59.000Z

352

Solar absorption cooling in South China  

SciTech Connect

This paper summarizes a major energy research project carried out in China and Hong Kong over the last ten years. It covers medium temperature solar collectors, cooling and hot water supply systems and describes the design and manufacture of a novel two-stage absorption Li-Br chiller. One of the primary objectives of this project was to encourage technology transfer to China of the manufacturing processes relating to medium temperature solar collectors.

Ward, H.S.; Chu, C.Y. [Lingnan College/Hong Kong Polytechnic, Hong Kong (Hong Kong); Huang, Z.C.; Xia, W. [Guangzhou Inst. of Energy Conversion (China)

1995-11-01T23:59:59.000Z

353

The absorption of ultrasonic waves in liquids  

E-Print Network (OSTI)

Vee ~ ~ ~ ~ a ~ ~ ~ ~ ~ ~ a ~ e ~ ~ ~ ~ a ~ ~ ea ~ ~ ~ eee ~ ~ ~ ~ ~ ~ ea ~ ~ ~ ~ 2 ~ ?easursasnt of ths Prop-:. ties of:asss and Liquids by Ultrasonicseae ~ ~ ~ ~ ~ e ~ ~ ~ ~ ~ ~ ~ ~ e ~ ~ dies Borne erscsnt Theories ConcsrrrinS the Oisorsparrcy 3e tween... ~ ~ ~ ~ ~ ~ ~ o 3Q VI, Plot of' Los A /A vs~ Sound Path Length Ital ZthoI' 1Mox' Ppoalul'oe ~ ~ a ~ y ~ ~ s ~ ~ ~ ~ ~ ~ e ~ ~ ~ e s ~ ~ ~ ~ e ~ ~ a ~ ~ 3) xxeasuraaents oa the absorption of high frequency souad. waves ia liquids axe useful ia studying...

Hudson, Paul A

2012-06-07T23:59:59.000Z

354

Oral absorption of apramycin in newborn calves  

E-Print Network (OSTI)

as a model is the Journal of Veterinary Pharmacology and Therapeutics. animals in other species may also have a larger extent of absorption than older animals. Apramycin is an aminoglycoside antibiotic which is active against some gram... to healthy newborn (less than 24 hours old) veal calves than calves that are 3 weeks old. If the drug is absorbed, it indicates that neonatal calves have a greater capacity to absorb a poorly absorbed drug, thereby potentiating possible problems...

Buck, Joan Marjorie

2012-06-07T23:59:59.000Z

355

Impedance Matched Absorptive Thermal Blocking Filters  

E-Print Network (OSTI)

We have designed, fabricated and characterized absorptive thermal blocking filters for cryogenic microwave applications. The transmission line filter's input characteristic impedance is designed to match $50\\,\\Omega$ and its response has been validated from 0-to-50\\,GHz. The observed return loss in the 0-to-20\\,GHz design band is greater than $20\\,$dB and shows graceful degradation with frequency. Design considerations and equations are provided that enable this approach to be scaled and modified for use in other applications.

Wollack, E J; Rostem, K; U-Yen, K

2014-01-01T23:59:59.000Z

356

CO2 Capture by Absorption with Potassium Carbonate  

SciTech Connect

The objective of this work is to improve the process for CO{sub 2} capture by alkanolamine absorption/stripping by developing an alternative solvent, aqueous K{sub 2}CO{sub 3} promoted by piperazine. Modeling of stripper performance suggests that vacuum stripping may be an attractive configuration for all solvents. Flexipac 1Y structured packing performs in the absorber as expected. It provides twice as much mass transfer area as IMTP No.40 dumped packing. Independent measurements of CO{sub 2} solubility give a CO{sub 2} loading that is 20% lower than that Cullinane's values with 3.6 m PZ at 100-120 C. The effective mass transfer coefficient (K{sub G}) in the absorber with 5 m K/2.5 m PZ appears to be 0 to 30% greater than that of 30 wt% MEA.

Gary T. Rochelle; Marcus Hilliard; Eric Chen; Babatunde Oyenekan; Ross Dugas; John McLees; Andrew Sexton; Daniel Ellenberger

2005-10-26T23:59:59.000Z

357

CO2 Capture by Absorption with Potassium Carbonate  

E-Print Network (OSTI)

CO2 Capture by Absorption with Potassium Carbonate First Quarterly Report 2006 Quarterly Progress the process for CO2 capture by alkanolamine absorption/stripping by developing an alternative solvent, aqueous

Rochelle, Gary T.

358

Determination of Mercury in Soils by Flameless Atomic Absorption Spectrometry  

Science Journals Connector (OSTI)

...chemical analysis exploration flameless geochemical methods mercury...Determination of Mercury in Soils by Flameless Atomic Absorption Spectrometry...Determinationof Mercury in Soilsby Flameless Atomic AbsorptionSpectrometry...the mercuryre- RF Induction Heater work coils 1. Carriergas...

B. G. Weissberg

359

Direct Refrigeration from Heat Recovery Using 2-Stage Absorption Chillers  

E-Print Network (OSTI)

absorption chiller which can produce chilled water 44% more efficiently than the conventional single stage absorption chillers. The new 2-stage parallel flow system makes the chiller package more compact, more efficient, and easier to operate. Many types...

Hufford, P. E.

1983-01-01T23:59:59.000Z

360

Triple effect absorption chiller utilizing two refrigeration circuits  

SciTech Connect

This patent describes a heat absorption method for an absorption chiller. It comprises: providing a firs absorption system circuit for operation within a first temperature range, providing a second absorption system circuit for operation within a second temperature range; heat exchanging refrigerant and absorber solution; thermal communication with an external heat load. This patent describes a heat absorption apparatus for use as an absorption chiller. It includes: a first absorption system circuit for operation within a first temperature range; a second absorption system circuit for operation within a second temperature range which has a lower maximum temperature relative to the first temperature range; the first circuit having generator means, condenser means, evaporator means, and absorber means operatively connected together; the second circuit having generator means condenser means, evaporator means, and absorber means operative connected together; and the first circuit condenser means and the first circuit absorber means being in heat exchange communication with the second circuit generator means.

DeVault, R.C.

1988-03-22T23:59:59.000Z

Note: This page contains sample records for the topic "absorption fine structure" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

Modular simulation and thermodynamic analysis of absorption heat pumps  

Science Journals Connector (OSTI)

The absorption technique for refrigeration or air conditioning is ... using CFCs as working fluids in the conventional chillers based on the vapor compression technique. The absorption systems use thermal energy ...

Sana El May; Ismail Boukholda; Ahmed Bellagi

2010-04-01T23:59:59.000Z

362

Atomic Absorption Spectrometry Perkin Elmer 500, Chemistry & Biochemistry  

E-Print Network (OSTI)

Atomic Absorption Spectrometry · Perkin Elmer 500, Chemistry & Biochemistry · Perkin Elmer 560 AA-star stopped flow with absorption, fluorescence and circular dichroism detection · KinTek quench flow apparatus

Gruner, Daniel S.

363

Energy Absorption from Ocean Waves: A Free Ride for Cetaceans  

Science Journals Connector (OSTI)

...cetaceans are capable of absorbing energy from ocean waves for propulsion. The extent of...following seas. Consequences of wave-energy absorption for energetics of...following seas. Consequences of wave-energy absorption for energetics of...

1990-01-01T23:59:59.000Z

364

TENDER ENERGY X-RAY ABSORPTION  

NLE Websites -- All DOE Office Websites (Extended Search)

TENDER ENERGY X-RAY ABSORPTION TENDER ENERGY X-RAY ABSORPTION SPECTROSCOPY (TES) Project Team: S. Bare 1,2 , J. Brandes 3 , T. Buonassisi 4 , J. Chen 5,2 , M. Croft 6 , E. DiMasi 7 , A. Frenkel 8,2 , D. Hesterberg 9 , S. Hulbert 7,2 , S. Khalid 7 , S. Myneni 10 , P. Northrup 7,11 , E.T. Rasbury 11 , B. Ravel 12 , R. Reeder 11 , J. Rodriguez 7,2 , D. Sparks 5,13 , V. Stojanoff 7 , G. Waychunas 14 1 UOP LLC, 2 Synchrotron Catalysis Consortium, 3 Skidaway Inst. of Oceanography, 4 MIT Laboratory for Photovoltaics Research, 5 Univ. of Delaware, 6 Rutgers Univ., 7 Brookhaven National Lab, 8 Yeshiva Univ., 9 North Carolina State Univ., 10 Princeton Univ., 11 Stony Brook Univ., 12 NIST, 13 Delaware Environmental Inst., 14 Lawrence Berkeley National Lab TECHNIQUES: High performance and in-situ X-ray absorption spectroscopy and spatially-resolved XAS of

365

Optical absorption at its onset in sputter deposited hafnia-titania nanolaminates  

SciTech Connect

The onset of the fundamental optical absorption edge in sputter deposited HfO{sub 2}-TiO{sub 2} nanolaminate films grown on unheated substrates was investigated. Three bilayer architectures were examined, representing overall film chemistry from 0.51 to 0.72 atom fraction Hf. The goal was to determine the absorption coefficient, {alpha}(E), versus incident photon energy, E, and to model this dependence in terms of the absorption behavior of specific functional units within the nanolaminate. Persistence and amalgamation models were applied, representing the extremes of segregated cation and mixed cation structures, respectively, and both were found to be unsatisfactory. Consideration of physiochemical data for the nanolaminates led to the development of a modified persistence model for absorption. {alpha}(E) was decomposed into contributions from (I) broad (9 nm-thick) interfacial regions that were chiefly o-HfTiO{sub 4}, and (II) regions remote from interfaces that contained material based on a highly defective m-HfO{sub 2} lattice. The absorption edge at its onset in all nanolaminates was determined by short-range atomic order characteristic of o-HfTiO{sub 4}. An indirect band gap of E{sub G}=3.25{+-}0.02 eV was determined for this compound.

Cisneros-Morales, Massiel Cristina; Aita, Carolyn Rubin [Department of Chemistry and Biochemistry, University of Wisconsin-Milwaukee, P.O. Box 413, Milwaukee, Wisconsin 53201 (United States)

2010-12-15T23:59:59.000Z

366

HI 21cm Absorption at $z \\sim 2.347$ towards PKS B0438-436  

E-Print Network (OSTI)

We report the detection of redshifted HI~21cm absorption in the $z \\sim 2.347$ damped Lyman-$\\alpha$ absorber (DLA) towards PKS B0438-436, with the Green Bank Telescope. This is the second-highest redshift at which 21cm absorption has been detected in a DLA. The absorption extends over $\\sim 60$ km/s and has two distinct components, at $z = 2.347477 (12)$ and $z = 2.347869 (20)$. A similar velocity structure is seen in optical metal lines, although the peak absorption here is offset by $\\sim 11$ km/s from the peak in the 21cm line. We obtain a high spin temperature $T_s \\sim (886 \\pm 248) \\times (f/0.58)$ K, using a covering factor estimated from 2.3 GHz VLBI data. However, the current data cannot rule out a low spin temperature. The non-detection of CO 3-2 absorption places the upper limit $N_{CO} < 3.8 \\times 10^{15} \\times (T_x/10)$ cm$^{-2}$ on the CO column density.

N. Kanekar; R. Subrahmanyan; S. L. Ellison; W. M. Lane; J. N. Chengalur

2006-05-14T23:59:59.000Z

367

Split-flow regeneration in absorptive air separation  

DOE Patents (OSTI)

A chemical absorptive separation of air in multiple stage of absorption and desorption is performed with partial recycle of absorbent between stages of desorption necessary to match equilibrium conditions in the various stages of absorption. This allows reduced absorbent flow, reduced energy demand and reduced capital costs. 4 figs.

Weimer, R.F.

1987-11-24T23:59:59.000Z

368

Split-flow regeneration in absorptive air separation  

DOE Patents (OSTI)

A chemical absorptive separation of air in multiple stage of absorption and desorption is performed with partial recycle of absorbent between stages of desorption necessary to match equilibrium conditions in the various stages of absorption. This allows reduced absorbent flow, reduced energy demand and reduced capital costs.

Weimer, Robert F. (Allentown, PA)

1987-01-01T23:59:59.000Z

369

Atomic Absorption Method Guide Zn in Copper Alloys  

E-Print Network (OSTI)

Atomic Absorption Method Guide Zn in Copper Alloys Principle The sample is digested in nitric/hydrochloric acid, and zinc is determined by flame atomic absorption spectrometry using an air-acetylene flame · Copper Alloys · Zinc · Flame · Atomic Absorption Method Guide: 40158 #12;©2008 Thermo Fisher Scientific

Wells, Mathew G. - Department of Physical and Environmental Sciences, University of Toronto

370

Laser Locking with Doppler-free Saturated Absorption Spectroscopy  

E-Print Network (OSTI)

there are many ways to stabilize the frequency of a laser, atomic absorption lines are particularly accurate are made, it becomes possible to resolve the saturated absorption lines that correspond to specific atomic absorption spectroscopy. This affects the number of atoms in the ground state and excited state

Novikova, Irina

371

LATTICE DYNAMICS NUCLEAR RESONANCE ABSORPTION OF GAMMA-RADIATION  

E-Print Network (OSTI)

crystalline domains are taken. Absorption studies of the dynamics of atomic motions in condensed matterLATTICE DYNAMICS NUCLEAR RESONANCE ABSORPTION OF GAMMA-RADIATION AND COHERENT DECAY MODES Institut Max von Laue-Paul Langevin, Grenoble, France R6sumb. -La section efficace pour l'absorption nucleaire

Paris-Sud XI, Université de

372

Colossal Absorption of Molecules Inside Single Terahertz Nanoantennas  

E-Print Network (OSTI)

Colossal Absorption of Molecules Inside Single Terahertz Nanoantennas Hyeong-Ryeol Park, Kwang Jun: Molecules have extremely small absorption cross sections in the terahertz range even under resonant to be enhanced by >103 accompanied by a colossal absorption coefficient of 170 000 cm-1 . Tens of nanograms

Park, Namkyoo

373

Woodhead Publishing Limited, 2013 Tunable mid-infrared laser absorption  

E-Print Network (OSTI)

absorption spectroscopy F. K. TITTEL and R. LEWICKI, Rice University, USA DOI: 10 absorption spectroscopy (LAS) and recent examples of their use in field deployable optical instruments detection methods that include several types of multipass gas absorption cells with the option to apply

374

On the Absorption and Emission Properties of Interstellar Grains  

E-Print Network (OSTI)

Our current understanding of the absorption and emission properties of interstellar grains are reviewed. The constraints placed by the Kramers-Kronig relation on the wavelength-dependence and the maximum allowable quantity of the dust absorption are discussed. Comparisons of the opacities (mass absorption coefficients) derived from interstellar dust models with those directly estimated from observations are presented.

Aigen Li

2005-03-25T23:59:59.000Z

375

HHFW absorption in Neutral-Beam heated NSTX plasmas  

E-Print Network (OSTI)

HHFW absorption in Neutral-Beam heated NSTX plasmas B. LeBlanc, M. Podestà, W. Heidbrink XP -1012 ions Need to characterize RF absorption as a function of RF phasing, L vs. H-mode plasmas, outer gap, optimized for FIDA measurements · Similar to 2008 FIDA experiment on RF absorption by fast ions · NB sources

Princeton Plasma Physics Laboratory

376

QSO Metal Absorption Systems at High Redshift Toru Misawa1  

E-Print Network (OSTI)

QSO Metal Absorption Systems at High Redshift Toru Misawa1 , Nobunari Kashikawa2 , Youichi Ohyama2 Abstract. Quasar absorption systems give us useful information about very faint objects that we cannot detect directly. For example, metal absorption systems are generally provided by star formation

Iye, Masanori

377

Absorption of Carbon Dioxide in Aqueous Piperazine/Methyldiethanolamine  

E-Print Network (OSTI)

Absorption of Carbon Dioxide in Aqueous Piperazine/Methyldiethanolamine Sanjay Bishnoi and Gary T dioxide absorption in 0.6 M piperazine PZ r4 M methyldiethanolamine ( )MDEA was measured in a wetted wall loading. The absorption rate did not follow pseudo first-order beha®ior except at ®ery low loading. All

Rochelle, Gary T.

378

Optical absorption spectra and geometric e ects in higher fullerenes  

E-Print Network (OSTI)

Optical absorption spectra and geometric e ects in higher fullerenes (Running head: Optical absorption in higher fullerenes) Kikuo Harigaya and Shuji Abe Physical Science Division, Electrotechnical of their amplitudes at the pentagons. The oscillator strengths of projected absorption almost accord with those

Harigaya, Kikuo

379

Does the photon-diffusion coefficient depend on absorption?  

E-Print Network (OSTI)

Does the photon-diffusion coefficient depend on absorption? T. Durduran and A. G. Yodh Department independent of absorption, i.e., D0 v/3 s . After presentation of the general theoretical arguments underlying this assertion, Monte Carlo simulations are performed and explicitly reveal that the absorption- independent

Boas, David

380

SPECTRA OF CRITICAL EXPONENTS IN NONLINEAR HEAT EQUATIONS WITH ABSORPTION  

E-Print Network (OSTI)

SPECTRA OF CRITICAL EXPONENTS IN NONLINEAR HEAT EQUATIONS WITH ABSORPTION V.A. GALAKTIONOV AND P of the classical porous medium equation with absorption u t = #1;u m u p in R N #2; R+ change their large-time behaviour at the critical absorption exponent p 0 = m+2=N . We show that, actually, there exists an in#12

Bath, University of

Note: This page contains sample records for the topic "absorption fine structure" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
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381

Assertion Absorption in Object Queries over Knowledge Bases  

E-Print Network (OSTI)

Assertion Absorption in Object Queries over Knowledge Bases Jiewen Wu, Alexander Hudek, David Toman contribute to this development by introducing a novel adaptation of bi- nary absorption for DL knowledge satisfaction problems in which consistency is assumed, and then revisit absorption in this new setting. To date

Waterloo, University of

382

Photodetector with absorbing region having resonant periodic absorption between reflectors  

DOE Patents (OSTI)

A photodetector is disclosed that is responsive to a wavelength or wavelengths of interest which have heretofore been unrealized. The photodetector includes a resonant cavity structure bounded by first and second reflectors, the resonant cavity structure being resonant at the wavelength or wavelengths of interest for containing a plurality of standing waves therein. The photodetector further includes a radiation absorbing region disposed within the resonant cavity structure, the radiation absorbing region including a plurality of radiation absorbing layers spaced apart from one another by a distance substantially equal to a distance between antinodes of adjacent ones of the standing waves. Each of radiation absorbing layers is spatially positioned at a location of one of the antinodes of one of the standing waves such that radiation absorption is enhanced. The radiation absorbing layers may be either bulk layers or quantum wells includes a plurality of layers, each of which is comprised of a strained layer of InGaAs. Individual ones of the InGaAs layers are spaced apart from one another by a GaAs barrier layer. 11 figs.

Bryan, R.P.; Olbright, G.R.; Brennan, T.M.; Tsao, J.Y.

1995-02-14T23:59:59.000Z

383

An investigation of the electronic structure of Cu{sub 2}FeSn{sub 3-x}Ti{sub x}S{sub 8} (0{<=}x{<=}3) thiospinel spin-crossover materials by X-ray absorption spectroscopy and electronic structure calculations  

SciTech Connect

The spin-crossover (SCO) transition is an interesting phenomenon in which a metal center transitions from a low-spin state to a high-spin state (or vice versa) upon some external perturbation. Only a few studies have investigated the SCO transition in crystalline compounds and the Cu{sub 2}FeSn{sub 3-x}Ti{sub x}S{sub 8} thiospinels present an opportunity for such a study. Fe K-XANES has been used to investigate the changes in the electronic structure of these materials as Ti is substituted for Sn. The room-temperature Fe K-edge XANES spectra showed that the pre-edge intensity increased with increasing Ti content as a result of the Fe-S bond becoming more covalent. Ti K- and S K-edge XANES spectra confirmed this analysis. Electronic structure calculations were also performed to aid in the interpretation of the XANES spectra. Temperature-dependent Fe K-edge XANES spectra were further collected to study the SCO transition and showed that the main-edge features decreased in intensity with decreasing temperature, corresponding to variations in the average Fe{sup 2+} spin-state. - Graphical abstract: The Cu{sub 2}FeSn{sub 3-x}Ti{sub x}S{sub 8} spin-crossover materials have been investigated by XANES. The pre-edge region of the Fe K-edge spectra increases with greater Ti incorporation because of the Fe-S bonds becoming more covalent. Highlights: Black-Right-Pointing-Pointer Cu{sub 2}FeSn{sub 3-x}Ti{sub x}S{sub 8} thiospinels were investigated by XANES. Black-Right-Pointing-Pointer The covalency of the Fe-S and Ti-S bonds increases with greater Ti incorporation. Black-Right-Pointing-Pointer T-dependent Fe K-edge XANES spectra were collected to investigate SCO transitions. Black-Right-Pointing-Pointer Covalent bonding makes study of the SCO transition difficult by Fe K-edge XANES. Black-Right-Pointing-Pointer The bonding interactions were investigated through examination of S K-edge spectra.

Hayes, John R. [Department of Chemistry, University of Saskatchewan, Saskatoon, SK, Canada S7N 5C9 (Canada); Grosvenor, Andrew P., E-mail: andrew.grosvenor@usask.ca [Department of Chemistry, University of Saskatchewan, Saskatoon, SK, Canada S7N 5C9 (Canada)

2013-01-15T23:59:59.000Z

384

Fine tracking system for balloon-borne telescopes  

E-Print Network (OSTI)

We present the results of a study along with a first prototype of a high precision system (? 1 arcsec) for pointing and tracking light (near-infrared) telescopes on board stratospheric balloons. Such a system is essentially composed by a star sensor and by a star tracker, able to recognize the field and to adequately track the telescope, respectively. We present the software aimed at processing the star sensor image and the predictive algorithm that allows the fine tracking of the source at a sub-pixel level. The laboratory tests of the system are described and its performance is analyzed. We demonstrate how such a device, when used at the focal plane of enough large telescopes (2-4m, F/10), is capable to provide (sub-)arcsec diffraction limited images in the near infrared bands.

Ricci, M; Lorenzetti, D

2011-01-01T23:59:59.000Z

385

Interlaboratory comparison of advanced fine-coal beneficiation processes  

SciTech Connect

The Pittsburgh Energy Technology Center (PETC) recently completed three interlaboratory test programs involving 21 developers of advanced fine-coal-cleaning processes. The processes consisted of specific gravity separation (aqueous or heavy-liquid), electrostatic separation (dry), advanced froth flotation, selective agglomeration, and surface modification (gas). The participating organizations received representative samples of Illinois No. 6, Pittsburgh, and Upper Freeport bed coals. They ground them to a size appropriate for their particular process and then treated each coal. Their goal was to produce a clean coal with 2--3{percent} ash while recovering maximum energy. The products were returned to the PETC for analysis and performance evaluation. This paper will discuss the processes involved in the three test programs and present the results of the beneficiation tests. 4 refs., 4 figs., 3 tabs.

Jacobsen, P.S. (Burns and Roe Services Corp., Pittsburgh, PA (USA)); Killmeyer, R.P.; Hucko, R.E. (USDOE Pittsburgh Energy Technology Center, PA (USA))

1989-12-01T23:59:59.000Z

386

SPECIES DETERMINATION OF ORGANOMETALLIC COMPOUNDS USING ZEEMAN ATOMIC ABSORPTION SPECTROSCOPY WITH LIQUID CHROMATOGRAPHY  

E-Print Network (OSTI)

Compounds Using Zeeman Atomic Absorption Spectroscopy WithCompounds Using Zeeman ,Atomic Absorption Spectroscopy withcapabilities of Zeeman atomic absorption spectroscopy (ZAA)

Koizumi, H.

2011-01-01T23:59:59.000Z

387

X-RAY ABSORPTION SPECTROSCOPY FOR THE CHEMICAL CHARACTERIZATION OF ATMOSPHERIC AEROSOLS  

E-Print Network (OSTI)

November 11-16 9 1979 X-RAY ABSORPTION SPECTROSCOPY FOR THEUniversity of California. ABSORPTION SPECTROSCOPY FOR THEand x-ray emission and absorption spectroscopy. The first

Jaklevic, J. M.

2011-01-01T23:59:59.000Z

388

Absorption and scattering by long and randomly oriented linear chains of spheres  

E-Print Network (OSTI)

experimental measurements absorption and scattering cross-C. Bohren and D. Huffman, Absorption and Scattering of LightScattering and absorption of light by nonspherical

Lee, Euntaek; Pilon, Laurent

2013-01-01T23:59:59.000Z

389

INFRARED ABSORPTION SPECTROSCOPY OF CARBON MONOXIDE ON NICKEL FILMS: A LOW TEMPERATURE THERMAL DETECTION TECHNIQUE  

E-Print Network (OSTI)

A. B. Optical System Absorption Signal C. Small SignalNoise . Sensitivity of Absorption Spectroscopy EXPERIMENTSINFRARED ABSORPTION SPECTROSCOPY OF CARBON MONOXIDE ON

Bailey, Robert Brian

2011-01-01T23:59:59.000Z

390

E-Print Network 3.0 - absorption line indices Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

for: absorption line indices Page: << < 1 2 3 4 5 > >> 1 Interstellar Absorption Lines and the Halo Summary: Interstellar Absorption Lines and the Halo History Discoveries...

391

DEVELOPMENT OF A NOVEL FINE COAL CLEANING SYSTEM  

SciTech Connect

The goal of the proposed project was to develop a novel fine coal separator having the ability to clean 1 mm x 0 size coal in a single processing unit. The novel fine coal separator, named as EG(Enhanced Gravity) Float Cell, utilizes a centrifugal field to clean 1 mm x 250 micron size coal, whereas a flotation environment to clean minus 250 micron coal size fraction. Unlike a conventional enhanced gravity concentrator, which rotates to produce a centrifugal field requiring more energy, the EG Float Cell is fed with a tangential feed slurry to generate an enhanced gravity field without any rotating part. A prototype EG Float Cell unit having a maximum diameter of 60 cm (24 inch) was fabricated during the first-half of the project period followed by a series of exploratory tests to make suitable design modification. Test data indicated that there was a significant concentration of coarse heavy materials in the coarse tailings discharge of the EG Float Cell. The increase in weight (%) of 1 mm x 250 micron (16 x 60 mesh) size fraction from 48.9% in the feed to 72.2% in the coarse tailings discharge and the corresponding increase in the ash content from 56.9% to 87.0% is indicative of the effectiveness of the enhanced gravity section of the EG Float Cell. However, the performance of the flotation section needs to be improved. Some of the possible design modifications may include more effective air sparging system for the flotation section to produce finer bubbles and a better wash water distributor.

Manoj K. Mohanty

2005-06-01T23:59:59.000Z

392

Lignin as Both Fuel and Fusing Binder in Briquetted Anthracite Fines for Foundry Coke Substitute.  

E-Print Network (OSTI)

??Lignin that had been extracted from Kraft black liquor was investigated as a fusing binder in briquetted anthracite fines for a foundry coke substitute. Cupola (more)

Lumadue, Matthew

2012-01-01T23:59:59.000Z

393

E-Print Network 3.0 - ambient fine particulate Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

about Clean Transportation projects at the North Carolina Solar Center Summary: or maintenance areas for national ambient air quality standards (NAAQS) for ozone andor fine...

394

POC-SCALE TESTING OF OIL AGGLOMERATION TECHNIQUES AND EQUIPMENT FOR FINE COAL PROCESSING  

SciTech Connect

This report covers the technical progress achieved from July 01, 1997 to September 30, 1997 on the POC-Scale Testing Agglomeration Techniques and Equipment for Fine Coal Processing project. Experimental procedures and test data for recovery of fine coal from coal fines streams generated at a commercial coal preparation plant are described. Two coal fines streams, namely Sieve Bend Effluent and Cyclone Overflow were investigated. The test results showed that ash was reduced by more than 50% at combustible matter recovery levels exceeding 95%.

NONE

1998-01-01T23:59:59.000Z

395

Development Of Reclamation Substrates For Alberta Oil Sands Using Mature Fine Tailings And Coke.  

E-Print Network (OSTI)

??Mature fine tailings and coke are waste products of the oil sands industry with potential for reclamation. A greenhouse study assessed whether substrates of various (more)

Luna-Wolter, Gabriela L.

2012-01-01T23:59:59.000Z

396

Triple effect absorption chiller utilizing two refrigeration circuits  

SciTech Connect

A heat absorption method for an absorption chiller is described comprising: (a) providing a first absorption system circuit for operation within a first temperature range; (b) providing a second absorption system circuit for operation within a second temperature range which has a lower maximum temperature than the first temperature range; (c) heat exchanging refrigerant and absorber solution from the first circuit condenser and absorber with absorption solution from the generator of the second circuit; and (d) the evaporator of the first circuit and the evaporator of the second circuit both being disposed in thermal communication with an external heat load to withdraw heat from the heat load.

De Vault, R.C.

1988-03-22T23:59:59.000Z

397

Subsidiary-absorption spin-wave-instability processes in yttrium iron garnet thin films: Coupled lateral standing modes, critical modes, and the kink effect  

Science Journals Connector (OSTI)

Subsidiary-absorption butterfly curves of the spin-wave-instability threshold microwave-field-amplitude versus static field H, for an in-plane magnetized 1.1 mm 2.0 mm, 7-?m-thick yttrium iron garnet film rectangle at 9.4 GHz, and with the linearly polarized microwave field perpendicular to the static field H and also in-plane, are found to show significant changes when H is changed from along the long edge to along the short edge of the rectangle. This effect is explained by a theory for the first-order spin-wave-instability threshold in magnetic films, which takes into acocunt the coupled standing spin-wave modes across the lateral dimensions of the film. This theory is a modification of a previous theory, which considered the standing modes across the film cross section only. The theory is able to reproduce the orientation effect found experimentally and give good fits to the butterfly-curve data. In contrast with previous results, it is not necessary to introduce ad hoc spin-wave angle ?K terms into the spin-wave linewidth to obtain these fits. The theory also yields critical-mode wave numbers in the kink region which are in the 5104 cm-1 range, which agree with previous fine-structure and Brillouin light-scattering measurements. A key parameter in the analysis is a mode spacing parameter ??K, which contains a factor of the form sin(2?K)/K, where K is the mode wave number and ?K is the mode in-plane angle relative to H. These dependences are the key to the match with experiment. They are also general, and not limited to the thin-film geometry.

G. Wiese; P. Kabos; C. E. Patton

1995-06-01T23:59:59.000Z

398

Thermal model of solar absorption HVAC systems  

SciTech Connect

This paper presents a thermal model that describes the performance of solar absorption HVAC systems. The model considers the collector array, the building cooling and heating loads, the absorption chiller and the high temperature storage. Heat losses from the storage tank and piping are included in the model. All of the results presented in the paper are for an array of flat plate solar collectors with black chrome (selective surface) absorber plates. The collector efficiency equation is used to calculate the useful heat output from the array. The storage is modeled as a non-stratified tank with polyurethane foam insulation. The system is assumed to operate continuously providing air conditioning during the cooling season, space heating during the winter and hot water throughout the year. The amount of heat required to drive the chiller is determined from the coefficient of performance of the absorption cycle. Results are presented for a typical COP of 0.7. The cooling capacity of the chiller is a function of storage (generator) temperature. The nominal value is 190 F (88 C) and the range of values considered is 180 F (82 C) to 210 F (99 C). Typical building cooling and heating loads are determined as a function of ambient conditions. Performance results are presented for Sacramento, CA and Washington, D.C. The model described in the paper makes use of National Solar Radiation Data Base (NSRDB) data and results are presented for these two locations. The uncertainties in the NSRDB are estimated to be in a range of 6% to 9%. This is a significant improvement over previously available data. The model makes it possible to predict the performance of solar HVAC systems and calculate quantities such as solar fraction, storage temperature, heat losses and parasitic power for every hour of the period for which data are available.

Bergquam, J.B.; Brezner, J.M. [California State Univ., Sacramento, CA (United States). Dept. of Mechanical Engineering; [Bergquam Energy Systems, Sacramento, CA (United States)

1995-11-01T23:59:59.000Z

399

Sound Absorption in the Pacific Ocean  

Science Journals Connector (OSTI)

The absorption of sound in the Pacific Ocean at a nominal frequency of 75 kHz was measured over a horizontal path at depths of 910 and 3350 m. The results are 20.01.5 dB/km and 13.51.5 dB/km respectively which may be compared to values of 27.3 dB/km and 22.7 dB/km extrapolated from the empirical relation of Schulkin and Marsh. Evidently the useful range of this relation is severely limited. In addition the effect of pressure may be greater than previously suspected.

H. F. Bezdek

1972-01-01T23:59:59.000Z

400

Absorption of the $?$ and $?$ Mesons in Nuclei  

E-Print Network (OSTI)

Due to their long lifetimes, the $\\omega$ and $\\phi$ mesons are the ideal candidates for the study of possible modifications of the in-medium meson-nucleon interaction through their absorption inside the nucleus. During the E01-112 experiment at the Thomas Jefferson National Accelerator Facility, the mesons were photoproduced from $^{2}$H, C, Ti, Fe, and Pb targets. This paper reports the first measurement of the ratio of nuclear transparencies for the $e^{+}e^{-}$ channel. The ratios indicate larger in-medium widths compared with what have been reported in other reaction channels.

M. H. Wood; R. Nasseripour; M. Paolone; C. Djalali; D. P. Weygand; the CLAS Collaboration

2010-06-17T23:59:59.000Z

Note: This page contains sample records for the topic "absorption fine structure" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

Distributed Bragg Reflectors With Reduced Optical Absorption  

DOE Patents (OSTI)

A new class of distributed Bragg reflectors has been developed. These distributed Bragg reflectors comprise interlayers positioned between sets of high-index and low-index quarter-wave plates. The presence of these interlayers is to reduce photon absorption resulting from spatially indirect photon-assisted electronic transitions between the high-index and low-index quarter wave plates. The distributed Bragg reflectors have applications for use in vertical-cavity surface-emitting lasers for use at 1.55 .mu.m and at other wavelengths of interest.

Klem, John F. (Albuquerque, NM)

2005-08-16T23:59:59.000Z

402

Far-Infrared Absorptivity of Metals  

Science Journals Connector (OSTI)

A simple calculation of the far-infrared absorptivity of a strong-coupling metal in the normal state is presented which is valid in the anomalous-skin-effect (ASE) region. The form of the results is compared with that derived by an alternate procedure in a recent letter by the author. A discussion of electron-phonon renormalization effects in the ASE limit is then considered and, in particular, at frequencies below threshold (???D), an effective mass mP** is introduced which incorporates these effects.

H. Scher

1971-05-15T23:59:59.000Z

403

Atomic Resolution Mapping of the Excited-State Electronic Structure...  

NLE Websites -- All DOE Office Websites (Extended Search)

Mapping of the Excited-State Electronic Structure of Cu2O with Time-Resolved X-Ray Absorption Spectroscopy. Atomic Resolution Mapping of the Excited-State Electronic Structure of...

404

Synthesis of zinc oxide particles coated multiwalled carbon nanotubes: Dielectric properties, electromagnetic interference shielding and microwave absorption  

SciTech Connect

Graphical abstract: A resistorcapacitor model could well describe the relationships between the structure and the dielectric properties, electromagnetic interference shielding and microwave-absorption of the composites in the frequency range of 218 GHz. The resonant behavior associated with the multiwalled carbon nanotubes/zinc oxide (MWCNTs/ZnO) interface greatly broadens the absorption band. Highlights: ? ZnO-immobilized on multiwalled carbon nanotubes (MWCNTs/ZnO) have resonant behavior. ? A resistorcapacitor model describes the relation between the structure and properties. ? The composite with 40 wt% MWCNTs/ZnO has good electromagnetic interference shielding. ? Two different types of absorption peaks are found in the MWCNTs/ZnO composites. ? The existence of MWCNTs/ZnO interface broadens the absorption band. -- Abstract: Zinc oxide (ZnO) nanoparticles were coated on the surfaces of multiwalled carbon nanotubes (MWCNTs). High resolution transmission electron microscopy images show that the wurtzite ZnO immobilized on the MWCNTs is single-crystalline with a preferential [0 0 0 2] growth direction. A capacitor was generated by the interface of ZnO and MWCNTs, and a resistorcapacitor model could well describe the relationships between the structure and the dielectric properties, electromagnetic interference shielding and microwave-absorption of the composites in the frequency range of 218 GHz. The network built by ZnO-immobilized MWCNTs could contribute to the improvement of electrical properties. Resonant peaks associated with the capacitor formed by the interface were observed in the microwave absorption spectra, which suggest that reflectionloss peaks greatly broadens the absorption bandwidth.

Song, Wei-Li [School of Material Science and Engineering, Beijing Institute of Technology, Beijing 100081 (China)] [School of Material Science and Engineering, Beijing Institute of Technology, Beijing 100081 (China); Cao, Mao-Sheng, E-mail: caomaosheng@bit.edu.cn [School of Material Science and Engineering, Beijing Institute of Technology, Beijing 100081 (China)] [School of Material Science and Engineering, Beijing Institute of Technology, Beijing 100081 (China); Wen, Bo; Hou, Zhi-Ling; Cheng, Jin [School of Material Science and Engineering, Beijing Institute of Technology, Beijing 100081 (China)] [School of Material Science and Engineering, Beijing Institute of Technology, Beijing 100081 (China); Yuan, Jie, E-mail: yuanjie4000@sina.com [School of Information Engineering, Central University for Nationality, Beijing 100081 (China)] [School of Information Engineering, Central University for Nationality, Beijing 100081 (China)

2012-07-15T23:59:59.000Z

405

Residential solar-absorption chiller thermal dynamics  

SciTech Connect

Research is reported on the transient performance of a commercial residential 3 ton lithium bromide-water absorption chiller designed for solar firing. Emphasis was placed on separating the chiller response from that of the entire test facility so that its transient response could solely be observed and quantified. It was found that the entire system time response and thermal capacitance has a major impact on performance degradation due to transient operation. Tests run to ascertain computer algorithms which simulate system isolated chiller performance, revealed processes hitherto undocumented. Transient operation is simulated by three distinct algorithms associated with the three phases of chiller operation. The first phase is start up time. It was revealed during testing that the time required to reach steady state performance values, when the chiller was turned on, was a linear function of steady state water supply temperatures. The second phase is quasi steady state performance. Test facility's performance compared favorably with the manufacturer's published data. The third phase is the extra capacity produced during spin down. Spin down occurs when the hot water supply pump is turned off while the other system pumps remain operating for a few minutes, thus allowing extra chiller capacity to be realized. The computer algorithms were used to generate plots which show the operational surface of an isolated absorption chiller subjected to off design and transient operation.

Guertin, J.M.; Wood, B.D.; McNeill, B.W.

1981-03-01T23:59:59.000Z

406

Hydroxide absorption heat pumps with spray absorber  

SciTech Connect

The absorber is one of the most expensive components of an absorption heat pump or chiller, respectively. In order to reduce the cost of a heat exchanger, much effort is invested into searching for additives for heat transfer enhancement. Another way to reduce heat exchanger cost, especially for machines with low capacities, is to use an adiabatic spray absorber. The basic principles of the spray absorber is to perform heat and mass transfer separated from each other in two different components. In this way the heat can be rejected effectively in a liquid-liquid heat exchanger, whereas the mass transfer occurs subsequently in a simple vessel. The spray technique can not only save heat exchanger cost in conventional absorption systems working with water and lithium bromide, it also allows the use of quite different working fluids such as hydroxides, which have lower heat transfer coefficients in falling films. Moreover, the separated heat transfer can easily be performed in a liquid-to-air heat exchanger. Hence it is obvious to use hydroxides that allow for a high temperature lift for building an air-cooled chiller with spray absorber. In this presentation theoretical and experimental investigations of the spray absorber as well as the setup will be described. Finally, possible applications will be outlined.

Summerer, F.; Alefeld, G. [Technische Univ. Muenchen, Munich (Germany). Physics Dept.; Zeigler, F.; Riesch, P. [Bayerisches Zentrum fuer Angewandte Energieforschung, Munich (Germany)

1996-11-01T23:59:59.000Z

407

Experimental study of neutrino absorption on carbon  

Science Journals Connector (OSTI)

The process of electron emission from ?30 MeV neutrino absorption on carbon, C12(?e,e-)12N, has been observed. The flux-weighted total cross section for the exclusive neutrino-induced nuclear transition C12(?e,e-)12N(g.s.) is [1.050.10(stat)0.10(syst)]10-41 cm2. The measured cross section and angular distribution d?/d? are in agreement with theoretical estimates. The inclusive ?e C12 reaction rate, which accounted for the majority of all neutrino interactions observed in this experiment, was determined from a detailed fit of energy and angular distributions for the observed electrons. The inclusive C12(?e,e-)X cross section is measured to be [1.410.23(tot)]10-41 cm2. An upper limit for the sum of the C13(?e,e-)X+27Al(?e,e-)X inclusive absorption cross sections is presented.

D. A. Krakauer; R. L. Talaga; R. C. Allen; H. H. Chen; R. Hausammann; W. P. Lee; H. J. Mahler; X. Q. Lu; K. C. Wang; T. J. Bowles; R. L. Burman; R. D. Carlini; D. R. F. Cochran; P. J. Doe; J. S. Frank; E. Piasetzky; M. E. Potter; V. D. Sandberg

1992-05-01T23:59:59.000Z

408

Time-Resolved Structural Characterization of Formation and Break-up of Rhodium Clusters Supported in Highly Dealuminated Y Zeolite  

SciTech Connect

Mononuclear rhodium complexes incorporating two ethylene ligands and anchored to dealuminated zeolite Y by two Rh-O bonds were characterized by transient extended X-ray absorption fine structure (EXAFS) spectroscopy and infrared (IR) spectroscopy as they were converted in the presence of H{sub 2}. EXAFS spectra indicate reduction of the rhodium in the complex at 298 K to form rhodium clusters less than 3 {angstrom} in average diameter. Contacting of the resultant clusters with C{sub 2}H{sub 4} led to their oxidative fragmentation, and the process was reversible. When the H{sub 2} treatment was carried out at a higher temperature (373 K), larger clusters formed. The reduction and oxidation of the rhodium were confirmed by X-ray absorption near edge spectra. During the ethylene treatments, ethyl groups formed on the rhodium, as indicated by IR spectra; treatment in H{sub 2} led to hydrogenation of these groups to form ethane, and the ethyl groups are inferred to be intermediates in the catalytic hydrogenation of ethylene. Ethylene in the gas phase helps to stabilize rhodium in the form of mononuclear complexes on the zeolite during catalysis, hindering the cluster formation.

Liang, Ann J.; Gates, Bruce C. (UCD)

2009-06-12T23:59:59.000Z

409

E-Print Network 3.0 - absorption spectroscopy measurements Sample...  

NLE Websites -- All DOE Office Websites (Extended Search)

A partial sampling of these techniques includes: Absorption spectroscopy Atomic absorption... spectroscopy Auger electron ... Source: Yucca Mountain Project, US...

410

E-Print Network 3.0 - absorption spectrometry etaas Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

With Confirmation of Accuracy by Inductively Coupled Plasma Mass Spectrometry and Atomic Absorption Spectrometry... -LEAFS uses absorption; graphite furnace; inductively...

411

Magnetic cellulose-derivative structures  

DOE Patents (OSTI)

Structures to serve as selective magnetic sorbents are formed by dissolving a cellulose derivative such as cellulose triacetate in a solvent containing magnetic particles. The resulting solution is sprayed as a fine mist into a chamber containing a liquid coagulant such as n-hexane in which the cellulose derivative is insoluble but in which the coagulant is soluble or miscible. On contact with the coagulant, the mist forms free-flowing porous magnetic microspheric structures. These structures act as containers for the ion-selective or organic-selective sorption agent of choice. Some sorption agents can be incorporated during the manufacture of the structure. 3 figs.

Walsh, M.A.; Morris, R.S.

1986-09-16T23:59:59.000Z

412

Magnetic cellulose-derivative structures  

DOE Patents (OSTI)

Structures to serve as selective magnetic sorbents are formed by dissolving a cellulose derivative such as cellulose triacetate in a solvent containing magnetic particles. The resulting solution is sprayed as a fine mist into a chamber containing a liquid coagulant such as n-hexane in which the cellulose derivative is insoluble but in which the coagulant is soluble or miscible. On contact with the coagulant, the mist forms free-flowing porous magnetic microspheric structures. These structures act as containers for the ion-selective or organic-selective sorption agent of choice. Some sorbtion agents can be incorporated during the manufacture of the structure.

Walsh, Myles A. (Falmouth, MA); Morris, Robert S. (Fairhaven, MA)

1986-09-16T23:59:59.000Z

413

Elimination of self-absorption in fluorescence hard-x-ray absorption spectra P. Pfalzer, J.-P. Urbach, M. Klemm, and S. Horn  

E-Print Network (OSTI)

Elimination of self-absorption in fluorescence hard-x-ray absorption spectra P. Pfalzer, J-ray absorption spectra in situations where samples cannot be made in the required configuration. However, self-absorption-ray absorption coefficients. This procedure is used to obtain the vanadium K-edge spectrum of single crystal V2O3

Frenkel, Anatoly

414

Intrinsic nature of visible-light absorption in amorphous semiconducting oxides  

SciTech Connect

To enlighten microscopic origin of visible-light absorption in transparent amorphous semiconducting oxides, the intrinsic optical property of amorphous InGaZnO{sub 4} is investigated by considering dipole transitions within the quasiparticle band structure. In comparison with the crystalline InGaZnO{sub 4} with the optical gap of 3.6 eV, the amorphous InGaZnO{sub 4} has two distinct features developed in the band structure that contribute to significant visible-light absorption. First, the conduction bands are down-shifted by 0.55 eV mainly due to the undercoordinated In atoms, reducing the optical gap between extended states to 2.8 eV. Second, tail states formed by localized oxygen p orbitals are distributed over ?0.5 eV near the valence edge, which give rise to substantial subgap absorption. The fundamental understanding on the optical property of amorphous semiconducting oxides based on underlying electronic structure will pave the way for resolving instability issues in recent display devices incorporating the semiconducting oxides.

Kang, Youngho; Song, Hochul; Han, Seungwu, E-mail: hansw@snu.ac.kr [Department of Materials Science and Engineering, Seoul National University, Seoul 151-755 (Korea, Republic of); Nahm, Ho-Hyun [Center for Correlated Electron Systems, Institute for Basic Science (IBS), Seoul 151-747 (Korea, Republic of); Department of Physics and Astronomy, Seoul National University, Seoul 151-747 (Korea, Republic of); Jeon, Sang Ho; Cho, Youngmi [CAE Team, Samsung Display Co., Ltd, 95 Samsung 2-ro, Giheung-gu, Youngin-City, Gyeonggi-Do 446-711 (Korea, Republic of)

2014-03-01T23:59:59.000Z

415

Loss of Fine Particle Ammonium from Denuded Nylon Filters  

SciTech Connect

Ammonium is an important constituent of fine particulate mass in the atmosphere, but can be difficult to quantify due to possible sampling artifacts. Losses of semivolatile species such as NH4NO3 can be particularly problematic. In order to evaluate ammonium losses from aerosol particles collected on filters, a series of field experiments was conducted using denuded nylon and Teflon filters at Bondville, Illinois (February 2003), San Gorgonio, California (April 2003 and July 2004), Grand Canyon National Park, Arizona (May, 2003), Brigantine, New Jersey (November 2003), and Great Smoky Mountains National Park (NP), Tennessee (JulyAugust 2004). Samples were collected over 24-hr periods. Losses from denuded nylon filters ranged from 10% (monthly average) in Bondville, Illinois to 28% in San Gorgonio, California in summer. Losses on individual sample days ranged from 1% to 65%. Losses tended to increase with increasing diurnal temperature and relative humidity changes and with the fraction of ambient total N(--III) (particulate NH4+ plus gaseous NH3) present as gaseous NH3. The amount of ammonium lost at most sites could be explained by the amount of NH4NO3 present in the sampled aerosol. Ammonium losses at Great Smoky Mountains NP, however, significantly exceeded the amount of NH4NO3 collected. Ammoniated organic salts are suggested as additional important contributors to observed ammonium loss at this location.

Yu, Xiao-Ying; Lee, Taehyoung; Ayres, Benjamin; Kreidenweis, Sonia M.; Malm, William C.; Collett, Jeffrey L.

2006-08-01T23:59:59.000Z

416

Pyroprocessing of fine industrial minerals in a suspension flash calciner  

Science Journals Connector (OSTI)

ABSTRACT Suspension flash calcining is well suited for heat treatment of -20 mesh and finer materials at temperatures up to 1400C. The system has been applied to a number of materials including limestone, dolomite, phosphate and gypsum, which are discussed in this paper. The system operates in a countercurrent mode, incorporating one to three suspension cyclone preheat stages ahead of a suspension flash calciner; followed by one to three suspension cyclone cooling stages. Operating temperatures range from 11001200C for limestone and dolomite, to 800900C for phosphate and 150300C for gypsum. Fuel is normally fired directly into the suspension flash calciner vessel, or as in the case of gypsum in a separately fired air heater. Flash calcination offers a unique approach to the processing of fine materials. The short residence time of the flash calciner system works to prevent overburning, however the excellent heat transfer that is achieved allows the calcination load to be accomplished. KEYWORDS - Suspension, Calcining, Calcination, Limestone, Dolomite, Gypsum, Phosphate

W.E. Lindquist; S.M. Cohen; B.T. Field

1988-01-01T23:59:59.000Z

417

Pseudospherical Junctions or Josephson Effect, Backlund Transformations, and Fine Structure Coupling  

E-Print Network (OSTI)

, that the geometric phase evolution within M circularly and toroidally arranged virtual Josephson junctions (coupled by a special arrangement of Josephson junctions. In this con- text "virtual junction" means simply a scalar impedance will represent in this paper a "virtual Josephson junction". The Josephson junctions

Binder, Bernd

418

Non-linear electrodynamics and the variation of the fine structure constant  

Science Journals Connector (OSTI)

......modification of the standard model of electroweak...109 yr ago in Oklo Uranium Mine in Gabon...also see the recent review by Garcia-Berro...communication, we plan to address each...propagates along standard null geodesics...distance computed in a standard fashion in the context......

Jean Paul Mbelek; Herman J. Mosquera Cuesta

2008-09-01T23:59:59.000Z

419

Effect of anatomical fine structure on the flow of cerebrospinal fluid in the spinal subarachnoid space.  

SciTech Connect

The lattice Boltzmann method is used to model oscillatory flow in the spinal subarachnoid space. The effect of obstacles such as trabeculae, nerve bundles, and ligaments on fluid velocity profiles appears to be small, when the flow is averaged over the length of a vertebra. Averaged fluid flow in complex models is little different from flow in corresponding elliptical annular cavities. However, the obstacles stir the flow locally and may be more significant in studies of tracer dispersion.

Stockman, Harlan Wheelock

2005-01-01T23:59:59.000Z

420

Fine Structure of the Radial Breathing Mode in Double-Wall Carbon Nanotubes  

E-Print Network (OSTI)

The analysis of the Raman scattering cross section of the radial breathing modes of double-wall carbon nanotubes allowed to determine the optical transitions of the inner tubes. The Raman lines are found to cluster into species with similar resonance behavior. The lowest components of the clusters correspond well to SDS wrapped HiPco tubes. Each cluster represents one particular inner tube inside different outer tubes and each member of the clusters represents one well defined pair of inner and outer tubes. The number of components in one cluster increases with decreasing of the inner tube diameter and can be as high as 14.

R. Pfeiffer; F. Simon; H. Kuzmany; V. N. Popov

2005-08-09T23:59:59.000Z

Note: This page contains sample records for the topic "absorption fine structure" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

P nucleotides in V(D)J recombination: a fine-structure analysis.  

Science Journals Connector (OSTI)

...NUCLEOTIDES IN V(D)J RECOMBINATION 1085 related to coding joints (23) and can...the legend to Fig. 3. VOL. 13, 1993 1086 MEIER AND LEWIS the crossover site. The...NUCLEOTIDES IN V(D)J RECOMBINATION 1089 surface receptor-positive cells, either...

J T Meier; S M Lewis

1993-02-01T23:59:59.000Z

422

The unresolved fine structure resolved: IRIS observations of the solar transition region  

Science Journals Connector (OSTI)

...spectra, with models of the energy and mass exchange between the cooler...coronal 171 a (blue) and 193 a (green) filters (movie S3 shows the same field...Whereas long loops lose energy through thermal conduction...and the Fe XII 193 a filter in green. Movie S4 UFS as seen in 'realistic...

V. Hansteen; B. De Pontieu; M. Carlsson; J. Lemen; A. Title; P. Boerner; N. Hurlburt; T. D. Tarbell; J. P. Wuelser; T. M. D. Pereira; E. E. De Luca; L. Golub; S. McKillop; K. Reeves; S. Saar; P. Testa; H. Tian; C. Kankelborg; S. Jaeggli; L. Kleint; J. Martnez-Sykora

2014-10-17T23:59:59.000Z

423

Cartilage mechanobiology : the effects of loading on the fine structure and function of chondroitin sulfate glycosaminoglycans  

E-Print Network (OSTI)

Chondroitin sulfate is a critical component of articular cartilage due to its contribution to the tissue's resistance to compressive deformation. Alterations in the biosynthesis of this molecule over time could impact the ...

Szafranski, Jon D. (Jon David)

2005-01-01T23:59:59.000Z

424

Analysis of fine ELF wave structures observed poleward from the ionospheric trough  

E-Print Network (OSTI)

for the electric field was from DC up to 3.5 MHz and for the magnetic field from a few hertz up to 20 kHz. The emissions are detected in the ELF range (200 Hz to 3 kHz) in the upper ionosphere during geomagnetic up to 20 kHz with a frequency resolution of 19.53 Hz and a time PARROT ET AL. ©2014. American

Santolik, Ondrej

425

The fine structure of honeybee head and body yaw movements in a homing task  

Science Journals Connector (OSTI)

...regularly were individually marked with acrylic paint on thorax and abdomen. These bees were then trained...and W. Sturzl 2009 Visual homing in insects and robots. In Flying insects and robots (eds D. Floreano, ), pp. 87-100. New York...

2010-01-01T23:59:59.000Z

426

Fine structure of the chromophobe in the pars distalis of the common snapping turtle, Chelydra serpentina  

Science Journals Connector (OSTI)

Chromophobes of the pars distalis in young Chelydra serpentina have sparse cytoplasm with no specific granules; however, many cytoplasmic filaments are present. The chromophobes are connected to the other cell ty...

Dr. Michael T. Tseng; Chester L. Yntema

1976-02-01T23:59:59.000Z

427

E-Print Network 3.0 - alpha fine structure Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

were unable to improve upon the image fits; relaxing the re... (Alpha) is an unconsolidated gravitational aggregate with a spin period 2.8 hours, bulk density 2 grams... is...

428

Variation of the fine-structure constant in QSO spectra from coherent dark matter oscillations  

Science Journals Connector (OSTI)

......solvable for other functions Q() (Dick 1999; Chabab, Markazi Saidi 2000; Slusarczyk Wereszczynski 2001, 2003), and with mass...Phys. Rev. D, 66, 123514. Chabab M. , Markazi R., Saidi E. H.,2000, Eur. Phys. J. C, 13, 543. Copeland E......

M. G. Barnett; R. Dick; K. E. Wunderle

2004-04-21T23:59:59.000Z

429

Periodicity extraction in the anuran auditory nerve. II: Phase and temporal fine structure  

Science Journals Connector (OSTI)

Discharge patterns of single eighth nerve fibers in the bullfrog Rana catesbeiana were analyzed in response to signals consisting of multiple harmonics of a common low?amplitude fundamental frequency. The signals were chosen to reflect the frequency and amplitude spectrum of the bullfrogs species?specific advertisement call. The phase spectrum of the signals was manipulated to produce envelopes that varied in their shapes from impulselike (sharp) to noiselike (flattened). Peripheral responses to these signals were analyzed by computing the autocorrelation functions of the spike trains and their power spectra as well as by constructing period histograms over the time intervals of the low?frequency harmonics. In response to a phase aligned signal with an impulsive envelope most fibers regardless of their characteristic frequencies or place of origin within the inner ear synchronize to the fundamental frequency of the signal. The temporal patterns of fiber discharge to these stimuli are not typically captured by that stimulus harmonic closest to the fiber characteristic frequency as would be expected from a spectral coding mechanism for periodicity extraction but instead directly reflect the periodicity of the stimulus envelope.

Andrea Megela Simmons; Gita Reese; Michael Ferragamo

1993-01-01T23:59:59.000Z

430

The Infra-Red Absorption of Brucite and Some Sulphates; Isotopic Effect  

Science Journals Connector (OSTI)

By means of an infra-red spectrometer the structure of the absorption band of brucite [Mg(OH)2] was studied. The region of greatest absorption was found to be at 2.48?. Besides this maximum there were small maxima of absorption located at 2.40?, 2.30?, 2.14?. The maxima at 2.48?, 240?, and 2.30? correspond approximately in position and absorption to the isotopes of Mg24, Mg25, and Mg26 as found by Aston. The small band at 2.14?, corresponds in position to Mg28. However, this isotope is not given. The work of Coblentz has been examined for the isotopic effect. In the reflection spectrum of nickel sulphate in solution there are two maxima located at 9.15? and 9.50?. The second is more intense. These maxima are probably due to Ni58 and Ni60. In the spectrum of potassium sulphate there are two maxima, one at 9.00? and the other at 9.40?. The maxima at 9.40? is much more intense. These two maxima are probably due to K39+41 and KR39 taken twice. Other sulphates in solution showed only one maximum. The sulphates of barium, strontium, and magnesium in the solid state also had complex maxima. As the light was unpolarized, these maxima might be due to pleochroism.

E. K. Plyler

1926-08-01T23:59:59.000Z

431

Ab initio calculation of the electronic absorption spectrum of liquid water  

SciTech Connect

The electronic absorption spectrum of liquid water was investigated by coupling a one-body energy decomposition scheme to configurations generated by classical and Born-Oppenheimer Molecular Dynamics (BOMD). A Frenkel exciton Hamiltonian formalism was adopted and the excitation energies in the liquid phase were calculated with the equation of motion coupled cluster with single and double excitations method. Molecular dynamics configurations were generated by different approaches. Classical MD were carried out with the TIP4P-Ew and AMOEBA force fields. The BLYP and BLYP-D3 exchange-correlation functionals were used in BOMD. Theoretical and experimental results for the electronic absorption spectrum of liquid water are in good agreement. Emphasis is placed on the relationship between the structure of liquid water predicted by the different models and the electronic absorption spectrum. The theoretical gas to liquid phase blue-shift of the peak positions of the electronic absorption spectrum is in good agreement with experiment. The overall shift is determined by a competition between the OH stretching of the water monomer in liquid water that leads to a red-shift and polarization effects that induce a blue-shift. The results illustrate the importance of coupling many-body energy decomposition schemes to molecular dynamics configurations to carry out ab initio calculations of the electronic properties in liquid phase.

Martiniano, Hugo F. M. C.; Galamba, Nuno [Grupo de Fsica Matemtica da Universidade de Lisboa, Av. Professor Gama Pinto 2, 1649-003 Lisboa (Portugal)] [Grupo de Fsica Matemtica da Universidade de Lisboa, Av. Professor Gama Pinto 2, 1649-003 Lisboa (Portugal); Cabral, Benedito J. Costa, E-mail: ben@cii.fc.ul.pt [Grupo de Fsica Matemtica da Universidade de Lisboa, Av. Professor Gama Pinto 2, 1649-003 Lisboa (Portugal) [Grupo de Fsica Matemtica da Universidade de Lisboa, Av. Professor Gama Pinto 2, 1649-003 Lisboa (Portugal); Departamento de Qumica e Bioqumica, Faculdade de Cincias, Universidade de Lisboa, 1749-016 Lisboa (Portugal); Instituto de Fsica da Universidade de So Paulo, CP 66318, 05314-970 So Paulo, SP (Brazil)

2014-04-28T23:59:59.000Z

432

Lensing of 21cm Absorption "Halos" of $z\\sim$20-30 First Galaxies  

E-Print Network (OSTI)

Extended 21cm absorption regions (dubbed ``21cm absorption halos'') around first galaxies at $z\\sim 30$ are likely the first distinctive structures accessible to radio observations. Though the radio array capable of detecting and resolving them must have $\\sim 200$ km$^2$ total collecting area, given the great impact of such detections to the understanding of the reionization process and cosmology, such radio survey would be extremely profitable. As an example, we point out a potentially useful byproduct of such survey. The resolved 21cm absorption ``halos'', likely close to spherical, can serve as (almost) ideal sources for measuring the {\\it cosmic shear} and mapping the matter distribution to $z\\sim 30$. We investigate the expected lensing signal and consider a variety of noise contributions on the shear measurement. We find that S/N $\\sim 1$ can be achieved for individual ``halos''. Given millions of 21cm absorption ``halos'' across the sky, the total S/N will be comparable to traditional shear measurement of $\\sim$$10^9$ galaxies at $z\\sim 1$.

Pengjie Zhang; Zheng Zheng; Renyue Cen

2006-08-13T23:59:59.000Z

433

Performance bound for quantum absorption refrigerators  

E-Print Network (OSTI)

An implementation of quantum absorption chillers with three qubits has been recently proposed, that is ideally able to reach the Carnot performance regime. Here we study the working efficiency of such self-contained refrigerators, adopting a consistent treatment of dissipation effects. We demonstrate that the coefficient of performance at maximum cooling power is upper bounded by 3/4 of the Carnot performance. The result is independent of the details of the system and the equilibrium temperatures of the external baths. We provide design prescriptions that saturate the bound in the limit of a large difference between the operating temperatures. Our study suggests that delocalized dissipation, which must be taken into account for a proper modelling of the machine-baths interaction, is a fundamental source of irreversibility which prevents the refrigerator from approaching the Carnot performance arbitrarily closely in practice. The potential role of quantum correlations in the operation of these machines is also investigated.

Luis A. Correa; Jos P. Palao; Gerardo Adesso; Daniel Alonso

2012-12-18T23:59:59.000Z

434

J/$?$ absorption in a multicomponent hadron gas  

E-Print Network (OSTI)

A model for anomalous $J/\\Psi$ suppression in high energy heavy ion collisions is presented. As the additional suppression mechanism beyond standard nuclear absorption inelastic $J/\\Psi$ scattering with hadronic matter is considered. Hadronic matter is modeled as an evolving multi-component gas of point-like non-interacting particles (MCHG). Estimates for the sound velocity of the MCHG are given and the equation of state is compared with Lattice QCD data in the vicinity of the deconfinement phase transition. The approximate cooling pattern caused by longitudinal expansion is presented. It is shown that under these conditions the resulting $J/\\Psi$ suppression pattern agrees well with NA38 and NA50 data.

Dariusz Prorok; Ludwik Turko; David Blaschke

2008-08-04T23:59:59.000Z

435

Carbon Dioxide Capture by Absorption with Potassium Carbonate  

NLE Websites -- All DOE Office Websites (Extended Search)

Carbon Dioxide Capture by Absorption Carbon Dioxide Capture by Absorption with Potassium Carbonate Background Although alkanolamine solvents, such as monoethanolamine (MEA), and solvent blends have been developed as commercially-viable options for the absorption of carbon dioxide (CO 2 ) from waste gases, natural gas, and hydrogen streams, further process improvements are required to cost-effectively capture CO 2 from power plant flue gas. The promotion of potassium carbonate (K

436

Electron absorption by complex potentials: One-dimensional case  

Science Journals Connector (OSTI)

We investigate the electronic absorption induced by a complex potential in one-dimensional quantum mechanics. By solving the Schrdinger equation for spatially localized and extended complex potentials, we derive the electronic absorption coefficient ?. Neither a single nor a double Dirac-? potential can represent a totally absorbing potential (?=1) for any choice of the complex amplitude of the potential. Maximum absorption coefficients for these potential types are 0.5 and 2(?2-1)?0.828, respectively. On the contrary, wall and well potentials do account for total absorption at a particular limit of the potential parameters. 1996 The American Physical Society.

Patrici Molins-Mata and Pau Molins-Mata

1996-09-01T23:59:59.000Z

437

The Future of Absorption Technology in America: A Critical Look...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

& Publications Guide to Developing Air-Cooled Lithium Bromide (LiBr) Absorption for CHP Applications, April 2005 Review of Thermally Activated Technologies, July 2004 Use...

438

Absorption Mode FT-ICR Mass Spectrometry Imaging. | EMSL  

NLE Websites -- All DOE Office Websites (Extended Search)

Imaging. Absorption Mode FT-ICR Mass Spectrometry Imaging. Abstract: Fourier transform ion cyclotron resonance mass spectrometry offers the highest mass resolving power...

439

Use Low-Grade Waste Steam to Power Absorption Chillers  

Energy.gov (U.S. Department of Energy (DOE))

This tip sheet on waste steam to power absorption chillers provides how-to advice for improving steam systems using low-cost, proven practices and technologies.

440

Advanced Exergy Analysis for a Solar Double Stage Absorption Chiller.  

E-Print Network (OSTI)

??Solar driven absorption chiller technology as an alternative mechanism for cooling has been the focus of tremendous recent interest due to its potential advantages for (more)

Hu, Yang

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "absorption fine structure" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

Design and simulation of solar absorption cooling systems.  

E-Print Network (OSTI)

??The absorption chiller modeling is then exploited in a computer tool that gives valuable information on the planning of solar cooling systems. The design of (more)

NURZIA, GIOVANNI

2008-01-01T23:59:59.000Z

442

Multipass absorption cell designed for high temperature UHV operation  

Science Journals Connector (OSTI)

This paper describes the design and performance of a tunable diode laser system, incorporating a multipass absorption cell to allow determination of water concentration below 10 ppb...

Schaeffer, Ronald D; Sproul, J C; OConnell, J; van Vloten, C; Mantz, Arlan W

1989-01-01T23:59:59.000Z

443

The Effect of Surface Heterogeneity on Cloud Absorption Estimates  

NLE Websites -- All DOE Office Websites (Extended Search)

Effect of Surface Heterogeneity on Cloud Absorption Estimates W. J. Wiscombe and A. Marshak National Aeronautics and Space Administration - Goddard Space Flight Center Climate and...

444

Solar absorption by Mie resonances in cloud droplets  

E-Print Network (OSTI)

and narrower. These sensors measure solar backscattered andsensor channels where atmospheric absorption is particle dominated. The canonical resolution produces broadband solar

Zender, Charles S; Talamantes, Jorge

2006-01-01T23:59:59.000Z

445

Optimizing Nanoparticle Designs to Reach Ideal Light Absorption  

E-Print Network (OSTI)

Ideal absorption describes a particular means of optimizing light-matter interactions with a host of potential applications. This work presents new analytic formulas and describes semi-analytical methods for the design of electric or magnetic ideal absorption in nanoparticles. These formulas indicate that ideal absorption is attainable in homogeneous spheres with known materials at specific sizes and frequencies. They also provide a means of designing core-shell particles to produce ideal absorption at virtually any frequency in the visible and near infrared range.

Grigoriev, Victor; Wenger, Jerome; Stout, Brian

2014-01-01T23:59:59.000Z

446

Polarization-enhanced absorption spectroscopy for laser stabilization  

Science Journals Connector (OSTI)

We demonstrate a variation of pump-probe spectroscopy that is particularly useful for laser frequency stabilization. The polarization-enhanced absorption spectroscopy (POLEAS) signal...

Kunz, Paul D; Heavner, Thomas P; Jefferts, Steven R

2013-01-01T23:59:59.000Z

447

Colored solar-thermal absorbing coatings with high absorptance  

Science Journals Connector (OSTI)

It's difficult to obtain different color appearance and keep high absorptance simultaneously. We introduced AR films into solar-thermal absorbing coatings to tune the color appearance...

Wang, Shao-Wei; Chen, Feiliang; Liu, Xingxing; Wang, Xiaofang; Yu, Liming; Lu, Wei

448

Hydrogen Absorption Induced Metal Deposition on Palladium and...  

NLE Websites -- All DOE Office Websites (Extended Search)

Hydrogen Absorption Induced Metal Deposition on Palladium and Palladium-Alloy Particles Brookhaven National Laboratory Contact BNL About This Technology

High resolution...

449

Diffraction: Enhanced Light Absorption of Solar Cells and Photodetecto...  

NLE Websites -- All DOE Office Websites (Extended Search)

Materials Advanced Materials Find More Like This Return to Search Diffraction: Enhanced Light Absorption of Solar Cells and Photodetectors Sandia National Laboratories Contact...

450

Infrared absorption of hydrogen-related defects in strontium titanate M. C. Tarun and M. D. McCluskeya)  

E-Print Network (OSTI)

in perovskite oxides, an important issue in fuel cells.16 In as- grown SrTiO3, isolated hydrogen forms a bondInfrared absorption of hydrogen-related defects in strontium titanate M. C. Tarun and M. D. Mc 2011) Hydrogen has a significant impact on the structural and electronic properties of metals

McCluskey, Matthew

451

Perfect light trapping in nanoscale thickness semiconductor films with resonant back reflector and spectrum-splitting structures  

E-Print Network (OSTI)

The optical absorption of nanoscale thickness semiconductor films on top of light-trapping structures based on optical interference effects combined with spectrum-splitting structures is theoretically investigated. Nearly perfect absorption over a broad spectrum range can be achieved in $solar absorption and low carrier thermalization loss can be achieved when the light-trapping structures with wedge-shaped spacer layer or semiconductor films are combined with spectrum-splitting structures.

Liu, Jiang-Tao; Yang, Wen; Li, Jun

2014-01-01T23:59:59.000Z

452

Vitrification testing of soil fines from contaminated Hanford 100 Area and 300 Area soils  

SciTech Connect

The suitability of Hanford soil for vitrification is well known and has been demonstrated extensively in other work. The tests reported here were carried out to confirm the applicability of vitrification to the soil fines (a subset of the Hanford soil potentially different in composition from the bulk soil) and to provide data on the performance of actual, vitrified soil fines. It was determined that the soil fines were generally similar in composition to the bulk Hanford soil, although the fraction <0.25 mm in the 100 Area soil sample appears to differ somewhat from the bulk soil composition. The soil fines are readily melted into a homogeneous glass with the simple additions of CaO and/or Na{sub 2}O. The vitrified waste (plus additives) occupies only 60% of the volume of the initial untreated waste. Leach testing has shown the glasses made from the soil fines to be very durable relative to natural and man-made glasses and has demonstrated the ability of the vitrified waste to greatly reduce the release of radionuclides to the environment. Viscosity and electrical conductivity measurements indicate that the soil fines will be readily processable, although with levels of additives slightly greater than used in the radioactive melts. These tests demonstrate the applicability of vitrification to the contaminated soil fines and the exceptional performance of the waste form resulting from the vitrification of contaminated Hanford soils.

Ludowise, J.D.

1994-05-01T23:59:59.000Z

453

The mineralogy and chemistry of fine-grained sediments, Morphou Bay, CyprusHydrology and Earth System Sciences, 6(5), 819831 (2002) EGS The mineralogy and chemistry of fine-grained sediments,  

E-Print Network (OSTI)

819 The mineralogy and chemistry of fine-grained sediments, Morphou Bay, CyprusHydrology and Earth System Sciences, 6(5), 819­831 (2002) © EGS The mineralogy and chemistry of fine-grained sediments of marine sediments at Morphou Bay, north-west Cyprus, are presented to characterise fine-grained sediment

Paris-Sud XI, Université de

454

E-Print Network 3.0 - atomic binding energy Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

energy Search Powered by Explorit Topic List Advanced Search Sample search results for: atomic binding energy Page: << < 1 2 3 4 5 > >> 1 Extended Xray Absorption Fine Structure...

455

Accurate Band-Structure Calculations for the 3d Transition Metal...  

NLE Websites -- All DOE Office Websites (Extended Search)

qualitatively improve the calculated bandgap energies (see table). * Using this method, electronic structure calculations with correct d-band energies and accurate absorption...

456

Morphological Characterization of Superfine Pulverized Coal Particles. 1. Fractal Characteristics and Economic Fineness  

Science Journals Connector (OSTI)

Finally, a new method for identifying the economic granule size of pulverized coal particles, that is, economic fineness based on the power consumption of coal mills, E2, was proposed by a utilizing neural network method. ... Therefore, we can draw the conclusion that the economic fineness of pulverized coal particles which is related to the coal quantity varies with different coals. ... Furthermore, a conclusion can be drawn that the economic fineness of pulverized coal particles related to the coal quantity varies with different coals. ...

Jiaxun Liu; Xiumin Jiang; Xiangyong Huang; Shaohua Wu

2009-11-10T23:59:59.000Z

457

Atomic structure of amorphous and crystallized Ge{sub 15}Sb{sub 85}  

SciTech Connect

Ge{sub 15}Sb{sub 85} is a promising material for phase-change memory applications owing to its very short crystallization times. As deposited amorphous samples of sputter deposited Ge{sub 15}Sb{sub 85} have been investigated by extended x-ray absorption fine structure (EXAFS) measurements on both, Sb and Ge K absorption edges. After crystallizing the specimen, x-ray diffraction (XRD) and EXAFS measurements have been performed to analyze the atomic structure at different annealing conditions. Thus, experimental techniques focusing on the long range order as well as on the local order have been combined. Sb atoms have on average 3.2(2) nearest neighbors, while Ge atoms have 4.0(3). The Ge-Ge and Ge-Sb bond lengths are determined to 2.46(2) and 2.66(1) A, respectively and agree well with those observed in the amorphous phase of the common phase-change material Ge{sub 2}Sb{sub 2}Te{sub 5}. After crystallizing the sample at 250 deg. C, very different EXAFS spectra with modified Ge-Sb bond lengths are observed. The higher concentration of Ge neighbors at the Ge edge as compared to the as-deposited sample is indicative for phase separation. For the corresponding sample, XRD does not show reflections of Ge, which indicates that the agglomeration of Ge is amorphous or below the coherence length of the x-radiation. The EXAFS spectrum shows a superposition of two phases: one with bond lengths which agree with sp{sup 3}-hybridized Ge [2.43(1) A] and another one with longer Ge-Ge bond lengths [2.79(8) A]. This result can be explained by phase separation in the material.

Zalden, Peter; Eijk, Julia van; Wuttig, Matthias [I. Physikalisches Institut (IA), RWTH Aachen, 52056 Aachen (Germany); Bichara, Christophe [CiNaM-Centre Interdisciplinaire de Nanoscience de Marseille, Campus de Luminy, 13288 Marseille (France); Braun, Carolin; Bensch, Wolfgang [Institut fuer Anorganische Chemie, Universitaet Kiel, Max-Eyth Str. 2, 24118 Kiel (Germany)

2010-05-15T23:59:59.000Z

458

Electronic structure, molecular orientation, charge transfer dynamics and solar cells performance in donor/acceptor copolymers and fullerene: Experimental and theoretical approaches  

SciTech Connect

By combining experimental and theoretical approaches, the electronic structure, molecular orientation, charge transfer dynamics and solar cell performance in donor/acceptor copolymer poly[2,7-(9,9-bis(2-ethylhexyl)-dibenzosilole)-alt-4,7-bis(thiophen-2-yl) benzo-2,1,3-thiadiazole] (PSiF-DBT) films and blended with 6,6.-phenyl-C 61-butyric acid methyl ester (PSiF-DBT:PCBM) were investigated. Good agreement between experimental and theoretical PSiF-DBT UV-Vis absorption spectrum is observed and the main molecular orbitals contributing to the spectrum were determined using DFT single point calculations. Non-coplanar configuration was determined by geometric optimization calculation in isolated PSiF-DBT pentamer and corroborated by angular variation of the sulphur 1s near-edge X-ray absorption fine structure (NEXAFS) spectra. Edge-on and plane-on molecular orientations were obtained for thiophene and benzothiadiazole units, respectively. A power conversion efficiency up to 1.58%, open circuit voltage of 0.51 V, short circuit current of 8.71 mA/cm{sup 2} and a fill factor of 35% was obtained using blended PSiF-DBT:PCBM as active layer in a bulk heterojunction solar cell. Ultrafast electron dynamics in the low-femtosecond regime was evaluated by resonant Auger spectroscopy using the core-hole clock methodology around sulphur 1s absorption edge. Electron delocalization times for PSiF-DBT and PSiF-DBT:PCBM polymeric films were derived for selected excitation energies corresponding to the main transitions in the sulphur 1s NEXAFS spectra. The mixture of PSiF-DBT with PCBM improves the charge transfer process involving the ?* molecular orbital of the thiophene units.

Garcia-Basabe, Y.; Borges, B. G. A. L.; Rocco, M. L. M., E-mail: lsroman@fisica.ufpr.br, E-mail: luiza@iq.ufrj.br [Institute of Chemistry, Federal University of Rio de Janeiro, Rio de Janeiro 21941-909 (Brazil); Marchiori, C. F. N.; Yamamoto, N. A. D.; Koehler, M.; Roman, L. S., E-mail: lsroman@fisica.ufpr.br, E-mail: luiza@iq.ufrj.br [Departament of Physics, Federal University of Paran, Curitiba 81531-990 (Brazil); Macedo, A. G. [Departament of Physics, Technological Federal University of Paran, Curitiba 80230-901 (Brazil)

2014-04-07T23:59:59.000Z

459

Dynamic molecular structure of plant biomass-derived black carbon (biochar)  

SciTech Connect

Char black carbon (BC), the solid residue of incomplete combustion, is continuously being added to soils and sediments due to natural vegetation fires, anthropogenic pollution, and new strategies for carbon sequestration ('biochar'). Here we present a molecular-level assessment of the physical organization and chemical complexity of biomass-derived chars and, specifically, that of aromatic carbon in char structures. BET-N{sub 2} surface area, X-ray diffraction (XRD), synchrotron-based Near-edge X-ray Absorption Fine Structure (NEXAFS), and Fourier transform infrared (FT-IR) spectroscopy are used to show how two plant materials (wood and grass) undergo analogous, but quantitatively different physical-chemical transitions as charring temperature increases from 100 to 700 C. These changes suggest the existence of four distinct categories of char consisting of a unique mixture of chemical phases and physical states: (i) in transition chars the crystalline character of the precursor materials is preserved, (ii) in amorphous chars the heat-altered molecules and incipient aromatic polycondensates are randomly mixed, (iii) composite chars consist of poorly ordered graphene stacks embedded in amorphous phases, and (iv) turbostratic chars are dominated by disordered graphitic crystallites. The molecular variations among the different char categories translate into differences in their ability to persist in the environment and function as environmental sorbents.

Keiluweit, M.; Nico, P.S.; Johnson, M.G.; Kleber, M.

2009-11-15T23:59:59.000Z

460

Importance of structural order for the low surface energy of perfluoroalkyl substituted polymethacrylates  

Science Journals Connector (OSTI)

Low surface energy coatings or anti-wetting agents play an essential role in microelectronics, anti-fogging and anti-fouling applications, and even have promising medical applications. Currently, perfluoroalkyl substituted polymethacrylates (PFPMs) are widely in use, and the anti-wetting properties of these and related polymers are believed to arise from the segregation of CF3 groups to the surface. However, proof of a direct correlation between surface energies and surface structure, and the importance of the order in the underlying bulk is still lacking. Here we report near edge X-ray absorption fine structure (NEXAFS) results which establish such a correlation. Our studies of three \\{PFPMs\\} with, respectively, isotropic, nematic, and smectic A bulk phases at room temperature reveal in all cases a greater order at the surface than in the bulk. The surface order parameter is found to correlate with the surface energy, which we find indeed to be lowered by segregation of CF3 groups to the film surface. Most importantly, temperature dependent NEXAFS measurements in the 20140C range, covering bulk phase transitions from smectic A to nematic to isotropic, show that it is the bulk order (phase) which ultimately limits the achievable surface order, and hence the surface properties.

J. Lning; D.Y. Yoon; J. Sthr

2001-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "absorption fine structure" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

Pressure Effects of Foreign Gases on the Absorption Lines of Cesium. IV. The Effects of Neon  

Science Journals Connector (OSTI)

The effect of Ne on the fine-structure components of the first four members of the Cs principal series is described. Less detailed information is provided for higher series members up to Cs(20)/Ne, with the emphasis on the shift of the P322 component. Both components of Cs(1)/Ne shift toward the red for relative density (r.d.)<24, above which point the P122 component shifts to the violet. For Cs(2)/Ne the P122 component has almost zero slope initially and shifts to the violet. The P322 component shifts to the red initially, but above r.d.=14 it is also violet-shifted. The Cs(2)/Ne shift curves are both linear above r.d.=25. Both components of all higher members are observed to be violet-shifted in all regions, with fine-structure effects becoming less apparent. Half-widths are observed to be nonlinear with density in all regions studied. Temperature effects are described for Cs(1)/Ne and Cs(2)/Ne, with an increase in temperature causing a large increase in violet shift (or decrease in red shift) at low pressures. The possible existence of a violet satellite for the long-wavelength component of Cs(2)/Ne as well as the short-wavelength component is reported.

Robert O. Garrett; Shang Yi Ch'en; Eng Choon Looi

1967-04-05T23:59:59.000Z

462

CO2 Capture by Absorption with Potassium Carbonate  

E-Print Network (OSTI)

CO2 Capture by Absorption with Potassium Carbonate Fourth Quarterly Report 2006 Quarterly Progress of this work is to improve the process for CO2 capture by alkanolamine absorption/stripping by developing% in the order: thiosulfatecarbonate is ineffective in the absence of oxygen

Rochelle, Gary T.

463

Carbon Dioxide Capture by Chemical Absorption: A Solvent Comparison Study  

E-Print Network (OSTI)

1 Carbon Dioxide Capture by Chemical Absorption: A Solvent Comparison Study by Anusha Kothandaraman Students #12;2 #12;3 Carbon Dioxide Capture by Chemical Absorption: A Solvent Comparison Study by Anusha with electricity generation accounting for 40% of the total1 . Carbon capture and sequestration (CCS) is one

464

CO2 Capture by Absorption with Potassium Carbonate  

E-Print Network (OSTI)

CO2 Capture by Absorption with Potassium Carbonate Second Quarterly Report 2006 Quarterly Progress of this work is to improve the process for CO2 capture by alkanolamine absorption/stripping by developing for simultaneous removal of CO2 and SO2. Corrosion of carbon steel in uninhibited MEA solution is increased

Rochelle, Gary T.

465

CO2 Capture by Absorption with Potassium Carbonate  

E-Print Network (OSTI)

CO2 Capture by Absorption with Potassium Carbonate First Quarterly Report 2007 Quarterly Progress of this work is to improve the process for CO2 capture by alkanolamine absorption/stripping by developing% to 160% in the order: thiosulfatecarbonate is ineffective

Rochelle, Gary T.

466

CO2 Capture by Absorption with Potassium Carbonate  

E-Print Network (OSTI)

CO2 Capture by Absorption with Potassium Carbonate Third Quarterly Report 2006 Quarterly Progress of this work is to improve the process for CO2 capture by alkanolamine absorption/stripping by developing by Jou and Mather. Corrosion of carbon steel without inhibitors increases from 19 to 181 mpy in lean

Rochelle, Gary T.

467

Simulations of solar cell absorption enhancement using resonant modes  

E-Print Network (OSTI)

Simulations of solar cell absorption enhancement using resonant modes of a nanosphere array Jonathan Grandidier Michael G. Deceglie Dennis M. Callahan Harry A. Atwater #12;Simulations of solar cell for enhancing the absorption of thin-film amorphous silicon solar cells using periodic arrangements of resonant

Grandidier, Jonathan

468

Optical absorption intensity of semiconductor single-wall carbon nanotubes  

E-Print Network (OSTI)

Optical absorption intensity of semiconductor single-wall carbon nanotubes Y. Oyama1 , R. Saito1. The optical absorption intensity is inversely proportional to the diameter in the unit of per carbon atom of single-wall carbon nanotubes (SWNT) synthesized by alcohol CCVD (ACCVD) method and HiPco method [1

Maruyama, Shigeo

469

Control of enhanced optical absorption in {mu}c-Si  

SciTech Connect

The influence of grain size on the enhanced optical absorption of {micro}c-Si has been investigated using films of various grain sizes prepared by solid phase crystallization. The authors show that they can control this grain size and therefore the degree of absorption changes. For grain sizes below a threshold range significant absorption enhancement can be seen in the photon energy range of 1 to {approximately}3 eV and the absorption characteristics of these films show that the dominant mode of optical transitions is indirect. A correlation between first order Raman peak broadening and enhanced absorption was found suggesting both effects are related to confinement. A simple model was developed to see how confinement in the crystallites could influence indirect optical transitions.

Kalkan, A.K.; Fonash, S.J.

1997-07-01T23:59:59.000Z

470

Cross section for charmonium absorption by nucleons  

E-Print Network (OSTI)

152igpNNN? ~p3!g5N~p1! 1 t2mp 2 ~M 1a1M 1b1M 1c!, ~12! M 25grNNN? ~p3!Fgm1i kr2mN sam~p12p3!aG 3N~p1!F2gmn1 ~p12p3!m~p12p3!n mr 2 G 1t2mr2 3~M 2an 1M 2bn 1M 2cn !, ~13! where p1 and p3 are the four momenta of the initial and final nucleons... to the virtual pion and r meson from the nucleon as functions of center- of-mass energy. FIG. 3. J/c absorption by nucleons via charm exchange. 3 W. LIU, C. M. KO, AND Z. W. LIN PHYSICAL REVIEW C 65 015203 LDNLc5igDNLc~N? g5LcD?1DL? cg5N !, ~19! LD*NLc5g...

Liu, W.; Ko, Che Ming; Lin, ZW.

2002-01-01T23:59:59.000Z

471

Absorption media for irreversibly gettering thionyl chloride  

DOE Patents (OSTI)

Thionyl chloride is a hazardous and reactive chemical used as the liquid cathode in commercial primary batteries. Contrary to previous thinking, ASZM-TEDA.RTM. carbon (Calgon Corporation) reversibly absorbs thionyl chloride. Thus, several candidate materials were examined as irreversible getters for thionyl chloride. The capacity, rate and effect of temperature were also explored. A wide variety of likely materials were investigated through screening experiments focusing on the degree of heat generated by the reaction as well as the material absorption capacity and irreversibility, in order to help narrow the group of possible getter choices. More thorough, quantitative measurements were performed on promising materials. The best performing getter was a mixture of ZnO and ASZM-TEDA.RTM. carbon. In this example, the ZnO reacts with thionyl chloride to form ZnCl.sub.2 and SO.sub.2. The SO.sub.2 is then irreversibly gettered by ASZM-TEDA.RTM. carbon. This combination of ZnO and carbon has a high capacity, is irreversible and functions effectively above -20.degree. C.

Buffleben, George (Tracy, CA); Goods, Steven H. (Livermore, CA); Shepodd, Timothy (Livermore, CA); Wheeler, David R. (Albuquerque, NM); Whinnery, Jr., LeRoy (Danville, CA)

2002-01-01T23:59:59.000Z

472

X-RAY ABSORPTION SPECTROSCOPY OF TRANSITION METAL-MAGNESIUM HYDRIDE FILMS  

NLE Websites -- All DOE Office Websites (Extended Search)

Spectroscopy of Transition Metal-Magnesium Spectroscopy of Transition Metal-Magnesium Hydride Thin Films T. J. Richardson a, *, B. Farangis a , J. L. Slack a , P. Nachimuthu b , R. Pereira b , N. Tamura b , and M. Rubin a a Environmental Energy Technologies Division, b Advanced Light Source, Ernest Orlando Lawrence Berkeley National Laboratory Berkeley, California 94720, USA *Corresponding author, E-mail address: tjrichardson@lbl.gov Abstract Mixed metal thin films containing magnesium and a first-row transition element exhibit very large changes in both reflectance and transmittance on exposure to hydrogen gas. Changes in electronic structure and coordination of the magnesium and transition metal atoms during hydrogen absorption were studied using dynamic in situ transmission mode X-ray absorption

473

Vibronic theory for the x-ray absorption spectrum of CF4 molecules  

Science Journals Connector (OSTI)

The C 1s x-ray absorption spectrum of CF4 molecules is theoretically investigated by calculating the line shape quantum mechanically based upon a vibronic model. It is found that the main peak with a broad width is attributed to the transition of the C 1s core electron to the antibonding valence orbitals which are coupled with the CF bond-stretching modes through the Jahn-Teller and the quasi-Jahn-Teller interactions. It is also clarified that the sharp asymmetric absorption line at the higher-energy side of the main band comes from the transition to the Rydberg states, where the interference effect between the Rydberg states and the vibronic state of the antibonding molecular orbitals leads to the asymmetric structure.

Shin-ichi Itoh; Satoshi Tanaka; Yosuke Kayanuma

1999-12-01T23:59:59.000Z

474

Two-photon absorption and emission by Rydberg atoms in coupled cavities  

E-Print Network (OSTI)

We study the dynamics of a system composed of two coupled cavities, each containing a single Rydberg atom. The interplay between Rydberg-Rydberg interaction and photon hopping enables the transition of the atoms from the collective ground state to the double Rydberg excitation state by individually interacting with the hybrid cavity modes and suppressing the up conversion process between them. The atomic transition is accompanied by the two-photon absorption and emission of the hybrid modes. Since the energy level structure of the atom-cavity system is photon number dependent, there is only a pair of states being in the two-photon resonance. Therefore, the system can act as a quantum nonlinear absorption filter through the nonclassical quantum process, converting coherent light field into a non-classical state. Meanwhile, the vacuum field in the cavity inspires the Rydberg atoms to simultaneously emit two photons into the hybrid mode, resulting in obvious emission enhancement of the mode.

Huaizhi Wu; Zhen-Biao Yang; Shi-Biao Zheng

2013-10-10T23:59:59.000Z

475

DOE Receives First Repayment from Successful DryFining™ Clean Coal Power  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Receives First Repayment from Successful DryFining™ Clean Coal Receives First Repayment from Successful DryFining™ Clean Coal Power Initiative Project DOE Receives First Repayment from Successful DryFining™ Clean Coal Power Initiative Project July 6, 2011 - 1:00pm Addthis Washington, DC - The success of a U.S. Department of Energy (DOE) Clean Coal Power Initiative (CCPI) project has led to a repayment of $580,000 to U.S. taxpayers, with much more - potentially exceeding $13 million - possible in the future. Great River Energy (GRE) of Maple Grove, Minn., made the payment to the Office of Fossil Energy's National Energy Technology Laboratory (NETL) recently as part of an agreement associated with the DryFining™ CCPI project. Implemented by NETL, CCPI is a cost-shared collaboration between the Federal government and private industry aimed at stimulating investment

476

Fine Tuning for Best-Value Super ESPC Deals Using the Responsibility Matrix  

Energy.gov (U.S. Department of Energy (DOE))

Fact sheet outlines the steps for Federal agencies to fine tune Super Energy Savings Performance Contracts (ESPCs) to get the best value using the Risk, Responsibility, and Performance Matrix.

477

Suppression of tin whisker formation on fine pitch connectors by surface roughening  

Science Journals Connector (OSTI)

In the electronics industry, lead-free solder processes such as the terminal plating of electronic components, fine pitch connectors, and flexible printed circuits (FPCs) are invariably hampered by the serious pr...

Makoto Takeuchi; Kouichi Kamiyama; Katsuaki Suganuma

2006-01-01T23:59:59.000Z

478

SciTech Connect: Towards a Fine-Resolution Global Coupled Climate...  

Office of Scientific and Technical Information (OSTI)

of this project was to contribute to the realization of a fully coupled fine resolution Earth System Model simulation in which a weather-scale atmosphere is coupled to an ocean in...

479

Fine Root Dynamics and Forest Production Across a Calcium Gradient in Northern Hardwood and Conifer Ecosystems  

Science Journals Connector (OSTI)

Losses of soil base cations due to acid rain have been implicated in declines of red spruce and sugar maple in the northeastern USA. We studied fine root and aboveground biomass and production in five northern ha...

Byung Bae Park; Ruth D. Yanai; Timothy J. Fahey; Scott W. Bailey

2008-03-01T23:59:59.000Z

480

On Consolidation of an Aerated Fine Powder 1 Kristy A. Coffey  

E-Print Network (OSTI)

: bunker Z R dz H(t) top surface In many applications, fine powders are stored in bunkers or silos and it will settle. The geometry here is that of a conical bunker. The container is assumed to be axisymmetric

Note: This page contains sample records for the topic "absorption fine structure" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


481

High-strain-rate nanoindentation behavior of fine-grained magnesium alloys  

E-Print Network (OSTI)

The effects of temperature and alloying elements on deformation in the high-strain-rate regime were investigated by testing fine-grained magnesium alloys with an average grain size of 2 ? 3 ?m by a nanoindentation technique. ...

Somekawa, Hidetoshi

482

Automatic fine-tuning and wind simulation at the Offshore Technology Research Center (OTRC)  

E-Print Network (OSTI)

A method for developing an automatic fine-tuning controller for matching a specification in the frequency domain is developed for the wind simulation equipment at the Offshore Technology Research Center (OTRC). A test signal synthesis method...

Miller, Mark Alan

2012-06-07T23:59:59.000Z

483

Low-Cycle Fatigue of Ultra-Fine-Grained Cryomilled 5083 Aluminum Alloy  

E-Print Network (OSTI)

of an Ultra-Fine Grained Aluminum Alloy, Poster Session,Grained Cryomilled 5083 Aluminum Alloy J.L. WALLEY, E.J.consistent with other MA aluminum alloys and is attributed

Walley, J. L.; Lavernia, E. J.; Gibeling, J. C.

2009-01-01T23:59:59.000Z

484

NMR Sensor for Onboard Ship Detection of Catalytic Fines in Marine Fuel Oils  

Science Journals Connector (OSTI)

NMR Sensor for Onboard Ship Detection of Catalytic Fines in Marine Fuel Oils ... Vermeire, M. B. Everything You Need to Know About Marine Fuels; Chevron Global Marine Products: Ghent, Belgium, 2007. ...

Morten K. Srensen; Mads S. Vinding; Oleg N. Bakharev; Tomas Nesgaard; Ole Jensen; Niels Chr. Nielsen

2014-07-02T23:59:59.000Z

485

Heavy absorption chillers: The Tortoise technology that can win  

SciTech Connect

Why has Absorption taken over 200 years to become a viable technology and secondarily what is the long term potential for heavy absorption technology? A third interesting question may be as some knowledgeable people in the North America industry have professed, is there a Window of Opportunity which was presented by the electric vapor compressor refrigerant issue which will be the last chance for absorption? Of course we know that absorption is not a new technology in 1994. It is however being rediscovered in many parts of the world by specifiers and engineers who are otherwise totally familiar with HVAC systems technology. As has been well documented in Japan, absorption heavy systems have been dominant for some time to the point that over 90% of the new units installed in the heavy systems category are absorption. Further by now 50% of the installed heavy systems tonnage in the country are absorption chillers. It did not take the electric vapor compressor refrigerant issue to make this huge market for absorption and there aren`t too many people in the HVAC business in Japan that view absorption as the {open_quotes}Tortoise technology.{close_quotes} If we only understood what the drivers were in Japan to create this absorption market then perhaps we could understand and possibly predict the long term potential for the technology in other markets of the world. We could actually go to work and look for markets that mirror the prevailing conditions in Japan. There will be those amongst us who will tell you that Japan is a unique market in almost every product category and most certainly with respect to heavy chiller systems.

Irwin, F.E.

1995-06-01T23:59:59.000Z