Powered by Deep Web Technologies
Note: This page contains sample records for the topic "magic angle spinning" 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.


1

In Situ 13C and 23Na Magic Angle Spinning NMR Investigation of...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

In Situ 13C and 23Na Magic Angle Spinning NMR Investigation of Supercritical CO2 Incorporation in Smectite-Natural Organic In Situ 13C and 23Na Magic Angle Spinning NMR...

2

Cryogenic sample exchange NMR probe for magic angle spinning dynamic nuclear polarization  

E-Print Network [OSTI]

We describe a cryogenic sample exchange system that dramatically improves the efficiency of magic angle spinning (MAS) dynamic nuclear polarization (DNP) experiments by reducing the time required to change samples and by ...

Barnes, Alexander B.

3

[superscript 15]N-[superscript 15]N Proton Assisted Recoupling in Magic Angle Spinning NMR  

E-Print Network [OSTI]

We describe a new magic angle spinning (MAS) NMR experiment for obtaining [superscript 15]N?[superscript 15]N correlation spectra. The approach yields direct information about the secondary and tertiary structure of proteins, ...

Lewandowski, Jozef R.

4

Re-analysis of Magic Angle Spinning Nuclear Magnetic Resonance Determination of Interlamellar Waters in Lipid Bilayer Dispersions  

E-Print Network [OSTI]

Re-analysis of Magic Angle Spinning Nuclear Magnetic Resonance Determination of Interlamellar Waters in Lipid Bilayer Dispersions John F. Nagle,*# Yufeng Liu,* Stephanie Tristram-Nagle,# Richard M of multilamellar lipid vesicles using magic angle spinning nuclear magnetic resonance has been re

Nagle, John F.

5

Devices and process for high-pressure magic angle spinning nuclear magnetic resonance  

DOE Patents [OSTI]

A high-pressure magic angle spinning (MAS) rotor is detailed that includes a high-pressure sample cell that maintains high pressures exceeding 150 bar. The sample cell design minimizes pressure losses due to penetration over an extended period of time.

Hoyt, David W; Sears, Jr., Jesse A; Turcu, Romulus V.F.; Rosso, Kevin M; Hu, Jian Zhi

2014-04-08T23:59:59.000Z

6

'Magic Angle Precession'  

SciTech Connect (OSTI)

An advanced and exact geometric description of nonlinear precession dynamics modeling very accurately natural and artificial couplings showing Lorentz symmetry is derived. In the linear description it is usually ignored that the geometric phase of relativistic motion couples back to the orbital motion providing for a non-linear recursive precession dynamics. The high coupling strength in the nonlinear case is found to be a gravitomagnetic charge proportional to the precession angle and angular velocity generated by geometric phases, which are induced by high-speed relativistic rotations and are relevant to propulsion technologies but also to basic interactions. In the quantum range some magic precession angles indicating strong coupling in a phase-locked chaotic system are identified, emerging from a discrete time dynamical system known as the cosine map showing bifurcations at special precession angles relevant to heavy nuclei stability. The 'Magic Angle Precession' (MAP) dynamics can be simulated and visualized by cones rolling in or on each other, where the apex and precession angles are indexed by spin, charge or precession quantum numbers, and corresponding magic angles. The most extreme relativistic warping and twisting effect is given by the Dirac spinor half spin constellation with 'Hyperdiamond' MAP, which resembles quark confinement.

Binder, Bernd [Quanics.com, Germany, 88679 Salem, P.O. Box 1247 (United States)], E-mail: binder@quanics.com

2008-01-21T23:59:59.000Z

7

High Temperature, Large Sample Volume, Constant Flow Magic Angle Spinning NMR Probe for a 11  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

High Temperature, Large Sample Volume, Constant Flow Magic Angle Spinning NMR Probe for a High Temperature, Large Sample Volume, Constant Flow Magic Angle Spinning NMR Probe for a 11.7 T Magnetic Field for In Situ Catalytic Reaction Characterization Project start date: April 1, 2007 EMSL Lead Investigator: Joseph Ford, EMSL High Field Magnetic Resonance Facility Co-investigators: Jian Zhi Hu, Macromolecular Structure and Dynamics, Biological Science Division, FCSD Jesse Sears and David W. Hoyt, EMSL High Field Magnetic Resonance Facility Detailed understanding of the mechanisms involved in a catalytic reaction requires identification of the nature of the active sites and the temporal evolution of reaction intermediates. Although optical methods such as UV-visible and infrared (IR) spectroscopies can be used for some types of reactions, these do not

8

High Resolution 1H NMR Spectroscopy of Metabolically Active Microorganisms Using Non-Destructive Magic Angle Spinning  

SciTech Connect (OSTI)

It is shown that the resolution of the 1H NMR metabolite spectra of densely packed microbial cells or biofilms attached to solid surfaces can be significantly enhanced with the so-called PASS R.F pulse sequence combined with slow (40-100 Hz) magic angle spinning of the sample. Hence this technique can be used to study biofilm metabolism under environmentally relevant conditions in a minimally invasive way.

Hu, Jian Z.; Wind, Robert A.; Mclean, Jeffrey S.; Gorby, Yuri A.; Resch, Charles T.; Fredrickson, Jim K.

2004-12-01T23:59:59.000Z

9

Indirectly detected chemical shift correlation NMR spectroscopy in solids under fast magic angle spinning  

SciTech Connect (OSTI)

The development of fast magic angle spinning (MAS) opened up an opportunity for the indirect detection of insensitive low-{gamma} nuclei (e.g., {sup 13}C and {sup 15}N) via the sensitive high-{gamma} nuclei (e.g., {sup 1}H and {sup 19}F) in solid-state NMR, with advanced sensitivity and resolution. In this thesis, new methodology utilizing fast MAS is presented, including through-bond indirectly detected heteronuclear correlation (HETCOR) spectroscopy, which is assisted by multiple RF pulse sequences for {sup 1}H-{sup 1}H homonuclear decoupling. Also presented is a simple new strategy for optimization of {sup 1}H-{sup 1}H homonuclear decoupling. As applications, various classes of materials, such as catalytic nanoscale materials, biomolecules, and organic complexes, are studied by combining indirect detection and other one-dimensional (1D) and two-dimensional (2D) NMR techniques. Indirectly detected through-bond HETCOR spectroscopy utilizing refocused INEPT (INEPTR) mixing was developed under fast MAS (Chapter 2). The time performance of this approach in {sup 1}H detected 2D {sup 1}H{l_brace}{sup 13}C{r_brace} spectra was significantly improved, by a factor of almost 10, compared to the traditional {sup 13}C detected experiments, as demonstrated by measuring naturally abundant organic-inorganic mesoporous hybrid materials. The through-bond scheme was demonstrated as a new analytical tool, which provides complementary structural information in solid-state systems in addition to through-space correlation. To further benefit the sensitivity of the INEPT transfer in rigid solids, the combined rotation and multiple-pulse spectroscopy (CRAMPS) was implemented for homonuclear {sup 1}H decoupling under fast MAS (Chapter 3). Several decoupling schemes (PMLG5{sub m}{sup {bar x}}, PMLG5{sub mm}{sup {bar x}x} and SAM3) were analyzed to maximize the performance of through-bond transfer based on decoupling efficiency as well as scaling factors. Indirect detection with assistance of PMLG{sub m}{sup {bar x}} during INEPTR transfer proved to offer the highest sensitivity gains of 3-10. In addition, the CRAMPS sequence was applied under fast MAS to increase the {sup 1}H resolution during t{sub 1} evolution in the traditional, {sup 13}C detected HETCOR scheme. Two naturally abundant solids, tripeptide N-formyl-L-methionyl-L-leucyl-L-phenylalanine (f-MLF-OH) and brown coal, with well ordered and highly disordered structures, respectively, are studied to confirm the capabilities of these techniques. Concomitantly, a simple optimization of {sup 1}H homonuclear dipolar decoupling at MAS rates exceeding 10 kHz was developed (Chapter 4). The fine-tuned decoupling efficiency can be obtained by minimizing the signal loss due to transverse relaxation in a simple spin-echo experiment, using directly the sample of interest. The excellent agreement between observed decoupling pattern and earlier theoretical predictions confirmed the utility of this strategy. The properties of naturally abundant surface-bound fluorocarbon groups in mesoporous silica nanoparticles (MSNs) were investigated by the above-mentioned multidimensional solid-state NMR experiments and theoretical modeling (Chapter 5). Two conformations of (pentafluorophenyl)propyl groups (abbreviated as PFP) were determined as PFP-prone and PFP-upright, whose aromatic rings are located above the siloxane bridges and in roughly upright position, respectively. Several 1D and 2D NMR techniques were implemented in the characterizations, including indirectly detected {sup 1}H{l_brace}{sup 13}C{r_brace} and {sup 19}F{l_brace}{sup 13}C{r_brace} 2D HETCOR, Carr-Purcell-Meiboom-Gill (CPMG) assisted {sup 29}Si direct polarization and {sup 29}Si{sup 19}F 2D experiments, 2D double-quantum (DQ) {sup 19}F MAS NMR spectra and spin-echo measurements. Furthermore, conformational details of two types of PFP were confirmed by theoretical calculation, operated by Dr. Takeshi Kobayashi. Finally, the arrangement of two surfactants, cetyltrimetylammoium bromide (CTAB) and cetylpyridinium bromide (CPB), mixed inside th

Mao, Kanmi

2011-08-15T23:59:59.000Z

10

/sup 13/C magic angle spinning NMR study of CO adsorption on Ru-exchanged zeolite Y  

SciTech Connect (OSTI)

Three types of adsorbed carbon monoxide are observed on Ru-Y zeolite by /sup 13/C magic angle spinning NMR: linear, bridged, and dicarbonyl CO. Samples exposed to CO at room temperature exhibit only linear and dicarbonyl species. At higher adsorption temperature bridged species are formed and a relative increase in dicarbonyl adsorption is observed. A smaller percentage of linear species is produced at high temperature. The electronic environments of linearly bonded CO are more diverse than those of bridging and dicarbonyl moieties. CO/sub 2/ is formed over Ru-Y zeolite upon initial exposure of the catalyst to CO at room temperature, apparently through reaction with unreduced metal oxide. 20 references, 2 figures, 1 table.

Shoemaker, R.K.; Apple, T.M.

1985-07-18T23:59:59.000Z

11

Experiments Optimized for Magic Angle Spinning and Oriented Sample Solid-State NMR of Proteins  

Science Journals Connector (OSTI)

Separated local field (SLF)(7-9) and homonuclear spin-exchange(10-12) experiments are among the mainstays of solid-state NMR of proteins. ... SLF experiments provide high spectral resolution due to the different orientational dependencies of the anisotropic heteronuclear dipolar(13) and chemical shift interactions, and the observed frequencies provide measurements of the angles between bonds (and functional groups) and the direction of alignment. ... In OS solid-state NMR, the basic SLF and spin-exchange experiments provide up to three orientationally dependent frequencies for each isotopically labeled site (e.g., 1H–15N dipolar coupling, 1H chemical shift, and 15N chemical shift), and this not only resolves many of the protein’s signals, even in crowded spectral regions, but also yields adequate input for structure calculations in aligned samples. ...

Bibhuti B. Das; Eugene C. Lin; Stanley J. Opella

2013-09-17T23:59:59.000Z

12

A study of the order-disorder, solid-solid phase transition of (+)-camphor using nuclear magnetic resonance with cross-polarization and magic-angle spinning  

E-Print Network [OSTI]

Parameters in the Rotating Frame . 52 a. Proton Spin-Lattice Relaxation in the Rotating Frame. . . 52 b. T and Contact Time. CH c. Carbon Spin-Lattice Relaxation in the Rotating Frame. 53 54 d. Adiabatic Demagnetization in the Rotating Frame. 56 2... the orientation of the magic-angle sample spinning with respect to B 0 Figure 1. 9. Illustrates the pulse sequence used for cross-polarization. S. L. represents the proton spin-lock time. . 39 . 45 Figure 1. 10. Depicts the cross-polarization process as a...

Crook, Russell Allan

2012-06-07T23:59:59.000Z

13

Spinning angle optical calibration apparatus  

DOE Patents [OSTI]

An optical calibration apparatus is provided for calibrating and reproducing spinning angles in cross-polarization, nuclear magnetic resonance spectroscopy. An illuminated magnifying apparatus enables optical setting an accurate reproducing of spinning "magic angles" in cross-polarization, nuclear magnetic resonance spectroscopy experiments. A reference mark scribed on an edge of a spinning angle test sample holder is illuminated by a light source and viewed through a magnifying scope. When the "magic angle" of a sample material used as a standard is attained by varying the angular position of the sample holder, the coordinate position of the reference mark relative to a graduation or graduations on a reticle in the magnifying scope is noted. Thereafter, the spinning "magic angle" of a test material having similar nuclear properties to the standard is attained by returning the sample holder back to the originally noted coordinate position.

Beer, Stephen K. (Morgantown, WV); Pratt, II, Harold R. (Morgantown, WV)

1991-01-01T23:59:59.000Z

14

E-Print Network 3.0 - angle spinning mas Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

. Introduction Magic angle spinning (MAS) is an essential NMR technique for studying disordered samples... proteins as demonstrated in the so-called MAOSS (magic angle...

15

Structural analysis of lithium-excess lithium manganate cathode materials by 7Li magic-angle spinning nuclear magnetic resonance spectroscopy  

Science Journals Connector (OSTI)

The local structures of lithium-excess lithium manganese spinel oxides were studied by high-resolution solid-state 7Li magic-angle spinning (MAS) NMR spectroscopy. Two resonance lines at ?500 and ?555 ppm were observed for the spinels in 7Li MAS NMR spectra. Spinel stability tests in which spinel powder was stored in electrolyte solution were performed to analyze the changes in the lithium local structure after manganese dissolution. After the spinel stability test, the intensity of the resonance at ?500 ppm decreased, whereas new resonance line at 0 ppm was observed. The lithium content of the 0 ppm peak increases with the storage time in electrolyte. SEM and chemical analysis suggested a surface coating of non-spinel lithium compounds, the presence of defects on particles surface and fluorine incorporation into the aged spinel. In addition, about 60–70% of lithium remains in the spinel framework after the storage.

Hideyuki Oka; Senshi Kasahara; Tadashi Okada; Eiichi Iwata; Masaki Okada; Takayuki Shoji; Hiroshi Ohki; Tsutomu Okuda

2001-01-01T23:59:59.000Z

16

A Large Sample Volume Magic Angle Spinning Nuclear Magnetic Resonance Probe for In-Situ Investigations with Constant Flow of Reactants  

SciTech Connect (OSTI)

A large-sample-volume constant-flow magic angle sample spinning (CF-MAS) NMR probe is reported for in-situ studies of the reaction dynamics, stable intermediates/transition states, and mechanisms of catalytic reactions. In our approach, the reactants are introduced into the catalyst bed using a fixed tube at one end of the MAS rotor while a second fixed tube, linked to a vacuum pump, is attached at the other end of the rotor. The pressure difference between both ends of the catalyst bed inside the sample cell space forces the reactants flowing through the catalyst bed, which improves the diffusion of the reactants and products. This design allows the use of a large sample volume for enhanced sensitivity and thus permitting in-situ 13C CF-MAS studies at natural abundance. As an example of application, we show that reactants, products and reaction transition states associated with the 2-butanol dehydration reaction over a mesoporous silicalite supported heteropoly acid catalyst (HPA/meso-silicalite-1) can all be detected in a single 13C CF-MAS NMR spectrum at natural abundance. Coke products can also be detected at natural 13C abundance and under the stopped flow condition. Furthermore, 1H CF-MAS NMR is used to identify the surface functional groups of HPA/meso-silicalite-1 under the condition of in-situ drying . We also show that the reaction dynamics of 2-butanol dehydration using HPA/meso-silicalite-1 as a catalyst can be explored using 1H CF-MAS NMR.

Hu, Jian Z.; Sears, Jesse A.; Mehta, Hardeep S.; Ford, Joseph J.; Kwak, Ja Hun; Zhu, Kake; Wang, Yong; Liu, Jun; Hoyt, David W.; Peden, Charles HF

2012-02-21T23:59:59.000Z

17

Magic angles and cross-hatching instability in hydrogel fracture  

E-Print Network [OSTI]

The full 2D analysis of roughness profiles of fracture surfaces resulting from quasi-static crack propagation in gelatin gels reveals an original behavior characterized by (i) strong anisotropy with maximum roughness at $V$-independent symmetry-preserving angles, (ii) a sub-critical instability leading, below a critical velocity, to a cross-hatched regime due to straight macrosteps drifting at the same magic angles and nucleated on crack-pinning network inhomogeneities. Step height values are determined by the width of the strain-hardened zone, governed by the elastic crack blunting characteristic of soft solids with breaking stresses much larger that low strain moduli.

Tristan Baumberger; Christiane Caroli; David Martina; Olivier Ronsin

2008-02-29T23:59:59.000Z

18

Dynamic-angle spinning and double rotation of quadrupolar nuclei  

SciTech Connect (OSTI)

Nuclear magnetic resonance (NMR) spectroscopy of quadrupolar nuclei is complicated by the coupling of the electric quadrupole moment of the nucleus to local variations in the electric field. The quadrupolar interaction is a useful source of information about local molecular structure in solids, but it tends to broaden resonance lines causing crowding and overlap in NMR spectra. Magic- angle spinning, which is routinely used to produce high resolution spectra of spin-{1/2} nuclei like carbon-13 and silicon-29, is incapable of fully narrowing resonances from quadrupolar nuclei when anisotropic second-order quadrupolar interactions are present. Two new sample-spinning techniques are introduced here that completely average the second-order quadrupolar coupling. Narrow resonance lines are obtained and individual resonances from distinct nuclear sites are identified. In dynamic-angle spinning (DAS) a rotor containing a powdered sample is reoriented between discrete angles with respect to high magnetic field. Evolution under anisotropic interactions at the different angles cancels, leaving only the isotropic evolution of the spin system. In the second technique, double rotation (DOR), a small rotor spins within a larger rotor so that the sample traces out a complicated trajectory in space. The relative orientation of the rotors and the orientation of the larger rotor within the magnetic field are selected to average both first- and second-order anisotropic broadening. The theory of quadrupolar interactions, coherent averaging theory, and motional narrowing by sample reorientation are reviewed with emphasis on the chemical shift anisotropy and second-order quadrupolar interactions experienced by half-odd integer spin quadrupolar nuclei. The DAS and DOR techniques are introduced and illustrated with application to common quadrupolar systems such as sodium-23 and oxygen-17 nuclei in solids.

Mueller, K.T. (Lawrence Berkeley Lab., CA (United States) California Univ., Berkeley, CA (United States). Dept. of Chemistry)

1991-07-01T23:59:59.000Z

19

Discrete magic angle turning system, apparatus, and process for in situ magnetic resonance spectroscopy and imaging  

DOE Patents [OSTI]

Described are a "Discrete Magic Angle Turning" (DMAT) system, devices, and processes that combine advantages of both magic angle turning (MAT) and magic angle hopping (MAH) suitable, e.g., for in situ magnetic resonance spectroscopy and/or imaging. In an exemplary system, device, and process, samples are rotated in a clockwise direction followed by an anticlockwise direction of exactly the same amount. Rotation proceeds through an angle that is typically greater than about 240 degrees but less than or equal to about 360 degrees at constant speed for a time applicable to the evolution dimension. Back and forth rotation can be synchronized and repeated with a special radio frequency (RF) pulse sequence to produce an isotropic-anisotropic shift 2D correlation spectrum. The design permits tubes to be inserted into the sample container without introducing plumbing interferences, further allowing control over such conditions as temperature, pressure, flow conditions, and feed compositions, thus permitting true in-situ investigations to be carried out.

Hu, Jian Zhi (Richland, WA); Sears, Jr., Jesse A. (Kennewick, WA); Hoyt, David W. (Richland, WA); Wind, Robert A. (Kennewick, WA)

2009-05-19T23:59:59.000Z

20

Concepts in spin echo small-angle neutron scattering  

Science Journals Connector (OSTI)

Two-dimensional spin echo small-angle neutron scattering experiments are proposed for the direct measurement of the vector-length distribution function. Interpretation of the correlation function from one-dimensional experiments is also presented.

Zhao, J.

2001-09-25T23:59:59.000Z

Note: This page contains sample records for the topic "magic angle spinning" 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

E-Print Network 3.0 - angle spinning solid-state Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

spinning solid-state Search Powered by Explorit Topic List Advanced Search Sample search results for: angle spinning solid-state Page: << < 1 2 3 4 5 > >> 1 Book Review Melinda J....

22

Contrast variation in spin-echo small angle neutron scattering  

Science Journals Connector (OSTI)

The use of contrast variation in spin-echo small angle neutron scattering (SESANS) experiments is discussed for the case of colloidal structural investigation. On the basis of calculations for several model systems, we find that the contrast variation SESANS technique, in terms of the measured SESANS correlation function G(z), is not sensitive to the structural characteristics of colloidal suspensions consisting of particles with uniform scattering length density profiles. However, its ability to resolve structural heterogeneity, at both intra-colloidal and inter-colloidal length scales, is clearly demonstrated. The prospect of using this new technique to investigate structural information that is difficult to probe in other ways is also explored.

Xin Li; Bin Wu; Yun Liu; Roger Pynn; Chwen-Yang Shew; Gregory S Smith; Kenneth W Herwig; J Lee Robertson; Wei-Ren Chen; Li Liu

2012-01-01T23:59:59.000Z

23

Influence of thermal motion upon the lineshape in magic-angle-spinning experiments  

Science Journals Connector (OSTI)

The influence of isotropic thermal motion upon MAS NMR spectra is treated theoretically for (i) dominating inhomogeneous magnetic dipolar interaction and (ii) dominating anisotropic chemical shielding interaction. General formulas are derived which describe quantitatively the influence of thermal motion upon the shape of the central line and of the whole sideband pattern. The results of (i) are compared with those of former studies which are shown to be special cases of the general theory presented here.

D Fenzke; B.C Gerstein; H Pfeifer

1992-01-01T23:59:59.000Z

24

High-temperature in situ magic-angle spinning NMR studies of chemical reactions on catalysts  

E-Print Network [OSTI]

temperature jump to 623 K. Important differences observed in this study relative to previous investigations at lower temperatures include well-resolved signals for adsorbed versus exogenous (gas phase) methanol and dimethyl ether, and a higher yield... described in the text. 29 Expanded view of the first three spectra in Figure 7 showing the regions containing methanol and dimethyl ether. In the high- temperature spectra two peaks are present for both species; gas phase (48. 0 ppm) and adsorbed (53. 1...

Oliver, F. Gregory

2012-06-07T23:59:59.000Z

25

Structural Characterization of GNNQQNY Amyloid Fibrils by Magic Angle Spinning NMR  

E-Print Network [OSTI]

Several human diseases are associated with the formation of amyloid aggregates, but experimental characterization of these amyloid fibrils and their oligomeric precursors has remained challenging. Experimental and computational ...

Griffin, Robert Guy

26

E-Print Network 3.0 - angle spinning nuclear Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

nuclear Search Powered by Explorit Topic List Advanced Search Sample search results for: angle spinning nuclear Page: << < 1 2 3 4 5 > >> 1 PUBLISHED ONLINE: 10 MAY 2009 | DOI:...

27

Proton Assisted Recoupling at High Spinning Frequencies  

E-Print Network [OSTI]

We demonstrate the successful application of [superscript 13]C?[superscript 13]C proton assisted recoupling (PAR) on [U?[superscript 13]C,[superscript 15]N] N-f-MLF-OH and [U?13C,15N] protein GB1 at high magic angle spinning ...

Struppe, Jochem

28

Amyloid fibril structure of peptides and proteins by magic angle spinning NMR spectroscopy and dynamic nuclear polarization  

E-Print Network [OSTI]

Amyloid fibrils are insoluble, non-crystalline protein filaments associated with a number of diseases such as Alzheimer's and Type Il diabetes. They can have a functional role in different organisms and many proteins and ...

Debelouchina, Galia Tzvetanova

2011-01-01T23:59:59.000Z

29

Magic angle spinning NMR applied to membrane protein 2D crystals : the structure and function of VDAC  

E-Print Network [OSTI]

Membrane proteins mediate critical functions in biological systems and are important drug targets for a number of diseases. Determining the three-dimensional structure and function of membrane proteins under physologically ...

Eddy, Matthew T. (Matthew Thomas)

2012-01-01T23:59:59.000Z

30

Structure and function of the Influenza membrane protein M2 by magic angle spinning NMR and dynamic nuclear polarization  

E-Print Network [OSTI]

Determination of the 3D structure of membrane proteins is a frontier that is rapidly being explored due to the importance of membrane proteins in regulating cellular processes and because they are the target of many drugs. ...

Andreas, Loren B

2014-01-01T23:59:59.000Z

31

Upgrade of the MAGIC telescopes  

E-Print Network [OSTI]

The MAGIC telescopes are two Imaging Atmospheric Cherenkov Telescopes (IACTs) located on the Canary island of La Palma. With 17m diameter mirror dishes and ultra-fast electronics, they provide an energy threshold as low as 50 GeV for observations at low zenith angles. The first MAGIC telescope was taken in operation in 2004 whereas the second one joined in 2009. In 2011 we started a major upgrade program to improve and to unify the stereoscopic system of the two similar but at that time different telescopes. Here we report on the upgrade of the readout electronics and digital trigger of the two telescopes, the upgrade of the camera of the MAGIC I telescope as well as the commissioning of the system after this major upgrade.

Mazin, Daniel; Garczarczyk, Markus; Giavitto, Gianluca; Sitarek, Julian

2014-01-01T23:59:59.000Z

32

E-Print Network 3.0 - angle field spinning Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

a pure spin current was converted into electric current by application of a magnetic field... ). This feature is crucial for spintronic allowing spin manipulation by external...

33

E-Print Network 3.0 - angle spinning 1h Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Chemistry 9 2380 IEEE TRANSACTIONS ON MAGNETICS, VOL. 37, NO. 4, JULY 2001 General Spin Wave Instability Theory Summary: normal, as indicated. The spin wave linewidth 1H was set at...

34

Transverse Beam Spin Asymmetries at Backward Angles in Elastic Electron-Proton and Quasi-elastic Electron-Deuteron Scattering  

E-Print Network [OSTI]

We have measured the beam-normal single-spin asymmetries in elastic scattering of transversely polarized electrons from the proton, and performed the first measurement in quasi-elastic scattering on the deuteron, at backward angles (lab scattering angle of 108 degrees) for Q2 = 0.22 GeV^2/c^2 and 0.63 GeV^2/c^2 at beam energies of 362 MeV and 687 MeV, respectively. The asymmetry arises due to the imaginary part of the interference of the two-photon exchange amplitude with that of single photon exchange. Results for the proton are consistent with a model calculation which includes inelastic intermediate hadronic (piN) states. An estimate of the beam-normal single-spin asymmetry for the scattering from the neutron is made using a quasi-static deuterium approximation, and is also in agreement with theory.

The G0 Collaboration; D. Androi?; D. S. Armstrong; J. Arvieux; S. L. Bailey; D. H. Beck; E. J. Beise; J. Benesch; F. Benmokhtar; L. Bimbot; J. Birchall; P. Bosted; H. Breuer; C. L. Capuano; Y. -C. Chao; A. Coppens; C. A. Davis; C. Ellis; G. Flores; G. Franklin; C. Furget; D. Gaskell; M. T. W. Gericke; J. Grames; G. Guillard; J. Hansknecht; T. Horn; M. K. Jones; P. M. King; W. Korsch; S. Kox; L. Lee; J. Liu; A. Lung; J. Mammei; J. W. Martin; R. D. McKeown; A. Micherdzinska; M. Mihovilovic; H. Mkrtchyan; M. Muether; S. A. Page; V. Papavassiliou; S. F. Pate; 10 S. K. Phillips; P. Pillot; M. L. Pitt; M. Poelker; B. Quinn; W. D. Ramsay; J. -S. Real; J. Roche; P. Roos; J. Schaub; T. Seva; N. Simicevic; G. R. Smith; D. T. Spayde; M. Stutzman; R. Suleiman; V. Tadevosyan; W. T. H. van Oers; M. Versteegen; E. Voutier; W. Vulcan; S. P. Wells; S. E. Williamson; S. A. Wood; B. Pasquini; M. Vanderhaeghen

2011-06-16T23:59:59.000Z

35

Spin-echo small-angle neutron scattering in neutron reflectometry  

Science Journals Connector (OSTI)

A new method to perform neutron reflectometry measurements is discussed, based on Larmor precession of polarized neutrons in the spin-echo mode.

Rekveldt, M.T.

2003-11-15T23:59:59.000Z

36

E-Print Network 3.0 - angle spinning nmr Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Summary: field of high- resolution spin-12 solid-state NMR. Then, separate-local-field (SLF) MAS techniques... NMR experi- ments is that which combines relatively fast sample...

37

Qutrit Magic State Distillation  

E-Print Network [OSTI]

Magic state distillation (MSD) is a purification protocol that plays a central role in fault tolerant quantum computation. Repeated iteration of the steps of a MSD protocol, generates pure single non-stabilizer states, or magic states, from multiple copies of a mixed resource state using stabilizer operations only. Thus mixed resource states promote the stabilizer operations to full universality. Magic state distillation was introduced for qubit-based quantum computation, but little has been known concerning MSD in higher dimensional qudit-based computation. Here, we describe a general approach for studying MSD in higher dimensions. We use it to investigate the features of a qutrit MSD protocol based on the 5-qutrit stabilizer code. We show that this protocol distills non-stabilizer magic states, and identify two types of states, that are attractors of this iteration map. Finally, we show how these states may be converted, via stabilizer circuits alone, into a state suitable for state injected implementation ...

Anwar, Hussain; Browne, Dan E

2012-01-01T23:59:59.000Z

38

Transverse Beam Spin Asymmetries in Forward-Angle Elastic Electron-Proton Scattering  

SciTech Connect (OSTI)

We have measured the beam-normal single-spin asymmetry in elastic scattering of transversely polarized 3 GeV electrons from unpolarized protons at Q{sup 2}=0.15, 0.25 (GeV/c){sup 2}. The results are inconsistent with calculations solely using the elastic nucleon intermediate state and generally agree with calculations with significant inelastic hadronic intermediate state contributions. A{sub n} provides a direct probe of the imaginary component of the 2{gamma} exchange amplitude, the complete description of which is important in the interpretation of data from precision electron-scattering experiments.

Armstrong, D. S.; Averett, T.; Bailey, S. L.; Finn, J. M.; Griffioen, K. A.; Moffit, B.; Phillips, S. K.; Secrest, J.; Sulkosky, V. [Department of Physics, College of William and Mary, Williamsburg, Virginia 23187 (United States); Arvieux, J.; Bimbot, L.; Guler, H.; Lenoble, J.; Marchand, D.; Morlet, M.; Ong, S.; Van de Wiele, J. [Institut de Physique Nucleaire d'Orsay, CNRS/IN2P3, Universite Paris Sud, Orsay (France); Asaturyan, R.; Mkrtchyan, H.; Stepanyan, S. [Yerevan Physics Institute, Yerevan 375036 (Armenia)] (and others)

2007-08-31T23:59:59.000Z

39

Melanoma Tumors Acquire a New Phospholipid Metabolism Phenotype under Cystemustine As Revealed by High-Resolution Magic Angle Spinning Proton Nuclear Magnetic Resonance Spectroscopy of Intact Tumor Samples  

Science Journals Connector (OSTI)

...serum albumin (BSA; Sigma-Aldrich) needed for reagent stability and blocking nonspecific binding (PBSA). Anti-CA125 monoclonal...filters, and selectively permeable membranes for debris and bubble removal, reagent pads, and blister packs for on-card reagent...

Daniel Morvan; Aicha Demidem; Janine Papon; Monique De Latour; and Jean Claude Madelmont

2002-03-15T23:59:59.000Z

40

"Optical" Spin Rotation Phenomenon and Spin Filtering of Antiproton (Proton, Deuteron) Beams in a Pseudomagnetic Field of a Polarized Target: the Possibility of Measuring the Real Part of the Coherent Zero-angle Scattering Amplitude  

E-Print Network [OSTI]

It is shown that in the experiments dedicated for producing of polarized beams of antiprotons during their passage through a polarized gas target placed in a storage ring it is possible to measure not only spin-dependent total cross-sections of antiproton scattering by the proton (deuteron), but also the spin-dependent real part of the coherent zero-angle scattering amplitude in the process of production of a polarized beam of antiprotons.

V. G. Baryshevsky

2011-01-17T23:59:59.000Z

Note: This page contains sample records for the topic "magic angle spinning" 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

Reading (for) Magical Gaps: The Novice Reader's Aesthetic Response to Magical Realism  

E-Print Network [OSTI]

new takes on magic’s surreptitious manifestations andmeaning constitutes surreptitious information rather thanparadigms because the surreptitious magic dwells in the

Ponzio, Carl Joseph

2013-01-01T23:59:59.000Z

42

Rapid high-resolution spin- and angle-resolved photoemission spectroscopy with pulsed laser source and time-of-flight spectrometer  

SciTech Connect (OSTI)

A high-efficiency spin- and angle-resolved photoemission spectroscopy (spin-ARPES) spectrometer is coupled with a laboratory-based laser for rapid high-resolution measurements. The spectrometer combines time-of-flight (TOF) energy measurements with low-energy exchange scattering spin polarimetry for high detection efficiencies. Samples are irradiated with fourth harmonic photons generated from a cavity-dumped Ti:sapphire laser that provides high photon flux in a narrow bandwidth, with a pulse timing structure ideally matched to the needs of the TOF spectrometer. The overall efficiency of the combined system results in near-E{sub F} spin-resolved ARPES measurements with an unprecedented combination of energy resolution and acquisition speed. This allows high-resolution spin measurements with a large number of data points spanning multiple dimensions of interest (energy, momentum, photon polarization, etc.) and thus enables experiments not otherwise possible. The system is demonstrated with spin-resolved energy and momentum mapping of the L-gap Au(111) surface states, a prototypical Rashba system. The successful integration of the spectrometer with the pulsed laser system demonstrates its potential for simultaneous spin- and time-resolved ARPES with pump-probe based measurements.

Gotlieb, K. [Graduate Group in Applied Science and Technology, University of California, Berkeley, California 94720 (United States)] [Graduate Group in Applied Science and Technology, University of California, Berkeley, California 94720 (United States); Hussain, Z.; Bostwick, A.; Jozwiak, C. [Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)] [Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States); Lanzara, A. [Department of Physics, University of California, Berkeley, California 94720, USA and Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)] [Department of Physics, University of California, Berkeley, California 94720, USA and Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)

2013-09-15T23:59:59.000Z

43

Solar Magic | Open Energy Information  

Open Energy Info (EERE)

Magic Magic Jump to: navigation, search Logo: Solar Magic Name Solar Magic Address 3350 Thomas Rd. Place Santa Clara, California Zip 95054 Sector Solar Product solar magic power optimizer Website http://www.solarmagic.com/home Coordinates 37.3822593°, -121.9580783° 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":37.3822593,"lon":-121.9580783,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

44

Spin- and angle-resolved photoemission study of chemisorbed p(1×1) O on epitaxial ultrathin Fe/W(001) films  

Science Journals Connector (OSTI)

Chemisorbed p(1×1) oxygen on ultrathin epitaxial Fe films grown on W(001) are studied using spin- and angle-resolved photoemission. In agreement with theoretical predictions, single-monolayer (ML) Fe films on W(001) are found to be nonmagnetic; 2-ML-thick Fe films are magnetic, and chemisorbed p(1×1) oxygen does not destroy the magnetism. Even- and odd-symmetry oxygen 2p-derived bands are measured along the ?¯-X¯ and ?¯-M¯ directions of the two-dimensional Brillouin zone. Oxygen-derived features in the photoemission spectra exhibit magnetic exchange splitting as well as spin-dependent intrinsic linewidths that are governed by lifetime effects and initial-state mixing with Fe bands. Oxygen 2p-band narrowing resulting from the expanded Fe thin-film lattice constant is observed. The results are compared with relevant calculations and corresponding experimental studies of p(1×1) oxygen on bulk Fe(001) surfaces.

R. L. Fink; G. A. Mulhollan; A. B. Andrews; J. L. Erskine; G. K. Walters

1992-05-01T23:59:59.000Z

45

Nuclear magic numbers: new features far from stability  

E-Print Network [OSTI]

The main purpose of the present manuscript is to review the structural evolution along the isotonic and isotopic chains around the "traditional" magic numbers 8; 20; 28; 50; 82 and 126. The exotic regions of the chart of nuclides have been explored during the three last decades. Then the postulate of permanent magic numbers was de nitely abandoned and the reason for these structural mutations has been in turn searched for. General trends in the evolution of shell closures are discussed using complementary experimental information, such as the binding energies of the orbits bounding the shell gaps, the trends of the rst collective states of the even-even semi-magic nuclei, and the behavior of certain single-nucleon states. Each section is devoted to a particular magic number. It describes the underlying physics of the shell evolution which is not yet fully understood and indicates future experimental and theoretical challenges. The nuclear mean eld embodies various facets of the Nucleon- Nucleon interaction, among which the spin-orbit and tensor terms play decisive roles in the shell evolutions. The present review intends to provide experimental constraints to be used for the re nement of theoretical models aiming at a good description of the existing atomic nuclei and at more accurate predictions of hitherto unreachable systems.

O. Sorlin; M. -G. Porquet

2008-05-16T23:59:59.000Z

46

Spin rotation and birefringence effect for a particle in a high energy storage ring and measurement of the real part of the coherent elastic zero-angle scattering amplitude, electric and magnetic polarizabilities  

E-Print Network [OSTI]

In the present paper the equations for the spin evolution of a particle in a storage ring are analyzed considering contributions from the tensor electric and magnetic polarizabilities of the particle. Study of spin rotation and birefringence effect for a particle in a high energy storage ring provides for measurement as the real part of the coherent elastic zero-angle scattering amplitude as well as tensor electric and magnetic polarizabilities. We proposed the method for measurement the real part of the elastic coherent zero-angle scattering amplitude of particles and nuclei in a storage ring by the paramagnetic resonance in the periodical in time nuclear pseudoelectric and pseudomagnetic fields.

V. G. Baryshevsky; A. A. Gurinovich

2005-06-14T23:59:59.000Z

47

Help:Magic words | Open Energy Information  

Open Energy Info (EERE)

Magic words Magic words (Redirected from Help:Variables) Jump to: navigation, search Magic words are strings of text that MediaWiki associates with a return value or function, such as time, site details, or page names. This page is about usage of standard magic words; for a technical reference, see Manual:Magic words. There are three general types of magic words: Behavior switches: these are uppercase words surrounded by double underscores, e.g. __FOO__ Variables: these are uppercase words surrounded by double braces, e.g. {{FOO}}. As such, they look a lot like templates. Parser functions: these take parameters and are either of the form {{foo:...}} or {{#foo:...}}. See also Help:Extension:ParserFunctions.

48

Magic Valley | Open Energy Information  

Open Energy Info (EERE)

Valley Valley Jump to: navigation, search Name Magic Valley Facility Magic Valley Sector Wind energy Facility Type Commercial Scale Wind Facility Status In Service Owner E.ON Climate & Renewables North America Developer E.ON Climate & Renewables North America Location Raymondville TX Coordinates 26.46534829°, -97.6725769° 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":26.46534829,"lon":-97.6725769,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

49

The Chemistry Magic Show Captivates Kids | GE Global Research  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Chemistry Magic Show Captivates Kids The Chemistry Magic Show Captivates Kids Vin Smentkowski 2012.11.16 My colleague, Christopher (Chris) Dosch, also known as Ignito the Magician,...

50

Malcolm Guite The Magic Apple Tree  

E-Print Network [OSTI]

Malcolm Guite The Magic Apple Tree Someday make a journey through the rain Through sodden streets in darkening December A journey to the magic apple tree. And journey also, darkling, through your past Journey records. You glimpsed it once within the garden wall, The image of an ancient apple tree, The fall

Robertson, Stephen

51

Help:Magic words | Open Energy Information  

Open Energy Info (EERE)

words words Jump to: navigation, search Magic words are strings of text that MediaWiki associates with a return value or function, such as time, site details, or page names. This page is about usage of standard magic words; for a technical reference, see Manual:Magic words. There are three general types of magic words: Behavior switches: these are uppercase words surrounded by double underscores, e.g. __FOO__ Variables: these are uppercase words surrounded by double braces, e.g. {{FOO}}. As such, they look a lot like templates. Parser functions: these take parameters and are either of the form {{foo:...}} or {{#foo:...}}. See also Help:Extension:ParserFunctions. Page-dependent magic words will affect or return data about the current

52

X-ray Crystallographic, Scanning Microprobe X-ray Diffraction, and Cross-Polarized/Magic Angle Spinning [superscript 13]C NMR Studies of the Structure of Cellulose III[subscript II  

SciTech Connect (OSTI)

The X-ray crystallographic structure of cellulose III{sub II} is characterized by disorder; the unit cell (space group P2{sub 1}; a = 4.45 {angstrom}, b = 7.64 {angstrom}, c = 10.36 {angstrom}, {alpha} = {beta} = 90{sup o}, {gamma} = 106.96{sup o}) is occupied by one chain that is the average of statistically disordered antiparallel chains. {sup 13}C CP/MAS NMR studies reveal the presence of three distinct molecular conformations that can be interpreted as a mixture of two different crystal forms, one equivalent to cellulose III{sub I}, and another with two independent glucosyl conformations in the asymmetric unit. Both X-ray crystallographic and {sup 13}C NMR spectroscopic results are consistent with an aggregated microdomain structure for cellulose III{sub II}. This structure can be generated from a new crystal form (space group P2{sub 1}; a = 4.45 {angstrom}, b = 14.64 {angstrom}, c = 10.36 {angstrom}, {alpha} = {beta} = 90{sup o}, {gamma} = 90.05{sup o}; two crystallographically independent and antiparallel chains; gt hydroxymethyl groups) by multiple dislocation defects. These defects produce microdomains of the new crystal form and cellulose III{sub I} that scanning microprobe diffraction studies show are distributed consistently through the cellulose III{sub II} fiber.

Wada, Masahisa; Heux, Laurent; Nishiyama, Yoshiharu; Langan, Paul; (U of Tokyo); (CNRS-CRMD); (LANL)

2009-03-16T23:59:59.000Z

53

Psychophysical magic: rendering the visible `invisible'  

E-Print Network [OSTI]

Psychophysical magic: rendering the visible `invisible' Chai-Youn Kim and Randolph Blake Department neural states, we must find ways to render an otherwise visible stimulus invisible. In this article, we

Blake, Randolph

54

A 3% Measurement of the Beam Normal Single Spin Asymmetry in Forward Angle Elastic Electron-Proton Scattering using the Qweak Setup  

SciTech Connect (OSTI)

The beam normal single spin asymmetry generated in the scattering of transversely polarized electrons from unpolarized nucleons is an observable of the imaginary part of the two-photon exchange process. Moreover, it is a potential source of false asymmetry in parity violating electron scattering experiments. The Q{sub weak} experiment uses parity violating electron scattering to make a direct measurement of the weak charge of the proton. The targeted 4% measurement of the weak charge of the proton probes for parity violating new physics beyond the Standard Model. The beam normal single spin asymmetry at Q{sub weak} kinematics is at least three orders of magnitude larger than 5 ppb precision of the parity violating asymmetry. To better understand this parity conserving background, the Q{sub weak} Collaboration has performed elastic scattering measurements with fully transversely polarized electron beam on the proton and aluminum. This dissertation presents the analysis of the 3% measurement (1.3% statistical and 2.6% systematic) of beam normal single spin asymmetry in electronproton scattering at a Q2 of 0.025 (GeV/c)2. It is the most precise existing measurement of beam normal single spin asymmetry available at the time. A measurement of this precision helps to improve the theoretical models on beam normal single spin asymmetry and thereby our understanding of the doubly virtual Compton scattering process.

Waidyawansa, Dinayadura Buddhini [OHIO U.

2013-08-01T23:59:59.000Z

55

Spin dynamics and spin counting in the 13C CP/MAS analysis of Argonne Premium coals  

Science Journals Connector (OSTI)

The carbonyl-labelled compound, [3.2.1]bicyclo-4-pyrrolidino-N-methyl-octan-8-one triflate (13CO-123), has been used as an intensity standard for quantitative 13C cross-polarization magic angle spinning (CP/MAS) nuclear magnetic resonance (n.m.r.) analysis (including spin counting) of Argonne Premium coals. The cross-polarization time constants, TCH, and the rotating-frame proton spin-lattice relaxation times, T1?H, have been determined for each major 13C peak of each coal via a combination of variable contact-time and variable spin-lock experiments. Two or three components of rotating-frame 1H relaxation decay and two or three components of TCH behaviour have been observed for each major 13C peak of each coal. These data have been used to determine the number of carbon atoms detected in each coal; these values are in the range 77–87% of the amount of carbon known to be in each coal from elemental analysis data, except for Pocahontas No. 3, for which only 50% of the carbon was detected.

Antoni Jurkiewicz; Gary E. Maciel

1994-01-01T23:59:59.000Z

56

Magic Reservoir Geothermal Area | Open Energy Information  

Open Energy Info (EERE)

Magic Reservoir Geothermal Area Magic Reservoir Geothermal Area Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Geothermal Resource Area: Magic Reservoir Geothermal Area Contents 1 Area Overview 2 History and Infrastructure 3 Regulatory and Environmental Issues 4 Exploration History 5 Well Field Description 6 Geology of the Area 7 Geofluid Geochemistry 8 NEPA-Related Analyses (0) 9 Exploration Activities (0) 10 References Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"TERRAIN","zoom":6,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"500px","height":"300px","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":43.32833333,"lon":-114.3983333,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

57

Los Alamos scientists monitor Santa's magical journey  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Scientists monitor Santa's magical journey Scientists monitor Santa's magical journey Los Alamos scientists monitor Santa's magical journey Los Alamos trackers will use state-of-the-art technology to mark the course taken by St. Nick and his eight tiny and highly efficient reindeer. December 21, 2011 Los Alamos National Laboratory sits on top of a once-remote mesa in northern New Mexico with the Jemez mountains as a backdrop to research and innovation covering multi-disciplines from bioscience, sustainable energy sources, to plasma physics and new materials. Los Alamos National Laboratory sits on top of a once-remote mesa in northern New Mexico with the Jemez mountains as a backdrop to research and innovation covering multi-disciplines from bioscience, sustainable energy sources, to plasma physics and new materials.

58

Magic State Distillation and Gate Compilation in Quantum Algorithms for Quantum Chemistry  

E-Print Network [OSTI]

Quantum algorithms for quantum chemistry map the dynamics of electrons in a molecule to the dynamics of a coupled spin system. To reach chemical accuracy for interesting molecules, a large number of quantum gates must be applied which implies the need for quantum error correction and fault-tolerant quantum computation. Arbitrary fault-tolerant operations can be constructed from a small, universal set of fault-tolerant operations by gate compilation. Quantum chemistry algorithms are compiled by decomposing the dynamics of the coupled spin-system using a Trotter formula, synthesizing the decomposed dynamics using Clifford operations and single-qubit rotations, and finally approximating the single-qubit rotations by a sequence of fault-tolerant single-qubit gates. Certain fault-tolerant gates rely on the preparation of specific single-qubit states referred to as magic states. As a result, gate compilation and magic state distillation are critical for solving quantum chemistry problems on a quantum computer. We review recent progress that has improved the efficiency of gate compilation and magic state distillation by orders of magnitude.

Colin J. Trout; Kenneth R. Brown

2015-01-07T23:59:59.000Z

59

REACTION OF PHOSPHATE COMPOUNDS WITH A HIGH-SILICA ALLOPHANE  

Science Journals Connector (OSTI)

...loading. The 29Si magic angle spinning nuclear magnetic resonance (MAS NMR) spectra...mum) using a Na hexametaphosphate dispersant. The elutriated sample was dried...sup> Si magic angle spinning nuclear magnetic resonance (MAS NMR) spectra...

Kiyoshi Okada; Koji Nishimuta; Yoshikazu Kameshima; Akira Nakajima; Kenneth J. D. MacKenzie

60

Magic Valley Electric Cooperative - ENERGY STAR Builders Program (Texas) |  

Broader source: Energy.gov (indexed) [DOE]

Magic Valley Electric Cooperative - ENERGY STAR Builders Program Magic Valley Electric Cooperative - ENERGY STAR Builders Program (Texas) Magic Valley Electric Cooperative - ENERGY STAR Builders Program (Texas) < Back Eligibility Construction Savings Category Heating & Cooling Home Weatherization Construction Commercial Weatherization Commercial Heating & Cooling Design & Remodeling Appliances & Electronics Water Heating Program Info State Texas Program Type Utility Rebate Program Rebate Amount ENERGY STAR Home: $150-$600 ENERGY STAR Home with Version 3.0 Checklist: $200 Marathon Water Heater Installation: $150 ENERGY STAR Heat Pump Water Heater: $250 Provider Magic Valley Electric Cooperative Magic Valley Electric Cooperative's (MVEC) ENERGY STAR Builders Program offers a variety of incentives to builders of energy efficiency homes

Note: This page contains sample records for the topic "magic angle spinning" 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

2 n -SEMA -a robust solid state nuclear magnetic resonance experiment for measuring heteronuclear dipolar couplings in static oriented systems using effective transverse spin-lock  

Science Journals Connector (OSTI)

Separated local field (SLF) spectroscopy is a powerful technique to measure heteronuclear dipolar couplings. The method provides site-specific dipolar couplings for oriented samples such as membrane proteins oriented in lipid bilayers and liquid crystals. A majority of the SLF techniques utilize the well-known Polarization Inversion Spin Exchange at Magic Angle (PISEMA) pulse scheme which employs spin exchange at the magic angle under Hartmann–Hahn match. Though PISEMA provides a relatively large scaling factor for the heteronuclear dipolar coupling and a better resolution along the dipolar dimension it has a few shortcomings. One of the major problems with PISEMA is that the sequence is very much sensitive to proton carrier offset and the measured dipolar coupling changes dramatically with the change in the carrier frequency. The study presented here focuses on modified PISEMA sequences which are relatively insensitive to proton offsets over a large range. In the proposed sequences the proton magnetization is cycled through two quadrants while the effective field is cycled through either two or four quadrants. The modified sequences have been named as 2 n -SEMA where n represents the number of quadrants the effective field is cycled through. Experiments carried out on a liquid crystal and a single crystal of a model peptide demonstrate the usefulness of the modified sequences. A systematic study under various offsets and Hartmann–Hahn mismatch conditions has been carried out and the performance is compared with PISEMA under similar conditions.

S. Jayanthi; K. V. Ramanathan

2010-01-01T23:59:59.000Z

62

The Magic and Mysteries of Water  

E-Print Network [OSTI]

The Magic and Mysteries of Water Speaker: Prof. Geri Richmond University of Oregon Water is ubiquitous in our lives. Covering more than two thirds of this planet, water surfaces provide a unique role in controlling our climate. In our bodies, water is the `canal of life', transporting and passing

Richmond, Geraldine L.

63

E-Print Network 3.0 - accelerating electromagnetic magic Sample...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

accelerating electromagnetic magic Page: << < 1 2 3 4 5 > >> 1 Very High Energy Gamma Ray Observations with the MAGIC Summary: Very High Energy Gamma Ray Observations with the...

64

Magic Wind LLC | Open Energy Information  

Open Energy Info (EERE)

Wind, LLC Wind, LLC Place Buhl, Idaho Zip 83316 Sector Wind energy Product A small Idaho-based limited liability company developing the proposed 20MW Magic Wind project. Coordinates 47.489797°, -92.772449° 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":47.489797,"lon":-92.772449,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

65

MAGIC: Marine ARM GPCI Investigation of Clouds  

SciTech Connect (OSTI)

The second Atmospheric Radiation Measurement (ARM) Mobile Facility (AMF2) will be deployed aboard the Horizon Lines cargo container ship merchant vessel (M/V) Spirit for MAGIC, the Marine ARM GPCI1 Investigation of Clouds. The Spirit will traverse the route between Los Angeles, California, and Honolulu, Hawaii, from October 2012 through September 2013 (except for a few months in the middle of this time period when the ship will be in dry dock). During this field campaign, AMF2 will observe and characterize the properties of clouds and precipitation, aerosols, and atmospheric radiation; standard meteorological and oceanographic variables; and atmospheric structure. There will also be two intensive observational periods (IOPs), one in January 2013 and one in July 2013, during which more detailed measurements of the atmospheric structure will be made.

Lewis, ER; Wiscombe, WJ; Albrecht, BA; Bland, GL; Flagg, CN; Klein, SA; Kollias, P; Mace, G; Reynolds, RM; Schwartz, SE; Siebesma, AP; Teixeira, J; Wood, R; Zhang, M

2012-10-03T23:59:59.000Z

66

Multilevel distillation of magic states for quantum computing  

E-Print Network [OSTI]

We develop a procedure for distilling magic states used in universal quantum computing that requires substantially fewer initial resources than prior schemes. Our distillation circuit is based on a family of concatenated quantum codes that possess a transversal Hadamard operation, enabling each of these codes to distill the eigenstate of the Hadamard operator. A crucial result of this design is that low-fidelity magic states can be consumed to purify other high-fidelity magic states to even higher fidelity, which we call "multilevel distillation." When distilling in the asymptotic regime of infidelity $\\epsilon \\rightarrow 0$ for each input magic state, the number of input magic states consumed on average to yield an output state with infidelity $O(\\epsilon^{2^r})$ approaches $2^r+1$, which comes close to saturating the conjectured bound in [Phys. Rev. A 86, 052329]. We show numerically that there exist multilevel protocols such that the average number of magic states consumed to distill from error rate $\\epsilon_{\\mathrm{in}} = 0.01$ to $\\epsilon_{\\mathrm{out}}$ in the range $10^{-5}$ to $10^{-40}$ is about $14\\log_{10}(1/\\epsilon_{\\mathrm{out}}) - 40$; the efficiency of multilevel distillation dominates all other reported protocols when distilling Hadamard magic states from initial infidelity 0.01 to any final infidelity below $10^{-7}$. These methods are an important advance for magic-state distillation circuits in high-performance quantum computing, and they provide insight into the limitations of nearly resource-optimal quantum error correction.

Cody Jones

2012-10-11T23:59:59.000Z

67

Investigation of Polyethylene by Means of Magic Angle Turning and Separated-Local-Field Experiments  

Science Journals Connector (OSTI)

2D Separated-Local-Field (SLF) Experiments. ... The pulse sequences for the 2D separated-local-field (SLF) experiment and its saturation?recovery (SR) and saturation?recovery + dipolar dephasing (SRD) variations are given in Figure 4. ... Figure 4 Pulse sequences for the 2D separated-local-field (SLF) experiments. ...

Jian Zhi Hu; Wei Wang; Shi Bai; R. J. Pugmire; Craig M. V. Taylor; D. M. Grant

2000-05-02T23:59:59.000Z

68

E-Print Network 3.0 - angle meningioma presenting Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Summary: angle spinning HSVD Hankel singular value decomposition 12 HTLS Hankel total least squares 295 HTLS... FreS Metropolis frequency-selective 230 MEN...

69

Day 1 -September 10 Green Event and `Starling magic'  

E-Print Network [OSTI]

Day 1 - September 10 Green Event and `Starling magic' 12:00 ­ 18:30 Welcome and check Venue: Fællessalen, Christiansborg Palace, Rigs- dagsgården 08:00 Registration and coffee/tea 09 and Sweden Lari Pitkä-Kangas, Deputy Mayor, Urban Ecology (Green Party) City of Malmö, Sweden 09:40 Children

Edinburgh, University of

70

MAGIC: Marine ARM GPCI Investigations of Clouds Principal Investigators  

E-Print Network [OSTI]

MAGIC: Marine ARM GPCI Investigations of Clouds Principal Investigators Ernie R. Lewis (Brookhaven, The Netherlands) Joao Teixeira (Jet Propulsion Laboratory, California Institute of Technology) Robert Wood (University of Washington) Minghua Zhang (Stony Brook University) #12;Why, When, and Where? Low marine

Ohta, Shigemi

71

Structure of RheniumContaining Sodium Borosilicate Glass  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

ionic size, and redox. Magic angle spinning nuclear magnetic resonance, Fourier transform infrared spectroscopy, and Raman spectroscopy were performed to characterize the...

72

Magicity of the $^{52}$Ca and $^{54}$Ca isotopes and tensor contribution within a mean--field approach  

E-Print Network [OSTI]

We investigate the magicity of the isotopes $^{52}$Ca and $^{54}$Ca, that was recently confirmed by two experimental measurements, and relate it to like--particle and neutron--proton tensor effects within a mean--field description. By analyzing Ca isotopes, we show that the like--particle tensor contribution induces shell effects that render these nuclei more magic than they would be predicted by neglecting it. In particular, such induced shell effects are stronger in the nucleus $^{52}$Ca and the single--particle gaps are increased in both isotopes due to the tensor force. By studying $N=32$ and $N=34$ isotones, neutron--proton tensor effects may be isolated and their role analyzed. It is shown that neutron--proton tensor effects lead to increasing $N=32$ and $N=34$ gaps, when going along isotonic chains, from $^{58}$Fe to $^{52}$Ca, and from $^{60}$Fe to $^{54}$Ca, respectively. The mean--field calculations are perfomed by employing one Skyrme parameter set, that was introduced in a previous work by fitting the tensor parameters together with the spin--orbit strength. The signs and the values of the tensor strengths are thus checked within this specific application. The obtained results indicate that the employed parameter set, even if generated with a partial adjustment of the parameters of the force, leads to the correct shell behavior and provides, in particular, a description of the magicity of $^{52}$Ca and $^{54}$Ca within a pure mean--field picture with the effective two--body Skyrme interaction.

Marcella Grasso

2014-03-03T23:59:59.000Z

73

Effects of the tensor force on the ground and first $2^{+}$ states of the magic $^{54}$Ca nucleus  

E-Print Network [OSTI]

The magic nature of the $^{54}$Ca nucleus is investigated in the light of the recent experimental results. We employ both HFB and HF+BCS methods using Skyrme-type SLy5, SLy5+T and T44 interactions. The evolution of the single-particle spectra is studied for the N=34 isotones: $^{60}$Fe, $^{58}$Cr, $^{56}$Ti and $^{54}$Ca. An increase is obtained in the neutron spin-orbit splittings of $p$ and $f$ states due to the effect of the tensor force which also makes $^{54}$Ca a magic nucleus candidate. QRPA calculations on top of HF+BCS are performed to investigate the first $J^{\\pi}$=$2^{+}$ states of the calcium isotopic chain. A good agreement for excitation energies is obtained when we include the tensor force in the mean-field part of the calculations. The first $2^{+}$ states indicate a subshell closure for both $^{52}$Ca and $^{54}$Ca nuclei. We confirm that the tensor part of the interaction is quite essential in explaining the neutron subshell closure in $^{52}$Ca and $^{54}$Ca nuclei.

E. Yüksel; N. Van Giai; E. Khan; K. Bozkurt

2014-04-02T23:59:59.000Z

74

Magical Seals, Secure Voting Machines, and Other Fantasies  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Magical Seals, Magical Seals, Secure Voting Machines, and Other Fantasies Roger G. Johnston, Ph.D., CPP Jon S. Warner, Ph.D. Vulnerability Assessment Team! Argonne National Laboratory! ! ! 630-252-6168 rogerj@anl.gov http://www.ne.anl.gov/capabilities/vat! Invited Talk for the Election Verification Network Meeting, Chicago, March 24-26, 2011 Argonne National Laboratory ~$738 million annual budget 1500 acres, 3400 employees, 4400 facility users, 1500 students R&D and technical assistance for government & industry Sponsors * DHS * DoD * DOS * IAEA * Euratom * DOE/NNSA * private companies * intelligence agencies * public interest organizations The VAT has done detailed vulnerability assessments on hundreds of different security

75

"Magic" radio-frequency dressing for trapped atomic microwave clocks  

E-Print Network [OSTI]

It has been proposed to use magnetically trapped atomic ensembles to enhance the interrogation time in microwave clocks. To mitigate the perturbing effects of the magnetic trap, "near-magic field" configurations are employed, where the involved clock transition becomes independent of the atoms potential energy to first order. Still, higher order effects are a dominating source for dephasing, limiting the perfomance of this approach. Here we propose a simple method to cancel the energy dependence to both, first and second order, using weak radio-frequency dressing. We give values for dressing frequencies, amplitudes, and trapping fields for 87Rb atoms and investigate quantitatively the robustness of these "second-order magic" conditions to variations of the system parameters. We conclude that radio-frequency dressing can suppress field-induced dephasing by at least one order of magnitude for typical experimental parameters.

Kazakov, Georgy A

2014-01-01T23:59:59.000Z

76

Magic-state distillation with the four-qubit code  

E-Print Network [OSTI]

The distillation of magic states is an often-cited technique for enabling universal quantum computing once the error probability for a special subset of gates has been made negligible by other means. We present a routine for magic-state distillation that reduces the required overhead for a range of parameters of practical interest. Each iteration of the routine uses a four-qubit error-detecting code to distill the +1 eigenstate of the Hadamard gate at a cost of ten input states per two improved output states. Use of this routine in combination with the 15-to-1 distillation routine described by Bravyi and Kitaev allows for further improvements in overhead.

Meier, Adam M; Knill, Emanuel

2012-01-01T23:59:59.000Z

77

Magic-state distillation with the four-qubit code  

E-Print Network [OSTI]

The distillation of magic states is an often-cited technique for enabling universal quantum computing once the error probability for a special subset of gates has been made negligible by other means. We present a routine for magic-state distillation that reduces the required overhead for a range of parameters of practical interest. Each iteration of the routine uses a four-qubit error-detecting code to distill the +1 eigenstate of the Hadamard gate at a cost of ten input states per two improved output states. Use of this routine in combination with the 15-to-1 distillation routine described by Bravyi and Kitaev allows for further improvements in overhead.

Adam M. Meier; Bryan Eastin; Emanuel Knill

2012-04-18T23:59:59.000Z

78

Expression of Magic-F1 to induce myogenesis in C2C12 myogenic cells and embryonic stem cells.  

E-Print Network [OSTI]

??Magic-F1 is a recombinant protein derived from the human hepatocyte growth factor (HGF). Differently from HGF, Magic-F1 enhances the myogenic differentiation process. To evaluate the… (more)

ELIA, ILARIA

2012-01-01T23:59:59.000Z

79

Nest graphs and minimal complete symmetry groups for magic Sudoku variants  

E-Print Network [OSTI]

, already minimal and complete. 2 Modular-magic Sudoku A Sudoku board is a 9 grid with nine 3 Ã? 3 designated blocks. We call the rows, columns and diagonals of these blocks mini-rows, mini-columns and mini block is a magic square modulo 9, in the sense that the entries of every mini-row, mini-column and mini

Lorch, John D.

80

On the road to doubly-magic {sup 48}Ni  

SciTech Connect (OSTI)

A relativistic primary beam of {sup 58}Ni from the SIS synchrotron at GSI was used to produce proton-rich isotopes in the titanium-to-nickel region by projectile fragmention at the FRS. We report here on the first observation of the T{sub z}=-7/2 nuclei {sup 45}Fe and {sup 49}Ni. In addition, the new isotope {sup 42}Cr (T{sub z}=-3) was identified. This opens the route to the yet unobserved doubly-magic nucleus {sup 48}Ni.

Blank, B.; Czajkowski, S.; Davi, F.; Del Moral, R.; Dufour, J. P.; Fleury, A.; Marchand, C.; Pravikoff, M. S. [Centre d'Etudes Nucleaires de Bordeaux-Gradignan, F-33175 Gradignan Cedex (France); Benlliure, J.; Boue, F.; Collatz, R.; Heinz, A.; Hellstroem, M.; Hu, Z.; Roeckl, E.; Shibata, M.; Suemmerer, K. [Gesellschaft fuer Schwerionenforschung, Planckstr. 1, D-64291 Darmstadt (Germany); Lewitowicz, M. [Grand Accelerateur National des Ions Lourds, B.P. 5027, F-14021 Caen Cedex (France); Janas, Z.; Karny, M. [Institute of Experimental Physics, University of Warsaw, PL-00-681 Warsaw, Hoza 69 (Poland)] (and others)

1998-12-21T23:59:59.000Z

Note: This page contains sample records for the topic "magic angle spinning" 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.


81

The MAGIC of SSC and how it affects LHC  

E-Print Network [OSTI]

We discuss the phenomenology of Supercritical String Cosmology (SSC) in the context of Dark Matter constraints on supersymmetric particle physics models at LHC. We also link our results with recent findings of the MAGIC, H.E.S.S. and Fermi Telescopes on delayed arrival of highly energetic photons from the distant Galaxies and GRBs. The link is provided by a concrete model of space-time foam in (supercritical) string theory, involving space-time defects and their interaction with matter in a brane world scenario.

Nick E. Mavromatos; D. V. Nanopoulos

2009-02-09T23:59:59.000Z

82

Leaching of boron from coal ash  

Science Journals Connector (OSTI)

Leaching of boron from coal ash ... First High-Resolution 11B Nuclear Magnetic Resonance (NMR) Spectra of Coal Fly Ash by Satellite-Transition Magic Angle Spinning (STMAS) NMR ... First High-Resolution 11B Nuclear Magnetic Resonance (NMR) Spectra of Coal Fly Ash by Satellite-Transition Magic Angle Spinning (STMAS) NMR ...

James A. Cox; Gary L. Lundquist; Andrzej Przyjazny; C. David Schmulbach

1978-06-01T23:59:59.000Z

83

Spin transport and spin polarization properties in double-stranded DNA  

SciTech Connect (OSTI)

We study the spin-dependent electron transport through a double-stranded DNA (dsDNA) using the Bogoliubov-de Gennes equations and non-equilibrium Green's function method. We calculate the spin-dependent electron conductance and spin-polarization for different lengths, helix angles, twist angles of dsDNA, the environment-induced dephasing factors, and hopping integral. It is shown that the conductance decreases by increasing the length and dephasing factor. Also, we show that the spin-polarization depends on the helical symmetry and the length of DNA. It is shown that the double-stranded DNA can act as a perfect spin filter. Finally, we show that the sign of spin polarization can be inverted from +1 (?1) to ?1 (+1) for some values of hopping integral.

Simchi, Hamidreza, E-mail: simchi@iust.ac.ir [Department of Physics, Iran University of Science and Technology, Narrmak, Tehran 16844 (Iran, Islamic Republic of); Semiconductor Technology Center, Tehran (Iran, Islamic Republic of); Esmaeilzadeh, Mahdi, E-mail: mahdi@iust.ac.ir; Mazidabadi, Hossein [Department of Physics, Iran University of Science and Technology, Narrmak, Tehran 16844 (Iran, Islamic Republic of)

2013-11-21T23:59:59.000Z

84

Catalysis and activation of magic states in fault-tolerant architectures  

SciTech Connect (OSTI)

In many architectures for fault-tolerant quantum computing universality is achieved by a combination of Clifford group unitary operators and preparation of suitable nonstabilizer states, the so-called magic states. Universality is possible even for some fairly noisy nonstabilizer states, as distillation can convert many noisy copies into fewer purer magic states. Here we propose protocols that exploit multiple species of magic states in surprising ways. These protocols provide examples of previously unobserved phenomena that are analogous to catalysis and activation well known in entanglement theory.

Campbell, Earl T. [Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT (United Kingdom) and Institute of Physics and Astronomy, University of Potsdam, D-14476 Potsdam (Germany)

2011-03-15T23:59:59.000Z

85

Magic Valley Electric Coop Inc | Open Energy Information  

Open Energy Info (EERE)

Valley Electric Coop Inc Valley Electric Coop Inc Jump to: navigation, search Name Magic Valley Electric Coop Inc Place Texas Utility Id 11501 Utility Location Yes Ownership C NERC Location TRE NERC ERCOT Yes ISO Ercot Yes Activity Distribution Yes References EIA Form EIA-861 Final Data File for 2010 - File1_a[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Utility Rate Schedules Grid-background.png Commercial Area 100 W HPS Lighting Commercial Area 150 W HPS Lighting Commercial Area 175 W MV Lighting Commercial Area 250 W HPS Lighting Commercial Area 400 W HPS Lighting Commercial Area 400 W MV Lighting Commercial Flood 1000 W HPS Lighting Commercial Flood 1000 W MH Lighting Commercial Flood 250 W HPS Lighting

86

On Zero-Sum \\({\\mathbb{Z}_k}\\) -Magic Labelings of 3-Regular Graphs  

Science Journals Connector (OSTI)

Let G =  (V, E) be a finite loopless graph and let (A, +) be an abelian group with identity 0. Then an A-magic labeling of G is a function ...

Jeong-Ok Choi; J. P. Georges; David Mauro

2013-05-01T23:59:59.000Z

87

MAGIC A YEAR-LONG INVESTIGATION OF MARINE CLOUDS IN THE PACIFIC  

E-Print Network [OSTI]

MAGIC ­ A YEAR-LONG INVESTIGATION OF MARINE CLOUDS IN THE PACIFIC Ernie R. Lewis1 , Warren J of the Netherlands (KMNI), The Netherlands; 10 NASA Jet Propulsion Laboratory, Pasadena, CA; 11 University

Homes, Christopher C.

88

Treatment of 30 simple obesity patients with eight magic turtle techniques  

Science Journals Connector (OSTI)

The points, Neiguan (PC 6)-Gongsun (SP 4), Houxi (SI 3)-Shenmai (BL 62), Lieque (LU 7)-Zhaohai (KI 6), or Waiguan (TE 5)-Zulinqi (GB 41), were selected according to the eight magic turtle techniques and some acup...

Piao Lian-you; Zhang Xue-li; Liu Ying

2004-04-01T23:59:59.000Z

89

Aqueous Synthesis of Zinc Blende CdTe/CdS Magic-Core/Thick-Shell...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

CdTeCdS Magic-CoreThick-Shell Tetrahedral Shaped Nanocrystals with Emission Tunable to Near-Infrared Authors: Deng, Z., Schulz, O., Lin, S., Ding, B., Liu, X., Wei, X., Ros, R.,...

90

500 MHz NMR Shasta (Solids) | EMSL  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

self-directed operations. Collaborative work with staff scientists is encouraged. Solid-state Magic Angle Spinning (MAS) probes: 4-mm Agilent HXY MAS probe Spinning up to 18 kHz...

91

A Review of "Rhetoric, Science, and Magic in Seventeenth-Century England" by Ryan J. Stark  

E-Print Network [OSTI]

, madison. In Rhetoric, Science, and Magic in Seventeenth-Century England, Ryan J. Stark recasts the Restoration shift toward an ideal of rhetorical plain- ness as an ontological, rather than a syntactical, event. Scholars since R. F. Jones have identified... of words from things in an anxiety about the influence of diabolical rhetoric, an influence detected in the discourses of zealous religion and nefarious magic. Denying the users of enchanted language their ontological claim to power, experimentalist...

Cedillo Tootalian, Jacob A.

2010-01-01T23:59:59.000Z

92

Measures on Mixing Angles  

E-Print Network [OSTI]

We address the problem of the apparently very small magnitude of CP violation in the standard model, measured by the Jarlskog invariant J. In order to make statements about probabilities for certain values of J, we seek to find a natural measure on the space of Kobayashi-Maskawa matrices, the double quotient U(1)^2\\SU(3)/U(1)^2. We review several possible, geometrically motivated choices of the measure, and compute expectation values for powers of J for these measures. We find that different choices of the measure generically make the observed magnitude of CP violation appear finely tuned. Since the quark masses and the mixing angles are determined by the same set of Yukawa couplings, we then do a second calculation in which we take the known quark mass hierarchy into account. We construct the simplest measure on the space of 3 x 3 Hermitian matrices which reproduces this known hierarchy. Calculating expectation values for powers of J in this second approach, we find that values of J close to the observed value are now rather likely, and there does not seem to be any fine tuning. Our results suggest that the choice of Kobayashi-Maskawa angles is closely linked to the observed mass hierarchy. We close by discussing the corresponding case of neutrinos.

Gary W. Gibbons; Steffen Gielen; C. N. Pope; Neil Turok

2008-10-27T23:59:59.000Z

93

Widespread spin polarization effects in photoemission from topological insulators  

SciTech Connect (OSTI)

High-resolution spin- and angle-resolved photoemission spectroscopy (spin-ARPES) was performed on the three-dimensional topological insulator Bi{sub 2}Se{sub 3} using a recently developed high-efficiency spectrometer. The topological surface state's helical spin structure is observed, in agreement with theoretical prediction. Spin textures of both chiralities, at energies above and below the Dirac point, are observed, and the spin structure is found to persist at room temperature. The measurements reveal additional unexpected spin polarization effects, which also originate from the spin-orbit interaction, but are well differentiated from topological physics by contrasting momentum and photon energy and polarization dependencies. These observations demonstrate significant deviations of photoelectron and quasiparticle spin polarizations. Our findings illustrate the inherent complexity of spin-resolved ARPES and demonstrate key considerations for interpreting experimental results.

Jozwiak, C.; Chen, Y. L.; Fedorov, A. V.; Analytis, J. G.; Rotundu, C. R.; Schmid, A. K.; Denlinger, J. D.; Chuang, Y.-D.; Lee, D.-H.; Fisher, I. R.; Birgeneau, R. J.; Shen, Z.-X.; Hussain, Z.; Lanzara, A.

2011-06-22T23:59:59.000Z

94

A New Spin on Photoemission Spectroscopy  

SciTech Connect (OSTI)

The electronic spin degree of freedom is of general fundamental importance to all matter. Understanding its complex roles and behavior in the solid state, particularly in highly correlated and magnetic materials, has grown increasingly desirable as technology demands advanced devices and materials based on ever stricter comprehension and control of the electron spin. However, direct and efficient spin dependent probes of electronic structure are currently lacking. Angle Resolved Photoemission Spectroscopy (ARPES) has become one of the most successful experimental tools for elucidating solid state electronic structures, bolstered bycontinual breakthroughs in efficient instrumentation. In contrast, spin-resolved photoemission spectroscopy has lagged behind due to a lack of similar instrumental advances. The power of photoemission spectroscopy and the pertinence of electronic spin in the current research climate combine to make breakthroughs in Spin and Angle Resolved Photoemission Spectroscopy (SARPES) a high priority . This thesis details the development of a unique instrument for efficient SARPES and represents a radical departure from conventional methods. A custom designed spin polarimeter based on low energy exchange scattering is developed, with projected efficiency gains of two orders of magnitude over current state-of-the-art polarimeters. For energy analysis, the popular hemispherical analyzer is eschewed for a custom Time-of-Flight (TOF) analyzer offering an additional order of magnitude gain in efficiency. The combined instrument signifies the breakthrough needed to perform the high resolution SARPES experiments necessary for untangling the complex spin-dependent electronic structures central to today?s condensed matter physics.

Advanced Light Source; Jozwiak, Chris

2008-12-18T23:59:59.000Z

95

Nuclear spin circular dichroism  

SciTech Connect (OSTI)

Recent years have witnessed a growing interest in magneto-optic spectroscopy techniques that use nuclear magnetization as the source of the magnetic field. Here we present a formulation of magnetic circular dichroism (CD) due to magnetically polarized nuclei, nuclear spin-induced CD (NSCD), in molecules. The NSCD ellipticity and nuclear spin-induced optical rotation (NSOR) angle correspond to the real and imaginary parts, respectively, of (complex) quadratic response functions involving the dynamic second-order interaction of the electron system with the linearly polarized light beam, as well as the static magnetic hyperfine interaction. Using the complex polarization propagator framework, NSCD and NSOR signals are obtained at frequencies in the vicinity of optical excitations. Hartree-Fock and density-functional theory calculations on relatively small model systems, ethene, benzene, and 1,4-benzoquinone, demonstrate the feasibility of the method for obtaining relatively strong nuclear spin-induced ellipticity and optical rotation signals. Comparison of the proton and carbon-13 signals of ethanol reveals that these resonant phenomena facilitate chemical resolution between non-equivalent nuclei in magneto-optic spectra.

Vaara, Juha, E-mail: juha.vaara@iki.fi [NMR Research Group, Department of Physics, University of Oulu, P.O. Box 3000, FIN-90014 Oulu (Finland)] [NMR Research Group, Department of Physics, University of Oulu, P.O. Box 3000, FIN-90014 Oulu (Finland); Rizzo, Antonio [Istituto per i Processi Chimico-Fisici del Consiglio Nazionale delle Ricerche (IPCF-CNR), Area della Ricerca, via G. Moruzzi 1, I-56124 Pisa (Italy)] [Istituto per i Processi Chimico-Fisici del Consiglio Nazionale delle Ricerche (IPCF-CNR), Area della Ricerca, via G. Moruzzi 1, I-56124 Pisa (Italy); Kauczor, Joanna; Norman, Patrick [Department of Physics, Chemistry and Biology, Linköping University, S-58183 Linköping (Sweden)] [Department of Physics, Chemistry and Biology, Linköping University, S-58183 Linköping (Sweden); Coriani, Sonia, E-mail: coriani@units.it [Dipartimento di Scienze Chimiche e Farmaceutiche, Università degli Studi di Trieste, Via L. Giorgieri 1, I-34127 Trieste (Italy)] [Dipartimento di Scienze Chimiche e Farmaceutiche, Università degli Studi di Trieste, Via L. Giorgieri 1, I-34127 Trieste (Italy)

2014-04-07T23:59:59.000Z

96

Thermodynamics of multiferroic spin chains  

Science Journals Connector (OSTI)

The minimal model to describe many spin-chain materials with ferroelectric properties is the Heisenberg model with ferromagnetic nearest-neighbor coupling J1 and antiferromagnetic next-nearest-neighbor coupling J2. Here we study the thermodynamics of this model using a density-matrix algorithm applied to transfer matrices. We find that the incommensurate spin-spin correlations—crucial for the ferroelectric properties and the analog of the classical spiral pitch angle—depend not only on the ratio J2/|J1| but also strongly on temperature. We study small easy-plane anisotropies which can stabilize a vector chiral order as well as the finite-temperature signatures of multipolar phases, stable at finite magnetic field. Furthermore, we fit the susceptibilities of LiCuVO4, LiCu2O2, and Li2ZrCuO4. Contrary to the literature, we find that for LiCuVO4 the best fit is obtained with J2?90?K and J2/|J1|?0.5 and show that these values are consistent with the observed spin incommensurability. Finally, we discuss our findings concerning the incommensurate spin-spin correlations and multipolar orders in relation to future experiments on these compounds.

J. Sirker

2010-01-26T23:59:59.000Z

97

Discovery of TeV gamma-ray emission from the Pulsar Wind Nebula 3C 58 by MAGIC  

E-Print Network [OSTI]

The Pulsar Wind Nebula (PWN) 3C 58 is energized by one of the highest spin-down power pulsars known (5% of Crab pulsar) and it has been compared to the Crab Nebula due to their morphological similarities. This object was detected by Fermi-LAT with a spectrum extending beyond 100 GeV. We analyzed 81 hours of 3C 58 data taken with the MAGIC telescopes and we detected VHE gamma-ray emission for the first time at TeV energies with a significance of 5.7 sigma and an integral flux of 0.65% C.U. above 1 TeV. The differential energy spectrum between 400 GeV and 10 TeV is well described by a power-law function $d\\Phi/dE=f_{o}(E/1TeV)^{-\\Gamma}$ with $f_{o}=(2.0\\pm0.4stat\\pm0.6sys) 10^{-13}cm^{-2}s^{-1}TeV^{-1}$ and $\\Gamma=2.4\\pm0.2sta\\pm0.2sys$. This leads 3C 58 to be the least luminous PWN ever detected at VHE and the one with the lowest flux at VHE to date. According to time-dependent models in which electrons up-scatter photon fields, the best representation favors a distance to the PWN of 2 kpc and FIR comparable...

Bigas, O Blanch; Carmona, E; Pérez-Torres, M A

2015-01-01T23:59:59.000Z

98

Spin Stability  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Stability Stability of Asymmetrically Charged Plasma Dust I. H. Hutchinson Plasma Science and Fusion Center Massachusetts Institute of Technology, Cambridge, MA, USA Recently it has been reported that, under some circumstances, dust particles sus- pended in the sheath edge are observed to spin [1, 2, 3]. The present paper shows that there is a natural electrostatic mechanism that should cause even perfectly spherical par- ticles in a perfectly irrotational, magnetic-field-free flowing plasma to spin. The stability criterion and the final spin state are obtained[4]. When the particle is made of an insulating material, it can support potential dif- ferences around its surface. In the limit of zero conductivity, and ignoring all charging effects other than electron or ion collection, the surface charge density accumulates in such a way as to bring the local electric current density to zero.

99

Geek-Up[09.24.10] -- Magical BEANs, Combating Bacteria's Resistance to  

Broader source: Energy.gov (indexed) [DOE]

9.24.10] -- Magical BEANs, Combating Bacteria's Resistance 9.24.10] -- Magical BEANs, Combating Bacteria's Resistance to Antibiotics and the ChemCam's Journey to Mars Geek-Up[09.24.10] -- Magical BEANs, Combating Bacteria's Resistance to Antibiotics and the ChemCam's Journey to Mars September 24, 2010 - 5:19pm Addthis Check out the ChemCam close-up, which will reveal which elements are present in Mars' rocks and soils. Elizabeth Meckes Elizabeth Meckes Director of User Experience & Digital Technologies, Office of Public Affairs What are the key facts? BEANs -- phase-change materials -- have the ability to readily and swiftly transition between different phases, making them a valuable low-power source of flash memory and data storage. Scientists are studying E. coli bacteria's efflux pump to help them make inhibitors that will stop the heavy-metal pump and the antibiotic

100

Magic state distillation in all prime dimensions using quantum Reed-Muller codes  

E-Print Network [OSTI]

We propose families of protocols for magic state distillation -- important components of fault tolerance schemes --- for systems of odd prime dimension. Our protocols utilize quantum Reed-Muller codes with transversal non-Clifford gates. We find that in higher dimensions smaller codes can be used than one might expect based on qubit codes. All our protocols produce magic states at a resource cost that increases only polynomially with the inverse of the final ouput error probability. We give specific details for 3-dimensional systems, where we find that certain magic states can be distilled provided an initial error probability of less than 20.02% or a depolarizing noise rate of less than 31.7%. This is the largest error probability threshold of all known protocols with polynomial resource cost. For a depolarizing noise model we also give distillation thresholds for odd prime dimensions up-to 19.

Campbell, Earl T; Browne, Dan E

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "magic angle spinning" 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

High-Angle Kikuchi Patterns  

Science Journals Connector (OSTI)

...starting near the shadow edge of the pattern; these changed to excess bands at higher angles of scattering. The most striking feature...low intensity and low clarity was found at these angles for lithium fluoride under the same experimental conditions. An investigation...

1954-01-01T23:59:59.000Z

102

The Universe Viewed in Gamma-Rays 1 The Future of the MAGIC Project: Phase II  

E-Print Network [OSTI]

and even become very important. We are trying to quantify the rate of muons which will pass the selection for the MAGIC Collaboration Max-Planck-Institute for Physics, Foehringer Ring 6, 80805 Munich, Germany Abstract will be discussed. 1. Introduction Seven and a half years have passed since the first presentations

Enomoto, Ryoji

103

A Review of "Magic and Masculinity in Early Modern English Drama" by Ian McAdam  

E-Print Network [OSTI]

Adam?s primary and second- ary research is thorough and everywhere evident in the book. He not only makes available to readers a fascinating array of selections from early modern texts discussing magic but draws into his discussion the comments on Renaissance...

Tiffany, Grace

2011-01-01T23:59:59.000Z

104

Creating a stereoscopic magic-lens to improve depth perception in handheld augmented reality  

Science Journals Connector (OSTI)

Handheld Augmented Reality (AR) is often presented using the magic-lens paradigm where the handheld device is portrayed as if it was transparent. Such a virtual transparency is usually implemented using video captured by a single camera rendered on the ... Keywords: binocular disparity, depth perception, handheld, mobile, parallax, stereoscopic rendering, user study, virtual transparency

Klen ?opi? Pucihar; Paul Coulton; Jason Alexander

2013-08-01T23:59:59.000Z

105

MAGIC -MARINE ARM GPCI INVESTIGATION OF CLOUDS E. R. Lewis1  

E-Print Network [OSTI]

MAGIC - MARINE ARM GPCI INVESTIGATION OF CLOUDS E. R. Lewis1 , W. J. Wiscombe2 , B. A. Albrecht3, VA 5. School of Marine and Atmospheric Sciences, Stony Brook University, Stony Brook, NY 6. Lawrence Netherlands Meteorological Institute (KNMI), de Bilt, Netherlands 11. Jet Propulsion Laboratory, Pasadena, CA

Johnson, Peter D.

106

Complex instruction set computing architecture for performing accurate quantum $Z$ rotations with less magic  

E-Print Network [OSTI]

We present quantum protocols for executing arbitrarily accurate $\\pi/2^k$ rotations of a qubit about its $Z$ axis. Reduced instruction set computing (\\textsc{risc}) architectures typically restrict the instruction set to stabilizer operations and a single non-stabilizer operation, such as preparation of a "magic" state from which $T = Z(\\pi/4)$ gates can be teleported. Although the overhead required to distill high-fidelity copies of this magic state is high, the subsequent quantum compiling overhead to realize $Z$ rotations in a \\textsc{risc} architecture can be much greater. We develop a complex instruction set computing (\\textsc{cisc}) architecture whose instruction set includes stabilizer operations and preparation of magic states from which $Z(\\pi/2^k)$ gates can be teleported, for $2 \\leq k \\leq k_{\\text{max}}$. This results in a substantial overall reduction in the number of gates required to achieve a desired gate accuracy for $Z$ rotations. The key to our construction is a family of shortened quantum Reed-Muller codes of length $2^{k+2}-1$, whose magic-state distillation threshold shrinks with $k$ but is greater than 0.85% for $k \\leq 6$.

Andrew J. Landahl; Chris Cesare

2013-10-15T23:59:59.000Z

107

Demand Response Spinning Reserve Demonstration  

E-Print Network [OSTI]

F) Enhanced ACP Date RAA ACP Demand Response – SpinningReserve Demonstration Demand Response – Spinning Reservesupply spinning reserve. Demand Response – Spinning Reserve

2007-01-01T23:59:59.000Z

108

13C NMR Investigation of the Chemical Structures of Coking and Non-Coking Coals in the Original and Reductively Alkylated Solid States  

Science Journals Connector (OSTI)

Chemical structures of four Turkish coals in their original and reductively alkylated forms were investigated in the solid state by13C NMR, using cross polarization and magic-angle spinning. Changes in13C NMR int...

Gaye Erbatur; Oktay Erbatur; Abdullah Coban; Mark F. Davis…

1984-01-01T23:59:59.000Z

109

Tridentate Phosphine Linkers for Immobilized Catalysts: Development and Characterization of Immobilized Rhodium Complexes and Solid-State NMR Studies of Polymers  

E-Print Network [OSTI]

) polymers. 13C CP/MAS (cross polarization with magic angle spinning) NMR and IR spectroscopy reveal that PEEK polymers show no detectable chemical change on the molecular level, while PPS polymers display signs of oxidation of the thioether group...

Guenther, Johannes 1983-

2012-08-16T23:59:59.000Z

110

Methodology and applications of high resolution solid-state NMR to structure determination of proteins  

E-Print Network [OSTI]

A number of methodological developments and applications of solid-state NMR for assignment and high resolution structure determination of microcrystalline proteins and amyloid fibrils are presented. Magic angle spinning ...

Lewandowski, Józef Romuald

2008-01-01T23:59:59.000Z

111

Solid State Separated-Local-Field NMR Spectroscopy on Half-Integer Quadrupolar Nuclei: Principles and Applications  

E-Print Network [OSTI]

and exemplified. The methods extend separated-local-field magic-angle spinning (SLF MAS) NMR techniques that have and dynamics of a variety of boron-containing samples. These experimental SLF schemes were also extended to 3D

Frydman, Lucio

112

Investigation of Mechanical Activation on Li-N-H Systems Using...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Mechanical Activation on Li-N-H Systems Using 6Li Magic Angle Spinning Nuclear Magnetic Resonance at Ultra-High Investigation of Mechanical Activation on Li-N-H Systems Using 6Li...

113

NMR Studies of Heat-Induced Transitions in Structure and Cation...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

in Structure and Cation Binding Environments of a Strontium-Saturated Swelling Mica. Abstract: In this work we combined Al, Si, F, and Na magic-angle spinning (MAS) nuclear...

114

Protein MAS NMR methodology and structural analysis of protein assemblies  

E-Print Network [OSTI]

Methodological developments and applications of solid-state magic-angle spinning nuclear magnetic resonance (MAS NMR) spectroscopy, with particular emphasis on the analysis of protein structure, are described in this thesis. ...

Bayro, Marvin J

2010-01-01T23:59:59.000Z

115

Spin Resolution of Glueballs in 2+1 Dimensional Lattice Gauge Theory  

E-Print Network [OSTI]

Conventional lattice gauge theory assigns the lowest spin compatible with the symmetry channel of a given operator to the state coupling to that operator. Operators on a cubic lattice, however, are only defined on angles of pi/2, hence states with spin equal modulo 4 may overlap significantly. This paper explores a new technique for generating lattice operators that may be placed onto the lattice at angles other than pi/2, thereby resolving this modulo 4 ambiguity. Calculations of the mass of states with spin equal t o 0, 2, and 4 are performed in the positive parity and charge conjugation channe l and compared to the spectrum from previous lattice calculations. These masses compare well for spin 0 and 2, and for spin 4 the mass agrees with a state conv entionally assigned spin 0, raising the possibility of mis-identification of the spin of states coupling to some traditional operators.

Robert W. Johnson

2002-09-03T23:59:59.000Z

116

Negative Quasi-Probability Representation is a Necessary Resource for Magic State Distillation  

E-Print Network [OSTI]

The magic state model of quantum computation gives a recipe for universal quantum computation using perfect Clifford operations and repeat preparations of a noisy ancilla state. It is an open problem to determine which ancilla states enable universal quantum computation in this model. Here we show that for systems of odd dimension a necessary condition for a state to enable universal quantum computation is that it have negative representation in a particular quasi-probability representation which is a discrete analogue to the Wigner function. This condition implies the existence of a large class of bound states for magic state distillation: states which cannot be prepared using Clifford operations but do not enable universal quantum computation. This condition also enables an efficient experimental test for distillability.

Veitch, Victor; Emerson, Joseph

2012-01-01T23:59:59.000Z

117

No magic show: Real-world levitation to inspire better pharmaceuticals |  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Argonne scientist Chris Benmore demonstrates his acoustic levitator, which could help to improve the efficiency and quality of pharmaceutical development. (Photo by Dan Harris) Argonne scientist Chris Benmore demonstrates his acoustic levitator, which could help to improve the efficiency and quality of pharmaceutical development. (Photo by Dan Harris) Argonne scientist Chris Benmore demonstrates his acoustic levitator, which could help to improve the efficiency and quality of pharmaceutical development. (Photo by Dan Harris) No magic show: Real-world levitation to inspire better pharmaceuticals By Jared Sagoff * September 12, 2012 Tweet EmailPrint It's not a magic trick and it's not sleight of hand - scientists really are using levitation to improve the drug development process, eventually yielding more effective pharmaceuticals with fewer side effects. Scientists at the U.S. Department of Energy's (DOE) Argonne National Laboratory have discovered a way to use sound waves to levitate individual

118

The 3-Dimensional q-Deformed Harmonic Oscillator and Magic Numbers of Alkali Metal Clusters  

E-Print Network [OSTI]

Magic numbers predicted by a 3-dimensional q-deformed harmonic oscillator with Uq(3) > SOq(3) symmetry are compared to experimental data for alkali metal clusters, as well as to theoretical predictions of jellium models, Woods--Saxon and wine bottle potentials, and to the classification scheme using the 3n+l pseudo quantum number. The 3-dimensional q-deformed harmonic oscillator correctly predicts all experimentally observed magic numbers up to 1500 (which is the expected limit of validity for theories based on the filling of electronic shells), thus indicating that Uq(3), which is a nonlinear extension of the U(3) symmetry of the spherical (3-dimensional isotropic) harmonic oscillator, is a good candidate for being the symmetry of systems of alkali metal clusters.

Bonatsos, Dennis; Raychev, P P; Roussev, R P; Terziev, P A; Bonatsos, Dennis

1999-01-01T23:59:59.000Z

119

Definition: Angle of incidence | Open Energy Information  

Open Energy Info (EERE)

Angle of incidence Angle of incidence Jump to: navigation, search Dictionary.png Angle of incidence In reference to solar energy systems: the angle a ray of sun makes with a line perpendicular to a surface; for example, a surface directly facing the sun has an angle of incidence of zero, and a surface parallel to the sun (such as a sunrise striking a horizontal rooftop) has an angle of incidence of 90°. Sunlight with an incident angle of 90° tends to be absorbed, while lower angles tend to be reflected.[1][2] View on Wikipedia Wikipedia Definition Angle of incidence is a measure of deviation of something from "straight on", for example: in the approach of a ray to a surface, or the angle at which the wing or horizontal tail of an airplane is installed on the fuselage, measured relative to the axis of the fuselage.

120

Hybrid magic state distillation for universal fault-tolerant quantum computation  

E-Print Network [OSTI]

A set of stabilizer operations augmented by some special initial states known as 'magic states', gives the possibility of universal fault-tolerant quantum computation. However, magic state preparation inevitably involves nonideal operations that introduce noise. The most common method to eliminate the noise is magic state distillation (MSD) by stabilizer operations. Here we propose a hybrid MSD protocol by connecting a four-qubit H-type MSD with a five-qubit T-type MSD, in order to overcome some disadvantages of the previous MSD protocols. The hybrid MSD protocol further integrates distillable ranges of different existing MSD protocols and extends the T-type distillable range to the stabilizer octahedron edges. And it provides considerable improvement in qubit cost for almost all of the distillable range. Moreover, we experimentally demonstrate the four-qubit H-type MSD protocol using nuclear magnetic resonance technology, together with the previous five-qubit MSD experiment, to show the feasibility of the hybrid MSD protocol.

Wenqiang Zheng; Yafei Yu; Jian Pan; Jingfu Zhang; Jun Li; Zhaokai Li; Dieter Suter; Xianyi Zhou; Xinhua Peng; Jiangfeng Du

2014-12-11T23:59:59.000Z

Note: This page contains sample records for the topic "magic angle spinning" 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

MAGIC observations of MWC 656, the only known Be/BH system  

E-Print Network [OSTI]

Context: MWC 656 has recently been established as the first observationally detected high-mass X-ray binary system containing a Be star and a black hole (BH). The system has been associated with a gamma-ray flaring event detected by the AGILE satellite in July 2010. Aims: Our aim is to evaluate if the MWC 656 gamma-ray emission extends to very high energy (VHE > 100 GeV) gamma rays. Methods. We have observed MWC 656 with the MAGIC telescopes for $\\sim$23 hours during two observation periods: between May and June 2012 and June 2013. During the last period, observations were performed contemporaneously with X-ray (XMM-Newton) and optical (STELLA) instruments. Results: We have not detected the MWC 656 binary system at TeV energies with the MAGIC Telescopes in either of the two campaigns carried out. Upper limits (ULs) to the integral flux above 300 GeV have been set, as well as differential ULs at a level of $\\sim$5\\% of the Crab Nebula flux. The results obtained from the MAGIC observations do not support persis...

,

2015-01-01T23:59:59.000Z

122

Contact angles and surface forces  

Science Journals Connector (OSTI)

The modern state of the theory of wetting phenomena is considered with special attention to the approach based on the theory of surface forces. Contribution of the effects of molecular, electrostatic and short-range structural forces to wetting films stability and forming contact angles is discussed. The magnitudes of contact angles may be predicted on the basis of isotherms of disjoining pressure of wetting films that include Hamaker constants, electrical potentials of solid-liquid and liquid-gas interfaces, and experimental constants that characterize the structural forces of hydrophilic repulsion and hydrophobic attraction. The constants seem to be the same as in the case of interaction of colloidal particles. In the framework of the suggested approach, the influence of surfactants on wetting phenomena was considered.

N.V. Churaev

1995-01-01T23:59:59.000Z

123

OPENING ANGLES OF COLLAPSAR JETS  

SciTech Connect (OSTI)

We investigate the jet propagation and breakout from the stellar progenitor for gamma-ray burst (GRB) collapsars by performing two-dimensional relativistic hydrodynamic simulations and analytical modeling. We find that the jet opening angle is given by ?{sub j} ? 1/5?{sub 0} and infer the initial Lorentz factor of the jet at the central engine, ?{sub 0}, is a few for existing observations of ?{sub j}. The jet keeps the Lorentz factor low inside the star by converging cylindrically via collimation shocks under the cocoon pressure and accelerates at jet breakout before the free expansion to a hollow-cone structure. In this new picture, the GRB duration is determined by the sound crossing time of the cocoon, after which the opening angle widens, reducing the apparent luminosity. Some bursts violating the maximum opening angle ?{sub j,{sub max}} ? 1/5 ? 12° imply the existence of a baryon-rich sheath or a long-acting jet. We can explain the slopes in both Amati and Yonetoku spectral relations using an off-centered photosphere model, if we make only one assumption that the total jet luminosity is proportional to the initial Lorentz factor of the jet. We also numerically calibrate the pre-breakout model (Bromberg et al.) for later use.

Mizuta, Akira; Ioka, Kunihito [Theory Center, Institute of Particle and Nuclear Studies, KEK, Tsukuba 305-0801 (Japan)

2013-11-10T23:59:59.000Z

124

RHIC | Spin Physics  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Spin Physics Spin Physics RHIC is the world's only machine capable of colliding high-energy beams of polarized protons, and is a unique tool for exploring the puzzle of the proton's 'missing' spin. In addition to colliding heavy ions, RHIC is able to collide single protons. While these collisions don't produce quark-gluon plasma, they're interesting to physicists for other reasons. Scientists want to know more about a property of particles called 'spin'. Spin is the direction a particle is spinning around an axis as it travels -- just like the Earth spins on its axis as it travels around the sun. Each proton has a specific spin, which helps give it a characteristic magnetic property. spin In this picture of a proton-proton collision, the spin of the particles is shown as arrows circling the spherical particles. The red and green

125

Optically detected coherent spin dynamics of a single electron in a quantum dot  

E-Print Network [OSTI]

dynamics provide a sensitive probe of the local nuclear spin environment. The magneto-optical Kerr effect the sample, analogous to the Faraday effect for transmitted light. For a probe laser energy E, the KR angle,y are momentum operators. For a single conduction band energy level in a QD containing a spin-up electron

Loss, Daniel

126

Studies in Small Angle Scattering Techniques  

E-Print Network [OSTI]

. Knud Møllenbach Abstract. Small angle scattering of neutrons, x-rays and y-rays are found among scattering as well as small angle y-ray diffraction. The study of neutron scat- tering from formations limit of the neutron diffractometer 20 3. SMALL ANGLE SCATTERING INSTRUMENTS 22 3.1. The double crystal

127

ARPES Provides Direct Evidence of Spin-Wave Coupling  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

ARPES Provides Direct Evidence of Spin-Wave Coupling Print ARPES Provides Direct Evidence of Spin-Wave Coupling Print The electronic properties of a metal are determined by the dynamical behavior of its conduction electrons. Conventional band theory accounts for the interaction of the electrons with the static ion lattice. However, coupling to further microscopic degrees of freedom can alter the electron dynamics considerably. For example, "conventional" superconductivity emerges as a result of the electrons' interaction with lattice vibrations (phonons). In magnetic materials, coupling with spin waves (magnons) is also expected. Such interactions may contribute to high-temperature superconductivity in novel materials. Unfortunately, lattice vibrations and spin waves have similar energy scales, hindering detailed study. Researchers have taken a new approach in analyzing the electron bands of ferromagnetic iron. Angle-resolved photoemission spectroscopy (ARPES) provides direct spectroscopic evidence of altered electron mass and energy (quasiparticle formation) in a magnetic solid due to coupling with spin waves.

128

ARPES Provides Direct Evidence of Spin-Wave Coupling  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

ARPES Provides Direct Evidence of Spin-Wave Coupling Print ARPES Provides Direct Evidence of Spin-Wave Coupling Print The electronic properties of a metal are determined by the dynamical behavior of its conduction electrons. Conventional band theory accounts for the interaction of the electrons with the static ion lattice. However, coupling to further microscopic degrees of freedom can alter the electron dynamics considerably. For example, "conventional" superconductivity emerges as a result of the electrons' interaction with lattice vibrations (phonons). In magnetic materials, coupling with spin waves (magnons) is also expected. Such interactions may contribute to high-temperature superconductivity in novel materials. Unfortunately, lattice vibrations and spin waves have similar energy scales, hindering detailed study. Researchers have taken a new approach in analyzing the electron bands of ferromagnetic iron. Angle-resolved photoemission spectroscopy (ARPES) provides direct spectroscopic evidence of altered electron mass and energy (quasiparticle formation) in a magnetic solid due to coupling with spin waves.

129

Tomotherapy dose distribution verification using MAGIC-f polymer gel dosimetry  

SciTech Connect (OSTI)

Purpose: This paper presents the application of MAGIC-f gel in a three-dimensional dose distribution measurement and its ability to accurately measure the dose distribution from a tomotherapy unit. Methods: A prostate intensity-modulated radiation therapy (IMRT) irradiation was simulated in the gel phantom and the treatment was delivered by a TomoTherapy equipment. Dose distribution was evaluated by the R2 distribution measured in magnetic resonance imaging. Results: A high similarity was found by overlapping of isodoses of the dose distribution measured with the gel and expected by the treatment planning system (TPS). Another analysis was done by comparing the relative absorbed dose profiles in the measured and in the expected dose distributions extracted along indicated lines of the volume and the results were also in agreement. The gamma index analysis was also applied to the data and a high pass rate was achieved (88.4% for analysis using 3%/3 mm and of 96.5% using 4%/4 mm). The real three-dimensional analysis compared the dose-volume histograms measured for the planning volumes and expected by the treatment planning, being the results also in good agreement by the overlapping of the curves. Conclusions: These results show that MAGIC-f gel is a promise for tridimensional dose distribution measurements.

Pavoni, J. F.; Pike, T. L.; Snow, J.; DeWerd, L.; Baffa, O. [Departamento de Fisica, Faculdade de Filosofia Ciencias e Letras de Ribeirao Preto-Universidade de Sao Paulo, Av. Bandeirantes, 3900 - CEP 14040-901 - Bairro Monte Alegre - Ribeirao Preto, SP (Brazil); Medical Radiation Research Center, Department of Medical Physics, University of Wisconsin, 1111 Highland Avenue, B1002 WIMR, Madison, Wisconsin 53705-2275 (United States); Departamento de Fisica, Faculdade de Filosofia Ciencias e Letras de Ribeirao Preto-Universidade de Sao Paulo, Av. Bandeirantes, 3900 - CEP 14040-901 - Bairro Monte Alegre - Ribeirao Preto, SP (Brazil)

2012-05-15T23:59:59.000Z

130

Detailed structure of spinning detonation in a circular tube  

SciTech Connect (OSTI)

A single spinning detonation wave propagating in a circular tube, discovered experimentally in 1926, is simulated three-dimensionally with a detailed chemical reaction mechanism. The detonation front obtained numerically rotates periodically with a Mach leg, whiskers, and a transverse detonation. A long pressure trail, which is distributed from the transverse detonation to downstream, was reproduced, clearly showing that the pressure trail also spins synchronously with the transverse detonation. The formation of an unburned gas pocket behind the detonation front was not observed in the present simulations because the rotating transverse detonation completely consumed the unburned gas. The calculated profiles of instantaneous OH mass fraction have a keystone shape behind the detonation front. The numerical results for pitch, track angle, Mach stem angle, and incident shock angle on the tube wall agree well with the experimental results. (author)

Tsuboi, N. [Space Transportation Engineering Department, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Yoshinodai 3-1-1, Sagamihara, Kanagawa 229-8510 (Japan); Eto, K.; Hayashi, A.K. [Department of Mechanical Engineering, Aoyama Gakuin University, Fuchinobe 5-10-1, Sagamihara, Kanagawa 229-8558 (Japan)

2007-04-15T23:59:59.000Z

131

Comparison of MAGIC and Diatom paleolimnological model hindcasts of lakewater acidification in the Adirondack region of New York  

SciTech Connect (OSTI)

Thirty-three lakes that had been statistically selected as part of the US Environmental Protection Agency's Eastern Lake Survey and Direct Delayed Response Project (DDRP) were used to compare the MAGIC (watershed) and Diatom (paleolimnological) models. The study lakes represented a well-defined group of Adirondack lakes, each larger than 4 ha in area and having acid-neutralizing capacity (ANC) <400 {mu}eq L{sup {minus}1}. The study first compared current and pre-industrial (before 1850) pH and ANC estimates from Diatom and MAGIC as they were calibrated in the preceding Paleocological Investigation of Recent Lake Acidification (PIRLA) and DDRP studies, respectively. Initially, the comparison of hindcasts of pre-industrial chemistry was confounded by seasonal and methodological differences in lake chemistry data used in calibration of the model. Although certain differences proved to be of little significance for comparison, MAGIC did predict significantly higher pre-industrial ANC and pH values than did Diatom, using calibrations in the preceding studies. Both models suggest acidification of low ANC Adirondack region lakes since preindustrial times, but differ primarily in that MAGIC inferred greater acidification and that acidification has occurred in all lakes in the comparison, whereas Diatom inferred that acidification has been restricted to low ANC lakes (

Sullivan, T.J.; Bernert, J.A.; Eliers, J.M. (E and S Environmental Chemistry, Corvallis, OR (USA)); Jenne, E.A. (Pacific Northwest Lab., Richland, WA (USA)); Cosby, B.J. (Duke Univ., Durham, NC (USA). School of Forestry and Environmental Studies); Charles, D.F.; Selle, A.R. (Environmental Protection Agency, Corvallis, OR (USA). Environmental Research Lab.)

1991-03-01T23:59:59.000Z

132

Pitch Angle of Galactic Spiral Arms  

E-Print Network [OSTI]

One of the key parameters that characterize spiral arms in disk galaxies is a pitch angle that measures the inclination of a spiral arm to the direction of galactic rotation. The pitch angle differs from galaxy to galaxy, which suggests that the rotation law of galactic disks determines it. In order to investigate the relation between the pitch angle of spiral arms and the shear rate of galactic differential rotation, we perform local $N$-body simulations of pure stellar disks. We find that the pitch angle increases with the epicycle frequency and decreases with the shear rate and obtain the fitting formula. This dependence is explained by the swing amplification mechanism.

Michikoshi, Shugo

2014-01-01T23:59:59.000Z

133

Giant Nernst Effect and Lock-In Currents at Magic Angles in TMTSF2PF6 W. Wu,* I. J. Lee,  

E-Print Network [OSTI]

February 2003; published 28 July 2003) We have measured the thermoelectric signal along the a axis in TMTSF TMTSF2PF6, the first organic superconductor [1], is quite an unusual material. It is metallic in the thermoelectric power (TEP). Therefore, we carried out a thermoelectric study of TMTSF2PF6 under 10 kbar

Wu, Weida

134

RECOILING SUPERMASSIVE BLACK HOLES IN SPIN-FLIP RADIO GALAXIES  

SciTech Connect (OSTI)

Numerical relativity simulations predict that coalescence of supermassive black hole (SMBH) binaries leads not only to a spin flip but also to a recoiling of the merger remnant SMBHs. In the literature, X-shaped radio sources are popularly suggested to be candidates for SMBH mergers with spin flip of jet-ejecting SMBHs. Here we investigate the spectral and spatial observational signatures of the recoiling SMBHs in radio sources undergoing black hole spin flip. Our results show that SMBHs in most spin-flip radio sources have mass ratio q {approx}> 0.3 with a minimum possible value q{sub min} {approx_equal} 0.05. For major mergers, the remnant SMBHs can get a kick velocity as high as 2100 km s{sup -1} in the direction within an angle {approx}< 40 Degree-Sign relative to the spin axes of remnant SMBHs, implying that recoiling quasars are biased to be with high Doppler-shifted broad emission lines while recoiling radio galaxies are biased to large apparent spatial off-center displacements. We also calculate the distribution functions of line-of-sight velocity and apparent spatial off-center displacements for spin-flip radio sources with different apparent jet reorientation angles. Our results show that the larger the apparent jet reorientation angle is, the larger the Doppler-shifting recoiling velocity and apparent spatial off-center displacement will be. We investigate the effects of recoiling velocity on the dust torus in spin-flip radio sources and suggest that recoiling of SMBHs would lead to 'dust-poor' active galactic nuclei. Finally, we collect a sample of 19 X-shaped radio objects and for each object give the probability of detecting the predicted signatures of recoiling SMBH.

Liu, F. K.; Wang Dong [Department of Astronomy, Peking University, 100871 Beijing (China); Chen Xian, E-mail: fkliu@pku.edu.cn [Kavli Institute for Astronomy and Astrophysics, Peking University, 100871 Beijing (China)

2012-02-20T23:59:59.000Z

135

Quantised Angular Momentum Vectors and Projection Angle Distributions for Discrete  

E-Print Network [OSTI]

Quantised Angular Momentum Vectors and Projection Angle Distributions for Discrete Radon-integral angular momenta angle sets. Keywords: Discrete projection, tomography, digital angles, finite Radon that may be well suited to describe projections on discrete grids. The resulting angle sets

Boyer, Edmond

136

Small-angle neutron scattering and neutron reflectometry  

Science Journals Connector (OSTI)

Diffraction methods, interpreted loosely, could be applied to the techniques of wide-angle X-ray scattering, small-angle X-ray scattering, electron diffraction, small-angle neutron scattering, small-angle light s...

R. W. Richards

1993-01-01T23:59:59.000Z

137

Membrane magic  

SciTech Connect (OSTI)

The Kansas Power and Light Co.'s La Cyne generating station has found success with membrane filtration water pretreatment technology. The article recounts the process followed in late 2004 to install a Pall Aria 4 microfilter in Unit 1 makeup water system at the plant to produce cleaner water for reverse osmosis feed. 2 figs., 2 photos.

Buecker, B. [Kansas City Power and Light Co. (United States)

2005-09-01T23:59:59.000Z

138

Magic nails  

Science Journals Connector (OSTI)

Magnetism is one of the forgotten invisible forces unless its influence has affected one of our senses in some type of everyday use. The magnetic effects here confound our normal observations and conclusions in a seemingly practical application.

James K. Huhn

1998-01-01T23:59:59.000Z

139

Spin coating apparatus  

DOE Patents [OSTI]

A spin coating apparatus requires less cleanroom air flow than prior spin coating apparatus to minimize cleanroom contamination. A shaped exhaust duct from the spin coater maintains process quality while requiring reduced cleanroom air flow. The exhaust duct can decrease in cross section as it extends from the wafer, minimizing eddy formation. The exhaust duct can conform to entrainment streamlines to minimize eddy formation and reduce interprocess contamination at minimal cleanroom air flow rates.

Torczynski, John R. (Albuquerque, NM)

2000-01-01T23:59:59.000Z

140

Nuclear Spin Filter  

Science Journals Connector (OSTI)

A "spin filter" for selecting metastable hydrogen, deuterium, or tritium atoms with a given nuclear spin magnetic quantum number (mI) has been built and tested. With the device installed in the Los Alamos "Lamb-shift" polarized-ion source, we have obtained a deuterium negative-ion beam with ? 55% spin-state purity for mI=1, 0, or -1. An improved magnetic field homogeneity in the apparatus is expected to increase the purity to ? 75%.

Joseph L. McKibben; George P. Lawrence; Gerald G. Ohlsen

1968-05-20T23:59:59.000Z

Note: This page contains sample records for the topic "magic angle spinning" 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.


141

Classification procedure in limited angle tomography system  

SciTech Connect (OSTI)

In this work we propose the use of limited angle reconstruction algorithms combined with a procedure for defect detection and feature evaluation in three dimensions. The procedure consists of the following steps: acquisition of the X-ray projections, approximated limited angle 3D image reconstruction, and image preprocessing and classification.

Chlewicki, W.; Baniukiewicz, P.; Chady, T.; Brykalski, A. [Faculty of Electrical Engineering, Westpomeranian University of Technology, Szczecin (Poland)

2011-06-23T23:59:59.000Z

142

Limited View Angle Iterative CT Reconstruction  

E-Print Network [OSTI]

;Some Prior Literature in Limited View Tomography CT with limited-angle data and few views IRR algorithm Iterative Reconstruction-Reprojection (IRR) : An Algorithm for Limited Data Cardiac- Computed-views and limited-angle data in divergent-beam CT by E. Y. Sidky, CM Kao, and X. Pan (2006) Few-View Projection

143

Performance improvement study of a relativistic magnetron using MAGIC-3D  

SciTech Connect (OSTI)

A three dimensional particle-in-cell (PlC) code, MAGIC3D, is used to examine the performance improvement in a relativistic magnetron by perturbing technique. Asymmetrical metal rods of different length have been used to perturb the magnetic field in the annular sector of the resonant system. Enhancement up to 45% in the radiated output power has been obtained in the perturbed magnetic field case over the unperturbed one. It has also been found in the simulation that oscillation start up time is reduced by 16 %, and the amplitude of the nearest competing mode goes down 9dB compared to unperturbed case. Perturbed magnetic field also reduces the end caps current improving the efficiency. (author)

Maurya, S.; Singh, V.V.P., E-mail: smaurya@ceeri.ernet.in [Central Electronics Engineering Research Institute, Council of Scientific and Industrial Research, Pilani (India); Jain, P.K. [Center of Research in Microwave Tubes, Institute of Technology, Banaras Hindu University, Varanasi (India)

2011-07-01T23:59:59.000Z

144

Detection of VHE Bridge emission from the Crab pulsar with the MAGIC Telescopes  

E-Print Network [OSTI]

The Crab pulsar is the only astronomical pulsed source detected above 100 GeV. The emission mechanism of very high energy gamma-ray pulsation is not yet fully understood, although several theoretical models have been proposed. In order to test the new models, we measured the light curve and the spectra of the Crab pulsar with high precision by means of deep observations. We analyzed 135 hours of selected MAGIC data taken between 2009 and 2013 in stereoscopic mode. In order to discuss the spectral shape in connection with lower energies, 4.6 years of Fermi-LAT data were also analyzed. The known two pulses per period were detected with a significance of 8.0 sigma and 12.6 sigma. In addition, significant bridge emission was found between the two pulses with 6.2 sigma. This emission can not be explained with the existing theories. These data can be used for testing new theoretical models.

Saito, T Y; Hirotani, K

2015-01-01T23:59:59.000Z

145

Ultrafast nuclear spin polarization for isotopes with large nuclear spin  

Science Journals Connector (OSTI)

We theoretically investigate the temporal dynamics of nuclear spin induced by short laser pulses. To realize ultrafast nuclear spin polarization, we coherently excite the hyperfine...

Nakajima, Takashi

2009-01-01T23:59:59.000Z

146

Status of Spin Physics  

E-Print Network [OSTI]

Fundamental spin physics has made striking progresses in the last years; new ideas, experiments and data interpretations have been proposed and keep emerging. A review of some of the most important issues in the spin structure of nucleons is made and prospects for the future are discussed.

Mauro Anselmino

2001-07-09T23:59:59.000Z

147

Spin coating of electrolytes  

DOE Patents [OSTI]

Methods for spin coating electrolytic materials onto substrates are disclosed. More particularly, methods for depositing solid coatings of ion-conducting material onto planar substrates and onto electrodes are disclosed. These spin coating methods are employed to fabricate electrochemical sensors for use in measuring, detecting and quantifying gases and liquids.

Stetter, Joseph R. (Naperville, IL); Maclay, G. Jordan (Maywood, IL)

1989-01-01T23:59:59.000Z

148

Spin superconductor in ferromagnetic graphene  

Science Journals Connector (OSTI)

We show a spin superconductor in ferromagnetic graphene as the counterpart to the charge superconductor in which a spin-polarized electron-hole pair plays the role of the spin 2(?/2) “Cooper pair” with a neutral charge. We present a BCS-type theory for the spin superconductor. With the “London-type equations” of the super-spin-current density, we show the existence of an electric “Meissner effect” against a spatial varying electric field. We further study a spin superconductor/normal conductor/spin superconductor junction and predict a spin-current Josephson effect.

Qing-feng Sun; Zhao-tan Jiang; Yue Yu; X. C. Xie

2011-12-02T23:59:59.000Z

149

Results from the spin programme at COSY-ANKE  

E-Print Network [OSTI]

Some of the important results from the COSY-Juelich spin programme are summarised. These include the measurement of the deuteron beam momentum through the excitation of a depolarising resonance, which allowed the mass of the eta-meson to be determined to high precision. The charge exchange of polarised deuterons on hydrogen gave rise to a detailed study of the spin dependence of large angle neutron-proton elastic scattering amplitudes. The measurements of the cross section and analysing powers for pion production in both pp and pn collisions at 353 MeV could be described very successfully in terms of a partial wave decomposition.

A. Kacharava; C. Wilkin

2012-12-12T23:59:59.000Z

150

Anisotropic Spin Relaxation in Graphene  

Science Journals Connector (OSTI)

Spin relaxation in graphene is investigated in electrical graphene spin valve devices in the nonlocal geometry. Ferromagnetic electrodes with in-plane magnetizations inject spins parallel to the graphene layer. They are subject to Hanle spin precession under a magnetic field B applied perpendicular to the graphene layer. Fields above 1.5 T force the magnetization direction of the ferromagnetic contacts to align to the field, allowing injection of spins perpendicular to the graphene plane. A comparison of the spin signals at B=0 and B=2??T shows a 20% decrease in spin relaxation time for spins perpendicular to the graphene layer compared to spins parallel to the layer. We analyze the results in terms of the different strengths of the spin-orbit effective fields in the in-plane and out-of-plane directions and discuss the role of the Elliott-Yafet and Dyakonov-Perel mechanisms for spin relaxation.

N. Tombros; S. Tanabe; A. Veligura; C. Jozsa; M. Popinciuc; H. T. Jonkman; B. J. van Wees

2008-07-25T23:59:59.000Z

151

The major upgrade of the MAGIC telescopes, Part I: The hardware improvements and the commissioning of the system  

E-Print Network [OSTI]

The MAGIC telescopes are two Imaging Atmospheric Cherenkov Telescopes (IACTs) located on the Canary island of La Palma. The telescopes are designed to measure Cherenkov light from air showers initiated by gamma rays in the energy regime from around 50 GeV to more than 50 TeV. The two telescopes were built in 2004 and 2009, respectively, with different cameras, triggers and readout systems. In the years 2011-2012 the MAGIC collaboration undertook a major upgrade to make the stereoscopic system uniform, improving its overall performance and easing its maintenance. In particular, the camera, the receivers and the trigger of the first telescope were replaced and the readout of the two telescopes was upgraded. This paper (Part I) describes the details of the upgrade as well as the basic performance parameters of MAGIC such as raw data treatment, dead time of the system, linearity in the electronic chain and sources of noise. In Part II, we describe the physics performance of the upgraded system.

Aleksic, J; Antonelli, L A; Antoranz, P; Babic, A; Bangale, P; Barcelo, M; Barrio, J A; Gonzalez, J Becerra; Bednarek, W; Bernardini, E; Biasuzzi, B; Biland, A; Bitossi, M; Blanch, O; Bonnefoy, S; Bonnoli, G; Borracci, F; Bretz, T; Carmona, E; Carosi, A; Cecchi, R; Colin, P; Colombo, E; Contreras, J L; Corti, D; Cortina, J; Covino, S; Da Vela, P; Dazzi, F; De Angelis, A; De Caneva, G; De Lotto, B; Wilhelmi, E de Ona; Mendez, C Delgado; Dettlaff, A; Prester, D Dominis; Dorner, D; Doro, M; Einecke, S; Eisenacher, D; Elsaesser, D; Fidalgo, D; Fink, D; Fonseca, M V; Font, L; Frantzen, K; Fruck, C; Galindo, D; Lopez, R J Garcia; Garczarczyk, M; Terrats, D Garrido; Gaug, M; Giavitto, G; Godinovic, N; Munoz, A Gonzalez; Gozzini, S R; Haberer, W; Hadasch, D; Hanabata, Y; Hayashida, M; Herrera, J; Hildebrand, D; Hose, J; Hrupec, D; Idec, W; Illa, J M; Kadenius, V; Kellermann, H; Knoetig, M L; Kodani, K; Konno, Y; Krause, J; Kubo, H; Kushida, J; La Barbera, A; Lelas, D; Lemus, J L; Lewandowska, N; Lindfors, E; Lombardi, S; Longo, F; Lopez, M; Lopez-Coto, R; Lopez-Oramas, A; Lorca, A; Lorenz, E; Lozano, I; Makariev, M; Mallot, K; Maneva, G; Mankuzhiyil, N; Mannheim, K; Maraschi, L; Marcote, B; Mariotti, M; Martinez, M; Mazin, D; Menzel, U; Miranda, J M; Mirzoyan, R; Moralejo, A; Munar-Adrover, P; Nakajima, D; Negrello, M; Neustroev, V; Niedzwiecki, A; Nilsson, K; Nishijima, K; Noda, K; Orito, R; Overkemping, A; Paiano, S; Palatiello, M; Paneque, D; Paoletti, R; Paredes, J M; Paredes-Fortuny, X; Persic, M; Poutanen, J; Moroni, P G Prada; Prandini, E; Puljak, I; Reinthal, R; Rhode, W; Ribo, M; Rico, J; Garcia, J Rodriguez; Rugamer, S; Saito, T; Saito, K; Satalecka, K; Scalzotto, V; Scapin, V; Schultz, C; Schlammer, J; Schmidl, S; Schweizer, T; Sillanpaa, A; Sitarek, J; Snidaric, I; Sobczynska, D; Spanier, F; Stamerra, A; Steinbring, T; Storz, J; Strzys, M; Takalo, L; Takami, H; Tavecchio, F; Tejedor, L A; Temnikov, P; Terzic, T; Tescaro, D; Teshima, M; Thaele, J; Tibolla, O; Torres, D F; Toyama, T; Treves, A; Vogler, P; Wetteskind, H; Will, M; Zanin, R

2014-01-01T23:59:59.000Z

152

Unified description of magic numbers of metal clusters in terms of the 3-dimensional q-deformed harmonic oscillator  

E-Print Network [OSTI]

Magic numbers predicted by a 3-dimensional q-deformed harmonic oscillator with Uq(3)>SOq(3) symmetry are compared to experimental data for atomic clusters of alkali metals (Li, Na, K, Rb, Cs), noble metals (Cu, Ag, Au), divalent metals (Zn, Cd), and trivalent metals (Al, In), as well as to theoretical predictions of jellium models, Woods-Saxon and wine bottle potentials, and to the classification scheme using the 3n+l pseudo quantum number. In alkali metal clusters and noble metal clusters the 3-dimensional q-deformed harmonic oscillator correctly predicts all experimentally observed magic numbers up to 1500 (which is the expected limit of validity for theories based on the filling of electronic shells), while in addition it gives satisfactory results for the magic numbers of clusters of divalent metals and trivalent metals, thus indicating that Uq(3), which is a nonlinear extension of the U(3) symmetry of the spherical (3-dimensional isotropic) harmonic oscillator, is a good candidate for being the symmetry ...

Bonatsos, Dennis; Lenis, D; Raychev, P P; Roussev, R P; Terziev, P A

2000-01-01T23:59:59.000Z

153

Correlation Functions and Spin  

E-Print Network [OSTI]

The k-electron correlation function of a free chaotic electron beam is derived with the spin degree of freedom taken into account. It is shown that it can be expressed with the help of correlation functions for a polarized electron beam of all orders up to k and the degree of spin polarization. The form of the correlation function suggests that if the electron beam is not highly polarized, observing multi-particle correlations should be difficult. The result can be applied also to chaotic photon beams, the degree of spin polarization being replaced by the degree of polarization.

T. Tyc

2000-06-30T23:59:59.000Z

154

Nuclear-spin noise  

Science Journals Connector (OSTI)

The spectral density of the Nyquist noise current in a tuned circuit coupled to a sample of nuclear spins has been measured at He4 temperatures with a dc SQUID used as a rf amplifier. When the sample is in thermal equilibrium, a dip is observed in the spectral density at the Larmor frequency. For zero spin polarization, on the other hand, a bump in the spectral density is observed. This bump is due to temperature-independent fluctuations in the transverse component of magnetization, and represents spontaneous emission from the spins into the circuit.

Tycho Sleator; Erwin L. Hahn; Claude Hilbert; John Clarke

1985-10-21T23:59:59.000Z

155

Spin waves in a persistent spin-current Fermi liquid  

Science Journals Connector (OSTI)

We report two theoretical results for transverse spin waves, which arise in a system with a persistent spin current. Using Fermi liquid theory, we introduce a spin current in the ground state of a polarized or unpolarized Fermi liquid, and we derive the resultant spin waves using the Landau kinetic equation. The resulting spin waves have a q1 and q1/2 dispersion to leading order for the polarized and unpolarized systems, respectively.

J. D. Feldmann and K. S. Bedell

2010-06-14T23:59:59.000Z

156

International Spin Physics 2014 Summary  

E-Print Network [OSTI]

The Stern-Gerlach experiment and the origin of electron spin are described in historical context. SPIN 2014 occurs on the fortieth anniversary of the first International High Energy Spin Physics Symposium at Argonne in 1974. A brief history of the international spin conference series is presented.

Milner, Richard G

2015-01-01T23:59:59.000Z

157

International Spin Physics 2014 Summary  

E-Print Network [OSTI]

The Stern-Gerlach experiment and the origin of electron spin are described in historical context. SPIN 2014 occurs on the fortieth anniversary of the first International High Energy Spin Physics Symposium at Argonne in 1974. A brief history of the international spin conference series is presented.

Richard G. Milner

2015-02-06T23:59:59.000Z

158

Electron spin resonance of ultrahigh vacuum evaporated amorphous silicon: In situ and ex situ studies  

Science Journals Connector (OSTI)

An in situ study of the electron spin resonance (ESR) of ultrahigh vacuum evaporated amorphous silicon is performed to define the characteristics of the signal as a function of preparation conditions. The influence of deposition rate, temperature of substrates, temperature of annealing, angle of incidence of the vapor beam, contamination by air exposure, and the presence of hydrogen during growth have been investigated. Porosity effects depending on thermal history and angle of incidence, which allow contamination, are observed by ESR. It is found that the spin density is mainly determined by the thermal history and varies only within a factor of about 3 when contamination effects are not involved. This is contrary to other results which we believe were obtained from contaminated specimens. Related variations of linewidth and saturation behavior are observed. Ex situ measurements of linewidth, saturation behavior, and ESR susceptibility are done as a function of temperature. The results of these measurements are discussed in terms of two extreme possibilities for spins: individual spins randomly distributed and clusters of spins. The question of a possible association of spins with voids is also discussed. The results are compatible with a model of individual spins randomly distributed. An approach to the relation between spins and conductivity is presented.

P. A. Thomas; M. H. Brodsky; D. Kaplan; D. Lepine

1978-10-01T23:59:59.000Z

159

Localized Spins on Graphene  

Science Journals Connector (OSTI)

The problem of a magnetic impurity, atomic or molecular, absorbed on top of a carbon atom in otherwise clean graphene is studied using the numerical renormalization group. The spectral, thermodynamic, and scattering properties of the impurity are described in detail. In the presence of a small magnetic field, the low-energy electronic features of graphene make it possible to inject spin-polarized currents through the impurity using a scanning tunneling microscope. Furthermore, the impurity scattering becomes strongly spin dependent and for a finite impurity concentration it leads to spin-polarized bulk currents and a large magnetoresistance. In gated graphene the impurity spin is Kondo screened at low temperatures. However, at temperatures larger than the Kondo temperature, the anomalous magnetotransport properties are recovered.

P. S. Cornaglia; Gonzalo Usaj; C. A. Balseiro

2009-01-27T23:59:59.000Z

160

MEASUREMENTS OF STELLAR INCLINATIONS FOR KEPLER PLANET CANDIDATES. II. CANDIDATE SPIN-ORBIT MISALIGNMENTS IN SINGLE- AND MULTIPLE-TRANSITING SYSTEMS  

E-Print Network [OSTI]

We present a test for spin-orbit alignment for the host stars of 25 candidate planetary systems detected by the Kepler spacecraft. The inclination angle of each star's rotation axis was estimated from its rotation period, ...

Hirano, Teruyuki

Note: This page contains sample records for the topic "magic angle spinning" 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

Spin rotation and oscillation of high energy particles in storage ring  

E-Print Network [OSTI]

Phenomena of rotation and oscillations of particle spin are discussed for particles rotating in storage ring. The fact that these effects are described by spin-dependent part of zero-angle scattering amplitude allows to use them for the measurement of this amplitude at different energies of colliding particles. It is shown that effect magnitudes are large and they can be observed at the existing accelerators.

Vladimir G. Baryshevsky

2001-09-12T23:59:59.000Z

162

GO, an exec for running the programs: CELL, COLLIDER, MAGIC, PATRICIA, PETROS, TRANSPORT, and TURTLE  

SciTech Connect (OSTI)

An exec has been written and placed on the PEP group's public disk to facilitate the use of several PEP related computer programs available on VM. The exec's program list currently includes: CELL, COLLIDER, MAGIC, PATRICIA, PETROS, TRANSPORT, and TURTLE. In addition, provisions have been made to allow addition of new programs to this list as they become available. The GO exec is directly callable from inside the Wylbur editor (in fact, currently this is the only way to use the GO exec.). It provides the option of running any of the above programs in either interactive or batch mode. In the batch mode, the GO exec sends the data in the Wylbur active file along with the information required to run the job to the batch monitor (BMON, a virtual machine that schedules and controls execution of batch jobs). This enables the user to proceed with other VM activities at his/her terminal while the job executes, thus making it of particular interest to the users with jobs requiring much CPU time to execute and/or those wishing to run multiple jobs independently. In the interactive mode, useful for small jobs requiring less CPU time, the job is executed by the user's own Virtual Machine using the data in the active file as input. At the termination of an interactive job, the GO exec facilitates examination of the output by placing it in the Wylbur active file.

Shoaee, H.

1982-05-01T23:59:59.000Z

163

GO, an exec for running the programs: CELL, COLLIDER, MAGIC, PATRICIA, PETROS, TRANSPORT and TURTLE  

SciTech Connect (OSTI)

An exec has been written and placed on the PEP group's public disk (PUBRL 192) to facilitate the use of several PEP related computer programs available on VM. The exec's program list currently includes: CELL, COLLIDER, MAGIC, PATRICIA, PETROS, TRANSPORT, and TURTLE. In addition, provisions have been made to allow addition of new programs to this list as they become available. The GO exec is directly callable from inside the Wylbur editor (in fact, currently this is the only way to use the GO exec.) It provides the option of running any of the above programs in either interactive or batch mode. In the batch mode, the GO exec sends the data in the Wylbur active file along with the information required to run the job to the batch monitor (BMON, a virtual machine that schedules and controls execution of batch jobs). This enables the user to proceed with other VM activities at his/her terminal while the job executes, thus making it of particular interest to the users with jobs requiring much CPU time to execute and/or those wishing to run multiple jobs independently. In the interactive mode, useful for small jobs requiring less CPU time, the job is executed by the user's own Virtual Machine using the data in the active file as input. At the termination of an interactive job, the GO exec facilitates examination of the output by placing it in the Wylbur active file.

Shoaee, H.

1982-05-01T23:59:59.000Z

164

Anomalous pairing vibration in neutron-rich Sn isotopes beyond the N=82 magic number  

E-Print Network [OSTI]

Two-neutron transfer associated with the pair correlation in superfluid neutron-rich nuclei is studied with focus on low-lying $0^+$ states in Sn isotopes beyond the N=82 magic number. We describe microscopically the two-neutron addition and removal transitions by means of the Skyrme-Hartree-Fock-Bogoliubov mean-field model and the continuum quasiparticle random phase approximation formulated in the coordinate space representation. It is found that the pair transfer strength for the transitions between the ground states becomes significantly large for the isotopes with $A \\ge 140$, reflecting very small neutron separation energy and long tails of the weakly bound $3p$ orbits. In $^{132-140}$Sn, a peculiar feature of the pair transfer is seen in transitions to low-lying excited $0^+$ states. They can be regarded as a novel kind of pair vibrational mode which is characterized by an anomalously long tail of the transition density extending to far outside of the nuclear surface, and a large strength comparable to that of the ground-state transitions. The presence of the weakly bound neutron orbits plays a central role for these anomalous behaviors.

Hirotaka Shimoyama; Masayuki Matsuo

2011-06-09T23:59:59.000Z

165

Small Angle X-Ray Scattering Detector  

DOE Patents [OSTI]

A detector for time-resolved small-angle x-ray scattering includes a nearly constant diameter, evacuated linear tube having an end plate detector with a first fluorescent screen and concentric rings of first fiber optic bundles for low angle scattering detection and an annular detector having a second fluorescent screen and second fiber optic bundles concentrically disposed about the tube for higher angle scattering detection. With the scattering source, i.e., the specimen under investigation, located outside of the evacuated tube on the tube's longitudinal axis, scattered x-rays are detected by the fiber optic bundles, to each of which is coupled a respective photodetector, to provide a measurement resolution, i.e., dq/q, where q is the momentum transferred from an incident x-ray to an x-ray scattering specimen, of 2% over two (2) orders of magnitude in reciprocal space, i.e., qmax/qmin approx=lO0.

Hessler, Jan P.

2004-06-15T23:59:59.000Z

166

Influence of Topological Spin Fluctuations on Charge Transport  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Influence of Topological Spin Fluctuations on Charge Transport Print Influence of Topological Spin Fluctuations on Charge Transport Print Layered transition metal oxides are the focus of intense research efforts because they might clarify the superconducting mechanism of cuprate high-temperature superconductors (HTSCs). A case in point is NaxCoO2 with x = 0.7, which is a parent compound for a family of cobaltites that exhibits superconductivity. This class of materials is also thought to be ideal for detecting the long-sought resonating valence bond (RVB) state of matter proposed by Philip Anderson of Princeton University in 1973. Researchers from Princeton University and ALS are the first to use angle-resolved photoemission spectroscopy (ARPES) to demonstrate the strongly electron correlated nature of this material and to provide evidence that charge transport is strongly influenced by topological spin frustration.

167

Influence of Topological Spin Fluctuations on Charge Transport  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Influence of Topological Spin Fluctuations on Charge Transport Print Influence of Topological Spin Fluctuations on Charge Transport Print Layered transition metal oxides are the focus of intense research efforts because they might clarify the superconducting mechanism of cuprate high-temperature superconductors (HTSCs). A case in point is NaxCoO2 with x = 0.7, which is a parent compound for a family of cobaltites that exhibits superconductivity. This class of materials is also thought to be ideal for detecting the long-sought resonating valence bond (RVB) state of matter proposed by Philip Anderson of Princeton University in 1973. Researchers from Princeton University and ALS are the first to use angle-resolved photoemission spectroscopy (ARPES) to demonstrate the strongly electron correlated nature of this material and to provide evidence that charge transport is strongly influenced by topological spin frustration.

168

Measurements of $t\\bar{t}$ spin correlations in CMS  

E-Print Network [OSTI]

We present an overview of the measurements of $t\\bar{t}$ spin correlations in the CMS Collaboration. We present two analyses both in the dilepton channel using proton-proton collisions at $\\sqrt{s}\\, =\\, 7$ TeV based on an integrated luminosity of 5.0 fb$^{-1}$. The spin correlations and polarization are measured using angular asymmetries. The results are consistent with unpolarized top quarks and Standard Model spin correlation. The second analysis sets a limit on the real part of the top-quark chromo-magnetic dipole moment of $-0.043\\, <\\, Re({\\hat{\\mu}}_{t})\\, <\\, 0.117$ at $95\\,%$ confidence level through the measured azimuthal angle difference between the two charged leptons from $t\\bar{t}$ production.

Kelly Beernaert

2014-11-26T23:59:59.000Z

169

Influence of Topological Spin Fluctuations on Charge Transport  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Influence of Topological Spin Fluctuations on Charge Transport Print Influence of Topological Spin Fluctuations on Charge Transport Print Layered transition metal oxides are the focus of intense research efforts because they might clarify the superconducting mechanism of cuprate high-temperature superconductors (HTSCs). A case in point is NaxCoO2 with x = 0.7, which is a parent compound for a family of cobaltites that exhibits superconductivity. This class of materials is also thought to be ideal for detecting the long-sought resonating valence bond (RVB) state of matter proposed by Philip Anderson of Princeton University in 1973. Researchers from Princeton University and ALS are the first to use angle-resolved photoemission spectroscopy (ARPES) to demonstrate the strongly electron correlated nature of this material and to provide evidence that charge transport is strongly influenced by topological spin frustration.

170

Sandia National Laboratories: Spontaneous Coherence and Spin...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Spontaneous Coherence and Spin Texture Spontaneous Coherence and Spin Texture videobanner Spontaneous Coherence and Spin Texture in a Cold Exciton Gas (Watch Video) Speaker:...

171

The influence of naturally-occurring organic acids on model estimates of lakewater acidification using the model of acidification of groundwater in catchments (MAGIC)  

SciTech Connect (OSTI)

A project for the US Department of Energy, entitled Incorporation of an organic acid representation into MAGIC (Model of Acidification of Groundwater in Catchments) and Testing of the Revised Model UsingIndependent Data Sources'' was initiated by E S Environmental Chemistry, Inc. in March, 1992. Major components of the project include: improving the MAGIC model by incorporating a rigorous organic acid representation, based on empirical data and geochemical considerations, and testing the revised model using data from paleolimnological hindcasts of preindustrial chemistry for 33 Adirondack Mountain lakes, and the results of whole-catchment artificial acidification projects in Maine and Norway. The ongoing research in this project involves development of an organic acid representation to be incorporated into the MAGIC modeland testing of the improved model using three independent data sources. The research during Year 1 has included conducting two workshops to agree on an approach for the organic acid modeling, developing the organic subroutine and incorporating it into MAGIC (Task 1), conducing MAGIC hindcasts for Adirondack lakes and comparing the results with paleolimnological reconstructions (Task 2), and conducting site visits to the manipulation project sites in Maine and Norway. The purpose of this report is to provide a summary of the work that has been conducted on this project during Year 1. Tasks 1 and 2 have now been completed.

Sullivan, T.J.; Eilers, J.M. (E and S Environmental Chemistry, Inc., Corvallis, OR (United States)); Cosby, B.J. (Virginia Univ., Charlottesville, VA (United States). Dept. of Environmental Sciences); Driscoll, C.T. (Syracuse Univ., NY (United States). Dept. of Civil Engineering); Hemond, H.F. (Massachusetts Inst. of Tech., Cambridge, MA (United States). Dept. of Civil Engineering); Charles, D.F.

1993-03-05T23:59:59.000Z

172

Determination of the Higgs CP-mixing angle in the tau decay channels  

E-Print Network [OSTI]

The measurement of possible Higgs sector CP-violation in the tau decay channels at the LHC is investigated. A CP-violating effect would manifest itself in these decay modes in characteristic spin-spin correlations of the tau lepton pairs which can be accessed using the momenta and impact parameters of the charged tau decay particles. We examine a CP-sensitive observable for a 125 GeV Higgs boson resonance in the gluon fusion channel at the LHC. Furthermore, we consider the distribution of this observable for the irreducible Drell-Yan background. By splitting these events into two categories we obtain two different distributions which can be used for calibration purposes. Finally, we estimate the achievable precision of the scalar-pseudo-scalar mixing angle of the tau decay channel for Run II and the high luminosity run of the LHC.

Berge, Stefan; Kirchner, Sebastian

2014-01-01T23:59:59.000Z

173

Neutron-Proton Scattering at Small Angles  

Science Journals Connector (OSTI)

24 May 1955 research-article Neutron-Proton Scattering at Small Angles...Thresher R. G. P. Voss R. Wilson Neutron-proton scattering has been measured from 6 to 61 5 degrees c.m. for neutrons of effective energy 105 3 and 137 5...

1955-01-01T23:59:59.000Z

174

Geometric phase for collinear conical intersections. I. Geometric phase angle and vector potentials  

SciTech Connect (OSTI)

We present a method for properly treating collinear conical intersections in triatomic systems. The general vector potential (gauge theory) approach for including the geometric phase effects associated with collinear conical intersections in hyperspherical coordinates is presented. The current study develops an introductory method in the treatment of collinear conical intersections by using the phase angle method. The geometric phase angle, {eta}, in terms of purely internal coordinates is derived using the example of a spin-aligned quartet lithium triatomic system. A numerical fit and thus an analytical form for the associated vector potentials are explicitly derived for this triatomic A{sub 3} system. The application of this methodology to AB{sub 2} and ABC systems is also discussed.

Li Xuan [Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma, Norman, Oklahoma 73019 (United States); Department of Chemistry, The University of British Columbia, Vancouver, British Columbia V6T 1Z1 (Canada); Brue, Daniel A.; Blandon, Juan D.; Parker, Gregory A. [Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma, Norman, Oklahoma 73019 (United States); Kendrick, Brian K. [Theoretical Division (T-1, MS B268), Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)

2011-02-14T23:59:59.000Z

175

Small Angle Polarization in High Energy P--P Scattering Through Nonperturbative Chiral Symmetry Breaking  

E-Print Network [OSTI]

We show that a large anomalous contribution due to nonperturbative instanton-like gluonic field configurations to the axial charge of the proton implies high-energy spin effects in $p-p$ elastic scattering. This is the same mechanism which is responsible for anomalous baryon number violation at high energy in the standard model. We compute the proton polarization due to these effects and we show that it is proportional to the center-of-mass scattering angle with a universal (energy-independent) slope of order unity.

Mauro Anselmino; Stefano Forte

1992-11-06T23:59:59.000Z

176

Electron Spin Decoherence in Silicon Carbide Nuclear Spin Bath  

E-Print Network [OSTI]

In this paper, we study the electron spin decoherence of single defects in silicon carbide (SiC) nuclear spin bath. We find that, although the natural abundance of $^{29}\\rm{Si}$ ($p_{\\rm{Si}}=4.7\\%$) is about 4 times larger than that of $^{13}{\\rm C}$ ($p_{\\rm{C}}=1.1\\%$), the electron spin coherence time of defect centers in SiC nuclear spin bath in strong magnetic field ($B>300~\\rm{Gauss}$) is longer than that of nitrogen-vacancy (NV) centers in $^{13}{\\rm C}$ nuclear spin bath in diamond. The reason for this counter-intuitive result is the suppression of heteronuclear-spin flip-flop process in finite magnetic field. Our results show that electron spin of defect centers in SiC are excellent candidates for solid state spin qubit in quantum information processing.

Li-Ping Yang; Christian Burk; Mattias Widmann; Sang-Yun Lee; Jörg Wrachtrup; Nan Zhao

2014-09-16T23:59:59.000Z

177

Decoherence from spin environments  

Science Journals Connector (OSTI)

We examine two exactly solvable models of decoherence—a central spin-system, (i) with and (ii) without a self-Hamiltonian, interacting with a collection of environment spins. In the absence of a self-Hamiltonian we show that in this model (introduced some time ago to illustrate environment-induced superselection) generic assumptions about the coupling strengths can lead to a universal (Gaussian) suppression of coherence between pointer states. On the other hand, we show that when the dynamics of the central spin is dominant a different regime emerges, which is characterized by a non-Gaussian decay and a dramatically different set of pointer states. We explore the regimes of validity of the Gaussian decay and discuss its relation to the spectral features of the environment and to the Loschmidt echo (or fidelity).

F. M. Cucchietti; J. P. Paz; W. H. Zurek

2005-11-29T23:59:59.000Z

178

Measurement of Contact Angles in the Presence of Mass Transfer  

Science Journals Connector (OSTI)

... has shown that, for contact angles measured without mass transfer under isothermal conditions on differing roughened surfaces, cos 6x = r cos 0, where 61 is the contact angle on ... , cos 6x = r cos 0, where 61 is the contact angle on a roughened surface and 0 is the true contact angle on a perfectly smooth surface.

A. B. PONTER; P. G. THORNLEY

1965-09-18T23:59:59.000Z

179

Spin-Charge Separation in the Quantum Spin Hall State  

Science Journals Connector (OSTI)

The quantum spin Hall state is a topologically nontrivial insulator state protected by the time-reversal symmetry. We show that such a state always leads to spin-charge separation in the presence of a ? flux. Our result is generally valid for any interacting system. We present a proposal to experimentally observe the phenomenon of spin-charge separation in the recently discovered quantum spin Hall system.

Xiao-Liang Qi and Shou-Cheng Zhang

2008-08-19T23:59:59.000Z

180

Analytical formula for numerical evaluations of the Wigner rotation matrices at high spins  

E-Print Network [OSTI]

The Wigner d function, which is the essential part of an irreducible representation of SU(2) and SO(3) parameterized with Euler angles, has been know to suffer from a serious numerical errors at high spins, if it is calculated by means of the Wigner formula as a polynomial of cos and sin of half of the second Euler angle. This paper shows a way to avoid this problem by expressing the d functions as the Fourier series of the half angle. A precise numerical table of the coefficients of the series is obtainable from a web site.

Tajima, Naoki

2015-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "magic angle spinning" 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

Analytical formula for numerical evaluations of the Wigner rotation matrices at high spins  

E-Print Network [OSTI]

The Wigner d function, which is the essential part of an irreducible representation of SU(2) and SO(3) parameterized with Euler angles, has been know to suffer from a serious numerical errors at high spins, if it is calculated by means of the Wigner formula as a polynomial of cos and sin of half of the second Euler angle. This paper shows a way to avoid this problem by expressing the d functions as the Fourier series of the half angle. A precise numerical table of the coefficients of the series is obtainable from a web site.

Naoki Tajima

2015-01-26T23:59:59.000Z

182

Quantum spin dynamics  

E-Print Network [OSTI]

The classical Landau-Lifshitz equation has been derived from quantum mechanics. Starting point is the assumption of a non-Hermitian Hamilton operator to take the energy dissipation into account. The corresponding quantum mechanical time dependent Schr\\"odinger, Liouville and Heisenberg equation have been described and the similarities and differences between classical and quantum mechanical spin dynamics have been discussed. Furthermore, a time dependent Schr\\"odinger equation corresponding to the classical Landau-Lifshitz-Gilbert equation and two ways to include temperature into the quantum mechanical spin dynamics have been proposed.

Robert Wieser

2014-10-23T23:59:59.000Z

183

RHIC Spin Program Goals of RHIC Spin Program  

E-Print Network [OSTI]

longitudinal polarization · polarized atomic hydrogen jet target Installed and commissioned during run 4 violating production of W± · Transverse spin: Transversity () & transverse spin effects with connections to orbital angular momentum (Ly) #12;5/11/2006 L.C.Bland, DOE Review of MEP 5 Methods to Address Spin

184

Building Energy Software Tools Directory: SunAngle Professional Suite  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

SunAngle Professional Suite SunAngle Professional Suite SunAngle Professional logo. More sophisticated, robust, and well-documented version of SunAngle for people interested in better understanding the calculation methodology or developing their own solar angle calculation tools. The Professional Suite includes well-documented HTML/JavaScript and Microsoft Excel versions of SunAngle, plus a detailed technical manual explaining how to perform all of the underlying calculations. Screen Shots Keywords sun angle, solar calculator Validation/Testing Outputs of the SunAngle Professional Suite were compared to published standard sources of solar angle data; this is documented in the SunAngle Technical Manual. Expertise Required Knowledge of HTML, JavaScript, and/or Microsoft Excel, if the user wishes

185

Transverse Spin Physics: Recent Developments  

SciTech Connect (OSTI)

Transverse-spin physics has been very active and rapidly developing in the last few years. In this talk, I will briefly summarize recent theoretical developments, focusing on the associated QCD dynamics in transverse spin physics.

Yuan, Feng

2008-12-10T23:59:59.000Z

186

ARPES Provides Direct Evidence of Spin-Wave Coupling  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

ARPES Provides Direct Evidence ARPES Provides Direct Evidence of Spin-Wave Coupling ARPES Provides Direct Evidence of Spin-Wave Coupling Print Wednesday, 30 March 2005 00:00 The electronic properties of a metal are determined by the dynamical behavior of its conduction electrons. Conventional band theory accounts for the interaction of the electrons with the static ion lattice. However, coupling to further microscopic degrees of freedom can alter the electron dynamics considerably. For example, "conventional" superconductivity emerges as a result of the electrons' interaction with lattice vibrations (phonons). In magnetic materials, coupling with spin waves (magnons) is also expected. Such interactions may contribute to high-temperature superconductivity in novel materials. Unfortunately, lattice vibrations and spin waves have similar energy scales, hindering detailed study. Researchers have taken a new approach in analyzing the electron bands of ferromagnetic iron. Angle-resolved photoemission spectroscopy (ARPES) provides direct spectroscopic evidence of altered electron mass and energy (quasiparticle formation) in a magnetic solid due to coupling with spin waves.

187

ACCELERATION INDUCED SPIN AND  

E-Print Network [OSTI]

spin at each event. A unique and natural law of parallel transport of quantum states between different mechanical line of reasoning leads to the heuristic con* *clusion that gravitation is to be identified AND ITS GAUGE GEOMETRY The line of reasoning which lies at the base of Einstein's gravitation the

Gerlach, Ulrich

188

Muon spin rotation  

Science Journals Connector (OSTI)

... vast funding accorded high energy physics research in recent years.?SR-the acronym stands for Muon Spin Rotation, Relaxation, Resonance, Research or what have you, and refers to the ... the most promising new work related to purely chemical problems. Indeed, the use of muons in chemistry is striking not only for providing yet another probe of chemical systems, ...

G. C. Stirling

1978-11-23T23:59:59.000Z

189

Synthesis, Structure, and Properties of Low-Spin Manganese(III)-Poly(pyrazolyl)borate Complexes  

E-Print Network [OSTI]

.g., catalase, peroxidase, superoxide dismutase),2,3 in the oxygen-evolving center (OEC) of photosystem II,4, indicates absence of the characteristic Jahn-Teller distortion of a high-spin d4 center. N-Mn-N bite angles

Baik, Mu-Hyun

190

Small Angle X-Ray Scattering Detector  

DOE Patents [OSTI]

A detector for time-resolved small-angle x-ray scattering includes a nearly constant diameter, evacuated linear tube having an end plate detector with a first fluorescent screen and concentric rings of first fiber optic bundles for low angle scattering detection and an annular detector having a second fluorescent screen and second fiber optic bundles concentrically disposed about the tube for higher angle scattering detection. With the scattering source, i.e., the specimen under investigation, located outside of the evacuated tube on the tube's longitudinal axis, scattered x-rays are detected by the fiber optic bundles, to each of which is coupled a respective photodetector, to provide a measurement resolution, i.e., dq/q, where q is the momentum transferred from an incident x-ray to an x-ray scattering specimen, of 2% over two (2) orders of magnitude in reciprocal space, i.e., q.sub.max /q.sub.min.congruent.100.

Hessler, Jan P. (Downers Grove, IL)

2004-06-15T23:59:59.000Z

191

Neutron scattering studies of spin?glass alloys  

Science Journals Connector (OSTI)

Neutron diffraction investigations of binary alloys such as Cu?Mn beginning with the earliest reported measurements in 1957 show no evidence of any long range magnetic order except for the broad short range order peaks at the (1 1/2 0) type positions attributed to both atomic and magnetic short range ordering in alloys containing more than about 10–15 at.% Mn. The current interest in spin glasses is focused on the theoretical possibility of a magnetic phase transition to the spin glass state in the dilute random substitutional alloys. Recently neutron scatteringmeasurements have been attempted to study the dynamics of spins in the alloys with a view to understanding the nature of the processes leading to the spin glass state. Small angle neutron scatteringmeasurements on Au?Fe alloys with Fe concentrations below the percolation threshold for ferromagnetism show a series of q?dependent maxima in the total scattering intensity suggesting a continuum of freezing temperatures. Other measurements employing energy analysis by the time?of?flight technique at somewhat larger q’s on the same and other alloys such as Cu?Mn Pd?Mn show a broad quasi?elastic paramagnetic spectrum at high temperatures whose energy width decreases with decreasing temperature apparently goes through a minimum especially at the higher q’s but always remains finite as T?0 K. The intensity of the quasi?elastic scattering however diminishes progressively below some temperature with a simultaneous continuous increase of the elastic peak intensity. Although the implications of the recent phase transition theories of spin glasses to the dynamics of spins at finite scattering vectors are not entirely clear the present neutron scattering results appear not inconsistent with the alternative picture of a continuous process of freezing of spins occurring at least over a finite temperature range.

A. P. Murani

1978-01-01T23:59:59.000Z

192

SPIN STATE AND MOMENT OF INERTIA CHARACTERIZATION OF 4179 TOUTATIS  

SciTech Connect (OSTI)

The 4.5 km long near-Earth asteroid 4179 Toutatis has made close Earth flybys approximately every four years between 1992 and 2012, and has been observed with high-resolution radar imaging during each approach. Its most recent Earth flyby in 2012 December was observed extensively at the Goldstone and Very Large Array radar telescopes. In this paper, Toutatis' spin state dynamics are estimated from observations of five flybys between 1992 and 2008. Observations were used to fit Toutatis' spin state dynamics in a least-squares sense, with the solar and terrestrial tidal torques incorporated in the dynamical model. The estimated parameters are Toutatis' Euler angles, angular velocity, moments of inertia, and the center-of-mass-center-of-figure offset. The spin state dynamics as well as the uncertainties of the Euler angles and angular velocity of the converged solution are then propagated to 2012 December in order to compare the dynamical model to the most recent Toutatis observations. The same technique of rotational dynamics estimation can be applied to any other tumbling body, given sufficiently accurate observations.

Takahashi, Yu; Scheeres, D. J. [University of Colorado at Boulder, 429 UCB, Boulder, CO 80309-0429 (United States); Busch, Michael W. [National Radio Astronomy Observatory, 1003 Lopezville Road, Box O, Socorro, NM 87801 (United States)

2013-10-01T23:59:59.000Z

193

Quantum Geometry Phenomenology: Angle and Semiclassical States  

E-Print Network [OSTI]

The phenomenology for the deep spatial geometry of loop quantum gravity is discussed. In the context of a simple model of an atom of space, it is shown how purely combinatorial structures can affect observations. The angle operator is used to develop a model of angular corrections to local, continuum flat-space 3-geometries. The physical effects involve neither breaking of local Lorentz invariance nor Planck scale suppression, but rather reply on only the combinatorics of SU(2) recouping theory. Bhabha scattering is discussed as an example of how the effects might be observationally accessible.

Seth A. Major

2011-12-19T23:59:59.000Z

194

Assessing recovery from acidification of European surface waters in the year 2010:An evaluation of projections made with the MAGIC model in 1995  

Science Journals Connector (OSTI)

In 1999 we used the MAGIC (Model of Acidification of Groundwater In Catchments) model to project acidification of acid-sensitive European surface waters in the year 2010, given implementation of the Gothenburg Protocol to the Convention on Long-Range Transboundary Air Pollution (LRTAP). ...

Rachel Clare Helliwell; Richard F. Wright; Leah A. Jackson-Blake; Robert C. Ferrier; Julian Aherne; Bernard Jack Cosby; Christopher D. Evans; Martin Forsius; Jakub Hruska; Alan Jenkins; Pavel Krám; Jiri Kopacek; Vladimir Majer; Filip Moldan; Maximilian Posch; Jacqueline Potts; Michela Rogora; Wolfgang Schoepp

2014-10-17T23:59:59.000Z

195

Spin-bus concept of spin quantum computing  

SciTech Connect (OSTI)

We present a spin-bus concept of quantum computing where an electron spin S=1/2 acts as a bus qubit connected to a finite number N of nuclear spins I=1/2 serving as client qubits. Spin-bus clusters are considered as local processing units and may be interconnected with other spin-bus clusters via electron-electron coupling in a scaled up version. Here we lay the ground for the basic functional unit with long qubit registers, provide the theory and experimental verification of correlated qubit states, and demonstrate the Deutsch algorithm. Experiments were performed on a qubyte plus one nuclear spin in a solid state system.

Mehring, Michael; Mende, Jens [2. Physikalisches Institut, University of Stuttgart (Germany)

2006-05-15T23:59:59.000Z

196

Room temperature ferromagnetism in magic-sized Cr-doped CdS diluted magnetic semiconducting quantum dots  

Science Journals Connector (OSTI)

Manipulation of carrier spins in semiconductors for spintronics applications has received great attention driven by improved functionalities and higher speed operation. Doping of semiconductor nanocrystals by tra...

Punita Srivastava; Pushpendra Kumar; Kedar Singh

2011-10-01T23:59:59.000Z

197

Small Angle X-ray Scattering (SAXS) Laboratory Learning Experiences  

E-Print Network [OSTI]

.A. & Svergun D.I. (1987). Structure Analysis by Small-Angle X-Ray and Neutron Scattering. NY: Plenum PressSmall Angle X-ray Scattering (SAXS) Laboratory Learning Experiences o - Use of small angle X-ray scattering instrumentation o - Programs that you will use SAXS (BRUKER AXS) PRIMUS (Konarev, Volkov, Koch

Meagher, Mary

198

Characterization of Metallurgical Chars by Small Angle Neutron Scattering  

Science Journals Connector (OSTI)

Characterization of Metallurgical Chars by Small Angle Neutron Scattering ... Small angle scattering measures the intensity I(q) of scattered neutrons as a function of scattering angle ? from the input beam, or alternatively, as a function of the scattering vector q:? q = |q| = (4?/?) sin(?/2), where ? is the wavelength of the incident wave. ...

I. Snook; I. Yarovsky; H. J. M. Hanley; M. Y. Lin; D. Mainwaring; H. Rogers; P. Zulli

2002-08-06T23:59:59.000Z

199

Cosmic Ray Pitch Angle Scattering Through 90 o  

E-Print Network [OSTI]

Cosmic Ray Pitch Angle Scattering Through 90 o G.M. Felice 1 and R.M. Kulsrud 2 Princeton Plasma­ lar attention to the problem of particle scattering through the # = cos -1 (v # /v) = 90 o pitch angle their pitch angle by mirror interaction with long wavelength waves generated by the # # 0 particles. We match

200

Small angle neutron scattering and small angle X-ray scattering studies of platinum-loaded carbon foams  

Science Journals Connector (OSTI)

The morphology of carbon nanofoam samples comprising platinum nanoparticles dispersed in the matrix was characterized by small angle neutron scattering (SANS) and small angle X-ray scattering (SAXS) techniques. R...

P. U. Sastry; V. K. Aswal; A. G. Wagh

2008-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "magic angle spinning" 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

Spin squeezing in the Ising model  

Science Journals Connector (OSTI)

We analyze the collective spin noise in interacting spin systems. General expressions are derived for the short-time behavior of spin systems with general spin-spin interactions, and we suggest optimum experimental conditions for the detection of spin squeezing. For Ising models with site-dependent nearest-neighbor interactions, general expressions are presented for the spin squeezing parameter for all times. The reduction of collective spin noise can be used to verify the entangling powers of quantum computer architectures based on interacting spins.

Xiaoguang Wang; Anders Søndberg Sørensen; Klaus Mølmer

2001-10-12T23:59:59.000Z

202

Hidden pseudospin and spin symmetries and their origins in atomic nuclei  

E-Print Network [OSTI]

Symmetry plays a fundamental role in physics. The quasi-degeneracy between single-particle orbitals $(n, l, j = l + 1/2)$ and $(n-1, l + 2, j = l + 3/2)$ indicates a hidden symmetry in atomic nuclei, the so-called pseudospin symmetry (PSS). Since the introduction of the concept of PSS in atomic nuclei, there have been comprehensive efforts to understand its origin. Both splittings of spin doublets and pseudospin doublets play critical roles in the evolution of magic numbers in exotic nuclei discovered by modern spectroscopic studies with radioactive ion beam facilities. Since the PSS was recognized as a relativistic symmetry in 1990s, many special features, including the spin symmetry (SS) for anti-nucleon, and many new concepts have been introduced. In the present Review, we focus on the recent progress on the PSS and SS in various systems and potentials, including extensions of the PSS study from stable to exotic nuclei, from non-confining to confining potentials, from local to non-local potentials, from central to tensor potentials, from bound to resonant states, from nucleon to anti-nucleon spectra, from nucleon to hyperon spectra, and from spherical to deformed nuclei. Open issues in this field are also discussed in detail, including the perturbative nature, the supersymmetric representation with similarity renormalization group, and the puzzle of intruder states.

Haozhao Liang; Jie Meng; Shan-Gui Zhou

2014-11-25T23:59:59.000Z

203

Molecular spinning by a chiral train of short laser pulses  

E-Print Network [OSTI]

We provide a detailed theoretical analysis of molecular rotational excitation by a chiral pulse train -- a sequence of linearly polarised pulses with the polarisation direction rotating from pulse to pulse by a controllable angle. Molecular rotation with a preferential rotational sense (clockwise or counter-clockwise) can be excited by this scheme. We show that the directionality of the rotation is caused by quantum interference of different excitation pathways. The chiral pulse train is capable of selective excitation of molecular isotopologues and nuclear spin isomers in a mixture. We demonstrate this using 14N2 and 15N2 as examples for isotopologues, and para- and ortho-nitrogen as examples for nuclear spin isomers.

Johannes Floß; Ilya Sh. Averbukh

2012-10-31T23:59:59.000Z

204

Quantization of Spin-2 Fields  

Science Journals Connector (OSTI)

A massive spin-2 field has been quantized using Schwinger's action principle. Lorentz invariance and physical positive-definiteness requirements have been verified.

Shau-jin Chang

1966-08-26T23:59:59.000Z

205

Eastern Interconnection Phase Angle Base Lining Study  

Broader source: Energy.gov (indexed) [DOE]

bhargava@electricpowergroup.com June 27-28, 2013 Washington, DC DOE/OE Transmission Reliability Program Topics  Project objective  Major technical accomplishments that will be completed this year-stage in RD&D cycle  Deliverables and schedule for activities to be completed under FY13 funding  Risk factors affecting timely completion of planned activities as well as movement through RD&D cycle  Early thoughts on follow-on work that should be considered for funding in FY14 Project Objective  Operators monitor power flows at specific interchange points (such as Keystone-Juniata). However, power flows may not be a good measure of wide area system stress  Phasor networks provide the capability to monitor phase angle

206

Determination of the Pt spin diffusion length by spin-pumping and spin Hall effect  

SciTech Connect (OSTI)

The spin diffusion length of Pt at room temperature and at 8 K is experimentally determined via spin pumping and spin Hall effect in permalloy/Pt bilayers. Voltages generated during excitation of ferromagnetic resonance from the inverse spin Hall effect and anisotropic magnetoresistance effect were investigated with a broadband approach. Varying the Pt layer thickness gives rise to an evolution of the voltage line shape due to the superposition of the above two effects. By studying the ratio of the two voltage components with the Pt layer thickness, the spin diffusion length of Pt can be directly extracted. We obtain a spin diffusion length of ?1.2 nm at room temperature and ?1.6 nm at 8 K.

Zhang, Wei; Pearson, John E.; Hoffmann, Axel [Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)] [Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States); Vlaminck, Vincent [Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States) [Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States); Colegio de Ciencias e Ingenería, Universidad San Fransciso de Quito, Quito (Ecuador); Divan, Ralu [Center for Nanoscale Materials, Argonne National Laboratory, Illinois 60439 (United States)] [Center for Nanoscale Materials, Argonne National Laboratory, Illinois 60439 (United States); Bader, Samuel D. [Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States) [Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States); Center for Nanoscale Materials, Argonne National Laboratory, Illinois 60439 (United States)

2013-12-09T23:59:59.000Z

207

Mesoscopic Spin Magnetism  

Science Journals Connector (OSTI)

We investigate the spin magnetism of mesoscopic metallic grains. In the average response of an ensemble of grains there are corrections to macroscopic behavior due to both spectral fluctuations and electron-electron interactions. These corrections are a nonlinear function of the magnetic field. Their temperature dependence is calculated numerically and analytically. An experiment is proposed to measure the unknown interaction coupling constant in the Cooper channel. For a single sample the magnetization is found to fluctuate reproducibly about the mean. These fluctuations directly probe the energy level statistics.

H. Mathur; M. Gökçeda?; A. Douglas Stone

1995-03-06T23:59:59.000Z

208

Spin-dependent Hall effect in a parabolic well with a quasi-three-dimensional electron gas G. M. Gusev, C. A. Duarte, A. A. Quivy, T. E. Lamas, and J. R. Leite*  

E-Print Network [OSTI]

dependent coefficient, and is the angle between the magnetic field and the normal to the well plane valve tran- sistor or other spintronic devices, however, the existence of such a spin-dependent property has not been studied yet in transport coefficients. Only the recently spin-related quantum Hall

Gusev, Guennady

209

THE SPIN ALIGNMENTS IN GALAXY PAIRS AS A TEST OF BOUNCING COUPLED DARK ENERGY  

SciTech Connect (OSTI)

We investigate the effect of coupled dark energy (cDE) on the spin alignments in isolated pairs of galactic halos using the publicly available data from the hydrodynamic cDE simulations (H-CoDECs) that were run for various cDE models such as EXP001, EXP002, EXP003 (with exponential potential and constant coupling), EXP008e3 (with exponential potential and exponential coupling), and SUGRA003 (with supergravity potential and negative constant coupling), as well as for a standard {Lambda}CDM cosmology (with the WMAP7 parameters). Measuring the cosines of the angles between the spin axes in isolated pairs of galactic halos for each model and determining its probability density distribution, we show that for the SUGRA003 model with bouncing cDE the null hypothesis of no spin alignment in pairs of galactic halos is rejected at a 99.999% confidence level. In contrast, the {Lambda}CDM cosmology yields no significant signal of spin alignment, and the other four cDE models also exhibit only weak signals of spin alignments. The strength of the spin alignment signal is found to be almost independent of the total halo mass and separation distance in galaxy pairs. Showing also that no signal is detected from the Sloan Digital Sky Survey DR 7, we conclude that the spin alignments in galaxy pairs are in principle a unique test of bouncing cDE models.

Lee, Jounghun, E-mail: jounghun@astro.snu.ac.kr [Department of Physics and Astronomy, Seoul National University, Seoul 151-747 (Korea, Republic of)

2012-06-01T23:59:59.000Z

210

Single spin asymmetries in QCD  

E-Print Network [OSTI]

Measurements of single transverse spin asymmetries in high energy inclusive processes have always shown unexpected and challenging results. Several cases are considered and discussed within a QCD approach which couples perturbative dynamics to new non perturbative partonic information; the aim is that of developing a consistent phenomenological description of these unusual single spin phenomena, based on a generalized QCD factorization scheme.

Mauro Anselmino

2002-01-16T23:59:59.000Z

211

An effectual template bank for the detection of gravitational waves from inspiralling compact binaries with generic spins  

E-Print Network [OSTI]

We report the construction of a three-dimensional template bank for the search for gravitational waves from inspiralling binaries consisting of spinning compact objects. The parameter space consists of two dimensions describing the mass parameters and one "reduced-spin" parameter, which describes the secular (non-precessing) spin effects in the waveform. The template placement is based on an efficient stochastic algorithm and makes use of the semi-analytical computation of a metric in the parameter space. We demonstrate that for "low-mass" ($m_1 + m_2 \\lesssim 12\\,M_\\odot$) binaries, this template bank achieves effective fitting factors $\\sim0.92$--$0.99$ towards signals from generic spinning binaries in the advanced detector era over the entire parameter space of interest (including binary neutron stars, binary black holes, and black hole-neutron star binaries). This provides a powerful and viable method for searching for gravitational waves from generic spinning low-mass compact binaries. Under the assumption that spin magnitudes of black-holes [neutron-stars] are uniformly distributed between 0--0.98 [0 -- 0.4] and spin angles are isotropically distributed, the expected improvement in the average detection volume (at a fixed signal-to-noise-ratio threshold) of a search using this reduced-spin bank is $\\sim20-52\\%$, as compared to a search using a non-spinning bank.

P. Ajith; N. Fotopoulos; S. Privitera; A. Neunzert; N. Mazumder; A. J. Weinstein

2014-05-21T23:59:59.000Z

212

Even spin minimal model holography  

E-Print Network [OSTI]

The even spin W^e_\\infty algebra that is generated by the stress energy tensor together with one Virasoro primary field for every even spin s \\geq 4 is analysed systematically by studying the constraints coming from the Jacobi identities. It is found that the algebra is characterised, in addition to the central charge, by one free parameter that can be identified with the self-coupling constant of the spin 4 field. We show that W^e_\\infty can be thought of as the quantisation of the asymptotic symmetry algebra of the even higher spin theory on AdS_3. On the other hand, W^e_\\infty is also quantum equivalent to the so(N) coset algebras, and thus our result establishes an important aspect of the even spin minimal model holography conjecture. The quantum equivalence holds actually at finite central charge, and hence opens the way towards understanding the duality beyond the leading 't Hooft limit.

Candu, Constantin; Kelm, Maximilian; Vollenweider, Carl

2012-01-01T23:59:59.000Z

213

Definition: Transmission Angle and Frequency Monitoring | Open Energy  

Open Energy Info (EERE)

Transmission Angle and Frequency Monitoring Transmission Angle and Frequency Monitoring Jump to: navigation, search Dictionary.png Transmission Angle and Frequency Monitoring An advanced transmission application that uses angle and frequency measurements from PMUs to indicate loss of generation or other disturbances causing a change in the supply/demand balance.[1] Related Terms transmission lines, advanced transmission applications, transmission line References ↑ https://www.smartgrid.gov/category/technology/transmission_angle_and_frequency_monitoring [[Cat LikeLike UnlikeLike You like this.Sign Up to see what your friends like. egory: Smart Grid Definitionssmart grid,smart grid, |Template:BASEPAGENAME]]smart grid,smart grid, Retrieved from "http://en.openei.org/w/index.php?title=Definition:Transmission_Angle_and_Frequency_Monitoring&oldid=502506

214

Definition: Phase Angle Regulating Transformer | Open Energy Information  

Open Energy Info (EERE)

Angle Regulating Transformer Angle Regulating Transformer Jump to: navigation, search Dictionary.png Phase Angle Regulating Transformer Transformers that enable phase-angle control between the primary (source) and the secondary (load) side to create a phase shift between the primary side voltage and the secondary side voltage. The purpose of this phase shift is to control the real power flow through interconnected power systems.[1] Also Known As phase angle regulating transformers (PARs) Related Terms transformer, real power, smart grid References ↑ [www.smartgrid.gov/sites/default/files/pdfs/description_of_assets.pdf SmartGrid.gov 'Description of Assets'] An in LikeLike UnlikeLike You like this.Sign Up to see what your friends like. line Glossary Definition Retrieved from "http://en.openei.org/w/index.php?title=Definition:Phase_Angle_Regulating_Transformer&oldid=502556"

215

Analytical investigation of collector optimum tilt angle at low latitude  

Science Journals Connector (OSTI)

An analytical investigation on the optimum tilt angle for solar collectors at low latitude a case study of Universiti Teknologi PETRONAS (UTP) 4.39°N and 100.98°E Malaysia is presented in this work. The study employed Hay Davies Klucher and Reindl (HDKR) anisotropic sky model to evaluate the available hourly solar radiation on inclined surface using the location metrological data. The tilt angles considered were 0° to 30° in step of 3° with the inclusion of the location latitude angle. The study employed the ratio of global solar radiation on tilted surface to the global solar radiation on horizontal surface in the decision of the optimum tilt. The system equations were converted to MATLAB codes to solve for the optimum tilt angles. The results show that the optimum tilt varies monthly but gave zero degree for south facing collector for the months of April to August; thus the investigation also considered north facing orientation for the months of April to September. The optimum annual tilt angle for the location using the tilt to horizontal radiation ratio was found to be equal to the location latitude angle. Using the conventional average of the monthly optimum tilt angles the annual optimum tilt angle was found to be 9.75° for south facing collector. Considering seasonal optimum tilt angle for the location using the tilt to horizontal radiation ratio 18° facing south was found to be the optimum tilt angle for rainy season (September to March) and 15° facing north for dry season (April to August). Employing the average of monthly optimum tilt method the seasonal optimum tilt angle was found to be 17° for rainy season and 12° facing north dry season. The effect of dust on the collector was considered with reference to literature and the annual tilt angle of 15° facing south was recommended for the location in the case of large solar collector that cannot be monthly or seasonally adjusted.

Ogboo Chikere Aja; Hussain H. Al-Kayiem; Zainal Ambri Abdul Karim

2013-01-01T23:59:59.000Z

216

Emission angle distribution and flavor transformation of supernova neutrinos  

E-Print Network [OSTI]

Using moment equations we analyze collective flavor transformation of supernova neutrinos. We study the convergence of moment equations and find that numerical results using a few moment converge quite fast. We study effects of emission angle distribution of neutrinos on neutrino sphere. We study scaling law of the amplitude of neutrino self-interaction Hamiltonian and find that it depends on model of emission angle distribution of neutrinos. Dependence of neutrino oscillation on different models of emission angle distribution is studied.

Wei Liao

2009-06-28T23:59:59.000Z

217

Superconducting magnetic Wollaston prism for neutron spin encoding  

SciTech Connect (OSTI)

A magnetic Wollaston prism can spatially split a polarized neutron beam into two beams with different neutron spin states, in a manner analogous to an optical Wollaston prism. Such a Wollaston prism can be used to encode the trajectory of neutrons into the Larmor phase associated with their spin degree of freedom. This encoding can be used for neutron phase-contrast radiography and in spin echo scattering angle measurement (SESAME). In this paper, we show that magnetic Wollaston prisms with highly uniform magnetic fields and low Larmor phase aberration can be constructed to preserve neutron polarization using high temperature superconducting (HTS) materials. The Meissner effect of HTS films is used to confine magnetic fields produced electromagnetically by current-carrying HTS tape wound on suitably shaped soft iron pole pieces. The device is cooled to ?30 K by a closed cycle refrigerator, eliminating the need to replenish liquid cryogens and greatly simplifying operation and maintenance. A HTS film ensures that the magnetic field transition within the prism is sharp, well-defined, and planar due to the Meissner effect. The spin transport efficiency across the device was measured to be ?98.5% independent of neutron wavelength and energizing current. The position-dependent Larmor phase of neutron spins was measured at the NIST Center for Neutron Research facility and found to agree well with detailed simulations. The phase varies linearly with horizontal position, as required, and the neutron beam shows little depolarization. Consequently, the device has advantages over existing devices with similar functionality and provides the capability for a large neutron beam (20 mm × 30 mm) and an increase in length scales accessible to SESAME to beyond 10 ?m. With further improvements of the external coupling guide field in the prototype device, a larger neutron beam could be employed.

Li, F., E-mail: fankli@indiana.edu; Parnell, S. R.; Wang, T.; Baxter, D. V. [Center for Exploration of Energy and Matter, Indiana University, Bloomington, Indiana 47408 (United States)] [Center for Exploration of Energy and Matter, Indiana University, Bloomington, Indiana 47408 (United States); Hamilton, W. A. [Neutron Sciences Directorate, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830 (United States)] [Neutron Sciences Directorate, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830 (United States); Maranville, B. B. [National Institute of Standards and Technology, Gaithersburg, Maryland 20899 (United States)] [National Institute of Standards and Technology, Gaithersburg, Maryland 20899 (United States); Semerad, R. [Ceraco Ceramic Coating GmbH, Ismaning 85737 (Germany)] [Ceraco Ceramic Coating GmbH, Ismaning 85737 (Germany); Cremer, J. T. [Adelphi Technology Inc., Redwood City, California 94063 (United States)] [Adelphi Technology Inc., Redwood City, California 94063 (United States); Pynn, R. [Center for Exploration of Energy and Matter, Indiana University, Bloomington, Indiana 47408 (United States) [Center for Exploration of Energy and Matter, Indiana University, Bloomington, Indiana 47408 (United States); Neutron Sciences Directorate, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830 (United States)

2014-05-15T23:59:59.000Z

218

Local Uniqueness for the Fixed Energy Fixed Angle Inverse Problem ...  

E-Print Network [OSTI]

Abstract. We prove local uniqueness for the inverse problem in obstacle scattering at a fixed energy and fixed incident angle. We consider the inverse problem of ...

219

Identification of high angle structures controlling the geothermal...  

Open Energy Info (EERE)

high angle structures controlling the geothermal system at Rye Patch, Nevada Jump to: navigation, search OpenEI Reference LibraryAdd to library Conference Paper: Identification of...

220

Critical angle refractometry and sizing of bubble clouds  

Science Journals Connector (OSTI)

The principle of the critical angle refractometry and sizing technique is extended to characterize the size distribution and the mean refractive index of clouds of bubbles. For a...

Onofri, Fabrice; Krysiek, Mariusz; Mroczka, Janusz

2007-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "magic angle spinning" 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

Small-angle scattering in a marginal Fermi liquid  

Science Journals Connector (OSTI)

We study the magnetotransport properties of a model of small-angle scattering in a marginal Fermi liquid. Such a model has been proposed by Varma and Abrahams [Phys. Rev. Lett. 86, 4652 (2001)] to account for the anomalous temperature dependence of in-plane magnetotransport properties of the high-Tc cuprates. We study the resistivity, Hall angle, and magnetoresistance using both analytical and numerical techniques. We find that small-angle scattering only generates a difference in temperature dependence between the inverse Hall angle and the resistivity near particle-hole symmetric Fermi surfaces where the conventional Hall term vanishes. The magnetoresistance always shows Kohler’s rule behavior.

E. C. Carter and A. J. Schofield

2002-12-17T23:59:59.000Z

222

The Waste Prevention War-- Small Arms Fire Now, but the Heavy Artillery is Coming (and the Search is on for Magic Bullets)  

E-Print Network [OSTI]

The Waste Prevention War Small Arms Fire Now, but the Heavy Artillery is Coming (and the Search Is on for Magic Bullets) Dan Steinmeyer Monsanto Company 51. louis, Missouri 'Wa.te Prevention' is unambiguous, as con trasted with 'waste... minimization' or 'waste elimination'. It means preventing the produc tion of waste. It isn't easy to do. Typically it requires major modification to the process: * to minimize byproduct formation to recover product and byproducts * to recycle wastes...

Steinmeyer, D.

223

doi:10.1016/S0016-7037(02)00026-7 The distribution of sodium ions in aluminosilicate glasses: A high-field Na-23 MAS and 3Q  

E-Print Network [OSTI]

of Geological and Environmental Sciences, Stanford University, Stanford, CA 94305-2115, USA (Received May 22-SiO2 join) and its distribution using 23 Na magic-angle spinning (MAS) nuclear magnetic resonance) because of the reduced effect of second-order quadrupolar interaction, and 23 Na MAS NMR spectra thus

Puglisi, Joseph

224

CP-MAS13C Nuclear Magnetic Resonance Spectra for Identification of Functionality of Octadecylsilica Bonded Phases  

Science Journals Connector (OSTI)

......December 1989 research-article Articles CP-MAS13C Nuclear Magnetic Resonance Spectra...Technology, Toyohashi Cross-polarization (CP) and magic angle spinning (MAS) carbon-13...Chromatographic Science, Vol. 27, December 1989 CP-MAS13 C Nuclear Magnetic Resonance Spectra......

Kiyokatsu Jinno

1989-12-01T23:59:59.000Z

225

Water-Protein Interactions of an Arginine-Rich Membrane Peptide in Lipid Bilayers Investigated by Solid-State Nuclear Magnetic Resonance Spectroscopy  

E-Print Network [OSTI]

from water to proteins.1 For microcrystalline proteins in the solid-state, magic-angle- spinning (MASWater-Protein Interactions of an Arginine-Rich Membrane Peptide in Lipid Bilayers Investigated by Solid-State Nuclear Magnetic Resonance Spectroscopy Shenhui Li, Yongchao Su, Wenbin Luo, and Mei Hong

Hong, Mei

226

{sup 17}O NMR investigations of oxidative degradation in polymers  

SciTech Connect (OSTI)

We have initiated studies using both solution and solid state magic angle spinning {sup 17}O NMR for a series of oxidatively aged polymers. This short note reports the solution {sup 17}O NMR for oxidatively degraded polypropylene, ethylene-propylene-diene, polyisoprene, and nitrile rubber. Enriched O{sub 2} is used during the accelerated aging. 3 figs, 7 refs.

Alam, T.M.; Celina, M.; Assink, R.A.; Gillen, K.T.; Clough, R.L.

1996-12-31T23:59:59.000Z

227

Tetraphosphine Linker Scaffolds with a Tetraphenyltin Core for Superior Immobilized Catalysts: A Solid-State NMR Study  

E-Print Network [OSTI]

-resolution magic angle spinning) NMR spectra of several phosphonium salts, adsorbed on SiO2, have been studied. This technique allows one to probe the leaching and mobility of the linkers on the surface. The mobilities of the linkers and the catalysts are crucial...

Perera, Melanie Ingrid

2012-10-19T23:59:59.000Z

228

Tetrahedral boron in naturally occurring tourmaline  

SciTech Connect (OSTI)

Evidence for boron in both trigonal and tetrahedral coordination has been found in {sup 11}B magic-angle-spinning (MAS) nuclear magnetic resonance (NMR) spectra of natural, inclusion-free specimens of aluminum-rich lithian tourmaline from granitic pregmatites.

Tagg, S.L.; Cho, H. [Pacific Northwest National Lab., Richland, WA (United States). Environmental Molecular Sciences Lab.; Dyar, M.D. [Mount Holyoke Coll., South Hadley, MA (United States). Dept. of Geology and Geography; Grew, E.S. [Univ. of Maine, Orono, ME (United States). Dept. of Geological Sciences

1999-09-01T23:59:59.000Z

229

Spin-Asymmetric Josephson Effect  

SciTech Connect (OSTI)

We propose that with ultracold Fermi gases one can realize a spin-asymmetric Josephson effect in which the two spin components of a Cooper pair are driven asymmetrically - corresponding to driving a Josephson junction of two superconductors with different voltages V{sub {up_arrow}} and V{sub {down_arrow}} for spin up and down electrons, respectively. We predict that the spin up and down components oscillate at the same frequency but with different amplitudes. Furthermore our results reveal that the standard interpretation of the Josephson supercurrent in terms of coherent bosonic pair tunneling is insufficient. We provide an intuitive interpretation of the Josephson supercurrent as interference in Rabi oscillations of pairs and single particles, the latter causing the asymmetry.

Heikkinen, M. O. J.; Massel, F.; Kajala, J.; Leskinen, M. J.; Toermae, P. [Department of Applied Physics, Aalto University School of Science and Technology, P.O.Box 15100, FI-00076 Aalto (Finland); Paraoanu, G. S. [Low Temperature Laboratory, Aalto University School of Science and Technology, P.O.Box 15100, FI-00076 Aalto (Finland)

2010-11-26T23:59:59.000Z

230

Spinning disk for compressive imaging  

Science Journals Connector (OSTI)

We report the first, to the best of our knowledge, experimental implementation of a spinning-disk configuration for high-speed compressive image acquisition. A single rotating mask...

Shen, H; Gan, L; Newman, N; Dong, Y; Li, C; Huang, Y; Shen, Y C

2012-01-01T23:59:59.000Z

231

Spin Tests for the ?- Particle  

Science Journals Connector (OSTI)

Spin tests for ?- produced in the reaction p+p¯??-+?¯+ are proposed. The tests are in the form of a set of inequalities satisfied by the angular distributions of the decay products.

Y. Dothan

1965-02-08T23:59:59.000Z

232

Optimum tilt angle and orientation for solar collectors in Syria  

Science Journals Connector (OSTI)

One of the important parameters that affect the performance of a solar collector is its tilt angle with the horizon. This is because of the variation of tilt angle changes the amount of solar radiation reaching the collector surface. A mathematical model was used for estimating the solar radiation on a tilted surface, and to determine the optimum tilt angle and orientation (surface azimuth angle) for the solar collector in the main Syrian zones, on a daily basis, as well as for a specific period. The optimum angle was computed by searching for the values for which the radiation on the collector surface is a maximum for a particular day or a specific period. The results reveal that changing the tilt angle 12 times in a year (i.e. using the monthly optimum tilt angle) maintains approximately the total amount of solar radiation near the maximum value that is found by changing the tilt angle daily to its optimum value. This achieves a yearly gain in solar radiation of approximately 30% more than the case of a solar collector fixed on a horizontal surface.

Kamal Skeiker

2009-01-01T23:59:59.000Z

233

Momentum Map and Action-Angle Variables for Nambu Dynamics  

E-Print Network [OSTI]

Momentum map is a reduction procedure that reduces the dimension of a Hamiltonian system to the lower ones. It is shown that behavior of the action-angle variables under the momentum map generates the new action-angle variables for the reduced system considered as a Nambu structure. The symmetrical top is given as an illustration.

A. Tegmen

2005-08-29T23:59:59.000Z

234

RisR1084(EN) Small Angle Neutron Scat-  

E-Print Network [OSTI]

#12;Abstract This thesis describes small angle neutron scattering studies of the flux line latticeRisø­R­1084(EN) Small Angle Neutron Scat- tering Studies of the Flux Line Lattices in the Boro. As the field is increased the magnetic structure is modified, signalled by the appearence of additional neutron

235

Steiner Minimal Trees, Twist Angles, and the Protein Folding Problem  

E-Print Network [OSTI]

Steiner Minimal Trees, Twist Angles, and the Protein Folding Problem J. MacGregor Smith, Yunho Jang. These properties should be ultimately useful in the ab ini- tio protein folding prediction. Proteins 2007;66:889­ 902. VVC 2006 Wiley-Liss, Inc. Key words: Steiner trees; twist angles; protein fold- ing; side chain

Smith, J. MacGregor

236

Constrained sinogram restoration for limited-angle Jerry L. Prince  

E-Print Network [OSTI]

for further re- search. Subject terms: image reconstruction; computed tomography; regularization; limitedConstrained sinogram restoration for limited-angle tomography Jerry L. Prince The Johns Hopkins-437 Cambridge, Massachusetts 02139 CONTENTS 1. Introduction 2. Limited-angle tomography 3. Sinogram restoration

Willsky, Alan S.

237

Contact angles in the pseudopotential lattice Boltzmann modeling of wetting  

E-Print Network [OSTI]

In this paper, we aim to investigate the implementation of contact angles in the pseudopotential lattice Boltzmann modeling of wetting at a large density ratio. The pseudopotential lattice Boltzmann model [X. Shan and H. Chen, Phys. Rev. E 49, 2941 (1994)] is a popular mesoscopic model for simulating multiphase flows and interfacial dynamics. In this model, the contact angle is usually realized by a fluid-solid interaction. Two widely used fluid-solid interactions: the density-based interaction and the pseudopotential-based interaction, as well as a modified pseudopotential-based interaction formulated in the present paper, are numerically investigated and compared in terms of the achievable contact angles, the maximum and the minimum densities, and the spurious currents. It is found that the pseudopotential-based interaction works well for simulating small static (liquid) contact angles, however, is unable to reproduce static contact angles close to 180 degrees. Meanwhile, it is found that the proposed modif...

Li, Q; Kang, Q J; Chen, Q

2014-01-01T23:59:59.000Z

238

THE MAGELLANIC INTER-CLOUD PROJECT (MAGIC). I. EVIDENCE FOR INTERMEDIATE-AGE STELLAR POPULATIONS IN BETWEEN THE MAGELLANIC CLOUDS  

SciTech Connect (OSTI)

The origin of the gas in between the Magellanic Clouds (MCs)-known as the ''Magellanic Bridge'' (MB)-is puzzling. Numerical simulations suggest that the MB formed from tidally stripped gas and stars in a recent interaction between the MCs. However, the apparent lack of stripped intermediate- or old-age stars associated with the MB is at odds with this picture. In this paper, we present the first results from the MAGellanic Inter-Cloud program (MAGIC) aimed at probing the stellar populations in the inter-Cloud region. We present observations of the stellar populations in two large fields located in between the Large and Small Magellanic Clouds (LMC/SMC), secured using the WFI camera on the 2.2 m telescope in La Silla. Using a synthetic color-magnitude diagram technique, we present the first quantitative evidence for the presence of intermediate-age and old stars in the inter-Cloud region. The intermediate-age stars-which make up {approx}28% of all stars in the region-are not present in fields at a similar distance from the SMC in a direction pointing away from the LMC. This provides potential evidence that these intermediate-age stars could have been tidally stripped from the SMC. However, spectroscopic studies will be needed to confirm or rule out the tidal origin for the inter-Cloud gas and stars.

Noeel, N. E. D.; Read, J. I. [ETH Zuerich, Institute for Astronomy, Wolfgang-Pauli-Strasse 27, CH-8093 Zuerich (Switzerland); Conn, B. C.; Rix, H.-W. [Max Planck Institut fuer Astronomie, Koenigstuhl 17, D-69117, Heidelberg (Germany); Carrera, R. [Instituto de Astrofisica de Canarias, C/Via Lactea s/n, E-38200, La Laguna, Tenerife (Spain); Dolphin, A., E-mail: noelia@phys.ethz.ch [Raytheon Company, P.O. Box 11337, Tucson, AZ 85734-1337 (United States)

2013-05-10T23:59:59.000Z

239

Spectroscopy of few-particle nuclei around magic {sup 132}Sn from fission product {gamma}-ray studies.  

SciTech Connect (OSTI)

We are studying the yrast structure of very neutron-rich nuclei around doubly magic {sup 132}Sn by analyzing fission product {gamma}-ray data from a {sup 248}Cm source at Eurogam II. Yrast cascades in several few-valence-particle nuclei have been identified through {gamma}{gamma} cross coincidences with their complementary fission partners. Results for two-valence-particle nuclei {sup 132}Sb, {sup 134}Te, {sup 134}Sb and {sup 134}Sn provide empirical nucleon-nucleon interactions which, combined with single-particle energies already known in the one-particle nuclei, are essential for shell-model analysis in this region. Findings for the N = 82 nuclei {sup 134}Te and {sup 135}I have now been extended to the four-proton nucleus {sup 136}Xe. Results for the two-neutron nucleus {sup 134}Sn and the N = 83 isotones {sup 134}Sb, {sup 135}Te and {sup 135}I open up the spectroscopy of nuclei in the northeast quadrant above {sup 132}Sn.

Zhang, C. T.

1998-07-29T23:59:59.000Z

240

A More Informative Approach for Characterization of Polymer Monolithic Phases: Small Angle Neutron Scattering/Ultrasmall Angle Neutron Scattering  

Science Journals Connector (OSTI)

A More Informative Approach for Characterization of Polymer Monolithic Phases: Small Angle Neutron Scattering/Ultrasmall Angle Neutron Scattering ... Scattered neutrons were detected with a 64 cm × 64 cm two-dimensional position sensitive detector with 128 × 128 pixels and 0.5 cm resolution per pixel. ...

Kathleen M. Ford; Brian G. Konzman; Judith F. Rubinson

2011-11-08T23:59:59.000Z

Note: This page contains sample records for the topic "magic angle spinning" 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.


241

Spin pumping and spin filtering in double quantum dots with time-dependent spin-orbit interactions  

Science Journals Connector (OSTI)

We propose a scheme of realizing both spin pumping and spin filtering in a double quantum dot with homogeneous Zeeman splittings in the presence of oscillating spin-orbit interactions. We find that a spin-polarized pumping current can be achieved by tuning the relative energies of the Zeeman-split levels of the dots. It is also found that a pure spin current can be generated at zero detuning whose magnitude can be modulated by the external fields. At a certain constellation of system parameters the pumping current can become almost fully spin-polarized. Therefore it is possible to select a particular spin component of the current to be pumped from the left to the right lead. We finally give some discussions on the realization of the spin pumping and spin filtering effects.

Hui Pan; Yinghui Zhao

2012-01-01T23:59:59.000Z

242

Probing the Short Range Spin Dependent Interactions by Polarized $^{3}He$ Atom Beams  

E-Print Network [OSTI]

Experiments using polarized $^{3}He$ atom beams to search for short range spin dependent forces are proposed. High intensity, high polarization, small beam size $^{3}He$ atom beams have been successfully produced and used in surface science researches. By incorporating background reduction designs as combination shielding by $\\mu$-metal and superconductor and double beam pathes, the precision of spin rotation angle per unit length could be improved by a factor of $\\sim10^{4}$. By this precision, in combination with using a high density and low magnetic susceptibility sample source mass,and reversing one beam path if necessary, sensitivities on three different types of spin dependent interactions could be possibly improved by as much as $\\sim10^{2}$ to $\\sim10^{8}$ over the current experiments at the millimeter range.

Yan, H

2014-01-01T23:59:59.000Z

243

Probing the Short Range Spin Dependent Interactions by Polarized $^{3}He$ Atom Beams  

E-Print Network [OSTI]

Experiments using polarized $^{3}He$ atom beams to search for short range spin dependent forces are proposed. High intensity, high polarization, small beam size $^{3}He$ atom beams have been successfully produced and used in surface science researches. By incorporating background reduction designs as combination shielding by $\\mu$-metal and superconductor and double beam pathes, the precision of spin rotation angle per unit length could be improved by a factor of $\\sim10^{4}$. By this precision, in combination with using a high density and low magnetic susceptibility sample source mass,and reversing one beam path if necessary, sensitivities on three different types of spin dependent interactions could be possibly improved by as much as $\\sim10^{2}$ to $\\sim10^{8}$ over the current experiments at the millimeter range.

H. Yan

2014-07-22T23:59:59.000Z

244

Antiferromagnetic spin excitations in single crystals of nonsuperconducting Li$_{1-x}$FeAs  

SciTech Connect (OSTI)

We use neutron scattering to determine spin excitations in single crystals of nonsuperconducting Li1 xFeAs throughout the Brillouin zone. Although angle resolved photoemission experiments and local density approximation calculations suggest poor Fermi surface nesting conditions for antiferromagnetic (AF) order, spin excitations in Li1 xFeAs occur at the AF wave vectors Q = (1,0) at low energies, but move to wave vectors Q = ( 0.5, 0.5) near the zone boundary with a total magnetic bandwidth comparable to that of BaFe2As2. These results reveal that AF spin excitations still dominate the low-energy physics of these materials and suggest both itinerancy and strong electron-electron correlations are essential to understand the measured magnetic excitations.

Wang, Meng [ORNL; Wang, X.C. [Beijing National Laboratory for Condensed Matter Physics/Chinese Academy of Scie; Abernathy, Douglas L [ORNL; Harriger, Leland W [ORNL; Luo, H.Q. [Beijing National Laboratory for Condensed Matter Physics, Institute of Physics; Zhao, Yang [ORNL; Lynn, J. W. [National Institute of Standards and Technology (NIST); Liu, Q.Q. [Beijing National Laboratory for Condensed Matter Physics, Institute of Physics; Jin, C.Q. [Beijing National Laboratory for Condensed Matter Physics, Institute of Physics; Fang, Chen [Purdue University; Hu, Jiangping [Purdue University and Chinese Academy of Sciences; Dai, Pengcheng [University of Tennessee, Knoxville (UTK)

2011-01-01T23:59:59.000Z

245

Neutron scattering studies of spin excitations in superconducting Rb0.82Fe1.68Se2  

SciTech Connect (OSTI)

We use inelastic neutron scattering to show that superconducting (SC) rubidium iron selenide Rb0.82Fe1.68Se2 exhibits antiferromagnetic (AF) spin excitations near the in-plane wave vector Q = ( ,0) identical to that for iron arsenide superconductors. Moreover, we find that these excitations change from incommensurate to commensurate with increasing energy and occur at the expense of spin waves associated with the coexisting 5 5 block AF phase. Since these spin excitations cannot come from Fermi surface nesting based on angle resolved photoemission experiments, our results indicate the presence of local moments in SC Rb0.82Fe1.68Se2 that may have a similar origin as the hourglass-like spin excitations in copper oxide superconductors.

Wang, Miaoyin [University of Tennessee, Knoxville (UTK); Li, Chunhong [The Institute of Physics, Chinese Academy of Sciences; Abernathy, Douglas L [ORNL; Song, Yu [University of Tennessee, Knoxville (UTK); Carr, Scott V. [University of Tennessee, Knoxville (UTK); Lu, Xiangye [The Institute of Physics, Chinese Academy of Sciences; Li, Shiliang [The Institute of Physics, Chinese Academy of Sciences; Yamari, Zahra [Canadian Neutron Beam Centre, National Research Council, Chalk River Laboratorie; Hu, Jiangping [Purdue University and Chinese Academy of Sciences; Xiang, Tao [The Institute of Physics, Chinese Academy of Sciences; Dai, Pengcheng [University of Tennessee, Knoxville (UTK)

2012-01-01T23:59:59.000Z

246

Small-Angle Proton-Proton Scattering at 20 Mev  

Science Journals Connector (OSTI)

The differential cross section for the scattering of 19.8-Mev protons by protons has been measured for angles between 18° and 35° in the center-of-mass system, detection being by photographic emulsion placed in a scattering camera. Cross sections were measured simultaneously at all angles and azimuths. A run with analyzing slits closed served to evaluate the small slit-edge correction. The accuracy of the cross-section measurements is approximately 2.5% at all angles except 18°, where the accuracy is about 3%.

Herbert N. Royden and Byron T. Wright

1959-01-01T23:59:59.000Z

247

The influence of naturally-occurring organic acids on model estimates of lakewater acidification using the model of acidification of groundwater in catchments (MAGIC). Summary of research conducted during year 1  

SciTech Connect (OSTI)

A project for the US Department of Energy, entitled ``Incorporation of an organic acid representation into MAGIC (Model of Acidification of Groundwater in Catchments) and Testing of the Revised Model UsingIndependent Data Sources`` was initiated by E&S Environmental Chemistry, Inc. in March, 1992. Major components of the project include: improving the MAGIC model by incorporating a rigorous organic acid representation, based on empirical data and geochemical considerations, and testing the revised model using data from paleolimnological hindcasts of preindustrial chemistry for 33 Adirondack Mountain lakes, and the results of whole-catchment artificial acidification projects in Maine and Norway. The ongoing research in this project involves development of an organic acid representation to be incorporated into the MAGIC modeland testing of the improved model using three independent data sources. The research during Year 1 has included conducting two workshops to agree on an approach for the organic acid modeling, developing the organic subroutine and incorporating it into MAGIC (Task 1), conducing MAGIC hindcasts for Adirondack lakes and comparing the results with paleolimnological reconstructions (Task 2), and conducting site visits to the manipulation project sites in Maine and Norway. The purpose of this report is to provide a summary of the work that has been conducted on this project during Year 1. Tasks 1 and 2 have now been completed.

Sullivan, T.J.; Eilers, J.M. [E and S Environmental Chemistry, Inc., Corvallis, OR (United States)] [E and S Environmental Chemistry, Inc., Corvallis, OR (United States); Cosby, B.J. [Virginia Univ., Charlottesville, VA (United States). Dept. of Environmental Sciences] [Virginia Univ., Charlottesville, VA (United States). Dept. of Environmental Sciences; Driscoll, C.T. [Syracuse Univ., NY (United States). Dept. of Civil Engineering] [Syracuse Univ., NY (United States). Dept. of Civil Engineering; Hemond, H.F. [Massachusetts Inst. of Tech., Cambridge, MA (United States). Dept. of Civil Engineering] [Massachusetts Inst. of Tech., Cambridge, MA (United States). Dept. of Civil Engineering; Charles, D.F. [Academy of Natural Sciences of Philadelphia, PA (United States). Patrick Center for Environmental Research] [Academy of Natural Sciences of Philadelphia, PA (United States). Patrick Center for Environmental Research; Norton, S.A. [Maine Univ., Orono, ME (United States). Dept. of Geological Sciences] [Maine Univ., Orono, ME (United States). Dept. of Geological Sciences

1993-03-05T23:59:59.000Z

248

Spin dynamics in the strong spin-orbit coupling regime  

E-Print Network [OSTI]

PHYSICAL REVIEW B 84, 035318 (2011) Spin dynamics in the strong spin-orbit coupling regime Xin Liu,1 Xiong-Jun Liu,1 and Jairo Sinova1,2 1Department of Physics, Texas A&M University, College Station, Texas 77843-4242, USA 2Institute of Physics... frequency #2;so take the form: H so = (?1 ? 2?3 cos 2? )kx?y + (?2 + 2?3 cos 2? )ky?x, (5) where ?1 = ? + ?1 and ?2 = ?1 ? ?. 035318-11098-0121/2011/84(3)/035318(8) 2011 American Physical Society XIN LIU, XIONG-JUN LIU, AND JAIRO SINOVA PHYSICAL REVIEW B...

Liu, Xin; Liu, Xiong-Jun; Sinova, Jairo.

2011-01-01T23:59:59.000Z

249

Sum rules for spin-$1/2$ quantum gases in well-defined-spin states: spin-independent interactions and spin-dependent external fields  

E-Print Network [OSTI]

Many-body eigenstates of spin-$1/2$ particles with defined total spins contain spin and spatial wavefunctions belonging to multidimensional irreducible representations of the symmetric group, unless the total spin has the maximal allowed value. Matrix elements in the basis of such eigenstates are analyzed for spin-dependent interactions with external fields and spin-independent ones between the particles. Analytical expressions are obtained for sums of the matrix elements and sums of their squared modules. The sum rules are applied to perturbative analysis of energy spectra.

Yurovsky, Vladimir A

2015-01-01T23:59:59.000Z

250

Aspherical refractive lenses for small-angle neutron scattering  

Science Journals Connector (OSTI)

This paper discusses the testing and simulation of aspherical neutron lenses as focusing elements for small-angle neutron scattering and their transparency with respect to thermal diffuse scattering.

Frielinghaus, H.

2009-06-20T23:59:59.000Z

251

A bulk-flow model of angled injection Lomakin bearings  

E-Print Network [OSTI]

A bulk-flow model for determination of the leakage and dynamic force characteristics of angled injection Lomakin bearings is presented. Zeroth- and first-order equations describe the equilibrium flow for a centered bearing and the perturbed flow...

Soulas, Thomas Antoine Theo

2001-01-01T23:59:59.000Z

252

Measurements of the CKM Angle Gamma at BaBar  

SciTech Connect (OSTI)

We present a short review of the measurements of the CKM angle {gamma} performed by the BABAR experiment. We focus on methods using charged B decays, which give a direct access to {gamma} and provide the best constraints so far.

Latour, Emmanuel; /Ecole Polytechnique

2007-10-02T23:59:59.000Z

253

Angle Instability Detection in Power Systems with High Wind Penetration  

Broader source: Energy.gov (indexed) [DOE]

Angle Instability Detection in Power Angle Instability Detection in Power Systems with High Wind Penetration Using PMUs YC Zhang National Renewable Energy Laboratory Yingchen.zhang@nrel.gov 27/28 June 2013 Washington, DC DOE/OE Transmission Reliability Program Angle Instability Detection in Power Systems with High Wind Penetration Using Synchrophasor Measurements  Project Objective * Utilize synchrophasor measurements to estimate the equivalent inertia of a power source such as synchronous generators or wind turbine generators * Develop angle instability detection method for a system with high wind penetration using the synchrophasor measurements 2 3 Background Submitted to IEEE Journal of Emerging and Selected Topics in Power Electronics * In case of angular instability, some machines will have

254

Measurement of the CKM angle phi2 (alpha)  

E-Print Network [OSTI]

We present recent measurements of the unitarity triangle angle phi2(alpha) using B -> pi pi, B -> rho rho, and B -> rho pi decays. The measurements are based on data samples collected with the Belle and BaBar detectors at the KEKB and PEP-II e+e- colliders, respectively. We also report on a new measurement of a CP-violating asymmetry in B -> a_1+ pi- decay which will allow to constrain further the angle phi2.

A. Somov

2007-08-29T23:59:59.000Z

255

Nuclear spin and isospin excitations  

Science Journals Connector (OSTI)

A review is given of our present knowledge of collective spin-isospin excitations in nuclei. Most of this knowledge comes from intermediate-energy charge-exchange reactions and from inelastic electron- and proton-scattering experiments. The nuclear-spin dynamics is governed by the spin-isospin-dependent two-nucleon interaction in the medium. This interaction gives rise to collective spin modes such as the giant Gamow-Teller resonances. An interesting phenomenon is that the measured total Gamow-Teller transition strength in the resonance region is much less than a model-independent sum rule predicts. Two physically different mechanisms have been discussed to explain this so-called quenching of the total Gamow-Teller strength: coupling to subnuclear degrees of freedom in the form of ?-isobar excitation and ordinary nuclear configuration mixing. Both detailed nuclear structure calculations and extensive analyses of the scattering data suggest that the nuclear configuration mixing effect is the more important quenching mechanism, although subnuclear degrees of freedom cannot be ruled out. The quenching phenomenon occurs for nuclear-spin excitations at low excitation energies (??10-20 MeV) and small-momentum transfers (q?0.5 fm-1). A completely opposite effect is anticipated in the high (?, q)-transfer region (0???500 MeV, 0.5?q?3 fm-1). The nuclear spin-isospin response might be enhanced due to the attractive pion field inside the nucleus. Charge-exchange reactions at GeV incident energies have been used to study the quasifree peak region and the ?-resonance region. An interesting result of these experiments is that the ? excitation in the nucleus is shifted downwards in energy relative to the ? excitation of the free proton. The physical origin of this shift is discussed, and it is shown that it may be related to the energy-dependent, attractive one-pion exchange interaction in the medium.

Franz Osterfeld

1992-04-01T23:59:59.000Z

256

Local Structure of Phosphate/Amine Polyion Complexes in Phospholipid/Polypeptide Mixtures by Solid State NMR and ab Initio Chemical Shielding Calculation  

Science Journals Connector (OSTI)

The complete information about the 31P chemical shift tensor (CST), principal values of CST and the mutual orientation of CST with respect to a molecular fixed frame, for methylguanidinium dihydrogenorthophosphate (MGD/H2PO4), which is thought of as a model compound for DPPA/pARG, was determined by both cross-polarization and magic-angle sample spinning (CPMAS) and spin?echo separated local field (SLF) measurements under the magic-angle sample spinning (MAS). ... Pulse sequences for 31P?1H heteronuclear correlation (HETCOR) NMR (a) and spin?echo separated local field (SLF) measurements (b) in the solid state. ... 31P Separated Local Field (SLF) Measurements. ...

Naoki Asakawa; Daisuke Sato; Minoru Sakurai; Yoshio Inoue

2000-03-08T23:59:59.000Z

257

Constraints on anomalous spin-spin interactions from spin-exchange collisions  

SciTech Connect (OSTI)

A comparison between existing measurements and calculated cross sections for spin exchange between alkali-metal atoms and noble gases (specifically sodium and helium) is used to constrain anomalous spin-dependent forces between nuclei at the atomic scale ({approx}10{sup -8} cm). Combined with existing stringent limits on anomalous short-range, spin-dependent couplings of the proton, the dimensionless coupling constant for an axial vector interaction of the neutron arising from exchange of a boson of mass < or approx. 100 eV is constrained to be g{sub A}{sup n}/{radical}(4{pi}({h_bar}/2{pi})c)<2x10{sup -3}. Constraints are established for a velocity- and spin-dependent interaction {proportional_to}(I{center_dot}v)(K{center_dot}v), where I and K are the nuclear spins of He and Na, respectively, and v is the relative velocity of the atoms. Constraints on torsion gravity are also considered.

Jackson Kimball, D. F.; Boyd, Alec; Budker, D. [Department of Physics, California State University-East Bay, Hayward, California 94542-3084 (United States); Physics and Astronomy Department, Pomona College, Claremont, California 91711-6324 (United States); Department of Physics, University of California at Berkeley, Berkeley, California 94720-7300, and Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)

2010-12-15T23:59:59.000Z

258

Constraints on anomalous spin-spin interactions from spin-exchange collisions  

E-Print Network [OSTI]

Measured and calculated cross sections for spin-exchange between alkali atoms and noble gases (specifically sodium and helium) are used to constrain anomalous spin-dependent forces between nuclei at the atomic scale ($\\sim 10^{-8}~{\\rm cm}$). Combined with existing stringent limits on anomalous short-range, spin-dependent couplings of the proton, the dimensionless coupling constant for a heretofore undiscovered axial vector interaction of the neutron arising from exchange of a boson of mass $\\lesssim 100~{\\rm eV}$ is constrained to be $g_A^n/\\sqrt{4 \\pi \\hbar c} < 2 \\times 10^{-3}$. Constraints are established for a velocity- and spin-dependent interaction $\\propto \\prn{\\mathbf{I} \\cdot \\mathbf{v}} \\prn{\\mathbf{K} \\cdot \\mathbf{v}}$, where $\\mathbf{I}$ and $\\mathbf{K}$ are the nuclear spins of He and Na, respectively, and $\\mathbf{v}$ is the relative velocity of the atoms. Constraints on torsion gravity are also considered.

D. F. Jackson Kimball; Alec Boyd; D. Budker

2010-10-07T23:59:59.000Z

259

Dynamical model of Ising spins  

Science Journals Connector (OSTI)

A two-dimensional dynamical model of Ising spins is introduced. Since we were not able to define energy in our system, we introduced an object called the disagreement function. This function controls the dynamics—minimizing it locally we decide upon spin flipping. Amazingly, local minimization of the disagreement function can lead to an increase of its global value. We present the phase diagram of the system and show that exactly the same initial conditions can lead the system to one of several, completely different final steady states.

Katarzyna Sznajd-Weron

2004-09-30T23:59:59.000Z

260

Chaotic spin correlations in frustrated Ising hierarchical lattices  

E-Print Network [OSTI]

Spin-spin correlations are calculated in frustrated hierarchical Ising models that exhibit chaotic renormalization-group behavior. The spin-spin correlations, as a function of distance, behave chaotically. The far correlations, ...

Aral, Nese

Note: This page contains sample records for the topic "magic angle spinning" 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

Maps for Lorentz transformations of spin  

E-Print Network [OSTI]

Lorentz transformations of spin density matrices for a particle with positive mass and spin 1/2 are described by maps of the kind used in open quantum dynamics. They show how the Lorentz transformations of the spin depend on the momentum. Since the spin and momentum generally are entangled, the maps generally are not completely positive and act in limited domains. States with two momentum values are considered, so the maps are for the spin qubit entangled with the qubit made from the two momentum values, and results from the open quantum dynamics of two coupled qubits can be applied. Inverse maps are used to show that every Lorentz transformation completely removes the spin polarization, and so completely removes the information, from a number of spin density matrices. The size of the spin polarization that is removed is calculated for particular cases.

Thomas F. Jordan; Anil Shaji; E. C. G. Sudarshan

2005-11-08T23:59:59.000Z

262

Spin in the Neutron | Jefferson Lab  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Spin in the Neutron NEWPORT NEWS, Va. - Puzzling out the source of proton and neutron spin is part of the ongoing experimental effort at Jefferson Lab to understand their structure...

263

Accepted Manuscript Using Small Angle Solution Scattering Data in Xplor-NIH Structure Calcula-  

E-Print Network [OSTI]

and wide angle X-ray and small angle neutron scattering for biomolecular structure calculation using and wide angle X-ray scattering (SAXS/WAXS) and small angle neutron scattering (SANS) data, on the otherAccepted Manuscript Using Small Angle Solution Scattering Data in Xplor-NIH Structure Calcula

Clore, G. Marius

264

Single electron spin qubits in electrostatically defined  

E-Print Network [OSTI]

· Read-out: spin-to-charge conversion · Manipulation: exchange interaction, spin-orbit interaction etc-out · Spin to charge conversion x y + Universal 1-qubit gate · Electron spin resonance z x y z Influence;Dilution refrigerator ~ 1m sample @ 25 mK 25 mK 1 K 4 K 300 K #12;Counting electrons onebyone electron

Duisburg-Essen, Universität

265

Inverse spin Hall effect induced by spin pumping into semiconducting ZnO  

SciTech Connect (OSTI)

The inverse spin Hall effect (ISHE) of n-type semiconductor ZnO thin films with weak spin-orbit coupling has been observed by utilizing the spin pumping method. In the ferromagnetic resonance condition, the spin pumping driven by the dynamical exchange interaction of a permalloy film injects a pure spin current into the adjacent ZnO layer. This spin current gives rise to a DC voltage through the ISHE in the ZnO layer, and the DC voltage is proportional to the microwave excitation power. The effect is sizeable even when the spin backflow is considered.

Lee, Jung-Chuan [Institute of Physics, Academia Sinica, Taipei 11529, Taiwan (China); Huang, Leng-Wei [Graduate Institute of Applied Physics, National Chengchi University, Taipei 11605, Taiwan (China); Hung, Dung-Shing, E-mail: dshung@mail.mcu.edu.tw [Institute of Physics, Academia Sinica, Taipei 11529, Taiwan (China); Department of Information and Telecommunications Engineering, Ming Chuan University, Taipei 111, Taiwan (China); Chiang, Tung-Han [Department of Physics, National Cheng Kung University, Tainan 70101, Taiwan (China); Huang, J. C. A., E-mail: jcahuang@mail.ncku.edu.tw [Department of Physics, National Cheng Kung University, Tainan 70101, Taiwan (China); Advanced Optoelectronic Technology Center, National Cheng Kung University, Tainan 70101, Taiwan (China); Liang, Jun-Zhi [Advanced Optoelectronic Technology Center, National Cheng Kung University, Tainan 70101, Taiwan (China); Department of Physics, Fu Jen Catholic University, Taipei 242, Taiwan (China); Lee, Shang-Fan, E-mail: leesf@phys.sinica.edu.tw [Institute of Physics, Academia Sinica, Taipei 11529, Taiwan (China); Graduate Institute of Applied Physics, National Chengchi University, Taipei 11605, Taiwan (China)

2014-02-03T23:59:59.000Z

266

Coherent-state spin qubits in the presence of spin-orbit coupling  

Science Journals Connector (OSTI)

The dynamics of any electron-based qubit in quantum condensed-matter systems will inherently involve both spin and charge degrees of freedom however it is defined. The spin-orbit interaction will cause both spin precession and spin-charge entanglement and the resulting dynamics can be very complex. Here we report a scheme for performing quantum logic operations in quantum condensed-matter systems using coherent-state spin qubits that exploit both the electron's charge and spin degrees of freedom. In addition to the conceptual interest in such qubits, our analytical and numerical techniques have general applicability to many-electron dynamics in spin-orbit systems.

E. T. Owen; M. C. Dean; C. H. W. Barnes

2014-03-06T23:59:59.000Z

267

An antidot array as an edge for total non-reflection of spin waves in yttrium iron garnet films  

SciTech Connect (OSTI)

An array of antidots has been used as an edge to create the phenomenon of total non-reflection of spin waves in yttrium iron garnet films. At the critical angle between the line of antidots and the magnetic field, we observe a high-intensity beam of spin waves moving along the line of antidots. The properties of these waves are investigated experimentally by Brillouin light scattering spectroscopy. The conditions required for the occurrence of this phenomenon based on an analysis of the properties of the isofrequency dependencies are presented. The numerical simulations are in good agreement with those of the experimental measurements.

Gieniusz, R., E-mail: gieniusz@uwb.edu.pl; Guzowska, U.; Maziewski, A. [Faculty of Physics, University of Bia?ystok, Lipowa 41, 15-424 Bia?ystok (Poland); Bessonov, V. D. [Faculty of Physics, University of Bia?ystok, Lipowa 41, 15-424 Bia?ystok (Poland); Institute of Metal Physics, Ural Division of RAS, Yekaterinburg 620041 (Russian Federation); Stognii, A. I. [Scientific-Practical Materials Research Center at National Academy of Sciences of Belarus, ul. P. Brovki 19, Minsk 220072 (Belarus)

2014-02-24T23:59:59.000Z

268

Imaging mesoscopic spin Hall flow: Spatial distribution of local spin currents and spin densities in and out of multiterminal spin-orbit coupled semiconductor nanostructures  

E-Print Network [OSTI]

symmetry and strong crystalline potential.3,4 Furthermore, harnessing of spin currents induced by the spin even in equilibrium when all leads are at the same potential , the total spin currents obtained SO coupling effects are tiny relativistic cor- rections for particles moving through electric fields

Nikolic, Branislav K.

269

Spinning particles in scalar-tensor gravity  

E-Print Network [OSTI]

We develop a new model of a spinning particle in Brans-Dicke spacetime using a metric-compatible connection with torsion. The particle's spin vector is shown to be Fermi-parallel (by the Levi-Civita connection) along its worldline (an autoparallel of the metric-compatible connection) when neglecting spin-curvature coupling.

D. A. Burton; R. W. Tucker; C. H. Wang

2007-11-16T23:59:59.000Z

270

Vivapure Metal Chelate Mega spin columns  

E-Print Network [OSTI]

®® Vivapure Metal Chelate Mega spin columns Hisn Technical data and operating instructions. For in vitro use only. #12;2 Handling overview Vivapure Metal Chelate Mega spin columns - for the purification of proteins with poly-histidine tags Storage conditions Vivapure Metal Chelate Mega spin columns can be stored

Lebendiker, Mario

271

Coadjoint Orbits, Spin and Dequantization  

E-Print Network [OSTI]

In this Letter we propose two path integral approaches to describe the classical mechanics of spinning particles. We show how these formulations can be derived from the associated quantum ones via a sort of geometrical dequantization procedure proposed in a previous paper.

D. Mauro

2004-06-04T23:59:59.000Z

272

Supersymmetry generators of arbitrary spin  

Science Journals Connector (OSTI)

The infinitesimal generators of supersymmetry and translation form a solvable invariant subalgebra of the full graded Lie algebra. In O'Raifeartaigh's classification scheme this belongs to Case (iii). In general we may define the degree-n supersymmetry generators by requiring their nth derived algebra to be equal to translations. In this paper we study degree-1 supersymmetries for which [Si,Sj]=c(??C)ijP?, where a graded commutator is used. Supposing that Si belongs to some representation of the Lorentz group we study the conditions on ?? and C which result from Jacobi identities and Hermitian conjugation. For the three-dimensional case the conditions are satisfied if (?kC)ij is chosen to be a Clebsch-Gordan coefficient. This allows S to have any spin ? 0 and also gives the correct spin-statistics connection (grading). In the four-dimensional case we show how the problem is related to that of finding Lagrangian densities Lk=i?¯????? and Lm=?¯?, which are Hermitian scalars. There are an infinite number of possible representations to which Si can belong, including those of Bhabha type, for which the spin-statistics connection comes naturally from the representation. At the same time there can be supersymmetry generators of several different spins. The Volkov-Akulov nonlinear realization works in all cases and a supersymmetry-invariant Lagrangian can be constructed. Anticommutators seem to be important only in the sense that then we can have finite-dimensional linear realizations.

Jarmo Hietarinta

1976-02-15T23:59:59.000Z

273

BIOTOOLOMICS Ni SuperSpin \\ Cu SuperSpin \\ Co SuperSpin \\ Zn SuperSpin  

E-Print Network [OSTI]

target protein. It is a particularly powerful tool in applications such as small-scale purification, high disposable device that allows rapid purification and screening of histidine- tagged proteins at much less cost. The spin tube is filled with novel metal immobilised chromatography resin of small particles (20

Lebendiker, Mario

274

Phenomena of spin rotation and oscillation of particles (atoms, molecules) containing in a trap blowing on by wind of high energy particles in storage ring  

E-Print Network [OSTI]

Spin rotation and oscillation phenomena of particles captured in a gas target through which beam of high energy particles passes is discussed. Such experiment arrangement make it realizable for storage ring and allows to study zero-angle scattering amplitude at highest possible energies.

Vladimir Baryshevsky

2002-02-14T23:59:59.000Z

275

Large magnetoresistance in oxide based ferromagnet/superconductor spin switches.  

SciTech Connect (OSTI)

We report large magnetoresistance (in excess of 1000%) in ferromagnet / superconductor / ferromagnet structures made of La{sub 0.7}Ca{sub 0.3}MnO{sub 3} and YBa{sub 2}Cu{sub 3}O{sub 7} in the current in plane (CIP) geometry. This magnetoresistance has many of the ingredients of the giant magnetoresistance of metallic superlattices: it is independent on the angle between current and magnetic field, depends on the relative orientation of the magnetization in the ferromagnetic layers, and takes very large values. The origin is enhanced scattering at the F/S interface in the anti parallel configuration of the magnetizations. Furthermore, we examine the dependence of the magnetoresistance effect on the thickness of the superconducting layer, and show that the magnetoresistance dies out for thickness in excess of 30 nm, setting a length scale for the diffusion of spin polarized quasiparticles.

Pena, V.; Nemes, N.; Visani, C.; Garcia-Barriocanal, J.; Bruno, F.; Arias, D.; Sefrioui, Z.; Leon, C.; te Velthuis, S. G. E.; Hoffmann, A.; Garcia-Hernandez, M.; Santamaria, J.; Materials Science Division; Univ. Complutense de Madrid; Inst. de Ciencia de Materiales de Madrid

2006-01-01T23:59:59.000Z

276

F spin as a partial symmetry  

Science Journals Connector (OSTI)

We use the empirical evidence that F-spin multiplets exist in nuclei for only selected states as an indication that F spin can be regarded as a partial symmetry. We show that there is a class of non-F-scalar IBM-2 Hamiltonians with partial F-spin symmetry, which reproduce the known systematics of collective bands in nuclei. These Hamiltonians predict that the scissors states have good F-spin and form F-spin multiplets, which is supported by the existing data.

A. Leviatan and J. N. Ginocchio

2000-01-12T23:59:59.000Z

277

Visualizing operators of coupled spin systems  

E-Print Network [OSTI]

The state of quantum systems, their energetics, and their time evolution is modeled by abstract operators. How can one visualize such operators for coupled spin systems? A general approach is presented which consists of several shapes representing linear combinations of spherical harmonics. It is applicable to an arbitrary number of spins and can be interpreted as a generalization of Wigner functions. The corresponding visualization transforms naturally under non-selective spin rotations as well as spin permutations. Examples and applications are illustrated for the case of three spins 1/2.

Ariane Garon; Robert Zeier; Steffen J. Glaser

2014-09-18T23:59:59.000Z

278

Higher Spin String States Scattered from D-Particle in the Regge Regime and Factorized Ratios of Fixed Angle Scatterings  

Science Journals Connector (OSTI)

......D are not affected by the replacement of eP with eL if we take the limit b0 after taking the Regge limit. Therefore we pro- ceed as in the previous works on Regge scattering. The calculation for the complete ratios of leading (in b0) RR closed string......

Jen-Chi Lee; Yoshihiro Mitsuka; Yi Yang

2011-09-01T23:59:59.000Z

279

Atmospheric Radiation Measurement (ARM) Data from Los Angeles, California, to Honolulu, Hawaii for the Marine ARM GPCI Investigation of Clouds (MAGIC) Field Campaign (an AMF2 Deployment)  

DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

From October 2012 through September 2013, the second ARM Mobile Facility (AMF2) was deployed on the container ship Spirit, operated by Horizon Lines, for the Marine ARM GPCI* Investigation of Clouds (MAGIC) field campaign. During approximately 20 round trips between Los Angeles, California, and Honolulu, Hawaii, AMF2 obtained continuous on-board measurements of cloud and precipitation, aerosols, and atmospheric radiation; surface meteorological and oceanographic variables; and atmospheric profiles from weather balloons launched every six hours. During two two-week intensive observational periods in January and July 2013, additional instruments were deployed and balloon soundings were be increased to every three hours. These additional data provided a more detailed characterization of the state of the atmosphere and its daily cycle during two distinctly different seasons. The primary objective of MAGIC was to improve the representation of the stratocumulus-to-cumulus transition in climate models. AMF2 data documented the small-scale physical processes associated with turbulence, convection, and radiation in a variety of marine cloud types.

280

General Compression Looks at Energy Storage from a Different Angle |  

Broader source: Energy.gov (indexed) [DOE]

General Compression Looks at Energy Storage from a Different Angle General Compression Looks at Energy Storage from a Different Angle General Compression Looks at Energy Storage from a Different Angle February 3, 2011 - 3:36pm Addthis Image of the General Compression CAES system | courtesy of General Compression, Inc. Image of the General Compression CAES system | courtesy of General Compression, Inc. April Saylor April Saylor Former Digital Outreach Strategist, Office of Public Affairs Earlier this week, we told you about a new company that's developing battery technology that will allow energy storage for multiple hours on the power grid. General Compression is another innovative company that's developing a different way to store electricity by using compressed air energy storage, or CAES. The technology uses cheap power to pump air into

Note: This page contains sample records for the topic "magic angle spinning" 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

Correlation of conductivity and angle integrated valence band photoemission  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Correlation of conductivity and angle integrated valence band photoemission Correlation of conductivity and angle integrated valence band photoemission characteristics in single crystal iron perovskites for 300 K < T < 800 K: Comparison of surface and bulk sensitive methods Title Correlation of conductivity and angle integrated valence band photoemission characteristics in single crystal iron perovskites for 300 K < T < 800 K: Comparison of surface and bulk sensitive methods Publication Type Journal Article Year of Publication 2010 Authors Braun, Artur, Bongjin S. Mun, Yun Sun, Z. Liu, Oliver Gröning, R. Mäder, Selma Erat, Xueyuan Zhang, Samuel S. Mao, Ekaterina Pomjakushina, Kazimierz Conder, and Thomas Graule Journal Journal of Electron Spectroscopy and Related Phenomena Volume 181 Issue 1 Pagination 56-62 Date Published 07/2013

282

General Compression Looks at Energy Storage from a Different Angle |  

Broader source: Energy.gov (indexed) [DOE]

General Compression Looks at Energy Storage from a Different Angle General Compression Looks at Energy Storage from a Different Angle General Compression Looks at Energy Storage from a Different Angle February 3, 2011 - 3:36pm Addthis Image of the General Compression CAES system | courtesy of General Compression, Inc. Image of the General Compression CAES system | courtesy of General Compression, Inc. April Saylor April Saylor Former Digital Outreach Strategist, Office of Public Affairs Earlier this week, we told you about a new company that's developing battery technology that will allow energy storage for multiple hours on the power grid. General Compression is another innovative company that's developing a different way to store electricity by using compressed air energy storage, or CAES. The technology uses cheap power to pump air into

283

Ising Chain with a Spin Impurity  

Science Journals Connector (OSTI)

Consider a closed, linear chain of N localized spins (each s=12) with nearest-neighbor Ising interaction. Such a chain, exposed to a uniform external magnetic field, will be called the pure host. Replace a single spin in the pure host by an impurity spin which is also subjected to nearest-neighbor Ising interaction and to the external field. The magnitude of the impurity spin, the magnitude of its magnetic moment, and the magnitude and sign of its interaction with the host are allowed to differ from the corresponding values characterizing the host. For the bulk system (N??, for constant linear density of spins), the thermodynamic properties, such as the impurity magnetization, the (position-dependent) magnetization of the impurity-host system and the impurity-host spin correlation functions, are obtained exactly in terms of conventional, tabulated functions. Numerical results are presented for impurity spins of magnitude S=32,52.

H. Falk

1966-11-04T23:59:59.000Z

284

E-Print Network 3.0 - anomalous small-angle x-ray Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

2008Standard Operating Procedure Title: Small Angle X-ray Scattering... approved: December 26 2009 Small Angle X-ray Scattering, Rotating Anode PURPOSE: This Standard...

285

E-Print Network 3.0 - angle x-ray scattering Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

2008Standard Operating Procedure Title: Small Angle X-ray Scattering... approved: December 26 2009 Small Angle X-ray Scattering, Rotating Anode PURPOSE: This Standard...

286

E-Print Network 3.0 - angle scattering studies Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Search Sample search results for: angle scattering studies Page: << < 1 2 3 4 5 > >> 1 Neutron Scattering in Polymer Micelle Characterization Summary: scattering Small Angle...

287

E-Print Network 3.0 - alpha angle measurement Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

9 Calibration of the University of North Dakota's Citation Summary: Measurement Unit 12;12;Calibration Procedure Heading Angle Offset Alpha Angle Calibration Beta...

288

E-Print Network 3.0 - angle-resolved ultraviolet photoelectron...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Ph.D. March, 1994. Thesis: "Angle-Resolved Photoemission Study of Several Transition Metal... .D. 2003. Thesis: "Angle-Resolved Photoemission Study of the Elelctronic Structure...

289

On the Euler angles for SU(N)  

SciTech Connect (OSTI)

In this paper we reconsider the problem of the Euler parametrization for the unitary groups. After constructing the generic group element in terms of generalized angles, we compute the invariant measure on SU(N) and then we determine the full range of the parameters, using both topological and geometrical methods. In particular, we show that the given parametrization realizes the group SU(N+1) as a fibration of U(N) over the complex projective space CP{sup n}. This justifies the interpretation of the parameters as generalized Euler angles.

Cerchiai, Bianca L; Bertini, S.; Cacciatori, Sergio L.

2005-10-20T23:59:59.000Z

290

Demonstration of Angle Dependent Casimir Force Between Corrugations  

E-Print Network [OSTI]

The normal Casimir force between a sinusoidally corrugated gold coated plate and a sphere was measured at various angles between the corrugations using an atomic force microscope. A strong dependence on the orientation angle of the corrugation is found. The measured forces were found to deviate from the proximity force approximation and are in agreement with the theory based on the gradient expansion including correlation effects of geometry and material properties. We analyze the role of temperature. The obtained results open new opportunities for control of the Casimir effect in micromechanical systems.

A. A. Banishev; J. Wagner; T. Emig; R. Zandi; U. Mohideen

2012-12-26T23:59:59.000Z

291

The Extreme Spin of the Black Hole in Cygnus X-1  

Science Journals Connector (OSTI)

The compact primary in the X-ray binary Cygnus X-1 was the first black hole to be established via dynamical observations. We have recently determined accurate values for its mass and distance, and for the orbital inclination angle of the binary. Building on these results, which are based on our favored (asynchronous) dynamical model, we have measured the radius of the inner edge of the black hole's accretion disk by fitting its thermal continuum spectrum to a fully relativistic model of a thin accretion disk. Assuming that the spin axis of the black hole is aligned with the orbital angular momentum vector, we have determined that Cygnus X-1 contains a near-extreme Kerr black hole with a spin parameter a * > 0.95 (3?). For a less probable (synchronous) dynamical model, we find a * > 0.92 (3?). In our analysis, we include the uncertainties in black hole mass, orbital inclination angle, and distance, and we also include the uncertainty in the calibration of the absolute flux via the Crab. These four sources of uncertainty totally dominate the error budget. The uncertainties introduced by the thin-disk model we employ are particularly small in this case given the extreme spin of the black hole and the disk's low luminosity.

Lijun Gou; Jeffrey E. McClintock; Mark J. Reid; Jerome A. Orosz; James F. Steiner; Ramesh Narayan; Jingen Xiang; Ronald A. Remillard; Keith A. Arnaud; Shane W. Davis

2011-01-01T23:59:59.000Z

292

State Transfer and Spin Measurement  

E-Print Network [OSTI]

We present a Hamiltonian that can be used for amplifying the signal from a quantum state, enabling the measurement of a macroscopic observable to determine the state of a single spin. We prove a general mapping between this Hamiltonian and an exchange Hamiltonian for arbitrary coupling strengths and local magnetic fields. This facilitates the use of existing schemes for perfect state transfer to give perfect amplification. We further prove a link between the evolution of this fixed Hamiltonian and classical Cellular Automata, thereby unifying previous approaches to this amplification task. Finally, we show how to use the new Hamiltonian for perfect state transfer in the, to date, unique scenario where total spin is not conserved during the evolution, and demonstrate that this yields a significantly different response in the presence of decoherence.

A. Kay

2006-04-21T23:59:59.000Z

293

Spin Waves and Neutron Scattering  

Science Journals Connector (OSTI)

A review is given of the problems in this field and of the possibilities opened up by the fact that neutron scattering gives access to the time?dependent spin?correlation function in magnets over virtually the whole range of q t and T. New experimental results are given in connection with magnon energy linewidth and renormalization and some data are presented for the spin?wave stiffness of bcc 3d transition?metal alloys as a function of electron concentration showing effects explained by the electronic density?of?states curve. It is pointed out that the ground?state fluctuations of magnets give rise to effects in the formulas for neutron scattering.

R. D. Lowde

1965-01-01T23:59:59.000Z

294

Redundant operators for Ising spins  

Science Journals Connector (OSTI)

We remind the reader of the important role that could be played in Monte Carlo renormalization-group studies by redundant operators, defined to be changes in the Hamiltonian due to infinitesimal changes of variables. We then overcome the problem of defining an infinitesimal change of variables for discrete Ising spins and construct redundant operators in d=2 and 3. We analyze how they may be seen in numerical experiments.

Ganpathy Murthy and R. Shankar

1985-11-01T23:59:59.000Z

295

Spherical Pendulum, Actions, and Spin  

Science Journals Connector (OSTI)

To fill this gap, our research group has worked out energy surfaces in action variable representation, for a number of classical problems:? the Euler, Lagrange, and Kovalevskaya cases of rigid body dynamics,8-10 billiards in ellipsoids,11,12 and particle motion around point masses with Schwarzschild or Kerr metric as well as around two fixed centers. ... These tori are mirror images of each other under the spin transformation P. ...

Peter H. Richter; Holger R. Dullin; Holger Waalkens; Jan Wiersig

1996-12-05T23:59:59.000Z

296

Demand Response Spinning Reserve Demonstration  

SciTech Connect (OSTI)

The Demand Response Spinning Reserve project is a pioneeringdemonstration of how existing utility load-management assets can providean important electricity system reliability resource known as spinningreserve. Using aggregated demand-side resources to provide spinningreserve will give grid operators at the California Independent SystemOperator (CAISO) and Southern California Edison (SCE) a powerful, newtool to improve system reliability, prevent rolling blackouts, and lowersystem operating costs.

Eto, Joseph H.; Nelson-Hoffman, Janine; Torres, Carlos; Hirth,Scott; Yinger, Bob; Kueck, John; Kirby, Brendan; Bernier, Clark; Wright,Roger; Barat, A.; Watson, David S.

2007-05-01T23:59:59.000Z

297

Spin-Electricity Conversion Induced by Spin Injection into Topological Insulators  

Science Journals Connector (OSTI)

We report successful spin injection into the surface states of topological insulators by using a spin pumping technique. By measuring the voltage that shows up across the samples as a result of spin pumping, we demonstrate that a spin-electricity conversion effect takes place in the surface states of bulk-insulating topological insulators Bi1.5Sb0.5Te1.7Se1.3 and Sn-doped Bi2Te2Se. In this process, the injected spins are converted into a charge current along the Hall direction due to the spin-momentum locking on the surface state.

Y. Shiomi; K. Nomura; Y. Kajiwara; K. Eto; M. Novak; Kouji Segawa; Yoichi Ando; E. Saitoh

2014-11-03T23:59:59.000Z

298

Dynamic spin fluctuations at T?0 in a spin-12 ferromagnetic kagome lattice  

Science Journals Connector (OSTI)

We report magnetization, electron-spin resonance (ESR), and muon-spin relaxation (?SR) measurements on single crystals of the S=1/2 (Cu+2) kagome compound Cu(1,3-benzendicarboxylate). The ?SR is carried to temperatures as low as 45 mK. The spin-Hamiltonian parameters are determined from the analysis of the magnetization and ESR data. We find that this compound has anisotropic ferromagnetic interactions. Nevertheless, no spin freezing is observed even at temperatures two orders of magnitude lower than the coupling constants. In light of this finding, the relation between persistent spin dynamics and spin liquids on kagome lattices is reexamined.

Oren Ofer; Lital Marcipar; V. Ravi Chandra; Snir Gazit; Daniel Podolsky; Daniel P. Arovas; Amit Keren

2014-05-16T23:59:59.000Z

299

Wide-angle point-to-point x-ray imaging with almost arbitrarily large angles of incidence  

SciTech Connect (OSTI)

The paper describes a new scheme for wide-angle point-to-point x-ray imaging with almost arbitrarily large angles of incidence by a matched pair of spherically bent crystals to eliminate the astigmatism, which is a well-known imaging error of spherical mirrors. In addition to x rays, the scheme should be applicable to a very broad spectrum of the electromagnetic radiation, including microwaves, infrared and visible light, as well as UV and extreme UV radiation, if the crystals are replaced with appropriate spherical reflectors. The scheme may also be applicable to the imaging with ultrasound.

Bitter, M.; Hill, K. W.; Scott, S.; Feder, R. [Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543 (United States); Ko, Jinseok; Ince-Cushman, A.; Rice, J. E. [Plasma Science and Fusion Center, Cambridge, Massachusetts 02139 (United States)

2008-10-15T23:59:59.000Z

300

Foams As Viewed by Small-Angle Neutron Scattering  

Science Journals Connector (OSTI)

Foams As Viewed by Small-Angle Neutron Scattering ... For wet foams, we met other difficulties, common to any strongly scattering system:? a part of the scattered beam is collected in the central cells along with the transmitted beam; this can spoil the transmission measurements. ...

Monique A. V. Axelos; François Boué

2003-07-04T23:59:59.000Z

Note: This page contains sample records for the topic "magic angle spinning" 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

SANS -Small Angle Neutron Scattering Tcnica de difrao  

E-Print Network [OSTI]

SANS - Small Angle Neutron Scattering Técnica de difração informações sobre tamanho e forma de- Neutrons are created in the centre of the target station when the beam of high energy protons collides by evaporating nuclear particles, mainly neutrons, in all directions. Each proton produces approximately 15

Loh, Watson

302

Improvement of data treatment in small-angle neutron scattering  

Science Journals Connector (OSTI)

General equations are given for background subtraction of SANS treatment, which account for large scattering angles () and allow the extraction of the scattering due to the sample when the later is inside a container that displays a spurious scattering signal. Several calibration methods to determine the inherent sample backgrounds are also described.

Br?let, A.

2007-01-12T23:59:59.000Z

303

3D discrete rotations using hinge angles Yohan Thibaulta,  

E-Print Network [OSTI]

3D discrete rotations using hinge angles Yohan Thibaulta, , Akihiro Sugimotob , Yukiko Kenmochia a of Informatics, Japan Abstract In this paper, we study 3D rotations on grid points computed by using only integers. For that purpose, we investigate the intersection between the 3D half- grid and the rotation

Paris-Sud XI, Université de

304

(c) Sample orientation angle: 0 deg PMMA sheet Rotation  

E-Print Network [OSTI]

Mirror Moving stage PMMA Sheet Backlight Frontside ignition High speed video camera Laser beam Backside and ignition was obtained using a CO2 laser. The phenomena of non- piloted ignition over the irradiated PMMAPMMA sheet Rotation CO2 laser (c) Sample orientation angle: 0 deg Mirror PMMA sheet Rotation CO2

Kihm, IconKenneth David

305

Wind Turbine Pitch Angle Controllers for Grid Frequency Stabilisation  

E-Print Network [OSTI]

Laboratory Wind Energy Department P.O. Box 49 DK-4000 Roskilde, Denmark clemens.jauch@risoe.dk Abstract in Norway [4]. For the purpose of this research work the power system model has been extended with a windWind Turbine Pitch Angle Controllers for Grid Frequency Stabilisation Clemens Jauch Risø National

306

Large spin accumulation near a resistive interface due to spin-charge coupling  

SciTech Connect (OSTI)

We experimentally and theoretically investigate large spin signals in special nonlocal spin valves, where a vacuum break-junction is formed between the ferromagnetic spin detector and the nonmagnetic channel. The spin signals are clearly nonlocal and can be either non-inverted (meaning high nonlocal resistance for parallel states and low resistance for antiparallel states) or inverted. The magnitudes are significantly larger than those of standard metallic nonlocal devices with similar dimensions. The magnitudes and the signs can be understood by a theory of spin-charge coupling. The coupling between spin accumulation and charge accumulation across a resistive break junction leads to a large interfacial spin accumulation and thereby large spin signals. By analyzing the profiles of electrochemical potentials near the interface, we show that the sign of the spin signal depends on the values of spin-dependent conductivities, diffusion constants, and densities of states. The magnitude of the spin accumulation in the ferromagnetic spin detector can be higher than that in the nonmagnetic channel, enabling a rare amplification effect for spin accumulation.

Chen, Shuhan; Zou, Han; Chui, Siu-Tat; Ji, Yi, E-mail: yji@physics.udel.edu [Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716 (United States)

2013-12-14T23:59:59.000Z

307

Small-Angle Neutron Scattering Studies of Charged Carboxyl-Terminated Dendrimers in Solutions  

E-Print Network [OSTI]

Small-Angle Neutron Scattering Studies of Charged Carboxyl-Terminated Dendrimers in Solutions Q. R-angle neutron scattering was used to characterize the solution behavior of charged carboxylic acid terminated- copy,16 small-angle X-ray scattering,17 and small-angle neutron scattering (SANS),18-25 have been used

Dubin, Paul D.

308

Bubble Contact Angle Method for Evaluating Substratum Interfacial Characteristics and Its Relevance to Bacterial Attachment  

Science Journals Connector (OSTI)

...research-article General Microbial Ecology Bubble Contact Angle Method for Evaluating Substratum...New South Wales 2033, Australia. A bubble contact angle method was used to determine...hydrophilic, giving an angle of 29 or less. Bubble contact angles at the surfaces exposed...

Madilyn Fletcher; K. C. Marshall

1982-07-01T23:59:59.000Z

309

Definition: Spinning Reserve | Open Energy Information  

Open Energy Info (EERE)

Spinning Reserve Spinning Reserve Jump to: navigation, search Dictionary.png Spinning Reserve Unloaded generation that is synchronized and ready to serve additional demand.[1] View on Wikipedia Wikipedia Definition In electricity networks, the operating reserve is the generating capacity available to the system operator within a short interval of time to meet demand in case a generator goes down or there is another disruption to the supply. Most power systems are designed so that, under normal conditions, the operating reserve is always at least the capacity of the largest generator plus a fraction of the peak load. The operating reserve is made up of the spinning reserve as well as the non-spinning or supplemental reserve: The spinning reserve is the extra generating capacity

310

Ambipolar spin diffusion and D'yakonov-Perel' spin relaxation in GaAs quantum wells  

E-Print Network [OSTI]

We report theoretical and experimental studies of ambipolar spin diffusion in a semiconductor. A circularly polarized laser pulse is used to excite spin-polarized carriers in a GaAs multiple quantum-well sample at 80 K. ...

Zhao, Hui; Mower, Matt; Vignale, G.

2009-03-01T23:59:59.000Z

311

Spin injection and transport in semiconductor and metal nanostructures  

E-Print Network [OSTI]

coefficient and can be determined for our devices from two-terminal spin valvecoefficient of the spin-selective contacts, ? n and ? sf are total ‘transport time’ through the spin valve andcoefficient of the spin-selective contacts, ? n and ? sf are total ‘transport time’ through the spin valve and

Zhu, Lei

2009-01-01T23:59:59.000Z

312

Dynamics of the Structural Glass Transition and the p-Spin—Interaction Spin-Glass Model  

Science Journals Connector (OSTI)

The mathematical structure of the dynamical theory for the soft-spin version of the p-spin-interaction (p>2) spin-glass model is related to that for the dynamical theories of the structural glass transition. The phase transitions predicted by both theories are discussed. The spin-glass transition predicted by the dynamical theory is related to a broken-replica-symmetry equilibrium calculation.

T. R. Kirkpatrick and D. Thirumalai

1987-05-18T23:59:59.000Z

313

Interface states of quantum spin systems  

E-Print Network [OSTI]

We review recent results as well as ongoing work and open problems concerning interface states in quantum spin systems at zero and finite temperature.

Alain Messager; Bruno Nachtergaele

1998-09-30T23:59:59.000Z

314

High-precision B(E2) measurements of semi-magic 58,60,62,64Ni by Coulomb excitation  

SciTech Connect (OSTI)

High-precision reduced electric-quadrupole transition probabilities B(E2) have been measured from single-step Coulomb excitation of semi-magic 58,60,62,64 Ni (Z = 28) beams at 1.8 MeV per nucleon on a natural carbon target. The energy loss of the nickel beams through the carbon target were directly measured with a zero-degree Bragg detector and the absolute B(E2) values were normalized by Rutherford scattering. The B(E2) values disagree with recent lifetime studies that employed the Doppler-shift attenuation method. The present high-precision B(E2) values reveal an asymmetry about 62 Ni, midshell between N = 28 and 40, with larger values towards 56 Ni (Z = N = 28). The experimental B(E2) values are compared with shell-model calculations in the full pf model space and the results indicate a soft 56 Ni core.

Allmond, James M [ORNL; Brown, Alex [National Superconducting Cyclotron Laboratory (NSCL), Michigan State University; Stuchbery, Andrew E [ORNL; Galindo-Uribarri, Alfredo {nmn} [ORNL; Padilla-Rodal, Elizabeth [Universidad Nacional Autonoma de Mexico (UNAM); Radford, David C [ORNL; Batchelder, J. C. [Oak Ridge Associated Universities (ORAU); Howard, Meredith E [ORNL; Liang, J Felix [ORNL; Manning, Brett M [ORNL; Varner Jr, Robert L [ORNL; Yu, Chang-Hong [ORNL

2014-01-01T23:59:59.000Z

315

Experimental Verification of Comparability between Spin-Orbit and Spin-Diffusion Lengths Yasuhiro Niimi,1,* Dahai Wei,1  

E-Print Network [OSTI]

measurements are comparable to the spin diffusion lengths determined from lateral spin valve ones. Even spin-orbit length nicely follows a linear law as a function of the diffusion coefficient, clearly valve devices or along edges of samples with spin Hall effects (SHEs). Such a large spin accumulation

Otani, Yoshichika

316

Pitch-angle scattering of energetic particles with adiabatic focusing  

E-Print Network [OSTI]

Understanding turbulent transport of charged particles in magnetized plasmas often requires a model for the description of random variations in the particle's pitch angle. The Fokker-Planck coefficient of pitch-angle scattering, which is used to describe scattering parallel to the mean magnetic field, is therefore of central importance. Whereas quasi-linear theory assumes a homogeneous mean magnetic field, such a condition is often not fulfilled, especially for high-energy particles. Here, a new derivation of the quasi-linear approach is given that is based on the unperturbed orbit found for an adiabatically focused mean magnetic field. The results show that, depending on the ratio of the focusing length and the particle's Larmor radius, the Fokker-Planck coefficient is significantly modified but agrees with the classical expression in the limit of a homogeneous mean magnetic field.

Tautz, R C; Dosch, A

2014-01-01T23:59:59.000Z

317

NA Standards | Valence Geometries | Bond Angles-Furanose Rings  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

angles in Furanose Rings angles in Furanose Rings ----------------------------------------------------- ribose deoxyribose ----------------------------------------------------- angle mean esd N mean esd N value value ----------------------------------------------------- C1'-C2'-C3' 101.5 (0.9, 80) 102.7 (1.4, 47) C2'-C3'-C4' 102.7 (1.0, 80) 103.2 (1.0, 47) C3'-C4'-O4' 105.5 (1.4, 80) 105.6 (1.0, 47) C4'-O4'-C1' 109.6 (0.9, 80) 109.7 (1.4, 47) O4'-C1'-C2' 106.4 (1.4, 80) 106.1 (1.0, 47) C1'-C2'-O2' 110.6 (3.0, 80) na C3'-C2'-O2' 113.3 (2.9, 80) na C2'-C3'-O3' 111.0 (2.8, 80) 110.6 (2.7, 47) C4'-C3'-O3' 110.6 (2.6, 80) 110.3 (2.2, 47) C5'-C4'-C3' 115.5 (1.5, 80) 114.7 (1.5, 47)

318

Criticality without Frustration for Quantum Spin-1 Chains  

E-Print Network [OSTI]

Frustration-free (FF) spin chains have a property that their ground state minimizes all individual terms in the chain Hamiltonian. We ask how entangled the ground state of a FF quantum spin-s chain with nearest-neighbor ...

Movassagh, Ramis

319

Spin coherence transfer in chemical transformations monitored NMR  

E-Print Network [OSTI]

the transfer of spin coherence in non-equilibrium chemicalK. L. Pierce, A. Pines ? Spin coherence transfer in chemical10.1002/anie.200123456 Spin Coherence Transfer in Chemical

Anwar, Sabieh M.; Hilty, Christian; Chu, Chester; Bouchard, Louis-S.; Pierce, Kimberly L.; Pines, Alexander

2006-01-01T23:59:59.000Z

320

Spin Transport and Relaxation in Graphene and Germanium  

E-Print Network [OSTI]

the diffusion coefficients of the SLG spin valve (device A)diffusion coefficients are observed in SLG spin valve withvalves (device D). (a) Spin lifetime (squares) and diffusion coefficient (

Han, Wei

2011-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "magic angle spinning" 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

Hysteretic Optimization For Spin Glasses  

E-Print Network [OSTI]

The recently proposed Hysteretic Optimization (HO) procedure is applied to the 1D Ising spin chain with long range interactions. To study its effectiveness, the quality of ground state energies found as a function of the distance dependence exponent, $\\sigma$, is assessed. It is found that the transition from an infinite-range to a long-range interaction at $\\sigma=0.5$ is accompanied by a sharp decrease in the performance . The transition is signaled by a change in the scaling behavior of the average avalanche size observed during the hysteresis process. This indicates that HO requires the system to be infinite-range, with a high degree of interconnectivity between variables leading to large avalanches, in order to function properly. An analysis of the way auto-correlations evolve during the optimization procedure confirm that the search of phase space is less efficient, with the system becoming effectively stuck in suboptimal configurations much earlier. These observations explain the poor performance that HO obtained for the Edwards-Anderson spin glass on finite-dimensional lattices, and suggest that its usefulness might be limited in many combinatorial optimization problems.

B. Goncalves; S. Boettcher

2007-12-10T23:59:59.000Z

322

Single-parameter spin-pumping in driven metallic rings with spin-orbit coupling  

SciTech Connect (OSTI)

We consider the generation of a pure spin-current at zero bias voltage with a single time-dependent potential. To such end we study a device made of a mesoscopic ring connected to electrodes and clarify the interplay between a magnetic flux, spin-orbit coupling, and non-adiabatic driving in the production of a spin and electrical current. By using Floquet theory, we show that the generated spin to charge current ratio can be controlled by tuning the spin-orbit coupling.

Ramos, J. P.; Apel, V. M. [Departamento de Física, Universidad Católica del Norte, Angamos 0610, Casilla 1280, Antofagasta (Chile); Foa Torres, L. E. F. [Instituto de Física Enrique Gaviola (CONICET) and FaMAF, Universidad Nacional de Córdoba, Ciudad Universitaria 5000, Córdoba (Argentina); Orellana, P. A. [Departamento de Física, Universidad Técnica Federico Santa María, Avenida Vicuña Mackenna 3939, San Joaquin, Santiago (Chile)

2014-03-28T23:59:59.000Z

323

Pseudo-spin paramagnetism in graphene  

SciTech Connect (OSTI)

We calculate the orbital diamagnetic susceptibility of monolayer graphene with an energy gap. The valley pseudo-spin produces paramagnetic susceptibility analogous to contribution from real spin, and explains the origin of a singular orbital magnetism at Dirac point of monolayer graphene.

Koshino, Mikito; Ando, Tsuneya [Department of Physics, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152-8551 (Japan)

2011-12-23T23:59:59.000Z

324

Spacetime Warps for Spinning Particles Possible?  

E-Print Network [OSTI]

By incorporating spinning particles into the framework of classical General Relativity, the theory is changed insofar, as, though using holonome coordinates, the connexion becomes asymmetrical. This implies, that partial derivatives do not commute any longer. Hence, the class of functions under consideration has to be extended. A non-minimal extension leads to the possibility of spacetime warps for spinning particles.

T. Dudas

2002-01-04T23:59:59.000Z

325

Environment Assisted Metrology with Spin Qubit  

E-Print Network [OSTI]

We investigate the sensitivity of a recently proposed method for precision measurement [Phys. Rev. Lett. 106, 140502 (2011)], focusing on an implementation based on solid-state spin systems. The scheme amplifies a quantum sensor response to weak external fields by exploiting its coupling to spin impurities in the environment. We analyze the limits to the sensitivity due to decoherence and propose dynamical decoupling schemes to increase the spin coherence time. The sensitivity is also limited by the environment spin polarization; therefore we discuss strategies to polarize the environment spins and present a method to extend the scheme to the case of zero polarization. The coherence time and polarization determine a figure of merit for the environment's ability to enhance the sensitivity compared to echo-based sensing schemes. This figure of merit can be used to engineer optimized samples for high-sensitivity nanoscale magnetic sensing, such as diamond nanocrystals with controlled impurity density.

Cappellaro, P; Hodges, J S; Jiang, L; Maze, J R; Sørensen, A S; Lukin, M D

2012-01-01T23:59:59.000Z

326

Neutron Spin Resonance in Iron-based Superconductors | The Ames...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Neutron Spin Resonance in Iron-based Superconductors The propagation of a novel magnetic excitation in the superconducting state, called a spin resonance, has been observed in iron...

327

Quantum Decoherence of the Central Spin in a Sparse System of Dipolar Coupled Spins  

E-Print Network [OSTI]

The central spin decoherence problem has been researched for over 50 years in the context of both nuclear magnetic resonance and electron spin resonance. Until recently, theoretical models have employed phenomenological stochastic descriptions of the bath-induced noise. During the last few years, cluster expansion methods have provided a microscopic, quantum theory to study the spectral diffusion of a central spin. These methods have proven to be very accurate and efficient for problems of nuclear-induced electron spin decoherence in which hyperfine interactions with the central electron spin are much stronger than dipolar interactions among the nuclei. We provide an in-depth study of central spin decoherence for a canonical scale-invariant all-dipolar spin system. We show how cluster methods may be adapted to treat this problem in which central and bath spin interactions are of comparable strength. Our extensive numerical work shows that a properly modified cluster theory is convergent for this problem even as simple perturbative arguments begin to break down. By treating clusters in the presence of energy detunings due to the long-range (diagonal) dipolar interactions of the surrounding environment and carefully averaging the effects over different spin states, we find that the nontrivial flip-flop dynamics among the spins becomes effectively localized by disorder in the energy splittings of the spins. This localization effect allows for a robust calculation of the spin echo signal in a dipolarly coupled bath of spins of the same kind, while considering clusters of no more than 6 spins. We connect these microscopic calculation results to the existing stochastic models. We, furthermore, present calculations for a series of related problems of interest for candidate solid state quantum bits including donors and quantum dots in silicon as well as nitrogen-vacancy centers in diamond.

Wayne M. Witzel; Malcolm S. Carroll; Lukasz Cywinski; S. Das Sarma

2012-08-02T23:59:59.000Z

328

Evanescent-wave coupled right angled buried waveguide: Applications in carbon nanotube mode-locking  

SciTech Connect (OSTI)

We present an evanescent-field device based on a right-angled waveguide. This consists of orthogonal waveguides, with their points of intersection lying along an angled facet of the chip. Light guided along one waveguide is incident at the angled dielectric-air facet at an angle exceeding the critical angle, so that the totally internally reflected light is coupled into the second waveguide. By depositing a nanotube film on the angled surface, the chip is then used to mode-lock an Erbium doped fiber ring laser with a repetition rate of 26?MHz, and pulse duration of 800?fs.

Mary, R.; Thomson, R. R.; Kar, A. K., E-mail: a.k.kar@hw.ac.uk [Institute of Photonics and Quantum Sciences, Heriot-Watt University, Edinburgh EH14 4AS (United Kingdom); Brown, G. [Optoscribe Ltd, 0/14 Alba Innovation Centre, Alba Campus, Livingston EH54 7GA (United Kingdom)] [Optoscribe Ltd, 0/14 Alba Innovation Centre, Alba Campus, Livingston EH54 7GA (United Kingdom); Beecher, S. J. [Optoelectronics Research Centre, University of Southampton, Southampton SO17 1BJ (United Kingdom)] [Optoelectronics Research Centre, University of Southampton, Southampton SO17 1BJ (United Kingdom); Popa, D.; Sun, Z.; Torrisi, F.; Hasan, T.; Milana, S.; Bonaccorso, F.; Ferrari, A. C. [Cambridge Graphene Centre, University of Cambridge, Cambridge CB3 0FA (United Kingdom)] [Cambridge Graphene Centre, University of Cambridge, Cambridge CB3 0FA (United Kingdom)

2013-11-25T23:59:59.000Z

329

Generalized spin systems and ? models  

Science Journals Connector (OSTI)

A generalization of the SU(2) spin systems on a lattice and their continuum limit to an arbitrary compact group G is discussed. The continuum limits are, in general, nonrelativistic ?-model-type field theories targeted on a homogeneous space G/H, where H contains the maximal torus of G. In the ferromagnetic case the equations of motion derived from our continuum Lagrangian generalize the Landau-Lifshitz equations with quadratic dispersion relation for small wave vectors. In the antiferromagnetic case the dispersion law is always linear in the long-wavelength limit. The models become relativistic only when G/H is a symmetric space. Also discussed are a generalization of the Holstein-Primakoff representation of the SU(N) algebra, the topological term, and the existence of the instanton-type solutions in the continuum limit of the antiferromagnetic systems.

S. Randjbar-Daemi; Abdus Salam; J. Strathdee

1993-08-01T23:59:59.000Z

330

Polytype control of spin qubits in silicon carbide  

E-Print Network [OSTI]

Crystal defects can confine isolated electronic spins and are promising candidates for solid-state quantum information. Alongside research focusing on nitrogen vacancy centers in diamond, an alternative strategy seeks to identify new spin systems with an expanded set of technological capabilities, a materials driven approach that could ultimately lead to "designer" spins with tailored properties. Here, we show that the 4H, 6H and 3C polytypes of SiC all host coherent and optically addressable defect spin states, including spins in all three with room-temperature quantum coherence. The prevalence of this spin coherence shows that crystal polymorphism can be a degree of freedom for engineering spin qubits. Long spin coherence times allow us to use double electron-electron resonance to measure magnetic dipole interactions between spin ensembles in inequivalent lattice sites of the same crystal. Together with the distinct optical and spin transition energies of such inequivalent spins, these interactions provide ...

Falk, Abram L; Calusine, Greg; Koehl, William F; Dobrovitski, Viatcheslav V; Politi, Alberto; Zorman, Christian A; Feng, Philip X -L; Awschalom, David D; 10.1038/ncomms2854

2013-01-01T23:59:59.000Z

331

Measurement of the CKM Angle Alpha at BaBar  

SciTech Connect (OSTI)

We present BABAR experiment studies to measure the CKM angle {alpha} of the Unitarity Triangle. The measurements are based on the B meson decays into the two-body state ({pi}{pi}), the quasi two-body state ({rho}{rho}), and the three-body state ({pi}{sup +}{pi}{sup -}{pi}{sup 0}). The results are obtained from data samples of about 230 million {Upsilon}(4S) {yields} B{bar B} decays collected between 1999 and 2004 with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC.

Yeche, C.; /Saclay

2006-04-14T23:59:59.000Z

332

Flipping Photoelectron Spins in Topological Insulators  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Flipping Photoelectron Spins in Flipping Photoelectron Spins in Topological Insulators Flipping Photoelectron Spins in Topological Insulators Print Tuesday, 23 April 2013 10:00 Inherently strange crystalline materials called 3D topological insulators (TIs) are all the rage in materials science. This new phase of condensed matter is an insulator in the bulk, yet behaves like a metal on its surface, even at room temperature. The electrons that flow swiftly across the surfaces of TIs are "spin polarized", meaning the electron's spin is locked to its momentum, perpendicular to the direction of travel. These electronic states already promise many uses, but ALS researchers working at Beamline 4.0.3 with a team from Berkeley Lab and the University of California, Berkeley have just made an unexpected discovery about TIs that will broaden their possible range of applications: when hit with a photon beam, the spin polarization of the electrons they emit (in a process called photoemission) can be completely controlled in three dimensions, simply by tuning the polarization of the incident light. This strong effect was not what had been assumed about photoemission from topological insulators, or any other material. Controlling the interaction of polarized light and photoelectron spin opens a wide range of possibilities for TIs.

333

Experimental Heat-Bath Cooling of Spins  

E-Print Network [OSTI]

Algorithmic cooling (AC) is a method to purify quantum systems, such as ensembles of nuclear spins, or cold atoms in an optical lattice. When applied to spins, AC produces ensembles of highly polarized spins, which enhance the signal strength in nuclear magnetic resonance (NMR). According to this cooling approach, spin-half nuclei in a constant magnetic field are considered as bits, or more precisely, quantum bits, in a known probability distribution. Algorithmic steps on these bits are then translated into specially designed NMR pulse sequences using common NMR quantum computation tools. The $algorithmic$ cooling of spins is achieved by alternately combining reversible, entropy-preserving manipulations (borrowed from data compression algorithms) with $selective$ $reset$, the transfer of entropy from selected spins to the environment. In theory, applying algorithmic cooling to sufficiently large spin systems may produce polarizations far beyond the limits due to conservation of Shannon entropy. Here, only selective reset steps are performed, hence we prefer to call this process "heat-bath" cooling, rather than algorithmic cooling. We experimentally implement here two consecutive steps of selective reset that transfer entropy from two selected spins to the environment. We performed such cooling experiments with commercially-available labeled molecules, on standard liquid-state NMR spectrometers. Our experiments yielded polarizations that $bypass$ $Shannon's$ $entropy$-$conservation$ $bound$, so that the entire spin-system was cooled. This paper was initially submitted in 2005, first to Science and then to PNAS, and includes additional results from subsequent years (e.g. for resubmission in 2007). The Postscriptum includes more details.

Gilles Brassard; Yuval Elias; José M. Fernandez; Haggai Gilboa; Jonathan A. Jones; Tal Mor; Yossi Weinstein; Li Xiao

2014-04-28T23:59:59.000Z

334

Dual-Color Auto-Calibration Scanning-Angle Evanescent Field Microscope...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

to be complete within minutes, and incident angles in the full range (from subcritical angles to nearly 90) with intervals as small as 0.02 were identified.Technology...

335

E-Print Network 3.0 - anatomical joint angles Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Summary: A,B. Phases of the back-wipe. A Anatomical angles at the hip, knee, ankle and metatarsal joints... on anatomical angles) for selected stimulus posi- tions along...

336

Assessing the Accuracy of Contact Angle Measurements for Sessile Drops on Liquid-Repellent Surfaces  

E-Print Network [OSTI]

Gravity-induced sagging can amplify variations in goniometric measurements of the contact angles of sessile drops on super-liquid-repellent surfaces. The very large value of the effective contact angle leads to increased ...

Srinivasan, Siddarth

337

E-Print Network 3.0 - angle-dependent magnetic quantum Sample...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Mary C. Gurak12 Summary: Deg, h a2 Temperature Dependence of the EPR in max magnetic field Angle Dependence of the modified... . By analyzing the temperature and angle...

338

Pitch angle scattering and synchrotron radiation of relativistic runaway electrons in tokamak stochastic magnetic fields  

E-Print Network [OSTI]

Pitch angle scattering and synchrotron radiation of relativistic runaway electrons in tokamak is of a very different nature leading to a pitch angle scattering process which, under proper conditions, may

Martín-Solís, José Ramón

339

E-Print Network 3.0 - angle measure technique Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

time-reversal of ultrasonic waves in the vicinity of the Rayleigh angle at a fluid-solid interface Summary: angle to measure the speed of sound in solids without measuring waves...

340

E-Print Network 3.0 - angle measurement system Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

time-reversal of ultrasonic waves in the vicinity of the Rayleigh angle at a fluid-solid interface Summary: angle to measure the speed of sound in solids without measuring waves...

Note: This page contains sample records for the topic "magic angle spinning" 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

E-Print Network 3.0 - aux petits angles Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

petits angles Search Powered by Explorit Topic List Advanced Search Sample search results for: aux petits angles Page: << < 1 2 3 4 5 > >> 1 DMONSTRATION LMENTAIRE DU MINIMUM DE...

342

E-Print Network 3.0 - angle of repose Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

lower than the angle of repose of a pile formed by slowly pouring particles... of inclination of the surface which is lower than the angle of repose for a pile formed by...

343

E-Print Network 3.0 - angle-resolved two-dimensional mapping...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Rettig... in an energy- and angle-resolved manner. To achieve this, a field free drift tube with an acceptance angle... of 22 is combined with two-dimensional position-sensitive...

344

E-Print Network 3.0 - angle annular dark-field Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

search results for: angle annular dark-field Page: << < 1 2 3 4 5 > >> 1 Electron tomography of Pt nanocatalyst particles and their carbon support Summary: of high and low angle...

345

Improved Superlinks for Higher Spin Operators  

E-Print Network [OSTI]

Traditional smearing or blocking techniques serve well to increase the overlap of operators onto physical states but allow for links orientated only along lattice axes. Recent attempts to construct more general propagators have shown promise at resolving the higher spin states but still rely on iterative smearing. We present a new method of superlink construction which creates meared links from (sparse) matrix multiplications, allowing for gluonic propagation in arbitrary directions. As an application and example, we compute the positive-parity, even-spin glueball spectrum up to spin 6 for pure gauge SU(2) at beta = 6, L = 16, in D = 2+1 dimensions.

Robert W. Johnson

2007-10-12T23:59:59.000Z

346

Current heating induced spin Seebeck effect  

SciTech Connect (OSTI)

A measurement technique for the spin Seebeck effect is presented, wherein the normal metal layer used for its detection is exploited simultaneously as a resistive heater and thermometer. We show how the various contributions to the measured total signal can be disentangled, allowing to extract the voltage signal solely caused by the spin Seebeck effect. To this end, we performed measurements as a function of the external magnetic field strength and its orientation. We find that the effect scales linearly with the induced rise in temperature, as expected for the spin Seebeck effect.

Schreier, Michael, E-mail: michael.schreier@wmi.badw.de; Roschewsky, Niklas; Dobler, Erich; Meyer, Sibylle; Huebl, Hans; Goennenwein, Sebastian T. B. [Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching (Germany)] [Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching (Germany); Gross, Rudolf [Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching (Germany) [Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching (Germany); Physik-Department, Technische Universität München, Garching (Germany)

2013-12-09T23:59:59.000Z

347

A novel solid-angle tomosynthesis (SAT) scanning scheme  

SciTech Connect (OSTI)

Purpose: Digital tomosynthesis (DTS) recently gained extensive research interests in both diagnostic and radiation therapy fields. Conventional DTS images are generated by scanning an x-ray source and flat-panel detector pair on opposite sides of an object, with the scanning trajectory on a one-dimensional curve. A novel tomosynthesis method named solid-angle tomosynthesis (SAT) is proposed, where the x-ray source scans on an arbitrary shaped two-dimensional surface. Methods: An iterative algorithm in the form of total variation regulated expectation maximization is developed for SAT image reconstruction. The feasibility and effectiveness of SAT is corroborated by computer simulation studies using three-dimensional (3D) numerical phantoms including a 3D Shepp-Logan phantom and a volumetric CT image set of a human breast. Results: SAT is able to cover more space in Fourier domain more uniformly than conventional DTS. Greater coverage and more isotropy in the frequency domain translate to fewer artifacts and more accurately restored features in the in-plane reconstruction. Conclusions: Comparing with conventional DTS, SAT allows cone-shaped x-ray beams to project from more solid angles, thus provides more coverage in the spatial-frequency domain, resulting in better quality of reconstructed image.

Zhang Jin; Yu, Cedric [Department of Radiation Oncology, University of Maryland School of Medicine, 22 S. Greene Street, Baltimore, Maryland 21201 and Xcision Medical System, LLC, 12707 Chapel Chase Drive, Clarksville, Maryland 21209 (United States)

2010-08-15T23:59:59.000Z

348

Incoherent photoproduction of pseudoscalar mesons off nuclei at forward angles  

SciTech Connect (OSTI)

Recent advances in the photon tagging facilities together with the novel, high-resolution fast calorimetry make it possible to perform photoproduction cross section measurements of pseudoscalar mesons on nuclei with a percent level accuracy. The extraction of the radiative decay widths, needed for testing the symmetry breaking effects in QCD, from these measurements at small angles is done by the Primakoff method. This method requires theoretical treatment of all processes participating in these reactions at the same percent level. The most updated description of general processes, including the nuclear coherent amplitude, is done in our previous paper. In this work, in the framework of the Glauber multiple scattering theory, we obtain analytical expressions for the incoherent cross section of the photoproduction of pseudoscalar mesons off nuclei accounting for the mesons absorption in nuclei and the Pauli suppression at forward production angles. As illustrations of the obtained formulas, we calculate the incoherent cross section for photoproduction from a closed shell nucleus, {sup 16}O, and from an unclosed shell nucleus, {sup 12}C. These calculations allow one to compare different approaches and estimate their impact on the incoherent cross section of the processes under consideration.

Gevorgyan, Sergey [JINR; Gasparian, Ashot H. [North Carolina Ag. and Tech. St. U; Gan, Liping [University of North Carolina at Wilmington; Larin, Ilya F. [ITEP, Moscow; Khandaker, Mahbubul A. [Idaho State U

2012-01-01T23:59:59.000Z

349

G0 Electronics and Data Acquisition (Forward-Angle Measurements)  

SciTech Connect (OSTI)

The G$^0$ parity-violation experiment at Jefferson Lab (Newport News, VA) is designed to determine the contribution of strange/anti-strange quark pairs to the intrinsic properties of the proton. In the forward-angle part of the experiment, the asymmetry in the cross section was measured for $\\vec{e}p$ elastic scattering by counting the recoil protons corresponding to the two beam-helicity states. Due to the high accuracy required on the asymmetry, the G$^0$ experiment was based on a custom experimental setup with its own associated electronics and data acquisition (DAQ) system. Highly specialized time-encoding electronics provided time-of-flight spectra for each detector for each helicity state. More conventional electronics was used for monitoring (mainly FastBus). The time-encoding electronics and the DAQ system have been designed to handle events at a mean rate of 2 MHz per detector with low deadtime and to minimize helicity-correlated systematic errors. In this paper, we outline the general architecture and the main features of the electronics and the DAQ system dedicated to G$^0$ forward-angle measurements.

D. Marchand; J. Arvieux; L. Bimbot; A. Biselli; J. Bouvier; H. Breuer; R. Clark; J.-C. Cuzon; M. Engrand; R. Foglio; C. Furget; X. Grave; B. Guillon; H. Guler; P.M. King; S. Kox; J. Kuhn; Y. Ky; J. Lachniet; J. Lenoble; E. Liatard; J. Liu; E. Munoz; J. Pouxe; G. Quéméne; B. Quinn; J.-S. Réal; O. Rossetto; R. Sellem

2007-04-18T23:59:59.000Z

350

E-Print Network 3.0 - angle scattering techniques Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

angle ... Source: Ecole Polytechnique, Centre de mathmatiques Collection: Mathematics 2 Neutron Scattering in Polymer Micelle Characterization Summary: - Nondestructive technique...

351

E-Print Network 3.0 - angle cutting tools Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

edge angle Process type ... Source: Grninger, Michael - Department of Mechanical and Industrial Engineering, University of Toronto Collection: Computer Technologies and...

352

The feasibility study and characterization of a two-dimensional diode array in “magic phantom” for high dose rate brachytherapy quality assurance  

SciTech Connect (OSTI)

Purpose: High dose rate (HDR) brachytherapy is a radiation treatment technique capable of delivering large dose rates to the tumor. Radiation is delivered using remote afterloaders to drive highly active sources (commonly {sup 192}Ir with an air KERMA strength range between 20 000 and 40 000 U, where 1 U = 1 ?Gy m{sup 2}/h in air) through applicators directly into the patient's prescribed region of treatment. Due to the obvious ramifications of incorrect treatment while using such an active source, it is essential that there are methods for quality assurance (QA) that can directly and accurately verify the treatment plan and the functionality of the remote afterloader. This paper describes the feasibility study of a QA system for HDR brachytherapy using a phantom based two-dimensional 11 × 11 epitaxial diode array, named “magic phantom.”Methods: The HDR brachytherapy treatment plan is translated to the phantom with two rows of 10 (20 in total) HDR source flexible catheters, arranged above and below the diode array “magic plate” (MP). Four-dimensional source tracking in each catheter is based upon a developed fast iterative algorithm, utilizing the response of the diodes in close proximity to the {sup 192}Ir source, sampled at 100 ms intervals by a fast data acquisition (DAQ) system. Using a {sup 192}Ir source in a solid water phantom, the angular response of the developed epitaxial diodes utilized in the MP and also the variation of the MP response as a function of the source-to-detector distance (SDD) were investigated. These response data are then used by an iterative algorithm for source dwelling position determination. A measurement of the average transit speed between dwell positions was performed using the diodes and a fast DAQ.Results: The angular response of the epitaxial diode showed a variation of 15% within 360°, with two flat regions above and below the detector face with less than 5% variation. For SDD distances of between 5 and 30 mm the relative response of the epitaxial diodes used in the MP is in good agreement (within 8%) with radial dose function measurements found within the TG-43 protocol, with SDD of up to 70 mm showing a 40% over response. A method for four-dimensional localization of the HDR source was developed, allowing the source dwell position to be derived within 0.50 mm of the expected position. An estimation of the average transit speed for varying step sizes was determined and was found to increase from (12.8 ± 0.3) up to (38.6 ± 0.4) cm/s for a step size of 2.5 and 50 mm, respectively.Conclusions: Our characterization of the designed QA “magic phantom” with MP in realistic HDR photon fields demonstrates the promising performance for real-time source position tracking in four dimensions and measurements of transit times. Further development of this system will allow a full suite for QA in HDR brachytherapy and analysis, and for future in vivo tracking.

Espinoza, A.; Beeksma, B.; Petasecca, M.; Fuduli, I.; Porumb, C.; Cutajar, D.; Lerch, M. L. F.; Rosenfeld, A. B. [Centre for Medical Radiation Physics, University of Wollongong, New South Wales 2522 (Australia)] [Centre for Medical Radiation Physics, University of Wollongong, New South Wales 2522 (Australia); Corde, S.; Jackson, M. [Department of Radiation Oncology, Prince of Wales Hospital, New South Wales 2031 (Australia)] [Department of Radiation Oncology, Prince of Wales Hospital, New South Wales 2031 (Australia)

2013-11-15T23:59:59.000Z

353

Dynamic control of spin wave spectra using spin-polarized currents  

SciTech Connect (OSTI)

We describe a method of controlling the spin wave spectra dynamically in a uniform nanostripe waveguide through spin-polarized currents. A stable periodic magnetization structure is observed when the current flows vertically through the center of nanostripe waveguide. After being excited, the spin wave is transmitted at the sides of the waveguide. Numerical simulations of spin-wave transmission and dispersion curves reveal a single, pronounced band gap. Moreover, the periodic magnetization structure can be turned on and off by the spin-polarized current. The switching process from full rejection to full transmission takes place within less than 3?ns. Thus, this type magnonic waveguide can be utilized for low-dissipation spin wave based filters.

Wang, Qi; Zhang, Huaiwu, E-mail: hwzhang@uestc.edu.cn; Tang, Xiaoli; Bai, Feiming; Zhong, Zhiyong, E-mail: zzy@uestc.edu.cn [State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054 (China); Fangohr, Hans [Faculty of Engineering and the Environment, University of Southampton, Southampton SO17 1BJ (United Kingdom)

2014-09-15T23:59:59.000Z

354

Manipulation of the spin-orbit coupling using the Dirac equation for spin-dependent potentials  

Science Journals Connector (OSTI)

A scheme is presented that allows one to decompose the spin-orbit coupling operator into two parts within calculations based on the Dirac equation for spin-dependent potentials. The first term lifts energetic degeneracies but leaves the spin as a good quantum number, while the second term causes hybridization of states with a different spin character. To investigate the importance of these terms and of the mechanism connected to them a number of model calculations for the dispersion relation, the spin-orbit-induced orbital magnetic moment, and the magneto-optical Kerr effect in several transition metal systems have been performed by retaining just one of them. In all cases studied it was found that the first term is by far the most important source for spin-orbit-induced phenomena.

H. Ebert, H. Freyer, and M. Deng

1997-10-15T23:59:59.000Z

355

Efficient readout of a single spin state in diamond via spin-to-charge conversion  

E-Print Network [OSTI]

Efficient readout of individual electronic spins associated with atom-like impurities in the solid state is essential for applications in quantum information processing and quantum metrology. We demonstrate a new method for efficient spin readout of nitrogen-vacancy (NV) centers in diamond. The method is based on conversion of the electronic spin state of the NV to a charge state distribution, followed by single-shot readout of the charge state. Conversion is achieved through a spin-dependent photoionization process in diamond at room temperature. Using NVs in nanofabricated diamond beams, we demonstrate that the resulting spin readout noise is within a factor of three of the spin projection noise level. Applications of this technique for nanoscale magnetic sensing are discussed.

B. J. Shields; Q. P. Unterreithmeier; N. P. de Leon; H. Park; M. D. Lukin

2014-10-01T23:59:59.000Z

356

Detection of surface mobility of poly (2, 3, 4, 5, 6-pentafluorostyrene) films by in situ variable-temperature ToF-SIMS and contact angle measurements  

Science Journals Connector (OSTI)

Abstract Poly (2, 3, 4, 5, 6-pentafluorostyrene) (5FPS) was prepared by bulk radical polymerization. The spin-cast films of this polymer were analyzed using time-of-flight secondary ion mass spectrometry (ToF-SIMS) at various temperatures ranging from room temperature to 120 °C. Principal component analysis (PCA) of the ToF-SIMS data revealed a transition temperature (TT) at which the surface structure of 5FPS was rearranged. A comparison between the results of the PCA of ToF-SIMS spectra obtained on 5FPS and polystyrene (PS) indicate that the pendant groups of 5FPS and PS moved in exactly opposite directions as the temperature increased. More pendant groups of 5FPS and PS migrated from the bulk to the surface and verse versa, respectively, as the temperature increased. These results clearly support the view that the abrupt changes in the normalized principal component 1 value was caused by the surface reorientation of the polymers and not by a change in the ion fragmentation mechanism at temperatures above the TT. Contact angle measurement, which is another extremely surface sensitive technique, was used to monitor the change in the surface tension as a function of temperature. A clear TT was determined by the contact angle measurements. The TT values determined by contact angle measurements and ToF-SIMS were very similar.

Yi Fu; Yiu-Ting R. Lau; Lu-Tao Weng; Kai-Mo Ng; Chi-Ming Chan

2014-01-01T23:59:59.000Z

357

Rotation Angle for the Optimum Tracking of One-Axis Trackers  

SciTech Connect (OSTI)

An equation for the rotation angle for optimum tracking of one-axis trackers is derived along with equations giving the relationships between the rotation angle and the surface tilt and azimuth angles. These equations are useful for improved modeling of the solar radiation available to a collector with tracking constraints and for determining the appropriate motor revolutions for optimum tracking.

Marion, W. F.; Dobos, A. P.

2013-07-01T23:59:59.000Z

358

hal-00154048,version1-12Jun2007 The new very small angle neutron scattering  

E-Print Network [OSTI]

hal-00154048,version1-12Jun2007 The new very small angle neutron scattering spectrometer The design and characteristics of the new very small angle neutron scattering spectrometer under construction in order to fill the gap between light scattering and classical small angle neutron scattering (SANS

Boyer, Edmond

359

Design of angle-tolerant multivariate optical elements for chemical imaging  

E-Print Network [OSTI]

Design of angle-tolerant multivariate optical elements for chemical imaging Olusola O. Soyemi in imaging applications. We report a method for the design of angle-insensitive MOEs based on modification of Bismarck Brown and Crystal Violet, was designed and its performance simulated. For angles of incidence

Myrick, Michael Lenn

360

Pitch angle scattering of an energetic magnetized particle by a circularly polarized electromagnetic wave  

E-Print Network [OSTI]

Pitch angle scattering of an energetic magnetized particle by a circularly polarized://pop.aip.org/features/most_downloaded Information for Authors: http://pop.aip.org/authors #12;Pitch angle scattering of an energetic magnetized valley, but for finite mismatch, there can be two valleys separated by a hill. A large pitch angle

Bellan, Paul M.

Note: This page contains sample records for the topic "magic angle spinning" 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

Direct Detection of Resonant Electron Pitch Angle Scattering by Whistler Waves in a Laboratory Plasma  

E-Print Network [OSTI]

Direct Detection of Resonant Electron Pitch Angle Scattering by Whistler Waves in a Laboratory on the first laboratory experiment to directly detect resonant pitch angle scattering of energetic (ke or less, making it difficult to detect changes in electron pitch angle. A review of observations

California at Los Angles, University of

362

Pitch angle distribution analysis of radiation belt electrons based on Combined Release and Radiation Effects Satellite  

E-Print Network [OSTI]

Pitch angle distribution analysis of radiation belt electrons based on Combined Release of pitch angle distributions (PADs) of energetic electrons is performed. The distributions are classified a is the local pitch angle, a profile of the parameter n versus L-shell is produced for local times corresponding

Li, Xinlin

363

LimitedAngle Computed Tomography for Sandwich Structures using Data Fusion  

E-Print Network [OSTI]

1 Limited­Angle Computed Tomography for Sandwich Structures using Data Fusion Jeffrey E. Boyd and limited­angle computed­tomography (CT) are ill­posed problems, but where conventional CT has a small null. #12; 2 1. INTRODUCTION This paper presents a novel method for limited­angle computed tomography (CT

Boyd, Jeffrey E.

364

Better Buildings Neighborhood Program: Program Offers New Spin on  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Program Offers Program Offers New Spin on Traditional Marketing to someone by E-mail Share Better Buildings Neighborhood Program: Program Offers New Spin on Traditional Marketing on Facebook Tweet about Better Buildings Neighborhood Program: Program Offers New Spin on Traditional Marketing on Twitter Bookmark Better Buildings Neighborhood Program: Program Offers New Spin on Traditional Marketing on Google Bookmark Better Buildings Neighborhood Program: Program Offers New Spin on Traditional Marketing on Delicious Rank Better Buildings Neighborhood Program: Program Offers New Spin on Traditional Marketing on Digg Find More places to share Better Buildings Neighborhood Program: Program Offers New Spin on Traditional Marketing on AddThis.com... Better Buildings Residential Network

365

Electrically driven spin resonance in silicon carbide color centers  

E-Print Network [OSTI]

We demonstrate that the spin of optically addressable point defects can be coherently driven with AC electric fields. Based on magnetic-dipole forbidden spin transitions, this scheme enables spatially confined spin control, the imaging of high-frequency electric fields, and the characterization of defect spin multiplicity. While we control defects in SiC, these methods apply to spin systems in many semiconductors, including the nitrogen-vacancy center in diamond. Electrically driven spin resonance offers a viable route towards scalable quantum control of electron spins in a dense array.

P. V. Klimov; A. L. Falk; B. B. Buckley; D. D. Awschalom

2013-10-17T23:59:59.000Z

366

Dynamics of spin-flip photon-assisted tunneling  

Science Journals Connector (OSTI)

We present time-resolved measurements of spin-flip photon-assisted tunneling and spin-flip relaxation in a doubly occupied double quantum dot. The photon-assisted excitation rate as a function of magnetic field indicates that spin-orbit coupling is the dominant mechanism behind the spin-flip under the present conditions. We are able to extract the resulting effective “spin-flip tunneling” energy, which is found to be three orders of magnitude smaller than the regular spin-conserving tunneling energy. We also measure the relaxation and dephasing times of a qubit formed out of two two-electron states with different spin and charge configurations.

F. R. Braakman; J. Danon; L. R. Schreiber; W. Wegscheider; L. M. K. Vandersypen

2014-02-18T23:59:59.000Z

367

Intrinsic Spin-Orbit Interaction in Graphene  

E-Print Network [OSTI]

In graphene, we report the first theoretical demonstration of how the intrinsic spin orbit interaction can be deduced from the theory and how it can be controlled by tuning a uniform magnetic field, and/or by changing the strength of a long range Coulomb like impurity (adatom), as well as gap parameter. In the impurity context, we find that intrinsic spin-orbit interaction energy may be enhanced by increasing the strength of magnetic field and/or by decreasing the band gap mass term. Additionally, it may be strongly enhanced by increasing the impurity strength. Furthermore, from the proposal of Kane and Mele [Phys. Rev. Lett. 95, 226801 (2005)], it was discussed that the pristine graphene has a quantized spin Hall effect regime where the Rashba type spin orbit interaction term is smaller than that of intrinsic one. Our analysis suggest the nonexistence of such a regime in the ground state of flat graphene.

B. S. Kandemir

2012-05-03T23:59:59.000Z

368

Optical pumping production of spin polarized hydrogen  

SciTech Connect (OSTI)

There has been much interest recently in the production of large quantities of spin polarized hydrogen in various fields, including controlled fusion, quantum fluids, high energy, and nuclear physics. One promising method for the development of large quantities of spin polarized hydrogen is the utilization of optical pumping with a laser. Optical pumping is a process in which photon angular momentum is converted into electron and nuclear spin. The advent of tunable CW dye lasers (approx. 1 watt) allows the production of greater than 10/sup 18/ polarized atoms/sec. We have begun a program at Princeton to investigate the physics and technology of using optical pumping to produce large quantities of spin polarized hydrogen. Initial experiments have been done in small closed glass cells. Eventually, a flowing system, open target, or polarized ion source could be constructed.

Knize, R.J.; Happer, W.; Cecchi, J.L.

1984-09-01T23:59:59.000Z

369

Neutron Scattering and Ordering of Nuclear Spins  

Science Journals Connector (OSTI)

The ordering of nuclear spins takes place at extremely low temperatures because of the weakness of the interactions between their magnetic moments. Neutron scattering is the traditional and unique method to ... (...

M. Steiner

2004-06-01T23:59:59.000Z

370

Spin effects in single-electron transistors  

E-Print Network [OSTI]

Basic electron transport phenomena observed in single-electron transistors (SETs) are introduced, such as Coulomb-blockade diamonds, inelastic cotunneling thresholds, the spin-1/2 Kondo effect, and Fano interference. With ...

Granger, Ghislain

2005-01-01T23:59:59.000Z

371

Muon Spin Rotation Studies of Enediynes  

Science Journals Connector (OSTI)

The muon spin plays the role of a nuclear spin, but the spectroscopy proves to be equally sensitive both to muons in electronically diamagnetic environments and to those which experience a hyperfine coupling with paramagnetic electrons, the latter being of importance to the studies involving organic radicals. ... The samples were mounted in a cryostat and exposed to the beam of spin-polarized positive muons while an external magnetic field of 0.2 T was applied transverse to the muon (spin) beam direction. ... To correlate a positron decay with a muon incident on the sample, the experiment was run in time differential mode in which the incoming muon starts a clock at t = 0 and in so doing triggers a gate signal of 10 ?s length (a few muon lifetimes) during which no further muons can be counted. ...

Vasily S. Oganesyan; Andrew N. Cammidge; Gareth A. Hopkins; Fiona M. Cotterill; Ivan D. Reid; Upali A. Jayasooriya

2004-02-17T23:59:59.000Z

372

Storage rings for spin-polarized hydrogen  

Science Journals Connector (OSTI)

A strong-focusing storage ring is proposed for the long-term magnetic confinement of a collisional gas of neutral spin-polarized hydrogen atoms in the |a? and |b? hyperfine states. The...

Thompson, D; Lovelace, R V E; Lee, D M

1989-01-01T23:59:59.000Z

373

Entropy production in quantum spin systems  

E-Print Network [OSTI]

We consider a quantum spin system consisting of a finite subsystem connected to infinite reservoirs at different temperatures. In this setup we define nonequilibrium steady states and prove that the rate of entropy production in such states is nonnegative.

David Ruelle

2000-06-07T23:59:59.000Z

374

High-Resolution Solid-State Nuclear Magnetic Resonance Experiments on Highly Radioactive Ceramics  

SciTech Connect (OSTI)

A triple containment magic-angle spinning rotor insert system has been developed and a sample handling procedure formulated for safety analyzing highly radioactive solids by high resolution solid state NMR. The protocol and containment system have been demonstrated for magic angle spinning (MAS) experiments on ceramic samples containing 5-10 wt% 239Pu and 238Pu at rotation speeds of 3500 Hz. The technique has been used to demonstrate that MASNMR experiments can be used to measure amorphous atomic number fractions produced during accelerated internal radioactive decay. This will allow incorporated ?-emitters with short half-lives to be used to model the long-term radiation tolerance of potential ceramic radioactive waste forms. It is believed to be the first example of MASNMR spectroscopy on samples containing fissionable isotopes.

Farnan, Ian E.; Cho, Herman M.; Weber, William J.; Scheele, Randall D.; Johnson, Nigel R.; Kozelisky, Anne E.

2004-12-01T23:59:59.000Z

375

ANALYSIS OF SPIN-ORBIT ALIGNMENT IN THE WASP-32, WASP-38, AND HAT-P-27/WASP-40 SYSTEMS  

SciTech Connect (OSTI)

We present measurements of the spin-orbit alignment angle, {lambda}, for the hot Jupiter systems WASP-32, WASP-38, and HAT-P-27/WASP-40, based on data obtained using the HARPS spectrograph. We analyze the Rossiter-McLaughlin effect for all three systems and also carry out Doppler tomography for WASP-32 and WASP-38. We find that WASP-32 (T {sub eff} = 6140{sup +90} {sub -100} K) is aligned, with an alignment angle of {lambda} = 10.{sup 0}5{sup +6.4} {sub -6.5} obtained through tomography, and that WASP-38 (T {sub eff} = 6180{sup +40} {sub -60} K) is also aligned, with tomographic analysis yielding {lambda} = 7.{sup 0}5{sup +4.7} {sub -6.1}. The latter result provides an order-of-magnitude improvement in the uncertainty in {lambda} compared to the previous analysis of Simpson et al. We are only able to loosely constrain the angle for HAT-P-27/WASP-40 (T{sub eff} = 5190{sup +160} {sub -170} K) to {lambda} = 24.{sup 0}2{sup +76.0}{sub -44.5}, owing to the poor signal-to-noise ratio of our data. We consider this result a non-detection under a slightly updated version of the alignment test of Brown et al. We place our results in the context of the full sample of spin-orbit alignment measurements, finding that they provide further support for previously established trends.

Brown, D. J. A.; Collier Cameron, A.; Enoch, B.; Miller, G. R. M. [SUPA, School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife KY16 9SS (United Kingdom); Diaz, R. F. [LAM (Laboratoire d'Astrophysique de Marseille), Aix Marseille Universite, CNRS, UMR 7326, F-13388 Marseille (France); Doyle, A. P.; Smalley, B.; Anderson, D. R.; Hellier, C.; Maxted, P. F. L. [Astrophysics Group, School of Physical and Geographical Sciences, Lennard-Jones Building, Keele University, Staffordshire ST5 5BG (United Kingdom); Gillon, M. [Institut d'Astrophysique et de Geophysique, Universite de Liege, Allee du 6 Aout, 17 (Bat. B5C) Sart Tilman, B-4000 Liege (Belgium); Lendl, M.; Triaud, A. H. M. J.; Queloz, D. [Observatoire Astronomique de l'Universite de Geneve, 51 Chemin des Maillettes, CH-1290 Sauverny (Switzerland); Pollacco, D. [Astrophysics Research Centre, School of Mathematics and Physics, Queen's University, University Road, Belfast BT7 1NN (United Kingdom); Boisse, I. [Centro de Astrofisica, Universidade do Porto, Rua das Estrelas, 4150-762 Porto (Portugal); Hebrard, G., E-mail: djab@st-andrews.ac.uk [Institut dAstrophysique de Paris, UMR7095 CNRS, Universite Pierre and Marie Curie, 98bis boulevard Arago, F-75014 Paris (France)

2012-12-01T23:59:59.000Z

376

Transverse Ising model with arbitrary spin  

Science Journals Connector (OSTI)

An effective-field theory that has recently been used for studying higher-spin Ising models is herein extended to the transverse Ising model with an arbitrary spin S. The general formulation for evaluating the transition line in the ?-T space and relevant statistical-mechanical quantities is derived. Numerical results are performed and analyzed for the particular cases S=3/2 and S=2.

T. Kaneyoshi; M. Jaš?ur; I. P. Fittipaldi

1993-07-01T23:59:59.000Z

377

Ising Model with Four-Spin Interactions  

Science Journals Connector (OSTI)

It is shown that Baxter's recent results on a lattice-statistical model lead to the solution of an Ising model with two- and four-spin interactions. Critical properties of this Ising model in various regions of the parameter space are given. It is argued that four-spin or crossing interactions in a two-dimensional Ising model would in general lead to a critical exponent ???0.

F. W. Wu

1971-10-01T23:59:59.000Z

378

New Results on Nucleon Spin Structure  

E-Print Network [OSTI]

Recent precision spin structure data from Jefferson Lab have significantly advanced our knowledge of nucleon structure in the valence quark (high-$x$) region and improved our understanding of higher-twist effects, spin sum rules and quark-hadron duality. First, results of a precision measurement of the neutron spin asymmetry, $A_1^n$, in the high-$x$ region are discussed. The new data shows that $A_1^n$ becomes positive at high $x$. They provide crucial input for the global fits to world data to extract polarized parton distribution functions. The up and down quark spin distributions in the nucleon were extracted. The results for $\\Delta d/d$ disagree with the leading-order pQCD prediction assuming hadron helicity conservation. Then, results of a precision measurement of the $g_2^n$ structure function to study higher-twist effects are presented. The data show a clear deviation from the lead-twist contribution. The second moment of the spin structure functions and the twist-3 matrix element $d_2^n$ results were extracted at a high $Q2$ of 5 GeV$^2$. Results for $d_2^n$ at low-to-intermediate $Q2$ from 0.1 to 0.9 GeV$^2$ were also extracted from the JLab data. In the same $Q2$ range, the $Q2$ dependence of the moments of the nucleon spin structure functions was measured, providing a unique bridge linking the quark-gluon picture of the nucleon and the coherent hadronic picture. Sum rules and generalized forward spin polarizabilities were extracted. Finally, preliminary results were presented on the resonance spin structure functions in the $Q2$ range from 1 to 4 GeV$^2$ to study the quark-hadron duality.

Jian-ping Chen

2005-11-21T23:59:59.000Z

379

Electromagnetic and spin polarisabilities in lattice QCD  

E-Print Network [OSTI]

We discuss the extraction of the electromagnetic and spin polarisabilities of nucleons from lattice QCD. We show that the external field method can be used to measure all the electromagnetic and spin polarisabilities including those of charged particles. We then turn to the extrapolations required to connect such calculations to experiment in the context of chiral perturbation theory, finding a strong dependence on the lattice volume and quark masses.

W. Detmold; B. C. Tiburzi; A. Walker-Loud

2006-10-02T23:59:59.000Z

380

Spinning Tales about Japanese Cotton Spinning: Saxonhouse (1974) Then and Now Serguey Braguinsky and David A. Hounshell  

E-Print Network [OSTI]

1 Spinning Tales about Japanese Cotton Spinning: Saxonhouse (1974) Then and Now Serguey-era cotton spinning industry in Japan, the study of which was pioneered by Gary Saxonhouse in an article). With a history worthy of being called a tale, Japan's Meiji-era cotton spinning industry led that Asian nation

Braguinsky, Serguey

Note: This page contains sample records for the topic "magic angle spinning" 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.


381

Determination of gamma from Charmless B --> M1 M2 Decays Using U-Spin  

E-Print Network [OSTI]

In our previous paper we applied U-spin symmetry to charmless hadronic B+- --> M0 M+- decays for the purpose of precise extraction of the unitarity angle gamma. In this paper we extend our approach to neutral B0 and Bs --> M1 M2 decays. A very important feature of this method is that no assumptions regarding relative sizes of topological decay amplitudes need to be made. As a result, this method avoids an uncontrollable theoretical uncertainty that is often related to the neglect of some topological diagrams (e.g., exchange and annihilation graphs) in quark-diagrammatic approaches. In charged B+- decays, each of the four data sets, P0 P+-, P0 V+-, V0 P+- and V0 V+-, with P=pseudoscalar and V=vector, can be used to obtain a value of gamma. Among neutral decays, only experimental data in the B0, Bs --> P- P+ subsector is sufficient for a U-spin fit. Application of the U-spin approach to the current charged and neutral B decay data yields: gamma=(80^{+6}_{-8}) degrees. In this method, which is completely data dr...

Soni, A; Soni, Amarjit; Suprun, Denis A.

2007-01-01T23:59:59.000Z

382

Determination of gamma from Charmless B --> M1 M2 Decays Using U-Spin  

E-Print Network [OSTI]

In our previous paper we applied U-spin symmetry to charmless hadronic B+- --> M0 M+- decays for the purpose of precise extraction of the unitarity angle gamma. In this paper we extend our approach to neutral B0 and Bs --> M1 M2 decays. A very important feature of this method is that no assumptions regarding relative sizes of topological decay amplitudes need to be made. As a result, this method avoids an uncontrollable theoretical uncertainty that is often related to the neglect of some topological diagrams (e.g., exchange and annihilation graphs) in quark-diagrammatic approaches. In charged B+- decays, each of the four data sets, P0 P+-, P0 V+-, V0 P+- and V0 V+-, with P=pseudoscalar and V=vector, can be used to obtain a value of gamma. Among neutral decays, only experimental data in the B0, Bs --> P- P+ subsector is sufficient for a U-spin fit. Application of the U-spin approach to the current charged and neutral B decay data yields: gamma=(80^{+6}_{-8}) degrees. In this method, which is completely data driven, in a few years we should be able to obtain a model independent determination of gamma with an accuracy of O(few degrees).

Amarjit Soni; Denis A. Suprun

2006-09-08T23:59:59.000Z

383

Edge states and conformal boundary conditions in super spin chains and super sigma models  

E-Print Network [OSTI]

The sigma models on projective superspaces CP^{N+M-1|N} with topological angle theta=pi mod 2pi flow to non-unitary, logarithmic conformal field theories in the low-energy limit. In this paper, we determine the exact spectrum of these theories for all open boundary conditions preserving the full global symmetry of the model, generalizing recent work on the particular case M=0 [C. Candu et al, JHEP02(2010)015]. In the sigma model setting, these boundary conditions are associated with complex line bundles, and are labelled by an integer, related with the exact value of theta. Our approach relies on a spin chain regularization, where the boundary conditions now correspond to the introduction of additional edge states. The exact values of the exponents then follow from a lengthy algebraic analysis, a reformulation of the spin chain in terms of crossing and non-crossing loops (represented as a certain subalgebra of the Brauer algebra), and earlier results on the so-called one- and two-boundary Temperley Lieb algebras (also known as blob algebras). A remarkable result is that the exponents, in general, turn out to be irrational. The case M=1 has direct applications to the spin quantum Hall effect, which will be discussed in a sequel.

Roberto Bondesan; Jesper Lykke Jacobsen; Hubert Saleur

2011-01-23T23:59:59.000Z

384

Heliostat tilt and azimuth angle charts and the heliostat orientation protractor  

SciTech Connect (OSTI)

This paper reports that using cartesian heliostat field coordinates analytical expressions were derived for the heliostat tilt angle s, and heliostat azimuth angle {gamma} (clockwise from south). These expressions are dependent on the field cartesian coordinates of the center of the heliostat and the solar zenith and azimuth angles (clockwise from south), {theta}{sub z} and {Psi}, respectively. Here, cylindrical coordinates are conveniently used to derive the expressions for the heliostat angles s and {gamma}. The expression of {gamma}is used to construct the so-called heliostat orientation protractor. The protractor is a useful tool to determine the instantaneous heliostat azimuth angle as will be illustrated.

Elsayed, M.M.; Al-Rabghi, O.M. (Thermal Energy Dept., King Abdulaziz Univ., Jeddah 21413 (SA))

1992-02-01T23:59:59.000Z

385

Flipping Photoelectron Spins in Topological Insulators  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Flipping Photoelectron Spins in Topological Insulators Print Flipping Photoelectron Spins in Topological Insulators Print Inherently strange crystalline materials called 3D topological insulators (TIs) are all the rage in materials science. This new phase of condensed matter is an insulator in the bulk, yet behaves like a metal on its surface, even at room temperature. The electrons that flow swiftly across the surfaces of TIs are "spin polarized", meaning the electron's spin is locked to its momentum, perpendicular to the direction of travel. These electronic states already promise many uses, but ALS researchers working at Beamline 4.0.3 with a team from Berkeley Lab and the University of California, Berkeley have just made an unexpected discovery about TIs that will broaden their possible range of applications: when hit with a photon beam, the spin polarization of the electrons they emit (in a process called photoemission) can be completely controlled in three dimensions, simply by tuning the polarization of the incident light. This strong effect was not what had been assumed about photoemission from topological insulators, or any other material. Controlling the interaction of polarized light and photoelectron spin opens a wide range of possibilities for TIs.

386

Flipping Photoelectron Spins in Topological Insulators  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Flipping Photoelectron Spins in Topological Insulators Print Flipping Photoelectron Spins in Topological Insulators Print Inherently strange crystalline materials called 3D topological insulators (TIs) are all the rage in materials science. This new phase of condensed matter is an insulator in the bulk, yet behaves like a metal on its surface, even at room temperature. The electrons that flow swiftly across the surfaces of TIs are "spin polarized", meaning the electron's spin is locked to its momentum, perpendicular to the direction of travel. These electronic states already promise many uses, but ALS researchers working at Beamline 4.0.3 with a team from Berkeley Lab and the University of California, Berkeley have just made an unexpected discovery about TIs that will broaden their possible range of applications: when hit with a photon beam, the spin polarization of the electrons they emit (in a process called photoemission) can be completely controlled in three dimensions, simply by tuning the polarization of the incident light. This strong effect was not what had been assumed about photoemission from topological insulators, or any other material. Controlling the interaction of polarized light and photoelectron spin opens a wide range of possibilities for TIs.

387

Flipping Photoelectron Spins in Topological Insulators  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Flipping Photoelectron Spins in Topological Insulators Print Flipping Photoelectron Spins in Topological Insulators Print Inherently strange crystalline materials called 3D topological insulators (TIs) are all the rage in materials science. This new phase of condensed matter is an insulator in the bulk, yet behaves like a metal on its surface, even at room temperature. The electrons that flow swiftly across the surfaces of TIs are "spin polarized", meaning the electron's spin is locked to its momentum, perpendicular to the direction of travel. These electronic states already promise many uses, but ALS researchers working at Beamline 4.0.3 with a team from Berkeley Lab and the University of California, Berkeley have just made an unexpected discovery about TIs that will broaden their possible range of applications: when hit with a photon beam, the spin polarization of the electrons they emit (in a process called photoemission) can be completely controlled in three dimensions, simply by tuning the polarization of the incident light. This strong effect was not what had been assumed about photoemission from topological insulators, or any other material. Controlling the interaction of polarized light and photoelectron spin opens a wide range of possibilities for TIs.

388

Spin structure in high energy processes: Proceedings  

SciTech Connect (OSTI)

This report contains papers as the following topics: Spin, Mass, and Symmetry; physics with polarized Z{sup 0}s; spin and precision electroweak physics; polarized electron sources; polarization phenomena in quantum chromodynamics; polarized lepton-nucleon scattering; polarized targets in high energy physics; spin dynamics in storage rings and linear accelerators; spin formalism and applications to new physics searches; precision electroweak physics at LEP; recent results on heavy flavor physics from LEP experiments using 1990--1992 data; precise measurement of the left-right cross section asymmetry in Z boson production by electron-positron collisions; preliminary results on heavy flavor physics at SLD; QCD tests with SLD and polarized beams; recent results from TRISTAN at KEK; recent B physics results from CLEO; searching for the H dibaryon at Brookhaven; recent results from the compton observatory; the spin structure of the deuteron; spin structure of the neutron ({sup 3}HE) and the Bjoerken sum rule; a consumer`s guide to lattice QCD results; top ten models constrained by b {yields} sy; a review of the Fermilab fixed target program; results from the D0 experiment; results from CDF at FNAL; quantum-mechanical suppression of bremsstrahlung; report from the ZEUS collaboration at HERA; physics from the first year of H1 at HERA, and hard diffraction. These papers have been cataloged separately elsewhere.

DePorcel, L.; Dunwoodie, C. [eds.

1994-12-01T23:59:59.000Z

389

Flipping Photoelectron Spins in Topological Insulators  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Flipping Photoelectron Spins in Topological Insulators Print Flipping Photoelectron Spins in Topological Insulators Print Inherently strange crystalline materials called 3D topological insulators (TIs) are all the rage in materials science. This new phase of condensed matter is an insulator in the bulk, yet behaves like a metal on its surface, even at room temperature. The electrons that flow swiftly across the surfaces of TIs are "spin polarized", meaning the electron's spin is locked to its momentum, perpendicular to the direction of travel. These electronic states already promise many uses, but ALS researchers working at Beamline 4.0.3 with a team from Berkeley Lab and the University of California, Berkeley have just made an unexpected discovery about TIs that will broaden their possible range of applications: when hit with a photon beam, the spin polarization of the electrons they emit (in a process called photoemission) can be completely controlled in three dimensions, simply by tuning the polarization of the incident light. This strong effect was not what had been assumed about photoemission from topological insulators, or any other material. Controlling the interaction of polarized light and photoelectron spin opens a wide range of possibilities for TIs.

390

Two wide-angle imaging neutral-atom spectrometers (TWINS)  

SciTech Connect (OSTI)

Two Wide-angle Imaging Neutral-atom Spectrometers (TWINS) is a revolutionary new mission designed to stereoscopically image the magnetosphere in charge exchange neutral atoms for the first time. The authors propose to fly two identical TWINS instruments as a mission of opportunity on two widely-spaced high-altitude, high-inclination US Government spacecraft. Because the spacecraft are funded independently, TWINS can provide a vast quantity of high priority science observations (as identified in an ongoing new missions concept study and the Sun-Earth Connections Roadmap) at a small fraction of the cost of a dedicated mission. Because stereo observations of the near-Earth space environs will provide a particularly graphic means for visualizing the magnetosphere in action, and because of the dedication and commitment of the investigator team to the principles of carrying space science to the broader audience, TWINS will also be an outstanding tool for public education and outreach.

McComas, D.J. [Los Alamos National Lab., NM (United States)] [Los Alamos National Lab., NM (United States); Blake, B. [Aerospace Corp., CA (United States)] [Aerospace Corp., CA (United States); Burch, J. [Southwest Research Inst., San Antonio, TX (United States)] [and others] [Southwest Research Inst., San Antonio, TX (United States); and others

1998-11-01T23:59:59.000Z

391

Doppler shift anisotropy in small angle neutron scattering  

Science Journals Connector (OSTI)

The two-dimensional patterns in our small angle neutron scattering (SANS) experiments from rapidly moving aerosols are anisotropic. To test the kinematic theory of two-body scattering that describes the anisotropy, we conducted SANS experiments using a constant source of D2O aerosol with droplets moving at ?440 m/s, and varied the neutron velocity from 267 to 800 m/s. The theoretically predicted anisotropy of the laboratory scattering intensities agrees well with the experimental results. Based on an analysis of the scattering intensity in the Guinier region, we also determined the particle velocity. The results are in very good agreement with independent velocity estimates based on supersonic flow measurements.

B. E. Wyslouzil; G. Wilemski; J. L. Cheung; R. Strey; J. Barker

1999-10-01T23:59:59.000Z

392

Modeling Liquid Bridge between Surfaces with Contact Angle Hysteresis  

Science Journals Connector (OSTI)

Another study on the liquid bridge was done by Fortes,(12) where a theoretical model was established to obtain the profiles of axisymmetric liquid bridges between two identical parallel plates. ... In this study, according to different boundary conditions, liquid bridges were classified as ? bridge (the plates were infinite and the contact angle ? were specified at the liquid–plate boundaries) and r bridge (the plates were circular and of radius r, and the liquid–plate contact lines were pinned at the edge of the plates), and the profiles of liquid bridges in both cases were obtained at given separation between the plates. ... Both symmetric and asymmetric liquid bridges were analyzed, and the effects of CAH on the liquid bridge profile, the adhesion force, and the energy cost during a loading cycle are discussed. ...

H. Chen; A. Amirfazli; T. Tang

2013-02-20T23:59:59.000Z

393

Two wide-angle imaging neutral-atom spectrometers  

SciTech Connect (OSTI)

The Two Wide-angle Imaging Neutral-atom Spectrometers (TWINS) mission provides a new capability for stereoscopically imaging the magnetosphere. By imaging the charge exchange neutral atoms over a broad energy range (1 < E , {approximately} 100 keV) using two identical instruments on two widely-spaced high-altitude, high-inclination spacecraft, TWINS will enable the 3-dimensional visualization and the resolution of large scale structures and dynamics within the magnetosphere for the first time. These observations will provide a leap ahead in the understanding of the global aspects of the terrestrial magnetosphere and directly address a number of critical issues in the ``Sun-Earth Connections`` science theme of the NASA Office of Space Science.

McComas, D.J.

1997-12-31T23:59:59.000Z

394

Finite ballooning angle effects on ion temperature gradient driven mode in gyrokinetic flux tube simulations  

SciTech Connect (OSTI)

This paper presents effects of finite ballooning angles on linear ion temperature gradient (ITG) driven mode and associated heat and momentum flux in Gyrokinetic flux tube simulation GENE. It is found that zero ballooning angle is not always the one at which the linear growth rate is maximum. The ITG mode acquires a short wavelength (SW) branch (k{sub ?}?{sub i}?>?1) when growth rates maximized over all ballooning angles are considered. However, the SW branch disappears on reducing temperature gradient showing characteristics of zero ballooning angle SWITG in case of extremely high temperature gradient. Associated heat flux is even with respect to ballooning angle and maximizes at nonzero ballooning angle while the parallel momentum flux is odd with respect to the ballooning angle.

Singh, Rameswar, E-mail: rameswar.singh@lpp.polytechnique.fr [Institute for Plasma Research, Bhat Gandhinagar, Gujarat 2382 428 (India) [Institute for Plasma Research, Bhat Gandhinagar, Gujarat 2382 428 (India); Laboratoire de Physique des Plasmas, Ecole Polytechnique, Route de Saclay, 91128 Palaiseau Cedex (France); Brunner, S. [CRPP, Ecole Polytechnique Federale de Lausanne, CH-1015 Lausanne (Switzerland)] [CRPP, Ecole Polytechnique Federale de Lausanne, CH-1015 Lausanne (Switzerland); Ganesh, R. [Institute for Plasma Research, Bhat Gandhinagar, Gujarat 2382 428 (India)] [Institute for Plasma Research, Bhat Gandhinagar, Gujarat 2382 428 (India); Jenko, F. [Max-Planck-Institut fur Plasmaphysik, EURATOM Association, D-85748 Garching (Germany)] [Max-Planck-Institut fur Plasmaphysik, EURATOM Association, D-85748 Garching (Germany)

2014-03-15T23:59:59.000Z

395

Dynamical Crossover in an Ising Spin Glass above Tg: A Muon-Spin-Relaxation Investigation of Fe0:05TiS2  

E-Print Network [OSTI]

Dynamical Crossover in an Ising Spin Glass above Tg: A Muon-Spin-Relaxation Investigation of Fe0 of the spin-spin dynamical autocorrelation function of the Ising spin glass Fe0:05TiS2 through field dependent, 76.20.+q, 76.75.+i The Ising model with random interactions is used to describe spin glasses (SG

Keren, Amit

396

Spin-resolved Fano resonances induced large spin Seebeck effects in graphene-carbon-chain junctions  

SciTech Connect (OSTI)

We propose a high-efficiency thermospin device constructed by a carbon atomic chain sandwiched between two ferromagnetic (FM) zigzag graphene nanoribbon electrodes. In the low-temperature regime, the magnitude of the spin figure of merit is nearly equal to that of the corresponding charge figure of merit. This is attributed to the appearances of spin-resolved Fano resonances in the linear conductance spectrum resulting from the quantum interference effects between the localized states and the expanded states. The spin-dependent Seebeck effect is obviously enhanced near these Fano resonances with the same spin index; meanwhile, the Seebeck effect of the other spin component has a smaller value due to the smooth changing of the linear conductance with the spin index. Thus, a large spin Seebeck effect is achieved, and the magnitude of the spin figure of merit can reach 1.2 at T?=?25?K. Our results indicate that the FM graphene-carbon-chain junctions can be used to design the high-efficiency thermospin devices.

Liu, Yu-Shen; Zhang, Xue; Feng, Jin-Fu, E-mail: fengjinfu@cslg.edu.cn [Jiangsu Laboratory of Advanced Functional Materials and College of Physics and Engineering, Changshu Institute of Technology, Changshu 215500 (China); Wang, Xue-Feng, E-mail: xf-wang1969@yahoo.com [Department of Physics, Soochow University, Suzhou 215006 (China)

2014-06-16T23:59:59.000Z

397

Current-based detection of nonlocal spin transport in graphene for spin-based logic applications  

SciTech Connect (OSTI)

Graphene has been proposed for novel spintronic devices due to its robust and efficient spin transport properties at room temperature. Some of the most promising proposals require current-based readout for integration purposes, but the current-based detection of spin accumulation has not yet been developed. In this work, we demonstrate current-based detection of spin transport in graphene using a modified nonlocal geometry. By adding a variable shunt resistor in parallel to the nonlocal voltmeter, we are able to systematically cross over from the conventional voltage-based detection to current-based detection. As the shunt resistor is reduced, the output current from the spin accumulation increases as the shunt resistance drops below a characteristic value R*. We analyze this behavior using a one-dimensional drift-diffusion model, which accounts well for the observed behavior. These results provide the experimental and theoretical foundation for current-based detection of nonlocal spin transport.

Wen, Hua; Amamou, Walid [Department of Physics and Astronomy, University of California, Riverside, California 92521 (United States); Zhu, Tiancong; Luo, Yunqiu; Kawakami, Roland K., E-mail: roland.kawakami@ucr.edu [Department of Physics and Astronomy, University of California, Riverside, California 92521 (United States); Department of Physics, The Ohio State University, Columbus, Ohio 43210 (United States)

2014-05-07T23:59:59.000Z

398

Local realism and measured correlations in the spin-s Einstein-Podolsky-Rosen experiment  

Science Journals Connector (OSTI)

Two aspects of the Clauser-Horne conditions for the compatibility with local realism of measured spin-½ Einstein-Podolsky-Rosen correlations are investigated in the spin-s case. (1) A new set of necessary conditions is given for compatibility with local realism. These conditions are violated for a large range of geometries. The range does not diminish with increasing s, if the observed correlations are sufficiently near to the quantum-theoretic predictions. (2) A simple counterexample is given to the spin-1 generalization of a recent conjecture that the conditions tested by the Clauser-Horne spin-½ inequalities are sufficient as well as necessary for compatibility of the data with local realism.

Anupam Garg and N. D. Mermin

1983-01-15T23:59:59.000Z

399

Nuclear spin cooling using Overhauser field selective coherent population trapping  

E-Print Network [OSTI]

Hyperfine interactions with a nuclear spin environment fundamentally limit the coherence properties of confined electron spins in the solid-state. Here, we show that a quantum interference effect in optical absorption from two electronic spin states of a solid-state emitter can be used to prepare the surrounding environment of nuclear spins in well-defined states, thereby suppressing electronic spin dephasing. The evolution of the coupled electron-nuclei system into a coherent population trapping state by optical excitation induced nuclear spin diffusion can be described in terms of Levy flights, in close analogy with sub-recoil laser cooling of atoms. The large difference in electronic and nuclear time scales simultaneously allow for a measurement of the magnetic field produced by nuclear spins, making it possible to turn the lasers that cause the anomalous spin diffusion process off when the strength of the resonance fluorescence reveals that the nuclear spins are in the desired narrow state.

Mena Issler; Eric Kessler; Geza Giedke; Susanne Yelin; Ignacio Cirac; Mikhail Lukin; Atac Imamoglu

2010-08-20T23:59:59.000Z

400

Demand Response Spinning Reserve Demonstration -- Phase 2 Findings from the Summer of 2008  

E-Print Network [OSTI]

A. Barat, D. Watson. 2007. Demand Response Spinning ReserveN ATIONAL L ABORATORY Demand Response Spinning Reserveemployer. LBNL-XXXXX Demand Response Spinning Reserve

Eto, Joseph H.

2010-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "magic angle spinning" 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

HIGH RESOLUTION NMR IN INHOMOGENEOUS MAGNETIC FIELDS: APPLICATION OF TOTAL SPIN COHERENCE TRANSFER ECHOES  

E-Print Network [OSTI]

APPLICATION OF TOTAL SPIN COHERENCE TRANSFER ECHOES D.P.by total spin coherence transfer echo spectroscopy. (a) Thesequence to use total spin coherence transfer echoes to

Weitekamp, D.P.

2014-01-01T23:59:59.000Z

402

Field-induced reorientation of the spin helix in MnSi near T{sub c}  

SciTech Connect (OSTI)

The chiral spin fluctuations and the spiral structure of the single crystal MnSi has been studied by small angle polarized neutron scattering near T{sub c}=29 K under applied field. A weak magnetic field applied along one of the <111> axes produces a single domain sample with the helix wave vector along the field. The 90 degree sign reorientation of the spin spiral from the [111] axis to [110] axis is observed in the field range from 130 to 180 mT in the close vicinity to T{sub c}. Further increase of the field above 180 mT restores the original orientation of the helix and leads to the induced ferromagnetic state at 350 mT. This observation clarifies the nature of the structural spin instability found in the H-T phase diagram of MnSi by other techniques. We explain this phenomenon as a result of competition of cubic anisotropy and the spin-wave Bose condensation provoked by the field perpendicular to the helix axis.

Grigoriev, S. V.; Maleyev, S. V.; Okorokov, A. I.; Chetverikov, Yu. O. [Petersburg Nuclear Physics Institute, Gatchina, St. Petersburg 188300 (Russian Federation); Eckerlebe, H. [GKSS Forschungszentrum, 21502 Geesthacht (Germany)

2006-06-01T23:59:59.000Z

403

Calculation of nuclear spin-spin coupling constants using frozen density embedding  

SciTech Connect (OSTI)

We present a method for a subsystem-based calculation of indirect nuclear spin-spin coupling tensors within the framework of current-spin-density-functional theory. Our approach is based on the frozen-density embedding scheme within density-functional theory and extends a previously reported subsystem-based approach for the calculation of nuclear magnetic resonance shielding tensors to magnetic fields which couple not only to orbital but also spin degrees of freedom. This leads to a formulation in which the electron density, the induced paramagnetic current, and the induced spin-magnetization density are calculated separately for the individual subsystems. This is particularly useful for the inclusion of environmental effects in the calculation of nuclear spin-spin coupling constants. Neglecting the induced paramagnetic current and spin-magnetization density in the environment due to the magnetic moments of the coupled nuclei leads to a very efficient method in which the computationally expensive response calculation has to be performed only for the subsystem of interest. We show that this approach leads to very good results for the calculation of solvent-induced shifts of nuclear spin-spin coupling constants in hydrogen-bonded systems. Also for systems with stronger interactions, frozen-density embedding performs remarkably well, given the approximate nature of currently available functionals for the non-additive kinetic energy. As an example we show results for methylmercury halides which exhibit an exceptionally large shift of the one-bond coupling constants between {sup 199}Hg and {sup 13}C upon coordination of dimethylsulfoxide solvent molecules.

Götz, Andreas W., E-mail: agoetz@sdsc.edu [San Diego Supercomputer Center, University of California San Diego, 9500 Gilman Dr MC 0505, La Jolla, California 92093-0505 (United States); Autschbach, Jochen [Department of Chemistry, University at Buffalo, State University of New York, Buffalo, New York 14260-3000 (United States)] [Department of Chemistry, University at Buffalo, State University of New York, Buffalo, New York 14260-3000 (United States); Visscher, Lucas, E-mail: visscher@chem.vu.nl [Amsterdam Center for Multiscale Modeling (ACMM), VU University Amsterdam, Theoretical Chemistry, De Boelelaan 1083, 1081 HV Amsterdam (Netherlands)] [Amsterdam Center for Multiscale Modeling (ACMM), VU University Amsterdam, Theoretical Chemistry, De Boelelaan 1083, 1081 HV Amsterdam (Netherlands)

2014-03-14T23:59:59.000Z

404

Aerodynamic flail for a spinning projectile  

DOE Patents [OSTI]

A flail is provided which reduces the spin of a projectile in a recovery system which includes a parachute, a cable connected to the parachute, a swivel, and means for connecting the swivel to the projectile. The flail includes a plurality of flexible filaments and a rotor for attaching the filaments to the front end of the projectile. The rotor is located radially with respect to the spinning axis of the projectile. In one embodiment, the projectile includes a first nose cone section housing a deployable spin damping assembly; a second nose cone section, housing a deployable parachute assembly; a shell section, supporting the first and second nose cone sections during flight of the projectile; a mechanism for releasing the first nose cone section from the second cone section; and a mechanism for releasing the second nose cone section from the shell section. In operation of this embodiment, the deployable spin damping assembly deploys during flight of the projectile when the mechanism for releasing the first nose cone section from the second nose cone section are actuated. Then, upon actuation of the mechanism for releasing the second nose cone section from the shell section, two things happen: the spin damping assembly separates from the projectile; and the deployable parachute assembly is deployed.

Cole, James K. (Albuquerque, NM)

1990-01-01T23:59:59.000Z

405

Optimal control of the signal-to-noise ratio per unit time for a spin-1/2 particle  

Science Journals Connector (OSTI)

We investigate the maximum signal-to-noise ratio per unit time that can be achieved for a spin-1/2 particle subjected to a periodic pulse sequence. Optimal control techniques are applied to design the control field and the position of the steady state, leading to the best signal-to-noise performance. A complete geometric description of the optimal control problem is given in the unbounded case. We show the optimality of the well-known Ernst angle solution, which is widely used in spectroscopic and medical imaging applications, over a large control space allowing the use of shaped pulses.

M. Lapert; E. Assémat; S. J. Glaser; D. Sugny

2014-08-12T23:59:59.000Z

406

Transverse and longitudinal polarized-neutron, polarized-93Nb scattering, and the tensor spin-spin potential  

Science Journals Connector (OSTI)

Spin-spin cross sections were measured for 7.5-MeV polarized neutrons incident on cryogenically polarized Nb93. Measurements were made with spin orientations transverse and longitudinal to the beam direction, yielding ?Tss=-5.2±5.3 mb and ?Lss=-2.2±6.9 mb, respectively. The results are consistent with recent valence-nucleon folding model calculations. The tensor spin-spin potential is found to be small, V12=-67±190 keV. Volume integrals of spin-spin potentials are derived from depolarization and transmission experiments on C13, N15, Al27, and Nb93. The results for the central spin-spin potential are shown to be consistent with the folding model predictions.

J. P. Soderstrum; C. R. Gould; D. G. Haase; N. R. Roberson; M. B. Schneider; L. W. Seagondollar

1992-01-01T23:59:59.000Z

407

Spin diffusion at finite electric and magnetic fields  

Science Journals Connector (OSTI)

Spin-transport properties at finite electric and magnetic fields are studied by using the generalized semiclassical Boltzmann equation. It is found that the spin-diffusion equation for nonequilibrium spin density and spin currents involves a number of length scales that explicitly depend on the electric and magnetic fields. The set of macroscopic equations can be used to address a broad range of the spin-transport problems in magnetic multilayers as well as in semiconductor heterostructure. A specific example of spin injection into semiconductors at arbitrary electric and magnetic fields is illustrated.

Y. Qi and S. Zhang

2003-02-27T23:59:59.000Z

408

Electron spin magnetism of zigzag graphene nanoribbon edge states  

SciTech Connect (OSTI)

The electron spin states of zigzag graphene nanoribbon (ZGNR) edge play a pivotal role in the applications of graphene nanoribbons. However, the exact arrangements of the electron spins remain unclear to date. In this report, the electronic spin states of the ZGNR edge have been elucidated through a combination of quantum chemical investigation and previous electron spin resonance experiment observations. An alternating ? and ? spin configuration of the unpaired electrons along the ZGNR edge is established in ambient condition without any external magnetic field, and the origin of the spin magnetism of the ZGNR edge is revealed. It paves a pathway for the understanding and design of graphene based electronic and spintronic devices.

Xu, Kun, E-mail: xu83@purdue.edu; Ye, Peide D. [School of Electrical and Computer Engineering and Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907 (United States)

2014-04-21T23:59:59.000Z

409

NA Standards | Valence Geometries | Bond Lengths & Angles - Adenine  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Adenine Adenine ---------------------------------------------------- Bond or Angle Mean (esd, N) Value ---------------------------------------------------- N1-C2 1.339 (0.009, 48) C2-N3 1.331 (0.009, 48) N3-C4 1.344 (0.006, 48) C4-C5 1.383 (0.007, 48) C5-C6 1.406 (0.009, 48) C6-N1 1.351 (0.007, 48) C5-N7 1.388 (0.006, 48) N7-C8 1.311 (0.007, 48) C8-N9 1.373 (0.008, 48) N9-C4 1.374 (0.006, 48) C6-N6 1.335 (0.008, 48) N9-C1' 1.462 (0.010, 48) C6-N1-C2 118.6 (0.6, 48) N1-C2-N3 129.3 (0.5, 48) C2-N3-C4 110.6 (0.5, 48) N3-C4-C5 126.8 (0.7, 48) C4-C5-C6 117.0 (0.5, 48) C5-C6-N1 117.7 (0.5, 48) C4-C5-N7 110.7 (0.5, 48) C5-N7-C8 103.9 (0.5, 48)

410

NA Standards | Valence Geometries | Bond Lengths & Angles - Protonated  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Protonated Adenine Protonated Adenine ---------------------------------------------------- Bond or Angle Mean (esd, N) Value ---------------------------------------------------- N1-C2 1.357 (0.009, 15) C2-N3 1.305 (0.008, 15) N3-C4 1.356 (0.006, 15) C4-C5 1.378 (0.008, 15) C5-C6 1.403 (0.007, 15) C6-N1 1.359 (0.007, 15) C5-N7 1.379 (0.005, 15) N7-C8 1.312 (0.008, 15) C8-N9 1.373 (0.009, 15) N9-C4 1.365 (0.007, 15) C6-N6 1.320 (0.008, 15) N9-C1' 1.466 (0.009, 15) C6-N1-C2 123.3 (0.6, 15) N1-C2-N3 125.7 (0.6, 15) C2-N3-C4 111.6 (0.4, 15) N3-C4-C5 127.4 (0.6, 15) C4-C5-C6 117.9 (0.5, 15) C5-C6-N1 114.0 (0.4, 15) C4-C5-N7 111.0 (0.3, 15) C5-N7-C8 103.7 (0.4, 15)

411

NA Standards | Valence Geometries | Bond Lengths & Angles - Guanine  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Guanine Guanine ---------------------------------------------------- Bond or Angle Mean (esd, N) Value ---------------------------------------------------- N1-C2 1.373 (0.008, 21) C2-N3 1.323 (0.008, 21) N3-C4 1.350 (0.007, 21) C4-C5 1.379 (0.007, 21) C5-C6 1.419 (0.010, 21) C6-N1 1.391 (0.007, 21) C5-N7 1.388 (0.006, 21) N7-C8 1.305 (0.006, 21) C8-N9 1.374 (0.007, 21) N9-C4 1.375 (0.008, 21) C2-N2 1.341 (0.010, 21) C6-O6 1.237 (0.009, 21) N9-C1' 1.459 (0.009, 21) C6-N1-C2 125.1 (0.6, 21) N1-C2-N3 123.9 (0.6, 21) C2-N3-C4 111.9 (0.5, 21) N3-C4-C5 128.6 (0.5, 21) C4-C5-C6 118.8 (0.6, 21) C5-C6-N1 111.5 (0.5, 21)

412

Angle stations in or for endless conveyor belts  

DOE Patents [OSTI]

In an angle station for an endless conveyor belt, there are presented to each incoming run of the belt stationary curved guide members (18, 19) of the shape of a major segment of a right-circular cylinder and having in the part-cylindrical portion (16 or 17) thereof rectangular openings (15) arranged in parallel and helical paths and through which project small freely-rotatable rollers (14), the continuously-changing segments of the curved surfaces of which projecting through said openings (15) are in attitude to change the direction of travel of the belt (13) through 90.degree. during passage of the belt about the part-cylindrical portion (16 or 17) of the guide member (18 or 19). The rectangular openings (15) are arranged with their longer edges lengthwise of the diagonals representing the mean of the helix but with those of a plurality of the rows nearest to each end of the part-cylindrical portion (16 or 17) slightly out of axial symmetry with said diagonals, being slightly inclined in a direction about the intersections (40) of the diagonals of the main portion of the openings, to provide a "toe-in" attitude in relation to the line of run of the endless conveyor belt.

Steel, Alan (Glasgow, GB6)

1987-04-07T23:59:59.000Z

413

Ultrasonic estimation of the contact angle of a sessile droplet  

SciTech Connect (OSTI)

Radiation of energy by large amplitude leaky Rayleigh waves is regarded as one of the key physical mechanisms regulating the actuation and manipulation of droplets in surface acoustic wave (SAW) microfluidic devices. The interaction between a SAW and a droplet is highly complex and is presently the subject of extensive research. This paper investigates the existence of an additional interaction mechanism based on the propagation of quasi-Stoneley waves inside sessile droplets deposited on a solid substrate. In contrast with the leaky Rayleigh wave, the energy of the Stoneley wave is confined within a thin fluid layer in contact with the substrate. The hypothesis is confirmed by three-dimensional finite element simulations and ultrasonic scattering experiments measuring the reflection of Rayleigh waves from droplets of different diameters. Moreover, real-time monitoring of the droplet evaporation process reveals a clear correlation between the droplet contact angle and the spectral information of the reflected Rayleigh signal, thus paving the way for ultrasonic measurements of surface tension.

Quintero, R.; Simonetti, F. [Department of Aerospace Engineering and Engineering Mechanics, University of Cincinnati, Cincinnati, OH 45221 (United States)

2014-02-18T23:59:59.000Z

414

Radiation Dry Bias in the TWP-ICE Radiosonde Soundings Solar Zenith Angle Correction Factor  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Radiation Dry Bias in the TWP-ICE Radiosonde Soundings Radiation Dry Bias in the TWP-ICE Radiosonde Soundings Solar Zenith Angle Correction Factor Figure 3: Ratio of MWR TCWV to radiosonde derived TCWV, and the solar zenith angle at the radiosonde launch time (black dots). The dry bias observed in sonde TCWV values is mainly attributable to a dry RH bias near the surface The red dots show the 1000 hPa RH correction factors suggested by Voemel et al for sondes launched near noon (10-30 degree solar zenith angle), and at night time (90 degree zenith angle). The green line shows a modified RH correction factor which is a function of the solar zenith angle. ● During the day-time, the TCWV bias is significantly smaller when the zenith angle correction is applied than when no correction, or only the Crad and Ccal corrections are applied.

415

Development of a hybrid margin angle controller for HVDC continuous operation  

SciTech Connect (OSTI)

The objective of this paper is to present a new hybrid margin angle control method for HVDC continuous operation under AC system fault conditions. For stable continuous operation of HVDC systems, the margin angle controller must be designed to maintain the necessary margin angle to avoid commutation failures. The proposed method uses the open loop margin angle controller (MAC) as the basic controller, and adds output from the closed loop MAC to correct the control angle. A fast voltage detection algorithm is used for open loop control, and margin angle reference correction using harmonics detection for closed loop control are also developed. The combination of open and closed loop control provides quick responses when faults occur with stable and speedy recovery after fault clearance. The effectiveness of the developed controller is confirmed through EMTP digital simulations and also with the experiments using an analogue simulator.

Sato, M. [Kansai Electric Power Co., Osaka (Japan)] [Kansai Electric Power Co., Osaka (Japan); Yamaji, K. [Shikoku Electric Power Co., Takamatsu (Japan)] [Shikoku Electric Power Co., Takamatsu (Japan); Sekita, M. [Electric Power Development Co., Tokyo (Japan)] [Electric Power Development Co., Tokyo (Japan); Amano, M.; Nishimura, M.; Konishi, H.; Oomori, T. [Hitachi, Ltd. (Japan)] [Hitachi, Ltd. (Japan)

1996-11-01T23:59:59.000Z

416

Definition: Operating Reserve - Spinning | Open Energy Information  

Open Energy Info (EERE)

Reserve - Spinning Reserve - Spinning Jump to: navigation, search Dictionary.png Operating Reserve - Spinning The portion of Operating Reserve consisting of: Generation synchronized to the system and fully available to serve load within the Disturbance Recovery Period following the contingency event; or, Load fully removable from the system within the Disturbance Recovery Period following the contingency event.[1] View on Wikipedia Wikipedia Definition In electricity networks, the operating reserve is the generating capacity available to the system operator within a short interval of time to meet demand in case a generator goes down or there is another disruption to the supply. Most power systems are designed so that, under normal conditions, the operating reserve is always at least the capacity of the

417

Spinning with the Sun | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Spinning with the Sun Spinning with the Sun Spinning with the Sun April 4, 2013 - 3:31pm Addthis Patrick Yarn Mills, located in Kings Mountain North Carolina, installed a 105-kilowatt rooftop solar system with the help of the Energy Department's State Energy Program. | Photo courtesy of the NC Energy Office. Patrick Yarn Mills, located in Kings Mountain North Carolina, installed a 105-kilowatt rooftop solar system with the help of the Energy Department's State Energy Program. | Photo courtesy of the NC Energy Office. Julie McAlpin Communications Liaison, State Energy Program What does this project do? Patrick Yarn Mills installed a 105-kilowatt rooftop solar array that produces enough energy to power 14 homes. Since the array was installed more than two years ago, it has generated enough energy to power 1,732 6-watt lightbulbs for eight hours a

418

Observation of propagating edge spin waves modes  

SciTech Connect (OSTI)

Broadband magnetization response of equilateral triangular 1000 nm Permalloy dots has been studied under an in-plane magnetic field, applied parallel (buckle state), and perpendicular (Y state) to the triangles base. Micromagnetic simulations identify edge spin waves (E-SWs) in the buckle state as SWs propagating along the two adjacent edges. These quasi one-dimensional spin waves emitted by the vertex magnetic charges gradually transform from propagating to standing due to interference and are weakly affected by dipolar interdot interaction and variation of the aspect ratio. Spin waves in the Y state have a two dimensional character. These findings open perspectives for implementation of the E-SWs in magnonic crystals and thin films.

Lara, A.; Aliev, F. G., E-mail: farkhad.aliev@uam.es [Dpto. Física de la Materia Condensada C-III, Instituto Nicolas Cabrera (INC) and Condensed Matter Physics Institute (IFIMAC), Universidad Autónoma de Madrid, Madrid 28049 (Spain); Metlushko, V. [Department of Electrical and Computer Engineering, University of Illinois, Chicago, Illinois 60607 (United States)

2013-12-07T23:59:59.000Z

419

Decoherence of spin-deformed bosonic model  

SciTech Connect (OSTI)

The decoherence rate and some parameters affecting it are investigated for the generalized spin-boson model. We consider the spin-bosonic model when the bosonic environment is modeled by the deformed harmonic oscillators. We show that the state of the environment approaches a non-linear coherent state. Then, we obtain the decoherence rate of a two-level system which is in contact with a deformed bosonic environment which is either in thermal equilibrium or in the ground state. By using some recent realization of f-deformed oscillators, we show that some physical parameters strongly affect the decoherence rate of a two-level system. -- Highlights: •Decoherence of the generalized spin-boson model is considered. •In this model the environment consists of f-oscillators. •Via the interaction, the state of the environment approaches non-linear coherent states. •Effective parameters on decoherence are considered.

Dehdashti, Sh., E-mail: shahram.dehdashti@gmail.com [Department of Physics, Faculty of Science, University of Isfahan, Hezar Jerib St., Isfahan 81746-73441 (Iran, Islamic Republic of); Mahdifar, A., E-mail: mahdifar_a@sci.sku.ac.ir [Science Department, Shahrekord University, Shahrekord (Iran, Islamic Republic of); Bagheri Harouni, M., E-mail: m-bagheri@phys.ui.ac.ir [Department of Physics, Faculty of Science, University of Isfahan, Hezar Jerib St., Isfahan 81746-73441 (Iran, Islamic Republic of); Quantum Optics Group, Department of Physics, Faculty of Science, University of Isfahan, HezarJerib St., Isfahan 81746-73441 (Iran, Islamic Republic of); Roknizadeh, R., E-mail: rokni@sci.ui.ac.ir [Department of Physics, Faculty of Science, University of Isfahan, Hezar Jerib St., Isfahan 81746-73441 (Iran, Islamic Republic of); Quantum Optics Group, Department of Physics, Faculty of Science, University of Isfahan, HezarJerib St., Isfahan 81746-73441 (Iran, Islamic Republic of)

2013-07-15T23:59:59.000Z

420

Spin entanglement, decoherence and Bohm's EPR paradox  

E-Print Network [OSTI]

We obtain criteria for entanglement and the EPR paradox for spin-entangled particles and analyse the effects of decoherence caused by absorption and state purity errors. For a two qubit photonic state, entanglement can occur for all transmission efficiencies. In this case, the state preparation purity must be above a threshold value. However, Bohm's spin EPR paradox can be achieved only above a critical level of loss. We calculate a required efficiency of 58%, which appears achievable with current quantum optical technologies. For a macroscopic number of particles prepared in a correlated state, spin entanglement and the EPR paradox can be demonstrated using our criteria for efficiencies {\\eta} > 1/3 and {\\eta} > 2/3 respectively. This indicates a surprising insensitivity to loss decoherence, in a macroscopic system of ultra-cold atoms or photons.

E. G. Cavalcanti; P. D. Drummond; H. A. Bachor; M. D. Reid

2007-11-23T23:59:59.000Z

Note: This page contains sample records for the topic "magic angle spinning" 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

Magellan Tackles the Mysterious Proton Spin  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Magellan Tackles Magellan Tackles Mysterious Proton Spin Magellan Tackles Mysterious Proton Spin July 28, 2011 | Tags: Accelerator Science, Data Transfer, ESnet, Magellan Linda Vu, lvu@lbl.gov, +1 510 495 2402 The STAR experiment's detector records the decay of subatomic smash-ups to uncover how the fundamental building blocks of the universe work. What makes a proton spin? That is one of the biggest mysteries in physics. Although researchers do not fully understand the underlying physics of this phenomenon, they do know that it contributes to the stability of the universe, magnetic interactions, and are a vital component of technologies like Magnetic Resonance Imaging (MRI) machines that are used in hospitals around the globe. To solve this mystery, researchers are smashing together polarized proton

422

Raman-dressed spin-1 spin-orbit-coupled quantum gas  

Science Journals Connector (OSTI)

The recently realized spin-orbit-coupled quantum gases [Lin et al., Nature (London) 471, 83 (2011); Wang et al., Phys. Rev. Lett. 109, 095301 (2012); Cheuk et al., Phys. Rev. Lett. 109, 095302 (2012)] mark a breakthrough in the cold atom community. In these experiments, two hyperfine states are selected from a hyperfine manifold to mimic a pseudospin-1/2 spin-orbit-coupled system by the method of Raman dressing, which is applicable to both bosonic and fermionic gases. In this paper, we show that the method used in these experiments can be generalized to create any large pseudospin spin-orbit-coupled gas if more hyperfine states are coupled equally by the Raman lasers. As an example, we study, in detail, a quantum gas with three hyperfine states coupled by the Raman lasers and show, when the state-dependent energy shifts of the three states are comparable, triple-degenerate minima will appear at the bottom of the band dispersions, thus, realizing a spin-1 spin-orbit-coupled quantum gas. A novel feature of this three-minima regime is that there can be two different kinds of stripe phases with different wavelengths, which has an interesting connection to the ferromagnetic and polar phases of spin-1 spinor Bose-Einstein condensates without spin-orbit coupling.

Zhihao Lan and Patrik Öhberg

2014-02-24T23:59:59.000Z

423

The behavior of the pitch angle of spiral arms depending on optical wavelength  

E-Print Network [OSTI]

Based on integral field spectroscopy data from the CALIFA survey, we investigate the possible dependence of spiral arm pitch angle with optical wavelength. For three of the five studied objects, the pitch angle gradually increases at longer wavelengths. This is not the case for two objects where the pitch angle remains constant. This result is confirmed by the analysis of SDSS data. We discuss the possible physical mechanisms to explain this phenomenon, as well as the implications of the results.

Martínez-García, Eric E; Rosales-Ortega, F F; González-Lópezlira, Rosa A; Fuentes-Carrera, Isaura; Luna, A

2014-01-01T23:59:59.000Z

424

Hall viscosity, spin density, and torsion  

E-Print Network [OSTI]

We investigate the relationship between Hall viscosity, spin density and response to geometric torsion. For the most general effective action for relativistic gapped systems, the presence of non-universal terms implies that there is no relationship between torsion response and Hall viscosity. We also consider free relativistic and non-relativistic microscopic actions and again verify the existence of analogous non-universal couplings. Explicit examples demonstrate that torsion response is unrelated to both Hall viscosity and spin density. We also argue that relativistic gapped theories must have vanishing Hall viscosity in Lorentz invariant vacuums.

Geracie, Michael; Roberts, Matthew M

2014-01-01T23:59:59.000Z

425

Pseudo-Spin Symmetry and its Applications  

E-Print Network [OSTI]

The pseudo-spin symmetry is reviewed. A mapping that produces the separation of the total angular momentum into pseudo-orbital and pseudo-spin degrees of freedom is discussed, together with the analytic transformations that take us from the normal parity space to the eigenstates of a pseudo-oscillator with one quanta less. The many-particle version of the unitary transformation to the pseudo-SU(3) space is established. As an example, these symmetries are used to describe the double beta decay phenomenon in heavy deformed nuclei.

Octavio Casta~nos; Jorge G. Hirsch; Peter O. Hess. To be published in Proc. CAM94 Phys. Meeting; AIP Press

1995-01-26T23:59:59.000Z

426

Functional Keldysh theory of spin torques  

E-Print Network [OSTI]

Functional Keldysh theory of spin torques R. A. Duine,1,* A. S. N??ez, 2,? Jairo Sinova,3,? and A. H. MacDonald4,? 1Institute for Theoretical Physics, Utrecht University, Leuvenlaan 4, 3584 CE Utrecht, The Netherlands 2Instituto de F?sica, PUCV...Functional Keldysh theory of spin torques R. A. Duine,1,* A. S. N??ez, 2,? Jairo Sinova,3,? and A. H. MacDonald4,? 1Institute for Theoretical Physics, Utrecht University, Leuvenlaan 4, 3584 CE Utrecht, The Netherlands 2Instituto de F?sica, PUCV...

Duine, R. A.; Nunez, A. S.; Sinova, Jairo; MacDonald, A. H.

2007-01-01T23:59:59.000Z

427

Freezing distributed entanglement in spin chains  

Science Journals Connector (OSTI)

We show how to freeze distributed entanglement that has been created from the natural dynamics of spin chain systems. The technique that we propose simply requires single-qubit operations and isolates the entanglement in specific qubits at the ends of branches. Such frozen entanglement provides a useful resource, for example for teleportation or distributed quantum processing. The scheme can be applied to a wide range of systems—including actual spin systems and alternative qubit embodiments in strings of quantum dots, molecules, or atoms.

Irene D’Amico; Brendon W. Lovett; Timothy P. Spiller

2007-09-12T23:59:59.000Z

428

Neutron single target spin asymmetries in SIDIS  

SciTech Connect (OSTI)

The experiment E06-010 in Hall A at Jefferson Lab took data between November 2008 and February 2009 to directly measure, for the first time, the pion (and kaon) single "neutron" target-spin asymmetry (SSA) in semi-inclusive DIS from a polarized 3He target. Collins, Sivers (and Pretzelosity) neutron asymmetries are going to be extracted from the measured SSA. Details of the experiment are described together with the preliminary results of the ongoing analysis. Near future Hall A experiments on transverse nucleon spin structure are shorty reviewed.

Evaristo Cisbani

2010-04-01T23:59:59.000Z

429

E-Print Network 3.0 - angle particle-particle correlation Sample...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

angle has been ... Source: Khandekar, Sameer - Department of Mechanical Engineering, Indian Institute of Technology Kanpur Collection: Engineering 13 JOURNAL DE PHYSIQUE...

430

E-Print Network 3.0 - angled-resolved photoelectron spectroscopy...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

state was visible by angle-resolved valence band photoelectron spectroscopy, and that the LEED... -dependence of the ... Source: Ortega, Enrique - Donostia International Physics...

431

E-Print Network 3.0 - angle hysteresis effects Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

to be multiple-valued rather than single-valued functions of the angle of attack. Aerodynamic hysteresis... study to predict the aerodynamic hysteresis near the static stall...

432

E-Print Network 3.0 - angle-correlated spectrum measurement Sample...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

distance and vs zenith angle, correlation... will be of main significance for: a) the verification and extension of the CR anisotropy measurement reported... ) the measurement...

433

The optimum tilt angle for flat-plate solar collectors in Iran  

Science Journals Connector (OSTI)

This paper aims at determining the optimum tilt angle for south facing flat-plate solar collectors in Iran. Solar radiation on a horizontal surface was estimated by applying an empirical method and employing meteorological data from 80 selected cities. A mathematical model was used for estimating the solar radiation at different tilt angles. Daily monthly seasonally bi-annually and yearly optimum tilt angles and solar radiations were determined for 80 selected cities. Recommendations were made on the optimum tilt angle adjustment for different places in the country in order to benefit the best solar radiation available. The averaged benefits of annual solar radiation for 80 cities were 21.3% for daily 21% for monthly 19.6% for seasonal 19.3% for bi-annual and 13.3% for yearly adjustments compared with the radiation on the horizontal collector. Based on these results adjusting tilt angles at least twice a year is recommended. Optimum tilt angles for cloudy sky cities with a low clearness index are lower than those for cities at the same latitude angle having a higher clearness index. In addition to latitude angle the climate conditions are also important for determining the optimum tilt angle.

Farzad Jafarkazemi; S. Ali Saadabadi; Hadi Pasdarshahri

2012-01-01T23:59:59.000Z

434

Latitude Based Model for Tilt Angle Optimization for Solar Collectors in the Mediterranean Region  

Science Journals Connector (OSTI)

Abstract This paper inspects the different parameters that intervene in the determination of the optimal tilt angle for maximum solar energy collection. It proposes a method for calculating the optimal tilt angle based upon the values of the daily global solar radiation on a horizontal surface. A computer program using the mathematical model to calculate the solar radiation incident on an inclined surface as a function of the tilt angle is implemented. Four years data of daily global solar radiation on a horizontal surface in 35 sites in different countries of the Mediterranean region is used. The program assumes a due south orientation of the collectors and it determines the optimal tilt angle for maximum solar radiation collection for sites in the Mediterranean region. A regression analysis using the results of the computer simulation is conducted to develop a latitude based tilt angle optimization mathematical model for maximum solar radiation collection for the sites. We tested both a linear and a quadratic model (of the form ax2+bx) for representing the relationship between the annual optimal tilt angle and the site's latitude. The quadratic model is better; it provides very high prediction accuracy. 99.87% of the variation in the annual optimal tilt angle is explained by the variability in site's latitude with an average residual angle of only 0.96° for all 35 sites studied. It also gives an average percentage decrease in the annual solar radiation of only 0.016% when compared with actual optimal tilt angles.

Hassane Darhmaoui; Driss Lahjouji

2013-01-01T23:59:59.000Z

435

Emission-angle-dependent photoluminescence of rubrene thin films on silver  

Science Journals Connector (OSTI)

Rubrene layers with thickness comparable to a visible light wavelength on silver thin film exhibit anomalous photoluminescence (PL) spectra that depend strongly on emission angle. The...

Wakamatsu, Takashi

2014-01-01T23:59:59.000Z

436

E-Print Network 3.0 - angle results suggest Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

blood SNR (red), blood-myocardium CNR Summary: and image analysis was performed in Matlab. Results and Discussion: The flip angle in SSFP is a critical... . Simulations suggest...

437

E-Print Network 3.0 - angle elastic scattering Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Force Academy, University of New South Wales Collection: Physics ; Materials Science 2 Neutron Scattering in Polymer Micelle Characterization Summary: is changed 12;Small Angle...

438

E-Print Network 3.0 - angle neutron diffractometer Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

(300 - 2000 K) X-ray reflectometer (under installation) Small and Ultra Small Angle Neutron Scattering... (at)ipta.demokritos.gr 2106503712 2106533431 Large Scale...

439

E-Print Network 3.0 - angle diffractometer sans Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

< 1 2 3 4 5 > >> 1 Technical ParametersSNS Primary Parameters Summary: -Range Small-Angle Neutron Scattering Diffractometer (EQ-SANS) 7 BD Water Engineering Materials...

440

E-Print Network 3.0 - angle neutron scattering Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

neutron scattering Search Powered by Explorit Topic List Advanced Search Sample search results for: angle neutron scattering Page: << < 1 2 3 4 5 > >> 1 Exceptional tools for...

Note: This page contains sample records for the topic "magic angle spinning" 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

E-Print Network 3.0 - angle-resolved photoemission extended Sample...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

photoemission evidence for a Gd(0001) surface state Dongqi Lia, C.W. Hutchings... April 1991. Available online 31 July 2002. Abstract From angle resolved photoemission we have...

442

Regge trajectory of the ? (J) particles and pp elastic scattering at large angles  

Science Journals Connector (OSTI)

It is shown that the proton-proton elastic scattering data at large angles can be described by a trajectory with the same shape as the ? (J) trajectory.

M. Arik; D. D. Coon; S. Yu

1976-02-01T23:59:59.000Z

443

E-Print Network 3.0 - angle spectroscopic ellipsometry Sample...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

spectroscopic ellipsometer, the sub-wavelength periodic structure can provide a broad... C samples are then characterized by using a spectrophotometer and an angle-...

444

E-Print Network 3.0 - angle tracking procedure Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

peculiarities... affect- ing the track appearances is the total internal reflection and inclination angles of elements... tracing method in studying tracks in SSNTDs D....

445

E-Print Network 3.0 - angle scattering revision Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

and scattering, effective index, surface autocovariance, and correlation... . The phenomenology is complex, including specular and diffuse reflection, high-angle forward...

446

Geothermal: Sponsored by OSTI -- The Role of Low-Angle Extensional...  

Office of Scientific and Technical Information (OSTI)

Role of Low-Angle Extensional Tectonics, Flat Fracture Domains, and Gravity Slides in Hydrothermal and EGS Resources of the Western United States Geothermal Technologies Legacy...

447

E-Print Network 3.0 - angle of attack Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

and Information Sciences 58 NAVIERSTOKES ANALYSIS OF SUBSONIC FLOWFIELDS OVER A MISSILE CONFIGURATION Summary: configuration are computed at high angles of attack ranging...

448

Spin-transfer switching of orthogonal spin-valve devices at cryogenic temperatures  

SciTech Connect (OSTI)

We present the quasi-static and dynamic switching characteristics of orthogonal spin-transfer devices incorporating an out-of-plane magnetized polarizing layer and an in-plane magnetized spin valve device at cryogenic temperatures. Switching at 12?K between parallel and anti-parallel spin-valve states is investigated for slowly varied current as well as for current pulses with durations as short as 200 ps. We demonstrate 100% switching probability with current pulses 0.6?ns in duration. We also present a switching probability diagram that summarizes device switching operation under a variety of pulse durations, amplitudes, and polarities.

Ye, L., E-mail: ly17@nyu.edu; Gopman, D. B.; Rehm, L.; Backes, D.; Wolf, G.; Kent, A. D. [Department of Physics, New York University, New York, New York 10003 (United States); Ohki, T. [Raytheon BBN Technologies, Cambridge, Massachusetts 02138 (United States); Kirichenko, A. F.; Vernik, I. V.; Mukhanov, O. A. [HYPRES, 175 Clearbrook Road, Elmsford, New York 10523 (United States)

2014-05-07T23:59:59.000Z

449

Spin-Hamilton Operator, Graviton-Photon Coupling and an Eigenvalue Problem  

E-Print Network [OSTI]

We solve exactly the eigenvalue problem for a spin Hamilton operator describing graviton-photon coupling. Entanglement of the eigenstates are also studied. Other spin-coupled Hamilton operators involving spin-1 and spin-2 are also investigated and compared.

Yorick Hardy; Willi-Hans Steeb

2012-09-28T23:59:59.000Z

450

NA Standards | Valence Geometries | Bond Lengths & Angles - Thymine  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Thymine Thymine ---------------------------------------------------- Bond or Angle Mean (esd, N) Value ---------------------------------------------------- N1-C2 1.376 (0.008, 50) C2-N3 1.373 (0.008, 50) N3-C4 1.382 (0.008, 50) C4-C5 1.445 (0.009, 50) C5-C6 1.339 (0.007, 50) C6-N1 1.378 (0.007, 50) C2-O2 1.220 (0.008, 50) C4-O4 1.228 (0.009, 50) C5-M5 1.496 (0.006, 50) N1-C1' 1.473 (0.014, 50) C6-N1-C2 121.3 (0.5, 50) N1-C2-N3 114.6 (0.6, 50) C2-N3-C4 127.2 (0.6, 50) N3-C4-C5 115.2 (0.6, 50) C4-C5-C6 118.0 (0.6, 50) C5-C6-N1 123.7 (0.6, 50) N1-C2-O2 123.1 (0.8, 50) N3-C2-O2 122.3 (0.6, 50) N3-C4-O4 119.9 (0.6, 50) C5-C4-O4 124.9 (0.7, 50) C4-C5-M5 119.0 (0.6, 50)

451

NA Standards | Valence Geometries | Bond Lengths & Angles - Protonated  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Protonated Cytosine Protonated Cytosine ---------------------------------------------------- Bond or Angle Mean (esd, N) Value ---------------------------------------------------- N1-C2 1.381 (0.007, 17) C2-N3 1.384 (0.007, 17) N3-C4 1.353 (0.006, 17) C4-C5 1.413 (0.005, 17) C5-C6 1.346 (0.006, 17) C6-N1 1.365 (0.007, 17) C2-O2 1.212 (0.006, 17) C4-N4 1.315 (0.007, 17) N1-C1' 1.483 (0.015, 17) C6-N1-C2 121.7 (0.5, 17) N1-C2-N3 114.7 (0.7, 17) C2-N3-C4 125.3 (0.7, 17) N3-C4-C5 117.6 (0.5, 17) C4-C5-C6 118.4 (0.5, 17) C5-C6-N1 122.2 (0.5, 17) N1-C2-O2 123.4 (0.7, 17) N3-C2-O2 121.9 (0.5, 17) N3-C4-N4 119.5 (0.7, 17) C5-C4-N4 123.0 (0.8, 17) C6-N1-C1' 121.2 (0.9, 17) C2-N1-C1' 116.9 (1.0, 17

452

NA Standards | Valence Geometries | Bond Lengths & Angles - Uracil  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Uracil Uracil ---------------------------------------------------- Bond or Angle Mean (esd, N) Value ---------------------------------------------------- N1-C2 1.381 (0.009, 46) C2-N3 1.373 (0.007, 46) N3-C4 1.380 (0.009, 46) C4-C5 1.431 (0.009, 46) C5-C6 1.337 (0.009, 46) C6-N1 1.375 (0.009, 46) C2-O2 1.219 (0.009, 46) C4-O4 1.232 (0.008, 46) N1-C1' 1.469 (0.014, 46) C6-N1-C2 121.0 (0.6, 46) N1-C2-N3 114.9 (0.6, 46) C2-N3-C4 127.0 (0.6, 46) N3-C4-C5 114.6 (0.6, 46) C4-C5-C6 119.7 (0.6, 46) C5-C6-N1 122.7 (0.5, 46) N1-C2-O2 122.8 (0.7, 46) N3-C2-O2 122.2 (0.7, 46) N3-C4-O4 119.4 (0.7, 46) C5-C4-O4 125.9 (0.6, 46) C6-N1-C1' 121.2 (1.4, 46) C2-N1-C1' 117.7 (1.2, 46

453

Spin-geodesic deviations in the Schwarzschild spacetime  

E-Print Network [OSTI]

The deviation of the path of a spinning particle from a circular geodesic in the Schwarzschild spacetime is studied by an extension of the idea of geodesic deviation. Within the Mathisson-Papapetrou-Dixon model and assuming the spin parameter to be sufficiently small so that it makes sense to linearize the equations of motion in the spin variables as well as in the geodesic deviation, the spin-curvature force adds an additional driving term to the second order system of linear ordinary differential equations satisfied by nearby geodesics. Choosing initial conditions for geodesic motion leads to solutions for which the deviations are entirely due to the spin-curvature force, and one finds that the spinning particle position for a given fixed total spin oscillates roughly within an ellipse in the plane perpendicular to the motion, while the azimuthal motion undergoes similar oscillations plus an additional secular drift which varies with spin orientation.

Donato Bini; Andrea Geralico; Robert T. Jantzen

2014-08-21T23:59:59.000Z

454

Model Checking Networks of Telecommunications Services using SPIN  

E-Print Network [OSTI]

Model Checking Networks of Telecommunications Services using SPIN Mu y Calder and Alice Miller Department of Computing Science University of Glasgow Glasgow, Scotland. Abstract A basic telecommunications. keywords telecommunications services;Promela/Spin;communicating processes; distributed systems; formal

Miller, Alice

455

Joule heating generated by spin current through Josephson junctions  

SciTech Connect (OSTI)

We theoretically study the spin-polarized current flowing through a Josephson junction (JJ) in a spin injection device. When the spin-polarized current is injected from a ferromagnet in a superconductor (SC), the charge current is carried by the superconducting condensate (Cooper pairs), while the spin-up and spin-down currents flow in equal magnitude but in the opposite direction in a SC, because of no quasiparticle charge current in the SC. This indicates that not only the Josephson current but also the spin current flow across JJ at zero bias voltage, thereby generating Joule heating by the spin current. The result provides a new method for detecting the spin current by measuring Joule heating at JJ. {copyright} 2001 American Institute of Physics.

Takahashi, S.; Yamashita, T.; Koyama, T.; Maekawa, S.; Imamura, H.

2001-06-01T23:59:59.000Z

456

High Field Quantum Spin Hall State in Graphene  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

quantum spin Hall (QSH) state-the paradigmatic two dimensional SPT phase-in monolayer graphene. In a QSH state, electrons with opposite spin polarization carry current in opposite...

457

Nutation in the spinning SPHERES spacecraft and fluid slosh  

E-Print Network [OSTI]

Spacecraft today are often spin-stabilized during a portion their launch or mission. Though the basics of spin stabilization are well understood, there remains uncertainty in predicting the likelihood of rapid nutation ...

Burke, Caley Ann

2010-01-01T23:59:59.000Z

458

Topological Spin Texture in a Quantum Anomalous Hall Insulator  

E-Print Network [OSTI]

The quantum anomalous Hall (QAH) effect has been recently discovered in an experiment using a thin-film topological insulator with ferromagnetic ordering and strong spin-orbit coupling. Here we investigate the spin degree ...

Wu, Jiansheng

459

INSTITUT NEEL Grenoble International training network "Spin-Optronics"  

E-Print Network [OSTI]

INSTITUT NEEL Grenoble International training network "Spin-Optronics" EU funded PhD grant Injected carrier (back) #12;INSTITUT NEEL Grenoble International training network "Spin-Optronics" EU

van Tiggelen, Bart

460

Program Offers New Spin on Traditional Marketing | Department...  

Broader source: Energy.gov (indexed) [DOE]

Program Offers New Spin on Traditional Marketing Program Offers New Spin on Traditional Marketing A photo of several boys in matching T-shirts dancing on a paved surface....

Note: This page contains sample records for the topic "magic angle spinning" 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

Mechanism and assessment of spin transfer torque (STT) based memory  

E-Print Network [OSTI]

When a sufficient current density passes through the MTJ, the spin-polarized current will exert a spin transfer torque to switch the magnetization of the free layer. This is the fundamental of the novel write mechanism in ...

Loh, Iong Ying

2009-01-01T23:59:59.000Z

462

Ripples in a string coupled to Glauber spins  

E-Print Network [OSTI]

Each oscillator in a linear chain (a string) interacts with a local Ising spin in contact with a thermal bath. These spins evolve according to Glauber dynamics. Below a critical temperature, there appears an equilibrium, ...

Rosales, Rodolfo R.

463

ARM: Shortwave Array Spectroradiometer-Hemispheric, VISible channel, high-sun angles [a0 data is uncalibrated  

DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

Shortwave Array Spectroradiometer-Hemispheric, VISible channel, high-sun angles [a0 data is uncalibrated

Flynn, Connor

464

ARM: Shortwave Array Spectroradiometer-Hemispheric, VISible channel, low-sun angles [a0 data is uncalibrated  

DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

Shortwave Array Spectroradiometer-Hemispheric, VISible channel, low-sun angles [a0 data is uncalibrated

Flynn, Connor

465

ARM: Shortwave Array Spectroradiometer-Hemispheric, VISible channel, high-sun angles [a0 data is uncalibrated  

SciTech Connect (OSTI)

Shortwave Array Spectroradiometer-Hemispheric, VISible channel, high-sun angles [a0 data is uncalibrated

Connor Flynn

2011-03-22T23:59:59.000Z

466

ARM: Shortwave Array Spectroradiometer-Hemispheric, VISible channel, low-sun angles [a0 data is uncalibrated  

SciTech Connect (OSTI)

Shortwave Array Spectroradiometer-Hemispheric, VISible channel, low-sun angles [a0 data is uncalibrated

Connor Flynn

2011-03-22T23:59:59.000Z

467

Micro-Electron Spin Resonance for Airborne Soot Measurement  

Broader source: Energy.gov [DOE]

A real-time method for airborne soot concentration measurement using a miniaturized electron spin resonance sensor is presented.

468

condmat/9801215 Crossovers in the Two Dimensional Ising Spin Glass  

E-Print Network [OSTI]

cond­mat/9801215 v2 26 Jan 1998 Crossovers in the Two Dimensional Ising Spin Glass of extensive computer simulations we analyze in detail the two dimen­ sional \\SigmaJ Ising spin glass Introduction At present it is clear that the lower critical dimension of Edwards­Anderson Ising spin glasses

Roma "La Sapienza", Università di

469

MOTT INSULATORS, SPIN LIQUIDS AND QUANTUM DISORDERED SUPERCONDUCTIVITY  

E-Print Network [OSTI]

COURSE 7 MOTT INSULATORS, SPIN LIQUIDS AND QUANTUM DISORDERED SUPERCONDUCTIVITY MATTHEW P.A. FISHER insulators and quantum magnetism 583 3.1 Spin models and quantum magnetism . . . . . . . . . . . . . . . . . . . . . . . . . . . . 637 #12;MOTT INSULATORS, SPIN LIQUIDS AND QUANTUM DISORDERED SUPERCONDUCTIVITY Matthew P.A. Fisher

470

Muon-spin-rotation studies of organic magnets  

Science Journals Connector (OSTI)

...organized by P. Day and A. E. Underhill Muon-spin-rotation studies of organic magnets...Laboratory, Parks Road, Oxford OX1 3PU, UK A muon is an unstable spin- particle with a lifetime...s. Beams of spin-polarized positive muons can be prepared at accelerator facilities...

1999-01-01T23:59:59.000Z

471

DIFFUSION INELASTIQUE DES AIEUTRONS ET ONDES DE SPIN  

E-Print Network [OSTI]

measured in the three principal symmetry directions by neutron inelastic scattering.The spin wave of neutrons C(Eogo)scattered by a spin wave of energy Eo and wave vector qo satisfies the following diffusion inklastiquedes neutrons. On a trouvB que les relations de dispersion des ondes de spin

Boyer, Edmond

472

Extensibility, Safety and Performance in the SPIN Operating System  

E-Print Network [OSTI]

Extensibility, Safety and Performance in the SPIN Operating System Brian N. Bershad Stefan Savage the motivation, architecture and per- formance of SPIN, an extensible operating system. SPIN provides change the operating system's interface and implementation. Extensions allow an application to specialize

Savage, Stefan

473

Spin Wave Energies in the Band Theory of Ferromagnetism  

Science Journals Connector (OSTI)

...1967 research-article Spin Wave Energies in the Band Theory of Ferromagnetism...made of the coefficient C in the energy CK of a spin wave of small wave vector K in a ferromagnetic...with Nagaoka's work on spin wave energies in a nearly half-filled band...

1967-01-01T23:59:59.000Z

474

Universality of spin relaxation for spin-1/2 particles diffusing over magnetic-field inhomogeneities in the adiabatic regime  

Science Journals Connector (OSTI)

We present a theoretical analysis of spin relaxation, for a polarized gas of spin 1/2 particles undergoing restricted adiabatic diffusive motion within a container of arbitrary shape, due to magnetic field inhomogeneities of arbitrary form.

M. Guigue; G. Pignol; R. Golub; A. K. Petukhov

2014-07-09T23:59:59.000Z

475

Muon-spin spectroscopy of the organometallic spin-1/2 kagome-lattice compound Cu(1,3-benzenedicarboxylate)  

E-Print Network [OSTI]

Using muon-spin resonance, we examine the organometallic hybrid compound Cu(1,3-benzenedicarboxylate) [Cu(1,3-bdc)], which has structurally perfect spin-1/2 copper kagome planes separated by pure organic linkers. This ...

Marcipar, Lital

476

Shchelkin’s contribution to spin detonation studies and further development of the spin detonation theory  

Science Journals Connector (OSTI)

On the occasion of the 100th anniversary of K. I. Shchelkin, his publications on the detonation spin theory are reviewed. In those publications ... predicted the presence of a break on the detonation wave front, ...

M. E. Topchiyan

2012-05-01T23:59:59.000Z

477

The electron-spin-nuclear-spin interaction studied by polarized neutron scattering  

Science Journals Connector (OSTI)

The directional properties of electron-proton spin interaction in an external magnetic field give rise to an anisotropic distribution of the intensity of polarized neutron scattering from dynamically polarized protons of radical molecules in solution.

Stuhrmann, H.B.

2007-11-01T23:59:59.000Z

478

Heisenberg-Ising crossover in spin glasses  

Science Journals Connector (OSTI)

The small anisotropy always present in real spin glasses induces a finite-temperature phase transition of Ising character. We argue that the width of the Ising-like critical regime should be comparable with teh transition temperature itself. Furthermore, for realistic values of the anisotropy there is no well-defined Heisenberg-like critical regime at all.

A. J. Bray and M. A. Moore

1986-11-01T23:59:59.000Z

479

Koornwinder polynomials and the XXZ spin chain  

E-Print Network [OSTI]

Nonsymmetric Koornwinder polynomials are multivariable extensions of nonsymmetric Askey-Wilson polynomials. They naturally arise in the representation theory of (double) affine Hecke algebras. In this paper we discuss how nonsymmetric Koornwinder polynomials naturally arise in the theory of the Heisenberg XXZ spin-$\\frac{1}{2}$ chain with general reflecting boundary conditions. A central role in this story is played by an explicit two-parameter family of spin representations of the two-boundary Temperley-Lieb algebra. These spin representations have three different appearances. Their original definition relates them directly to the XXZ spin chain, in the form of matchmaker representations they relate to Temperley-Lieb loop models in statistical physics, while their realization as principal series representations leads to the link with nonsymmetric Koornwinder polynomials. The nonsymmetric difference Cherednik-Matsuo correspondence allows to construct for special parameter values Laurent-polynomial solutions of the associated reflection quantum KZ equations in terms of nonsymmetric Koornwinder polynomials. We discuss these aspects in detail by revisiting and extending work of De Gier, Kasatani, Nichols, Cherednik, the first author and many others.

Jasper Stokman; Bart Vlaar

2014-04-03T23:59:59.000Z

480

Spin-out Company Portfolio Technology Transfer  

E-Print Network [OSTI]

Spin-out Company Portfolio 2012 Technology Transfer The Sir Colin Campbell Building The University `Entrepreneurial University of the Year' in 2008. The Technology Transfer Office (TTO) has close links detail. Dr Susan Huxtable Director, Technology Transfer Tel: +44 (0)115 84 66388 Email: susan

Aickelin, Uwe

Note: This page contains sample records for the topic "magic angle spinning" 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

Single-spin asymmetries: The Trento conventions  

SciTech Connect (OSTI)

During the workshop 'Transversity: New Developments in Nucleon Spin Structure' (ECT, Trento, Italy, 14-18 June 2004), a series of recommendations was put forward by the participants concerning definitions and notations for describing effects of intrinsic transverse-momentum of partons in semi-inclusive deep inelastic scattering.

Bacchetta, Alessandro; D'Alesio, Umberto; Diehl, Markus; Miller, C. Andy [Institut fuer Theoretische Physik, Universitaet Regensburg, D-93040 Regensburg (Germany); INFN, Sezione di Cagliari and Dipartimento di Fisica, Universita di Cagliari, I-09042 Monserrato (Italy); Deutsches Elektronen-Synchroton DESY, D-22603 Hamburg (Germany); TRIUMF, Vancouver, British Columbia V6T 2A3 (Canada)

2004-12-01T23:59:59.000Z

482

The Phenomena of Spin in Detonation  

Science Journals Connector (OSTI)

... , the flame front was not simply a disc-like or convex surface, but the detonation spun spiralwise along the tube, giving rise to a banded appearance in the photographs ... Fraser2 made a careful photographic investigation of the phenomenon, which showed that the initiation of detonation was almost invariably associated with the spin of the ‘head’ of ...

A. C. E.

1935-12-21T23:59:59.000Z

483

Spin Relaxation of Hydrogen and Deuterium  

E-Print Network [OSTI]

Spin Relaxation of Hydrogen and Deuterium in Storage Cells Bernd Braun Ludwig and the relaxation measurements, to produce polarization of hydrogen or deuterium atoms in a storage cell \\Gamma3 for hydrogen and even only 10 \\Gamma4 for deuterium during the entire time in the storage cell

484

Thermodynamics of the Lévy spin glass  

Science Journals Connector (OSTI)

We investigate the Lévy glass, a mean-field spin-glass model with power-law distributed couplings characterized by a divergent second moment. By combining extensively many small couplings with a spare random backbone of strong bonds the model is intermediate between the Sherrington-Kirkpatrick and the Viana-Bray models. A truncated version where couplings smaller than some threshold ? are neglected can be studied within the cavity method developed for spin glasses on locally treelike random graphs. By performing the limit ??0 in a well-defined way we calculate the thermodynamic functions within replica symmetry and determine the de Almeida-Thouless line in the presence of an external magnetic field. Contrary to previous findings we show that there is no replica-symmetric spin-glass phase. Moreover we determine the leading corrections to the ground-state energy within one-step replica symmetry breaking. The effects due to the breaking of replica symmetry appear to be small in accordance with the intuitive picture that a few strong bonds per spin reduce the degree of frustration in the system.

K. Janzen; A. Engel; M. Mézard

2010-08-30T23:59:59.000Z

485

Fermi Liquid Instabilities in the Spin Channel  

SciTech Connect (OSTI)

We study the Fermi surface instabilities of the Pomeranchuk type in the spin triplet channel with high orbital partial waves (F{sub l}{sup a} (l > 0)). The ordered phases are classified into two classes, dubbed the {alpha} and {beta}-phases by analogy to the superfluid {sup 3}He-A and B-phases. The Fermi surfaces in the {alpha}-phases exhibit spontaneous anisotropic distortions, while those in the {beta}-phases remain circular or spherical with topologically non-trivial spin configurations in momentum space. In the {alpha}-phase, the Goldstone modes in the density channel exhibit anisotropic overdamping. The Goldstone modes in the spin channel have nearly isotropic underdamped dispersion relation at small propagating wavevectors. Due to the coupling to the Goldstone modes, the spin wave spectrum develops resonance peaks in both the {alpha} and {beta}-phases, which can be detected in inelastic neutron scattering experiments. In the p-wave channel {beta}-phase, a chiral ground state inhomogeneity is spontaneously generated due to a Lifshitz-like instability in the originally nonchiral systems. Possible experiments to detect these phases are discussed.

Wu, Congjun; /Santa Barbara, KITP; Sun, Kai; Fradkin, Eduardo; /Illinois U., Urbana; Zhang, Shou-Cheng; /Stanford U., Phys. Dept.

2010-03-16T23:59:59.000Z

486

Determination of gamma from charmless B+ -> M0 M+ decays using U-spin  

E-Print Network [OSTI]

U-spin is used to determine the unitarity angle gamma from two body decays of charged B-mesons. Each of the four data sets, P0P+, P0V+, V0P+ and V0V+, with P = pseudoscalar and V = vector, can give a value of gamma. Significant advantage of the method is that no assumptions regarding relative sizes of topological decay amplitudes need to be made so none is neglected. Application of the method to the existing data yields: gamma=54^{+12}_{-11} degrees. We find that improved measurements of phi pi+ and K*0bar K+ branching ratios would lead to appreciably better determination of gamma. In this method, which is completely data driven, we should be able to obtain a model independent determination of gamma with an accuracy of O(few degrees).

Soni, A; Soni, Amarjit; Suprun, Denis A.

2006-01-01T23:59:59.000Z

487

Spin fluctuations in the quasi-two-dimensional Heisenberg ferromagnet GdI2 studied by electron spin resonance  

Science Journals Connector (OSTI)

The spin dynamics of GdI2 have been investigated by electron spin resonance (ESR) spectroscopy. The temperature dependences of the resonance field and ESR intensity are well described by the model for the spin susceptibility proposed by Eremin et al.?[Phys. Rev. B 64, 064425 (2001)]. The temperature dependence of the resonance linewidth shows a maximum similar to the electrical resistance and is discussed in terms of scattering processes between conduction electrons and localized spins.

J. Deisenhofer; H.-A. Krug von Nidda; A. Loidl; K. Ahn; R. K. Kremer; A. Simon

2004-03-15T23:59:59.000Z

488

Angle-resolved photoemission spectroscopy (ARPES) studies of cuprate superconductors  

SciTech Connect (OSTI)

This dissertation is comprised of three different angle-resolved photoemission spectroscopy (ARPES) studies on cuprate superconductors. The first study compares the band structure from two different single layer cuprates Tl{sub 2}Ba{sub 2}CuO{sub 6+{delta}} (Tl2201) T{sub c,max} {approx} 95 K and (Bi{sub 1.35}Pb{sub 0.85})(Sr{sub 1.47}La{sub 0.38})CuO{sub 6+{delta}} (Bi2201) T{sub c,max} {approx} 35 K. The aim of the study was to provide some insight into the reasons why single layer cuprate's maximum transition temperatures are so different. The study found two major differences in the band structure. First, the Fermi surface segments close to ({pi},0) are more parallel in Tl2201 than in Bi2201. Second, the shadow band usually related to crystal structure is only present in Bi2201, but absent in higher T{sub c} Tl2201. The second study looks at the different ways of doping Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}} (Bi2212) in-situ by only changing the post bake-out vacuum conditions and temperature. The aim of the study is to systematically look into the generally overlooked experimental conditions that change the doping of a cleaved sample in ultra high vacuum (UHV) experiments. The study found two major experimental facts. First, in inadequate UHV conditions the carrier concentration of Bi2212 increases with time, due to the absorption of oxygen from CO{sub 2}/CO molecules, prime contaminants present in UHV systems. Second, in a very clean UHV system at elevated temperatures (above about 200 K), the carrier concentration decreases due to the loss of oxygen atoms from the Bi-O layer. The final study probed the particle-hole symmetry of the pseudogap phase in high temperature superconducting cuprates by looking at the thermally excited bands above the Fermi level. The data showed a particle-hole symmetric pseudogap which symmetrically closes away from the nested FS before the node. The data is consistent with a charge density wave (CDW) origin of the pseudogap, similar to STM checkerboard patterns in the pseudogap state.

Palczewski, Ari Deibert

2010-12-15T23:59:59.000Z

489

Measurements of the CKM Angle phi3/gamma  

SciTech Connect (OSTI)

We present a review on the measurements of the CKM angle {gamma} ({phi}{sub 3}){sup 1} as performed by the BABAR and Belle experiments at the asymmetric-energy e{sup +}e{sup -} B factories colliders PEP-II and KEKB. These measurements are using either charged or neutral B decays. For charged B decays the modes {tilde D}{sup 0}K{sup -}, {tilde D}*{sup 0}K{sup -}, and {tilde D}{sup 0}K*{sup -} are employed, where {tilde D}{sup 0} indicates either a D{sup 0} or a {bar D}{sup 0} meson. Direct CP violation is exploited. It is caused by interferences between V{sub ub} and V{sub cb} accessible transitions that generate asymmetries in the final states. For these decays various methods exist to enhance the sensitivity to the V{sub ub} transition, carrying the weak phase {gamma}. For neutral B decays, the modes D{sup (*){+-}}{pi}{sup {-+}} and D{sup {+-}}{rho}{sup {-+}} are used. In addition to the V{sub ub} and V{sub cb} interferences, these modes are sensitive to the B{sup 0}-{bar B}{sup 0} mixing, so that time dependent analyses are performed to extract sin(2{beta} + {gamma}). An alternative method would use the lower branching ratios decay modes {tilde D}{sup (*)0}{bar K}{sup (*)0} where much larger asymmetries are expected. The various available methods are mostly ''theoretically clean'' and always free of penguins diagrams. In some cases a high sensitivity to {gamma} is expected and large asymmetries may be seen. But these measurements are always experimentally difficult as one has to face with either low branching ratios, or small asymmetries, or additional technical/theoretical difficulties due to Dalitz/SU(3) and re-scattering models needed to treat/estimate nuisance parameters such as unknown strong phases and the relative magnitude of the amplitude of the interfering ''V{sub ub}'' transitions. Thus at the present time only a relatively limited precision on {gamma} can be extracted from these measurements. The current world average is {gamma} = (78{sub -26}{sup +19}){sup o} [1]. For other methods and long term perspectives, as discussed in details, the reader is invited to consult the proceedings of the recent CKM workshop that was held in Nagoya (Japan) in December 2006 [2].

Tisserand, Vincent; /Annecy, LAPP

2007-06-27T23:59:59.000Z

490

Spin Correlations in a Magnetic Electron Gas  

Science Journals Connector (OSTI)

The density response function (???), the longitudinal spin-correlation function (?zz), the transverse spin-correlation function (?-+), and the cross-correlation function (??z) involving the density and the z component of spin density are computed by employing two generalized moment-conserving (MC) schemes for a magnetic electron gas. The two schemes differ in their treatment of the one-electron states. These functions are also computed in the random-phase approximation (RPA) including exchange processes, in two different ways, by solving the resulting integral equations by a variational method due to one of the authors. We prove that in the absence of spin-orbit interactions, ??z(q?,?)=?z?(q?,?), which enables us to set up a consistent MC scheme. In the paramagnetic state, only ??? and ?zz are independent, and in the long-wavelength static limit they yield results in accordance with the RPA scheme. The plasma dispersion law for long wavelength is also found to be identical in the MC and RPA scheme. In the ferromagnetic case, one of the MC schemes gives the same results as the RPA results for the Stoner model, and very different results for the Coulomb gas. The long-wavelength spin-wave dispersion is found to be different in the two schemes. A new nonlocal-zero-moment-conserving scheme is set up which gives the same equations as the RPA. It is thus concluded that a local-MC scheme is different from the RPA by virtue of the actual structure of the correlation functions, even though in the paramagnetic limit the results are similar for the static long-wavelength limit.

A. K. Rajagopal, J. Rath, and John C. Kimball

1973-03-15T23:59:59.000Z

491

Enhancement of spin coherence in a spin-1 Bose-Einstein condensate by dynamical decoupling approaches  

SciTech Connect (OSTI)

We study the enhancement of spin coherence with periodic, concatenated, or Uhrig dynamical decoupling N-pulse sequences in a spin-1 Bose-Einstein condensate, where the intrinsic dynamical instability in such a ferromagnetically interacting condensate causes spin decoherence and eventually leads to a multiple spatial-domain structure or a spin texture. Our results show that all three sequences successfully enhance the spin coherence by pushing the wave vector of the most unstable mode in the condensate to a larger value. Among the three sequences with the same number of pulses, the concatenated one shows the best performance in preserving the spin coherence. More interestingly, we find that all three sequences exactly follow the same enhancement law, k{sub -}T{sup 1/2}=c, with k{sub -} the wave vector of the most unstable mode, T the sequence period, and c a sequence-dependent constant. Such a law between k{sub -} and T is also derived analytically for an attractive scalar Bose-Einstein condensate subjected to a periodic dynamical decoupling sequence.

Ning Boyuan; Zhuang Jun; Zhang Wenxian [Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Department of Optical Science and Engineering, Fudan University, Shanghai 200433 (China); You, J. Q. [Department of Physics, Fudan University, Shanghai 200433 (China)

2011-07-15T23:59:59.000Z

492

Time-Resolved Small-Angle Neutron Scattering Study of Polyethylene Crystallization from Solution  

E-Print Network [OSTI]

Time-Resolved Small-Angle Neutron Scattering Study of Polyethylene Crystallization from Solution-resolved small-angle neutron scattering (TR-SANS), the crystal- lization kinetics of polyethylene from deuterated of polyethylene crystallization from xylene solutions. One unique feature of this experimentation is that both

Wang, Howard "Hao"

493

Small angle neutron scattering from single-wall carbon nanotube suspensions: evidence for isolated  

E-Print Network [OSTI]

Small angle neutron scattering from single-wall carbon nanotube suspensions: evidence for isolated online: Abstract We report small angle neutron scattering (SANS) from dilute suspensions of purified University, Houghton, MI 49931, USA e NIST Center for Neutron Research, National Institute of Standards

Wang, Howard "Hao"

494

Small angle neutron scattering (SANS) under non-equilibrium conditions R. C. Oberthr  

E-Print Network [OSTI]

663 Small angle neutron scattering (SANS) under non-equilibrium conditions R. C. Oberthür Institut with the times obtained from quasi- elastic neutron and light scattering, which yield information about neutrons aux petits angles (DNPA) pour l'étude des systèmes hors d'équi- libre thermodynamique est

Boyer, Edmond

495

Solvent Entrainment in and Flocculation of Asphaltenic Aggregates Probed by Small-Angle Neutron Scattering  

E-Print Network [OSTI]

-Angle Neutron Scattering Keith L. Gawrys, George A. Blankenship, and Peter K. Kilpatrick* Department of ChemicalVed September 14, 2005. In Final Form: January 30, 2006 While small-angle neutron scattering (SANS) has proven to the scattering intensity curves were performed using the Guinier approximation, the Ornstein- Zernike (or Zimm

Kilpatrick, Peter K.

496

Small angle neutron scattering on periodically deformed polymers A. R. Rennie  

E-Print Network [OSTI]

765 Small angle neutron scattering on periodically deformed polymers A. R. Rennie Institut für Phys-768 SEPTEMBRE 1984, 1. Introduction. Neutron scattering has proved a useful tool for the investigation of a wide time for a small angle neutron scattering spectrum is several minutes. Obser- vation on rapidly

Boyer, Edmond

497

High temperature furnaces for small and large angle neutron scattering of disordered materials  

E-Print Network [OSTI]

725 High temperature furnaces for small and large angle neutron scattering of disordered materials and small angle neutron scattering (SANS) experiments respectively. They are vacuum furnaces with a thin maintained in a tantalum box. In a neutron beam, the furnaces produce a very low scattering level (without

Boyer, Edmond

498

Salt-Dependent Compaction of Di-and Trinucleosomes Studied by Small-Angle Neutron Scattering  

E-Print Network [OSTI]

Salt-Dependent Compaction of Di- and Trinucleosomes Studied by Small-Angle Neutron Scattering, Germany, and Institut Laue-Langevin Grenoble, F-38042 Grenoble, France ABSTRACT Using small-angle neutron scattering (SANS), we have measured the salt-dependent static structure factor of di- and trinucleosomes from

Langowski, Jörg

499

Simulation-guided optimization of small-angle analyzer geometry in the neutron backscattering spectrometer SPHERES  

SciTech Connect (OSTI)

The resolution of neutron backscattering spectrometers deteriorates at small scattering angles where analyzers deviate from exact backscattering. By reducing the azimuth angle range of the analyzers, the resolution can be improved with little loss of peak intensity. Measurements at the spectrometer SPHERES are in excellent agreement with simulations, which proves the dominance of geometric effects.

Wuttke, Joachim; Zamponi, Michaela [Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science at MLZ, Lichtenbergstraße 1, 85747 Garching (Germany)] [Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science at MLZ, Lichtenbergstraße 1, 85747 Garching (Germany)

2013-11-15T23:59:59.000Z

500

Elastic Scattering of O16 on O18 Including Backward Angles  

Science Journals Connector (OSTI)

The elastic scattering of O16 on O18 has been measured for incident beam energies of Elab=24,28, and 32 MeV at center-of-mass angles up to 150°. The angular distributions exhibit pronounced oscillations at backward angles which may be interpreted as due to the occurrence of an elastic transfer.

C. K. Gelbke; R. Bock; P. Braun-Munzinger; D. Fick; K. D. Hildenbrand; A. Richter; W. Weiss

1972-12-18T23:59:59.000Z