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Note: This page contains sample records for the topic "monochromator sgm gratings" from the National Library of EnergyBeta (NLEBeta).
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1

Monochromator Crystal Glitch Library  

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

SSRL's Monochromator Crystal Glitch Library allows users to view glitch spectra online, list specific crystal orientations, and download PDF files of the glitch spectra. (Specialized Interface)

2

Optical system for high resolution spectrometer/monochromator  

DOE Patents [OSTI]

An optical system for use in a spectrometer or monochromator employing a mirror which reflects electromagnetic radiation from a source to converge with same in a plane is disclosed. A straight grooved, varied-spaced diffraction grating receives the converging electromagnetic radiation from the mirror and produces a spectral image for capture by a detector, target or like receiver. 11 figs.

Hettrick, M.C.; Underwood, J.H.

1988-10-11T23:59:59.000Z

3

Pulsed-neutron monochromator  

DOE Patents [OSTI]

In one aspect, the invention is an improved pulsed-neutron monochromator of the vibrated-crystal type. The monochromator is designed to provide neutron pulses which are characterized both by short duration and high density. A row of neutron-reflecting crystals is disposed in a neutron beam to reflect neutrons onto a common target. The crystals in the row define progressively larger neutron-scattering angles and are vibrated sequentially in descending order with respect to the size of their scattering angles, thus generating neutron pulses which arrive simultaneously at the target. Transducers are coupled to one end of the crystals to vibrate them in an essentially non-resonant mode. The transducers propagate transverse waves in the crystal which progress longitudinally therein. The waves are absorbed at the undriven ends of the crystals by damping material mounted thereon. In another aspect, the invention is a method for generating neutron pulses characterized by high intensity and short duration.

Mook, H.A. Jr.

1984-01-01T23:59:59.000Z

4

Pulsed-neutron monochromator  

DOE Patents [OSTI]

In one aspect, the invention is an improved pulsed-neutron monochromator of the vibrated-crystal type. The monochromator is designed to provide neutron pulses which are characterized both by short duration and high density. A row of neutron-reflecting crystals is disposed in a neutron beam to reflect neutrons onto a common target. The crystals in the row define progressively larger neutron-scattering angles and are vibrated sequentially in descending order with respect to the size of their scattering angles, thus generating neutron pulses which arrive simultaneously at the target. Transducers are coupled to one end of the crystals to vibrate them in an essentially non-resonant mode. The transducers propagate transverse waves in the crystal which progress longitudinally therein. The wave are absorbed at the undriven ends of the crystals by damping material mounted thereon. In another aspect, the invention is a method for generating neutron pulses characterized by high intensity and short duration.

Mook, Jr., Herbert A. (Oak Ridge, TN)

1985-01-01T23:59:59.000Z

5

Water-cooled ion-milled diffraction gratings for the synchrotron radiation community  

SciTech Connect (OSTI)

Key technical and strategic choices are reviewed, leading to the fabrication method of ion-milled grating grooves for the monochromators at the Advanced Light Source (ALS) at Lawrence Berkeley Laboratory (LBL), and for other synchrotrons. Several laboratories and their industrial partners have joined to manufacture gratings with essentially theoretical performance. Metrology -data and theoretical comparisons are given for square wave profile grating samples ion-milled into electroless nickel surfaces. The extensive capabilities of Hughes Aircraft in grating manufacture are reviewed.

McKinney, W.R.; Shannon, C.L.; Shults, E.N.

1993-08-01T23:59:59.000Z

6

Efficiency and stray light measurements and calculations of diffraction gratings for the Advanced Light Source  

SciTech Connect (OSTI)

Water-cooled gratings manufactured for spherical grating monochromators of the Advanced Light Source beamlines 7.0, 8.0, and 9.0 were measured with the laser plasma source and reflectometer in the Center for X-ray Optics at Lawrence Berkeley Laboratory. The square-wave gratings are ion milled into the polished electroless nickel surface after patterning by holographic photolithography. Absolute efficiency data are compared with exact electromagnetic theory calculation. Interorder stray light and groove depths can be estimated from the measurements.

McKinney, W.R.; Mossessian, D. (Accelerator and Fusion Research Division, Advanced Light Source, Lawrence Berkeley Laboratory, Berkeley, California 94720 (United States)); Gullikson, E. (Materials Sciences Division, Center for X-ray Optics, Lawrence Berkeley Laboratory, Berkeley, California 94720 (United States)); Heimann, P. (Accelerator and Fusion Research Division, Advanced Light Source, Lawrence Berkeley Laboratory, Berkeley, California 94720 (United States))

1995-02-01T23:59:59.000Z

7

Efficiency and stray light measurements and calculations of diffraction gratings for the ALS  

SciTech Connect (OSTI)

Water cooled gratings manufactured for spherical grating monochromators of the Advanced Light Source beamlines 7.0, 8.0 and 9.0 were measured with the laser plasma source and reflectometer in the Center for X-ray Optics at LBL. The square-wave gratings are ion-milled into the polished electroless nickel surface after patterning by holographic photolithography. Absolute efficiency data are compared with exact electromagnetic theory calculation. Inter-order stray light and groove depths can be estimated from the measurements.

McKinney, W.R.; Mossessian, D.; Gullikson, E.; Heimann, P.

1994-07-01T23:59:59.000Z

8

High energy resolution, high angular acceptance crystal monochromator  

DOE Patents [OSTI]

A 4-bounce dispersive crystal monochromator reduces the bandpass of synchrotron radiation to a 10-50 meV range without sacrificing angular acceptance. The monochromator includes the combination of an asymmetrical channel-cut single crystal of lower order reflection and a symmetrical channel-cut single crystal of higher order reflection in a nested geometric configuration. In the disclosed embodiment, a highly asymmetrically cut (.alpha.=20) outer silicon crystal (4 2 2) with low order reflection is combined with a symmetrically cut inner silicon crystal (10 6 4) with high order reflection to condition a hard x-ray component (5-30 keV) of synchrotron radiation down to the .mu.eV-neV level. Each of the crystals is coupled to the combination of a positioning inchworm and angle encoder via a respective rotation stage for accurate relative positioning of the crystals and precise energy tuning of the monochromator.

Alp, Ercan E. (Bolingbrook, IL); Mooney, Timothy M. (Westmont, IL); Toellner, Thomas (Green Bay, WI)

1996-06-04T23:59:59.000Z

9

Multilayers and Crystal for a Multi-bandpass Monochromator  

SciTech Connect (OSTI)

VESPERS beamline is a hard X-ray microprobe beamline dedicated to micro-diffraction and micro-fluorescence analysis at the Canadian Light Source; it requires multi-bandpass X-ray beams for different types of samples and experiments. A specially designed double crystal/multilayer monochromator was built for this purpose with three different bandpasses: 0.01%, 1.6% and 10%. The diffraction elements used for the monochromator have a triple-stripe design using Si(111) crystal as a single substrate with two differing stripes of Mo/B4C multilayers deposited thereon. The uncovered Si(111) section provides a 0.01% bandpass, while the periodic and depth-graded Mo/B4C multilayers provide 1.6% and 10% bandpasses, respectively. This paper outlines the requirements and specifications of the diffracting elements as well as the design, deposition and optimization of the multilayers. The performance of the deposited multilayer structures has been tested using Cu-Ka radiation line with a Huber diffractometer.

Feng, Renfei [Canadian Light Source, Saskatoon, Canada; Platonov, Yuriy [Rigaku Innovative Technologies, Inc., Auburn Hills, Michigan; Broadway, David [Rigaku Innovative Technologies, Inc., Auburn Hills, Michigan; Ice, Gene E [ORNL; Gerson, Andrea [University of South Australia; McIntyre, Stewart [University of Western Ontario, The

2008-01-01T23:59:59.000Z

10

Performance of a beam-multiplexing diamond crystal monochromator at the Linac Coherent Light Source  

SciTech Connect (OSTI)

A double-crystal diamond monochromator was recently implemented at the Linac Coherent Light Source. It enables splitting pulses generated by the free electron laser in the hard x-ray regime and thus allows the simultaneous operations of two instruments. Both monochromator crystals are High-Pressure High-Temperature grown type-IIa diamond crystal plates with the (111) orientation. The first crystal has a thickness of ?100 ?m to allow high reflectivity within the Bragg bandwidth and good transmission for the other wavelengths for downstream use. The second crystal is about 300 ?m thick and makes the exit beam of the monochromator parallel to the incoming beam with an offset of 600 mm. Here we present details on the monochromator design and its performance.

Zhu, Diling, E-mail: dlzhu@slac.stanford.edu; Feng, Yiping; Lemke, Henrik T.; Fritz, David M.; Chollet, Matthieu; Glownia, J. M.; Alonso-Mori, Roberto; Sikorski, Marcin; Song, Sanghoon; Williams, Garth J.; Messerschmidt, Marc; Boutet, Sébastien; Robert, Aymeric [Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025 (United States); Stoupin, Stanislav; Shvyd'ko, Yuri V. [Advanced Photon Source, Argonne National Laboratory, Lemont, Illinois 60439 (United States); Terentyev, Sergey A.; Blank, Vladimir D. [Technological Institute of Superhard and Novel Carbon Materials, Tsentralnaya str. 7a, Troitsk, Moscow 142190 (Russian Federation); Driel, Tim B. van [Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025 (United States); Center for Molecular Movies, Department of Physics, Technical University of Denmark, DK-2800 Lyngby (Denmark)

2014-06-15T23:59:59.000Z

11

Finite element analysis of the distortion of a crystal monochromator from synchrotron radiation thermal loading  

SciTech Connect (OSTI)

The first crystal of the Brown-Hower x-ray monochromator of the LBL-EXXON 54 pole wiggler beamline at Stanford Synchrotron Radiation Laboratory (SSRL) is subjected to intense synchrotron radiation. To provide an accurate thermal/structural analysis of the existing monochromator design, a finite element analysis (FEA) was performed. A very high and extremely localized heat flux is incident on the Si (220) crystal. The crystal, which possesses pronouncedly temperature-dependent orthotropic properties, in combination with the localized heat load, make the analysis ideally suited for finite element techniques. Characterization of the incident synchrotron radiation is discussed, followed by a review of the techniques employed in modeling the monochromator and its thermal/structural boundary conditions. The results of the finite element analysis, three-dimensional temperature distributions, surface displacements and slopes, and stresses, in the area of interest, are presented. Lastly, the effects these results have on monochromator output flux and resolution are examined.

Edwards, W.R.; Hoyer, E.H.; Thompson, A.C.

1985-10-01T23:59:59.000Z

12

Electrically-programmable diffraction grating  

DOE Patents [OSTI]

An electrically-programmable diffraction grating is disclosed. The programmable grating includes a substrate having a plurality of electrodes formed thereon and a moveable grating element above each of the electrodes. The grating elements are electrostatically programmable to form a diffraction grating for diffracting an incident beam of light as it is reflected from the upper surfaces of the grating elements. The programmable diffraction grating, formed by a micromachining process, has applications for optical information processing (e.g. optical correlators and computers), for multiplexing and demultiplexing a plurality of light beams of different wavelengths (e.g. for optical fiber communications), and for forming spectrometers (e.g. correlation and scanning spectrometers). 14 figs.

Ricco, A.J.; Butler, M.A.; Sinclair, M.B.; Senturia, S.D.

1998-05-26T23:59:59.000Z

13

Charged particle accelerator grating  

DOE Patents [OSTI]

A readily disposable and replaceable accelerator grating for a relativistic particle accelerator is described. The grating is formed for a plurality of liquid droplets that are directed in precisely positioned jet streams to periodically dispose rows of droplets along the borders of a predetermined particle beam path. A plurality of lasers are used to direct laser beams onto the droplets, at predetermined angles, thereby to excite the droplets to support electromagnetic accelerating resonances on their surfaces. Those resonances operate to accelerate and focus particles moving along the beam path. As the droplets are distorted or destroyed by the incoming radiation, they are replaced at a predetermined frequency by other droplets supplied through the jet streams.

Palmer, R.B.

1985-09-09T23:59:59.000Z

14

Supersymmetric Bragg gratings  

E-Print Network [OSTI]

The supersymmetric (SUSY) structure of coupled-mode equations that describe scattering of optical waves in one-dimensional Bragg gratings is highlighted. This property can find applications to the synthesis of special Bragg filters and distributed-feedback (DFB) optical cavities. In particular, multiple SUSY (Darboux-Crum) transformations can be used to synthesize DFB filters with any desired number of resonances at target frequencies. As an example, we describe the design of a DFB structure with a set of equally-spaced resonances, i.e. a frequency comb transmission filter.

Longhi, Stefano

2015-01-01T23:59:59.000Z

15

Jay Grate | EMSL  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsruc DocumentationP-SeriesFlickrinformation forTechnologies | Blandine JeromeJason HickJay Grate

16

Inclined monochromator for high heat-load synchrotron x-ray radiation  

DOE Patents [OSTI]

A double crystal monochromator is described including two identical, parallel crystals, each of which is cut such that the normal to the diffraction planes of interest makes an angle less than 90 degrees with the surface normal. Diffraction is symmetric, regardless of whether the crystals are symmetrically or asymmetrically cut, enabling operation of the monochromator with a fixed plane of diffraction. As a result of the inclination of the crystal surface, an incident beam has a footprint area which is elongated both vertically and horizontally when compared to that of the conventional monochromator, reducing the heat flux of the incident beam and enabling more efficient surface cooling. Because after inclination of the crystal only a fraction of thermal distortion lies in the diffraction plane, slope errors and the resultant misorientation of the diffracted beam are reduced. 11 figures.

Khounsary, A.M.

1994-02-15T23:59:59.000Z

17

Theoretical efficiency analysis of a condenser-embedded grating-based spectral purity filter for EUV lithography  

SciTech Connect (OSTI)

Being based on reflective optics, extreme ultraviolet (EUV) lithography systems are, in principle, relatively immune to chromatic errors. However, illumination bandwidth control is still required for EUV lithography. For example, appreciable amounts of UV power, combined with resist sensitivity to this wavelength band, would decrease image contrast. Also, appreciable amounts of IR power would place unacceptable thermal loads on the projection optics. A practical method for spectral filtering, widely used in short-wavelength synchrotron applications, is the grating monochromator. Here we present the theoretical performance analysis of a grating-based spectral purity filter integrated into an EUV lithography condenser system. Although the specific examples presented here are geared towards a specific condenser design, it should be noted that the methods described are generally applicable to a variety of condenser designs as might be found in future EUV lithography systems.

Naulleau, Patrick P.; Sweatt, William C.; Tichenor, Daniel A.

2002-09-02T23:59:59.000Z

18

Component/OEM XC-HR50 High Frame Rate Monochrome Camera  

E-Print Network [OSTI]

Monochrome Camera B/W Progressive Scan Cameras #12;These new cameras expand the range of products in Sony's progressive scan and high-frame rate, compact camera line up! Introducing the newest additions to Sony's B/sec. for compatibility with slower vision systems using Sony XC-55 cameras. The XC-HR50 and XC-HR70 cameras incorporate

Demoulin, Pascal

19

Fiber Grating Environmental Sensing System  

DOE Patents [OSTI]

Fiber grating environmental measurement systems are comprised of sensors that are configured to respond to changes in moisture or chemical content of the surrounding medium through the action of coatings and plates inducing strain that is measured. These sensors can also be used to monitor the interior of bonds for degradation due to aging, cracking, or chemical attack. Means to multiplex these sensors at high speed and with high sensitivity can be accomplished by using spectral filters placed to correspond to each fiber grating environmental sensor. By forming networks of spectral elements and using wavelength division multiplexing arrays of fiber grating sensors may be processed in a single fiber line allowing distributed high sensitivity, high bandwidth fiber optic grating environmental sensor systems to be realized.

Schulz, Whitten L. (Fairview, OR); Udd, Eric (Fairview, OR)

2003-07-29T23:59:59.000Z

20

ALS Scientists Patent Technique To Dramatically Advance Grating...  

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

ALS Scientists Patent Technique To Dramatically Advance Grating-Based Spectroscopy ALS Scientists Patent Technique To Dramatically Advance Grating-Based Spectroscopy Print Gratings...

Note: This page contains sample records for the topic "monochromator sgm gratings" 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

Micropatterned Polymeric Gratings as Chemoresponsive Volatile Organic Compound  

E-Print Network [OSTI]

Micropatterned Polymeric Gratings as Chemoresponsive Volatile Organic Compound Sensors, Northwestern University, Evanston, Illinois 60208 Micropatterned polymeric diffraction gratings have been

22

Fabrication of extremely smooth blazed diffraction gratings  

E-Print Network [OSTI]

High efficiency diffraction gratings are important in a variety of applications, such as optical telecommunications, lithography, and spectroscopy. Special interest has been placed on blazed diffraction gratings for their ...

Chang, Chih-Hao, 1980-

2004-01-01T23:59:59.000Z

23

Subband coding of monochrome images over binary symmetric channels with error correction  

E-Print Network [OSTI]

for the degree of MASTER OF SCIENCE December 1992 Major Subject: Electrical Engineering SUBBAND CODING OF MONOCHROME IMAGES OVER BINARY SYMMETRIC CHANNELS WITH ERROR CORRECTION A Thesis by DENISE M. SHEPPARD Approved as to style and content by: V.... State diagram analysis of error recovery . B. Codebook design C. Performance results . 16 18 23 29 42 48 V VI ERROR CORRECTION A. Algorithm B. Performance Results CONCLUSION REFERENCES APPENDIX A . APPENDIX B . 52 54 61 67 70...

Sheppard, Denise M

2012-06-07T23:59:59.000Z

24

Compact Imaging Spectrometer Utilizing Immersed Gratings  

DOE Patents [OSTI]

A compact imaging spectrometer with an immersive diffraction grating that compensates optical distortions. The imaging spectrometer comprises an entrance slit for transmitting light, a system for receiving the light and directing the light, an immersion grating, and a detector array. The entrance slit, the system for receiving the light, the immersion grating, and the detector array are positioned wherein the entrance slit transmits light to the system for receiving the light and the system for receiving the light directs the light to the immersion grating and the immersion grating receives the light and directs the light through an optical element to the detector array.

Chrisp, Michael P. (Danville, CA); Lerner, Scott A. (Corvallis, OR); Kuzmenko, Paul J. (Livermore, CA); Bennett, Charles L. (Livermore, CA)

2006-03-21T23:59:59.000Z

25

Demonstrations of diode-pumped and grating-tuned ZnSe:Cr{sup 2+} lasers  

SciTech Connect (OSTI)

Within the last few years, divalent-transition-metal-doped II-VI material class has been proposed as source of new tunable mid-IR lasers. Cr{sup 2+} is a prime laser candidate on account of its high luminescence quantum yield and the expectation that ESA would be absent. The first ZnSe:Cr{sup 2+} laser demonstrations were conducted in an end-pumped geometry with a tightly focused (0.2 mm spot) MgF{sub 2}-Co{sup 2+} laser beam, for a peak pump intensity well over 100 kW/cm{sup 2}, so laser threshold was easily reached. Grating tuning experiments were done by replacing the cavity high-reflector with a diffraction grating. The diode array was removed and pump beam from a MgF{sub 2}:Co{sup 2+} laser was focused onto the crystal using the same cylindrical lens. Output wavelengths were checked with a monochromator. The long-wavelength limit of operation was 2799 nm. Short-wavelength cutoff was 2134 nm; even though the emission cross section remains substantial, self-absorption inhibits laser operation.

Page, R.H.; Skidmore, J.A.; Schaffers, K.I.; Beach, R.J.; Payne, S.A.; Krupke, W.F.

1996-09-01T23:59:59.000Z

26

Analysis of higher harmonic contamination with a modified approach using a grating analyser  

SciTech Connect (OSTI)

Soft x-ray spectra of the toroidal grating monochromator (TGM) at the reflectivity beamline of Indus-1 synchrotron source are analyzed for higher harmonic contribution. A diffraction grating of central line spacing 1200 l/mm is used to disperse the monochromatic beam received from TGM to quantify the harmonic contents in the 50–360 Å wavelength range. In order to calculate the harmonic contamination, conventionally the intensity of higher order peak is divided by first order peak intensity of the desired wavelength. This approach is found to give wrong estimate as first order peak itself is overlapped by higher order peaks. In the present study, a modified approach has been proposed to calculate harmonic contamination where the intensity contributions of overlapping orders have been removed from the first order diffraction peak of the desired wavelength. It is found that the order contamination in the TGM spectra is less than 15% in the wavelength range of 90–180 Å. The total harmonic contribution increases from 6%–60% in the wavelength range of 150–260 Å. The critical wavelength of Indus-1 is 61 Å hence the harmonic contamination below 90 Å is significantly low. The results obtained with modified approach match well with those obtained by quantitative analysis of multilayer reflectivity data. The obtained higher harmonics data are used to fit the transmission of aluminum edge filter in the 120–360 Å wavelength range.

Gupta, Rajkumar, E-mail: rkg@rract.gov.in; Modi, Mohammed H.; Lodha, G. S. [X-ray Optics Section, Indus Synchrotrons Utilization Division, Raja Ramanna Centre for Advanced Technology, Indore 452 013 (India)] [X-ray Optics Section, Indus Synchrotrons Utilization Division, Raja Ramanna Centre for Advanced Technology, Indore 452 013 (India); Kumar, M.; Chakera, J. A. [Laser Plasma Division, Raja Ramanna Centre for Advanced Technology, Indore 452 013 (India)] [Laser Plasma Division, Raja Ramanna Centre for Advanced Technology, Indore 452 013 (India)

2014-04-15T23:59:59.000Z

27

Diffraction gratings used as identifying markers  

DOE Patents [OSTI]

A finely detailed diffraction grating is applied to an object as an identifier or tag which is unambiguous, difficult to duplicate, or remove and transfer to another item, and can be read and compared with prior readings with relative ease. The exact pattern of the diffraction grating is mapped by diffraction moire techniques and recorded for comparison with future readings of the same grating. 7 figures.

Deason, V.A.; Ward, M.B.

1991-03-26T23:59:59.000Z

28

A dynamic focusing x-ray monochromator for a wiggler beam line at the SRS of the SERC Daresbury Laboratory  

SciTech Connect (OSTI)

A Si(220) double-crystal monochromator for the energy range 10--30 keV is presented. It will be used for EXAFS as well as powder diffraction measurements. To determine the requirements for this monochromator we looked, apart from mean considerations, at the requirements dictated by EXAFS in transmission mode. For good data analyses the proper shape, amplitude, and location at the energy axis of each wiggle is required. Moreover it is essential to separate the wiggles from background and noise. For the latter a high flux through the sample is desirable, which can be achieved by horizontal focusing of the beam. For that we have chosen to bend the second crystal sagitally. The sagittal bending radius is adjustable between 50 and 0.8 m, because for different energies different sagittal radii are necessary to focus the beam on the sample. The mean meridional radius of the second crystal is fixed at 130 m, which is an optimization for 20 keV. The meridional radius of the first crystal can be tuned between 100 and 500 m. When this radius is set to 130 m the energy resolution is calculated to be 6, 3, and 35 eV for 10, 20, and 30 keV (for perfectly bent crystals). By changing the meridional radius of the first crystal, future users of this monochromator can make the trade off between resolution and intensity. Movement of the monochromator exit beam, during a scan, will occur due to the monochromator geometry, but is reduced as much as possible by using an asymmetrically cut second crystal, with an asymmetry angle of 2.5{degree}. The average exit beam movement of the monochromator for a 1-keV scan is 20 {mu}m. For 40% of the energy range (10--30 keV) the exit beam position remains within 10 {mu}m. For the second crystal no translation stage is used.

De Bruijn, D.; Van Zuylen, P. (TNO Institute of Applied Physics, P.O. Box 155, 2600 AD Delft (Netherlands)); Kruizinga, G. (Netherlands Organization for Scientific Research (NWO), P.O. Box 93138, 2509 AC Den Haag (Netherlands) State University of Utrecht, Sorbonnelaan 16, 3508 TB Utrecht (Netherlands))

1992-01-01T23:59:59.000Z

29

Fiber optic diffraction grating maker  

DOE Patents [OSTI]

A compact and portable diffraction grating maker is comprised of a laser beam, optical and fiber optics devices coupling the beam to one or more evanescent beam splitters, and collimating lenses or mirrors directing the split beam at an appropriate photosensitive material. The collimating optics, the output ends of the fiber optic coupler and the photosensitive plate holder are all mounted on an articulated framework so that the angle of intersection of the beams can be altered at will without disturbing the spatial filter, collimation or beam quality, and assuring that the beams will always intersect at the position of the plate. 4 figures.

Deason, V.A.; Ward, M.B.

1991-05-21T23:59:59.000Z

30

Fiber optic diffraction grating maker  

DOE Patents [OSTI]

A compact and portable diffraction grating maker comprised of a laser beam, optical and fiber optics devices coupling the beam to one or more evanescent beam splitters, and collimating lenses or mirrors directing the split beam at an appropriate photosensitive material. The collimating optics, the output ends of the fiber optic coupler and the photosensitive plate holder are all mounted on an articulated framework so that the angle of intersection of the beams can be altered at will without disturbing the spatial filter, collimation or beam quality, and assuring that the beams will always intersect at the position of the plate.

Deason, Vance A. (Idaho Falls, ID); Ward, Michael B. (Idaho Falls, ID)

1991-01-01T23:59:59.000Z

31

Compact imaging spectrometer utilizing immersed gratings  

DOE Patents [OSTI]

A compact imaging spectrometer with an immersive diffraction grating that compensates optical distortions. The imaging spectrometer comprises an entrance slit for transmitting light, means for receiving the light and directing the light, an immersion grating, and a detector array. The entrance slit, the means for receiving the light, the immersion grating, and the detector array are positioned wherein the entrance slit transmits light to the means for receiving the light and the means for receiving the light directs the light to the immersion grating and the immersion grating receives the light and directs the light to the means for receiving the light, and the means for receiving the light directs the light to the detector array.

Chrisp, Michael P. (Danville, CA); Lerner, Scott A. (Corvallis, OR); Kuzmenko, Paul J. (Livermore, CA); Bennett, Charles L. (Livermore, CA)

2007-07-03T23:59:59.000Z

32

Grating enhanced solid-state laser amplifiers  

DOE Patents [OSTI]

A novel method and apparatus for suppressing ASE and parasitic oscillation modes in a high average power laser is introduced. Such an invention, as disclosed herein, uses diffraction gratings to increase gain, stored energy density, and pumping efficiency of solid-state laser gain media, such as, but not limited to rods, disks and slabs. By coupling predetermined gratings to solid-state gain media, such as crystal or ceramic laser gain media, ASE and parasitic oscillation modes can be effectively suppressed.

Erlandson, Alvin C. (Livermore, CA); Britten, Jerald A. (Clayton, CA)

2010-11-09T23:59:59.000Z

33

Fabrication and characterization of the source grating for visibility improvement of neutron phase imaging with gratings  

SciTech Connect (OSTI)

The fabrication of gratings including metal deposition processes for highly neutron absorbing lines is a critical issue to achieve a good visibility of the grating-based phase imaging system. The source grating for a neutron Talbot-Lau interferometer is an array of Gadolinium (Gd) structures that are generally made by sputtering, photo-lithography, and chemical wet etching. However, it is very challenging to fabricate a Gd structure with sufficient neutron attenuation of approximately more than 20 {mu}m using a conventional metal deposition method because of the slow Gd deposition rate, film stress, high material cost, and so on. In this article, we fabricated the source gratings for neutron Talbot-Lau interferometers by filling the silicon structure with Gadox particles. The new fabrication method allowed us a very stable and efficient way to achieve a much higher Gadox filled structure than a Gd film structure, and is even more suitable for thermal polychromatic neutrons, which are more difficult to stop than cold neutrons. The newly fabricated source gratings were tested at the polychromatic thermal neutron grating interferometer system of HANARO at the Korea Atomic Energy Research Institute, and the visibilities and images from the neutron phase imaging system with the new source gratings were compared with those fabricated by a Gd deposition method.

Kim, Jongyul [Neutron Science Division, Korea Atomic Energy Research Institute, Daejeon 305-353 (Korea, Republic of); Nuclear and Quantum Engineering Department, Korea Advanced Institute of Science and Technology, Daejeon 305-701 (Korea, Republic of); Lee, Kye Hong; Lim, Chang Hwy; Kim, Taejoo [Neutron Science Division, Korea Atomic Energy Research Institute, Daejeon 305-353 (Korea, Republic of); Ahn, Chi Won [Nano Fusion Technology Division, National Nanofab Center, Daejeon 305-701 (Korea, Republic of); Cho, Gyuseong [Nuclear and Quantum Engineering Department, Korea Advanced Institute of Science and Technology, Daejeon 305-701 (Korea, Republic of); Lee, Seung Wook [School of Mechanical Engineering, Pusan National University, Pusan 609-735 (Korea, Republic of)

2013-06-15T23:59:59.000Z

34

Fluidized bed boiler having a segmented grate  

DOE Patents [OSTI]

A fluidized bed furnace (10) is provided having a perforate grate (9) within a housing which supports a bed of particulate material including some combustibles. The grate is divided into a plurality of segments (E2-E6, SH1-SH5, RH1-RH5), with the airflow to each segment being independently controlled. Some of the segments have evaporating surface imbedded in the particulate material above them, while other segments are below superheater surface or reheater surface. Some of the segments (E1, E7) have no surface above them, and there are ignitor combustors (32, 34) directed to fire into the segments, for fast startup of the furnace without causing damage to any heating surface.

Waryasz, Richard E. (Longmeadow, MA)

1984-01-01T23:59:59.000Z

35

Ultrafast transient grating radiation to optical image converter  

DOE Patents [OSTI]

A high sensitivity transient grating ultrafast radiation to optical image converter is based on a fixed transmission grating adjacent to a semiconductor substrate. X-rays or optical radiation passing through the fixed transmission grating is thereby modulated and produces a small periodic variation of refractive index or transient grating in the semiconductor through carrier induced refractive index shifts. An optical or infrared probe beam tuned just below the semiconductor band gap is reflected off a high reflectivity mirror on the semiconductor so that it double passes therethrough and interacts with the radiation induced phase grating therein. A small portion of the optical beam is diffracted out of the probe beam by the radiation induced transient grating to become the converted signal that is imaged onto a detector.

Stewart, Richard E; Vernon, Stephen P; Steel, Paul T; Lowry, Mark E

2014-11-04T23:59:59.000Z

36

Manipulation of plasma grating by impulsive molecular alignment  

SciTech Connect (OSTI)

We experimentally demonstrated that multiphoton-ionization-induced plasma grating in air could be precisely manipulated by impulsive molecular alignment. In the linear region, the impulsively aligned molecules modulated the diffraction efficiency of the plasma grating for a time-delayed femtosecond laser pulse. In the nonlinear region, the third harmonic generation from the plasma grating was either enhanced or suppressed by following the alignment of the molecules.

Lu, Peifen; Wu, Jian; Zeng, Heping [State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062 (China)] [State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062 (China)

2013-11-25T23:59:59.000Z

37

Imaging Spectrometer Designs Utilizing Immersed Gratings With Accessible Entrance Slit  

DOE Patents [OSTI]

A compact imaging spectrometer comprises an entrance slit, a catadioptric lens with a mirrored surface, a grating, and a detector array. The entrance slit directs light to the mirrored surface of the catadioptric lens; the mirrored surface reflects the light back through the lens to the grating. The grating receives the light from the catadioptric lens and diffracts the light to the lens away from the mirrored surface. The lens transmits the light and focuses it onto the detector array.

Chrisp, Michael P. (Danville, CA); Lerner, Scott A. (Corvallis, OR)

2006-03-21T23:59:59.000Z

38

Diffraction Gratings for High-Intensity Laser Applications  

SciTech Connect (OSTI)

The scattering of light into wavelength-dependent discrete directions (orders) by a device exhibiting a periodic modulation of a physical attribute on a spatial scale similar to the wavelength of light has been the subject of study for over 200 years. Such a device is called a diffraction grating. Practical applications of diffraction gratings, mainly for spectroscopy, have been around for over 100 years. The importance of diffraction gratings in spectroscopy for the measurement of myriad properties of matter can hardly be overestimated. Since the advent of coherent light sources (lasers) in the 1960's, applications of diffraction gratings in spectroscopy have further exploded. Lasers have opened a vast application space for gratings, and apace, gratings have enabled entirely new classes of laser systems. Excellent reviews of the history, fundamental properties, applications and manufacturing techniques of diffraction gratings up to the time of their publication can be found in the books by Hutley (1) and more recently Loewen and Popov (2). The limited scope of this chapter can hardly do justice to such a comprehensive subject, so the focus here will be narrowly limited to characteristics required for gratings suitable for high-power laser applications, and methods to fabricate them. A particular area of emphasis will be on maximally-efficient large-aperture gratings for short-pulse laser generation.

Britten, J

2008-01-23T23:59:59.000Z

39

Fiber optic security seal including plural Bragg gratings  

DOE Patents [OSTI]

An optical security system enables the integrity of a container seal to be remotely interrogated. A plurality of Bragg gratings is written holographically into the core of at least one optical fiber placed about the container seal, where each Bragg grating has a predetermined location and a known frequency for reflecting incident light. A time domain reflectometer is provided with a variable frequency light output that corresponds to the reflecting frequencies of the Bragg gratings to output a signal that is functionally related to the location and reflecting frequency of each of the Bragg gratings. 2 figs.

Forman, P.R.

1994-09-27T23:59:59.000Z

40

Fabrication and performance of blazed transmission gratings for x-ray astronomy  

E-Print Network [OSTI]

We have developed a new type of soft x-ray diffraction grating. This critical-angle transmission (CAT) grating combines the advantages of traditional transmission gratings (low mass, extremely relaxed alignment and flatness ...

Schattenburg, Mark Lee

Note: This page contains sample records for the topic "monochromator sgm gratings" 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

Energy resolved X-ray grating interferometry  

SciTech Connect (OSTI)

Although compatible with polychromatic radiation, the sensitivity in X-ray phase contrast imaging with a grating interferometer is strongly dependent on the X-ray spectrum. We used an energy resolving detector to quantitatively investigate the dependency of the noise from the spectral bandwidth and to consequently optimize the system-by selecting the best energy band matching the experimental conditions-with respect to sensitivity maximization and, eventually, dose. Further, since theoretical calculations of the spectrum are usually limited due to non-ideal conditions, an energy resolving detector accurately quantifies the spectral changes induced by the interferometer including flux reduction and beam hardening.

Thuering, T.; Stampanoni, M. [Swiss Light Source, Paul Scherrer Institut, Villigen PSI (Switzerland) [Swiss Light Source, Paul Scherrer Institut, Villigen PSI (Switzerland); Institute for Biomedical Engineering, Swiss Federal Institute of Technology, Zurich (Switzerland); Barber, W. C.; Iwanczyk, J. S. [DxRay, Inc., Northridge, California 91324 (United States)] [DxRay, Inc., Northridge, California 91324 (United States); Seo, Y.; Alhassen, F. [UCSF Physics Research Laboratory, Department of Radiology and Biomedical Imaging, University of California, San Francisco, California 94143 (United States)] [UCSF Physics Research Laboratory, Department of Radiology and Biomedical Imaging, University of California, San Francisco, California 94143 (United States)

2013-05-13T23:59:59.000Z

42

ON THE GAGE FACTOR FOR OPTICAL FIBER GRATING STRAIN GAGES  

E-Print Network [OSTI]

of grating and fiber types. KEY WORDS: Fiber-Optic Gratings, Fiber-Optic Sensors, Strain Gage Factor 1 theoretical background. Then, in Section 3, we discuss measurement methods followed by the experimental tests and results in Section 4, before concluding in Section 5. 2. THEORETICAL BACKGROUND Consider an FBG fabricated

Park, Yong-Lae

43

Compact Catadioptric Imaging Spectrometer Designs Utilizing Immersed Gratings  

DOE Patents [OSTI]

An imaging spectrometer comprising an entrance slit for directing light, a lens that receives said light and reflects said light, a grating that defracts said light back onto said lens which focuses said light, and a detector array that receives said focused light. In one embodiment the grating has rulings immersed into a germanium surface.

Lerner, Scott A. (Livermore, CA)

2006-02-28T23:59:59.000Z

44

Increase of the grating coupler bandwidth with a graphene overlay  

SciTech Connect (OSTI)

We present theoretical and experimental results that demonstrate an increase in the grating bandwidth by placing a graphene on the chip. A focusing subwavelength grating with coupling efficiency of ?4.3?dB and 1?dB bandwidth of ?60?nm was demonstrated. After a graphene sheet was transferred onto the chip, the maximum 1?dB bandwidth was increased to ?72?nm. Experimental results are consistent with the calculated graphene induced waveguide refractive index and dispersion changes, and the bandwidth improvement may be attributed to the reduction of grating dispersion. This study may be of interest for graphene-on-silicon photonic integrated circuit applications.

Cheng, Zhenzhou; Li, Zhen; Xu, Ke; Tsang, Hon Ki, E-mail: hktsang@ee.cuhk.edu.hk [Department of Electronic Engineering, The Chinese University of Hong Kong, Shatin (Hong Kong)

2014-03-17T23:59:59.000Z

45

A 6-beam combiner using superimposed volume index holographic gratings  

E-Print Network [OSTI]

In this thesis, a 6-beam combiner using multiplexed holograms in dye-doped polymer is investigated. It is realized by recording six superimposed holographic gratings, which show uniform diffraction efficiency. The coupled wave theory for N...

Yum, HoNam

2005-11-01T23:59:59.000Z

46

Grate assembly for fixed-bed coal gasifier  

DOE Patents [OSTI]

A grate assembly for a coal gasifier of a moving-bed or fixed-bed type is provided for crushing agglomerates of solid material such as clinkers, tailoring the radial distribution of reactant gases entering the gasification reaction zone, and control of the radial distribution of downwardly moving solid velocities in the gasification and combustion zone. The clinker crushing is provided by pinching clinkers between vertically oriented stationary bars and angled bars supported on the upper surface of a rotating conical grate. The distribution of the reactant gases is provided by the selective positioning of horizontally oriented passageways extending through the grate. The radial distribution of the solids is provided by mounting a vertically and generally radially extending scoop mechanism on the upper surface of the grate near the apex thereof.

Notestein, John E. (Morgantown, WV)

1993-01-01T23:59:59.000Z

47

Design of a high index contrast arrayed waveguide grating  

E-Print Network [OSTI]

Arrayed waveguide gratings (AWGs) are useful structures for the implementation of wavelength division multiplexing. The AWG consists of an input splitter, a dispersive waveguide array which creates the wavelength demultiplexing ...

Lang, Ryan N. (Ryan Nathan)

2003-01-01T23:59:59.000Z

48

Image-line voltage controlled oscillators and grating antennas  

E-Print Network [OSTI]

IMAGE-LINE VOLTAGE CONTROLLED OSCILLATORS AND GRATING ANTENNAS A Thesis by ALEXANDER MacDONALD KIRK Submitted to the Office of Graduate Studies of Texas ABM University in partial fulfillment of the requirements for the degree of MASTER... OF SCIENCE May 1991 Major Subject: Electrical Engineering IMAGE-LINE VOLTAGE CONTROLLED OSCILLATORS AND GRATING ANTENNAS A Thesis by ALEXANDER MacDONALD KIRK Approved as to style and content by: Kai Chang (Chair of Committee) Robert D. Nevels...

Kirk, Alexander MacDonald

1991-01-01T23:59:59.000Z

49

Compact Refractive Imaging Spectrometer Designs Utilizing Immersed Gratings  

DOE Patents [OSTI]

A compact imaging spectrometer comprising an entrance slit for directing light, a first means for receiving the light and focusing the light, an immersed diffraction grating that receives the light from the first means and defracts the light, a second means for receiving the light from the immersed diffraction grating and focusing the light, and an image plane that receives the light from the second means

Lerner, Scott A. (Livermore, CA); Bennett, Charles L. (Livermore, CA); Bixler, Jay V. (Oakland, CA); Kuzmenko, Paul J. (Livermore, CA); Lewis, Isabella T. (San Jose, CA)

2005-07-26T23:59:59.000Z

50

Applications of laser-induced gratings to spectroscopy and dynamics  

SciTech Connect (OSTI)

This program has traditionally emphasized two principal areas of research. The first is the spectroscopic characterization of large-amplitude motion on the ground-state potential surface of small, transient molecules. The second is the reactivity of carbonaceous clusters and its relevance to soot and fullerene formation in combustion. Motivated initially by the desire to find improved methods of obtaining stimulated emission pumping (SEP) spectra of transients, most of our recent work has centered on the use of laser-induced gratings or resonant four-wave mixing in free-jet expansions. These techniques show great promise for several chemical applications, including molecular spectroscopy and photodissociation dynamics. The author describes recent applications of two-color laser-induced grating spectroscopy (LIGS) to obtain background-free SEP spectra of transients and double resonance spectra of nonfluorescing species, and the use of photofragment transient gratings to probe photodissociation dynamics.

Rohlfing, E.A. [Sandia National Laboratories, Livermore, CA (United States)

1993-12-01T23:59:59.000Z

51

Silicon buried gratings for dielectric laser electron accelerators  

SciTech Connect (OSTI)

This paper describes design and simulations of dielectric laser electron accelerators that achieve Gigavolt-per-meter (GV/m) accelerating gradients and wide electron channels (>1??m). The accelerator design is based on a silicon buried grating structure that enables flexible phase synchronization, large electron channel fields, and low standing-wave ratio in the material. This design increases the accelerating gradients to more than double those of reported quartz grating accelerators, thereby reducing the input laser fluence by 60% for the same accelerating gradient. With a 100 fs pulsed laser, our silicon buried gratings can achieve a maximum gradient of 1.1 GV/m, indicating that these accelerators have potential for numerous electron-accelerator applications.

Chang, Chia-Ming, E-mail: cachang@alumni.stanford.edu [Bell Labs, Alcatel-Lucent, 791 Holmdel Road, Holmdel, New Jersey 07733 (United States); Solgaard, Olav [E. L. Ginzton Lab., Stanford University, Stanford, California 94305 (United States)

2014-05-05T23:59:59.000Z

52

E-Print Network 3.0 - active polynomial grating Sample Search...  

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

Europe. Von Roll is well known for their grate technology which... -3203 Grate and Boiler Technology Assessment for a New WTE Plant in the U.S. Gregory Gesell, HDR Engineering......

53

Sagittal focusing Laue monochromator  

SciTech Connect (OSTI)

An x-ray focusing device generally includes a slide pivotable about a pivot point defined at a forward end thereof, a rail unit fixed with respect to the pivotable slide, a forward crystal for focusing x-rays disposed at the forward end of the pivotable slide and a rearward crystal for focusing x-rays movably coupled to the pivotable slide and the fixed rail unit at a distance rearward from the forward crystal. The forward and rearward crystals define reciprocal angles of incidence with respect to the pivot point, wherein pivoting of the slide about the pivot point changes the incidence angles of the forward and rearward crystals while simultaneously changing the distance between the forward and rearward crystals.

Zhong; Zhong (Stony Brook, NY), Hanson; Jonathan (Wading River, NY), Hastings; Jerome (Stanford, CA), Kao; Chi-Chang (Setauket, NY), Lenhard; Anthony (Medford, NY), Siddons; David Peter (Cutchogue, NY), Zhong; Hui (Coram, NY)

2009-03-24T23:59:59.000Z

54

Recording polarization gratings with a standing spiral wave  

SciTech Connect (OSTI)

A scalable and robust methodology for writing cycloidal modulation patterns of optical axis orientation in photosensitive surface alignment layers is demonstrated. Counterpropagating circularly polarized beams, generated by reflection of the input beam from a cholesteric liquid crystal, direct local surface orientation in a photosensitive surface. Purposely introducing a slight angle between the input beam and the photosensitive surface normal introduces a grating period/orientation that is readily controlled and templated. The resulting cycloidal diffractive waveplates offer utility in technologies requiring diffraction over a broad range of angles/wavelengths. This simple methodology of forming polarization gratings offers advantages over conventional fabrication techniques.

Vernon, Jonathan P.; Tondiglia, Vincent P.; White, Timothy J.; Bunning, Timothy J. [Air Force Research Laboratory, Materials and Manufacturing Directorate, 3005 Hobson Way, Suite 1, Wright-Patterson Air Force Base, Ohio 45433 (United States)] [Air Force Research Laboratory, Materials and Manufacturing Directorate, 3005 Hobson Way, Suite 1, Wright-Patterson Air Force Base, Ohio 45433 (United States); Serak, Svetlana V.; Hakobyan, Rafik S.; Aleksanyan, Artur K.; Tabiryan, Nelson V., E-mail: nelson@beamco.com [BEAM Engineering for Advanced Measurements Company, 809 South Orlando Avenue, Suite I, Winter Park, Florida 32789 (United States)

2013-11-11T23:59:59.000Z

55

Some effects of the transverse-stability requirement on the design of a grating linac  

SciTech Connect (OSTI)

The transverse stability of the grating linac proposed by Palmer is analyzed. It is shown that an open structure such as a grating is always unstable transversely as long as it is uniform. The structure can be made stable by utilizing the strong focusing principle. This is achieved by periodically interrupting the grating shape. We analyze the strong focusing grating linac, and find that the stability requirement places a non-trivial constraint on the phase acceptance of the system.

Kim, K.J.; Kroll, N.M.

1982-04-01T23:59:59.000Z

56

Spontaneous Spatial Alignment of Polymer Cylindrical Nanodomains on Silicon Nitride Gratings  

E-Print Network [OSTI]

a simple method to align lying-down cylindrical domains of PS-b-PMMA in the trough regions of 555 nm deepSpontaneous Spatial Alignment of Polymer Cylindrical Nanodomains on Silicon Nitride Gratings Deepak to the orientation of the grating lines and essentially spans the width of the grating trough. The proposed mechanism

Sibener, Steven

57

Characterization of Electrodeposited Gold and Palladium Nanowire Gratings with Optical  

E-Print Network [OSTI]

of a photo- resist pattern on a planar substrate. With the use of a simple transmission grating geometry, up of the bulk material.1-3 For example, when used as a sensor material, the high surface-to-volume ratio

58

Merged vector gratings recorded in a photocrosslinkable polymer liquid crystal film for polarimetry  

SciTech Connect (OSTI)

A merged vector grating, which is holographically fabricated in an anisotropic medium by irradiation with interference light with intensity modulation and polarization modulation, was designed to detect the polarization of light. The merged vector grating is recorded by the interference of two elliptically polarized beams with equal intensities, parallel azimuths, equal ellipticities, and different directions of rotation. We clarified theoretically that the Stokes parameters of the incident light beam are described by the diffraction efficiency of the merged vector grating. Also, to apply this property to formation of a polarimeter without any moving parts or mechanisms, two merged vector gratings with different grating vectors were recorded in a photocrosslinkable polymer liquid crystal film by angle-multiplexed holography. By investigation of the diffraction properties of the gratings obtained, we demonstrated the applicability of the merged vector gratings for use in polarimetry.

Sasaki, Tomoyuki, E-mail: sasaki-tomoy@vos.nagaokaut.ac.jp; Wada, Takumi; Noda, Kohei; Ono, Hiroshi [Department of Electrical Engineering, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka, Niigata 940-2188 (Japan); Kawatsuki, Nobuhiro [Department of Materials Science and Chemistry, Graduate School of Engineering, University of Hyogo, 2167 Shosha, Himeji, Hyogo 671-2280 (Japan)

2014-01-14T23:59:59.000Z

59

Performance and application of a double-crystal monochromator in the energy region 800 less than or equal to h. nu. less than or equal to 4500 eV  

SciTech Connect (OSTI)

The performance and application of an ultra-high-vacuum compatible constant-deviation double-crystal monochromator (JUMBO) in operation at SSRL is demonstrated. The monochromator can be operated with any of four pairs of crystals interchangeable in situ. An electronic-maximum-search feedback loop optimizes the intensity of the spatially fixed outgoing beam as the photon energy is scanned. The monochromatic beam is focussed (approx. 1.5 mm x 5 mm) onto the sample by a toroidal mirror. Monochromator crystals of beryl(10 anti 10), InSb(111) and Ge(111) have been tested in the energy regions 800 to 1540 eV, 1690 to 4000 eV and 1930 to 4500 eV, respectively. The performance of these crystals with regard to the resolution, the intensity, the level of scattered light, and the contribution of higher orders have been determined. Various effects arising from a radiation-induced temperature gradient in the monochromator crystals are discussed.

Hussain, Z.; Umbach, E.; Shirley, D.A.; Stoehr, V.; Feldhaus, J.

1981-07-01T23:59:59.000Z

60

Annular gap solitons in Kerr media with circular gratings  

SciTech Connect (OSTI)

We introduce standing-light patterns trapped in a Bragg grating written along the radial direction in a self-focusing (SF) or self-defocusing (SDF) optical medium. Unlike previously studied axisymmetric settings that deal with the axial propagation, we consider the propagation of light in the radial directions (outward and inward), which may give rise to annular gap solitons (AGSs), supported by the circular grating. An estimate for the threshold of the modulational instability of the AGS against azimuthal perturbations in the SF medium is obtained analytically, and verified by direct simulations. In the SDF model, stable annular and dipole solitons are found in a numerical form, while multipole patterns and vortex rings are unstable. Similar solitons are possible in the Bose-Einstein condensate.

Scheuer, Jacob [School of Electrical Engineering, Tel-Aviv University, Tel Aviv 69978 (Israel); Center for Nanoscience and Nanotechnology, Tel-Aviv University, Tel Aviv 69978 (Israel); Malomed, Boris [School of Electrical Engineering, Tel-Aviv University, Tel Aviv 69978 (Israel)

2007-06-15T23:59:59.000Z

Note: This page contains sample records for the topic "monochromator sgm gratings" 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

Phase-shifting point diffraction interferometer grating designs  

DOE Patents [OSTI]

In a phase-shifting point diffraction interferometer, by sending the zeroth-order diffraction to the reference pinhole of the mask and the first-order diffraction to the test beam window of the mask, the test and reference beam intensities can be balanced and the fringe contrast improved. Additionally, using a duty cycle of the diffraction grating other than 50%, the fringe contrast can also be improved.

Naulleau, Patrick (Oakland, CA); Goldberg, Kenneth Alan (Berkeley, CA); Tejnil, Edita (San Carlos, CA)

2001-01-01T23:59:59.000Z

62

296 J. Opt. Soc. Am. A/Vol. 13, No. 2/February 1996 T. Erdogan and J. E. Sipe Tilted fiber phase gratings  

E-Print Network [OSTI]

optical-fiber phase grating. Numerical predictions of the effects of grating tilt on the spectral spectra of strong gratings written by ultraviolet irradiation of deuterium- sensitized fiber with grating and the experimental results. © 1996 Optical Society of America 1. INTRODUCTION The fiber phase grating written

Sipe,J. E.

63

Echelle grating multi-order imaging spectrometer utilizing a catadioptric lens  

DOE Patents [OSTI]

A cryogenically cooled imaging spectrometer that includes a spectrometer housing having a first side and a second side opposite the first side. An entrance slit is on the first side of the spectrometer housing and directs light to a cross-disperser grating. An echelle immersions grating and a catadioptric lens are positioned in the housing to receive the light. A cryogenically cooled detector is located in the housing on the second side of the spectrometer housing. Light from the entrance slit is directed to the cross-disperser grating. The light is directed from the cross-disperser grating to the echelle immersions grating. The light is directed from the echelle immersions grating to the cryogenically cooled detector on the second side of the spectrometer housing.

Chrisp, Michael P; Bowers, Joel M

2014-05-27T23:59:59.000Z

64

Apparatus comprising a tunable nanomechanical near-field grating and method for controlling far-field emission  

DOE Patents [OSTI]

A tunable nanomechanical near-field grating is disclosed which is capable of varying the intensity of a diffraction mode of an optical output signal. The tunable nanomechanical near-field grating includes two sub-gratings each having line-elements with width and thickness less than the operating wavelength of light with which the grating interacts. Lateral apertures in the two sub-gratings are formed from the space between one line-element of the first sub-grating and at least one line-element of the second sub-grating. One of the sub-gratings is capable of motion such that at least one of aperture width and aperture depth changes, causing a perturbation to the near-field intensity distribution of the tunable nanomechanical near-field grating and a corresponding change to the far-field emission of thereof.

Carr, Dustin Wade (Albuquerque, NM); Bogart, Gregory Robert (Corrales, NM)

2007-02-06T23:59:59.000Z

65

Compact Reflective Imaging Spectrometer Design Utilizing An Immersed Grating And Anamorphic Mirror  

DOE Patents [OSTI]

A compact imaging spectrometer comprising an entrance slit, an anamorphic mirror, a grating, and a detector array. The entrance slit directs light to the anamorphic mirror. The anamorphic mirror receives the light and directs the light to the grating. The grating receives the light from the anamorphic mirror and defracts the light back onto the anamorphic mirror. The anamorphic mirror focuses the light onto a detector array.

Lerner, Scott A. (Corvalis, OR)

2006-01-10T23:59:59.000Z

66

Reflectivity of linear and nonlinear gamma radiated apodized chirped Bragg grating under ocean  

SciTech Connect (OSTI)

In this paper, the effect Co{sup 60} gamma radiation is investigated on the effective refractive index of apodized chirped Bragg grating. Nine apodization profiles are considered. Comparison between the reflectivity of the gamma radiated and non radiated fiber Bragg grating has been carried out. The electric field of signals propagating through the apodized chirped fiber Bragg grating (ACFBG) is first calculated from which, new values for the refractive index are determined. The nonlinear effects appear on the ACFBG reflectivity. The effect of nonlinearity and undersea temperature and pressure on the grating is also studied.

Hamdalla, Taymour A. [Faculty of Science, Alexandria University, Alexandria (Egypt); Faculty of Science, Tabuk University, Tabuk (Saudi Arabia)

2012-09-06T23:59:59.000Z

67

E-Print Network 3.0 - advanced bragg gratings Sample Search Results  

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

Bragg grating in the cavity... . Hellstrm, V. Pasiskevicius, and F. Laurell, "Widely tunable Yb:KYW laser with a volume Bragg ... Source: Van Stryland, Eric - School of Optics...

68

Durable silver thin film coating for diffraction gratings  

DOE Patents [OSTI]

A durable silver film thin film coated non-planar optical element has been developed to replace Gold as a material for fabricating such devices. Such a coating and resultant optical element has an increased efficiency and is resistant to tarnishing, can be easily stripped and re-deposited without modifying underlying grating structure, improves the throughput and power loading of short pulse compressor designs for ultra-fast laser systems, and can be utilized in variety of optical and spectrophotometric systems, particularly high-end spectrometers that require maximized efficiency.

Wolfe, Jesse D. (Discovery Bay, CA); Britten, Jerald A. (Oakley, CA); Komashko, Aleksey M. (San Diego, CA)

2006-05-30T23:59:59.000Z

69

Sandia National Laboratories: Fiber-optic Bragg grating sensor  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the1 -theErik Spoerke SSLS Exhibit at Explora Museum OnFactFiber-optic Bragg grating

70

998 JOURNAL OF MICROELECTROMECHANICAL SYSTEMS, VOL. 13, NO. 6, DECEMBER 2004 Analog Piezoelectric-Driven Tunable Gratings  

E-Print Network [OSTI]

actuation, as predicted by device modeling. The actuators demonstrate a piezo- electric 31 coefficient as "digital": for example, the Polychromator [1], the Grating Light Valve [2], the MEMS Compound Grating [3

Kim, Sang-Gook

71

Analysis of Nitro-Polycyclic Aromatic Hydrocarbons in Conventional Diesel and Fischer--Tropsch Diesel Fuel Emissions Using Electron Monochromator-Mass Spectrometry  

SciTech Connect (OSTI)

The presence of nitro-polycyclic aromatic hydrocarbons (NPAHs) in diesel fuel emissions has been studied for a number of years predominantly because of their contribution to the overall health and environmental risks associated with these emissions. Electron monochromator-mass spectrometry (EM-MS) is a highly selective and sensitive method for detection of NPAHs in complex matrixes, such as diesel emissions. Here, EM-MS was used to compare the levels of NPAHs in fuel emissions from conventional (petroleum) diesel, ultra-low sulfur/low-aromatic content diesel, Fischer-Tropsch synthetic diesel, and conventional diesel/synthetic diesel blend. The largest quantities of NPAHs were detected in the conventional diesel fuel emissions, while the ultra-low sulfur diesel and synthetic diesel fuel demonstrated a more than 50% reduction of NPAH quantities when compared to the conventional diesel fuel emissions. The emissions from the blend of conventional diesel with 30% synthetic diesel fuel also demonstrated a more than 30% reduction of the NPAH content when compared to the conventional diesel fuel emissions. In addition, a correlation was made between the aromatic content of the different fuel types and NPAH quantities and between the nitrogen oxides emissions from the different fuel types and NPAH quantities. The EM-MS system demonstrated high selectivity and sensitivity for detection of the NPAHs in the emissions with minimal sample cleanup required.

Havey, C. D.; McCormick, R. L.; Hayes, R. R.; Dane, A. J.; Voorhees, K. J.

2006-01-01T23:59:59.000Z

72

Fiber Bragg grating inscription by high-intensity femtosecond UV laser light: comparison  

E-Print Network [OSTI]

Fiber Bragg grating inscription by high-intensity femtosecond UV laser light: comparison with other 264-nm laser light and a phase mask technique, Bragg grating inscription in a range of different, that result in a significant photosensitivity enhancement of the in- vestigated fibers in comparison

Nikogosyan, David N.

73

COS/HST FUV Grating Shipping Container Handling Procedure Date: November 30, 1999  

E-Print Network [OSTI]

COS/HST FUV Grating Shipping Container Handling Procedure Date: November 30, 1999 Document Number University of Colorado Campus Box 593 Boulder, Colorado 80309 #12;REVISIONS Letter ECO No. Description Check. Wilkinson 11-30-99 The Center for Astrophysics and Space Astronomy Reviewed: COS/HST FUV Grating Shipping

Colorado at Boulder, University of

74

Slow light with flat or offset band edges in few-mode fiber with two gratings  

E-Print Network [OSTI]

, C. J. Handmer2, C. Martijn de Sterke2 and M. J. Steel3 1 ARC Center of Excellence for Ultrahigh waveguides with dual Bragg gratings," Electron. Lett. 38, 1049­1051 (2002). 10. T. Erdogan and J. E. Sipe, "Tilted fiber phase gratings," J. Opt. Soc. Am. A 13, 296­313 (1996). 11. S. K. Case, "Coupled-wave theory

75

A simple scanning spectrometer based on a stretchable elastomeric reflective grating  

SciTech Connect (OSTI)

We report a scanning optical spectrometer based on the use of a stretchable elastomeric reflective grating. The grating is obtained by supersonic cluster beam implantation of silver nanoparticles on polydimethylsiloxane previously grooved by molding to create a replica of a commercial digital versatile disk grating. The use of a stretchable grating allows the spectrometer spanning the whole optical wavelength range by solely extending the diffraction element by more than 100% of its original dimensions. The stretchable reflective optical grating shows excellent performances and stability upon thousands of stretching cycles. The use of this elastomeric element makes the optical layout and the mechanics of the spectrometer extremely simple and advantageous for those applications where spectral resolution is not a major requirement. As a proof of principle, we present the absorption spectrum of Rhodamine B in solution obtained by our spectrometer and compared to commercial instruments.

Ghisleri, C.; Milani, P., E-mail: paolo.milani@mi.infn.it [CIMAINA and Dipartimento di Fisica, Università di Milano, via Celoria 16, 20133 Milano (Italy); WISE srl, Piazza Duse 2, 20122 Milano (Italy); Potenza, M. A. C.; Bellacicca, A. [CIMAINA and Dipartimento di Fisica, Università di Milano, via Celoria 16, 20133 Milano (Italy); Ravagnan, L. [WISE srl, Piazza Duse 2, 20122 Milano (Italy)

2014-02-10T23:59:59.000Z

76

March 1, 2005 / Vol. 30, No. 5 / OPTICS LETTERS 501 Photoinduced grating formation in azo-dye-labeled  

E-Print Network [OSTI]

March 1, 2005 / Vol. 30, No. 5 / OPTICS LETTERS 501 Photoinduced grating formation in azo-dye, Davis, California 95616 Received September 13, 2004 Holographic gratings are recorded in azo-dye what we believe to be the first study of holographic gratings in azo-dye nitroben- zoxazole

Parikh, Atul N.

77

808 OPTICS LETTERS / Vol. 18, No. 10 / May 15, 1993 Photowritten gratings in ion-exchanged glass waveguides  

E-Print Network [OSTI]

gratings line by line. Gratings have been optically written in photo- sensitive fibers. Line808 OPTICS LETTERS / Vol. 18, No. 10 / May 15, 1993 Photowritten gratings in ion-exchanged glass defectcentered at 330 am,which was created by y-ray irradiation of the glass. The bleaching was accomplished

Winick, Kim

78

High efficiency multilayer blazed gratings for EUV and soft X-rays: Recent developments  

SciTech Connect (OSTI)

Multilayer coated blazed gratings with high groove density are the best candidates for use in high resolution EUV and soft x-ray spectroscopy. Theoretical analysis shows that such a grating can be potentially optimized for high dispersion and spectral resolution in a desired high diffraction order without significant loss of diffraction efficiency. In order to realize this potential, the grating fabrication process should provide a perfect triangular groove profile and an extremely smooth surface of the blazed facets. Here we report on recent progress achieved at the Advanced Light Source (ALS) in fabrication of high quality multilayer coated blazed gratings. The blazed gratings were fabricated using scanning beam interference lithography followed by wet anisotropic etching of silicon. A 200 nm period grating coated with a Mo/Si multilayer composed with 30 bi-layers demonstrated an absolute efficiency of 37.6percent in the 3rd diffraction order at 13.6 nm wavelength. The groove profile of the grating was thoroughly characterized with atomic force microscopy before and after the multilayer deposition. The obtained metrology data were used for simulation of the grating efficiency with the vector electromagnetic PCGrate-6.1 code. The simulations showed that smoothing of the grating profile during the multilayer deposition is the main reason for efficiency losses compared to the theoretical maximum. Investigation of the grating with cross-sectional transmission electron microscopy revealed a complex evolution of the groove profile in the course of the multilayer deposition. Impact of the shadowing and smoothing processes on growth of the multilayer on the surface of the sawtooth substrate is discussed.

Voronov, Dmitriy; Ahn, Minseung; Anderson, Erik; Cambie, Rossana; Chang, Chih-Hao; Goray, Leonid; Gullikson, Eric; Heilmann, Ralf; Salmassi, Farhad; Schattenburg, Mark; Warwick, Tony; Yashchuk, Valeriy; Padmore, Howard

2011-07-26T23:59:59.000Z

79

Diamond-machined ZnSe immersion grating for NIR high-resolution spectroscopy  

SciTech Connect (OSTI)

ZnSe immersion gratings (n {approx} 2.45) provide the possibility of high-resolution spectroscopy for the near-infrared (NIR) region. Since ZnSe has a lower internal attenuation than other NIR materials, it is most suitable for immersion grating, particularly in short NIR region (0.8-1.4 {micro}m). We are developing an extremely high-resolution spectrograph with {lambda}/{Delta}{lambda} = 100,000, WINERED, customized for the short NIR region, using ZnSe (or ZnS) immersion grating. However, it had been very difficult to make fine grooves on ZnSe substrate with a small pitch of less than 50 {micro}m because ZnSe is a soft/brittle material. We have overcome this problem and successfully machined sharp grooves with fine pitch on ZnSe substrates by nano precision fly-cutting technique at LLNL. The optical testing of the sample grating with HeNe laser shows an excellent performance: the relative efficiency more than 87.4 % at 0.633 {micro}m for a classical grating configuration. The diffraction efficiency when used as an immersion grating is estimated to be more than 65 % at 1 {micro}m. Following this progress, we are about to start machining a grating on a large ZnSe prism with an entrance aperture of 23mm x 50mm and the blaze angle of 70{sup o}.

Ikeda, Y; Kobayashi, N; Kuzmenko, P J; Little, S L; Yasui, C; Kondo, S; Minami, A; Motohara, K

2008-07-25T23:59:59.000Z

80

Nanomechanical near-field grating apparatus and acceleration sensor formed therefrom  

DOE Patents [OSTI]

A nanomechanical near-field grating device is disclosed which includes two sub-gratings vertically spaced by a distance less than or equal to an operating wavelength. Each sub-grating includes a plurality of line-elements spaced apart by a distance less than or equal to the operating wavelength. A light source (e.g., a VCSEL or LED) can provide light at the operating wavelength for operation of the device. The device can operate as an active grating, with the intensity of a reflected or transmitted portion of the light varying as the relative positions of the sub-gratings are controlled by an actuator. The device can also operate as a passive grating, with the relative positions of the sub-gratings changing in response to an environmentally-induced force due to acceleration, impact, shock, vibration, gravity, etc. Since the device can be adapted to sense an acceleration that is directed laterally or vertically, a plurality of devices can be located on a common substrate to form a multi-axis acceleration sensor.

Carr, Dustin Wade (Albuquerque, NM); Bogart, Gregory Robert (Corrales, NM); Keeler, Bianca E. N. (Albuquerque, NM)

2008-03-04T23:59:59.000Z

Note: This page contains sample records for the topic "monochromator sgm gratings" 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

Improvement of Laser Damage Resistance and Diffraction Efficiency of Multilayer Dielectric Diffraction Gratings by HF-Etchback Linewidth Tailoring  

SciTech Connect (OSTI)

Multilayer dielectric (MLD) diffraction gratings for Petawatt-class laser systems possess unique laser damage characteristics. Details of the shape of the grating lines and the concentration of absorbing impurities on the surface of the grating structures both have strong effects on laser damage threshold. It is known that electric field enhancement in the solid material comprising the grating lines varies directly with the linewidth and inversely with the line height for equivalent diffraction efficiency. Here, they present an overview of laser damage characteristics of MLD gratings, and describe a process for post-processing ion-beam etched grating lines using very dilute buffered hydrofluoric acid solutions. This process acts simultaneously to reduce grating linewidth and remove surface contaminants, thereby improving laser damage thresholds through two pathways.

Nguyen, H T; Larson, C C; Britten, J A

2010-10-28T23:59:59.000Z

82

Spatial Filter with Volume Gratings for High-peak-power Multistage Laser Amplifiers  

E-Print Network [OSTI]

The regular spatial filters comprised of lens and pinhole are essential component in high power laser systems, such as lasers for inertial confinement fusion, nonlinear optical technology and directed-energy weapon. On the other hand the pinhole is treated as a bottleneck of high power laser due to harmful plasma created by the focusing beam. In this paper we present a spatial filter based on angular selectivity of Bragg diffraction grating to avoid the harmful focusing effect in the traditional pinhole filter. A spatial filter consisted of volume phase gratings in two-pass amplifier cavity were reported. Two-dimensional filter was proposed by using single Pi-phase-shifted Bragg grating, numerical simulation results shown that its angular spectrum bandwidth can be less than 160urad. The angular selectivity of photo-thermo-refractive glass and RUGATE film filters, construction stability, thermal stability and the effects of misalignments of gratings on the diffraction efficiencies under high-pulse-energy laser...

Tan, Yi-zhou; Zheng, Guang-wei; Shen, Ben-jian; Pan, Heng-yue; Li, Liu

2012-01-01T23:59:59.000Z

83

Design and fabrication of highly efficient electrooptic modulators using bragg grating reflectors  

E-Print Network [OSTI]

-directional coupling that includes an attenuation coefficient. The Bragg grating spectral characteristics are exploited to fabricate distributed Bragg feedback modulators (DBFM) and Bragg reflector Fabry-Perot modulators (BFPM). The sharp cut-off in transmission...

Kim, Ryoung-Han

2006-04-12T23:59:59.000Z

84

System and technique for characterizing fluids using ultrasonic diffraction grating spectroscopy  

DOE Patents [OSTI]

A system for determining property of multiphase fluids based on ultrasonic diffraction grating spectroscopy includes a diffraction grating on a solid in contact with the fluid. An interrogation device delivers ultrasound through the solid and a captures a reflection spectrum from the diffraction grating. The reflection spectrum exhibits peaks whose relative size depends on the properties of the various phases of the multiphase fluid. For example, for particles in a liquid, the peaks exhibit dependence on the particle size and the particle volume fraction. Where the exact relationship is know know a priori, data from different peaks of the same reflection spectrum or data from the peaks of different spectra obtained from different diffraction gratings can be used to resolve the size and volume fraction.

Greenwood, Margaret S. (Richland, WA)

2008-07-08T23:59:59.000Z

85

Switchable gratings by spatially periodic alignment of liquid crystals via patterned photopolymerization  

E-Print Network [OSTI]

of Technology, Atlanta, Georgia 30332 Mohan Srinivasarao School of Polymer, Textile and Fiber Engineering, School of Chemistry and Biochemistry, Center for Advanced Research on Optical Microscopy, Georgia electrically swit- chable diffraction gratings. UV irradiation through a photomask of two comonomers

Srinivasarao, Mohan

86

Point source in a phononic grating: stop bands give rise to phonon-focusing caustics  

E-Print Network [OSTI]

We use locally-excited gigahertz surface phonon wavepackets in microscopic line structures of different pitches to reveal profound anisotropy in the radiation pattern of a point source in a grating. Time-domain data obtained ...

Maznev, Alex

87

Coupling of lateral grating displacement to the output ports of a diffractive Fabry-Perot cavity  

E-Print Network [OSTI]

Diffraction gratings have been proposed as core elements in future laser-interferometric gravitational-wave detectors. In this paper, we use a steady-state technique to derive coupling of lateral grating displacement to the output ports of a diffractive Fabry-Perot cavity. By introducing a signal to noise ratio (SNR) for each of the three cavity output ports the magnitude of the noise sidebands originating from lateral grating displacement are compared to the magnitude of a potential gravitational wave signal. For the example of a 3km long Fabry-Perot cavity featuring parameters similar to the planned Advanced Virgo instrument, we found that the forward-reflecting grating port offers the highest SNR at low frequencies. Furthermore, for this example suspension requirements for lateral isolation were computed, and a factor of twenty relaxation at a frequency of 10Hz can be gained over the transmitted port by observing the forward-reflected port.

J. Hallam; S. Chelkowski; A. Freise; S. Hild; B. Barr; K. A. Strain; O. Burmeister; R. Schnabel

2009-05-05T23:59:59.000Z

88

Twenty-channel grating polychromator diagnostic system for electron cyclotron emission measurement in JT-60  

SciTech Connect (OSTI)

A twenty-channel grating polychromator diagnostic system has been built to measure the temporal evolution of local electron temperatures in JT-60. A cross Czerny--Turner diffraction grating spectrometer is utilized for the measurement of second-harmonic electron cyclotron emission with extraordinary modes in the range 85--300 GHz, in which a grating plate grooved on both faces with different grating periods is applied effectively to yield a wide coverage for the toroidal fields. The grating angle is automatically set up by control of a stepping motor according to the relation of the grating equation. The diffracted light is detected by 20 indium-antimonide hot-electron bolometers cooled at 4.3 K in a modified Solvay cycle cryogenic refrigerator. A typical resolving power of the instrument was measured to be {lambda}/{Delta}{lambda}{approximately}130, providing a spatial resolution of 2.3 cm at the plasma center. The transmission line over {approximately}38 m long is composed of oversized {ital S}-band waveguides. The total transmissivity of this system is estimated to be {approximately}0.01.

Ishida, S.; Nagashima, A.; Sato, M.; Isei, N.; Matoba, T. (Naka Fusion Research Establishment, Japan Atomic Energy Research Institute, Naka-gun, Naka-machi, Ibaraki-ken (Japan))

1990-10-01T23:59:59.000Z

89

Experimental observation of acoustic sub-harmonic diffraction by a grating  

SciTech Connect (OSTI)

A diffraction grating is a spatial filter causing sound waves or optical waves to reflect in directions determined by the frequency of the waves and the period of the grating. The classical grating equation is the governing principle that has successfully described the diffraction phenomena caused by gratings. However, in this work, we show experimental observation of the so-called sub-harmonic diffraction in acoustics that cannot be explained by the classical grating equation. Experiments indicate two physical phenomena causing the effect: internal scattering effects within the corrugation causing a phase shift and nonlinear acoustic effects generating new frequencies. This discovery expands our current understanding of the diffraction phenomenon, and it also makes it possible to better design spatial diffraction spectra, such as a rainbow effect in optics with a more complicated color spectrum than a traditional rainbow. The discovery reveals also a possibly new technique to study nonlinear acoustics by exploitation of the natural spatial filtering effect inherent to an acoustic diffraction grating.

Liu, Jingfei, E-mail: benjamin.jf.liu@gatech.edu; Declercq, Nico F., E-mail: declercqdepatin@gatech.edu [Laboratory for Ultrasonic Nondestructive Evaluation “LUNE,” Georgia Tech Lorraine, Georgia Tech-CNRS UMI2958, Georgia Institute of Technology, 2, rue Marconi, Metz 57070 (France)

2014-06-28T23:59:59.000Z

90

Exposure Time Calculator for Immersion Grating Infrared Spectrograph: IGRINS  

E-Print Network [OSTI]

We present an exposure-time calculator (ETC) for the Immersion Grating Infrared Spectrograph (IGRINS). The signal and noise values are calculated by taking into account the telluric background emission and absorption, the emission and transmission of the telescope and instrument optics, and the dark current and read noise of the infrared detector arrays. For the atmospheric transmission, we apply models based on the amount of precipitable water vapor along the line of sight to the target. The ETC produces the expected signal-to-noise ratio (S/N) for each resolution element, given the exposure-time and number of exposures. In this paper, we compare the simulated continuum S/N for the early-type star HD 124683 and the late-type star GSS 32, and the simulated emission line S/N for the H2 rovibrational transitions from the Iris Nebula NGC 7023 with the observed IGRINS spectra. The simulated S/N from the ETC is overestimate by 10 - 15 % for the sample continuum targets.

Le, Huynh Anh N; Jaffe, Daniel T; Lee, Jae-Joon; Im, Myungshin; Kaplan, Kyle; Seifahrt, Andreas

2015-01-01T23:59:59.000Z

91

Active resonant subwavelength grating for scannerless range imaging sensors.  

SciTech Connect (OSTI)

In this late-start LDRD, we will present a design for a wavelength-agile, high-speed modulator that enables a long-term vision for the THz Scannerless Range Imaging (SRI) sensor. It takes the place of the currently-utilized SRI micro-channel plate which is limited to photocathode sensitive wavelengths (primarily in the visible and near-IR regimes). Two of Sandia's successful technologies--subwavelength diffractive optics and THz sources and detectors--are poised to extend the capabilities of the SRI sensor. The goal is to drastically broaden the SRI's sensing waveband--all the way to the THz regime--so the sensor can see through image-obscuring, scattering environments like smoke and dust. Surface properties, such as reflectivity, emissivity, and scattering roughness, vary greatly with the illuminating wavelength. Thus, objects that are difficult to image at the SRI sensor's present near-IR wavelengths may be imaged more easily at the considerably longer THz wavelengths (0.1 to 1mm). The proposed component is an active Resonant Subwavelength Grating (RSG). Sandia invested considerable effort on a passive RSG two years ago, which resulted in a highly-efficient (reflectivity greater than gold), wavelength-specific reflector. For this late-start LDRD proposal, we will transform the passive RSG design into an active laser-line reflector.

Kemme, Shanalyn A.; Nellums, Robert O.; Boye, Robert R.; Peters, David William

2006-11-01T23:59:59.000Z

92

Improved algorithm for processing grating-based phase contrast interferometry image sets  

SciTech Connect (OSTI)

Grating-based X-ray and neutron interferometry tomography using phase-stepping methods generates large data sets. An improved algorithm is presented for solving for the parameters to calculate transmissions, differential phase contrast, and dark-field images. The method takes advantage of the vectorization inherent in high-level languages such as Mathematica and MATLAB and can solve a 16 × 1k × 1k data set in less than a second. In addition, the algorithm can function with partial data sets. This is demonstrated with processing of a 16-step grating data set with partial use of the original data chosen without any restriction. Also, we have calculated the reduced chi-square for the fit and notice the effect of grating support structural elements upon the differential phase contrast image and have explored expanded basis set representations to mitigate the impact.

Marathe, Shashidhara, E-mail: marathe@aps.anl.gov; Assoufid, Lahsen, E-mail: assoufid@aps.anl.gov; Xiao, Xianghui, E-mail: xhxiao@aps.anl.gov [Advanced Photon Source, Argonne National Laboratory, 9700 S. Cass Ave., Argonne, Illinois 60439 (United States)] [Advanced Photon Source, Argonne National Laboratory, 9700 S. Cass Ave., Argonne, Illinois 60439 (United States); Ham, Kyungmin, E-mail: kham1@lsu.edu [CAMD, LSU, Baton Rouge, Louisiana 70806 (United States)] [CAMD, LSU, Baton Rouge, Louisiana 70806 (United States); Johnson, Warren W., E-mail: johnson@ligo.phys.lsu.edu [Department of Physics and Astronomy, LSU, Baton Rouge, Louisiana 70803 (United States); Butler, Leslie G., E-mail: lbutler@lsu.edu [Department of Chemistry, LSU, Baton Rouge, Louisiana 70803 (United States)

2014-01-15T23:59:59.000Z

93

A Grateful Dead Analysis: The Relationship Between Concert and Listening Behavior  

E-Print Network [OSTI]

The Grateful Dead were an American band that was born out of the San Francisco, California psychedelic movement of the 1960s. The band played music together from 1965 to 1995 and is well known for concert performances containing extended improvisations and long and unique set lists. This article presents a comparative analysis between 1,590 of the Grateful Dead's concert set lists from 1972 to 1995 and 2,616,990 last.fm Grateful Dead listening events from August 2005 to October 2007. While there is a strong correlation between how songs were played in concert and how they are listened to by last.fm members, the outlying songs in this trend identify interesting aspects of the band and their fans 10 years after the band's dissolution.

Marko A. Rodriguez; Vadas Gintautas; Alberto Pepe

2008-07-15T23:59:59.000Z

94

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

E-Print Network [OSTI]

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

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

2013-01-01T23:59:59.000Z

95

2568 JOURNAL OF LIGHTWAVE TECHNOLOGY, VOL. 23, NO. 8, AUGUST 2005 Long-Period Fiber Grating Fabrication by  

E-Print Network [OSTI]

fiber). It was found that the grating strength in the case of SMF-28 fiber, irradiated with high. The thermal studies of the recorded gratings were also conducted. Index Terms--Laser excitation, optical fiber devices, optical fiber filters, ultraviolet radiation effects. I. INTRODUCTION THOUGH long-period fiber

Nikogosyan, David N.

96

A Bragg grating on LiNbO? waveguide for velocity-matching of electrooptic modulators  

E-Print Network [OSTI]

.07 []m period grating was realized on a single mode Ti:LiNbO? waveguide using a holographic process and reactive ion etching (RIE). A TiO? etching rate of about 100 [A]/min is achieved by RIE with a CHF?, Ar and He gas mixture. A 1.07 []m period, 0.23[]m...

Wang, Ruiyu

2001-01-01T23:59:59.000Z

97

anagin Forests because Carbon Matters: In grating Energy, Products, and Land  

E-Print Network [OSTI]

to the atmosphere. The value of carbon credits generated by forest carbon offset projects differs dramatically and relatively high transaction costs needed for forest carbon offsets warrant consideration of other policiesanagin Forests because Carbon Matters: In grating Energy, Products, and Land Management Policy

Fried, Jeremy S.

98

Dispersion characteristics of three-dimensional dielectric-loaded grating for terahertz Smith-Purcell radiation  

SciTech Connect (OSTI)

In this paper, a dielectric-loaded grating for Smith-Purcell device is proposed. The three-dimensional (3D) analytical theory for hot dispersion relation is obtained by using field matched method, which is solved by numerical simulations. The first and second order growth rates for the proposal model are analyzed, which is obtained by expanding hot dispersion equation at the operating point. The results show that the dispersion can be effectively weakened by introducing dielectric-loaded grating, in which the cutoff frequency is affected by the grating thickness. The dispersion curve becomes flatter and shifts towards lower frequency at the optimum grating parameters. The 3D particle-in-cell (PIC) simulation is also performed and the results are in good agreement with theoretical calculations. Comparing the first order growth rate with the second one, it reveals that the discrepancy is small when electron beam parameters are selected with small values. Otherwise, the discrepancy is large and cannot be ignored. To accurately describe the process of beam-wave interaction, the second order growth rate is necessary to apply.

Cao, Miaomiao, E-mail: mona486@yeah.net; Li, Ke, E-mail: like3714@163.com [Key Laboratory of High Power Microwave Sources and Technologies, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190 (China) [Key Laboratory of High Power Microwave Sources and Technologies, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190 (China); University of Chinese Academy of Sciences, Beijing 100049 (China); Liu, Wenxin, E-mail: lwenxin@mail.ie.ac.cn; Wang, Yong, E-mail: wangyong3845@sina.com [Key Laboratory of High Power Microwave Sources and Technologies, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190 (China)] [Key Laboratory of High Power Microwave Sources and Technologies, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190 (China)

2014-02-15T23:59:59.000Z

99

Enhanced efficiency of thin film solar cells using a shifted dual grating plasmonic structure  

E-Print Network [OSTI]

.5403) Plasmonics; (310.2790) Guided waves. References and links 1. O. Morton, "Solar energy: A new day dawning Society of America OCIS codes: (350.6050) Solar energy; (050.2770) Gratings; (310.0310) Thin films; (250? Silicon valley sunrise," Nature 443(7107), 19­22 (2006). 2. M. A. Green and S. Pillai, "Harnessing

Levy, Uriel

100

Quenched by ice: Transient grating measurements of vibronic dynamics in bromine-doped ice  

E-Print Network [OSTI]

Quenched by ice: Transient grating measurements of vibronic dynamics in bromine-doped ice I. U April 2006; published online 25 May 2006 In both water and in ice, the absorption spectra of bromine of the trapped molecule in its electronic B 3 0u state in ice. Independent of the initial excitation energy

Apkarian, V. Ara

Note: This page contains sample records for the topic "monochromator sgm gratings" 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

Liquid Resin Infusion process monitoring with superimposed Fibre Bragg Grating sensor  

E-Print Network [OSTI]

1 Liquid Resin Infusion process monitoring with superimposed Fibre Bragg Grating sensor Emmanuel Resin Infusion (LRI) , with the FBG/LPG sensor embedded in a composite part. Dielectric analysis the material and the structure. Among the various composite manufacturing processes, Liquid Resin Infusion (LRI

Paris-Sud XI, Université de

102

Municipal Solid Waste as an Energy Source by Roller-Grate Incineration  

E-Print Network [OSTI]

The Grumman/VKW (Duesseldorf) Roller-Grate System was developed specifically to mass-burn municipal solid wastes achieving efficient combustion by a rolling and mixing action of the fuel bed, and independent control of primary air and roller speed...

Karnoski, P. J.

1979-01-01T23:59:59.000Z

103

Optical Design Considerations Relevant to Reflective UV Launch Gratings for Photocathode Irradiation  

SciTech Connect (OSTI)

The characteristics of photoelectron microbunches emitted from a photocathode in response to laser irradiation determine many of the incident laser pulse requirements. RF photocathode designs based on grazing incidence of the irradiation benefit from the removal of launch optics from the electron beamline and enhanced absorption at Brewster angles. However, this also introduces two well known complexities in the laser pulse 'launch' requirements: (i) a transverse spatial anamorphism to guarantee that the projected transverse spatial profile of the irradiation is circular (in the plane of the photocathode) and (ii) a 'time slew' or tilted amplitude front on the laser pulse that is incident on the photocathode to guarantee that the temporal (longitudinal) profiles are synchronous across the entire transverse irradiation profile in the photocathode plane. A single diffraction grating can be used to fulfill these combined requirements. This reported work focuses on grating behavior only. It does not address imaging requirements associated with relayed optical transport from the grating to the photocathode. Because the grating is a highly dispersive optical element by design, the dispersive aspects of all launch requirements are important.

Bolton, Paul

2010-12-07T23:59:59.000Z

104

Two-photon photochemical long-period grating fabrication in pure-fused-silica photonic  

E-Print Network [OSTI]

fiber irradiated under similar conditions with the same grating parameters. © 2006 Optical Society of the light fluence was accomplished accord- ing to the method described earlier.10­12 The irradiated fiber fiber Gilberto Brambilla Optoelectronics Research Centre, University of Southampton, Southampton SO17 1

Nikogosyan, David N.

105

Wire-grid diffraction gratings used as polarizing beam splitter for  

E-Print Network [OSTI]

Wire-grid diffraction gratings used as polarizing beam splitter for visible light and applied of wire grid polarizers as efficient polarizing beam splitters for visible light is studied. The large of wire-grid polarizers in liquid crystal on silicon display systems is considered. © 2005 Optical Society

106

Tiled-Grating Compressor with Uncompensated Dispersion for Near-Field-Intensity Smoothing  

SciTech Connect (OSTI)

A tiled-grating compressor, in which the spatial dispersion is not completely compensated, reduces the near-field-intensity modulation caused by tiling gaps and provides near-field spatial filtering of the input laser beam, thus reducing the laser damage to the final optics.

Huang, H.; Kessler, T.J.

2007-07-02T23:59:59.000Z

107

Formation of binary phase gratings in photopolymer-liquid crystal composites by a surface-controlled anisotropic phase separation  

SciTech Connect (OSTI)

We report on formation of binary phase gratings in photopolymer-liquid crystal (PLC) composites using a surface-controlled phase separation method. The binary nature of the PLC phase gratings is produced by employing a single step photo-ablation through an amplitude photomask which precisely controls the interfacial interactions between the LC and the photopolymer on the alignment layer. A subsequent illumination of the ultraviolet light onto the whole PLC promotes an anisotropic phase separation resulting in the formation of distinct binary patterns for the PLC structure. The electrically tunable diffraction properties of the binary phase gratings are presented.

Park, Jae-Hong; Khoo, Iam Choon; Yu, Chang-Jae; Jung, Min-Sik; Lee, Sin-Doo [216 Electrical Engineering East, Pennsylvania State University, University Park, Pennsylvania 16802 (United States); School of Electrical Engineering no. 32, Seoul National University, Kwanak P.O. Box 34, Seoul 151-600 (Korea, Republic of)

2005-01-10T23:59:59.000Z

108

Fabrication of high-throughput critical-angle X-ray transmission gratings for wavelength-dispersive spectroscopy  

E-Print Network [OSTI]

The development of the critical-angle transmission (CAT) grating seeks both an order of magnitude improvement in the effective area, and a factor of three increase in the resolving power of future space-based, soft x-ray ...

Bruccoleri, Alexander Robert

2013-01-01T23:59:59.000Z

109

Design and analysis of a scanning beam interference lithography system for patterning gratings with nanometer-level distortions  

E-Print Network [OSTI]

This thesis describes the design and analysis of a system for patterning large-area gratings with nanometer level phase distortions. The novel patterning method, termed scanning beam interference lithography (SBIL), uses ...

Konkola, Paul Thomas, 1973-

2003-01-01T23:59:59.000Z

110

Mathematical Modeling and Experimental Study of Biomass Combustion in a Thermal 108 MW Grate-Fired Boiler  

E-Print Network [OSTI]

-Fired Boiler Chungen Yin,*, Lasse Rosendahl, Søren K. Kær, Sønnik Clausen, Søren L. Hvid,§ and Torben Hille, Denmark ReceiVed NoVember 16, 2007. ReVised Manuscript ReceiVed January 4, 2008 Grate boilers are widely) model for an industrial biomass-fired grate boiler, which can be used for diagnosis and optimization

Rosendahl, Lasse

111

Three-dimensional theory of Smith-Purcell free-electron laser with dielectric loaded grating  

SciTech Connect (OSTI)

A dielectric loaded rectangular grating for Smith-Purcell devices is proposed in this paper. Regarding the electron beam as a moving plasma dielectric, a three dimensional (3D) linear theory of beam-wave interaction is developed. The first and second order growth rates are calculated, which are obtained by expanding hot dispersion equation at synchronous point. The results show that the cutoff frequency is affected by grating width. The dispersion curve becomes flatter and shifts towards lower frequency by loading dielectric in grooves. The simulation results, which are obtained by a 3D particle-in-cell code, are in good agreement with theoretical calculations. Compared the first and second order growth rate, it shows that the discrepancy is large when beam parameters are selected with high values. In this case, it is necessary to apply the second order growth rate, which can accurately describe the process of beam-wave interaction.

Cao, Miaomiao, E-mail: mona486@yeah.net; Li, Ke, E-mail: like3714@163.com [Key Laboratory of High Power Microwave Sources and Technologies, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190 (China); University of Chinese Academy of Sciences, School of Electronic Science and Technology, Beijing 100049 (China); Liu, Wenxin, E-mail: lwenxin@mail.ie.ac.cn; Wang, Yong, E-mail: wangyong3845@sina.com [Key Laboratory of High Power Microwave Sources and Technologies, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190 (China)

2014-09-14T23:59:59.000Z

112

Master dye laser oscillator including a specific grating assembly for use therein  

DOE Patents [OSTI]

A dye laser oscillator for producing a tuned dye beam is disclosed herein and includes, among other components, a beam output coupling assembly, a dye cell assembly, a beam expander assembly, an etalon assembly, and a grating assembly. Each of three assemblies is vertically supported from a horizontal base so as to be readily removable from the base without interference from or interfering with the other assemblies. The particular grating assembly disclosed is specifically designed for proper optical alignment with the intended path of the dye beam to be produced and for accurate pivotal movement relative to the beam path in order to function as a coarse tuning mechanism in the production of the ultimately tuned beam.

Davin, James M. (Livermore, CA)

1992-01-01T23:59:59.000Z

113

Temporal thermal response of Type II-IR fiber Bragg gratings  

SciTech Connect (OSTI)

We use the phase mask method to investigate both experimentally and theoretically the temporal thermal response of Type II-IR fiber Bragg gratings inscribed by a femtosecond laser. A fast testing system is developed to measure the thermal response time by means of periodic CO2 laser irradiation, which creates a rapid temperature change environment. The temporal thermal response is found to be independent of the heat power and the heat direction, although the grating produced destroys the axial symmetry of the fiber. The measured values of the temporal thermal response are {approx}230 ms for heating and {approx}275 ms for cooling, which different from the simulation results obtained from a lumped system equation. The causes of such differences are investigated in detail.

Liao Changrui; Wang Dongning; Li Yuhua; Sun Tong; Grattan, Kenneth T. V.

2009-06-01T23:59:59.000Z

114

Master dye laser oscillator including a specific grating assembly for use therein  

DOE Patents [OSTI]

A dye laser oscillator for producing a tuned dye beam is disclosed herein and includes, among other components, a beam output coupling assembly, a dye cell assembly, a beam expander assembly, an etalon assembly, and a grating assembly. Each of three assemblies is vertically supported from a horizontal base so as to be readily removable from the base without interference from or interfering with the other assemblies. The particular grating assembly disclosed is specifically designed for proper optical alignment with the intended path of the dye beam to be produced and for accurate pivotal movement relative to the beam path in order to function as a coarse tuning mechanism in the production of the ultimately tuned beam. 5 figs.

Davin, J.M.

1992-09-01T23:59:59.000Z

115

Polarization-resolved sensing with tilted fiber Bragg gratings: theory and limits of detection  

E-Print Network [OSTI]

Polarization based sensing with tilted fiber Bragg grating (TFBG) sensors is analysed theoretically by two alternative approaches. The first method is based on tracking the grating transmission for two orthogonal states of linear polarized light that are extracted from the measured Jones matrix or Stokes vectors of the TFBG transmission spectra. The second method is based on the measurements along the system principle axes and polarization dependent loss (PDL) parameter, also calculated from measured data. It is shown that the frequent crossing of the Jones matrix eigenvalues as a function of wavelength leads to a non-physical interchange of the calculated principal axes; a method to remove this unwanted mathematical artefact and to restore the order of the system eigenvalues and the corresponding principal axes is provided. A comparison of the two approaches reveals that the PDL method provides a smaller standard deviation and therefore lower limit of detection in refractometric sensing. Furthermore, the pol...

Bialiayeu, Aliaksandr; Albert, Jacques

2015-01-01T23:59:59.000Z

116

Cascading metallic gratings for broadband absorption enhancement in ultrathin plasmonic solar cells  

SciTech Connect (OSTI)

The incorporation of plasmonic nanostructures in the thin-film solar cells (TFSCs) is a promising route to harvest light into the nanoscale active layer. However, the light trapping scheme based on the plasmonic effects intrinsically presents narrow-band resonant enhancement of light absorption. Here we demonstrate that by cascading metal nanogratings with different sizes atop the TFSCs, broadband absorption enhancement can be realized by simultaneously exciting multiple localized surface plasmon resonances and inducing strong coupling between the plasmonic modes and photonic modes. As a proof of concept, we demonstrate of 66.5% in the photocurrent in an ultrathin amorphous silicon TFSC with two-dimensional cascaded gratings over the reference cell without gratings.

Wen, Long; Sun, Fuhe [Key Laboratory of Nanodevices and Applications-CAS and Collaborative Innovation Center of Suzhou Nano Science and Technology, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences (CAS), Suzhou 215123 (China); Chen, Qin, E-mail: qchen2012@sinano.ac.cn [Key Laboratory of Nanodevices and Applications-CAS and Collaborative Innovation Center of Suzhou Nano Science and Technology, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences (CAS), Suzhou 215123 (China); Peking University Shenzhen SOC Key Laboratory, PKU-HKUST Shenzhen-Hong Kong Institute, Hi-Tech Industrial Park South, Shenzhen 518057 (China)

2014-04-14T23:59:59.000Z

117

An experimental study of low-frequency amplitude noise in a fibre Bragg grating laser diode  

SciTech Connect (OSTI)

We have studied the amplitude noise in a fibre Bragg grating laser diode. It has been shown that discontinuities in noise characteristics correlate with those in the power – current and spectral characteristics of the laser diode, whereas the noise characteristics of the pump source have no such discontinuities. The highest noise level has been observed at pump currents corresponding to concurrent generation of two longitudinal modes. (lasers)

Zholnerov, V S [Russian Institute of Radionavigation and Time, St.Petersburg (Russian Federation); Ivanov, A V; Kurnosov, V D; Kurnosov, K V; Romantsevich, V I; Chernov, R V [Open Joint-Stock Company M.F. Stel'makh Polyus Research Institute, Moscow (Russian Federation)

2013-09-30T23:59:59.000Z

118

The CHANDRA HETGS X-ray Grating Spectrum of Eta Car  

E-Print Network [OSTI]

Eta Car may be the most massive and luminous star in the Galaxy and is suspected to be a massive, colliding wind binary system. The CHANDRA X-ray observatory has obtained a calibrated, high-resolution X-ray spectrum of the star uncontaminated by the nearby extended soft X-ray emisssion. Our 89 ksec CHANDRA observation with the High Energy Transmission Grating Spectrometer (HETGS) shows that the hot gas near the star is non-isothermal. The temperature distribution may represent the emission on either side of the colliding wind bow shock, effectively ``resolving'' the shock. If so, the pre-shock wind velocities are ~ 700 and ~ 1800 km/s in our analysis, and these velocities may be interpreted as the terminal velocities of the winds from Eta Car and from the hidden companion star. The forbidden-to-intercombination (f/i) line ratios for the He-like ions of S, Si and Fe are large, indicating that the line forming region lies far from the stellar photosphere. The iron fluorescent line at 1.93 Angstrom, first detected by ASCA, is clearly resolved from the thermal iron line in the CHANDRA grating spectrum. The Fe fluorescent line is weaker in our CHANDRA observation than in any of the ASCA spectra. The CHANDRA observation also provides an uninterrupted high-time resolution lightcurve of the stellar X-ray emission from Eta Car and suggests that there was no significant, coherent variability during the CHANDRA observation. The Eta Car CHANDRA grating spectrum is unlike recently published X-ray grating spectra of single massive stars in significant ways and is generally consistent with colliding wind emission in a massive binary.

M. F. Corcoran; J. H. Swank; R. Petre; K. Ishibashi; K. Davidson; L. Townsley; R. Smith; S. White; R. Viotti; A. Damineli

2001-09-19T23:59:59.000Z

119

Sensitivity enhancement of grating interferometer based two-dimensional sensor arrays using two-wavelength readout  

SciTech Connect (OSTI)

Diffraction gratings integrated with microelectromechanical systems (MEMS) sensors offer displacement measurements with subnanometer sensitivity. However, the sensitivity of the interferometric readout may drop significantly based on the gap between the grating and the reference surface. A two-wavelength (2-{lambda}) readout method was previously tested using a single MEMS sensor for illustrating increased displacement measurement capability. This work demonstrates sensitivity enhancement on a sensor array with large scale parallelization ({approx}20,000 sensors). The statistical representation, which is developed to model sensitivity enhancement within a grating based sensor array, is supported by experimental results using a thermal sensor array. In the experiments, two lasers at different wavelengths (633 and 650 nm) illuminate the thermal sensor array from the backside, time-sequentially. The diffracted first order light from the array is imaged onto a single CCD camera. The target scene is reconstructed by observing the change in the first diffracted order diffraction intensity for both wavelengths. Merging of the data from two measurements with two lasers was performed by taking the larger of the two CCD measurements with respect to the reference image for each sensor. {approx}30% increase in the average sensitivity was demonstrated for a 160x120 pixel IR sensor array. Proposed architecture is also applicable to a variety of sensing applications, such as parallel biosensing and atomic force microscopy, for improved displacement measurements and enhanced sensitivity.

Ferhanoglu, Onur; Urey, Hakan

2011-07-01T23:59:59.000Z

120

Analogies between optical propagation and heat diffusion: Applications to micro-cavities, gratings and cloaks  

E-Print Network [OSTI]

A new analogy between optical propagation and heat diffusion in heterogeneous anisotropic media has been proposed recently [S. Guenneau, C. Amra, and D. Veynante, Optics Express Vol. 20, 8207-8218 (2012)]. A detailed derivation of this unconventional correspondence is presented and developed. In time harmonic regime, all thermal parameters are related to optical ones in artificial metallic media, thus making possible to use numerical codes developed for optics. Then the optical admittance formalism is extended to heat conduction in multilayered structures. The concepts of planar micro-cavities, diffraction gratings, and planar transformation optics for heat conduction are addressed. Results and limitations of the analogy are emphasized.

Amra, Claude; Zerrad, Myriam; Guenneau, Sébastien; Soriano, Gabriel; Gralak, Boris; Bellieud, Michel; Veynante, Denis; Rolland, Nathalie

2015-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "monochromator sgm gratings" 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

Enhancement of near-infrared absorption in graphene with metal gratings  

SciTech Connect (OSTI)

Graphene has been demonstrated as a good candidate for ultrafast optoelectronic devices. However, graphene is essentially transparent in the visible and near infrared with an absorptivity of 2.3%, which has largely limited its application in photon detection. This Letter demonstrates that the absorptance in a monatomic graphene layer can be greatly enhanced to nearly 70%, thanks to the localized strong electric field resulting from magnetic resonances in deep metal gratings. Furthermore, the resonance frequency is essentially not affected by the additional graphene layer. The method presented here may benefit the design of next-generation graphene-based optical and optoelectronic devices.

Zhao, B.; Zhang, Z. M., E-mail: zhuomin.zhang@me.gatech.edu [G.W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332 (United States); Zhao, J. M. [G.W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332 (United States); School of Energy Science and Engineering, Harbin Institute of Technology, Harbin (China)

2014-07-21T23:59:59.000Z

122

Simultaneous maximum-likelihood reconstruction for x-ray grating based phase-contrast tomography avoiding intermediate phase retrieval  

E-Print Network [OSTI]

Phase-wrapping artifacts, statistical image noise and the need for a minimum amount of phase steps per projection limit the practicability of x-ray grating based phase-contrast tomography, when using filtered back projection reconstruction. For conventional x-ray computed tomography, the use of statistical iterative reconstruction algorithms has successfully reduced artifacts and statistical issues. In this work, an iterative reconstruction method for grating based phase-contrast tomography is presented. The method avoids the intermediate retrieval of absorption, differential phase and dark field projections. It directly reconstructs tomographic cross sections from phase stepping projections by the use of a forward projecting imaging model and an appropriate likelihood function. The likelihood function is then maximized with an iterative algorithm. The presented method is tested with tomographic data obtained through a wave field simulation of grating based phase-contrast tomography. The reconstruction result...

Ritter, André; Durst, Jürgen; Gödel, Karl; Haas, Wilhelm; Michel, Thilo; Rieger, Jens; Weber, Thomas; Wucherer, Lukas; Anton, Gisela

2013-01-01T23:59:59.000Z

123

Large birefringence and polarization holographic gratings formed in photocross-linkable polymer liquid crystals comprising bistolane mesogenic side groups  

SciTech Connect (OSTI)

Polarization gratings with large birefringence are formed in photoreactive polymer liquid crystals with bistolane moiety and terminal cinnamic acid moiety by the use of polarized ultraviolet interference light and subsequent annealing. The polarized ultraviolet light causes the axis-selective photoreaction between the cinnamic acid groups and subsequent annealing induce the reorientation of peripheral molecules without cross-linking along the cross-linked groups. Long bistolane mesogenic moiety exhibits large birefringence in comparison with a biphenyl mesogenic moiety, the value of the induced birefringence in the bistolane mesogenic liquid crystalline (LC) polymer is strongly dependent on both the grating constant and the wavelength of the reconstruction light.

Emoto, Akira; Matsumoto, Taro; Shioda, Tatsutoshi; Ono, Hiroshi [Department of Electrical Engineering, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka, Niigata 940-2188 (Japan); Yamashita, Ayumi; Kawatsuki, Nobuhiro [Department of Materials Science and Chemistry, Graduate School of Engineering, University of Hyogo, 2167 Shosha, Himeji, Hyogo 671-2201 (Japan)

2009-10-01T23:59:59.000Z

124

Acoustic grating fringe projector for high-speed and high-precision three-dimensional shape measurements  

SciTech Connect (OSTI)

A new acoustic grating fringe projector (AGFP) was developed for high-speed and high-precision 3D measurement. A new acoustic grating fringe projection theory is also proposed to describe the optical system. The AGFP instrument can adjust the spatial phase and period of fringes with unprecedented speed and accuracy. Using rf power proportional-integral-derivative (PID) control and CCD synchronous control, we obtain fringes with fine sinusoidal characteristics and realize high-speed acquisition of image data. Using the device, we obtained a precise phase map for a 3D profile. In addition, the AGFP can work in running fringe mode, which could be applied in other measurement fields.

Yin Xuebing; Zhao Huijie; Zeng Junyu; Qu Yufu

2007-05-20T23:59:59.000Z

125

Integrated municipal solid waste treatment using a grate furnace incinerator: The Indaver case  

SciTech Connect (OSTI)

An integrated installation for treatment of municipal solid waste and comparable waste from industrial origin is described. It consists of three grate furnace lines with flue gas treatment by half-wet scrubbing followed by wet scrubbing, and an installation for wet treatment of bottom ash. It is demonstrated that this integrated installation combines high recovery of energy (40.8% net) with high materials recovery. The following fractions were obtained after wet treatment of the bottom ash: ferrous metals, non-ferrous metals, three granulate fractions with different particle sizes, and sludge. The ferrous and non-ferrous metal fractions can both be recycled as high quality raw materials; the two larger particle size particle fractions can be applied as secondary raw materials in building applications; the sand fraction can be used for applications on a landfill; and the sludge is landfilled. For all components of interest, emissions to air are below the limit values. The integrated grate furnace installation is characterised by zero wastewater discharge and high occupational safety. Moreover, with the considered installation, major pollutants, such as PCDD/PCDF, Hg and iodine-136 are to a large extent removed from the environment and concentrated in a small residual waste stream (flue gas cleaning residue), which can be landfilled after stabilisation.

Vandecasteele, C. [Department of Chemical Engineering, Katholieke Universiteit Leuven, De Croylaan 46, 3001 Leuven (Belgium)], E-mail: carlo.vandecasteele@cit.kuleuven.be; Wauters, G. [Indaver, Dijle 17a, 2800 Mechelen (Belgium); Arickx, S. [Department of Chemical Engineering, Katholieke Universiteit Leuven, De Croylaan 46, 3001 Leuven (Belgium); Jaspers, M. [Indaver, Dijle 17a, 2800 Mechelen (Belgium); Van Gerven, T. [Department of Chemical Engineering, Katholieke Universiteit Leuven, De Croylaan 46, 3001 Leuven (Belgium)

2007-07-01T23:59:59.000Z

126

Optical properties of wide single-mode strip and grating loaded channel waveguides  

SciTech Connect (OSTI)

New wide single-mode strip and grating loaded (SGL) channel waveguides made of silicon nitride on the oxide buffer layer of a planar silicon-on-insulator waveguide are studied. The central 10-lm-wide strip produces a multi-mode channel waveguide and diffraction gratings with a period 0.6 lm built on the structure edges produce mode-dependent additional losses due to radiation to the surrounding medium. The optical properties of these waveguides are discussed using the results of a three-dimensional numerical simulation by the FDTD and BPM methods. It is shown that a wide SGL waveguide is quasi-single-mode one because it has a small propagation loss ({approx} 0.3 dB cm{sup -1}) for the fundamental mode and a high (up to -20 dB cm{sup -1}) loss for the higher order modes. The new SGL waveguides are CMOS compatible and can become basic for fabricating new photonic elements, including tunable optical filters and multi-plexers based on the multireflector technology. (waveguides)

Tsarev, Andrei V [Rzhanov Institute of Semiconductor Physics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk (Russian Federation)

2009-12-31T23:59:59.000Z

127

Devices useful for vacuum ultraviolet beam characterization including a movable stage with a transmission grating and image detector  

DOE Patents [OSTI]

The invention provides for a device comprising an apparatus comprising (a) a transmission grating capable of diffracting a photon beam into a diffracted photon output, and (b) an image detector capable of detecting the diffracted photon output. The device is useful for measuring the spatial profile and diffraction pattern of a photon beam, such as a vacuum ultraviolet (VUV) beam.

Gessner, Oliver; Kornilov, Oleg A; Wilcox, Russell B

2013-10-29T23:59:59.000Z

128

July 1, 2001 / Vol. 26, No. 13 / OPTICS LETTERS 989 Waveguide grating mirror for large-area semiconductor lasers  

E-Print Network [OSTI]

was demonstrated in Ref. 7. A similar scheme with near-infrared dye was reported in Ref. 8 On a smaller scale a waveguide grating mirror that uses anomalous reflection of light associ- ated with excitation of waveguide. Anomalous reflection in the case of a lossless waveguide can approach 100% close to resonant wave- guide

Avrutsky, Ivan

129

Long-period fiber grating inscription under high-intensity 352 nm femtosecond irradiation: Three-photon absorption  

E-Print Network [OSTI]

Long-period fiber grating inscription under high-intensity 352 nm femtosecond irradiation: Three invented in the mid- 1990s [1]. They represent a periodic change of refractive index in an optical fiber.N. Nikogosyan). Optics Communications 255 (2005) 81­90 www.elsevier.com/locate/optcom #12;recording techniques

Nikogosyan, David N.

130

Efficiency enhancement in a light-emitting diode with a two-dimensional surface grating photonic crystal  

E-Print Network [OSTI]

Efficiency enhancement in a light-emitting diode with a two-dimensional surface grating photonic 21 November 2003 We demonstrate a light-emitting diode exhibiting 1.7­2.7-fold enhancement in light light emitting diode LED , the ef- ficiency is limited to several percents by a low light extrac- tion

Baba, Toshihiko

131

Volume203,number2,3 CHEMICAL PHYSICS LETTERS 19February1993 Transient grating spectroscopy of exciton sound waves  

E-Print Network [OSTI]

of exciton sound waves in dense exciton fluids Jan A. Leegwater and Shaul Mukamel Department of Chemistry to that of sound waves in an ordinary gas. A method to probe these motions using transient grating with strong pump density may disappear and reap- pear later. The physical mechanism is analogous to that of sound waves

Mukamel, Shaul

132

1966 JOURNAL OF LIGHTWAVE TECHNOLOGY, VOL. 15, NO. 10, OCTOBER 1997 Mode Conversion of Ultrafast Pulses by Grating  

E-Print Network [OSTI]

conversion of an ultrafast, ultrawide-bandwidth optical pulse propagating in a layered di- electric waveguide for an ultrafast six-cycle optical pulse over that achieved with standard uniform grating convertors. Index Terms--Dielectric waveguides, FDTD, mode conversion, mode extraction, numerical modeling, ultrafast optical pulses. I

Ziolkowski, Richard W.

133

Holographic Storage of Multiple Coherence Gratings in a Bose-Einstein Condensate Yutaka Yoshikawa,1,2,* Kazuyuki Nakayama,2  

E-Print Network [OSTI]

of the condensate, a high conversion efficiency of >70% and a long storage time of >120 s were achieved. DOI: 10Holographic Storage of Multiple Coherence Gratings in a Bose-Einstein Condensate Yutaka Yoshikawa,1 in an elongated cloud of Bose-condensed atoms. Two off-resonant write beams induce superradiant Raman scattering

Torii, Yoshio

134

Two-axis sagittal focusing monochromator  

DOE Patents [OSTI]

An x-ray focusing device and method for adjustably focusing x-rays in two orthogonal directions simultaneously. The device and method can be operated remotely using two pairs of orthogonal benders mounted on a rigid, open frame such that x-rays may pass through the opening in the frame. The added x-ray flux allows significantly higher brightness from the same x-ray source.

Haas, Edwin G; Stelmach, Christopher; Zhong, Zhong

2014-05-13T23:59:59.000Z

135

Multiple wavelength X-ray monochromators  

DOE Patents [OSTI]

An improved apparatus and method is provided for separating input x-ray radiation containing first and second x-ray wavelengths into spatially separate first and second output radiation which contain the first and second x-ray wavelengths, respectively. The apparatus includes a crystalline diffractor which includes a first set of parallel crystal planes, where each of the planes is spaced a predetermined first distance from one another. The crystalline diffractor also includes a second set of parallel crystal planes inclined at an angle with respect to the first set of crystal planes where each of the planes of the second set of parallel crystal planes is spaced a predetermined second distance from one another. In one embodiment, the crystalline diffractor is comprised of a single crystal. In a second embodiment, the crystalline diffractor is comprised of a stack of two crystals. In a third embodiment, the crystalline diffractor includes a single crystal that is bent for focusing the separate first and second output x-ray radiation wavelengths into separate focal points. 3 figs.

Steinmeyer, P.A.

1992-11-17T23:59:59.000Z

136

Field theory of a terahertz staggered double-grating arrays waveguide Cerenkov traveling wave amplifier  

SciTech Connect (OSTI)

Based on a rectilinear sheet electron beam propagating through the tunnel of a staggered double-grating arrays waveguide (SDGAW) slow-wave structure (SWS), a three dimensional field theory for describing the modes and the beam-wave interaction is presented, in which the higher order terms inside the grooves are retained. The fields' distribution and the conductivity losses are also calculated utilizing the theoretical model. With the optimized parameters of the SWS and the electron beam, a 1 THz SDGAW Cerenkov traveling wave amplifier may obtain a moderate net gain (the peak gain is 12.7?dB/cm) and an ultra 3?dB wideband (0.19?THz) considering the serious Ohmic losses. The theoretical results have been compared with those calculated by 3D HFSS code and CST STUDIO particle-in-cell simulations.

Xie, Wenqiu; He, Fangming [Institute of Electronics, Chinese Academy of Sciences, Beijing 100190 (China) [Institute of Electronics, Chinese Academy of Sciences, Beijing 100190 (China); University of Chinese Academy of Sciences, Beijing 100049 (China); Wang, Zicheng; Luo, Jirun; Zhao, Ding; Liu, Qinglun [Institute of Electronics, Chinese Academy of Sciences, Beijing 100190 (China)] [Institute of Electronics, Chinese Academy of Sciences, Beijing 100190 (China)

2014-04-15T23:59:59.000Z

137

A soft x-ray transmission grating imaging-spectrometer for the National Ignition Facility  

SciTech Connect (OSTI)

A soft x-ray transmission grating spectrometer has been designed for use on high energy-density physics experiments at the National Ignition Facility (NIF); coupled to one of the NIF gated x-ray detectors it records 16 time-gated spectra between 250 and 1000 eV with 100 ps temporal resolution. The trade-off between spectral and spatial resolution leads to an optimized design for measurement of emission around the peak of a 100-300 eV blackbody spectrum. Performance qualification results from the NIF, the Trident Laser Facility and vacuum ultraviolet beamline at the National Synchrotron Light Source, evidence a <100 {mu}m spatial resolution in combination with a source-size limited spectral resolution that is <10 eV at photon energies of 300 eV.

Moore, A. S.; Guymer, T. M.; Morton, J.; Bentley, C.; Stevenson, M. [Directorate Science and Technology, AWE Aldermaston, Reading, RG7 4PR (United Kingdom); Kline, J. L.; Taccetti, M.; Lanier, N. E.; Workman, J.; Peterson, B.; Mussack, K.; Cowan, J. [Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States); Prasad, R.; Richardson, M.; Burns, S.; Kalantar, D. H.; Benedetti, L. R.; Bell, P.; Bradley, D.; Hsing, W. [Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808 (United States)

2012-10-15T23:59:59.000Z

138

A soft x-ray transmission grating imaging-spectrometer for the National Ignition Facility  

SciTech Connect (OSTI)

A soft x-ray transmission grating spectrometer has been designed for use on high energy-density physics experiments at the National Ignition Facility (NIF); coupled to one of the NIF gated x-ray detectors (GXD) it records sixteen time-gated spectra between 250 and 1000eV with 100ps temporal resolution. The trade-off between spectral and spatial resolution leads to an optimized design for measurement of emission around the peak of a 100-300eV blackbody spectrum. Performance qualification results from the NIF, the Trident Laser Facility and VUV beamline at the National Synchrotron Light Source (NSLS), evidence a <100{micro}m spatial resolution in combination with a source-size limited spectral resolution that is <10eV at photon energies of 300eV.

Moore, A S; Guymer, T M; Kline, J L; Morton, J; Taccetti, M; Lanier, N E; Bentley, C; Workman, J; Peterson, B; Mussack, K; Cowan, J; Prasad, R; Richardson, M; Burns, S; Kalantar, D H; Benedetti, L R; Bell, P; Bradley, D; Hsing, W; Stevenson, M

2012-05-01T23:59:59.000Z

139

Inverted cones grating for flexible metafilter at optical and infrared frequencies  

SciTech Connect (OSTI)

By combining the antireflective properties from gradual changes in the effective refractive index and cavity coupling from cone gratings and the efficient optical behavior of a tungsten film, a flexible filter showing very broad antireflective properties from the visible to short wavelength infrared region and, simultaneously, a mirror-like behavior in the mid-infrared wavelength region and long-infrared wavelength region has been conceived. Nanoimprint technology has permitted the replication of inverted cone patterns on a large scale on a flexible polymer, afterwards coated with a thin tungsten film. This optical metafilter is of great interest in the stealth domain where optical signature reduction from the optical to short wavelength infrared region is an important matter. As it also acts as selective thermal emitter offering a good solar-absorption/infrared-emissivity ratio, interests are found as well for solar heating applications.

Brückner, Jean-Baptiste; Le Rouzo, Judikaël; Escoubas, Ludovic [Aix-Marseille Université, IM2NP, CNRS-UMR 7334, Domaine Universitaire de Saint-Jérôme, Service 231, 13397 Marseille Cedex 20 (France); Brissonneau, Vincent; Dubarry, Christophe [CEA-LITEN DTNM, 17 Avenue des Martyrs, 38054 Grenoble cedex 9 (France); Ferchichi, Abdelkerim; Gourgon, Cécile [LTM CNRS, Laboratoire des Technologies de la Microélectronique 17 Avenue des Martyrs, 38054 Grenoble cedex 9 (France); Berginc, Gérard [Thales Optronique S.A., 2 Avenue Gay Lussac, 78990 Elancourt (France)

2014-02-24T23:59:59.000Z

140

Graphene-based absorber exploiting guided mode resonances in one-dimensional gratings  

E-Print Network [OSTI]

A one-dimensional dielectric grating, based on a simple geometry, is proposed and investigated to enhance light absorption in a monolayer graphene exploiting guided mode resonances. Numerical findings reveal that the optimized configuration is able to absorb up to 60% of the impinging light at normal incidence for both TE and TM polarizations resulting in a theoretical enhancement factor of about 26 with respect to the monolayer graphene absorption (about 2.3%). Experimental results confirm this behaviour showing CVD graphene absorbance peaks up to about 40% over narrow bands of few nanometers. The simple and flexible design paves the way for the realization of innovative, scalable and easy-to-fabricate graphene-based optical absorbers.

Grande, M; Stomeo, T; Bianco, G V; de Ceglia, D; Akozbek, N; Petruzzelli, V; Bruno, G; De Vittorio, M; Scalora, M; Orazio, A D

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "monochromator sgm gratings" 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

An effective medium study of surface plasmon polaritons in nanostructured gratings using attenuated total reflection  

SciTech Connect (OSTI)

Recent work studied surface plasmon resonances in structured materials by the method of attenuated total reflection using a prism on top of a metallic grating. That calculation considered Transverse Magnetic polarized radiation, involved an expansion in 121 Fourier modes, and found a number of interesting features. Many of these features were attributed to localized plasmons or other factors, which arise from a discrete structure. We use a simple effective medium theory to address the same problem, and find many of the same reflection features observed in the more complex calculation, indicating that localization is not an important factor. We also evaluate the possibility of using some of the new features in the reflection spectrum for bio-sensing and find that the sensitivity of the system to small changes in relative permittivity is increased compared to some standard methods.

Tyboroski, M. H.; Anderson, N. R.; Camley, R. E. [UCCS BioFrontiers Center, University of Colorado at Colorado Springs, Colorado Springs, Colorado 80918 (United States)

2014-01-07T23:59:59.000Z

142

X-Atlas: An Online Archive of Chandra's Stellar High Energy Transmission Gratings Observations  

E-Print Network [OSTI]

The high-resolution X-ray spectroscopy made possible by the 1999 deployment of the Chandra X-ray Observatory has revolutionized our understanding of stellar X-ray emission. Many puzzles remain, though, particularly regarding the mechanisms of X-ray emission from OB stars. Although numerous individual stars have been observed in high-resolution, realizing the full scientific potential of these observations will necessitate studying the high-resolution Chandra dataset as a whole. To facilitate the rapid comparison and characterization of stellar spectra, we have compiled a uniformly processed database of all stars observed with the Chandra High Energy Transmission Grating (HETG). This database, known as X-Atlas, is accessible through a web interface with searching, data retrieval, and interactive plotting capabilities. For each target, X-Atlas also features predictions of the low-resolution ACIS spectra convolved from the HETG data for comparison with stellar sources in archival ACIS images. Preliminary analyses of the hardness ratios, quantiles, and spectral fits derived from the predicted ACIS spectra reveal systematic differences between the high-mass and low-mass stars in the atlas and offer evidence for at least two distinct classes of high-mass stars. A high degree of X-ray variability is also seen in both high and low-mass stars, including Capella, long thought to exhibit minimal variability. X-Atlas contains over 130 observations of approximately 25 high-mass stars and 40 low-mass stars and will be updated as additional stellar HETG observations become public. The atlas has recently expanded to non-stellar point sources, and Low Energy Transmission Grating (LETG) observations are currently being added as well.

Owen W. Westbrook; Nancy Remage Evans; Scott J. Wolk; Vinay L. Kashyap; Joy S. Nichols; Peter J. Mendygral; Jonathan D. Slavin; Bradley Spitzbart; Wayne L. Waldron

2007-12-04T23:59:59.000Z

143

A CENSUS OF X-RAY GAS IN NGC 1068: RESULTS FROM 450 ks of CHANDRA HIGH ENERGY TRANSMISSION GRATING OBSERVATIONS  

E-Print Network [OSTI]

We present models for the X-ray spectrum of the Seyfert 2 galaxy NGC 1068. These are fitted to data obtained using the High Energy Transmission Grating on Chandra. The data show line and radiative recombination continuum ...

Kallman, T.

144

Spectrally enhancing near-field radiative heat transfer by exciting magnetic polariton in SiC gratings  

E-Print Network [OSTI]

In the present work, we theoretically demonstrate, for the first time, that near field radiative transport between 1D periodic grating microstructures separated by subwavelength vacuum gaps can be significantly enhanced by exciting magnetic resonance or polariton. Fluctuational electrodynamics that incorporates scattering matrix theory with rigorous coupled wave analysis is employed to exactly calculate the near field radiative heat flux between two SiC gratings. Besides the well known coupled surface phonon polaritons (SPhP), an additional spectral radiative heat flux peak, which is due to magnetic polariton, is found within the phonon absorption band of SiC. The mechanisms, behaviors and interplays between magnetic polariton, coupled SPhP, single interface SPhP, and Wood's anomaly in the near field radiative transport are elucidated in detail. The findings will open up a new way to control near field radiative heat transfer by magnetic resonance with micro or nanostructured metamaterials.

Yang, Yue

2015-01-01T23:59:59.000Z

145

Measurement method for roll angular displacement with a high resolution by using diffraction gratings and a heterodyne interferometer  

SciTech Connect (OSTI)

The roll angle measurement is difficult to be achieved directly using a typical commercial interferometer due to its low sensitivity in axial direction, where the axial direction is orthogonal to the plane of the roll angular displacement. A roll angle measurement method combined diffraction gratings with a laser heterodyne interferometer is discussed in this paper. The diffraction grating placed in the plane of a roll angular displacement and the interferometer arranged in the plane's orthogonal direction, constitute the measurement pattern for the roll angle with high resolution. The roll angular displacement, considered as the linear, can be tested precisely when the corresponding angle is very small. Using the proposed method, the angle roll measurement obtains the high resolution of 0.002{sup ?}. Experiment has proved its feasibility and practicability.

Tang, Shanzhi, E-mail: shanzhit@gmail.com [Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049 (China) [Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049 (China); School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710049 (China); Wang, Zhao [School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710049 (China)] [School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710049 (China); Gao, Jianmin; Guo, Junjie [State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an 710054 (China)] [State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an 710054 (China)

2014-04-15T23:59:59.000Z

146

A novel millimeter-wave beam-steering technique using a dielectric-image-line-fed grating film  

E-Print Network [OSTI]

AND TECHNIQUE A. Leaky Waves B. Grating Antenna Theory C. Novel Beam-Steering Technique . . . III DIELECTRIC MAGE LINE ANALYSIS. . . 13 A Background B. Effective Dielectric Constant Calculation . . . C. Ka-Band Image Line Design... . . . . . . . . . . . . . 13 14 21 IV SCANNING ANTENNA DESIGN . . . V MEASUREMENT . A Measurement Procedure . B Beam-Steering Performance. . . C. Measured Radiation Patterns. . 31 36 CHAPTER Page D. Summary VI SUGGESTIONS AND RECOMMENDATIONS FOR FUTURE 42 STUDIES...

Rodenbeck, Christopher Timothy

2001-01-01T23:59:59.000Z

147

Interference of small and of large quantum particles behind an asymmetric grating  

SciTech Connect (OSTI)

Quantum theory of interference phenomena does not take the diameter of the particle into account, since particles were much smaller than the width of the slits before the rise of molecular interferometry. In the experiments with large molecules, the diameter of the particle has approached the width of the slits. Therefore, an analytical description of these cases should include a finite particle size. An asymmetric double-slit grating seems to be very suitable for the study of the influence of a particle's size on the interference pattern. We identify three characteristic cases for the ratio of slit widths {delta}{sub 1} and {delta}{sub 2} and the particle diameter D: D{delta}{sub 1} and D{delta}{sub 2}, {delta}{sub 1}>D>{delta}{sub 2}, and D>{delta}{sub 1}>{delta}{sub 2}. Taking into account the influence of both slits on the particle wave function, regardless of through which slit the particle passed, we treat the particle-wall interaction in a simple fashion, such that if the particle size is greater than the slit opening there is no transmission. The transverse momentum distribution is independent of the distance from the slits and the particle size, while the space distribution strongly depends on this distance and the particle size. We found that the interference is absent only when the particle's diameter is larger than both slit widths, D>{delta}{sub 1}>{delta}{sub 2}.

Bozic, Mirjana; Arsenovic, Dusan [Institute of Physics, P.O. Box 57, 11001 Belgrade (Serbia and Montenegro); Vuskovic, Leposava [Old Dominion University, Department of Physics, 4600 Elkhorn Avenue, Norfolk, Virginia 23529 (United States)

2004-05-01T23:59:59.000Z

148

Detector Having A Transmission Grating Beam Splitter For Multi-Wavelength Sample Analysis.  

DOE Patents [OSTI]

A detector for DNA sample identification is provided with a transmission grating beam splitter (TGBS). The TGBS split fluoresced light from a tagged DNA sample into 0th order and a 1st order components, both of which are detected on a two-dimensional detector array of a CCD camera. The 0th and 1st order components are detected along a column of pixels in the detector array, and are spaced apart from one another. The DNA samples are tagged with four fluorescent dyes, one dye specific for each nucleotide, and all four dyes responding in slightly different manner to the same monochromatic excitation signal. The TGBS splits fluoresced incoming light into 0th and 1st order components, which are then spread out among a number of pixels in the detector array. The 1st component of this light is received by pixels whose position relative to the 0th order component depends on the frequency of fluorescence. Thus, the position at which signal energy is detected on the array is indicative of the particular dye, and therefore, the corresponding nucleotide tagged by that dye. Monitoring signal energy at the 0th order pixel and selected 1st order pixels, provides a set of data from which one may then identify the particular nucleotide.

Liu, Changsheng (State College, PA); Li, Qingbo (State College, PA)

2000-09-12T23:59:59.000Z

149

Detector Having A Transmission Grating Beam Splitter For Multi-Wavelength.  

DOE Patents [OSTI]

A detector for DNA sample identification is provided with a transmission grating beam splitter (TGBS). The TGBS split fluoresced light from a tagged DNA sample into 0th order and a 1st order components, both of which are detected on a two-dimensional detector array of a CCD camera. The 0th and 1st order components are detected along a column of pixels in the detector array, and are spaced apart from one another. The DNA samples are tagged with four fluorescent dyes, one dye specific for each nucleotide, and all four dyes responding in slightly different manner to the same monochromatic excitation signal. The TGBS splits fluoresced incoming light into 0th and 1st order components, which are then spread out among a number of pixels in the detector array. The 1st component of this light is received by pixels whose position relative to the 0th order component depends on the frequency of fluorescence. Thus, the position at which signal energy is detected on the array is indicative of the particular dye, and therefore, the corresponding nucleotide tagged by that dye. Monitoring signal energy at the 0th order pixel and selected 1st order pixels, provides a set of data from which one may then identify the particular nucleotide.

Liu, Changsheng (State College, PA); Li, Qingbo (State College, PA

1999-12-07T23:59:59.000Z

150

Beam hardening effects in grating-based x-ray phase-contrast imaging  

SciTech Connect (OSTI)

Purpose: In this work, the authors investigate how beam hardening affects the image formation in x-ray phase-contrast imaging and consecutively develop a correction algorithm based on the results of the analysis. Methods: The authors' approach utilizes a recently developed x-ray imaging technique using a grating interferometer capable of visualizing the differential phase shift of a wave front traversing an object. An analytical description of beam hardening is given, highlighting differences between attenuation and phase-contrast imaging. The authors present exemplary beam hardening artifacts for a number of well-defined samples in measurements at a compact laboratory setup using a polychromatic source. Results: Despite the differences in image formation, the authors show that beam hardening leads to a similar reduction of image quality in phase-contrast imaging as in conventional attenuation-contrast imaging. Additionally, the authors demonstrate that for homogeneous objects, beam hardening artifacts can be corrected by a linearization technique, applicable to all kinds of phase-contrast methods using polychromatic sources. Conclusions: The evaluated correction algorithm is shown to yield good results for a number of simple test objects and can thus be advocated in medical imaging and nondestructive testing.

Chabior, Michael; Donath, Tilman; David, Christian; Bunk, Oliver; Schuster, Manfred; Schroer, Christian; Pfeiffer, Franz [Siemens AG Corporate Technology, 80200 Muenchen (Germany); Paul Scherrer Institut, 5232 Villigen PSI (Switzerland); Siemens AG Corporate Technology, 80200 Muenchen (Germany); Technische Universitaet Dresden, 01062 Dresden (Germany); Technische Universitaet Muenchen, 85748 Garching (Germany)

2011-03-15T23:59:59.000Z

151

Variable Spaced Grating (VSG) Snout, Rotator and Rails for use at LLE  

SciTech Connect (OSTI)

The Variable Spaced Grating (VSG) is a spectrometer snout mounted to an X-Ray Framing Camera (XRFC) through the Unimount flange. This equipment already exists and is used at the University of Rochester, Laboratory for Laser Energetics (LLE) facility. The XRFC and the Unimount flange are designed by LLE. The Tilt Rotator fixture that mounts next to the XRFC and the cart rails are designed by LLNL, and are included in this safety note. The other related components, such as the TIM rails and the Unimount flange, are addressed in a separate safety note, EDSN09-500005-AA. The Multipurpose Spectrometer (MSPEC) and VSG are mounted on the TIM Boat through the cart rails that are very similar in design. The tilt rotator combination with the Unimount flange is also a standard mounting procedure. The later mounting system has been included in this safety note. Figure-1 shows the interface components and the VSG snout. Figure-2 shows the VSG assembly mounted on the Unimount flange. The calibration pointer attachment is shown in place of the snout. There are two types of VSG, one made of 6061-T6 aluminum, weighing approximately 3 pounds, and the other made of 304 stainless steel, weighing approximately 5.5 pounds. This safety note examines the VSG steel design. Specific experiments may require orienting the VSG snout in 90 degrees increment with respect to the Unimount flange. This is done by changing the bolts position on the VSG-main body adapter flange to the Unimount adapter plate. There is no hazard involved in handling the VSG during this procedure as it is done outside the target chamber on the cart rail before installing on the TIM. This safety note addresses the mechanical integrity of the VSG structure, the tilt rotating fixture, the cart rails with handle and their connections. Safety Factors are also calculated for the MSPEC in place of the VSG.

Mukherjee, S K; Emig, J A; Griffith, L V; Heeter, R F; House, F A; James, D L; Schneider, M B; Sorce, C M

2010-01-25T23:59:59.000Z

152

Four combinations of two cosine gratings, the 2nd and 6th harmonics of a 0.5 c/deg grating (1 c/deg and 3 c/deg respectively), were used as the target stimulus patterns. Pattern 1 is the 2nd harmonic in isolation, pattern 2 is the 6th harmonic in isolatio  

E-Print Network [OSTI]

METHODS Four combinations of two cosine gratings, the 2nd and 6th harmonics of a 0.5 c/deg grating harmonic in isolation, pattern 2 is the 6th harmonic in isolation, pattern 3 is the 2nd plus the 6th and pattern 4 is the 2nd minus the 6th. The one-dimensional noise was the sum of 1st-7th harmonics of a 0.5c

Klein, Stanley

153

Coherent Atom Optics With Fast Metastable Beams: Metastable Helium Diffraction By 1D and 2D Magnetized Reflection Gratings  

SciTech Connect (OSTI)

1D and 2D reflection gratings (Permalloy stripes or dots deposited on silicon), immersed in an external homogeneous static magnetic field, are used to study 1D and 2D diffraction of fast metastable helium atoms He* (23S1). Both the grazing incidence used here and the repulsive potential (for sub-level m = -1) generated by the magnetisation reduce the quenching effect. This periodically structured potential is responsible for the diffraction in the incidence plane as well as for the diffraction in the perpendicular plane.

Grucker, J.; Baudon, J.; Karam, J.-C.; Perales, F.; Ducloy, M. [Laboratoire de Physique des Lasers, UMR-CNRS 7538, Universite Paris 13, 99, Avenue J.B. Clement, 93430-Villetaneuse (France); Bocvarski, V. [Institute of Physics, Pregrevica 118, 11080 - Belgrade-Zemun (Serbia and Montenegro)

2007-04-23T23:59:59.000Z

154

GNOSIS: THE FIRST INSTRUMENT TO USE FIBER BRAGG GRATINGS FOR OH SUPPRESSION  

SciTech Connect (OSTI)

The near-infrared is an important part of the spectrum in astronomy, especially in cosmology because the light from objects in the early universe is redshifted to these wavelengths. However, deep near-infrared observations are extremely difficult to make from ground-based telescopes due to the bright background from the atmosphere. Nearly all of this background comes from the bright and narrow emission lines of atmospheric hydroxyl (OH) molecules. The atmospheric background cannot be easily removed from data because the brightness fluctuates unpredictably on short timescales. The sensitivity of ground-based optical astronomy far exceeds that of near-infrared astronomy because of this long-standing problem. GNOSIS is a prototype astrophotonic instrument that utilizes 'OH suppression fibers' consisting of fiber Bragg gratings and photonic lanterns to suppress the 103 brightest atmospheric emission doublets between 1.47 and 1.7 {mu}m. GNOSIS was commissioned at the 3.9 m Anglo-Australian Telescope with the IRIS2 spectrograph to demonstrate the potential of OH suppression fibers, but may be potentially used with any telescope and spectrograph combination. Unlike previous atmospheric suppression techniques GNOSIS suppresses the lines before dispersion and in a manner that depends purely on wavelength. We present the instrument design and report the results of laboratory and on-sky tests from commissioning. While these tests demonstrated high throughput ( Almost-Equal-To 60%) and excellent suppression of the skylines by the OH suppression fibers, surprisingly GNOSIS produced no significant reduction in the interline background and the sensitivity of GNOSIS+IRIS2 is about the same as IRIS2. It is unclear whether the lack of reduction in the interline background is due to physical sources or systematic errors as the observations are detector noise dominated. OH suppression fibers could potentially impact ground-based astronomy at the level of adaptive optics or greater. However, until a clear reduction in the interline background and the corresponding increasing in sensitivity is demonstrated optimized OH suppression fibers paired with a fiber-fed spectrograph will at least provide a real benefit at low resolving powers.

Trinh, Christopher Q.; Ellis, Simon C.; Bland-Hawthorn, Joss; Bryant, Julia; O'Byrne, John [Sydney Institute for Astronomy, School of Physics, The University of Sydney, NSW 2006 (Australia); Lawrence, Jon S.; Horton, Anthony J.; Shortridge, Keith; Case, Scott; Colless, Matthew; Gers, Luke; Lee, Steve; Miziarski, Stan [Australian Astronomical Observatory, 105 Delhi Road, North Ryde, P.O. Box 915, NSW 1670 (Australia); Leon-Saval, Sergio G. [Institute of Photonics and Optical Science, School of Physics, University of Sydney, NSW 2006 (Australia); Couch, Warrick; Glazebrook, Karl [Centre for Astrophysics and Supercomputing, Swinburne University of Technology, P.O. Box 218, Hawthorn, VIC 3122 (Australia); Freeman, Kenneth [Research School of Astronomy and Astrophysics, Australian National University, Weston Creek, ACT 2611 (Australia); Loehmannsroeben, Hans-Gerd [innoFSPEC-Institut fuer Chemie/Physikalische Chemie, Universitaet Potsdam, Karl-Liebknecht-Strasse 24-25, D-14476 Potsdam-Golm (Germany); Haynes, Roger; Roth, Martin M., E-mail: c.trinh@physics.usyd.edu.au [innoFSPEC-Leibniz-Institut fuer Astrophysik Potsdam, An der Sternwarte 16, D-14482 Potsdam (Germany); and others

2013-02-01T23:59:59.000Z

155

Development of pseudo-random binary gratings and arrays for calibration of surface profile metrology tools  

SciTech Connect (OSTI)

Optical Metrology tools, especially for short wavelength (EUV and X-Ray), must cover a wide range of spatial frequencies from the very low, which affects figure, to the important mid-spatial frequencies and the high spatial frequency range, which produces undesirable flair. A major difficulty in using surface profilometers arises due to the unknown Modulation Transfer Function (MTF) of the instruments. Therefore, accurate calibration of profilometers, the understanding of their MTF limitations, and cross calibration between tools represents a considerable challenge for quantitative optical metrology. In previous work the instrumental MTF of a surface profiler was precisely measured using reference test surfaces based on binary pseudo-random (BPR) gratings. Here, they present results of fabricating and using two-dimensional (2D) BPR arrays that allow for a direct 2D calibration of the instrumental MTF. BPR sequences are widely used in engineering and communication applications such as Global Position System, and wireless communication protocol. The ideal BPR pattern has a flat 'white noise' response over the entire range of spatial frequencies of interest. The BPR array used here is based on the Uniformly Redundant Array prescription initially used for x-ray and gamma ray astronomy applications. The URA's superior imaging capability originates from the fact that its cyclical autocorrelation function very closely approximates a delta function, which produces a flat Power Spectrum Density (PSD). Three different BPR array patterns were fabricated by electron beam lithography and ICP etching of silicon. The basic size unit was 200 nm, 400 nm, and 600 nm. Figure 1 shows the fabrication sequence. The 2D BPR arrays were used as standard test surfaces for MTF calibration of the MicroMap{trademark}-570 interferometric microscope with all available objectives. Figure 2 shows representative scanning probe height data for the 400 nm BPR sample. Figure 2 shows the raw Power Spectral Density for 5 different objectives. They demonstrate that the two dimensional BPR array is a very effective calibration standard. However, departures from ideal, such as square sidewall, and uniform etch depth ultimately can limit the accuracy of the calibration. The effects of fabrication imperfections on the efficiency of calibration will be discussed.

Barber, Samuel K.; Soldate, Paul; Anderson, Erik; Cambie, Rosanna; McKinney, Wayne R.; Takacs, Peter Z.; Voronov, Dmytro L.; Yashchuk, Valeriy V.

2009-01-16T23:59:59.000Z

156

2D grating simulation for X-ray phase-contrast and dark-field imaging with a Talbot interferometer  

SciTech Connect (OSTI)

Talbot interferometry is a recently developed and an extremely powerful X-ray phase-contrast imaging technique. Besides giving access to ultra-high sensitivity differential phase contrast images, it also provides the dark field image, which is a map of the scattering power of the sample. In this paper we investigate the potentialities of an improved version of the interferometer, in which two dimensional gratings are used instead of standard line grids. This approach allows to overcome the difficulties that might be encountered in the images produced by a one dimensional interferometer. Among these limitations there are the phase wrapping and quantitative phase retrieval problems and the directionality of the differential phase and dark-field signals. The feasibility of the 2D Talbot interferometer has been studied with a numerical simulation on the performances of its optical components under different circumstances. The gratings can be obtained either by an ad hoc fabrication of the 2D structures or by a superposition of two perpendicular linear grids. Through this simulation it has been possible to find the best parameters for a practical implementation of the 2D Talbot interferometer.

Zanette, Irene; Weitkamp, Timm [European Synchrotron Radiation Facility, 6 rue Jules Horowitz, 38043 Grenoble (France); David, Christian; Rutishauser, Simon [Paul Scherrer Insitute, 5232 Villigen PSI (Switzerland)

2010-04-06T23:59:59.000Z

157

October 1, 2003 / Vol. 28, No. 19 / OPTICS LETTERS 1823 Tuning of laser pulse shapes in grating-based compressors for  

E-Print Network [OSTI]

October 1, 2003 / Vol. 28, No. 19 / OPTICS LETTERS 1823 Tuning of laser pulse shapes in grating, C. B. Schroeder, E. Esarey, and W. P. Leemans Lasers Optics and Accelerator Systems Integrated to optimize a laser-plasma electron accelerator. © 2003 Optical Society of America OCIS codes: 320.5520, 320

Geddes, Cameron Guy Robinson

158

Grating arrays for high--throughput soft X-ray spectrometers A. Rasmussena A. Aquilab j BookbinderC C. Chang E. Gulliksonb R. Heilmanne  

E-Print Network [OSTI]

Address: 550 West 120 Street, New York, NY 10027 Optics for EUV, X-Ray, and Gamma-Ray Astronomy, editedColumbja Astrophysics Lab, 550 West 120th Street, New York, New York, USA bCenter for X-ray Optics, Lawrence Berkeley optic, to be assembled using identical, flat grating parts. An example of such an optic has been built

159

IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS, VOL. 5, NO. 1, JANUARY/FEBRUARY 1999 75 Diffraction Grating Scanners Using  

E-Print Network [OSTI]

THERE is an increasing need in today's marketplace to develop low-cost high-precision optical scanners for a variety with single and pyramidal diffraction grating elements fabricated on the polished surface of large-area rotors, the technology has advanced toward optical applications [2]. A 20- m-tall reflective nickel polygon, plated

Merat, Francis L.

160

Temporal characteristics of polarization holographic gratings formed in a photosensitive polymeric film containing N-benzylideneaniline derivative side groups  

SciTech Connect (OSTI)

A polarization holographic grating was recorded in a transparent thin film formed from polymethacrylate with N-benzylideneaniline (NBA) derivative side groups. We measured the real time diffraction properties. The data were analyzed based on a theoretical model that accounted for the distribution of optical anisotropy caused by molecular reorientation as well as for surface relief (SR) deformation caused by molecular motion. Optical anisotropy rapidly increased and then slowly decreased, with increasing recording time. This phenomenon was described based on photoisomerization and photocleavage reactions of the NBA side groups. SR deformation was also induced in the film by polarization holographic recording, without any subsequent processes. The photoinduced optical anisotropy and SR deformation were retained after the recording was turned off.

Sasaki, Tomoyuki, E-mail: sasaki-tomoy@vos.nagaokaut.ac.jp; Shoho, Takashi; Noda, Kohei; Ono, Hiroshi [Department of Electrical Engineering, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka, Niigata 940-2188 (Japan); Kawatsuki, Nobuhiro [Department of Materials Science and Chemistry, Graduate School of Engineering, University of Hyogo, 2167 Shosha, Himeji, Hyogo 671-2280 (Japan)

2014-04-21T23:59:59.000Z

Note: This page contains sample records for the topic "monochromator sgm gratings" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
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We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

Optical Transient-Grating Measurements of Spin Diffusion andRelaxation in a Two-Dimensional Electron Gas  

SciTech Connect (OSTI)

Spin diffusion in n-GaAs quantum wells, as measured by our optical transient-grating technique, is strongly suppressed relative to that of charge. Over a broad range of temperatures and dopings, the suppression of Ds relative to Dc agrees quantitatively with the prediction of ''spin Coulomb dra'' theory, which takes into account the exchange of spin in electron-electron collisions. Moreover, the spin-diffusion length, Ls, is a nearly constant 1 micrometer over the same range of T and n, despite Ds's varying by nearly two orders of magnitude. This constancy supports the D'yakonov-Perel'-Kachorovskii model of spin relaxation through interrupted precessional dephasing in the spin-orbit field.

Weber, Christopher P.

2005-12-15T23:59:59.000Z

162

Demonstrations of diode-pumped and grating-tuned ZnSe:Cr{sup 2+} lasers. Revision 1  

SciTech Connect (OSTI)

A diode-side-pumped ZnSe:Cr{sup 2+} laser was operated with a 75 - Watt peak power 1.65 {micro}m InGaAsP/InP pump array. The laser was configured with a ``single-bounce`` architecture to maximize its round-trip gain. Peak output powers of {approx}0.3 Watt were obtained with a 10% - transmitting output coupler and a lightly-doped crystal. The estimated ``mode fill`` of {approx}0.06 will increase with Cr{sup 2+} concentration, raising the output power and extraction efficiency. With a grating tuner and MgF{sub 2}:Co{sup 2+} laser pumping, the laser tuned throughout the 2134 - 2799 nm range.

Page, R.H.; Skidmore, J.A.; Schaffers, K.I.; Beach, R.J.; Payne, S.A.; Krupke, W.F.

1997-02-14T23:59:59.000Z

163

Reproducible strain measurement in electronic devices by applying integer multiple to scanning grating in scanning moiré fringe imaging  

SciTech Connect (OSTI)

Scanning moiré fringe (SMF) imaging by high-angle annular dark field scanning transmission electron microscopy was used to measure the strain field in the channel of a transistor with a CoSi{sub 2} source and drain. Nanometer-scale SMFs were formed with a scanning grating size of d{sub s} at integer multiples of the Si crystal lattice spacing d{sub l} (d{sub s} ? nd{sub l}, n = 2, 3, 4, 5). The moiré fringe formula was modified to establish a method for quantifying strain measurement. We showed that strain fields in a transistor measured by SMF images were reproducible with an accuracy of 0.02%.

Kim, Suhyun, E-mail: u98kim@surface.phys.titech.ac.jp; Jung, Younheum; Kim, Joong Jung; Lee, Sunyoung; Lee, Haebum [Memory Analysis Science and Engineering Group, Samsung Electronics, San #16 Hwasung-city, Gyeonggi-Do 445-701 (Korea, Republic of); Kondo, Yukihito [EM Business Unit, JEOL Ltd., 3-1-2 Musashino, Akishima, Tokyo 196-8558 (Japan)

2014-10-15T23:59:59.000Z

164

Investigation of ultrafast photothermal surface expansion and diffusivity in GaAs via laser-induced dynamic gratings  

SciTech Connect (OSTI)

This thesis details the first direct ultrafast measurements of the dynamic thermal expansion of a surface and the temperature dependent surface thermal diffusivity using a two-color reflection transient grating technique. Studies were performed on p-type, n-type, and undoped GaAs(100) samples over a wide range of temperatures. By utilizing a 90 fs ultraviolet probe with visible excitation beams, the effects of interband saturation and carrier dynamics become negligible; thus lattice expansion due to heating and subsequent contraction caused by cooling provided the dominant influence on the probe. At room temperature a rise due to thermal expansion was observed, corresponding to a maximum net displacement of {approximately} 1 {Angstrom} at 32 ps. The diffracted signal was composed of two components, thermal expansion of the surface and heat flow away from the surface, thus allowing a determination of the rate of expansion as well as the surface thermal diffusivity, D{sub S}. By varying the fringe spacing of the grating, this technique has the potential to separate the signal contributions to the expansion of the lattice in the perpendicular and parallel directions. In the data presented here a large fringe spacing was used, thus the dominant contribution to the rising edge of the signal was expansion perpendicular to the surface. Comparison of he results with a straightforward thermal model yields good agreement over a range of temperatures (20--300{degrees}K). Values for D{sub S} in GaAs were measured and found to be in reasonable agreement with bulk values above 50{degrees}K. Below 50{degrees}K, D{sub S} were determined to be up to an order of magnitude slower than the bulk diffusivity due to increased phonon boundary scattering. The applicability and advantages of the TG technique for studying photothermal and photoacoustic phenomena are discussed.

Pennington, D.M.

1992-04-01T23:59:59.000Z

165

Enhanced Diffraction from a Grating on the Surface of a Negative-Index Metamaterial D. R. Smith, P. M. Rye, J. J. Mock, D. C. Vier, and A. F. Starr  

E-Print Network [OSTI]

Enhanced Diffraction from a Grating on the Surface of a Negative-Index Metamaterial D. R. Smith, P be carefully reexamined in the context of negative-index media. For example, in an analysis of the imaging

Nemat-Nasser, Sia

166

Measurement of electron-hole friction in an n-doped GaAs/AlGaAs quantum well using optical transient-grating spectroscopy  

SciTech Connect (OSTI)

We use phase-resolved transient grating spectroscopy to measure the drift and diffusion of electron-hole density waves in a semiconductor quantum well. The unique aspects of this optical probe allow us to determine the frictional force between a two-dimensional Fermi liquid of electrons and a dilute gas of holes. Knowledge of electron-hole friction enables prediction of ambipolar dynamics in high-mobility electron systems.

Yang, Luyi; Koralek, J. D.; Orenstein, J.; Tibbetts, D. R.; Reno, J. L.; Lilly, M. P.

2011-04-26T23:59:59.000Z

167

Ultrasonic generator and detector using an optical mask having a grating for launching a plurality of spatially distributed, time varying strain pulses in a sample  

DOE Patents [OSTI]

A method and a system are disclosed for determining at least one characteristic of a sample that contains a substrate and at least one film disposed on or over a surface of the substrate. The method includes a first step of placing a mask over a free surface of the at least one film, where the mask has a top surface and a bottom surface that is placed adjacent to the free surface of the film. The bottom surface of the mask has formed therein or thereon a plurality of features for forming at least one grating. A next step directs optical pump pulses through the mask to the free surface of the film, where individual ones of the pump pulses are followed by at least one optical probe pulse. The pump pulses are spatially distributed by the grating for launching a plurality of spatially distributed, time varying strain pulses within the film, which cause a detectable change in optical constants of the film. A next step detects a reflected or a transmitted portion of the probe pulses, which are also spatially distributed by the grating. A next step measures a change in at least one characteristic of at least one of reflected or transmitted probe pulses due to the change in optical constants, and a further step determines the at least one characteristic of the sample from the measured change in the at least one characteristic of the probe pulses. An optical mask is also disclosed herein, and forms a part of these teachings.

Maris, Humphrey J. (Barrington, RI)

2003-01-01T23:59:59.000Z

168

Ultrasonic generator and detector using an optical mask having a grating for launching a plurality of spatially distributed, time varying strain pulses in a sample  

DOE Patents [OSTI]

A method and a system are disclosed for determining at least one characteristic of a sample that contains a substrate and at least one film disposed on or over a surface of the substrate. The method includes a first step of placing a mask over a free surface of the at least one film, where the mask has a top surface and a bottom surface that is placed adjacent to the free surface of the film. The bottom surface of the mask has formed therein or thereon a plurality of features for forming at least one grating. A next step directs optical pump pulses through the mask to the free surface of the film, where individual ones of the pump pulses are followed by at least one optical probe pulse. The pump pulses are spatially distributed by the grating for launching a plurality of spatially distributed, time varying strain pulses within the film, which cause a detectable change in optical constants of the film. A next step detects a reflected or a transmitted portion of the probe pulses, which are also spatially distributed by the grating. A next step measures a change in at least one characteristic of at least one of reflected or transmitted probe pulses due to the change in optical constants, and a further step determines the at least one characteristic of the sample from the measured change in the at least one characteristic of the probe pulses. An optical mask is also disclosed herein, and forms a part of these teachings.

Maris, Humphrey J. (Barrington, RI)

2002-01-01T23:59:59.000Z

169

Fabrication and testing of diamond-machined gratings in ZnSe, GaP, and bismuth germanate for the near infrared and visible  

SciTech Connect (OSTI)

High quality immersion gratings for infrared applications have been demonstrated in silicon and germanium. To extend this technology to shorter wavelengths other materials must be investigated. We selected three materials, zinc selenide, gallium phosphide and bismuth germanate (Bi{sub 4}Ge{sub 3}O{sub 12}), based on high refractive index, good visible transmission and commercial availability in useful sizes. Crystal samples were diamond turned on an ultra-precision lathe to identify preferred cutting directions. Using this information we diamond-flycut test gratings over a range of feed rates to determine the optimal cutting conditions. For both ZnSe and GaP good surface quality was achieved at feed rates up to 1.0 cm/minute using a special compound angle diamond tool with negative rake angles on both cutting surfaces. The surface roughness of the groove facets was about 4 nm. A Zygo interferometer measured grating wavefront errors in reflection. For the ZnSe the RMS error was < {lambda}/20 at 633nm. More extensive testing was performed with a HeNe laser source and a cooled CCD camera. These measurements demonstrated high relative diffraction efficiency (> 80%), low random groove error (2.0 nm rms), and Rowland ghost intensities at < 0.1%. Preliminary tests on bismuth germanate show high tool wear.

Kuzmenko, P J; Little, S L; Ikeda, Y; Kobayashi, N

2008-06-22T23:59:59.000Z

170

Experimental comparison of grating- and propagation-based hard X-ray phase tomography of soft tissue  

SciTech Connect (OSTI)

When imaging soft tissues with hard X-rays, phase contrast is often preferred over conventional attenuation contrast due its superior sensitivity. However, it is unclear which of the numerous phase tomography methods yields the optimized results at given experimental conditions. Therefore, we quantitatively compared the three phase tomography methods implemented at the beamline ID19 of the European Synchrotron Radiation Facility: X-ray grating interferometry (XGI), and propagation-based phase tomography, i.e., single-distance phase retrieval (SDPR) and holotomography (HT), using cancerous tissue from a mouse model and an entire heart of a rat. We show that for both specimens, the spatial resolution derived from the characteristic morphological features is about a factor of two better for HT and SDPR compared to XGI, whereas the XGI data generally exhibit much better contrast-to-noise ratios for the anatomical features. Moreover, XGI excels in fidelity of the density measurements, and is also more robust against low-frequency artifacts than HT, but it might suffer from phase-wrapping artifacts. Thus, we can regard the three phase tomography methods discussed as complementary. The application will decide which spatial and density resolutions are desired, for the imaging task and dose requirements, and, in addition, the applicant must choose between the complexity of the experimental setup and the one of data processing.

Lang, S.; Schulz, G.; Müller, B. [Biomaterials Science Center, University of Basel, Basel (Switzerland); Zanette, I., E-mail: irene.zanette@tum.de [Physik-Department und Institut für Medizintechnik, Technische Universität München, Garching (Germany); European Synchrotron Radiation Facility, Grenoble (France); Dominietto, M. [Biomaterials Science Center, University of Basel, Basel (Switzerland); Institute for Biomedical Engineering, ETH Zürich, Zürich (Switzerland); Langer, M. [European Synchrotron Radiation Facility, Grenoble (France); Université de Lyon, CREATIS, CNRS UMR5220, Inserm U1044, INSA-LYON, Université de Lyon 1, Villeurbane (France); Rack, A.; Le Duc, G. [European Synchrotron Radiation Facility, Grenoble (France); David, C. [Laboratory for Micro- and Nanotechnology, Paul Scherrer Institut, Villigen (Switzerland); Mohr, J. [Institute of Microstructure Technology, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen (Germany); Pfeiffer, F. [Physik-Department und Institut für Medizintechnik, Technische Universität München, Garching (Germany); Weitkamp, T. [European Synchrotron Radiation Facility, Grenoble (France); Synchrotron Soleil, Gif-sur-Yvette (France)

2014-10-21T23:59:59.000Z

171

Jay Grate | EMSL  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmospheric Optical Depth7-1D: Vegetation ProposedUsingFunInfraredJefferson Lab Click on theJames D. effortsOSTI, USSh ortfirefoxJay

172

INHIBITION OF PHOTOSYNTHESIS IN CERTAIN ALGAE BY EXTREME RED LIGHT  

E-Print Network [OSTI]

INHIBITION OF PHOTOSYNTHESIS IN CERTAIN ALGAE BY EXTREME RED LIGHT GOVINDJEE, EUGENE RABINOWITCH. INTRODUCTION It was shown in preceding papers (9, 10) that when the unicellular red alga Por- phyridium), these algae, when exposed to monochromatic light (bands isolated by a grating monochromator, band half

Govindjee

173

Theoretical analysis and experiments on antireflection coatings for laser diodes  

E-Print Network [OSTI]

was set on dB, the time constant ivas 100 ms, and the sensitivity was 10 mV. A special controller was designed and constructed to operate the monochromator and to provide a, voltage proportional to the grating position. The X-axis of the plotter ivas...

Chin, Kai Jian

1987-01-01T23:59:59.000Z

174

Experimental Demonstration of a Soft X-ray Self-seeded Free-electron Laser  

DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

The Linac Coherent Light Source (LCLS) has added self-seeding capability to the soft x-ray range using a grating monochromator system. We report demonstration of soft x-ray self-seeding with a measured resolving power of 2000-5000, wavelength stability of 10-4, and an increase in peak brightness by a factor of 2-5 across the photon energy range of 500-1000 eV. By avoiding the need for a monochromator at the experimental station, the self-seeded beam can deliver as much as 50 fold higher brightness to users.

Ratner, D. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Abela, R. [Paul Scherrer Inst. (PSI), Villigen (Switzerland); Amann, J. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Behrens, C. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Bohler, D. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Bouchard, G. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Bostedt, C. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Boyes, M. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Chow, K. [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Cocco, D. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Decker, F. J. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Ding, Y. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Eckman, C. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Emma, P. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Fairley, D. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Feng, Y. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Field, C. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Flechsig, U. [Paul Scherrer Inst. (PSI), Villigen (Switzerland); Gassner, G. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Hastings, J. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Heimann, P. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Huang, Z. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Kelez, N. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Krzywinski, J. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Loos, H. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Lutman, A. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Marinelli, A. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Marcus, G. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Maxwell, T. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Moeller, S. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Morton, D. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Nuhn, H. D. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Rodes, N. [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Schlotter, W. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Serkez, S. [Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany); Stevens, T. [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Turner, J. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Walz, D. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Welch, J. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Wu, J. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States)

2015-02-06T23:59:59.000Z

175

Gratings Inc | Open Energy Information  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data CenterFranconia, Virginia: Energy Resources Jump to: navigation,Ohio: EnergyGrasslands Renewable Energy LLC Jump to: navigation,

176

Time and spectrum-resolving multiphoton correlator for 300–900?nm  

SciTech Connect (OSTI)

We demonstrate a single-photon sensitive spectrometer in the visible range, which allows us to perform time-resolved and multi-photon spectral correlation measurements at room temperature. It is based on a monochromator composed of two gratings, collimation optics, and an array of single photon avalanche diodes. The time resolution can reach 110 ps and the spectral resolution is 2?nm/pixel, limited by the design of the monochromator. This technique can easily be combined with commercial monochromators and can be useful for joint spectrum measurements of two photons emitted in the process of parametric down conversion, as well as time-resolved spectrum measurements in optical coherence tomography or medical physics applications.

Johnsen, Kelsey D.; Thibault, Marilyne; Jennewein, Thomas [Institute for Quantum Computing and Department for Physics and Astronomy, University of Waterloo, 200 University Ave. West, Waterloo, Ontario N2L 3G1 (Canada); Kolenderski, Piotr, E-mail: kolenderski@fizyka.umk.pl [Institute for Quantum Computing and Department for Physics and Astronomy, University of Waterloo, 200 University Ave. West, Waterloo, Ontario N2L 3G1 (Canada); Faculty of Physics, Astronomy and Informatics, Institute of Physics, Nicolaus Copernicus University, Grudziadzka 5, 87-100 Torun (Poland); Scarcella, Carmelo; Tosi, Alberto [Dipartimento di Elettronica, Informazione e Bioingegneria, Politecnico di Milano, Piazza Leonardo da Vinci 32, I-20133 Milano (Italy)

2014-10-14T23:59:59.000Z

177

als double-crystal monochromator: Topics by E-print Network  

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

newest additions to Sony's Bsec. for compatibility with slower vision systems using Sony XC-55 cameras. The XC-HR50 and XC-HR70 cameras incorporate Demoulin, Pascal 20 Stress...

178

E-Print Network 3.0 - artificial channel-cut monochromator Sample...  

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

Physics 20 INFLUENCE OF QUANTUM-DOTS DENSITY ON AVERAGE IN-PLANE STRAIN OF OPTOELECTRONIC DEVICES Summary: detector channel-cut Ge220 analyser sample X-ray tube point focus...

179

E-Print Network 3.0 - acceptance crystal monochromator Sample...  

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

... Source: Controlled Fusion Atomic Data Center (CFADC) Collection: Plasma Physics and Fusion 13 MACS -A New High Intensity Cold Neutron Spectrometer at NIST Summary: V (Ei2.1...

180

Thermal and mechanical joints to cryo-cooled silicon monochromator crystals  

E-Print Network [OSTI]

resistance of the joint. The operating temperature of –150 ooperating temperature range was as small as possible in an attempt to reduce the strain in the joint and

MacDowell, A.; Fakra, S.; Morrison, G.

2006-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "monochromator sgm gratings" 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

Periodic magnetic fieldas a polarized and focusing thermal neutron spectrometer and monochromator  

E-Print Network [OSTI]

B828?. The aluminum spacers had dimensions 12.7 ? 2.54? 12.7magnet pole dimension ?axial width? Aluminum spacer width

2010-01-01T23:59:59.000Z

182

ANL/APS/TB-24 Diamond Monochromators for APS Undulator-A Beamlines  

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

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183

Warm absorbers in X-rays (WAX), a comprehensive high resolution grating spectral study of a sample of Seyfert galaxies: I. A global view and frequency of occurrence of warm absorbers  

E-Print Network [OSTI]

We present results from a homogeneous analysis of the broadband 0.3-10 keV CCD resolution as well as of soft X-ray high-resolution grating spectra of a hard X-ray flux-limited sample of 26 Seyfert galaxies observed with XMM-Newton. Our goal is to characterise the warm absorber (WA) properties along the line-of-sight to the active nucleus. We significantly detect WAs in $65\\%$ of the sample sources. Our results are consistent with WAs being present in at least half of the Seyfert galaxies in the nearby Universe, in agreement with previous estimates . We find a gap in the distribution of the ionisation parameter in the range $0.5warm absorber flow is probably constituted by a clumpy distribution of discrete clouds rather than a continuous medium. The distribution of the WA column densities for the sources with broad Fe K$\\alpha$ lines are similar to those sources which do not have broadened emission l...

Laha, Sibasish; Dewangan, Gulab C; Chakravorty, Susmita; Kembhavi, Ajit K

2014-01-01T23:59:59.000Z

184

Edinburgh Research Explorer Be Grateful for Drizzle  

E-Print Network [OSTI]

microwave transmission, using `dishes' (antennae) on a series of towers gets you the necessary speed;2 the towers to re-align them, those involved tell me that a good microwave link will work well over 99 percent

Millar, Andrew J.

185

A computational inverse diffraction grating problem  

E-Print Network [OSTI]

Mar 2, 2012 ... The scattering theory in periodic structures has many applications in ... tures may be found in the book by Colton and Kress [19] and references cited .... with an unknown periodic density function ? in L2?0; ??, where the ...

2012-02-29T23:59:59.000Z

186

Acknowledgments: we are grateful to Dr Descazeaud,  

E-Print Network [OSTI]

transfusion reaction in children with sickle cell disease Mariane de Montalembert,1 Marie-Dominique Dumont,2 is a cornerstone of the management of sickle cell disease but carries a high risk of hemolytic transfusion reaction and mimicked other complications of sickle cell disease. In most of our cases, no new antibody was identified

Boyer, Edmond

187

Fiber Grating Moisture And Chemical Sensing System  

DOE Patents [OSTI]

A vane for a stator of a variable-geometry turbine, in particular for aeronautical engines, has an airfoil profile and a pair of hinge portions, which are carried by the airfoil profile and enable the airfoil profile to be coupled to a support structure of the stator so as to be rotatable about an axis of adjustment; the vane also has internal channels that allow a flow of air to pass through in order to cool the hinge portions.

Schipani, Claudia (Turin, IT); Spano, Ennio (Turin, IT); Dalle Crode, Domenico (Turin, IT)

2004-01-27T23:59:59.000Z

188

Multiorder rotating grating interferometer John Howard  

E-Print Network [OSTI]

, Research School of Physical Sciences,The Australian National University, Canberra, ACT 2601, Australia

Howard, John

189

High resolution ion Doppler spectroscopy at Prairie View Rotamak  

SciTech Connect (OSTI)

A fast ion Doppler spectroscopy (IDS) diagnostic system is installed on the Prairie View Rotamak to measure ion temperature and plasma flow. The diagnostic employs a single channel photomultiplier tube and a Jarrell-Ash 50 monochromator with a diffraction grating line density of 1180 lines/mm, which allows for first order spectra of 200-600 nm. The motorized gear of the monochromator allows spectral resolution of 0.01 nm. Equal IDS measurements are observed for various impurity emission lines of which carbon lines exhibit stronger intensities. Furthermore, the diagnostics is examined in an experiment where plasma experiences sudden disruption and quick recovery. In this case, the IDS measurements show {approx}130% increase in ion temperature. Flow measurements are shown to be consistent with plasma rotation.

Houshmandyar, Saeid; Yang Xiaokang [Solar Observatory Department, Prairie View A and M University, Prairie View, Texas 77446 (United States); Magee, Richard [Department of Physics, West Virginia University, Morgantown, West Virginia 26506 (United States)

2012-10-15T23:59:59.000Z

190

A New Multilayer-Based Grating for Hard X-ray Grating Interferometry |  

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

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191

VerDate jul2003 16:57 Aug 19, 2005 Jkt 205001 PO 00000 Frm 00001 Fmt 4717 Sfmt 4717 E:\\FR\\FM\\22AUP2.SGM 22AUP2 August 22, 2005  

E-Print Network [OSTI]

Health and Environmental Radiation Protection Standards for Yucca Mountain, Nevada; Proposed Rule #12;Ver and Environmental Radiation Protection Standards for Yucca Mountain, NV AGENCY: Environmental Protection Agency of in the potential repository at Yucca Mountain, Nevada. Section 801(a) of the Energy Policy Act of 1992 (EnPA, Pub

192

VerDate 112000 14:19 Jun 12, 2001 Jkt 194001 PO 00000 Frm 00001 Fmt 4717 Sfmt 4717 E:\\FR\\FM\\13JNR2.SGM pfrm07 PsN: 13JNR2 June 13, 2001  

E-Print Network [OSTI]

Part 197 Public Health and Environmental Radiation Protection Standards for Yucca Mountain, NV; Final Health and Environmental Radiation Protection Standards for Yucca Mountain, NV AGENCY: Environmental repository at Yucca Mountain, Nevada. Section 801 of the Energy Policy Act of 1992 (EnPA, Pub. L. 102

193

Study on higher harmonic suppression using edge filter and polished Si wafer  

SciTech Connect (OSTI)

Higher harmonics contamination is a severe problem in synchrotron beamlines where grating monochromators are used. In these beamlines, absorption edge filters and critical angle mirrors are used to suppress the harmonic contaminations. In the present study, carried out using Indus-1 reflectivity beamline, a harmonic suppression characteristic of Al edge filter and polished silicon wafer are determined. It is found that the Al filter suppresses higher harmonics in 2–7% range whereas the polished silicon wafer can suppress the higher harmonics below 1%. The results of comparative study are discussed.

Gupta, R. K., E-mail: rkg@rrcat.gov.in; Singh, Amol, E-mail: rkg@rrcat.gov.in; Modi, Mohammed H., E-mail: rkg@rrcat.gov.in; Lodha, G. S., E-mail: rkg@rrcat.gov.in [X-ray Optics Section, ISU Division, Raja Ramanna Centre for Advanced Technology, Indore-452013 (India)

2014-04-24T23:59:59.000Z

194

ReseaRch at the University of Maryland Climate Mitigation and Adaptation  

E-Print Network [OSTI]

-shrinking budgets. Steve Fetter models energy scenarios to helps policy makers see that a viable low-carbon future's Second Generation Model (SGM) is a global general-equilibrium model that projects energy consumption, agriculture, energy, energy-intense industries, household consumption, and government expenditure. SGM offers

Hill, Wendell T.

195

Spectrally broadband channeled imaging polarimeter using polarization gratings  

E-Print Network [OSTI]

polarimeters (CIP) [1]. Here, we focus on developing the technique of CIP [3-6]. In CIP, the 2-dimensional an instrumentation improvement for CIP, described in our previous publications. For further theoretical derivations version of our white-light CIP, originally based on a modified Sagnac interferometer [8, 9

Dereniak, Eustace L.

196

Town Known for First Thanksgiving Grateful for Energy Savings...  

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

efficiency upgrades, including a new chiller for the air conditioning system, occupancy sensors to turn on the air conditioning in targeted sections of the building and a wide...

197

Near-field imaging of perfectly conducting grating surfaces  

E-Print Network [OSTI]

Nov 8, 2013 ... We consider the diffraction when a time-harmonic electro- magnetic ... ness and stability for the inverse problem have been studied by many ...

2013-11-06T23:59:59.000Z

198

Near-field imaging of perfectly conducting grating surfaces  

E-Print Network [OSTI]

We consider the diffraction when a time-harmonic electro- magnetic plane wave is ... ness and stability for the inverse problem have been studied by many ...

2013-11-06T23:59:59.000Z

199

Numerical solution of an inverse diffraction grating problem from ...  

E-Print Network [OSTI]

Feb 5, 2013 ... The diffraction of time- harmonic electromagnetic waves by some periodic material ... patterns [7–10]. Uniqueness results and stability estimates.

2013-02-02T23:59:59.000Z

200

Fabrications of PVDF gratings :final report for LDRD project 79884.  

SciTech Connect (OSTI)

The purpose of this project was to do some preliminary studies and process development on electroactive polymers to be used for tunable optical elements and MEMS actuators. Working in collaboration between Sandia National Labs and The University of Illinois Urbana-Champaign, we have successfully developed a process for applying thin films of poly (vinylidene fluoride) (PVDF) onto glass substrates and patterning these using a novel stamping technique. We observed actuation in these structures in static and dynamic measurements. Further work is needed to characterize the impact that this approach could have on the field of tunable optical devices for sensing and communication.

Rogers, J. A. (University of Illinois, Urbana-Champaign); Carr, Dustin Wade; Bogart, Gregory R.

2005-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "monochromator sgm gratings" 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

Radiation induced by relativistic beams passing over a diffraction grating  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsrucLas ConchasPassive Solar HomePromising Science for1 20115,Performance QualityRadiation August

202

ALS Scientists Patent Technique To Dramatically Advance Grating-Based  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May Jun Jul(Summary)morphinanInformation Desert SouthwestTechnologies |November 2011Astudies smartHistory: The First 20ALS

203

ALS Scientists Patent Technique To Dramatically Advance Grating-Based  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsrucLasDelivered‰PNGExperience4AJ01) (See95TI07)Operations DuringALS DoctoralALSSpectroscopy ALS

204

A high-order harmonic generation apparatus for time- and angle-resolved photoelectron spectroscopy  

SciTech Connect (OSTI)

We present a table top setup for time- and angle-resolved photoelectron spectroscopy to investigate band structure dynamics of correlated materials driven far from equilibrium by femtosecond laser pulse excitation. With the electron-phonon equilibration time being in the order of 1–2 ps it is necessary to achieve sub-picosecond time resolution. Few techniques provide both the necessary time and energy resolution to map non-equilibrium states of the band structure. Laser-driven high-order harmonic generation is such a technique. In our experiment, a grating monochromator delivers tunable photon energies up to 40 eV. A photon energy bandwidth of 150 meV and a pulse duration of 100 fs FWHM allow us to cover the k-space necessary to map valence bands at different k{sub z} and detect outer core states.

Frietsch, B.; Gahl, C.; Teichmann, M.; Weinelt, M. [Freie Universität Berlin, Arnimallee 14, 14195 Berlin (Germany)] [Freie Universität Berlin, Arnimallee 14, 14195 Berlin (Germany); Carley, R. [Freie Universität Berlin, Arnimallee 14, 14195 Berlin (Germany) [Freie Universität Berlin, Arnimallee 14, 14195 Berlin (Germany); Max-Born-Institut, Max-Born-Str. 2a, 12489 Berlin (Germany); Döbrich, K. [Max-Born-Institut, Max-Born-Str. 2a, 12489 Berlin (Germany)] [Max-Born-Institut, Max-Born-Str. 2a, 12489 Berlin (Germany); Schwarzkopf, O.; Wernet, Ph. [Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Albert-Einstein-Str. 15, 12489 Berlin (Germany)] [Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Albert-Einstein-Str. 15, 12489 Berlin (Germany)

2013-07-15T23:59:59.000Z

205

Development of soft X-ray polarized light beamline on Indus-2 synchrotron radiation source  

SciTech Connect (OSTI)

This article describes the development of a soft x-ray beamline on a bending magnet source of Indus-2 storage ring (2.5 GeV) and some preliminary results of x-ray absorption spectroscopy (XAS) measurements using the same. The beamline layout is based on a spherical grating monochromator. The beamline is able to accept synchrotron radiation from the bending magnet port BL-1 of the Indus-2 ring with a wide solid angle. The large horizontal and vertical angular acceptance contributes to high photon flux and selective polarization respectively. The complete beamline is tested for ultrahigh vacuum (UHV) ? 10{sup ?10} mbar. First absorption spectrum was obtained on HOPG graphite foil. Our performance test indicates that modest resolving power has been achieved with adequate photon flux to carry out various absorption experiments.

Phase, D. M., E-mail: mgupta@csr.res.in; Gupta, Mukul, E-mail: mgupta@csr.res.in; Potdar, S., E-mail: mgupta@csr.res.in; Behera, L., E-mail: mgupta@csr.res.in; Sah, R., E-mail: mgupta@csr.res.in; Gupta, Ajay, E-mail: mgupta@csr.res.in [UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore, 452001 (India)

2014-04-24T23:59:59.000Z

206

VerDate Aug2005 20:03 Dec 27, 2006 Jkt 211001 PO 00000 Frm 00030 Fmt 4703 Sfmt 4703 E:\\FR\\FM\\28DEN1.SGM 28DEN1 srobertsonPROD1PC70withNOTICES  

E-Print Network [OSTI]

Clothes Washers AGENCY: Office of Energy Efficiency and Renewable Energy, Department of Energy. ACTION, December 28, 2006 / Notices 78157 DEPARTMENT OF ENERGY Office of Energy Efficiency and Renewable Energy: Notice of Denial of a Petition for Waiver from Federal Preemption. SUMMARY: The Department of Energy

207

VerDate Aug2005 15:14 Feb 03, 2006 Jkt 208001 PO 00000 Frm 00012 Fmt 4702 Sfmt 4702 E:\\FR\\FM\\06FEP1.SGM 06FEP1 rmajetteonPROD1PC67withPROPOSALS1  

E-Print Network [OSTI]

for Residential Clothes Washers AGENCY: Office of Energy Efficiency and Renewable Energy, Department of Energy] BILLING CODE 3410­02­P DEPARTMENT OF ENERGY Office of Energy Efficiency and Renewable Energy 10 CFR Part'') announces the filing of the California Energy Commission's Petition for Exemption from Federal Preemption

208

VerDate jul2003 15:06 Dec 15, 2003 Jkt 203001 PO 00000 Frm 00057 Fmt 4703 Sfmt 4703 E:\\FR\\FM\\16DEN1.SGM 16DEN1 Federal Register / Vol. 68, No. 241 / Tuesday, December 16, 2003 / Notices 70039  

E-Print Network [OSTI]

(capital/startup): $0. Total Burden Cost (operating/ maintenance): $0. Comments submitted in response, Office of Management, Administration and Planning, Employment Standards Administration. [FR Doc. 03­3] Courier Mail AGENCY: Copyright Office, Library of Congress. ACTION: New procedure for courier

Christian, Eric

209

E-Print Network 3.0 - amelogenin null dental Sample Search Results  

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

- 3 differences (1 Hispanic & 2 Caucasians... ); loss of allele X with NGM while ESXESIIDProPlusSGM+ showed full X,Y No null alleles were detected Source: National...

210

C-A/AP/#244 Pepper Pot Emittance Meter  

E-Print Network [OSTI]

than the ion pulse length. The monochrome video camera, Sony XCD-SX910 with IEEE 1394 digital interface

211

NEW ATRACTUSFROM BRAZILNEW ATRACTUSFROM BRAZIL imens under their care. I am grateful to Jona-  

E-Print Network [OSTI]

):7-14. HOOGMOED,M. S. 1980. Revision of the genus Atrac- tusin Surinam,with the ressurectionof two spe- cies (Colubridae,Reptilia).Notes on the herpe- tofaunaof SurinamVII.Zool. Verhand.175:1-47. McCoY,C.J. 1971 of the genus Atrac- tusin Surinam,with the ressurectionof two spe- cies (Colubridae

Hedges, Blair

212

28 Endowment for Excellence 2010 Report to Donors 29 We are grateful to each  

E-Print Network [OSTI]

Australian Decorative and Fine Arts Society Autism Asperger ACT Dr Gary Bacon Mr Tom Baddeley Mr Brendan Bishop Mr James Black Mrs Dorothy Black Mr Geoff Blake Dr Cecilia Blomstedt Ms Shirley-kay Blue Dr Norman Boardman AO Ms Sue Boettcher Mr Nick Bogiatlis Bootes Foundation Mr Gary Borradale Ms Julie Bos Mr David

Botea, Adi

213

Grating transition radiation: A source of quasimonochromatic radiation P. Henri, O. Haeberle,* and P. Rullhusen  

E-Print Network [OSTI]

and transparent structures are needed such as, e.g., SiO2 aerogels 9 . An alternative technique is based

Boyer, Edmond

214

UNIVERSITY OF CALIFORNIA The Publishers and the Author will be grateful to  

E-Print Network [OSTI]

OF A HISTORY OF THE STEAM-EN- GINE, A MANUAL OF THE STEAM-ENGINE, A MANUAL OF STEAM-BOILERS, ETC., ETC., ETC & SO^S. 43 & 45 EAST NINETEENTH STREET. #12;#12;STEAM-BOILER EXPLOSIONS IN THEORY AND IN PRACTICE. BY R'lNSTRUCTION PUBLIQUE DE FRANCE; PAST PRESIDENT AM. SOC. MECH. ENG*RS J FORMERLY OF U. S. N. ENGINEERS ; AUTHOR

Laughlin, Robert B.

215

Development of Fiber Bragg Grating Strain, Thermal, and Magnetic Sensors for Smart Structure Applications  

E-Print Network [OSTI]

the FBGs along Fiber-2 when moved from air to either IPA orB when the FBG is immersed in IPA from air and evolution ofetched FBG when immersed in IPA and then ferrofluid with a

Emmons, Michael

2012-01-01T23:59:59.000Z

216

Fiber optic temperature sensor using a grating on an angled fiber tip  

E-Print Network [OSTI]

by a DC current source. The sensor was spliced with some more single mode fiber and coupled to the photo detector. The photo detector circuit consisted of an InGaAs 1550nm photodiode along with a trans-impedance circuit to reduce the noise... and amplify the output signal. The output signal was received in a data file using an NI-DAQ interface and a C program (Appendix E). The receiver circuit used with the photodiode is shown in figure 21. 30 2K 2K DC Power Supply 9V Ph oto Dtode 10K OP27...

Varadarajan, Harini

2012-06-07T23:59:59.000Z

217

Sensors and Actuators B 107 (2005) 121125 Two photon fluorescence sensors based on resonant grating  

E-Print Network [OSTI]

Sensors and Actuators B 107 (2005) 121­125 Two photon fluorescence sensors based on resonant the excitation and emission radia- tion reduces the background noise, the static photobleaching.07.040 #12;122 T. Katchalski et al. / Sensors and Actuators B 107 (2005) 121­125 lar, they are compact

Friesem, Asher A.

218

*Support from EPRI, NSF and ORNL for this work is gratefully acknowledged.  

E-Print Network [OSTI]

of Electrical & Computer Engineering IEEE Power & Energy Society (PES) General Meeting Pittsburgh, PA, July 2024 Smart Selfhealing Electric Power Grid #12;Utility construction expendituresUtility construction Hurricane and Earthquake Losses 1900­1989 Flood Losses 1986­1992 Electric Network Outages 1984­2000 101 100

Amin, S. Massoud

219

Comprehensive data reduction package for the Immersion GRating INfrared Spectrograph: IGRINS  

E-Print Network [OSTI]

2014 Available online 10 March 2014 Abstract We present a Python-based data reduction pipeline package correction of the target spectra, the intrinsic hydrogen absorption features of the standard A star pipeline is to provide stable quality of data reduction process with minimal human intervention. The full

Pak, Soojong

220

Synthesis, design and characterization of a distributed feedback grating based non-linear optical chemosensor  

E-Print Network [OSTI]

Current optical chemosensors that operate by a 3R sensing approach - recognize, relay and report -- generate a measurable luminescent signal in the presence of targeted analyte. However, the advancement of chemical sensing ...

Wun, Aetna W. (Aetna Wai-Yue)

2005-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "monochromator sgm gratings" 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

Acknowledgements We are grateful to E. DeGiorgi, H. Matano, L ...  

E-Print Network [OSTI]

where 500 is a harmonic function (unique mod 21rZ) such that ... Throughout the book we assume that d > 0 since the case ..... to the density of superconducting u : G __) R3 (not R2); in the theory of liquid crystals u corresponds to the.

222

Multilayer Phase-Only Diffraction Gratings: Fabrication and Application to EUV Optics  

E-Print Network [OSTI]

Application to Diffractive Optics,” J. Vac. Sci. & Technol.of advanced diffracitve optics,”J. Vac. Sci. & Technol. B,diffusers. ” Applied Optics, 43, 28, 1 (2004). Patrick P.

Salmassi, Farhad; Gullikson, Eric M.; Anderson, Erik H.; Naulleau, Patrick P.

2007-01-01T23:59:59.000Z

223

Investigation of long-period fiber gratings induced by high-intensity femtosecond UV laser pulses  

E-Print Network [OSTI]

,5]. Such UV laser irradiation led to a refractive index change in the Ge-doped fiber core via a single for fiber irradiation [6,7], focused ion- beam radiation [8], and electric arc [9,10]. It was also shown@phys.ucc.ie (D.N. Nikogosyan). Optics Communications 246 (2005) 107­115 www.elsevier.com/locate/optcom #12;most

Nikogosyan, David N.

224

Aminopropyltriethoxysilane (APTES)-functionalized nanoporous polymeric gratings: fabrication and application in biosensing  

E-Print Network [OSTI]

the molecular-recognition events into electrochemical,6 optical,7 acoustic,8 or calorimetric9 signals. Porous that provide a high signal-to-noise ratio. The direct addition of APTES into the photopolymer syrup effectively

225

Force Sensing Robot Fingers using Embedded Fiber Bragg Grating Sensors and Shape Deposition Manufacturing  

E-Print Network [OSTI]

Manufacturing Yong-Lae Park1 , Kelvin Chau2 , Richard J. Black2 and Mark R. Cutkosky1 1 Center for Design deposition manufacturing (SDM) process was explored. The sensorized SDM-fabricated finger mechanoreceptors on its legs [2], in addition to hair sensors, chemical sensors, etc. [1], [26]. Mechanoreceptors

Park, Yong-Lae

226

Fundamental limit of light trapping in grating Zongfu Yu, Aaswath Raman and Shanhui Fan+  

E-Print Network [OSTI]

­305 (1982). 5. M. A. Green, "Lambertian light trapping in textured solar cells and light-emitting diodes. I. Tobías, A. Luque, and A. Marti, "Light intensity enhancement by diffracting structures in solar of nanophotonic light trapping for solar cells," arXiv:1004.2902v2 [physics.optics] (2010). http

Fan, Shanhui

227

Absorption Enhancement in Ultrathin Crystalline Silicon Solar Cells with Antireflection and Light-Trapping Nanocone Gratings  

E-Print Network [OSTI]

Absorption Enhancement in Ultrathin Crystalline Silicon Solar Cells with Antireflection and Light ABSTRACT: Enhancing the light absorption in ultrathin-film silicon solar cells is important for improving in the back reflector. KEYWORDS: Solar cells, light trapping, antireflection, crystalline silicon, absorption

Fan, Shanhui

228

Fingertip Force Control with Embedded Fiber Bragg Grating Sensors Yong-Lae Park1  

E-Print Network [OSTI]

industrial robots with large motors under pulse-width modulated con- trol, in space applications and even}@ifos.com Abstract-- We describe the dynamic testing and control results obtained with an exoskeletal robot finger are useful for contact detection and for control of forces during fine manipulation. The application to force

Park, Yong-Lae

229

Grating-coupled mid-infrared light emission from tensilely strained germanium nanomembranes  

SciTech Connect (OSTI)

Mechanically stressed nanomembranes are used to demonstrate mid-infrared interband light emission from Ge within the 2.1–2.5 ?m atmospheric transmission window. Large biaxial tensile strain is introduced in these samples to convert Ge into a (near-) direct-bandgap semiconductor and to red-shift its luminescence. A diffractive array of Ge pillars is used to outcouple the long-wavelength interband radiation, which is otherwise primarily emitted in the sample plane. An order-of-magnitude strain-induced enhancement in radiative efficiency is also reported, together with the observation of luminescence signatures associated with photonic-crystal cavity modes. These results are promising for the development of silicon-compatible lasers for mid-infrared optoelectronics applications.

Boztug, Cicek; Yin, Jian; Paiella, Roberto, E-mail: rpaiella@bu.edu [Department of Electrical and Computer Engineering and Photonics Center, Boston University, 8 Saint Mary's Street, Boston, Massachusetts 02215 (United States)] [Department of Electrical and Computer Engineering and Photonics Center, Boston University, 8 Saint Mary's Street, Boston, Massachusetts 02215 (United States); Sánchez-Pérez, José R.; Lagally, Max G., E-mail: lagally@engr.wisc.edu [Department of Materials Science and Engineering, University of Wisconsin–Madison, 1509 University Ave., Madison, Wisconsin 53706 (United States)

2013-11-11T23:59:59.000Z

230

Experimental observation of a traveling plasma grating formed by two crossing filaments in gases  

E-Print Network [OSTI]

of atmospheric pollution [3], pulse compression down to few cycle regime [4], triggering and guiding of electric). This laser delivers 15 mJ, 40 fs laser pulses with central wavelength at 800 nm at a repetition rate of 100 crystal is combined with pu

Paris-Sud XI, Université de

231

Dual gratings for enhanced light trapping in thin-film solar cells  

E-Print Network [OSTI]

, Ireland * christian.schuster@york.ac.uk Abstract: Thin film solar cells benefit significantly from; (350.6050) Solar energy. References and links 1. M. A. Green, J. Zhao, A. Wang, and S. R. Wenham, "Progress and outlook for high-efficiency crystalline silicon solar cells," Sol. Energy Mater. Sol. Cells 65

232

Shaping of Thin Grazing-Incidence Reflection Grating Substrates via Magnetorheological Finishing  

E-Print Network [OSTI]

-spatial frequency distortions, such as a single bow traversing the length of the optic, the 2 arcsec limit would. Their low-frequency figure can be improved through thermal slumping to better than 10 arcsec.6, 7 Silicon substrate is desired that remains flat in the absence of external forces. Low bow and low warp wafers still

233

Nonlinear generalized source method for modeling second-harmonic generation in diffraction gratings  

E-Print Network [OSTI]

We introduce a versatile numerical method for modeling light diffraction in periodically patterned photonic structures containing quadratically nonlinear non-centrosymmetric optical materials. Our approach extends the generalized source method to nonlinear optical interactions by incorporating the contribution of nonlinear polarization sources to the diffracted field in the algorithm. We derive the mathematical formalism underlying the numerical method and introduce the Fourier-factorization suitable for nonlinear calculations. The numerical efficiency and runtime characteristics of the method are investigated in a set of benchmark calculations: the results corresponding to the fundamental frequency are compared to those obtained from a reference method and the beneficial effects of the modified Fourier-factorization rule on the accuracy of the nonlinear computations is demonstrated. In order to illustrate the capabilities of our method, we employ it to demonstrate strong enhancement of second-harmonic genera...

Weismann, Martin; Panoiu, Nicolae C

2015-01-01T23:59:59.000Z

234

OH and CH luminescence in opposed flow methane oxy-flames  

SciTech Connect (OSTI)

Emission spectroscopy is a 2-D nonintrusive diagnostic technique that offers spatially resolved data for combustion optimization and control. The UV and visible chemiluminescence of the excited radicals CH(A{sup 2}{delta},B{sup 2}{sigma}{sup -}) and OH(A{sup 2}{sigma}{sup +}) is studied experimentally and numerically in opposed-flow diffusion flames of methane and oxygen-enriched air. The oxidized oxygen content is varied from 21 to 100% while the range of the studied strain rates spans from 20 to 40 s{sup -1}. The spectrally resolved imaging is obtained by two different methods: scattering through a grating monochromator and interposition of interference filters along the optical path. Absolute measured chemiluminescence intensities, coupled with a numerical model based on the opposed flow flame code, are used to evaluate the chemical kinetics of the excited species. The predictions of the selected model are in good agreement with the experimental data over the range of the studied flame conditions. (author)

De Leo, Maurizio; Saveliev, Alexei; Kennedy, Lawrence A. [Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, Chicago, IL 60607 (United States); Zelepouga, Serguei A. [Gas Technology Institute, Des Plaines, IL 60018 (United States)

2007-06-15T23:59:59.000Z

235

STR Loci and Multiplex Kits  

E-Print Network [OSTI]

(1997) · COfiler (1998) · SGM Plus (1999) · Identifiler (2001) · Profiler Plus ID (2001) · SEfiler (2002 16 (2009) · PowerPlex ESX 17 (2009) · PowerPlex ESI 16 (2009) · PowerPlex ESI 17 (2009) · Power

Perkins, Richard A.

236

The onset of optical breakdown in KrF-laser-irradiated silica glass surfaces  

E-Print Network [OSTI]

A synthetic fused silica obtained from Tosoh SGM Co., ESL-1000 (OH % 1200 wt. ppm), with a thick- ness of 2 mmThe onset of optical breakdown in KrF-laser-irradiated silica glass surfaces Y. Kawaguchia,* , A Research Center, National Institute of Advanced Industrial Science and Technology, Tsukuba Central 5, 1

Dickinson, J. Thomas

237

Updated 5/4/2012 W.V.T. RUSCH ENGINEERING HONORS COLLOQUIUM  

E-Print Network [OSTI]

, Treyarch, 3420 Ocean Park Blvd Suite 1000, Santa Monica, CA 90405. 16 Spring Break 23 One EngineerUpdated 5/4/2012 W.V.T. RUSCH ENGINEERING HONORS COLLOQUIUM SPRING 2012 SEMESTER SGM 101, 1:00pm, Associate Professor, Ming Hsieh Department of Electrical Engineering, Viterbi School of Engineering

Zhou, Chongwu

238

1 Copyright 1999 by ASME Proceedings of the  

E-Print Network [OSTI]

SGM, which thereafter employs element-level static condensation for efficiency and nodal, monotone and efficient (SAME) discrete approximate solution is of tremendous interest for convection-rank homogeneity. It is based on a genuinely non-linear, non- hierarchical, high-degree finite element basis

Roy, Subrata

239

Determination of Thermal Diffusivities, Thermal Conductivities, and Sound Speeds of Room-Temperature Ionic Liquids by the Transient Grating Technique  

E-Print Network [OSTI]

Determination of Thermal Diffusivities, Thermal Conductivities, and Sound Speeds of Room. The experiments give thermal diffusivities from which thermal conductivities can be determined, sound speeds not only on the sound speed but also on the thermal diffusivity and acoustic damping of the RTILs

Reid, Scott A.

240

Enhancement of optical absorption in thin-film organic solar cells through the excitation of plasmonic modes in metallic gratings  

E-Print Network [OSTI]

Enhancement of optical absorption in thin-film organic solar cells through the excitation 2010 We theoretically investigate the enhancement of optical absorption in thin-film organic solar.1063/1.3377791 Thin-film organic solar cells OSCs are a promising candidate for low-cost energy conversion.1­6 However

Veronis, Georgios

Note: This page contains sample records for the topic "monochromator sgm gratings" 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

J. Opt. 15 (2013) 085101 (3pp) T Roy et al A meta-diffraction-grating for visible light  

E-Print Network [OSTI]

in the far infrared [5] and near-infrared [7] region of the spectrum while flat lenses designed from optical attracted substantial attention [3-9]. In particular anomalous refraction and reflection has been observed [3-8] are concerned with the infrared part of the spectrum, whereas here we experimentally

Zheludev, Nikolay

2013-01-01T23:59:59.000Z

242

InP-and Graphene-based grating-gated transistors for tunable THz and mm-wave detection  

E-Print Network [OSTI]

layer. Silvaco Atlas 2-D device simulator (FEM analysis software) was used to determine the free carrier

Peale, Robert E.

243

Large area direct nanoimprinting of SiO2 TiO2 gel gratings for optical applications  

E-Print Network [OSTI]

have been known as an economical and quick way to obtain artificial ceramics with engineered properties optical lithography. After exposure, development, electron- beam evaporation of chromium Cr , and lift off

244

Smirnov-SSDLTR2005 Chirped bulk Bragg gratings in PTR glass for ultrashort pulse stretching and compression  

E-Print Network [OSTI]

laser applications boosted the development of optical components capable of withholding high power along with beam transformation. Especially, it related to high power femtosecond pulses where high peak power Arbor, MI 48109-2122 Tel.: (734)615-7166, Fax: (734)763-4876, e-mail: almantas@eecs.umich.edu High power

Glebov, Leon

245

2346 IEEE PHOTONICS TECHNOLOGY LETTERS, VOL. 17, NO. 11, NOVEMBER 2005 Polarization Properties of Long-Period Gratings  

E-Print Network [OSTI]

lasers, optical fiber devices, optical polarization. I. INTRODUCTION THE traditional way to fabricate in a standard telecom fiber based on high-intensity femtosecond UV irradiation. When applying high.857576 [8], [9]. By irradiating the telecom fiber with 352-nm fem- tosecond pulses (third harmonic of our

Nikogosyan, David N.

246

Microsoft PowerPoint - IXD-NSLSII_Poster_Bai  

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

crystal sagittal focusing monochromator (Bottom) IXD beamline layout Catalysis: Water gas shift reaction Real-Time Catalysis: In-Situ Structural Studies for Producing and...

247

Electrocatalysis in Alkaline Electrolytes - Research Overview  

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

Binding Site EXAFS (> 50 eV) * Geometric information * Bond length * Coordination number *BULK short range order Synchrotron Monochromator I o Spectro-electrochemical Cell...

248

E-Print Network 3.0 - approaches neoadjuvant chemotherapy Sample...  

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

of optical spectroscopy in early monitoring of neo-adjuvant... chemotherapy Xenon Arc Lamp + Monochromator Collection Fibers In vivo Breast Tissue Illumination Fibers Imaging...

249

Current Status of the Synchrotron Radiation Center  

SciTech Connect (OSTI)

The Synchrotron Radiation Center (SRC) operates the Aladdin electron storage ring at energies of 800 MeV or 1 GeV in support of a broad range of national and international research programs. A low emittance configuration is in routine operation during 800-MeV shifts and offers improved photon flux density with about the same beam lifetime. An improved undulator compensation algorithm and new optical beam position monitors have been implemented improving beam stability and maintaining vertical beam size variations to < 2% peak-to-peak during undulator scanning. Instrumentation initiatives include construction of a modified Wadsworth beamline (7.8 - 50 eV) and a variable-line-spacing plane-grating monochromator (VLS-PGM, 75 - 2000 eV) to utilize radiation from a permanent magnet undulator. The Wadsworth beamline is being commissioned for photoelectron spectroscopy (PES) experiments using high-resolution Scienta analyzers. The VLS-PGM is being constructed for experiments that require higher photon energies and high flux density such as x-ray photoemission electron microscopy (X-PEEM) and x-ray absorption spectroscopy (XAS). It is scheduled to be available in early 2004. Recent research at the SRC has produced exciting results in a variety of fields, culminating in eight articles published in Physical Review Letters and three in Nature since October 2002, in addition to articles in many other publications. An outreach program offers research experiences for undergraduates and provides the general public with an awareness of synchrotron radiation. Hands-on workshops and activities on FTIR microscopy and X-PEEM are offered for graduate students and scientists. SRC sponsors a summer Research Experience for Undergraduates (REU) program and offers opportunities to non-research universities and high schools. Tours and educational events are coordinated with local civic groups and schools. Open houses are offered that include tours, demonstrations, and family activities.

Kinraide, R.; Moore, C.J.; Jacobs, K.D.; Severson, M.; Bissen, M.J.; Frazer, B.; Bisognano, J.J.; Bosch, R.A.; Eisert, D.; Fisher, M.; Green, M.A.; Gundelach, C.T.; Hansen, R.W.C.; Hochst, H.; Julian, R.L.; Keil, R.; Kleman, K.; Kubala, T.; Legg, R.A.; Pedley, B. [Synchrotron Radiation Center (United States)] [and others

2004-05-12T23:59:59.000Z

250

17 July 2014 Peter M. Vallone, Ph.D.  

E-Print Network [OSTI]

SElect PowerPlex ESI 17 COfiler PowerPlex ES Profiler PowerPlex S5 Profiler Plus PowerPlex Y Profiler Plus ID FFFL SGM Plus SEfiler MiniFiler Yfiler STR Typing kits and Primer Mixes 100% Concordance ESSplex SE RM Y STRs NGM SElect PowerPlex ESI 17 ESSplex SE Plus COfiler PowerPlex ES ESSplex SE GO

251

The effect of footwear and surface conditions on spinal contour and flexibility with constrained standing  

E-Print Network [OSTI]

different foot conditions for periods of four hours on four consecutive days. The floor surfaces used included two types of anti-fatigue mats (Hygenic 1, Ergomat), three types of industrial grating (Metal Grating, Clean Room Grating, Standard Clean Room...

Stephenson, Donya Ann

1995-01-01T23:59:59.000Z

252

"I'm very grateful this program is here, because I would have given up on writing many times along the road."  

E-Print Network [OSTI]

Certificate Program in Construction Management (p. 112) Certificate Program in HVAC (p. 118) EDUCATION Care Act to the latest trends in philanthropy. There's sure to be a topic that intrigues you. Visit pp

Walker, Matthew P.

253

Message from Sophie Prize Winner I am grateful to Jostein Gaarder and the Sophie Foundation for the opportunity to discuss the  

E-Print Network [OSTI]

. Stabilizing climate requires restoring our planet's energy balance. The physics is straightforward. The effect to prove: the United States, Canadian and Norwegian governments are going right ahead developing the tar for the opportunity to discuss the state of Earth's climate, the implications for people and nature, and action

Hansen, James E.

254

Proximity field nanopatterning (PnP) employs a 2D grating to create a 3D optical interferogram within an underlying photore-  

E-Print Network [OSTI]

bandgaps, metamaterials, optical cloaking, highly efficient solar cells, and unique sensors. Significant of optical absorption processes in solar cells, and sensors.[1] Since the pioneering work of Yablonovitch[3 cloaking, solar energy harvesting, and sensing. Central image design by Huigang Zhang. #12;Multidimensional

Rogers, John A.

255

High-resolution grazing-incidence grating spectrometer for temperature measurements of low-Z ions emitting in the 100–300 Å spectral band  

SciTech Connect (OSTI)

We have constructed a high-resolution grazing-incidence spectrometer designed for measuring the ion temperature of low-Z elements, such as Li{sup +} or Li{sup 2+}, which radiate near 199 Å and 135 Å, respectively. Based on measurements at the Livermore Electron Beam Ion Trap we have shown that the instrumental resolution is better than 48 mÅ at the 200 Å setting and better than 40 mÅ for the 135-Å range. Such a high spectral resolution corresponds to an instrumental limit for line-width based temperature measurements of about 45 eV for the 199 Å Li{sup +} and 65 eV for the 135 Å Li{sup 2+} lines. Recently obtained survey spectra from the Lithium Tokamak Experiment at the Princeton Plasma Physics Laboratory show the presence of these lithium emission lines and the expected core ion temperature of approximately 70 eV is sufficiently high to demonstrate the feasibility of utilizing our high-resolution spectrometer as an ion-temperature diagnostic.

Widmann, K., E-mail: widmann1@llnl.gov; Beiersdorfer, P.; Magee, E. W. [Lawrence Livermore National Laboratory, Livermore, California 94550 (United States); Boyle, D. P.; Kaita, R.; Majeski, R. [Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543 (United States)

2014-11-15T23:59:59.000Z

256

This paper presents a state assignment technique to reduce dynamic power consumption in finite state machines (FSM).  

E-Print Network [OSTI]

resulted in a significant interest in energy efficient design. Meanwhile, inte- grated-circuit densities

Pedram, Massoud

257

NM's Flying 40 List Includes CHTM Start-Up By Stefi Weisburd June 23, 2014  

E-Print Network [OSTI]

-ups including Sandia Systems, Inc., Semiconductor Bridge Technology, Gratings, Inc., Zia Laser, Inc., K

New Mexico, University of

258

Subsidizing Solar: The Case for an Environmental Goods and Services Carve-out from the Global Subsidies Regime  

E-Print Network [OSTI]

solar collectors and system controllers, wind- turbine parts and components, stoves, grates and cookers,

Simmons, Zachary Scott

2014-01-01T23:59:59.000Z

259

2/21/11 11:08 AMOregon Quarterly Features Page 1 of 4http://www.oregonquarterly.com/winter2010/feature4.php  

E-Print Network [OSTI]

/feature4.php UO Home | Dept index Winter 2010 | Volume 90, Number 2 Donate to OQ | Past Issues:08 AMOregon Quarterly Features Page 2 of 4http://www.oregonquarterly.com/winter2010/feature4.php monochrome

Richmond, Geraldine L.

260

Ris-R-1211(EN) Development of Optically Stimulated  

E-Print Network [OSTI]

with those obtained in the laboratory using dif- ferent gamma sources and these comparisons show.4 Monochromators and Spectrometry 48 3.5 Development of Single Grain OSL Attachment Systems 55 3.6 Other OSL

Note: This page contains sample records for the topic "monochromator sgm gratings" from the National Library of EnergyBeta (NLEBeta).
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We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

The SLS optics beamline  

E-Print Network [OSTI]

The SLS Optics Beamline U. Flechsig ? , R. Abela ? , R.in the ?eld of x-ray optics and synchrotron radiation in-radiation, beamline optics, channel cut monochromator,

2006-01-01T23:59:59.000Z

262

Zucchini Lasagna Say "Cheese," because this healthy version of a favorite comfort food will  

E-Print Network [OSTI]

garlic, minced n 1 /8 tsp ginger, grated n 1 1 /2 lbs chicken (breasts, drumsticks), skinless 1. Combine

Rau, Don C.

263

Contemporary Mathematics Recent Progress on A-posteriori Error Analysis for the p and  

E-Print Network [OSTI]

, and has inte- grated in many commercial and research codes such as ANSYS, PHLEX, STRESS CHECK, and STRIPE

Guo, Benqi

264

Hyper dispersion pulse compressor for chirped pulse amplification systems  

DOE Patents [OSTI]

A grating pulse compressor configuration is introduced for increasing the optical dispersion for a given footprint and to make practical the application for chirped pulse amplification (CPA) to quasi-narrow bandwidth materials, such as Nd:YAG. The grating configurations often use cascaded pairs of gratings to increase angular dispersion an order of magnitude or more. Increased angular dispersion allows for decreased grating separation and a smaller compressor footprint.

Barty, Christopher P. J. (Hayward, CA)

2011-11-29T23:59:59.000Z

265

REMEMBERING KI HANG KIM This volume is dedicated in memory to Ki Hang Kim, who died in 2009 after  

E-Print Network [OSTI]

, a passport was secured. In December 1953, Kim sailed under the Golden Gate Bridge. Kim was always grateful

Boyle, Mike

266

Optics and Diagnostics  

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

10 14 | Next | Last Back to Index Optics Diffraction Gratings for APPOLON laser. Photo Number: 2011-020040...

267

Crystal Structures of a Plant Trypsin Inhibitor from Enterolobium contortisiliquum (EcTI) and of Its Complex  

E-Print Network [OSTI]

Sciences, under Contract No. W-31- 109-Eng-38. The authors are grateful to Coordenacao de Aperfeicoamento

268

Stereo Fixation using Affine Transfer* Stuart M. Fairley Ian D. Reid David W. Murray  

E-Print Network [OSTI]

Research Studentship to SMF and by a Glasstone Fellowship to IDR. We are extremely grateful for many useful

Murray, David

269

Engineering of a High-Throughput Screening System to Identify Cellulosic Biomass,  

E-Print Network [OSTI]

- grated high-throughput (HTP) screening pipeline. Herein, we report on the engineering of a novel HTP

California at Riverside, University of

270

2007 Nature Publishing Group Self-formation of sub-60-nm half-pitch  

E-Print Network [OSTI]

studies of thin polymer films and termed fracture induced structuring (FIS), self-generates gratings. Specifically, FIS consists of three steps (Fig. 1)12,13. First, a coating of a polymer thin film (for example and cross- sections of FIS gratings. The half-pitch of the FIS grating was found to be as small as 60 nm

271

Texas Tech University Environmental Health and Safety County: Items in italics indicate a requirement for NEW pools/spas only.  

E-Print Network [OSTI]

/Operator: Owner: "X" Indicates a Deficiency: Disinfection-265.197 & 265.181 30. Drinking water available downstream from filter & heater 31. Single Dual 3. Chemicals properly stored & labeled 32. Grate(s): Diagonal required 7. Algae 36. Replacement suction outlet cover/grate(s) on site 8. Water clear ­ main drains

Zhang, Yuanlin

272

Third-order spectral phase compensation in parabolic pulse compression  

E-Print Network [OSTI]

that prisms embedded gratings compressors assert itself as a simple and efficient solution to third on the use of a hybrid compressor system consisting in a set of prisms embedded in a sequence of gratings confirm that, as opposed to traditional gratings compressors, the third-order spectral phase

Boyer, Edmond

273

Advanced polychromator systems for remote chemical sensing (LDRD project 52575).  

SciTech Connect (OSTI)

The objective of this LDRD project was to develop a programmable diffraction grating fabricated in SUMMiT V{trademark}. Two types of grating elements (vertical and rotational) were designed and demonstrated. The vertical grating element utilized compound leveraged bending and the rotational grating element used vertical comb drive actuation. This work resulted in two technical advances and one patent application. Also a new optical configuration of the Polychromator was demonstrated. The new optical configuration improved the optical efficiency of the system without degrading any other aspect of the system. The new configuration also relaxes some constraint on the programmable diffraction grating.

Sinclair, Michael B.; Pfeifer, Kent Bryant; Allen, James Joe

2005-01-01T23:59:59.000Z

274

Auger resonance study for the C1s 2pi* excitation of CO  

E-Print Network [OSTI]

monochromator resolution it is now possible to study the Auger spectra of diatomic molecules such as carbon monoxide (CO) in great detail. Our current study of CO, focuses on the computation of photoionization cross sections for the auger decay of CO after...

Botting, Shaleen Kaye

1997-01-01T23:59:59.000Z

275

Correction of Emission Crosstalk for FRET sensors By Teng-Leong Chew and Rex L. Chisholm  

E-Print Network [OSTI]

1 Correction of Emission Crosstalk for FRET sensors By Teng-Leong Chew and Rex L. Chisholm Excerpt. The superscript "y" can be replaced by "b" to indicate that the monochrome image has been background subtracted. For example: b dF represents a background-subtracted image of the donor fluorophore taken using the FRET

Goldman, Robert D.

276

A Quantitative Analysis of Disk Drive Power Management in Portable Computers  

E-Print Network [OSTI]

the question of power management begins with an analysis of where the energy is being consumed. Table 1 gives) Percent of Total Display Compaq monochrome lite25c 3.5 68% Disk Drive (105 Mbytes) Maxtor MXL­105 III 1 of inactivity. In this paper, we perform a quantitative analysis of the potential costs and benefits of spinning

Anderson, Tom

277

The Development of the GCPCC Protein Crystallography Beamline at CAMD  

E-Print Network [OSTI]

as a simple synchrotron with a bending radius of 0.71 meters. For heat-load calculations, all five wiggler heat load on the first monochromator crystal by acting as a low pass filter. The wavelength is selected. The beamline design, with supporting calculations and ray tracing, is presented to substantiate the expected

Phillips, George N. Jr.

278

Phase plate technology for laser marking of magnetic discs  

DOE Patents [OSTI]

An advanced design for a phase plate enables the distribution of spots in arbitrarily shaped patterns with very high uniformity and with a continuously or near-continuously varying phase pattern. A continuous phase pattern eliminates large phase jumps typically expected in a grating that provides arbitrary shapes. Large phase jumps increase scattered light outside of the desired pattern, reduce efficiency and can make the grating difficult to manufacture. When manufacturing capabilities preclude producing a fully continuous grating, the present design can be easily adapted to minimize manufacturing errors and maintain high efficiencies. This continuous grating is significantly more efficient than previously described Dammann gratings, offers much more flexibility in generating spot patterns and is easier to manufacture and replicate than a multi-level phase grating. 3 figs.

Neuman, B.; Honig, J.; Hackel, L.; Dane, C.B.; Dixit, S.

1998-10-27T23:59:59.000Z

279

Phase plate technology for laser marking of magnetic discs  

DOE Patents [OSTI]

An advanced design for a phase plate enables the distribution of spots in arbitrarily shaped patterns with very high uniformity and with a continuously or near-continuously varying phase pattern. A continuous phase pattern eliminates large phase jumps typically expected in a grating that provides arbitrary shapes. Large phase jumps increase scattered light outside of the desired pattern, reduce efficiency and can make the grating difficult to manufacture. When manufacturing capabilities preclude producing a fully continuous grating, the present design can be easily adapted to minimize manufacturing errors and maintain high efficiencies. This continuous grating is significantly more efficient than previously described Dammann gratings, offers much more flexibility in generating spot patterns and is easier to manufacture and replicate than a multi-level phase grating.

Neuman, Bill (Livermore, CA); Honig, John (Livermore, CA); Hackel, Lloyd (Livermore, CA); Dane, C. Brent (Livermore, CA); Dixit, Shamasundar (Livermore, CA)

1998-01-01T23:59:59.000Z

280

Fast methods for inverse wave scattering problems  

E-Print Network [OSTI]

Inverse wave scattering problems arise in many applications including computerized/diffraction tomography, seismology, diffraction/holographic grating design, object identification from radar singals, and semiconductor ...

Lee, Jung Hoon, Ph. D. Massachusetts Institute of Technology

2008-01-01T23:59:59.000Z

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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

Regular differential and equidimensional scheme-maps  

E-Print Network [OSTI]

I am very grateful to Joe Lipman for going through the cor- rections and to Suresh Nayak for discussions. Nayak had independently discovered the error in the ...

1910-51-01T23:59:59.000Z

282

BONNEVILLE POWER ADMINISTRATION FOR IMMEDIATE RELEASE  

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

and grateful. BPA's setting a high bar in terms of gold certification," says Michael Armstrong, the bureau's research and innovation manager. BPA earned gold certification by...

283

E-Print Network 3.0 - aide tsahkna terje Sample Search Results  

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

are grateful to Professor Terje Hertzberg... , European Symposium on Com- puter Aided Process Engineering pp. 435-442. Kelly, J. D. (2004). Techniques... in computer-aided...

284

AN ADAPTIVE FINITE ELEMENT METHOD FOR THE ...  

E-Print Network [OSTI]

adaptive strategy is established for the diffraction grating problem, such that ...... applications in optical filters and guided mode resonance devices. the ...

2014-05-20T23:59:59.000Z

285

accurate svm-based gene: Topics by E-print Network  

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

Websites Summary: to be cost effective. Index Terms--Computational intelligence system, fuzzy logic, nontechnical loss, pattern- grating human intelligence and knowledge into the...

286

E-Print Network 3.0 - author denis guedj Sample Search Results  

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

NUMBER 5 1 FEBRUARY 1999... an important role in future IV-IV microelectronics and optoelectronics. The authors gratefully acknowledge... . Phys. Lett., Vol. 74, No. 5, 1 February...

287

Mediterranean clonal selections evaluated for modern hedgerow olive oil production in Spain  

E-Print Network [OSTI]

station, Constantí, Catalonia, Spain. We are grateful toBoella farm (La Canonja, Spain) for their collaboration inolive oil production in Spain Paul M. Vossen by Joan Tous,

Tous, Joan; Romero, Agusti; Hermoso, Juan Francisco; Ninot, Antonia

2011-01-01T23:59:59.000Z

288

E-Print Network 3.0 - affecting facility development Sample Search...  

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

R. - Department of Physics and Astronomy, University of Delaware Collection: Physics 7 Panel Feedback and Impact on the PALS Programmatic Recommendations We are grateful to the...

289

advanced human-system interface: Topics by E-print Network  

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

efboll, waeschg Abstract Advanced multimedia applications call for inte- grated DBMS support, i.e., the integrated Boll, Susanne 112 Ultralow thermal conductivity and the...

290

advanced human-system interfaces: Topics by E-print Network  

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

efboll, waeschg Abstract Advanced multimedia applications call for inte- grated DBMS support, i.e., the integrated Boll, Susanne 112 Ultralow thermal conductivity and the...

291

E-Print Network 3.0 - acute hemolytic transfusion Sample Search...  

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

we are grateful to Dr Descazeaud, Summary: is a cornerstone of the management of sickle cell disease but carries a high risk of hemolytic transfusion reaction... and...

292

EveningCollege MSUAlumniAssociation/EveningCollege  

E-Print Network [OSTI]

gratefully acknowledges the following for their generous support: Burcham Hills Retirement Community, East & Recreation Forest Akers Golf Courses Holocaust Memorial Center, Detroit Kellogg Center for Continuing

293

Interior-Point Algorithms for a Generalization of Linear Programming ...  

E-Print Network [OSTI]

Feb 23, 2011 ... Acknowledgement. I am grateful to Eric Denardo for a series of conversations that stimulated my interest in the topic of this paper. 11 ...

2011-02-23T23:59:59.000Z

294

A Geometric Analysis of Renegar's Condition Number, and its ...  

E-Print Network [OSTI]

Apr 11, 2007 ... Furthermore, we believe that the truthfulness of this statement seems reasonably important to ascertain. Acknowledgement. We are grateful to ...

2007-04-11T23:59:59.000Z

295

BCOL RESEARCH REPORT 07.05  

E-Print Network [OSTI]

Acknowledgement. We are grateful to Shabbir Ahmed for thoughtful comments on an earlier version of the paper and discussions on related topics. References.

2008-04-14T23:59:59.000Z

296

Global convergence of trust-region algorithms for constrained ...  

E-Print Network [OSTI]

Sep 27, 2012 ... Acknowledgement. The authors are grateful to José Mario Mart?nez who encouraged them to pursue this investigation and to Luis Mauricio ...

2012-09-27T23:59:59.000Z

297

An novel ADM for finding Cournot equilibria of bargaining problem ...  

E-Print Network [OSTI]

Acknowledgement: We are grateful to Professor He Bingsheng and Professor Yu Jian, for their enlightening of the idea of this paper, and much useful advices to ...

2009-09-26T23:59:59.000Z

298

A Multi-Product Risk-Averse Newsvendor with Exponential Utility ...  

E-Print Network [OSTI]

Apr 5, 2011 ... Acknowledgement. The research was partially supported by the NSF Award CMMI-0965689. The authors are very grateful to three anonymous ...

2011-04-14T23:59:59.000Z

299

On LP Relaxations for the Pattern Minimization Problem  

E-Print Network [OSTI]

Acknowledgement. The authors are grateful to the anonymous Referees whose comments helped improve the quality of this paper. 7. Appendix: from (0) to (2).

2009-06-30T23:59:59.000Z

300

E-Print Network 3.0 - absolute solar transmission Sample Search...  

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

solar telescope. Keywords: EUV, transmission grating... transmission Measurements of DGS solar "white" light ... Source: Didkovsky, Leonid - Space Sciences Center, University of...

Note: This page contains sample records for the topic "monochromator sgm gratings" 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

Contents 1. Introduction  

E-Print Network [OSTI]

Jun 9, 2010 ... sity of Waterloo, when I was on a postdoctoral position there, and I gratefully acknowledge them for providing a splendid working environment.

2010-06-09T23:59:59.000Z

302

E-Print Network 3.0 - annular bragg lasers Sample Search Results  

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

volume Bragg gratings recorded in a photo... temperatures up to 400C, high power laser radiation. Transmitting and ... Source: Glebov, Leon - School of Optics (CREOLE),...

303

ESS 2012 Peer Review - Experimental Investigation of Silicon...  

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

27, 2012 Robert Kaplar, David Hughart, Sandeepan DasGupta, Matthew Marinella, Mark Smith, and Stanley Atcitty The authors gratefully acknowledge the support of Dr. Imre Gyuk...

304

E-Print Network 3.0 - air furnace design Sample Search Results  

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

IN MUNICIPAL INCINERATOR Summary: cal to good furnace performance and to mainten ance of air pollution control. Early in 1967 the writer... of the grate roughly equivalent to...

305

A Schematic Method for Sustainable Material Selection of Toxic Chemicals in Design and Manufacturing  

E-Print Network [OSTI]

in the material selection process for sustainable design andfrom the perspectives of sustainable process design andinte- grated sustainable material selection process of toxic

Yuan, Chris Yingchun; David Dornfeld

2010-01-01T23:59:59.000Z

306

E-Print Network 3.0 - aci american concrete Sample Search Results  

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

Fellow Tarun R. Naik... are gratefully acknowledged. REFERENCES 1. Okamura, H., Self-Compacting High Performance Concrete, ACI Concrete... : Expanding the Possibility of Concrete...

307

E-Print Network 3.0 - antares recoil time-of-flight Sample Search...  

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

imaging... by the matter wave grating by coherently transferring an atom from the condensate into the recoil mode, which Source: Harvard University, Center for Ultracold Atoms,...

308

Test surfaces useful for calibration of surface profilometers  

DOE Patents [OSTI]

The present invention provides for test surfaces and methods for calibration of surface profilometers, including interferometric and atomic force microscopes. Calibration is performed using a specially designed test surface, or the Binary Pseudo-random (BPR) grating (array). Utilizing the BPR grating (array) to measure the power spectral density (PSD) spectrum, the profilometer is calibrated by determining the instrumental modulation transfer.

Yashchuk, Valeriy V; McKinney, Wayne R; Takacs, Peter Z

2013-12-31T23:59:59.000Z

309

JOURNALDE PHYSIQUE IV Colloque C7, supplCment au Journal de Physique 111,Volume 4, juillet 1994  

E-Print Network [OSTI]

Transient surface grating technique for thermal diffusivity measurement M. Alam, R.E.Imhof and B. Zhang transient surface grating technique specifically designed for measuring thermal diffusivities of condensed materials is described. Its capabilities are illustrated with measurements of the thermal diffusivities

Boyer, Edmond

310

Astron. Astrophys. 315, L60L63 (1996) ASTROPHYSICS  

E-Print Network [OSTI]

Physik, Postfach 1603, D-85740 Garching, Germany 3 ISO Science Operations Centre, Astrophysics Division succesfully transferred to the in orbit situation. The achieved accuracies for the grating sections- bration sources were used. Two for each grating section, posi- tioned next to the entrance apertures

Spoon, Henrik

311

Compact wavelength division multiplexers and demultiplexers  

E-Print Network [OSTI]

as in the near infrared are presented. © 2002 Optical Society of America OCIS codes: 050.1970, 050.1950, 050 is based on a planar optics configuration in which several DOEs, each a simple reflection linear grating. The configuration is composed of two identical DOEs, recorded on the same substrate, that act as reflection gratings

Friesem, Asher A.

312

Increasing the output of a Littman-type laser by use of an intracavity Faraday rotator  

E-Print Network [OSTI]

are readily available at a variety of wavelengths from the red to the near infrared. They require their advantages. The sim- pler of the two designs is the Littrow scheme. In this arrangement a reflection grating. The zeroth- order grating reflection is used as the output coupler to extract light from the cavity. Light

Hart, Gus

313

Pour obtenir le grade de DOCTEUR DE L'UNIVERSIT DE GRENOBLE  

E-Print Network [OSTI]

, Fraunhofer Institute Sulzbach-Rosenberg, Président M. Jérôme FAVERGEON Professeur, Université de Technologie gratefully acknowledge funding award of the "Thai-French Innovation Institute (TFII) Excellent Scholarship the course of this study. I would like to gratefully and sincerely thank Dr.Patrick Masset of the Fraunhofer

Paris-Sud XI, Université de

314

Diffractive element in extreme-UV lithography condenser  

DOE Patents [OSTI]

Condensers having a mirror with a diffraction grating in projection lithography using extreme ultra-violet significantly enhances critical dimension control. The diffraction grating has the effect of smoothing the illumination at the camera's entrance pupil with minimum light loss. Modeling suggests that critical dimension control for 100 nm features can be improved from 3 nm to less than about 0.5 nm.

Sweatt, William C. (Albuquerque, NM); Ray-Chaudhurl, Avijit K. (Livermore, CA)

2000-01-01T23:59:59.000Z

315

1 Copyright 2009 by ASME Proceedings of the 17th Annual North American Waste-to-Energy Conference  

E-Print Network [OSTI]

models. On the other hand, full-scale grate models have not been used for examining solid waste mixing these phenomena, a full-scale physical model of the reverse acting grate was built and used for investigating residence time analysis using clay, wood and ceramic spheres in a small-scale model of the reverse acting

316

INSTITUTE OF PHYSICS PUBLISHING MEASUREMENT SCIENCE AND TECHNOLOGY Meas. Sci. Technol. 18 (2007) L1L3 doi:10.1088/0957-0233/18/1/L01  

E-Print Network [OSTI]

was found to be independent of the irradiation intensity which points to a single-quantum mechanism of Bragg grating fabrication under the stated experimental conditions. Keywords: fibre optics, Bragg gratings to the fibre allowed us to vary the UV irradiation intensity. The irradiation intensity was varied between 60

Nikogosyan, David N.

317

Progress in Direct-Drive Inertial Confinement Fusion Research  

E-Print Network [OSTI]

Imploding pellet Expanding blowoff 2. Compression 1. Irradiation 3. Thermonuclear ignition Compressed pellet.5MJ,1~ #12;80 m The OMEGA laser is designed to achieve high irradiation uniformitywithflexiblepulse-beam smoothing is critical to ICF ignition I1771 EO phase modulator Grating Amplifiers Grating Focusing optics

318

ICT publications of Prof. David N. Nikogosyan, made in UCC Two-photon absorption in optical materials  

E-Print Network [OSTI]

-period fiber grating inscription under high- intensity 352 nm femtosecond irradiation: three-photon absorptionICT publications of Prof. David N. Nikogosyan, made in UCC Two-photon absorption in optical.G. Kryukov, E.M. Dianov: Inscription of fiber Bragg gratings by ultraviolet femtosecond radiation. Opt. Lett

Nikogosyan, David N.

319

Evolution and Hydrodynamics of the Very-Broad X-ray Line Emission in SN1987A  

E-Print Network [OSTI]

Observations of SN 1987A by the Chandra High Energy Transmission Grating (HETG) in 1999 and the XMM-Newton Reflection Grating Spectrometer (RGS) in 2003 show very broad (v-b) lines with a full width at half-maximum (FWHM) ...

Dewey, Dan

320

Diffractive element in extreme-UV lithography condenser  

DOE Patents [OSTI]

Condensers having a mirror with a diffraction grating in projection lithography using extreme ultra-violet significantly enhances critical dimension control. The diffraction grating has the effect of smoothing the illumination at the camera's entrance pupil with minimum light loss. Modeling suggests that critical dimension control for 100 nm features can be improved from 3 nm to less than about 0.5 nm.

Sweatt, William C. (Albuquerque, NM); Ray-Chaudhuri, Avijit (Livermore, CA)

2001-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "monochromator sgm gratings" 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

Martin Glynn FICFor SCOPING OF A  

E-Print Network [OSTI]

.ruraldevelopment.org.uk The Forestry Commission gratefully acknowledges the financial support of Renewables East in the preparation of England Region V List of Interviewees Acknowledgement The preparation of this study would not have been and individuals in the region and further afield, to whom the authors gratefully acknowledge their gratitude

322

NSLS-II Experimental Tools (NEXT) Progress Report October 2012  

E-Print Network [OSTI]

the heat load required for the FXI beamline. Figure 3. Measured intensity distribution of the focus cone) was completed for the first collimating mirror subjected to twice the expected maximum heat load (~2.6 k, calculated energy efficiencies for four gratings: 800 l/mm, 600 l/mm, and two 1200 l/mm gratings

Johnson, Peter D.

323

Microfluidic design DOI: 10.1002/smll.200600211  

E-Print Network [OSTI]

Microfluidic design DOI: 10.1002/smll.200600211 Flowing Lattices of Bubbles as Tunable, Self demonstrate tunable, fluidic, two-dimensional diffraction gratings based on a microfluidic platform comprising with a wavelength of 632 nm. Keywords: · bubbles · diffraction gratings · flow focusing · microfluidics · self

Prentiss, Mara

324

SMALL SCALE WASTE-TO-ENERGY TECHNOLOGIES Claudine Ellyin  

E-Print Network [OSTI]

in operation. The investigation included both existing grate combustion plants and novel processes. The Energos grate gasification and combustion technology is currently in operation at six plants in Norway1 SMALL SCALE WASTE-TO-ENERGY TECHNOLOGIES Claudine Ellyin Advisor: Prof. Nickolas J. Themelis

325

CEC4002012006CMF-REV CALIFORNIA ENERGY COMMISSION  

E-Print Network [OSTI]

, PECI, and the Heschong Mahone Group. The authors are grateful to the many people and organizations reflect, to a large extent, the comments made by the many people who took time to carefully review earlier Division for his vision and support of the 2013 Standards. The authors are grateful to the many people

326

CEC-400-2013-001-SD-REV CALIFORNIA ENERGY COMMISSION  

E-Print Network [OSTI]

, and the Heschong Mahone Group. The authors are grateful to the many people and organizations that contributed extent, the comments made by the many people who took time to carefully review earlier versions and support of the 2013 Standards. The authors are grateful to the many people and organizations

327

CEC-400-2013-004-CMF CALIFORNIA ENERGY COMMISSION  

E-Print Network [OSTI]

, PECI, and the Heschong Mahone Group. The authors are grateful to the many people and organizations reflect, to a large extent, the comments made by the many people who took time to carefully review earlier Division for his vision and support of the 2013 Standards. The authors are grateful to the many people

328

CEC-400-2013-004-SD CALIFORNIA ENERGY COMMISSION  

E-Print Network [OSTI]

, PECI, and the Heschong Mahone Group. The authors are grateful to the many people and organizations reflect, to a large extent, the comments made by the many people who took time to carefully review earlier Division for his vision and support of the 2013 Standards. The authors are grateful to the many people

329

CEC-400-2013-002-CMF CALIFORNIA ENERGY COMMISSION  

E-Print Network [OSTI]

, and the Heschong Mahone Group. The authors are grateful to the many people and organizations that contributed extent, the comments made by the many people who took time to carefully review earlier versions and support of the 2013 Standards. The authors are grateful to the many people and organizations

330

CEC-400-2013-001-SD CALIFORNIA ENERGY COMMISSION  

E-Print Network [OSTI]

, and the Heschong Mahone Group. The authors are grateful to the many people and organizations that contributed extent, the comments made by the many people who took time to carefully review earlier versions and support of the 2013 Standards. The authors are grateful to the many people and organizations

331

CEC-400-2013-002-SD CALIFORNIA ENERGY COMMISSION  

E-Print Network [OSTI]

, and the Heschong Mahone Group. The authors are grateful to the many people and organizations that contributed extent, the comments made by the many people who took time to carefully review earlier versions and support of the 2013 Standards. The authors are grateful to the many people and organizations

332

Triangular Profile Imprint Molds in Nanograting Fabrication  

E-Print Network [OSTI]

be applied only to certain crystalline semiconductor materials, and thermal oxidation involves high of the resist uncovered by the evaporated material are removed to expose the underlying substrate using reactive) of the imprinted resist pattern determines the grating line width. Grating duty cycles can be easily tuned from 30

333

Imaging spectrometer wide field catadioptric design  

DOE Patents [OSTI]

A wide field catadioptric imaging spectrometer with an immersive diffraction grating that compensates optical distortions. The catadioptric design has zero Petzval field curvature. The imaging spectrometer comprises an entrance slit for transmitting light, a system with a catadioptric lens and a dioptric lens for receiving the light and directing the light, an immersion grating, and a detector array. The entrance slit, the system for receiving the light, the immersion grating, and the detector array are positioned wherein the entrance slit transmits light to the system for receiving the light and the system for receiving the light directs the light to the immersion grating and the immersion grating receives the light and directs the light through the system for receiving the light to the detector array.

Chrisp; Michael P. (Danville, CA)

2008-08-19T23:59:59.000Z

334

High-efficiency spectral purity filter for EUV lithography  

DOE Patents [OSTI]

An asymmetric-cut multilayer diffracts EUV light. A multilayer cut at an angle has the same properties as a blazed grating, and has been demonstrated to have near-perfect performance. Instead of having to nano-fabricate a grating structure with imperfections no greater than several tens of nanometers, a thick multilayer is grown on a substrate and then cut at an inclined angle using coarse and inexpensive methods. Effective grating periods can be produced this way that are 10 to 100 times smaller than those produced today, and the diffraction efficiency of these asymmetric multilayers is higher than conventional gratings. Besides their ease of manufacture, the use of an asymmetric multilayer as a spectral purity filter does not require that the design of an EUV optical system be modified in any way, unlike the proposed use of blazed gratings for such systems.

Chapman, Henry N. (Livermore, CA)

2006-05-23T23:59:59.000Z

335

REFLECT: A computer program for the x-ray reflectivity of bent perfect crystals  

SciTech Connect (OSTI)

The design of monochromators for x-ray applications, using either standard laboratory sources on synchrotron radiation sources, requires a knowledge of the reflectivity of the crystals. The reflectivity depends on the crystals used, the geometry of the reflection, the energy range of the radiation, and, in the present case, the cylindrical bending radius of the optical device. This report is intended to allow the reader to become familiar with, and therefore use, a computer program called REFLECT which we have used in the design of a dual beam Laue monochromator for synchrotron angiography. The results of REFLECT have been compared to measured reflectivities for both bent Bragg and Laue geometries. The results are excellent and should give full confidence in the use of the program. 6 refs.

Etelaeniemi, V.; Suortti, P.; Thomlinson, W. (Helsinki Univ. (Finland). Dept. of Physics; Brookhaven National Lab., Upton, NY (USA))

1989-09-01T23:59:59.000Z

336

The new very small angle neutron scattering spectrometer at Laboratoire Leon Brillouin  

E-Print Network [OSTI]

The design and characteristics of the new very small angle neutron scattering spectrometer under construction at the Laboratoire Leon Brillouin is described. Its goal is to extend the range of scattering vectors magnitudes towards 2x10{-4} /A. The unique feature of this new spectrometer is a high resolution two dimensional image plate detector sensitive to neutrons. The wavelength selection is achieved by a double reflection supermirror monochromator and the collimator uses a novel multibeam design.

Sylvain Desert; Vincent Thevenot; Julian Oberdisse; Annie Brulet

2007-06-12T23:59:59.000Z

337

High-harmonic XUV source for time- and angle-resolved photoemission spectroscopy  

SciTech Connect (OSTI)

We present a laser-based apparatus for visible pump/XUV probe time- and angle-resolved photoemission spectroscopy (TRARPES) utilizing high-harmonic generation from a noble gas. Femtosecond temporal resolution for each selected harmonic is achieved by using a time-delay-compensated monochromator (TCM). The source has been used to obtain photoemission spectra from insulators (UO{sub 2}) and ultrafast pump/probe processes in semiconductors (GaAs).

Dakovski, Georgi L [Los Alamos National Laboratory; Li, Yinwan [Los Alamos National Laboratory; Durakiewicz, Tomasz [Los Alamos National Laboratory; Rodriguez, George [Los Alamos National Laboratory

2009-01-01T23:59:59.000Z

338

Here is the list of names of people from the class of 1982 for whom we have no contact details. We are aware that sadly some of these people will no longer be alive, but we have not yet had this confirmed. We would be grateful if  

E-Print Network [OSTI]

Van Barthold Pascale Bigley Sian Birch Gillian Ruth Blake Suzanne Janet Carne Kamjin Chan Richard Lesley Williamson Gary Michael Willrad A T Wilson June Anne Wright Parvin Yavari Karen Joy Young #12 Ancient History and Classical Civilisation Paul Gregory Ayres Kim Blake David Neil Cato Kathryn Mary Cole

Li, Yi

339

Large-Area Zone Plate Fabrication with Optical Lithography  

SciTech Connect (OSTI)

Zone plates as condenser optics for x-ray microscopes offer simple optical designs for both illumination and spectral resolution when used as a linear monochromator. However, due to the long write times for electron beam lithography, both the availability and the size of zone plates for condensers have been limited. Since the resolution provided by the linear monochromator scales almost linearly with the diameter of the zone plate, the full potential for zone plate monochromators as illumination systems for x-ray microscopes has not been achieved. For example, the 10-mm-diameter zone plate has demonstrated a spectral resolution of E/{Delta}E = 700[1], but with a 26-mm-diameter zone plate, the calculated spectral resolution is higher than E/{Delta}E = 3000. These large-area zone plates are possible to fabricate with the leading edge semiconductor lithography tools such as those available at the College of Nanoscale Science and Engineering at the University at Albany. One of the lithography tools available is the ASML TWINSCAN XT: 1950i with 37-nm resolution [2]. A single 300-mm wafer can contain more than 60 fields, each with a large area condenser, and the throughput of the tool can be more than one wafer every minute.

Denbeaux, G. [College of Nanoscale Science and Engineering, University at Albany, 255 Fuller Road, Albany, NY 12203 (United States)

2011-09-09T23:59:59.000Z

340

New XAFS spectroscopic investigations in the 1-2 keV region. Final report on LDRD program  

SciTech Connect (OSTI)

Until recently x-ray absorption fine structure (XAFS) measurements in the 1-2 keV region remained a challenging experimental task. This was primarily due to the lack of an adequate monochromator crystal that possessed both the required x-ray properties (large d-spacing, high resolution and reflectivity) and materials properties (ultra-high vacuum (UHV) capability, damage resistance in a synchrotron radiation beam, absence of constituent element absorption edges and stability, both thermal and mechanical). Traditionally, XAFS spectra in this photon energy range have been measured in a piece-wise fashion using a combination of monochromator crystals. Very recently, we have an experimental breakthrough in XAFS spectroscopy in this soft x-ray region. This energy region is of great importance for materials and basic research since the K-edges of Na (1070 eV), Mg (1303 eV), Al (1557 eV) and Si (1839 eV), the L-edges of some 4p elements from Ga to Sr and the M-edges of the rare-earth elements fall within this energy window of the electromagnetic spectrum. YB{sub 66}, a complex binary semiconducting yttrium boride having a cubic crystal structure with a lattice constant of 23.44 {angstrom} has been singled out as a candidate monochromator material for synchrotron radiation in the 1-2 keV region. There is no intrinsic absorption by the constituent elements in this region, which can adequately be dispersed by the (400) reflection having a 2d value of 11.76 {angstrom}. In terms of vacuum compatibility, resistance to radiation damage, thermal and mechanical stability, YB{sub 66} satisfies all the material requirements for use as a monochromator in a synchrotron beam. In the past few years, LLNL in collaboration with a number of other research institutes has pioneered the development of this unique man-made crystal for use as soft x-ray monochromator with synchrotron light sources for materials science studies. 23 refs., 4 figs.

Wong, J.; Froba, M.; Tamura, E.

1996-03-01T23:59:59.000Z

Note: This page contains sample records for the topic "monochromator sgm gratings" 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

Direct detector for terahertz radiation  

DOE Patents [OSTI]

A direct detector for terahertz radiation comprises a grating-gated field-effect transistor with one or more quantum wells that provide a two-dimensional electron gas in the channel region. The grating gate can be a split-grating gate having at least one finger that can be individually biased. Biasing an individual finger of the split-grating gate to near pinch-off greatly increases the detector's resonant response magnitude over prior QW FET detectors while maintaining frequency selectivity. The split-grating-gated QW FET shows a tunable resonant plasmon response to FIR radiation that makes possible an electrically sweepable spectrometer-on-a-chip with no moving mechanical optical parts. Further, the narrow spectral response and signal-to-noise are adequate for use of the split-grating-gated QW FET in a passive, multispectral terahertz imaging system. The detector can be operated in a photoconductive or a photovoltaic mode. Other embodiments include uniform front and back gates to independently vary the carrier densities in the channel region, a thinned substrate to increase bolometric responsivity, and a resistive shunt to connect the fingers of the grating gate in parallel and provide a uniform gate-channel voltage along the length of the channel to increase the responsivity and improve the spectral resolution.

Wanke, Michael C. (Albuquerque, NM); Lee, Mark (Albuquerque, NM); Shaner, Eric A. (Albuquerque, NM); Allen, S. James (Santa Barbara, CA)

2008-09-02T23:59:59.000Z

342

Instrument and method for focusing X-rays, gamma rays and neutrons  

DOE Patents [OSTI]

A crystal diffraction instrument or diffraction grating instrument with an improved crystalline structure or grating spacing structure having a face for receiving a beam of photons or neutrons and diffraction planar spacing or grating spacing along that face with the spacing increasing progressively along the face to provide a decreasing Bragg diffraction angle for a monochromatic radiation and thereby increasing the usable area and acceptance angle. The increased planar spacing for the diffraction crystal is provided by the use of a temperature differential across the crystalline structure, by assembling a plurality of crystalline structures with different compositions, by an individual crystalline structure with a varying composition and thereby a changing planar spacing along its face, and by combinations of these techniques. The increased diffraction grating element spacing is generated during the fabrication of the diffraction grating by controlling the cutting tool that is cutting the grooves or controlling the laser beam, electron beam or ion beam that is exposing the resist layer, etc. It is also possible to vary this variation in grating spacing by applying a thermal gradient to the diffraction grating in much the same manner as is done in the crystal diffraction case.

Smither, Robert K. (Hinsdale, IL)

1984-01-01T23:59:59.000Z

343

Method for producing low and medium BTU gas from coal  

SciTech Connect (OSTI)

A process for producing low and medium BTU gas from carbonizable material is described which comprises: partly devolatizing the material and forming hot incandescent coke therefrom by passing a bed of the same part way through a hot furnace chamber on a first horizontally moving grate while supplying a sub-stoichiometric quantity of air to the same and driving the reactions: C + O/sub 2/ = CO/sub 2/; 2C + O/sub 2/ = 2CO discharging the hot incandescent coke from the end of the first grate run onto a second horizontally moving grate run below the first grate run in the same furnace chamber so as to form a bed thereon, the bed formed on the second grate run being considerably thicker than the bed formed on the first grate run, passing the hot incandescent coke bed on the second grate run further through the furnace chamber in a substantially horizontal direction while feeding air and stream thereto so as to fully burn the coke and in ratio of steam to air driving the following reactions: 2C + O/sub 2/ = 2CO; C + H/sub 2/O = H/sub 2/ + CO; C + 2H/sub 2/O = 2H/sub 2/ + CO/sub 2/; CO + H/sub 2/O = H/sub 2/ + CO/sub 2/ taking off the ash residue of the burned coke and taking off the gaseous products of the reactions.

Mansfield, V.; Francoeur, C.M.

1988-06-07T23:59:59.000Z

344

Instrument and method for focusing x rays, gamma rays, and neutrons  

DOE Patents [OSTI]

A crystal-diffraction instrument or diffraction-grating instrument is described with an improved crystalline structure or grating spacing structure having a face for receiving a beam of photons or neutrons and diffraction planar spacing or grating spacing along that face with the spacing increasing progressively along the face to provide a decreasing Bragg diffraction angle for a monochromatic radiation and thereby increasing the usable area and acceptance angle. The increased planar spacing for the diffraction crystal is provided by the use of a temperature differential across the line structures with different compositions, by an individual crystalline structure with a varying composition and thereby a changing planar spacing along its face, and by combinations of these techniques. The increased diffraction grating element spacing is generated during the fabrication of the diffraction grating by controlling the cutting tool that is cutting the grooves or controlling the laser beam, electron beam, or ion beam that is exposing the resist layer, etc. It is also possible to vary this variation in grating spacing by applying a thermal gradient to the diffraction grating in much the same manner as is done in the crystal-diffraction case.

Smither, R.K.

1982-03-25T23:59:59.000Z

345

Optical Design of a Red Sensitive Spectrograph  

E-Print Network [OSTI]

parallel to each other. It must also not produce a beam that exceeds the size of the grating. For ease of availability, we chose a Shimadzu brand 4 blazed holographic reflective grating that is 50mm square, with 600 lines/mm and a blaze angle of 800nm... Equation 1. We get a minimum collimator diameter of 44.15mm. 1. Grating Size [mm] ? cos(?) = dcoll [mm] Then, we used Equation 2 to solve for the focal length of the collimator (fcoll): 2. dcoll ? f/# = fcoll Here, f/# is 8.8, as dictated...

Martin, Emily 1988-

2012-04-22T23:59:59.000Z

346

Determination of the fracture parameters associated with mixed mode displacement fields and applications of high density geometric moire  

E-Print Network [OSTI]

conducted on both PMMA and aluminum. The analyses of the finite element models indicated that the algorithm developed could be used to determine the opening and shear mode fracture parameters, without being affected by the rigid body rotation... 89 92 C PROCEDURE FOR REPRODUCING 80 LINE/MM GRATINGS . 95 D BONDING THE FILM GRATINGS TO THE TEST SPECIMEN 100 PMMA Aluminum 6061-T6511 E USE OF FILM GRATINGS IN GEOMETRIC MOIRE. . . F USING THE EPIX DIGITAL IMAGING SYSTEM, V2. 6 Set...

Kmiec, Kenneth James

1994-01-01T23:59:59.000Z

347

Radiative heat transfer between two dielectric nanogratings in the scattering approach  

E-Print Network [OSTI]

We present a theoretical study of radiative heat transfer between dielectric nanogratings in the scattering approach. As a comparision with these exact results, we also evaluate the domain of validity of Derjaguin's Proximity Approximation (PA). We consider a system of two corrugated silica plates with various grating geometries, separation distances, and lateral displacement of the plates with respect to one another. Numerical computations show that while the PA is a good approximation for aligned gratings, it cannot be used when the gratings are laterally displaced. We illustrate this by a thermal modulator device for nanosystems based on such a displacement.

J. Lussange; R. Guérout; F. S. S. Rosa; J. -J. Greffet; A. Lambrecht; S. Reynaud

2012-06-01T23:59:59.000Z

348

Multi-channel polarized thermal emitter  

DOE Patents [OSTI]

A multi-channel polarized thermal emitter (PTE) is presented. The multi-channel PTE can emit polarized thermal radiation without using a polarizer at normal emergence. The multi-channel PTE consists of two layers of metallic gratings on a monolithic and homogeneous metallic plate. It can be fabricated by a low-cost soft lithography technique called two-polymer microtransfer molding. The spectral positions of the mid-infrared (MIR) radiation peaks can be tuned by changing the periodicity of the gratings and the spectral separation between peaks are tuned by changing the mutual angle between the orientations of the two gratings.

Lee, Jae-Hwang; Ho, Kai-Ming; Constant, Kristen P

2013-07-16T23:59:59.000Z

349

Scanner position sensor for an integrated laser/film rangefiner  

SciTech Connect (OSTI)

In an integrated laser/FLIR rangefinder a scanner position sensor comprising an LED of the array of LEDs of a forward looking infrared (FLIR) system, a reticle grating located at the image plane of LED optical path and a silicon detector positioned to receive the light passing through the reticle grating for producing a plurality of signals in response to light passing through each grating slot. One of the signals is selected for the synchronization logic for controlling the charging and firing of the laser. If there is no range return a second signal is selected for adjusting the position of the timing pulse.

Berdanier, B. N.

1985-09-24T23:59:59.000Z

350

Optimized 3D simulation method for modeling of out-of-plane radiation in silicon photonic integrated circuits  

E-Print Network [OSTI]

We present an accurate and fast 3D simulation scheme for out-of-plane grating couplers, based on two dimensional rigorous (finite difference time domain) grating simulations, the effective index method (EIM), and the Rayleigh-Sommerfeld diffraction formula. In comparison with full 3D FDTD simulations, the rms difference in electric field is below 5% and the difference in power flux is below 3%. A grating coupler for coupling from a silicon-on-insulator photonic integrated circuit to an optical fiber positioned 0.1 mm above the circuit is designed as example.

Westerveld, W J; Yousefi, M

2015-01-01T23:59:59.000Z

351

Dispersion-compensated Fresnel lens  

DOE Patents [OSTI]

A transmission grating is used to reduce chromatic aberration in a Fresnel lens, wherein the lens chromatic dispersion is offset and substantially canceled by the grating's diffraction-induced dispersion. The grating comprises a Fresnel-type pattern of microscopic facets molded directly into the lens surface. The facets would typically have a profile height of around 4[times]10[sup [minus]5] inch and a profile width of at least 10[sup [minus]3] inch. In its primary intended application, the invention would function to improve the optical performance of a Fresnel lens used to concentrate direct sunlight. 10 figs.

Johnson, K.C.

1992-11-03T23:59:59.000Z

352

Center for Quantum Science and Engineering Weekly Seminar  

E-Print Network [OSTI]

SPEAKER Dr. Chyh-Hong Chern Department of Physics, NTU PLACE Rm716, CCMS & New Physics Building, NTU of up to 0.42 $\\hbar$ can be generated. Based on this effect, a novel device consisting of a grating

Wu, Yih-Min

353

The Economic Impacts of Climate Change: Evidence from Agricultural Output and Random Fluctuations in Weather: Reply  

E-Print Network [OSTI]

Fisher et al. (2012) (hearafter, FHRS) have uncovered coding and data errors in our paper, Deschênes and Greenstone (2007), henceforth, DG. We acknowledge and are embarrassed by these mistakes. We are grateful to FHRS for ...

Deschênes, Olivier

354

E-Print Network 3.0 - air peab alla Sample Search Results  

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

Universit di Roma "La Sapienza" Collection: Mathematics 2 11th North American Waste to Energy Conference Copyright C 2003 by ASME Summary: -cooled grate is compared to that of...

355

Exploring New Technology: Results of the Oak Hill Parkway  

E-Print Network [OSTI]

is especially grateful to Wade Strong of Rodriguez Transportation Group (RTG) and Kelli Reyna of the Texas their time and guidance: · James Williams of TxDOT. · Heather Ashley-Nguyen of TxDOT. · Joseph Carrizales

356

Nitrogen solubility and protein utilization by dairy cows  

E-Print Network [OSTI]

of my problems, and willingness to delegate responsibility throughout my graduate work. Grateful acknowledgment is extended to Dr. E. C. Holt, Dr. T. E. Aitchison, and Professor J. K. Riggs for their advice in this research project. Personal thanks...

El Majdoub, Abdesselam

1977-01-01T23:59:59.000Z

357

THE ASTROPHYSICAL JOURNAL, 487 : 962966, 1997 October 1 1997. The American Astronomical Society. All rights reserved. Printed in U.S.A.  

E-Print Network [OSTI]

grating section established during the performance veriÐcation (PV) phase of ISO has an uncertainty of 0­Planck­Institut fu# r extraterrestrische Physik, Postfach 1603, D­85740 Garching, Germany. 3 ISO Science Operations

358

THE ASTROPHYSICAL JOURNAL, 487:962966, 1997 October 1 1997. The American Astronomical Society. All rights reserved. Printed in U.S.A.(  

E-Print Network [OSTI]

with resolving power R D 30,000. The absolute wavelength calibration of the SWS grating section established, Postfach 1603, D-85740 Garching, Germany. 3 ISO Science Operations Centre, Astrophysics Division of ESA

Spoon, Henrik

359

A climatology of springtime convection systems over the Northwest Gulf of Mexico and adjacent coasts  

E-Print Network [OSTI]

computer assistance. Finally, I would like to deeply thank my husband, Wael Ibrahim, for his constant support, patience, and understanding. I am enormously grateful to my parents, family and friends for their constant encouragement. This research...

Hashem, Magda Sami

1996-01-01T23:59:59.000Z

360

Government Transfers and Political Support  

E-Print Network [OSTI]

de la República, Uruguay andrea@iecon.ccee.edu.uy JanuaryWe are grateful to Uruguay’s Minister for SocialUniversidad de la República (Uruguay), USC, the 2008 CEPR

Manacorda, Marco; Miguel, Edward; Vigorito, Andrea

2009-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "monochromator sgm gratings" 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

E-Print Network 3.0 - albert einstein otto Sample Search Results  

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

Physik 1 (Elementarteilchenphysik) Collection: Physics 5 JOHN EARMAN and CLARK GL YMOUR LOST IN THE TENSORS Summary: , 111. 60680, U.S.A. We are grateful to Dr. Otto...

362

HAAD: A Quick Algorithm for Accurate Prediction of Hydrogen Atoms in Protein Structures  

E-Print Network [OSTI]

. Acknowledgments The authors are grateful to Dr. Andras Szilagyi for reading through the manuscript. Author Contributions Conceived and designed the experiments: LY ZY. Performed the experiments: LY RA. Analyzed the data: LY RA. Contributed reagents/ materials...

Li, Yunqi; Roy, Ambrish; Zhang, Yang

2009-08-20T23:59:59.000Z

363

Low-coherent WDM reflectometry for accurate fiber length monitoring  

E-Print Network [OSTI]

A fiber-optic low-coherent reflectometer was developed to accurately monitor fiber length variation. A large length-coverage range was obtained by using a fiber Bragg grating array in a wavelength-division-multiplexing ...

Hui, Rongqing; Thomas, J.; Allen, Christopher Thomas; Fu, B.; Gao, S.

2003-01-01T23:59:59.000Z

364

Nordisk kernesikkerhedsforskning Norrnar kjarnryggisrannsknir  

E-Print Network [OSTI]

analyses code ABAQUS. The analyses were done for a test pool at Lappeenranta University of Technology. Tech. Martti Vilpas. The authors are grateful to the members of the POOLEX project at the Lappeenranta

365

Nordisk kernesikkerhedsforskning Norrnar kjarnryggisrannsknir  

E-Print Network [OSTI]

test cases and for a test pool at Lappeenranta University of Technology. The Method of Images are grateful to the members of the POOLEX project at the Lappeenranta University of Technology, Mr. Jani Laine

366

Di-l-nitrosyl-bis[(g5 -pentamethylcyclo-  

E-Print Network [OSTI]

for publication: SHELXTL. Support of the REU program CHE-0453206 by the national Science Foundation is gratefully. Version 6.10. Bruker AXS Inc., Madison, Wisconsin, USA. metal-organic compounds m2596 # 2007 International

Coppens, Philip

367

Overeducation in Developing Economies: How can we test for it, and what does it mean?  

E-Print Network [OSTI]

1988, 7(2), pp. 185-94. Hasan, Rana. "Inequality in Asia,"been observed in many countries (Hasan, 2007), is driven byWe are grateful to Rana Hasan and Jewelwayne Cain for help

Mehta, Aashish; Felipe, Jesus; Quising, Pilipinas; Camingue, Shiela

2010-01-01T23:59:59.000Z

368

I-XE ANALYSES OF TAGISH LAKE MAGNETITE AND MONAHANS HALITE. A. Busfield1 , J. D. Gil-  

E-Print Network [OSTI]

- leases were dominated by iodine-derived xenon (129 Xe/132 Xe > 10 consistently). This sample produced of solar sys- tem history. Acknowledgements: We are grateful to R. Wieler for providing the halite grain

Grossman, Lawrence

369

1 Introduction The perception of motion transparency can arise from physically transparent objects,  

E-Print Network [OSTI]

motion transparency processing implements an ecological smoothness constraint Perception, 2006, volume 351 Introduction The perception of motion transparency can arise from physically transparent objects between two perpendicularly moving gratings favors the perception of transparent over coherent motion

Vaina, Lucia M.

370

Narrative, Interpretation, and the Ratification of the Constitution  

E-Print Network [OSTI]

I am grateful to the participants in this forum for their careful and enthusiastic responses to Ratification: The People Debate the Constitution, 1787-1788. Some comments usefully extend the discussion beyond what’s in the ...

Maier, Pauline

371

TOPICS IN RELATIVISTIC HEAVY-ION COLLISIONS  

E-Print Network [OSTI]

1051. M. Sobel, P.J. Siemens, J.P. BondorfandH.A. Bethe,talk at LBL (1979). P. J. Siemens and J. O. Rasmussen,·Phys.Randrup, A. Sandoval, P. Siemens, and J. Symons are grate-

Nagamiya, S.

2010-01-01T23:59:59.000Z

372

Imaging X-ray spectroscopy with micro-X and Chandra  

E-Print Network [OSTI]

High spectral resolution observations of X-ray phenomena have the potential to uncover new physics. Currently, only point sources can be probed with high resolution spectra, using gratings. Extended objects like supernova ...

Rutherford, John (John Morton)

2013-01-01T23:59:59.000Z

373

Proc. Natl. Acad. Sci. USA Vol. 95, pp. 99389943, August 1998  

E-Print Network [OSTI]

, the inner nuclear layer (INL) comprising the nuclei of interneurons and Mu¨ller glial cells photoreceptor cells that fail to mi- grate out of the INL to their normal position in the ONL die in the first 3

Tabin, Cliff

374

‘But it’s Just a Joke!’: Latino Audiences’ Primed Reactions to Latino Comedians and their Use of Race-Based Humor  

E-Print Network [OSTI]

on each other for social support through the ups and downs of graduate school. I am grateful to have cultivated friendships with the following wonderful individuals in particular: Xi Cui, Anisah Kasim, Anirban Mukhopadhyay, Masha Sukovic, Kevin Cosgriff...

Martinez, Amanda

2012-02-14T23:59:59.000Z

375

AUTOMATED RADIO NETWORK DESIGN USING ANT COLONY OPTIMIZATION  

E-Print Network [OSTI]

and guidance. I am very grateful to the Western Transportation Institute (WTI) for extending a graduate to this research. I would like to thank several people at WTI for their help and technical insight, including Bill

Dyer, Bill

376

Motivation Literature Trans. Networks and Emissions Assessment Indices Link Importance Numerical Examples Summary a Environmental Impact Assessment of  

E-Print Network [OSTI]

Examples Summary a Environmental Impact Assessment of Transportation Networks with Degradable Links Environmental Impact Assessment Indices #12;Motivation Literature Trans. Networks and Emissions Assessment is gratefully acknowledged. Anna Nagurney, Qiang Qiang,, Ladimer S. Nagurney Environmental Impact Assessment

Nagurney, Anna

377

Motivation Literature Trans. Networks and Emissions Assessment Indices Link Importance Numerical Examples Summary Environmental Impact Assessment of  

E-Print Network [OSTI]

Examples Summary Environmental Impact Assessment of Transportation Networks with Degradable Links in an Era S. Nagurney Environmental Impact Assessment Indices #12;Motivation Literature Trans. Networks. This support is gratefully acknowledged. Anna Nagurney, Qiang Qiang, Ladimer S. Nagurney Environmental Impact

Nagurney, Anna

378

Simulation of turbulent flames relevant to spark-ignition engines  

E-Print Network [OSTI]

- merous interesting and fruitful discussions. In addition, the comput- ing help I received from Mr Peter Benie and the staff at the Cambridge High Performance Computing Service is gratefully acknowledged. This work would not have been possible without...

Ahmed, Irufan

2014-04-29T23:59:59.000Z

379

E-Print Network 3.0 - anomalous laser light Sample Search Results  

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

anomalous laser light Page: << < 1 2 3 4 5 > >> 1 July 1, 2001 Vol. 26, No. 13 OPTICS LETTERS 989 Waveguide grating mirror for large-area semiconductor lasers Summary: a...

380

Prudent Rationalizability in Generalized Extensive-Form Games  

E-Print Network [OSTI]

Prudent Rationalizability in Generalized Extensive-Form Games Aviad Heifetz Martin Meier Burkhard C/NBER/CEME 2009. Aviad is grateful for financial support from the Open University of Israel's Research Fund grant

Niebur, Ernst

Note: This page contains sample records for the topic "monochromator sgm gratings" 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

Dynamic Unawareness and Rationalizable Behavior  

E-Print Network [OSTI]

Dynamic Unawareness and Rationalizable Behavior Aviad Heifetz Martin Meier Burkhard C. Schipper 2007, LOFT 2008, Games 2008 and NSF/NBER/CEME 2009, and UECE Lisbon 2010. Aviad is grateful

Niebur, Ernst

382

The variability of warm absorbers in Active Galactic Nuclei  

E-Print Network [OSTI]

This thesis presents three studies of warm (photoionized) absorber variability in Active Galactic Nuclei (AGN) using high-resolution X-ray spectra provided by the Chandra High Energy Transmission Grating (HETG). The first ...

Gibson, Robert R. (Robert Ross)

2006-01-01T23:59:59.000Z

383

Development of X-ray lithography and nanofabrication techniques for III-V optical devices  

E-Print Network [OSTI]

This dissertation covers the development of fabrication techniques for Bragg-grating-based integrated optical devices in III-V materials. Work on this rich family of devices has largely been limited to numerical analysis ...

Lim, Michael H. (Michael Hong)

2002-01-01T23:59:59.000Z

384

DYNAMIC CREDIT CORRELATION MODELING C. ALBANESE, O. CHEN, A. DALESSANDRO, AND A. VIDLER  

E-Print Network [OSTI]

. The slow convergence of Monte Carlo methods especially for the purpose of evaluating hedge ratios requires by their employers. We are grateful to Brynjar Arnarrsson, Peter Carr, Mark Davis, William Dellal, Stefano Galiani

Albanese, Claudio

385

X-RAY AND NEAR-INFRARED OBSERVATIONS OF THE OBSCURED ACCRETING PULSAR IGR J18179–1621  

E-Print Network [OSTI]

IGR J18179–1621 is an obscured accreting X-ray pulsar discovered by INTEGRAL on 2012 February 29. We report on our 20 ks Chandra-High Energy Transmission Gratings Spectrometer observation of the source performed on 2012 ...

Paizis, A.

386

USING THE X-RAY DUST SCATTERING HALO OF CYGNUS X-1 TO DETERMINE DISTANCE AND DUST DISTRIBUTIONS  

E-Print Network [OSTI]

We present a detailed study of the X-ray dust scattering halo of the black hole candidate Cygnus X-1 based on two Chandra High Energy Transmission Gratings Spectrometer observations. Using 18 different dust models, including ...

Xiang, Jingen

387

IEEE TRANSACTIONS ON POWER SYSTEMS, VOL. 16, NO. 4, NOVEMBER 2001 935 Discussion of "A Physical-Flow-Based Approach to  

E-Print Network [OSTI]

to Allocating Transmission Losses in a Transaction Framework" George Gross and Shu Tao The authors are grateful, England. Publisher Item Identifier S 0885-8950(01)09812-1. 1G. Gross and S. Fao, IEEE Trans. Power Systems

Gross, George

388

The derivative discontinuity of the exchange–correlation functional  

E-Print Network [OSTI]

of electrons in systems such as batteries and solar cells, chemical reactions in proteins, and transition metal compounds. Acknowledgements We gratefully acknowledge funding from the Royal Society (AJC) and Ramon y Cajal (PMS). PMS also acknowledges grant FIS...

Mori-Sánchez, Paula; Cohen, Aron J.

2014-06-02T23:59:59.000Z

389

arms spectrometric channel: Topics by E-print Network  

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

the SPDC output and to create an effective non-Markovian environment. Modulation of the enviroment spectrum is obtained by inserting a spatial grating on the signal arm. In our...

390

Technological assessment of light-trapping technology for thin-film Si solar cell  

E-Print Network [OSTI]

The proposed light trapping technology of Distributed Bragg Reflector (DBR) with Diffraction Grating (DG) and Anti-Reflection Coating (ARC) for thin film Si solar cell was analyzed from the technology, market, and ...

Susantyoko, Rahmat Agung

2009-01-01T23:59:59.000Z

391

Integrated photonic structures for light trapping in thin-film Si solar cells  

E-Print Network [OSTI]

We explore the mechanisms for an efficient light trapping structure for thin-film silicon solar cells. The design combines a distributed Bragg reflector (DBR) and periodic gratings. Using photonic band theories and numerical ...

Sheng, Xing

392

Lesson Summary In this lesson, students will build an open spectrograph to  

E-Print Network [OSTI]

lines/mm or 25,400 groves/in) · Incandescent flashlight with focusing beam · Ruler · Meter stick · Exact students look through a diffraction grating toward an incandescent light bu

Mojzsis, Stephen J.

393

Modeling the high resolution X-ray spectra from the relativistic jets of the X-ray binary SS 433  

E-Print Network [OSTI]

We test the physical model of the relativistic jets in the galactic X-ray binary SS 433 that was proposed by Marshall et al. 2002 (Paper I) using additional observations from the Chandra High Energy Transmission Grating ...

Lopez, Laura Ann, 1982-

2004-01-01T23:59:59.000Z

394

Pyrosequencing Reveals High-Temperature Cellulolytic Microbial Consortia in Great Boiling Spring after In Situ  

E-Print Network [OSTI]

; and the Joint Genome Institute at the DOE (CSP-182). The authors are grateful for support from Greg Fullmer ``first-generation'' biofuel technology, rely on fermentable sugars from plants traditionally utilized

Ahmad, Sajjad

395

aggase2 parametric oscillator: Topics by E-print Network  

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

the SPDC output and to create an effective non-Markovian environment. Modulation of the enviroment spectrum is obtained by inserting a spatial grating on the signal arm. In our...

396

A Flow-Through Ultrasonic Lysis System for the Disruption of...  

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

the Disruption of Bacterial Spores."JALA. Journal of the Association for Laboratory Automation 14(5):277-284. Authors: CL Warner CJ Bruckner-Lea JW Grate TM Straub GJ Posakony NB...

397

Department of Communication Systems Lund Institute of Technology  

E-Print Network [OSTI]

for the degree of Licentiate in Engineering. #12;Abstract A major problem when using software platforms to a licentiate degree. I am also very grateful to Dr. Martin Höst for his mentoring and friendship. His sincere

398

Learning with Heterogeneous Expectations in an Evolutionary World  

E-Print Network [OSTI]

postdoctoral fellow at the Research Unit on Economic Structures and Growth (RUESG), Department of Economics, University of Helsinki. Financial support from the Academy of Finland, Yrjö Jahnsson Foundation, Bank of Finland and Nokia Group is gratefully...

Guse, Eran A

2006-03-14T23:59:59.000Z

399

Optically transduced MEMS gyro device  

DOE Patents [OSTI]

A bulk micromachined vibratory gyro in which a proof mass has a bulk substrate thickness for a large mass and high inertial sensitivity. In embodiments, optical displacement transduction is with multi-layer sub-wavelength gratings for high sensitivity and low cross-talk with non-optical drive elements. In embodiments, the vibratory gyro includes a plurality of multi-layer sub-wavelength gratings and a plurality of drive electrodes to measure motion of the proof mass induced by drive forces and/or moments and induced by the Coriolis Effect when the gyro experiences a rotation. In embodiments, phase is varied across the plurality gratings and a multi-layer grating having the best performance is selected from the plurality.

Nielson, Gregory N; Bogart, Gregory R; Langlois, Eric; Okandan, Murat

2014-05-20T23:59:59.000Z

400

E-Print Network 3.0 - argona work package Sample Search Results  

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

49, dkembre 1988 Summary: , Argonae National Laboratory, Argonne, Illinois 60459, U.S.A. Abstract. - The Hall coefficient of Ce, U... We are grateful to Professor K. Ueda for a...

Note: This page contains sample records for the topic "monochromator sgm gratings" 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

External-cavity designs for phase-coupled laser diode arrays  

E-Print Network [OSTI]

We describe passive phase-locking architectures based on external-cavity setups to improve the brightness of diode laser bars. Volume Bragg gratings are used to stabilize the lase line. Numerical modelling and experimental results will be presented.

Lucas-Leclin, Gaelle; Georges, Patrick; Michel, Nicolas; Calligaro, Michel; Krakowski, Michel; Lim, Jun; Sujecki, Slawomir; Larkins, Eric

2010-01-01T23:59:59.000Z

402

Linking Institutional Characteristics to Communal Natural Resource Conservation in Cumbres de Monterrey National Park  

E-Print Network [OSTI]

by the Springfield Research Award was instrumental in completing this research, for which I am very grateful. ix NOMENCLATURE SEMERNAT Secretary of the Environment and Natural Resources Secretaría de Medio Ambiente y Recursos Naturales PROCEDE National...

Clifton, Kathryn Marie

2014-05-08T23:59:59.000Z

403

Photopatterned polyacrylamide gels enable efficient microfluidic assays  

E-Print Network [OSTI]

no prior experience in microfluidics or bioMEMS; in fact, Iwhich was and still is microfluidics. I am forever grateful8 or paper 9 . Digital microfluidics utilize surface tension

Hou, Chenlu

2011-01-01T23:59:59.000Z

404

Analysis and Control of Batch Order Picking Processes Considering Picker Blocking  

E-Print Network [OSTI]

passion for engineering research and their leadership in advanced education. I am grateful to Dr. Sergiy Butenko and Dr. Vivek Sarin for their advice and suggestions during the writing of this dissertation. I also thank Dr. Banerjee for our...

Hong, Soon Do

2011-10-21T23:59:59.000Z

405

Motion thresholds can be predicted from contrast discrimination  

E-Print Network [OSTI]

and flicker thresholds for suprathreshold sinusoidal gratings are similar. This finding sup- ports the idea are slightly higher than jitter thresholds indicates that the contrast gain control (or satu- rating energy

Klein, Stanley

406

Electronic modulation of infrared emissivity in graphene plasmonic Victor W. Brar *&, Michelle C. Sherrott *#, Luke A. Sweatlock ~#,  

E-Print Network [OSTI]

included the patterned gratings on metal or silicon carbide surfaces,[1, 2] size-tunable Mie resonances,[3 with strongly temperature dependent emissivity, such as VOx in the vicinity of its solid state phase transition

Atwater, Harry

407

A Simulation Framework for Design of Mixed Time/Event-Triggered Distributed Control Systems  

E-Print Network [OSTI]

not fit into the strict periodic framework [13]. These CPS control systems often consist of both TT and ET- grate, and simulate all parts together is essential for design space exploration during early

Koutsoukos, Xenofon D.

408

Relationships Among Passivity, Positive Realness, and Dissipativity with an Application to Passivity Based  

E-Print Network [OSTI]

of the National Science Foundation under the CPS Large Grant No. CNS-1035655 is gratefully acknowledged. 1 #12 essential property of dynamical systems, that is, a system with this property does not generate its own

Antsaklis, Panos

409

B-RPM: An Efficient One-to-Many Communication Framework for On-Chip Networks  

E-Print Network [OSTI]

. I am also grateful to all my High Performance Computing group colleagues, especially Lei Wang, Minseon Ahn, Hyunjun Jang, Baik Song An, Jagadish Chandar and Rahul Boyapati. I appreciate their time and effort which helped me in getting over...

Shaukat, Noman

2012-10-19T23:59:59.000Z

410

Design and fabrication of high-index-contrast self-assembled texture for light extraction enhancement in LEDs  

E-Print Network [OSTI]

We developed a high-index-contrast photonic structure for improving the light extraction efficiency of light-emitting diodes (LEDs) by a self-assembly approach. In this approach, a two-dimensional grating can be ...

Sheng, Xing

411

Dispersion compensation in chirped pulse amplification systems  

DOE Patents [OSTI]

A chirped pulse amplification system includes a laser source providing an input laser pulse along an optical path. The input laser pulse is characterized by a first temporal duration. The system also includes a multi-pass pulse stretcher disposed along the optical path. The multi-pass pulse stretcher includes a first set of mirrors operable to receive input light in a first plane and output light in a second plane parallel to the first plane and a first diffraction grating. The pulse stretcher also includes a second set of mirrors operable to receive light diffracted from the first diffraction grating and a second diffraction grating. The pulse stretcher further includes a reflective element operable to reflect light diffracted from the second diffraction grating. The system further includes an amplifier, a pulse compressor, and a passive dispersion compensator disposed along the optical path.

Bayramian, Andrew James; Molander, William A.

2014-07-15T23:59:59.000Z

412

Address: Department of Physics, Faculty of Science, Ain Shams University, Abbassia, Cairo 11566, Egypt -Tel: +202-2466-5630 -Fax: +202-2466-2917 -www.science-ainshams.com  

E-Print Network [OSTI]

, Egypt - Tel: +202-2466-5630 - Fax: +202-2466-2917 - www.science-ainshams.com March 13, 2013 Dr. Sultana, Egypt is gratefully acknowledging the receipt of the following books for the undergraduate astronomy

Nahar, Sultana Nurun

413

Perception & Psychophysics 2001, 63 (8), 1421-1455  

E-Print Network [OSTI]

. I am especially grateful for the many wonderful suggestions and comments that I have had from David Foster, Lew Harvey, Christian Kaernbach, Marjorie Leek, Neil Macmillan, Jeff Miller, Hans Strasburger

Klein, Stanley

414

Air transportation in the 1980's, and the role of IATA : address :  

E-Print Network [OSTI]

"(Ladies &) Gentlemen, I am grateful for this opportunity to talk to you about the developing scene in the civil air transport industry. And to take a look at the evolving role of IATA - the International Air Transport ...

Hammarskjl?d, Knut

1980-01-01T23:59:59.000Z

415

Herbicide Update Ian Willoughby and David Clay  

E-Print Network [OSTI]

for the rain- fastness trials is gratefully acknowledged. The Highways Agency funded the coppice regrowth work Glyphosate rain-fastness 8 Control of coppice regrowth 10 3. Regulatory changes 11 Definitions of situations

416

Example Operating, Design and Installation factors give a maximuExample Operating, Design and Installation factors give a maximu mm deviation of 30% and a minimum of 0%deviation of 30% and a minimum of 0%  

E-Print Network [OSTI]

Support for research at Kurata Thermodynamic Laboratory by Occidental Oil and Gas Foundation is gratefully Vessels · Tanks ChemCAD METHODOLOGY · Literature-based · Modular approach · Adjustments for type, material

Howat, Colin S. "Chip"

417

Visual motion modulates pattern sensitivity ahead, behind, and beside Derek H. Arnold a,  

E-Print Network [OSTI]

; De Valois & De Valois, 1991; Maus & Nijhawan, 2009; Nijhawan, 1994, 2008; Nijhawan & Wu, 2009; Roach evidence was revealed by an interaction between adjacent moving gratings (Roach, McGraw, & Johnston, 2011

Whitney, David

418

OptCom: A Multi-Level Optimization Framework for the Metabolic Modeling and Analysis of Microbial  

E-Print Network [OSTI]

production of biofuels [2,3], biodegradation and natural attenuation of pollutants [4,5,6], bacterially gratefully acknowledge funding from the DOE (http://www.energy.gov/) grant DE-FG02-05ER25684. The funders had

Maranas, Costas

419

Invitation to our Design Trade Show Managing New Product Design: Design Theory and Methods  

E-Print Network [OSTI]

disciplines from UC Berkeley and the Autonomous University of Mexico City (UNAM are grateful for our coaches this year, including representatives of 44 Energy and productivity and is sponsored by theDesignExchange. 4. Bevolution - A sustainable, user

Agogino, Alice M.

420

Evaluation of poly (ADP-ribose) polymerase inhibitor ABT-888 combined with radiotherapy and temozolomide in glioblastoma  

E-Print Network [OSTI]

ADPr immunofluorescence quantification and data interpretation. KJK was involved in the study coordination and drafting of the manuscript. All authors read and approved the final manuscript. Acknowledgements We are grateful to the Royal Surrey County Hospital...

Barazzuol, Lara; Jena, Raj; Burnet, Neil G; Meira, Lisiane B; Jeynes, Jonathan C G; Kirkby, Karen J; Kirkby, Norman F

2013-03-19T23:59:59.000Z

Note: This page contains sample records for the topic "monochromator sgm gratings" 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

Optical characterization of complex mechanical and thermal transport properties  

E-Print Network [OSTI]

Time-resolved impulsive stimulated light scattering (ISS), also known as transient grating spectroscopy, was used to investigate phonon mediated thermal transport in semiconductors and mechanical degrees of freedom linked ...

Johnson, Jeremy A. (Jeremy Andrew)

2011-01-01T23:59:59.000Z

422

--No Title--  

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

area. "We are so grateful to those who helped make our campaign such a success," said Mary Lou Whitten, 1997 General Campaign chair. "It is a remarkable tribute to the people...

423

Limits on Hot Galactic Halo Gas from X-ray Absorption Lines  

E-Print Network [OSTI]

Although the existence of large-scale hot gaseous halos around massive disk galaxies has been theorized for a long time, there is yet very little observational evidence. We report the Chandra and XMM-Newton grating spectral ...

Yao, Yangsen

424

HOW TO COOK By Kathryn l. O sterhaug and Ro G. K rr  

E-Print Network [OSTI]

;~ cup catsup ti tablespoons lemon juice 1 tablespoon horseradish 3 drops tabasco sauce Yz teaspoon grated onion 1 teaspoon Worcestershire sauce 3 drops tabasco sauce 2 teaspoons lemon juice 1 teaspoon

425

Modeling and experimental studies of oxide covered metal surfaces: TiO{sub 2}/Ti a model system. Progress report  

SciTech Connect (OSTI)

Prior work in our laboratories at the Corrosion Research Center has shown that thin, anodic TiO{sub 2} films formed by the Slow Growth Mode (SGM) on polycrystalline titanium and microcrystalline with a texture that varies from one metal grain to another. Furthermore, the underlying metal grains are mapped by the photoelectrochemical response of the oxide. The same characteristics have also been demonstrated in our laboratory for ZnO grown on Zn. The TiO{sub 2}/Ti system has been chosen for study both because of its importance in energy systems, and because it can serve as a model system for other metal-metal oxide couples. The investigations of anodic TiO{sub 2} films on Ti have shown that the properties of thin films are consistent with the rutile form of the oxide. Both experimental data and theoretical calculations show the close resemblance to results on single crystal TiO{sub 2}. Furthermore, the modeling studies reveal that the optical transitions near the bandedge arise from the bulk band structure. The photoelectrochemical properties of anodic TiO{sub 2} films have now been shown to obey the simple Gaertner-Butler model for the semiconductor-electrolyte interface, with a few modifications. The most important deviation has now been shown to be a result of multiple internal reflections in the oxide film.

Smyrl, W.H.

1991-12-31T23:59:59.000Z

426

Modeling and experimental studies of oxide covered metal surfaces: TiO sub 2 /Ti a model system  

SciTech Connect (OSTI)

Prior work in our laboratories at the Corrosion Research Center has shown that thin, anodic TiO{sub 2} films formed by the Slow Growth Mode (SGM) on polycrystalline titanium and microcrystalline with a texture that varies from one metal grain to another. Furthermore, the underlying metal grains are mapped by the photoelectrochemical response of the oxide. The same characteristics have also been demonstrated in our laboratory for ZnO grown on Zn. The TiO{sub 2}/Ti system has been chosen for study both because of its importance in energy systems, and because it can serve as a model system for other metal-metal oxide couples. The investigations of anodic TiO{sub 2} films on Ti have shown that the properties of thin films are consistent with the rutile form of the oxide. Both experimental data and theoretical calculations show the close resemblance to results on single crystal TiO{sub 2}. Furthermore, the modeling studies reveal that the optical transitions near the bandedge arise from the bulk band structure. The photoelectrochemical properties of anodic TiO{sub 2} films have now been shown to obey the simple Gaertner-Butler model for the semiconductor-electrolyte interface, with a few modifications. The most important deviation has now been shown to be a result of multiple internal reflections in the oxide film.

Smyrl, W.H.

1991-01-01T23:59:59.000Z

427

Return to 1990: The cost of mitigating United States carbon emissions in the post-2000 period  

SciTech Connect (OSTI)

The Second Generation Model (SGM) is employed to examine four hypothetical agreements to reduce emissions in Annex 1 nations (OECD nations plus most of the nations of Eastern Europe and the former Soviet Union) to levels in the neighborhood of those which existed in 1990, with obligations taking effect in the year 2010. The authors estimate the cost to the US of complying with such agreements under three distinct conditions: no trading of emissions rights, trading of emissions rights only among Annex 1 nations, and a fully global trading regime. The authors find that the marginal cost of returning to 1990 emissions levels in the US in the absence of trading opportunities is approximately $108 per metric ton carbon in 2010. The total cost in that year is approximately 0.2% of GDP. International trade in emissions permits lowers the cost of achieving any mitigation objective by equalizing the marginal cost of carbon mitigation among countries. For the four mitigation scenarios in this study, economic costs to the US remain below 1% of GDP through at least the year 2020.

Edmonds, J.A.; Kim, S.H.; MacCracken, C.N.; Sands, R.D.; Wise, M.A.

1997-10-01T23:59:59.000Z

428

Carbon taxes and India  

SciTech Connect (OSTI)

Using the Indian module of the Second Generation Model 9SGM, we explore a reference case and three scenarios in which greenhouse gas emissions were controlled. Two alternative policy instruments (carbon taxes and tradable permits) were analyzed to determine comparative costs of stabilizing emissions at (1) 1990 levels (the 1 X case), (2) two times the 1990 levels (the 2X case), and (3) three times the 1990 levels (the 3X case). The analysis takes into account India`s rapidly growing population and the abundance of coal and biomass relative to other fuels. We also explore the impacts of a global tradable permits market to stabilize global carbon emissions on the Indian economy under the following two emissions allowance allocation methods: (1) {open_quotes}Grandfathered emissions{close_quotes}: emissions allowances are allocated based on 1990 emissions. (2) {open_quotes}Equal per capita emissions{close_quotes}: emissions allowances are allocated based on share of global population. Tradable permits represent a lower cost method to stabilize Indian emissions than carbon taxes, i.e., global action would benefit India more than independent actions.

Fisher-Vanden, K.A.; Pitcher, H.M.; Edmonds, J.A.; Kim, S.H. [Pacific Northwest Lab., Richland, WA (United States); Shukla, P.R. [Indian Institute of Management, Ahmedabad (India)

1994-07-01T23:59:59.000Z

429

Development of laser diode sources for small-size Ca optical frequency standards  

SciTech Connect (OSTI)

Wavelength (frequency) tuning, coverage, and linewidth reduction characteristics of a visible laser diode (LD) operating near 656 run at room temperature were investigated by using optical feedback from Littrow-type grating (LG). Frequency tuning coefficients on the grating angle, LD temperature, and injection current were found to be 1 THz/degree, 32.39 GHz/K, and 6.15 GHz/mA, respectively, using a InGaAsP visible laser diode.

Yoon, Tai Hyun; Suh, Ho Suhng; Chung, Myung Sai [Korea Research Institute of Standards and Science, Taejon (Korea, Republic of)] [and others

1994-12-31T23:59:59.000Z

430

Spectral characteristics of a laser emitter designed for pumping and detecting a reference quantum transition of a caesium frequency standard  

SciTech Connect (OSTI)

Experimental and calculated spectral characteristics of a diode laser with a Bragg grating soldered on a thermoelectric cooler are presented. A model of the laser is developed, which takes into account the pressure arising after soldering the Bragg grating on the thermoelectric cooler, as well as temperature and dispersion. Theoretical and experimental spectral characteristics of the laser are compared and their satisfactory agreement is shown. (control of radiation parameters)

Ivanov, A V; Kurnosov, V D; Kurnosov, K V; Romantsevich, V I; Chernov, Roman V; Marmalyuk, Aleksandr A; Volkov, N A; Zholnerov, V S

2011-08-31T23:59:59.000Z

431

Measuring short electron bunch lengths using coherent Smith-Purcell radiation  

DOE Patents [OSTI]

A method is provided for directly determining the length of sub-picosecond electron bunches. A metallic grating is formed with a groove spacing greater than a length expected for the electron bunches. The electron bunches are passed over the metallic grating to generate coherent and incoherent Smith-Purcell radiation. The angular distribution of the coherent Smith-Purcell radiation is then mapped to directly deduce the length of the electron bunches. 8 figs.

Nguyen, D.C.

1999-03-30T23:59:59.000Z

432

Real time monitoring of superparamagnetic nanoparticle self-assembly on surfaces of magnetic recording media  

SciTech Connect (OSTI)

Nanoparticle self-assembly dynamics are monitored in real-time by detecting optical diffraction from an all-nanoparticle grating as it self-assembles on a grating pattern recorded on a magnetic medium. The diffraction efficiency strongly depends on concentration, pH, and colloidal stability of nanoparticle suspensions, demonstrating the nanoparticle self-assembly process is highly tunable. This metrology could provide an alternative for detecting nanoparticle properties such as colloidal stability.

Ye, L.; Pearson, T.; Crawford, T. M., E-mail: crawftm@mailbox.sc.edu [Department of Physics and Astronomy, University of South Carolina, 712 Main Street, Columbia, South Carolina 29208 (United States); Qi, B.; Cordeau, Y.; Mefford, O. T. [Department of Materials Science and Engineering, Clemson University, 161 Sirrine Hall, Clemson, South Carolina 29634 (United States); Center for Optical Materials Science and Engineering Technologies (COMSET), 91 Technology Dr., Anderson, South Carolina 29625 (United States)

2014-05-07T23:59:59.000Z

433

Embedded ultrasound sensor in a silicon-on-insulator photonic platform  

SciTech Connect (OSTI)

A miniaturized ultrasound sensor is demonstrated in a silicon-on-insulator platform. The sensor is based on a ?-phase-shifted Bragg grating formed by waveguide corrugation. Ultrasound detection is performed by monitoring shifts in the resonance frequency of the grating using pulse interferometry. The device is characterized by measuring its response to a wideband acoustic point source generated using the optoacoustic effect. Experimental results show that the sensor's response is dominated by the formation of surface acoustic waves.

Rosenthal, Amir; Omar, Murad; Estrada, Héctor; Kellnberger, Stephan; Razansky, Daniel; Ntziachristos, Vasilis [Institute for Biological and Medical Imaging (IBMI), Technische Universität München and Helmholtz Zentrum München, Ingoldstädter Landstraße 1, 85764 Neuherberg (Germany)

2014-01-13T23:59:59.000Z

434

Measuring short electron bunch lengths using coherent smith-purcell radiation  

DOE Patents [OSTI]

A method is provided for directly determining the length of sub-picosecond electron bunches. A metallic grating is formed with a groove spacing greater than a length expected for the electron bunches. The electron bunches are passed over the metallic grating to generate coherent and incoherent Smith-Purcell radiation. The angular distribution of the coherent Smith-Purcell radiation is then mapped to directly deduce the length of the electron bunches.

Nguyen, Dinh C. (Los Alamos, NM)

1999-01-01T23:59:59.000Z

435

Apparatus for injecting high power laser light into a fiber optic cable  

DOE Patents [OSTI]

High intensity laser light is evenly injected into an optical fiber by the combination of a converging lens and a multisegment kinoform (binary optical element). The segments preferably have multi-order gratings on each which are aligned parallel to a radial line emanating from the center of the kinoform and pass through the center of the element. The grating in each segment causes circumferential (lateral) dispersion of the light, thereby avoiding detrimental concentration of light energy within the optical fiber.

Sweatt, William C. (Albuquerque, NM)

1997-01-01T23:59:59.000Z

436

Tunable Radiation Source by Coupling Laser-Plasma-Generated Electrons to a Periodic Structure  

SciTech Connect (OSTI)

Near-infrared radiation around 1000 nm generated from the interaction of a high-density MeV electron beam, obtained by impinging an intense ultrashort laser pulse on a solid target, with a metal grating is observed experimentally. Theoretical modeling and particle-in-cell simulation suggest that the radiation is caused by the Smith-Purcell mechanism. The results here indicate that tunable terahertz radiation with tens GV/m field strength can be achieved by using appropriate grating parameters.

Jin, Z. [Photon Pioneers Center, Osaka University, 2-1 Yamada-oka, Suita, Osaka, 565-0871 (Japan); Chen, Z. L.; Kon, A.; Nakatsutsumi, M. [Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka, 565-0871 (Japan); Zhuo, H. B. [Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka, 565-0871 (Japan); School of Science, National University of Defense Technology, Changsha 410073 (China); Wang, H. B.; Zhang, B. H.; Gu, Y. Q.; Wu, Y. C.; Zhu, B.; Wang, L. [National Key Laboratory of Laser Fusion, CAEP, Mianyang 621900 (China); Yu, M. Y. [Institute for Fusion Theory and Simulation, Zhejiang University, Hangzhou 310027 (China); Institute for Theoretical Physics I, Ruhr University, Bochum D-44780 (Germany); Sheng, Z. M. [Key Laboratory for Laser Plasmas (Ministry of Education) and Department of Physics, Shanghai Jiao Tong University, Shanghai 200240 (China); Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, CAS, Beijing 100080 (China); Kodama, R. [Photon Pioneers Center, Osaka University, 2-1 Yamada-oka, Suita, Osaka, 565-0871 (Japan); Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka, 565-0871 (Japan); Institute of Laser Engineering, Osaka University, 2-6 Yamada-oka, Suita, Osaka, 565-0871 (Japan)

2011-12-23T23:59:59.000Z

437

The Laconia, New Hampshire Bottom, Ashi Paving Project. Volume 1: Environmental testing report  

SciTech Connect (OSTI)

Bottom ash is the principal waste stream fro m the combustion of municipal solid waste (MSW). It is comprised of grate ash (97%), the slag material discharged at the end of the grate system and grate sffting (3%), the material that melts or falls through the grate structure. This project was conducted to demonstrate the feasibility of using municipal solid waste grate ash as an aggregate substitute in the construction of a pavement binder course for a portion of Rt. 3 in Laconia, New Hampshire. The research was conducted over a two year period during 1993 and 1994. This study is the culmination of an earlier two year characterization study between 1990 and 1992 that documented the physical and environmental characteristics of the bottom ash as it was produced at the Concord, N.H. waste-to-energy (WTE) facility and used in an asphaltic binder course. Together, these two studies provide a complete evaluation of the potential for using grate ash or bottom ash in asphalt binder course or as recycled asphalt pavement (RAP) in base courses in pavements.

NONE

1996-03-01T23:59:59.000Z

438

Characterization and calibration of compact array spectrometers in the ultraviolet spectral region  

SciTech Connect (OSTI)

Array-based spectrometers, with their compact size, low weight, low cost, and fast measurement time, are now frequently used in place of both conventional single-channel scanning monochromators, and broadband meters. Their rapid measurement capability makes them an attractive option for routine solar UV spectral measurements, where shortterm variability in signal is a challenge. However, compactness, portability, low cost and high speed are achieved at the expense of the spectrometer's optical and electronic performance. Thus such spectrometers are more prone to measurement error from environmental changes, and more prone to other intrinsic sources of error such as stray light and detector non-linearity, which significantly affect solar UV measurements, than a scanning monochromator. The effects of stray light and non-linearity can be reduced either by improved optical and detector design or by a detailed spectrometer characterization. We present in this paper our investigation of the performance of three different commercial array spectrometers: two mini-spectrometers, and a more elaborate array spectrometer with an on-board image amplifier device. These were tested for a subset of performance parameters: their wavelength accuracy and stability, electronic linearity, responsivity linearity, stray light sensitivity, and mechanical stability and repeatability. With all three spectrometers we found that these parameters, particularly but not limited to stray light, had a significant impact on the measurement of the incoming optical radiation. This meant that, without characterization, the instruments would be unable to accurately measure the UV component of any source with significant visible radiation. We discuss various simple and low-cost solutions for improving the performance of these instruments, and providing a rigorous calibration using a straightforward set-up including optical filters and the quasi-monochromatic light from a double monochromator.

Shindo, Francois [Measurement Standards Laboratory of New Zealand, Industrial Research, Lower Hutt (New Zealand); Woolliams, Emma; Scott, Barry; Harris, Subrena [National Physical Laboratory, Teddington (United Kingdom)

2013-05-10T23:59:59.000Z

439

Crystal face temperature determination means  

DOE Patents [OSTI]

An optically transparent furnace having a detection apparatus with a pedestal enclosed in an evacuated ampule for growing a crystal thereon is disclosed. Temperature differential is provided by a source heater, a base heater and a cold finger such that material migrates from a polycrystalline source material to grow the crystal. A quartz halogen lamp projects a collimated beam onto the crystal and a reflected beam is analyzed by a double monochromator and photomultiplier detection spectrometer and the detected peak position in the reflected energy spectrum of the reflected beam is interpreted to determine surface temperature of the crystal. 3 figs.

Nason, D.O.; Burger, A.

1994-11-22T23:59:59.000Z

440

Construction and testing of the instrument for neutron holographic study at the Budapest Research Reactor  

SciTech Connect (OSTI)

Neutron scattering device dedicated to neutron holography experiments is described. The device is operating at a constant wavelength prepared by a double focusing monochromator. It is equipped by highly efficient shielding, proper collimator, Eulerian cradle, monitor detector, gamma-ray, and neutron detectors as well. Relevant software serves as control for the measurement and data collection. The harmonized application of the components enumerated above makes our device extremely efficient and unparalleled. Two atomic resolution neutron holographic experiments carried out illustrate the efficiency and power of the instrument.

Marko, Marton; Toeroek, Gyula; Cser, Laszlo [Department of Neutron Spectroscopy, Research Institute for Solid State Physics and Optics, P.O.B. 49, H-1525 Budapest (Hungary); Szakal, Alex [Department of Neutron Spectroscopy, Research Institute for Solid State Physics and Optics, P.O.B. 49, H-1525 Budapest (Hungary); Budapest University of Technology and Economics, Muegyetem rakpart 1-3, H-1113 Budapest (Hungary)

2010-10-15T23:59:59.000Z

Note: This page contains sample records for the topic "monochromator sgm gratings" 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

Spatio-temporal coherence of free-electron laser radiation in the extreme ultraviolet determined by a Michelson interferometer  

SciTech Connect (OSTI)

A key feature of extreme ultraviolet (XUV) radiation from free-electron lasers (FELs) is its spatial and temporal coherence. We measured the spatio-temporal coherence properties of monochromatized FEL pulses at 13.5?nm using a Michelson interferometer. A temporal coherence time of (59±8) fs has been determined, which is in good agreement with the spectral bandwidth given by the monochromator. Moreover, the spatial coherence in vertical direction amounts to about 15% of the beam diameter and about 12% in horizontal direction. The feasibility of measuring spatio-temporal coherence properties of XUV FEL radiation using interferometric techniques advances machine operation and experimental studies significantly.

Hilbert, V.; Rödel, C.; Zastrau, U., E-mail: ulf.zastrau@uni-jena.de [Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität, Max-Wien-Platz 1, 07743 Jena (Germany); Brenner, G.; Düsterer, S.; Dziarzhytski, S.; Harmand, M.; Przystawik, A.; Redlin, H.; Toleikis, S. [Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, 22607 Hamburg (Germany); Döppner, T.; Ma, T. [Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550 (United States); Fletcher, L. [Department of Physics, University of California, Berkeley, California 94720 (United States); Förster, E. [Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität, Max-Wien-Platz 1, 07743 Jena (Germany); Helmholtz-Institut Jena, Fröbelstieg 3, 07743 Jena (Germany); Glenzer, S. H.; Lee, H. J. [SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025 (United States); Hartley, N. J. [Department of Physics, Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU (United Kingdom); Kazak, L.; Komar, D.; Skruszewicz, S. [Institut für Physik, Universität Rostock, 18051 Rostock (Germany); and others

2014-09-08T23:59:59.000Z

442

Bacterial metabolite indole modulates incretin secretion from intestinal enteroendocrine L-cells  

E-Print Network [OSTI]

was used as a control measurement. The dish was mounted in a perfusion chamber on an Olympus IX71 microscope with x40 oil-immersion objective, and imaged using an Orca-ER CCD camera. A 75W Xenon arc lamp and a monochromator (Cairn Research) controlled... ) expressed on the plasma membrane of L-cells, enhancing L-cell number and secretion (Cani et al., 2013; Petersen et al., 2014; Plaisancie et al., 1995; Psichas et al., 2014; Tarini and Wolever, 2010; Tolhurst et al., 2012). Many other bacterial metabolites...

Chimerel, Catalin; Emery, Edward; Summers, David K.; Keyser, Ulrich; Gribble, Fiona M.; Reimann, Frank

2014-01-01T23:59:59.000Z

443

Enhancement of the resolution of full-field optical coherence tomography by using a colour image sensor  

SciTech Connect (OSTI)

The influence of white balance in a colour image detector on the resolution of a full-field optical coherence tomograph (FFOCT) is studied. The change in the interference pulse width depending on the white balance tuning is estimated in the cases of a thermal radiation source (incandescent lamp) and a white light emitting diode. It is shown that by tuning white balance of the detector in a certain range, the FFOCT resolution can be increased by 20 % as compared to the resolution, attained with the use of a monochrome detector. (optical coherence tomography)

Kalyanov, A L; Lychagov, V V; Smirnov, I V; Ryabukho, V P [N.G. Chernyshevsky Saratov State University, Saratov (Russian Federation)

2013-08-31T23:59:59.000Z

444

Application of beam emission spectroscopy to NBI plasmas of Heliotron J  

SciTech Connect (OSTI)

This paper describes the application of the beam emission spectroscopy (BES) to Heliotron J, having the nonsymmetrical helical-magnetic-axis configuration. The spectral and spatial profile of the beam emission has been estimated by the numerical calculation taking the collisional excitation processes between plasmas (electrons/ions) and beam atoms. Two sets of the sightlines with good spatial resolution are presented. One is the optimized viewing chords which have 20 sightlines and observe the whole plasma region with the spatial resolution {Delta}{rho} less than {+-}0.055 using the newly designed viewing port. The other is 15 sightlines from the present viewing port of Heliotron J for the preliminary measurement to discuss the feasibility of the density fluctuation measurement by BES. The beam emission has been measured by a monochromator with a CCD camera. A good consistency has been obtained between the spectral profiles of the beam emission measured by the monochromator and the beam emission spectrum deduced by the model calculation. An avalanche photodiode with an interference filter system was also used to evaluate the signal-to-noise (S/N) ratio of the beam emission in the present experimental setup. The modification of the optical system is being planned to improve the S/N ratio, which will enable us to estimate the density fluctuation in Heliotron J.

Kobayashi, S.; Ohshima, S.; Mizuuchi, T.; Nagasaki, K.; Yamamoto, S.; Okada, H.; Minami, T.; Hanatani, K.; Konoshima, S.; Takeuchi, M.; Toushi, K.; Sano, F. [Institute of Advanced Energy, Kyoto University, Uji, Kyoto 611-0011 (Japan); Kado, S. [School of Engineering, The University of Tokyo, Bunkyo, Tokyo 113-8656 (Japan); Oishi, T. [Nagoya University, Chikusa-ku, Nagoya 464-8603 (Japan); Kagawa, T.; Lee, H. Y.; Minami, T.; Nakamura, Y. [Graduate School of Energy Science, Kyoto University, Uji, Kyoto 611-0011 (Japan); Murakami, S. [Graduate School of Engineering, Kyoto University, Kyoto, Kyoto 606-8501 (Japan)

2010-10-15T23:59:59.000Z

445

Note: Deep ultraviolet Raman spectrograph with the laser excitation line down to 177.3 nm and its application  

SciTech Connect (OSTI)

Deep UV Raman spectrograph with the laser excitation line down to 177.3 nm was developed in this laboratory. An ellipsoidal mirror and a dispersed-subtractive triple monochromator were used to collect and disperse Raman light, respectively. The triple monochromator was arranged in a triangular configuration with only six mirrors used. 177.3 nm laser excited Raman spectrum with cut-off wavenumber down to 200 cm{sup ?1} and spectral resolution of 8.0 cm{sup ?1} can be obtained under the condition of high purity N{sub 2} purging. With the C–C ? bond in Teflon selectively excited by the 177.3 nm laser, resonance Raman spectrum of Teflon with good quality was recorded on the home-built instrument and the ?-?{sup *} transition of C–C bond was studied. The result demonstrates that deep UV Raman spectrograph is powerful for studying the systems with electronic transition located in the deep UV region.

Jin, Shaoqing [State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023 (China) [State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023 (China); University of the Chinese Academy of Sciences, Beijing 100049 (China); Fan, Fengtao; Guo, Meiling; Zhang, Ying; Feng, Zhaochi, E-mail: zcfeng@dicp.ac.cn, E-mail: canli@dicp.ac.cn; Li, Can, E-mail: zcfeng@dicp.ac.cn, E-mail: canli@dicp.ac.cn [State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023 (China)] [State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023 (China)

2014-04-15T23:59:59.000Z

446

The contact heat conductance at diamond-OFHC copper interface with GaIn eutectic as a heat transfer medium  

SciTech Connect (OSTI)

Results of an experimental study of the contact heat conductance across a single diamond crystal interface with OFHC copper (Cu) are reported. Gallium-indium (GaIn) eutectic was used as an interstitial material. Contact conductance data are important in the design and the prediction of the performance of x-ray diamond monochromators under high-heat-load conditions. Two sets of experiments were carried out. In one, the copper surface in contact with diamond was polished and then electroless plated with 1 {mu}m of nickel, while in the other, the copper contact surface was left as machined. Measured average interface heat conductances are 44.7 {plus_minus}8 W/cm{sup 2}{minus}K for nonplated copper and 23.0 {plus_minus}3 W/cm{sup 2}{minus}K for nickel-plated copper. For reference, the thermal contact conductances at a copper-copper interface (without diamond) were also measured, and the results are reported. A typical diamond monochromator, 0.2 mm thick, will absorb about 44 W under a standard undulator beam at the Advanced Photon Source. The measured conductance for nickel-plated copper suggests that the temperature drop across the interface of diamond and nickel-plated copper, with a 20 mm{sup 2} contact area, will be about 10{degree}C. Therefore temperature rises are rather modest, and the accuracy of the measured contact conductances presented here are sufficient for design purposes.

Assoufid, L.; Khounsary, A.M.

1996-01-01T23:59:59.000Z

447

A Beam line for Macromolecular Crystallography in ALBA  

SciTech Connect (OSTI)

ALBA is a third generation 3 GeV storage ring being built near Barcelona and foreseen to be operational in 2010. Out of the seven beamlines already funded in ALBA, one will be dedicated to macromolecular crystallography (MX). The beamline, dubbed XALOC, shall cope with a broad range of crystal structures and sizes. To this aim, a flexible optical design involving variable focusing optics has been incorporated into the beamline optics. The photon source will be a 2 m long, in-vacuum undulator with a period of 21.3 mm. The optics will consist in a Si(111), double-crystal monochromator cryogenically cooled, and a pair of mirrors placed in a Kirkpatrick-Baez configuration. The beamline will deliver a high flux beam in the 5-15 keV energy range, with an energy resolution of {delta}E/E {approx}2 x 10-4. In addition to the main beamline, it is being considered the possibility to use a diamond laue monochromator to provide photons at a fixed wavelength to an ancillary branch. This report shows the present status of the beamline design.

Juanhuix, Jordi; Ferrer, Salvador [CELLS -ALBA Synchrotron, Ed. Ciencies, Campus UAB, 08193 Bellaterra, Barcelona (Spain)

2007-01-19T23:59:59.000Z

448

Initial laboratory evaluation of color video cameras: Phase 2  

SciTech Connect (OSTI)

Sandia National Laboratories has considerable experience with monochrome video cameras used in alarm assessment video systems. Most of these systems, used for perimeter protection, were designed to classify rather than to identify intruders. The monochrome cameras were selected over color cameras because they have greater sensitivity and resolution. There is a growing interest in the identification function of security video systems for both access control and insider protection. Because color camera technology is rapidly changing and because color information is useful for identification purposes, Sandia National Laboratories has established an on-going program to evaluate the newest color solid-state cameras. Phase One of the Sandia program resulted in the SAND91-2579/1 report titled: Initial Laboratory Evaluation of Color Video Cameras. The report briefly discusses imager chips, color cameras, and monitors, describes the camera selection, details traditional test parameters and procedures, and gives the results reached by evaluating 12 cameras. Here, in Phase Two of the report, we tested 6 additional cameras using traditional methods. In addition, all 18 cameras were tested by newly developed methods. This Phase 2 report details those newly developed test parameters and procedures, and evaluates the results.

Terry, P.L.

1993-07-01T23:59:59.000Z

449

Gamma ray optics  

SciTech Connect (OSTI)

Via refractive or diffractive scattering one can shape {gamma} ray beams in terms of beam divergence, spot size and monochromaticity. These concepts might be particular important in combination with future highly brilliant gamma ray sources and might push the sensibility of planned experiments by several orders of magnitude. We will demonstrate the experimental feasibility of gamma ray monochromatization on a ppm level and the creation of a gamma ray beam with nanoradian divergence. The results are obtained using the inpile target position of the High Flux Reactor of the ILL Grenoble and the crystal spectrometer GAMS. Since the refractive index is believed to vanish to zero with 1/E{sup 2}, the concept of refractive optics has never been considered for gamma rays. The combination of refractive optics with monochromator crystals is proposed to be a promising design. Using the crystal spectrometer GAMS, we have measured for the first time the refractive index at energies in the energy range of 180 - 2000 keV. The results indicate a deviation from simple 1/E{sup 2} extrapolation of X-ray results towards higher energies. A first interpretation of these new results will be presented. We will discuss the consequences of these results on the construction of refractive optics such as lenses or refracting prisms for gamma rays and their combination with single crystal monochromators.

Jentschel, M.; Guenther, M. M.; Habs, D.; Thirolf, P. G. [Institut Laue-Langevin, F38042 Grenoble (France); Max-Planck-Institut fuer Quantenoptik, D-85748 Garching (Germany); Max-Planck-Institut fuer Quantenoptik, D-85748 Garching, Germany and Ludwig-Maximilians-Universitaet Muenchen, D-85748 Garching (Germany); Ludwig-Maximilians-Universitaet Muenchen, D-85748 Garching (Germany)

2012-07-09T23:59:59.000Z

450

Formation of crystalline TiO{sub 2-x}N{sub x} and its photocatalytic activity  

SciTech Connect (OSTI)

Amorphous precursors to nitrogen-doped TiO{sub 2} (NTP) and pure TiO{sub 2} (ATP) powders were synthesized by hydrolytic synthesis and sol-gel method (SGM), respectively. Corresponding crystalline phases were obtained by thermally induced transformation of these amorphous powders. From FT-IR and XPS data, it was concluded that a complex containing titanium and ammonia was formed in the precipitate stage while calcination drove weakly adsorbed ammonium species off the surface, decomposed ammonia bound on surface of precipitated powder and led to substitution of nitrogen atom into the lattice of TiO{sub 2} during the crystallization. The activation energies required for grain growth in amorphous TiO{sub 2-x}N{sub x} and TiO{sub 2} samples were determined to be 1.6 and 1.7kJ/mol, respectively. Those required for the phase transformation from amorphous to crystalline TiO{sub 2-x}N{sub x} and TiO{sub 2} were determined to be 129 and 142kJ/mol, respectively. A relatively low temperature was required for the phase transformation in NTP sample than in ATP sample. The fabricated N-doped TiO{sub 2} photocatalyst absorbed the visible light showing two absorption edges; one in UV range due to titanium oxide as the main edge and the other due to nitrogen doping as a small shoulder. TiO{sub 2-x}N{sub x} photocatalyst demonstrated its photoactivity for photocurrent generation and decomposition of 2-propanol (IPA) under visible light irradiation ({lambda}>=420nm)

Jang, Jum Suk [Department of Chemical Engineering, Institute of Environmental and Energy Technology, School of Environmental and Science Engineering, Pohang University of Science and Technology (POSTECH), San 31 Hyoja-dong, Pohang 790-784 (Korea, Republic of); Kim, Hyun Gyu [Busan Center, Korea Basic Science Institute (KBSI), Busan, 609-735 (Korea, Republic of); Ji, Sang Min [Department of Chemical Engineering, Institute of Environmental and Energy Technology, School of Environmental and Science Engineering, Pohang University of Science and Technology (POSTECH), San 31 Hyoja-dong, Pohang 790-784 (Korea, Republic of); Bae, Sang Won [Department of Chemical Engineering, Institute of Environmental and Energy Technology, School of Environmental and Science Engineering, Pohang University of Science and Technology (POSTECH), San 31 Hyoja-dong, Pohang 790-784 (Korea, Republic of); Jung, Jong Hyeon [Division of Biotechnology and Health Engineering, Sorabol College, Gyeongju 780-711 (Korea, Republic of); Shon, Byung Hyun [Department of Environmental Engineering, Hanseo Unversity, Seosan 356-706 (Korea, Republic of); Lee, Jae Sung [Department of Chemical Engineering, Institute of Environmental and Energy Technology, School of Environmental and Science Engineering, Pohang University of Science and Technology (POSTECH), San 31 Hyoja-dong, Pohang 790-784 (Korea, Republic of)]. E-mail: jlee@postech.ac.kr

2006-04-15T23:59:59.000Z

451

Natural Recharge to the Unconfined Aquifer System on the Hanford Site from the Greater Cold Creek Watershed: Progress Report 2004  

SciTech Connect (OSTI)

Movement of contaminants in groundwater at the Hanford Site is heavily dependent on recharge to the unconfined aquifer. As the effects of past artificial discharges dissipate, the water table is expected to return to more natural conditions, and natural recharge will become the driving force when evaluating future groundwater flow conditions and related contaminant transport. Previous work on the relationship of natural recharge to groundwater movement at the Hanford Site has focused on direct recharge from infiltrating rainfall and snowmelt within the area represented by the Sitewide Groundwater Model (SGM) domain. However, part of the groundwater recharge at Hanford is provided by flow from Greater Cold Creek watershed (GCC), a large drainage area on the western boundary of the Hanford Site that includes Cold Creek Valley, Dry Creek Valley, and the Hanford side of Rattlesnake Mountain. This study was undertaken to estimate the recharge from GCC, which is believed to enter the unconfined aquifer as both infiltrating streamflow and shallow subsurface flow. To estimate recharge, the Distributed Hydrology-Soil-Vegetation Model (DHSVM) was used to simulate a detailed water balance of GCC from 1956 to 2001 at a spatial resolution of 200~m and a temporal resolution of one hour. For estimating natural recharge to Hanford from watersheds along its western and southwestern boundaries, the most important aspects that need to be considered are 1)~distribution and relative magnitude of precipitation and evapotranspiration over the watershed, 2)~streamflow generation at upper elevations and infiltration at lower elevations during rare runoff events, and 3)~permeability of the basalt bedrock surface underlying the soil mantle.

Waichler, Scott R.; Wigmosta, Mark S.; Coleman, Andre M.

2004-09-14T23:59:59.000Z

452

Laser bandwidth interlock capable of single pulse detection and rejection  

DOE Patents [OSTI]

A pulse of laser light is switched out of a pulse train and spatially dispersed into its constituent wavelengths. The pulse is collimated to a suitable size and then diffracted by high groove density multilayer dielectric gratings. This imparts a different angle to each individual wavelength so that, when brought to the far field with a lens, the colors have spread out in a linear arrangement. The distance between wavelengths (resolution) can be tailored for the specific laser and application by altering the number of times the beam strikes the diffraction gratings, the groove density of the gratings and the focal length of the lens. End portions of the linear arrangement are each directed to a respective detector, which converts the signal to a 1 if the level meets a set-point, and a 0 if the level does not. If both detectors produces a 1, then the pulse train is allowed to propagate into an optical system.

Armstrong, James P; Telford, Steven James; Lanning, Rodney Kay; Bayramian, Andrew James

2012-10-09T23:59:59.000Z

453

Aberration-free, all-reflective laser pulse stretcher  

DOE Patents [OSTI]

An all-reflective pulse stretcher for laser systems employing chirped-pulse amplification enables on-axis use of the focusing mirror which results in ease of use, significantly decreased sensitivity to alignment and near aberration-free performance. By using a new type of diffraction grating which contains a mirror incorporated into the grating, the stretcher contains only three elements: 1) the grating, 2) a spherical or parabolic focusing mirror, and 3) a flat mirror. Addition of a fourth component, a retro-reflector, enables multiple passes of the same stretcher resulting in stretching ratios beyond the current state of the art in a simple and compact design. The pulse stretcher has been used to stretch pulses from 20 fsec to over 600 psec (a stretching ratio in excess of 30,000).

Perry, Michael D. (Livermore, CA); Banks, Paul S. (Livermore, CA); Stuart, Brent C. (Fremont, CA); Fochs, Scott N. (Livermore, CA)

1999-09-28T23:59:59.000Z

454

Transverse-longitudinal integrated resonator  

DOE Patents [OSTI]

A transverse-longitudinal integrated optical resonator (TLIR) is disclosed which includes a waveguide, a first and a second subwavelength resonant grating in the waveguide, and at least one photonic band gap resonant structure (PBG) in the waveguide. The PBG is positioned between the first and second subwavelength resonant gratings. An electro-optic waveguide material may be used to permit tuning the TLIR and to permit the TLIR to perform signal modulation and switching. The TLIR may be positioned on a bulk substrate die with one or more electronic and optical devices and may be communicably connected to the same. A method for fabricating a TLIR including fabricating a broadband reflective grating is disclosed. A method for tuning the TLIR's transmission resonance wavelength is also disclosed.

Hutchinson, Donald P. (Knoxville, TN); Simpson, Marcus L. (Knoxville, TN); Simpson, John T. (Knoxville, TN)

2003-03-11T23:59:59.000Z

455

Narrowband resonant transmitter  

DOE Patents [OSTI]

A transverse-longitudinal integrated optical resonator (TLIR) is disclosed which includes a waveguide, a first and a second subwavelength resonant grating in the waveguide, and at least one photonic band gap resonant structure (PBG) in the waveguide. The PBG is positioned between the first and second subwavelength resonant gratings. An electro-optic waveguide material may be used to permit tuning the TLIR and to permit the TLIR to perform signal modulation and switching. The TLIR may be positioned on a bulk substrate die with one or more electronic and optical devices and may be communicably connected to the same. A method for fabricating a TLIR including fabricating a broadband reflective grating is disclosed. A method for tuning the TLIR's transmission resonance wavelength is also disclosed.

Hutchinson, Donald P.; Simpson, Marcus L.; Simpson, John T.

2004-06-29T23:59:59.000Z

456

Dual waveband compact catadioptric imaging spectrometer  

DOE Patents [OSTI]

A catadioptric dual waveband imaging spectrometer that covers the visible through short-wave infrared, and the midwave infrared spectral regions, dispersing the visible through shortwave infrared with a zinc selenide grating and midwave infrared with a sapphire prism. The grating and prism are at the cold stop position, enabling the pupil to be split between them. The spectra for both wavebands are focused onto the relevant sections of a single dual waveband detector. Spatial keystone distortion is controlled to less than one tenth of a pixel over the full wavelength range, facilitating the matching of the spectra in the midwave infrared with the shorter wavelength region.

Chrisp, Michael P.

2012-12-25T23:59:59.000Z

457

Print date 01/06/15 Save date 21/05/01 11:01 PLEASE DO NOT QUOTE WITHOUT AUTHOR’S PERMISSION  

E-Print Network [OSTI]

this research. I am particularly grateful to Yvonne Laing who acted as a research assistant on the project and who identified many of the sources of information. I am also grateful to Geoff Frost and Dave Owen for their comments on an earlier version of the paper. Further thanks are due to Samantha Benoy, External Affairs Manager, ICI and Frank Rose, Vice President, Group Safety, Security, Health and Environment for their comments on an earlier draft of this paper. All views expressed are those of the author unless otherwise stated.

Carol A Adams; Paper For; Apira Adelaide

458

Efficient out-coupling and beaming of Tamm optical states via surface plasmon polariton excitation  

SciTech Connect (OSTI)

We present evidence of optical Tamm states to surface plasmon polariton (SPP) coupling. We experimentally demonstrate that for a Bragg stack with a thin metal layer on the surface, hybrid Tamm-SPP modes may be excited when a grating on the air-metal interface is introduced. Out-coupling via the grating to free space propagation is shown to enhance the transmission as well as the directionality and polarization selection for the transmitted beam. We suggest that this system will be useful on those devices, where a metallic electrical contact as well as beaming and polarization control is needed.

Lopez-Garcia, M.; Ho, Y.-L. D.; Taverne, M. P. C.; Chen, L.-F.; Rarity, J. G.; Oulton, R. [Department of Electrical and Electronic Engineering, University of Bristol, Faculty of Engineering, Queen's Building, University Walk, Bristol BS8 1TR (United Kingdom); Murshidy, M. M. [Department of Physics and Mathematics, University of Hull, Cottingham Road, HU6 7RX Hull (United Kingdom); Department of Physics, Faculty of Science, Helwan University, Helwan (Egypt); Yousef Jameel Science and Technology Research Center, The American University in Cairo (Egypt); Edwards, A. P.; Adawi, A. M. [Department of Physics and Mathematics, University of Hull, Cottingham Road, HU6 7RX Hull (United Kingdom); Serry, M. Y. [Yousef Jameel Science and Technology Research Center, The American University in Cairo (Egypt)

2014-06-09T23:59:59.000Z

459

Boxing the Boundaries: Prize Fighting, Masculinities, and Shifting Social and Cultural Boundaries in the United State, 1882-1913  

E-Print Network [OSTI]

who shared the same research topic. I would like to thank Dr. Mark Joslyn for his presence in the committee. I will not forget his kindness. I am grateful for other professors who helped me grow academically. I should specially mention Dr. Ann... appreciably aided by our graduate division secretary, Kay Isbell. I also extend my gratitude to two friends I met at KU, Mark A. Rhrein and Ralf Brauchler. I am no less thankful for my colleague, Sanjo Kim. I am also grateful for all people who helped me...

Kim, Jeonguk

2010-07-28T23:59:59.000Z

460

Tunable, superconducting, surface-emitting teraherz source  

DOE Patents [OSTI]

A compact, solid-state THz source based on the driven Josephson vortex lattice in a highly anisotropic superconductor such as Bi.sub.2Sr.sub.2CaCu.sub.2O.sub.8 that allows cw emission at tunable frequency. A second order metallic Bragg grating is used to achieve impedance matching and to induce surface emission of THz-radiation from a Bi.sub.2Sr.sub.2CaCu.sub.2O.sub.8 sample. Steering of the emitted THz beam is accomplished by tuning the Josephson vortex spacing around the grating period using a superimposed magnetic control field.

Welp, Ulrich (Lisle, IL); Koshelev, Alexei E. (Bolingbrook, IL); Gray, Kenneth E. (Evanston, IL); Kwok, Wai-Kwong (Evanston, IL); Vlasko-Vlasov, Vitalii (Downers Grove, IL)

2009-10-27T23:59:59.000Z

Note: This page contains sample records for the topic "monochromator sgm gratings" 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

BARRIER ISSUES TO THE UTILIZATION OF BIOMASS  

SciTech Connect (OSTI)

The Energy & Environmental Research Center (EERC) is conducting a project to examine the fundamental issues limiting the use of biomass in small industrial steam/power systems in order to increase the future use of this valuable domestic resource. Specifically, the EERC is attempting to elucidate the ash-related problems--grate clinkering and heat exchange surface fouling--associated with cofiring coal and biomass in grate-fired systems. Utilization of biomass in stoker boilers designed for coal can be a cause of concern for boiler operators. Boilers that were designed for low volatile fuels with lower reactivities can experience damaging fouling when switched to higher volatile and more reactive lower-rank fuels, such as when cofiring biomass. Higher heat release rates at the grate can cause more clinkering or slagging at the grate because of higher temperatures. Combustion and loss of volatile matter can start too early for biomass fuels compared to the design fuel, vaporizing alkali and chlorides which then condense on rear walls and heat exchange tube banks in the convective pass of the stoker, causing noticeable increases in fouling. In addition, stoker-fired boilers that switch to biomass blends may encounter new chemical species such as potassium sulfates and various chlorides, in combination with different flue gas temperatures because of changes in fuel heating value which can adversely affect ash deposition behavior. The goal of this project is to identify the primary ash mechanisms related to grate clinkering and heat exchange surface fouling associated with cofiring coal and biomass--specifically wood and agricultural residuals--in grate-fired systems, leading to future mitigation of these problems. The specific technical objectives of the project are: Modification of an existing EERC pilot-scale combustion system to simulate a grate-fired system; Verification testing of the simulator; Laboratory-scale testing and fuel characterization to determine ash formation and potential fouling mechanisms and to optimize activities in the modified pilot-scale system; and Pilot-scale testing in the grate-fired system. The resulting data will be collected, analyzed, and reported to elucidate ash-related problems during biomass-coal cofiring and offer a range of potential solutions.

Bruce C. Folkedahl; Darren D. Schmidt; Greg F. Weber; Christopher J. Zygarlicke

2001-10-01T23:59:59.000Z

462

Optical-diffraction method for determining crystal orientation  

DOE Patents [OSTI]

Disclosed is an optical diffraction technique for characterizing the three-dimensional orientation of a crystal sample. An arbitrary surface of the crystal sample is texture etched so as to generate a pseudo-periodic diffraction grating on the surface. A laser light beam is then directed onto the etched surface, and the reflected light forms a farfield diffraction pattern in reflection. Parameters of the diffraction pattern, such as the geometry and angular dispersion of the diffracted beam are then related to grating shape of the etched surface which is in turn related to crystal orientation. This technique may be used for examining polycrystalline silicon for use in solar cells.

Sopori, B.L.

1982-05-07T23:59:59.000Z

463

On the mechanism of photoinduced refractive index changes in phosphosilicate glass  

SciTech Connect (OSTI)

The photoinduced growth of the refractive index of phosphosilicate glass during Bragg grating inscription and the thermal decay of the grating have a number of unusual features. The observed index variations are interpreted in terms of a new model for photoinduced glass network rearrangement. The model assumes the formation of photoinduced voids (nanopores) in the glass network near point defects. The nanopores may migrate through the network via bond switching when the network is in a 'soft' state. The photoinduced variations in network density lead to index variations. (fibres)

Larionov, Yu V [A M Prokhorov General Physics Institute, Russian Academy of Sciences, Moscow (Russian Federation); Sokolov, V O; Plotnichenko, V G [Fiber Optics Research Center, Russian Academy of Sciences, Moscow (Russian Federation)

2010-05-26T23:59:59.000Z

464

Evaluation of growth methods for the heteroepitaxy of non-polar (11-20) GaN on sapphire by MOVPE  

E-Print Network [OSTI]

double grating spectrometer equipped with a Peltier-cooled GaAs photomultiplier tube. The spectra were recorded with signal lock-in processing techniques. As the HeCd laser absorption length is ca. 350 nm for 99% absorption in GaN (ignoring any carrier... double grating spectrometer equipped with a Peltier-cooled GaAs photomultiplier tube. The spectra were recorded with signal lock-in processing techniques. As the HeCd laser absorption length is ca. 350 nm for 99% absorption in GaN (ignoring any carrier...

Oehler, F.; Sutherland, D.; Zhu, T.; Emery, R.; Badcock, T. J.; Kappers, M. J.; Humphreys, C. J.; Dawson, P.; Oliver, R. A.

2014-09-16T23:59:59.000Z

465

Apparatus and method for optical pulse measurement  

DOE Patents [OSTI]

Practical third-order frequency-resolved optical grating (FROG) techniques for characterization of ultrashort optical pulses are disclosed. The techniques are particularly suited to the measurement of single and/or weak optical pulses having pulse durations in the picosecond and subpicosecond regime. The relative quantum inefficiency of third-order nonlinear optical effects is compensated for through i) use of phase-matched transient grating beam geometry to maximize interaction length, and ii) use of interface-enhanced third-harmonic generation.

Trebino, Rick P. (Livermore, CA); Tsang, Thomas (Brooklyn, NY); Fittinghoff, David N. (San Diego, CA); Sweetser, John N. (Livermore, CA); Krumbuegel, Marco A. (Danville, CA)

1999-12-28T23:59:59.000Z

466

Tuned optical cavity magnetometer  

DOE Patents [OSTI]

An atomic magnetometer is disclosed which utilizes an optical cavity formed from a grating and a mirror, with a vapor cell containing an alkali metal vapor located inside the optical cavity. Lasers are used to magnetically polarize the alkali metal vapor and to probe the vapor and generate a diffracted laser beam which can be used to sense a magnetic field. Electrostatic actuators can be used in the magnetometer for positioning of the mirror, or for modulation thereof. Another optical cavity can also be formed from the mirror and a second grating for sensing, adjusting, or stabilizing the position of the mirror.

Okandan, Murat (Edgewood, NM); Schwindt, Peter (Albuquerque, NM)

2010-11-02T23:59:59.000Z

467

BARRIER ISSUES TO THE UTILIZATION OF BIOMASS  

SciTech Connect (OSTI)

The Energy & Environmental Research Center (EERC) has completed a project to examine fundamental issues that could limit the use of biomass in small industrial steam/power systems in order to increase the future use of this valuable domestic resource. Specifically, the EERC attempted to elucidate the ash-related problems--grate clinkering and heat exchange surface fouling--associated with cofiring coal and biomass in grate-fired systems. Utilization of biomass in stoker boilers designed for coal can be a cause of concern for boiler operators. Boilers that were designed for low-volatile fuels with lower reactivities can experience problematic fouling when switched to higher-volatile and more reactive coal-biomass blends. Higher heat release rates at the grate can cause increased clinkering or slagging at the grate due to higher temperatures. Combustion and loss of volatile matter can start much earlier for biomass fuels compared to design fuel, vaporizing alkali and chlorides which then condense on rear walls and heat exchange tube banks in the convective pass of the stoker, causing noticeable increases in fouling. In addition, stoker-fired boilers that switch to biomass blends may encounter new chemical species such as potassium sulfates, various chlorides, and phosphates. These species in combination with different flue gas temperatures, because of changes in fuel heating value, can adversely affect ash deposition behavior. The goal of this project was to identify the primary ash mechanisms related to grate clinkering and heat exchange surface fouling associated with cofiring coal and biomass--specifically wood and agricultural residuals--in grate-fired systems, leading to future mitigation of these problems. The specific technical objectives of the project were: (1) Modification of an existing pilot-scale combustion system to simulate a grate-fired system. (2) Verification testing of the simulator. (3) Laboratory-scale testing and fuel characterization to determine ash formation and potential fouling mechanisms and to optimize activities in the modified pilot-scale system. (4) Pilot-scale testing in the grate-fired system. The resulting data were used to elucidate ash-related problems during coal-biomass cofiring and offer a range of potential solutions.

Bruce C. Folkedahl; Jay R. Gunderson; Darren D. Schmidt; Greg F. Weber; Christopher J. Zygarlicke

2002-09-01T23:59:59.000Z

468

4 of 22 DOCUMENTS Copyright 1989 The Harvard Law Review Association.  

E-Print Network [OSTI]

, Harvard Law School, I am grateful to Rob Fisher, Michael Dorf, Kenneth Chesebro, Gene Sperling, and Barack Obama for their analytic and research assistance and to Professor Gerald Holton (Harvard Physics the Association of the Bar of the City of New York on May 11, 1989, 44 RECORD OF THE ASS'N OF THE BAR OF THE CITY

Tobias, William Alexander

469

Dynamical K edge and line variations in the X-ray spectrum of the ultra-compact binary 4U 0614+091  

E-Print Network [OSTI]

We observed the ultra-compact binary candidate 4U 0614+091 for a total of 200 ks with the high-energy transmission gratings on board the Chandra X-ray Observatory. The source is found at various intensity levels with ...

Schulz, Norbert S.

470

SUSTAINABLE EVOLUTIONARY ALGORITHMS AND SCALABLE EVOLUTIONARY SYNTHESIS OF DYNAMIC  

E-Print Network [OSTI]

the population achieves, the more the search capability is lost. This is also the case for many other with energy, courage, and enthusiasms. Foremost, I'd like to thank my parents who have been always proud of their son for each progress he has made in study and research. I am also grateful to my parents

Hu, Jianjun

471

Title of dissertation: CONTROL, DYNAMICS, AND EPIDEMIC SPREADING IN COMPLEX SYSTEMS  

E-Print Network [OSTI]

To my wife Zsofi and to my parents ii #12;Acknowledgments There are many people to whom I am grateful scientific ideas are lost if not conveyed in a clear accessible manner. He is he sharpest minded critic and professionalism of Jane Hessing. Finally, I would like to thank my parents for their encouragement and support. iv

Anlage, Steven

472

Design Decision Making for Market Systems and Environmental Policy with Vehicle Design Applications  

E-Print Network [OSTI]

it was short because the first day I arrived in Pittsburgh and got lost was just like yesterday never come to the U.S. to pursue my degree. Finally, I want to gratefully thank my family ­ my parents, my parents-in-law, my brother-in-law Hsiao-Tang (Stephen), my sister I-Ling and my brother Nai

Michalek, Jeremy J.

473

Highly-Decoupled Thread Level Redundancy Muhammad Wasiur Rashid  

E-Print Network [OSTI]

lost patience with me, even at moments when I lost patience with myself. Portions of the dissertation like to thank my parents Prof. R. I. M. Aminur Rashid and Prof. Jahan Zeb Akhtar and my brother M. Wasequr Rashid for their constant support and encouragement. #12;I am grateful to my parents for being my

Huang, Michael C.

474

A Measurement of the Di#ractive Reduced CrossSection # D(3)  

E-Print Network [OSTI]

high statistics at high x IP (x IP # 0.03). Good agreement is generally observed in the region grateful to the Rutherford Appleton Laboratory that funded my frequent trips and my two long attachments in Hamburg. Whilst the work presented in this thesis is my own, research in high energy physics

475

A Modi ed Equations Approach for Multi-Symplectic Integration Methods  

E-Print Network [OSTI]

Submitted for the degree of Doctor of Philosophy Department of Mathematics and Statistics School. I am very grateful to ORS and the University of Surrey for funding and for sending me to conferences as semi-discrete conservation laws of energy and momentum, and in some speci#12;c cases other fully

Moore, Brian

476

Prompt Photon Production in Deep Inelastic Scattering at HERA  

E-Print Network [OSTI]

for well-isolated photons in the trans- verse energy and pseudorapidity range 5 and com- pleted the work in this thesis. In particular, I am grateful to PPARC for funding my work desribes the background subtraction performed to statistically ex- tract the final prompt photon event

477

The Carbon Balance of Bioenergy Production in Wisconsin Keith R. Cronin  

E-Print Network [OSTI]

of the GREET model. Finally, I am grateful to the Wisconsin Focus on Energy program for funding this research potentially supply Wisconsin with a domestic energy source and supplement income for Wisconsin producers from the National Agricultural Statistics Service (NASS) and crop enterprise budgets, produced

Wisconsin at Madison, University of

478

Fecal near-infrared reflectance spectroscopy calibrations for predicting diet quality and intake of donkeys  

E-Print Network [OSTI]

Systems (LEWS) and Global Livestock CRSP (GL-CRSP) for financially supporting me during the last two years of my study at Texas A&M University and my research in Africa. I am deeply grateful to Dr. Abdi Jamma, Dr. Bob Blaisdell and Jey Angrer...

Kidane, Negusse Fessehaye

2006-08-16T23:59:59.000Z

479

Measurement of the elements of {chi}{sup (3)} for degenerate four-wave mixing in OH  

SciTech Connect (OSTI)

Measurements of the polarization characteristics of degenerate four-wave mixing transitions in the A{sup 2}{Sigma}+ {r_arrow} X{sup 2}{product}(0,0) band of OH are found to disagree with theory and are attributed to population gratings from open-system effects.

Rahn, L.A. [Sandia National Labs., Livermore, CA (United States); Brown, M.S. [SRI International, Palo Alto, CA (United States). Molecular Physics Lab.

1992-02-01T23:59:59.000Z

480

Annual Simulated and Observed Flow Volumes for Guadalupe  

E-Print Network [OSTI]

is funded by the Regional Monitoring Program for Water Quality in San Francisco Estuary. We gratefully Segmentation In-Steam Gauges (Flow and SSC) and Model Set-up Calero Stn. San Jose Stn. Alamitos Stn. Guadalupe). Suspended sediment concentration (SSC) measurements have been taken on a 15-minute basis in Guadalupe River

Note: This page contains sample records for the topic "monochromator sgm gratings" 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

Copyright 2006 John Wiley & Sons, Ltd and ERP Environment Empirical Analysis of Eco-Industrial  

E-Print Network [OSTI]

and capital, China needs to seek a more inte- grated development strategy. Industrial ecology (IE) may be one solution as it aims at optimizing the use of materials and energy in products, processes, industrial WORLD, CHINA HAS EXPERIENCED THE MOST RAPID increase during the last two decades by encouraging local

482

Office of Intellectual Property Commercialization  

E-Print Network [OSTI]

to commercialize intellectual property. Local businesses are key to the development of UAF IP designed defense, local companies will likely be the first to develop technologies around mining, fisheries, and energy development in the North. We are grateful to those companies who have contacted us to date and we

Ickert-Bond, Steffi

483

Quantum Interference as a Process of Accumulation of Single-Particle Arrivals  

SciTech Connect (OSTI)

Single-particle interference experiments brought new arguments supporting objective reality of matter and photon waves, compatibility of particle and wave properties of quantons, the evidence of existence of particles trajectories during the accumulation of an interference pattern, and the necessity of completing quantum mechanics by the description of single events. By integrating the probability density of transverse momenta multiplied by the probability density of particle distribution at the slits over all transverse momenta and over all slit points, we have derived the expression for the probability density for the particle's arrival at time t to a point behind a grating. The agreement with usual probability density given by the modulus square of the wave function in coordinate representation is very good in the far field. In the near field the agreement is poor. This was demonstrated previously for gratings with a small number of slits, and is demonstrated in our paper for a many-slits grating, where the Talbot Laue effect exists. Further study of the form of particles' trajectories in the near field is necessary. In addition to obtaining agreement with the distribution after many events have been accumulated in the far field, with this approach one might also obtain a distribution of a smaller number of events. For that we do not integrate over all momenta and slit points at the grating, but over randomly chosen ones.

Bozic, Mirjana; Arsenovic, Dusan [Institute of Physics, Belgrade (Serbia and Montenegro)

2005-10-17T23:59:59.000Z

484

Distributed Intrusion Detection Models for Mobile Ad Hoc Networks CHIN-YANG HENRY TSENG  

E-Print Network [OSTI]

feel really lucky to be his student at UC Davis. I sincerely thank to Professor Matt Bishop in the OFFICE OF GRADUATE STUDIES of the UNIVERSITY OF CALIFORNIA DAVIS Approved By: Karl N. Levitt, Chair. I am very grateful that he spent his precious time and energy for advising my works

California at Davis, University of

485

A Provenance Model for Manually Curated Data Peter Buneman1  

E-Print Network [OSTI]

are often absent, incomplete or ad hoc, often despite curators' best efforts. Also, manually-managedA Provenance Model for Manually Curated Data Peter Buneman1 , Adriane Chapman2 , James Cheney1- grating various existing data sources "by hand", that is, by manually en- tering or copying data from

Cheney, James

486

A Provenance Model for Manually Curated Data Peter Buneman1  

E-Print Network [OSTI]

, often despite curators' best efforts. Also, manually-managed provenance records are at higher riskA Provenance Model for Manually Curated Data Peter Buneman1 , Adriane Chapman2 , James Cheney1- grating various existing data sources "by hand", that is, by manually en- tering or copying data from

Michigan, University of

487

TECH SAVVY! Tech Savvy Girls without Limits...  

E-Print Network [OSTI]

is grateful for significant funding from Praxair, Inc. through the Praxair Foundation. The Buffalo Branch for Tech Savvy was provided by our major sponsor for six years... the Praxair Foundation. The Buffalo. AAUW is partnering with Praxair, UB's School of Engineering, WTS, Inc., and many others in Western New

Krovi, Venkat

488

Charges, Costs and Market Power in the Deregulated UK Electricity Retail Market  

E-Print Network [OSTI]

of East Anglia CCR Working Paper CCR 03-6 Abstract The UK energy regulator claims that prices are set: Energy: Pricing, Market Power Acknowledgements: We are grateful for financial support from the Economic a lower absolute quantity of energy than those who are richer. Prices for different consumption levels

Feigon, Brooke

489

Noname manuscript No. (will be inserted by the editor)  

E-Print Network [OSTI]

of the storage system and constitute the only man- made intrusive element in the geologic systems. The role : 10.1007/s10596-012-9332-0 #12;2 C. Desceliers et al. grated in a prediction model of a storage system. Their effects must be examined and taken into account for analyzing the performance of the storage system

Paris-Sud XI, Université de

490

JOURNALDE PHYSIQUE IV Colloque C7, supplkment au Journal de PhysiqueID,Volume 4,juillet 1994  

E-Print Network [OSTI]

Thermal diffusivities of thin films measured by transient thermal gratings O.W. ~ a d i n ~ ( l ) ,H relaxation, governed dl= dR--dT by the thermal diffusivity, can be de- tected by monitoring the decay Research Lab., Wilhelm-Runge-Strasse 11, 89081 Ulm, Germany Article published online by EDP Sciences

Paris-Sud XI, Université de

491

University of California Santa Cruz University Library  

E-Print Network [OSTI]

for Research, Teaching, and Cultural Enrichment. The Project Manager will be will be a member of the Grateful project plans including goals and deliverables, resources, budget, and time line, consulting. Manage project resources to optimize work and project delivery Essential -Lead cross-functional teams

California at Santa Cruz, University of

492

Extra Crispy OvenFried Drumsticks 3 cups cornflake cereal, crushed  

E-Print Network [OSTI]

Extra Crispy OvenFried Drumsticks 3 cups cornflake cereal, crushed 1/3 cup grated Parmesan pepper sauce 8 chicken drumsticks, skinned Vegetable cooking spray 1. Combine buttermilk and hot pepper sauce in an extralarge ziptop freezer bag. Add chicken drumsticks, turning to coat. Place bag

Jawitz, James W.

493

X-ray spectroscopy of low-mass X-ray binaries  

E-Print Network [OSTI]

I present high-resolution X-ray grating spectroscopy of neutron stars in low-mass X-ray binaries (LMXBs) using instruments onboard the Chandra X-ray Observatory and the X-ray Multi-Mirror Mission (XMM-Newton). The first ...

Juett, Adrienne Marie, 1976-

2004-01-01T23:59:59.000Z

494

A Diffractive-Optic Telescope for X-Ray Astronomy D. Dewey, T.H. Markert, and M.L. Schattenburg  

E-Print Network [OSTI]

A Diffractive-Optic Telescope for X-Ray Astronomy D. Dewey, T.H. Markert, and M.L. Schattenburg for a light-weight X-ray astronomical telescope that uses a diffractive optical element is described (200-1000 cm2 ) through the use of a blazed diffractive optic. State-of-the-art grating technology

Dewey, Daniel

495

FAST AND ACCURATE VISIBILITY PREPROCESSING A DISSERTATION  

E-Print Network [OSTI]

FOR THE DEGREE OF DOCTOR OF PHILOSOPHY By Shaun Nirenstein October 2003 Supervised by E.H. Blake #12;c Copyright;Acknowledgements I would like to thank my supervisor, Professor Edwin Blake. Without his unrelenting confidence and Gary Oberholster, who implemented the parallel preprocessor outlined in Section 4.5. I am grateful

Blake, Edwin

496

A&A manuscript no. (will be inserted by hand later)  

E-Print Network [OSTI]

Max­Planck­Institut f¨ur extraterrestrische Physik, Postfach 1603, D--85740 Garching, Germany 3 ISO for the grating sections are â??=ffiâ?? ¸ 10000. Any remaining errors in the wavelength scale are dominated is described in Schaeidt et al (1996). Pre­flight the wavelength calibration of the two grat­ ing sections

497

Astron. Astrophys. 315, L49L54 (1996) ASTROPHYSICS  

E-Print Network [OSTI]

-Planck-Institut f¨ur Extraterrestrische Physik, Postfach 1603, D-85740 Garching, Germany 3 ISO Science Operations observations, from the near to the far infrared, over 6 octaves. The instrument has two grating sections to 2000. With its Fabry-Perot (F-P) etalons located at the out- put of the long-wavelength (LW) section

Spoon, Henrik

498

Future of the Grid Massoud Amin*, D.Sc.  

E-Print Network [OSTI]

of Electrical & Computer Engineering Center for the Dev. of Technological leadership University of Minnesota at EPRI is gratefully acknowledged. EPRI Grid Reliability & Power Markets Enterprise Information Security Expenses & Investments (1990 = 1) Maintenance Capital Investment Source: FERC, EIA #12;6 Power Law

Amin, S. Massoud

499

IEEE TRANSACTIONS ON ELECTRON DEVICES, VOL. 48, NO. 11, NOVEMBER 2001 2525 A Complementary Bipolar Technology Family With  

E-Print Network [OSTI]

IEEE TRANSACTIONS ON ELECTRON DEVICES, VOL. 48, NO. 11, NOVEMBER 2001 2525 A Complementary Bipolar. Even though the complementary bipolar process technology drives a smaller part of the market than core a very important segment of the overall inte- grated circuit market. Specifically, a high

Bashir, Rashid

500

SMART-X, "Square Meter, Arcsecond Resolution X-ray Telescope" A. Vikhlinina, P. Reida, H. Tananbauma, D. A. Schwartza, W. R. Formana, C. Jonesa, J. Bookbindera,  

E-Print Network [OSTI]

SMART-X, "Square Meter, Arcsecond Resolution X-ray Telescope" A. Vikhlinina, P. Reida, HJohn Hopkins University, 3400 North Charles Street Baltimore, MD 21211 ABSTRACT SMART-X is a mission concept microcalorimeter, 22 FOV imager, and high-throughput gratings. 1. OVERVIEW We describe the Square Meter Arcsecond