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Note: This page contains sample records for the topic "differential scanning calorimetry" from the National Library of EnergyBeta (NLEBeta).
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they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


1

Differential scanning calorimetry of metamict Pu-substituted zirconolite  

DOE Green Energy (OSTI)

Samples of CaPuTi/sub 2/O/sub 7/ were prepared by cold pressing and sintering. Plutonium was substituted for zirconium in order to characterize radiation damage effects. The energy stored in a sample which had reached saturation in swelling after storage at ambient temperature was measured with a differential scanning calorimeter. The total energy of 6.6 +- 0.1 cal/g is released over the range 485 to 715/sup 0/C. The activation energy of annealing of the damage is 1.22 +- 0.05 eV. The temperature dependence of the rate constant is described by k/sub T/ = 5.96E4 exp(-1.22/k/sub B/T) s/sup -1/ where kB and T are the Boltzmann's constant and temperature (K) respectively. A sample stored at 600/sup 0/C was similarly evaluated and showed no release of stored energy to the precision of the apparatus (+- 0.1 cal/g). These results are applied to analysis of waste incorporation in SYNROC and are correlated with analogous parameters for other materials.

Peterson, D.E.; Clinard, F.W. Jr.

1982-01-01T23:59:59.000Z

2

Analysis of Lipid OxidationChapter 7 Analysis of Lipid Oxidation by Differential Scanning Calorimetry  

Science Conference Proceedings (OSTI)

Analysis of Lipid Oxidation Chapter 7 Analysis of Lipid Oxidation by Differential Scanning Calorimetry Methods and Analyses eChapters Methods - Analyses Books BAB4134A719DCAA7BC0E57797CDA7C80 AOCS Press Downloadable pd

3

Parallel nano-Differential Scanning Calorimetry: A New Device for Combinatorial Analysis of Complex nano-Scale Material Systems  

E-Print Network (OSTI)

1 Parallel nano-Differential Scanning Calorimetry: A New Device for Combinatorial Analysis of Complex nano-Scale Material Systems Patrick James McCluskey, and Joost J. Vlassak Division of Engineering is presented for the combinatorial analysis of complex nano-scale material systems. The parallel nano

4

Crystallization and Solidification Properties of LipidsChapter 3 Simultaneous Exam Structural/Thermal Behaviors of Fatsby Coupled X-ray Diffraction and Differential Scanning Calorimetry  

Science Conference Proceedings (OSTI)

Crystallization and Solidification Properties of Lipids Chapter 3 Simultaneous Exam Structural/Thermal Behaviors of Fatsby Coupled X-ray Diffraction and Differential Scanning Calorimetry Health Nutrition Biochemistry eChapters Health - N

5

Crystallization and Solidification Properties of LipidsChapter 6 Differential Scanning Calorimetry as a Means of Predicting ChocolateFat-Blooming  

Science Conference Proceedings (OSTI)

Crystallization and Solidification Properties of Lipids Chapter 6 Differential Scanning Calorimetry as a Means of Predicting ChocolateFat-Blooming Health Nutrition Biochemistry eChapters Health - Nutrition - Biochemistry 32CF4809AFB026A

6

Kinetics of Cold-Cap Reactions for Vitrification of Nuclear Waste Glass Based on Simultaneous Differential Scanning Calorimetry - Thermogravimetry (DSC-TGA) and Evolved Gas Analysis (EGA)  

Science Conference Proceedings (OSTI)

For vitrifying nuclear waste glass, the feed, a mixture of waste with glass-forming and modifying additives, is charged onto the cold cap that covers 90?100% of the melt surface. The cold cap consists of a layer of reacting molten glass floating on the surface of the melt in an all-electric, continuous glass melter. As the feed moves through the cold cap, it undergoes chemical reactions and phase transitions through which it is converted to molten glass that moves from the cold cap into the melt pool. The process involves a series of reactions that generate multiple gases and subsequent mass loss and foaming significantly influence the mass and heat transfers. The rate of glass melting, which is greatly influenced by mass and heat transfers, affects the vitrification process and the efficiency of the immobilization of nuclear waste. We studied the cold-cap reactions of a representative waste glass feed using both the simultaneous differential scanning calorimetry-thermogravimetry (DSC-TGA) and the thermogravimetry coupled with gas chromatography-mass spectrometer (TGA-GC-MS) as complementary tools to perform evolved gas analysis (EGA). Analyses from DSC-TGA and EGA on the cold-cap reactions provide a key element for the development of an advanced cold-cap model. It also helps to formulate melter feeds for higher production rate.

Rodriguez, Carmen P.; Pierce, David A.; Schweiger, Michael J.; Kruger, Albert A.; Chun, Jaehun; Hrma, Pavel R.

2013-12-03T23:59:59.000Z

7

Synergistic use of Knudsen effusion quadrupole mass spectrometry, solid-state galvanic cell and differential scanning calorimetry for thermodynamic studies on lithium aluminates  

SciTech Connect

Three ternary oxides LiAl{sub 5}O{sub 8}(s), LiAlO{sub 2}(s) and Li{sub 5}AlO{sub 4}(s) in the system Li-Al-O were prepared by solid-state reaction route and characterized by X-ray powder diffraction method. Equilibrium partial pressure of CO{sub 2}(g) over the three-phase mixtures {l_brace}LiAl{sub 5}O{sub 8}(s)+Li{sub 2}CO{sub 3}(s)+5Al{sub 2}O{sub 3}(s){r_brace}, {l_brace}LiAl{sub 5}O{sub 8}(s)+5LiAlO{sub 2}(s)+2Li{sub 2}CO{sub 3}(s){r_brace} and {l_brace}LiAlO{sub 2}(s)+Li{sub 5}AlO{sub 4}(s)+2Li{sub 2}CO{sub 3}(s){r_brace} were measured using Knudsen effusion quadrupole mass spectrometry (KEQMS). Solid-state galvanic cell technique based on calcium fluoride electrolyte was used to determine the standard molar Gibbs energies of formations of these aluminates. The standard molar Gibbs energies of formation of these three aluminates calculated from KEQMS and galvanic cell measurements were in good agreement. Heat capacities of individual ternary oxides were measured from 127 to 868 K using differential scanning calorimetry. Thermodynamic tables representing the values of {delta}{sub f}H{sup 0}(298.15 K), S{sup 0}(298.15 K) S{sup 0}(T), C{sub p}{sup 0}(T), H{sup 0}(T), {l_brace}H{sup 0}(T)-H{sup 0}(298.15 K){r_brace}, G{sup 0}(T), {delta}{sub f}H{sup 0}(T), {delta}{sub f}G{sup 0}(T) and free energy function (fef) were constructed using second law analysis and FACTSAGE thermo-chemical database software. - Graphical abstract: Comparison of {delta}{sub f}G{sub m}{sup 0} of ternary oxides determined from KEQMS and solid-state galvanic cell techniques. (O) KEQMS, (9632;) solid-state galvanic cell and solid line: combined fit of both the experimental data.

Rakshit, S.K. [Product Development Section, Radiochemistry and Isotope Group, Bhabha Atomic Research Centre, Trombay, Mumbai 400085 (India)], E-mail: swarupkr@barc.gov.in; Naik, Y.P.; Parida, S.C.; Dash, Smruti; Singh, Ziley; Sen, B.K.; Venugopal, V. [Product Development Section, Radiochemistry and Isotope Group, Bhabha Atomic Research Centre, Trombay, Mumbai 400085 (India)

2008-06-15T23:59:59.000Z

8

149_06 Differential Scanning Calorimetry  

Science Conference Proceedings (OSTI)

AOCS Press, Urbana, IL 61802 ©2001 by AOCS Press. All rights reserved. No part of this PDF may be repro-

9

Measurement and Model Validation of Nanofluid Specific Heat Capacity with Differential Scanning Calorimetry  

E-Print Network (OSTI)

Nanofluids are being considered for heat transfer applications; therefore it is important to know their thermophysical properties accurately. In this paper we focused on nanofluid specific heat capacity. Currently, there ...

O'Hanley, Harrison F.

10

Measurement of Specific Heat Capacity Using Differential Scanning Calorimeter  

SciTech Connect

This document describes the process used at the Idaho National Laboratory’s (INL) High Temperature Test Laboratory (HTTL) for measuring specific heat capacity using a differential scanning calorimeter (DSC). The document is divided into four sections: Approach, in which the technique is described; Setup, in which the physical system is described; Procedure, in which the testing steps are listed and detailed; and Example Test, in which a typical test is outlined following the steps listed in the Procedure section. Example data, results, photos, and curves are provided throughout the document to assist other users of this system.

J. E. Daw

2008-11-01T23:59:59.000Z

11

Method and apparatus for differential spectroscopic atomic-imaging using scanning tunneling microscopy  

DOE Patents (OSTI)

A Method and apparatus for differential spectroscopic atomic-imaging is disclosed for spatial resolution and imaging for display not only individual atoms on a sample surface, but also bonding and the specific atomic species in such bond. The apparatus includes a scanning tunneling microscope (STM) that is modified to include photon biasing, preferably a tuneable laser, modulating electronic surface biasing for the sample, and temperature biasing, preferably a vibration-free refrigerated sample mounting stage. Computer control and data processing and visual display components are also included. The method includes modulating the electronic bias voltage with and without selected photon wavelengths and frequency biasing under a stabilizing (usually cold) bias temperature to detect bonding and specific atomic species in the bonds as the STM rasters the sample. This data is processed along with atomic spatial topography data obtained from the STM raster scan to create a real-time visual image of the atoms on the sample surface.

Kazmerski, Lawrence L. (Lakewood, CO)

1990-01-01T23:59:59.000Z

12

A-24: Application of Fast Scanning Calorimetry in the Rapid ...  

Science Conference Proceedings (OSTI)

... as Shielding Materials for Electromagnetic Interference and Radiation Shielding ... for Nuclear Power Plant Steam Generators during Cold-Working Process.

13

Development and Deployment of a Compact Eye-safe Scanning Differential Absorption Lidar (DIAL) for Spatial Mapping of Carbon Dioxide for MVA at Geologic Carbon Sequestration Sites  

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

Deployment of a Deployment of a Compact Eye-safe Scanning Differential Absorption Lidar (DIAL) for Spatial Mapping of Carbon Dioxide for MVA at Geologic Carbon Sequestration Sites Description Through its core research and development program administered by the National Energy Technology Laboratory (NETL), the U.S. Department of Energy (DOE) emphasizes monitoring, verification, and accounting (MVA), as well as computer simulation, of possible carbon dioxide (CO 2 ) leakage at CO 2

14

High-temperature heat-capacity measurements and critical property determinations using a Differential Scanning Calorimeter: Results of measurements on toluene, tetralin, and JP-10  

Science Conference Proceedings (OSTI)

Liquid-phase heat capacities (from near 300 K to near the critical temperature) and critical properties were determined for toluene, tetralin, and the specialty fuel JP-10 with a Differential Scanning Calorimeter (DSC) using high-temperature/high-pressure sample cells and procedural methods developed at NIPER. A complete description of the methods and calculational procedures is included as an appendix to the report. The results for toluene and tetralin compare very favorably with available literature values, while those for JP-10 are the first reported high-temperature heat capacity and critical property measurements for this material. This research was completed to demonstrate the type and scope of measurements needed for materials key to new process development, and in particular to the development of ''endothermic fuels'' for the development of new High-Speed Flight Vehicles. 20 refs., 5 figs., 21 tabs.

Steele, W.V.; Chirico, R.D.; Knipmeyer, S.E.; Smith, N.K.

1989-06-01T23:59:59.000Z

15

Extracting longitudinal shower development information from crystal calorimetry plus tracking  

E-Print Network (OSTI)

crystal calorimetry plus tracking D.N. Brown a , J. Ilic b ,calorimeter by using tracking information. Ourgood three- dimensional tracking resolution of B A B AR ,

Brown, D.N.

2008-01-01T23:59:59.000Z

16

Ultra-Fast Calorimetry for Studies of Crystallization in ...  

Science Conference Proceedings (OSTI)

Presentation Title, Ultra-Fast Calorimetry for Studies of Crystallization in Chalcogenides for Phase-Change Memory. Author(s), A. L. Greer. On-Site Speaker ...

17

Calorimetry for ILC Experiments: CALICE Collaboration R&D  

E-Print Network (OSTI)

The CALICE Collaboration is carrying out research and development into calorimetry for a detector at the International Linear Collider (ILC). CALICE is investigating a range of technologies for both electromagnetic and hadronic calorimetry. An overview of the prototypes and selected test-beam results are presented.

D. S. Bailey; for the CALICE Collaboration

2008-10-20T23:59:59.000Z

18

Isothermal calorimetry investigation of Li{sub 1+x}Mn{sub 2-y}Al{sub z}O{sub 4} spinel.  

DOE Green Energy (OSTI)

The heat generation of LiMn{sub 2}O{sub 4}, Li{sub 1.156}Mn{sub 1.844}O{sub 4}, and Li{sub 1.06}Mn{sub 1.89}Al{sub 0.05}O{sub 4} spinel cathode materials in a half-cell system was investigated by isothermal micro-calorimetry (IMC). The heat variations of the Li/LiMn{sub 2}O{sub 4} cell during charging were attributed to the LiMn{sub 2}O{sub 4} phase transition and order/disorder changes. This heat variation was largely suppressed when the stoichiometric spinel was doped with excess lithium or lithium and aluminum. The calculated entropy change (dE/dT) from the IMC confirmed that the order/disorder change of LiMn{sub 2}O{sub 4}, which occurs in the middle of the charge, was largely suppressed with lithium or lithium and aluminum doping. The dE/dT values obtained did not agree between the charge and the discharge at room temperature (25 C), which was attributed to cell self-discharge. This discrepancy was not observed at low temperature (10 C). Differential scanning calorimeter (DSC) results showed that the fully charged spinel with lithium doping has better thermal stability.

Lu, W.; Belharouak, I.; Park, S. H.; Sun, Y. K; Amine, K.; Chemical Engineering; Hanyang Univ.

2007-05-25T23:59:59.000Z

19

Application of kinetic inductance thermometers to x-ray calorimetry  

SciTech Connect

A kinetic inductance thermometer is applied to x-ray calorimetry, and its operation over a wide range of frequencies and geometries is discussed. Three amplifier configurations are described, one using a superconducting quantum interference device (SQUID) amplifier, another incorporating an FET amplifier in an amplitude modulated system, and the third, using a tunnel diode frequency modulated oscillator circuit. The predicted performance of each configuration is presented. 13 refs., 6 figs., 1 tab.

Wai, Y.C.; Labov, S.E.; Silver, E.H.

1990-08-13T23:59:59.000Z

20

The Philosophy and Feasibility of Dual Readout Calorimetry  

SciTech Connect

I will discuss the general physical ideas behind dual-readout calorimetry, their implementation in DREAM (Dual REAdout Module) with exact separation of scintillation and Cerenkov light, implementation with mixed light in DREAM fibers, anticipated implementation in PbWO4 crystals with applications to the 4th Concept detector and to CMS, use in high energy gamma-ray and cosmic ray astrophysics with Cerenkov and N2 fluorescent light, and implementation in the 4th Concept detector for muon identification.

Hauptman, John [Physics, Iowa State University, Ames IA 50011 (United States)

2006-10-27T23:59:59.000Z

Note: This page contains sample records for the topic "differential scanning calorimetry" 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

NEUTRON-ENHANCED CALORIMETRY FOR HADRONS (NECH): FINAL REPORT  

SciTech Connect

We present the results of a project to apply scintillator technology recently developed at Louisiana Tech University to hadronic calorimetry. In particular, we developed a prototype calorimeter module incorporating scintillator embedded with metal oxide nanoparticles as the active layers. These metal oxide nanoparticles of gadolinium oxide, have high cross-sections for interactions with slow neutrons. As a part fo this research project, we have developed a novel method for producing plastic scintillators with metal oxide nanoparticles evenly distributed through the plastic without aggregation.We will test the performance of the calorimeter module in test beam and with a neutron source, in order to measure the response to the neutron component of hadronic showers. We will supplement our detector prototyping activities with detailed studies of the effect of neutron component on the resolution of hadronic energy measurements, particular in the next generation of particle flow calorimeters.

Andrew Stroud, Lee Sawyer

2012-08-31T23:59:59.000Z

22

Commissioning of the calorimetry in the ATLAS tau trigger system  

E-Print Network (OSTI)

Calorimeters are fundamental in the three levels of the ATLAS tau trigger system. The first level trigger (L1) uses the electromagnetic (e.m.) and hadronic (had) calorimeters to make its decision. In the High Level Triggers (HLT), these systems are also crucial: both the second level trigger (L2) and the third level trigger (Event Filter -EF) heavily exploit the calorimeter based information to identify tau leptons decaying hadronically. Whilst the granularity of the first level is coarse, the second and third level triggers have the final full detector read-out. This contribution focuses on the commissioning of the calorimetry in the three levels of the tau trigger in real data. Efficiency measurements with respect to tau candidates reconstructed by the offline algorithms, and distributions of calorimeter based tau information reconstructed at trigger level, are compared to prediction of the Monte Carlo and the trigger performance in first data assessed.

Sfyrla, Anna; The ATLAS collaboration

2010-01-01T23:59:59.000Z

23

Commissioning of the calorimetry in the ATLAS tau trigger system  

E-Print Network (OSTI)

Calorimeters are fundamental in the three levels of the ATLAS tau trigger system. The first level trigger (L1) uses the electromagnetic (EM) and hadronic (HAD) calorimeters to make its decision. In the High Level Triggers (HLT), these systems are also crucial: both the second level trigger (L2) and the third level trigger (Event Filter -EF) heavily exploit the calorimeter based information to identify tau leptons decaying hadronically. Whilst the granularity of the first level is coarse, the second and third level triggers have the final full detector read-out. This contribution focuses on the commissioning of the calorimetry in the three levels of the tau trigger in real data. Efficiency measurements with respect to tau candidates reconstructed by the offline algorithms, and distributions of calorimeter based tau information reconstructed at trigger level, are compared to prediction of the Monte Carlo and the trigger performance in first data assessed.

Sfyrla, Anna; The ATLAS collaboration

2010-01-01T23:59:59.000Z

24

Free Motion Scanning System  

DOE Patents (OSTI)

The present invention relates to an ultrasonic scanner and method for the imaging of a part surface, the scanner comprising: a probe assembly spaced apart from the surface including at least two tracking signals for emitting electromagnetic radiation and a transmitter for emitting ultrasonic waves onto a surface in order to induce at least a portion of said waves to be reflected from the surface, at least one detector for receiving the electromagnetic radiation wherein the detector is positioned to receive said radiation from the tracking signals, an analyzing means for recognizing a three-dimensional location of the tracking signals based on said emitted electromagnetic radiation, a differential conversion means for generating an output signal representative of the waveform of the reflected waves, and a means for relating said tracking signal location with the output signal and projecting an image of the resulting data. The scanner and method are particularly useful to acquire ultrasonic inspection data by scanning the probe-over a complex part surface in an arbitrary scanning pattern.

Sword, Charles K.

1998-06-18T23:59:59.000Z

25

Thermochimica Acta 331 (1999) 93204 Reference materials for calorimetry and differential thermal analysis  

E-Print Network (OSTI)

sample a higher-resolution exemplar. This magnification is performed in the final surface shader and thus, runtime evaluation is simple and parallel, and is therefore achievable in the GPU pixel shader [Wei 2004 of nonadjacent pixels, but current GPU pixel shaders do not support efficient branching on such fine granularity

Chickos, James S.

26

An isoperibol calorimeter for the investigation of biochemical kinetics and isothermal titration calorimetry  

E-Print Network (OSTI)

Isothermal titration calorimetry is a technique used to measure the enthalpy change associated with a molecular binding interaction. From these data, the binding constant for the reaction can be determined. In the scope ...

Amadi, Ovid Charles

2007-01-01T23:59:59.000Z

27

Thermal and electrical characterization of a micro-hotplate for calorimetry  

E-Print Network (OSTI)

This thesis characterizes a micro-hotplate designed at Draper Laboratory. This hotplate will be integrated into a calorimetry system that measures the heat released or absorbed by a reaction. An analytical thermal model ...

Baliga, Radhika

2004-01-01T23:59:59.000Z

28

Development of GEM-Based Digital Hadron Calorimetry Using the SLAC KPiX Chip  

Science Conference Proceedings (OSTI)

The development of Digital Hadron Calorimetry for the SiD detector Concept for the International Linear Collider is described. The jet energy requirements of the ILC physics program are discussed. The concept of GEM-based digital hadron calorimetry is presented, followed by a description of, and results from, prototype detectors. Plans are described for the construction of 1m{sup 2} GEM-DHCAL planes to be tested as part of a future calorimeter stack.

White, A.; /Texas U., Arlington /Washington U., Seattle /Unlisted /SLAC

2012-04-12T23:59:59.000Z

29

--No Title--  

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

This EEC is for conducting thermal analyses including, Thermagravimetric Analysis (TGA), Differential Scanning Calorimetry (DSC), Differential Thermal Analysis (DTA), in the 773-A...

30

--No Title--  

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

Perform thermal analysis and thermal exposures using ThermoGravimetric Analysis (TGA), Differential Scanning Calorimetry (DSC), and Differential Thermal Analysis (DTA) which may...

31

Final Technical Report Ã?¢Ã?Â?Ã?Â? CMS FAST OPTICAL CALORIMETRY  

SciTech Connect

This is the final report of CMS FAST OPTICAL CALORIMETRY, a grant to Fairfield University for development, construction, installation and operation of the forward calorimeter on CMS, and for upgrades of the forward and endcap calorimeters for higher luminosity and radiation damage amelioration.

David R Winn

2012-07-12T23:59:59.000Z

32

Scanning Electron Microscopy (SEM)  

Science Conference Proceedings (OSTI)

...The scanning electron microscope provides a valuable combination of high resolution imaging, elemental analysis, and recently, crystallographic analysis: Imaging of features as small as sim 10 nm or less, roughly 100 times smaller than can be seen with...

33

Vector generator scan converter  

DOE Patents (OSTI)

High printing speeds for graphics data are achieved with a laser printer by transmitting compressed graphics data from a main processor over an I/O (input/output) channel to a vector generator scan converter which reconstructs a full graphics image for input to the laser printer through a raster data input port. The vector generator scan converter includes a microprocessor with associated microcode memory containing a microcode instruction set, a working memory for storing compressed data, vector generator hardward for drawing a full graphic image from vector parameters calculated by the microprocessor, image buffer memory for storing the reconstructed graphics image and an output scanner for reading the graphics image data and inputting the data to the printer. The vector generator scan converter eliminates the bottleneck created by the I/O channel for transmitting graphics data from the main processor to the laser printer, and increases printer speed up to thirty fold.

Moore, James M. (Livermore, CA); Leighton, James F. (Livermore, CA)

1990-01-01T23:59:59.000Z

34

Vector generator scan converter  

DOE Patents (OSTI)

High printing speeds for graphics data are achieved with a laser printer by transmitting compressed graphics data from a main processor over an I/O channel to a vector generator scan converter which reconstructs a full graphics image for input to the laser printer through a raster data input port. The vector generator scan converter includes a microprocessor with associated microcode memory containing a microcode instruction set, a working memory for storing compressed data, vector generator hardware for drawing a full graphic image from vector parameters calculated by the microprocessor, image buffer memory for storing the reconstructed graphics image and an output scanner for reading the graphics image data and inputting the data to the printer. The vector generator scan converter eliminates the bottleneck created by the I/O channel for transmitting graphics data from the main processor to the laser printer, and increases printer speed up to thirty fold. 7 figs.

Moore, J.M.; Leighton, J.F.

1988-02-05T23:59:59.000Z

35

Scanning computed confocal imager  

DOE Patents (OSTI)

There is provided a confocal imager comprising a light source emitting a light, with a light modulator in optical communication with the light source for varying the spatial and temporal pattern of the light. A beam splitter receives the scanned light and direct the scanned light onto a target and pass light reflected from the target to a video capturing device for receiving the reflected light and transferring a digital image of the reflected light to a computer for creating a virtual aperture and outputting the digital image. In a transmissive mode of operation the invention omits the beam splitter means and captures light passed through the target.

George, John S. (Los Alamos, NM)

2000-03-14T23:59:59.000Z

36

Application of isothermal calorimetry and uv spectroscopy for stability monitoring of pentaerythritol tetranitrate  

SciTech Connect

Thermal stabilities for a series of pentaerythritol-tetranitrate (PETN) samples with variable surf ace areas were monitored by isothermal calorimetry and UV spectroscopy over the temperature range of 363 to 408 K. Isothermal induction times measured with constant volume calorimetry under an air atmosphere and No evolution rates monitored by UV absorbance at 213 nm under vacuum correlated with the PETN surface area at temperatures equal to or exceeding 383 K. Rate data measured at 383 K are in accord with predictions based on detailed kinetic modeling. Below 383 K, NO evolution data suggested that additional geometric factors may be significant in controlling PETN stability. Mechanisms for influencing surface area upon the rate-determining step are addressed.

Dosser, L.R.; Pickard, J.M.

1992-01-01T23:59:59.000Z

37

Ultrafast scanning probe microscopy  

DOE Patents (OSTI)

An ultrafast scanning probe microscopy method for achieving subpicosecond-temporal resolution and submicron-spatial resolution of an observation sample. In one embodiment of the present claimed invention, a single short optical pulse is generated and is split into first and second pulses. One of the pulses is delayed using variable time delay means. The first pulse is then directed at an observation sample located proximate to the probe of a scanning probe microscope. The scanning probe microscope produces probe-sample signals indicative of the response of the probe to characteristics of the sample. The second pulse is used to modulate the probe of the scanning probe microscope. The time delay between the first and second pulses is then varied. The probe-sample response signal is recorded at each of the various time delays created between the first and second pulses. The probe-sample response signal is then plotted as a function of time delay to produce a cross-correlation of the probe sample response. In so doing, the present invention provides simultaneous subpicosecond-temporal resolution and submicron-spatial resolution of the sample.

Weiss, Shimon (El Cerrito, CA); Chemla, Daniel S. (Kensington, CA); Ogletree, D. Frank (El Cerrito, CA); Botkin, David (San Francisco, CA)

1995-01-01T23:59:59.000Z

38

Ultrafast scanning probe microscopy  

DOE Patents (OSTI)

An ultrafast scanning probe microscopy method is described for achieving subpicosecond-temporal resolution and submicron-spatial resolution of an observation sample. In one embodiment of the present claimed invention, a single short optical pulse is generated and is split into first and second pulses. One of the pulses is delayed using variable time delay means. The first pulse is then directed at an observation sample located proximate to the probe of a scanning probe microscope. The scanning probe microscope produces probe-sample signals indicative of the response of the probe to characteristics of the sample. The second pulse is used to modulate the probe of the scanning probe microscope. The time delay between the first and second pulses is then varied. The probe-sample response signal is recorded at each of the various time delays created between the first and second pulses. The probe-sample response signal is then plotted as a function of time delay to produce a cross-correlation of the probe sample response. In so doing, the present invention provides simultaneous subpicosecond-temporal resolution and submicron-spatial resolution of the sample. 6 Figs.

Weiss, S.; Chemla, D.S.; Ogletree, D.F.; Botkin, D.

1995-05-16T23:59:59.000Z

39

CT calorimetry  

Science Conference Proceedings (OSTI)

... reactions can alter the temperature in various ways, producing a ... The four black items at right below the centimeter rule are ... That way, the immediate ...

2013-01-03T23:59:59.000Z

40

Only critical information was scanned  

Office of Legacy Management (LM)

Only critical information was scanned. Entire document is available upon request - Click here to email a...

Note: This page contains sample records for the topic "differential scanning calorimetry" 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

Scanning micro-sclerometer  

DOE Patents (OSTI)

A scanning micro-sclerometer measures changes in contact stiffness and correlates these changes to characteristics of a scratch. A known force is applied to a contact junction between two bodies and a technique employing an oscillating force is used to generate the contact stiffness between the two bodies. As the two bodies slide relative to each other, the contact stiffness changes. The change is measured to characterize the scratch.

Oliver, Warren C. (Knoxville, TN); Blau, Peter J. (Oak Ridge, TN)

1994-01-01T23:59:59.000Z

42

An Algebra of Scans  

E-Print Network (OSTI)

A parallel prefix circuit takes n inputs x1 , x2 , . . . , xn and produces the n outputs x1 , x1 x2 , . . . , x1 x2 xn , where `#' is an arbitrary associative binary operation. Parallel prefix circuits and their counterparts in software, parallel prefix computations or scans, have numerous applications ranging from fast integer addition over parallel sorting to convex hull problems. A parallel prefix circuit can be implemented in a variety of ways taking into account constraints on size, depth, or fanout. Traditionally, implementations are either defined graphically or by enumerating the underlying graph. Both approaches have their pros and cons. A figure if well drawn conveys the possibly recursive structure of the scan but it is not amenable to formal manipulation. A description in form of a graph while rigorous obscures the structure of a scan and is equally hard to manipulate. In this paper we show that parallel prefix circuits enjoy a very pleasant algebra. Using only two basic building blocks and four combinators all standard designs can be described succinctly and rigorously. The rules of the algebra allow us to prove the circuits correct and to derive circuit designs in a systematic manner. lord darlington. . . . [Sees a fan lying on the table.] And what a wonderful fan! May I look at it? lady windermere. Do. Pretty, isn't it! It's got my name on it, and everything. I have only just seen it myself. It's my husband's birthday present to me. You know to-day is my birthday? --- Oscar Wilde, Lady Windermere's Fan 1

Ralf Hinze

2004-01-01T23:59:59.000Z

43

Water flow calorimetry measurements of heat loads for a volume production H/sup -/ source  

DOE Green Energy (OSTI)

The design of volume-production H/sup -/ sources requires the knowledge of heat loads on the source components. The arc and filament heater power input to a 20 cm diameter x 23 cm long source can be 50 kW or higher, practically all of which is absorbed in the cooling water. Water flow calorimetry measurements were made to determine the heat loads on the bucket walls, grid no. 1, and magnetic filter rods. The measurements are presented for two different filament locations, for three different values of arc power, and for three values of source gas pressure. 1 ref., 4 figs., 2 tabs.

Purgalis, P.; Ackerman, G.; Kwan, J.; Wells, R.P.

1987-10-01T23:59:59.000Z

44

Scanning Confocal Electron Microscope (SCEM)  

Transmission/Scanning Transmission Electron Microscope. The SCEM enables imaging of sub-surface structures of thick, optically opaque materials, ...

45

Microsoft PowerPoint - 100723 SECA Poster_MO-SCI_MS&T (final...  

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

Behavior Liquidus Temperature ( S C ) 500 hr Crystallization and Volatilization in Air DSC Analysis Differential Scanning Calorimetry (DSC) Reveals That The Candidate...

46

Timing-Driven Partial Scan  

Science Conference Proceedings (OSTI)

We present a partial scan approach, which aims at reducing both area overhead and performance degradation caused by test logic. Given a target speed and an initial design that meets the target, the algorithm selects a minimum set of scan flip-flops, ... Keywords: Test algorithms, partial scan, test synthesis, design for test

Jing-yang Jou; Kwang-ting (tim) Cheng

1995-12-01T23:59:59.000Z

47

Feasibility study on using fast calorimetry technique to measure a mass attribute as part of a treaty verification regime  

Science Conference Proceedings (OSTI)

The attribute measurement technique provides a method for determining whether or not an item containing special nuclear material (SNM) possesses attributes that fall within an agreed upon range of values. One potential attribute is whether the mass of an SNM item is larger than some threshold value that has been negotiated as part of a nonproliferation treaty. While the historical focus on measuring mass attributes has been on using neutron measurements, calorimetry measurements may be a viable alternative for measuring mass attributes for plutonium-bearing items. Traditionally, calorimetry measurements have provided a highly precise and accurate determination of the thermal power that is being generated by an item. In order to achieve this high level of precision and accuracy, the item must reach thermal equilibrium inside the calorimeter prior to determining the thermal power of the item. Because the approach to thermal equilibrium is exponential in nature, a large portion of the time spent approaching equilibrium is spent with the measurement being within {approx}10% of its final equilibrium value inside the calorimeter. Since a mass attribute measurement only needs to positively determine if the mass of a given SNM item is greater than a threshold value, performing a short calorimetry measurement to determine how the system is approaching thermal equilibrium may provide sufficient information to determine if an item has a larger mass than the agreed upon threshold. In previous research into a fast calorimetry attribute technique, a two-dimensional heat flow model of a calorimeter was used to investigate the possibility of determining a mass attribute for plutonium-bearing items using this technique. While the results of this study looked favorable for developing a fast calorimetry attribute technique, additional work was needed to determine the accuracy of the model used to make the calculations. In this paper, the results from the current work investigating the fast calorimetry attribute technique will be presented.

Hauck, Danielle K [Los Alamos National Laboratory; Bracken, David S [Los Alamos National Laboratory; Mac Arthur, Duncan W [Los Alamos National Laboratory; Santi, Peter A [Los Alamos National Laboratory; Thron, Jonathan [Los Alamos National Laboratory

2010-01-01T23:59:59.000Z

48

Final Report [Dual-Readout Calorimetry for High-Quality Energy Measurements  

Science Conference Proceedings (OSTI)

This document constitutes the final report on the project ”Dual-Readout Calorimetry for High- Quality Energy Measurements”. The project was carried out by a consortium of US and Italian physicists, led by Dr. Richard Wigmans (Texas tech University). This consortium built several particle detectors and tested these at the European Center for Nuclear Research (CERN) in Geneva, Switzerland. The idea arose to use scintillating crystals as dual-readout calorimeters. Such crystals were of course already known to provide excellent energy resolution for the detection of particles developing electromagnetic (em) showers. The efforts to separate the signals from scintillating crystals into scintillation and Cerenkov components led to four different methods by which this could be accomplished. These methods are based on a) the directionality, b) spectral differences, c) the time structure and d) the polarization of the signals.

Wigmans, Richard; Nural, Akchurin

2013-09-01T23:59:59.000Z

49

A Networked Scanning Electron Microscope  

Science Conference Proceedings (OSTI)

Featured Overview. A New Paradigm—Multi-User Scanning Electron Microscopy. L.S. Chumbley, M. Meyer, K. Fredrickson, and F.C. Laabs. Introduction; System ...

50

A Portable Airborne Scanning Lidar System for Ocean and Coastal Applications  

Science Conference Proceedings (OSTI)

A portable compact airborne scanning lidar system based on the Riegl LMS-Q240i has been developed and its functionality demonstrated for oceanographic and coastal measurements. Differential GPS (DGPS) and an inertial navigation system are ...

Benjamin D. Reineman; Luc Lenain; David Castel; W. Kendall Melville

2009-12-01T23:59:59.000Z

51

DIFFERENTIAL ANALYZER  

DOE Patents (OSTI)

Improvements in analog eomputing machines of the class capable of evaluating differential equations, commonly termed differential analyzers, are described. In general form, the analyzer embodies a plurality of basic computer mechanisms for performing integration, multiplication, and addition, and means for directing the result of any one operation to another computer mechanism performing a further operation. In the device, numerical quantities are represented by the rotation of shafts, or the electrical equivalent of shafts.

Sorensen, E.G.; Gordon, C.M.

1959-02-10T23:59:59.000Z

52

Scanning/Transmission Electron Microscopes  

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

ScanningTransmission Electron Microscopes Nion UltraSTEM 60-100 dedicated aberration-corrected STEM for low- to mid-voltage operation and Enfina EELS Contact: Juan-Carlos Idrobo,...

53

Transverse section radionuclide scanning system  

DOE Patents (OSTI)

This invention provides a transverse section radionuclide scanning system for high-sensitivity quantification of brain radioactivity in cross-section picture format in order to permit accurate assessment of regional brain function localized in three-dimensions. High sensitivity crucially depends on overcoming the heretofore known raster type scanning, which requires back and forth detector movement involving dead-time or partial enclosure of the scan field. Accordingly, this invention provides a detector array having no back and forth movement by interlaced detectors that enclose the scan field and rotate as an integral unit around one axis of rotation in a slip ring that continuously transmits the detector data by means of laser emitting diodes, with the advantages that increased amounts of data can be continuously collected, processed and displayed with increased sensitivity according to a suitable computer program.

Kuhl, David E. (Rosemont, PA); Edwards, Roy Q. (Plymouth Township, PA)

1976-01-01T23:59:59.000Z

54

DCal: A custom integrated circuit for calorimetry at the International Linear Collider  

SciTech Connect

A research and development collaboration has been started with the goal of producing a prototype hadron calorimeter section for the purpose of proving the Particle Flow Algorithm concept for the International Linear Collider. Given the unique requirements of a Particle Flow Algorithm calorimeter, custom readout electronics must be developed to service these detectors. This paper introduces the DCal or Digital Calorimetry Chip, a custom integrated circuit developed in a 0.25um CMOS process specifically for this International Linear Collider project. The DCal is capable of handling 64 channels, producing a 1-bit Digital-to-Analog conversion of the input (i.e. hit/no hit). It maintains a 24-bit timestamp and is capable of operating either in an externally triggered mode or in a self-triggered mode. Moreover, it is capable of operating either with or without a pipeline delay. Finally, in order to permit the testing of different calorimeter technologies, its analog front end is capable of servicing Particle Flow Algorithm calorimeters made from either Resistive Plate Chambers or Gaseous Electron Multipliers.

Hoff, James R.; Mekkaoui, Abderrazek; Yarema, Ray; /Fermilab; Drake, Gary; Repond, Jose; /Argonne

2005-10-01T23:59:59.000Z

55

Scan  

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

NAME OF PERSON WITH WHOM TO CONFER TELEPHONE DATE ARCHIVIST OF THE UNITED STATES Sharon Evelin NUMBER 1 301 -903-3455 i 1 - I REQUEST FOR REe?RDS DISPOSITION AUTHORITY NUMBER /dl- Y s + - o + - / TO: NATIONAL ARCH~VES & RECORDS ADMINISTRATION 8601 ADELPHI ROAD COLLEGE PARK, MD 20740-6001 1. FROM (Agency or establ~shment) U.S. DEPARTMENT OF ENERGY MAJOR SUBDIVISION Office of the Chief Information Officer MINOR SUBDIVISION Records Management Division I 1 8. DESCRIPTION OF ITEM AND PROPOSED DISPOSITION 1 9. GRS OR 1 10. A ~ T I O r Date received I Z L U V - ~ NOTIFICATION TO AGENCY In accordance with the provlslons of 44 U.S.C 3303a, the dlsposltlon request, Including amendments, 1 s approved except for Items that may be marked "dlsposltion not approved" or "withdrawn" In column 10.

56

April Conferences Focus on Scanning Advances  

Science Conference Proceedings (OSTI)

... of the scanning electron microscope (SEM) in ... and helium ion microscopes— have unlocked ... of SEM, scanning ion microscopy, quality assurance in ...

2011-07-19T23:59:59.000Z

57

Operational Monitoring of Radar Differential Reflectivity Using the Sun  

Science Conference Proceedings (OSTI)

A method for the daily monitoring of the differential reflectivity bias for polarimetric weather radars is presented. Sun signals detected in polar volume data produced during operational scanning of the radar are used. This method is an ...

Iwan Holleman; Asko Huuskonen; Rashpal Gill; Pierre Tabary

2010-05-01T23:59:59.000Z

58

Simulating scanning tunneling microscope measurements  

E-Print Network (OSTI)

One of the largest problems in scanning tunneling microscopy design is noise control. It is the burden of the designer to determine if money should be used to build a floating room for vibration isolation or for top-of-the-line ...

Venkatachalam, Vivek

2006-01-01T23:59:59.000Z

59

Scanning x-ray microscope  

Science Conference Proceedings (OSTI)

A scanning x-ray microscope is described including: an x-ray source capable of emitting a beam of x-rays; a collimator positioned to receive the beam of x-rays and to collimate this beam, a focusing cone means to focus the beam of x-rays, directed by the collimator, onto a focal plane, a specimen mount for supporting a specimen in the focal plane to receive the focused beam of x-rays, and x-ray beam scanning means to relatively move the specimen and the focusing cone means and collimator to scan the focused x-ray beam across the specimen. A detector is disposed adjacent the specimen to detect flourescent photons emitted by the specimen upon exposure to the focused beam of x-rays to provide an electrical output representative of this detection. Means are included for displaying and/or recording the information provided by the output from the detector, as are means for providing information to the recording and/or display means representative of the scan rate and position of the focused x-ray beam relative to the specimen whereby the recording and/or display means can correlate the information received to record and/or display quantitive and distributive information as to the quantity and distribution of elements detected in the specimen. Preferably there is provided an x-ray beam modulation means upstream, relative to the direction of emission of the xray beam, of the focusing cone means.

Wang, C.

1982-02-23T23:59:59.000Z

60

Characterisation of the electroless nickel deposit as a barrier layer/under bump metallurgy on IC metallisation  

Science Conference Proceedings (OSTI)

Selective electroless nickel-phosphorus deposits on integrated circuit (IC) metallisation such as copper and aluminium were characterised using differential scanning calorimetry (DSC), X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy ... Keywords: IC metallisation, barrier, crystallisation, electroless

James F. Rohan; Gerald O'Riordan

2003-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "differential scanning calorimetry" 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

A millikelvin scanning tunneling microscope with two independent scanning systems  

E-Print Network (OSTI)

We describe the design, construction and operation of a scanning tunneling microscope (STM) with two tips that can independently acquire simultaneous scans of a sample. The STM is mounted on a dilution refrigerator and the setup includes vibration isolation, rf-filtered wiring, an ultra high vacuum (UHV) sample preparation chamber and sample transfer mechanism. We present images and spectroscopy taken with superconducting Nb tips with the refrigerator at 35 mK that indicate that the effective temperature of our tips/sample is approximately 184 mK, corresponding to an energy resolution of 16 $\\mu$eV. Atomic resolution topographic images of an Au(100) surface taken with the inner and outer tips were found to have root mean square roughness of 1.75 $\\pm$ 0.01 pm and 3.55 $\\pm$ 0.03 pm respectively.

Roychowdhury, A; Anderson, J R; Lobb, C J; Wellstood, F C; Dreyer, M

2013-01-01T23:59:59.000Z

62

Response evolution of the CMS ECAL and R&D studies for electromagnetic calorimetry at the High-Luminosity LHC  

E-Print Network (OSTI)

While the CMS experiment is currently harvesting LHC collision data at CERN, the performance of its electromagnetic calorimeter (ECAL) is being constantly monitored, and work has started to assess the need for changes to the detector to ensure an adequate performance for High-Luminosity LHC (HL-LHC) running, which is planned for 2022 and beyond. In this paper, results from CMS running, beam tests and laboratory measurements are combined to anticipate the detector performance evolution at the HL-LHC. Further, various R&D studies are illustrated, that will provide a useful choice for electromagnetic calorimetry at the HL-LHC.

Francesca Nessi Tedaldi; for the CMS Collaboration

2012-11-16T23:59:59.000Z

63

Cost-free scan: a low-overhead scan path design methodology  

Science Conference Proceedings (OSTI)

Conventional scan design imposes considerable area and delay overhead by using larger scan flip-flops and additional scan wires without utilizing the functionality of the combinational logic. We propose a novel low-overhead scan design methodology, called ... Keywords: Scan design, DFT, Testing

Chih-Chang Lin; Mike Tien-Chien Lee; Malgorzata Marek-Sadowska; Kuang-Chien Chen

1995-12-01T23:59:59.000Z

64

Advanced Photon Source | Combining Scanning Probe Microscopy...  

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

Publications | SXSPM Related Book Chapters V. Rose, J.W. Freeland, S.K. Streiffer, "New Capabilities at the Interface of X-rays and Scanning Tunneling Microscopy", in Scanning...

65

Scan Energy AS | Open Energy Information  

Open Energy Info (EERE)

Scan Energy AS Jump to: navigation, search Name Scan Energy AS Place Dybvad, Denmark Zip DK-9352 Sector Solar, Wind energy Product Denmark-based solar and wind power project...

66

Basic Design of the Scanning Electron Microscope  

Science Conference Proceedings (OSTI)

...H.E. Exner and S. Weinbruch, Scanning Electron Microscopy, Metallography and Microstructures, Vol 9, ASM Handbook,

67

Advantages of Integrating Precession Scanning Transmission ...  

Science Conference Proceedings (OSTI)

Presentation Title, Advantages of Integrating Precession Scanning Transmission Electron Microscopy in the Characterization of Metallic Materials. Author(s) ...

68

ARM: Ka-Band Scanning ARM Cloud Radar (KASACR) Hemispherical Sky RHI Scan (6 horizon-to-horizon scans at 30-degree azimuth intervals)  

DOE Data Explorer (OSTI)

Ka-Band Scanning ARM Cloud Radar (KASACR) Hemispherical Sky RHI Scan (6 horizon-to-horizon scans at 30-degree azimuth intervals)

Nitin Bharadwaj; Kevin Widener

69

N-detection under transparent-scan  

Science Conference Proceedings (OSTI)

We study the quality of test sequences under a test application scheme called transparent-scan as n -detection test sequences. We obtain transparent-scan sequences from combinational test sets. We show that for the same number of clock cycles ... Keywords: n-detection test sets, scan design, test generation

Irith Pomeranz

2005-06-01T23:59:59.000Z

70

Neural network characterization of scanning electron microscopy  

Science Conference Proceedings (OSTI)

A scanning electron microscope (SEM) is a sophisticated equipment employed for fine imaging of processed film surfaces. In this study, a prediction model of scanning electron microscopy was constructed by using a generalized regression neural network ... Keywords: generalized regression neural network, genetic algorithm, model, scanning electron microscope, statistical experiment

Sanghee Kwon; Donghwan Kim; Byungwhan Kim

2008-07-01T23:59:59.000Z

71

Scanning ARM Cloud Radar Handbook  

SciTech Connect

The scanning ARM cloud radar (SACR) is a polarimetric Doppler radar consisting of three different radar designs based on operating frequency. These are designated as follows: (1) X-band SACR (X-SACR); (2) Ka-band SACR (Ka-SACR); and (3) W-band SACR (W-SACR). There are two SACRs on a single pedestal at each site where SACRs are deployed. The selection of the operating frequencies at each deployed site is predominantly determined by atmospheric attenuation at the site. Because RF attenuation increases with atmospheric water vapor content, ARM's Tropical Western Pacific (TWP) sites use the X-/Ka-band frequency pair. The Southern Great Plains (SGP) and North Slope of Alaska (NSA) sites field the Ka-/W-band frequency pair. One ARM Mobile Facility (AMF1) has a Ka/W-SACR and the other (AMF2) has a X/Ka-SACR.

Widener, K; Bharadwaj, N; Johnson, K

2012-06-18T23:59:59.000Z

72

Method for motion tracking during tomographic scanning  

Method for motion tracking during tomographic scanning Note: The technology described above is an early stage opportunity. Licensing rights to this intellectual ...

73

Scanning Probe Microscopy with Spectroscopic Molecular ...  

ORNL researchers developed an innovative imaging method that possesses the imaging capability of scanning near-field ultrasound holography and the che ...

74

Combining Discrete Dislocation Dynamics with Scanning ...  

Science Conference Proceedings (OSTI)

Abstract Scope, Scanning transmission electron microscopy (STEM) is a powerful ... Deformation and Annealing in Zr-2.5Nb by Diffraction Line Profile Analysis.

75

Multifocal Multiphoton Laser-Scanning Structured Illumination ...  

Multifocal Multiphoton Laser-Scanning Structured Illumination Microscopy with Whole-Field Detection Colorado School of Mines. Contact CSM About This Technology

76

Nanomaterials Analysis using a Scanning Electron Microscope ...  

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

Nanomaterials Analysis using a Scanning Electron Microscope Technology available for licensing: Steradian X-ray detection system increases the detection capability of SEMs during...

77

Scanning probe microscopy in the superconductor industry  

SciTech Connect

High-temperature superconductivity and scanning probe microscopy (SPM) have much in common. Both revolutionized their scientific fields and earned Nobel prizes for the original researchers. Both represent small-scale table-top research. Finally, both have emerged from research laboratories into growing industries. Applications of scanning probe microscopy to the superconductor industry range from the straightforward to the exotic. The superior three-dimensional resolution of scanning probe microscopes makes them ideal for routine topographic imaging and profilometry of substrates and thin films. On the other hand, the more esoteric applications of SPM include spectroscopic investigations of various electromagnetic properties of superconductors above and below the critical temperature.

Howland, R.S.; Kirk, M.D. (Park Scientific Instruments (US))

1991-01-01T23:59:59.000Z

78

2011 Annual Meeting Abstacts  

Science Conference Proceedings (OSTI)

Abstracts from Analytical presented at the 102nd AOCS Annual Meeting. 2011 Annual Meeting Abstacts Analytical Chemistry acid analysis Analytical Chemistry aocs applicants april articles atomic)FluorometryDifferential scanning calorimetry chemist chemistr

79

2012 Annual Meeting Abstacts  

Science Conference Proceedings (OSTI)

Abstracts from The Forum presented at the 103rd AOCS Annual Meeting. 2012 Annual Meeting Abstacts Analytical Chemistry acid analysis Analytical Chemistry aocs applicants april articles atomic)FluorometryDifferential scanning calorimetry chemist chemistry

80

Technical Resources  

Science Conference Proceedings (OSTI)

AOCS Resource Directory helps members maintain technical excellence in their professions. Technical Resources Analytical Chemistry acid analysis Analytical Chemistry aocs applicants april articles atomic)FluorometryDifferential scanning calorimetry chemi

Note: This page contains sample records for the topic "differential scanning calorimetry" 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

2010 Annual Meeting Abstacts  

Science Conference Proceedings (OSTI)

Abstracts from Analytical presented at the 101st AOCS Annual Meeting. 2010 Annual Meeting Abstacts Analytical Chemistry acid analysis Analytical Chemistry aocs applicants april articles atomic)FluorometryDifferential scanning calorimetry chemist chemistr

82

The Inter-Agency Meeting (IAM) Membership  

Science Conference Proceedings (OSTI)

Members of the Inter-Agency Meeting, or organisations which contribute. The Inter-Agency Meeting (IAM) Membership Analytical Chemistry acid analysis Analytical Chemistry aocs applicants april articles atomic)FluorometryDifferential scanning calorimetry c

83

2013 Annual Meeting Abstacts Listing  

Science Conference Proceedings (OSTI)

Abstracts from Analytical presented at the 104th AOCS Annual Meeting. 2013 Annual Meeting Abstacts Listing Analytical Chemistry acid analysis Analytical Chemistry aocs applicants april articles atomic)FluorometryDifferential scanning calorimetry chemist

84

2008 Annual Meeting Abstacts  

Science Conference Proceedings (OSTI)

Abstracts from Analytical presented at the 99th AOCS Annual Meeting. 2008 Annual Meeting Abstacts Analytical Chemistry acid analysis Analytical Chemistry aocs applicants april articles atomic)FluorometryDifferential scanning calorimetry chemist chemistry

85

2013 Annual Meeting Abstacts  

Science Conference Proceedings (OSTI)

Abstracts from Analytical presented at the 104th AOCS Annual Meeting. 2013 Annual Meeting Abstacts Analytical Chemistry acid analysis Analytical Chemistry aocs applicants april articles atomic)FluorometryDifferential scanning calorimetry chemist chemistr

86

Document (0k)  

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

Z. Weber. "Pseudo-isothermal ice-crystallization kinetics in the gas-diffusion layer of a fuel cell from differential scanning calorimetry." International Journal of Heat and Mass...

87

Methods Development  

Science Conference Proceedings (OSTI)

ISO committee and more information on standardization effects pertaining to AOCS. Methods Development Analytical Chemistry acid analysis Analytical Chemistry aocs applicants april articles atomic)FluorometryDifferential scanning calorimetry chemist chemi

88

2009 Annual Meeting Abstacts  

Science Conference Proceedings (OSTI)

Abstracts from Analytical presented at the 100th AOCS Annual Meeting. 2009 Annual Meeting Abstacts Analytical Chemistry acid analysis Analytical Chemistry aocs applicants april articles atomic)FluorometryDifferential scanning calorimetry chemist chemistr

89

2012 Annual Meeting Abstacts  

Science Conference Proceedings (OSTI)

Abstracts from Analytical presented at the 103rd AOCS Annual Meeting. 2012 Annual Meeting Abstacts Analytical Chemistry acid analysis Analytical Chemistry aocs applicants april articles atomic)FluorometryDifferential scanning calorimetry chemist chemistr

90

Analytical Division Seed Oil Translation Table  

Science Conference Proceedings (OSTI)

seed oil translation table nomencalture Analytical Division Seed Oil Translation Table Analytical Chemistry Analytical Chemistry aocs articles atomic)FluorometryDifferential scanning calorimetry chemistry Chromatography (liquid detergents esters fats fo

91

Laser Scanning Two Photon and Confocal Microscope  

Science Conference Proceedings (OSTI)

... The SP5 is a laser scanning two-photon and confocal microscope equipped with ... nm HeNe, and tunable IR (680 nm - 1060 nm) lasers * 4 internal ...

2012-10-01T23:59:59.000Z

92

Scanning Transmission Electron Microscopy Investigations of Complex...  

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

Scanning Transmission Electron Microscopy Investigations of Complex Oxides Monday, May 23, 2011 - 3:30pm SSRL Conference room 137-322 Professor Tom Vogt, NanoCenter & Department of...

93

Frequency Scanned Interferometry for ILC Tracker Alignment  

E-Print Network (OSTI)

In this paper, we report high-precision absolute distance and vibration measurements performed with frequency scanned interferometry. Absolute distance was determined by counting the interference fringes produced while scanning the laser frequency. High-finesse Fabry-Perot interferometers were used to determine frequency changes during scanning. A dual-laser scanning technique was used to cancel drift errors to improve the absolute distance measurement precision. A new dual-channel FSI demonstration system is also presented which is an interim stage toward practical application of multi-channel distance measurement. Under realistic conditions, a precision of 0.3 microns was achieved for an absolute distance of 0.57 meters. A possible optical alignment system for a silicon tracker is also presented.

Hai-Jun Yang; Tianxiang Chen; Keith Riles

2011-09-12T23:59:59.000Z

94

4.1 Search and Scan Facility  

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

2 Tuning of the Up: 4. Special Features Previous: 4. Special Features Contents 4.1 Search and Scan Facility The level-of-detail support provided in SLOG-2 and Jumpshot-4's timeline...

95

Transmission Electron Microscope and Scanning Electron Microscopes -  

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

Facilities > Transmission Electron Facilities > Transmission Electron Microscope and Scanning Electron Microscopes FACILITIES Transmission Electron Microscope and Scanning Electron Microscopes Overview Other Facilities Work with Argonne Contact us For Employees Site Map Help Join us on Facebook Follow us on Twitter NE on Flickr Transmission Electron Microscope and Scanning Electron Microscopes The research activities of the Corrosion and Mechanics of Materials Section are supported by complete metallography/sample preparation rooms equipped with several optical and electron microscopes: a Transmission Electron Microscope and two Scanning Electron Microscopes. Bookmark and Share Transmission electron microscope (TEM) Detail of JEOL 100CXII TEM Figure 1: Detail of JEOL 100CXII TEM. Click on image to view larger image.

96

The FTS scans that made up the  

E-Print Network (OSTI)

Kitt Peak Solar Flux Atlas by Kurucz, Furenlid, Brault, and Testerman 1984 have been re-reduced. The scans listed in Table 1 ( = Figure 0) were smoothed with a 3-point Gaussian to simplify continuum placement and matching overlapping scans. An approximate atmospheric model was determined for each FTS scan. Large-scale features produced by O3 and O2 dimer were computed and divided out. The telluric line spectrum was computed using HITRAN and other line data for H2O, O2, and CO2. The line parameters were adjusted for an approximate match to the observed spectra. The wavelength scale for the scans was redetermined. The solar continuum level was found by fitting a smooth curve to high points in the observed spectrum while comparing with the product of the computed solar spectrum times the computed telluric spectrum. The spectrum was normalized to the fitted continuum to produce a residual flux spectrum for each FTS scan. Those scans were divided by the computed telluric spectra to produce residual irradiance spectra. Artifacts from wavelength mismatches, deep lines, etc, were removed by hand and replaced by

Robert L. Kurucz

2005-01-01T23:59:59.000Z

97

Calorimetry Triggering in ATLAS  

Science Conference Proceedings (OSTI)

The ATLAS experiment is preparing for data taking at 14 TeV collision energy. A rich discovery physics program is being prepared in addition to the detailed study of Standard Model processes which will be produced in abundance. The ATLAS multi-level trigger system is designed to accept one event in 2/10{sup 5} to enable the selection of rare and unusual physics events. The ATLAS calorimeter system is a precise instrument, which includes liquid Argon electro-magnetic and hadronic components as well as a scintillator-tile hadronic calorimeter. All these components are used in the various levels of the trigger system. A wide physics coverage is ensured by inclusively selecting events with candidate electrons, photons, taus, jets or those with large missing transverse energy. The commissioning of the trigger system is being performed with cosmic ray events and by replaying simulated Monte Carlo events through the trigger and data acquisition system.

Igonkina, O.; /NIKHEF, Amsterdam; Achenbach, R.; /Kirchhoff Inst. Phys.; Adragna, P.; /Queen Mary, U. of London; Aharrouche, M.; /Mainz U., Inst. Phys.; Alexandre, G.; /Geneva U.; Andrei, V.; /Kirchhoff Inst. Phys.; Anduaga, X.; /La Plata U.; Aracena, I.; /SLAC; Backlund, S.; /CERN; Baines, J.; /Rutherford; Barnett, B.M.; /Rutherford; Bauss, B.; /Mainz U., Inst. Phys.; Bee, C.; /Marseille, CPPM; Behera, P.; /Iowa State U.; Bell, P.; /Manchester U.; Bendel, M.; /Mainz U., Inst. Phys.; Benslama, K.; /Regina U.; Berry, T.; /Royal Holloway, U. of London; Bogaerts, A.; /CERN; Bohm, C.; /Stockholm U.; Bold, T.; /UC, Irvine /AGH-UST, Cracow /Birmingham U. /Barcelona, IFAE /CERN /Birmingham U. /Rutherford /Montreal U. /Santa Maria U., Valparaiso /DESY /DESY, Zeuthen /Geneva U. /City Coll., N.Y. /Barcelona, IFAE /CERN /Birmingham U. /Kirchhoff Inst. Phys. /Birmingham U. /Lisbon, LIFEP /Rio de Janeiro Federal U. /City Coll., N.Y. /Birmingham U. /Copenhagen U. /Copenhagen U. /Brookhaven /Rutherford /Royal Holloway, U. of London /Pennsylvania U. /Montreal U. /SLAC /CERN /Michigan State U. /Chile U., Catolica /City Coll., N.Y. /Oxford U. /La Plata U. /McGill U. /Mainz U., Inst. Phys. /Hamburg U. /DESY /DESY, Zeuthen /Geneva U. /Queen Mary, U. of London /CERN /Rutherford /Rio de Janeiro Federal U. /Birmingham U. /Montreal U. /CERN /Kirchhoff Inst. Phys. /Liverpool U. /Royal Holloway, U. of London /Pennsylvania U. /Kirchhoff Inst. Phys. /Geneva U. /Birmingham U. /NIKHEF, Amsterdam /Rutherford /Royal Holloway, U. of London /Rutherford /Royal Holloway, U. of London /AGH-UST, Cracow /Mainz U., Inst. Phys. /Mainz U., Inst. Phys. /Birmingham U. /Hamburg U. /DESY /DESY, Zeuthen /Geneva U. /Kirchhoff Inst. Phys. /Michigan State U. /Stockholm U. /Stockholm U. /Birmingham U. /CERN /Montreal U. /Stockholm U. /Arizona U. /Regina U. /Regina U. /Rutherford /NIKHEF, Amsterdam /Kirchhoff Inst. Phys. /DESY /DESY, Zeuthen /City Coll., N.Y. /University Coll. London /Humboldt U., Berlin /Queen Mary, U. of London /Argonne /LPSC, Grenoble /Arizona U. /Kirchhoff Inst. Phys. /Birmingham U. /Antonio Narino U. /Hamburg U. /DESY /DESY, Zeuthen /Kirchhoff Inst. Phys. /Birmingham U. /Chile U., Catolica /Indiana U. /Manchester U. /Kirchhoff Inst. Phys. /Rutherford /City Coll., N.Y. /Stockholm U. /La Plata U. /Antonio Narino U. /Queen Mary, U. of London /Kirchhoff Inst. Phys. /Antonio Narino U. /Pavia U. /City Coll., N.Y. /Mainz U., Inst. Phys. /Mainz U., Inst. Phys. /Pennsylvania U. /Barcelona, IFAE /Barcelona, IFAE /Chile U., Catolica /Genoa U. /INFN, Genoa /Rutherford /Barcelona, IFAE /Nevis Labs, Columbia U. /CERN /Antonio Narino U. /McGill U. /Rutherford /Santa Maria U., Valparaiso /Rutherford /Chile U., Catolica /Brookhaven /Oregon U. /Mainz U., Inst. Phys. /Barcelona, IFAE /McGill U. /Antonio Narino U. /Antonio Narino U. /Kirchhoff Inst. Phys. /Sydney U. /Rutherford /McGill U. /McGill U. /Pavia U. /Genoa U. /INFN, Genoa /Kirchhoff Inst. Phys. /Kirchhoff Inst. Phys. /Mainz U., Inst. Phys. /Barcelona, IFAE /SLAC /Stockholm U. /Moscow State U. /Stockholm U. /Birmingham U. /Kirchhoff Inst. Phys. /DESY /DESY, Zeuthen /Birmingham U. /Geneva U. /Oregon U. /Barcelona, IFAE /University Coll. London /Royal Holloway, U. of London /Birmingham U. /Mainz U., Inst. Phys. /Birmingham U. /Birmingham U. /Oregon U. /La Plata U. /Geneva U. /Chile U., Catolica /McGill U. /Pavia U. /Barcelona, IFAE /Regina U. /Birmingham U. /Birmingham U. /Kirchhoff Inst. Phys. /Oxford U. /CERN /Kirchhoff Inst. Phys. /UC, Irvine /UC, Irvine /Wisconsin U., Madison /Rutherford /Mainz U., Inst. Phys. /CERN /Geneva U. /Copenhagen U. /City Coll., N.Y. /Wisconsin U., Madison /Rio de Janeiro Federal U. /Wisconsin U., Madison /Stockholm U. /University Coll. London

2011-12-08T23:59:59.000Z

98

Other Differentials are Similar  

Gasoline and Diesel Fuel Update (EIA)

York and Philadelphia. As you can see, the gasoline price differentials between these cities are often more than 10 cents per gallon, and occasionally exceed 15 cents, although...

99

H2Scan LLC | Open Energy Information  

Open Energy Info (EERE)

H2Scan LLC H2Scan LLC Jump to: navigation, search Name H2Scan LLC Place Valencia, California Zip 91355 Sector Hydro, Hydrogen Product Hydrogen specific sensing systems, uniquely able to detect hydrogen against virtually any background gases. Coordinates 39.468791°, -0.376913° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":39.468791,"lon":-0.376913,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

100

WorldScan | Open Energy Information  

Open Energy Info (EERE)

WorldScan WorldScan Jump to: navigation, search LEDSGP green logo.png FIND MORE DIA TOOLS This tool is part of the Development Impacts Assessment (DIA) Toolkit from the LEDS Global Partnership. Tool Summary LAUNCH TOOL Name: WorldScan Agency/Company /Organization: Netherlands Bureau for Economic Policy Analysis (CPB) Sector: Climate, Energy Complexity/Ease of Use: Moderate Website: www.gtap.agecon.purdue.edu/resources/res_display.asp?RecordID=1923 Related Tools Marginal Abatement Cost Tool (MACTool) Greenhouse Gas and Air Pollution Interactions and Synergies (GAINS) Gold Standard Program Model ... further results A recursively dynamic general equilibrium model for the world economy, developed for the analysis of long-term issues in international economics; used both as a tool to construct long-term scenarios and as an instrument

Note: This page contains sample records for the topic "differential scanning calorimetry" 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

Scanning and storage of electrophoretic records  

SciTech Connect

An electrophoretic record that includes at least one gel separation is mounted for motion laterally of the separation record. A light source is positioned to illuminate at least a portion of the record, and a linear array camera is positioned to have a field of view of the illuminated portion of the record and orthogonal to the direction of record motion. The elements of the linear array are scanned at increments of motion of the record across the field of view to develop a series of signals corresponding to intensity of light at each element at each scan increment.

McKean, Ronald A. (Royal Oak, MI); Stiegman, Jeff (Ann Arbor, MI)

1990-01-01T23:59:59.000Z

102

Scanning and Mapping Strategies for CMB Experiments  

E-Print Network (OSTI)

CMB anisotropy experiments seeking to make maps with more pixels than the 6144 pixels used by the COBE DMR need to address the practical issues of the computer time and storage required to make maps. A simple, repetitive scan pattern reduces these requirements but leaves the experiment vulnerable to systematic errors and striping in the maps. In this paper I give a time-ordered method for map-making with one-horned experiments that has reasonable memory and CPU needs but can handle complex COBE-like scans paths and 1/f noise.

Edward L. Wright

1996-11-29T23:59:59.000Z

103

Scanned_Joint_Declaration_(Italian).pdf | Department of Energy  

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

JointDeclaration(Italian).pdf ScannedJointDeclaration(Italian).pdf ScannedJointDeclaration(Italian).pdf More Documents & Publications FTCP Face to Face Meeting - March 30,...

104

Scanning the Technology Energy Infrastructure Defense Systems  

E-Print Network (OSTI)

of their own telecommunications systems, which often consist of backbone fiber-optic or microwave connectingScanning the Technology Energy Infrastructure Defense Systems MASSOUD AMIN, SENIOR MEMBER, IEEE systems and to develop de- fense plans to protect the network against extreme contingencies caused

Amin, S. Massoud

105

PNNL SA 95506 Scan to learn more  

E-Print Network (OSTI)

PNNL SA 95506 Scan to learn more www.pnnl.gov At Pacific Northwest National Laboratory, we are transforming the world through courageous discovery and innovation. The evidence is all around us. PNNL called PNNL) developed the standards and devices for setting and measuring radiation doses received

106

Oxide Melt Solution Calorimetry of Fe2+ -bearing Oxides and Application to the Magnetite - Maghemite (Fe3O4-Fe8/3O4) system  

Science Conference Proceedings (OSTI)

A consistent methodology for obtaining enthalpy of formation of Fe{sup 2+}-containing binary and multicomponent oxides using high temperature oxide melt solution calorimetry has been developed. The enthalpies of wuestite (FeO) and magnetite (Fe{sub 3}O{sub 4}) oxidation to hematite (Fe{sub 2}O{sub 3}) were measured using oxidative drop solution calorimetry in which the final product is dissolved ferric oxide. Two methods were applied: drop solution calorimetry at 1073 K in lead borate solvent and at 973 K in sodium molybdate, each under both oxygen flowing over and bubbling through the solvent, giving consistent results in agreement with literature values. The enthalpies of formation of all three iron oxides from the elements were obtained using a thermodynamic cycle involving the directly measured oxidative dissolution enthalpy of iron metal in sodium molybdate at 973 K and gave excellent consistency with literature data. The methodology was then applied to the magnetite - maghemite system. The enthalpy of mixing of the Fe{sub 3}O{sub 4}-Fe{sub 8/3}O{sub 4} spinel solid solution is exothermic and, 2 represented by a subregular (Margules) formalism, {Delta}H{sub mix} = x(1-x)(-63.36 {+-} 8.60(1-x) + 17.65 {+-} 6.40x) kJ/mol, where x is the mole fraction of magnetite. The entropies of mixing of the solid solution were calculated for different assumptions about the distribution of cations, charges, and vacancies in these defect spinels. The different models lead to only small differences in the entropy of mixing. Calculated free energies of mixing show no evidence for a solvus in the magnetite - maghemite system.

Lilova, Kristina I.; Xu, Fen; Rosso, Kevin M.; Pearce, Carolyn I.; Kamali, Saeed; Navrotsky, Alexandra

2012-01-01T23:59:59.000Z

107

Monitoring the kinetics and thermodynamics of interfacial enzymatic catalysis by differential scanning calorimetryq  

E-Print Network (OSTI)

DPPC by molecular dynamics simulation [35]. We propose that the newly formed aggregate at the end of biochemical processes: activa- tion of phospholipase A2, Thermochim. Acta 172 (1990) 1­10. [9] L. Yu, E by the hydrolysis of phospholipase A2 enzyme: a molecular dynamics simulation study, Biophys. J. 80 (2001) 565

Luhua, Lai

108

Interactive visualization for network and port scan detection  

Science Conference Proceedings (OSTI)

Many times, network intrusion attempts begin with either a network scan, where a connection is attempted to every possible destination in a network, or a port scan, where a connection is attempted to each port on a given destination. Being able to detect ... Keywords: information visualization, intrusion detection, network scans, network security, port scans, user interfaces

Chris Muelder; Kwan-Liu Ma; Tony Bartoletti

2005-09-01T23:59:59.000Z

109

Partial Differential Equations  

Science Conference Proceedings (OSTI)

Table 3   Linear partial differential equations...fluids, electromagnetic) Damped waves, transmission lines Elliptic (c) Static case 2 Φ = f ( r ) 4th order (b) Elastic vibrations 4th order (c) Static

110

Differential privacy under fire  

Science Conference Proceedings (OSTI)

Anonymizing private data before release is not enough to reliably protect privacy, as Netflix and AOL have learned to their cost. Recent research on differential privacy opens a way to obtain robust, provable privacy guarantees, and systems like PINQ ...

Andreas Haeberlen; Benjamin C. Pierce; Arjun Narayan

2011-08-01T23:59:59.000Z

111

Rapid Scan AERI Observations: Benefits and Analysis  

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

Rapid Scan AERI Observations: Benefits and Analysis Rapid Scan AERI Observations: Benefits and Analysis W. F. Feltz, D. D. Turner, R. O. Knuteson, and R. G. Dedecker Space Science and Engineering Center Cooperative Institute of Mesoscale Meteorological Studies University of Wisconsin-Madison Madison, Wisconsin D. D. Turner Pacific Northwest National Laboratory Richland, Washington Introduction The U.S. Department of Energy's (DOE's) Atmospheric Radiation Measurement (ARM) Program has funded the development of the atmospheric emitted radiance interferometer (AERI). This has led to a hardened, autonomous system that measures downwelling infrared (IR) radiance at high-spectral resolution. Seven AERI systems have been deployed around the world as part of the ARM Program. The initial goal of these instruments was to characterize the clear-sky IR emission from the atmosphere,

112

High-speed massively parallel scanning  

DOE Patents (OSTI)

A new technique for recording a series of images of a high-speed event (such as, but not limited to: ballistics, explosives, laser induced changes in materials, etc.) is presented. Such technique(s) makes use of a lenslet array to take image picture elements (pixels) and concentrate light from each pixel into a spot that is much smaller than the pixel. This array of spots illuminates a detector region (e.g., film, as one embodiment) which is scanned transverse to the light, creating tracks of exposed regions. Each track is a time history of the light intensity for a single pixel. By appropriately configuring the array of concentrated spots with respect to the scanning direction of the detection material, different tracks fit between pixels and sufficient lengths are possible which can be of interest in several high-speed imaging applications.

Decker, Derek E. (Byron, CA)

2010-07-06T23:59:59.000Z

113

Laser scanning system for object monitoring  

DOE Patents (OSTI)

A laser scanner is located in a fixed position to have line-of-sight access to key features of monitored objects. The scanner rapidly scans pre-programmed points corresponding to the positions of retroreflecting targets affixed to the key features of the objects. The scanner is capable of making highly detailed scans of any portion of the field of view, permitting the exact location and identity of targets to be confirmed. The security of an object is verified by determining that the cooperative target is still present and that its position has not changed. The retroreflecting targets also modulate the reflected light for purposes of returning additional information back to the location of the scanner.

McIntyre, Timothy James [Knoxville, TN; Maxey, Lonnie Curtis [Powell, TN; Chiaro, Jr; John, Peter [Clinton, TN

2008-04-22T23:59:59.000Z

114

Circular zig-zag scan video format  

DOE Patents (OSTI)

A circular, ziz-zag scan for use with vidicon tubes. A sine wave is generated, rectified and its fourth root extracted. The fourth root, and its inverse, are used to generate horizontal ramp and sync signals. The fourth root is also used to generate a vertical sync signal, and the vertical sync signal, along with the horizontal sync signal, are used to generate the vertical ramp signal. Cathode blanking and preamplifier clamp signals are also obtained from the vertical sync signal.

Peterson, C. Glen (Los Alamos, NM); Simmons, Charles M. (Los Alamos, NM)

1992-01-01T23:59:59.000Z

115

New Approaches to Differential Mobility Analysis for Airborne Measurements  

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

to Differential Mobility to Differential Mobility Analysis for Airborne Measurements Rick Flagan Chemical Engineering and Environmental Science and Engineering California Institute of Technology Pasadena, CA 91125 Support: NSF, ONR, Davidow Foundation Differential Mobility Analysis Air Sample Aerosol Charger/Neutralizer (Atmospheric Pressure Chemical Ionization) Sheath Air Q sh ~ 10 Q a Volumetric flow rate Q s Exhaust Q ex =Q sh Differential Mobility Analyzer DMA (Aerodynamic Analog of Sector Mass Spectrometer) E F e =eE F drag = 6πµR p V C slip (λ /R p ) CPC Q a =Q s Steady or Scanned Voltage Migration Velocity * Mobility * Peclet number for migration v E = Z p E Z p = n p e k B T D Pe mig = electrophoretic migration diffusive transport = bv E D = bn p eE k B T Singly Charged Particles  Radial DMA  Cylindrical DMA E = V b Pe = eV k B T E =

116

Scanning magnetoresistance microscopy of atom chips  

Science Conference Proceedings (OSTI)

Surface based geometries of microfabricated wires or patterned magnetic films can be used to magnetically trap and manipulate ultracold neutral atoms or Bose-Einstein condensates. We investigate the magnetic properties of such atom chips using a scanning magnetoresistive (MR) microscope with high spatial resolution and high field sensitivity. By comparing MR scans of a permanent magnetic atom chip to field profiles obtained using ultracold atoms, we show that MR sensors are ideally suited to observe small variations of the magnetic field caused by imperfections in the wires or magnetic materials which ultimately lead to fragmentation of ultracold atom clouds. Measurements are also provided for the magnetic field produced by a thin current-carrying wire with small geometric modulations along the edge. Comparisons of our measurements with a full numeric calculation of the current flow in the wire and the subsequent magnetic field show excellent agreement. Our results highlight the use of scanning MR microscopy as a convenient and powerful technique for precisely characterizing the magnetic fields produced near the surface of atom chips.

Volk, M.; Whitlock, S.; Wolff, C. H.; Hall, B. V.; Sidorov, A. I. [ARC Centre of Excellence for Quantum-Atom Optics and Centre for Atom Optics and Ultrafast Spectroscopy, Swinburne University of Technology, Hawthorn, Victoria 3122 (Australia)

2008-02-15T23:59:59.000Z

117

Circular zig-zag scan video format  

DOE Patents (OSTI)

This invention is comprised of a circular, zig-zag scan for use with vidicon tubes. A sine wave is generated, rectified and its fourth root extracted. The fourth root, and its inverse, are used to generate horizontal ramp and sync signals. The fourth root is also used to generate a vertical sync signal, and the vertical sync signal, along with the horizontal sync signal, are used to generate the vertical ramp signal. Cathode blanking and preamplifier clamp signals are also obtained from the vertical sync signal.

Peterson, C.G.; Simmons, C.M.

1991-03-21T23:59:59.000Z

118

Circular zig-zag scan video format  

DOE Patents (OSTI)

A circular, ziz-zag scan for use with vidicon tubes is disclosed. A sine wave is generated, rectified and its fourth root extracted. The fourth root, and its inverse, are used to generate horizontal ramp and sync signals. The fourth root is also used to generate a vertical sync signal, and the vertical sync signal, along with the horizontal sync signal, are used to generate the vertical ramp signal. Cathode blanking and preamplifier clamp signals are also obtained from the vertical sync signal. 10 figs.

Peterson, C.G.; Simmons, C.M.

1992-06-09T23:59:59.000Z

119

Atmospheric pressure scanning transmission electron microscopy  

SciTech Connect

Scanning transmission electron microscope (STEM) images of gold nanoparticles (2.1 nm average diameter) at atmospheric pressure have been recorded through a 0.36 mm thick mixture of CO, O2 and He. This was accomplished using a reaction cell consisting of two electron-transparent silicon nitride membranes mounted on a specially designed specimen rod. Gas flow occurred through plastic tubing from the outside of the microscope to the specimen region and back. Gold nanoparticles of a full width half maximum diameter of 1.0 nm were visible above the background noise and the achieved resolution was 0.5 nm in accordance with calculations of the beam broadening.

De Jonge, Niels [ORNL; Veith, Gabriel M [ORNL; Bigelow, Wilbur C [ORNL

2010-01-01T23:59:59.000Z

120

When Discrete Meets Differential  

Science Conference Proceedings (OSTI)

We provide a theoretical proof showing that under a proportional noise model, the discrete eight point algorithm behaves similarly to the differential eight point algorithm when the motion is small. This implies that the discrete algorithm can handle ... Keywords: Perturbation analysis, Structure from motion

Wen-Yan Lin; Geok-Choo Tan; Loong-Fah Cheong

2010-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "differential scanning calorimetry" 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

A System Level Boundary Scan Controller Board for VME Applications  

Science Conference Proceedings (OSTI)

In this article an application of boundary scan test at system level is analyzed. The objective is met through the description of the design and implementation options of a VME boundary scan controller board prototype and the corresponding software. ... Keywords: ATPG, IEEE 1149.1 boundary scan test, board level test and system level test

Nuno Cardoso; Carlos Beltrán Almeida; José Carlos Da Silva

2001-06-01T23:59:59.000Z

122

Copy of Bound Original For Scanning  

Office of Legacy Management (LM)

Copy of Bound Original Copy of Bound Original For Scanning Document # 1\1\ i g -b DOE/El/-0005/6 Formerly Utilized IVIEWAEC Site! Remedial Action Progrhn, F@diilogical Survey of the Seaway Industrial Par Tonawanda, New Yor May 197 Final Repel Prepared f U.S. Department of Enerc Assistant Secretary for Environme Division of Environmental Control Technolo Washington, D.C. 205, uric Contract No. W-7405-ENG- - - - Available from: ' : -. National Technical Information Service (NTIS) U.S. Department of Comnerce 5285 Port Royal Road Springfield, Virginia 22161 price: Printed Copy: $ 5.25 Microffche: $ 3.00 PREFACE This series of reports results from a program initiated in 1974 by the Atomic Energy Commission (AEC) for determination of the condition of sites formerly utilized by the Manhattan Engineering District &ED)

123

Results from STAR Beam Energy Scan Program  

E-Print Network (OSTI)

Results from the Beam Energy Scan (BES) program conducted recently by STAR experiment at RHIC are presented. The data from Phase-I of the BES program collected in Au+Au collisions at center-of-mass energies (\\sqrt{s_{NN}}) of 7.7, 11.5, 19.6, 27, and 39 GeV cover a wide range of baryon chemical potential ?\\mu_B (100-400 MeV) in the QCD phase diagram. Several STAR results from the BES Phase-I related to "turn-o?ff" of strongly inter- acting quark-gluon plasma (sQGP) signatures and signals of QCD phase boundary are reported. In addition to this, an outlook is presented for the future BES Phase-II program and a possible ?fixed target program at STAR.

Michal Sumbera

2013-01-30T23:59:59.000Z

124

Rapid scanning system for fuel drawers  

DOE Patents (OSTI)

A nondestructive method for uniqely distinguishing among and quantifying the mass of individual fuel plates in situ in fuel drawers utilized in nuclear reactors is described. The method is both rapid and passive, eliminating the personnel hazard of the commonly used irradiation techniques which require that the analysis be performed in proximity to an intense neutron source such as a reactor. In the present technique, only normally decaying nuclei are observed. This allows the analysis to be performed anywhere. This feature, combined with rapid scanning of a given fuel drawer (in approximately 30 s), and the computer data analysis allows the processing of large numbers of fuel drawers efficiently in the event of a loss alert.

Caldwell, John T. (Los Alamos, NM); Fehlau, Paul E. (Los Alamos, NM); France, Stephen W. (Los Alamos, NM)

1981-01-01T23:59:59.000Z

125

Systematic Sampling of Scanning Lidar Swaths  

E-Print Network (OSTI)

Proof of concept lidar research has, to date, examined wall-to-wall models of forest ecosystems. While these studies have been important for verifying lidars efficacy for forest surveys, complete coverage is likely not the most cost effective means of using lidar as auxiliary data for operational surveys; sampling of some sort being the better alternative. This study examines the effectiveness of sampling with high point-density scanning lidar data and shows that systematic sampling is a better alternative to simple random sampling. It examines the bias and mean squared error of various estimators, and concludes that a linear-trend-based and especially an autocorrelation-assisted variance estimator perform better than the commonly used simple random sampling based-estimator when sampling is systematic.

Marcell, Wesley Tyler

2009-12-01T23:59:59.000Z

126

Differential auger spectrometry  

DOE Patents (OSTI)

Differential Auger spectroscopy method for increasing the sensitivity of micro-Auger spectroanalysis of the surfaces of dilute alloys, by alternately periodically switching an electron beam back and forth between an impurity free reference sample and a test sample containing a trace impurity. The Auger electrons from the samples produce representative Auger spectrum signals which cancel to produce an Auger test sample signal corresponding to the amount of the impurity in the test samples.

Strongin, Myron (Center Moriches, NY); Varma, Matesh Narayan (Shirley, NY); Anne, Joshi (St. Louis Park, MN)

1976-06-22T23:59:59.000Z

127

SIMULTANEOUS DIFFERENTIAL EQUATION COMPUTER  

DOE Patents (OSTI)

A description is given for an electronic simulator for a system of simultaneous differential equations, including nonlinear equations. As a specific example, a homogeneous nuclear reactor system including a reactor fluid, heat exchanger, and a steam boiler may be simulated, with the nonlinearity resulting from a consideration of temperature effects taken into account. The simulator includes three operational amplifiers, a multiplier, appropriate potential sources, and interconnecting R-C networks.

Collier, D.M.; Meeks, L.A.; Palmer, J.P.

1960-05-10T23:59:59.000Z

128

Temperature differential detection device  

DOE Patents (OSTI)

A temperature differential detection device for detecting the temperature differential between predetermined portions of a container wall is disclosed as comprising a Wheatstone bridge circuit for detecting resistance imbalance with a first circuit branch having a first elongated wire element mounted in thermal contact with a predetermined portion of the container wall, a second circuit branch having a second elongated wire element mounted in thermal contact with a second predetermined portion of a container wall with the wire elements having a predetermined temperature-resistant coefficient, an indicator interconnected between the first and second branches remote from the container wall for detecting and indicating resistance imbalance between the first and second wire elements, and connector leads for electrically connecting the wire elements to the remote indicator in order to maintain the respective resistance value relationship between the first and second wire elements. The indicator is calibrated to indicate the detected resistance imbalance in terms of a temperature differential between the first and second wall portions.

Girling, Peter M. (Allentown, PA)

1986-01-01T23:59:59.000Z

129

Temperature differential detection device  

DOE Patents (OSTI)

A temperature differential detection device for detecting the temperature differential between predetermined portions of a container wall is disclosed as comprising a Wheatstone bridge circuit for detecting resistance imbalance with a first circuit branch having a first elongated wire element mounted in thermal contact with a predetermined portion of the container wall, a second circuit branch having a second elongated wire element mounted in thermal contact with a second predetermined portion of a container wall with the wire elements having a predetermined temperature-resistant coefficient, an indicator interconnected between the first and second branches remote from the container wall for detecting and indicating resistance imbalance between the first and second wire elements, and connector leads for electrically connecting the wire elements to the remote indicator in order to maintain the respective resistance value relationship between the first and second wire elements. The indicator is calibrated to indicate the detected resistance imbalance in terms of a temperature differential between the first and second wall portions. 2 figs.

Girling, P.M.

1986-04-22T23:59:59.000Z

130

Lansce Wire Scanning Diagnostics Device Mechanical Design  

SciTech Connect

The Accelerator Operations & Technology Division at Los Alamos National Laboratory operates a linear particle accelerator which utilizes 110 wire scanning diagnostics devices to gain position and intensity information of the proton beam. In the upcoming LANSCE improvements, 51 of these wire scanners are to be replaced with a new design, up-to-date technology and off-the-shelf components. This document outlines the requirements for the mechanical design of the LANSCE wire scanner and presents the recently developed linac wire scanner prototype. Additionally, this document presents the design modifications that have been implemented into the fabrication and assembly of this first linac wire scanner prototype. Also, this document will present the design for the second, third, and fourth wire scanner prototypes being developed. Prototypes 2 and 3 belong to a different section of the particle accelerator and therefore have slightly different design specifications. Prototype 4 is a modification of a previously used wire scanner in our facility. Lastly, the paper concludes with a plan for future work on the wire scanner development.

Rodriguez Esparza, Sergio [Los Alamos National Laboratory; Batygin, Yuri K. [Los Alamos National Laboratory; Gilpatrick, John D. [Los Alamos National Laboratory; Gruchalla, Michael E. [Los Alamos National Laboratory; Maestas, Alfred J. [Los Alamos National Laboratory; Pillai, Chandra [Los Alamos National Laboratory; Raybun, Joseph L. [Los Alamos National Laboratory; Sattler, F. D. [Los Alamos National Laboratory; Sedillo, James Daniel [Los Alamos National Laboratory; Smith, Brian G. [Los Alamos National Laboratory

2011-01-01T23:59:59.000Z

131

Positron Emission Tomography (PET) and Positron Scanning  

Office of Scientific and Technical Information (OSTI)

DOE R&D Accomplishments DOE R&D Accomplishments Search All Database Web Pages for Go The Basics Home About What's New FAQ Contact Us Laureates Nobel Laureates Fermi Laureates Nobel Physicists Nobel Chemists Medicine Nobels Explore Insights SC Stories Snapshots R&D Nuggets Database Search Browse Reports Database Help Finding Aids Site Map A - Z Index Menu Synopsis Blog Archive QR Code RSS Archive Tag Cloud Videos Widget XML Bookmark and Share Positron Emission Tomography (PET) and Positron Scanning Resources with Additional Information Positron Emission Tomography (PET) Scanner Courtesy Lawrence Berkeley National Laboratory 'Positron Emission Tomography ... [is a medical imaging technique that] can track chemical reactions in living tissues and merges chemistry with biological imaging. Its strength has been in studies of the brain where there has been significant progress in investigations of drug addiction, aging, mental illness, and neurogenic disorders. Positron Emission Tomography (PET) had its genesis in hot-atom chemical research supported by the Chemical Sciences Division of the Office of Basic Energy Sciences. Through this research it was learned, over many years, how to prepare short-lived positron emitters such as 18F whose half-life is 110 minutes. In 1975, the molecule [18F]fluorodeoxyglucose was successfully synthesized at Brookhaven National Laboratory (BNL) and set the stage for Positron Emission Tomography of the human brain.'

132

DIFFERENTIAL FAULT SENSING CIRCUIT  

DOE Patents (OSTI)

A differential fault sensing circuit is designed for detecting arcing in high-voltage vacuum tubes arranged in parallel. A circuit is provided which senses differences in voltages appearing between corresponding elements likely to fault. Sensitivity of the circuit is adjusted to some level above which arcing will cause detectable differences in voltage. For particular corresponding elements, a group of pulse transformers are connected in parallel with diodes connected across the secondaries thereof so that only voltage excursions are transmitted to a thyratron which is biased to the sensitivity level mentioned.

Roberts, J.H.

1961-09-01T23:59:59.000Z

133

V-119: IBM Security AppScan Enterprise Multiple Vulnerabilities |  

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

9: IBM Security AppScan Enterprise Multiple Vulnerabilities 9: IBM Security AppScan Enterprise Multiple Vulnerabilities V-119: IBM Security AppScan Enterprise Multiple Vulnerabilities March 26, 2013 - 12:56am Addthis PROBLEM: IBM Security AppScan Enterprise Multiple Vulnerabilities PLATFORM: IBM Rational AppScan 5.x IBM Rational AppScan 8.x ABSTRACT: IBM has acknowledged multiple vulnerabilities REFERENCE LINKS: IBM Reference #:1626264 Secunia Advisory SA52764 CVE-2008-4033 CVE-2012-4431 CVE-2012-5081 CVE-2013-0473 CVE-2013-0474 CVE-2013-0510 CVE-2013-0511 CVE-2013-0512 CVE-2013-0513 CVE-2013-0532 IMPACT ASSESSMENT: Medium DISCUSSION: 1) The application allows users to perform certain actions via HTTP requests without performing proper validity checks to verify the requests. This can be exploited to e.g. cause a DoS when a logged-in user visits a

134

Bone scanning in the detection of occult fractures  

SciTech Connect

The potential role of bone scanning in the early detection of occult fractures following acute trauma was investigated. Technetium 99m pyrophosphate bone scans were obtained in patients with major clinical findings and negative or equivocal roentgenograms following trauma. Bone scanning facilitated the prompt diagnosis of occult fractures in the hip, knee, wrist, ribs and costochondral junctions, sternum, vertebrae, sacrum, and coccyx. Several illustrative cases are presented. Roentgenographic confirmation occurred following a delay of days to weeks and, in some instances, the roentgenographic findings were subtle and could be easily overlooked. This study demonstrates bone scanning to be invaluable and definitive in the prompt detection of occult fractures.

Batillas, J.; Vasilas, A.; Pizzi, W.F.; Gokcebay, T.

1981-07-01T23:59:59.000Z

135

Multi-level scanning method for defect inspection  

DOE Patents (OSTI)

A method for performing scanned defect inspection of a collection of contiguous areas using a specified false-alarm-rate and capture-rate within an inspection system that has characteristic seek times between inspection locations. The multi-stage method involves setting an increased false-alarm-rate for a first stage of scanning, wherein subsequent stages of scanning inspect only the detected areas of probable defects at lowered values for the false-alarm-rate. For scanning inspection operations wherein the seek time and area uncertainty is favorable, the method can substantially increase inspection throughput.

Bokor, Jeffrey (Oakland, CA); Jeong, Seongtae (Richmond, CA)

2002-01-01T23:59:59.000Z

136

Iran Thomas Auditorium, 8600 Transport Measurements by Scanning...  

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

8600 Transport Measurements by Scanning Probe Microscopy: Possibilities for Graphene Randall M. Feenstra Department of Physics Carnegie Mellon University CNMS D D I I S S...

137

Scanning Electron Microscope 1: Zeiss Ultra-60 FESEM  

Science Conference Proceedings (OSTI)

Scanning Electron Microscope 1: Zeiss Ultra-60 FESEM. ... Secondary and backscattered electron detectors; Images structures down to 10 nm in size; ...

2013-05-30T23:59:59.000Z

138

Using Scanning Acoustic Microscopy to Study Subsurface Defects ...  

Science Conference Proceedings (OSTI)

... surface (found during periodic inspections during the course of the experiments). ... Scanning—A Review," Proceedings of the IEEE, 67 (8) (August 1979), pp.

139

DIFFERENTIAL PULSE HEIGHT DISCRIMINATOR  

DOE Patents (OSTI)

Pulse-height discriminators are described, specifically a differential pulse-height discriminator which is adapted to respond to pulses of a band of amplitudes, but to reject pulses of amplitudes greater or less than tbe preselected band. In general, the discriminator includes a vacuum tube having a plurality of grids adapted to cut off plate current in the tube upon the application of sufficient negative voltage. One grid is held below cutoff, while a positive pulse proportional to the amplltude of each pulse is applled to this grid. Another grid has a negative pulse proportional to the amplitude of each pulse simultaneously applied to it. With this arrangement the tube will only pass pulses which are of sufficlent amplitude to counter the cutoff bias but not of sufficlent amplitude to cutoff the tube.

Test, L.D.

1958-11-11T23:59:59.000Z

140

Gating internal nodes to reduce power during scan shift  

Science Conference Proceedings (OSTI)

It is a common practice to gate a limited number of scan cells in order to reduce overall switching activity during shift, thereby, reducing the circuit's dynamic power consumption. In this paper, we propose a novel approach to reduce overall shift power ... Keywords: gating internal nodes, low power test, scan shift power reduction

Dheepakkumaran Jayaraman; Rajamani Sethuram; Spyros Tragoudas

2010-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "differential scanning calorimetry" 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

Imaging Small Molecules by Scanning Probe Microscopy Shirley Chiang  

E-Print Network (OSTI)

1 Imaging Small Molecules by Scanning Probe Microscopy Shirley Chiang Department of Physics. Ohtani, R.J. Wilson, S. Chiang, and C.M. Mate, "Scanning Tunneling Microscopy Observations of Benzene. V.M. Hallmark, S. Chiang, J.F. Rabolt, J.D. Swalen, and R.J. Wilson, "Observation of Atomic

Chiang, Shirley

142

Scan Test Response Compaction Combined with Diagnosis Capabilities  

Science Conference Proceedings (OSTI)

As today's process technologies are combined with ever increasing design sizes, the result is a dramatic increase in the number of scan test vectors that must be applied during manufacturing test. The increased chip complexities, in combination with ... Keywords: ATE, ATPG, Design for test, Diagnosis, Scan compression, Yield

Sverre Wichlund; Frank Berntsen; Einar Johan Aas

2008-06-01T23:59:59.000Z

143

Immersive mobile gaming with scanned laser pico projection systems  

Science Conference Proceedings (OSTI)

A scanned laser pico projector's advantages, in the space of motion sensed and/or mobile gaming, is explored in this paper. In order to better appreciate the applications, we first briefly delve into the operation of a MicroVision MEMS-based scanned ...

P. Selvan Viswanathan; David Lashmet; Jari Honkanen

2011-11-01T23:59:59.000Z

144

Iterative solution of differential equations  

E-Print Network (OSTI)

We discuss alternative iteration methods for differential equations. We provide a convergence proof for exactly solvable examples and show more convenient formulas for nontrivial problems.

Paolo Amore; Hakan Ciftci; Francisco M. Fernandez

2006-09-29T23:59:59.000Z

145

Differentiating Lyme Disease from Syphilis  

E-Print Network (OSTI)

Analysis of the humoral response to the flagellin protein of Borrelia burgdorferi: cloning of regions capable of differentiating Lyme disease from syphilis.

J M Robinson; T J Pilot-matias; S D Pratt; C B Patel; T S Bevirt; J C Hunt; J. Clin Microbiol; Terry S. Bevirt; J. C. Hunt

1992-01-01T23:59:59.000Z

146

Induction of DNA Damage by Low Dose PET scans  

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

Induction of DNA Damage by Low Dose PET scans Induction of DNA Damage by Low Dose PET scans Douglas Boreham McMaster University Abstract This research is focused on assessing the radiation risk associated with positron emission tomography (PET) scans. It has been suggested that low dose medical imaging, such as PET scans, carry an added biological risk because they expose the patient to ionizing radiation. PET scanning is an increasingly used nuclear medicine procedure that requires the administration of isotope 18F-fluorodeoxyglucose (18F-FDG, E=250 keV β and 511 keV γ) and results in an effective dose to the patient ranging from 7-22 mSv. The radiation induced DNA damage associated with a PET scan was studied in 7-9 week old female wild type Trp53 +/+ mice. Mice were given a PET scan with 18F-FDG and the biological response was assessed in bone marrow using

147

OBSERVATIONAL SCAN-INDUCED ARTIFICIAL COSMIC MICROWAVE BACKGROUND ANISOTROPY  

SciTech Connect

Reliably detecting the cosmic microwave background (CMB) anisotropy is of great importance in understanding the birth and evolution of the universe. One of the difficulties in CMB experiments is the domination of measured CMB anisotropy maps by the Doppler dipole moment from the motion of the antenna relative to the CMB. For each measured temperature, the expected dipole component has to be calculated separately and then subtracted from the data. A small error in dipole direction, antenna pointing direction, sidelobe pickup contamination, and/or timing synchronism can introduce a significant deviation in the dipole-cleaned CMB temperature. After a full-sky observational scan, the accumulated deviations will be structured with a pattern closely correlated with the observation pattern with artificial anisotropies, including artificial quadrupole, octupole, etc., on large scales in the final CMB map. Such scan-induced anisotropies on large scales can be predicted by the true dipole moment and observational scan scheme. Indeed, the expected scan-induced quadrupole pattern of the Wilkinson Microwave Anisotropy Probe (WMAP) mission is perfectly in agreement with the published WMAP quadrupole. With the scan strategy of the Planck mission, we predict that scan-induced anisotropies will also produce an artificially aligned quadrupole. The scan-induced anisotropy is a common problem for all sweep missions and, like the foreground emissions, has to be removed from observed maps. Without doing so, CMB maps from COBE, WMAP, and Planck are not reliable for studying the CMB anisotropy.

Liu Hao; Li Tipei, E-mail: liuhao@ihep.ac.cn, E-mail: litp@tsinghua.edu.cn [Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing (China)

2011-05-10T23:59:59.000Z

148

TY JOUR  

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

Pseudo isothermal ice crystallization kinetics in the gas diffusion Pseudo isothermal ice crystallization kinetics in the gas diffusion layer of a fuel cell from differential scanning calorimetry JF International Journal of Heat and Mass Transfer A1 Thomas J Dursch A1 Monica A Ciontea A1 Gregory J Trigub A1 Clayton J Radke A1 Adam Z Weber KW crystallization KW differential scanning calorimetry KW gas diffusion layer KW Heat Transfer KW kinetics KW melt KW nonisothermal crystallization KW nucleation KW polyesters KW polymer crystallization KW solidification AB p Non isothermal ice crystallization kinetics in the fibrous gas diffusion layer GDL of a proton exchange membrane fuel cell is investigated using differential scanning calorimetry DSC Non isothermal ice crystallization rates and ice crystallization temperatures are obtained from heat flow

149

Applications of CAT scanning for oil and gas production research  

SciTech Connect

Computer Axial Tomography (CAT scanning) is a valuable tool in production research because it provides the ability to nondestructively identify and evaluate the internal structural characteristics of reservoir core material systems. CAT scanning can be applied to obtain either qualitative (visual) or quantitative (numerical) data. Specific applications include core analysis and fluid flow studies. In this paper, the authors' general explanation of the instrumentation and theory is provided along with specific examples of CAT scanning applications to several reservoir core material systems.

Coles, M.E.; Muegge, E.L.; Sprunt, E.S. (Mobil Research and Development Corp., Dallas, TX (United States))

1991-04-01T23:59:59.000Z

150

True Along-Track Scan to Improve Radiation Budget Estimations  

Science Conference Proceedings (OSTI)

Multiangle approaches for radiance-to-flux conversion require accurate coregistration between the observations from nadir- and oblique-viewing directions. The along-track mode of Earth Radiation Budget (ERB) scanning instruments, such as the ...

Michel Capderou; Michel Viollier

2006-08-01T23:59:59.000Z

151

Open Source Scanning Probe Microscopy Control Software package GXSM  

SciTech Connect

GXSM is a full featured and modern scanning probe microscopy (SPM) software. It can be used for powerful multidimensional image/data processing, analysis, and visualization. Connected to an instrument, it is operating many different flavors of SPM, e.g., scanning tunneling microscopy and atomic force microscopy or, in general, two-dimensional multichannel data acquisition instruments. The GXSM core can handle different data types, e.g., integer and floating point numbers. An easily extendable plug-in architecture provides many image analysis and manipulation functions. A digital signal processor subsystem runs the feedback loop, generates the scanning signals, and acquires the data during SPM measurements. The programmable GXSM vector probe engine performs virtually any thinkable spectroscopy and manipulation task, such as scanning tunneling spectroscopy or tip formation. The GXSM software is released under the GNU general public license and can be obtained via the internet.

Zahl, P.; Wagner, T.; Moller, R.; Klust, A.

2010-05-01T23:59:59.000Z

152

Achieving sub-10-nm resolution using scanning electron beam lithography  

E-Print Network (OSTI)

Achieving the highest possible resolution using scanning-electron-beam lithography (SEBL) has become an increasingly urgent problem in recent years, as advances in various nanotechnology applications have driven demand for ...

Cord, Bryan M. (Bryan Michael), 1980-

2009-01-01T23:59:59.000Z

153

Simulation and characterization of a miniaturized Scanning Electron Microscope  

Science Conference Proceedings (OSTI)

A miniaturized Scanning Electron Microscope (mini-SEM) for in-situ lunar investigations is being developed at NASA Marshall Space Flight Center with colleagues from the University of Alabama in Huntsville (UAH), Advanced Research Systems (ARS), and the ...

Jessica. A. Gaskin; Gregory A. Jerman; Stephanie Medley; Don Gregory; Terry O. Abbott; Allen R. Sampson

2011-03-01T23:59:59.000Z

154

Genome scanning : an AFM-based DNA sequencing technique  

E-Print Network (OSTI)

Genome Scanning is a powerful new technique for DNA sequencing. The method presented in this thesis uses an atomic force microscope with a functionalized cantilever tip to sequence single stranded DNA immobilized to a mica ...

Elmouelhi, Ahmed (Ahmed M.), 1979-

2003-01-01T23:59:59.000Z

155

Regular Scanning Tunneling Microscope Tips can be Intrinsically Chiral  

Science Conference Proceedings (OSTI)

We report our discovery that regular scanning tunneling microscope tips can themselves be chiral. This chirality leads to differences in electron tunneling efficiencies through left- and right-handed molecules, and, when using the tip to electrically excite molecular rotation, large differences in rotation rate were observed which correlated with molecular chirality. As scanning tunneling microscopy is a widely used technique, this result may have unforeseen consequences for the measurement of asymmetric surface phenomena in a variety of important fields.

Tierney, Heather L.; Murphy, Colin J.; Sykes, E. Charles H. [Department of Chemistry, Tufts University, Medford, Massachusetts 02155-5813 (United States)

2011-01-07T23:59:59.000Z

156

A novel random access scan flip-flop design  

E-Print Network (OSTI)

Serial scan design causes unnecessary switching activity during testing causing enormous power dissipation. The test time increases enormously with the increase in number of flip-flops. An alternate to serial scan architecture is Random Access Scan (RAS). Here every flip-flop is uniquely addressed using an address decoder. Although it may seem to have solved most of the current problems associated with testing integrated circuits, yet one may impulsively conclude that the routing and area overhead associated with RAS is prohibitive. We present a design of the RAS flip-flop which uses a unique “toggle” mechanism, possible only in RAS. We minimize the number of gates (transistors) and eliminate the need for two globally routed (scan in and test control) signals present in earlier designs. Our design is built keeping in focus the address decoder complexity to a bare minimum. Our multistage scan-out system enables the addressed flip-flop to be observed without compromising performance due to a slow output bus. We have estimated the additional gates required to implement RAS over serial scan (SS). The design obtained equal fault coverage, 60 % test vector reduction and 99 % lesser power dissipation as compared to SS. 1.

S. Mudlapur; Vishwani D. Agrawal; Adit D. Singh

2005-01-01T23:59:59.000Z

157

On Free Stochastic Differential Equations  

E-Print Network (OSTI)

The paper derives an equation for the Cauchy transform of the solution of a free stochastic differential equation (SDE). This new equation is used to solve several particular examples of free SDEs.

Kargin, Vladsislav

2011-01-01T23:59:59.000Z

158

A Portable Differential Psychrometer System  

Science Conference Proceedings (OSTI)

The construction and field operation of a portable differential psychrometer system is described. Portability is provided by means of a dc powered ventilation system. Examples of temperature and vapor pressure gradients measured with the ...

D. S. Munro

1980-02-01T23:59:59.000Z

159

Differentially private data release through multidimensional partitioning  

Science Conference Proceedings (OSTI)

Differential privacy is a strong notion for protecting individual privacy in privacy preserving data analysis or publishing. In this paper, we study the problem of differentially private histogram release based on an interactive differential privacy ...

Yonghui Xiao; Li Xiong; Chun Yuan

2010-09-01T23:59:59.000Z

160

A Technique to Reduce Peak Current and Average Power Dissipation in Scan Designs by Limited Capture  

Science Conference Proceedings (OSTI)

In this paper, a technique that can efficiently reduce peak and average switching activity during test application is proposed. The proposed method does not require any specific clock tree construction, special scan cells, or scan chain reordering. Test ... Keywords: ATPG, peak current reduction, average power dissipation, scan designs, clock tree construction, special scan cells, scan chain reordering

Seongmoon Wang; Wenlong Wei

2007-01-01T23:59:59.000Z

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


161

Coordinate-Independent Computations on Differential Equations  

E-Print Network (OSTI)

This project investigates the computational representation of differentiable manifolds, with the primary goal of solving partial differential equations using multiple coordinate systems on general n- dimensional spaces. ...

Lin, Kevin K.

1998-03-01T23:59:59.000Z

162

Scanning Transmission X-ray Microscopy: Applications in Atmospheric Aerosol Research  

E-Print Network (OSTI)

G. R. et al. Scanning transmission X-ray microscopy: A newwith the scanning transmission X-ray microscope at BESSY II.T. et al. Scanning transmission X-ray microscopy imaging of

Moffet, Ryan C.

2011-01-01T23:59:59.000Z

163

Volume Scanning Strategies for 3D Wind Retrieval from Dual-Doppler Lidar Measurements  

Science Conference Proceedings (OSTI)

Dual-Doppler lidar volume scans for 3D wind retrieval must accommodate the conflicting goals of dense spatial coverage and short scan duration. In this work, various scanning strategies are evaluated with semisynthetic wind fields from analytical ...

Susanne Drechsel; Georg J. Mayr; Michel Chong; Fotini K. Chow

2010-11-01T23:59:59.000Z

164

Analytical scanning evanescent microwave microscope and control stage  

DOE Patents (OSTI)

A scanning evanescent microwave microscope (SEMM) that uses near-field evanescent electromagnetic waves to probe sample properties is disclosed. The SEMM is capable of high resolution imaging and quantitative measurements of the electrical properties of the sample. The SEMM has the ability to map dielectric constant, loss tangent, conductivity, electrical impedance, and other electrical parameters of materials. Such properties are then used to provide distance control over a wide range, from to microns to nanometers, over dielectric and conductive samples for a scanned evanescent microwave probe, which enable quantitative non-contact and submicron spatial resolution topographic and electrical impedance profiling of dielectric, nonlinear dielectric and conductive materials. The invention also allows quantitative estimation of microwave impedance using signals obtained by the scanned evanescent microwave probe and quasistatic approximation modeling. The SEMM can be used to measure electrical properties of both dielectric and electrically conducting materials.

Xiang, Xiao-Dong; Gao, Chen; Duewer, Fred; Yang, Hai Tao; Lu, Yalin

2013-01-22T23:59:59.000Z

165

Scanning Transmission Electron Microscopy Investigations of Complex Oxides  

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

Scanning Transmission Electron Microscopy Investigations of Complex Oxides Scanning Transmission Electron Microscopy Investigations of Complex Oxides Monday, May 23, 2011 - 3:30pm SSRL Conference room 137-322 Professor Tom Vogt, NanoCenter & Department of Chemistry, University of South Carolina High-Angle-Annular-Dark-Field/Scanning Transmission Electron Microscopy (HAADF/STEM) is a technique uniquely suited for detailed studies of the structure and composition of complex oxides. The HAADF detector collects electrons which have interact inelastically with the potentials of the atoms in the specimen and therefore resembles the better known Z2 (Z is atomic number) Rutherford scattering. One class of important catalysts consists of bronzes based on pentagonal {Mo6O21} building units; these include Mo5O14 and Mo17O47. In the last 20 years, new materials doped with

166

Analytical scanning evanescent microwave microscope and control stage  

DOE Patents (OSTI)

A scanning evanescent microwave microscope (SEMM) that uses near-field evanescent electromagnetic waves to probe sample properties is disclosed. The SEMM is capable of high resolution imaging and quantitative measurements of the electrical properties of the sample. The SEMM has the ability to map dielectric constant, loss tangent, conductivity, electrical impedance, and other electrical parameters of materials. Such properties are then used to provide distance control over a wide range, from to microns to nanometers, over dielectric and conductive samples for a scanned evanescent microwave probe, which enable quantitative non-contact and submicron spatial resolution topographic and electrical impedance profiling of dielectric, nonlinear dielectric and conductive materials. The invention also allows quantitative estimation of microwave impedance using signals obtained by the scanned evanescent microwave probe and quasistatic approximation modeling. The SEMM can be used to measure electrical properties of both dielectric and electrically conducting materials.

Xiang, Xiao-Dong (Danville, CA); Gao, Chen (Anhui, CN); Duewer, Fred (Albany, CA); Yang, Hai Tao (Albany, CA); Lu, Yalin (Chelmsford, MA)

2009-06-23T23:59:59.000Z

167

PARALLEL ION BEAM PROFILE SCAN USING LASER WIRE  

Science Conference Proceedings (OSTI)

We report on the world s first experiment of a parallel profile scan of the hydrogen ion (H-) beam using a laser wire system. The system was developed at the superconducting linac of the Spallation Neutron Source (SNS) accelerator complex. The laser wire profile scanner is based on a photo-detachment process and therefore can be conducted on an operational H- beam in a nonintrusive manner. The parallel profile scanning system makes it possible to simultaneously measure profiles of the 1-MW neutron production H- beam at 9 different locations of the linac by using a single light source. This paper describes the design, optical system and software platform development, and measurement results of the parallel profile scanning system.

Liu, Yun [ORNL; Aleksandrov, Alexander V [ORNL; Huang, Chunning [ORNL; Long, Cary D [ORNL; Dickson, Richard W [ORNL

2013-01-01T23:59:59.000Z

168

Composition analysis by scanning femtosecond laser ultraprobing (CASFLU).  

DOE Patents (OSTI)

The composition analysis by scanning femtosecond ultraprobing (CASFLU) technology scans a focused train of extremely short-duration, very intense laser pulses across a sample. The partially-ionized plasma ablated by each pulse is spectrometrically analyzed in real time, determining the ablated material's composition. The steering of the scanned beam thus is computer directed to either continue ablative material-removal at the same site or to successively remove nearby material for the same type of composition analysis. This invention has utility in high-speed chemical-elemental, molecular-fragment and isotopic analyses of the microstructure composition of complex objects, e.g., the oxygen isotopic compositions of large populations of single osteons in bone.

Ishikawa, Muriel Y. (Livermore, CA); Wood, Lowell L. (Simi Valley, CA); Campbell, E. Michael (Danveille, CA); Stuart, Brent C. (Livermore, CA); Perry, Michael D. (Livermore, CA)

2002-01-01T23:59:59.000Z

169

Monte Carlo Methods and Partial Differential Equations ...  

Science Conference Proceedings (OSTI)

... Up, Monte Carlo Methods and Partial Differential Equations: Algorithms and Implications for High-Performance Computing. ...

2013-08-16T23:59:59.000Z

170

A Scanning Frequency Mode for Ion Cyclotron Mobility Spectrometry  

E-Print Network (OSTI)

A new operational mode for an ion cyclotron mobility spectrometry instrument is explored as a possibleA Scanning Frequency Mode for Ion Cyclotron Mobility Spectrometry Rebecca S. Glaskin, Stephen J that are applied to segmented regions of a circular drift tube. Ions with mobilities that are resonant

Clemmer, David E.

171

A 35-GHz Scanning Doppler Radar for Fog Observations  

Science Conference Proceedings (OSTI)

To observe fog, a 35-GHz scanning Doppler radar was designed, assembled, and tested. The radar, mounted on a flatbed vehicle for portability, transmits peak powers of 100 kW in a pulse of 0.5-µs width and a beamwidth of 0.3°. Thus, a reflectivity ...

Kyosuke Hamazu; Hiroyuki Hashiguchi; Toshio Wakayama; Tomoya Matsuda; Richard J. Doviak; Shoichiro Fukao

2003-07-01T23:59:59.000Z

172

Scanning multichannel microwave radiometer snow water equivalent assimilation  

E-Print Network (OSTI)

climatic driver through the surface albedo's role in energy and water budgets [e.g., Yeh et al., 1983Scanning multichannel microwave radiometer snow water equivalent assimilation Jiarui Dong,1 due to complicating effects, including distance to open water, presence of wet snow, and presence

Houser, Paul R.

173

Large energy-spread beam diagnostics through quadrupole scans  

Science Conference Proceedings (OSTI)

The Facility for Advanced Accelerator and Experimental Tests (FACET) is a new user facility at the SLAC National Accelerator Laboratory, servicing next-generation accelerator experiments. The 1.5% RMS energy spread of the FACET beam causes large chromatic aberrations in optics. These aberrations necessitate updated quadrupole scan fits to remain accurate.

Frederico, Joel; Adli, Erik; Hogan, Mark; Raubenheimer, Tor [SLAC National Accelerator Laboratory (United States)

2012-12-21T23:59:59.000Z

174

100% container scanning : security policy implications for global supply chains  

E-Print Network (OSTI)

On August 3, 2007, President George Bush signed into law HR1 the "Implementing Recommendations of the 9/11 Commission Act of 2007." The 9/11 Act requires 100% scanning of US-bound containers at foreign seaports by 2012 ...

Bennett, Allison C. (Allison Christine)

2008-01-01T23:59:59.000Z

175

Scanning transmission electron microscopy of gate stacks with HfO2 dielectrics and TiN electrodes  

E-Print Network (OSTI)

Scanning transmission electron microscopy of gate stacksEELS) in scanning transmission electron microscopy were usedWe use scanning transmission electron microscopy (STEM)

Agustin, Melody P.; Fonseca, Leo R. C.; Hooker, Jacob C.; Stemmer, Susanne

2005-01-01T23:59:59.000Z

176

Instrument Series: Microscopy Ultra-High Vacuum, Low- Temperature Scanning  

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

Low- Low- Temperature Scanning Probe Microscope EMSL's ultra-high vacuum, low-temperature scanning probe microscope instrument, or UHV LT SPM, is the preeminent system dedicated to surface chemistry and physics at low temperatures down to 5 K. Operating at low temperatures provides high mechanical stability, superior vacuum conditions, and negligible drift for long-term experiments. With thermal diffusion being entirely suppressed, stable imaging becomes possible even for weakly bound species. The system is primarily used for probing single-site chemical reactivity, while the combination with a hyperthermal molecular beam allows the study of important chemical processes at energies corresponding to the operational temperatures well beyond typical UHV studies. The LT SPM provides

177

Instrument Series: Microscopy Aberration-Corrected Scanning/Transmission  

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

Aberration-Corrected Aberration-Corrected Scanning/Transmission Electron Microscope EMSL's aberration-corrected Titan 80-300(tm) scanning/transmission electron microscope (S/TEM) provides high-resolution imaging with sub-angstrom resolution and spectroscopic capabilities. This state-of-the-art instrument is equipped with a Schottky field-emission electron source, an electron gun monochromator, CEOS hexapole spherical aberration corrector for the probe-forming lens, high-angle annular dark field (HAADF) detector, an X-ray spectrometer (EDS), and a high-resolution Gatan Imaging Filter (GIF). The selection of electron energy between 80 kV and 300 kV enables optimized imaging for a variety of samples, including electron beam sensitive materials. Research Applications

178

Computer-intensive rate estimation, diverging statistics and scanning  

E-Print Network (OSTI)

A general rate estimation method is proposed that is based on studying the in-sample evolution of appropriately chosen diverging/converging statistics. The proposed rate estimators are based on simple least squares arguments, and are shown to be accurate in a very general setting without requiring the choice of a tuning parameter. The notion of scanning is introduced with the purpose of extracting useful subsamples of the data series; the proposed rate estimation method is applied to different scans, and the resulting estimators are then combined to improve accuracy. Applications to heavy tail index estimation as well as to the problem of estimating the long memory parameter are discussed; a small simulation study complements our theoretical results.

McElroy, Tucker

2007-01-01T23:59:59.000Z

179

Measurement of Semiconductor Surface Potential using the Scanning Electron Microscope  

SciTech Connect

We calibrate the secondary electron signal from a standard scanning electron microscope to voltage, yielding an image of the surface or near-surface potential. Data on both atomically abrupt heterojunction GaInP/GaAs and diffused homojunction Si solar cell devices clearly show the expected variation in potential with position and applied bias, giving depletion widths and locating metallurgical junctions to an accuracy better than 10 nm. In some images, distortion near the p-n junction is observed, seemingly consistent with the effects of lateral electric fields (patch fields). Reducing the tube bias removes this distortion. This approach results in rapid and straightforward collection of near-surface potential data using a standard scanning electron microscope.

Heath, J. T.; Jiang, C. S.; Al-Jassim, M. M.

2012-02-15T23:59:59.000Z

180

PHENIX Experiment Results from the RHIC Beam Energy Scan Program  

E-Print Network (OSTI)

The PHENIX Experiment at RHIC has conducted a beam energy scan at several collision energies in order to search for signatures of the QCD critical point and the onset of deconfinement. PHENIX has conducted measurements of transverse energy production, muliplicity fluctuations, the skewness and kurtosis of net charge distributions, Hanbury-Brown Twiss correlations, charged hadron flow, and energy loss. The data analyzed to date show no significant indications of the presence of the critical point.

J. T. Mitchell for the PHENIX Collaboration

2013-08-09T23:59:59.000Z

Note: This page contains sample records for the topic "differential scanning calorimetry" 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

PHENIX Experiment Results from the RHIC Beam Energy Scan Program  

E-Print Network (OSTI)

The PHENIX Experiment at RHIC has conducted a beam energy scan at several collision energies in order to search for signatures of the QCD critical point and the onset of deconfinement. PHENIX has conducted measurements of transverse energy production, muliplicity fluctuations, the skewness and kurtosis of net charge distributions, Hanbury-Brown Twiss correlations, charged hadron flow, and energy loss. The data analyzed to date show no significant indications of the presence of the critical point.

,

2013-01-01T23:59:59.000Z

182

Alignment and Aperture Scan at the Fermilab Booster  

Science Conference Proceedings (OSTI)

The Fermilab Booster is currently in the process of an intensity upgrade referred to as the Proton Improvement Plan (PIP). The goal of PIP is to have the Booster provide a proton beam flux of 2 x 10{sup 17} protons/hour. This is almost double the current operation of 1.1 x 10{sup 17} protons/hour. Beam losses in the machine due to the increased flux will create larger integrated doses on aperture limiting components that will need to be mitigated. The Booster accelerates beam from 400 MeV to 8 GeV at a rep rate of 15hz and then extracts beam to the Main Injector. Several percent of the beam is lost within 3 msec after injection in the early part of acceleration. The aperture at injection energy was recently measured using corrector scans. Along with magnet survey data and aperture scan data a plan to realign the magnets in the Booster was developed and implemented in May 2012. The beam studies, analysis of the scan and alignment data, and the result of the magnet moves are presented.

Seiya, K.; Lackey, J.; Marsh, W.; Pellico, W.; Still, D.; Triplet, K.; Waller, A.; /Fermilab

2012-05-01T23:59:59.000Z

183

Numerical solution methods for differential game problems  

E-Print Network (OSTI)

Differential game theory provides a potential means for the parametric analysis of combat engagement scenarios. To determine its viability for this type of analysis, three frameworks for solving differential game problems ...

Johnson, Philip A. (Philip Arthur)

2009-01-01T23:59:59.000Z

184

Numerical Differentiation and Integration - CECM - Simon Fraser ...  

E-Print Network (OSTI)

... ' &. $. %. Numerical Differentiation and Integration. Simon Fraser University ? Surrey Campus. MACM 316 ? Spring 2005. Instructor: Ha Le. 1 ...

185

alpha-amylase and Glucose Oxidase as Promising Improvers for Wheat Bread  

Science Conference Proceedings (OSTI)

The effects of alpha-amylase and glucose oxidase as bread improvers on the textural and thermal properties of bread were evaluated by the rapid viscosity analysis and differential scanning calorimetry. It was found that alpha-amylase and glucose oxidase ... Keywords: alpha-amylase, Glucose oxidase, viscosity, Bread quality

Jie Zeng; Haiyan Gao; Guanglei Li; Xinhong Liang

2011-04-01T23:59:59.000Z

186

(National Institute for Petroleum and Energy Research) 1988 annual report  

Science Conference Proceedings (OSTI)

The following research programs from NIPER are described: jet fuel stability, entrainers in carbon dioxide floods, differential scanning calorimetry simulation of crosslinking in a chemical flood, analytical methods reservoir characterization, strategic petroleum reserve support, microbial EOR, marine diesel fuel requirements, oil mining, hydrodenitrogenation of indole and petrographic image analysis. Individual projects are processed separately for the data bases. (CBS)

Not Available

1989-09-01T23:59:59.000Z

187

Nonferromagnetic linear variable differential transformer  

DOE Patents (OSTI)

A nonferromagnetic linear variable differential transformer for accurately measuring mechanical displacements in the presence of high magnetic fields is provided. The device utilizes a movable primary coil inside a fixed secondary coil that consists of two series-opposed windings. Operation is such that the secondary output voltage is maintained in phase (depending on polarity) with the primary voltage. The transducer is well-suited to long cable runs and is useful for measuring small displacements in the presence of high or alternating magnetic fields.

Ellis, James F. (Powell, TN); Walstrom, Peter L. (Oak Ridge, TN)

1977-06-14T23:59:59.000Z

188

Comparison of SOFC Cathode Microstructure Quantified using X-ray Nanotomography and Focused Ioni Beam-scanning Electron Microscopy  

Science Conference Proceedings (OSTI)

X-ray nanotomography and focused ion beam scanning electron microscopy (FIB-SEM) have been applied to investigate the complex 3D microstructure of solid oxide fuel cell (SOFC) electrodes at spatial resolutions of 45 nm and below. The application of near edge differential absorption for x-ray nanotomography and energy selected backscatter detection for FIB-SEM enable elemental mapping within the microstructure. Using these methods, non-destructive 3D x-ray imaging and FIB-SEM serial sectioning have been applied to compare three-dimensional elemental mapping of the LSM, YSZ, and pore phases in the SOFC cathode microstructure. The microstructural characterization of an SOFC cathode is reported based on these measurements. The results presented demonstrate the viability of x-ray nanotomography as a quantitative characterization technique and provide key insights into the SOFC cathode microstructure.

G Nelson; W Harris; J Lombardo; J Izzo Jr.; W Chiu; P Tanasini; M Cantoni; J Van herle; C Comninellis; et al.

2011-12-31T23:59:59.000Z

189

Visual Scanning Hartmann Optical Tester (VSHOT) Uncertainty Analysis (Milestone Report)  

DOE Green Energy (OSTI)

In 1997, an uncertainty analysis was conducted of the Video Scanning Hartmann Optical Tester (VSHOT). In 2010, we have completed a new analysis, based primarily on the geometric optics of the system, and it shows sensitivities to various design and operational parameters. We discuss sources of error with measuring devices, instrument calibrations, and operator measurements for a parabolic trough mirror panel test. These help to guide the operator in proper setup, and help end-users to understand the data they are provided. We include both the systematic (bias) and random (precision) errors for VSHOT testing and their contributions to the uncertainty. The contributing factors we considered in this study are: target tilt; target face to laser output distance; instrument vertical offset; laser output angle; distance between the tool and the test piece; camera calibration; and laser scanner. These contributing factors were applied to the calculated slope error, focal length, and test article tilt that are generated by the VSHOT data processing. Results show the estimated 2-sigma uncertainty in slope error for a parabolic trough line scan test to be +/-0.2 milliradians; uncertainty in the focal length is +/- 0.1 mm, and the uncertainty in test article tilt is +/- 0.04 milliradians.

Gray, A.; Lewandowski, A.; Wendelin, T.

2010-10-01T23:59:59.000Z

190

Beam energy scan using a viscous hydro+cascade model  

E-Print Network (OSTI)

Following the experimental program at BNL RHIC, we perform a similar "energy scan" using 3+1D viscous hydrodynamics coupled to the UrQMD hadron cascade, and study the collision energy dependence of pion and kaon rapidity distributions and $m_T$-spectra, as well as charged hadron elliptic flow. To this aim the equation of state for finite baryon density from a Chiral model coupled to the Polyakov loop is employed for hydrodynamic stage. 3D initial conditions from UrQMD are used to study gradual deviation from boost-invariant scaling flow. We find that the inclusion of shear viscosity in the hydrodynamic stage of evolution consistently improves the description of the data for Pb-Pb collisions at CERN SPS, as well as of the elliptic flow measurements for Au-Au collisions in the Beam Energy Scan (BES) program at BNL RHIC. The suggested value of shear viscosity is $\\eta/s\\ge0.2$ for $\\sqrt{s_{NN}}=6.3\\dots39$ GeV.

Karpenko, Iu A; Huovinen, P; Petersen, H

2013-01-01T23:59:59.000Z

191

Attitude Determination from a Balloon-Borne Radiometer Using Two-Sided Limb Scanning  

Science Conference Proceedings (OSTI)

The determination of the horizontal attitude of a balloon-borne, infrared, limb-scanning radiometer is discussed. In particular, the relationship between scan-angle, as measured by the instrument, and the tangent height of the ray path through ...

J. R. Drummond; D. Turner; A. Ashton

1986-03-01T23:59:59.000Z

192

Using unlabeled Wi-Fi scan data to discover occupancy patterns of private households  

Science Conference Proceedings (OSTI)

This poster presents the homeset algorithm, a lightweight approach to estimate occupancy schedules of private households. The algorithm relies on the mobile phones of households' occupants to collect Wi-Fi scans. The scans are then used to determine ...

Wilhelm Kleiminger, Christian Beckel, Anind Dey, Silvia Santini

2013-11-01T23:59:59.000Z

193

Layout-Aware Multi-Layer Multi-Level Scan Tree Synthesis  

Science Conference Proceedings (OSTI)

In this paper, we propose a layout-aware scan tree synthesis methodology. Scan tree can greatly reduce test data volume, which is very desirable in SOC testing. However, previous researches on scan tree synthesis have not considered routing issues in ...

Sying-Jyan Wang; Xin-Long Li; Katherine Shu-Min Li

2007-10-01T23:59:59.000Z

194

Advanced Photon Source | Combining Scanning Probe Microscopy and  

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

27.2013 27.2013 Researchers from NSLS-II visit SXSPM team at Argonne Synchrotron x-ray scanning tunneling microscopy will soon also be developed at the National Synchrotron Light Source (NSLS-II) at Brookhaven National Laboratory (BNL). In order to establish collaboration between the two National Laboratories, Drs. Evgeny Nazaretski and Hui Yan fom BNL visited Argonne to learn more about recent progress made in the SXSPM project. During the 2-day visit the teams discussed mutual scientific goals and strategies to achieve them. NSLS-II will be a new state-of-the-art, medium-energy electron storage ring at BNL designed to deliver high intensity and brightness. Construction of the NSLS-II's ring building began in March 2009. The new facility will begin operating in 2014

195

Advanced Photon Source | Combining Scanning Probe Microscopy and  

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

APS APS SXSPM News Researchers from NSLS-II visit SXSPM team at Argonne (November 27, 2013) Cummings presents invited talk at magnetism meeting (November 11, 2013) Invited talk at ACSIN-12 & ICSPM21 in Japan (November 11, 2013) Nanoscience Seminar presented at Tokyo University (November 01, 2013) Scientists study old photos for new solutions to corrosion (October 21, 2013) More News Featured Image Recent Publications Kangkang Wang, Daniel Rosenmann, Martin Holt, Robert Winarski, Saw-Wai Hla, and Volker Rose, "An easy-to-implement filter for separating photo-excited signals from topography in scanning tunneling microscopy", Rev. Sci. Instrum. 84, 063704 (2013). More SXSPM Publications Upcoming Presentations V. Rose, 41st Conference on the Physics and Chemistry of Surfaces and Interfaces (PCSI-41) (Invited Speaker)

196

Advanced Photon Source | Combining Scanning Probe Microscopy and  

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

01.2013 01.2013 Nanoscience Seminar presented at Tokyo University On November 1, 2013, Volker Rose was invited to present the Nanoscience Seminar at the Institute of Solid State Physics (ISSP) of the University of Tokyo. In his seminar he discussed the physical principles of Synchrotron X-ray Scanning Tunneling Microscopy (SXSTM) as well as the recent progress made by his team at the Advanced Photon Source. He was invited by Prof. Yukio Hasegawa, who himself conducts SXSTM experiment at the Photon Factory in Tsukuba, Japan. The ISSP serves as the central laboratory of materials science in Japan equipped with state-of-art facilities. It was relocated to the new campus in Kashiwa of the University of Tokyo in 2000 after the 43 years of activities at the Roppongi campus in downtown Tokyo. Here ISSP is focusing

197

In situ laser processing in a scanning electron microscope  

Science Conference Proceedings (OSTI)

Laser delivery probes using multimode fiber optic delivery and bulk focusing optics have been constructed and used for performing materials processing experiments within scanning electron microscope/focused ion beam instruments. Controlling the current driving a 915-nm semiconductor diode laser module enables continuous or pulsed operation down to sub-microsecond durations, and with spot sizes on the order of 50 {micro}m diameter, achieving irradiances at a sample surface exceeding 1 MW/cm{sup 2}. Localized laser heating has been used to demonstrate laser chemical vapor deposition of Pt, surface melting of silicon, enhanced purity, and resistivity via laser annealing of Au deposits formed by electron beam induced deposition, and in situ secondary electron imaging of laser induced dewetting of Au metal films on SiO{sub x}.

Roberts, Nicholas [University of Tennessee, Knoxville (UTK); Fowlkes, Jason Davidson [ORNL; Rack, Prof. Philip [University of Tennessee, Knoxville (UTK); Moore, Tom [OmniProbe, Inc.; Magel, Greg [OmniProbe, Inc.; Hartfield, Cheryl [OmniProbe, Inc.

2012-01-01T23:59:59.000Z

198

In situ laser processing in a scanning electron microscope  

SciTech Connect

Laser delivery probes using multimode fiber optic delivery and bulk focusing optics have been constructed and used for performing materials processing experiments within scanning electron microscope/focused ion beam instruments. Controlling the current driving a 915-nm semiconductor diode laser module enables continuous or pulsed operation down to sub-microsecond durations, and with spot sizes on the order of 50 {mu}m diameter, achieving irradiances at a sample surface exceeding 1 MW/cm{sup 2}. Localized laser heating has been used to demonstrate laser chemical vapor deposition of Pt, surface melting of silicon, enhanced purity, and resistivity via laser annealing of Au deposits formed by electron beam induced deposition, and in situ secondary electron imaging of laser induced dewetting of Au metal films on SiO{sub x}.

Roberts, Nicholas A.; Magel, Gregory A.; Hartfield, Cheryl D.; Moore, Thomas M.; Fowlkes, Jason D.; Rack, Philip D. [Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996 (United States) and Omniprobe, Inc., an Oxford Instruments Company, 10410 Miller Rd., Dallas, Texas 75238 (United States); Omniprobe, Inc., an Oxford Instruments Company, 10410 Miller Rd., Dallas, Texas 75238 (United States); Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States); Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996 (United States) and Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)

2012-07-15T23:59:59.000Z

199

The theory and practice of high resolution scanning electron microscopy  

Science Conference Proceedings (OSTI)

Recent advances in instrumentation have produced the first commercial examples of what can justifiably be called High Resolution Scanning Electron Microscopes. The key components of such instruments are a cold field emission gun, a small-gap immersion probe-forming lens, and a clean dry-pumped vacuum. The performance of these microscopes is characterized by several major features including a spatial resolution, in secondary electron mode on solid specimens, which can exceed 1nm on a routine basis; an incident probe current density of the order of 10{sup 6} amps/cm{sup 2}; and the ability to maintain these levels of performance over an accelerating voltage range of from 1 to 30keV. This combination of high resolution, high probe current, low contamination and flexible electron-optical conditions provides many new opportunitites for the application of the SEM to materials science, physics, and the life sciences. 27 refs., 14 figs.

Joy, D.C. (Tennessee Univ., Knoxville, TN (USA) Oak Ridge National Lab., TN (USA))

1990-01-01T23:59:59.000Z

200

Software requirements definition Shipping Cask Analysis System (SCANS)  

SciTech Connect

The US Nuclear Regulatory Commission (NRC) staff reviews the technical adequacy of applications for certification of designs of shipping casks for spent nuclear fuel. In order to confirm an acceptable design, the NRC staff may perform independent calculations. The current NRC procedure for confirming cask design analyses is laborious and tedious. Most of the work is currently done by hand or through the use of a remote computer network. The time required to certify a cask can be long. The review process may vary somewhat with the engineer doing the reviewing. Similarly, the documentation on the results of the review can also vary with the reviewer. To increase the efficiency of this certification process, LLNL was requested to design and write an integrated set of user-oriented, interactive computer programs for a personal microcomputer. The system is known as the NRC Shipping Cask Analysis System (SCANS). The computer codes and the software system supporting these codes are being developed and maintained for the NRC by LLNL. The objective of this system is generally to lessen the time and effort needed to review an application. Additionally, an objective of the system is to assure standardized methods and documentation of the confirmatory analyses used in the review of these cask designs. A software system should be designed based on NRC-defined requirements contained in a requirements document. The requirements document is a statement of a project's wants and needs as the users and implementers jointly understand them. The requirements document states the desired end products (i.e. WHAT's) of the project, not HOW the project provides them. This document describes the wants and needs for the SCANS system. 1 fig., 3 tabs.

Johnson, G.L.; Serbin, R.

1985-07-21T23:59:59.000Z

Note: This page contains sample records for the topic "differential scanning calorimetry" 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

CX-005490: Categorical Exclusion Determination | Department of Energy  

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

0: Categorical Exclusion Determination 0: Categorical Exclusion Determination CX-005490: Categorical Exclusion Determination Thermal Analysis of Radioactive Materials by Thermagravimetric Analysis, Differential Scanning Calorimetry, and Differential Thermal Analysis CX(s) Applied: B3.6 Date: 03/01/2011 Location(s): Aiken, South Carolina Office(s): Environmental Management, Savannah River Operations Office Conducting thermal analyses including, Thermagravimetric Analysis (TGA), Differential Scanning Calorimetry (DSC), Differential Thermal Analysis (DTA), in the 773-A Fabrication Laboratory D0146 Hood on radioactive samples (only d-U) consisting of metals/alloys, ceramics, oxides, and other chemical compounds. DOCUMENT(S) AVAILABLE FOR DOWNLOAD CX-005490.pdf More Documents & Publications CX-004809: Categorical Exclusion Determination

202

Duopoly information sharing with differentiated products  

Science Conference Proceedings (OSTI)

Consider a model where firms own the same technology in linear Cournot duopolies with differentiated products and the slope of the demand curve facing the firm is unknown, containing an own-price effect and a cross-effect. We discuss as follows: whether ... Keywords: Cournot, Cross-effect, Differentiated products, Information sharing, Own-price effect

Jin Xu

2010-07-01T23:59:59.000Z

203

Global Optimization with Nonlinear Ordinary Differential Equations  

Science Conference Proceedings (OSTI)

This paper examines global optimization of an integral objective function subject to nonlinear ordinary differential equations. Theory is developed for deriving a convex relaxation for an integral by utilizing the composition result defined by McCormick ... Keywords: Convex relaxations, dynamic optimization, nonquasimonotone differential equations

Adam B. Singer; Paul I. Barton

2006-02-01T23:59:59.000Z

204

Degenerate Parabolic Stochastic Partial Differential Equations  

E-Print Network (OSTI)

Degenerate Parabolic Stochastic Partial Differential Equations Martina Hofmanov´a Abstract. We study the Cauchy problem for a scalar semilinear degenerate parabolic partial differential equation the notion of kinetic solution which is well suited for degenerate parabolic problems and supplies a good

Paris-Sud XI, Université de

205

Scanning Surface Potential Microscopy of Spore Adhesion on Surfaces  

SciTech Connect

The adhesion of spores of Bacillus anthracis - the cause of anthrax and a likely biological threat - to solid surfaces is an important consideration in cleanup after an accidental or deliberate release. However, because of safety concerns, directly studying B. anthracis spores with advanced instrumentation is problematic. As a first step, we are examining the electrostatic potential of Bacillus thuringiensis (Bt), which is a closely related species that is often used as a simulant to study B. anthracis. Scanning surface potential microscopy (SSPM), also known as Kelvin probe force microscopy (KPFM), was used to investigate the influence of relative humidity (RH) on the surface electrostatic potential of Bt that had adhered to silica, mica, or gold substrates. AFM/SSPM side-by-side images were obtained separately in air, at various values of RH, after an aqueous droplet with spores was applied on each surface and allowed to dry before measurements. In the SSPM images, a negative potential on the surface of the spores was observed compared with that of the substrates. The surface potential decreased as the humidity increased. Spores were unable to adhere to a surface with an extremely negative potential, such as mica.

Lee, Ida [University of Tennessee, Knoxville (UTK); Chung, Eunhyea [Georgia Institute of Technology; Kweon, Hyojin [Georgia Institute of Technology; Yiacoumi, Sotira [Georgia Institute of Technology; Tsouris, Costas [ORNL

2012-01-01T23:59:59.000Z

206

Dual energy scanning beam laminographic x-radiography  

DOE Patents (OSTI)

A multiple x-ray energy level imaging system includes a scanning x-ray beam and two detector design having a first low x-ray energy sensitive detector and a second high x-ray energy sensitive detector. The low x-ray energy detector is placed next to or in front of the high x-ray energy detector. The low energy sensitive detector has small stopping power for x-rays. The lower energy x-rays are absorbed and converted into electrical signals while the majority of the higher energy x-rays pass through undetected. The high energy sensitive detector has a large stopping power for x-rays as well as it having a filter placed between it and the object to absorb the lower energy x-rays. In a second embodiment; a single energy sensitive detector is provided which provides an output signal proportional to the amount of energy in each individual x-ray it absorbed. It can then have an electronic threshold or thresholds set to select two or more energy ranges for the images. By having multiple detectors located at different positions, a dual energy laminography system is possible.

Majewski, Stanislaw (Grafton, VA); Wojcik, Randolph F. (Yorktown, VA)

1998-01-01T23:59:59.000Z

207

Dual energy scanning beam laminographic x-radiography  

DOE Patents (OSTI)

A multiple x-ray energy level imaging system includes a scanning x-ray beam and two detector design having a first low x-ray energy sensitive detector and a second high x-ray energy sensitive detector. The low x-ray energy detector is placed next to or in front of the high x-ray energy detector. The low energy sensitive detector has small stopping power for x-rays. The lower energy x-rays are absorbed and converted into electrical signals while the majority of the higher energy x-rays pass through undetected. The high energy sensitive detector has a large stopping power for x-rays as well as it having a filter placed between it and the object to absorb the lower energy x-rays. In a second embodiment; a single energy sensitive detector is provided which provides an output signal proportional to the amount of energy in each individual x-ray it absorbed. It can then have an electronic threshold or thresholds set to select two or more energy ranges for the images. By having multiple detectors located at different positions, a dual energy laminography system is possible. 6 figs.

Majewski, S.; Wojcik, R.F.

1998-04-21T23:59:59.000Z

208

Review of Recent Results from the RHIC Beam Energy Scan  

E-Print Network (OSTI)

We review recent results from the RHIC beam energy scan (BES) program, aimed to study the Quantum Chromodynamics (QCD) phase diagram. The main goals are to search for the possible phase boundary, softening of equation of state or first order phase transition, and possible critical point. Phase-I of the BES program has recently concluded with data collection for Au+Au collisions at center-of-mass energies ($\\sqrt{s_{NN}}$) of 7.7, 11.5, 19.6, 27, and 39 GeV. Several interesting results are observed for these lower energies where the net-baryon density is high at the mid-rapidity. These results indicate that the matter formed at lower energies (7.7 and 11.5 GeV) is hadron dominated and might not have undergone a phase transition. In addition, the centrality dependence of freeze-out parameters is observed for the first time at lower energies, slope of directed flow for (net)-protons measured versus rapidity shows an interesting behavior at lower energies, and higher moments of net-proton show deviation from Skellam expectations at lower energies. An outlook for the future BES Phase-II program is presented and efforts for the detailed study of QCD phase diagram are discussed.

Lokesh Kumar

2013-11-14T23:59:59.000Z

209

Low-Dose Spiral CT Scans for Early Lung Cancer Detection | Department of  

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

Low-Dose Spiral CT Scans for Early Lung Cancer Detection Low-Dose Spiral CT Scans for Early Lung Cancer Detection Low-Dose Spiral CT Scans for Early Lung Cancer Detection Low-dose spiral computed tomography (CT) scanning is a noninvasive medical imaging test that has been used for the early detection of lung cancer for over 16 years (Sone et al. 1998; Henschke et.al. 1999). A low-dose spiral chest CT differs from a full-dose conventional chest CT scan primarily in the amount of radiation emitted during CT scans. Chest CT, in general, requires less radiation exposure than other CT procedures because the air-filled tissues of the lungs are not as dense as the tissues of other organs (i.e., less x-ray radiation is needed to penetrate the lung). Radiation dose can be further reduced with lung cancer screening due to the

210

Enhancing the Utility of ProstaScint SPECT Scans for Patient Management  

Science Conference Proceedings (OSTI)

This project investigated reducing the artifact content of In-111 ProstaScint SPECT scans for use in treatment planning and management. Forty-one patients who had undergone CT or MRI scans and simultaneous Tc-99m RBC/In-111 ProstaScint SPECT scans were ... Keywords: ProstaScint SPECT artifact elimination, Prostate cancer treatment planning., Reconstruction algorithms, Volume fusion, Volume subtraction

Marilyn E. Noz; Grace Chung; Benjamin Y. Lee; Gerald Q. Maguire, Jr.; J. Keith Dewyngaert; Jay V. Doshi; Elissa L. Kramer; Antoinette D. Murphy-Walcott; Michael P. Zeleznik; Noeun G. Kwak

2006-04-01T23:59:59.000Z

211

Scanning tunneling optical resonance microscopy applied to indium arsenide quantum dot structures.  

E-Print Network (OSTI)

??The technique of Scanning Tunneling Optical Resonance Microscopy (STORM) has been investigated for use on nanostructures. It has been demonstrated as a viable technique to… (more)

Byrnes, Daniel P.

2008-01-01T23:59:59.000Z

212

Video Scanning Hartmann Optical Testing of State-of-the-Art Parabolic Trough Concentrators: Preprint  

DOE Green Energy (OSTI)

This paper describes the Video Scanning Hartmann Optical Test System (VSHOT) used to optically test parabolic trough designs by both Solargenix and Industrial Solar Technology.

Wendelin, T.; May, K.; Gee, R.

2006-06-01T23:59:59.000Z

213

The Use of Micro-X-ray Fluorescence in a Scanning Electron ...  

Science Conference Proceedings (OSTI)

An X-ray gun with focusing capillary fiber optics interfaced with a scanning electron microscope (SEM) is used for semi-quantitative XRF microanalysis by energy ...

214

Electron and Scanning Probe Microscopies | U.S. DOE Office of Science (SC)  

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

Electron and Scanning Probe Microscopies Electron and Scanning Probe Microscopies Materials Sciences and Engineering (MSE) Division MSE Home About Research Areas Energy Frontier Research Centers (EFRCs) DOE Energy Innovation Hubs BES Funding Opportunities The Computational Materials and Chemical Sciences Network (CMCSN) Theoretical Condensed Matter Physics Scientific Highlights Reports and Activities Principal Investigators' Meetings BES Home Research Areas Electron and Scanning Probe Microscopies Print Text Size: A A A RSS Feeds FeedbackShare Page This research area supports basic research in condensed matter physics and materials physics using electron scattering and microscopy and scanning probe techniques. The research includes experiments and theory to understand the atomic, electronic, and magnetic structures of materials.

215

Tandem Differential Mobility Analyzer/Aerodynamic Particle Sizer (APS) Handbook  

SciTech Connect

The tandem differential mobility analyzer (TDMA) is a single instrument that cycles through a series of complementary measurements of the physical properties of size-resolved submicron particles. In 2008, the TDMA was augmented through the addition of an aerodynamic particle sizer (APS), which extends the upper limit of the measured size distribution into the supermicron range. These two instruments are operated in parallel, but because they are controlled by a common computer and because the size distributions measured by the two are integrated in the produced datastreams, they are described together here. Throughout the day, the TDMA sequentially measures submicron aerosol size distributions and size-resolved hygroscopic growth distributions. More specifically, the instrument is operated as a scanning DMA to measure size distributions and as a TDMA to measure size-resolved hygroscopicity. A typical measurement sequence requires roughly 45 minutes. Each morning additional measurements are made of the relative humidity (RH) dependent hygroscopicity and temperature-dependent volatility of size-resolved particles. When the outside temperature and RH are within acceptable ranges, the hydration state of size-resolved particles is also characterized. The measured aerosol distributions complement the array of aerosol instruments in the Aerosol Observing System (AOS) and provide additional details of the light-scattering and cloud-nucleating characteristics of the aerosol.

Collins, D

2010-06-18T23:59:59.000Z

216

Iterated Differential Forms II: Riemannian Geometry Revisited  

E-Print Network (OSTI)

A natural extension of Riemannian geometry to a much wider context is presented on the basis of the iterated differential form formalism developed in math.DG/0605113 and an application to general relativity is given.

A. M. Vinogradov; L. Vitagliano

2006-09-11T23:59:59.000Z

217

Rain Rate Estimates from Differential Polarization Measurements  

Science Conference Proceedings (OSTI)

This paper presents an analysis of the accuracy of rain rate estimates from data observed with a radar that has alternating horizontal and vertical polarization. Theoretical accuracies of rain rates from the reflectivity, the differential ...

M. Sachidananda; D. S. Zrni?

1987-12-01T23:59:59.000Z

218

Backscatter Differential Phase—Estimation and Variability  

Science Conference Proceedings (OSTI)

On the basis of simulations and observations made with polarimetric radars operating at X, C, and S bands, the backscatter differential phase ? has been explored; ? has been identified as an important polarimetric variable that should not be ...

Silke Trömel; Matthew R. Kumjian; Alexander V. Ryzhkov; Clemens Simmer; Malte Diederich

2013-11-01T23:59:59.000Z

219

Superconductive microstrip exhibiting negative differential resistivity  

DOE Patents (OSTI)

A device capable of exhibiting negative differential electrical resistivity over a range of values of current and voltage is formed by vapor- depositing a thin layer of a material capable of exhibiting superconductivity on an insulating substrate, establishing electrical connections at opposite ends of the deposited strip, and cooling the alloy into its superconducting range. The device will exhibit negative differential resistivity when biased in the current- induced resistive state.

Huebener, R.P.; Gallus, D.E.

1975-10-28T23:59:59.000Z

220

Differential Thermal Analysis of Nickel-Base Superalloys  

Science Conference Proceedings (OSTI)

Differential thermal analysis was performed on over 200 nickel-base superalloys that ... differential thermal analysis (DTA) to simply and accurately measure.

Note: This page contains sample records for the topic "differential scanning calorimetry" 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

G-2 and CMS Fast Optical Calorimetry  

SciTech Connect

Final report on CMS funding for the construction, tests and installation of the Forward Hadron Calorimeter.

Winn, David R

2012-08-07T23:59:59.000Z

222

Calorimetry of low mass Pu239 items  

SciTech Connect

Calorimetric assay has the reputation of providing the highest precision and accuracy of all nondestructive assay measurements. Unfortunately, non-destructive assay practitioners and measurement consumers often extend, inappropriately, the high precision and accuracy of calorimetric assay to very low mass items. One purpose of this document is to present more realistic expectations for the random uncertainties associated with calorimetric assay for weapons grade plutonium items with masses of 200 grams or less.

Cremers, Teresa L [Los Alamos National Laboratory; Sampson, Thomas E [Los Alamos National Laboratory

2010-01-01T23:59:59.000Z

223

Collaborating for a "Perfect" Scan of Nuclear Matter ON THE COVER  

E-Print Network (OSTI)

FALL 2008 Collaborating for a "Perfect" Scan of Nuclear Matter #12;ON THE COVER With just.com ENERGY U.S. DEPARTMENT OF #12;2 Collaborating for a "Perfect" Scan of nuclear Matter 6 basic research For Energy Security 18 new radiation detector technology will Help Secure u.S. Cities 14 Capturing the Light

Ohta, Shigemi

224

Joint Estimation of Attenuation and Emission Images from PET Scans Hakan Erdogan and Jeffrey A. Fessler  

E-Print Network (OSTI)

Joint Estimation of Attenuation and Emission Images from PET Scans Hakan Erdogan and Jeffrey A information about the attenuating medium. To use all the available information, we propose a joint estimation optimal use of the information in these two scans, one can derive a joint objective function based on both

Erdogan, Hakan

225

SCAN-Based Compression-Encryption-Hiding for Video on Demand  

Science Conference Proceedings (OSTI)

We present a SCAN-based method for image and video compression-encryption-hiding with application to digital video-on-demand. The software SCAN implementation running on a Pentium IV takes about one second for 25 video frames. As an alternative solution, ... Keywords: Image Video Compression, encryption, information hiding, FPGA, Multimedia on demand

Nikolaos Bourbakis; Apostolos Dollas

2003-07-01T23:59:59.000Z

226

Batch fabrication of cantilever array aperture probes for scanning near-field optical microscopy  

Science Conference Proceedings (OSTI)

We have developed a novel batch fabrication process for cantilever array aperture probes used in scanning near-field optical microscopy (SNOM). The array probes, consisting of 16 parallel cantilevers with each tip having an identical aperture, are proposed ... Keywords: Cantilever probes, Nanofabrication, Scanning near-field optical microscopy (SNOM)

Y. Zhang; K. E. Docherty; J. M. R. Weaver

2010-05-01T23:59:59.000Z

227

Robust Segmentation and Anatomical Labeling of the Airway Tree from Thoracic CT Scans  

Science Conference Proceedings (OSTI)

A method for automatic extraction and labeling of the airway tree from thoracic CT scans is presented and extensively evaluated on 150 scans of clinical dose, low dose and ultra-low dose data, in inspiration and expiration from both relatively healthy ...

Bram Ginneken; Wouter Baggerman; Eva M. Rikxoort

2008-09-01T23:59:59.000Z

228

Microprocessor system to recover data from a self-scanning photodiode array  

SciTech Connect

A microprocessor system developed at Lawrence Livermore Laboratory has expedited the recovery of data describing the low energy x-ray spectra radiated by laser-fusion targets. An Intel microprocessor controls the digitization and scanning of the data stream of an x-ray-sensitive self-scanning photodiode array incorporated in a crystal diffraction spectrometer. (auth)

Koppel, L.N.; Gadd, T.J.

1975-11-01T23:59:59.000Z

229

Measurement of Ocean Wave Directional Spectra Using Doppler Side-Scan Sonar Arrays  

Science Conference Proceedings (OSTI)

A technique is presented for extraction of ocean wave directional spectra using Doppler side-scan sonars. Two 103-kHz steerable side-scan beams from a freely drifting subsurface platform are used to estimate horizontal water surface velocity due ...

Mark V. Trevorrow

1995-06-01T23:59:59.000Z

230

Scanning Eye-Safe Elastic Backscatter Lidar at 1.54 ?m  

Science Conference Proceedings (OSTI)

A field-deployable scanning direct-detection elastic backscatter lidar system that is eye safe at all ranges is presented. The first two-dimensional spatial images created by scanning this new 1.54-?m wavelength system, and time-lapse animations (...

Scott M. Spuler; Shane D. Mayor

2005-06-01T23:59:59.000Z

231

Scanning Doppler Lidar for Input into Short-Term Wind Power Forecasts  

Science Conference Proceedings (OSTI)

Scanning Doppler lidar is a promising technology for improvements in short-term wind power forecasts since it can scan close to the surface and produce wind profiles at a large distance upstream (15–30 km) if the atmosphere has sufficient aerosol ...

Rod Frehlich

2013-02-01T23:59:59.000Z

232

V-101: McAfee VirusScan Enterprise Lets Local Users Gain Elevated  

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

1: McAfee VirusScan Enterprise Lets Local Users Gain Elevated 1: McAfee VirusScan Enterprise Lets Local Users Gain Elevated Privileges V-101: McAfee VirusScan Enterprise Lets Local Users Gain Elevated Privileges February 28, 2013 - 12:05am Addthis PROBLEM: McAfee VirusScan Enterprise Lets Local Users Gain Elevated Privileges PLATFORM: VSE 8.8 Patch 2 with Access Protection, including Self Protection, turned off ABSTRACT: A vulnerability was reported in McAfee VirusScan Enterprise. REFERENCE LINKS: McAfee Security Bulletins ID: SB10038 SecurityTracker Alert ID: 1028209 IMPACT ASSESSMENT: Medium DISCUSSION: When Access Protection has been disabled, a local user can gain full control of the target application IMPACT: A local user can obtain elevated privileges on the target system. SOLUTION: The vendor has issued a fix (8.8 Patch 2 with HF778101, 8.8 Patch 3)

233

V-101: McAfee VirusScan Enterprise Lets Local Users Gain Elevated  

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

1: McAfee VirusScan Enterprise Lets Local Users Gain Elevated 1: McAfee VirusScan Enterprise Lets Local Users Gain Elevated Privileges V-101: McAfee VirusScan Enterprise Lets Local Users Gain Elevated Privileges February 28, 2013 - 12:05am Addthis PROBLEM: McAfee VirusScan Enterprise Lets Local Users Gain Elevated Privileges PLATFORM: VSE 8.8 Patch 2 with Access Protection, including Self Protection, turned off ABSTRACT: A vulnerability was reported in McAfee VirusScan Enterprise. REFERENCE LINKS: McAfee Security Bulletins ID: SB10038 SecurityTracker Alert ID: 1028209 IMPACT ASSESSMENT: Medium DISCUSSION: When Access Protection has been disabled, a local user can gain full control of the target application IMPACT: A local user can obtain elevated privileges on the target system. SOLUTION: The vendor has issued a fix (8.8 Patch 2 with HF778101, 8.8 Patch 3)

234

U-263: Trend Micro InterScan Messaging Security Flaws Permit Cross-Site  

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

3: Trend Micro InterScan Messaging Security Flaws Permit 3: Trend Micro InterScan Messaging Security Flaws Permit Cross-Site Scripting and Cross-Site Request Forgery Attacks U-263: Trend Micro InterScan Messaging Security Flaws Permit Cross-Site Scripting and Cross-Site Request Forgery Attacks September 19, 2012 - 6:00am Addthis PROBLEM: Trend Micro InterScan Messaging Security Flaws Permit Cross-Site Scripting and Cross-Site Request Forgery Attacks PLATFORM: 7.1-Build_Win32_1394; possibly other versions ABSTRACT: A vulnerability was reported in Trend Micro InterScan Messaging Security. reference LINKS: US CERT Vulnerability Note VU#471364 SecurityTracker Alert ID: 1027544 CVE-2012-2995 CVE-2012-2996 Micro Trend IMPACT ASSESSMENT: Medium Discussion: Several scripts do not properly filter HTML code from user-supplied input

235

Chromatin States Accurately Classify Cell Differentiation Stages  

E-Print Network (OSTI)

Gene expression is controlled by the concerted interactions between transcription factors and chromatin regulators. While recent studies have identified global chromatin state changes across cell-types, it remains unclear to what extent these changes are co-regulated during cell-differentiation. Here we present a comprehensive computational analysis by assembling a large dataset containing genome-wide occupancy information of 5 histone modifications in 27 human cell lines (including 24 normal and 3 cancer cell lines) obtained from the public domain, followed by independent analysis at three different representations. We classified the differentiation stage of a cell-type based on its genome-wide pattern of chromatin states, and found that our method was able to identify normal cell lines with nearly 100 % accuracy. We then applied our model to classify the cancer cell lines and found that each can be unequivocally classified as differentiated cells. The differences can be in part explained by the differential activities of three regulatory modules associated with embryonic stem cells. We also found that the ‘‘hotspot’ ’ genes, whose chromatin states change dynamically in accordance to the differentiation stage, are not randomly distributed across the genome but tend to be embedded in multi-gene chromatin

Jessica L. Larson; Guo-cheng Yuan

2012-01-01T23:59:59.000Z

236

Using Radial Basis Functions to Approximate Battery Differential Capacity and Differential Voltage  

Science Conference Proceedings (OSTI)

As part of the Department of Energy’s Applied Battery Research Program, lithium-ion cells of various sizes and chemistries are aged with periodic reference performance tests to ascertain degradation rates. The reference tests included a very slow discharge and charge based on a constant current equal to 1/25th of the rated capacity to elucidate the true electrochemical capacity of the cell. A differential analysis of these data helps to identify the individual kinetic and thermodynamic contributions of the anode and cathode. However, differential curves are very noisy, and previous smoothing methods included simple data reduction and moving averages. This paper introduces an alternative method of finding the differential voltage and differential capacity curves based on radial basis functions. The voltage profile is fit with a number of Gaussian curves, and the resulting model is differentiated. This approach also has the added advantage of assessing model uncertainty based on a bootstrap analysis. The radial basis function method was successfully applied to various lithium-ion chemistries tested under the Applied Battery Research Program. The resulting differential capacity and differential voltage curves were generally smoother than the corresponding curves found by previous methods and also showed little variance, indicating a good model fit. These results imply that the radial basis function technique is a more robust tool for assessing differential data.

Jon P. Christophersen; Steven R. Shaw

2010-02-01T23:59:59.000Z

237

Top differential cross section measurements (Tevatron)  

SciTech Connect

Differential cross sections in the top quark sector measured at the Fermilab Tevatron collider are presented. CDF used 2.7 fb{sup -1} of data and measured the differential cross section as a function of the invariant mass of the t{bar t} system. The measurement shows good agreement with the standard model and furthermore is used to derive limits on the ratio {kappa}/M{sub Pl} for gravitons which decay to top quarks in the Randall-Sundrum model. D0 used 1.0 fb{sup -1} of data to measure the differential cross section as a function of the transverse momentum of the top-quark. The measurement shows a good agreement to the next-to-leading order perturbative QCD prediction and various other standard model predictions.

Jung, Andreas W.

2012-01-01T23:59:59.000Z

238

Geosynthetic clay liners subjected to differential settlement  

SciTech Connect

Geosynthetic clay liners (GCLs), which consist of a thin layer of bentonite attached to one or more geosynthetic materials, are receiving increased use as low-permeability barrier layers in waste-containment systems. Tests were performed in tanks to measure the hydraulic conductivity of GCLs that were subjected to differential settlement. In most cases the GCLs maintained a hydraulic conductivity of 1 {times} 10{sup {minus}7} cm/s or less when subjected to tensile strains of 1{minus}> 10%, depending on the material and test conditions. Overlapped GCL panels maintained their hydraulic integrity despite in-plane slippage of up to 25--100 mm. In general, the ability of GCLs to withstand differential settlement appears to be greater than that of compacted clay liners, but less than that of geomembranes. GCLs are a promising barrier material for situations in which differential settlement is expected, for example, in landfill final covers.

LaGatta, M.D. [Golder Associates, Mt. Laurel, NJ (United States); Boardman, B.T. [Univ. of California, Berkeley, CA (United States). Dept. of Civil Engineering; Cooley, B.H. [GeoSyntec Consultants, Huntington Beach, CA (United States); Daniel, D.E. [Univ. of Illinois, Urbana, IL (United States). Civil Engineering Dept.

1997-05-01T23:59:59.000Z

239

Remote Gamma Scanning System for Characterization of BWR and PWR Fuel Rod Sections  

SciTech Connect

Sometimes challenges with the design and deployment of automated equipment in remote environments deals more with the constraints imposed by the remote environment than it does with the details of the automation. This paper discusses the development of a scanning system used to provide gamma radiation profiles of irradiated fuel rod segments. The system needed the capability to provide axial scans of cut segments of BWR and PWR fuel rods. The scanning location is A-Cell at the Radiochemical Processing Laboratory (RPL) at the Hanford site in Washington State. The criteria for the scanning equipment included axial scanning increments of a tenth of an inch or less, ability to scan fuel rods with diameters ranging from 3/8 inch to 5/8 inch in diameter, and fuel rod segments up to seven feet in length. Constraints imposed by the environment included having the gamma detector and operator controls on the outside of the hot cell and the scanning hardware on the inside of the hot cell. This entailed getting a narrow, collimated beam of radiation from the fuel rod to the detector on the outside of the hot cell while minimizing the radiation exposure caused by openings for the wires and cables traversing the hot cell walls. Setup and operation of all of the in-cell hardware needed to accommodate limited access ports and use of hot cell manipulators. The radiation levels inside the cell also imposed constraints on the materials used.

Crowell, Shannon L.; Alzheimer, James M.

2011-08-08T23:59:59.000Z

240

Design of a scanning gate microscope in a cryogen-free dilution refrigerator  

E-Print Network (OSTI)

We report on our design of a scanning gate microscope housed in a cryogen-free dilution refrigerator with a base temperature of 15 mK. The recent increase in efficiency of pulse tube cryocoolers has made cryogen-free systems popular in recent years. However, this new style of cryostat presents challenges for performing scanning probe measurements, mainly as a result of the vibrations introduced by the cryocooler. We demonstrate scanning with root-mean-square vibrations of 0.8 nm at 3 K and 2.1 nm at 15 mK in a 1 kHz bandwidth with our design.

Pelliccione, Matthew; Bartel, John; Keller, Andrew; Goldhaber-Gordon, David

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "differential scanning calorimetry" 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

Higher Order Differential Attack of Camellia (II)  

Science Conference Proceedings (OSTI)

Camellia is a 128-bit block cipher, proposed by NTT and Mitsubishi in 2000. It has been shown that 10 round variant without FL function under a 256-bit secret key is attackable by Higher Order Differential Attack and even if FL function is included, ...

Yasuo Hatano; Hiroki Sekine; Toshinobu Kaneko

2002-08-01T23:59:59.000Z

242

Modeling the mental differentiation task with EEG  

Science Conference Proceedings (OSTI)

Differentiation in human beings is the act of perceiving the difference in or between objects. In other words, it is the mental process taking place to discriminate one thing from others, a common task performed by a person on a very regular basis. Making ... Keywords: BCI, EEG, artifical neural network, biosignal processing, differencitation tasks

Tan Vo; Tom Gedeon; Dat Tran

2012-11-01T23:59:59.000Z

243

Differential coefficients of orthogonal matrix polynomials  

Science Conference Proceedings (OSTI)

We find explicit formulas for raising and lowering first order differential operators for orthogonal matrix polynomials. We derive recurrence relations for the coefficients in the raising and lowering operators. Some examples are given. Keywords: Annihilation operators, Creation operators, Orthogonal matrix polynomials, primary 33E30, secondary 42C05

Antonio J. Duran; Mourad E. H. Ismail

2006-06-01T23:59:59.000Z

244

Fundamental solutions of homogeneous elliptic differential operators  

E-Print Network (OSTI)

We compute fundamental solutions of homogeneous elliptic differential operators, with constant coefficients, on $\\mathbb{R}^n$ by mean of analytic continuation of distributions. The result obtained is valid in any dimension, for any degree and can be extended to pseudodifferential operators of the same type.

Brice Camus

2005-10-31T23:59:59.000Z

245

Hydromagnetic Instability in Differentially Rotating Flows  

E-Print Network (OSTI)

We study the stability of a compressible differentially rotating flows in the presence of the magnetic field, and we show that the compressibility profoundly alters the previous results for a magnetized incompressible flow. The necessary condition of newly found instability can be easily satisfied in various flows in laboratory and astrophysical conditions and reads $B_{s} B_{\\phi} \\Omega' \

Bonanno, A

2006-01-01T23:59:59.000Z

246

The Transfer Function of a Differential Microbarometer  

Science Conference Proceedings (OSTI)

A differential microbarometer allowing the measurement of atmospheric pressure fluctuations with periods from 5 s to 18 h and resolution from 0,2 to 2.0 Pa is described. Experimental results of its calibration are in good agreement with acoustic ...

R. Richiardone

1993-08-01T23:59:59.000Z

247

V-078: WordPress Bugs Permit Cross-Site Scripting and Port Scanning Attacks  

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

8: WordPress Bugs Permit Cross-Site Scripting and Port Scanning 8: WordPress Bugs Permit Cross-Site Scripting and Port Scanning Attacks V-078: WordPress Bugs Permit Cross-Site Scripting and Port Scanning Attacks January 28, 2013 - 12:32am Addthis PROBLEM: WordPress Bugs Permit Cross-Site Scripting and Port Scanning Attacks PLATFORM: WordPress all versions are affected prior to 3.5.1 ABSTRACT: WordPress 3.5.1 Maintenance and Security Release REFERENCE LINKS: WordPress News SecurityTracker Alert ID: 1028045 Secunia Advisory SA51967 IMPACT ASSESSMENT: Medium DISCUSSION: Several scripts do not properly filter HTML code from user-supplied input before displaying the input. A remote user can cause arbitrary scripting code to be executed by the target user's browser. The code will originate from the site running the WordPress software and will run in the security

248

Airborne Scanning Spectrometer for Remote Sensing of Cloud, Aerosol, Water Vapor, and Surface Properties  

Science Conference Proceedings (OSTI)

An airborne scanning spectrometer was developed for measuring reflected solar and emitted thermal radiation in 50 narrowband channels between 0.55 and 14.2 µm. The instrument provides multispectral images of outgoing radiation for purposes of ...

Michael D. King; W. Paul Menzel; Patrick S. Grant; Jeffrey S. Myers; G. Thomas Arnold; Steven E. Platnick; Liam E. Gumley; Si-Chee Tsay; Christopher C. Moeller; Michael Fitzgerald; Kenneth S. Brown; Fred G. Osterwisch

1996-08-01T23:59:59.000Z

249

Low cost power and supply noise estimation and control in scan testing of vlsi circuits  

Science Conference Proceedings (OSTI)

Test power is an important issue in deep submicron semiconductor testing. Too much power supply noise and too much power dissipation can result in excessive temperature rise, both leading to overkill during delay test. Scan-based test has ...

Zhongwei Jiang / Duncan Walker

2010-01-01T23:59:59.000Z

250

Range–Height Scans of Lidar Depolarization for Characterizing Properties and Phase of Clouds and Precipitation  

Science Conference Proceedings (OSTI)

Backscatter and depolarization lidar measurements from clouds and precipitation are reported as functions of the elevation angle of the pointing lidar direction. The data were recorded by scanning the lidar beam (Nd:YAG) at a constant angular ...

Luc R. Bissonnette; Gilles Roy; Frédéric Fabry

2001-09-01T23:59:59.000Z

251

Spectrometer for Sky-Scanning Sun-Tracking Atmospheric Research (4STAR): Instrument Technology  

SciTech Connect

The Spectrometer for Sky-Scanning, Sun-Tracking Atmospheric Research (4STAR) combines airborne sun tracking and sky scanning with diffraction spectroscopy, to improve knowledge of atmospheric constituents and their links to air-pollution/climate. Direct beam hyper-spectral measurement of optical depth improves retrievals of gas constituents and determination of aerosol properties. Sky scanning enhances retrievals of aerosol type and size distribution. 4STAR measurements will tighten the closure between satellite and ground-based measurements. 4STAR incorporates a modular sun-tracking/ sky-scanning optical head with fiber optic signal transmission to rack mounted spectrometers, permitting miniaturization of the external optical head, and future detector evolution. Technical challenges include compact optical collector design, radiometric dynamic range and stability, and broad spectral coverage. Test results establishing the performance of the instrument against the full range of operational requirements are presented, along with calibration, engineering flight test, and scientific field campaign data and results.

Dunagan, Stephen; Johnson, Roy; Zavaleta, Jhony; Russell, P. B.; Schmid, Beat; Flynn, Connor J.; Redemann, Jens; Shinozuka, Yohei; Livingston, J.; Segal Rozenhaimer, Michal

2013-08-06T23:59:59.000Z

252

Variational Analysis for Airborne Conically Scanned Doppler Lidar to Retrieve Mesoscale Wind Fields  

Science Conference Proceedings (OSTI)

An airborne pulsed Doppler lidar implementing a downlooking conical scan rotating around the vertical axis is under development. The information contained in the measured radial velocities is studied to assess the capacity to retrieve the 3D wind ...

Alain Dabas; Julie Périn; Pierre H. Flamant

1997-10-01T23:59:59.000Z

253

Horizon scanning and the business environment --- the implications for risk management  

Science Conference Proceedings (OSTI)

'Uncertainty creates winners and losers. Organisations that want to survive have to adapt.' Kees van der Heijden, Professor of General and Strategic Management at the Graduate Business School of Strathclyde University, Glasgow [1].Horizon scanning is ...

D. Brown

2007-01-01T23:59:59.000Z

254

Wind Speed Effects on Sea Surface Emission and Reflection for the Along Track Scanning Radiometer  

Science Conference Proceedings (OSTI)

The emission and reflection properties of a rough sea surface are investigated, with particular emphasis on the wavelengths and viewing geometry relevant to the Along Track Scanning Radiometer. The authors start from Fresnel's equations for a ...

Philip D. Watts; Myles R. Allen; Timothy J. Nightingale

1996-02-01T23:59:59.000Z

255

Resolution and Accuracy of an Airborne Scanning Laser System for Beach Surveys  

Science Conference Proceedings (OSTI)

Airborne scanning laser technology provides an effective method to systematically survey surface topography and changes in that topography with time. In this paper the authors describe the capability of a rapid-response lidar system in which ...

J. H. Middleton; C. G. Cooke; E. T. Kearney; P. J. Mumford; M. A. Mole; G. J. Nippard; C. Rizos; K. D. Splinter; I. L. Turner

256

PWR Activity Transport and Source Term Assessment: Surface Activity Concentrations by Gamma Scanning  

Science Conference Proceedings (OSTI)

Measurement of surface isotopic concentrations, known as gamma scanning in the United States, is an invaluable tool in assessing variations in shutdown dose rates and the impacts of chemistry and operational changes.

2011-07-25T23:59:59.000Z

257

Multiwavelength Scanning Radiometer for Airborne Measurements of Scattered Radiation within Clouds  

Science Conference Proceedings (OSTI)

A multi-wavelength scanning radiometer has been developed for measuring the angular distribution of scattered radiation deep within a cloud layer. The purpose of the instrument is to provide measurements from which the single scattering albedo of ...

Michael D. King; Maxwell G. Strange; Peter Leone; Lamdin R. Blaine

1986-09-01T23:59:59.000Z

258

An evaluation of airborne laser scan data for coalmine subsidence mapping  

Science Conference Proceedings (OSTI)

The accurate mapping of coalmine subsidence is necessary for the continued management of potential subsidence impacts. The use of airborne laser scan (ALS) data for subsidence mapping provides an alternative method to traditional ground-based approaches ...

D. R. Palamara; M. Nicholson; P. Flentje; E. Baafi; G. M. Brassington

2007-07-01T23:59:59.000Z

259

A Multipurpose Scanning Spectral Polarimeter (SSP): Instrument Description and Sample Results  

Science Conference Proceedings (OSTI)

This paper describes the design and characteristics of a scanning spectral polarimeter designed to measure spectral radiances and fluxes in the range between 0.4 and 4.0 ?m. The instrument characteristics are described, and the procedures to ...

Graeme L. Stephens; Robert F. McCoy Jr.; Renata B. McCoy; Philip Gabriel; Philip T. Partain; Steven D. Miller; Steven P. Love

2000-05-01T23:59:59.000Z

260

Atomic-Scale Chemical Imaging via Combination of Scanning Tunneling and Electron Energy Loss Spectroscopies  

E-Print Network (OSTI)

Atomic-Scale Chemical Imaging via Combination of Scanning Tunneling and Electron Energy Loss visualization of chemical reaction pathways to provide mechanistic understanding for catalytically important systems at atomic level Develop atomically resolved chemical imaging platform via combination of low

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


261

Ultra-high precision scanning beam interference lithography and its application : spatial frequency multiplication  

E-Print Network (OSTI)

Scanning beam interference lithography (SBIL) is a technique developed at MIT in 2003. The SBIL system, referred to as the Nanoruler, could fabricate grating patterns with around ten-nanometer phase repeatability. There ...

Zhao, Yong, 1980-

2008-01-01T23:59:59.000Z

262

Monitoring the Reflectivity Calibration of a Scanning Radar Using a Profiling Radar and a Disdrometer  

Science Conference Proceedings (OSTI)

This paper describes a method of absolutely calibrating and routinely monitoring the reflectivity calibration from a scanning weather radar using a vertically profiling radar that has been absolutely calibrated using a collocated surface ...

Christopher R. Williams; Kenneth S. Gage; Wallace Clark; Paul Kucera

2005-07-01T23:59:59.000Z

263

Directional Wavelet Analysis of Inhomogeneity in the Surface Wave Field from Aerial Laser Scanning Data  

Science Conference Proceedings (OSTI)

Modern measurement techniques such as aerial laser scanning allow for rapid determination of the spatial variation of sea surface elevation. Wave fields obtained from such data show spatial inhomogeneity associated with the presence of wave ...

Richard M. Gorman; D. Murray Hicks

2005-06-01T23:59:59.000Z

264

A High Speed Spectrally Scanning Radiometer (SPERAD) for Airborne Measurements of Cloud Optical Properties  

Science Conference Proceedings (OSTI)

The overall design of a radiometer and data acquisition system for use on an aircraft platform is described. The instrument is a fast response spectrally scanning radiometer providing measurements at 48 spectral intervals between 400 and 1200 nm. ...

Graeme L. Stephens; John C. Scott

1985-06-01T23:59:59.000Z

265

Comparison of control algorithms for a MEMS-based adaptive optics scanning laser ophthalmoscope  

Science Conference Proceedings (OSTI)

We compared four algorithms for controlling a MEMS deformable mirror of an adaptive optics (AO) scanning laser ophthalmoscope. Interferometer measurements of the static nonlinear response of the deformable mirror were used to form an equivalent linear ...

Kaccie Y. Li; Sandipan Mishra; Pavan Tiruveedhula; Austin Roorda

2009-06-01T23:59:59.000Z

266

Numerical Filtering of Spurious Transients in a Satellite Scanning Radiometer: Application to CERES  

Science Conference Proceedings (OSTI)

The Clouds and Earth Radiant Energy System (CERES) scanning radiometer was designed to provide high accuracy measurements of the radiances from the earth. Calibration testing of the instruments showed the presence of an undesired slow transient ...

G. Louis Smith; D. K. Pandey; Robert B. Lee III; Bruce R. Barkstrom; Kory J. Priestley

2002-02-01T23:59:59.000Z

267

Former Worker Program - Low-Dose Spiral CT Scans for Early Lung...  

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

of radiation emitted during CT scans. Chest CT, in general, requires less radiation exposure than other CT procedures because the air-filled tissues of the lungs are not as dense...

268

Resolution and Accuracy of an Airborne Scanning Laser System for Beach Surveys  

Science Conference Proceedings (OSTI)

Airborne scanning laser technology provides an effective method to systematically survey surface topography and changes in that topography with time. In this paper, the authors describe the capability of a rapid-response lidar system in which ...

J. H. Middleton; C. G. Cooke; E. T. Kearney; P. J. Mumford; M. A. Mole; G. J. Nippard; C. Rizos; K. D. Splinter; I. L. Turner

2013-10-01T23:59:59.000Z

269

Correlations between Nimbus-7 Scanning Multichannel Microwave Radiometer Data and an Antecedent Precipitation Index  

Science Conference Proceedings (OSTI)

Passive microwave brightness temperatures from the Nimbus-7 Scanning Multichannel Microwave Radiometer (SMMR) can be used to infer the soil moisture content over agricultural areas such as the southern Great Plains of the United States. A linear ...

Gregory D. Wilke; Marshall J. McFarland

1986-02-01T23:59:59.000Z

270

A novel white-light scanning interferometer for absolute nano-scale gap thickness measurement  

E-Print Network (OSTI)

This paper presents a special configuration of white-light scanning interferometer, in which the measured gap is not located in any interference arm of the interferometer, but acts as an amplitude-and-phase modulator of ...

Xu, Zhiguang

271

White-light scanning interferometer for absolute nano-scale gap thickness measurement  

E-Print Network (OSTI)

A special configuration of white-light scanning interferometer is described for measuring the absolute air gap thickness between two planar plates brought into close proximity. The measured gap is not located in any ...

Xu, Zhiguang

272

The Development of a Scanning Raman Water Vapor Lidar for Boundary Layer and Tropospheric Observations  

Science Conference Proceedings (OSTI)

A scanning, ultraviolet, Raman water vapor lidar designed primarily for boundary layer measurements has been built and operated by the Los Alamos National Laboratory Ground-Based Earth Observing Network team. The system provides high temporal and ...

W. E. Eichinger; D. I. Cooper; P. R. Forman; J. Griegos; M. A. Osborn; D. Richter; L. L. Tellier; R. Thornton

1999-11-01T23:59:59.000Z

273

Asesssment of mobile gamma-scanning van activities in Edgemont, South Dakota. [UMTRA program  

SciTech Connect

All accessible thoroughfares in an area in Edgemont, South Dakota, comprising approximately 800 properties, were traversed by a mobile gamma-ray scanning van operated by Oak Ridge National Laboratory (ORNL). The purpose of the mobile survey was to identify residual radioactive contamination on properties in the vicinity of the nearby uranium tailings pile. The properties identified by mobile scanning (herein referred to as anomalies) were compared with results from walk-on measurements conducted by Battelle Pacific Northwest Laboratories (PNL). The mobile scan was successful in identifying 48% of the properties previously identified as contaminated by PNL walk-on measurements. Modification of the algorithm used by the mobile scanning van to identify radioactive contamination from the measured gamma radiation resulted in mixed success; the number of successful identifications increased but the number of false identifications increased disproportionately and unacceptably.

1986-04-01T23:59:59.000Z

274

Measurements of neutron dose equivalent for a proton therapy center using uniform scanning proton beams  

SciTech Connect

Purpose: Neutron exposure is of concern in proton therapy, and varies with beam delivery technique, nozzle design, and treatment conditions. Uniform scanning is an emerging treatment technique in proton therapy, but neutron exposure for this technique has not been fully studied. The purpose of this study is to investigate the neutron dose equivalent per therapeutic dose, H/D, under various treatment conditions for uniform scanning beams employed at our proton therapy center. Methods: Using a wide energy neutron dose equivalent detector (SWENDI-II, ThermoScientific, MA), the authors measured H/D at 50 cm lateral to the isocenter as a function of proton range, modulation width, beam scanning area, collimated field size, and snout position. They also studied the influence of other factors on neutron dose equivalent, such as aperture material, the presence of a compensator, and measurement locations. They measured H/D for various treatment sites using patient-specific treatment parameters. Finally, they compared H/D values for various beam delivery techniques at various facilities under similar conditions. Results: H/D increased rapidly with proton range and modulation width, varying from about 0.2 mSv/Gy for a 5 cm range and 2 cm modulation width beam to 2.7 mSv/Gy for a 30 cm range and 30 cm modulation width beam when 18 Multiplication-Sign 18 cm{sup 2} uniform scanning beams were used. H/D increased linearly with the beam scanning area, and decreased slowly with aperture size and snout retraction. The presence of a compensator reduced the H/D slightly compared with that without a compensator present. Aperture material and compensator material also have an influence on neutron dose equivalent, but the influence is relatively small. H/D varied from about 0.5 mSv/Gy for a brain tumor treatment to about 3.5 mSv/Gy for a pelvic case. Conclusions: This study presents H/D as a function of various treatment parameters for uniform scanning proton beams. For similar treatment conditions, the H/D value per uncollimated beam size for uniform scanning beams was slightly lower than that from a passive scattering beam and higher than that from a pencil beam scanning beam, within a factor of 2. Minimizing beam scanning area could effectively reduce neutron dose equivalent for uniform scanning beams, down to the level close to pencil beam scanning.

Zheng Yuanshui; Liu Yaxi; Zeidan, Omar; Schreuder, Andries Niek; Keole, Sameer [ProCure Proton Therapy Center, 5901 West Memorial Road, Oklahoma City, Oklahoma 73142 (United States); INTEGRIS Cancer Insititute, 5911 West Memorial Road, Oklahoma City, Oklahoma 73142 (United States); ProCure Proton Therapy Center, 5901 West Memorial Road, Oklahoma City, Oklahoma 73142 (United States); ProCure Treatment Centers, 420 North Walnut Street, Bloomington, Indiana 47404 (United States); ProCure Proton Therapy Center, 5901 West Memorial Road, Oklahoma City, Oklahoma 73142 (United States)

2012-06-15T23:59:59.000Z

275

A frequency scanning method for the identification of harmonic instabilities in HVDC systems  

SciTech Connect

A Frequency Scanning Method is introduced in the paper to obtain a more accurate frequency characteristic for identifying harmonic instability in HVdc systems. An example of the application is used to identify the resonance frequencies in the CIGRE benchmark model. The paper shows that the Benchmark model is not tuned to the resonance frequency that it was designed for. Using the scanning method, the resonance frequency of the benchmark model may be shifted to demonstrate a simulation of core-saturation type instability.

Jiang, X.; Gole, A.M. [Univ. of Manitoba, Winnipeg, Manitoba (Canada). Dept. of Electrical and Computer Engineering

1995-10-01T23:59:59.000Z

276

High-Definition Differential Ion Mobility Spectrometry with Resolving Power up to 500  

Science Conference Proceedings (OSTI)

As the resolution of analytical methods improve, further progress tends to be increasingly limited by instrumental parameter instabilities that could be ignored before. This is now the case with differential ion mobility spectrometry (FAIMS), where fluctuations of the voltages and gas pressure have become critical. A new high-definition generator for FAIMS compensation voltage reported here provides a stable and accurate output than can be scanned with negligible steps. This reduces the spectral drift and peak width, thus improving the resolving power (R) and resolution. The gain for multiply-charged peptides that have narrowest peaks is up to ~40%, and R ~ 400 - 500 is achievable using He/N2 or H2/N2 gas mixtures.

Shvartsburg, Alexandre A.; Seim, Thomas A.; Danielson, William F.; Norheim, Randolph V.; Moore, Ronald J.; Anderson, Gordon A.; Smith, Richard D.

2013-01-20T23:59:59.000Z

277

High Bandwidth Differential Amplifier for Shock Experiments  

Science Conference Proceedings (OSTI)

We developed a high bandwidth differential amplifier for gas gun shock experiments. The circuit has a bandwidth up to 1 GHz, and is capable of measuring signals of ?1.5 V with a common mode rejection of 250 V. Conductivity measurements of gas gun targets are measured by flowing high currents through the targets. The voltage is measured across the target using a technique similar to a four-point probe. Because of the design of the current source and load, the target voltage is approximately 250 V relative to ground. Since the expected voltage change in the target is < 1 V, the differential amplifier must have a large common mode rejection. Various amplifying designs are shown, although the increased amplification decreases bandwidth. Bench tests show that the amplifier can withstand significant common mode DC voltage and measure 10 ns, and 50 mV signals.

Ross, P., Tran, V., Chau, R.

2012-10-01T23:59:59.000Z

278

High Bandwidth Differential Amplifier for Shock Experiments  

Science Conference Proceedings (OSTI)

We developed a high bandwidth differential amplifier for gas gun shock experiments/applications. The circuit has a bandwidth > 1 GHz, and is capable of measuring signals of ?1.5 V with a common mode rejection of 250 V. Conductivity measurements of gas gun targets are measured by flowing high currents through the targets. The voltage is measured across the target using a technique similar to a four-point probe. Because of the design of the current source and load, the target voltage is approximately 250 V relative to ground. Since the expected voltage change in the target is < 1 V, the differential amplifier must have a large common mode rejection. High pass filters suppress internal ringing of operational amplifiers. Results of bench tests are shown.

Ross, P. W., Tran, V., Chau, R.

2012-04-30T23:59:59.000Z

279

article  

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

Pseudo isothermal ice crystallization kinetics in the gas diffusion Pseudo isothermal ice crystallization kinetics in the gas diffusion layer of a fuel cell from differential scanning calorimetry journal International Journal of Heat and Mass Transfer volume year month pages abstract p Non isothermal ice crystallization kinetics in the fibrous gas diffusion layer GDL of a proton exchange membrane fuel cell is investigated using differential scanning calorimetry DSC Non isothermal ice crystallization rates and ice crystallization temperatures are obtained from heat flow measurements in a water saturated commercial GDL at cooling rates of and K min Our previously developed isothermal ice crystallization rate expression is extended to non isothermal crystallization to predict ice crystallization kinetics in a GDL at various cooling

280

Applications of automatic differentiation in CFD  

DOE Green Energy (OSTI)

Automated multidisciplinary design of aircraft requires the optimization of complex performance objectives with respect to a number of design parameters and constraints. The effect of these independent design variables on the system performance criteria can be quantified in terms of sensitivity derivatives for the individual discipline simulation codes. Typical advanced CFD codes do not provide such derivatives as part of a flow solution. These derivatives are expensive to obtain by divided differences from perturbed solutions, and may be unreliable, particularly for noisy functions. In this paper, automatic differentiation has been investigated as a means of extending iterative CFD codes with sensitivity derivatives. In particular, the ADIFOR automatic differentiator has been applied to the 3-D, thin-layer Navier-Stokes, multigrid flow solver called TLNS3D coupled with the WTCO wing grid generator. Results of a sequence of efforts in which TLNS3D has been successfully augmented to compute a variety of sensitivities are presented. It is shown that sensitivity derivatives can be obtained accurately and efficiently using ADIFOR, although significant advances are necessary for the efficiency of ADIFOR-generated derivative code to become truly competitive with hand-differentiated code.

Carle, A. [Rice Univ., Houston, TX (United States); Green, L.L.; Newman, P.A. [National Aeronautics and Space Administration, Hampton, VA (United States). Langley Research Center; Bischof, C.H. [Argonne National Lab., IL (United States)

1994-06-01T23:59:59.000Z

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


281

Assessment of Rainfall Measurement That Uses Specific Differential Phase  

Science Conference Proceedings (OSTI)

This paper examines some effects of drop size distribution and shape on the rainfall-rate estimates obtained from the specific differential phase. An algorithm that uses exclusively the specific differential phase is presented, and performance of ...

Alexander Ryzhkov; Dusan Zrni?

1996-11-01T23:59:59.000Z

282

Transcriptional regulatory network for sexual differentiation in fission yeast  

E-Print Network (OSTI)

Abstract Background Changes in gene expression are hallmarks of cellular differentiation. Sexual differentiation in fission yeast (Schizosaccharomyces pombe) provides a model system for gene expression programs accompanying and driving cellular...

Mata, Juan; Wilbrey, Anna; Bahler, Jurg

2007-10-10T23:59:59.000Z

283

The Differential Phase Pattern of the CSU CHILL Radar Antenna  

Science Conference Proceedings (OSTI)

The measurement of the differential propagation phase and copolar correlation coefficient are affected by the differential phase pattern of the antenna system when operating in an alternate horizontal and vertical transmitting scheme. Direct ...

A. Mudukutore; V. Chandrasekar; E. A. Mueller

1995-10-01T23:59:59.000Z

284

Low-dose computed tomography image restoration using previous normal-dose scan  

Science Conference Proceedings (OSTI)

Purpose: In current computed tomography (CT) examinations, the associated x-ray radiation dose is of a significant concern to patients and operators. A simple and cost-effective means to perform the examinations is to lower the milliampere-seconds (mAs) or kVp parameter (or delivering less x-ray energy to the body) as low as reasonably achievable in data acquisition. However, lowering the mAs parameter will unavoidably increase data noise and the noise would propagate into the CT image if no adequate noise control is applied during image reconstruction. Since a normal-dose high diagnostic CT image scanned previously may be available in some clinical applications, such as CT perfusion imaging and CT angiography (CTA), this paper presents an innovative way to utilize the normal-dose scan as a priori information to induce signal restoration of the current low-dose CT image series. Methods: Unlike conventional local operations on neighboring image voxels, nonlocal means (NLM) algorithm utilizes the redundancy of information across the whole image. This paper adapts the NLM to utilize the redundancy of information in the previous normal-dose scan and further exploits ways to optimize the nonlocal weights for low-dose image restoration in the NLM framework. The resulting algorithm is called the previous normal-dose scan induced nonlocal means (ndiNLM). Because of the optimized nature of nonlocal weights calculation, the ndiNLM algorithm does not depend heavily on image registration between the current low-dose and the previous normal-dose CT scans. Furthermore, the smoothing parameter involved in the ndiNLM algorithm can be adaptively estimated based on the image noise relationship between the current low-dose and the previous normal-dose scanning protocols. Results: Qualitative and quantitative evaluations were carried out on a physical phantom as well as clinical abdominal and brain perfusion CT scans in terms of accuracy and resolution properties. The gain by the use of the previous normal-dose scan via the presented ndiNLM algorithm is noticeable as compared to a similar approach without using the previous normal-dose scan. Conclusions: For low-dose CT image restoration, the presented ndiNLM method is robust in preserving the spatial resolution and identifying the low-contrast structure. The authors can draw the conclusion that the presented ndiNLM algorithm may be useful for some clinical applications such as in perfusion imaging, radiotherapy, tumor surveillance, etc.

Ma, Jianhua; Huang, Jing; Feng, Qianjin; Zhang, Hua; Lu, Hongbing; Liang, Zhengrong; Chen, Wufan [Department of Biomedical Engineering, Southern Medical University, Guangzhou, Guangdong 510515, China and Department of Radiology, State University of New York, Stony Brook, New York 11794 (United States); Department of Biomedical Engineering, Southern Medical University, Guangzhou, Guangdong 510515 (China); Department of Biomedical Engineering, Fourth Military Medical University, Xi'An, Shanxi 710032 (China); Department of Radiology, State University of New York, Stony Brook, New York 11794 (United States); Department of Biomedical Engineering, Southern Medical University, Guangzhou, Guangdong 510515 (China)

2011-10-15T23:59:59.000Z

285

U-007: IBM Rational AppScan Import/Load Function Flaws Let Remote Users  

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

7: IBM Rational AppScan Import/Load Function Flaws Let Remote 7: IBM Rational AppScan Import/Load Function Flaws Let Remote Users Execute Arbitrary Code U-007: IBM Rational AppScan Import/Load Function Flaws Let Remote Users Execute Arbitrary Code October 10, 2011 - 9:15am Addthis PROBLEM: IBM Rational AppScan Import/Load Function Flaws Let Remote Users Execute Arbitrary Code. PLATFORM: Version(s): 7.8, 7.8.0.1, 7.8.0.2, 7.9, 7.9.0.1, 7.9.0.2, 7.9.0.3, 8.0, 8.0.0.1, 8.0.0.2 ABSTRACT: Two vulnerabilities were reported in IBM Rational AppScan. A remote user can cause arbitrary code to be executed on the target user's system. reference LINKS: IBM Security Advisory Document ID: 1515110 IBM Fix Pack Document ID: 4030774 SecurityTracker Alert ID: 1026154 IMPACT ASSESSMENT: High Discussion: A high risk security vulnerability in the "Import functionality" of IBM

286

Effects of Pulse Duration on Bulk Laser Damage in 350-nm Raster-Scanned DKDP  

SciTech Connect

In this paper we present the results of bulk damage experiments done on Type-I1 DKDP triple harmonic generator crystals that were raster conditioned with 351-355 nm wavelengths and pulse durations of 4 and 23.2 ns. In the first phase of experiments 20 different scan protocols were rastered into a sample of rapid growth DKDP. The sample was then rastered at damage-causing fluences to determine the three most effective protocols. These three protocols were scanned into a 15-cm sample of conventional-growth DKDP and then exposed to single shots of a I-cm beam from LLNL's Optical Sciences Laser at fluences ranging from 0.5 - 1.5X of the 10% damage probability fluence and nominal pulse durations of 0.1,0.3,0.8,3.2,7.0 and 20 ns. The experiment showed that pulse durations in the 1-3 ns range were much more effective at conditioning than pulses in the 16.3 ns range and that the multiple pass 'peak fluence' scan was more effective than the single pass 'leading edge' scan for 23.2 ns XeF scans.

Runkel, M; Bruere, J; Sell, W; Weiland, T; Milam, D; Hahn, D E; Nostrand, M C

2002-10-30T23:59:59.000Z

287

Notes on Differential Geometry and Lie Groups Jean Gallier  

E-Print Network (OSTI)

will be well prepared to read standard differential geometry texts such as do Carmo [51], Gallot, Hulin

Gallier, Jean

288

Notes on Differential Geometry and Lie Groups Jean Gallier  

E-Print Network (OSTI)

will be well prepared to read standard differential geometry texts such as do Carmo [50], Gallot, Hulin

Gallier, Jean

289

The thermodynamic properties of thianthrene and phenoxathiin  

Science Conference Proceedings (OSTI)

Measurements leading to the calculation of the ideal-gas thermodynamic properties are reported for thianthrene (Chemical Abstracts registry number [92-85-3]) and phenoxathiin (registry number [262-20-41]). Experimental methods included combustion calorimetry, adiabatic heat-capacity calorimetry, vibrating-tube densitometry, comparative ebulliometry, inclined-piston gauge manometry, and differential-scanning calorimetry (d.s.c.). Critical properties were estimated for both materials based on the measurement results. Entropies, enthalpies, and Gibbs energies of formation were derived for the ideal gas for both compounds for selected temperatures between 298.15 K and 700 K. The property-measurement results reported here for thianthrene and phenoxathiin provide the first experimental gas-phase Gibbs energies of formation for tricyclic diheteroatom-containing molecules.

Steele, W.V.; Chirico, R.D.; Knipmeyer, S.E.; Nguyen, A.

1993-04-01T23:59:59.000Z

290

Pseudo-isothermal ice-crystallization kinetics in the gas-diffusion layer  

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

Pseudo-isothermal ice-crystallization kinetics in the gas-diffusion layer Pseudo-isothermal ice-crystallization kinetics in the gas-diffusion layer of a fuel cell from differential scanning calorimetry Title Pseudo-isothermal ice-crystallization kinetics in the gas-diffusion layer of a fuel cell from differential scanning calorimetry Publication Type Journal Article Year of Publication 2013 Authors Dursch, Thomas J., Monica A. Ciontea, Gregory J. Trigub, Clayton J. Radke, and Adam Z. Weber Journal International Journal of Heat and Mass Transfer Volume 60 Pagination 450 - 458 Date Published 5/2013 ISSN 00179310 Keywords crystallization, differential scanning calorimetry, gas-diffusion layer, Heat Transfer, kinetics, melt, nonisothermal crystallization, nucleation, polyesters, polymer crystallization, solidification Abstract Non-isothermal ice-crystallization kinetics in the fibrous gas-diffusion layer (GDL) of a proton-exchange-membrane fuel cell is investigated using differential scanning calorimetry (DSC). Non-isothermal ice-crystallization rates and ice-crystallization temperatures are obtained from heat-flow measurements in a water-saturated commercial GDL at cooling rates of 2.5, 5, 10, and 25 K/min. Our previously developed isothermal ice-crystallization rate expression is extended to non-isothermal crystallization to predict ice-crystallization kinetics in a GDL at various cooling rates. Agreement between DSC experimental results and theory is good. Both show that as the cooling rate increases, ice-crystallization rates increase and crystallization temperatures decrease monotonically. Importantly, we find that the cooling rate during crystallization has a negligible effect on the crystallization rate when crystallization times are much faster than the time to decrease the sample temperature by the subcooling. Based on this finding, we propose a pseudo-isothermal method for obtaining non-isothermal crystallization kinetics using isothermal crystallization kinetics evaluated at the non-isothermal crystallization temperature.

291

Stability of Partial Functional Integro-Differential Equations  

Science Conference Proceedings (OSTI)

Using the Fourier method of separation of variables and a procedure proposed in this paper, namely, reducing integrodifferential equations to systems of ordinary differential equations, the exponential stability of partial functional integro-differential ... Keywords: Cauchy matrix, Functional differential equations, exponential stability, phase transition model

R. P. Agarwal; A. Domoshnitsky; Ya. Goltser

2006-01-01T23:59:59.000Z

292

California Policy Should Distinguish Biofuels by Differential Global Warming Effects  

E-Print Network (OSTI)

California Policy Should Distinguish Biofuels by Differential Global Warming Effects by Richard J: _______________________________________ Date #12;California Policy Should Distinguish Biofuels by Differential Global Warming Effects Richard J, 2006 #12;#12;ABSTRACT California Policy Should Distinguish Biofuels by Differential Global Warming

Kammen, Daniel M.

293

Building Blocks for Computer Vision with Stochastic Partial Differential Equations  

Science Conference Proceedings (OSTI)

We discuss the basic concepts of computer vision with stochastic partial differential equations (SPDEs). In typical approaches based on partial differential equations (PDEs), the end result in the best case is usually one value per pixel, the "expected" ... Keywords: Error propagation, Image processing, Polynomial chaos, Random fields, Stochastic Galerkin method, Stochastic finite element method, Stochastic partial differential equations

Tobias Preusser; Hanno Scharr; Kai Krajsek; Robert M. Kirby

2008-12-01T23:59:59.000Z

294

The Effect of Mean and Differential Attenuation on the Precision and Accuracy of the Estimates of Reflectivity and Differential Reflectivity  

Science Conference Proceedings (OSTI)

Error propagation analysis is applied to evaluate the effects of correcting horizontal and differential attenuation on the precision of the estimates of reflectivity and differential reflectivity. The analysis shows that the loss of precision on ...

Enrico Torlaschi; Isztar Zawadzki

2003-03-01T23:59:59.000Z

295

Application of scanning mid-IR-laser microscopy for characterization of semiconductor materials for photovoltaics  

E-Print Network (OSTI)

The scanning mid-IR-laser microscopy was previously demonstrated as an effective tool for characterization of different semiconductor crystals. Now the technique has been successfully applied for the investigation of CZ SixGe1-x -- a promising material for photovoltaics - and multicrystalline silicon for solar cells. In addition, this technique was shown to be appropriate for imaging of polishing-induced defects as well as such huge defects as "pin holes". Besides, previously unexplained "anomalous" (cubic power) dependence of signal of the scanning mid-IR-laser microscope in the optical-beam-induced light scattering mode on the photoexcitation power obtained for mechanically polished samples has now been attributed to the excess carrier scattering on charged linear defects, likely dislocation lines. The conclusion is made in the article that the scanning mid-IR-laser microscopy may serve as very effective tool for defect investigations in materials for modern photovoltaics.

Kalinushkin, V P; Yuryev, V A; 10.1016/S0927-0248(00)00076-3

2011-01-01T23:59:59.000Z

296

Method and apparatus for a high-resolution three dimensional confocal scanning transmission electron microscope  

DOE Patents (OSTI)

A confocal scanning transmission electron microscope which includes an electron illumination device providing an incident electron beam propagating in a direction defining a propagation axis, and a precision specimen scanning stage positioned along the propagation axis and movable in at least one direction transverse to the propagation axis. The precision specimen scanning stage is configured for positioning a specimen relative to the incident electron beam. A projector lens receives a transmitted electron beam transmitted through at least part of the specimen and focuses this transmitted beam onto an image plane, where the transmitted beam results from the specimen being illuminated by the incident electron beam. A detection system is placed approximately in the image plane.

de Jonge, Niels (Oak Ridge, TN)

2010-08-17T23:59:59.000Z

297

NETL-RUA Scans for Improved Enhanced Oil Recovery Technique | Department of  

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

Scans for Improved Enhanced Oil Recovery Technique Scans for Improved Enhanced Oil Recovery Technique NETL-RUA Scans for Improved Enhanced Oil Recovery Technique April 4, 2012 - 1:00pm Addthis Washington, DC - Researchers participating in the National Energy Technology Laboratory Regional University Alliance (NETL-RUA) are using a familiar piece of medical equipment - a CT scanner - to evaluate cutting-edge improvements to enhanced oil recovery (EOR) techniques. Results from these studies could be used to help increase domestic oil supplies from EOR while helping to reduce the amount of carbon dioxide (CO2) emitted to the atmosphere. Scientists from the University of Pittsburgh, University of Bristol, Rutherford Appleton Laboratory, URS, and NETL are using the scanner and surfactants (fluids added to injected CO2 that change its flow properties)

298

Scanned Document  

Office of Legacy Management (LM)

EPA-402-R-04-006 EPA-402-R-04-006 Environmental Protection Indoor Air November 2004 Agency Washington, DC 20460 Annual Water Sampling and Analysis, Calendar Year 2004: SHOAL Test Site Area FAULTLESS Test Site Area RULISON Test Site Area RIO BLANCO Test Site Area GASBUGGY Test Site Area GNOME Test Site Area Annual Water Sampling and Analysis, Calendar Year 2004 SHOAL Test Site Area FAULTLESS Test Site Area RULISON Test Site Area RIO BLANCO Test Site Area GASBUGGY Test Site Area GNOME Test Site Area Max G. Davis Rose (Kitty) Houston Prepared for the U.S. Department of Energy under Interagency Agreement DE-AI08-96NV 1 1969 RADIATION AND INDOOR ENVIRONMENTS NATIONAL LABORATORY OFFICE OF RADIATION AND INDOOR AIR U.S. ENVIRONMENTAL PROTECTION AGENCY P.O. BOX 98517

299

Scanned NTS  

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

Transfer of Excess Personal Property Transfer of Excess Personal Property From the Nevada Test Site to the Community Reuse Organization DOE/IG-0589 March 2003 Transfer of Property to the Community Reuse Organization Details of Finding ........................................................................1 Recommendations and Comments .............................................4 Appendices 1. Guidance on Disposition of Excess Personal Property ..........5 2. Management Comments ........................................................9 3. Objective, Scope, and Methodology ....................................11 TRANSFER OF EXCESS PERSONAL PROPERTY FROM THE NEVADA TEST SITE TO THE COMMUNITY REUSE ORGANIZATION TABLE OF CONTENTS Page 1 Transfer of Excess Personal Property

300

scan archives  

Science Conference Proceedings (OSTI)

... June 29, 2012 - A Pipeline and Hazardous Materials Safety Administration (PHMSA) Section 24 Public Workshop, addressing the legislative ...

2013-01-11T23:59:59.000Z

Note: This page contains sample records for the topic "differential scanning calorimetry" 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

Partial scan flip flop selection for simulation-based sequential ATPGs  

E-Print Network (OSTI)

Abstract * The partial scan approach is now widely adopted and several commercial tools support this technique. However, there is no general agreement on how to select the Scan Flip Flops: in general each technique is tailored to a particular ATPG algorithm and results effective when coupled with the right ATPG tool. In this paper, we propose an approach suitable for GAbased ATPGs, which is based on exploiting some information coming from the ATPG itself; we compare the results of our method with the ones of the approach based on cutting the topological loops and use a GAbased ATPG to demonstrate its effectiveness in terms of Fault Coverage and CPU time. 1.

Fulvio Corno; Paolo Prinetto; Maurizio Rebaudengo; Matteo Sonza Reorda

1996-01-01T23:59:59.000Z

302

Partial Scan Flip Flop Selection for Simulation-Based Sequential ATPGs  

E-Print Network (OSTI)

* The partial scan approach is now widely adopted and several commercial tools support this technique. However, there is no general agreement on how to select the Scan Flip Flops: in general each technique is tailored to a particular ATPG algorithm and results effective when coupled with the right ATPG tool. In this paper, we propose an approach suitable for GAbased ATPGs, which is based on exploiting some information coming from the ATPG itself; we compare the results of our method with the ones of the approach based on cutting the topological loops and use a GAbased ATPG to demonstrate its effectiveness in terms of Fault Coverage and CPU time. 1.

Fulvio Corno Paolo; Paolo Prinetto; Maurizio Rebaudengo; Matteo Sonza Reorda

1996-01-01T23:59:59.000Z

303

X-band Scanning ARM Precipitation Radar (X-SAPR) Instrument Handbook  

SciTech Connect

The X-band scanning ARM cloud radar (X-SAPR) is a full-hemispherical scanning polarimetric Doppler radar transmitting simultaneously in both H and V polarizations. With a 200 kW magnetron transmitter, this puts 100 kW of transmitted power for each polarization. The receiver for the X-SAPR is a Vaisala Sigmet RVP-900 operating in a coherent-on-receive mode. Three X-SAPRs are deployed around the Southern Great Plains (SGP) Central Facility in a triangular array. A fourth X-SAPR is deployed near Barrow, Alaska on top of the Barrow Arctic Research Center.

Widener, K; Bharadwaj, N

2012-10-29T23:59:59.000Z

304

ScanningTunneling Luminescence of Grain Boundaries in Cu(In,Ga)Se2  

DOE Green Energy (OSTI)

At the Laboratory, photon emission in semiconductors has been mapped in the nanoscale using scanning tunneling microscopy (STM). In this Solar Program Review Meeting, we report on the latest results obtained in Cu(In,Ga)Se2 (CIGS) thin films by this adapted STM. Scanning tunneling luminescence (STL) spectroscopy suggests that photons are emitted near the surface of CIGS. STL is excited either by (1) diffusion of tunneling electrons and subsequent recombination with available holes in CIGS or (2) impact ionization by hot electrons. Which process becomes predominant depends on the voltage applied to the STM tip. Photon mapping shows electronically active, extended defects near the surface of CIGS thin films.

Romero, M. J.; Jiang, C.-S.; Al-Jassim, M. M.; Noufi, R.

2005-01-01T23:59:59.000Z

305

Extending PVSCAN to meet the market needs for high-speed, large-area scanning  

DOE Green Energy (OSTI)

PVSCAN is a versatile instrument that has many applications in the PV industry, including high-speed mapping of material and cell parameters such as defect density, reflectance, and LBIC response. Recently, the PV community has been interested in acquiring this instrument for material and cell analyses and for process monitoring. This paper explores various issues that arise in developing a commercial instrument such as PVSCAN. Emphasis is on the technical details of the ability to scan fast and the detrimental effects this fast scan can have on the image quality of various material/cell parameters.

Sopori, B.; Chen, W.; Zhang, Y.; Hemschoot, T.; Madjdpour, J.

1999-10-26T23:59:59.000Z

306

Single Defect Center Scanning Near-Field Optical Microscopy on Graphene  

E-Print Network (OSTI)

We demonstrate high resolution scanning fluorescence resonance energy transfer 10 microscopy between a single nitrogen-vacancy center as donor and graphene as acceptor. 11 Images with few nanometer resolution of single and multilayer graphene structures were 12 attained. An energy transfer efficiency of 30% at distances of 10nm between a single 13 defect and graphene was measured. Further the energy transfer distance dependence of 14 the nitrogen-vacancy center to graphene was measured to show the predicted d-4 15 dependence. Our studies pave the way towards a diamond defect center based versatile 16 single emitter scanning microscope.

J. Tisler; T. Oeckinghaus; R. Stöhr; R. Kolesov; F. Reinhard; J. Wrachtrup

2013-01-02T23:59:59.000Z

307

Backlund Transformations for Darboux Integrable Differential Systems  

E-Print Network (OSTI)

We give a new mechanism for constructing Backlund transformations by using symmetry reduction of differential systems. We then characterize a family of Backlund transformations between Darboux integrable systems where the Backlund transformation can be constructed by the proposed symmetry reduction method. It is then shown that the well-known Backlund transformations between Darboux integrable Monge-Ampere systems can all be constructed using group quotients. A simple group theoretical argument leads to a non-existence result for Backlund transformations which disagrees with Theorem 1 in arXiv:0707.4408v2. A variety of examples are given.

Anderson, Ian M

2011-01-01T23:59:59.000Z

308

DIFFERENTIAL OPERATORS IN CURVILINEAR COORDINATES5  

E-Print Network (OSTI)

DIFFERENTIAL OPERATORS IN CURVILINEAR COORDINATES5 Cylindrical Coordinates Divergence · A = 1 r r (rAr) + 1 r A + Az z Gradient ( f)r = f r ; ( f) = 1 r f ; ( f)z = f z Curl ( � A)r = 1 r Az - A z ( � A) = Ar z - Az r ( � A)z = 1 r r (rA) - 1 r Ar Laplacian 2 f = 1 r r r f r + 1 r2 2 f 2 + 2 f z2

Militzer, Burkhard

309

A NEW TEST METRIC AND A NEW SCAN ARCHITECTURE FOR EFFICIENT VLSI TESTING  

E-Print Network (OSTI)

A NEW TEST METRIC AND A NEW SCAN ARCHITECTURE FOR EFFICIENT VLSI TESTING A DISSERTATION SUBMITTED. To overcome the difficulty and cost of VLSI testing, we need to search for better testing techniques. Chip testing can be classified into two categories: production testing and characterization testing

Stanford University

310

Exploring Impacts of Rapid-Scan Radar Data on NWS Warning Decisions  

Science Conference Proceedings (OSTI)

Rapid-scan weather radars, such as the S-band phased array radar at the National Weather Radar Testbed in Norman, Oklahoma, improve precision in the depiction of severe storm processes. To explore potential impacts of such data on forecaster ...

Pamela L. Heinselman; Daphne S. LaDue; Heather Lazrus

2012-08-01T23:59:59.000Z

311

Scanning ARM Cloud Radars – Part II: Data Quality Control and Processing  

Science Conference Proceedings (OSTI)

The Scanning ARM Cloud Radars (SACR’s) are the primary instruments for documenting the four-dimensional structure and evolution of clouds within a 20-30 km radius from the ARM fixed and mobile sites. Here, the post-processing of the calibrated ...

Pavlos Kollias; Ieng Jo; Paloma Borque; Aleksandra Tatarevic; Katia Lamer; Nitin Bharadwaj; Kevin Widener; Karen Johnson; Eugene E. Clothiaux

312

Rapid Scan Views of Convectively Generated Mesovortices in Sheared Tropical Cyclone Gustav (2002)  

Science Conference Proceedings (OSTI)

On 9–10 September 2002, multiple mesovortices were captured in great detail by rapid scan visible satellite imagery in subtropical, then later, Tropical Storm Gustav. These mesovortices were observed as low-level cloud swirls while the low-level ...

Eric A. Hendricks; Michael T. Montgomery

2006-12-01T23:59:59.000Z

313

Sky View Factors from High-Resolution Scanned Fish-eye Lens Photographic Negatives  

Science Conference Proceedings (OSTI)

A computerized method for calculating the sky view factor from fish-eye lens photographic negatives is presented. The images are scanned and stored on CD ROM, each CD holding 100 images. The images can be retrieved at very high resolutions of up ...

Kristina Blennow

1995-12-01T23:59:59.000Z

314

Agentification of Markov model-based segmentation: Application to magnetic resonance brain scans  

Science Conference Proceedings (OSTI)

Objective: Markov random field (MRF) models have been traditionally applied to the task of robust-to-noise image segmentation. Most approaches estimate MRF parameters on the whole image via a global expectation-maximization (EM) procedure. The resulting ... Keywords: Distributed expectation maximization, Magnetic resonance brain scan segmentation, Markov random field, Medical imaging, Multiagents system

Benoit Scherrer; Michel Dojat; Florence Forbes; Catherine Garbay

2009-05-01T23:59:59.000Z

315

Single-Doppler Velocity Retrieval with Rapid-Scan Radar Data  

Science Conference Proceedings (OSTI)

An approximate (rapid scan) dynamical model for single-Doppler retrieval of the vector wind field is investigated. This approximate model is based on the Lagrangian form of the radial component of the equation of motion and is valid for retrieval ...

Alan Shapiro; Paul Robinson; Joshua Wurman; Jidong Gao

2003-12-01T23:59:59.000Z

316

Functions and Requirements for the DST Knuckle Region Ultrasonic Scanning System  

Science Conference Proceedings (OSTI)

This document defines the functions and requirements for a ultrasonic scanning system to provide an examination of the knuckle region of Hanford's double shell waste tanks, This document provides the basis for the ultrasonic concept selection, design, fabrication, and deployment methodology.

Pardini, Allan F.; Samuel, Todd J.

2001-01-29T23:59:59.000Z

317

Method for imaging liquid and dielectric materials with scanning polarization force microscopy  

DOE Patents (OSTI)

The invention images dielectric polarization forces on surfaces induced by a charged scanning force microscope (SFM) probe tip. On insulators, the major contribution to the surface polarizability at low frequencies is from surface ions. The mobility of these ions depends strongly on the humidity. Using the inventive SFM, liquid films, droplets, and other weakly adsorbed materials have been imaged.

Hu, Jun (Berkeley, CA); Ogletree, D. Frank (El Cerrito, CA); Salmeron, Miguel (El Cerrito, CA); Xiao, Xudong (Kowloon, CN)

1999-01-01T23:59:59.000Z

318

Apparatus for imaging liquid and dielectric materials with scanning polarization force microscopy  

DOE Patents (OSTI)

The invention images dielectric polarization forces on surfaces induced by a charged scanning force microscope (SFM) probe tip. On insulators, the major contribution to the surface polarizability at low frequencies is from surface ions. The mobility of these ions depends strongly on the humidity. Using the inventive SFM, liquid films, droplets, and other weakly adsorbed materials have been imaged. 9 figs.

Hu, J.; Ogletree, D.F.; Salmeron, M.; Xiao, X.

1998-04-28T23:59:59.000Z

319

Apparatus for imaging liquid and dielectric materials with scanning polarization force microscopy  

SciTech Connect

The invention images dielectric polarization forces on surfaces induced by a charged scanning force microscope (SFM) probe tip. On insulators, the major contribution to the surface polarizability at low frequencies is from surface ions. The mobility of these ions depends strongly on the humidity. Using the inventive SFM, liquid films, droplets, and other weakly adsorbed materials have been imaged.

Hu, Jun (Berkeley, CA); Ogletree, D. Frank (El Cerrito, CA); Salmeron, Miguel (El Cerrito, CA); Xiao, Xudong (Kowloon, CN)

1998-01-01T23:59:59.000Z

320

Method for imaging liquid and dielectric materials with scanning polarization force microscopy  

DOE Patents (OSTI)

The invention images dielectric polarization forces on surfaces induced by a charged scanning force microscope (SFM) probe tip. On insulators, the major contribution to the surface polarizability at low frequencies is from surface ions. The mobility of these ions depends strongly on the humidity. Using the inventive SFM, liquid films, droplets, and other weakly adsorbed materials have been imaged. 9 figs.

Hu, J.; Ogletree, D.F.; Salmeron, M.; Xiao, X.

1999-03-09T23:59:59.000Z

Note: This page contains sample records for the topic "differential scanning calorimetry" 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

Thin-film thickness measurement using x-ray peak ratioing in the scanning electron microscope  

Science Conference Proceedings (OSTI)

The procedure used to measure laser target film thickness using a scanning electron microscope is summarized. This method is generally applicable to any coating on any substrate as long as the electron energy is sufficient to penetrate the coating and the substrate produces an x-ray signal which can pass back through the coating and be detected. (MOW)

Elliott, N.E.; Anderson, W.E.; Archuleta, T.A.; Stupin, D.M.

1981-01-01T23:59:59.000Z

322

Optical Measurements of Capillary-Gravity Wave Spectra Using a Scanning Laser Slope Gauge  

Science Conference Proceedings (OSTI)

A description of a new scanning laser slope gauge (SLSG) is given and the results obtained from both laboratory wind-wave tank and field measurements are presented. The device relies on the measurements of two components of surface slope to ...

Erik J. Bock; Tetsu Hara

1995-04-01T23:59:59.000Z

323

Validation of Atlantic Ocean Sea Surface Temperatures Measured by the ERS-1 Along Track Scanning Radiometer  

Science Conference Proceedings (OSTI)

During the period from October 1991 to May 1992 the royal research ship Bransfield made its annual voyage from the United Kingdom to Antarctica and back. Whenever the measurement swath of the Along Track Scanning Radiometer (ATSR) on the ERS-1 ...

J. P. Thomas; J. Turner

1995-12-01T23:59:59.000Z

324

Development of New Methods in Scanning Probe Microscopy for Lignocellulosic Biomass Characterization  

E-Print Network (OSTI)

Methods Development of New Methods in Scanning Probe Microscopy for Lignocellulosic Biomass implicated in recalcitrance is important for utili- zation of lignocellulosic biomass in the world new technologies to explore the ultrastructure of biomass at nanoscale.4 Mode-synthesizing atomic

325

A Mobile Rapid-Scanning X-band Polarimetric (RaXPol) Doppler Radar System  

Science Conference Proceedings (OSTI)

A novel, rapid-scanning, X-band (3-cm wavelength), polarimetric (RaXPol), mobile radar was developed for severe-weather research. The radar employs a 2.4-m-diameter dual-polarized parabolic dish antenna on a high-speed pedestal capable of rotating ...

Andrew L. Pazmany; James B. Mead; Howard B. Bluestein; Jeffrey C. Snyder; Jana B. Houser

2013-07-01T23:59:59.000Z

326

Free volume hypothetical scanning molecular dynamics method for the absolute free energy of liquids  

E-Print Network (OSTI)

Free volume hypothetical scanning molecular dynamics method for the absolute free energy of liquids for calculating the absolute entropy, S, and free energy, F, by analyzing Boltzmann samples obtained by Monte. In this paper we remove the excluded volume EV restriction, replacing it by a "free volume" FV approach

Meirovitch, Hagai

327

Supervised identification and reconstruction of near-planar geological surfaces from terrestrial laser scanning  

Science Conference Proceedings (OSTI)

Terrestrial laser scanning is an effective method for digitally capturing outcrops, enabling them to be visualized, analyzed, and revisited in an office environment without the limitations of fieldwork (such as time constraints, weather conditions, outcrop ... Keywords: Bedding, Fractures, LIDAR, Moment of inertia analysis, Outcrop characterization, Segmentation

D. GarcíA-SelléS; O. Falivene; P. ArbuéS; O. Gratacos; S. Tavani; J. A. MuñOz

2011-10-01T23:59:59.000Z

328

Feasibility analysis of scanning 100% of maritime cargo containers for fissile material  

E-Print Network (OSTI)

On August 3, 2007, President George W. Bush signed into law H.R. 1: Implementing Recommendations of the 9/11 Commission Act of 2007. The law mandates that 100% of air and maritime cargo must be scanned prior to entering ...

Foley, William E., III

2008-01-01T23:59:59.000Z

329

Atmospheric Water Content over the Tropical Pacific Derived from the Nimbus-6 Scanning Microwave Spectrometer  

Science Conference Proceedings (OSTI)

The scanning microwave spectrometer (SCAMS) aboard Nimbus-6 contains a 22.23 GHz water vapor channel and 31.65 GHz window channel for deriving integrated water vapor (precipitable water) and cloud liquid water through a column over the oceans. ...

N. C. Grody; A. Gruber; W. C. Shen

1980-08-01T23:59:59.000Z

330

Single-Scan NMR Spectroscopy at Arbitrary Dimensions Yoav Shrot and Lucio Frydman*  

E-Print Network (OSTI)

Single-Scan NMR Spectroscopy at Arbitrary Dimensions Yoav Shrot and Lucio Frydman* Contribution resonance (NMR) provides one of the foremost analytical tools available to elucidate the structure a parametric incrementation of their values throughout independent experiments. Two-dimensional (2D) NMR

Frydman, Lucio

331

Three-Dimensional Mapping of Fluorescent Dye Using a Scanning, Depth-Resolving Airborne Lidar  

Science Conference Proceedings (OSTI)

Results are presented from a pilot study using a fluorescent dye tracer imaged by airborne lidar in the ocean surface layer on spatial scales of meters to kilometers and temporal scales of minutes to hours. The lidar used here employs a scanning, ...

M. A. Sundermeyer; E. A. Terray; J. R. Ledwell; A. G. Cunningham; P. E. LaRocque; J. Banic; W. J. Lillycrop

2007-06-01T23:59:59.000Z

332

Evolution of pulse shapes during compressor scans in a CPA system and control of electron acceleration in plasmas  

E-Print Network (OSTI)

of pulse shapes during compressor scans in a CPA system andused optical pulse compressor, the grating pair – withis the grating pulse compressor. In contrast to the most

2002-01-01T23:59:59.000Z

333

Differential aging from acceleration, an explicit formula  

E-Print Network (OSTI)

We consider a clock 'paradox' framework where an observer leaves an inertial frame, is accelerated and after an arbitrary trip comes back. We discuss a simple equation that gives, in the 1+1 dimensional case, an explicit relation between the time elapsed on the inertial frame and the acceleration measured by the accelerating observer during the trip. A non-closed trip with respect to an inertial frame appears closed with respect to another suitable inertial frame. Using this observation we define the differential aging as a function of proper time and show that it is non-decreasing. The reconstruction problem of special relativity is also discussed showing that its, at least numerical, solution would allow the construction of an 'inertial clock'.

E. Minguzzi

2004-11-25T23:59:59.000Z

334

Solving Partial Differential Equations on Overlapping Grids  

SciTech Connect

We discuss the solution of partial differential equations (PDEs) on overlapping grids. This is a powerful technique for efficiently solving problems in complex, possibly moving, geometry. An overlapping grid consists of a set of structured grids that overlap and cover the computational domain. By allowing the grids to overlap, grids for complex geometries can be more easily constructed. The overlapping grid approach can also be used to remove coordinate singularities by, for example, covering a sphere with two or more patches. We describe the application of the overlapping grid approach to a variety of different problems. These include the solution of incompressible fluid flows with moving and deforming geometry, the solution of high-speed compressible reactive flow with rigid bodies using adaptive mesh refinement (AMR), and the solution of the time-domain Maxwell's equations of electromagnetism.

Henshaw, W D

2008-09-22T23:59:59.000Z

335

Gases to gases n Scanning the horizon n Hunting the last ice sheet n Bugs, bogs and gravity www.planetearth.nerc.ac.uk Summer2010  

E-Print Network (OSTI)

of the Rewa Head Anacondas and giant otters ­ experiencing Guyana's biodiversity up close! 15 Scanning

336

MCS researchers coedit proceedings on automatic differentiation | Argonne  

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

MCS researchers coedit proceedings on automatic differentiation MCS researchers coedit proceedings on automatic differentiation July 22, 2013 Tweet EmailPrint The fundamental goal behind differentiating numerical computations is to be able to generate - ideally automatically - efficient derivative code for models implemented as computer programs. Achieving this goal in practice has proved challenging, especially for numerical models on parallel architectures. To track the progress in addressing the challenges, and to present the state of the art in automatic differentiation (AD), every four years the scientific community holds a conference focusing on AD applications in science and engineering, its theory, and the development of compiler-based tools and web-based differentiation services. The Sixth International Conference on Automatic Differentiation (AD2012) held in Fort Collins,

337

Continuous, Non-Invasive, In-Field Soil Carbon Scanning System  

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

Continuous, non-invasive, in-Field soil Continuous, non-invasive, in-Field soil Carbon sCanning system Background Vegetation and soils serve as carbon storage sinks for the approximately 2 billion tons of carbon absorbed annually by the global biosphere. While global warming is promoted by anthropogenic carbon dioxide (CO 2 ) emissions into the atmosphere, it is partially mitigated by carbon sequestration in the terrestrial ecosystem. However, a better understanding and monitoring of the underground carbon processes is necessary for evaluating various strategies for terrestrial carbon sequestration and quantification of the carbon stores for carbon credits. Description Brookhaven National Laboratory (BNL) has developed a multi-elemental scanning instrument for determining carbon analysis in soil. The method is based on inelastic

338

Collaborating for a "Perfect" Scan of Nuclear Matter | Brookhaven and the  

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

Collaborating for a "Perfect" Scan of Nuclear Matter Collaborating for a "Perfect" Scan of Nuclear Matter RHIC & LHC The Perfect Liquid The Critical Point superconducting magnets Superconducting magnets of the Large Hadron Collider (left) and Brookhaven's Relativistic Heavy Ion Collider (right). As the finishing touches are put on the world's most powerful particle accelerator in Switzerland, and plans for others pop up across the globe, Brookhaven's Relativistic Heavy Ion Collider (RHIC) continues to exploit its unique ability to explore the surprising features of matter bound by the strongest of Nature&'s forces. Although RHIC's overall mission is quite different from other machines on the horizon, new scientific facilities are incorporating heavy ion capabilities similar to RHIC. This healthy

339

ORNL/RASA-85/l OAK RIDGE NATIONAL LABORATORY RESULTS OF THE MOBILE GAMMA SCANNING  

Office of Legacy Management (LM)

d-I. 17-9 d-I. 17-9 d &y-?-T /,' k~:" , q ORNL/RASA-85/l OAK RIDGE NATIONAL LABORATORY RESULTS OF THE MOBILE GAMMA SCANNING ACTIVITIES IN NIAGARA FALLS, NEW YORK AREA ,. OPERATED BY MARTIN MARIEITA ENERGY SYSTEMS, INC. FOR THE UNITED STATES 'DEPARTMENT OF ENERGY ACCeSS t0 the information in this rePoti is limited (o those indicated on the distribution list and to Depanment of &ergy and Department of Energy Contractors Health and Safety Research Division EESULTS OFTBEMlBILEGAJMA SCANNING ACTIVITIES IN NIAGABAFALLS. NBR YOBKARBA W. B. Sbinpaugh, B. A. Berven, and W. D. Cottrell hQUBARANDrEEUICALWASlEWOGBA&5 (Activity No. AB 10 05 00 0; ONLWCOl) Manuscript Completed - February 1985 Date of Issue - August 1985 Investigation Team B. A. Berven - BASA Program Manager

340

Spectrometer for Sky-Scanning, Sun-Tracking Atmospheric Research (4STAR)  

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

Ames: Phil Russell, Jens Redemann, NASA Ames: Phil Russell, Jens Redemann, Ames: Phil Russell, Jens Redemann, NASA Ames: Phil Russell, Jens Redemann, Steve Dunagan, Roy Johnson: Steve Dunagan, Roy Johnson: Battelle PND: Connor Flynn, Beat Schmid, Battelle PND: Connor Flynn, Beat Schmid, Evgueni Kassianov Evgueni Kassianov NASA GSFC: Alexander Sinyuk, Brent NASA GSFC: Alexander Sinyuk, Brent Holben Holben , , & AERONET Team & AERONET Team Collaboration involving: Collaboration involving: NASA Ames, Battelle PND, NASA GSFC NASA Ames, Battelle PND, NASA GSFC 4S 4S TAR TAR : : S S pectrometer for pectrometer for S S ky ky - - S S canning, canning, S S un un - - T T racking racking A A tmospheric tmospheric R R esearch esearch 4STAR: 4STAR: Spectrometer Spectrometer for for Sky Sky - - Scanning Scanning , , Sun Sun - - Tracking Tracking Atmospheric Research Atmospheric Research

Note: This page contains sample records for the topic "differential scanning calorimetry" 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

Atomic-scale properties of semiconductor heterostructures probed by scanning tunneling microscopy  

SciTech Connect

The engineering of advanced semiconductor heterostructure materials and devices requires a detailed understanding of, and control over, the structure and properties of semiconductor materials and devices at the atomic to nanometer scale. Cross-sectional scanning tunneling microscopy has emerged as a unique and powerful method to characterize structural morphology and electronic properties in semiconductor epitaxial layers and device structures at these length scales. The basic experimental techniques in cross-sectional scanning tunneling microscopy are described, and some representative applications to semiconductor heterostructure characterization drawn from recent investigations in the authors laboratory are discussed. Specifically, they describe some recent studies of InP/InAsP and InAsP/InAsSb heterostructures in which nanoscale compositional clustering has been observed and analyzed.

Yu, E.T.; Zuo, S.L.; Bi, W.G.; Tu, C.W. [Univ. of California, San Diego, La Jolla, CA (United States). Dept. of Electrical and Computer Engineering; Biefeld, R.M.; Allerman, A.A. [Sandia National Labs., Albuquerque, NM (United States)

1998-05-01T23:59:59.000Z

342

C-Band Scanning ARM Precipitation Radar (C-SAPR) Handbook  

Science Conference Proceedings (OSTI)

The C-band scanning ARM precipitation radar (C-SAPR) is a scanning polarimetric Doppler radar transmitting simultaneously in both H and V polarizations. With a 350-kW magnetron transmitter, this puts 125 kW of transmitted power for each polarization. The receiver for the C-SAPR is a National Center for Atmospheric Research (NCAR) -developed Hi-Q system operating in a coherent-on-receive mode. The ARM Climate Research Facility operates two C-SAPRs; one of them is deployed near the Southern Great Plains (SGP) Central Facility near the triangular array of X-SAPRs, and the second C-SAPR is deployed at ARM’s Tropical Western Pacific (TWP) site on Manus Island in Papua New Guinea.

Widener, K; Bharadwaj, N

2012-11-13T23:59:59.000Z

343

Radiation Scanning Methods for Ship-to-Rail Intermodal Cargo Containers  

Science Conference Proceedings (OSTI)

The Department of Homeland Security’s (DHS) Domestic Nuclear Detection Office (DNDO) runs the Rail Test Center (RTC) at the Port of Tacoma (POT). The RTC affords DNDO with the opportunity to test radiological and nuclear threat detection systems associated with the unique on-dock rail environment while in an operational seaport. DNDO selected the Pacific Northwest National Laboratory (PNNL) to manage the RTC. The RTC is conducting various evaluation studies to assess scanning opportunities in terms of their affects on the num-ber of container moves required and the affect that the scanning opportunity has on the time it takes to move a container through the on-dock transfer process from ship to rail. The velocity and the number of container moves are directly associated with incremental costs to the terminal operators; increases in either of these parameters help in-form the potential for incremental costs that would result from the implementation of the opportunity.

Reichmuth, Barbara A.; Stansbury, Paul S.; Taira, Randal Y.; Sanquist, Thomas F.; Collins, Robert

2009-05-11T23:59:59.000Z

344

Rapid scanning of spatial distribution of spectral line intensities in PLT tokamak  

DOE Green Energy (OSTI)

A rotating mirror system has been constructed to allow repeated scanning during the discharge, in either poloidal (vertical) or toroidal (horizontal) direction, of selected spectral lines in PLT discharges. The maximum repetition rate for a poloidal scan is about 2 msec. The wavelength range, 2000 to 7000 A, is presently being increased to include the Schumann region, 1200 to 2000 A. Observations of radial profiles in the lines of HI, HeI, HeII, CIII, CV, OII and OV have revealed a number of curious asymmetries, which often change in the time during the discharge, as well as with change of plasma conditions, e.g., a change of aperture limiters from tungsten to carbon. The asymmetries tend to be more pronounced for the lower states of ionization, i.e., closer to the plasma periphery, and they are particularly strong near the times of disruptions caused by plasma instabilities.

Suckewer, S.; Hinnov, E.; Schivell, J.

1978-03-01T23:59:59.000Z

345

Comparison of radionuclide scans with computer-assisted tomography in diagnosis of intracranial disease  

SciTech Connect

Radionuclide brain scans were compared with computer-assisted tomography (CAT) for the diagnosis of intracranial disorders in 297 patients. The diagnosis was confirmed in 281 patients who formed the population for the study. The radionuclide scan was false positive for 12 patients (3.9 percent) and false negative for eight (2.6 percent). The CAT was false positive for three patients (1 percent) and false negative for one (0.3 percent). In the 133 patients in whom both tests were negative, no evidence of central nervous system pathology has been found during the 6 to 18 month follow-up. Brain tumors and intracerebral hemorrhage are more readily detectable with CAT.

Clifford, J.R.; Connolly, E.S.; Voorhies, R.M.

1976-12-01T23:59:59.000Z

346

Miniaturized hand held microwave interference scanning system for NDE of dielectric armor and armor systems  

Science Conference Proceedings (OSTI)

Inspection of ceramic-based armor has advanced through development of a microwave-based, portable, non-contact NDE system. Recently, this system was miniaturized and made wireless for maximum utility in field applications. The electronic components and functionality of the laboratory system are retained, with alternative means of position input for creation of scan images. Validation of the detection capability was recently demonstrated using specially fabricated surrogates and ballistic impact-damaged specimens. The microwave data results have been compared to data from laboratory-based microwave interferometry systems and digital x-ray imaging. The microwave interference scanning has been shown to reliably detect cracks, laminar features and material property variations. The authors present details of the system operation, descriptions of the test samples used and recent results obtained.

Schmidt, Karl F.; Little, Jack R. [Evisive, Inc., Baton Rouge, LA (United States); Ellingson, William A. [Argonne National Laboratory, Argonne, IL(United States); Meitzler, Thomas J. [US Army Research and Development Command Tank Automotive Research Development and Engineering Center, Warren, MI (United States); Green, William [US Army Research Laboratory, Aberdeen Proving Ground, MD (United States)

2011-06-23T23:59:59.000Z

347

Terrestrial laser scanning for measuring the solid wood volume, including branches, of adult standing trees in the forest environment  

Science Conference Proceedings (OSTI)

This study evaluates the potential of terrestrial laser scanning (TLS) to assess the solid wood volume (i.e., stem and branch diameters of more than 7cm) of adult standing trees in the forest environment. The solid wood volume of 42 trees of different ... Keywords: 3D tree modelling, Forestry, LiDAR, Terrestrial laser scanning, Wood volume

Mathieu Dassot; AuréLie Colin; Philippe Santenoise; Meriem Fournier; ThiéRy Constant

2012-11-01T23:59:59.000Z

348

Continuous, Non-Invasive, In-Field Soil Carbon Scanning System  

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

Continuous, Non-Invasive, In-Field Soil Continuous, Non-Invasive, In-Field Soil Carbon Scanning System Background Earth generates and emits an enormous amount of carbon dioxide into the atmos- phere from its deep energy resources, its near-surface processes, and biotic activi- ties. Although anthropogenic carbon dioxide emissions increase global warming, global warming is also alleviated by human activities in sequestering carbon into the terrestrial ecosystem and injecting carbon dioxide deep into geological formations,

349

Scanning transmission x-ray microscopy: A new ``looking glass`` into coal chemical structure  

SciTech Connect

This paper reports the use of scanning transmission x-ray microscopy to spatially map the chemistry of aromatic and aliphatic carbon functionalities in coal to a resolution of less than 0.1 {mu}m. Localized x-ray absorption spectroscopy recorded at the carbon K absorption edge was also used to facilitate analysis of variations in fundamental chemistry at maceral interfaces and within maceral boundaries.

Botto, R.E.; Cody, G.D.

1994-02-01T23:59:59.000Z

350

Response function and optimum configuration of semiconductor backscattered-electron detectors for scanning electron microscopes  

Science Conference Proceedings (OSTI)

A new highly efficient design for semiconductor detectors of intermediate-energy electrons (1-50 keV) for application in scanning electron microscopes is proposed. Calculations of the response function of advanced detectors and control experiments show that the efficiency of the developed devices increases on average twofold, which is a significant positive factor in the operation of modern electron microscopes in the mode of low currents and at low primary electron energies.

Rau, E. I. [Moscow State University (Russian Federation); Orlikovskiy, N. A. [Russian Academy of Sciences, Physical Technological Institute (Russian Federation); Ivanova, E. S. [Moscow State University (Russian Federation)

2012-06-15T23:59:59.000Z

351

Note: A scanning electron microscope sample holder for bidirectional characterization of atomic force microscope probe tips  

Science Conference Proceedings (OSTI)

A novel sample holder that enables atomic force microscopy (AFM) tips to be mounted inside a scanning electron microscopy (SEM) for the purpose of characterizing the AFM tips is described. The holder provides quick and easy handling of tips by using a spring clip to hold them in place. The holder can accommodate two tips simultaneously in two perpendicular orientations, allowing both top and side view imaging of the tips by the SEM.

Eisenstein, Alon; Goh, M. Cynthia [Department of Chemistry and Institute for Optical Sciences, University of Toronto, 80 St. George Street, Toronto M5S 3H6 (Canada)

2012-03-15T23:59:59.000Z

352

The RHIC Beam Energy Scan Program: Results from the PHENIX Experiment  

E-Print Network (OSTI)

The PHENIX Experiment at RHIC has conducted a beam energy scan at several collision energies in order to search for signatures of the QCD critical point and the onset of deconfinement. PHENIX has conducted measurements of transverse energy production, muliplicity fluctuations, and the skewness and kurtosis of net charge distributions. The data analyzed to date show no significant indications of the presence of the critical point.

J. T. Mitchell; for the PHENIX Collaboration

2012-11-26T23:59:59.000Z

353

A Scanning Auger Microprobe analysis of corrosion products associated with sulfate reducing bacteria  

Science Conference Proceedings (OSTI)

A Scanning Auger Microprobe analysis was performed on the corrosion products of an austenitic AISI type 304 SS after a potentiostatic polarization of one volt for ten minutes in a modified Postgate`s C media containing sulfate reducing bacteria. The corrosion products were characterized and mapped in local regions where pitting was observed. A critical evaluation of the applicability of this technique for the examination of microbially influenced corrosion (MIC) is presented.

Sadowski, R.A.; Chen, G.; Clayton, C.R.; Kearns, J.R. [State Univ. of New York, Stony Brook, NY (United States). Dept. of Materials Science and Engineering; Gillow, J.B.; Francis, A.J. [Brookhaven National Lab., Upton, NY (United States). Biosystems and Process Sciences Div.

1995-03-01T23:59:59.000Z

354

Wall scanning probe for high-field side plasma measurements on Alcator C-Mod  

Science Conference Proceedings (OSTI)

A new, high-field side scanning probe has been added to Alcator C-Mod's complement of edge diagnostics. The wall scanning probe is designed to provide all the benefits of a linear plunge, multielectrode scanning probe while working from the confined space of the inner tokamak wall. The drive mechanism is an embedded coil which produces a torque with the ambient toroidal magnetic field when energized, thus allowing the probe to plunge to different preprogramed depths at different times during a plasma discharge. The probe tip is designed for easy replacement and is presently configured to operate as a modified, high heat-flux ''Gundestrup-type'' probe with four tungsten electrodes. The probe has demonstrated the ability to obtain cross-field profiles for electron temperature, density, floating potential, and plasma flow information (parallel and perpendicular to B) up to a depth of a few millimiters inside the last-closed flux surface in standard C-Mod discharges. The tungsten-tipped probe has proved very robust and shows little or no damage though it routinely handles surface heat fluxes on the order of 100 MW/m{sup 2} at peak insertion.

Smick, Noah; LaBombard, Brian [Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)

2009-02-15T23:59:59.000Z

355

Nitrogen control of chloroplast differentiation. Final report  

DOE Green Energy (OSTI)

This project was directed toward understanding at the physiological, biochemical and molecular levels of how photosynthetic organisms adapt to long-term nitrogen-deficiency conditions is quite incomplete even though limitation of this nutrient is the most commonly restricts plant growth and development. For our work on this problem, the unicellular green alga, Chlamydomonas reinhardtii, was grown in continuous cultures in which steady-state levels of nitrogen can be precisely controlled. N-limited cells exhibit the classical symptoms of deficiency of this nutrient, chlorosis and slow growth rates, and respond to nitrogen provision by rapid greening and chloroplast differentiation. We have addressed three aspects of this problem: (1) the regulation of pigment synthesis; (2) control of expression of nuclear genes encoding photosynthetic proteins; (3) changes in metabolic and electron transport pathways that enable sustained CO{sub 2} fixation even though they cannot be readily converted into amino and nucleic acids. For the last, principle components are: (a) enhanced mitochondrial respiratory activity intimately associated with photosynthates, and (b) the occurrence in thylakoids of a supplemental electron transport pathway that facilitates reduction of the plastoquinone pool. Together, these distinguishing features of N-limited cells are likely to enable cell survival, especially under conditions of high irradiance stress.

Schmidt, G.W.

1998-05-01T23:59:59.000Z

356

A Taylor polynomial approach for solving differential-difference equations  

Science Conference Proceedings (OSTI)

The purpose of this study is to give a Taylor polynomial approximation for the solution of mth-order linear differential-difference equations with variable coefficients under the mixed conditions about any point. For this purpose, Taylor matrix method ... Keywords: 39A10, 41A10, 65Q05, Differential-difference equations, Taylor matrix method, Taylor polynomial solutions, Taylor polynomials and series

Mustafa Gülsu; Mehmet Sezer

2006-02-01T23:59:59.000Z

357

Brief paper: Axiomatic characterization of linear differential systems (and operators)  

Science Conference Proceedings (OSTI)

In his IEEE Trans. Aut. Contr. paper in 1991, Willems posed the following question: given a set of smooth trajectories, when does there exist a linear constant coefficient differential operator whose kernel is precisely the given set? We show that the ... Keywords: Jet-closed, Jet-determined, Jets, LTID systems, Linear differential operators, t-adic topologies

Vakhtang Lomadze

2012-05-01T23:59:59.000Z

358

Automatic Differentiation of Codes in Nuclear Engineering Applications  

E-Print Network (OSTI)

automatic differentiation (AD) [14] to cal- culations with the nuclear reactor simulation code MATWS difficult with nuclear reactor simulation codes that may be written using older programming practices, only is a first attempt to differentiate a nuclear reactor code with significant legacy components. The issues

Anitescu, Mihai

359

A differential game of joint implementation of environmental projects  

Science Conference Proceedings (OSTI)

This paper proposes a two-player, finite-horizon differential game model to analyze joint implementation in environmental projects, one of the flexible mechanisms considered in the Kyoto Protocol. Our results show that allowing for foreign investments ... Keywords: Differential games, Environment, Joint implementation

MichèLe Breton; Georges Zaccour; Mehdi Zahaf

2005-10-01T23:59:59.000Z

360

GRworkbench: A Computational System Based on Differential Geometry  

E-Print Network (OSTI)

We have developed a new tool for numerical work in General Relativity: GRworkbench. While past tools have been ad hoc, GRworkbench closely follows the framework of Differential Geometry to provide a robust and general way of computing on analytically defined space-times. We discuss the relationship between Differential Geometry and C++ classes in GRworkbench, and demonstrate their utility.

Susan M Scott; Benjamin J K Evans; Antony C Searle

2001-11-19T23:59:59.000Z

Note: This page contains sample records for the topic "differential scanning calorimetry" 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

A 2-Opt based differential evolution for global optimization  

Science Conference Proceedings (OSTI)

Differential evolution (DE) is a simple and effective global optimization algorithm. It has been successfully applied to solve a wide range of real-world optimization problems. However, DE has shown some weaknesses, especially the long computational ... Keywords: 2-Opt algorithm, Differential evolution, Optimization

Cheng-Wen Chiang; Wei-Ping Lee; Jia-Sheng Heh

2010-09-01T23:59:59.000Z

362

Recent advances in differential evolution: a survey and experimental analysis  

Science Conference Proceedings (OSTI)

Differential Evolution (DE) is a simple and efficient optimizer, especially for continuous optimization. For these reasons DE has often been employed for solving various engineering problems. On the other hand, the DE structure has some limitations in ... Keywords: Comparative Analysis, Continuous Optimization, Differential Evolution, Self-Adaptation, Survey

Ferrante Neri; Ville Tirronen

2010-02-01T23:59:59.000Z

363

A Lyapunov approach to the stability of fractional differential equations  

Science Conference Proceedings (OSTI)

Lyapunov stability of fractional differential equations is addressed in this paper. The key concept is the frequency distributed fractional integrator model, which is the basis for a global state space model of FDEs. Two approaches are presented: the ... Keywords: Fractional differential equations, Fractional integrator, Lyapunov stability, Nonlinear FDEs, State space models

J. C. Trigeassou; N. Maamri; J. Sabatier; A. Oustaloup

2011-03-01T23:59:59.000Z

364

Differential evolution approach for optimal reactive power dispatch  

Science Conference Proceedings (OSTI)

Differential evolution based optimal reactive power dispatch for real power loss minimization in power system is presented in this paper. The proposed methodology determines control variable settings such as generator terminal voltages, tap positions ... Keywords: Differential evolution, Loss minimization, Optimal power flow, Penalty function, Reactive power dispatch

M. Varadarajan; K. S. Swarup

2008-09-01T23:59:59.000Z

365

Hubble Space Telescope hot Jupiter Transmission Spectral Survey: detection of water in HAT-P-1b from Wide Field Camera 3 near-infrared spatial scan observations  

E-Print Network (OSTI)

We present Hubble Space Telescope near-infrared transmission spectroscopy of the transiting hot-Jupiter HAT-P-1b. We observed one transit with Wide Field Camera 3 using the G141 low-resolution grism to cover the wavelength range 1.087- 1.678 {\\mu}m. These time series observations were taken with the newly available spatial scan mode that increases the duty cycle by nearly a factor of two, thus improving the resulting photometric precision of the data. We measure a planet-to-star radius ratio of Rp/R*=0.11709+/-0.00038 in the white light curve with the centre of transit occurring at 2456114.345+/-0.000133 (JD). We achieve S/N levels per exposure of 1840 (0.061%) at a resolution of {\\Delta\\lambda}=19.2nm (R~70) in the 1.1173 - 1.6549{\\mu}m spectral region, providing the precision necessary to probe the transmission spectrum of the planet at close to the resolution limit of the instrument. We compute the transmission spectrum using both single target and differential photometry with similar results. The resultan...

Wakeford, H R; Deming, D; Gibson, N P; Fortney, J J; Burrows, A S; Ballester, G; Nikolov, N; Aigrain, S; Henry, G; Knutson, H; Etangs, A Lecavelier des; Pont, F; Showman, A P; Vidal-Madjar, A; Zahnle, K

2013-01-01T23:59:59.000Z

366

Brain scanning with 201 Thallium. Comparative study with D. T. P. A. sup(99m)Tc brain radioangiogram  

SciTech Connect

Data of brain scans with /sup 201/Th and sup(99m)Tc - D.T.P.A. are studied in 43 patients. Some of the results sustained earlier data form Ancri (1978): lack of interest through vascular diseases, good sensitivity for the focalized brain lesions (24/25). But new features are underlined: occurrence of false-positive, intermediary patterns laying between normal scan and focal pathologic distributions but without etiologic correspondance. The quantified contrast is usually better with sup(99m)Tc - D.T.P.A. than with /sup 201/Th: these data challenge Ancri's ones. Actual indications of Thallium brain scan are discussed.

Steinling, M.; Marchandise, X.; Destee, A.; Coequyt, S.; Warot, P.; Vergnes, R. (C.H.U. Lille (France))

1982-05-01T23:59:59.000Z

367

Systematic evaluation of four-dimensional hybrid depth scanning for carbon-ion lung therapy  

Science Conference Proceedings (OSTI)

Purpose: Irradiation of a moving target with a scanning beam requires a comprehensive understanding of organ motion as well as a robust dose error mitigation technique. The authors studied the effects of intrafractional respiratory motion for carbon-ion pencil beam scanning with phase-controlled rescanning on dose distributions for lung tumors. To address density variations, they used 4DCT data. Methods: Dose distributions for various rescanning methods, such as simple layer rescanning (LR), volumetric rescanning, and phase-controlled rescanning (PCR), were calculated for a lung phantom and a lung patient studies. To ensure realism, they set the scanning parameters such as scanning velocity and energy variation time to be similar to those used at our institution. Evaluation metrics were determined with regard to clinical relevance, and consisted of (i) phase-controlled rescanning, (ii) sweep direction, (iii) target motion (direction and amplitude), (iv) respiratory cycle, and (v) prescribed dose. Spot weight maps were calculated by using a beam field-specific target volume, which takes account of range variations for respective respiratory phases. To emphasize the impact of intrafractional motion on the dose distribution, respiratory gating was not used. The accumulated dose was calculated by applying a B-spline-based deformable image registration, and the results for phase-controlled layered rescanning (PCR{sub L}) and phase-controlled volumetric rescanning (PCR{sub V}) were compared. Results: For the phantom study, simple LR was unable to improve the dose distributions for an increased number of rescannings. The phase-controlled technique without rescanning (1 Multiplication-Sign PCR{sub L} and 1 Multiplication-Sign PCR{sub V}) degraded dose conformity significantly due to a reduced scan velocity. In contrast, 4 Multiplication-Sign PCR{sub L} or more significantly and consistently improved dose distribution. PCR{sub V} showed interference effects, but in general also improved dose homogeneity with higher numbers of rescannings. Dose distributions with single PCR{sub L}/PCR{sub V} with a sweep direction perpendicular to motion direction showed large hot/cold spots; however, this effect vanished with higher numbers of rescannings for both methods. Similar observations were obtained for the other dose metrics, such as target motion (SI/AP), amplitude (6-22 mm peak-to-peak) and respiratory period (3.0-5.0 s). For four or more rescannings, both methods showed significantly better results, albeit that volumetric PCR was more affected by interference effects, which lead to severe degradation of a few dose distributions. The clinical example showed the same tendencies as the phantom study. Dose assessment metrics (D95, Dmax/Dmin, homogeneity index) were improved with an increasing number of PCR{sub L}/PCR{sub V}, but with PCR{sub L} being more robust. Conclusions: PCR{sub L} requires a longer treatment time than PCR{sub V} for high numbers of rescannings in the NIRS scanning system but is more robust. Although four or more rescans provided good dose homogeneity and conformity, the authors prefer to use more rescannings for clinical cases to further minimize dose degradation effects due to organ motion.

Mori, Shinichiro; Furukawa, Takuji; Inaniwa, Taku; Zenklusen, Silvan; Nakao, Minoru; Shirai, Toshiyuki; Noda, Koji [Research Center for Charged Particle Therapy, National Institute of Radiological Sciences, Inage-ku, Chiba 263-8555 (Japan)

2013-03-15T23:59:59.000Z

368

Principal Component Analysis of Spectroscopic Imaging Data in Scanning Probe Microscopy  

SciTech Connect

The approach for data analysis in band excitation family of scanning probe microscopies based on principal component analysis (PCA) is explored. PCA utilizes the similarity between spectra within the image to select the relevant response components. For small signal variations within the image, the PCA components coincide with the results of deconvolution using simple harmonic oscillator model. For strong signal variations, the PCA allows effective approach to rapidly process, de-noise and compress the data. The extension of PCA for correlation function analysis is demonstrated. The prospects of PCA as a universal tool for data analysis and representation in multidimensional SPMs are discussed.

Jesse, Stephen [ORNL; Kalinin, Sergei V [ORNL

2009-01-01T23:59:59.000Z

369

Robust atomic resolution imaging of light elements using scanning transmission electron microscopy  

SciTech Connect

We show that an annular detector placed within the bright field cone in scanning transmission electron microscopy allows direct imaging of light elements in crystals. In contrast to common high angle annular dark field imaging, both light and heavy atom columns are visible simultaneously. In contrast to common bright field imaging, the images are directly and robustly interpretable over a large range of thicknesses. We demonstrate this through systematic simulations and present a simple physical model to obtain some insight into the scattering dynamics.

Findlay, S. D. [Institute of Engineering Innovation, School of Engineering, University of Tokyo, Tokyo 113-8656 (Japan); Shibata, N. [Institute of Engineering Innovation, School of Engineering, University of Tokyo, Tokyo 113-8656 (Japan); PRESTO, Japan Science and Technology Agency, Saitama 332-0012 (Japan); Sawada, H.; Okunishi, E.; Kondo, Y. [JEOL Ltd., Tokyo 196-8558 (Japan); Yamamoto, T. [Institute of Engineering Innovation, School of Engineering, University of Tokyo, Tokyo 113-8656 (Japan); Nanostructures Research Laboratory, Japan Fine Ceramic Center, Nagoya 456-8587 (Japan); Ikuhara, Y. [Institute of Engineering Innovation, School of Engineering, University of Tokyo, Tokyo 113-8656 (Japan); Nanostructures Research Laboratory, Japan Fine Ceramic Center, Nagoya 456-8587 (Japan); WPI Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577 (Japan)

2009-11-09T23:59:59.000Z

370

Scanning electron microscopic analyses of Ferrocyanide tank wastes for the Ferrocyanide safety program  

Science Conference Proceedings (OSTI)

This is Fiscal Year 1995 Annual Report on the progress of activities relating to the application of scanning electron microscopy in addressing the Ferrocyanide Safety Issue associated with Hanford Site high-level radioactive waste tanks. The status of the FY 1995 activities directed towards establishing facilities capable of providing SEM based micro-characterization of ferrocyanide tank wastes is described. A summary of key events in the SEM task over FY 1995 and target activities in FY 1996 are presented. A brief overview of the potential applications of computer controlled SEM analytical data in light of analyses of ferrocyanide simulants performed by an independent contractor is also presented

Callaway, W.S.

1995-09-01T23:59:59.000Z

371

Seafloor Classification using Contour Maps Recovered from Side-Scan Sonar  

E-Print Network (OSTI)

Conventional seabed texture segmentation algorithms extract features from images using the gray level intensity of the side-scan images. In this paper we present a method for the classi cation of texture seabeds based on height information. First we propose a new method for the reconstruction of the seabeds by combining a backscattering model and exploiting the geometry of the sonar. The recovery performance of the surface is compared with a previously published method. Afterwards a simple classi cation procedure is applied over rocky and ripple seabeds by using contours maps recovered from sidescan sonar images. 80:8% of the reconstructed seabeds were succesfully classi ed.

Esther Dura; Judith Bell; Dave Lane

2001-01-01T23:59:59.000Z

372

Visualizing Macromolecular Complexes with In Situ Liquid Scanning Transmission Electron Microscopy  

SciTech Connect

A central focus of biological research is understanding the structure/function relationship of macromolecular protein complexes. Yet conventional transmission electron microscopy techniques are limited to static observations. Here we present the first direct images of purified macromolecular protein complexes using in situ liquid scanning transmission electron microscopy. Our results establish the capability of this technique for visualizing the interface between biology and nanotechnology with high fidelity while also probing the interactions of biomolecules within solution. This method represents an important advancement towards allowing future high-resolution observations of biological processes and conformational dynamics in real-time.

Evans, James E.; Jungjohann, K. L.; Wong, Peony C. K.; Chiu, Po-Lin; Dutrow, Gavin H.; Arslan, Ilke; Browning, Nigel D.

2012-11-01T23:59:59.000Z

373

Structure and Reactions of Carbon and Hydrogen on Ru(0001): A Scanning Tunneling Microscopy Study  

DOE Green Energy (OSTI)

The interaction between carbon and hydrogen atoms on a Ru(0001) surface was studied using scanning tunneling microscopy (STM), Density Functional Theory (DFT) and STM image calculations. Formation of CH species by reaction between adsorbed H and C was observed to occur readily at 100 K. When the coverage of H increased new complexes of the form CH+nH (n = 1, 2 and 3) were observed. These complexes, never observed before, might be precursors for further hydrogenation reactions. DFT analysis reveals that a considerable energy barrier exists for the CH+H {yields} CH{sub 2} reaction.

Shimizu, Tomoko K.; Mugarza, Aitor; Cerda, Jorge; Salmeron, Miquel

2008-09-09T23:59:59.000Z

374

Phenomenology Studies Using a Scanning Fully Polarimetric Passive W-Band Millimeter Wave Imager  

SciTech Connect

We present experimental results obtained from a scanning passive W-band fully polarimetric imager. In addition to a conventional approach to polarimetric image analysis in which the Stokes I, Q, U, and V images were formed and displayed, we present an alternative method for polarimetric image exploitation based upon multivariate image analysis (MIA). MIA uses principal component analysis (PCA) and 2D scatter or score plots to identify various pixel classes in the image compared with the more conventional scene-based image analysis approaches. Multivariate image decomposition provides a window into the complementary interplay between spatial and statistical correlations contained in the data.

Bernacki, Bruce E.; Kelly, James F.; Sheen, David M.; McMakin, Douglas L.; Tedeschi, Jonathan R.; Hall, Thomas E.; Hatchell, Brian K.; Valdez, Patrick LJ

2011-05-01T23:59:59.000Z

375

The Scanning Electron Microscope As An Accelerator For The Undergraduate Advanced Physics Laboratory  

Science Conference Proceedings (OSTI)

Few universities or colleges have an accelerator for use with advanced physics laboratories, but many of these institutions have a scanning electron microscope (SEM) on site, often in the biology department. As an accelerator for the undergraduate, advanced physics laboratory, the SEM is an excellent substitute for an ion accelerator. Although there are no nuclear physics experiments that can be performed with a typical 30 kV SEM, there is an opportunity for experimental work on accelerator physics, atomic physics, electron-solid interactions, and the basics of modern e-beam lithography.

Peterson, Randolph S. [Department of Physics and Astronomy, University of the South, 735 University Avenue, Sewanee TN 37383 (United States); Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, 50 Vassar Street, Cambridge MA 01239 (United States); Berggren, Karl K.; Mondol, Mark [Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, 50 Vassar Street, Cambridge MA 01239 (United States)

2011-06-01T23:59:59.000Z

376

Development of a microfluidic device for patterning multiple species by scanning probe lithography  

E-Print Network (OSTI)

Scanning Probe Lithography (SPL) is a versatile nanofabrication platform that leverages microfluidic “ink” delivery systems with Scanning Probe Microscopy (SPM) for generating surface-patterned chemical functionality on the sub-100 nm length scale. One of the prolific SPL techniques is Dip Pen Nanolithography™ (DPN™). High resolution, multiplexed registration and parallel direct-write capabilities make DPN (and other SPL techniques) a power tool for applications that are envisioned in micro/nano-electronics, molecular electronics, catalysis, cryptography (brand protection), combinatorial synthesis (nano-materials discovery and characterization), biological recognition, genomics, and proteomics. One of the greatest challenges for the successful performance of the DPN process is the delivery of multiple inks to the scanning probe tips for nano-patterning. The purpose of the present work is to fabricate a microfluidic ink delivery device (called “Centiwell”) for DPN (and other SPL) applications. The device described in this study maximizes the number of chemical species (inks) for nanofabrication that can be patterned simultaneously by DPN to conform the industrial standards for fluid handling for biochemical assays (e.g., genomic and proteomic). Alternate applications of Centiwell are also feasible for the various envisioned applications of DPN (and other SPL techniques) that were listed above. The Centiwell consists of a two-dimensional array of 96 microwells that are bulk micromachined on a silicon substrate. A thermoelectric module is attached to the back side of the silicon substrate and is used to cool the silicon substrate to temperatures below the dew point. By reducing the temperature of the substrate to below the dew point, water droplets are condensed in the microwell array. Microbeads of a hygroscopic material (e.g., poly-ethylene glycol) are dispensed into the microwells to prevent evaporation of the condensed water. Furthermore, since poly-ethylene glycol (PEG) is water soluble, it forms a solution inside the microwells which is subsequently used as the ink for the DPN process. The delivery of the ink to the scanning probe tip is performed by dipping the tip (or multiple tips in an array) into the microwells containing the PEG solution. This thesis describes the various development steps for the Centiwell. These steps include the mask design, the bulk micromachining processes explored for the micro-fabrication of the microwell array, the thermal design calculations performed for the selection of the commercially available thermoelectric coolers, the techniques explored for the synthesis of the PEG microbeads, and the assembly of all the components for integration into a functional Centiwell. Finally, the successful implementation of the Centiwell for nanolithography of PEG solutions is also demonstrated.

Rivas Cardona, Juan Alberto

2006-08-01T23:59:59.000Z

377

Scanning angle Raman spectroscopy: Investigation of Raman scatter enhancement techniques for chemical analysis  

SciTech Connect

This thesis outlines advancements in Raman scatter enhancement techniques by applying evanescent fields, standing-waves (waveguides) and surface enhancements to increase the generated mean square electric field, which is directly related to the intensity of Raman scattering. These techniques are accomplished by employing scanning angle Raman spectroscopy and surface enhanced Raman spectroscopy. A 1064 nm multichannel Raman spectrometer is discussed for chemical analysis of lignin. Extending dispersive multichannel Raman spectroscopy to 1064 nm reduces the fluorescence interference that can mask the weaker Raman scattering. Overall, these techniques help address the major obstacles in Raman spectroscopy for chemical analysis, which include the inherently weak Raman cross section and susceptibility to fluorescence interference.

Meyer, Matthew W. [Ames Laboratory

2013-03-14T23:59:59.000Z

378

Formation of graphene layers by vacuum sublimation of silicon carbide using a scanning heat source  

Science Conference Proceedings (OSTI)

The kinetics of surface graphitization during dissociative vacuum evaporation of silicon carbide, under the effect of a scanning heat source, is studied. A model of the process is developed. The model provides a means for theoretically treating the dynamics of formation and the number of residual carbon atomic layers. The vapor stoichiometric coefficient which ensures the minimization of the number of structural defects in graphene, is optimized at the sublimation temperature: {theta} = 1/{eta}(T{sub max}). The proposed method can be used as a basis for graphene production technology.

Dmitriev, A. N.; Cherednichenko, D. I., E-mail: cheredni@fep.tti.sfedu.ru [Southern Federal University, Taganrog Technological Institute (Russian Federation)

2011-12-15T23:59:59.000Z

379

Scanning Lidar Based Atmospheric Monitoring for Fluorescent Detectors of Cosmic Showers  

E-Print Network (OSTI)

Measurements of the cosmic-ray air-shower fluorescence at extreme energies require precise knowledge of atmospheric conditions. The absolute calibration of the cosmic-ray energy depends on the absorption of fluorescence light between its origin and point of its detection. To reconstruct basic atmospheric parameters we review a novel analysis method based on two- and multi-angle measurements performed by the scanning backscatter lidar system. Applied inversion methods, optical depth, absorption and backscatter coefficient, as well as other parameters that enter the lidar equation are discussed in connection to the attenuation of the light traveling from shower to fluorescence detector.

A. Filipcic; M. Horvat; D. Veberic; D. Zavrtanik; M. Zavrtanik

2002-02-06T23:59:59.000Z

380

K.: Automatic alignment of a camera with a line scan lidar system  

E-Print Network (OSTI)

Abstract — We propose a new method for extrinsic calibration of a line-scan LIDAR with a perspective projection camera. Our method is a closed-form, minimal solution to the problem. The solution is a symbolic template found via variable elimination and the multi-polynomial Macaulay resultant. It does not require initialization, and can be used in an automatic calibration setting when paired with RANSAC and least-squares refinement. We show the efficacy of our approach through a set of simulations and a real calibration. I.

Oleg Naroditsky; Er Patterson Iv; Kostas Daniilidis

2011-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "differential scanning calorimetry" 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

A Geometric Model for Odd Differential K-theory.  

E-Print Network (OSTI)

Odd $K$-theory has the interesting property that it admits an infinite number of nonequivalent differential refinements. In this paper we provide a bundle theoretic model for odd differential $K$-theory using the caloron correspondence and prove that this refinement is unique up to a unique natural isomorphism. We characterise the odd Chern character and its transgression form in terms of a connection and Higgs field and discuss some applications. Our model can be seen as the odd counterpart to the Simons-Sullivan construction of even differential $K$-theory.

Pedram Hekmati; Michael K. Murray; Vincent S. Schlegel; Raymond F. Vozzo

382

Iterated Differential Forms IV: C-Spectral Sequence  

E-Print Network (OSTI)

For the multiple differential algebra of iterated differential forms (see math.DG/0605113 and math.DG/0609287) on a diffiety (O,C) an analogue of C-spectral sequence is constructed. The first term of it is naturally interpreted as the algebra of secondary iterated differential forms on (O,C). This allows to develop secondary tensor analysis on generic diffieties, some simplest elements of which are sketched here. The presented here general theory will be specified to infinite jet spaces and infinitely prolonged PDEs in subsequent notes.

A. M. Vinogradov; L. Vitagliano

2006-10-30T23:59:59.000Z

383

Moving Cellular Structure of Fog Echoes Obtained with a Millimeter-Wave Scanning Doppler Radar at Kushiro, Japan  

Science Conference Proceedings (OSTI)

Observations of fogs with a millimeter-wave scanning Doppler radar were conducted at Kushiro in Hokkaido, Japan, in the summer seasons of 1999 and 2000. Three typical types of plan position indicator (PPI) displays were observed: cellular echoes ...

Akihisa Uematsu; Hiroyuki Hashiguchi; Michihiro Teshiba; Hisamichi Tanaka; Koichi Hirashima; Shoichiro Fukao

2005-08-01T23:59:59.000Z

384

Rapid-Scan Super-Resolution Observations of a Cyclic Supercell with a Dual-Polarization WSR-88D  

Science Conference Proceedings (OSTI)

In recent years, there has been widespread interest in collecting and analyzing rapid updates of radar data in severe convective storms. To this end, conventional single-polarization rapid-scan radars and phased array radar systems have been ...

Matthew R. Kumjian; Alexander V. Ryzhkov; Valery M. Melnikov; Terry J. Schuur

2010-10-01T23:59:59.000Z

385

Ice Cloud Retrievals and Analysis with the Compact Scanning Submillimeter Imaging Radiometer and the Cloud Radar System during CRYSTAL FACE  

Science Conference Proceedings (OSTI)

Submillimeter-wave radiometry is a new technique for determining ice water path (IWP) and particle size in upper-tropospheric ice clouds. The first brightness temperatures images of ice clouds above 340 GHz were measured by the Compact Scanning ...

K. Franklin Evans; James R. Wang; Paul E. Racette; Gerald Heymsfield; Lihua Li

2005-06-01T23:59:59.000Z

386

Observations of Ice Crystal Habits with a Scanning Polarimetric W-Band Radar at Slant Linear Depolarization Ratio Mode  

Science Conference Proceedings (OSTI)

Scanning polarimetric W-band radar data were evaluated for the purpose of identifying predominant ice hydrometeor habits. Radar and accompanying cloud microphysical measurements were conducted during the Storm Peak Laboratory Cloud Property ...

Sergey Y. Matrosov; Gerald G. Mace; Roger Marchand; Matthew D. Shupe; Anna G. Hallar; Ian B. McCubbin

2012-08-01T23:59:59.000Z

387

Use of a ground-based scanning lidar for estimation of biophysical properties of western larch (Larix occidentalis)  

Science Conference Proceedings (OSTI)

Ground-based laser scanners represent a relatively new technology that promises to enhance the ability to remotely sense biophysical properties of vegetation. In this study, we utilized a commercially available discrete-return ground-based laser scanning ...

R. Clawges; L. Vierling; M. Calhoon; M. Toomey

2007-09-01T23:59:59.000Z

388

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

389

CCD drift-scan imaging lunar occultations: a feasible approach for sub-meter class telescopes  

E-Print Network (OSTI)

A CCD drift-scanning technique for lunar occultation (LO) observations is presented. While this approach has been addressed before by Sturmann (1994) for the case of large telescopes, the technical validity has never been discussed for sub-meter class telescopes. In contrast to Sturmann's scheme, the proposed technique places the CCD in the image plane of the telescope. This does not represent a problem in the case of small telescopes, where the practical angular resolution attainable by LO is not limited by aperture smoothing. Photon-generated charge is read out at millisecond rate on a column-per-column basis, as the diffraction pattern of the occulted star is being tracked. Two LO events (SAO 79031 and SAO 77911) were observed to demonstrate the feasibility of the method. Data analysis was carried out and no angular diameter the observed stars were resolved. We show, however, that the technique could be useful for close binary detections with small telescopes. A discussion of the limiting resolution and magnitude imposed by our instrumentation is carried out, showing that drift-scanning technique could be extended to 1-2m telescopes for stellar diameter determination purposes. Finally, we point out that the technical demands required by this technique can be easily met by most small professional observatories and advanced amateurs.

O. Fors; J. Nunez; A. Richichi

2001-08-27T23:59:59.000Z

390

A TECHNIQUE FOR PRIMARY BEAM CALIBRATION OF DRIFT-SCANNING, WIDE-FIELD ANTENNA ELEMENTS  

SciTech Connect

We present a new technique for calibrating the primary beam of a wide-field, drift-scanning antenna element. Drift-scan observing is not compatible with standard beam calibration routines, and the situation is further complicated by difficult-to-parameterize beam shapes and, at low frequencies, the sparsity of accurate source spectra to use as calibrators. We overcome these challenges by building up an interrelated network of source 'crossing points'-locations where the primary beam is sampled by multiple sources. Using the single assumption that a beam has 180 Degree-Sign rotational symmetry, we can achieve significant beam coverage with only a few tens of sources. The resulting network of crossing points allows us to solve for both a beam model and source flux densities referenced to a single calibrator source, circumventing the need for a large sample of well-characterized calibrators. We illustrate the method with actual and simulated observations from the Precision Array for Probing the Epoch of Reionization.

Pober, Jonathan C.; Parsons, Aaron R. [Astronomy Department, University of California, Berkeley, CA (United States); Jacobs, Daniel C. [School of Earth and Space Exploration, Arizona State University, Tempe, AZ (United States); Aguirre, James E.; Moore, David F. [Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, PA (United States); Bradley, Richard F.; Parashare, Chaitali R. [Department of Electrical and Computer Engineering, University of Virginia, Charlottesville, VA (United States); Carilli, Chris L. [National Radio Astronomy Observatory, Socorro, NM (United States); Gugliucci, Nicole E. [Department of Astronomy, University of Virginia, Charlottesville, VA (United States)

2012-02-15T23:59:59.000Z

391

Near-field Microwave Scanning Probe Imaging of Conductivity Inhomogeneities in CVD Graphene  

SciTech Connect

We have performed near-field scanning microwave microscopy (SMM) of graphene grown by chemical vapor deposition. Due to the use of probe-sample capacitive coupling and a relatively high ac frequency of a few GHz, this scanning probe method allows mapping of local conductivity without a dedicated counter electrode, with a spatial resolution of about 50 nm. Here, the coupling was enabled by atomic layer deposition of alumina on top of graphene, which in turn enabled imaging both large-area films, as well as micron-sized islands, with a dynamic range covering a low sheet resistance of a metal film and a high resistance of highly disordered graphene. The structures of graphene grown on Ni films and Cu foils are explored, and the effects of growth conditions are elucidated. We present a simple general scheme for interpretation of the contrast in the SMM images of our graphene samples and other two-dimensional conductors, which is supported by extensive numerical finite-element modeling. We further demonstrate that combination of the SMM and numerical modeling allows quantitative information about the sheet resistance of graphene to be obtained, paving the pathway for characterization of graphene conductivity with a sub-100 nm special resolution.

Tselev, Alexander [ORNL; Lavrik, Nickolay V [ORNL; Vlassiouk, Ivan V [ORNL; Briggs, Dayrl P [ORNL; Rutgers, Maarten [Asylum Research, Santa Barbara, CA; Proksch, Roger [Asylum Research, Santa Barbara, CA; Kalinin, Sergei V [ORNL

2012-01-01T23:59:59.000Z

392

Plasmonic Field Enhancement of Individual Nanoparticles by Correlated Scanning and Photoemission Electron Microscopy  

SciTech Connect

We present results of a combined two-photon photoemission and scanning electron microscopy investigation to determine the electromagnetic enhancement factors of silver-coated spherical nanoparticles deposited on an atomically flat mica substrate. Femtosecond laser excitation, of the nanoparticles, produces intense photoemission, attributed to near-resonant excitation of localized surface plasmons. Enhancement factors are determined by comparing the respective two-photon photoemission yield measured for equal areas between single nanoparticles to that of the surrounding flat surface. For s-polarized, 400 nm (~ 3.1 eV) femtosecond radiation a distribution of enhancement factors are found with a large percentage (77%) of the nanoparticles falling within a median range. A correlated scanning electron microscopy analysis demonstrated that the nanoparticles typifying the median of the distribution were characterized by ideal spherical shapes and defect-free morphologies. The single largest enhancement factors were in contrast produced by a very small percentage (8%) of the total, for which evidence of silver defect anomalies were found that contributed to the overall structure of the nanoparticle. Comparisons are made between the experimentally measured enhancement factors and previously reported theoretical predictions of the localized surface plasmon near-field intensities for isolated nanometer-sized silver spheres.

Peppernick, Samuel J.; Joly, Alan G.; Beck, Kenneth M.; Hess, Wayne P.

2011-01-21T23:59:59.000Z

393

Scanning Hall Probe Microscopy of Magnetic Vortices inVery Underdoped yttrium-barium-copper-oxide  

Science Conference Proceedings (OSTI)

Since their discovery by Bednorz and Mueller (1986), high-temperature cuprate superconductors have been the subject of intense experimental research and theoretical work. Despite this large-scale effort, agreement on the mechanism of high-T{sub c} has not been reached. Many theories make their strongest predictions for underdoped superconductors with very low superfluid density n{sub s}/m*. For this dissertation I implemented a scanning Hall probe microscope and used it to study magnetic vortices in newly available single crystals of very underdoped YBa{sub 2}Cu{sub 3}O{sub 6+x} (Liang et al. 1998, 2002). These studies have disproved a promising theory of spin-charge separation, measured the apparent vortex size (an upper bound on the penetration depth {lambda}{sub ab}), and revealed an intriguing phenomenon of ''split'' vortices. Scanning Hall probe microscopy is a non-invasive and direct method for magnetic field imaging. It is one of the few techniques capable of submicron spatial resolution coupled with sub-{Phi}{sub 0} (flux quantum) sensitivity, and it operates over a wide temperature range. Chapter 2 introduces the variable temperature scanning microscope and discusses the scanning Hall probe set-up and scanner characterizations. Chapter 3 details my fabrication of submicron GaAs/AlGaAs Hall probes and discusses noise studies for a range of probe sizes, which suggest that sub-100 nm probes could be made without compromising flux sensitivity. The subsequent chapters detail scanning Hall probe (and SQUID) microscopy studies of very underdoped YBa{sub 2}Cu{sub 3}O{sub 6+x} crystals with T{sub c} {le} 15 K. Chapter 4 describes two experimental tests for visons, essential excitations of a spin-charge separation theory proposed by Senthil and Fisher (2000, 2001b). We searched for predicted hc/e vortices (Wynn et al. 2001) and a vortex memory effect (Bonn et al. 2001) with null results, placing upper bounds on the vison energy inconsistent with the theory. Chapter 5 discusses imaging of isolated vortices as a function of T{sub c}. Vortex images were fit with theoretical magnetic field profiles in order to extract the apparent vortex size. The data for the lowest T{sub c}'s (5 and 6.5 K) show some inhomogeneity and suggest that {lambda}{sub ab} might be larger than predicted by the T{sub c} {proportional_to} n{sub s}(0)/m* relation first suggested by results of Uemura et al. (1989) for underdoped cuprates. Finally, Chapter 6 examines observations of apparent ''partial vortices'' in the crystals. My studies of these features indicate that they are likely split pancake vortex stacks. Qualitatively, these split stacks reveal information about pinning and anisotropy in the samples. Collectively these magnetic imaging studies deepen our knowledge of cuprate superconductivity, especially in the important regime of low superfluid density.

Guikema, Janice Wynn; /SLAC, SSRL

2005-12-02T23:59:59.000Z

394

An Evaluation of Radar Rainfall Estimates from Specific Differential Phase  

Science Conference Proceedings (OSTI)

Specific differential propagation phase (KDP) is examined for estimating convective rainfall in Colorado and Kansas. Estimates are made at S band with KDP alone and in combination with radar reflectivity (ZH). Results are compared to gauge ...

Edward A. Brandes; Alexander V. Ryzhkov; Dus?an S. Zrni?

2001-03-01T23:59:59.000Z

395

Calibrating Differential Reflectivity on the WSR-88D  

Science Conference Proceedings (OSTI)

A calibration procedure of differential reflectivity on the Weather Surveillance Radar-1988 Doppler (WSR-88D) is described. It has been tested on NOAA's modified WSR-88D research and development polarimetric radar and is directly applicable to ...

Dusan S. Zrnic; Valery M. Melnikov; John K. Carter

2006-07-01T23:59:59.000Z

396

Automatic differentiation for optimum design, applied to sonic boom reduction  

Science Conference Proceedings (OSTI)

We propose a methodology for adjoint-based optimum design that combines hand-coding with Automatic Differentiation in the reverse mode, therefore managing to keep the memory cost acceptable. This methodology also involves improvements to the reverse ...

Laurent Hascoët; Mariano Vázquez; Alain Dervieux

2003-05-01T23:59:59.000Z

397

A Robust Estimator of Rainfall Rate Using Differential Reflectivity  

Science Conference Proceedings (OSTI)

Conventional estimator of rainfall rate using reflectivity factor and differential reflectivity ZDR becomes unstable when the measured values of ZDR are small due to measurement errors. An alternate estimator of rainfall rate using reflectivity ...

Eugenio Gorgucca; Gianfranco Scarchilli; V. Chandrasekar

1994-04-01T23:59:59.000Z

398

Dependence of Differential Mixing on N and R?  

Science Conference Proceedings (OSTI)

Mechanisms and parameter dependence of differential mixing of heat and salt by ocean turbulence are investigated numerically by extending a previous study to examine dependence upon buoyancy frequency N and density gradient ratio R?. In these ...

William J. Merryfield

2005-06-01T23:59:59.000Z

399

Bunches of differential forms and the Einstein equation  

SciTech Connect

A technique is developed for investigating the vacuum Einstein equation by the use of bunches of differential forms. A connection is established between this method and the twistors of Penrose and the wrench functions of Plebanski.

Gindikin, S.G.

1982-08-01T23:59:59.000Z

400

Algorithm for Estimation of the Specific Differential Phase  

Science Conference Proceedings (OSTI)

The specific differential phase Kdp is one of the important parameters measured by dual-polarization radar that is being considered for the upgrade of the current Next Generation Weather Radar (NEXRAD) system. Estimation of the specific ...

Yanting Wang; V. Chandrasekar

2009-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "differential scanning calorimetry" 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

Annex I differentiation proposals : implications for welfare, equity and policy  

E-Print Network (OSTI)

Drawing upon a variety of different criteria, many nations have introduced proposals to differentiate the reductions in carbon emissions that would be required of industrialized nations in the short to medium term. This ...

Reiner, David M.; Jacoby, Henry D.

402

A Two-bit Differentiated Services Architecture for the Internet  

Science Conference Proceedings (OSTI)

This document was originally submitted as an internet draft in November of 1997. As one of the documents predating the formation of the IETF's Differentiated Services Working Group, many of the ideas presented here, in concert with Dave Clark's subsequent ...

K. Nichols; V. Jacobson; L. Zhang

1999-07-01T23:59:59.000Z

403

A New Relationship between Mean Doppler Velocity and Differential Reflectivity  

Science Conference Proceedings (OSTI)

A new relationship has been established linking the vertical mean Doppler velocity of raindrop spectra and the accompanying differential reflectivities. It is based upon the specific radar combination of a vertically pointing Doppler and a ...

Matthias Steiner

1991-06-01T23:59:59.000Z

404

DES and Differential Power Analysis (The "Duplication" Method)  

Science Conference Proceedings (OSTI)

Paul Kocher recently developped attacks based on the electric consumption of chips that perform cryptographic computations. Among those attacks, the "Differential Power Analysis" (DPA) is probably one of the most impressive and most difficult to avoid.In ...

Louis Goubin; Jacques Patarin

1999-08-01T23:59:59.000Z

405

Microgrid Fault Protection Based on Symmetrical and Differential Current Components  

E-Print Network (OSTI)

Microgrid Fault Protection Based on Symmetrical and Differential Current Components Prepared.........................................................................................8 2. AEP CERTS MICROGRID .........................................................................9 ........................................................................67 #12;3 Index of Figures Figure 1: Schematic representation of the AEP CERTS microgrid

406

DEGENERATE-PARABOLIC PARTIAL DIFFERENTIAL EQUATIONS WITH UNBOUNDED COEFFICIENTS, MARTINGALE PROBLEMS, AND A  

E-Print Network (OSTI)

DEGENERATE-PARABOLIC PARTIAL DIFFERENTIAL EQUATIONS WITH UNBOUNDED COEFFICIENTS, MARTINGALE four intertwined problems, motivated by mathematical finance, concerning degenerate-parabolic partial differential operators and degenerate diffusion processes. First, we consider a parabolic partial differential

407

International Conference on Multiscale Methods and Partial Differential Equations.  

SciTech Connect

The International Conference on Multiscale Methods and Partial Differential Equations (ICMMPDE for short) was held at IPAM, UCLA on August 26-27, 2005. The conference brought together researchers, students and practitioners with interest in the theoretical, computational and practical aspects of multiscale problems and related partial differential equations. The conference provided a forum to exchange and stimulate new ideas from different disciplines, and to formulate new challenging multiscale problems that will have impact in applications.

Thomas Hou

2006-12-12T23:59:59.000Z

408

Effect of resveratrol on proliferation and differentiation of embryonic cardiomyoblasts  

SciTech Connect

Resveratrol (trans-3,5,4'-trihydroxystilbene), a polyphenolic compound found largely in the skins of red grapes, has been used as a nutritional supplement or an investigational new drug for prevention of cardiovascular diseases. Previous reports showed that resveratrol had a protective effect against oxidative agent-induced cell injury. Our studies indicate that resveratrol plays a role in the differentiation of cardiomyoblasts. The cardiomyoblast cell line, H9c2, was exposed to 30-120 {mu}M resveratrol for up to 5 days. Resveratrol inhibits cardiomyoblast proliferation without causing cells injury. Moreover, resveratrol treatment modulated the differentiation of morphological characteristics including elongation and cell fusion in cardiomyoblasts. Proliferation and differentiation of H9c2 cells were further revealed by measurement of the mRNA expression of a cell cycle marker (CDK2), a differentiation marker (myogenin), and a contractile apparatus protein (MLC-2). Gene expression analysis revealed that resveratrol promoted entry into cell cycle arrest but extended the myogenic differentiation progress. These results have implications for the role of resveratrol in modulating cell cycle control and differentiation in cardiomyoblasts.

Leong, C.-W. [Institute of Chinese Medical Sciences, University of Macau, Taipa, Macao (China); Wong, C.H. [Department of Biochemistry, Chinese University of Hong Kong, Hong Kong (China); Lao, S.-C. [Institute of Chinese Medical Sciences, University of Macau, Taipa, Macao (China); Leong, Emilia Conceicao [Institute of Chinese Medical Sciences, University of Macau, Taipa, Macao (China); Lao, Iok Fong [Institute of Chinese Medical Sciences, University of Macau, Taipa, Macao (China); Law, Patrick Tik Wan [Department of Biochemistry, Chinese University of Hong Kong, Hong Kong (China); Fung, Kwok Pui [Department of Biochemistry, Chinese University of Hong Kong, Hong Kong (China); Institute of Chinese Medicine, Chinese University of Hong Kong, Hong Kong (China); Tsang, Kam Sze [Department of Anatomical and Cellular Pathology, Chinese University of Hong Kong, Hong Kong (China); Waye, Mary Miu-Yee [Department of Biochemistry, Chinese University of Hong Kong, Hong Kong (China); Tsui, Stephen Kwok-Wing [Department of Biochemistry, Chinese University of Hong Kong, Hong Kong (China); Wang Yitao [Institute of Chinese Medical Sciences, University of Macau, Taipa, Macao (China)]. E-mail: YTWang@umac.mo; Lee, Simon Ming-Yuen [Institute of Chinese Medical Sciences, University of Macau, Taipa, Macao (China) and Institute of Chinese Medicine, Chinese University of Hong Kong, Hong Kong (China)]. E-mail: simonlee@umac.mo

2007-08-17T23:59:59.000Z

409

Beam Energy Scan program at RHIC-experimental approach to the QCD Phase Diagram  

SciTech Connect

The Beam Energy Scan (BES) program at RHIC was launched with the specific aim to explore the QCD (Quantum Chromodynamics) Phase Diagram. Particular emphasis was given to the search for phase boundaries and the location of the Critical Point (CP). The first run with AuAu collisions at 7.7, 11.5, and 39 GeV took place in 2010, and the next one, with energies of 18 and 27 GeV, will start in a few months. The results of the first stage of the BES program obtained by the STAR (Solenoidal Tracker at RHIC) experiment are presented and discussed, as well as plans for the future of the program.

Odyniec, G., E-mail: G_Odyniec@lbl.gov [Lawrence Berkeley National Laboratory (United States)

2012-05-15T23:59:59.000Z

410

Scanning tunneling microscopy reveals LiMnAs is a room temperature anti-ferromagnetic semiconductor  

SciTech Connect

We performed scanning tunneling microscopy and spectroscopy on a LiMnAs(001) thin film epitaxially grown on an InAs(001) substrate by molecular beam epitaxy. While the in situ cleavage exposed only the InAs(110) non-polar planes, the cleavage continued into the LiMnAs thin layer across several facets. We combined both topography and current mappings to confirm that the facets correspond to LiMnAs. By spectroscopy we show that LiMnAs has a band gap. The band gap evidenced in this study, combined with the known Neel temperature well above room temperature, confirms that LiMnAs is a promising candidate for exploring the concepts of high temperature semiconductor spintronics based on antiferromagnets.

Wijnheijmer, A. P.; Koenraad, P. M. [COBRA Inter-University Research Institute, Department of Applied Physics, Eindhoven University of Technology, P. O. Box 513, NL-5600 MB Eindhoven (Netherlands); Marti, X. [Faculty of Mathematics and Physics, Charles University in Prague, Ke Karlovu 3, 121 16 Prague 2 (Czech Republic); Institute of Physics ASCR, v.v.i., Cukrovarnicka 10, 162 53 Prague 6 (Czech Republic); Holy, V. [Faculty of Mathematics and Physics, Charles University in Prague, Ke Karlovu 3, 121 16 Prague 2 (Czech Republic); Cukr, M.; Novak, V. [Institute of Physics ASCR, v.v.i., Cukrovarnicka 10, 162 53 Prague 6 (Czech Republic); Jungwirth, T. [Institute of Physics ASCR, v.v.i., Cukrovarnicka 10, 162 53 Prague 6 (Czech Republic); School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD (United Kingdom)

2012-03-12T23:59:59.000Z

411

Posters Scanning Raman Lidar Measurements of Atmospheric Water Vapor and Aerosols  

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

5 5 Posters Scanning Raman Lidar Measurements of Atmospheric Water Vapor and Aerosols R. A. Ferrare and K. D. Evans (a) Hughes STX Corporation Lanham, Maryland S. H. Melfi and D. N. Whiteman NASA/Goddard Space Flight Center Greenbelt, Maryland The principal objective of the Department of Energy's (DOE) Atmospheric Radiation Measurement Program (ARM) is to develop a better understanding of the atmospheric radiative balance in order to improve the parameterization of radiative processes in general circulation models (GCMs) which are used to study climate change. Meeting this objective requires detailed measurements of both water vapor and aerosols since these atmospheric constituents affect the radiation balance directly, through scattering and absorption of solar and

412

A Scanning Electron Microscope Facility for Characterization of Tritium Containing Materials  

SciTech Connect

A scanning electron microscope (SEM) facility for the examination of tritium-containing materials is operational at Mound Laboratory. The SEM is installed with the sample chamber incorporated as an integral part of an inert gas glovebox facility to enable easy handling of radioactive and pyrophoric materials. A standard SEM (ERTEC Model B-1) was modified to meet dimensional, operational, and safety-related requirements. A glovebox was designed and fabricated which permitted access with the gloves to all parts of the SEM sample chamber to facilitate detector and accessory replacement and repairs. A separate console combining the electron optical column and specimen chamber was interfaced to the glovebox by a custom-made, neoprene bellows so that the vibrations normally associated with the blowers and pumps were damped. Photomicrographs of tritiated pyrophoric materials show the usefulness of this facility. Some of the difficulties involved in the investigation of these materials are also discussed.

Downs, G. L.; Tucker, P. A.

1975-10-01T23:59:59.000Z

413

GAMMA-RAY SCANNING TECHNIQUES FOR FAST BREEDER REACTOR SAFETY STUDIES  

SciTech Connect

A radiation scanning device was constructed to observe meltdown of fast breeder reactor fuel elements in the TREAT reactor by means of self gamma emission. Although the original desired specification was to view natural uranium pins with a space resolution of 0.1 in. and a time resolution of 1 millisecond, the system was designed to give the above space resolution, but the time resolution would be 5 milliseconds or longer depending on the signal intensity. The system failed to give satisfactory pictures because of low signal strength which gave poor contrast against high-strength background from the container required for safety reasons. Measurements indicated that a Mark III system could be constructed to view enriched pins in the standard container with a space resolution of 0.15 in. horizontally and 0.75 in. vertically with a time resolution of 5 milliseconds. (auth)

Beach, L.A.; Pieper, A.G.; Young, M.P.

1961-04-01T23:59:59.000Z

414

Hydrogen adsorption on Ru(001) studied by Scanning TunnelingMicroscopy  

SciTech Connect

The adsorption of hydrogen on Ru(001) was studied by scanning tunneling microscopy at temperatures around 50 K. Hydrogen was found to adsorb dissociatively forming different ordered structures as a function of coverage. In order of increasing coverage {theta} in monolayers (ML) these were ({radical}3 x {radical}3)r30{sup o} at {theta} = 0.3 ML; (2 x 1) at {theta} = 0.50 ML, (2 x 2)-3H at {theta} = 0.75, and (1 x 1) at {theta} = 1.00. Some of these structures were observed to coexist at intermediate coverage values. Close to saturation of 1 ML, H-vacancies (unoccupied three fold fcc hollow Ru sites) were observed either as single entities or forming transient aggregations. These vacancies diffuse and aggregate to form active sites for the dissociative adsorption of hydrogen.

Tatarkhanov, Mous; Rose, Franck; Fomin, Evgeny; Ogletree, D.Frank; Salmeron, Miquel

2008-01-18T23:59:59.000Z

415

New Binary and Millisecond Pulsars from Arecibo Drift-Scan Searches  

E-Print Network (OSTI)

We discuss four recycled pulsars found in Arecibo drift-scan searches. PSR J1944+0907 has a spin period of 5.2 ms and is isolated. The 5.8-ms pulsar J1453+19 may have a low-mass companion. We discuss these pulsars in the context of isolated millisecond pulsar formation and the minimum spin period of neutron stars. The isolated 56-ms pulsar J0609+2130 is possibly the remnant of a disrupted double neutron star binary. The 41-ms pulsar J1829+2456 is in a relativistic orbit. Its companion is most likely another neutron star, making this the eighth known double neutron star binary system.

M. A. McLaughlin; D. R. Lorimer; D. J. Champion; Z. Arzoumanian; D. C. Backer; J. M. Cordes; A. S. Fruchter; A. N. Lommen; K. M. Xilouris

2004-04-08T23:59:59.000Z

416

Novel Scanning Lens Instrument for Evaluating Fresnel Lens Performance: Equipment Development and Initial Results (Presentation)  

SciTech Connect

A system dedicated to the optical transmittance characterization of Fresnel lenses has been developed at NREL, in collaboration with the UPM. The system quantifies the optical efficiency of the lens by generating a performance map. The shape of the focused spot may also be analyzed to understand change in the lens performance. The primary instrument components (lasers and CCD detector) have been characterized to confirm their capability for performing optical transmittance measurements. Measurements performed on SoG and PMMA lenses subject to a variety of indoor conditions (e.g., UV and damp heat) identified differences in the optical efficiency of the evaluated lenses, demonstrating the ability of the Scanning Lens Instrument (SLI) to distinguish between the aged lenses.

Herrero, R.; Miller, D. C.; Kurtz, S. R.; Anton, I.; Sala, G.

2013-07-01T23:59:59.000Z

417

Scanning transmission electron microscopy strain measurement from millisecond frames of a direct electron charge coupled device  

Science Conference Proceedings (OSTI)

A high-speed direct electron detection system is introduced to the field of transmission electron microscopy and applied to strain measurements in semiconductor nanostructures. In particular, a focused electron probe with a diameter of 0.5 nm was scanned over a fourfold quantum layer stack with alternating compressive and tensile strain and diffracted discs have been recorded on a scintillator-free direct electron detector with a frame time of 1 ms. We show that the applied algorithms can accurately detect Bragg beam positions despite a significant point spread each 300 kV electron causes during detection on the scintillator-free camera. For millisecond exposures, we find that strain can be measured with a precision of 1.3 Multiplication-Sign 10{sup -3}, enabling, e.g., strain mapping in a 100 Multiplication-Sign 100 nm{sup 2} region with 0.5 nm resolution in 40 s.

Mueller, Knut; Rosenauer, Andreas [Institut fuer Festkoerperphysik, Universitaet Bremen, Otto-Hahn-Allee 1, 28359 Bremen (Germany); Ryll, Henning; Ordavo, Ivan; Ihle, Sebastian; Soltau, Heike [PNSensor GmbH, Roemerstrasse 28, 80803 Muenchen (Germany); Strueder, Lothar [Max-Planck-Institut Halbleiterlabor, Otto-Hahn-Ring 6, 81739 Muenchen (Germany); Volz, Kerstin [Materials Science Center and Faculty of Physics, Philipps Universitaet Marburg, Hans-Meerwein-Strasse, 35032 Marburg (Germany); Zweck, Josef [Institut fuer Experimentelle und Angewandte Physik, Universitaet Regensburg, Universitaetsstrasse 31, 93040 Regensburg (Germany)

2012-11-19T23:59:59.000Z

418

Sub-0.1 nm-resolution quantitative scanning transmission electron microscopy without adjustable parameters  

Science Conference Proceedings (OSTI)

Atomic-resolution imaging in the scanning transmission electron microscope (STEM) constitutes a powerful tool for nanostructure characterization. Here, we demonstrate the quantitative interpretation of atomic-resolution high-angle annular dark-field (ADF) STEM images using an approach that does not rely on adjustable parameters. We measure independently the instrumental parameters that affect sub-0.1 nm-resolution ADF images, quantify their individual and collective contributions to the image intensity, and show that knowledge of these parameters enables a quantitative interpretation of the absolute intensity and contrast across all accessible spatial frequencies. The analysis also provides a method for the in-situ measurement of the STEM's effective source distribution.

Dwyer, C. [Monash Centre for Electron Microscopy, Monash University, Victoria 3800 (Australia); Department of Materials Engineering, Monash University, Victoria 3800 (Australia); ARC Centre of Excellence for Design in Light Metals, Monash University, Victoria 3800 (Australia); Maunders, C. [Department of Materials Engineering, Monash University, Victoria 3800 (Australia); Zheng, C. L. [Monash Centre for Electron Microscopy, Monash University, Victoria 3800 (Australia); Weyland, M.; Etheridge, J. [Monash Centre for Electron Microscopy, Monash University, Victoria 3800 (Australia); Department of Materials Engineering, Monash University, Victoria 3800 (Australia); Tiemeijer, P. C. [FEI Electron Optics, P.O. Box 80066, 5600 KA Eindhoven (Netherlands)

2012-05-07T23:59:59.000Z

419

Direct x-ray response of self-scanning photodiode arrays  

SciTech Connect

Self-scanning photodiode arrays were tested for their ability to measure the spatial distribution of low-energy x rays in a wavelength-dispersive spectrometer. X-ray spectral sensitivity was measured with a calibrated dc source of nearly-monochromatic characteristic-x rays with photon energies in the range of 1.5 to 8 keV. Photodiode response was found to be linear with x-ray flux. Exposure to large doses of copper radiation did not affect sensitivity. A mathematical model that describes the experimental data is presented. It was found that spatial resolving power was lowered by the dispersal of photogenerated charges. This effect was investigated with collimated beams and is described with a formula that predicts the loss of diode signals. (auth)

Koppel, L.N.

1975-08-13T23:59:59.000Z

420

Ultrasonic probe deployment device for increased wave transmission and rapid area scan inspections  

DOE Patents (OSTI)

An ultrasonic probe deployment device in which an ultrasound-transmitting liquid forms the portion of the ultrasonic wave path in contact with the surface being inspected (i.e., the inspection surface). A seal constrains flow of the liquid, for example preventing the liquid from surging out and flooding the inspection surface. The seal is not rigid and conforms to variations in the shape and unevenness of the inspection surface, thus forming a seal (although possibly a leaky seal) around the liquid. The probe preferably is held in place to produce optimum ultrasonic focus on the area of interest. Use of encoders can facilitate the production of C-scan area maps of the material being inspected.

DiMambro, Joseph; Roach, Dennis P; Rackow, Kirk A; Nelson, Ciji L; Dasch, Cameron J; Moore, David G

2013-02-12T23:59:59.000Z

Note: This page contains sample records for the topic "differential scanning calorimetry" 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

Ultrasonic probe deployment device for increased wave transmission and rapid area scan inspections  

DOE Patents (OSTI)

An ultrasonic probe deployment device in which an ultrasound-transmitting liquid forms the portion of the ultrasonic wave path in contact with the surface being inspected (i.e., the inspection surface). A seal constrains flow of the liquid, for example preventing the liquid from surging out and flooding the inspection surface. The seal is not rigid and conforms to variations in the shape and unevenness of the inspection surface, thus forming a seal (although possibly a leaky seal) around the liquid. The probe preferably is held in place to produce optimum ultrasonic focus on the area of interest. Use of encoders can facilitate the production of C-scan area maps of the material being inspected.

DiMambro, Joseph (Placitas, NM); Roach, Dennis P. (Albuquerque, NM); Rackow, Kirk A. (Albuquerque, NM); Nelson, Ciji L. (Albuquerque, NM); Dasch, Cameron J. (Boomfield Hills, MI); Moore, David G. (Albuquerque, NM)

2012-01-03T23:59:59.000Z

422

Low Temperature Scanning Force Microscopy of the Si(111)-( 7x7) Surface  

Science Conference Proceedings (OSTI)

A low temperature scanning force microscope (SFM) operating in a dynamic mode in ultrahigh vacuum was used to study the Si(111)-(7x7) surface at 7.2 K. Not only the twelve adatoms but also the six rest atoms of the unit cell are clearly resolved for the first time with SFM. In addition, the first measurements of the short range chemical bonding forces above specific atomic sites are presented. The data are in good agreement with first principles computations and indicate that the nearest atoms in the tip and sample relax significantly when the tip is within a few Angstrom of the surface. (c) 2000 The American Physical Society.

Lantz, M. A. [Institute of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, (Switzerland); Hug, H. J. [Institute of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, (Switzerland); Schendel, P. J. A. van [Institute of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, (Switzerland); Hoffmann, R. [Institute of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, (Switzerland); Martin, S. [Institute of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, (Switzerland); Baratoff, A. [Institute of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, (Switzerland); Abdurixit, A. [Institute of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, (Switzerland); Guentherodt, H.-J. [Institute of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, (Switzerland); Gerber, Ch. [IBM Research Division, Zuerich Research Laboratory, Saeumerstrasse 4, CH-8803 Rueschlikon, (Switzerland)

2000-03-20T23:59:59.000Z

423

Scanning Transmission X-ray Microscopy: Applications in Atmospheric Aerosol Research  

Science Conference Proceedings (OSTI)

Scanning transmission x-ray microscopy (STXM) combines x-ray microscopy and near edge x-ray absorption fine structure spectroscopy (NEXAFS). This combination provides spatially resolved bonding and oxidation state information. While there are reviews relevant to STXM/NEXAFS applications in other environmental fields (and magnetic materials) this chapter focuses on atmospheric aerosols. It provides an introduction to this technique in a manner approachable to non-experts. It begins with relevant background information on synchrotron radiation sources and a description of NEXAFS spectroscopy. The bulk of the chapter provides a survey of STXM/NEXAFS aerosol studies and is organized according to the type of aerosol investigated. The purpose is to illustrate the current range and recent growth of scientific investigations employing STXM-NEXAFS to probe atmospheric aerosol morphology, surface coatings, mixing states, and atmospheric processing.

Moffet, Ryan C.; Tivanski, Alexei V.; Gilles, Mary K.

2011-01-20T23:59:59.000Z

424

Measurements of Wind and Turbulence Profiles with Scanning Doppler Lidar for Wind Energy Applications  

SciTech Connect

High-quality profiles of mean and turbulent statistics of the wind field upstream of a wind farm can be produced using a scanning Doppler lidar. Careful corrections for the spatial filtering of the wind field by the lidar pulse produce turbulence estimates equivalent to point sensors but with the added advantage of a larger sampling volume to increase the statistical accuracy of the estimates. For a well-designed lidar system, this permits accurate estimates of the key turbulent statistics over various subdomains and with sufficiently short observation times to monitor rapid changes in conditions. These features may be ideally suited for optimal operation of wind farms and also for improved resource assessment of potential sites.

Frehlich, R.; Kelley, N.

2008-03-01T23:59:59.000Z

425

Determination of accuracy of measurements by NREL's Scanning Hartmann Optical Test instrument  

DOE Green Energy (OSTI)

NREL's Scanning Hartmann Optical Test (SHOT) instrument is routinely used to characterize the surface of candidate dish concentration elements for solar thermal applications. An approach was devised to quantify the accuracy of these measurements. Excellent reproducibility was exhibited and high confidence established. The SHOT instrument was designed to allow the surface figure of large optical test articles to be accurately specified. Such test articles are nominally parabolic with an f/D ratio (in which f=focal length and D=aperture diameter) in the range of 0.5--1.0. Recent modifications of SHOT have extended the characterization range out to about f/D=3.0. A series of experiments was designed to investigate and quantify the uncertainties associated with optical characterization performed by SHOT. This approach involved making a series of measurements with an arbitrary test article positioned at a number of locations transverse to the optical axis of SHOT. 3 refs.

Jorgensen, G.; Wendelin, T.; Carasso, M.

1991-04-01T23:59:59.000Z

426

Determination of accuracy of measurements by NREL`s Scanning Hartmann Optical Test instrument  

DOE Green Energy (OSTI)

NREL`s Scanning Hartmann Optical Test (SHOT) instrument is routinely used to characterize the surface of candidate dish concentration elements for solar thermal applications. An approach was devised to quantify the accuracy of these measurements. Excellent reproducibility was exhibited and high confidence established. The SHOT instrument was designed to allow the surface figure of large optical test articles to be accurately specified. Such test articles are nominally parabolic with an f/D ratio (in which f=focal length and D=aperture diameter) in the range of 0.5--1.0. Recent modifications of SHOT have extended the characterization range out to about f/D=3.0. A series of experiments was designed to investigate and quantify the uncertainties associated with optical characterization performed by SHOT. This approach involved making a series of measurements with an arbitrary test article positioned at a number of locations transverse to the optical axis of SHOT. 3 refs.

Jorgensen, G.; Wendelin, T.; Carasso, M.

1991-04-01T23:59:59.000Z

427

Graphical template software for accurate micromanipulation in a scanning electron microscope  

SciTech Connect

Micromanipulation techniques in a scanning electron microscope (SEM) have been utilized for assembling micrometer-sized structures. The precision of the assembled microstructures has been limited by the poor accuracy of the SEM image. We have developed a software to assist the operator in the accurate assembly of microstructures in a SEM, in which computer-generated outlines of the target structure [graphical templates (GTs)] are superimposed on the monitor. The displayed GTs are distorted on the basis of the image properties of the SEM evaluated in advance. As a consequence, the operator can construct microstructures with a high precision only by maneuvering the manipulator so that the outline of each object perfectly overlaps the GT without any alteration of the electron optics or circuits for improving the image accuracy.

Kasaya, Takeshi [Nanotechnology Innovation Center, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047 (Japan); Miyazaki, Hideki T. [Quantum Dot Research Center, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047 (Japan)

2009-01-15T23:59:59.000Z

428

In situ nanomechanical testing in focused ion beam and scanning electron microscopes  

Science Conference Proceedings (OSTI)

The recent interest in size-dependent deformation of micro- and nanoscale materials has paralleled both technological miniaturization and advancements in imaging and small-scale mechanical testing methods. Here we describe a quantitative in situ nanomechanical testing approach adapted to a dual-beam focused ion beam and scanning electron microscope. A transducer based on a three-plate capacitor system is used for high-fidelity force and displacement measurements. Specimen manipulation, transfer, and alignment are performed using a manipulator, independently controlled positioners, and the focused ion beam. Gripping of specimens is achieved using electron-beam assisted Pt-organic deposition. Local strain measurements are obtained using digital image correlation of electron images taken during testing. Examples showing results for tensile testing of single-crystalline metallic nanowires and compression of nanoporous Au pillars will be presented in the context of size effects on mechanical behavior and highlight some of the challenges of conducting nanomechanical testing in vacuum environments.

Gianola, D. S. [Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104 (United States); Institute for Applied Materials, Karlsruhe Institute of Technology, Karlsruhe (Germany); Sedlmayr, A.; Moenig, R.; Kraft, O. [Institute for Applied Materials, Karlsruhe Institute of Technology, Karlsruhe (Germany); Volkert, C. A. [Institute for Materials Physics, Georg-August University of Goettingen, Goettingen (Germany); Major, R. C.; Cyrankowski, E.; Asif, S. A. S.; Warren, O. L. [Hysitron, Inc., Minneapolis, Minnesota 55344 (United States)

2011-06-15T23:59:59.000Z

429

Design of a Real-Time Scanning Electrical Mobility Spectrometer and its Application in Study of Nanoparticle Aerosol Generation  

E-Print Network (OSTI)

A real-time, mobile Scanning Electrical Mobility Spectrometer (SEMS) was designed using a Condensation Particle Counter (CPC) and Differential Mobility Analyzer (DMA) to measure the size distribution of nanoparticles. The SEMS was calibrated using monodisperse Polystyrene Latex (PSL) particles, and was then applied to study the size distribution of TiO2 nanoparticle aerosols generated by spray drying water suspensions of the nanoparticles. The nanoparticle aerosol size distribution, the effect of surfactant, and the effect of residual solvent droplets were determined. The SEMS system was designed by integrating the Electrical System, the Fluid Flow System, and the SEMS Software. It was calibrated using aerosolized Polystyrene Latex (PSL) spheres with nominal diameters of 99 nm and 204 nm. TiO2 nanoparticle aerosols were generated by atomizing water suspensions of TiO2 nanoparticles using a Collison nebulizer. Size distribution of the TiO2 aerosol was measured by the SEMS, as well as by TEM. Furthermore, the effect of surfactant, Tween 20 at four different concentrations between 0.01mM and 0.80mM, and stability of aerosol concentration with time were studied. It was hypothesized that residual particles in DI water observed during the calibration process were a mixture of impurities in water and unevaporated droplets. Solid impurities were captured on TEM grids using a point-to-plane Electrostatic Precipitator (ESP) and analyzed by Energy Dispersive Spectroscopy (EDS) while the contribution of unevaporated liquid droplets to residual particles was confirmed by size distribution measurements of aerosolized DI water in different humidity conditions. The calibration indicated that the mode diameter was found to be at 92.5nm by TEM and 95.8nm by the SEMS for 99nm nominal diameter particles, a difference of 3.6%. Similarly, the mode diameter for 204nm nominal diameter particles was found to be 194.9nm by TEM and 191nm by SEMS, a difference of 2.0%. Measurements by SEMS for TiO2 aerosol generated by Collison nebulizer indicated the mode diameters of 3mM, 6mM, and 9mM concentrations of TiO2 suspension to be 197.5nm, 200.0nm and 195.2nm respectively. On the other hand, the mode diameter was found to be approximately 95nm from TEM analysis of TiO2 powder. Additionally, concentration of particles generated decreased with time. Dynamic Light Scattering (DLS) measurements indicated agglomeration of particles in the suspension. Furthermore, the emulation of single particle distribution was not possible even after using Tween 20 in concentrations between 0.01mM and 0.80mM. From the study of residual particles in DI water, it was found that residual particles observed during the aerosolization of suspensions of DI water were composed of impurities present in DI water and unevaporated droplets of DI water. Although it was possible to observe solid residual particles on the TEM grid, EDS was not able to determine the chemical composition of these particles.

Singh, Gagan

2010-05-01T23:59:59.000Z

430

Case for an Improved Effective-Atomic-Number for the Electronic Baggage Scanning Program  

SciTech Connect

Z{sub eff}, a parameter representing an 'effective atomic number' for a material, plays an important role in the Electronic Baggage Scanning Program (EBSP) to detect threats in dual-energy computed tomography (CT) baggage-scanning systems. We believe that Z{sub eff}, as defined and used on this program, does not provide the accurate representation of a material's x-ray absorption properties that is needed by the EBSP. We present the case for a new method that defines an effective atomic number for compounds and mixtures, which we refer to as Z{sub e}. Unlike Z{sub eff}, Z{sub e} is tied by definition to the x-ray absorption properties of each specific material. Use of this alternative will provide a more accurate scale for calibrating Micro-CT and EDS systems against standard reference materials and will provide a more accurate physical characterization of the x-ray properties of materials evaluated on those systems. This document: (1) Describes the current usage of the Z{sub eff} parameter; (2) Details problems entailed in the use of the Z{sub eff} parameter; (3) Proposes a well-defined alternative - Z{sub e}; (4) Proposes and demonstrates an algorithm for optimally associating Z{sub e} with any specified compound or mixture; (5) Discusses issues that can impact the usefulness of an effective-Z model; and (6) Recommends that, in order that the chosen effective-Z parameter not materially impact the accuracy of data produced by the EBSP program, the use of Z{sub eff} be replaced by Z{sub e}.

Smith, J A; Martz, H E; Kallman, J S

2011-04-05T23:59:59.000Z

431

An Iterative Filtering Technique for the Analysis of Copolar Differential Phase and Dual-Frequency Radar Measurements  

Science Conference Proceedings (OSTI)

Copolar differential phase is composed of two components, namely, differential propagation phase and differential backscatter phase. To estimate specific differential phase KDP, these two phase components must first be separated when significant ...

J. Hubbert; V. N. Bringi

1995-06-01T23:59:59.000Z

432

2005 International Linear Collider Workshop- Stanford, U.S.A. Frequency Scanned Interferometry for ILC Tracker Alignment  

E-Print Network (OSTI)

In this paper, we report high-precision absolute distance and vibration measurements performed with frequency scanned interferometry using a pair of single-mode optical fibers. Absolute distance was determined by counting the interference fringes produced while scanning the laser frequency. A high-finesse Fabry-Perot interferometer was used to determine frequency changes during scanning. Two multiple-distance-measurement analysis techniques were developed to improve distance precision and to extract the amplitude and frequency of vibrations. Under laboratory conditions, measurement precision of ? 50 nm was achieved for absolute distances ranging from 0.1 meters to 0.7 meters by using the first multiple-distance-measurement technique. The second analysis technique has the capability to measure vibration frequencies ranging from 0.1 Hz to 100 Hz with amplitude as small as a few nanometers, without a priori knowledge. A possible optical alignment system for a silicon tracker is also presented. 1.

Hai-jun Yang; Sven Nyberg; Keith Riles

2005-01-01T23:59:59.000Z

433

Tracking Living Cells as They Differentiate in Real Time  

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

Tracking Living Cells as They Differentiate in Real Time Print Tracking Living Cells as They Differentiate in Real Time Print Protein phosphorylation regulates protein function in a cell, either activating or inactivating the proteins responsible for many cell functions ranging from cell proliferation to differentiation to metabolism to signaling, and even programmed cell death. This chemical process has been studied intensively, but until now it has been impossible to watch phosphorylation at the molecular level without damaging cells or interfering with the very processes being examined. Using ALS Infrared Beamline 1.4.3, a group of researchers led by Hoi-Ying Holman, director of the Berkeley Synchrotron Infrared Structural Biology program at the ALS, developed a new technique for monitoring protein phosphorylation inside living mammalian cells, enabling them to follow cellular chemical changes in real time, without bias.

434

Tracking Living Cells as They Differentiate in Real Time  

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

Tracking Living Cells as They Differentiate in Real Time Print Tracking Living Cells as They Differentiate in Real Time Print Protein phosphorylation regulates protein function in a cell, either activating or inactivating the proteins responsible for many cell functions ranging from cell proliferation to differentiation to metabolism to signaling, and even programmed cell death. This chemical process has been studied intensively, but until now it has been impossible to watch phosphorylation at the molecular level without damaging cells or interfering with the very processes being examined. Using ALS Infrared Beamline 1.4.3, a group of researchers led by Hoi-Ying Holman, director of the Berkeley Synchrotron Infrared Structural Biology program at the ALS, developed a new technique for monitoring protein phosphorylation inside living mammalian cells, enabling them to follow cellular chemical changes in real time, without bias.

435

Tracking Living Cells as They Differentiate in Real Time  

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

Tracking Living Cells as They Differentiate in Real Time Print Tracking Living Cells as They Differentiate in Real Time Print Protein phosphorylation regulates protein function in a cell, either activating or inactivating the proteins responsible for many cell functions ranging from cell proliferation to differentiation to metabolism to signaling, and even programmed cell death. This chemical process has been studied intensively, but until now it has been impossible to watch phosphorylation at the molecular level without damaging cells or interfering with the very processes being examined. Using ALS Infrared Beamline 1.4.3, a group of researchers led by Hoi-Ying Holman, director of the Berkeley Synchrotron Infrared Structural Biology program at the ALS, developed a new technique for monitoring protein phosphorylation inside living mammalian cells, enabling them to follow cellular chemical changes in real time, without bias.

436

Tracking Living Cells as They Differentiate in Real Time  

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

Tracking Living Cells as They Differentiate in Real Time Print Tracking Living Cells as They Differentiate in Real Time Print Protein phosphorylation regulates protein function in a cell, either activating or inactivating the proteins responsible for many cell functions ranging from cell proliferation to differentiation to metabolism to signaling, and even programmed cell death. This chemical process has been studied intensively, but until now it has been impossible to watch phosphorylation at the molecular level without damaging cells or interfering with the very processes being examined. Using ALS Infrared Beamline 1.4.3, a group of researchers led by Hoi-Ying Holman, director of the Berkeley Synchrotron Infrared Structural Biology program at the ALS, developed a new technique for monitoring protein phosphorylation inside living mammalian cells, enabling them to follow cellular chemical changes in real time, without bias.

437

Tracking Living Cells as They Differentiate in Real Time  

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

Tracking Living Cells as They Tracking Living Cells as They Differentiate in Real Time Tracking Living Cells as They Differentiate in Real Time Print Thursday, 27 September 2012 00:00 Protein phosphorylation regulates protein function in a cell, either activating or inactivating the proteins responsible for many cell functions ranging from cell proliferation to differentiation to metabolism to signaling, and even programmed cell death. This chemical process has been studied intensively, but until now it has been impossible to watch phosphorylation at the molecular level without damaging cells or interfering with the very processes being examined. Using ALS Infrared Beamline 1.4.3, a group of researchers led by Hoi-Ying Holman, director of the Berkeley Synchrotron Infrared Structural Biology program at the ALS, developed a new technique for monitoring protein phosphorylation inside living mammalian cells, enabling them to follow cellular chemical changes in real time, without bias.

438

Differential Microwave Radiometer and the Cosmic Microwave Background |  

Office of Science (SC) Website

Differential Differential Microwave Radiometer and the Cosmic Microwave Background Laboratory Policy and Evaluation (LPE) LPE Home Staff M&O Contracts SC Laboratory Appraisal Process Laboratory Planning Process Work for Others in the Office of Science Laboratory Directed Research and Development (LDRD) DOE's Philosophy on LDRD Frequently Asked Questions Success Stories Brochures Additional Information LDRD Program Contacts Technology Transfer DOE National Laboratories Contact Information Laboratory Policy and Evaluation U.S. Department of Energy SC-32/Forrestal Building 1000 Independence Ave., SW Washington, DC 20585 P: (202) 586-5447 F: (202) 586-3119 Success Stories Differential Microwave Radiometer and the Cosmic Microwave Background Print Text Size: A A A RSS Feeds FeedbackShare Page

439

Optimization of Pyrolysis of Biomass Using Differential Evolution Approach  

E-Print Network (OSTI)

Differential Evolution (DE) is an evolutionary optimization technique, which is exceptionally simple, significantly faster & robust at numerical optimization and is more likely to find a function’s true global optimum. Pyrolysis of biomass is an important and promising chemical process in the area of renewable energy sources. In the present study, the modeling and simulation of the above process is coupled with the optimization of a non-linear function using Differential Evolution. The objective in this problem is to estimate optimal time of pyrolysis and heating rate under the restriction on concentration of biomass. It serves as the input to the coupled ordinary differential equations to find the optimum values of volatiles and char using Runge-Kutta fourth order method. 1.

B. V. Babu; A. S. Chaurasia

2003-01-01T23:59:59.000Z

440

Measurement of the differential pressure of liquid metals  

DOE Patents (OSTI)

This patent relates to an improved means for measuring the differential pressure between any two points in a process liquid metal coolant loop, wherein the flow of liquid metal in a pipe is opposed by a permanent magnet liquid metal pump until there is almost zero flow shown by a magnetic type flowmeter. The pressure producing the liquid metal flow is inferred from the rate of rotation of the permanent magnet pump. In an alternate embodiment, a differential pressure transducer is coupled to a process pipeline by means of high-temperature bellows or diaphragm seals, and a permanent magnet liquid metal pump in the high-pressure transmission line to the pressure transducer can be utilized either for calibration of the transducer or for determining the process differential pressure as a function of the magnet pump speed. (auth)

Metz, H.J.

1975-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "differential scanning calorimetry" 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

Observations of chemical differentiation in clumpy molecular clouds  

E-Print Network (OSTI)

We have extensively mapped a sample of dense molecular clouds (L1512, TMC-1C, L1262, Per 7, L1389, L1251E) in lines of HC3N, CH3OH, SO and C^{18}O. We demonstrate that a high degree of chemical differentiation is present in all of the observed clouds. We analyse the molecular maps for each cloud, demonstrating a systematic chemical differentiation across the sample, which we relate to the evolutionary state of the cloud. We relate our observations to the cloud physical, kinematical and evolutionary properties, and also compare them to the predictions of simple chemical models. The implications of this work for understanding the origin of the clumpy structures and chemical differentiation observed in dense clouds are discussed.

J. V. Buckle; S. D. Rodgers; E. S. Wirström; S. B. Charnley; A. J. Markwick-Kemper; H. M. Butner; S. Takakuwa

2007-04-09T23:59:59.000Z

442

Atmospheric Precorrected Differential Absorption technique to retrieve columnar water vapor  

Science Conference Proceedings (OSTI)

Differential absorption techniques are suitable to retrieve the total column water vapor contents from imaging spectroscopy data. A technique called Atmospheric Precorrected Differential Absorption (APDA) is derived directly from simplified radiative transfer equations. It combines a partial atmospheric correction with a differential absorption technique. The atmospheric path radiance term is iteratively corrected during the retrieval of water vapor. This improves the results especially over low background albedos. The error of the method for various ground reflectance spectra is below 7% for most of the spectra. The channel combinations for two test cases are then defined, using a quantitative procedure, which is based on MODTRAN simulations and the image itself. An error analysis indicates that the influence of aerosols and channel calibration is minimal. The APDA technique is then applied to two AVIRIS images acquired in 1991 and 1995. The accuracy of the measured water vapor columns is within a range of {+-}5% compared to ground truth radiosonde data.

Schlaepfer, D.; Itten, K.I. [Univ. of Zuerich (Switzerland). Dept. of Geography] [Univ. of Zuerich (Switzerland). Dept. of Geography; Borel, C.C. [Los Alamos National Lab., NM (United States)] [Los Alamos National Lab., NM (United States); Keller, J. [Paul Scherrer Inst., Villigen (Switzerland)] [Paul Scherrer Inst., Villigen (Switzerland)

1998-09-01T23:59:59.000Z

443

High differential pressure, radial flow characteristics of gun perforations  

Science Conference Proceedings (OSTI)

Tubing conveyed completion techniques are being utilized more frequently than in the past, because of the apparent advantages derived from underbalanced perforating. These advantages include cleaner perforations, reductions of additional stimulation treatments and reduced completion times. This paper presents the results of a laboratory study of gun perforations made under high differential pressure, radial flow conditions. In this study, Berea sandstone cores, modified to permit radial flow, are used to determine the relationship between perforation characteristics and the time-dependent pressure differential between pore pressure (i.e. formation pressure) and ''well bore'' pressure during the completion process. The primary perforation characteristic investigated (Radial Flow Ratio) is defined as the ratio of the perforated flow rate to the flow rate of the unperforated core under identical conditions. The perforated flow rate is measured in radial flow after the perforation has been made under various time-dependent pressure differentials.

Regalbuto, J.A.; Riggs, R.S.

1985-01-01T23:59:59.000Z

444

High-Resolution Differential Ion Mobility Spectrometry of a Protein  

SciTech Connect

Use of elevated electric fields and helium-rich gases has recently enabled differential IMS with resolving power up to R ~ 300. Here we applied that technique to proteins (namely, mass-selected ubiquitin ions), achieving R up to ~80 and separating many previously mixed conformers. While still limited by conformational multiplicity within each observed feature, this resolution is some four times the highest previously reported using either conventional or differential IMS. The capability for fine resolution of protein conformers may open new avenues for variant separation in top-down proteomics.

Shvartsburg, Alexandre A.; Smith, Richard D.

2013-01-17T23:59:59.000Z

445

A differential rotation driven dynamo in a stably stratified star  

E-Print Network (OSTI)

We present numerical simulations of a self-sustaining magnetic field in a differentially rotating non-convective stellar interior. A weak initial field is wound up by the differential rotation; the resulting azimuthal field becomes unstable and produces a new meridional field component, which is then wound up anew, thus completing the `dynamo loop'. This effect is observed both with and without a stable stratification. A self-sustained field is actually obtained more easily in the presence of a stable stratification. The results confirm the analytical expectations of the role of Tayler instability.

J. Braithwaite; H. C. Spruit

2005-09-22T23:59:59.000Z

446

Integration of Global Positioning System and Scanning Water Vapor Radiometers for Precipitable Water Vapor and Cloud Liquid Path Estimates  

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

Integration of Global Positioning System and Scanning Integration of Global Positioning System and Scanning Water Vapor Radiometers for Precipitable Water Vapor and Cloud Liquid Path Estimates V. Mattioli and P. Basili Department of Electronic and Information Engineering University of Perugia Perugia, Italy E. R. Westwater Cooperative Institute for Research in Environmental Sciences University of Colorado National Oceanic and Atmospheric Administration Environmental Technology Laboratory Boulder, Colorado Introduction In recent years the Global Positioning System (GPS) has proved to be a reliable instrument for measuring precipitable water vapor (PWV) (Bevis et al. 1992), offering an independent source of information on water vapor when compared with microwave radiometers (MWRs), and/or radiosonde

447

On the complexity of solving ordinary differential equations in terms of Puiseux series  

E-Print Network (OSTI)

We prove that the binary complexity of solving ordinary polynomial differential equations in terms of Puiseux series is single exponential in the number of terms in the series. Such a bound was given by Grigoriev [10] for Riccatti differential polynomials associated to ordinary linear differential operators. In this paper, we get the same bound for arbitrary differential polynomials. The algorithm is based on a differential version of the Newton-Puiseux procedure for algebraic equations.

Ali Ayad

2007-05-15T23:59:59.000Z

448

CT Scan Not Only a Medical Technique NETL Wins Two 2008  

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

S . D e p a r t m e n t o f E n e r g y * O f f i c e o f F o s s i l E n e r g y * N a t i o n a l E n e r g y Te c h n o l o g y L a b o r a t o r y S . D e p a r t m e n t o f E n e r g y * O f f i c e o f F o s s i l E n e r g y * N a t i o n a l E n e r g y Te c h n o l o g y L a b o r a t o r y CT Scan Not Only a Medical Technique NETL Wins Two 2008 R&D 100 Awards First Measurements at Oxy-Fuel Flame Test Facility NETL's R&D newsletter January 2008 / issue 8 October 2008, Issue 11 CONTENTS Medical Technique Adopted to Study Mobility of CO 2 in Coal ____________________________________________ 2 Two Technologies Chosen for 2008 R&D 100 Awards _____ 3 Computer Code for Geologic Sequestration Modified for Parallel Computers ________________________________

449

Scanning tunneling microscopy observation of Pb-induced superstructures on Si(557)  

Science Conference Proceedings (OSTI)

Pb-induced superstructures on Si(557) are investigated by low-energy-electron diffraction (LEED) and scanning tunneling microscopy (STM). Using an indirect heating method, we have succeeded in obtaining almost perfect single-domain LEED patterns of one-dimensional wire (chain) structures, so called {alpha}x2 and {beta}x2 phases. Careful LEED analysis and STM investigation reveal that these phases are formed on the (223) and (112) facets, respectively. The {alpha}x2 phase has regular bundles of triple wires at low annealing temperature but wider bundles through step bunching after a higher temperature annealing. Along the wires of the {alpha}x2 phase, which was recently reported to exhibit a transition between one-dimensional (1D) metallic and 2D semiconducting conductance, a clear commensurate x2 modulation is observed at 78-120 K in contrast to the incommensurate and disordered structure reported previously. A tentative atomic structure model of the {alpha}x2 phase is proposed based on the dense Pb overlayers on (111) and (223) facets. The details of the STM images of the {beta}x2 phase are discussed.

Morikawa, Harumo; Kim, Keun Su; Jung, Duk Yong; Yeom, Han Woong [Institute of Physics and Applied Physics and Center for Atomic Wires and Layers, Yonsei University, 134 Shinchon, Seoul 120-749 (Korea, Republic of)

2007-10-15T23:59:59.000Z

450

Laser-assisted scanning probe alloying nanolithography (LASPAN) and its application in gold-silicon system  

E-Print Network (OSTI)

Nanoscale science and technology demand novel approaches and new knowledge to further advance. Nanoscale fabrication has been widely employed in both modern science and engineering. Micro/nano lithography is the most common technique to deposit nanostructures. Fundamental research is also being conducted to investigate structural, physical and chemical properties of the nanostructures. This research contributes fundamental understanding in surface science through development of a new methodology. Doing so, experimental approaches combined with energy analysis were carried out. A delicate hardware system was designed and constructed to realize the nanometer scale lithography. We developed a complete process, namely laser-assisted scanning probe alloying nanolithography (LASPAN), to fabricate well-defined nanostructures in gold-silicon (Au-Si) system. As a result, four aspects of nanostructures were made through different experimental trials. A non-equilibrium phase (AuSi3) was discovered, along with a non-equilibrium phase diagram. Energy dissipation and mechanism of nanocrystalization in the process have been extensively discussed. The mechanical energy input and laser radiation induced thermal energy input were estimated. An energy model was derived to represent the whole process of LASPAN.

Peng, Luohan

2008-08-01T23:59:59.000Z

451

Synthesis and characterization of carbon nanotubes using scanning probe based nano-lithographic techniques  

E-Print Network (OSTI)

A novel process which does not require the traditional Chemical Vapor Deposition (CVD) synthesis techniques and which works at temperatures lower than the conventional techniques was developed for synthesis of carbon nanotubes (CNT). The substrates used for this study involved MEMS (Micro Electrical Mechanical Systems) elements and passive elements. These were coated with Fullerene using Physical Vapor Deposition or through a solution in an organic solvent. Catalyst precursors were deposited on these Fullerene coated substrates using “wet processes”. These substrates were then heated using either the integrated microheaters or external heaters in an inert atmosphere to obtain CNT. Thus, in this process we tried to obviate the Chemical Vapor Deposition (CVD) process for synthesis of CNT (SWCNT and MWCNT). The synthesized CNT will be characterized using Scanning Electron Microscopy and Raman spectroscopy techniques. Also, conductivity measurements were carried out for the synthesized tubes using Dry (contact based) and Wet (electro-chemical) methods. This work also proves the concept for the feasibility for a portable hand held instrument for synthesis of CNT with tunable “on demand” chirality.

Gargate, Rohit Vasant

2008-12-01T23:59:59.000Z

452

Magnetic lens apparatus for use in high-resolution scanning electron microscopes and lithographic processes  

DOE Patents (OSTI)

Disclosed are lens apparatus in which a beam of charged particlesis brought to a focus by means of a magnetic field, the lens being situated behind the target position. In illustrative embodiments, a lens apparatus is employed in a scanning electron microscopeas the sole lens for high-resolution focusing of an electron beam, and in particular, an electron beam having an accelerating voltage of from about 10 to about 30,000 V. In one embodiment, the lens apparatus comprises an electrically-conducting coil arranged around the axis of the beam and a magnetic pole piece extending along the axis of the beam at least within the space surrounded by the coil. In other embodiments, the lens apparatus comprises a magnetic dipole or virtual magnetic monopole fabricated from a variety of materials, including permanent magnets, superconducting coils, and magnetizable spheres and needles contained within an energy-conducting coil. Multiple-array lens apparatus are also disclosed for simultaneous and/or consecutive imaging of multiple images on single or multiple specimens. The invention further provides apparatus, methods, and devices useful in focusing charged particle beams for lithographic processes.

Crewe, Albert V. (Dune Acres, IN)

2000-01-01T23:59:59.000Z

453

Atomic-Scale Imaging and Spectroscopy for In Situ Liquid Scanning Transmission Electron Microscopy  

Science Conference Proceedings (OSTI)

Observation of growth, synthesis, dynamics and electrochemical reactions in the liquid state is an important yet largely unstudied aspect of nanotechnology. The only techniques that can potentially provide the insights necessary to advance our understanding of these mechanisms is simultaneous atomic-scale imaging and quantitative chemical analysis (through spectroscopy) under environmental conditions in the transmission electron microscope (TEM). In this study we describe the experimental and technical conditions necessary to obtain electron energy loss (EEL) spectra from a nanoparticle in colloidal suspension using aberration corrected scanning transmission electron microscopy (STEM) combined with the environmental liquid stage. At a fluid path length below 400 nm, atomic resolution images can be obtained and simultaneous compositional analysis can be achieved. We show that EEL spectroscopy can be used to quantify the total fluid path length around the nanoparticle, and demonstrate characteristic core-loss signals from the suspended nanoparticles can be resolved and analyzed to provide information on the local interfacial chemistry with the surrounding environment. The combined approach using aberration corrected STEM and EEL spectra with the in situ fluid stage demonstrates a plenary platform for detailed investigations of solution based catalysis and biological research.

Jungjohann, K. L.; Evans, James E.; Aguiar, Jeff; Arslan, Ilke; Browning, Nigel D.

2012-06-04T23:59:59.000Z

454

Monitoring charge storage processes in nanoscale oxides using electrochemical scanning probe microscopy.  

Science Conference Proceedings (OSTI)

Advances in electrochemical energy storage science require the development of new or the refinement of existing in situ probes that can be used to establish structure - activity relationships for technologically relevant materials. The drive to develop reversible, high capacity electrodes from nanoscale building blocks creates an additional requirement for high spatial resolution probes to yield information of local structural, compositional, and electronic property changes as a function of the storage state of a material. In this paper, we describe a method for deconstructing a lithium ion battery positive electrode into its basic constituents of ion insertion host particles and a carbon current collector. This model system is then probed in an electrochemical environment using a combination of atomic force microscopy and tunneling spectroscopy to correlate local activity with morphological and electronic configurational changes. Cubic spinel Li{sub 1+x}Mn{sub 2-x}O{sub 4} nanoparticles are grown on graphite surfaces using vacuum deposition methods. The structure and composition of these particles are determined using transmission electron microscopy and Auger microprobe analysis. The response of these particles to initial de-lithiation, along with subsequent electrochemical cycling, is tracked using scanning probe microscopy techniques in polar aprotic electrolytes (lithium hexafluorophosphate in ethylene carbonate:diethylcarbonate). The relationship between nanoparticle size and reversible ion insertion activity will be a specific focus of this paper.

Zavadil, Kevin Robert; Lu, Ping; Huang, Jian Yu

2010-11-01T23:59:59.000Z

455

Area-Based Mapping of Defoliation of Scots Pine Stands Using Airborne Scanning LiDAR  

E-Print Network (OSTI)

Abstract: The mapping of changes in the distribution of insect-caused forest damage remains an important forest monitoring application and challenge. Efficient and accurate methods are required for mapping and monitoring changes in insect defoliation to inform forest management and reporting activities. In this research, we develop and evaluate a LiDAR-driven (Light Detection And Ranging) approach for mapping defoliation caused by the Common pine sawfly (Diprion pini L.). Our method requires plot-level training data and airborne scanning LiDAR data. The approach is predicated on a forest canopy mask created by detecting forest canopy cover using LiDAR. The LiDAR returns that are reflected from the canopy (that is, returns> half of maximum plot tree height) are used in the prediction of the defoliation. Predictions of defoliation are made at plot-level, which enables a direct integration of the method to operational forest management planning while also providing additional value-added from inventory-focused LiDAR datasets. In additionRemote Sens. 2013, 5 1221

Mikko Vastaranta; Tuula Kantola; Päivi Lyytikäinen-saarenmaa; Markus Holopainen; Ville Kankare; Michael A. Wulder

2013-01-01T23:59:59.000Z

456

Parallel implementation of fourth order block backward differentiation formulas for solving system of stiff ordinary differential equations  

Science Conference Proceedings (OSTI)

Parallel implementation of fourth order Block Backward Differentiation Formulas (BBDF(4)) is presented for a numerical solution of first order stiff ordinary differential equations (ODEs). This method computes the numerical solution at two points concurrently in each block. The sequential and parallel codes are developed on Message Passing Interface (MPI) library and run on High Performance Computing (HPC). The performance of this new method is measured in terms of Speedup (Sp ) and Efficiency (Ef ). It is shown that the parallel implementation BBDF(4) produced a better speed up compared to the sequential timing.

Zarina Bibi Ibrahim; Nor Ain Azeany Mohd Nasir; Khairil Iskandar Othman; Mohamed Suleiman

2013-01-01T23:59:59.000Z

457

Integrating a differential evolution feature weighting scheme into prototype generation  

Science Conference Proceedings (OSTI)

Prototype generation techniques have arisen as very competitive methods for enhancing the nearest neighbor classifier through data reduction. Within the prototype generation methodology, the methods of adjusting the prototypes' positioning have shown ... Keywords: Classification, Differential evolution, Feature weighting, Nearest neighbor, Prototype generation, Prototype selection

Isaac Triguero; JoaquíN Derrac; Salvador GarcíA; Francisco Herrera

2012-11-01T23:59:59.000Z

458

SLAC 16-channel differential TTL output module (Engineering Materials)  

SciTech Connect

The drawings listed on the Drawing List provide the data and specifications for constructing a SLAC 16-channel differential TTL output module as used in the SLAC PEP storage ring instrumentation and control system. It is a CAMAC module used as an output interface module from CAMAC signals.

Not Available

1983-04-05T23:59:59.000Z

459

Procedures to predict vertical differential soil movement for expansive soils  

E-Print Network (OSTI)

Damage to lightly loaded structures, paving and service piping in areas of expansive clay soils has occurred throughout the world. The cause of this damage has been the inability to accurately model expansive soil movement so that foundations are adequately designed to withstand the movement. The amount and rate of differential soil movement for expansive soils is due to a combination of soil characteristics, namely: suction compression index, unsaturated permeability, and diffusivity. Currently, geotechnical engineers run tests to measure the soil properties required to estimate differential soil movements. However, there seems to be apprehension toward attempting these soil movement calculations due to the perceived complexity of the calculations or a simple lack of understanding of the theory. The procedures delineating the step by step process used to calculate suction profiles and volume strains of expansive soils is presented. These procedures include the methodology to predict soil heave and shrink underneath shallow foundations which generate maximum center lift and maximum edge lift slab distortion modes. The main contributions of this research are: equations and procedures to calculate the equilibrium suction profile and depth to constant suction for a particular soil profile and location, equations to calculate the horizontal velocity flow of water in unsaturated soils, the methodology to predict differential soil movement shortly after a slab has been constructed and before the soil under the slab has reached an equilibrium moisture content, and the procedures to apply differential soil movement theory to soil profiles with shallow foundation design.

Naiser, Donald David

1997-01-01T23:59:59.000Z

460

Optimized web services security performance with differential parsing  

Science Conference Proceedings (OSTI)

The focus of this paper is to exploit a differential technique based on the similarities among the byte sequences of the processed SOAP messages in order to improve the performance of the XML processing in the Web Service Security (WS-Security) processing. ... Keywords: XML parsing, performance, web services, web services security

Masayoshi Teraguchi; Satoshi Makino; Ken Ueno; Hyen-Vui Chung

2006-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "differential scanning calorimetry" 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

ORIGINAL PAPER Differential sperm expenditure by male sailfin mollies,  

E-Print Network (OSTI)

Introduction It is increasingly evident that sperm production is costly to males (Dewsbury 1982; Nakatsuru expected outcome of costly sperm production is differential control of sperm production and expenditure strategies that reduce costs associated with spermatogenesis. This is especially true when males

Gabor, Caitlin - Department of Biology, Texas State University

462

Manifold gasket accommodating differential movement of fuel cell stack  

DOE Patents (OSTI)

A gasket for use in a fuel cell system having at least one externally manifolded fuel cell stack, for sealing the manifold edge and the stack face. In accordance with the present invention, the gasket accommodates differential movement between the stack and manifold by promoting slippage at interfaces between the gasket and the dielectric and between the gasket and the stack face.

Kelley, Dana A. (New Milford, CT); Farooque, Mohammad (Danbury, CT)

2007-11-13T23:59:59.000Z

463

Differential energy based microgrid protection against fault conditions  

Science Conference Proceedings (OSTI)

A differential energy based fault protection in microgrid is presented in this paper. Initially the currents at the respective buses are retrieved and processed through a novel time-frequency transform known as S-transform to generate time-frequency ...

S. R. Samantaray; Geza Joos; I. Kamwa

2012-01-01T23:59:59.000Z

464

Low-Temperature Relaxation Calorimetry of Some Molecular ...  

Science Conference Proceedings (OSTI)

... measure heat capacity of organic charge transfer salts is ... chips, we have measured the heat capacity of ... k-(BEDT- TTF)2Cu2(CN)3 salt which shows ...

2006-07-20T23:59:59.000Z

465

Calorimetry for Lepton Collider Experiments - CALICE results and activities  

E-Print Network (OSTI)

The CALICE collaboration conducts calorimeter R&D for highly granular calorimeters, mainly for their application in detectors for a future lepton collider at the TeV scale. The activities ranges from generic R&D with small devices up to extensive beam tests with prototypes comprising up to several 100000 calorimeter cells. CALICE has validated the performance of particle flow algorithms with test beam data and delivers the proof of principle that highly granular calorimeters can be built, operated and understood. The successes achieved in the past years allows the step from prototypes to calorimeter systems for particle physics detectors to be addressed.

The CALICE Collaboration

2012-12-20T23:59:59.000Z

466

Relaxation calorimetry technique for measuring low temperature specific heat  

E-Print Network (OSTI)

in the heater voltage, and W, the width of the acceptance window used to select the data for analysis. Two thermometer also served as a heater. The measurements extended from 3.75 to 8.5 K, with a temperature a realistic model of heat flow with an algorithm that fits the transient thermal response of a calorimeter

Andrei, Eva Y.

467

Energy absorption by laser fusion targets determined by ion calorimetry  

SciTech Connect

The absorbed energy determined by the ion calorimeters was used as a basis for computations of the target behavior. Both neutron yield and x-ray spectra thus obtained were in agreement with the measured values within the precision of both calculations and experiments. Some results are described. (MOW)

Rupert, V.C.; Gunn, S.R.; Holzrichter, J.F.

1976-10-01T23:59:59.000Z

468

Tritium measurement technique using in-bed'' calorimetry  

DOE Green Energy (OSTI)

One of the new technologies that has been introduced to the Savannah River Site (SRS) is the production scale use of metal hydride technology to store, pump, and compress hydrogen isotopes. For tritium stored in metal hydride storage beds, a unique relationship does not exist between the amount of tritium in the bed and the pressure-volume-temperature properties of the hydride material. Determining the amount of tritium in a hydride bed after desorbing the contents of the bed to a tank and performing pressure, volume, temperature, and composition (PVTC) measurements is not practical due to long desorption/absorption times and the inability to remove tritium heels'' from the metal hydride materials under normal processing conditions. To eliminate the need to remove tritium from hydride storage beds for measurement purposes, and in-bed'' tritium calorimetric measurement technique has been developed. The steady-state temperature rise of a gas stream flowing through a jacketed metal hydride storage bed is measured and correlated with power input to electric heaters used to simulate the radiolytic power generated by the decay of tritium to {sup 3}He. Temperature rise results for prototype metal hydride storage beds and the effects of using different gases in the bed are shown. Linear regression results shows that for 95% confidence intervals, temperature rise measurements can be obtained in 14 hours and have an accuracy of {plus minus}1.6% of a tritium filled hydride storage bed.

Klein, J.E.; Mallory, M.K.; Nobile, A. Jr.

1991-01-01T23:59:59.000Z

469

Tritium measurement technique using ``in-bed`` calorimetry  

DOE Green Energy (OSTI)

One of the new technologies that has been introduced to the Savannah River Site (SRS) is the production scale use of metal hydride technology to store, pump, and compress hydrogen isotopes. For tritium stored in metal hydride storage beds, a unique relationship does not exist between the amount of tritium in the bed and the pressure-volume-temperature properties of the hydride material. Determining the amount of tritium in a hydride bed after desorbing the contents of the bed to a tank and performing pressure, volume, temperature, and composition (PVTC) measurements is not practical due to long desorption/absorption times and the inability to remove tritium ``heels`` from the metal hydride materials under normal processing conditions. To eliminate the need to remove tritium from hydride storage beds for measurement purposes, and ``in-bed`` tritium calorimetric measurement technique has been developed. The steady-state temperature rise of a gas stream flowing through a jacketed metal hydride storage bed is measured and correlated with power input to electric heaters used to simulate the radiolytic power generated by the decay of tritium to {sup 3}He. Temperature rise results for prototype metal hydride storage beds and the effects of using different gases in the bed are shown. Linear regression results shows that for 95% confidence intervals, temperature rise measurements can be obtained in 14 hours and have an accuracy of {plus_minus}1.6% of a tritium filled hydride storage bed.

Klein, J.E.; Mallory, M.K.; Nobile, A. Jr.

1991-12-31T23:59:59.000Z

470

Radiometric Validation of ERS-1 Along-Track Scanning Radiometer Average Sea Surface Temperature in the Atlantic Ocean  

Science Conference Proceedings (OSTI)

The ERS-1 along-track scanning radiometer (ATSR) provides a half-degree latitude by half-degree longitude average sea surface temperature (ASST) measurement representative of the thermal skin layer of the ocean that is intended for use in global ...

Craig J. Donlon; Ian S. Robinson

1998-06-01T23:59:59.000Z

471

Circle plus partial helical scan scheme for a flat panel detector-based cone beam breast X-ray CT  

Science Conference Proceedings (OSTI)

Flat panel detector-based cone beam breast CT (CBBCT) can provide 3D image of the scanned breast with 3D isotropic spatial resolution, overcoming the disadvantage of the structure superimposition associated with X-ray projection mammography. It is very ...

Dong Yang; Ruola Ning; Weixing Cai

2009-01-01T23:59:59.000Z

472

Absolute entropy and free energy of fluids using the hypothetical scanning method. I. Calculation of transition probabilities from local grand  

E-Print Network (OSTI)

Absolute entropy and free energy of fluids using the hypothetical scanning method. I. Calculation the absolute entropy and free energy from a Boltzmann sample generated by Monte Carlo, molecular dynamics for the free energy. We demonstrate that very good results for the entropy and the free energy can be obtained

Meirovitch, Hagai

473

FORCE SENSING IN SCANNING TUNNELING MICROSCOPY U. DURIG, J.K. GIMZEWSKI, D.W. POHL and R. SCHLITTLER  

E-Print Network (OSTI)

FORCE SENSING IN SCANNING TUNNELING MICROSCOPY U. DURIG, J.K. GIMZEWSKI, D.W. POHL and R, (1986) 930. [3] U. Durig, J.K. Gimzewski, and D.W. Pohl, Phys. Rev. Lett., in press. [4] J. Soler, A

Gimzewski, James

474

Cloud Clearing over the Ocean in the Processing of Data from the Along-Track Scanning Radiometer (ATSR)  

Science Conference Proceedings (OSTI)

Infrared radiometric measurements of surface parameters are prone to error if clouds are present in the observation path. The along-track scanning radiometer (ATSR) with its novel dual-view feature is able to correct for absorption effects in the ...

Albin M. Závody; Christopher T. Mutlow; David T. Llewellyn-Jones

2000-05-01T23:59:59.000Z

475

In-situ monitoring of electron beam induced deposition by atomic force microscopy in a scanning electron microscope  

Science Conference Proceedings (OSTI)

A new type of atomic force microscope is proposed for atomic force microscopic analysis inside a scanning electron microscope. We attached a piezoresisitive atomic force microscopic cantilever to a micro manipulator to achieve a compact and guidable ... Keywords: atomic force, electron beam induced deposition, in-situ monitoring, local gas injection, micro manipulator, microscope

S. Bauerdick; C. Burkhardt; R. Rudorf; W. Barth; V. Bucher; W. Nisch

2003-06-01T23:59:59.000Z

476

Direct measurement of interfacial structure in epitaxial Gd2O3 on GaAs (001) using scanning tunneling microscopy  

Science Conference Proceedings (OSTI)

The epitaxial growth of Gd"2O"3 on GaAs (001) has given a low interfacial density of states, resulting in the demonstration of the first inversion-channel GaAs metal-oxide-semiconductor field-effect transistor. Motivated by the significance of this discovery, ... Keywords: Electronic information, GaAs, Gd2O3, Interfacial stacking, Scanning tunneling microscopy

Y. P. Chiu; M. C. Shih; B. C. Huang; J. Y. Shen; M. L. Huang; W. C. Lee; P. Chang; T. H. Chiang; M. Hong; J. Kwo

2011-07-01T23:59:59.000Z

477

Measuring charge trap occupation and energy level in CdSe/ZnS quantum dots using a scanning tunneling microscope  

E-Print Network (OSTI)

We use a scanning tunneling microscope to probe single-electron charging phenomena in individual CdSe/ZnS (core/shell) quantum dots (QDs) at room temperature. The QDs are deposited on top of a bare Au thin film and form a ...

Bulovic, Vladimir

478

Virtual architectural 3d model of the imperial cathedral (kaiserdom) of königslutter, germany through terrestrial laser scanning  

Science Conference Proceedings (OSTI)

The imperial cathedral (Kaiserdom) of Königslutter, Germany, is one of the most important examples of Romanesque architecture north of the Alps. In April 2010 complex conservation and restoration works were finished to celebrate the 875th ... Keywords: 3D, CAD, laser scanning, modelling, terrestrial, visualisation

Thomas P. Kersten; Maren Lindstaedt

2012-10-01T23:59:59.000Z

479

Threshold jumping and wrap-around scan techniques toward efficient tag identification in high density RFID systems  

Science Conference Proceedings (OSTI)

With the emergence of wireless RFID technologies, the problem of Anti-Collision has been arousing attention and instigated researchers to propose different heuristic algorithms for advancing RFID systems operated in more efficient manner. However, there ... Keywords: Query tree, Tag anti-collision, Threshold jumping, Wrap-around scan

Ching-Hsien Hsu; Han-Chieh Chao; Jong Hyuk Park

2011-09-01T23:59:59.000Z

480

Assessment of cardiac single-photon emission computed tomography performance using a scanning linear observer  

SciTech Connect

Purpose: Single-photon emission computed tomography (SPECT) is widely used to detect myocardial ischemia and myocardial infarction. It is important to assess and compare different SPECT system designs in order to achieve the highest detectability of cardiac defects. Methods: Whitaker et al.'s study ['Estimating random signal parameters from noisy images with nuisance parameters: linear and scanning-linear methods,' Opt. Express 16(11), 8150-8173 (2008)] on the scanning linear observer (SLO) shows that the SLO can be used to estimate the location and size of signals. One major advantage of the SLO is that it can be used with projection data rather than with reconstruction data. Thus, this observer model assesses the overall hardware performance independent of any reconstruction algorithm. In addition, the computation time of image quality studies is significantly reduced. In this study, three systems based on the design of the GE cadmium zinc telluride-based dedicated cardiac SPECT camera Discovery 530c were assessed. This design, which is officially named the Alcyone Technology: Discovery NM 530c, was commercialized in August, 2009. The three systems, GE27, GE19, and GE13, contain 27, 19, and 13 detectors, respectively. Clinically, a human heart can be virtually segmented into three coronary artery territories: the left-anterior descending artery, left-circumflex artery, and right coronary artery. One of the most important functions of a cardiac SPECT system is to produce images from which a radiologist can accurately predict in which territory the defect exists [http://www.asnc.org/media/PDFs/PPReporting081511.pdf, Guideline from American Society of Nuclear Cardiology]. A good estimation of the extent of the defect from the projection images is also very helpful for determining the seriousness of the myocardial ischemia. In this study, both the location and extent of defects were estimated by the SLO, and the system performance was assessed by localization receiver operating characteristic (LROC) [P. Khurd and G. Gindi, 'Decision strategies maximizing the area under the LROC curve,' Proc. SPIE 5749, 150-161 (2005)] or estimation receiver operating characteristic (EROC) [E. Clarkson, 'Estimation receiver operating characteristic curve and ideal observers for combined detection/estimation tasks,' J. Opt. Soc. Am. A 24, B91-B98 (2007)] curves. Results: The area under the LROC/EROC curve (AULC/AUEC) and the true positive fraction (TPF) at a specific false positive fraction (FPF) can be treated as the figures of merit. For radii estimation with a 1 mm tolerance, the AUEC values of the GE27, GE19, and GE13 systems are 0.8545, 0.8488, and 0.8329, and the TPF at FPF = 5% are 77.1%, 76.46%, and 73.55%, respectively. The assessment of all three systems revealed that the GE19 system yields estimated information and cardiac defect detectability very close to those of the GE27 system while using eight fewer detectors. Thus, 30% of the expensive detector units can be removed with confidence. Conclusions: As the results show, a combination of the SLO and LROC/EROC curves can determine the configuration that yields the most relevant estimation/detection information. Thus, this is a useful method for assessing cardiac SPECT systems.

Lee, Chih-Jie; Kupinski, Matthew A.; Volokh, Lana [College of Optical Sciences, University of Arizona, Tucson, Arizona 85721 (United States); GE Healthcare, Haifa 39120 (Israel)

2013-01-15T23:59:59.000Z

Note: This page contains sample records for the topic "differential scanning calorimetry" 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

REACTIVITY OF RESORCINOL FORMALDEHYDE RESIN WITH NITRIC ACID  

Science Conference Proceedings (OSTI)

Solid-state infrared spectroscopy, differential scanning calorimetry, and elemental analysis have been used to evaluate the reactivity of resorcinol formaldehyde resin with nitric acid and characterize the solid product. Two distinct reactions were identified within the temperature range 25-55 C. The first reaction is primarily associated with resin nitration, while the second involves bulk oxidation and degradation of the polymer network leading to dissolution and off-gassing. Reaction was confirmed with nitric acid concentrations as low as 3 M at 25 C applied temperature and 0.625 M at 66 C. Although a nitrated resin product can be isolated under appropriate experimental conditions, calorimetry testing indicates no significant hazard associated with handling the dry material.

King, W; Fernando Fondeur, F; Bill Wilmarth, B; Myra Pettis, M; Shirley Mccollum, S

2006-06-14T23:59:59.000Z

482

SCANNING ELECTRON MICROSCOPY AND X-RAY DIFFRACTION ANALYSIS OF TANK 18 SAMPLES  

Science Conference Proceedings (OSTI)

The F-Area Tank Farm (FTF) Performance Assessment (PA) utilizes waste speciation in the waste release model used in the FTF fate and transport modeling. The waste release modeling associated with the residual plutonium in Tank 18 has been identified as a primary contributor to the Tank 18 dose uncertainty. In order to reduce the uncertainty related to plutonium in Tank 18, a better understanding of the plutonium speciation in the Tank 18 waste (including the oxidation state and stoichiometry) is desired. Savannah River National Laboratory (SRNL) utilized Scanning Electron Microscopy (SEM) and X-ray Diffraction (XRD) to analyze Tank 18 samples to provide information on the speciation of plutonium in the waste material. XRD analysis of the Tank 18 samples did not identify any plutonium mineral phases in the samples. These indicates the crystalline mineral phases of plutonium are below the detection limits of the XRD method or that the plutonium phase(s) lack long range order and are present as amorphous or microcrystalline solids. SEM analysis of the Tank 18 samples did locate particles containing plutonium. The plutonium was found as small particles, usually <1 {micro}m but ranging up to several micrometers in diameter, associated with particles of an iron matrix and at low concentration in other elemental matrices. This suggests the plutonium has an affinity for the iron matrix. Qualitatively, the particles of plutonium found in the SEM analysis do not appear to account for all of the plutonium in the sample based on concentrations determined from the chemical analysis of the Tank 18 samples. This suggests that plutonium is also distributed throughout the solids in low concentrations.

Hay, M.; O'Rourke, P.; Ajo, H.

2012-03-08T23:59:59.000Z

483

Scanning tunneling microscopy of charge density wave structure in 1T- TaS sub 2  

SciTech Connect

I have used a scanning tunneling microscope (STM) to image simultaneously the atomic lattice and the charge density wave (CDW) superstructure in tantalum disulfide (1T-TaS{sub 2}) over the temperature range of 370-77K. In the lowest temperature (commensurate) phase, present below 180K, the CDW is at an angle of 13.9{degrees} relative to the lattice and is uniformly commensurate. In the incommensurate phase, present above 353K, the CDW is aligned with the lattice. 1T-TaS{sub 2} exhibits two other phases; the triclinic (T) phase which is present between 223K and 283K upon warming the sample, and the nearly-commensurate (NC) phase which is present between 353K and 180K upon cooling the sample and between 283K and 353K upon warming the sample. In both of these phases, discommensurate models where the CDW is arranged in small commensurate domains have been proposed. In the NC phase the CDW is rotated between 10{degrees} and 12.5{degrees} relative to the atomic lattice. Such a rotated CDW would create an interference pattern with the underlying atomic lattice regardless of the existence of a true domain superstructure. Previous work on 1T-TaS{sub 2} has not adequately accounted for the possibility of this moire pattern. However, around each fundamental CDW peak in the Fourier transform of the real space STM images, several satellite spots are visible, which conclusively prove the existence of domains in the NC phase.

Thomson, R.E.

1991-11-01T23:59:59.000Z

484

Scanning tunneling microscopy of charge density wave structure in 1T- TaS{sub 2}  

SciTech Connect

I have used a scanning tunneling microscope (STM) to image simultaneously the atomic lattice and the charge density wave (CDW) superstructure in tantalum disulfide (1T-TaS{sub 2}) over the temperature range of 370-77K. In the lowest temperature (commensurate) phase, present below 180K, the CDW is at an angle of 13.9{degrees} relative to the lattice and is uniformly commensurate. In the incommensurate phase, present above 353K, the CDW is aligned with the lattice. 1T-TaS{sub 2} exhibits two other phases; the triclinic (T) phase which is present between 223K and 283K upon warming the sample, and the nearly-commensurate (NC) phase which is present between 353K and 180K upon cooling the sample and between 283K and 353K upon warming the sample. In both of these phases, discommensurate models where the CDW is arranged in small commensurate domains have been proposed. In the NC phase the CDW is rotated between 10{degrees} and 12.5{degrees} relative to the atomic lattice. Such a rotated CDW would create an interference pattern with the underlying atomic lattice regardless of the existence of a true domain superstructure. Previous work on 1T-TaS{sub 2} has not adequately accounted for the possibility of this moire pattern. However, around each fundamental CDW peak in the Fourier transform of the real space STM images, several satellite spots are visible, which conclusively prove the existence of domains in the NC phase.

Thomson, R.E.

1991-11-01T23:59:59.000Z

485

Regulation of Mammary Lactogenic Differentiation by Singleminded-2s  

E-Print Network (OSTI)

Sim2s is a basic helix-loop-helix Per-Arnt-Sim (bHLH-PAS) transcription factor. In Drosophila, the Sim2 homolog, sim, is necessary for cell fate determination during central nervous system (CNS) development. In mammals, both Sim2 isoforms are involved in development of various tissues, including muscle, cartilage, and mammary gland. Loss-of-function studies revealed a role for Sim2s in specifying epithelial cell fate during mammary development and inhibiting growth and invasion of aggressive breast cancer cells. This study determined the role of Sim2s in mammary epithelial cell differentiation. Our hypothesis is that Sim2s is sufficient to promote lactogenic differentiation in vivo, characterized by expression of lactation-specific genes. Two models were used to test this hypothesis: (1) a transgenic mouse, expressing Sim2s under control of the MMTV-LTR, and (2) the mouse mammary epithelial cell line HC11. Together, these models allow analysis of the effect of Sim2s on global mammary gland differentiation and the mechanism through which it accomplishes this in a relatively homogenous population of cells. We determined that precocious expression of Sim2s in vivo is associated with upregulation of a subset of milk protein genes in nulliparous females. During early pregnancy, Sim2s regulation of lactogenic differentiation extended to a larger group of genes. Following pup removal, Sim2s appears to promote survival of alveolar epithelial cells. In vitro, Sim2s expression is necessary for maximal Csn2 expression, as determined by loss-of-function studies. Overexpression of Sim2s is sufficient to enhance prolactin-mediated Csn2 expression. Chromatin immunoprecipitation assays performed in HC11 cells revealed enhanced recruitment of Stat5a and RNA Polymerase II (RNAPII) to the regulatory region of Csn2 in the presence of Sim2s. In addition, Sim2s and RNAPII were found in a complex that was localized to both the promoter and coding region of the Csn2 gene. These studies support the idea that Sim2s is upregulated in a developmental stage-specific manner in the mouse mammary gland to promote the survival and differentiation of alveolar epithelial cells expressing high levels of milk protein genes. Further, Sim2s may regulate the function of a specific subset of alveolar cells by targeting the RNAPII holoenzyme complex to genes expressed during lactogenic differentiation.

Wellberg, Elizabeth

2009-05-01T23:59:59.000Z

486

Quantified Differential Dynamic Logic for Distributed Hybrid Systems  

E-Print Network (OSTI)

We address a fundamental mismatch between the combinations of dynamics that occur in complex physical systems and the limited kinds of dynamics supported in analysis. Modern applications combine communication, computation, and control. They may even form dynamic networks, where neither structure nor dimension stay the same while the system follows mixed discrete and continuous dynamics. We provide the logical foundations for closing this analytic gap. We develop a system model for distributed hybrid systems that combines quantified differential equations with quantified assignments and dynamic dimensionality-changes. We introduce a dynamic logic for verifying distributed hybrid systems and present a proof calculus for it. We prove that this calculus is a sound and complete axiomatization of the behavior of distributed hybrid systems relative to quantified differential equations. In our calculus we have proven collision freedom in distributed car control even when new cars may appear dynamically on the road.

André Platzer

2010-01-01T23:59:59.000Z

487

Controlled differential pressure system for an enhanced fluid blending apparatus  

DOE Patents (OSTI)

A system and method for producing a controlled blend of two or more fluids. Thermally-induced permeation through a permeable tube is used to mix a first fluid from outside the tube with a second fluid flowing through the tube. Mixture ratios may be controlled by adjusting the temperature of the first fluid or by adjusting the pressure drop through the permeable tube. The combination of a back pressure control valve and a differential regulator is used to control the output pressure of the blended fluid. The combination of the back pressure control valve and differential regulator provides superior flow control of the second dry gas. A valve manifold system may be used to mix multiple fluids, and to adjust the volume of blended fluid produced, and to further modify the mixture ratio.

Hallman, Jr., Russell Louis (Knoxville, TN)

2009-02-24T23:59:59.000Z

488

System for measuring multiphase flow using multiple pressure differentials  

DOE Patents (OSTI)

An improved method and system for measuring a multi-phase flow in a pressure flow meter. An extended throat venturi is used and pressure of the multi-phase flow is measured at three or more positions in the venturi, which define two or more pressure differentials in the flow conduit. The differential pressures are then used to calculate the mass flow of the gas phase, the total mass flow, and the liquid phase. The system for determining the mass flow of the high void fraction fluid flow and the gas flow includes taking into account a pressure drop experienced by the gas phase due to work performed by the gas phase in accelerating the liquid phase.

Fincke, James R. (Idaho Falls, ID)

2003-01-01T23:59:59.000Z

489

Scanning tunneling microscopy studies on the structure and stability of model catalysts  

E-Print Network (OSTI)

An atomic level understanding of the structure and stability of model catalysts is essential for surface science studies in heterogeneous catalysis. Scanning tunneling microscopy (STM) can operate both in UHV and under realistic pressure conditions with a wide temperature span while providing atomic resolution images. Taking advantage of the ability of STM, our research focuses on 1) investigating the structure and stability of supported Au catalysts, especially under CO oxidation conditions, and 2) synthesizing and characterizing a series of alloy model catalysts for future model catalytic studies. In our study, Au clusters supported on TiO2(110) have been used to model supported Au catalysts. Our STM studies in UHV reveal surface structures of TiO2(110) and show undercoordinated Ti cations play a critical role in the nucleation and stabilization of Au clusters on TiO2(110). Exposing the TiO2(110) surface to water vapor causes the formation of surface hydroxyl groups and subsequently alters the growth kinetics of Au clusters on TiO2(110). STM studies on Au/TiO2(110) during CO oxidation demonstrate the real surface of a working catalyst. Au clusters supported on TiO2(110) sinter rapidly during CO oxidation, but are mostly stable in the single component reactant gas, either CO or O2. The sintering kinetics of supported Au clusters has been measured during CO oxidation and gives an activation energy, which supports the mechanism of CO oxidation induced sintering. CO oxidation was also found to accelerate the surface diffusion of Rh(110). Our results show a direct correlation between the reaction rate of CO oxidation and the diffusion rate of surface metal atoms. Synthesis of alloy model catalysts have also been attempted in our study with their structures successfully characterized. Planar Au-Pd alloy films has been prepared on a Rh(100) surface with surface Au and Pd atoms distinguished by STM. The growth of Au-Ag alloy clusters have been studied by in-situ STM on a cluster-to-cluster basis. Moreover, the atomic structure of a solution-prepared Ru3Sn3 cluster has been resolved on an ultra-thin silica film surface. The atomic structure and adsorption sites of the ultrathin silica film have also been well characterized in our study.

Yang, Fan

2007-12-01T23:59:59.000Z

490

Scanning tunneling microscopic studies of SiO2 thin film supported metal nano-clusters  

E-Print Network (OSTI)

This dissertation is focused on understanding heterogeneous metal catalysts supported on oxides using a model catalyst system of SiO2 thin film supported metal nano-clusters. The primary technique applied to this study is scanning tunneling microscopy (STM). The most important constituent of this model catalyst system is the SiO2 thin film, as it must be thin and homogeneous enough to apply electron or ion based surface science techniques as well as STM. Ultra-thin SiO2 films were successfully synthesized on a Mo(112) single crystal. The electronic and geometric structure of the SiO2 thin film was investigated by STM combined with LEED, Auger electron spectroscopy (AES), and X-ray photoelectron spectroscopy (XPS). The relationship between defects on the SiO2 thin film and the nucleation and growth of metal nano-clusters was also investigated. By monitoring morphology changes during thermal annealing, it was found that the metal-support interaction is strongly dependent on the type of metal as well as on the defect density of the SiO2 thin film. Especially, it was found that oxygen vacancies and Si impurities play an important role in the formation of Pd-silicide. By substituting Ti atoms into the SiO2 thin film network, an atomically mixed TiO2-SiO2 thin film was synthesized. Furthermore, these Ti atoms play a role as heterogeneous defects, resulting in the creation of nucleation sites for Au nano-clusters. A marked increase in Au cluster density due to Ti defects was observed in STM. A TiO2-SiO2 thin film consisting of atomic Ti as well as TiOx islands was also synthesized by using higher amounts of Ti (17 %). More importantly, this oxide surface was found to have sinter resistant properties for Au nano-clusters, which are desirable in order to make highly active Au nano-clusters more stable under reaction conditions.

Min, Byoung Koun

2004-08-01T23:59:59.000Z

491

Compressibility and local instabilities of differentially rotating magnetized gas  

E-Print Network (OSTI)

We study the stability of compressible cylindrical differentially rotating flow in the presence of the magnetic field, and show that compressibility alters qualitatively the stability properties of flows. Apart from the well-known magnetorotational instability that can occur even in incompressible flow, there exist a new instability caused by compressibility. The necessary condition of the newly found instability can easily be satisfied in various flows in laboratory and astrophysical conditions and reads $B_{s} B_{\\phi} \\Omega' \

Bonanno, A; Bonanno, Alfio; Urpin, Vadim

2007-01-01T23:59:59.000Z

492

Community Structure and Topical Differentiation in European RTD Collaborations  

E-Print Network (OSTI)

We investigate research and development collaborations under the EU Framework Programs (FPs) for Research and Technological Development. The collaborations in the FPs give rise to bipartite networks, with edges existing between projects and the organizations taking part in them. A version of the modularity measure, adapted to bipartite networks, is presented. Communities are found so as to maximize the bipartite modularity. Projects in the resulting communities are shown to be topically differentiated.

Barber, Michael J; Streit, Ludwig; Strogan, Oleg

2010-01-01T23:59:59.000Z

493

Differential rotation in solar-like stars from global simulations  

E-Print Network (OSTI)

To explore the physics of large-scale flows in solar-like stars, we perform 3D anelastic simulations of rotating convection for global models with stratification resembling the solar interior. The numerical method is based on an implicit large-eddy simulation approach designed to capture effects from non-resolved small scales. We obtain two regimes of differential rotation, with equatorial zonal flows accelerated either in the direction of rotation (solar-like) or in the opposite direction (anti-solar). While the models with the solar-like differential rotation tend to produce multiple cells of meridional circulation, the models with anti-solar differential rotation result in only one or two meridional cells. Our simulations indicate that the rotation and large-scale flow patterns critically depend on the ratio between buoyancy and Coriolis forces. By including a subadiabatic layer at the bottom of the domain, corresponding to the stratification of a radiative zone, we reproduce a layer of strong radial shear...

Guerrero, G; Kosovichev, A G; Mansour, N N

2013-01-01T23:59:59.000Z

494

Automatic differentiation of advanced CFD codes for multidisciplinary design  

SciTech Connect

Automated multidisciplinary design of aircraft and other flight vehicles requires the optimization of complex performance objectives with respect to a number of design parameters and constraints. The effect of these independent design variables on the system performance criteria can be quantified in terms of sensitivity derivatives which must be calculated and propagated by the individual discipline simulation codes. Typical advanced CFD analysis codes do not provide such derivatives as part of a flow solution; these derivatives are very expensive to obtain by divided (finite) differences from perturbed solutions. It is shown here that sensitivity derivatives can be obtained accurately and efficiently using the ADIFOR source translator for automatic differentiation. In particular, it is demonstrated that the 3-D, thin-layer Navier-Stokes, multigrid flow solver called TLNS3D is amenable to automatic differentiation in the forward mode even with its implicit iterative solution algorithm and complex turbulence modeling. It is significant that using computational differentiation, consistent discrete nongeometric sensitivity derivatives have been obtained from an aerodynamic 3-D CFD code in a relatively short time, e.g. O(man-week) not O(man-year).

Bischof, C.; Corliss, G.; Griewank, A. (Argonne National Lab., IL (United States)); Green, L.; Haigler, K.; Newman, P. (National Aeronautics and Space Administration, Hampton, VA (United States). Langley Research Center)

1992-01-01T23:59:59.000Z

495

Automatic differentiation of advanced CFD codes for multidisciplinary design  

SciTech Connect

Automated multidisciplinary design of aircraft and other flight vehicles requires the optimization of complex performance objectives with respect to a number of design parameters and constraints. The effect of these independent design variables on the system performance criteria can be quantified in terms of sensitivity derivatives which must be calculated and propagated by the individual discipline simulation codes. Typical advanced CFD analysis codes do not provide such derivatives as part of a flow solution; these derivatives are very expensive to obtain by divided (finite) differences from perturbed solutions. It is shown here that sensitivity derivatives can be obtained accurately and efficiently using the ADIFOR source translator for automatic differentiation. In particular, it is demonstrated that the 3-D, thin-layer Navier-Stokes, multigrid flow solver called TLNS3D is amenable to automatic differentiation in the forward mode even with its implicit iterative solution algorithm and complex turbulence modeling. It is significant that using computational differentiation, consistent discrete nongeometric sensitivity derivatives have been obtained from an aerodynamic 3-D CFD code in a relatively short time, e.g. O(man-week) not O(man-year).

Bischof, C.; Corliss, G.; Griewank, A. [Argonne National Lab., IL (United States); Green, L.; Haigler, K.; Newman, P. [National Aeronautics and Space Administration, Hampton, VA (United States). Langley Research Center

1992-12-31T23:59:59.000Z

496

Approximate Controllability for Linear Stochastic Differential Equations in Infinite Dimensions  

SciTech Connect

The objective of the paper is to investigate the approximate controllability property of a linear stochastic control system with values in a separable real Hilbert space. In a first step we prove the existence and uniqueness for the solution of the dual linear backward stochastic differential equation. This equation has the particularity that in addition to an unbounded operator acting on the Y-component of the solution there is still another one acting on the Z-component. With the help of this dual equation we then deduce the duality between approximate controllability and observability. Finally, under the assumption that the unbounded operator acting on the state process of the forward equation is an infinitesimal generator of an exponentially stable semigroup, we show that the generalized Hautus test provides a necessary condition for the approximate controllability. The paper generalizes former results by Buckdahn, Quincampoix and Tessitore (Stochastic Partial Differential Equations and Applications, Series of Lecture Notes in Pure and Appl. Math., vol. 245, pp. 253-260, Chapman and Hall, London, 2006) and Goreac (Applied Analysis and Differential Equations, pp. 153-164, World Scientific, Singapore, 2007) from the finite dimensional to the infinite dimensional case.

Goreac, D. [Universite Paris-Est, LAMA, UMR 8050 (France)], E-mail: dan.goreac@univ-mlv.fr

2009-08-15T23:59:59.000Z

497