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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.


1

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

2

The oxidation of aluminum at high temperature studied by Thermogravimetric Analysis and Differential Scanning Calorimetry.  

SciTech Connect

The oxidation in air of high-purity Al foil was studied as a function of temperature using Thermogravimetric Analysis with Differential Scanning Calorimetry (TGA/DSC). The rate and/or extent of oxidation was found to be a non-linear function of the temperature. Between 650 and 750 %C2%B0C very little oxidation took place; at 850 %C2%B0C oxidation occurred after an induction period, while at 950 %C2%B0C oxidation occurred without an induction period. At oxidation temperatures between 1050 and 1150 %C2%B0C rapid passivation of the surface of the aluminum foil occurred, while at 1250 %C2%B0C and above, an initial rapid mass increase was observed, followed by a more gradual increase in mass. The initial rapid increase was accompanied by a significant exotherm. Cross-sections of oxidized specimens were characterized by scanning electron microscopy (SEM); the observed alumina skin thicknesses correlated qualitatively with the observed mass increases.

Coker, Eric Nicholas

2013-10-01T23:59:59.000Z

3

Excess heat capacity of the (Li1?xCax)F1+x liquid solution determined by differential scanning calorimetry and drop calorimetry  

Science Journals Connector (OSTI)

Abstract The work presents the measured heat capacity of the (Li1?xCax)F1+x liquid solution. Four samples with different compositions have been prepared and measured using a Differential Scanning Calorimeter. Since this technique was newly adopted for measuring encapsulated fluoride samples, some modifications were introduced in the standard configuration of the instrument and they are described in this work as well. For comparison one of the analysed composition ( x CaF 2 = 0.5) was also measured using drop calorimetry, which has been previously used for similar studies. The reliability of the results obtained was confirmed by the good agreement between the two techniques. Moreover, the excess heat capacity of the (Li1?xCax)F1+x liquid solution was derived and a strong deviation from the ideal behaviour was observed.

E. Capelli; O. Beneš; R.J.M. Konings

2015-01-01T23:59:59.000Z

4

Sublimation enthalpies at 298.15 K using correlation gas chromatography and differential scanning calorimetry measurements  

E-Print Network (OSTI)

Sublimation enthalpies at 298.15 K using correlation gas chromatography and differential scanning of Chemistry, University of Missouri-St. Louis, St. Louis, MO 63121, USA Received 20 June 1997; received in revised form 10 November 1997; accepted 11 November 1997 Abstract The sublimation enthalpies of 17

Chickos, James S.

5

Differential Scanning Microcalorimetry of Intrinsically Disordered Proteins  

Science Journals Connector (OSTI)

Ultrasensitive differential scanning calorimetry (DSC) is an indispensable thermophysical technique enabling to get direct information on enthalpies accompanying heating/cooling of dilute biopolymer solutions. Th...

Sergei E. Permyakov

2012-01-01T23:59:59.000Z

6

Nanoscale Calorimetry of Isolated Polyethylene Single Crystals  

E-Print Network (OSTI)

Nanoscale Calorimetry of Isolated Polyethylene Single Crystals A. T. KWAN, M. YU. EFREMOV, E. A-film differential scanning calorimetry to investigate the melt- ing of isolated polyethylene single crystals of lamellar single crystals of polyethylene (PE). We obtain thickness, diffraction, and calorimetry data

Allen, Leslie H.

7

Glass softening, crystallization, and vaporization of nano-aggregates of Amorphous Solid Water: Fast Scanning Calorimetry studies  

E-Print Network (OSTI)

Fast scanning calorimetry (FSC) was employed to investigate glass softening dynamics in amorphous solid water (ASW) nano-aggregates with thicknesses ranging from 2 to 20 nm. ASW nano-aggregates were prepared by vapor-deposition on the surface of a tungsten filament near 141 K and then heated at a rate of 100 kK/s. The resulting thermogram complex endo- and exothermal features were analyzed using a simple model. The results of the analysis show that glass softening of ASW nano-aggregates takes place at 160 K and vaporization of ASW nano-aggregates can take place at temperatures as low as 185 K. The results of these studies are discussed in conjunction with results of past studies of glass softening dynamics in water in various confining geometries.

Deepanjan Bhattacharya; Liam OReilly; Vlad Sadtchenko

2014-10-31T23:59:59.000Z

8

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.

9

Calorimetry and solar energy  

Science Journals Connector (OSTI)

Calorimetry and solar energy ... An experiment is described that helps students relate concepts of calorimetry to solar energy. ...

R. B. Shiflett

1978-01-01T23:59:59.000Z

10

A differential scanning calorimeter study of Mg-Al-Ca ternary system  

E-Print Network (OSTI)

A differential scanning calorimeter study of Mg-Al-Ca ternary system X.Wang1 , M.A. Parvez1 , E-MTL, Ottawa, Canada, essadiqi@NRCan.gc.ca The ternary phase diagram for Mg-Al-Ca alloy system is investigated.741g/cm3 in comparison with the densities of Al (2.70g/cm3 ) and Fe (7.86g/cm3 ). Magnesium also has

Medraj, Mamoun

11

Recent developments in silicon calorimetry  

SciTech Connect

We present a survey of some of the recent calorimeter applications of silicon detectors. The numerous attractive features of silicon detectors are summarized, with an emphasis on those aspects important to calorimetry. Several of the uses of this technology are summarized and referenced. We consider applications for electromagnetic calorimetry, hadronic calorimetry, and proposals for the SSC.

Brau, J.E.

1990-11-01T23:59:59.000Z

12

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

13

Bomb calorimetry: The energy content of pizza  

Science Journals Connector (OSTI)

Bomb calorimetry: The energy content of pizza ... Determining the energy content and percent protein of pizza using bomb calorimetry. ...

Roland P. Stout; Faith E. Nettleton; Lynn M. Price

1985-01-01T23:59:59.000Z

14

Ultra-sensitive Calorimetry for Microwave Cyclotron Resonance in a Two-Dimensional Electron Gas  

E-Print Network (OSTI)

GP-B-1 Ultra-sensitive Calorimetry for Microwave Cyclotron Resonance in a Two-dimensional electron in GaAs quantum wells. We construct a differential nano-calorimetry which can operate at 300 mK the sensitivity for detecting CR heating to several nano-watts. This ultra-sensitive technique opens up

15

Sandia National Laboratories: Battery Calorimetry Laboratory  

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

techniques to characterize energy storage systems. Accelerating rate calorimetry (ARC) is used to quantify calorific output and heating rates for runaway reactions in...

16

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

17

Combined use of adiabatic calorimetry and heat conduction calorimetry for quantifying propellant cook-off hazards  

Science Journals Connector (OSTI)

Recent work performed at DERA (now QinetiQ) has shown how accelerating rate calorimetry (ARC) can be used to obtain time to maximum rate curves using larger samples of energetic materials. The use of larger samples reduces the influence of thermal inertia, permitting experimental data to be gathered at temperatures closer to those likely to be encountered during manufacture, transportation or storage of an explosive device. However, in many cases, extrapolation of the time to maximum rate curve will still be necessary. Because of its low detection limit compared to the ARC, heat conduction calorimetry can be used to obtain data points at, or below, the region where an explosive system might exceed its temperature of no return and undergo a thermal explosion. Paired ARC and heat conduction calorimetry experiments have been conducted on some energetic material samples to explore this possibility further. Examples of where both agreement and disagreement are found between the two techniques are reported and the significance of these discussed. Ways in which combining ARC and heat conduction calorimetry experiments can enhance, complement and validate the results obtained from each technique are examined.

P.F. Bunyan; T.T. Griffiths; V.J. Norris

2003-01-01T23:59:59.000Z

18

Calorimetry of dehydrogenation and dangling-bond recombination in several hydrogenated amorphous silicon materials  

Science Journals Connector (OSTI)

Differential scanning calorimetry (DSC) was used to study the dehydrogenation processes that take place in three hydrogenated amorphous silicon materials: nanoparticles, polymorphous silicon, and conventional device-quality amorphous silicon. Comparison of DSC thermograms with evolved gas analysis (EGA) has led to the identification of four dehydrogenation processes arising from polymeric chains (A), SiH groups at the surfaces of internal voids (A?), SiH groups at interfaces (B), and in the bulk (C). All of them are slightly exothermic with enthalpies below 50meV?(H atoms), indicating that, after dissociation of any SiH group, most dangling bonds recombine. The kinetics of the three low-temperature processes [with DSC peak temperatures at around 320 (A), 360 (A?), and 430°C (B)] exhibit a kinetic-compensation effect characterized by a linear relationship between the activation entropy and enthalpy, which constitutes their signature. Their Si?H bond-dissociation energies have been determined to be E(Si?H)0=3.14 (A), 3.19 (A?), and 3.28eV (B). In these cases it was possible to extract the formation energy E(DB) of the dangling bonds that recombine after Si?H bond breaking [0.97 (A), 1.05 (A?), and 1.12 (B)]. It is concluded that E(DB) increases with the degree of confinement and that E(DB)>1.10eV for the isolated dangling bond in the bulk. After Si?H dissociation and for the low-temperature processes, hydrogen is transported in molecular form and a low relaxation of the silicon network is promoted. This is in contrast to the high-temperature process for which the diffusion of H in atomic form induces a substantial lattice relaxation that, for the conventional amorphous sample, releases energy of around 600meV per H atom. It is argued that the density of sites in the Si network for H trapping diminishes during atomic diffusion.

P. Roura, J. Farjas, Chandana Rath, J. Serra-Miralles, E. Bertran, and P. Roca i Cabarrocas

2006-02-13T23:59:59.000Z

19

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

SciTech Connect

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

20

NANO-SCALE CALORIMETRY OF ISOLATED POLYETHYLENE SINGLE CRYSTALS  

E-Print Network (OSTI)

#12;NANO-SCALE CALORIMETRY OF ISOLATED POLYETHYLENE SINGLE CRYSTALS BY ALEX TAN KWAN B.S., Stanford) device, the nanocalorimeter, it was possible to investigate the melting of isolated polyethylene (PE, a simple Ni-foil calorimeter, to measure the heat capacity of a thin polyethylene film to verify

Allen, Leslie H.

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

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

22

Calorimetry exchange program quarterly data report, fourth quarter CY92  

SciTech Connect

The goals of the Calorimetry Sample Exchange Program are: (1) discuss measurement differences (2) review and improve analytical measurements and methods (3) discuss new measurement capabilities (4) provide data to DOE on measurement capabilities to evaluate shipper- receiver differences (5) provide characterized or standard materials as necessary for exchange participants (6) provide a measurement control program for plutonium analysis A sample Of PUO2 powder is available at each participating site for NDA measurement, including either or both calorimetry and high-resolution gamma-ray spectroscopy, the elements which are typically combined to provide a calorimetric assay of plutonium. The facilities measure the sample as frequently and to the level of precision which they desire, and then submit the data to the Exchange for analysis. The data report includes summary tables for each measurement and charts showing the performance of each laboratory. Comparisons are made to the accepted values for the exchange sample and to data previously reported by that laboratory. This information is presented, in the form of quarterly reports as this document provides and as annual reports, intended for use by Exchange participants in measurement control programs, or to indicate when bias corrections may be appropriate. No attempt, however, has been made to standardize methods or frequency of data collection, calibration, or operating procedures. Direct comparisons between laboratories may, therefore, be misleading since data have not been collected to the same precision or for the same time periods. A meeting of the participants of the Calorimetry Exchange is held annually at EG&G Mound Applied Technologies. The purposes of this meeting are to discuss measurement differences, problems, and new measurement capabilities, and to determine the additional activities needed to fulfill the goals of the Exchange.

Barnett, T.M.

1992-12-31T23:59:59.000Z

23

Detectors for Linear Colliders: Calorimetry at a Future Electron-Positron Collider (3/4)  

ScienceCinema (OSTI)

Calorimetry will play a central role in determining the physics reach at a future e+e- collider. The requirements for calorimetry place the emphasis on achieving an excellent jet energy resolution. The currently favoured option for calorimetry at a future e+e- collider is the concept of high granularity particle flow calorimetry. Here granularity and a high pattern recognition capability is more important than the single particle calorimetric response. In this lecture I will describe the recent progress in understanding the reach of high granularity particle flow calorimetry and the related R&D; efforts which concentrate on test beam demonstrations of the technological options for highly granular calorimeters. I will also discuss alternatives to particle flow, for example the technique of dual readout calorimetry.

None

2011-10-06T23:59:59.000Z

24

Development and Deployment of a Compact Eye-Safe Scanning Differential absorption Lidar (DIAL) for Spatial Mapping of Carbon Dioxide for Monitoring/Verification/Accounting at Geologic Sequestration Sites  

SciTech Connect

A scanning differential absorption lidar (DIAL) instrument for monitoring carbon dioxide has been developed. The laser transmitter uses two tunable discrete mode laser diodes (DMLD) operating in the continuous wave (cw) mode with one locked to the online absorption wavelength and the other operating at the offline wavelength. Two in-line fiber optic switches are used to switch between online and offline operation. After the fiber optic switch, an acousto- optic modulator (AOM) is used to generate a pulse train used to injection seed an erbium doped fiber amplifier (EDFA) to produce eye-safe laser pulses with maximum pulse energies of 66 {micro}J, a pulse repetition frequency of 15 kHz, and an operating wavelength of 1.571 {micro}m. The DIAL receiver uses a 28 cm diameter Schmidt-Cassegrain telescope to collect that backscattered light, which is then monitored using a photo-multiplier tube (PMT) module operating in the photon counting mode. The DIAL instrument has been operated from a laboratory environment on the campus of Montana State University, at the Zero Emission Research Technology (ZERT) field site located in the agricultural research area on the western end of the Montana State University campus, and at the Big Sky Carbon Sequestration Partnership site located in north-central Montana. DIAL data has been collected and profiles have been validated using a co-located Licor LI-820 Gas Analyzer point sensor.

Repasky, Kevin

2014-03-31T23:59:59.000Z

25

Free motion scanning system  

DOE Patents (OSTI)

The present invention relates to an ultrasonic scanner system and method for the imaging of a part system, the scanner comprising: a probe assembly spaced apart from the surface of the part including at least two tracking signals for emitting radiation and a transmitter for emitting ultrasonic waves onto a surface in order to induce at least a portion of the waves to be reflected from the part, at least one detector for receiving the radiation wherein the detector is positioned to receive the radiation from the tracking signals, an analyzer for recognizing a three-dimensional location of the tracking signals based on the emitted radiation, a differential converter for generating an output signal representative of the waveform of the reflected waves, and a device such as a computer 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. (Pleasant Hills, PA)

2000-01-01T23:59:59.000Z

26

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

27

Reading and Listening to Music Increase Resting Energy Expenditure during an Indirect Calorimetry Test  

Science Journals Connector (OSTI)

Abstract Indirect calorimetry is often done early in the morning in a fasting state, with the subject unshowered and abstained from caffeine or other stimulants. Subjects often fall asleep, resulting in measurement of a sleeping metabolic rate rather than a resting metabolic rate. The objective of this study was to determine whether listening to self-selected relaxing music or reading an electronic device or magazine affects resting energy expenditure (REE) during measurement in healthy adults. A randomized trial comparing three different conditions (ie, resting, reading, and listening to music) was performed. Sixty-five subjects (36 female and 29 male) were used in final data analysis. Inclusion criteria included healthy subjects between the ages of 18 and 50 years with a stable weight. Exclusion criteria included pregnant or lactating women or use of medications known to affect metabolism. Results showed that reading either a magazine or an electronic device significantly increased REE by 102.7 kcal/day when compared with resting (Pdevice and magazine. Listening to self-selected relaxing music increased REE by 27.6 kcal/day compared with rest (P=0.0072). Based on our results, we recommend subjects refrain from reading a magazine or electronic device during an indirect calorimetry test. Whether or not the smaller difference found while listening to music is practically significant would be a decision for the indirect calorimetry test administrator.

Blaire Snell; Susan Fullmer; Dennis L. Eggett

2014-01-01T23:59:59.000Z

28

Photothermal imaging scanning microscopy  

DOE Patents (OSTI)

Photothermal Imaging Scanning Microscopy produces a rapid, thermal-based, non-destructive characterization apparatus. Also, a photothermal characterization method of surface and subsurface features includes micron and nanoscale spatial resolution of meter-sized optical materials.

Chinn, Diane (Pleasanton, CA); Stolz, Christopher J. (Lathrop, CA); Wu, Zhouling (Pleasanton, CA); Huber, Robert (Discovery Bay, CA); Weinzapfel, Carolyn (Tracy, CA)

2006-07-11T23:59:59.000Z

29

Test in a beam of large-area Micromegas chambers for sampling calorimetry  

E-Print Network (OSTI)

Application of Micromegas for sampling calorimetry puts specific constraints on the design and performance of this gaseous detector. In particular, uniform and linear response, low noise and stability against high ionisation density deposits are prerequisites to achieving good energy resolution. A Micromegas-based hadronic calorimeter was proposed for an application at a future linear collider experiment and three technologically advanced prototypes of 1$\\times$1 m$^{2}$ were constructed. Their merits relative to the above-mentioned criteria are discussed on the basis of measurements performed at the CERN SPS test-beam facility.

C. Adloff; M. Chefdeville; A. Dalmaz; C. Drancourt; R. Gaglione; N. Geffroy; J. Jacquemier; Y. Karyotakis; I. Koletsou; F. Peltier; J. Samarati; G. Vouters

2014-05-03T23:59:59.000Z

30

Test in a beam of large-area Micromegas chambers for sampling calorimetry  

E-Print Network (OSTI)

Application of Micromegas for sampling calorimetry puts specific constraints on the design and performance of this gaseous detector. In particular, uniform and linear response, low noise and stability against high ionisation density deposits are prerequisites to achieving good energy resolution. A Micromegas-based hadronic calorimeter was proposed for an application at a future linear collider experiment and three technologically advanced prototypes of 1$\\times$1 m$^{2}$ were constructed. Their merits relative to the above-mentioned criteria are discussed on the basis of measurements performed at the CERN SPS test-beam facility.

Adloff, C; Dalmaz, A; Drancourt, C; Gaglione, R; Geffroy, N; Jacquemier, J; Karyotakis, Y; Koletsou, I; Peltier, F; Samarati, J; Vouters, G

2014-01-01T23:59:59.000Z

31

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

32

E-Print Network 3.0 - arstide tga rahulolu Sample Search Results  

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

analysis (TGA) and differential scanning calorimetry (DSC) show that the heating... for sublimation was determined. Nonisothermal TGA and DSC traces run on pierced pan samples...

33

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

34

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...

35

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

36

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. 2 figs.

Oliver, W.C.; Blau, P.J.

1994-11-01T23:59:59.000Z

37

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

SciTech Connect

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

38

Differential displacement measurement using scanning x-ray beams  

Science Journals Connector (OSTI)

A noncontacting method for measuring mechanical strain between two fiducial marks has been developed for use where environmental conditions would be disruptive to methods utilizing optical light. A silicon 111 Johansson crystal is used for this application where Mo K? radiation is used to fluoresce fiducial markers made of yittria-stabilized zirconia. This substance is used for a thermal barrier coating in gas turbine engines and the technology for applying this material to withstand long term high temperature exposure is highly developed. The current system has a displacement repeatability of better than 0.1 ?m which is not limited by counting statistics but rather determined by mechanical considerations.

Howard A. Canistraro; Eric H. Jordan; Douglas M. Pease

1998-01-01T23:59:59.000Z

39

Characterization of adsorbates by2 transient measurements in Scanning3  

E-Print Network (OSTI)

1 1 Characterization of adsorbates by2 transient measurements in Scanning3 Electrochemical electrochemical microscopy in2 transient mode allows the investigation of adsorbate intermediates at a polarized3 measurement of the electrochemical6 impedance allowed the complex differential capacitance for each adsorbed

Boyer, Edmond

40

Rapid scanning mass spectrometer  

SciTech Connect

Mass spectrometers and residual gas analyzers (RGA) are used in a variety of applications for analysis of volatile and semi-volatile materials. Analysis is performed by detecting fragments of gas molecules, based on their mass to charge ratio, which are generated in the mass spectrometer. When used as a detector for a gas chromatograph, they function as a means to quantitatively identify isolated volatile species which have been separated from other species via the gas chromatograph. Vacuum Technology, Inc., (VTI) produces a magnetic sector mass spectrometer/RGA which is used in many industrial and laboratory environments. In order to increase the utility of this instrument, it is desirable to increase the mass scanning speed, thereby increasing the number of applications for which it is suited. This project performed the following three upgrades on the computer interface. (1) A new electrometer was designed and built to process the signal from the detector. This new electrometer is more sensitive, over 10 times faster, and over 100 times more stable than the electrometer it will replace. (2) The controller EPROM was reprogrammed with new firmware. This firmware acts as an operating system for the interface and is used to shuttle communications between the PC and the AEROVAC mass spectrometer. (3) The voltage regulator which causes the ion selector voltage to ramp to allow ions of selected mass to be sequentially detected was redesigned and prototyped. The redesigned voltage regulator can be ramped up or down more than 100 times faster than the existing regulator. These changes were incorporated into a prototype unit and preliminary performance testing conducted. Results indicated that scanning speed was significantly increased over the unmodified version.

Leckey, J.H. [Lockheed Martin Energy Systems, Inc., Oak Ridge, TN (United States); Boeckmann, M.D. [Vacuum Technology, Inc., Oak Ridge, TN (United States)

1996-11-25T23:59:59.000Z

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.


41

Recognizing targets from infrared intensity scan patterns using artificial neural networks  

E-Print Network (OSTI)

Recognizing targets from infrared intensity scan patterns using artificial neural networks Tayfun complicating the localization and recognition process. We employ artificial neural networks to deter- mine differentiation; artificial neural networks; optimal brain surgeon; pattern recognition. Paper 080450R received

Barshan, Billur

42

A Portable Airborne Scanning Lidar System for Ocean and Coastal Applications  

Science Journals Connector (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

43

Differential Equations  

Science Journals Connector (OSTI)

Modelica is a powerful language for describing the ... mathematical equations. We begin our discussion of Modelica by showing how simple systems of differential equations can be expressed using Modelica. The expr...

Michael Tiller Ph.D.

2001-01-01T23:59:59.000Z

44

Study of hydrogen and carbon monoxide adsorption on modified Zn/Cr catalysts by adsorption calorimetry  

SciTech Connect

Differential heat of adsorption (q) of hydrogen (a) and carbon monoxide (b) as a function of the adsorbed amount (a) on Zn/Cr catalysts at 463/sup 0/K; 1) unpromoted catalyst, 2) catalyst promoted with 2.5% of K/sub 2/O.

Yoshin, S.V.; Klyacho, A.L.; Kondrat'ev, L.T.; Leonov, V.E.; Skripchenko, G.B.; Sushchaya, L.E.

1986-08-01T23:59:59.000Z

45

Switchable stiffness scanning microscope probe  

E-Print Network (OSTI)

Atomic Force Microscopy (AFM) has rapidly gained widespread utilization as an imaging device and micro/nano-manipulator during recent years. This thesis investigates the new concept of a dual stiffness scanning probe with ...

Mueller-Falcke, Clemens T. (Clemens Tobias)

2005-01-01T23:59:59.000Z

46

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.

Nessi-Tedaldi, Francesca

2012-01-01T23:59:59.000Z

47

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

48

Partial scan design and test sequence generation based on reduced scan shift method  

Science Journals Connector (OSTI)

This paper presents a partial scan algorithm, calledPARES (PartialscanAlgorithm based onREduced Scan shift), for designing partial scan circuits. PARES is based on the reduced scan shift that has been previously ...

Yoshinobu Higami; Seiji Kajihara; Kozo Kinoshita

49

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.

50

katherine henderson Pathology Slide Scanning rev1 Page 1 10/21/14 Scanning in Pathology  

E-Print Network (OSTI)

katherine henderson Pathology Slide Scanning rev1 Page 1 10/21/14 Scanning in Pathology Pathology offers several scanning methods: · Whole slide scans to be used as virtual microscopy ­ Aperio Coolscan for 35mm slides or glass slides with adapter (scans tissue area, not cells) The above scanners

51

ARM: W-Band Scanning ARM Cloud Radar (W-SACR) Hemispherical Sky RHI Scans (6 horizon-to-horizon scans at 30-degree azimuth intervals)  

DOE Data Explorer (OSTI)

W-Band Scanning ARM Cloud Radar (W-SACR) Hemispherical Sky RHI Scans (6 horizon-to-horizon scans at 30-degree azimuth intervals)

Widener, Kevin; Nelson, Dan; Bharadwaj, Nitin; Lindenmaier, Iosif [Andrei; Johnson, Karen

52

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)

Bharadwaj, Nitin; Widener, Kevin

53

ARM: X-Band Scanning ARM Cloud Radar (XSACR) Hemispherical Sky RHI Scans (6 horizon-to-horizon scans at 30-degree azimuth intervals)  

DOE Data Explorer (OSTI)

X-Band Scanning ARM Cloud Radar (XSACR) Hemispherical Sky RHI Scans (6 horizon-to-horizon scans at 30-degree azimuth intervals)

Widener, Kevin; Nelson, Dan; Bharadwaj, Nitin; Lindenmaier, Iosif [Andrei; Johnson, Karen

54

NASA DC-8 Airborne Scanning Lidar System  

Science Journals Connector (OSTI)

A scanning lidar system is being developed for installation on the NASA DC-8 atmospheric research aircraft to support...in-situ aerosol and gas measurements. Design and objectives of the DC-8 scanning lidar are p...

Norman B. Nielsen; Edward E. Uthe…

1997-01-01T23:59:59.000Z

55

Three-dimensional scanning confocal laser microscope  

DOE Patents (OSTI)

A confocal microscope for generating an image of a sample includes a first scanning element for scanning a light beam along a first axis, and a second scanning element for scanning the light beam at a predetermined amplitude along a second axis perpendicular to the first axis. A third scanning element scans the light beam at a predetermined amplitude along a third axis perpendicular to an imaging plane defined by the first and second axes. The second and third scanning element are synchronized to scan at the same frequency. The second and third predetermined amplitudes are percentages of their maximum amplitudes. A selector determines the second and third predetermined amplitudes such that the sum of the percentages is equal to one-hundred percent.

Anderson, R. Rox (Lexington, MA); Webb, Robert H. (Lincoln, MA); Rajadhyaksha, Milind (Charlestown, MA)

1999-01-01T23:59:59.000Z

56

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...

57

Mg-Doped ZnO Nanoparticles for Efficient Sunlight-Driven Photocatalysis  

Science Journals Connector (OSTI)

Magnesium-doped ZnO (ZMO) nanoparticles were synthesized through an oxalate coprecipitation method. Crystallization of ZMO upon thermal decomposition of the oxalate precursors was investigated using differential scanning calorimetry (DSC) and X-ray ...

Vinodkumar Etacheri; Roshith Roshan; Vishwanathan Kumar

2012-05-03T23:59:59.000Z

58

Smectic ordering in polymer liquid crystal-silica aerogel nanocomposites  

Science Journals Connector (OSTI)

Two series of side chain liquid crystal (SCLC) polyacrylate-silica aerogel nanocomposites have been investigated by small-angle X-ray scattering (SAXS) and differential scanning calorimetry (DSC). The first se...

H. Westfahl Jr.

2005-02-01T23:59:59.000Z

59

Relaxation behavior of poly(trimethylene 2,6-naphthalate) in nanoclay confinement  

Science Journals Connector (OSTI)

The relaxation behavior of poly(trimethylene 2,6-naphthalate)/nanoclay composites is investigated using differential scanning calorimetry (DSC ... constrained the polymer chains in the vicinity of nanoclay layers...

Ahmad Nawaz Khan; Po-Da Hong; Wei-Tsung Chaung

2013-09-01T23:59:59.000Z

60

Application of Automation and Thermal Analysis to Resolving Agent Selection  

Science Journals Connector (OSTI)

The use of differential scanning calorimetry as a means to identify diastereoisomeric salts with a clear eutectic composition that is needed for effective resolution is described and forms the basis of a resolving agent screening process. Automated salt ...

Ulrich C. Dyer; David A. Henderson; Mark B. Mitchell

1999-03-19T23:59:59.000Z

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.


61

Enthalpy of formation of forsterite, enstatite, akermanite, monticellite and merwinite at 1073 K determined by alkali borate solution calorimetry  

Science Journals Connector (OSTI)

Enthalpies of solution of synthetic enstatite (Mg2Si2O6), forsterite (Mg2SiO4), akermanite (Ca2MgSi2O7), monticellite (CaMgSiO4), and merwinite (Ca3MgSi2O8) and their component oxides were determined in eutectic (Li, Na)BO2 at 1073 K. Resulting enthalpies of formation at 1073 are enstatite: ?8.10 ± 0.42 kcal; forsterite: ?14.23 ± 0.45 kcal; akermanite: ?42.60 ± 0.39 kcal; monticellite: ?25.05 ± 0.41 kcal; and merwinite: ?51.10 ± 0.49 kcal. The value for the synthetic monticellite of composition Mo.965Fo.035 was corrected slightly for non-stoichiometry based on experimental monticellite-forsterite phase equilibrium relations. The enthalpies of formation of enstatite and forsterite are somewhat less negative than yielded by several other solution calorimetric studies but are in good agreement with the recent Pb2B2O5 solution calorimetry of Kiselevaet al. (1979), and are in good agreement with values to be derived from reliable phase equilibrium data in the system MgO-Al2O3-SiO2. The enthalpies of formation of akermanite, monticellite and merwinite are all much less negative than values tabulated by robieet al. (1978) and helgesonet al. (1978) but are shown to be compatible with reliable phase equilibrium data for the system CaO-MgO-SiO2, whereas the tabulated values are not. Several methods of analysis yield an entropy of monticellite at 1000 K of 69.9 ± 0.2 cal/K.

C. Brousse; R.C. Newton; O.J. Kleppa

1984-01-01T23:59:59.000Z

62

Imaging - Clearer brain scans ... | ornl.gov  

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

Imaging - Clearer brain scans ... A clever signal noise reduction strategy developed by a team that includes Oak Ridge National Laboratory's Ben Lawrie could dramatically improve...

63

LC-circuit calorimetry  

SciTech Connect

We present a new type of calorimeter in which we couple an unknown heat capacity with the aid of Peltier elements to an electrical circuit. The use of an electrical inductance and an amplifier in the circuit allows us to achieve autonomous oscillations, and the measurement of the corresponding resonance frequency makes it possible to accurately measure the heat capacity with an intrinsic statistical uncertainty that decreases as {approx}t{sub m}{sup -3/2} with measuring time t{sub m}, as opposed to a corresponding uncertainty {approx}t{sub m}{sup -1/2} in the conventional alternating current method to measure heat capacities. We have built a demonstration experiment to show the feasibility of the new technique, and we have tested it on a gadolinium sample at its transition to the ferromagnetic state.

Bossen, O.; Schilling, A. [Physik-Institut der Universitaet Zuerich, Winterthurerstrasse 190, 8057 Zuerich (Switzerland)

2011-09-15T23:59:59.000Z

64

City of College Station's Thermographic Mobile Scan  

E-Print Network (OSTI)

During the first quarter of 1986, the City of College Station conducted a thermographic mobile scan of the entire city. A thermographic mobile scan is a process by which heat loss/heat gain data is accumulated by a vehicle traveling the city...

Shear, C. K.

1986-01-01T23:59:59.000Z

65

Spring Semester, Course Title: Scanned Probe Techniques  

E-Print Network (OSTI)

: a fundamental understanding of the theoretical underpinnings behind each scanned probe technique Probe Microscopy: Atomic Scale Engineering by Forces and Currents - Adam Foster and Werner Hofer Applied Scanning Probe Methods (Vol. 1-13) ­ Bharat Bhushan, ed. Springer Handbook of Nanotechnology - Bharat

Sherrill, David

66

The Scanning Theremin Microscope: A Model Scanning Probe Instrument for Hands-On Activities  

Science Journals Connector (OSTI)

(9, 10) However, we decided upon a different approach and worked with scanning probe principles to create a large-scale scanning device, the scanning theremin microscope (SThM). ... The simplest mode of scanning is to move the pantograph to scan the probe across the surface at a fixed height, listening for changes in pitch. ... We present a cascade-based computation scheme that has all of the devices and interconnects required for the one-time computation of an arbitrary logic function. ...

Rebecca C. Quardokus; Natalie A. Wasio; S. Alex Kandel

2013-12-20T23:59:59.000Z

67

Fast scanning two-photon microscopy  

E-Print Network (OSTI)

Fast scanning two-photon microscopy coupled with the use light activated ion channels provides the basis for fast imaging and stimulation in the characterization of in vivo neural networks. A two-photon microscope capable ...

Chang, Jeremy T

2010-01-01T23:59:59.000Z

68

Variable Temperature Scanning Probe Microscope | EMSL  

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

EMSL's ultra-high vacuum, variable-temperature scanning probe microscope system, or UHV VT SPM, is a state-of-the-art surface science tool comprising multiple complementary...

69

String Scanning in the Icon Programming Language  

Science Journals Connector (OSTI)

...Article String Scanning in the Icon Programming Language R. E. Griswold * Department of Computer Science, The University...general-purpose programming language and describes how they have been introduced in the Icon programming language....

R. E. Griswold

1990-01-01T23:59:59.000Z

70

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.

71

Management of thyroid nodules: scanning techniques, thyroid suppressive therapy, and fine needle aspiration  

SciTech Connect

For the differentiation of benign from malignant thyroidal disease, ultrasound displays anatomic but not histologic features. Other visualization techniques can be used including isotope scanning (radioiodine, 99m technetium, 241 americium fluorescence, 131 cesium, 67 gallium, 75 selenomethionine, 201 thallium, 32 phosphorus, 99m Tc-bleomycin, 197 mercury, 133 xenon), thermography, x-ray techniques (plain films, computed tomographic scan, xeroradiography, chest x-ray barium swallow, lymphography, angiography), and thyroid hormone suppression. Needle biopsy can be done by core biopsy (Vim-Silverman and drill biopsy), large needle biopsy for histologic processing and fine needle aspiration for cytologic interpretation. The latter is the safest, most reliable, and most cost-effective technique currently available to differentiate between benign and malignant thyroidal disease and has great promise for the future.

Ashcraft, M.W.; Van Herle, A.J.

1981-03-01T23:59:59.000Z

72

Variable Temperature Ultra-High Vacuum Scanning Tunneling Microscope...  

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

Vacuum Scanning Tunneling Microscope The Omicron variable temperature ultra-high vacuum (UHV) scanning tunneling microscope (VTSTM) is designed to study the structure of both clean...

73

A New Interpretation of the Scanning Tunneling Microscope Image...  

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

of Graphite. A New Interpretation of the Scanning Tunneling Microscope Image of Graphite. Abstract: In this work, highly-resolved scanning tunneling microscopy images of graphite...

74

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":""}]}

75

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

76

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 =

77

Scanning evanescent electro-magnetic microscope  

DOE Patents (OSTI)

A novel scanning microscope is described that uses near-field evanescent electromagnetic waves to probe sample properties. The novel microscope is capable of high resolution imaging and quantitative measurements of the electrical properties of the sample. The inventive scanning evanescent wave electromagnetic microscope (SEMM) can map dielectric constant, tangent loss, conductivity, complex electrical impedance, and other electrical parameters of materials. The quantitative map corresponds to the imaged detail. The novel microscope can be used to measure electrical properties of both dielectric and electrically conducting materials.

Xiang, Xiao-Dong (Alameda, CA); Gao, Chen (Alameda, CA)

2001-01-01T23:59:59.000Z

78

Thermogravimetric analysis and differential scanning calorimetric studies on nanoclay-filled TPU/PP blends  

Science Journals Connector (OSTI)

Thermal stability of ester-thermoplastic polyurethane (TPU)/polypropylene (PP) and ether-TPU/PP blends was evaluated by thermogravimetric studies. Thermal studies were made as a function of blend ratio. Effect...

Murugasamy Kannan; S. S. Bhagawan…

2013-06-01T23:59:59.000Z

79

Thermal behaviors of electrolytes in lithium-ion batteries determined by differential scanning calorimeter  

Science Journals Connector (OSTI)

Lithium-ion batteries have been widely used in daily electric ... occurred from time to time. Lithium-ion batteries composed of various electrolytes (containing organic solvents ... to meet safety requirements of...

Yu-Yun Sun; Tsai-Ying Hsieh; Yih-Shing Duh…

2014-06-01T23:59:59.000Z

80

LIVE SCAN FINGERPRINTING PROCESS AND RESPONSIBILITIES  

E-Print Network (OSTI)

LIVE SCAN FINGERPRINTING PROCESS AND RESPONSIBILITIES HUMAN RESOURCES Workforce Planning | One of recruitment) to your Workforce Planning Analyst. Notify Finalists Department must notify finalists of the Live. Workforce Planning Analyst will make available at the Human Resources reception desk, the appropriate number

Eirinaki, Magdalini

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

Department of Health I. Internal Scan  

E-Print Network (OSTI)

and cholesterol; and working with consumers, health plans and providers to improve the quality of care and other non- institutional settings. CURRRENT PLANS: The Division of Health care Financing has been takingDepartment of Health I. Internal Scan There are a variety of areas that will be impacted

Tipple, Brett

82

Student Charter Scan the QR-code  

E-Print Network (OSTI)

Student Charter 2013/2014 Scan the QR-code to obtain the online version. TechnischeUniversiteitDelft #12;#12;Student Charter 2013/2014 Delft University of Technology This is the English version of the Student Charter of Delft University of Technology, published on the TU Delft website: www

83

Scanning Probe Microscopy Studies of Carbon Nanotubes  

E-Print Network (OSTI)

Scanning Probe Microscopy Studies of Carbon Nanotubes Teri Wang Odom1 , Jason H. Hafner1 relationship between Single-Walled Carbon Nanotube (SWNT) atomic structure and electronic properties, (2, properties and application of carbon nanotube probe microscopy tips to ultrahigh resolution and chemically

Odom, Teri W.

84

Global registration of dynamic range scans for articulated model reconstruction  

Science Journals Connector (OSTI)

We present the articulated global registration algorithm to reconstruct articulated 3D models from dynamic range scan sequences. This new algorithm aligns multiple range scans simultaneously to reconstruct a full 3D model from the geometry of these scans. ... Keywords: Range scanning, animation reconstruction, articulated model, nonrigid registration

Will Chang; Matthias Zwicker

2011-05-01T23:59:59.000Z

85

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,

86

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

87

Image Charge Differential  

E-Print Network (OSTI)

Image Charge Differential Amplifier FT 0 Crude Oil Time (s) 543210 Frequency (kHz) m/z m q B f Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) uses the frequency of cyclotron motion of the ions in a static magnetic field to determine the mass-to-charge ratio, which is then used

Weston, Ken

88

Differential comparator cirucit  

DOE Patents (OSTI)

A differential comparator circuit for an Analog-to-Digital Converter (ADC) or other application includes a plurality of differential comparators and a plurality of offset voltage generators. Each comparator includes first and second differentially connected transistor pairs having equal and opposite voltage offsets. First and second offset control transistors are connected in series with the transistor pairs respectively. The offset voltage generators generate offset voltages corresponding to reference voltages which are compared with a differential input voltage by the comparators. Each offset voltage is applied to the offset control transistors of at least one comparator to set the overall voltage offset of the comparator to a value corresponding to the respective reference voltage. The number of offset voltage generators required in an ADC application can be reduced by a factor of approximately two by applying the offset voltage from each offset voltage generator to two comparators with opposite logical sense such that positive and negative offset voltages are produced by each offset voltage generator.

Hickling, Ronald M. (Simi Valley, CA)

1996-01-01T23:59:59.000Z

89

Differential transimpedance amplifier circuit for correlated differential amplification  

DOE Patents (OSTI)

A differential transimpedance amplifier circuit for correlated differential amplification. The amplifier circuit increase electronic signal-to-noise ratios in charge detection circuits designed for the detection of very small quantities of electrical charge and/or very weak electromagnetic waves. A differential, integrating capacitive transimpedance amplifier integrated circuit comprising capacitor feedback loops performs time-correlated subtraction of noise.

Gresham, Christopher A. (Albuquerque, NM); Denton, M. Bonner (Tucson, AZ); Sperline, Roger P. (Tucson, AZ)

2008-07-22T23:59:59.000Z

90

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

91

Atomic Force and Scanning Electron Microscopy of Atmospheric Particles  

E-Print Network (OSTI)

conducted so as to characterize atmospheric aerosols from anthropogenic (pollution) and natural (sea saltAtomic Force and Scanning Electron Microscopy of Atmospheric Particles ZAHAVA BARKAY,1 * AMIT 69978, Israel KEY WORDS atmospheric aerosols; atomic force microscopy; scanning electron microscopy

Shapira, Yoram

92

Differentiation Self-renewal  

E-Print Network (OSTI)

Off state Ras Ras­GAP PI3K ERK1 ERK2 Differentiation SC1 SC1 Self-renewal Ras On state GDP GTP N NN the kinase enzyme Figure 1 | Chemically induced stem-cell self-renewal. Chen et al.2 have discovered, which promotes stem-cell self-renewal. Activated Ras also switches on the enzymes ERK1 and ERK2, which

Glyde, Henry R.

93

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

94

A System Level Boundary Scan Controller Board for VME Applications  

Science Journals Connector (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

95

Scanning ARM Cloud Radars Part I: Operational Sampling Strategies  

SciTech Connect

Probing clouds in three-dimensions has never been done with scanning millimeter-wavelength (cloud) radars in a continuous operating environment. The acquisition of scanning cloud radars by the Atmospheric Radiation Measurement (ARM) program and research institutions around the world generate the need for developing operational scan strategies for cloud radars. Here, the first generation of sampling strategies for the Scanning ARM Cloud Radars (SACRs) is discussed. These scan strategies are designed to address the scientific objectives of the ARM program, however, they introduce an initial framework for operational scanning cloud radars. While the weather community uses scan strategies that are based on a sequence of scans at constant elevations, the SACRs scan strategies are based on a sequence of scans at constant azimuth. This is attributed to the cloud properties that are vastly different for rain and snow shafts that are the primary target of precipitation radars. A “cloud surveillance” scan strategy is introduced (HS-RHI) based on a sequence of horizon-to-horizon Range Height Indicator (RHI) scans that sample the hemispherical sky (HS). The HS-RHI scan strategy is repeated every 30 min to provide a static view of the cloud conditions around the SACR location. Between HS-RHI scan strategies other scan strategies are introduced depending on the cloud conditions. The SACRs are pointing vertically in the case of measurable precipitation at the ground. The radar reflectivities are corrected for water vapor attenuation and non-meteorological detection are removed. A hydrometeor detection mask is introduced based on the difference of cloud and noise statistics is discussed.

Kollias, Pavlos; Bharadwaj, Nitin; Widener, Kevin B.; Jo, Ieng; Johnson, Karen

2014-03-01T23:59:59.000Z

96

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)

97

Magnetic differential torque sensor  

SciTech Connect

A new torque sensor structure is presented. The basic idea is a simple torque sensor with a variable magnetic circuit excited by an axially magnetized permanent magnet ring. The circuit is constituted by iron toothed rings, whose teeth relative position changes whenever an applied torque twists the rotating shaft. A Hall probe measures the induction in an airgap where the induction is uniform. The new structure is an association of two previous ones, thus creating a differential system with the related advantages: diminution of thermal drifts, zero mean value for the signal. The new magnetic circuit is studied by calculating equivalent reluctances through energy calculations and by using electrical analogies.

Lemarquand, V.; Lemarquand, G. [Univ. de Savoie, Annecy-le-Vieux (France)] [Univ. de Savoie, Annecy-le-Vieux (France)

1995-11-01T23:59:59.000Z

98

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

99

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

100

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.'

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

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

102

A 3D scanning system for biomedical purposes  

Science Journals Connector (OSTI)

The use of three-dimensional (3D) scanning systems for acquiring the external shape features of biological objects has recently been gaining popularity in the biomedical field. A simple, low cost, 3D scanning system is presented, which employs ... Keywords: 3D geometric modelling, 3D scanning, EFDs, biological objects, biomedical scanners, camera calibration, data acquisition, direct linear transformation, elliptical Fourier descriptors, laser light-sectioning, medical imaging, shape features

B. D. Bradley; A. D. C. Chan; M. J. D. Hayes

2009-06-01T23:59:59.000Z

103

On Degenerate Partial Differential Equations  

E-Print Network (OSTI)

Some of recent developments, including recent results, ideas, techniques, and approaches, in the study of degenerate partial differential equations are surveyed and analyzed. Several examples of nonlinear degenerate, even mixed, partial differential equations, are presented, which arise naturally in some longstanding, fundamental problems in fluid mechanics and differential geometry. The solution to these fundamental problems greatly requires a deep understanding of nonlinear degenerate partial differential equations. Our emphasis is on exploring and/or developing unified mathematical approaches, as well as new ideas and techniques. The potential approaches we have identified and/or developed through these examples include kinetic approaches, free boundary approaches, weak convergence approaches, and related nonlinear ideas and techniques. We remark that most of the important problems for nonlinear degenerate partial differential equations are truly challenging and still widely open, which require further new ideas, techniques, and approaches, and deserve our special attention and further efforts.

Gui-Qiang G. Chen

2010-05-15T23:59:59.000Z

104

ProxiScan?: A Novel Camera for Imaging Prostate Cancer  

ScienceCinema (OSTI)

ProxiScan is a compact gamma camera suited for high-resolution imaging of prostate cancer. Developed by Brookhaven National Laboratory and Hybridyne Imaging Technologies, Inc., ProxiScan won a 2009 R&D 100 Award, sponsored by R&D Magazine to recognize t

Ralph James

2010-01-08T23:59:59.000Z

105

Fast 3D Scanning for Biometric Identification and Verification  

E-Print Network (OSTI)

Fast 3D Scanning for Biometric Identification and Verification June 2011 Authors Anselmo., & Chen, A. (2011). Fast 3D Scanning for Biometric Identification and Verification. (Prepared by RTI..................................................10 Summary and Findings for Integration of Imperceptible Structured Lighting and SIS's 3D Snapshot

McShea, Daniel W.

106

Reducing Photobleaching in STED Microscopy with Higher Scanning Speed  

E-Print Network (OSTI)

Photobleaching is a major limitation of super-resolution STED microscopy. We show that the photobleaching rate in STED microscopy is slowed down by scanning with a higher linear speed, enabled by the large field of view in our custom-built resonant-scanning STED microscope. The effect of scanning speed on photobleaching is more remarkable at higher levels of depletion laser irradiance. With a depletion irradiance of 0.4 GW/cm$^2$ (time average), we were able to slow down the photobleaching of the Atto 647N dye by 80% with 8-fold faster scanning. Photobleaching is primarily caused by the depletion light acting upon the excited fluorophores. Experimental data qualitatively agree with a theoretical model. Our results encourage further increasing linear scanning speed for photobleaching reduction in STED microscopy.

Wu, Yong

2014-01-01T23:59:59.000Z

107

Parameter Scan of an Effective Group Difference Pseudopotential Using Grid Computing 1 Parameter Scan of an Effective Group Difference  

E-Print Network (OSTI)

Parameter Scan of an Effective Group Difference Pseudopotential Using Grid Computing 1 Parameter Scan of an Effective Group Difference Pseudopotential Using Grid Computing Wibke SUDHOLT and Kim K of the actual biology/biochemistry. The ability to invoke modern grid technologies offers the ability to create

Abramson, David

108

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

109

Negative differential transmission in graphene  

Science Journals Connector (OSTI)

By using the Kubo linear response theory with the Keldysh Green function approach, we investigate the mechanism leading to the negative differential transmission in a system with the equilibrium electron density much smaller than the photon-excited one. It is shown that the negative differential transmission can appear at low probe-photon energy (in the order of the scattering rate) or at high energy (much larger than the scattering rate). For the low probe-photon energy case, the negative differential transmission is found to come from the increase of the intraband conductivity due to the large variation of electron distribution after the pumping. As for the high probe-photon energy case, the negative differential transmission is shown to tend to appear with the hot-electron temperature being closer to the equilibrium one and the chemical potential higher than the equilibrium one but considerably smaller than half of the probe-photon energy. We also show that this negative differential transmission can come from both the inter- and the intraband components of the conductivity. Especially, for the interband component, its contribution to the negative differential transmission is shown to come from both the Hartree-Fock self-energy and the scattering. Furthermore, the influence of the Coulomb-hole self-energy is also addressed.

B. Y. Sun and M. W. Wu

2013-12-17T23:59:59.000Z

110

Scanning probe microscopy with inherent disturbance suppression using micromechanical systems  

E-Print Network (OSTI)

All scanning probe microscopes (SPMs) are affected by disturbances, or mechanical noise, in their environments which can limit their imaging resolution. This thesis introduces a general approach for suppressing out-of-plane ...

Sparks, Andrew William, 1977-

2005-01-01T23:59:59.000Z

111

Sub-Kelvin scanning tunneling microscopy on magnetic molecules.  

E-Print Network (OSTI)

??Magnetic molecules have attracted lots interest. In this work, an ultra-stable and low noise scanning tunneling microscopy operating at 400 mK using He-3 (930 mK… (more)

Zhang, Lei

2012-01-01T23:59:59.000Z

112

Surface skeleton generation based on 360-degree profile scan  

E-Print Network (OSTI)

A rapid prototyping method is invented, which works on a specific data structure produced by an optical metrology technique: 360-degree surface profile scanning. A computer algorithm takes an object profile data, restructure ...

Chen, Lujie

113

Information efficiency of line-scan imaging mechanisms  

Science Journals Connector (OSTI)

Information theory is used to formulate a single figure of merit for assessing the performance of line-scan imaging systems as a function of their spatial response (PSF or MTF),...

Huck, F O; Halyo, N; Park, S K

1981-01-01T23:59:59.000Z

114

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 C C O O...

115

Dynamic study of tunable stiffness scanning microscope probe  

E-Print Network (OSTI)

This study examines the dynamic characteristics of the in-plane tunable stiffness scanning microscope probe for an atomic force microscope (AFM). The analysis was carried out using finite element analysis (FEA) methods for ...

Vega González, Myraida Angélica

2005-01-01T23:59:59.000Z

116

System Provides Clear Brain Scans of Awake, Unrestrained Mice...  

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

System Provides Clear Brain Scans of Awake, Unrestrained Mice dynamic imaging of mice Three markers attached to the head of a mouse enable the AwakeSPECT system to obtain detailed,...

117

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

118

Multi-atlas segmentation in head and neck CT scans  

E-Print Network (OSTI)

We investigate automating the task of segmenting structures in head and neck CT scans, to minimize time spent on manual contouring of structures of interest. We focus on the brainstem and left and right parotids. To generate ...

Arbisser, Amelia M

2012-01-01T23:59:59.000Z

119

Observing Warm Clouds in 3D Using ARM Scanning Cloud  

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

Observing Warm Clouds in 3D Using ARM Scanning Cloud Radars and a Novel Ensemble Method For original submission and image(s), see ARM Research Highlights http:www.arm.gov...

120

Construction of an ultra-low temperature scanning tunneling microscope  

Science Journals Connector (OSTI)

We describe designs and specifications of an ultra-low temperature scanning tunneling microscope developed at ... works over a wide temperature range between 90 mK and 300 K with atomic resolution as...

Hiroshi Fukuyama; Hiroki Tan; Tetsuya Handa…

1996-01-01T23:59:59.000Z

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

First Observations of Tracking Clouds Using Scanning ARM Cloud Radars  

Science Journals Connector (OSTI)

Tracking clouds using scanning cloud radars can help to document the temporal evolution of cloud properties well before large-drop formation (weather radar “first echo”). These measurements also complement cloud and precipitation tracking using ...

Paloma Borque; Pavlos Kollias; Scott Giangrande

2014-12-01T23:59:59.000Z

122

Detection of bone disease in dogs by radioisotope scanning  

E-Print Network (OSTI)

, delayed union, and nonunion), osteomyelitis, degenerative arthritis, surgical osteotomy, i'ibrous dysplasia, osteochondromatosie, and growing epiphyses. Radioisotopic scanning has been reported 12 for studying the metabolism of Fluorine-18 in dogs 9..., ( 1962): 95-104. 2. Bauer, G. C. H. , and Smith, E. M. r Sr 85 Sointimetry in Osteoarthritis of the Knee. J . Nucl. Med. , 10, (Mar. , 1969): 109-116. Blau, M. , Nagler, W. , and Bender, M. A. : Fluorine ? 18. A New Isotope for Bone Scanning. J. Nucl...

Morris, Earl Louis

2012-06-07T23:59:59.000Z

123

CMOS ROM arrays programmable by laser beam scanning  

E-Print Network (OSTI)

CMOS ROM ARRAYS PROGRAMMABLE BY LASER BEAM SCANNING A Thesis bY JONG JUNE LEE Submitted to the Graduate College of Texas ASM University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE May 1984 Major Subject... : Electrical Engineering CMOS ROM ARRAYS PROGRAMMABLE BY LASER BEAM SCANNING A Thesis by JONGJUNE LEE Approved as to style and content by: Noel R. Strader II (Chairman of Committee) Philli E. Allen (Member) Philip S. Noe (Member) Daniel Colunga...

Lee, Jongjune

2012-06-07T23:59:59.000Z

124

Pencil Beam Scanning System Based On A Cyclotron  

SciTech Connect

Sumitomo Heavy Industries, Ltd. (SHI) has developed a new pencil beam scanning system (PBS) for proton therapy in collaboration with National Cancer Center Hospital East (NCCHE). Taking advantage of the continuous beam from the cyclotron P235, the line scanning method is employed in order to realize continuous irradiation with high dose rate. 3D uniform and sphere field was irradiated and compared with the simulation.

Tachikawa, Toshiki; Nonaka, Hideki; Kumata, Yukio [Sumitomo Heavy Industries, Ltd., 5-2 Soubiraki-cho, Niihama, Ehime 792-8588 (Japan); Nishio, Teiji; Ogino, Takashi [National Cancer Center Hospital East, 6-5-1 Kashiwanoha, Kashiwa, Chiba 277-8577 (Japan)

2011-06-01T23:59:59.000Z

125

LINEAR SCANNING METHOD BASED ON THE SAFT COARRAY  

SciTech Connect

This work presents a method to obtain B-scan images based on linear array scanning and 2R-SAFT. Using this technique some advantages are obtained: the ultrasonic system is very simple; it avoids the grating lobes formation, characteristic in conventional SAFT; and subaperture size and focussing lens (to compensate emission-reception) can be adapted dynamically to every image point. The proposed method has been experimentally tested in the inspection of CFRP samples.

Martin, C. J.; Martinez-Graullera, O.; Romero, D.; Ullate, L. G. [Instituto de Automatica Industrial-CSIC, Carretera de Campo Real, km 0.200, La Poveda, Arganda del Rey, Madrid, E-28500 (Spain); Higuti, R. T. [UNESP-Universidade Estadual Paulista, Dep. Electrical Engineering, Av. Brasil, 56, 15385-000, Ilha Solteira, SP (Brazil)

2010-02-22T23:59:59.000Z

126

The StarScan plate measuring machine: overview and calibrations  

E-Print Network (OSTI)

The StarScan machine at the U.S. Naval Observatory (USNO) completed measuring photographic astrograph plates to allow determination of proper motions for the USNO CCD Astrograph Catalog (UCAC) program. All applicable 1940 AGK2 plates, about 2200 Hamburg Zone Astrograph plates, 900 Black Birch (USNO Twin Astrograph) plates, and 300 Lick Astrograph plates have been measured. StarScan comprises of a CCD camera, telecentric lens, air-bearing granite table, stepper motor screws, and Heidenhain scales to operate in a step-stare mode. The repeatability of StarScan measures is about 0.2 micrometer. The CCD mapping as well as the global table coordinate system has been calibrated using a special dot calibration plate and the overall accuracy of StarScan x,y data is derived to be 0.5 micrometer. Application to real photographic plate data shows that position information of at least 0.65 micrometer accuracy can be extracted from course grain 103a-type emulsion astrometric plates. Transformations between "direct" and "reverse" measures of fine grain emulsion plate measures are obtained on the 0.3 micrometer level per well exposed stellar image and coordinate, which is at the limit of the StarScan machine.

Norbert Zacharias; Lars Winter; Ellis Holdenried; Jean-Pierre de Cuyper; Ted Rafferty; Gary Wycoff

2008-06-02T23:59:59.000Z

127

E-Print Network 3.0 - analyzer vertically scanning Sample Search...  

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

University, New York, NY 10027 Effects of Scanning Schemes on Laser Tube Bending Four laser... scanning schemes for tube bending, including point-source circumferential ......

128

E-Print Network 3.0 - analytical scanning electron Sample Search...  

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

Electron Microscope Philips CM20 Analytical Scanning... during formation of the carbide particles. 12;Philips CM20 Analytical Scanning Transmission Electron... at SCSAM ...

129

Differential geometry of equilibrium thermodynamics  

Science Journals Connector (OSTI)

In the present paper, extending the Weinhold theory, we obtain some differential-geometry properties of the ideal gas and the ideal paramagnetic gas. In particular, we show that the scalar curvature of the ideal paramagnetic gas can be a function of temperature.

Mijat Mijatovi?; Valentina Veselinovi?; Kostadin Trenevski

1987-02-15T23:59:59.000Z

130

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

131

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

132

The scanning Compton polarimeter for the SLD experiment  

SciTech Connect

For the 1994/95 run of the SLD experiment at SLAC, a Compton polarimeter measured the luminosity-weighted electron beam polarization to be (77.2 {+-} 0.5)%. This excellent accuracy is achieved by measuring the rate asymmetry of Compton-scattered electrons near the kinematic endpoint. The polarimeter takes data continuously while the electron and positron beams are in collision and achieves a statistical precision of better than 1% in a three minute run. To calibrate the polarimeter and demonstrate its accuracy, many scans are frequently done. These include scans of the laser polarization, the detector position with respect to the kinematic edge, and the laser power.

Woods, M.; SLD Collaboration

1996-10-01T23:59:59.000Z

133

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

Science Journals Connector (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

134

Insight into the Molecular Arrangement of High-Density Polyethylene Polymer Chains in Blends of Polystyrene/High-  

E-Print Network (OSTI)

Insight into the Molecular Arrangement of High-Density Polyethylene Polymer Chains in Blends of Polystyrene/High- Density Polyethylene from Differential Scanning Calorimetry and Raman Techniques JAYANT/high-density polyethylene (PS/HDPE) blends were synthe- sized by melt blending in a single screw extruder. Co

135

Novel Phase Change Inks for Printing Three-Dimensional Veronika Chovancova-Lovell ,  

E-Print Network (OSTI)

-dimensional (3D) printing comprising different waxes, tackifier and plasticizer resins, rheology modifiers in a conventional phase- change printer in order to create 3D printed structures. Differential scanning calorimetry, a low viscosity binder is printed onto a powder coating to fuse materials together in a pattern. 3D

Fleming, Paul D. "Dan"

136

Characterization of Lithium Stearate: Processing Aid for Filled Elastomers  

SciTech Connect

This topical report presents work completed to characterize lithium stearate so a replacement supplier could be identified. Lithium stearate from Alfa Aesar and Chemtura was obtained and characterized along with the current material from Witco. Multiple methods were used to characterize the materials including Karl Fischer, FT-IR, differential scanning calorimetry, and thermogravimetric analysis.

E. Eastwood; C. Densmore

2007-02-05T23:59:59.000Z

137

Journal of Alloys and Compounds 436 (2007) 131141 Experimental investigation of the Mg Al Ca system  

E-Print Network (OSTI)

Journal of Alloys and Compounds 436 (2007) 131­141 Experimental investigation of the Mg Al Ca investigation of the ternary Mg Al Ca system using differential scanning calorimetry (DSC), X- ray diffraction modeling was verified experimentally and found to occur at 513 C with composition close to 10.8 at.% Ca

Medraj, Mamoun

138

International Scan on Pedestrian and Bicyclist Safety and Mobility  

E-Print Network (OSTI)

­ Differences in culture and behavior, but these can adapt over time ­ Typical safety evaluations mayInternational Scan on Pedestrian and Bicyclist Safety and Mobility: May 2009 Sponsored by Federal Pedestrian and Bicyclist Safety and Mobility ­ Policy ­ Engineering ­ Education ­ Enforcement · Safe Routes

Bertini, Robert L.

139

Scanning tunneling spectroscopy of suspended single-wall carbon nanotubes  

E-Print Network (OSTI)

Scanning tunneling spectroscopy of suspended single-wall carbon nanotubes B. J. LeRoy,a) S. G-wall carbon nanotubes that are freely suspended over a trench. The nanotubes were grown by chemical vapor on the freestanding portions of the nanotubes. Spatially resolved spectroscopy on the suspended portion of both

Dekker, Cees

140

Sample heating in near-field scanning optical microscopy  

E-Print Network (OSTI)

Heating near the aperture of aluminumcoated,fiber opticnear-field scanning optical microscopy probes was studied as a function of input and output powers. Using the shear-force feedback method, near-field probes were positioned nanometers above a...

Erickson, Elizabeth S.; Dunn, Robert C.

2005-10-05T23:59:59.000Z

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

Surround structured lighting: 3-D scanning with orthographic illumination  

Science Journals Connector (OSTI)

This paper presents a new system for rapidly acquiring complete 3-D surface models using a single orthographic structured light projector, a pair of planar mirrors, and one or more synchronized cameras. Using the mirrors, we project structured light ... Keywords: 3-D reconstruction, Full object scanning, Gray codes, Orthographic projection, Structured lighting

Douglas Lanman; Daniel Crispell; Gabriel Taubin

2009-11-01T23:59:59.000Z

142

Icon Scanning: Towards Next Generation QR Codes Itamar Friedman  

E-Print Network (OSTI)

Icon Scanning: Towards Next Generation QR Codes Itamar Friedman Technion Haifa, Israel itamarf-friendly way to obtain this particular applica- tion could be by taking a snapshot of its corresponding icon be thought of as icons with a binary pattern. In this paper we extend this to App-icons and propose

Zelnik-Manor, Lihi - Zelnik-Manor, Lihi

143

ProScan IITM 1 Table of Contents  

E-Print Network (OSTI)

an Existing Stage 19 4.2 Fitting the ProScan Stage 19 4.3 Cable Connections 20 4.4 USB Operation 20 4.5 Focus only to designated power sources as marked on the product. · Make sure the electrical cord is located manufacturers overstate thei

Gardel, Margaret

144

A Rapid Scanning Inspection Method for Insulated Ferromagnetic Tubing  

E-Print Network (OSTI)

Until the present there has been no effective way to rapidly scan thermally insulated refinery or process piping for corrosion or thin wall. Such defects, if left unattended, can lead to wasteful losses of time, energy and money. To date the most...

Marsh, G. M.; Milewits, M.

1984-01-01T23:59:59.000Z

145

Laser scanning third-harmonic-generation microscopy in biology  

E-Print Network (OSTI)

. Denk, J. H. Stricker and W. W. Webb, "Two-photon laser scanning fluorescence microscopy," Science 248, 73-76 (1990). 3. S. Maiti, J. B. Shear, R. M. Williams, W. R. Zipfel and W. W. Webb, "Measuring-214 (1996). 6. R. Hellwarth and P. Christensen, "Nonlinear optical microscopic examination of structure

Silberberg, Yaron

146

Nmap in the Enterprise: Your Guide to Network Scanning  

Science Journals Connector (OSTI)

Nmap, or Network Mapper, is a free, open source tool that is available under the GNU General Public License as published by the Free Software Foundation. It is most often used by network administrators and IT security professionals to scan corporate ... Keywords: Networking, Security

Angela Orebaugh; Becky Pinkard

2008-02-01T23:59:59.000Z

147

Inverse scattering for rotationally scanned optical coherence tomography  

E-Print Network (OSTI)

Inverse scattering for rotationally scanned optical coherence tomography Daniel L. Marks, Tyler S May 16, 2006; posted May 26, 2006 (Doc. ID 67358) Optical coherence tomography of luminal structures coherence tomography1,2 (OCT), is determined in large part by the degree to which the images provide

Bhargava, Rohit

148

A novel image hash algorithm resistant to print-scan  

Science Journals Connector (OSTI)

With the rapid development of multimedia technology, how to establish the integrity of images has become an unavoidable problem. The transform between a digital image and its hard-copy makes the problem more complex. To simplify the content based authentication, ... Keywords: Image hashing, Perceptual hashing, Print, Radon, Scan, Wavelet

Di Wu; Xuebing Zhou; Xiamu Niu

2009-12-01T23:59:59.000Z

149

3D Scanning for Biometric Identification and Verification  

E-Print Network (OSTI)

June 2010 3D Scanning for Biometric Identification and Verification Project Leads Anselmo Lastra visibility, cannot be controlled. A relatively new biometric, 3D facial recognition, holds great promise performance using 3D shape and texture matched that of the much more mature technologies of high

McShea, Daniel W.

150

Processing data from scanning gauges on industrial web processes  

Science Journals Connector (OSTI)

This paper considers the processing of data collected by scanning gauges from industrial web processes such as metal rolling, coating, paper making and plastic film extrusion. It describes a method based upon the generalised sampling theorem for reconstructing ... Keywords: Cross-directional control, Gauging, Sampling, Two-dimensional systems, Web processes

Stephen Duncan; Peter Wellstead

2004-03-01T23:59:59.000Z

151

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

152

18.03 Differential Equations, Spring 2006  

E-Print Network (OSTI)

Differential Equations are the language in which the laws of nature are expressed. Understanding properties of solutions of differential equations is fundamental to much of contemporary science and engineering. Ordinary ...

Miller, Haynes

153

Bioelectrical SPMs (G. Gomila, UB-IBEC) Bioelectric Scanning Probe Microscopies  

E-Print Network (OSTI)

-ups: Micropippete based electrodes Measurements of cell membrane ion transport on single cells 2. Scanning Ion (SNOM),Scanning Tunneling Microscope (STM), Scanning Ion Conductance Microscope (SICM), Scanning Conductance Microscopy #12;7 Bioelectrical SPMs (G. Gomila, UB-IBEC) Single ion channels recordings Average

Ritort, Felix

154

Commuting higher rank ordinary differential operators  

E-Print Network (OSTI)

In this paper we discuss some results related to commuting ordinary differential operators of rank greater than one.

Andrey E. Mironov

2012-04-10T23:59:59.000Z

155

DIFFERENTIAL IMPACT OF SICKLE CELL TRAIT ON ...  

E-Print Network (OSTI)

877–898. DIFFERENTIAL IMPACT OF SICKLE CELL TRAIT ON. SYMPTOMATIC AND ASYMPTOMATIC MALARIA. Eunha Shim. Department of Epidemiology.

2012-10-11T23:59:59.000Z

156

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

157

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

158

Monte Carlo simulation of gamma ray scanning gauge  

SciTech Connect

A gamma ray scanning gauge was simulated with Monte Carlo to study the properties of gamma scanning gauges and to resolve the counts coming from a {sup 235}U source from those coming from a contaminant ({sup 232}U) whose daughters emit high energy gamma rays. The simulation has been used to infer the amount of the {sup 232}U contaminant in a {sup 235}U source to select the best size for the NaI(Tl) detector crystal to minimize the effect of the contaminant. The results demonstrate that Monte Carlo simulation provides a systematic tool for designing a gauge with desired properties and for estimating properties of the gamma source from measured count rates.

Hartfield, G.L.; Freeman, L.B.; Dei, D.E.; Emert, C.J.; Glickstein, S.S.; Kahler, A.C.; Niedzwecki, P.F.

1990-12-31T23:59:59.000Z

159

Synchronized monochromator and insertion device energy scans at SLS  

SciTech Connect

Synchronous monochromator and insertion device energy scans were implemented at the Surfaces/Interfaces:Microscopy (SIM) beamline in order to provide the users fast X-ray magnetic dichroism studies (XMCD). A simple software control scheme is proposed based on a fast monochromator run-time energy readback which quickly updates the insertion device requested energy during an on-the-fly X-ray absorption scan (XAS). In this scheme the Plain Grating Monochromator (PGM) motion control, being much slower compared with the insertion device (APPLE-II type undulator), acts as a 'master' controlling the undulator 'slave' energy position. This master-slave software implementation exploits EPICS distributed device control over computer network and allows for a quasi-synchronous motion control combined with data acquisition needed for the XAS or XMCD experiment.

Krempasky, J.; Flechsig, U.; Korhonen, T.; Zimoch, D.; Quitmann, Ch.; Nolting, F. [Paul Scherrer Institut, Villigen, Swiss Light Source, 5235 Villigen PSI (Switzerland)

2010-06-23T23:59:59.000Z

160

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

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

Differential probes aid flow measurement  

SciTech Connect

Nonconstricting differential pressure flow probes which help solve the problems of clogging, wear, and pressure loss at the Seawater Filtration Facility in Saudi Arabia are described. Treated seawater is pumped into oil-bearing formations for secondary recovery. Figures showing principle of operation for probes, installation schematic and long-term accuracy results (flow probes vs. orifice meters) are presented. The new diamond-shaped design flow sensor offers accurate flow measurement with low permanent pressure loss, which translates into cost savings for the operator.

Mesnard, D.R.

1982-07-01T23:59:59.000Z

162

Metastatic cardiac tumor demonstrated by 201 thallium scan  

SciTech Connect

A patient with bronchogenic carcinoma had an electrocardiogram that was initially thought to be consistent with myocardial infarction and possible left ventricular aneurysm. A heart scan with radioactive 201 thallium showed an area of sharply diminished uptake cold spot; however, subsequent thoracotomy showed that this was caused by local pericardial and myocardial infiltration by tumor. This suggests a role for radioactive 201 thallium in the detection of cardiac metastatic tumors.

Lubell, D.L.; Goldfarb, C.R.

1980-07-01T23:59:59.000Z

163

A novel solid-angle tomosynthesis (SAT) scanning scheme  

SciTech Connect

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

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

2010-08-15T23:59:59.000Z

164

Alignment and Aperture Scan at the Fermilab Booster  

SciTech Connect

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

165

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

166

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

SciTech Connect

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.

Nelson, George J.; Harris, William H.; Lombardo, Jeffrey J.; Izzo, Jr., John R.; Chiu, W. K. S.; Tanasini, Pietro; cantoni, Marco; Van herle, Jan; Comninellis, Christos; Andrews, Joy C.; Liu, Yijin; Pianetta, Piero; Chu, Yong

2011-01-01T23:59:59.000Z

167

Indecomposability for differential algebraic groups James Freitag  

E-Print Network (OSTI)

Indecomposability for differential algebraic groups James Freitag freitag@math.berkeley.edu Department of Mathematics University of California, Berkeley 970 Evans Hall Berkeley, CA 94720-3840 Abstract

168

304 MATLAB.7 Partial Differential Equations  

E-Print Network (OSTI)

304. MATLAB.7. Partial Differential Equations. Solving the Heat Equation . Consider the problem. The Fourier sine coefficients for f are b (m) = (cos (m*pi/ 2) -cos ...

169

Observation of diamond turned OFHC copper using Scanning Tunneling Microscopy  

SciTech Connect

Diamond turned OFHC copper samples have been observed within the past few months using the Scanning Tunneling Microscope. Initial results have shown evidence of artifacts which may be used to better understand the diamond turning process. The STM`s high resolution capability and three dimensional data representation allows observation and study of surface features unobtainable with conventional profilometry systems. Also, the STM offers a better quantitative means by which to analyze surface structures than the SEM. This paper discusses findings on several diamond turned OFHC copper samples having different cutting conditions. Each sample has been cross referenced using STM and SEM.

Grigg, D.A.; Russell, P.E.; Dow, T.A.

1988-12-01T23:59:59.000Z

170

E-Print Network 3.0 - analysing laser-scanned digital Sample...  

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

laser-scanned digital Search Powered by Explorit Topic List Advanced Search Sample search results for: analysing laser-scanned digital Page: << < 1 2 3 4 5 > >> 1 This special...

171

Knowledge and heuristic-based modeling of laser-scanned trees  

Science Journals Connector (OSTI)

We present a semi-automatic and efficient method for producing full polygonal models of range scanned trees, which are initially represented as sparse ... Keywords: Digitizing and scanning, knowledge-based modeling

Hui Xu; Nathan Gossett; Baoquan Chen

2007-10-01T23:59:59.000Z

172

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...

Rivas Cardona, Juan Alberto

2009-06-02T23:59:59.000Z

173

Evaluation of hole quality and bit life in graphite epoxy composites using video scanning  

E-Print Network (OSTI)

scanning, (6) penetrant (conventional), (7) infrared scanning, and six other methods. It appears that flouroscopy is the most promising method developed to date. Video scan- ning was rated fifth because it is not effective as the sole criterion for edge... inspection, (3) the surface flaw area as determined by video scanning, (4) the size of entrance delaminations by manual inspection, (5) the maximum wear land development of the drill bits, (6) the average wear land development of the drill bits, (7...

Lednicky, Thomas Edward

2012-06-07T23:59:59.000Z

174

LASER SCANNING AND NOISE REDUCTION APPLIED TO 3D ROAD SURFACE ANALYSIS  

E-Print Network (OSTI)

LASER SCANNING AND NOISE REDUCTION APPLIED TO 3D ROAD SURFACE ANALYSIS Thorsten Schulz and Hilmar, EAWAG Email: michele.steiner@eawag.ch Abstract: Terrestrial laser scanning was applied to acquire 3D the catchment area of a road with respect to a pilot plant. As laser scanning requires only a few minutes

Giger, Christine

175

Improving the detection ...1 Improving the detection of On-line Vertical Port Scan  

E-Print Network (OSTI)

Improving the detection ...1 Improving the detection of On-line Vertical Port Scan Improving the detection of On-line Vertical Port Scan in IP Traffic Yousra Chabchoub , Christine Fricker and Philippe to detect port scan attacks in IP traffic. Only relevant information about destination IP addresses

Paris-Sud XI, Université de

176

Inserting Test Points to Control Peak Power During Scan Testing Ranganathan Sankaralingam and Nur A. Touba  

E-Print Network (OSTI)

simply reducing the average power dissipation per clock cycle. Proceedings of the 17th IEEE International. The average power dissipation during scan testing can be controlled by reducing the scan frequency. However, the peak power during scan testing cannot be controlled by reducing clock frequency and hence is more

Touba, Nur A.

177

On the selection of a partial scan path with respect to target faults  

Science Journals Connector (OSTI)

Today the most often applied DFT-strategy is full scan path. To reduce its overhead a partial scan path can be selected. For minimizing the size of the partial scan path, existing testpatterns are used which will detect a part of the faults. Only the ...

Harald Gundlach; Bernd Koch; Klaus-Dieter Müller-Glaser

1991-02-01T23:59:59.000Z

178

Low-cost wearable low-vision aid using a handmade retinal light-scanning microdisplay  

E-Print Network (OSTI)

scanning fiber display6 to present icons indicating the location of potential hazards. The scanning fiberLow-cost wearable low-vision aid using a handmade retinal light-scanning microdisplay Ryland C) is a portable system that uses machine vision to track potential walking hazards for the visually impaired

Washington at Seattle, University of

179

Negative differential resistance in electron tunneling in ultrathin films near the two-dimensional limit  

SciTech Connect

We report on our observation of negative differential resistance (NDR) in electron tunneling conductance in atomic-scale ultrathin Ag films on Si(111) substrates. NDR was observed by scanning tunneling spectroscopy measurements. The tunneling conductance depends on the electronic local density of states (LDOS) of the sample. We show that the sample bias voltage, at which negative differential resistance and peak negative conductance occur, depends on the film thickness. This can be understood from the variation in the LDOS of the Ag films as a function of film thickness down to the two-dimensional limit of one atomic layer. First principles density functional theory calculations have been used to explain the results.

Batabyal, R.; Abdul Wasey, A. H. M.; Mahato, J. C.; Das, Debolina; Roy, A.; Das, G. P.; Dev, B. N. [Department of Materials Science, Indian Association for the Cultivation of Science, 2A and 2B Raja S. C. Mullick Road, Jadavpur, Kolkata 700032 (India)

2013-01-21T23:59:59.000Z

180

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

SciTech Connect

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

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

Nukbone® promotes proliferation and osteoblastic differentiation of mesenchymal stem cells from human amniotic membrane  

SciTech Connect

Highlights: •Nukbone showed to be a good scaffold for adhesion, proliferation and differentiation of stem cells. •Nukbone induced osteoblastic differentiation of human mesenchymal stem cells. •Results showed that Nukbone offer an excellent option for bone tissue regeneration due to properties. -- Abstract: Bovine bone matrix Nukbone® (NKB) is an osseous tissue-engineering biomaterial that retains its mineral and organic phases and its natural bone topography and has been used as a xenoimplant for bone regeneration in clinics. There are not studies regarding its influence of the NKB in the behavior of cells during the repairing processes. The aim of this research is to demonstrate that NKB has an osteoinductive effect in human mesenchymal stem cells from amniotic membrane (AM-hMSCs). Results indicated that NKB favors the AM-hMSCs adhesion and proliferation up to 7 days in culture as shown by the scanning electron microscopy and proliferation measures using an alamarBlue assay. Furthermore, as demonstrated by reverse transcriptase polymerase chain reaction, it was detected that two gene expression markers of osteoblastic differentiation: the core binding factor and osteocalcin were higher for AM-hMSCs co-cultured with NKB in comparison with cultivated cells in absence of the biomaterial. As the results indicate, NKB possess the capability for inducing successfully the osteoblastic differentiation of AM-hMSC, so that, NKB is an excellent xenoimplant option for repairing bone tissue defects.

Rodríguez-Fuentes, Nayeli; Rodríguez-Hernández, Ana G. [Depto. Microbiología y Parasitología, Facultad de Medicina, Universidad Nacional Autónoma de México (UNAM), Mexico City 04510 (Mexico)] [Depto. Microbiología y Parasitología, Facultad de Medicina, Universidad Nacional Autónoma de México (UNAM), Mexico City 04510 (Mexico); Enríquez-Jiménez, Juana [Depto. Biología de la Reproducción, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán (INCMNSZ), México City 14000 (Mexico)] [Depto. Biología de la Reproducción, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán (INCMNSZ), México City 14000 (Mexico); Alcántara-Quintana, Luz E. [Subd. de Investigación, Centro Nacional de la Transfusión Sanguínea, Secretaria de Salud, Mexico City 07370 (Mexico)] [Subd. de Investigación, Centro Nacional de la Transfusión Sanguínea, Secretaria de Salud, Mexico City 07370 (Mexico); Fuentes-Mera, Lizeth [Depto. Biología Molecular e Histocompatibilidad, Hospital General “Dr. Manuel Gea González”, México City 4800 (Mexico)] [Depto. Biología Molecular e Histocompatibilidad, Hospital General “Dr. Manuel Gea González”, México City 4800 (Mexico); Piña-Barba, María C. [Depto. Materiales Metálicos y Cerámicos, Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México (UNAM), México City 04510 (Mexico)] [Depto. Materiales Metálicos y Cerámicos, Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México (UNAM), México City 04510 (Mexico); Zepeda-Rodríguez, Armando [Depto. Biología Celular y Tisular, Facultad de Medicina, Universidad Nacional Autónoma de México (UNAM), México City 04510 (Mexico)] [Depto. Biología Celular y Tisular, Facultad de Medicina, Universidad Nacional Autónoma de México (UNAM), México City 04510 (Mexico); and others

2013-05-10T23:59:59.000Z

182

Curvature-directed Crystallization of Polymer Dielectrics in Nanopores  

E-Print Network (OSTI)

. .............................................................................................................. 13 Figure 5. Heating (a) and cooling (b) DSC scans of bulk-iPP, iPP-200, iPP-40 and iPP-15; (c) an expanded view of the low-temperature exothermic peaks from (b). The scan rate was 10 o... at 80 oC to remove residual solvent. Differential scanning calorimetry scans of the sample before and after recrystallization reveal stark differences, Figure 2. Firstly, the exothermic peak maximum shifted from 125 oC to 111 oC following...

Reid, Dariya

2013-11-26T23:59:59.000Z

183

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

184

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

185

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)

186

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 {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

187

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

188

The early history of the scanning electron microscope  

Science Journals Connector (OSTI)

The article begins with an account of prewar German work particularly that of von Ardenne who established the theoretical basis of a scanning electron microscope and constructed an instrument which was primarily intended to overcome chromatic aberration when relatively thick specimens were examined by transmission. Neither this microscope nor a different one built a few years later in the U. S. A. attained sufficient resolution to gain acceptance and the reasons for this are examined. The remainder of the article deals with work carried out in the Cambridge University Engineering Department over the years from 1948 to about 1965 when the first successful commercial instrument was produced. The contributions made by successive research students are explained as are also the nonscientific factors which influenced the course of the development.

C. W. Oatley

1982-01-01T23:59:59.000Z

189

Scanning Hall probe microscopy of a diluted magnetic semiconductor  

SciTech Connect

We have measured the micromagnetic properties of a diluted magnetic semiconductor as a function of temperature and applied field with a scanning Hall probe microscope built in our laboratory. The design philosophy for this microscope and some details are described. The samples analyzed in this work are Ga{sub 0.94}Mn{sub 0.06}As films grown by molecular beam epitaxy. We find that the magnetic domains are 2-4 mum wide and fairly stable with temperature. Magnetic clusters are observed above T{sub C}, which we ascribe to MnAs defects too small and sparse to be detected by a superconducting quantum interference device magnetometer.

Kweon, Seongsoo [Materials Science and Engineering, University of Texas at Austin, Austin, Texas 78712 (United States); Samarth, Nitin [Physics Department, Penn State University, University Park, Pennsylvania 16802 (United States); Lozanne, Alex de [Materials Science and Engineering, University of Texas at Austin, Austin, Texas 78712 (United States); Department of Physics, University of Texas at Austin, Austin, Texas 78712 (United States)

2009-05-01T23:59:59.000Z

190

Combined Scanning Transmission Electron Microscopy Tilt- and Focal Series  

SciTech Connect

In this study, a combined tilt- and focal series is proposed as a new recording scheme for high-angle annular dark-field scanning transmission electron microscopy (STEM) tomography. Three-dimensional (3D) data were acquired by mechanically tilting the specimen, and recording a through-focal series at each tilt direction. The sample was a whole-mount macrophage cell with embedded gold nanoparticles. The tilt focal algebraic reconstruction technique (TF-ART) is introduced as a new algorithm to reconstruct tomograms from such combined tilt- and focal series. The feasibility of TF-ART was demonstrated by 3D reconstruction of the experimental 3D data. The results were compared with a conventional STEM tilt series of a similar sample. The combined tilt- and focal series led to smaller missing wedge artifacts, and a higher axial resolution than obtained for the STEM tilt series, thus improving on one of the main issues of tilt series-based electron tomography.

Dahmen, Tim [German Research Center for Artificial Intelligence (DFKI), Germany] [German Research Center for Artificial Intelligence (DFKI), Germany; Baudoin, Jean-Pierre G [ORNL] [ORNL; Lupini, Andrew R [ORNL] [ORNL; Kubel, Christian [Karlsruhe Institute of Technology, Leopoldshafen, Germany] [Karlsruhe Institute of Technology, Leopoldshafen, Germany; Slusallek, Phillip [German Research Center for Artificial Intelligence (DFKI), Germany] [German Research Center for Artificial Intelligence (DFKI), Germany; De Jonge, Niels [ORNL] [ORNL

2014-01-01T23:59:59.000Z

191

A new scanning photoemission microscope for ELETTRA: SuperMAXIMUM  

Science Journals Connector (OSTI)

High brightness third?generation synchrotrons allow diffraction?limited performance and large flux for scanning photoemission microscopes. A new microscope SuperMAXIMUM is being developed at the University of Wisconsin Center for X ray Lithography in collaboration with the Sincrotrone Trieste. The beamline being built in Trieste uses a variable angle spherical gratingmonochromator (VASGM). A combination of rotation of a plane mirror and rotation of the spherical grating keeps the slit positions and beam directions fixed. The microscope objectives are normal?incidence multilayer?coated Schwarzschild objectives. The project which is nearing completion utilizes novel designs for optics alignment sample rastering mechanics and software control. We will discuss the project status new designs and techniques.

John T. Welnak; H. Solak; J. Wallace; F. Cerrina; F. Barbo; M. Bertolo; A. Bianco; S. Di Fonzo; S. Fontana; W. Jark; F. Mazzolini; R. Rosei; A. Savoia; J.H. Underwood; G. Margaritondo

1996-01-01T23:59:59.000Z

192

A new scanning photoemission microscope for ELETTRA: SuperMAXIMUM  

SciTech Connect

High brightness, third-generation synchrotrons allow diffraction-limited performance and large flux for scanning photoemission microscopes. A new microscope, SuperMAXIMUM, is being developed at the University of Wisconsin Center for X ray Lithography in collaboration with the Sincrotrone Trieste. The beamline, being built in Trieste, uses a variable angle spherical grating monochromator (VASGM). A combination of rotation of a plane mirror and rotation of the spherical grating keeps the slit positions and beam directions fixed. The microscope objectives are normal-incidence, multilayer-coated Schwarzschild objectives. The project, which is nearing completion, utilizes novel designs for optics alignment, sample rastering mechanics, and software control. We will discuss the project status, new designs, and techniques. {copyright} {ital 1996 American Institute of Physics.}

Welnak, J.T.; Solak, H.; Wallace, J.; Cerrina, F.; Barbo, F.; Bertolo, M.; Bianco, A.; Di Fonzo, S.; Fontana, S.; Jark, W.; Mazzolini, F.; Rosei, R.; Savoia, A.; Underwood, J.; Margaritondo, G. [University of WI--Center for X ray Lithography, 3731 Schneider Drive, Stoughton, WI 53589 (United States)] [University of WI--Center for X ray Lithography, 3731 Schneider Drive, Stoughton, WI 53589 (United States); [Sincrotrone Trieste, Padriciano 99, 34012, Trieste (Italy); [Lawrence Berkeley Laboratory, Center for X ray Optics, 1 Cyclotron Road, 80-101, Berkeley, CA 94720 (United States); [Institut de Physique Appliqee, Ecole Polytechnique Federale, CH-1015, Lausanne (Switzerland)

1996-09-01T23:59:59.000Z

193

Development and comparison of algorithms for generating a scan sequence for a random access scanner. [ZAP (and flow charts for ZIP and SCAN), in FORTRAN for DEC-10  

SciTech Connect

Many data acquisition systems incorporate high-speed scanners to convert analog signals into digital format for further processing. Some systems multiplex many channels into a single scanner. A random access scanner whose scan sequence is specified by a table in random access memory will permit different scan rates on different channels. Generation of this scan table can be a tedious manual task when there are many channels (e.g. 50), when there are more than a few scan rates (e.g. 5), and/or when the ratio of the highest scan rate to the lowest scan rate becomes large (e.g. 100:1). An algorithm is developed which will generate these scan sequences for the random access scanner and implements the algorithm on a digital computer. Application of number theory to the mathematical statement of the problem led to development of several algorithms which were implemented in FORTRAN. The most efficient of these algorithms operates by partitioning the problem into a set of subproblems. Through recursion they solve each subproblem by partitioning it repeatedly into even smaller parts, continuing until a set of simple problems is created. From this process, a pictorial representation or wheel diagram of the problem can be constructed. From the wheel diagram and a description of the original problem, a scan table can be constructed. In addition, the wheel diagram can be used as a method of storing the scan sequence in a smaller amount of memory. The most efficient partitioning algorithm solved most scan table problems in less than a second of CPU time. Some types of problems, however, required as much as a few minutes of CPU time. 26 figures, 2 tables.

Eason, R. O.

1980-09-01T23:59:59.000Z

194

A simplistic view of hadron calorimetry  

E-Print Network (OSTI)

the signals at a given muon energy, calculates the average,of Energy Losses of Ultrarelativistic Muons, (in Russian),the result for high-energy muons must also be corrected for

Groom, Donald E.

2006-01-01T23:59:59.000Z

195

CONTROLLED ATMOSPHERE BENCH-SCALE CALORIMETRY REVISITED  

E-Print Network (OSTI)

effective heat of combustion, thé mass loss rate, thé time to ignition12 . The standard Cône Calorimeter has

Paris-Sud XI, Université de

196

Cone Calorimetry Mark McKinnon  

E-Print Network (OSTI)

1 ln The effective heat of combustion is calculated based on the summation of the heat release rate of smoke Properties/Parameters Determined from Data: Heat release rate, Burning rate, Effective heat of combustion, Thermal response parameter, Yields of combustion byproducts. 6/25/2014Presentation

Shapiro, Benjamin

197

Expressing precision and bias in calorimetry  

SciTech Connect

The calibration and calibration verification of a nuclear calorimeter represents a substantial investment of time in part because a single calorimeter measurement takes of the order of 2 to 24h to complete. The time to complete a measurement generally increases with the size of the calorimeter measurement well. It is therefore important to plan the sequence of measurements rather carefully so as to cover the dynamic range and achieve the required accuracy within a reasonable time frame. This work will discuss how calibrations and their verification has been done in the past and what we consider to be good general practice in this regard. A proposed approach to calibration and calibration verification is presented which, in the final analysis, makes use of all the available data - both calibration and verification collectively - in order to obtain the best (in a best fit sense) possible calibration. The combination of sample variance and percent recovery are traditionally taken as sufficient to capture the random (precision) and systematic (bias) contributions to the uncertainty in a calorimetric assay. These terms have been defined as well as formulated for a basic calibration. It has been tradition to assume that sensitivity is a linear function of power. However, the availability of computer power and statistical packages should be utilized to fit the response function as accurately as possible using whatever functions are deemed most suitable. Allowing for more flexibility in the response function fit will enable the calibration to be updated according to the results from regular validation measurements through the year. In a companion paper to be published elsewhere we plan to discuss alternative fitting functions.

Hauck, Danielle K [Los Alamos National Laboratory; Croft, Stephen [Los Alamos National Laboratory; Bracken, David S [Los Alamos National Laboratory

2010-01-01T23:59:59.000Z

198

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

199

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

200

DIFFERENTIAL SOIL IMPEDANCE OBSTACLE DETECTION  

SciTech Connect

This project develops a new and unique obstacle detection sensor for horizontal directional drilling (HDD) equipment. The development of this new technology will greatly improve the reliability and safety of natural gas HDD construction practices. This sensor utilizes a differential soil impedance measurement technique that will be sensitive to the presence of plastic and ceramic, as well as metallic obstacles. The use of HDD equipment has risen significantly in the gas industry because HDD provides a much more cost-effective and less disruptive method for gas pipe installation than older, trenching methods. However, there have been isolated strikes of underground utilities by HDD equipment, which may have been avoided if methods were available to detect other underground obstacles when using HDD systems. GTI advisors from the gas industry have ranked the value of solving the obstacle detection problem as the most important research and development project for GTI to pursue using Federal Energy Regulatory Commission (FERC) funds available through its industry partner, GRI. GTI proposes to develop a prototype down-hole sensor system that is simple and compact. The sensor utilizes an impedance measurement technique that is sensitive to the presence of metallic or nonmetallic objects in the proximity of the HDD head. The system will use a thin film sensor conformal with the drill head. The impedance of the soil will be measured with a low frequency signal injected through the drill head itself. A pair of bridge type impedance sensors, mounted orthogonal to one another, is capacitively coupled to the soil. Inclusions in the soil will cause changes to the sensor balance distinguishable from homogeneous soil. The sensor will provide range and direction data for obstacles near the HDD head. The goal is to provide a simple, robust system that provides the information required to avoid obstacles. This must be done within the size and ruggedness constraints of the HDD equipment. Imaging obstacles is not within the scope of this work, as it would require a more elaborate sensor than is practical within the HDD head.

Maximillian J. Kieba

2002-08-30T23:59:59.000Z

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.
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201

18.03 Differential Equations, Spring 2004  

E-Print Network (OSTI)

Study of ordinary differential equations, including modeling of physical problems and interpretation of their solutions. Standard solution methods for single first-order equations, including graphical and numerical methods. ...

Miller, Haynes R., 1948-

202

OPM Reservist Differential Briefing | Department of Energy  

Office of Environmental Management (EM)

OPM Reservist Differential Briefing Responsible Contacts Bruce Murray HR Policy Advisor E-mail bruce.murray@hq.doe.gov Phone 202-586-3372 More Documents & Publications OPM...

203

A single power supply optoelectronic differential amplifier  

E-Print Network (OSTI)

A SINGLE POWER SUPPLY OPTOELECTRONIC DIFFERENTIAL AMPLIFIER A Thesis by YOUNGiXIIN ALBERT CHOI Submitted to the Graduate College of Texas A&M University in partial fulfillment of the requirement for the degree of MASTER OF SCIENCE December... 1987 Major Subject: Electrical Engineering A SINGLE POWER SUPPLY OPTOELECTRONIC DIFFERENTIAL AMPLIFIER A Thesis by YOUNGMIN ALBERT CHOI Approved a. s to style and content by: He y F. aylor (Chairman of Committee) Kai Chang (Member) Ohannes...

Choi, Youngmin Albert

1987-01-01T23:59:59.000Z

204

A Mobile Automated Tomographic Gamma Scanning System - 13231  

SciTech Connect

Canberra Industries have recently designed and built a new automated Tomographic Gamma Scanning (TGS) system for mobile deployment. The TGS technique combines high-resolution gamma spectroscopy with low spatial resolution 3-dimensional image reconstruction to provide increased accuracy over traditional approaches for the assay of non-uniform source distributions in low-to medium-density, non-heterogeneous matrices. Originally pioneered by R. Estep at Los Alamos National Laboratory (LANL), the TGS method has been further developed and commercialized by Canberra Industries in recent years. The present system advances the state of the art on several fronts: it is designed to be housed in a standard cargo transport container for ease of transport, allowing waste characterization at multiple facilities under the purview of a single operator. Conveyor feed, drum rotator, and detector and collimator positioning mechanisms operated by programmable logic control (PLC) allow automated batch mode operation. The variable geometry settings can accommodate a wide range of waste packaging, including but not limited to standard 220 liter drums, 380 liter overpack drums, and smaller 20 liter cans. A 20 mCi Eu-152 transmission source provides attenuation corrections for drum matrices up to 1 g/cm{sup 3} in TGS mode; the system can be operated in Segmented Gamma Scanning (SGS) mode to measure higher density drums. To support TGS assays at higher densities, the source shield is sufficient to house an alternate Co-60 transmission source of higher activity, up to 250 mCi. An automated shutter and attenuator assembly is provided for operating the system with a dual intensity transmission source. The system's 1500 kg capacity rotator turntable can handle heavy containers such as concrete lined 380 liter overpack drums. Finally, data acquisition utilizes Canberra's Broad Energy Germanium (BEGE) detector and Lynx MCA, with 32 k channels, providing better than 0.1 keV/channel resolution to support both isotopic analysis with the MGA/MGAU software and a wide 3 MeV dynamic range. The calibration and verification of the system is discussed, and quantitative results are presented for a variety of drum types and matrices. (authors)

Kirkpatrick, J.M.; LeBlanc, P.J.; Nakazawa, D.; Petroka, D.L.; Kane Smith, S.; Venkataraman, R.; Villani, M. [Canberra Industries, Inc. 800 Research Parkway, Meriden CT 06450 (United States)] [Canberra Industries, Inc. 800 Research Parkway, Meriden CT 06450 (United States)

2013-07-01T23:59:59.000Z

205

Accelerated High-Resolution Differential Ion Mobility Separations...  

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

High-Resolution Differential Ion Mobility Separations Using Hydrogen. Accelerated High-Resolution Differential Ion Mobility Separations Using Hydrogen. Abstract: The resolving...

206

A Hybrid Approach to Protein Differential Expression in Mass...  

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

Hybrid Approach to Protein Differential Expression in Mass Spectrometry-Based Proteomics. A Hybrid Approach to Protein Differential Expression in Mass Spectrometry-Based...

207

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

208

Band excitation method applicable to scanning probe microscopy  

DOE Patents (OSTI)

Methods and apparatus are described for scanning probe microscopy. A method includes generating a band excitation (BE) signal having finite and predefined amplitude and phase spectrum in at least a first predefined frequency band; exciting a probe using the band excitation signal; obtaining data by measuring a response of the probe in at least a second predefined frequency band; and extracting at least one relevant dynamic parameter of the response of the probe in a predefined range including analyzing the obtained data. The BE signal can be synthesized prior to imaging (static band excitation), or adjusted at each pixel or spectroscopy step to accommodate changes in sample properties (adaptive band excitation). An apparatus includes a band excitation signal generator; a probe coupled to the band excitation signal generator; a detector coupled to the probe; and a relevant dynamic parameter extractor component coupled to the detector, the relevant dynamic parameter extractor including a processor that performs a mathematical transform selected from the group consisting of an integral transform and a discrete transform.

Jesse, Stephen; Kalinin, Sergei V

2013-05-28T23:59:59.000Z

209

Laboratory evaluation of the IriScan prototype biometric identifier  

SciTech Connect

One thing that all access control applications have in common is the need to identify those individuals authorized to gain access to an area. Traditionally, the identification is based on something that person possesses, such as a key or badge, or something they know, such as a PIN or password. Biometric identifiers make their decisions based on the physiological or behavioral characteristics of individuals. The potential of biometrics devices to positively identify individuals has made them attractive for use in access control and computer security applications. However, no systems perform perfectly, so it is important to understand what a biometric device`s performance is under real world conditions before deciding to implement one in an access control system. This paper will describe the evaluation of a prototype biometric identifier provided by IriScan Incorporated. This identifier was developed to recognize individual human beings based on the distinctive visual characteristics of the irises of their eyes. The main goal of the evaluation was to determine whether the system has potential as an access control device within the Department of Energy (DOE). The primary interest was an estimate of the accuracy of the system in terms of false accept and false reject rates. Data was also collected to estimate throughput time and user acceptability. The performance of the system during the test will be discussed. Lessons learned during the test which may aid in further testing and simplify implementation of a production system will also be discussed.

Bouchier, F.; Ahrens, J.S.; Wells, G.

1996-04-01T23:59:59.000Z

210

Solar collector systems analysis using infrared scanning techniques  

SciTech Connect

Solar energy collector systems analysis using thermography is discussed. The research at the Solar Energy Research Institute (SERI) in this area has focused on infrared (IR) scanning techniques and equipment to determine temperature distributions, flow patterns, and air blockages in solar collectors. The results of this extensive study, covering many sites and types of collectors, illustrate the capabilities of IR analysis as an analysis tool and operation and maintenance procedure when applied to large arrays. Infrared analysis of most collector systems showed temperature distributions that indicated balanced flow patterns with both the thermographs and the hand-held unit. In three significant cases, blocked or broken collector arrays, which previously had gone undetected, were discovered. Using this analysis, validation studies of large computer codes could examine collector arrays for flow patterns or blockages that could cause disagreement between actual and predicted performance. Initial operation and balancing of large systems could be accomplished without complicated sensor systems not needed for normal operations. Maintenance personnel could quickly check their systems without climbing onto the roof and without complicated sensor systems.

Eden, A.

1980-08-01T23:59:59.000Z

211

Microwave beam steerers for electronically scanned reflectometers (abstract)  

SciTech Connect

One of the problems encountered in the application of reflectometry to fusion plasmas is that the transmit antenna must be aligned such that the reflected wave form is successfully collected by a suitably arranged receive antenna. This task is made even more difficult in the case of shaped plasmas, or when plasma motion is such that the incident wave is no longer normal to the plasma surface. One would ideally like to have antennas which may be steered in real time to compensate for changes in plasma shape and/or position. A program has been initiated at U.C. Davis to address this problem, and microwave beam steerers suitable for electronically scanned reflectometers have been developed. The approach taken has been to develop phased antenna array (PAA) concepts which operate over broad bandwidths. Laboratory test results of a proof-of-principle PAA system will be presented, along with a description of ongoing research activities by U.C. Davis in this field. {copyright} {ital 1999 American Institute of Physics.}

Hsia, R.P.; Zhang, W.; Jiang, F.; Domier, C.W.; Luhmann, N.C. Jr. [University of California, Davis, Davis, California 95616 (United States)] [University of California, Davis, Davis, California 95616 (United States)

1999-01-01T23:59:59.000Z

212

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

213

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

214

Calibrated nanoscale dopant profiling using a scanning microwave microscope  

SciTech Connect

The scanning microwave microscope is used for calibrated capacitance spectroscopy and spatially resolved dopant profiling measurements. It consists of an atomic force microscope combined with a vector network analyzer operating between 1-20 GHz. On silicon semiconductor calibration samples with doping concentrations ranging from 10{sup 15} to 10{sup 20} atoms/cm{sup 3}, calibrated capacitance-voltage curves as well as derivative dC/dV curves were acquired. The change of the capacitance and the dC/dV signal is directly related to the dopant concentration allowing for quantitative dopant profiling. The method was tested on various samples with known dopant concentration and the resolution of dopant profiling determined to 20% while the absolute accuracy is within an order of magnitude. Using a modeling approach the dopant profiling calibration curves were analyzed with respect to varying tip diameter and oxide thickness allowing for improvements of the calibration accuracy. Bipolar samples were investigated and nano-scale defect structures and p-n junction interfaces imaged showing potential applications for the study of semiconductor device performance and failure analysis.

Huber, H. P.; Hochleitner, M.; Hinterdorfer, P. [University of Linz, Christian Doppler Laboratory for Nanoscopic Methods in Biophysics, Altenbergerstrasse 69, 4040 Linz (Austria); Humer, I.; Smoliner, J. [Technical University of Vienna, Institute for Solid State Electronics, 1040 Vienna (Austria); Fenner, M.; Moertelmaier, M.; Rankl, C.; Tanbakuchi, H.; Kienberger, F. [Agilent Technologies, Inc., 5301 Stevens Creek Blvd., Santa Clara, California 95051 (United States); Imtiaz, A.; Wallis, T. M.; Kabos, P. [National Institute for Standards and Technology, Electromagnetic Division, 325 Broadway, Boulder, Colorado 80305-3337 (United States); Kopanski, J. J. [National Institute of Standards and Technology, Semiconductor Measurements Division, Gaithersburg, Maryland 20899-8120 (United States)

2012-01-01T23:59:59.000Z

215

E-Print Network 3.0 - automatic scanning system Sample Search...  

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

Engineering 18 Performance Evaluation 63 (2006) 700723 On the performance of Internet worm scanning strategies Summary: address in a time interval , q Z(t) number of...

216

E-Print Network 3.0 - association scan reveals Sample Search...  

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

changed?" The remainder... into clusters, which are then grouped by target destination ports. This final comparison reveals scanning... are then grouped by target destination...

217

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

SciTech Connect

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

218

E-Print Network 3.0 - acoustic wave-assisted scanning Sample...  

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

Key words: frequency-dependent backscatter... sonographic scanning system are made from radio frequency (RF) echo signals. The RF echo signals are ... Source: Illinois at...

219

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.

220

A compact scanning soft X-ray microscope  

SciTech Connect

Soft x-ray microscopes operating at wavelengths between 2.3 nm and 4.4 nm are capable of imaging wet biological cells with a resolution many times that of a visible light microscope. Several such soft x-ray microscopes have been constructed. However, with the exception of contact microscopes, all use synchrotrons as the source of soft x-ray radiation and Fresnel zone plates as the focusing optics. These synchrotron based microscopes are very successful but have the disadvantage of limited access. This dissertation reviews the construction and performance of a compact scanning soft x-ray microscope whose size and accessibility is comparable to that of an electron microscope. The microscope uses a high-brightness laser-produced plasma as the soft x-ray source and normal incidence multilayer-coated mirrors in a Schwarzschild configuration as the focusing optics. The microscope operates at a wavelength of 14 nm, has a spatial resolution of 0.5 {mu}m, and has a soft x-ray photon flux through the focus of 10{sup 4}-10{sup 5} s{sup {minus}1} when operated with only 170 mW of average laser power. The complete system, including the laser, fits on a single 4{prime} x 8{prime} optical table. The significant components of the compact microscope are the laser-produced plasma (LPP) source, the multilayer coatings, and the Schwarzschild objective. These components are reviewed, both with regard to their particular use in the current microscope and with regard to extending the microscope performance to higher resolution, higher speed, and operation at shorter wavelengths. Measurements of soft x-ray emission and debris emission from our present LPP source are presented and considerations given for an optimal LPP source. The LPP source was also used as a broadband soft x-ray source for measurement of normal incidence multilayer mirror reflectance in the 10-25 nm spectral region.

Trail, J.A.

1989-01-01T23:59:59.000Z

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.


221

Results of mobile gamma scanning activities in St. Louis, Missouri  

SciTech Connect

From 1942 through approximately 1966, the Mallinckrodt Chemical Works operated four plants in St. Louis, Missouri, for the Manhattan Engineer District and the Atomic Energy Commission. A variety of production processes using uranium- and radium-bearing ore materials were performed at the plants. It is the policy of the DOE to verify that radiological conditions at such sites or facilities comply with current DOE guidelines. Guidelines for release and use of such sites have become more stringent as research has provided more information since previous cleanups. The Formerly Utilized Sites Remedial Action Program (FUSRAP) was established as part of that effort to confirm the closeout status of facilities under contract to agencies preceding DOE during early nuclear energy development. Under the FUSRAP program, the Mallinckrodt properties have been previously investigated to determine the extent of on-site radiological contamination. At the request of DOE, Oak Ridge National Laboratory (ORNL) conducted a survey in May 1990, of public roadways and suspected haul routes between the Mallinckrodt plant and storage sites in St. Louis to ensure that no residual radioactive materials were conveyed off-site. A mobile gamma scanning van with an on-board computer system was used to identify possible anomalies. Suspect areas are those displaying measurements deviating from gamma exposure rates identified as typical for radiologically unenhanced areas in the vicinity of the areas of interest. The instrumentation highlighted three anomaly locations each of which measured less than 1m{sup 2} in size. None of the slightly elevated radiation levels originated from material associated with former AEC-related processing operations in the area. The anomalies resulted from elevated concentrations of radionuclides present in phosphate fertilizers, increased thorium in road-base gravel, and emanations from the radioactive storage site near the Latty Avenue airport. 9 refs., 3 figs.

Rodriguez, R E; Witt, D A; Cottrell, W D; Carrier, R F

1991-06-01T23:59:59.000Z

222

Differential rotation of nonlinear r-modes  

Science Journals Connector (OSTI)

The differential rotation of r-modes is investigated within the nonlinear theory up to second order in the mode amplitude in the case of a slowly rotating, Newtonian, barotropic, perfect-fluid star. We find a nonlinear extension of the linear r-mode, which represents differential rotation that produces large scale drifts of fluid elements along stellar latitudes. This solution includes a piece induced by first-order quantities and another one that is a pure second-order effect. Since the latter is stratified on cylinders, it cannot cancel differential rotation induced by first-order quantities, which is not stratified on cylinders. It is shown that, unlike the situation in the linearized theory, r-modes do not preserve the vorticity of fluid elements at second order. It is also shown that the physical angular momentum and energy of the perturbation are, in general, different from the corresponding canonical quantities.

Paulo M. Sá

2004-04-02T23:59:59.000Z

223

On obliquely magnetized and differentially rotating stars  

E-Print Network (OSTI)

We investigate the interaction of differential rotation and a misaligned magnetic field. The incompressible magnetohydrodynamic equations are solved numerically for a free-decay problem. In the kinematic limit, differential rotation annihilates the non-axisymmetric field on a timescale proportional to the cube root of magnetic Reynolds number ($Rm$), as predicted by R\\"adler. Nonlinearly, the outcome depends upon the initial energy in the non-axisymmetric part of the field. Sufficiently weak fields approach axisymmetry as in the kinematic limit; some differential rotation survives across magnetic surfaces, at least on intermediate timescales. Stronger fields enforce uniform rotation and remain non-axisymmetric. The initial field strength that divides these two regimes does not follow the scaling $Rm^{-1/3}$ predicted by quasi-kinematic arguments, perhaps because our $Rm$ is never sufficiently large or because of reconnection. We discuss the possible relevance of these results to tidal synchronization and tida...

Wei, Xing

2015-01-01T23:59:59.000Z

224

Laser-Scanning Coherent Anti-Stokes Raman Scattering Microscopy and Applications to Cell Biology  

E-Print Network (OSTI)

Laser-Scanning Coherent Anti-Stokes Raman Scattering Microscopy and Applications to Cell Biology Ji 11747-3157 USA ABSTRACT Laser-scanning coherent anti-Stokes Raman scattering (CARS) microscopy with fast., 1990). Duncan et al. constructed the first CARS microscope by use of two dye laser beams

Xie, Xiaoliang Sunney

225

CNT4704: Analysis of Computer Communication Networks (Fall 2014) Programming Assignment 3: Port Scanning Tool  

E-Print Network (OSTI)

CNT4704: Analysis of Computer Communication Networks (Fall 2014) Programming Assignment 3: Port will reinforce your socket programming knowledge and skill to generate a small but useful port scanning tool, which can scan a remote machine for a range of TCP ports in order to find which TCP services have been

Zou, Cliff C.

226

Scanning photo-induced impedance microscopy*/an impedance based imaging technique  

E-Print Network (OSTI)

Scanning photo-induced impedance microscopy*/an impedance based imaging technique Steffi Krause a technique, scanning photo-induced impedance micro- scopy (SPIM), suitable for the imaging of the complex Photoelectrochemistry has been used widely to study photo-thermally induced current changes at metal surfaces

Moritz, Werner

227

Automatic Reconstruction of Surfaces and Scalar Fields from 3D Scans1 2  

E-Print Network (OSTI)

dimensional (3D) points scan of its surface. Color, texture or some scalar material property of the physical) of a three-dimensional Delaunay Triangulation, its dual the three-dimensional Voronoi diagram, and dual uses with a more complex geometry, e.g. objects with holes, handles, pockets, cannot be scanned in a single pass

Xu, Guo-liang

228

Video-Rate Scanning Two-Photon Excitation Fluorescence Microscopy and Ratio Imaging with Cameleons  

E-Print Network (OSTI)

Video-Rate Scanning Two-Photon Excitation Fluorescence Microscopy and Ratio Imaging with Cameleons ABSTRACT A video-rate (30 frames/s) scanning two-photon excitation microscope has been successfully tested 690 to 1050 nm, prechirper optics for laser pulse-width compression, resonant galvanometer for video

Tsien, Roger Y.

229

Spectroscopic imaging from spatially-encoded single-scan multidimensional MRI data  

E-Print Network (OSTI)

Spectroscopic imaging from spatially-encoded single-scan multidimensional MRI data Assaf Tal, Lucio multidimensional magnetic resonance images within a single scan, based on a spatial encoding of the spin in its magnitude the spatial distribution of spins throughout the sample. It is hereby shown that whereas

Frydman, Lucio

230

Multi-atlas Segmentation in Head and Neck CT Scans Amelia M. Arbisser  

E-Print Network (OSTI)

Multi-atlas Segmentation in Head and Neck CT Scans by Amelia M. Arbisser B.S., Computer Science of Engineering Thesis Committee #12;2 #12;Multi-atlas Segmentation in Head and Neck CT Scans by Amelia M, we employ an atlas of labeled training images. We register each of these images to the unlabeled

Golland, Polina

231

Automatic Scan Prescription for Brain MRI T. Ernst, L. Itti, L. Chang  

E-Print Network (OSTI)

Automatic Scan Prescription for Brain MRI T. Ernst, L. Itti, L. Chang Harbor-UCLA Medical Center that allows the automatic prescription of brain MRI scans. This involves determination of the orientation of the current patient's brain, by matching his/her brain surface with a template brain surface. A desired

Itti, Laurent

232

ACQUISITION AND RECONSTRUCTION OF BRAIN TISSUE USING KNIFE-EDGE SCANNING MICROSCOPY  

E-Print Network (OSTI)

ACQUISITION AND RECONSTRUCTION OF BRAIN TISSUE USING KNIFE- EDGE SCANNING MICROSCOPY A Thesis Science #12;ACQUISITION AND RECONSTRUCTION OF BRAIN TISSUE USING KNIFE- EDGE SCANNING MICROSCOPY A Thesis) ______________________________ ______________________________ Ergun Akleman Valerie Taylor (Member) (Head of Department) December 2003 Major Subject: Computer Science

Keyser, John

233

Incorporating Multiple cDNA Microarray Slide Scans -Application to Somatic Embryogenesis in Maize  

E-Print Network (OSTI)

Incorporating Multiple cDNA Microarray Slide Scans -Application to Somatic Embryogenesis in Maize 1 the measurements of gene expression. Because `optimal' settings may vary from slide to slide, operators typically scan each slide multiple times and then choose the reading with the fewest over-exposed and under

234

Fast Image Drift Compensation in Scanning Electron Microscope Using Image Registration  

E-Print Network (OSTI)

Fast Image Drift Compensation in Scanning Electron Microscope Using Image Registration Naresh Marturi, Sounkalo Demb´el´e and Nadine Piat Abstract-- Scanning Electron Microscope (SEM) image ac analysis and characterization of materials to recover their structural, mechanical, electrical and optical

Boyer, Edmond

235

Experimental Investigation of the Effect of Speckle Noise on Continuous Scan Laser Doppler Vibrometer Measurements  

E-Print Network (OSTI)

Period i : Phase Variable v : Voltage Signal fsamp : Sampling Frequency y : Response Signal fscan Research Building 1500 Engineering Drive Madison, WI 53706 Abstract Continuous Scan Laser Doppler when the scan frequency is high relative to the highest natural frequency of interest, and state

Allen, Matthew S.

236

Oxygen driven reconstruction dynamics of Ni,,977... measured by time-lapse scanning tunneling microscopy  

E-Print Network (OSTI)

Oxygen driven reconstruction dynamics of Ni,,977... measured by time-lapse scanning tunneling-lapse scanning tunneling microscopy STM has been used to observe the oxygen induced reconstruction behavior of Ni for the merging of steps in the presence of small amounts of adsorbed oxygen, less than 2% of a monolayer. Point

Sibener, Steven

237

Locating the Eyes in CT Brain Scan Data Kostis Kaggelides, Peter J. Elliott  

E-Print Network (OSTI)

, a technique for locating the eyes in Computed Tomography brain scan data, is described. The objective and implemented an algorithm which automaticallyidenti es and locates the eyes in a Computed Tomography(CT) brainLocating the Eyes in CT Brain Scan Data Kostis Kaggelides, Peter J. Elliott IBM UK Scienti c Centre

Fisher, Bob

238

Characterization and stabilization of fully differential circuits  

E-Print Network (OSTI)

. 15. Two integrator loop structure with "wire implementation" of the gain stage, split into common mode and differential paths we can practically match . 4is to . 4i4 to ?. 4iq to ?. 4rs. EVhence, we obtain ADD - 2. 4is (3. 12) . 413 . 414 + . 423...(s) X3 X4 Fig. 1. Basic linear system block 1 XDm Xcin Xl + Z + X~ G(si X4 Fig. 2. Basic system block excited with common mode and differential mode signals Xl Q(s) X3 +~ + 1 Xc, ?, XD, ?, Fig. 3. Conversion of standard outputs to common...

Seaberg, Charles Eric

1991-01-01T23:59:59.000Z

239

Passive millimeter wave differential interference contrast polarimetry  

DOE Patents (OSTI)

Differential polarization imaging systems include an axicon configured to provide a displacement of ray bundles associated with different image patches. The displaced ray bundles are directed to antenna horns and orthomode transducers so as to provide outputs correspond to orthogonal linear states of polarization (SOPs). The outputs are directed to a differential radiometer so that Stokes parameter differences between image patches can be obtained. The ray bundle displacements can be selected to correspond to a mechanical spacing of antenna horns. In some examples, ray bundle displacement corresponds to a displacement less than the diffraction limit.

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

2014-04-29T23:59:59.000Z

240

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)

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

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

242

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)

243

Design of a scanning Josephson junction microscope for submicron-resolution magnetic imaging  

SciTech Connect

We describe a magnetic field scanning instrument designed to extend the spatial resolution of scanning superconducting quantum interference device microscopy into the submicron regime. This instrument, the scanning Josephson junction microscope, scans a single Josephson junction across the surface of a sample, detecting the local magnetic field by the modulation of the junction critical current. By using a submicron junction and a scanning tunneling microscope feedback system to maintain close proximity to the surface, magnetic field sensitivity of 10 {mu}G with a spatial resolution of 0.3 {mu}m should be attainable, opening up new opportunities for imaging vortex configurations and core structure in superconductors and magnetic domains in magnetic materials. {copyright} {ital 1999 American Institute of Physics.}

Plourde, B.L.; Van Harlingen, D.J. [Department of Physics, Science and Technology Center for Superconductivity, and Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801 (United States)] [Department of Physics, Science and Technology Center for Superconductivity, and Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801 (United States)

1999-11-01T23:59:59.000Z

244

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

245

Amorphous and crystalline phase formation in Ni/Al multilayer thin films  

SciTech Connect

The authors have investigated reactive phase formation in magnetron sputter-deposited Ni/Al multilayer films with a 1:3 molar ratio and various periodicities ranging from 320 nm to a codeposited film with an effective periodicity of zero. The films were studied by x-ray diffraction, differential scanning calorimetry, electrical resistance measurements, and transmission electron microscopy. The authors find that a reaction which results in the formation of an amorphous phase has taken place during the multilayer deposition process. This reaction substantially reduces the driving force for subsequent reactions and explains why nucleation kinetics become important for these reactions. The mode of transformation for a film with 10 nm periodicity was investigated, in detail, by applying the Johnson-Mehl-Avrami analysis to data obtained from isothermal and constant heating rate differential scanning calorimetry, in combination with electron microscopy studies of the transformation microstructure.

Lucadamo, G.; Barmak, K. [Lehigh Univ., Bethlehem, PA (United States). Dept. of Materials Science and Engineering; Michaelsen, C. [GKSS Research Center, Geesthacht (Germany). Inst. of Materials Research

1996-12-31T23:59:59.000Z

246

Using MATLAB to solve differential equations numerically  

E-Print Network (OSTI)

Using MATLAB to solve differential equations numerically Morten Brøns Department of Mathematics of the programming language MATLAB. We will focus on practical matters and readers interested in numerical analysis as a mathematical subject should look elsewhere. In the G-databar at DTU, MATLAB can be accessed either by typing �

Klein, David

247

Exotic Differentiable Structures and General Relativity  

E-Print Network (OSTI)

We review recent developments in differential topology with special concern for their possible significance to physical theories, especially general relativity. In particular we are concerned here with the discovery of the existence of non-standard (``fake'' or ``exotic'') differentiable structures on topologically simple manifolds such as $S^7$, \\R and $S^3\\times {\\bf R^1}.$ Because of the technical difficulties involved in the smooth case, we begin with an easily understood toy example looking at the role which the choice of complex structures plays in the formulation of two-dimensional vacuum electrostatics. We then briefly review the mathematical formalisms involved with differentiable structures on topological manifolds, diffeomorphisms and their significance for physics. We summarize the important work of Milnor, Freedman, Donaldson, and others in developing exotic differentiable structures on well known topological manifolds. Finally, we discuss some of the geometric implications of these results and propose some conjectures on possible physical implications of these new manifolds which have never before been considered as physical models.

Carl H. Brans; Duane Randall

1992-12-03T23:59:59.000Z

248

Lifetime-based TCP service differentiation  

Science Journals Connector (OSTI)

We present a lifetime-based differentiation framework for TCP flows. The separation into two classes is based on a threshold technique. We introduce a scheme, FairShare, that handles the long-lived flows and achieves global max-min fairness. The short-lived ... Keywords: Active queue management, Bandwidth allocation, Fairness, TCP

I. Nikolaidis; X. Wu

2005-01-01T23:59:59.000Z

249

Trees, rough integration and differential equations  

E-Print Network (OSTI)

on the trajectory (x,y). mg (orsay) trees, rough paths, ... 3 / 27 #12;Trees L finite set. Trees labeled by L , TLTrees, rough integration and differential equations Massimiliano Gubinelli Laboratoire de Mathématiques Université Paris-Sud XI mg (orsay) trees, rough paths, ... 1 / 27 #12;Rough paths T. Lyons (Oxford

Gubinelli, Massimiliano

250

Optimization of Differential-Algebraic Equation Systems  

E-Print Network (OSTI)

(reactor, column) nu control profiles for optimal operation Constraints: uL u(t) uU zL z(t) z optimal reactor temperature policy optimal column reflux ratio Batch Process Optimization zi,I 0 zi,II 01 Optimization of Differential- Algebraic Equation Systems L. T. Biegler Chemical Engineering

Grossmann, Ignacio E.

251

Quantum Field Theory and Differential Geometry  

E-Print Network (OSTI)

We introduce the historical development and physical idea behind topological Yang-Mills theory and explain how a physical framework describing subatomic physics can be used as a tool to study differential geometry. Further, we emphasize that this phenomenon demonstrates that the interrelation between physics and mathematics have come into a new stage.

W. F. Chen

2008-03-10T23:59:59.000Z

252

Tunneling spectroscopy study of YBa2Cu3O7 thin films using a cryogenic scanning tunneling microscope  

Science Journals Connector (OSTI)

We have measured reproducible tunneling spectra on YBa2Cu3O7 (Tc?85 K) thin films (thickness ?2 ?m) with a cryogenic scanning tunneling microscope. We find that the I-V curves are generally of three types. The most common type, featured in a large majority of the data, shows a region of high conductance at zero bias. The amplitude of this region is inversely proportional to the tunneling resistance between the tip and sample. It is possible that this can be explained in terms of Josephson effects within the films, although an alternative is given based on electronic self-energy corrections. Data showing capacitive charging steps are analyzed in terms of two ultrasmall tunnel junctions in series.. Theoretical fits to the data give specific values of the junction parameters that are consistent with the assumed geometry of the tip probing an individual grain of the film. The third type of I-V curves exhibits negative differential resistance. We conclude that this phenomenon is probably due to tunneling to localized states in the surface oxide. We also present and discuss data with energy-gap-like behavior; the best example gives ? to be about 27 mV.

R. Wilkins, M. Amman, R. E. Soltis, E. Ben-Jacob, and R. C. Jaklevic

1990-05-01T23:59:59.000Z

253

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.

254

A comparative study of proliferation and osteogenic differentiation of adipose-derived stem cells on akermanite and ?-TCP ceramics  

Science Journals Connector (OSTI)

This study investigated the in vitro effects of akermanite, a new kind of Ca-, Mg-, Si-containing bioceramic, on the attachment, proliferation and osteogenic differentiation of human adipose-derived stem cells (hASCs). Parallel comparison of the cellular behaviors of hASCs on the akermanite was made with those on beta-tricalcium phosphate (?-TCP). Scanning electron microscope (SEM) observation and fluorescent DiO labeling were carried out to reveal the attachment and growth of hASCs on the two ceramic surfaces, while the quantitative assay of cell proliferation with time was detected by DNA assay. Osteogenic differentiation of hASCs cultured on the akermanite and ?-TCP was assayed by ALP expression and osteocalcin (OCN) deposition, which was further confirmed by Real-time PCR analysis for markers of osteogenic differentiation. It was shown that hASCs attached and spread well on the akermanite as those on ?-TCP, and similar proliferation behaviors of hASCs were observed on the two ceramics. Both of them exhibited good compatibility to hASCs with only minor cytotoxicity as compared with the tissue culture plates. Interestingly, the osteogenic differentiation of hASCs could be enhanced on the akermanite compared with that on the ?-TCP when the culture time was extended to ?10 days. Thus, it can be ascertained that akermanite ceramics may serve as a potential scaffold for bone tissue engineering.

Qihai Liu; Lian Cen; Shuo Yin; Lei Chen; Guangpeng Liu; Jiang Chang; Lei Cui

2008-01-01T23:59:59.000Z

255

Process for rapid detection of fratricidal defects on optics using Linescan Phase Differential Imaging  

SciTech Connect

Phase-defects on optics used in high-power lasers can cause light intensification leading to laser-induced damage of downstream optics. We introduce Linescan Phase Differential Imaging (LPDI), a large-area dark-field imaging technique able to identify phase-defects in the bulk or surface of large-aperture optics with a 67 second scan-time. Potential phase-defects in the LPDI images are indentified by an image analysis code and measured with a Phase Shifting Diffraction Interferometer (PSDI). The PSDI data is used to calculate the defects potential for downstream damage using an empirical laser-damage model that incorporates a laser propagation code. A ray tracing model of LPDI was developed to enhance our understanding of its phase-defect detection mechanism and reveal limitations.

Ravizza, F L; Nostrand, M C; Kegelmeyer, L M; Hawley, R A; Johnson, M A

2009-11-05T23:59:59.000Z

256

Influence of Ionic Surfactants on the Aggregation of Poly(Ethylene Oxide)-Poly(Propylene Oxide)-Poly(Ethylene Oxide) Block Copolymers Studied by Differential Scanning and  

E-Print Network (OSTI)

Influence of Ionic Surfactants on the Aggregation of Poly(Ethylene Oxide)-Poly(Propylene Oxide)-Poly(Ethylene copolymers of poly(ethylene oxide) and poly(propylene oxide), EOnPOmEOn, and the ionic surfactants sodium the aggregates of all three polymers. Introduction Water-soluble poly(ethylene oxide)-poly(propylene oxide)- poly(ethylene

Loh, Watson

257

Preparation of TiO2(110)-(1x1) Surface via UHV Cleavage: An scanning...  

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

Preparation of TiO2(110)-(1x1) Surface via UHV Cleavage: An scanning tunneling microscopy study. Preparation of TiO2(110)-(1x1) Surface via UHV Cleavage: An scanning tunneling...

258

High Bandwidth Differential Amplifier for Shock Experiments  

SciTech Connect

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

259

High Bandwidth Differential Amplifier for Shock Experiments  

SciTech Connect

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

260

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

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

Low-Dose Spiral CT Scans for Early Lung Cancer Detection  

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

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).

262

Rank-1 accelerated illumination recovery in scanning diffractive imaging by transparency estimation.  

SciTech Connect

Illumination retrieval in scanning diffractive imaging a.k.a. ptychography is challenging when the specimen is weakly scattering or surrounded by empty space. We describe a rank-1 acceleration method for weakly scattering or piecewise smooth specimens.

Wu, Hau-Tieng

2014-08-07T23:59:59.000Z

263

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

E-Print Network (OSTI)

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

264

Combining In-Situ Buffer-Layer-Assisted-Growth with Scanning...  

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

growth (BLAG) technique by combining EMSL's ultra-high vacuum scanning probe microscopy (UHV SPM) and applying the resulting novel tool for formation and structural study of BaO...

265

Environmental Scanning and Knowledge Representation for the Detection of Organised Crime Threats  

Science Journals Connector (OSTI)

...ePOOLICE aims at developing an efficient and effective strategic early warning system that utilises environmental scanning for the early warning and detection of current, emergent and future organised crime threats

Ben Brewster; Simon Andrews; Simon Polovina…

2014-01-01T23:59:59.000Z

266

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

267

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

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

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...

268

12 IEEE TRANSACTIONS ON NANOTECHNOLOGY, VOL. 1, NO. 1, MARCH 2002 Scanning the Controls: Genomics and  

E-Print Network (OSTI)

12 IEEE TRANSACTIONS ON NANOTECHNOLOGY, VOL. 1, NO. 1, MARCH 2002 Scanning the Controls: Genomics and topological complexity is the complexity of the genome itself, consisting of about one billion basepairs. The Human Genome Proj

269

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

270

High-speed noncontact profiler based on scanning white-light interferometry  

Science Journals Connector (OSTI)

We describe a system for fast three-dimensional profilometry, of both optically smooth and optically rough surfaces, based on scanning white-light techniques. The system utilizes an...

Deck, Leslie; de Groot, Peter

1994-01-01T23:59:59.000Z

271

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

272

H-Bridge H-Bridge Relay Differentiator  

E-Print Network (OSTI)

H-Bridge H-Bridge Relay Altera PLD LP Filter LP Filter Differentiator w/LP Filter Differentiator w Supply Voltage Motor H-Bridge Connection Motor Relay Connection FREQ_OUT External Power Supply GP2D12

Wedeward, Kevin

273

H-Bridge H-Bridge Relay Differentiator  

E-Print Network (OSTI)

H-Bridge H-Bridge Relay Altera PLD LP Filter LP Filter Differentiator w/LP Filter Differentiator w In Encoder 0 In Motor Supply Voltage Motor H-Bridge Connection Motor Relay Connection FREQ_OUT Yaskawa DC

Wedeward, Kevin

274

Iterative cellular array multiplier using overlapped four-bit scanning technique and its application  

E-Print Network (OSTI)

ITERATIVE CELLULAR ARRAY MULTIPLIER USING OVERLAPPED FOUR-BIT SCANNING TECHNIQUE AND ITS APPLICATION A Thesis WU WOAN KIM Submitted to the 0%ce of Graduate Studies of Texas ARM University in partial fulfillment of the requirements... for the degree of MASTER OF SCIENCE December 1990 Major Subject: Electrical Engineering ITERATIVE CELLULAR ARRAY MULTIPLIER USING OVERLAPPED FOUR-BIT SCANNING TECHNIQUE AND ITS APPLICATION A Thesis WU WOAN KIM Approved as to style and content by: Karan...

Kim, Wu Woan

2012-06-07T23:59:59.000Z

275

Imaging latch-up sites in CMOS integrated circuits using laser scanning  

E-Print Network (OSTI)

IMAGING LATCH-UP SITES IN CMOS INTEGRATED CIRCUITS USING LASER SCANNING A Thesis JEAN-FRANSOIS FENECH Submitted to the Graduate College of Texas AEM University in partial fulfillment of the requirement for the degree of MASTER OF SCIENCE... December 1985 Major Subject: Electrical Engineering IMAGING LATCH-Up SITES IN CMDS INTEGRATED CIRCUITS USING LASER SCANNING A Thesis by JEAN-FRAN(OIS FENECH Approved as to style and content by: D. L. Parker (Chairman of Committee) N. R. Strader II...

Fenech, Jean-Francois

2012-06-07T23:59:59.000Z

276

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] [Univ. of Manitoba, Winnipeg, Manitoba (Canada). Dept. of Electrical and Computer Engineering

1995-10-01T23:59:59.000Z

277

Pseudo-Differential Operators and Integrable Models  

E-Print Network (OSTI)

The importance of the theory of pseudo-differential operators in the study of non linear integrable systems is point out. Principally, the algebra $\\Xi $ of nonlinear (local and nonlocal) differential operators, acting on the ring of analytic functions $u_{s}(x, t)$, is studied. It is shown in particular that this space splits into several classes of subalgebras $\\Sigma_{jr}, j=0,\\pm 1, r=\\pm 1$ completely specified by the quantum numbers: $s$ and $(p,q)$ describing respectively the conformal weight (or spin) and the lowest and highest degrees. The algebra ${\\huge \\Sigma}_{++}$ (and its dual $\\Sigma_{--}$) of local (pure nonlocal) differential operators is important in the sense that it gives rise to the explicit form of the second hamiltonian structure of the KdV system and that we call also the Gelfand-Dickey Poisson bracket. This is explicitly done in several previous studies, see for the moment \\cite{4, 5, 14}. Some results concerning the KdV and Boussinesq hierarchies are derived explicitly.

M. B. Sedra

2009-12-18T23:59:59.000Z

278

Advertising and consumer search in differentiated markets  

E-Print Network (OSTI)

demand for brand 1 is given as (3.5) [ ]? += ? = ??++ 1 1 11 );,( n r rrrr p DLDLcppD with (3.6) ?? +?+ ?? +?+ ?+ ?+??+?++?? cppx a rnr b cppx r r dFcppFppFdFppFD 1 1 ? 11 1 ? 1 1 )()()()()( ????? (3.7) )()]()(1[)( ? 1 11 ???? dFcppFcFF rn r D cx... only brand search cost. In Chapter II, I present a survey of papers that have examined markets in which agents are imperfectly informed in differentiated markets and focus on the channels of information explicitly examined. I develop a general n...

Harriott, Kevin Kenton

2005-11-01T23:59:59.000Z

279

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

280

System and method for chromatography and electrophoresis using circular optical scanning  

DOE Patents (OSTI)

A system and method is disclosed for chromatography and electrophoresis using circular optical scanning. One or more rectangular microchannel plates or radial microchannel plates has a set of analysis channels for insertion of molecular samples. One or more scanning devices repeatedly pass over the analysis channels in one direction at a predetermined rotational velocity and with a predetermined rotational radius. The rotational radius may be dynamically varied so as to monitor the molecular sample at various positions along a analysis channel. Sample loading robots may also be used to input molecular samples into the analysis channels. Radial microchannel plates are built from a substrate whose analysis channels are disposed at a non-parallel angle with respect to each other. A first step in the method accesses either a rectangular or radial microchannel plate, having a set of analysis channels, and second step passes a scanning device repeatedly in one direction over the analysis channels. As a third step, the scanning device is passed over the analysis channels at dynamically varying distances from a centerpoint of the scanning device. As a fourth step, molecular samples are loaded into the analysis channels with a robot.

Balch, Joseph W. (Livermore, CA); Brewer, Laurence R. (Oakland, CA); Davidson, James C. (Livermore, CA); Kimbrough, Joseph R. (Pleasanton, CA)

2001-01-01T23:59:59.000Z

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.


281

Low differential pressure and multiphase flow measurements by means of differential pressure devices  

E-Print Network (OSTI)

The response of slotted plate, Venturi meter and standard orifice to the presence of two phase, three phase and low differential flows was investigated. Two mixtures (air-water and air-oil) were used in the two-phase analysis while a mixture of air...

Justo, Hernandez Ruiz,

2004-11-15T23:59:59.000Z

282

High-precision absolute distance and vibration measurement with frequency scanned interferometry  

SciTech Connect

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 {approx}50 nm was achieved for absolute distances ranging from 0.1 to 0.7 m by use of the first multiple-distance-measurement technique. The second analysis technique has the capability to measure vibration frequencies ranging from 0.1 to 100 Hz with an amplitude as small as a few nanometers without a priori knowledge.

Yang, H.-J.; Deibel, Jason; Nyberg, Sven; Riles, Keith

2005-07-01T23:59:59.000Z

283

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)

284

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

285

Scanning electrochemical microscope characterization of thin film combinatorial libraries for fuel cell electrode applications  

Science Journals Connector (OSTI)

Pt–Ru combinatorial libraries of potential fuel cell anode catalysts are formed by sequential sputter deposition through masks onto Si wafers. Scanning electrochemical microscopy (SECM) is employed for characterization of electrocatalytic activity. Aspects of using a scanning electrochemical microscope for characterization of an array of thin film fuel cell electrode materials are discussed. It is shown that in applying SECM to library characterization, careful attention must be paid to thin film annealing, specimen topography and tip degradation in order to realize meaningful results. Results from a Pt–Ru thin film library reveal the most active members near the 50 Pt/50 Ru composition.

M Black; J Cooper; P McGinn

2005-01-01T23:59:59.000Z

286

Noise Equivalent Counts Based Emission Image Reconstruction Algorithm of Tomographic Gamma Scanning  

E-Print Network (OSTI)

Tomographic Gamma Scanning (TGS) is a technique used to assay the nuclide distribution and radioactivity in nuclear waste drums. Both transmission and emission scans are performed in TGS and the transmission image is used for the attenuation correction in emission reconstructions. The error of the transmission image, which is not considered by the existing reconstruction algorithms, negatively affects the final results. An emission reconstruction method based on Noise Equivalent Counts (NEC) is presented. Noises from the attenuation image are concentrated to the projection data to apply the NEC Maximum-Likelihood Expectation-Maximization algorithm. Experiments are performed to verify the effectiveness of the proposed method.

Wang, Ke; Feng, Wei; Han, Dong

2014-01-01T23:59:59.000Z

287

Noise Equivalent Counts Based Emission Image Reconstruction Algorithm of Tomographic Gamma Scanning  

E-Print Network (OSTI)

Tomographic Gamma Scanning (TGS) is a technique used to assay the nuclide distribution and radioactivity in nuclear waste drums. Both transmission and emission scans are performed in TGS and the transmission image is used for the attenuation correction in emission reconstructions. The error of the transmission image, which is not considered by the existing reconstruction algorithms, negatively affects the final results. An emission reconstruction method based on Noise Equivalent Counts (NEC) is presented. Noises from the attenuation image are concentrated to the projection data to apply the NEC Maximum-Likelihood Expectation-Maximization algorithm. Experiments are performed to verify the effectiveness of the proposed method.

Ke Wang; Zheng Li; Wei Feng; Dong Han

2014-04-17T23:59:59.000Z

288

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,

289

Sensor for detecting and differentiating chemical analytes  

DOE Patents (OSTI)

A sensor for detecting and differentiating chemical analytes includes a microscale body having a first end and a second end and a surface between the ends for adsorbing a chemical analyte. The surface includes at least one conductive heating track for heating the chemical analyte and also a conductive response track, which is electrically isolated from the heating track, for producing a thermal response signal from the chemical analyte. The heating track is electrically connected with a voltage source and the response track is electrically connected with a signal recorder. The microscale body is restrained at the first end and the second end and is substantially isolated from its surroundings therebetween, thus having a bridge configuration.

Yi, Dechang (Metuchen, NJ); Senesac, Lawrence R. (Knoxville, TN); Thundat, Thomas G. (Knoxville, TN)

2011-07-05T23:59:59.000Z

290

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

291

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

292

Homework scan  

E-Print Network (OSTI)

2.2 A machine dispenses balls that are either red or black or green. Suppose ... 2.4 A large automobile dealership sells three brands of American cars, denoted ...

293

Scanned exercises  

E-Print Network (OSTI)

2.2 A machine dispenses balls that are either red or black or green. Suppose ... 2.4 A large automobile dealership sells three brands of American cars, denoted ...

294

Polynomial solutions of certain differential equations arising in physics  

E-Print Network (OSTI)

Polynomial solutions of certain differential equations arising in physics H. Azad, A. Laradji and M [9], where the authors consider certain equations that arise in mathematical physics

Azad, Hassan

295

Solving Linear Systems of Differential Equations By MATLAB  

E-Print Network (OSTI)

Solving Linear Systems of Differential Equations By MATLAB. Consider X'=AX where A is nxn. Suppose there are n linearly independent eigenvectors for A,.

296

'Magnetoscan': a modified Hall probe scanning technique for the detection of inhomogeneities in bulk high temperature superconductors  

Science Journals Connector (OSTI)

We present a novel technique for the investigation of local variations of the critical current density in large bulk superconductors. In contrast to the usual Hall probe scanning technique, the sample is not magnetized as a whole before the scan, but locally by a small permanent magnet, which is fixed near the Hall probe, during the scanning process. The resulting signal can be interpreted as a qualitative measure of the local shielding currents flowing at the surface.

M Eisterer; S Haindl; T Wojcik; H W Weber

2003-01-01T23:59:59.000Z

297

Thermal Stability and Phase Transformation of Electrochemically Charged/Discharged LiMnPO4 Cathode for Li-Ion Battery  

SciTech Connect

Electrochemically active LiMnPO4 nanoplate at lithiated/delithiated state were subjected to thermal stability and phase transformation evaluate for safety as a cathode material for Li-ion battery. The phase transformation and oxygen evolution temperature on the delithiated MnPO4 were characterized using in-situ hot-stage X-ray diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), thermogravimetric - differential scanning calorimetry - mass spectroscopy (TGA-DSC-MS), transmission electron microscopy and scanning electron microscopy (SEM) - energy dispersive X-ray analysis (EDAX).

Choi, Daiwon; Xiao, Jie; Choi, Young Joon; Hardy, John S.; Vijayakumar, M.; Bhuvaneswari, M. S.; Liu, Jun; Xu, Wu; Wang, Wei; Yang, Zhenguo; Graff, Gordon L.; Zhang, Jiguang

2011-11-01T23:59:59.000Z

298

Scanning white light interferometry in quality control of single-point tape automated bonding  

Science Journals Connector (OSTI)

We report on applying a scanning white light interferometry (SWLI) for quality control of aluminum lead single-point tape automated bonding (spTAB). A spTAB process was used to connect Al leads on a thin polyimide flex to Al bond pads on a flexible Al-polyimide ... Keywords: Bonding, Interferometry

Ivan Vl. Kassamakov; Henri O. Seppänen; Markku J. Oinonen; Edward O. Híggström; J. Mathias Österberg; Juha P. Aaltonen; Heimo Saarikko; Zoran P. Radivojevic

2007-01-01T23:59:59.000Z

299

APPLYING CASCADED PARAMETER SCAN TO STUDY TOP-OFF SAFETY IN NSLS-II STORAGE RING  

SciTech Connect

In this paper we introduce a new algorithm, the cascaded parameter scan method, to efficiently carry out the scan over magnet parameters in the safety analysis for storage ring top-off injection. In top-off safety analysis, one must track particles populating phase space through a beamline containing magnets and apertures and clearly demonstrate that for all possible magnet settings and errors, all particles are lost on scrapers within the properly shielded region. In the usual approach, the number of tracking runs increases exponentially with the number of magnet settings. In the cascaded parameter scan method, the number of tracking runs only increases linearly. This reduction of exponential to linear dependence on the number of set-points, greatly reduces the required computation time and allows one to more densely populate phase space and to increase the number of set-points scanned for each magnet. An example of applying this approach to analyze an NSLS-II beamline, the damping wiggler beamline, is also given.

Li, Y.

2011-03-28T23:59:59.000Z

300

Fast scanning probe for tokamak plasmas J. Boedo, D. Gray, L. Chousal, and R. Conn  

E-Print Network (OSTI)

Fast scanning probe for tokamak plasmas J. Boedo, D. Gray, L. Chousal, and R. Conn Department of tokamaks. The probe described here has five tips which obtain a full spectrum of plasma parameters such as turbulence and anomalous radial particle transport.3 Understanding the tokamak boundary has pro- found

Krstic, Miroslav

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

A model of the spread of randomly scanning Internet worms that saturate access links  

Science Journals Connector (OSTI)

We present a simple, deterministic mathematical model for the spread of randomly scanning and bandwidth-saturating Internet worms. Such worms include Slammer and Witty, both of which spread extremely rapidly. Our model, consisting of coupled Kermack-McKendrick ... Keywords: Internet worms, communications/computer networking, epidemiology, modeling

George Kesidis; Ihab Hamadeh; Youngmi Jin; Soranun Jiwasurat; Milan Vojnovi?

2008-04-01T23:59:59.000Z

302

Narrow band defect luminescence from Al-doped ZnO probed by scanning tunneling cathodoluminescence  

E-Print Network (OSTI)

Institute of Physics. Related Articles Effect of CdS film thickness on the photoexcited carrier lifetime of TiO2/CdS core-shell nanowires Appl. Phys. Lett. 99, 153111 (2011) Current underestimationNarrow band defect luminescence from Al-doped ZnO probed by scanning tunneling cathodoluminescence

Russell, Kasey

303

Length control of individual carbon nanotubes by nanostructuring with a scanning tunneling microscope  

E-Print Network (OSTI)

and quantum-size energy-level splitting.6,7 The quantum transport properties of nanotubes strongly dependLength control of individual carbon nanotubes by nanostructuring with a scanning tunneling of carbon nanotubes. Individual carbon nanotubes can be locally cut by applying a voltage pulse to the tip

304

How to Find Mathematics on a Scanned Page Richard J. Fateman  

E-Print Network (OSTI)

handled by the usual OCR text- based heuristic analysis. The second stream, consisting of material judged a third stream including diagrams, logos, or other miscellaneous material, perhaps including halftones. We on a scanned page of mixed material. It is easy to observe that the accu- racy of commercial OCR programs

Fateman, Richard J.

305

The Effects of Audio and Haptic Feedback on Collaborative Scanning and Placing  

Science Journals Connector (OSTI)

......generated from the PHANTOM device needs to be relied on...mouse over the interface listening for a particular sound...sweeping movements while listening to the sound was the...at least when PHANTOM devices are concerned, when...times back and forth (listening to the empty scan sound......

Jonas Moll; Eva-Lotta Sallnäs Pysander; Kerstin Severinson Eklundh; Sten-Olof Hellström

2014-05-01T23:59:59.000Z

306

SCALAR WIND SPEED AND DIRECTION TROPICAL CYCLONE RETRIEVALS FOR CONICAL SCANNING SCATTEROMETERS  

E-Print Network (OSTI)

SCALAR WIND SPEED AND DIRECTION TROPICAL CYCLONE RETRIEVALS FOR CONICAL SCANNING SCATTEROMETERS--Scatterometer measurements of ocean vector winds (OVW) are significantly degraded in the presence of the precipitation, especially in tropical cyclones. This paper presents a new ocean hurricane/typhoon wind vector retrieval

Hennon, Christopher C.

307

Low resistivity of Pt silicide nanowires measured using double-scanning-probe tunneling microscope  

E-Print Network (OSTI)

experimentally shown to be conductive.8­10 However, RE metal silicide NWs are easily oxidized, so that inert NWs similarly to RE metal silicide NWs.11 It is essential to study the electrical properties, especiallyLow resistivity of Pt silicide nanowires measured using double-scanning- probe tunneling microscope

Kim, Sehun

308

A new pulsed laser deposition technique: Scanning multi-component pulsed laser deposition method  

SciTech Connect

The scanning multi-component pulsed laser deposition (PLD) method realizes uniform depositions of desired coatings by a modified pulsed laser deposition process, preferably with a femto-second laser-system. Multi-component coatings (single or multilayered) are thus deposited onto substrates via laser induced ablation of segmented targets. This is achieved via horizontal line-scanning of a focused laser beam over a uniformly moving target's surface. This process allows to deposit the desired composition of the coating simultaneously, starting from the different segments of the target and adjusting the scan line as a function of target geometry. The sequence and thickness of multilayers can easily be adjusted by target architecture and motion, enabling inter/intra layer concentration gradients and thus functional gradient coatings. This new, simple PLD method enables the achievement of uniform, large-area coatings. Case studies were performed with segmented targets containing aluminum, titanium, and niobium. Under the laser irradiation conditions applied, all three metals were uniformly ablated. The elemental composition within the rough coatings obtained was fixed by the scanned area to Ti-Al-Nb = 1:1:1. Crystalline aluminum, titanium, and niobium were found to coexist side by side at room temperature within the substrate, without alloy formation up to 600 deg. C.

Fischer, D.; Jansen, M. [Max Planck Institute for Solid State Research, Heisenbergstrasse 1, 70569 Stuttgart (Germany); Fuente, G. F. de la [Instituto de Ciencia de Materiales de Aragon (CSIC-Universidad de Zaragoza), Maria de Luna, 3, 50018 Zaragoza (Spain)

2012-04-15T23:59:59.000Z

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

A System Architecture for Sharing De-Identified, Research-Ready Brain Scans  

E-Print Network (OSTI)

A System Architecture for Sharing De-Identified, Research-Ready Brain Scans and Health Information Department of Radiology Abstract. Progress in our understanding of brain disorders increasingly relies on the costly collection of large standardized brain magnetic resonance imaging (MRI) data sets. Moreover

Chervenak, Ann

311

Investigating the Optical Properties of Dislocations by Scanning Transmission Electron Microscopy  

E-Print Network (OSTI)

investigation for solid-state lighting and display applications, and dislocations are known to be nonradiative the radiative pathway and contribute to the enormous savings in energy use and greenhouse gas emissions expected with efficient solid-state lighting. CL Studies of Dislocations One of the key advantages of a scanning micro

Pennycook, Steve

312

Method 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. 9 figs.

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

1999-03-09T23:59:59.000Z

313

Ris-R-1487(EN) RisScan 1.0  

E-Print Network (OSTI)

5.1 TEST 1. Applying weighting factors to RGB value and conversion to Response value. 43 5.2 TEST 2 energy measurement 22 10.2 Automated energy measurement 24 10.3 Settings for energy measurement 25 11 4.5 Electron beam energy measurement 42 5 Tests used for retrospective validation of RisøScan 1.0 43

314

Role of bias voltage and tunneling current in the perpendicular displacements of freestanding graphene via scanning  

E-Print Network (OSTI)

graphene via scanning tunneling microscopy Peng Xu, Steven D. Barber, Matthew L. Ackerman, James Kevin measurements of freestanding graphene as a function of applied bias voltage and tunneling current setpoint, the graphene approaches the STM tip, while, on the other hand, when the tunneling current is increased

Thibado, Paul M.

315

Inverse scattering for frequency-scanned full-field optical coherence tomography  

E-Print Network (OSTI)

Inverse scattering for frequency-scanned full-field optical coherence tomography Daniel L. Marks-field optical coherence tomography (OCT) is able to image an entire en face plane of scatterers simulta- neously: 100.3010, 110.4500. 1. INTRODUCTION The capabilities of optical coherence tomography1,2 (OCT

Bhargava, Rohit

316

Animatable Human Body Model Reconstruction from 3D Scan Data using Templates  

E-Print Network (OSTI)

, we propose a recon- struction pipeline which solves these three prob- lems by fitting a template to be established, which is a time-consuming process. Lee et al. [1] repair the scanned surface of human faces 1: High-level overview of the reconstruction pipeline fitting strategies (where holes are filled

Veltkamp, Remco

317

Predicted scanning tunneling microscopy images of carbon nanotubes with atomic vacancies  

E-Print Network (OSTI)

Predicted scanning tunneling microscopy images of carbon nanotubes with atomic vacancies Arkady V STM images of both metallic and semiconducting single-wall carbon nanotubes with atomic vacancies predict that vacancies should result in the formation of hillock-like features in STM images of metallic

Krasheninnikov, Arkady V.

318

A robust scanning diamond sensor for nanoscale imaging with single nitrogen-vacancy centres  

E-Print Network (OSTI)

A robust scanning diamond sensor for nanoscale imaging with single nitrogen-vacancy centres P and A. Yacoby1 * The nitrogen-vacancy defect centre in diamond1­4 has potential applications processing9 and bioimaging10 . These applications rely on the ability to pos- ition a single nitrogen-vacancy

Walsworth, Ronald L.

319

X-ray optics for scanning fluorescence microscopy and other applications  

SciTech Connect

Scanning x-ray fluorescence microscopy is analogous to scanning electron microscopy. Maps of chemical element distribution are produced by scanning with a very small x-ray beam. Goal is to perform such scanning microscopy with resolution in the range of <1 to 10 {mu}m, using standard laboratory x-ray tubes. We are investigating mirror optics in the Kirkpatrick-Baez (K-B) configuration. K-B optics uses two curved mirrors mounted orthogonally along the optical axis. The first mirror provides vertical focus, the second mirror provides horizontal focus. We have used two types of mirrors: synthetic multilayers and crystals. Multilayer mirrors are used with lower energy radiation such as Cu K{alpha}. At higher energies such as Ag K{alpha}, silicon wafers are used in order to increase the incidence angles and thereby the photon collection efficiency. In order to increase the surface area of multilayers which reflects x-rays at the Bragg angle, we have designed mirrors with the spacing between layers graded along the optic axis in order to compensate for the changing angle of incidence. Likewise, to achieve a large reflecting surface with silicon, the wafers are placed on a specially designed lever arm which is bent into a log spiral by applying force at one end. In this way, the same diffracting angle is maintained over the entire surface of the wafer, providing a large solid angle for photon collection.

Ryon, R.W. [Lawrence Livermore National Lab., CA (United States); Warburton, W.K. [X-Ray Instrumentation Associates, Menlo Park, CA (United States)

1992-05-01T23:59:59.000Z

320

Coal Combustion Fly Ash Characterization: Electron Spectroscopy for Chemical Analysis, Energy Dispersive X-ray Analysis, and Scanning Electron Microscopy  

Science Journals Connector (OSTI)

The surface and bulk properties of five samples of fly ash have been examined by electron spectroscopy for chemical analysis (ESCA), scanning electron microscopy (SEM) and energy...

Rothenberg, S J; Denee, P; Holloway, P

1980-01-01T23:59:59.000Z

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.


321

SCANNING THE TECHNOLOGY Scanning Advanced  

E-Print Network (OSTI)

state of refinement. This has been made possible by advancements in a wide spec- trum of scientific economy, lower emissions and improved safety. The availability of computers on board the vehicle

322

Planning Motions for Robotic Systems Subject to Differential Constraints  

E-Print Network (OSTI)

Planning Motions for Robotic Systems Subject to Differential Constraints Alessandro De Luca of planning point-to-point motion for general robotic systems subject to non-integrable differential feedback linearization, are illustrated with the aid of four case studies: the plate-ball manipulation

De Luca, Alessandro

323

Original Contribution Nrf2 promotes neuronal cell differentiation  

E-Print Network (OSTI)

Original Contribution Nrf2 promotes neuronal cell differentiation Fei Zhao a , Tongde Wu a , Alexandria Lau a , Tao Jiang a , Zheping Huang a , Xiao-Jun Wang a , Weimin Chen a , Pak Kin Wong b , Donna D 2009 Available online 30 June 2009 Keywords: Nrf2 Keap1 Oxidative stress Neuronal differentiation SH

Wong, Pak Kin

324

Pressure Differential Analysis of a Laboratory Animal Room  

E-Print Network (OSTI)

differential can prevent air flow from a low pressure region to a high pressure region. We tested whether the differential pressure is reasonable to regulate the code between the indoors and outdoors, and among laboratory animal rooms, so as to provide a...

Jiang, X.; Liu, Z.; Yoshida, H.; Tang, B.

2006-01-01T23:59:59.000Z

325

Sliding Mode Control of EV Electric Differential System  

E-Print Network (OSTI)

of an electric differential system for Electric Vehicle (EV) with two induction motor drives (one for each wheel of electric drives to control the generated torque and the introduction of an independent control400 1 Sliding Mode Control of EV Electric Differential System A. Haddoun, M. E. H. Benbouzid, D

Paris-Sud XI, Université de

326

Differential Entropy Dynamics: A Possible Cause of Coherence Resonance  

E-Print Network (OSTI)

Coherence resonance can be explained using differential entropy and mutual information. This theory explores the role of external noise in stabilising chaotic circuits such as the uni-junction transistor relaxation oscillator.The phenomenon of coherence resonance maximizes differential entropy and mutual information.Thus most natural chaotic oscillators show coherence resonance in the presence of an external driving noise.

Juhi Rajhans; A. N. Sekar Iyengar

2013-12-01T23:59:59.000Z

327

Differential and Numerically Invariant Signature Curves Applied to Object Recognition  

Science Journals Connector (OSTI)

We introduce a new paradigm, the differential invariant signature curve or manifold, for the invariant recognition of visual objects. A general theorem of É. Cartan implies that two curves are related by a group transformation if and only if ... Keywords: Euclidean group, curve shortening flow, differential invariant, equi-affine group, joint invariant, numerical approximation, object recognition, signature curve, snake, symmetry group

Eugenio Calabi; Peter J. Olver; Chehrzad Shakiban; Allen Tannenbaum; Steven Haker

1998-02-01T23:59:59.000Z

328

A differential game of joint implementation of environmental projects  

Science Journals Connector (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

329

Characterization using thermomechanical and differential thermal analysis of the sinterization of Portland clinker doped with CaF{sub 2}  

SciTech Connect

In this work, the sintering process of Portland cement was studied by combining thermomechanical analysis (TMA) and differential thermal analysis (DTA), together with X-ray diffraction (XRD) and scanning electron microscopy (SEM). Thermal analysis results employing both techniques indicted that phase transformations appeared at lower temperatures when CaF{sub 2} was incorporated in the raw materials. Besides, it was observed at high temperature that in some phase transformations TMA conducts to better resolution compared with the DTA measurements. Furthermore, mechanical properties and X-ray diffraction patterns corroborate the TMA and DTA results, corroborating that the final amount of alite (Ca{sub 3}SiO{sub 5}) is higher when a certain amount of CaF{sub 2} was present during the clinkerization process.

Dominguez, O., E-mail: nanoquimica@yahoo.com [Fac. de Quimica-UASLP, Av. Dr. Salvador Nava 6, CP 78210, San Luis Potosi, SLP (Mexico); Torres-Castillo, A. [Fac. de Quimica-UASLP, Av. Dr. Salvador Nava 6, CP 78210, San Luis Potosi, SLP (Mexico); Flores-Velez, L.M. [Instituto de Metalurgia-UASLP, Sierra Leona 550, CP 78210, San Luis Potosi, SLP (Mexico); Torres, R. [Mexichem Fluor S.A., Eje 106 s/n CP 78395, San Luis Potosi, SLP (Mexico)

2010-04-15T23:59:59.000Z

330

Investigation of the negative differential resistance reproducibility in AlN/GaN double-barrier resonant tunnelling diodes  

SciTech Connect

AlN/GaN double-barrier resonant tunnelling diodes were grown by molecular beam epitaxy on GaN/sapphire template and processed into mesa diameters from 2 {mu}m to 4 {mu}m. The current-voltage characteristics were carried out in direct current operation and under-high vacuum. A sharp negative differential resistance (NDR) was detected in the forward bias at 120 K. The NDR was observed for the mesa size of 2 {mu}m at 4 V with a peak-to-valley current ratio of 3.5. The measurement conditions were chosen to make NDR reproducible more than 50 times and apparent in both scan voltage directions after electrical treatment.

Boucherit, M.; Soltani, A.; Rousseau, M.; Deresmes, D.; Berthe, M.; Durand, C.; De Jaeger, J.-C. [IEMN/UMR-CNRS 8520, Universite Lille1, PRES Universite Lille Nord de France (France); Monroy, E. [Equipe mixte CEA-CNRS-UJF Nanophysique et Semiconducteurs, DRFMC/SP2M/PSC, CEA-Grenoble (France)

2011-10-31T23:59:59.000Z

331

Versatile Silicon Photodiode Detector Technology for Scanning Electron Microscopy with High-Efficiency Sub-5 keV Electron Detection  

E-Print Network (OSTI)

Versatile Silicon Photodiode Detector Technology for Scanning Electron Microscopy with High for Scanning Electron Microscopy, based on ultrashallow p+ n boron-layer photodiodes, features nm-thin anodes, closely-packed photodiodes and through-wafer apertures allow flexible configurations for optimal material

Technische Universiteit Delft

332

Synthesis and structure of Al clusters supported on TiO2,,110...: A scanning tunneling microscopy study  

E-Print Network (OSTI)

Synthesis and structure of Al clusters supported on TiO2,,110...: A scanning tunneling microscopy, Texas 77843-3255 Received 14 October 1997; accepted 6 April 1998 Al clusters supported on TiO2(110) have been investigated using scanning tunneling microscopy. Al interacts strongly with the TiO2(110) surface

Goodman, Wayne

333

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

334

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

335

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

336

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

337

Deformation induced changes in surface properties of polymers investigated by scanning force microscopy  

E-Print Network (OSTI)

In this study the possibility of combining commercial Scanning Force Microscopes (SFM) with stretching devices for the investigation of microscopic surface changes during stepwise elongation is investigated. Different types of stretching devices have been developed either for Scanning Platform-SFM or for Stand Alone-SFM. Their suitability for the investigation of deformation induced surface changes is demonstrated. A uniaxially oriented polypropylene film is stretched vertically to its extrusion direction. The reorientation of its microfibrillar structure is investigated and correlated to macroscopic structural changes determined by taking a force-elongation curve. Microtome cuts of natural rubber filled with 15 PHR carbon black are stretched. Changes in topography, local stiffness and adhesive force are simultaneously reported by using a new imaging method called Pulsed Force Mode (PFM).

Sabine Hild; Armin Rosa; Othmar Marti

2013-12-10T23:59:59.000Z

338

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

SciTech Connect

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

339

Efficient don't care filling and scan chain masking for low-power testing  

Science Journals Connector (OSTI)

This paper addresses two methods for reducing power consumption during testing. The first one is to assign suitable values to the unspecified bits (don't cares) in the test patterns so that both static and dynamic power are reduced. The second technique discusses the issue of blocking pattern selection for reducing power consumption during circuit testing in a scan-based approach. The blocking pattern is used to prevent the scan chain transitions from reaching circuit inputs. This, though reduces dynamic power significantly, can result in quite an increase in the leakage power. We have presented a novel approach to select a blocking pattern using genetic algorithm and use it properly so that both dynamic and leakage power are reduced.

Subhadip Kundu; Santanu Chattopadhyay

2012-01-01T23:59:59.000Z

340

An efficient protocol for radiochromic film dosimetry combining calibration and measurement in a single scan  

SciTech Connect

Purpose: Radiochromic film provides dose measurement at high spatial resolution, but often is not preferred for routine evaluation of patient-specific intensity modulated radiation therapy (IMRT) plans owing to ease-of-use factors. The authors have established an efficient protocol that combines calibration and measurement in a single scan and enables measurement results to be obtained in less than 30 min. This avoids complications due to postexposure changes in radiochromic film that delay the completion of a measurement, often for up to 24 h, in commonly used methods. In addition, the protocol addresses the accuracy and integrity of the measurement by eliminating environmental and interscan variability issues. Methods: The authors collected dose-response data from six production lots of Gafchromic EBT3 film and three production lots of EBT2 film at doses up to 480 cGy. In this work, the authors used seven different scanners of two different models-Epson 10000XL and V700; postexposure times before scanning from 30 min to 9 days; ambient temperatures for scanning spanning 11 Degree-Sign C; and two film orientations. Scanning was in 48-bit RGB format at 72 dpi resolution. Dose evaluation was conducted using a triple-channel dosimetry method. To evaluate the measurement protocol, patient specific IMRT and volumetric modulated arc therapy (VMAT) plans were exposed onto EBT3 films on a Varian Trilogy Linac. Film scanning was done following the protocol under a number of different conditions and the dose maps were analyzed to demonstrate the equivalence of results. Results: The results indicated that the dose-response data could be fit by a set of related rational functions leading to the description of a generic calibration curve. A simplified dosimetry protocol was established where dose-response data for a specific film lot, scanner, and scanning conditions could be derived from two films exposed to known doses. In most cases only one calibrated exposure was required since the dose for one of the films could be zero. Using the Gamma test criterion of 2%/2 mm to evaluate the measurements, similar passing rates ranging between about 95% and 99% for the fields studied were obtained from application films digitized under a variety of conditions all of them different than the conditions under which the calibration films were scanned. Conclusions: The authors have developed a simplified and efficient protocol to measure doses delivered by an IMRT or VMAT plan using only the patient film, one calibration film, one unexposed film, and applying a single scan to acquire a digital image for calculation and analysis. The simplification and timesaving offer a potential practical solution for using radiochromic film for routine treatment plan quality assurance without sacrificing spatial resolution for convenience.

Lewis, David; Micke, Andre; Yu Xiang; Chan, Maria F. [Advanced Materials Group, Ashland Inc., 1361 Alps Road, Wayne, New Jersey 07470 (United States); Department of Medical Physics, Memorial Sloan-Kettering Cancer Center, 136 Mountain View Boulevard, Basking Ridge, New Jersey 07920 (United States)

2012-10-15T23:59:59.000Z

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.


341

Electronic structure of wurtzite II-VI compound semiconductor cleavage surfaces studied by scanning tunneling microscopy  

Science Journals Connector (OSTI)

We report atomically resolved scanning tunneling microscopy (STM) images of cleavage surfaces of wurtzite II-VI compound semiconductors. CdSe(112¯0), CdSe(101¯0), and CdS(101¯0) were investigated. The STM images confirm a 1×1 reconstruction for all surfaces. At negative and positive sample voltages the occupied and empty dangling-bond states above anions and cations, respectively, dominate the contrast of the STM images. No states in the band gap were found. The electronic structure of the surface permits the observation of dopant atoms in subsurface layers and thus also cross-sectional scanning tunneling microscopy studies of point defects and heterostructures.

B. Siemens, C. Domke, Ph. Ebert, and K. Urban

1997-11-15T23:59:59.000Z

342

Automated placement of stereotactic injections using a laser scan of the skull  

E-Print Network (OSTI)

Stereotactic targeting is a commonly used technique for performing injections in the brains of mice and other animals. The most common method for targeting stereoscopic injections uses the skull indentations bregma and lambda as reference points and is limited in its precision by factors such as skull curvature and individual variation, as well as an incomplete correspondence between skull landmarks and brain locations. In this software tool, a 3D laser scan of the mouse skull is taken in vitro and registered onto a reference skull using a point cloud matching algorithm, and the parameters of the transformation are used to position a glass pipette to place tracer injections. The software was capable of registering sample skulls with less than 100 micron error, and was able to target an injection in a mouse with error of roughly 500 microns. These results indicate that using skull scan registration has the potential to be widely applicable in automating stereotactic targeting of tracer injections.

Henderson, Margaret; Tolpygo, Alexander; Savoia, Stephen; Grange, Pascal; Mitra, Partha

2014-01-01T23:59:59.000Z

343

Axial-scanning low-coherence interferometer method for noncontact thickness measurement of biological samples  

SciTech Connect

We investigated a high-precision optical method for measuring the thickness of biological samples regardless of their transparency. The method is based on the precise measurement of optical path length difference of the end surfaces of objects, using a dual-arm axial-scanning low-coherence interferometer. This removes any consideration of the shape, thickness, or transparency of testing objects when performing the measurement. Scanning the reference simplifies the measurement setup, resulting in unambiguous measurement. Using a 1310 nm wavelength superluminescent diode, with a 65 nm bandwidth, the measurement accuracy was as high as 11.6 {mu}m. We tested the method by measuring the thickness of both transparent samples and nontransparent soft biological tissues.

Kim, Do-Hyun; Song, Chul-Gyu; Ilev, Ilko K.; Kang, Jin U.

2011-02-20T23:59:59.000Z

344

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,

345

Examination of the cu/si(111) 5×5 structure by scanning tunneling microscopy  

Science Journals Connector (OSTI)

The incommensurate 5×5 Cu/Si(111) structure has been examined by scanning tunneling microscopy. Images show that the surface structure is not well described as a hexagonal copper layer modulated at the Si(111) periodicity. Rather, the surface breaks up into 5×5 subunits which pack at spacings varying from 5 to 7 lattice constants, implying that substrate-adsorbate interactions dominate lateral interactions within the Cu adlayer.

R. J. Wilson; S. Chiang; F. Salvan

1988-12-15T23:59:59.000Z

346

An elastography method based on the scanning contact resonance of a piezoelectric cantilever  

SciTech Connect

Purpose: Most tissues may become significantly stiffer than their normal states when there are lesions inside. The tissue's modulus can then act as an identification parameter for clinic diagnosis of tumors or fibrosis, which leads to elastography. This study introduces a novel elastography method that can be used for modulus imaging of superficial organs. Methods: This method is based on the scanning contact-resonance of a unimorph piezoelectric cantilever. The cantilever vibrates in its bending mode with the tip pressed tightly on the sample. The contact resonance frequency of the cantilever-sample system is tracked at each scanning point, from which the sample's modulus can be derived based on a beam dynamic model and a contact mechanics model. Scanning is performed by a three-dimensional motorized stage and the whole system is controlled by a homemade software program based on LabVIEW. Results: Testing onin vitro beef tissues indicates that the fat and the muscle can be easily distinguished using this system, and the accuracy of the modulus measurement can be comparable with that of nanoindentation. Imaging on homemade gelatin phantoms shows that the depth information of the abnormalities can be qualitatively obtained by varying the pressing force. The detection limit of this elastography method is specially examined both experimentally and numerically. Results show that it can detect the typical lesions in superficial organs with the depth of several centimeters. The lateral resolution of this elastography method/system is better than 0.5 mm, and could be further enhanced by using more scanning points. Conclusions: The proposed elastography system can be regarded as a sensitive palpation robot, which may be very promising in early diagnosis of tumors in superficial organs such as breast and thyroid.

Fu, Ji; Li, Faxin, E-mail: lifaxin@pku.edu.cn [State Key Lab for Turbulence and Complex Systems, College of Engineering, Peking University, Beijing 100871, China and HEDPS, Center for Applied Physics and Technologies, Peking University, Beijing 100871 (China)] [State Key Lab for Turbulence and Complex Systems, College of Engineering, Peking University, Beijing 100871, China and HEDPS, Center for Applied Physics and Technologies, Peking University, Beijing 100871 (China)

2013-12-15T23:59:59.000Z

347

UNDERSTANDING THE EFFECTS OF SURFACTANT ADDITION ON RHEOLOGY USING LASER SCANNING CONFOCAL MICROSCOPY  

SciTech Connect

The effectiveness of three dispersants to modify rheology was examined using rheology measurements and laser scanning confocal microscopy (LSCM) in simulated waste solutions. All of the dispersants lowered the yield stress of the slurries below the baseline samples. The rheology curves were fitted reasonably to a Bingham Plastic model. The three-dimensional LSCM images of simulants showed distinct aggregates were greatly reduced after the addition of dispersants leading to a lowering of the yield stress of the simulated waste slurry solutions.

White, T

2007-05-08T23:59:59.000Z

348

Estimation of organ and effective dose due to Compton backscatter security scans  

SciTech Connect

Purpose: To estimate organ and effective radiation doses due to backscatter security scanners using Monte Carlo simulations and a voxelized phantom set. Methods: Voxelized phantoms of male and female adults and children were used with the GEANT4 toolkit to simulate a backscatter security scan. The backscatter system was modeled based on specifications available in the literature. The simulations modeled a 50 kVp spectrum with 1.0 mm-aluminum-equivalent filtration and a previously measured exposure of approximately 4.6 {mu}R at 30 cm from the source. Photons and secondary interactions were tracked from the source until they reached zero kinetic energy or exited from the simulation's boundaries. The energy deposited in the phantoms' respective organs was tallied and used to calculate total organ dose and total effective dose for frontal, rear, and full scans with subjects located 30 and 75 cm from the source. Results: For a full screen, all phantoms' total effective doses were below the established 0.25 {mu}Sv standard, with an estimated maximum total effective dose of 0.07 {mu}Sv for full screen of a male child. The estimated maximum organ dose due to a full screen was 1.03 {mu}Gy, deposited in the adipose tissue of the male child phantom when located 30 cm from the source. All organ dose estimates had a coefficient of variation of less than 3% for a frontal scan and less than 11% for a rear scan. Conclusions: Backscatter security scanners deposit dose in organs beyond the skin. The effective dose is below recommended standards set by the Health Physics Society (HPS) and the American National Standards Institute (ANSI) assuming the system provides a maximum exposure of approximately 4.6 {mu}R at 30 cm.

Hoppe, Michael E.; Schmidt, Taly Gilat [Department of Biomedical Engineering, Marquette University, P.O. Box 1881, Milwaukee, Wisconsin 53201 (United States)

2012-06-15T23:59:59.000Z

349

Transmission-mode imaging in the environmental scanning electron microscope (ESEM)  

E-Print Network (OSTI)

sources function by heating a material until it starts to emit electrons (by increasing the energy of free electrons to above the Fermi surface of the material) and field-emission sources function by applying an electric field strong enough that electrons... obtained from studying E. coli, C. necator, and S. Typhimurium (Chapter 8) have been accepted for publication in Scanning, titled “The application of STEM and in-situ controlled dehydration to bac- terial systems using ESEM”. i Acknowledgements This project...

Staniewicz, Lech Thomas Leif

2012-02-07T23:59:59.000Z

350

Design and calibration of a scanning tunneling microscope for large machined surfaces  

SciTech Connect

During the last year the large sample STM has been designed, built and used for the observation of several different samples. Calibration of the scanner for prope dimensional interpretation of surface features has been a chief concern, as well as corrections for non-linear effects such as hysteresis during scans. Several procedures used in calibration and correction of piezoelectric scanners used in the laboratorys STMs are described.

Grigg, D.A.; Russell, P.E.; Dow, T.A.

1988-12-01T23:59:59.000Z

351

The Use of Infrared Scanning in the Food and Fiber Industry  

E-Print Network (OSTI)

. to identify inefficiency through poor design, There are a number of scanning devices with inferior workmanship, or operational failure of differing capabilities on the market. The equip- equipment or material. An infrared inspection ment that appears... be pieces of equipment in one day. attached to reproduce an image. The photograph External inspection of a building may reveal j i : I ! I I I provides a permanent record with information that information about its construction failure, such can...

Kuhn, D. F.

1980-01-01T23:59:59.000Z

352

High precision ultrasonic scanning system and SAFT-UT (synthetic aperture technique) development  

SciTech Connect

The NDT divisions at SNLA are continually striving to anticipate customer requests by adding advanced test facilities. This paper describes a new ultrasonic testing system being developed in Albuquerque to provide precise scanning of smaller test objects. There are two major subsystems that make-up the ultrasonic testing system, a high precision scanner/digitizer and a real-time processing system which automates the synthetic aperture focusing technique. These subsystems are described in the following sections.

Shurtleff, W.W.

1987-06-01T23:59:59.000Z

353

Characterization of grain boundary conductivity of spin-sprayed ferrites using scanning microwave microscope  

SciTech Connect

Grain boundary electrical conductivity of ferrite materials has been characterized using scanning microwave microscope. Structural, electrical, and magnetic properties of Fe{sub 3}O{sub 4} spin-sprayed thin films onto glass substrates for different length of growth times were investigated using a scanning microwave microscope, an atomic force microscope, a four-point probe measurement, and a made in house transmission line based magnetic permeameter. The real part of the magnetic permeability shows almost constant between 10 and 300?MHz. As the Fe{sub 3}O{sub 4} film thickness increases, the grain size becomes larger, leading to a higher DC conductivity. However, the loss in the Fe{sub 3}O{sub 4} films at high frequency does not increase correspondingly. By measuring the reflection coefficient s{sub 11} from the scanning microwave microscope, it turns out that the grain boundaries of the Fe{sub 3}O{sub 4} films exhibit higher electric conductivity than the grains, which contributes loss at radio frequencies. This result will provide guidance for further improvement of low loss ferrite materials for high frequency applications.

Myers, J.; Nicodemus, T.; Zhuang, Y., E-mail: yan.zhuang@wright.edu [Department of Electrical Engineering, Wright State University, Dayton, Ohio 45435 (United States); Watanabe, T.; Matsushita, N. [Materials and Structures Laboratory, Tokyo Institute of Technology, Yokohama (Japan); Yamaguchi, M. [Department of Electrical Engineering, Tohoku University, Sendai 980-8579 (Japan)

2014-05-07T23:59:59.000Z

354

Reversible differentiation of myofibroblasts by MyoD  

SciTech Connect

Myofibroblasts participate in tissue repair processes in diverse mammalian organ systems. The deactivation of myofibroblasts is critical for termination of the reparative response and restoration of tissue structure and function. The current paradigm on normal tissue repair is the apoptotic clearance of terminally differentiated myofibroblasts; while, the accumulation of activated myofibroblasts is associated with progressive human fibrotic disorders. The capacity of myofibroblasts to undergo de-differentiation as a potential mechanism for myofibroblast deactivation has not been examined. In this report, we have uncovered a role for MyoD in the induction of myofibroblast differentiation by transforming growth factor-{beta}1 (TGF-{beta}1). Myofibroblasts demonstrate the capacity for de-differentiation and proliferation by modulation of endogenous levels of MyoD. We propose a model of reciprocal signaling between TGF-{beta}1/ALK5/MyoD and mitogen(s)/ERK-MAPK/CDKs that regulate myofibroblast differentiation and de-differentiation, respectively. Our studies provide the first evidence for MyoD in controlling myofibroblast activation and deactivation. Restricted capacity for de-differentiation of myofibroblasts may underlie the progressive nature of recalcitrant human fibrotic disorders.

Hecker, Louise; Jagirdar, Rajesh; Jin, Toni; Thannickal, Victor J., E-mail: vjthan@uab.edu

2011-08-01T23:59:59.000Z

355

Integrator complex plays an essential role in adipose differentiation  

SciTech Connect

Highlights: •IntS6 and IntS11 are subunits of the Integrator complex. •Expression levels of IntS6 and IntS11 were very low in 3T3-L1 fibroblast. •IntS6 and IntS11 were upregulated during adipose differentiation. •Suppression of IntS6 or IntS11 expression inhibited adipose differentiation. -- Abstract: The dynamic process of adipose differentiation involves stepwise expressions of transcription factors and proteins specific to the mature fat cell phenotype. In this study, it was revealed that expression levels of IntS6 and IntS11, subunits of the Integrator complex, were increased in 3T3-L1 cells in the period when the cells reached confluence and differentiated into adipocytes, while being reduced to basal levels after the completion of differentiation. Suppression of IntS6 or IntS11 expression using siRNAs in 3T3-L1 preadipocytes markedly inhibited differentiation into mature adipocytes, based on morphological findings as well as mRNA analysis of adipocyte-specific genes such as Glut4, perilipin and Fabp4. Although Ppar?2 protein expression was suppressed in IntS6 or IntS11-siRNA treated cells, adenoviral forced expression of Ppar?2 failed to restore the capacity for differentiation into mature adipocytes. Taken together, these findings demonstrate that increased expression of Integrator complex subunits is an indispensable event in adipose differentiation. Although further study is necessary to elucidate the underlying mechanism, the processing of U1, U2 small nuclear RNAs may be involved in cell differentiation steps.

Otani, Yuichiro; Nakatsu, Yusuke [Department of Medical Chemistry, Division of Molecular Medical Science, Graduate School of Biomedical Sciences, Hiroshima University (Japan)] [Department of Medical Chemistry, Division of Molecular Medical Science, Graduate School of Biomedical Sciences, Hiroshima University (Japan); Sakoda, Hideyuki [Department of Internal Medicine, Graduate School of Medicine, University of Tokyo, Tokyo (Japan)] [Department of Internal Medicine, Graduate School of Medicine, University of Tokyo, Tokyo (Japan); Fukushima, Toshiaki [Department of Medical Chemistry, Division of Molecular Medical Science, Graduate School of Biomedical Sciences, Hiroshima University (Japan)] [Department of Medical Chemistry, Division of Molecular Medical Science, Graduate School of Biomedical Sciences, Hiroshima University (Japan); Fujishiro, Midori [Department of Internal Medicine, Graduate School of Medicine, University of Tokyo, Tokyo (Japan)] [Department of Internal Medicine, Graduate School of Medicine, University of Tokyo, Tokyo (Japan); Kushiyama, Akifumi [Department of Internal Medicine, The Institute for Adult Diseases, Asahi Life Foundation, Tokyo (Japan)] [Department of Internal Medicine, The Institute for Adult Diseases, Asahi Life Foundation, Tokyo (Japan); Okubo, Hirofumi; Tsuchiya, Yoshihiro; Ohno, Haruya [Department of Medical Chemistry, Division of Molecular Medical Science, Graduate School of Biomedical Sciences, Hiroshima University (Japan)] [Department of Medical Chemistry, Division of Molecular Medical Science, Graduate School of Biomedical Sciences, Hiroshima University (Japan); Takahashi, Shin-Ichiro [Graduate School of Agriculture and Life Sciences, University of Tokyo, Tokyo (Japan)] [Graduate School of Agriculture and Life Sciences, University of Tokyo, Tokyo (Japan); Nishimura, Fusanori [Department of Dental Science for Health Promotion, Division of Cervico-Gnathostomatology, Graduate School of Biomedical Sciences, Hiroshima University, Hiroshima (Japan)] [Department of Dental Science for Health Promotion, Division of Cervico-Gnathostomatology, Graduate School of Biomedical Sciences, Hiroshima University, Hiroshima (Japan); Kamata, Hideaki [Department of Medical Chemistry, Division of Molecular Medical Science, Graduate School of Biomedical Sciences, Hiroshima University (Japan)] [Department of Medical Chemistry, Division of Molecular Medical Science, Graduate School of Biomedical Sciences, Hiroshima University (Japan); Katagiri, Hideki [Division of Molecular Metabolism and Diabetes, Tohoku University Graduate School of Medicine, Sendai (Japan)] [Division of Molecular Metabolism and Diabetes, Tohoku University Graduate School of Medicine, Sendai (Japan); Asano, Tomoichiro, E-mail: tasano@hiroshima-u.ac.jp [Department of Medical Chemistry, Division of Molecular Medical Science, Graduate School of Biomedical Sciences, Hiroshima University (Japan)] [Department of Medical Chemistry, Division of Molecular Medical Science, Graduate School of Biomedical Sciences, Hiroshima University (Japan)

2013-05-03T23:59:59.000Z

356

A Unified Differential Evolution Algorithm for Global Optimization  

SciTech Connect

Abstract?In this paper, we propose a new unified differential evolution (uDE) algorithm for single objective global optimization. Instead of selecting among multiple mutation strategies as in the conventional differential evolution algorithm, this algorithm employs a single equation as the mutation strategy. It has the virtue of mathematical simplicity and also provides users the flexbility for broader exploration of different mutation strategies. Numerical tests using twelve basic unimodal and multimodal functions show promising performance of the proposed algorithm in comparison to convential differential evolution algorithms.

Qiang, Ji; Mitchell, Chad

2014-06-24T23:59:59.000Z

357

Scanning Cloud Radar Observations at Azores: Preliminary 3D Cloud Products  

SciTech Connect

The deployment of the Scanning W-Band ARM Cloud Radar (SWACR) during the AMF campaign at Azores signals the first deployment of an ARM Facility-owned scanning cloud radar and offers a prelude for the type of 3D cloud observations that ARM will have the capability to provide at all the ARM Climate Research Facility sites by the end of 2010. The primary objective of the deployment of Scanning ARM Cloud Radars (SACRs) at the ARM Facility sites is to map continuously (operationally) the 3D structure of clouds and shallow precipitation and to provide 3D microphysical and dynamical retrievals for cloud life cycle and cloud-scale process studies. This is a challenging task, never attempted before, and requires significant research and development efforts in order to understand the radar's capabilities and limitations. At the same time, we need to look beyond the radar meteorology aspects of the challenge and ensure that the hardware and software capabilities of the new systems are utilized for the development of 3D data products that address the scientific needs of the new Atmospheric System Research (ASR) program. The SWACR observations at Azores provide a first look at such observations and the challenges associated with their analysis and interpretation. The set of scan strategies applied during the SWACR deployment and their merit is discussed. The scan strategies were adjusted for the detection of marine stratocumulus and shallow cumulus that were frequently observed at the Azores deployment. Quality control procedures for the radar reflectivity and Doppler products are presented. Finally, preliminary 3D-Active Remote Sensing of Cloud Locations (3D-ARSCL) products on a regular grid will be presented, and the challenges associated with their development discussed. In addition to data from the Azores deployment, limited data from the follow-up deployment of the SWACR at the ARM SGP site will be presented. This effort provides a blueprint for the effort required for the development of 3D cloud products from all new SACRs that the program will deploy at all fixed and mobile sites by the end of 2010.

Kollias, P.; Johnson, K.; Jo, I.; Tatarevic, A.; Giangrande, S.; Widener, K.; Bharadwaj, N.; Mead, J.

2010-03-15T23:59:59.000Z

358

Caspase 3 activity is required for skeletal muscle differentiation  

Science Journals Connector (OSTI)

...MAPK activity. Indeed, such a contention bears significant merit when one considers that differentiating myoblasts share a remarkable...Chem. 274,19211 -19219. 10383428 27 Frasch S. C. , Nick, J. A., Fadok, V. A., Bratton, D. L., Worthen...

Pasan Fernando; John F. Kelly; Kim Balazsi; Ruth S. Slack; Lynn A. Megeney

2002-01-01T23:59:59.000Z

359

On fractional differential inclusions with the Jumarie derivative  

SciTech Connect

In the paper, fractional differential inclusions with the Jumarie derivative are studied. We discuss the existence and uniqueness of a solution to such problems. Our study relies on standard variational methods.

Kamocki, Rafa?, E-mail: rafkam@math.uni.lodz.pl [Faculty of Mathematics and Computer Science, Chair of Differential Equations and Computer Science, University of Lodz, Banacha 22, 90-238 Lodz (Poland)] [Faculty of Mathematics and Computer Science, Chair of Differential Equations and Computer Science, University of Lodz, Banacha 22, 90-238 Lodz (Poland); Obczy?ski, Cezary, E-mail: czacza@math.uni.lodz.pl [Faculty of Mathematics and Computer Science, Chair of Nonlinear Analysis, University of Lodz, Banacha 22, 90-238 Lodz (Poland)] [Faculty of Mathematics and Computer Science, Chair of Nonlinear Analysis, University of Lodz, Banacha 22, 90-238 Lodz (Poland)

2014-02-15T23:59:59.000Z

360

On the rank function of a differential poset  

E-Print Network (OSTI)

We study r-differential posets, a class of combinatorial objects introduced in 1988 by the first author, which gathers together a number of remarkable combinatorial and algebraic properties, and generalizes important ...

Stanley, Richard P.

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361

Commuting differential operators of rank 2 with polynomial coefficients  

E-Print Network (OSTI)

In this paper we study self-adjoint commuting ordinary differential operators with polynomial coefficients. These operators define commutative subalgebras of the first Weyl algebra. We find new examples of commuting operators of rank 2.

Vardan Oganesyan

2014-09-29T23:59:59.000Z

362

Procedures to predict vertical differential soil movement for expansive soils  

E-Print Network (OSTI)

, 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...

Naiser, Donald David

2012-06-07T23:59:59.000Z

363

Intro to Differential Equations MATH 2070 (Winter 2012)  

E-Print Network (OSTI)

Intro to Differential Equations MATH 2070 (Winter 2012) Solving Linear Systems -- Complex to . 3. Write Yc (t) = et Vc = e(+i)t Vc = et (cos (t) + i sin (t)) (Vre + iVim) where both Vre and Vim

Hagler, Jim

364

18.303 Linear Partial Differential Equations, Fall 2005  

E-Print Network (OSTI)

The classical partial differential equations of applied mathematics: diffusion, Laplace/Poisson, and wave equations. Methods of solution, such as separation of variables, Fourier series and transforms, eigenvalue problems. ...

Hancock, Matthew James, 1975-

365

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.

366

Solving second order linear differential equations with Klein's theorem  

Science Journals Connector (OSTI)

Given a second order linear differential equations with coefficients in a field k=C(x), the Kovacic algorithm finds all Liouvillian solutions, that is, solutions that one can write in terms of exponentials, logarithms, integration ...

M. van Hoeij; J.-A. Weil

2005-07-01T23:59:59.000Z

367

Differential properties of Euclidean projection onto power cone  

E-Print Network (OSTI)

Aug 19, 2014 ... Abstract: In this paper, we study differential properties of Euclidean projection onto the power cone $K^{(p,q)}_n=\\{(x,y,z)\\in \\mathbb{R}_+\\times ...

Le Thi Khanh Hien

2014-08-19T23:59:59.000Z

368

A case study of computational differentiation applied to neutron scattering  

Science Journals Connector (OSTI)

In a neutron scattering application, an unconstrained nonlinear minimization problem is used for the fitting of model parameters to experimental data. Automatic differentiation enables, in a completely mechanical fashion, algorithmic changes by switching ...

Christian H. Bischof; H. Martin Bücker; Dieter an Mey

2000-10-01T23:59:59.000Z

369

Origin of two differentiation trends in the Emeishan flood basalts  

Science Journals Connector (OSTI)

Both the Bowen and Fenner differentiation trends have been recognized in the ... , the lavas from Guizhou evolved along the Fenner trend leading to the magmas with high...2O3 (23%) and low SiO2 (44%) contents. Th...

Yigang Xu; Houjun Mei; Jifeng Xu; Xiaolong Huang; Yuejun Wang…

2003-02-01T23:59:59.000Z

370

Differentiated curriculum: real help for the classroom teacher  

E-Print Network (OSTI)

DIFFERENTIATED CURRICULUM: REAL HELP FOR THE CLASSROOM TEACHER A Thesis by MARGARET ANN BRYANT Submitted to the Graduate College of Texas A&M University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE August... 1987 Major Subject: Curriculum and Instruction DIFFERENTIATED CURRICULUM: REAL HELP FOR THE CLASSROOM TEACHER A Thesis by MARGARET ANN BRYANT Approved as to style and content by: a . Alexander ( ir of Committee) David G. Armstrong P~ William...

Bryant, Margaret Ann

1987-01-01T23:59:59.000Z

371

CT head-scan dosimetry in an anthropomorphic phantom and associated measurement of ACR accreditation-phantom imaging metrics under clinically representative scan conditions  

SciTech Connect

Purpose: To measure radiation absorbed dose and its distribution in an anthropomorphic head phantom under clinically representative scan conditions in three widely used computed tomography (CT) scanners, and to relate those dose values to metrics such as high-contrast resolution, noise, and contrast-to-noise ratio (CNR) in the American College of Radiology CT accreditation phantom.Methods: By inserting optically stimulated luminescence dosimeters (OSLDs) in the head of an anthropomorphic phantom specially developed for CT dosimetry (University of Florida, Gainesville), we measured dose with three commonly used scanners (GE Discovery CT750 HD, Siemens Definition, Philips Brilliance 64) at two different clinical sites (Walter Reed National Military Medical Center, National Institutes of Health). The scanners were set to operate with the same data-acquisition and image-reconstruction protocols as used clinically for typical head scans, respective of the practices of each facility for each scanner. We also analyzed images of the ACR CT accreditation phantom with the corresponding protocols. While the Siemens Definition and the Philips Brilliance protocols utilized only conventional, filtered back-projection (FBP) image-reconstruction methods, the GE Discovery also employed its particular version of an adaptive statistical iterative reconstruction (ASIR) algorithm that can be blended in desired proportions with the FBP algorithm. We did an objective image-metrics analysis evaluating the modulation transfer function (MTF), noise power spectrum (NPS), and CNR for images reconstructed with FBP. For images reconstructed with ASIR, we only analyzed the CNR, since MTF and NPS results are expected to depend on the object for iterative reconstruction algorithms.Results: The OSLD measurements showed that the Siemens Definition and the Philips Brilliance scanners (located at two different clinical facilities) yield average absorbed doses in tissue of 42.6 and 43.1 mGy, respectively. The GE Discovery delivers about the same amount of dose (43.7 mGy) when run under similar operating and image-reconstruction conditions, i.e., without tube current modulation and ASIR. The image-metrics analysis likewise showed that the MTF, NPS, and CNR associated with the reconstructed images are mutually comparable when the three scanners are run with similar settings, and differences can be attributed to different edge-enhancement properties of the applied reconstruction filters. Moreover, when the GE scanner was operated with the facility's scanner settings for routine head exams, which apply 50% ASIR and use only approximately half of the 100%-FBP dose, the CNR of the images showed no significant change. Even though the CNR alone is not sufficient to characterize the image quality and justify any dose reduction claims, it can be useful as a constancy test metric.Conclusions: This work presents a straightforward method to connect direct measurements of CT dose with objective image metrics such as high-contrast resolution, noise, and CNR. It demonstrates that OSLD measurements in an anthropomorphic head phantom allow a realistic and locally precise estimation of magnitude and spatial distribution of dose in tissue delivered during a typical CT head scan. Additional objective analysis of the images of the ACR accreditation phantom can be used to relate the measured doses to high contrast resolution, noise, and CNR.

Brunner, Claudia C.; Stern, Stanley H.; Chakrabarti, Kish [U.S. Food and Drug Administration, 10903 New Hampshire Avenue, Silver Spring, Maryland 20993 (United States)] [U.S. Food and Drug Administration, 10903 New Hampshire Avenue, Silver Spring, Maryland 20993 (United States); Minniti, Ronaldo [National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899 (United States)] [National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899 (United States); Parry, Marie I. [Walter Reed National Military Medical Center, 8901 Rockville Pike, Bethesda, Maryland 20889 (United States)] [Walter Reed National Military Medical Center, 8901 Rockville Pike, Bethesda, Maryland 20889 (United States); Skopec, Marlene [National Institutes of Health, 9000 Rockville Pike, Bethesda, Maryland 20892 (United States)] [National Institutes of Health, 9000 Rockville Pike, Bethesda, Maryland 20892 (United States)

2013-08-15T23:59:59.000Z

372

E-Print Network 3.0 - alters tissue differentiation Sample Search...  

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

in the stomach: differentiating dysplasia from normal tissue Summary: (Mahadevan-Jansen and Richards-Kortum, 1996). For differentiation of normal and precancerous tissues,...

373

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

SciTech Connect

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 SACR measurements is discussed. First, a feature mask algorithm that objectively determines the presence of significant radar returns is described. The feature mask algorithm is based on the statistical properties of radar receiver noise. It accounts for atmospheric emission and is applicable even for SACR profiles with few or no signal-free range gates. Using the nearest-in-time atmospheric sounding, the SACR radar reflectivities are corrected for gaseous attenuation (water vapor and oxygen) using a line-by-line absorption model. Despite having a high pulse repetition frequency, the SACR has a narrow Nyquist velocity limit and thus Doppler velocity folding is commonly observed. An unfolding algorithm that makes use of a first guess for the true Doppler velocity using horizontal wind measurements from the nearest sounding is described. The retrieval of the horizontal wind profile from the Hemispherical Sky – Range Height Indicator SACR scan observations and/or nearest sounding is described. The retrieved horizontal wind profile can be used to adaptively configure SACR scan strategies that depend on wind direction. Several remaining challenges are discussed, including the removal of insect and second-trip echoes. The described algorithms significantly enhance SACR data quality and constitute an important step towards the utilization of SACR measurements for cloud research.

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

2014-03-01T23:59:59.000Z

374

Ultrafast dark-field surface inspection with hybrid-dispersion laser scanning  

SciTech Connect

High-speed surface inspection plays an important role in industrial manufacturing, safety monitoring, and quality control. It is desirable to go beyond the speed limitation of current technologies for reducing manufacturing costs and opening a new window onto a class of applications that require high-throughput sensing. Here, we report a high-speed dark-field surface inspector for detection of micrometer-sized surface defects that can travel at a record high speed as high as a few kilometers per second. This method is based on a modified time-stretch microscope that illuminates temporally and spatially dispersed laser pulses on the surface of a fast-moving object and detects scattered light from defects on the surface with a sensitive photodetector in a dark-field configuration. The inspector's ability to perform ultrafast dark-field surface inspection enables real-time identification of difficult-to-detect features on weakly reflecting surfaces and hence renders the method much more practical than in the previously demonstrated bright-field configuration. Consequently, our inspector provides nearly 1000 times higher scanning speed than conventional inspectors. To show our method's broad utility, we demonstrate real-time inspection of the surface of various objects (a non-reflective black film, transparent flexible film, and reflective hard disk) for detection of 10??m or smaller defects on a moving target at 20?m/s within a scan width of 25?mm at a scan rate of 90.9?MHz. Our method holds promise for improving the cost and performance of organic light-emitting diode displays for next-generation smart phones, lithium-ion batteries for green electronics, and high-efficiency solar cells.

Yazaki, Akio [Department of Electrical Engineering, University of California, Los Angeles, California 90095 (United States); Yokohama Research Laboratory, Hitachi, Ltd., Kanagawa 244-0817 (Japan); Kim, Chanju [Department of Electrical Engineering, University of California, Los Angeles, California 90095 (United States); Advanced Photonics Research Institute, Gwangju Institute of Science and Technology, Gwangju 500-712 (Korea, Republic of); Chan, Jacky [Department of Electrical Engineering, University of California, Los Angeles, California 90095 (United States); Mahjoubfar, Ata [Department of Electrical Engineering, University of California, Los Angeles, California 90095 (United States); California NanoSystems Institute, University of California, Los Angeles, California 90095 (United States); Goda, Keisuke, E-mail: goda@chem.s.u-tokyo.ac.jp [Department of Electrical Engineering, University of California, Los Angeles, California 90095 (United States); Department of Chemistry, University of Tokyo, Tokyo 113-0033 (Japan); Watanabe, Masahiro [Yokohama Research Laboratory, Hitachi, Ltd., Kanagawa 244-0817 (Japan); Jalali, Bahram [Department of Electrical Engineering, University of California, Los Angeles, California 90095 (United States); California NanoSystems Institute, University of California, Los Angeles, California 90095 (United States); Department of Bioengineering, University of California, Los Angeles, California 90095 (United States); Department of Surgery, David Geffen School of Medicine, University of California, Los Angeles, California 90095 (United States)

2014-06-23T23:59:59.000Z

375

Reduction of CCD observations obtained with the Fabry-Perot scanning interferometer. II. Additional Procedures  

E-Print Network (OSTI)

We describe a software package used at the Special Astrophysical Observatory of the Russian Academy of Sciences to reduce and analyze the data obtained with the Fabry-Perot scanning interferometer. We already described most of the algorithms employed in our earlier Paper I (Moiseev, 2002). In this paper we focus on extra procedures required in the case of the use of a high-resolution Fabry-Perot interferometer: removal of ghosts and measurement of the velocity dispersion of ionized gas in galactic and extragalactic objects.

A. V. Moiseev; O. V. Egorov

2008-05-15T23:59:59.000Z

376

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

377

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

SciTech Connect

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

378

Study of Interactions Between Microbes and Minerals by Scanning Transmission X-Ray Microscopy (STXM)  

SciTech Connect

Scanning Transmission X-ray Microscopy (STXM) and Transmission Electron Microscopy (TEM) were combined to characterize various samples of geomicrobiological interest down to the nanometer scale. An approach based on energy-filtered imaging was used to examine microbe-mineral interactions and the resulting biominerals, as well as biosignatures in simplified laboratory samples. This approach was then applied to natural samples, including natural biofilms entombed in calcium carbonate precipitates and bioweathered silicates and facilitated location of bacterial cells and provided unique insights about their biogeochemical interactions with minerals at the 30-40 nm scale.

Benzerara, K.; /Paris U., VI-VII, LMCP; Tyliszczak, T.; /LBNL, ALS; Brown, G.E., Jr.; /Stanford U., Geo. Environ. Sci. /SLAC, SSRL

2007-01-03T23:59:59.000Z

379

Extending the scanning angle of a phased array antenna by using a null-space medium  

E-Print Network (OSTI)

By introducing a columnar null-space region as the reference space, we design a radome that can extend the scanning angle of a phased array antenna (PAA) by a predetermined relationship (e.g. a linear relationship between the incident angle and steered output angle can be achieved). After some approximation, we only need two homogeneous materials to construct the proposed radome layer by layer. This kind of medium is called a null-space medium, which has been studied and fabricated for realizing hyper-lenses and some other devices. Numerical simulations verify the performance of our radome.

Sun, F

2014-01-01T23:59:59.000Z

380

Microstructure development in particulate coatings examined with high-resolution cryogenic scanning electron microscopy  

SciTech Connect

The authors used cryogenic scanning electron microscopy to examine the early stages of latex film formation. They visualized the influence of ionic strength and extent of carboxylation in latex-calcium carbonate formulations and in latex-only formulations. Results demonstrated that latex particles deposited on calcium carbonate surfaces creating a suspension of carboxylic acid-stabilized calcium carbonate particles. Images of consolidation fronts showed that variation of ionic strength and extent of carboxylation dramatically changes the way latex particles consolidate and form films.

Sheehan, J.G.; Davis, H.T.; Scriven, L.E. [Univ. of Minnesota, Minneapolis, MN (United States); Takamura, Koichi [BASF Corp., Charlotte, NC (United States)

1993-12-01T23:59:59.000Z

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.


381

Acquisition and reconstruction of brain tissue using knife-edge scanning microscopy  

E-Print Network (OSTI)

. As the sample passes under an individual photon receptor, the light intensity value is summed and passed to the next register. The final output pixel is the sum of the light intensity received by all TDI registers for a single sampled point... wide line is imaged along the leading edge of the knife. Our primary camera of choice is a DALSA CT-F3 High- Speed TDI Line Scan Camera. In order to get a high sensitivity at the speed at which we want to cut, the monochrome camera uses Time Delay...

Mayerich, David Matthew

2004-09-30T23:59:59.000Z

382

Real-time monitoring of quorum sensing in 3D-printed bacterial aggregates using scanning electrochemical microscopy  

Science Journals Connector (OSTI)

...manipulating small populations. Micro-3D printing is a lithographic technique capable...cells or small populations. This 3D-printing strategy can organize bacteria...behaviors. Here, we combined micro-3D printing and scanning electrochemical...

Jodi L. Connell; Jiyeon Kim; Jason B. Shear; Allen J. Bard; Marvin Whiteley

2014-01-01T23:59:59.000Z

383

A high-stability scanning tunneling microscope achieved by an isolated tiny scanner with low voltage imaging capability  

SciTech Connect

We present a novel homebuilt scanning tunneling microscope (STM) with high quality atomic resolution. It is equipped with a small but powerful GeckoDrive piezoelectric motor which drives a miniature and detachable scanning part to implement coarse approach. The scanning part is a tiny piezoelectric tube scanner (industry type: PZT-8, whose d{sub 31} coefficient is one of the lowest) housed in a slightly bigger polished sapphire tube, which is riding on and spring clamped against the knife edges of a tungsten slot. The STM so constructed shows low back-lashing and drifting and high repeatability and immunity to external vibrations. These are confirmed by its low imaging voltages, low distortions in the spiral scanned images, and high atomic resolution quality even when the STM is placed on the ground of the fifth floor without any external or internal vibration isolation devices.

Wang, Qi; Wang, Junting; Lu, Qingyou, E-mail: qxl@ustc.edu.cn [High Magnetic Field Laboratory, Chinese Academy of Sciences and University of Science and Technology of China, Hefei, Anhui 230026 (China) [High Magnetic Field Laboratory, Chinese Academy of Sciences and University of Science and Technology of China, Hefei, Anhui 230026 (China); Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, Anhui 230026 (China); Hou, Yubin [High Magnetic Field Laboratory, Chinese Academy of Sciences and University of Science and Technology of China, Hefei, Anhui 230026 (China)] [High Magnetic Field Laboratory, Chinese Academy of Sciences and University of Science and Technology of China, Hefei, Anhui 230026 (China)

2013-11-15T23:59:59.000Z

384

Particle analysis for a strengthened safeguards system: Use of a scanning electron microscope equipped with EDXRF and WDXRF spectrometers  

Science Journals Connector (OSTI)

The purpose of this study was twofold: the identification of some uranium compounds and a measurement of mixed U/Pu particles with different ratios of these elements. We used a Philips XL-30 scanning electron ...

A. Ciurapinski; J. Parus; D. Donohue

2002-03-01T23:59:59.000Z

385

Development of a Versatile in Vitro Platform for Studying Biological Systems Using Micro-3D Printing and Scanning Electrochemical Microscopy  

Science Journals Connector (OSTI)

We report a novel strategy for studying a broad range of cellular behaviors in real time by combining two powerful analytical techniques, micro-3D printing and scanning electrochemical microscopy (SECM). This allows one, in microbiological studies, to ...

Jiyeon Kim; Jodi L. Connell; Marvin Whiteley; Allen J. Bard

2014-11-17T23:59:59.000Z

386

A flexible, highly stable electrochemical scanning probe microscope for nanoscale studies at the solid-liquid interface  

E-Print Network (OSTI)

low-noise measurements in ambient, in situ, and electrochemical environments. II. DESIGNA flexible, highly stable electrochemical scanning probe microscope for nanoscale studies at the solid-liquid interface, specifically in electrolyte environments. Quantification of system noise limits

Gimzewski, James

387

Single-band and Dual-band Beam Switching Systems and Offset-fed Beam Scanning Reflectarray  

E-Print Network (OSTI)

The reflectarray has been considered as a suitable candidate to replace the conventional parabolic reflectors because of its high-gain, low profile, and beam reconfiguration capability. Beam scanning capability and multi-band operation...

Lee, Jungkyu

2012-07-16T23:59:59.000Z

388

Compact scanning soft-x-ray microscope using a laser-produced plasma source and normal-incidence multilayer mirrors  

Science Journals Connector (OSTI)

We have constructed a scanning soft-x-ray microscope that uses a laser-produced plasma as the soft-x-ray source and normal-incidence multilayer-coated mirrors in a Schwarzschild...

Trail, J A; Byer, R L

1989-01-01T23:59:59.000Z

389

Near-field microscopy with a scanning nitrogen-vacancy color center in a diamond nanocrystal: A brief review  

E-Print Network (OSTI)

We review our recent developments of near-field scanning optical microscopy (NSOM) that uses an active tip made of a single fluorescent nanodiamond (ND) grafted onto the apex of a substrate fiber tip. The ND hosting a limited number of nitrogen-vacancy (NV) color centers, such a tip is a scanning quantum source of light. The method for preparing the ND-based tips and their basic properties are summarized. Then we discuss theoretically the concept of spatial resolution that is achievable in this special NSOM configuration and find it to be only limited by the scan height over the imaged system, in contrast with the standard aperture-tip NSOM whose resolution depends critically on both the scan height and aperture diameter. Finally, we describe a scheme we have introduced recently for high-resolution imaging of nanoplasmonic structures with ND-based tips that is capable of approaching the ultimate resolution anticipated by theory.

Drezet, A; Cuche, A; Mollet, O; Berthel, M; Huant, S

2015-01-01T23:59:59.000Z

390

Speed-of-light effects in high-resolution long-cavity fiber Fabry–Perot scanning interferometers  

Science Journals Connector (OSTI)

High-resolution fiber Fabry–Perot scanning interferometers demonstrate bandwidths from 20 MHz to 4 kHz with corresponding cavity lengths from 26 mm to 500 m. Finite speed-of-light...

Hsu, Kevin; Miller, Calvin M; Miller, Jeff W

1993-01-01T23:59:59.000Z

391

A near-field scanning microwave microscope based on a superconducting resonator for low power measurements  

E-Print Network (OSTI)

We report on the design and performance of a cryogenic (300 mK) near-field scanning microwave microscope. It uses a microwave resonator as the near-field sensor, operating at a frequency of 6 GHz and microwave probing amplitudes down to 100 uV, approaching low enough photon population (N~1000) of the resonator such that coherent quantum manipulation becomes feasible. The resonator is made out of a miniaturized distributed fractal superconducting circuit that is integrated with the probing tip, micromachined to be compact enough such that it can be mounted directly on a quartz tuning-fork, and used for parallel operation as an atomic force microscope (AFM). The resonator is magnetically coupled to a transmission line for readout, and to achieve enhanced sensitivity we employ a Pound-Drever-Hall measurement scheme to lock to the resonance frequency. We achieve a well localized near-field around the tip such that the microwave resolution is comparable to the AFM resolution, and a capacitive sensitivity down to 6.4x10^-20 F/rtHz, limited by mechanical noise. We believe that the results presented here are a significant step towards probing quantum systems at the nanoscale using near-field scanning microwave microscopy.

S. E. de Graaf; A. V. Danilov; A. Adamyan; S. E. Kubatkin

2014-04-02T23:59:59.000Z

392

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

SciTech Connect

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

393

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.

,

2012-01-01T23:59:59.000Z

394

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

395

Low cost, large area silicon detectors for calorimetry  

SciTech Connect

Trapezoidal detectors with 28 cm{sup 2} active area have been fabricated on >2500 {Omega}cm, 4 in. diameter n-type silicon wafers. Instead of the commonly used ion implantation method, low-cost, high volume solid state diffusion technology along with phosphosilicate-glass and TCA gettering was adopted for boron and phosphorus doping. Typically the diode dark current was 15 {mu}A {at} 100 volts. Efforts are being made to obtain a finished device yield of 80% to meet the $2/cm{sup 2} price goal of SSC semiconductor detector group. 20 refs., 4 figs.

Korde, R. (International Radiation Detectors, Torrance, CA (USA)); Furuno, K.; Hwang, H.; Brau, J.E. (Oregon Univ., Eugene, OR (USA)); Bugg, W.M. (Tennessee Univ., Knoxville, TN (USA))

1990-01-01T23:59:59.000Z

396

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.

397

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.

398

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.

399

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

400

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.

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

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.

402

Laser-Ranging Long Baseline Differential Atom Interferometers for Space  

E-Print Network (OSTI)

High sensitivity differential atom interferometers are promising for precision measurements in science frontiers in space, including gravity field mapping for Earth science studies and gravitational wave detection. We propose a new configuration of twin atom interferometers connected by a laser ranging interferometer (LRI-AI) to provide precise information of the displacements between the two AI reference mirrors and a means to phase-lock the two independent interferometer lasers over long distances, thereby further enhancing the feasibility of long baseline differential atom interferometers. We show that a properly implemented LRI-AI can achieve equivalent functionality to the conventional differential atom interferometer measurement system. LRI-AI isolates the laser requirements for atom interferometers and for optical phase readout between distant locations, thus enabling optimized allocation of available laser power within a limited physical size and resource budget. A unique aspect of LRI-AI also enables...

Chiow, Sheng-wey; Yu, Nan

2015-01-01T23:59:59.000Z

403

An Adaptive Unified Differential Evolution Algorithm for Global Optimization  

SciTech Connect

In this paper, we propose a new adaptive unified differential evolution algorithm for single-objective global optimization. Instead of the multiple mutation strate- gies proposed in conventional differential evolution algorithms, this algorithm employs a single equation unifying multiple strategies into one expression. It has the virtue of mathematical simplicity and also provides users the flexibility for broader exploration of the space of mutation operators. By making all control parameters in the proposed algorithm self-adaptively evolve during the process of optimization, it frees the application users from the burden of choosing appro- priate control parameters and also improves the performance of the algorithm. In numerical tests using thirteen basic unimodal and multimodal functions, the proposed adaptive unified algorithm shows promising performance in compari- son to several conventional differential evolution algorithms.

Qiang, Ji; Mitchell, Chad

2014-11-03T23:59:59.000Z

404

Symmetries of Differential equations and Applications in Relativistic Physics  

E-Print Network (OSTI)

In this thesis, we study the one parameter point transformations which leave invariant the differential equations. In particular we study the Lie and the Noether point symmetries of second order differential equations. We establish a new geometric method which relates the point symmetries of the differential equations with the collineations of the underlying manifold where the motion occurs. This geometric method is applied in order the two and three dimensional Newtonian dynamical systems to be classified in relation to the point symmetries; to generalize the Newtonian Kepler-Ermakov system in Riemannian spaces; to study the symmetries between classical and quantum systems and to investigate the geometric origin of the Type II hidden symmetries for the homogeneous heat equation and for the Laplace equation in Riemannian spaces. At last but not least, we apply this geometric approach in order to determine the dark energy models by use the Noether symmetries as a geometric criterion in modified theories of gra...

Paliathanasis, Andronikos

2015-01-01T23:59:59.000Z

405

Differentiating surface and bulk interactions in nanoplasmonic interferometric sensor arrays  

E-Print Network (OSTI)

Detecting specific target analytes and differentiating them from interfering background effects is a crucial but challenging task in complex multi-component solutions commonly encountered in environmental, chemical, biological, and medical sensing applications. Here we present a simple nanoplasmonic interferometric sensor platform that can differentiate the adsorption of a thin protein layer on the sensor surface (surface effects) from bulk refractive index changes (interfering background effects) at a single sensing spot, exploiting the different penetration depths of multiple propagating surface plasmon polaritons excited in the ring-hole nanostructures. A monolayer of bovine serum albumin (BSA) molecules with an effective thickness of 1.91nm is detected and differentiated from a 10-3 change in the bulk refractive index unit of the solution. The noise level of the retrieved real-time sensor output compares favorably with traditional prism-based surface plasmon resonance sensors, but is achieved using a sign...

Zeng, Beibei; Bartoli, Filbert J

2014-01-01T23:59:59.000Z

406

Artificial Neural Networks for Solving Ordinary and Partial Differential Equations  

E-Print Network (OSTI)

We present a method to solve initial and boundary value problems using artificial neural networks. A trial solution of the differential equation is written as a sum of two parts. The first part satisfies the boundary (or initial) conditions and contains no adjustable parameters. The second part is constructed so as not to affect the boundary conditions. This part involves a feedforward neural network, containing adjustable parameters (the weights). Hence by construction the boundary conditions are satisfied and the network is trained to satisfy the differential equation. The applicability of this approach ranges from single ODE's, to systems of coupled ODE's and also to PDE's. In this article we illustrate the method by solving a variety of model problems and present comparisons with finite elements for several cases of partial differential equations.

I. E. Lagaris; A. Likas; D. I. Fotiadis

1997-05-19T23:59:59.000Z

407

Differential-ground-motion array at Hollister Municipal Airport, California  

SciTech Connect

This report describes the differential array of seismometers recently installed at the Hollister, California, Municipal Airport. Such an array of relatively closely spaced seismometers has already been installed in El Centro and provided useful information for both engineering and seismological applications from the 1979 Imperial Valley earthquake. Differential ground motions, principally due to horizontally propagating surface waves, are important in determining the stresses in such extended structures as large mat foundations for nuclear power stations, dams, bridges and pipelines. Further, analyses of the records of the 1979 Imperial Valley earthquake from the differential array have demonstrated the utility of short-baseline array data in tracking the progress of the rupture wave front of an earthquake. 5 refs., 4 figs.

Bycroft, G.N.

1983-01-01T23:59:59.000Z

408

Gravito-inertial modes in a differentially rotating spherical shell  

E-Print Network (OSTI)

While many intermediate- and high-mass main sequence stars are rapidly and differentially rotating, the effects of rotation on oscillation modes are poorly known. In this communication we present a first study of axisymmetric gravito-inertial modes in the radiative zone of a differentially rotating star. We consider a simplified model where the radiative zone of the star is a linearly stratified rotating fluid within a spherical shell, with differential rotation due to baroclinic effects. We solve the eigenvalue problem with high-resolution spectral computations and determine the propagation domain of the waves through the theory of characteristics. We explore the propagation properties of two kinds of modes: those that can propagate in the entire shell and those that are restricted to a subdomain. Some of the modes that we find concentrate kinetic energy around short-period shear layers known as attractors. We describe various geometries for the propagation domains, conditioning the surface visibility of the...

Mirouh, Giovanni M; Rieutord, Michel; Ballot, Jérôme

2014-01-01T23:59:59.000Z

409

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

410

Imaging the p-n junction in a gallium nitride nanowire with a scanning microwave microscope  

SciTech Connect

We used a broadband, atomic-force-microscope-based, scanning microwave microscope (SMM) to probe the axial dependence of the charge depletion in a p-n junction within a gallium nitride nanowire (NW). SMM enables the visualization of the p-n junction location without the need to make patterned electrical contacts to the NW. Spatially resolved measurements of S{sub 11}{sup ?}, which is the derivative of the RF reflection coefficient S{sub 11} with respect to voltage, varied strongly when probing axially along the NW and across the p-n junction. The axial variation in S{sub 11}{sup ?}? effectively mapped the asymmetric depletion arising from the doping concentrations on either side of the junction. Furthermore, variation of the probe tip voltage altered the apparent extent of features associated with the p-n junction in S{sub 11}{sup ?} images.

Imtiaz, Atif [Physical Measurement Laboratory, National Institute of Standards and Technology, Boulder, Colorado 80305 (United States); Department of Electrical, Computer, and Energy Engineering, University of Colorado, Boulder, Colorado 80309 (United States); Wallis, Thomas M.; Brubaker, Matt D.; Blanchard, Paul T.; Bertness, Kris A.; Sanford, Norman A.; Kabos, Pavel, E-mail: kabos@boulder.nist.gov [Physical Measurement Laboratory, National Institute of Standards and Technology, Boulder, Colorado 80305 (United States); Weber, Joel C. [Physical Measurement Laboratory, National Institute of Standards and Technology, Boulder, Colorado 80305 (United States); Department of Mechanical Engineering, University of Colorado, Boulder, Colorado 80309 (United States); Coakley, Kevin J. [Information Technology Laboratory, National Institute of Standards and Technology, Boulder, Colorado 80305 (United States)

2014-06-30T23:59:59.000Z

411

Imaging and microanalysis of thin ionomer layers by scanning transmission electron microscopy  

SciTech Connect

Improved conditions for imaging and spectroscopic mapping of thin perfluorosulfonic acid (PFSA) ionomer layers in fuel cell electrodes by scanning transmission electron microscopy (STEM) have been investigated. These conditions are first identified on model systems of Nafion ionomer-coated nanostructured thin films and nanoporous Si. The optimized conditions are then applied in a quantitative study of the ionomer through-layer loading for two typical electrode catalyst coatings using electron energy loss and energy dispersive X-ray spectroscopy in the transmission electron microscope. The e-beam induced damage to the perfluorosulfonic acid (PFSA) ionomer is quantified by following the fluorine mass loss with electron exposure and is then mitigated by a few orders of magnitude using cryogenic specimen cooling and a higher incident electron voltage. Multivariate statistical analysis is also applied to the analysis of spectrum images for data denoising and unbiased separation of independent components related to the catalyst, ionomer, and support.

Cullen, David A [ORNL; Koestner, Roland [General Motors Corporation; Kukreja, Ratan [General Motors Corporation; Minko, Sergiy [Clarkson University, Potsdam, NY; Trotsenko, Oleksandr [Clarkson University, Potsdam, NY; Tokarev, Alexander V [ORNL; Guetaz, Laure [French Atomic Energy Commission (CEA), Grenoble; Meyer III, Harry M [ORNL; Parish, Chad M [ORNL; More, Karren Leslie [ORNL

2014-01-01T23:59:59.000Z

412

Difference of operation mechanisms in SWNTs network FETs studied via scanning gate microscopy  

SciTech Connect

Field effect transistors (FETs) whose channel is composed of a network of single wall carbon nanotubes (SWNTs) have been studied to investigate the mechanism of the device operation via scanning gate microscopy (SGM) at room temperature. We observed different SGM response in networks of SWNTs either synthesized by CoMoCAT process or semiconducting enriched by density gradient ultracentrifuge process. In the former case, SGM response was observed at specific inter-tube junctions suggesting a Schottky junction formed with semiconducting and metallic SWNTs in the network. In contrast, multiple concentric rings in the SGM response are observed within the tubes in a network of the latter SWNTs suggesting a possibility of quantum mechanical transport at room-temperature. Different type of SGM responses are confirmed in the two kinds of SWNTs networks, nevertheless such active positions would likely have an important role in the FET operation mechanism in each network.

Wei, Xiaojun; Matsunaga, Masahiro; Yahagi, Tatsurou; Maeda, Kenji; Ochiai, Yuichi; Aoki, Nobuyuki [Graduate School of Advanced Integration Science, Chiba University, Chiba 263-8522 (Japan); Bird, Jonathan P. [Department of Electrical Engineering, University at Buffalo, the State University of New York, Buffalo, NY 14260-1920 (United States); Ishibashi, Koji [Advanced Device Laboratory, RIKEN, Wako, Saitama 351-0198 (Japan)

2013-12-04T23:59:59.000Z

413

Detecting Distributed Scans Using High-Performance Query-DrivenVisualization  

SciTech Connect

Modern forensic analytics applications, like network trafficanalysis, perform high-performance hypothesis testing, knowledgediscovery and data mining on very large datasets. One essential strategyto reduce the time required for these operations is to select only themost relevant data records for a given computation. In this paper, wepresent a set of parallel algorithms that demonstrate how an efficientselection mechanism -- bitmap indexing -- significantly speeds up acommon analysist ask, namely, computing conditional histogram on verylarge datasets. We present a thorough study of the performancecharacteristics of the parallel conditional histogram algorithms. Asacase study, we compute conditional histograms for detecting distributedscans hidden in a dataset consisting of approximately 2.5 billion networkconnection records. We show that these conditional histograms can becomputed on interactive timescale (i.e., in seconds). We also show how toprogressively modify the selection criteria to narrow the analysis andfind the sources of the distributed scans.

Stockinger, Kurt; Bethel, E. Wes; Campbell, Scott; Dart, Eli; Wu,Kesheng

2006-09-01T23:59:59.000Z

414

Scanning Hall Probe Imaging of ErNi2B2C  

SciTech Connect

We report scanning Hall probe imaging of ErNi{sub 2}B{sub 2}C in the superconducting, antiferromagnetic, and weakly ferromagnetic regimes in magnetic fields up to 20 Oe, well below H{sub c1}, with two results. First, imaging isolated vortices shows that they spontaneously rearrange on cooling through the antiferromagnetic transition temperature T{sub N} = 6 K to pin on twin boundaries, forming a striped pattern. Second, a weak, random magnetic signal appears in the ferromagnetic phase below T{sub WFM} = 2.3 K, and no spontaneous vortex lattice is present down to 1.9 K. We conclude that ferromagnetism coexists with superconductivity either by forming small ferromagnetic domains or with oscillatory variation of the magnetization on sub-penetration depth length scales.

Bluhm, Hendrik; Sebastian, Suchitra; Guikema, Janice W.; Fisher, I.R.; Moler, Kathryn A.; /Stanford U., Appl. Phys. Dept.

2005-12-02T23:59:59.000Z

415

Three-Dimensional Aberration-Corrected Scanning Transmission Electron Microscopy for Biology  

SciTech Connect

Recent instrumental developments have enabled greatly improved resolution of scanning transmission electron microscopes (STEM) through aberration correction. An additional and previously unanticipated advantage of aberration correction is the greatly improved depth sensitivity that has led to the reconstruction of a three-dimensional (3D) image from a focal series. In this chapter the potential of aberration-corrected 3D STEM to provide major improvements in the imaging capabilities for biological samples will be discussed. This chapter contains a brief overview ofthe various high-resolution 3D imaging techniques, a historical perspective of the development of STEM, first estimates of the dose-limited axial and lateral resolution on biological samples and initial experiments on stained thin sections.

De Jonge, Niels [ORNL; Sougrat, Rachid [ORNL; Pennycook, Stephen J [ORNL; Peckys, Diana B [ORNL; Lupini, Andrew R [ORNL

2007-01-01T23:59:59.000Z

416

Quantitative determination of local potential values in inhomogeneously doped semiconductors by scanning tunneling microscopy  

Science Journals Connector (OSTI)

Local potential changes arising from nanoscale three-dimensional spatial fluctuations in the dopant distribution in Zn-doped GaAs were investigated quantitatively by scanning tunneling microscopy and spectroscopy at (110) cleavage surfaces. Tunneling spectra measured in areas with different local doping concentration show apparent shifts of the valence band edge and apparent changes of the band gap. A quantitative analysis, combined with band bending and tunnel current simulations, demonstrates that these effects arise from tip-induced band bending that modulates the real potential changes. It is illustrated how exact potential changes between locally high and low doped areas can be determined. It is found that the local potential fluctuations in three-dimensionally doped semiconductors are approximately one order of magnitude smaller that those observed in two-dimensionally doped semiconductors.

P. H. Weidlich, R. E. Dunin-Borkowski, and Ph. Ebert

2011-08-29T23:59:59.000Z

417

Nanoscale chemical imaging using synchrotron x-ray enhanced scanning tunneling microscopy  

SciTech Connect

The combination of synchrotron radiation with scanning tunneling microscopy provides a promising new concept for chemical imaging of nanoscale structures. It employs detection of local x-ray absorption, which directly yields chemical, electronic, and magnetic sensitivity. The study of the tip current in the far field (800 nm tip/sample separation) shows that insulator-coated tips have to be considered in order to reduce the background from stray photoelectron. A picture of the different channels contributing to the x-ray enhanced STM process is proposed. If during electron tunneling the sample is illuminated with monochromatic x-rays, characteristic absorption will arise, and core electrons are excited, which might modulate the conventional tunnel current and facilitate chemical imaging at the nanoscale.

Rose, Volker; Freeland, John W. [Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439 (United States)

2010-06-23T23:59:59.000Z

418

Construction of a Dilution Refrigerator Based Ultra-Low Temperature Scanning Tunneling Microscope  

Science Journals Connector (OSTI)

We constructed a dilution refrigerator based ultra-low temperature scanning tunneling microscope (ULT-STM) which works at temperatures down to 20 mK, in magnetic fields up to 6 T and in ultrahigh vacuum (UHV). One can load samples/tips, which are prepared in a UHV chamber, to an STM head maintaining the low temperature and UHV conditions. After then they can be cooled back to the base temperature in several hours. We report results of a test measurement on a superconducting NbSe2 sample as well as recent STM/STS studies on graphite samples such as observations of the Landau quantization and visualization of the possible localized states in magnetic fields.

Hiroshi Kambara; Tomohiro Matsui; Yasuhiro Niimi; Hiroshi Fukuyama

2006-01-01T23:59:59.000Z

419

A simple scanning spectrometer based on a stretchable elastomeric reflective grating  

SciTech Connect

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

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

2014-02-10T23:59:59.000Z

420

Modeling and characterization of a cantilever-based near-field scanning microwave impedance microscope  

Science Journals Connector (OSTI)

This paper presents a detailed modeling and characterization of a microfabricated cantilever-based scanning microwave probe with separated excitation and sensing electrodes. Using finite-element analysis we model the tip-sample interaction as small impedance changes between the tip electrode and the ground at our working frequencies near 1 GHz . The equivalent lumped elements of the cantilever can be determined by transmission line simulation of the matching network which routes the cantilever signals to 50 ? feed lines. In the microwave electronics the background common-mode signal is canceled before the amplifier stage so that high sensitivity (below 1 aF capacitance changes) is obtained. Experimental characterization of the microwavemicroscope was performed on ion-implanted Si wafers and patterned semiconductor samples. Pure electrical or topographical signals can be obtained from different reflection modes of the probe.

K. Lai; W. Kundhikanjana; M. Kelly; Z. X. Shen

2008-01-01T23:59:59.000Z

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.


421

Widely tuneable scattering-type scanning near-field optical microscopy using pulsed quantum cascade lasers  

SciTech Connect

We demonstrate the use of a pulsed quantum cascade laser, wavelength tuneable between 6 and 10??m, with a scattering-type scanning near-field optical microscope (s-SNOM). A simple method for calculating the signal-to-noise ratio (SNR) of the s-SNOM measurement is presented. For pulsed lasers, the SNR is shown to be highly dependent on the degree of synchronization between the laser pulse and the sampling circuitry; in measurements on a gold sample, the SNR is 26 with good synchronization and less than 1 without. Simulations and experimental s-SNOM images, with a resolution of 100?nm, corresponding to ?/80, and an acquisition time of less than 90 s, are presented as proof of concept. They show the change in the field profile of plasmon-resonant broadband antennas when they are excited with wavelengths of 7.9 and 9.5??m.

Yoxall, Edward, E-mail: edward.yoxall@imperial.ac.uk; Rahmani, Mohsen; Maier, Stefan A.; Phillips, Chris C. [The Blackett Laboratory, Department of Physics, Imperial College London, London SW7 2AZ (United Kingdom)] [The Blackett Laboratory, Department of Physics, Imperial College London, London SW7 2AZ (United Kingdom); Navarro-Cía, Miguel [Optical and Semiconductor Devices Group, Department of Electrical and Electronic Engineering, Imperial College London, London SW7 2BT (United Kingdom)] [Optical and Semiconductor Devices Group, Department of Electrical and Electronic Engineering, Imperial College London, London SW7 2BT (United Kingdom)

2013-11-18T23:59:59.000Z

422

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

423

Development of a combined interference microscope objective and scanning probe microscope  

Science Journals Connector (OSTI)

A compact sensor head combining optical interference and scanning probe microscopy in a single instrument has been developed. This instrument is able to perform complementary quantitative measurements combining fast nondestructive three-dimensional surface analysis with high lateral resolution imaging. A custom interference microscopesensor head has been designed as the optical microscope objective and integrated within the architecture of a commercial interference microscope. The combined instrument makes available both the acquisition software and the hardware interface of the commercial microscope. The latter is able to function as a phase-shift interferometer or white light interferometer. Furthermore the use of an optical fiber to transmit light from an external laser: (i) removes a major heat source from the measurement environment and (ii) makes aperture correction unnecessary. The lateral resolution of the instrument has been extended by the addition of a previously developed compact scanning probe microscope(SPM) module to the custom interference microscope objective. This SPM unit is based upon piezoresistive cantilever technology. The “piezolevers” are self-sensing and therefore require no additional systems such as optical beam deflection or fiber interferometry to monitor their displacement. The mechanical simplicity of the piezolever SPM unit allows for a small physical size and can thus be added to the custom optical sensor head without violating constraints on the working distance defined by the optics. A major benefit of the system in terms of a quantitative nanometrology is the possibility to perform a traceable and direct calibration of the SPM module. This calibration is achieved practically by measuring an appropriate sample at a common location using both techniques. Results are presented here for the measurement of two calibration standards and a test sample to demonstrate the increased lateral resolution of the instrument.

James W. G. Tyrrell; Claudio Dal Savio; Rolf Krüger-Sehm; Hans-Ulrich Danzebrink

2004-01-01T23:59:59.000Z

424

Total Measurement Uncertainty for the Plutonium Finishing Plant (PFP) Segmented Gamma Scan Assay System  

SciTech Connect

This report presents the results of an evaluation of the Total Measurement Uncertainty (TMU) for the Canberra manufactured Segmented Gamma Scanner Assay System (SGSAS) as employed at the Hanford Plutonium Finishing Plant (PFP). In this document, TMU embodies the combined uncertainties due to all of the individual random and systematic sources of measurement uncertainty. It includes uncertainties arising from corrections and factors applied to the analysis of transuranic waste to compensate for inhomogeneities and interferences from the waste matrix and radioactive components. These include uncertainty components for any assumptions contained in the calibration of the system or computation of the data. Uncertainties are propagated at 1 sigma. The final total measurement uncertainty value is reported at the 95% confidence level. The SGSAS is a gamma assay system that is used to assay plutonium and uranium waste. The SGSAS system can be used in a stand-alone mode to perform the NDA characterization of a container, particularly for low to medium density (0-2.5 g/cc) container matrices. The SGSAS system provides a full gamma characterization of the container content. This document is an edited version of the Rocky Flats TMU Report for the Can Scan Segment Gamma Scanners, which are in use for the plutonium residues projects at the Rocky Flats plant. The can scan segmented gamma scanners at Rocky Flats are the same design as the PFP SGSAS system and use the same software (with the exception of the plutonium isotopics software). Therefore, all performance characteristics are expected to be similar. Modifications in this document reflect minor differences in the system configuration, container packaging, calibration technique, etc. These results are supported by the Quality Assurance Objective (QAO) counts, safeguards test data, calibration data, etc. for the PFP SGSAS system. Other parts of the TMU analysis utilize various modeling techniques such as Monte Carlo N-Particle (MCNP) and In Situ Object Counting Software (ISOCS).

WESTSIK, G.A.

2001-06-06T23:59:59.000Z

425

Differentially Flat Trajectory Generation for a Dynamically Stable Mobile Robot  

E-Print Network (OSTI)

for the ballbot, a dynamically stable mobile robot which balances on a single spherical wheel. To this end, assumptions are made to form the system as differentially flat, and a method of deriving feasible trajectories, dynamically stable mobile robot. It is a human-sized robot that balances on a single spherical wheel

426

Theoretical Investigation of a Gearless Differential Gentcho Stainov  

E-Print Network (OSTI)

kinematics chain between the two wheels trough the ground. Depending on the cohesion of the wheels of the moment during the operation of the differential; Fab force on the ball from the wall of the groove; Fa force on the ball from the wall of the groove of the disk a, connected to output ; Fb force on the ball

Borissova, Daniela

427

Design and Implementation of an Electric Differential for Traction Application  

E-Print Network (OSTI)

and transmissions with lighter and smaller electric motors directly coupled to the wheels via a single gear or an in-wheel motor. This paper deals then with an Electric Differential System (EDS) for an Electric Vehicle (EV angle with good static and dynamic performances. Index Terms--Electric Vehicle (EV), induction motor

Paris-Sud XI, Université de

428

Support Vector Machines for Differential Finn Kuusisto1  

E-Print Network (OSTI)

Support Vector Machines for Differential Prediction Finn Kuusisto1 , Vitor Santos Costa2 , Houssam, Madison, WI, USA 2 University of Porto, Porto, Portugal 3 Amazon, Seattle, WA, USA Abstract. Machine medical applications and show excellent results. Keywords: support vector machine, uplift modeling 1

Page Jr., C. David

429

A Practical Application of Differential Privacy to Personalized Online Advertising  

E-Print Network (OSTI)

A Practical Application of Differential Privacy to Personalized Online Advertising Yehuda Lindell@cs.biu.ac.il,omrier@gmail.com Abstract Online advertising plays an important role in supporting many Internet services. Person- alized online advertising offers marketers a way to direct ads at very specific audiences. The vast body

430

Distributional Differential Privacy for Large-Scale Smart Mrk Jelasity  

E-Print Network (OSTI)

, a natural requirement in the smart grid. We propose novel differentially private mechanisms that solve this problem for sum queries. We evaluate our methods and assumptions using a theoretical analysis as well as publicly available measurement data and show that the extra noise needed to protect distribution parameters

Jelasity, Márk

431

Differentiated Strategies for Replicating Web Documents Guillaume Pierre  

E-Print Network (OSTI)

Differentiated Strategies for Replicating Web Documents Guillaume Pierre Ihor Kuz Maarten van.U. Delft, Zuidplantsoen 4, P.O. Box 356, 2628 BZ Delft, The Netherlands. Abstract Replicating Web documents have been proposed to manage such replication while keeping the document copies consistent. We claim

Pâris, Jehan-François

432

On the Consequences of Eliminating Capital Tax Differentials  

E-Print Network (OSTI)

to eliminate these differentials. This paper analyzes the consequences of such a reform using an incomplete markets model with equipment-skill complementarity. We find that the reform increases average welfare by approximately 0.1%. Importantly, we find that the reform does not involve the usual efficiency vs. equality

Yanikoglu, Berrin

433

Differentiability properties of Rank Linear Utilities G. Carlier  

E-Print Network (OSTI)

Differentiability properties of Rank Linear Utilities G. Carlier April 8, 2006 Abstract We study generalize the rank dependent expected utility and are called rank-linear utilities in deci- sion theory results generalize those obtained for the rank dependent expected utility in [1]. The author wishes

Carlier, Guillaume

434

Behavioral/Systems/Cognitive Differential Dopaminergic Modulation of Neostriatal  

E-Print Network (OSTI)

-specific expression of D1aR in striatonigral and D2R in striatopallidal neurons and the differential expression and Plenz, 2002; Tunstall et al., 2002; Guzma´n et al., 2003; Koos et al., 2004; Taverna et al., 2008 interest, collateral synapses of SPNs have been shown to be strongly modulated by dopamine (Guzma´n et al

Tepper, James M.

435

Differential Turbo Coded Modulation with APP Channel Estimation  

E-Print Network (OSTI)

Differential Turbo Coded Modulation with APP Channel Estimation Sheryl L. Howard and Christian, iterative decoding. I. INTRODUCTION With the advent of turbo codes [1], [2] and iterative de- coding in very high noise/low signal- to-noise ratio (SNR) environments. Turbo trellis coded modulation (TTCM

Howard, Sheryl

436

Differential phase contrast X-ray imaging system and components  

DOE Patents (OSTI)

A differential phase contrast X-ray imaging system includes an X-ray illumination system, a beam splitter arranged in an optical path of the X-ray illumination system, and a detection system arranged in an optical path to detect X-rays after passing through the beam splitter.

Stutman, Daniel; Finkenthal, Michael

2014-07-01T23:59:59.000Z

437

Cyclophosphamide Induces Differentiation of Th17 Cells in Cancer Patients  

Science Journals Connector (OSTI)

...determination of differentiating CD4+ T cells.Immunity 2009;30:155-67. 12. Yang XO , Nurieva R, Martinez GJ, Kang HS, Chung Y, Pappu BP, et alMolecular antagonism and plasticity of regulatory and inflammatory T cell programs.Immunity...

Sophie Viaud; Caroline Flament; Mustapha Zoubir; Patricia Pautier; Axel LeCesne; Vincent Ribrag; Jean-Charles Soria; Virginie Marty; Philippe Vielh; Caroline Robert; Nathalie Chaput; and Laurence Zitvogel

438

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

439

Polymorphism, Phase Transitions, and Thermal Stability of l-Pyroglutamic Acid  

Science Journals Connector (OSTI)

The sequence of polymorphic transformations was studied by Raman spectroscopy, powder X-ray diffraction, differential scanning calorimetry, and hot stage microscopy. ... (6) It plays an important role in the preservation and activity of the key neurotransmitters acetylcholine, gamma-aminobutyric acid (GABA) and Glu;(6-8) it readily passes the blood?brain barrier to stimulate cognitive-enhancing function in rats(9) and reduce age-associated memory decline in humans. ... On cooling, the ?/?? exotherm has sawtooth character, Figure 2d inset, which may indicate that the transition occurs in bursts, typical of a martensitic transition. ...

Han Wu; Nik Reeves-McLaren; Jan Pokorny; Jack Yarwood; Anthony R. West

2010-06-18T23:59:59.000Z

440

Calorimetric analysis of fungal degraded wood  

SciTech Connect

Endothermic transition and gross heat of combustion of aspenwood subjected to degradation by Lenzites trabea and Polyporus versicolor were determined by using differential scanning calorimetry (DSC) and an adiabatic O bomb. Endothermic peak areas of undegraded and fungi-degraded wood differed from each other at all levels of weight loss. The regression analysis of the DSC data vs. weight loss revealed a significant relations, although not highly correlated, for P. versicolor-degraded specimens and a nonsignificant relation for L. trabea-degraded specimens; weight loss and gross heat of combustion values of degraded specimens were significantly correlated.

Blankenhorn, P.R.; Baldwin, R.C.; Merrill, W. Jr.; Ottone, S.P.

1980-01-01T23:59:59.000Z

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.


441

Recyclable Diels–Alder Furan/Maleimide Polymer Networks with Shape Memory Effect  

Science Journals Connector (OSTI)

The Diels–Alder and retro-Diels–Alder reactions between PHAEs and MPDBMI were confirmed by Fourier transform infrared, differential scanning calorimetry (DSC), and solubility test. ... Furthermore, the mechanical properties and shape memory properties of the original and recycled MPDBMI/PHAE networks were systematically investigated by a tensile test and a quantitative shape memory evaluation method, respectively. ... DSC measurement indicated that the retro-Diels–Alder reaction will occur upon heating, and the solubility test showed that the recycled MPDBMI/PHAE films may still be considered as recyclable. ...

Mengjin Fan; Jialin Liu; Xiangyuan Li; Junying Zhang; Jue Cheng

2014-09-26T23:59:59.000Z

442

Aqueous sample from B-Plant, Tank 9-1. Revision 1  

SciTech Connect

Eight liquid samples were received from B-Plant Tank 9-1 in four lots of two samples each, for inorganic and organic analysis. This is the final report for the sampling and analysis effort; included are summary tables of the analytical and quality control data as well as all raw data. The analyses include pH, OH, inductively coupled plasma spectrography, ion chromatograph, total organic carbon, total inorganic carbon, and differential scanning calorimetry. Included are copies of the chain of custody and request for special analysis forms.

Bell, K.E.

1995-05-18T23:59:59.000Z

443

Modeling and Characterization of the Magnetocaloric Effect in Ni2MnGa Materials  

SciTech Connect

Magnetic shape memory alloys have great promise as magneto-caloric effect refrigerant materials due to their combined magnetic and structural transitions. Computational and experimental research is reported on the Ni2MnGa material system. The magnetic states of this system are explored using the Wang-Landau statistical approach in conjunction with the Locally Self-consistent Multiple-Scattering method. The effects of alloying agents on the transition temperatures of the Ni2MnGa alloy are investigated using differential scanning calorimetry and superconducting quantum interference device. Experiments are performed at the Spallation Neutron Source at Oak Ridge National Laboratory to observe the structural and magnetic phase transformations.

Nicholson, Don M [ORNL; Odbadrakh, Khorgolkhuu [ORNL; Shassere, Benjamin [ORNL; Rios, Orlando [ORNL; Hodges, Jason P [ORNL; Ludtka, Gerard Michael [ORNL; Porter, Wallace D [ORNL; Safa-Sefat, Athena [ORNL; Rusanu, Aurelian [ORNL; Brown, Greg [ORNL; Evans III, Boyd Mccutchen [ORNL

2014-01-01T23:59:59.000Z

444

iPP Crystallization: Micro and Nano Fillers Effects  

Science Journals Connector (OSTI)

Since the properties of semicrystalline polymers depend on the morphology studies on effect of fillers on the composites crystallization are of great interest. In this work a micrometric talc and a nanoclay are dispersed in a polypropylene matrix and the influence of two different fillers and temperature on the polymer crystallization behavior in quiescent conditions is assessed by means of differential scanning calorimetry (DSC) and rheological characterization through linear viscoelasticity (SAOS) [1]. The DSC tests lead to the half crystallization time depending on overall crystallization rate (i.e. nucleation and growth) whereas by rheological measurement one can deduce also the induction time depending only on nucleation [2].

Emilia Gioffredi; Gabriele Cassulo; Alberto Frache; Pier Luca Maffettone

2010-01-01T23:59:59.000Z

445

Internal Image Potential in Semiconductors - Effect on Scanning-Tunneling-Microscopy  

E-Print Network (OSTI)

10 10 m ~ o 0 ~ 410 g (25) j(s)=, f dE,D(E?s ) [No(E, ) No(E, qV)?], ? @ mp where mo is the free-electron mass, No(E, ) and No(E, ?qV) are one-dimensional finite-temperature sup- ply functions for electrons in the semiconductor and metal... correct only for a square barrier. If we define the cumulative current density as a function of energy according to Ej (E?s) =e J dE,'D(E,', s )[Xo(E,') Ko(E,' q?V)], ?0 (27) 0.2- ?0.2 ?0.6 5x10 cm (s=5k) the diff'erential current density per...

HUANG, ZH; WEIMER, M.; Allen, Roland E.

1993-01-01T23:59:59.000Z

446

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 ________________________________

447

Atomic-Scale Imaging and Spectroscopy for In Situ Liquid Scanning Transmission Electron Microscopy  

SciTech Connect

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

448

Josephson scanning tunneling microscopy -- a local and direct probe of the superconducting order parameter  

SciTech Connect

Direct measurements of the superconducting superfluid on the surface of vacuum-cleaved Bi2Sr2CaCu2O8+delta (BSCCO) samples are reported. These measurements are accomplished via Josephson tunneling into the sample using a novel scanning tunneling microscope (STM) equipped with a superconducting tip. The spatial resolution of the STM of lateral distances less than the superconducting coherence length allows it to reveal local inhomogeneities in the pair wavefunction of the BSCCO. Instrument performance is demonstrated first with Josephson measurements of Pb films followed by the layered superconductor NbSe2. The relevant measurement parameter, the Josephson ICRN product, is discussed within the context of both BCS superconductors and the high transition temperature superconductors. The local relationship between the ICRN product and the quasiparticle density of states (DOS) gap are presented within the context of phase diagrams for BSCCO. Excessive current densities can be produced with these measurements and have been found to alter the local DOS in the BSCCO. Systematic studies of this effect were performed to determine the practical measurement limits for these experiments. Alternative methods for preparation of the BSCCO surface are also discussed.

Kimura, Hikari; Dynes, Robert; Barber Jr., Richard. P.; Ono, S.; Ando, Y.

2009-09-01T23:59:59.000Z

449

Color intensity projections: A rapid approach for evaluating four-dimensional CT scans in treatment planning  

SciTech Connect

Purpose: Four-dimensional computerized tomography scans (4DCT) enable intrafractional motion to be determined. Because more than 1500 images can be generated with each 4DCT study, tools for efficient data visualization and evaluation are needed. We describe the use of color intensity projections (CIP) for visualizing mobility. Methods: Four-dimensional computerized tomography images of each patient slice were combined into a CIP composite image. Pixels largely unchanged over the component images appear unchanged in the CIP image. However, pixels whose intensity changes over the phases of the 4DCT appear in the CIP image as colored pixels, and the hue encodes the percentage of time the tissue was in each location. CIPs of 18 patients were used to study tumor and surrogate markers, namely the diaphragm and an abdominal marker block. Results: Color intensity projections permitted mobility of high-contrast features to be quickly visualized and measured. In three selected expiratory phases ('gating phases') that were reviewed in the sagittal plane, gating would have reduced mean tumor mobility from 6.3 {+-} 2.0 mm to 1.4 {+-} 0.5 mm. Residual tumor mobility in gating phases better correlated with residual mobility of the marker block than that of the diaphragm. Conclusion: CIPs permit immediate visualization of mobility in 4DCT images and simplify the selection of appropriate surrogates for gated radiotherapy.

Cover, Keith S. [Department of Radiation Oncology, VU University Medical Center, Amsterdam (Netherlands); Lagerwaard, Frank J. [Department of Radiation Oncology, VU University Medical Center, Amsterdam (Netherlands); Senan, Suresh [Department of Radiation Oncology, VU University Medical Center, Amsterdam (Netherlands)]. E-mail: s.senan@vumc.nl

2006-03-01T23:59:59.000Z

450

Scanning electron microscopic study of laser-induced morphologic changes of a coated enamel surface  

SciTech Connect

A low-energy Nd:YAG laser was used to irradiate extracted human teeth coated with a black energy-absorbent laser initiator in a study to determine the extent of the morphologic changes produced in the enamel surface. The laser initiator was applied to a cleaned enamel surface and irradiated at an energy output of 30 mJ or 75 mJ. Both energy levels produced morphologic changes of the surface. There was a sharp line of demarcation between the coated, irradiated area and the surrounding noncoated enamel surface. The scanning electron microscope view at the lower energy level showed that the surface had melted and reformed with numerous small, bubble-like inclusions. The 75 mJ energy level showed individual impact craters with shallow centers and raised edges containing numerous pores and large, bubble-like inclusions. Etching is a dental procedure in which an acid is normally used to remove a thin outer layer of the tooth structure. This is necessary to create a roughened, irregular surface in order to provide mechanical retention for dental restorative materials. The changes produced by the laser in this study suggest a simple, effective, and controlled method of etching the enamel surface of a tooth by altering its surface characteristics.

Hess, J.A. (Univ. of Detroit School of Dentistry, MI (USA))

1990-01-01T23:59:59.000Z

451

Scanning tunneling microscopy study of nitrogen incorporated HfO{sub 2}  

SciTech Connect

The impact of nitrogen incorporation on the physical and electrical characteristics of the HfO{sub 2} is examined. X-ray photoelectron spectroscopy shows that nitrogen can be incorporated into the HfO{sub 2} via a two-step thermal anneal--first in ultrahigh vacuum (UHV) and subsequently in N{sub 2}. Following the N{sub 2} anneal, scanning tunneling microscopy in UHV reveals a marked reduction in the low-voltage leakage current under gate injection biasing. From band theory and existing first-principles simulation results, one may consistently attribute this improvement to the passivation of oxygen vacancies in the HfO{sub 2} by nitrogen. Improvement in the breakdown strength of the HfO{sub 2} subjected to ramp-voltage stress (substrate injection) is also observed after the N{sub 2} anneal. The local current-voltage curves acquired concurrently during the ramp-voltage stress exhibit 'space-charge limited conduction', which implies that the observed improvement in breakdown strength may be related to a limitation of the current flow through the gate stack in the high stress voltage regime.

Ong, Y. C.; Ang, D. S.; Pey, K. L.; Li, X. [Nanyang Technological University, School of Electrical and Electronic Engineering, Nanyang Avenue, Singapore 639798 (Singapore); O'Shea, S. J.; Wang, S. J. [Institute of Materials Research and Engineering, A-STAR - Agency for Science, Technology and Research, 3 Research Link, Singapore 11760 (Singapore); Tung, C. H. [Institute of Microelectronics, A-STAR - Agency for Science, Technology and Research, 11 Science Park Road, Singapore Science Park II, Singapore 117685 (Singapore)

2008-09-15T23:59:59.000Z

452

A New Scanning Tunneling Microscope Reactor Used for High Pressure and High Temperature Catalysis Studies  

SciTech Connect

We present the design and performance of a home-built high-pressure and high-temperature reactor equipped with a high-resolution scanning tunneling microscope (STM) for catalytic studies. In this design, the STM body, sample, and tip are placed in a small high pressure reactor ({approx}19 cm{sup 3}) located within an ultrahigh vacuum (UHV) chamber. A sealable port on the wall of the reactor separates the high pressure environment in the reactor from the vacuum environment of the STM chamber and permits sample transfer and tip change in UHV. A combination of a sample transfer arm, wobble stick, and sample load-lock system allows fast transfer of samples and tips between the preparation chamber, high pressure reactor, and ambient environment. This STM reactor can work as a batch or flowing reactor at a pressure range of 10{sup -13} to several bars and a temperature range of 300-700 K. Experiments performed on two samples both in vacuum and in high pressure conditions demonstrate the capability of in situ investigations of heterogeneous catalysis and surface chemistry at atomic resolution at a wide pressure range from UHV to a pressure higher than 1 atm.

Tao, Feng; Tang, David C.; Salmeron, Miquel; Somorjai, Gabor A.

2008-05-12T23:59:59.000Z

453

A near-field scanning microwave microscope based on a superconducting resonator for low power measurements  

E-Print Network (OSTI)

We report on the design and performance of a cryogenic (300 mK) near-field scanning microwave microscope. It uses a microwave resonator as the near-field sensor, operating at a frequency of 6 GHz and microwave probing amplitudes down to 100 uV, approaching low enough photon population (N~1000) of the resonator such that coherent quantum manipulation becomes feasible. The resonator is made out of a miniaturized distributed fractal superconducting circuit that is integrated with the probing tip, micromachined to be compact enough such that it can be mounted directly on a quartz tuning-fork, and used for parallel operation as an atomic force microscope (AFM). The resonator is magnetically coupled to a transmission line for readout, and to achieve enhanced sensitivity we employ a Pound-Drever-Hall measurement scheme to lock to the resonance frequency. We achieve a well localized near-field around the tip such that the microwave resolution is comparable to the AFM resolution, and a capacitive sensitivity down to 6...

de Graaf, S E; Adamyan, A; Kubatkin, S E

2014-01-01T23:59:59.000Z

454

ihLSEVIFR Optical Materials 3 (1994) 115--121 Absolute non-radiative energy conversion efficiency scanning  

E-Print Network (OSTI)

, in optical materials. 1. Introduction reported optical absorptions and optical-to-thermal energy conversion of transparent, high-qual- which PPES 11NR studies have been reported have itylaser materials, ~NR (A) the absence of irre- radiativecenters during the quadrature scan, as corn- producible thermal resistances

Mandelis, Andreas

455

Frustration in the Si(111) ‘‘pseudo 5×5’’ Cu structure directly observed by scanning tunneling microscopy  

Science Journals Connector (OSTI)

Frustration in a surface structure has been observed in real space and time using the scanning tunneling microscope. The frustration is revealed as an instability of an inherent feature in the Si(111) ‘‘pseudo 5×5’’ Cu structure. A possible origin of the frustration is proposed.

K. Mortensen

1991-01-28T23:59:59.000Z

456

A novel off-axis scanning method for an enlarged ellipse cone-beam computed tomography field of view  

SciTech Connect

Purpose: Current on-board imaging systems commonly used by modern linear accelerators (LINACs) have a limited field of view (FOV) for a cone-beam CT (CBCT) scan, which is typically less than 50 cm. Consequently, truncation artifacts often occur for large patients. The goal of this work is to investigate a novel method to increase the FOV for current on-board CBCT systems. Methods: When a large patient is scanned with CBCT, any region outside the FOV is only partially sampled within a short range of projection angles, and at other angles no x-ray beams may pass through that region. To increase the sampling rate for the region outside the FOV, we have designed a new source trajectory by shifting the center of rotation during a CBCT scan. This resulted in a reduced sampling rate at the central area and increased sampling rate at the edges. The tradeoff led to a more balanced sampling for an enlarged FOV. An iterative algorithm was also developed to reconstruct the CT image under the new sampling scheme using a compressed sensing technique. Results: The method was validated by numerical simulations mimicking a Varian Trilogy CBCT system, and it was found that artifact-free images could be obtained with the FOV as large as 80 cm. Conclusions: The new CT scanning trajectory can be easily realized under current clinical setup with little modification of the control system, and this can be useful for treating obese patients.

Li Tianfang; Li Xiang; Yang Yong; Heron, Dwight E.; Huq, M. Saiful. [Department of Radiation Oncology, University of Pittsburgh Cancer Institute, Pittsburgh, Pennsylvania 15232 (United States)

2010-12-15T23:59:59.000Z

457

Magnetic domain structures of focused ion beam-patterned cobalt films using scanning ion microscopy with polarization analysis  

E-Print Network (OSTI)

Magnetic domain structures of focused ion beam-patterned cobalt films using scanning ion microscopy Studies of magnetic domain distributions in patterned magnetic materials are of pivotal importance in the areas of ultrahigh density magnetic recording, MRAM design, and miniaturized magnetic sensor arrays

Rau, Carl

458

Probing nanoscale photo-oxidation in organic films using spatial hole burning near-field scanning optical microscopy  

E-Print Network (OSTI)

Probing nanoscale photo-oxidation in organic films using spatial hole burning near-field scanning from a stationary NSOM tip to induce photo-oxidation. The reduction in the fluorescence yield resulting photo-oxidation as a function of time, position, and environment free from the limits of far

Buratto, Steve

459

Scanning tunneling spectroscopy on crossed carbon nanotubes J. W. Janssen, S. G. Lemay, L. P. Kouwenhoven, and C. Dekker  

E-Print Network (OSTI)

the nanotubes and their binding energy to a supporting gold substrate. More importantly, our STS studies showScanning tunneling spectroscopy on crossed carbon nanotubes J. W. Janssen, S. G. Lemay, L. P Delft, The Netherlands Received 3 October 2001; published 8 March 2002 Crossing nanotubes were

Dekker, Cees

460

Graphene on Ru(0001) Moire Corrugation Studied by Scanning Tunneling Microscopy on Au/Graphene/Ru(0001) Heterostructures  

E-Print Network (OSTI)

Graphene on Ru(0001) Moire Corrugation Studied by Scanning Tunneling Microscopy on Au/Graphene on graphene/Ru(0001) were used to study the corrugation of the moire structure of graphene/Ru(0001 for the graphene/Ru(0001) moire is of structural nature rather than electronic. STM showed a large value

Ciobanu, Cristian

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

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

462

Scanning tunneling microscope tip as a positionable contact: Probing a Josephson-junction array at subkelvin temperatures  

E-Print Network (OSTI)

Scanning tunneling microscope tip as a positionable contact: Probing a Josephson-junction arrayK. The STM enables us to probe the structure, a Josephson-junction array, at various positions. Examples of such systems are two- dimensional electron gases and Josephson junction arrays.1

463

Evaluation of Terrestrial Laser Scanning and Ground Penetrating Radar for Field-Based High-Throughput Phenotyping in Wheat Breeding  

E-Print Network (OSTI)

laser scanning (TLS) and ground penetrating radar (GPR) have the potential to fill this gap by non-invasively estimating biomass and mapping three-dimensional above- and below-ground vegetation. The research objective was to evaluate the use of TLS...

Thompson, Sean M

2014-08-05T23:59:59.000Z

464

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

465

Local random potentials of high differentiability to model the Landscape  

E-Print Network (OSTI)

We generate random functions locally via a novel generalization of Dyson Brownian motion, such that the functions are in a desired differentiability class, while ensuring that the Hessian is a member of the Gaussian orthogonal ensemble (other ensembles might be chosen if desired). Potentials in such higher differentiability classes are required/desirable to model string theoretical landscapes, for instance to compute cosmological perturbations (e.g., smooth first and second derivatives for the power-spectrum) or to search for minima (e.g., suitable de Sitter vacua for our universe). Since potentials are created locally, numerical studies become feasible even if the dimension of field space is large (D ~ 100). In addition to the theoretical prescription, we provide some numerical examples to highlight properties of such potentials; concrete cosmological applications will be discussed in companion publications.

Thorsten Battefeld; Chirag Modi

2014-09-17T23:59:59.000Z

466

Determination of the Boltzmann Constant Using the Differential - Cylindrical Procedure  

E-Print Network (OSTI)

We report in this paper the progresses on the determination of the Boltzmann constant using the acoustic gas thermometer (AGT) of fixed-length cylindrical cavities. First, we present the comparison of the molar masses of pure argon gases through comparing speeds of sound of gases. The procedure is independent from the methodology by Gas Chromatography-Mass Spectrometry (GC-MS). The experimental results show good agreement between both methods. The comparison offers an independent inspection of the analytical results by GC-MS. Second, we present the principle of the novel differential-cylindrical procedure based on the AGT of two fixed-length cavities. The deletion mechanism for some major perturbations is analyzed for the new procedure. The experimental results of the differential-cylindrical procedure demonstrate some major improvements on the first, second acoustic and third virial coefficients, and the excess half-widths. The three acoustic virial coefficients agree well with the stated-of-the-art experime...

Feng, X J; Lin, H; Gillis, K A; Moldover, M R

2015-01-01T23:59:59.000Z

467

Iterative solution of ordinary differential equations with polynomial coefficients  

E-Print Network (OSTI)

ITERATIVE SOLUTION OF ORDINARY DIFFERENTIAL EQUATIONS WITH POLYNOMIAL COEFFICIENTS A Thesis By JIMMIE CHARLES RHEA FOREHAND Submitted to the Graduate College of the Texas A&M University in partial fulfillment of the requirements... for the degree of MASTER OF SCIENCE August 1965 Major Subject Mathematics FAMILIES OF FIFTH ORDER RUNGE-KUTTA FORMULAS A Thesis By HARRY PAUL KONEN 4 0 0 IXI v 0 Approved as to style and content by: (Chairman of Committee) (Head of Departmen...

Forehand, Jimmie Charles Rhea

1965-01-01T23:59:59.000Z

468

Differentiable but exact formulation of density-functional theory  

SciTech Connect

The universal density functional F of density-functional theory is a complicated and ill-behaved function of the density—in particular, F is not differentiable, making many formal manipulations more complicated. While F has been well characterized in terms of convex analysis as forming a conjugate pair (E, F) with the ground-state energy E via the Hohenberg–Kohn and Lieb variation principles, F is nondifferentiable and subdifferentiable only on a small (but dense) subset of its domain. In this article, we apply a tool from convex analysis, Moreau–Yosida regularization, to construct, for any ? > 0, pairs of conjugate functionals ({sup ?}E, {sup ?}F) that converge to (E, F) pointwise everywhere as ? ? 0{sup +}, and such that {sup ?}F is (Fréchet) differentiable. For technical reasons, we limit our attention to molecular electronic systems in a finite but large box. It is noteworthy that no information is lost in the Moreau–Yosida regularization: the physical ground-state energy E(v) is exactly recoverable from the regularized ground-state energy {sup ?}E(v) in a simple way. All concepts and results pertaining to the original (E, F) pair have direct counterparts in results for ({sup ?}E, {sup ?}F). The Moreau–Yosida regularization therefore allows for an exact, differentiable formulation of density-functional theory. In particular, taking advantage of the differentiability of {sup ?}F, a rigorous formulation of Kohn–Sham theory is presented that does not suffer from the noninteracting representability problem in standard Kohn–Sham theory.

Kvaal, Simen, E-mail: simen.kvaal@kjemi.uio.no; Ekström, Ulf; Helgaker, Trygve [Centre for Theoretical and Computational Chemistry, Department of Chemistry, University of Oslo, P.O. Box 1033 Blindern, N-0315 Oslo (Norway)] [Centre for Theoretical and Computational Chemistry, Department of Chemistry, University of Oslo, P.O. Box 1033 Blindern, N-0315 Oslo (Norway); Teale, Andrew M. [Centre for Theoretical and Computational Chemistry, Department of Chemistry, University of Oslo, P.O. Box 1033 Blindern, N-0315 Oslo (Norway) [Centre for Theoretical and Computational Chemistry, Department of Chemistry, University of Oslo, P.O. Box 1033 Blindern, N-0315 Oslo (Norway); School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD (United Kingdom)

2014-05-14T23:59:59.000Z

469

LM111, LM211, LM311 DIFFERENTIAL COMPARATORS WITH STROBES  

E-Print Network (OSTI)

LM111, LM211, LM311 DIFFERENTIAL COMPARATORS WITH STROBES SLCS007H - SEPTEMBER 1973 - REVISED- VCC+ COL OUT BAL/STRB BALANCE LM111 . . . JG PACKAGE LM211 . . . D, P, OR PW PACKAGE LM311 . . . D, P/STRB NC NC IN+ NC IN- NC LM111 . . . FK PACKAGE (TOP VIEW) NC EMITOUT NC BALANCE NCNC NC NC CC-V CC+V NC

Ravikumar, B.

470

CONVECTION AND DIFFERENTIAL ROTATION IN F-TYPE STARS  

SciTech Connect

Differential rotation is a common feature of main-sequence spectral F-type stars. In seeking to make contact with observations and to provide a self-consistent picture of how differential rotation is achieved in the interiors of these stars, we use the three-dimensional anelastic spherical harmonic (ASH) code to simulate global-scale turbulent flows in 1.2 and 1.3 M{sub Sun} F-type stars at varying rotation rates. The simulations are carried out in spherical shells that encompass most of the convection zone and a portion of the stably stratified radiative zone below it, allowing us to explore the effects of overshooting convection. We examine the scaling of the mean flows and thermal state with rotation rate and mass and link these scalings to fundamental parameters of the simulations. Indeed, we find that the differential rotation becomes much stronger with more rapid rotation and larger mass, scaling as {Delta}{Omega}{proportional_to}M {sup 3.9}{Omega}{sup 0.6}{sub 0}. Accompanying the growing differential rotation is a significant latitudinal temperature contrast, with amplitudes of 1000 K or higher in the most rapidly rotating cases. This contrast in turn scales with mass and rotation rate as {Delta}T{proportional_to}M {sup 6.4}{Omega}{sup 1.6}{sub 0}. On the other hand, the meridional circulations become much weaker with more rapid rotation and with higher mass, with their kinetic energy decreasing as KE{sub MC}{proportional_to}M {sup -1.2}{Omega}{sup -0.8}{sub 0}. Additionally, three of our simulations exhibit a global-scale shear instability within their stable regions that persists for the duration of the simulations. The flow structures associated with the instabilities have a direct coupling to and impact on the flows within the convection zone.

Augustson, Kyle C.; Toomre, Juri [JILA and Department of Astrophysical and Planetary Sciences, University of Colorado, Boulder, CO 80309 (United States); Brown, Benjamin P. [Department of Astronomy and Center for Magnetic Self-Organization (CMSO) in Laboratory and Astrophysical Plasmas, University of Wisconsin, Madison, WI 53706-1582 (United States); Brun, Allan Sacha [DSM/IRFU/SAp, CEA-Saclay and UMR AIM, CEA-CNRS-Universite Paris 7, F-91191 Gif-sur-Yvette (France); Miesch, Mark S., E-mail: Kyle.Augustson@colorado.edu [High Altitude Observatory, Center Green 1, Boulder, CO 80301 (United States)

2012-09-10T23:59:59.000Z

471

Solutions of differential equations by linear programming techniques  

E-Print Network (OSTI)

. INTRODUCTION II. LINEAR PROGRAMMING General Discussion. Theory of Linear ProSrsmming. a Duality . The Simplex Method anA LP/90. III. LINEAR DIFFZREKTAL EQUATIONS. General Discussion. A Limital Solution to a Differential Equation IV. THE ~ PROGRAMING... be traced back much further. A study of mathematical game theory was initiated. in 1928 by Von Neumann. In 1944 Von Neumann and Morgenstern published the book, Theory of Games and. Economic Behavior which is an economic application of minimax theory...

Saye, Jake Lee

2012-06-07T23:59:59.000Z

472

Towards a deep characterization of a 64-fold-pixelated position sensitive detector for a new {gamma}-scanning system of HPGe segmented detectors  

SciTech Connect

Characterization of the electrical response of the HPGe segmented detectors is one of the current goals for the Nuclear Physics community in order to perform {gamma}-ray tracking or even imaging with these detectors. For this purpose, scanning devices have to be developed to achieve the signal-position association with the highest precision. In this laboratory, a new scanning system, SALSA (Salamanca Lyso-based Scanning Array), consisting on a high spatial resolution {gamma} camera, is a under development. In this work the whole scanning system is presented and first results for the characterization of the {gamma} camera are shown. (authors)

Hernandez-Prieto, A.; Quintana, B. [Laboratorio de Radiaciones Ionizantes, Univ. of Salamanca, 37007 (Spain)

2011-07-01T23:59:59.000Z

473

Comparison of Pseudorandom Numbers Generators and Chaotic Numbers Generators used in Differential Evolution  

Science Journals Connector (OSTI)

Differential evolution is one of the great family of evolutionary algorithms. As well as all evolutionary algorithms differential evolution uses pseudorandom numbers generators in many steps of algorithm. In this...

Lenka Skanderova; Adam ?eho?

2014-01-01T23:59:59.000Z

474

Force-free magnetosphere of an aligned rotator with differential rotation of open magnetic field lines  

Science Journals Connector (OSTI)

Here we briefly report on results of self-consistent numerical modeling of a differentially rotating force-free magnetosphere of an aligned rotator. We show that differential rotation of the open field line z...

A. N. Timokhin

2007-01-01T23:59:59.000Z

475

Force-free magnetosphere of an aligned rotator with differential rotation of open magnetic field lines  

Science Journals Connector (OSTI)

Here we briefly report on results of self-consistent numerical modeling of a differentially rotating force-free magnetosphere of an aligned rotator. We show that differential rotation of the open field line z...

A. N. Timokhin

2007-04-01T23:59:59.000Z

476

Nitric oxide-induced DNA recombination & glycosaminoglycan mediated differentiation in stem cells  

E-Print Network (OSTI)

(cont.) Such therapeutic approaches require an understanding of the mechanisms regulating stem cell differentiation. The second part of this thesis investigates the role of HSGAGs in embryonic stem cell differentiation ...

Kiziltepe, Tanyel, 1976-

2005-01-01T23:59:59.000Z

477

Integration-by-parts identities from the viewpoint of differential geometry  

E-Print Network (OSTI)

We present a new method to construct integration-by-part (IBP) identities from the viewpoint of differential geometry. Vectors for generating IBP identities are reformulated as differential forms, via Poincar\\'{e} duality. Using the tools of differential geometry and commutative algebra, we can efficiently find differential forms which generate on-shell IBP relation without doubled propagator. Various $D=4$ two-loop examples are presented.

Yang Zhang

2014-08-18T23:59:59.000Z

478

Analysis of an interface relaxation method for composite elliptic differential equations  

Science Journals Connector (OSTI)

The theoretical analysis on both the continuous (differential) and the discrete (linear algebra) levels of an interface relaxation method for solving elliptic differential equations is presented. The convergence of the method for 1-dimensional problems ... Keywords: Domain decomposition methods, Elliptic partial differential equations, Interface relaxation

P. Tsompanopoulou; E. Vavalis

2009-04-01T23:59:59.000Z

479

On parameter and state estimation for linear differential-algebraic equations  

Science Journals Connector (OSTI)

The current demand for more complex models has initiated a shift away from state-space models towards models described by differential-algebraic equations (DAEs). These models arise as the natural product of object-oriented modeling languages, such as ... Keywords: Differential-algebraic equations, Estimation, Gray-box models, Kalman filtering, Modeling, Parameter estimation, State estimation, Stochastic differential-algebraic equations

Markus Gerdin; Thomas B. Schön; Torkel Glad; Fredrik Gustafsson; Lennart Ljung

2007-03-01T23:59:59.000Z

480

Combinatorial optimization model and MIP formulation for the structural analysis of conditional differential-algebraic systems  

Science Journals Connector (OSTI)

In this paper we consider the structural analysis problem for differential-algebraic systems with conditional equations. This problem consists, given a conditional differential-algebraic system, in verifying if the system is structurally nonsingular ... Keywords: Branch-and-Cut algorithm, Differential-algebraic system, Graph, Integer linear program, Matching, Structural analysis

Mathieu Lacroix; A. Ridha Mahjoub; Sébastien Martin

2011-09-01T23:59:59.000Z

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.


481

CCAAT/enhancer binding protein gene promoter: binding of nuclear factors during differentiation of 3T3-L1 preadipocytes.  

Science Journals Connector (OSTI)

...gene promoter: binding of nuclear factors during differentiation...these differentially expressed nuclear factors. The factor present...that play a central role in energy metabolism, particularly in...the differentiation- induced nuclear factor that binds specifically...

R J Christy; K H Kaestner; D E Geiman; M D Lane

1991-01-01T23:59:59.000Z

482

SCANNING ELECTRON MICROSCOPY AND X-RAY DIFFRACTION ANALYSIS OF TANK 18 SAMPLES  

SciTech Connect

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

Patient-specific QA and delivery verification of scanned ion beam at NIRS-HIMAC  

SciTech Connect

Purpose: To evaluate a patient-specific QA program and system for constancy checking of a scanning delivery system developed at the National Institute of Radiological Sciences.Methods: For the patient-specific QA, all the planned beams are recalculated on a water phantom with treatment planning software (TPS). The recalculated dose distributions are compared with the measured distributions using a 2D ionization chamber array at several depths, and evaluated using gamma index analysis with criteria of 3% and 3 mm and a pass rate of 90%. For the constancy check, the authors developed the multiwire proportional chamber (MWPC), which can record the delivered 2D fluence images in a slice-by-slice manner. During irradiation for dosimetric QA with the 2D ionization chamber array and an accordion-type water phantom, the 2D fluence images are recorded using the MWPC in the delivery system. These recorded images are then compared to those taken in the treatment session to check the constancy check. This analysis also employs gamma index analysis using the same criteria as in the patient-specific QA. These patient-specific QA and constancy check evaluations were performed using the data of 122 patients.Results: In the patient-specific QA, the measured dose distributions agreed well with those calculated by the TPS, and the QA criteria were satisfied in all measurements. The additional check of the fluence comparison ensured the constancy of the delivered field during each treatment irradiation.Conclusions: The authors established a patient-specific QA program and additional check of delivery constancy in every treatment session. Fluence comparison is a strong tool for constancy checking of the delivery system.

Furukawa, Takuji; Inaniwa, Taku; Hara, Yousuke; Mizushima, Kota; Shirai, Toshiyuki; Noda, Koji [Medical Physics Research Group, Research Center for Charged Particle Therapy, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555 (Japan)] [Medical Physics Research Group, Research Center for Charged Particle Therapy, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555 (Japan)

2013-12-15T23:59:59.000Z

484

A scanning electron microscope study on agglomeration in petroleum coke-fired FBC boilers  

Science Journals Connector (OSTI)

Ten samples originating from different boiler FBC systems burning petroleum coke and one laboratory sample were chosen to perform a study on the development, structure, and composition of deposits formed by agglomeration in various locations. The work focused on examination by scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) analysis. The possibility of a contribution of liquid phases in the adherence to solid surfaces and in agglomeration was discussed and checks by SEM, EDX, and analysis by neutron activation were performed; no evidence could be found either for liquid phases or for any role of vanadium or alkaline element compounds. The agglomerations result from the continued sintering of CaSO4 particles until they build up a strong framework that is indefinitely extended, into which particles of different and complex compositions are bound, without contributing to the cohesion. Chemical sintering occurring by the sulphation of CaO into CaSO4 appears to be an important contribution while CaO is still available, but sintering also occurs by mass transfer mechanisms and continues after the depletion of CaO. Deposits formed in regions only reached by fly ash (convection section), and also in in-bed deposits, grow from particles <50 ?m, mostly in the range of 10 ?m or less. In regions collecting bed ash (e.g., J-valves), the deposit grows from the sintering together of particles on the order of 100–300 ?m (originally bed ash particles), which themselves appear as conglomerates of extensively sintered smaller particles.

J.V Iribarne; E.J Anthony; A Iribarne

2003-01-01T23:59:59.000Z

485

Work-function measurement by high-resolution scanning Kelvin nanoprobe  

Science Journals Connector (OSTI)

Nanoscience promises to transform today's world in the same way that integrated semiconductor devices transformed the world of electronics and computation. In the post-genomic era, the greatest challenge is to make connections between the structures and functions of biomolecules at the nanometre-scale level in order to underpin the understanding of larger scale systems in the fields of human biology and physiology. To achieve this, instruments with new capabilities need to be researched and developed, with particular emphasis on new levels of sensitivity, precision and resolution for biomolecular analysis. This paper describes an instrument able to analyse structures that range from tenths of a nanometre (proteins, DNA) to micron-scale structures (living cells), which can be investigated non-destructively in their normal state and subsequently in chemical- or biochemical-modified conditions. The high-resolution scanning Kelvin nanoprobe (SKN) measures the work-function changes at molecular level, instigated by local charge reconfiguration due to translational motion of mobile charges, dipolar relaxation of bound charges, interfacial polarization and structural and conformational modifications. In addition to detecting surface electrical properties, the instrument offers, in parallel, the surface topographic image, with nanometre resolution. The instrument can also be used to investigate subtle work function/topography variations which occur in, for example, corrosion, contamination, adsorption and desorption of molecules, crystallographic studies, mechanical stress studies, surface photovoltaic studies, material science, biocompatibility studies, microelectronic characterization in semiconductor technology, oxide and thin films, surface processing and treatments, surfaces and interfaces characterization. This paper presents the design and development of the instrument, the basic principles of the method and the challenges involved to achieve nanometric resolution and sub-millivolt sensitivity, for both the topographic imaging of surface micromorphology and surface potential and work-function determination.

Larisa-Emilia Cheran; Sherri Johnstone; Saman Sadeghi; Michael Thompson

2007-01-01T23:59:59.000Z

486

Efficient AUV Navigation Fusing Acoustic Ranging and Side-scan Sonar Maurice F. Fallon, Michael Kaess, Hordur Johannsson and John J. Leonard  

E-Print Network (OSTI)

modems and relative pose constraints arising from targets detected in side-scan sonar im- ages -- particularly in sparse marine environments. A key feature of our approach is its intended scalability to single-scan sonar, initially developed by the US Navy, has been widely used for ship, ROV and AUV survey since its

Kaess, Michael

487

Quantum groups, non-commutative differential geometry and applications  

SciTech Connect

The topic of this thesis is the development of a versatile and geometrically motivated differential calculus on non-commutative or quantum spaces, providing powerful but easy-to-use mathematical tools for applications in physics and related sciences. A generalization of unitary time evolution is proposed and studied for a simple 2-level system, leading to non-conservation of microscopic entropy, a phenomenon new to quantum mechanics. A Cartan calculus that combines functions, forms, Lie derivatives and inner derivations along general vector fields into one big algebra is constructed for quantum groups and then extended to quantum planes. The construction of a tangent bundle on a quantum group manifold and an BRST type approach to quantum group gauge theory are given as further examples of applications. The material is organized in two parts: Part I studies vector fields on quantum groups, emphasizing Hopf algebraic structures, but also introducing a ``quantum geometric`` construction. Using a generalized semi-direct product construction we combine the dual Hopf algebras A of functions and U of left-invariant vector fields into one fully bicovariant algebra of differential operators. The pure braid group is introduced as the commutant of {Delta}(U). It provides invariant maps A {yields} U and thereby bicovariant vector fields, casimirs and metrics. This construction allows the translation of undeformed matrix expressions into their less obvious quantum algebraic counter parts. We study this in detail for quasitriangular Hopf algebras, giving the determinant and orthogonality relation for the ``reflection`` matrix. Part II considers the additional structures of differential forms and finitely generated quantum Lie algebras -- it is devoted to the construction of the Cartan calculus, based on an undeformed Cartan identity.

Schupp, P. [Lawrence Berkeley Lab., CA (United States)]|[California Univ., Berkeley, CA (United States). Dept. of Physics

1993-12-09T23:59:59.000Z

488

State-Constrained Optimal Control Problems of Impulsive Differential Equations  

SciTech Connect

The present paper studies an optimal control problem governed by measure driven differential systems and in presence of state constraints. The first result shows that using the graph completion of the measure, the optimal solutions can be obtained by solving a reparametrized control problem of absolutely continuous trajectories but with time-dependent state-constraints. The second result shows that it is possible to characterize the epigraph of the reparametrized value function by a Hamilton-Jacobi equation without assuming any controllability assumption.

Forcadel, Nicolas, E-mail: forcadel@ceremade.dauphine.fr [Universite Paris-Dauphine, Ceremade (France); Rao Zhiping, E-mail: Zhiping.Rao@ensta-paristech.fr; Zidani, Hasnaa, E-mail: Hasnaa.Zidani@ensta-paristech.fr [ENSTA ParisTech and INRIA-Saclay, Equipe COMMANDS (France)

2013-08-01T23:59:59.000Z

489

Solving nth order fuzzy differential equation by fuzzy Laplace transform  

E-Print Network (OSTI)

In this paper, we generalize the fuzzy Laplace transformation (FLT) for the nth derivative of a fuzzy-valued function named as nth derivative theorem and under the strongly generalized differentiability concept, we use it in an analytical solution method for the solution of an nth order fuzzy initial value problem (FIVP). This is a simple approach toward the solution of nth order fuzzy initial value problem (FIVP) by the nth generalized (FLT) form, and then we can use it to solve any order of FIVP. The related theorems and properties are proved. The method is illustrated with the help of some examples. We use MATLAB to evaluate the inverse Laplace transform.

Latif Ahmad; Muhammad Farooq; Saleem Abdullah

2014-03-02T23:59:59.000Z

490

Advances in experimental technique for quantitative two-dimensional dopant profiling by scanning capacitance microscopy  

Science Journals Connector (OSTI)

Several advances have been made toward the achievement of quantitative two-dimensional dopant and carrier profiling. To improve the dielectric and charge properties of the oxide–silicon interface a method of low temperature heat treatment has been developed which produces an insulating layer with consistent quality and reproducibility. After a standard polishing procedure is applied to cross-sectional samples the samples are heated to 300?°C for 30 min under ultraviolet illumination. This additional surface treatment dramatically improves dielectric layer uniformity scanning capacitancemicroscopy (SCM) signal to noise ratio and C–V curve flat band offset. Examples of the improvement in the surface quality and comparisons of converted SCM data with secondary ion mass spectrometry(SIMS) data are shown. A SCM tip study has also been performed that indicates significant tip depletion problems can occur. It is shown that dopedsilicon tips are often depleted by the applied SCM bias voltage causing errors in the SCM measured profile. Worn metalcoated and silicided silicon tips also can cause similar problems. When these effects are tested for and eliminated excellent agreement can be achieved between quantitative SCM profiles and SIMS data over a five-decade range of dopant density using a proper physical model. The impact of the tip size and shape on SCM spatial accuracy is simulated. A flat tip model gives a good agreement with experimental data. It is found that the dc offset used to compensate the C–V curve flat band shift has a consistently opposite sign on p- and n-type substrates. This corresponds to a positive surface on p-type silicon and to a negative surface on n-type silicon. Rectification of the large capacitance probing voltage is considered as a mechanism responsible for the apparent flat band shift of (0.4–1) V measured on the samples after heating under UV irradiation. To explain the larger flat band shift of (1–5) V tip induced charging of water-related traps is proposed and discussed.

V. V. Zavyalov; J. S. McMurray; C. C. Williams

1999-01-01T23:59:59.000Z

491

On the interplay effects with proton scanning beams in stage III lung cancer  

SciTech Connect

Purpose: To assess the dosimetric impact of interplay between spot-scanning proton beam and respiratory motion in intensity-modulated proton therapy (IMPT) for stage III lung cancer. Methods: Eleven patients were sampled from 112 patients with stage III nonsmall cell lung cancer to well represent the distribution of 112 patients in terms of target size and motion. Clinical target volumes (CTVs) and planning target volumes (PTVs) were defined according to the authors' clinical protocol. Uniform and realistic breathing patterns were considered along with regular- and hypofractionation scenarios. The dose contributed by a spot was fully calculated on the computed tomography (CT) images corresponding to the respiratory phase that the spot is delivered, and then accumulated to the reference phase of the 4DCT to generate the dynamic dose that provides an estimation of what might be delivered under the influence of interplay effect. The dynamic dose distributions at different numbers of fractions were compared with the corresponding 4D composite dose which is the equally weighted average of the doses, respectively, computed on respiratory phases of a 4DCT image set. Results: Under regular fractionation, the average and maximum differences in CTV coverage between the 4D composite and dynamic doses after delivery of all 35 fractions were no more than 0.2% and 0.9%, respectively. The maximum differences between the two dose distributions for the maximum dose to the spinal cord, heart V40, esophagus V55, and lung V20 were 1.2 Gy, 0.1%, 0.8%, and 0.4%, respectively. Although relatively large differences in single fraction, correlated with small CTVs relative to motions, were observed, the authors' biological response calculations suggested that this interfractional dose variation may have limited biological impact. Assuming a hypofractionation scenario, the differences between the 4D composite and dynamic doses were well confined even for single fraction. Conclusions: Despite the presence of interplay effect, the delivered dose may be reliably estimated using the 4D composite dose. In general the interplay effect may not be a primary concern with IMPT for lung cancers for the authors' institution. The described interplay analysis tool may be used to provide additional confidence in treatment delivery.

Li, Yupeng [Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, Texas 77030 and Applied Research, Varian Medical Systems, Palo Alto, California 94304 (United States)] [Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, Texas 77030 and Applied Research, Varian Medical Systems, Palo Alto, California 94304 (United States); Kardar, Laleh; Liao, Li; Lim, Gino [Department of Industrial Engineering, The University of Houston, Houston, Texas 77204 (United States)] [Department of Industrial Engineering, The University of Houston, Houston, Texas 77204 (United States); Li, Xiaoqiang; Li, Heng; Zhu, Ronald X.; Sahoo, Narayan; Gillin, Michael; Zhang, Xiaodong, E-mail: xizhang@mdanderson.org [Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, Texas 77030 (United States)] [Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, Texas 77030 (United States); Cao, Wenhua [Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, Texas 77030 and Department of Industrial Engineering, The University of Houston, Houston, Texas 77204 (United States)] [Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, Texas 77030 and Department of Industrial Engineering, The University of Houston, Houston, Texas 77204 (United States); Chang, Joe Y.; Liao, Zhongxing; Komaki, Ritsuko; Cox, James D. [Department of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas 77030 (United States)] [Department of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas 77030 (United States)

2014-02-15T23:59:59.000Z

492

Recent Progress in Retrieving Air Temperature Profiles and Air-Sea Temperature Differences from Infrared and Microwave Scan...  

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

Recent Progress in Retrieving Air Temperature Profiles Recent Progress in Retrieving Air Temperature Profiles and Air-Sea Temperature Differences from Infrared and Microwave Scanning Radiometer Data D. Cimini University of L'Aquila L'Aquila, Italy J. A. Shaw Department of Electrical and Computer Engineering Montana State University Bozeman, Montana E. R. Westwater Cooperative Institute for Research in the Environmental Sciences University of Colorado National Oceanic and Atmospheric Administration Environmental Technology Laboratory Boulder, Colorado Introduction A system of two scanning radiometers has been developed by National Oceanic and Atmospheric Administration (NOAA) Environmental Technology Laboratory (ETL) and deployed on the NOAA Ron H. Brown (RHB) Research Vessel (RV) during the Nauru99 cruise in the Tropical Western Pacific,

493

Reduced 30% scanning time 3D multiplexer integrated circuit applied to large array format 20KHZ frequency inkjet print heads  

E-Print Network (OSTI)

Enhancement of the number and array density of nozzles within an inkjet head chip is one of the keys to raise the printing speed and printing resolutions. However, traditional 2D architecture of driving circuits can not meet the requirement for high scanning speed and low data accessing points when nozzle numbers greater than 1000. This paper proposes a novel architecture of high-selection-speed three-dimensional data registration for inkjet applications. With the configuration of three-dimensional data registration, the number of data accessing points as well as the scanning lines can be greatly reduced for large array inkjet printheads with nozzles numbering more than 1000. This IC (Integrated Circuit) architecture involves three-dimensional multiplexing with the provision of a gating transistor for each ink firing resistor, where ink firing resistors are triggered only by the selection of their associated gating transistors. Three signals: selection (S), address (A), and power supply (P), are employed toge...

Liou, J -C

2008-01-01T23:59:59.000Z

494

A diamond-based scanning probe spin sensor operating at low temperature in ultra-high vacuum  

SciTech Connect

We present the design and performance of an ultra-high vacuum (UHV) low temperature scanning probe microscope employing the nitrogen-vacancy color center in diamond as an ultrasensitive magnetic field sensor. Using this center as an atomic-size scanning probe has enabled imaging of nanoscale magnetic fields and single spins under ambient conditions. In this article we describe an experimental setup to operate this sensor in a cryogenic UHV environment. This will extend the applicability to a variety of molecular systems due to the enhanced target spin lifetimes at low temperature and the controlled sample preparation under UHV conditions. The instrument combines a tuning-fork based atomic force microscope (AFM) with a high numeric aperture confocal microscope and the facilities for application of radio-frequency (RF) fields for spin manipulation. We verify a sample temperature of <50 K even for strong laser and RF excitation and demonstrate magnetic resonance imaging with a magnetic AFM tip.

Schaefer-Nolte, E.; Wrachtrup, J. [Max-Planck Institute for Solid State Research, 70569 Stuttgart (Germany) [Max-Planck Institute for Solid State Research, 70569 Stuttgart (Germany); 3rd Institute of Physics and Research Center SCoPE, University Stuttgart, 70569 Stuttgart (Germany); Reinhard, F. [3rd Institute of Physics and Research Center SCoPE, University Stuttgart, 70569 Stuttgart (Germany)] [3rd Institute of Physics and Research Center SCoPE, University Stuttgart, 70569 Stuttgart (Germany); Ternes, M., E-mail: m.ternes@fkf.mpg.de [Max-Planck Institute for Solid State Research, 70569 Stuttgart (Germany); Kern, K. [Max-Planck Institute for Solid State Research, 70569 Stuttgart (Germany) [Max-Planck Institute for Solid State Research, 70569 Stuttgart (Germany); Institut de Physique de la Matière Condenseé, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne (Switzerland)

2014-01-15T23:59:59.000Z

495

Imaging of quantum Hall edge states under quasiresonant excitation by a near-field scanning optical microscope  

SciTech Connect

A high resolution mapping of quantum Hall edge states has been performed by locally creating electrons with small excess energies with a near-field scanning optical microscope in a dilution refrigerator. We have observed fine structures parallel to the edge in photovoltage signals, which appear only at low temperature. The observed fine structures near sample edges have been seen to shift inward with increase in magnetic field in accordance with Chklovskii Shklovskii, and Glazman model.

Ito, H.; Shibata, Y.; Mamyoda, S.; Ootuka, Y.; Nomura, S. [Division of Physics, University of Tsukuba, Tennodai, Tsukuba, 305-8571 (Japan); Kashiwaya, S. [National Institute of Advanced Industrial Science and Technology (AIST), Umezono, Tsukuba, 305-8568 (Japan); Yamaguchi, M.; Akazaki, T.; Tamura, H. [NTT Basic Research Laboratories, NTT Corporation, Morinosato-Wakamiya, Atsugi, 243-0198 (Japan)

2013-12-04T23:59:59.000Z

496

Low-temperature scanning tunneling microscopy and transport measurements on adsorbate-induced two-dimensional electron systems  

SciTech Connect

We have performed not only magnetotransport measurements on two-dimensional electron systems (2DESs) formed at the cleaved surfaces of p-InAs but also observations of the surface morphology of the adsorbate atoms, which induced the 2DES at the surfaces of narrow band-gap semiconductors, with use of a scanning tunneling microscopy. The electron density of the 2DESs is compared to the atomic density of the isolated Ag adatoms on InAs surfaces.

Masutomi, Ryuichi; Triyama, Naotaka; Okamoto, Tohru [Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033 (Japan)

2013-12-04T23:59:59.000Z

497

Electronic properties of the Ga vacancy in GaP(110) surfaces determined by scanning tunneling microscopy  

Science Journals Connector (OSTI)

The electronic properties of uncharged Ga monovacancies in GaP(110) surfaces are determined from voltage-dependent scanning tunneling microscopy images. The signatures of localized defect states in the band gap are analyzed and their spatial location is determined. Empty and occupied defect states exist. Depressed dangling bonds in the occupied-state images indicate an inward relaxation of the neighboring P atoms. The results agree with recent theoretical work.

Ph. Ebert and K. Urban

1998-07-15T23:59:59.000Z

498

Differential Transcriptional Regulation of Aggregatibacter actinomycetemcomitans lsrACDBFG and lsrRK Operons by Integration Host Factor Protein  

Science Journals Connector (OSTI)

...FV500 confocal scanning laser microscope (Olympus...600, using an argon laser. Confocal images were...expressed as hexahistidine fusion proteins and purified...B) transcriptional fusion constructs showing the...analyzed by confocal laser scanning microscopy using...

Ascención Torres-Escobar; María Dolores Juárez-Rodríguez; Donald R. Demuth

2014-02-14T23:59:59.000Z

499

Measurement of semiconductor local carrier concentration from displacement current-voltage curves with a scanning vibrating probe  

Science Journals Connector (OSTI)

A theoretical equation has been fitted to displacement current-voltage curves of semiconductor in order to obtain the local carrier concentration of the semiconductor. The distance between a semiconductor surface and a scanning probe is changed sinusoidally and is adjusted as small as a few nm at which tunneling current flows. Displacement current due to the change in electric flux from the semiconductor surface to the scanning probe flows periodically in accordance with the vibration of the scanning probe, and it is separated from tunneling current using a two-phase lock-in amplifier. The displacement current-probe voltage curve is analyzed by taking into account two-dimensional electric flux profile from the semiconductor surface. It is realized that the lateral resolution of the displacement current depends on the probe voltage and that it is between one-eighth and one-fifteenth smaller than the top radius of the probe since the depletion-layer width of the semiconductor is determined by the probe voltage, the distance, and the carrier concentration. The theoretical displacement current-voltage curves are in good agreement with the measurement in both voltage regions where the majority carriers are accumulated and depleted. The local carrier concentration can be determined by fitting the theoretical displacement current-voltage curve with the experimental results.

Yutaka Majima; Yutaka Oyama; Mitsumasa Iwamoto

2000-07-15T23:59:59.000Z

500

A new Scanning Transmission X-ray Microscope at the ALS for operation up to 2500eV  

SciTech Connect

We report on the design and construction of a higher energy Scanning Transmission X-ray Microscope on a new bend magnet beam line at the Advanced Light Source. Previously we have operated such an instrument on a bend magnet for C, N and O 1s NEXAFS spectroscopy. The new instrument will have similar performance at higher energies up to and including the S 1s edge at 2472eV. A new microscope configuration is planned. A more open geometry will allow a fluorescence detector to count emitted photons from the front surface of the sample. There will be a capability for zone plate scanning in addition to the more conventional sample scanning mode. This will add the capability for imaging a massive sample at high resolution over a limited field of view, so that heavy reaction cells may be used to study processes in-situ, exploiting the longer photon attenuation length and the longer zone plate working distances available at higher photon energy. The energy range will extend down to include the C1s edge at 300eV, to allow high energy NEXAFS microscopic studies to correlate with the imaging of organics in the same sample region of interest.

Kilcoyne, David; Ade, Harald; Attwood, David; Hitchcock, Adam; McKean, Pat; Mitchell, Gary; Monteiro, Paulo; Tyliszczak, Tolek; Warwick, Tony

2010-01-31T23:59:59.000Z