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Note: This page contains sample records for the topic "microscope n2 purged" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
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1

Purged window apparatus utilizing heated purge gas  

DOE Patents (OSTI)

A purged window apparatus utilizing tangentially injected heated purge gases in the vicinity of electromagnetic radiation transmitting windows, and a tapered external mounting tube to accelerate these gases to provide a vortex flow on the window surface and a turbulent flow throughout the mounting tube. Use of this apparatus prevents backstreaming of gases under investigation which are flowing past the mouth of the mounting tube which would otherwise deposit on the windows. Lengthy spectroscopic investigations and analyses can thereby be performed without the necessity of interrupting the procedures in order to clean or replace contaminated windows.

Ballard, Evan O. (Los Alamos, NM)

1984-01-01T23:59:59.000Z

2

Purge water management system  

DOE Patents (OSTI)

A purge water management system for effectively eliminating the production of purge water when obtaining a groundwater sample from a monitoring well. In its preferred embodiment, the purge water management system comprises an expandable container, a transportation system, and a return system. The purge water management system is connected to a wellhead sampling configuration, typically permanently installed at the well site. A pump, positioned with the monitoring well, pumps groundwater through the transportation system into the expandable container, which expands in direct proportion with volume of groundwater introduced, usually three or four well volumes, yet prevents the groundwater from coming into contact with the oxygen in the air. After this quantity of groundwater has been removed from the well, a sample is taken from a sampling port, after which the groundwater in the expandable container can be returned to the monitoring well through the return system. The purge water management system prevents the purge water from coming in contact with the outside environment, especially oxygen, which might cause the constituents of the groundwater to oxidize. Therefore, by introducing the purge water back into the monitoring well, the necessity of dealing with the purge water as a hazardous waste under the Resource Conservation and Recovery Act is eliminated.

Cardoso-Neto, Joao E. (North Augusta, SC); Williams, Daniel W. (Aiken, SC)

1996-01-01T23:59:59.000Z

3

Purge water management system  

DOE Patents (OSTI)

A purge water management system is described for effectively eliminating the production of purge water when obtaining a groundwater sample from a monitoring well. In its preferred embodiment, the purge water management system comprises an expandable container, a transportation system, and a return system. The purge water management system is connected to a wellhead sampling configuration, typically permanently installed at the well site. A pump, positioned with the monitoring well, pumps groundwater through the transportation system into the expandable container, which expands in direct proportion with volume of groundwater introduced, usually three or four well volumes, yet prevents the groundwater from coming into contact with the oxygen in the air. After this quantity of groundwater has been removed from the well, a sample is taken from a sampling port, after which the groundwater in the expandable container can be returned to the monitoring well through the return system. The purge water management system prevents the purge water from coming in contact with the outside environment, especially oxygen, which might cause the constituents of the groundwater to oxidize. Therefore, by introducing the purge water back into the monitoring well, the necessity of dealing with the purge water as a hazardous waste under the Resource Conservation and Recovery Act is eliminated.

Cardoso-Neto, J.E.; Williams, D.W.

1995-01-01T23:59:59.000Z

4

Purge needs in absorption chillers  

Science Conference Proceedings (OSTI)

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

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

1993-10-01T23:59:59.000Z

5

Selective purge for hydrogenation reactor recycle loop  

SciTech Connect

Processes and apparatus for providing improved contaminant removal and hydrogen recovery in hydrogenation reactors, particularly in refineries and petrochemical plants. The improved contaminant removal is achieved by selective purging, by passing gases in the hydrogenation reactor recycle loop or purge stream across membranes selective in favor of the contaminant over hydrogen.

Baker, Richard W. (Palo Alto, CA); Lokhandwala, Kaaeid A. (Union City, CA)

2001-01-01T23:59:59.000Z

6

An Optimal Algorithm for Purging Regular Schemes  

Science Conference Proceedings (OSTI)

A joint application of four optimizing transformations for purging imperative programs—elimination of useless statements, unwinding of degenerate loops, removal from loops, and removal from branch statements—is considered. A model of regular ...

D. L. Uvarov

2000-11-01T23:59:59.000Z

7

Well purge and sample apparatus and method  

DOE Patents (OSTI)

The present invention specifically permits purging and/or sampling of a well but only removing, at most, about 25% of the fluid volume compared to conventional methods and, at a minimum, removing none of the fluid volume from the well. The invention is an isolation assembly with a packer, pump and exhaust, that is inserted into the well. The isolation assembly is designed so that only a volume of fluid between the outside diameter of the isolation assembly and the inside diameter of the well over a fluid column height from the bottom of the well to the top of the active portion (lower annulus) is removed. The packer is positioned above the active portion thereby sealing the well and preventing any mixing or contamination of inlet fluid with fluid above the packer. Ports in the wall of the isolation assembly permit purging and sampling of the lower annulus along the height of the active portion.

Schalla, Ronald (Kennewick, WA); Smith, Ronald M. (Richland, WA); Hall, Stephen H. (Kennewick, WA); Smart, John E. (Richland, WA); Gustafson, Gregg S. (Redmond, WA)

1995-01-01T23:59:59.000Z

8

Well purge and sample apparatus and method  

DOE Patents (OSTI)

The present invention specifically permits purging and/or sampling of a well but only removing, at most, about 25% of the fluid volume compared to conventional methods and, at a minimum, removing none of the fluid volume from the well. The invention is an isolation assembly with a packer, pump and exhaust, that is inserted into the well. The isolation assembly is designed so that only a volume of fluid between the outside diameter of the isolation assembly and the inside diameter of the well over a fluid column height from the bottom of the well to the top of the active portion (lower annulus) is removed. The packer is positioned above the active portion thereby sealing the well and preventing any mixing or contamination of inlet fluid with fluid above the packer. Ports in the wall of the isolation assembly permit purging and sampling of the lower annulus along the height of the active portion. 8 figs.

Schalla, R.; Smith, R.M.; Hall, S.H.; Smart, J.E.; Gustafson, G.S.

1995-10-24T23:59:59.000Z

9

Benefits of evaporating FGD purge water  

SciTech Connect

In the US and the European Union, scrubbers are installed on all new coal-fired power plants because their technology is considered the best available for removing SO{sub 2}. A zero liquid discharge (ZLD) system is the best technology for treating wet scrubber wastewate. With the future promising stricter limits on power plants' water use, ZLD systems that concentrate scrubber purge streams are sure to become as common as ZLD cooling tower blowdonw systems. 7 figs.

Shaw, W.A. [HPD, Plainfield, IL (United States)

2008-03-15T23:59:59.000Z

10

Transpiration Purging Access Probe for Particulate Laden or  

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

need for sensors that tolerate dirty environments, research is currently active on the patent-pending technology "Transpiration Purging Access Probe for Particulate Laden or...

11

Big microscope  

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

microscope Name: stacy Status: NA Age: NA Location: NA Country: NA Date: Around 1993 Question: What type of Microscope has the highest magnification? Replies: What type of...

12

Supercritical N = 2 string theory  

E-Print Network (OSTI)

The N=2 string is examined in dimensions above the critical dimension (D=4) in a linear dilaton background. We demonstrate that string states in this background propagate in a single physical time dimension, as opposed to two such dimensions present when the dilaton gradient vanishes in D=4. We also find exact solutions describing dynamical dimensional reduction and transitions from N=2 string theory to bosonic string theory via closed-string tachyon condensation.

Hellerman, Simeon

2007-01-01T23:59:59.000Z

13

microscopes_2001  

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

5 . His work was a giant 6 6 6 6 6 for science. Today, microscopes are much stronger. An electron microscope can make tiny organisms look 200,000 times 7 7 7 7 7 size. A few...

14

New technology for purging the steam generators of nuclear power plants  

Science Conference Proceedings (OSTI)

A technology for removal of undissolved impurities from a horizontal steam generator using purge water is developed on the basis of a theoretical analysis. A purge with a maximal flow rate is drawn off from the zone with the highest accumulation of sludge in the lower part of the steam generator after the main circulation pump of the corresponding loop is shut off and the temperatures of the heat transfer medium at the inlet and outlet of the steam generator have equilibrated. An improved purge configuration is used for this technology; it employs shutoff and regulator valves, periodic purge lines separated by a cutoff fixture, and a D{sub y} 100 drain union as a connector for the periodic purge. Field tests show that the efficiency of this technology for sludge removal by purge water is several times that for the standard method.

Budko, I. O.; Kutdjusov, Yu. F.; Gorburov, V. I. [Scientific-Research Center for Energy Technology 'NICE Centrenergo' (Russian Federation); Rjasnyj, S. I. [JSC 'The All-Rissia Nuklear Power Engineering Research and Development Institute' (VNIIAM) (Russian Federation)

2011-07-15T23:59:59.000Z

15

RSE Table N2.1 and N2.2. Relative Standard Errors for Tables N2.1 and N2.2  

U.S. Energy Information Administration (EIA) Indexed Site

N2.1 and N2.2. Relative Standard Errors for Tables N2.1 and N2.2;" N2.1 and N2.2. Relative Standard Errors for Tables N2.1 and N2.2;" " Unit: Percents." " "," " "NAICS"," "," ","Residual","Distillate",,"LPG and",,"Coke"," " "Code(a)","Subsector and Industry","Total","Fuel Oil","Fuel Oil(b)","Natural Gas(c)","NGL(d)","Coal","and Breeze","Other(e)" ,,"Total United States" , 311,"Food",6,0,8,0,0,0,0,7 312,"Beverage and Tobacco Products",10,0,82,0,0,0,0,9 313,"Textile Mills",19,0,77,3,20,0,0,48 314,"Textile Product Mills",38,0,0,38,27,0,0,42

16

Pressing swing adsorption system using product gas as replacement for purge gas  

SciTech Connect

In a pressure swing adsorption plant for the purification and separation of gases, with several adsorbers, conducting respectively within one cycle the steps of adsorption, expansion or pressure equalization, purging, and pressure buildup, using as the purge gas residual gas released during the expansion of adsorbers, wherein pressure buildup is conducted at least in part with product gas, and when there is a malfunction in an adsorber yielding purge gas, the product gas is employed not only for the pressure buildup but also for purging one or more adsorbers. The amount of purge gas is controlled so that the adsorber or adsorbers, which are in the pressure buildup phase reach the desired adsorption pressure within a previously determined period of time.

Asztalos, S. A.

1984-10-09T23:59:59.000Z

17

Purged window apparatus. [On-line spectroscopic analysis of gas flow systems  

DOE Patents (OSTI)

A purged window apparatus is described which utilizes tangentially injected heated purge gases in the vicinity of electromagnetic radiation transmitting windows and a tapered external mounting tube to accelerate these gases to provide a vortex flow on the window surface and a turbulent flow throughout the mounting tube thereby preventing backstreaming of flowing gases under investigation in a chamber to which a plurality of similar purged apparatus is attached with the consequent result that spectroscopic analyses can be undertaken for lengthy periods without the necessity of interrupting the flow for cleaning or replacing the windows due to contamination.

Ballard, E.O.

1982-04-05T23:59:59.000Z

18

Purge gas protected transportable pressurized fuel cell modules and their operation in a power plant  

DOE Patents (OSTI)

A fuel cell generator apparatus and method of its operation involves: passing pressurized oxidant gas, (O) and pressurized fuel gas, (F), into fuel cell modules, (10 and 12), containing fuel cells, where the modules are each enclosed by a module housing (18), surrounded by an axially elongated pressure vessel (64), where there is a purge gas volume, (62), between the module housing and pressure vessel; passing pressurized purge gas, (P), through the purge gas volume, (62), to dilute any unreacted fuel gas from the modules; and passing exhaust gas, (82), and circulated purge gas and any unreacted fuel gas out of the pressure vessel; where the fuel cell generator apparatus is transpatable when the pressure vessel (64) is horizontally disposed, providing a low center of gravity.

Zafred, Paolo R. (Pittsburgh, PA); Dederer, Jeffrey T. (Valencia, PA); Gillett, James E. (Greensburg, PA); Basel, Richard A. (Plub Borough, PA); Antenucci, Annette B. (Pittsburgh, PA)

1996-01-01T23:59:59.000Z

19

Purge gas protected transportable pressurized fuel cell modules and their operation in a power plant  

DOE Patents (OSTI)

A fuel cell generator apparatus and method of its operation involves: passing pressurized oxidant gas and pressurized fuel gas into modules containing fuel cells, where the modules are each enclosed by a module housing surrounded by an axially elongated pressure vessel, and where there is a purge gas volume between the module housing and pressure vessel; passing pressurized purge gas through the purge gas volume to dilute any unreacted fuel gas from the modules; and passing exhaust gas and circulated purge gas and any unreacted fuel gas out of the pressure vessel; where the fuel cell generator apparatus is transportable when the pressure vessel is horizontally disposed, providing a low center of gravity. 11 figs.

Zafred, P.R.; Dederer, J.T.; Gillett, J.E.; Basel, R.A.; Antenucci, A.B.

1996-11-12T23:59:59.000Z

20

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.

Note: This page contains sample records for the topic "microscope n2 purged" 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

Critical phenomena in N=2* plasma  

E-Print Network (OSTI)

We use gauge theory/string theory correspondence to study finite temperature critical behaviour of mass deformed N=4 SU(N) supersymmetric Yang-Mills theory at strong coupling, also known as N=2* gauge theory. For certain range of the mass parameters, N=2* plasma undergoes a second-order phase transition. We compute all the static critical exponents of the model and demonstrate that the transition is of the mean-field theory type. We show that the dynamical critical exponent of the model is z=0, with multiple hydrodynamic relaxation rates at criticality. We point out that the dynamical critical phenomena in N=2* plasma is outside the dynamical universality classes established by Hohenberg and Halperin.

A. Buchel; C. Pagnutti

2010-10-16T23:59:59.000Z

22

Whitey Swagelok SCHe ball valves Provide Isolation between SCHe Purge Lines C and D and the Process Vent  

Science Conference Proceedings (OSTI)

These valves are 1/4 inch ball valves fabricated of 316 stainless steel. Packing is TFE (standard). They provide an isolation function betwen SCHe Purge Line C, (PV-V-*079), and Purge Line D, (PV-V-*080), and the Process Vent.

MISKA, C.R.

2000-09-03T23:59:59.000Z

23

N2Solar | Open Energy Information  

Open Energy Info (EERE)

N2Solar N2Solar Jump to: navigation, search Name N2Solar LLC Address 2855 E. Robidoux Rd. Place Sandy, Utah Zip 84093 Sector Solar Product HOE Solar performance optics for PV, CSP, Desal and UV water treatment Year founded 2003 Number of employees 1-10 Phone number 801 608 3180 Coordinates 40.601751°, -111.811322° 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":40.601751,"lon":-111.811322,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

24

Self-filling and self-purging apparatus for detecting spontaneous radiation from substances in fluids  

DOE Patents (OSTI)

Disclosed herein is a radiation detector providing for the in situ automatic sampling of fluids containing substances emitting radiation, especially Cerenkov radiation. The detector permits sampling within well casings and is self-purging such that no additional provisions must be established for the storage and disposal of contaminated fluids.

Larson, I. Lauren (Oak Ridge, TN); Chiles, Marion M. (Knoxville, TN); Miller, V. Clint (Concord, TN)

1993-01-01T23:59:59.000Z

25

Quantum N = 2 Supersymmetric Black Holes in the S-T Model  

E-Print Network (OSTI)

We consider axion-free quantum corrected black hole solutions in the context of the heterotic S-T model with half the N=2, D=4 supersymmetries unbroken. We express the perturbatively corrected entropy in terms of the electric and magnetic charges in such a way, that target-space duality invariance is manifest. We also discuss the microscopic origin of particular quantum black hole configurations. We propose a microscopic interpretation in terms of a gas of closed membranes for the instanton corrections to the entropy.

Behrndt, K; Gaida, I

1997-01-01T23:59:59.000Z

26

Bulk viscosity of N=2* plasma  

E-Print Network (OSTI)

We use gauge theory/string theory correspondence to study the bulk viscosity of strongly coupled, mass deformed SU(N_c) N=4 supersymmetric Yang-Mills plasma, also known as N=2^* gauge theory. For a wide range of masses we confirm the bulk viscosity bound proposed in arXiv:0708.3459. For a certain choice of masses, the theory undergoes a phase transition with divergent specific heat c_V ~ |1-T_c/T|^(-1/2). We show that, although bulk viscosity rapidly grows as T -> T_c, it remains finite in the vicinity of the critical point.

Alex Buchel; Chris Pagnutti

2008-12-18T23:59:59.000Z

27

Reading Comprehension - Microscopes  

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

Microscopes Microscopes It happened over 300 years _________ since ago before after in Holland. Anton van Leeuwenhoek (AN-tun van LAY-vun-hook) had a new microscope that he had _________ made lost previewed delivered . One day he _________ fell broke looked went through it at a drop of lake water. What he saw surprised him. The water was alive with what Leeuwenhoek called "wee beasties." The microscope made tiny organisms look 200 times _________ farther smaller darker larger than life size. Leeuwenhoek was one of the first scientists to see living things that were that _________ life small darker larger . His work was a giant _________ turtle gorilla step tower for science. Today, microscopes are much stronger. An electron microscope can make tiny organisms look 200,000 times _________ small over under life size. A few

28

On thermodynamic and microscopic reversibility  

E-Print Network (OSTI)

On Thermodynamic and Microscopic Reversibility Abstract. Theof the University of California. On Thermodynamic andMicroscopic Reversibility Thermodynamic reversibility The

Crooks, Gavin E.

2012-01-01T23:59:59.000Z

29

Recurrence Tracking Microscope  

E-Print Network (OSTI)

In order to probe nanostructures on a surface we present a microscope based on the quantum recurrence phenomena. A cloud of atoms bounces off an atomic mirror connected to a cantilever and exhibits quantum recurrences. The times at which the recurrences occur depend on the initial height of the bouncing atoms above the atomic mirror, and vary following the structures on the surface under investigation. The microscope has inherent advantages over existing techniques of scanning tunneling microscope and atomic force microscope. Presently available experimental technology makes it possible to develop the device in the laboratory.

Farhan Saif

2006-04-04T23:59:59.000Z

30

Microscopes - Teacher Overview  

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

Standards of Learning Download this Activity Background: With the invention of the microscope, scientist could see things they never could before. They discovered that we were...

31

Towards a Neutron Microscope  

Science Conference Proceedings (OSTI)

Towards a Neutron Microscope. Summary: ... The novel lens is a Wolter Optic similar in design to the telescope of the CHANDRA x-ray observatory. ...

2013-07-23T23:59:59.000Z

32

Microscopic Properties of Horizons  

E-Print Network (OSTI)

We suggest that all horizons of spacetime, no matter whether they are black hole, Rindler or de Sitter horizons, have certain microscopic properties in common. We propose that these propertues may be used as the starting points, or postulates, of a microscopic theory of gravity.

Jarmo Makela

2001-08-13T23:59:59.000Z

33

Seasonal variations in N2O emissions from central California  

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

Seasonal variations in N2O emissions from central California Seasonal variations in N2O emissions from central California Title Seasonal variations in N2O emissions from central California Publication Type Journal Article Year of Publication 2012 Authors Jeong, Seongeun, Chuanfeng Zhao, Arlyn E. Andrews, Edward J. Dlugokencky, Colm Sweeney, Laura Bianco, James M. Wilczak, and Marc L. Fischer Journal Geophysical Research Letters Volume 39 Issue 16 Keywords atmospheric transport, inverse modeling, nitrous oxide Abstract We estimate nitrous oxide (N2O) emissions from Central California for the period of December 2007 through November 2009 by comparing N2O mixing ratios measured at a tall tower (Walnut Grove, WGC) with transport model predictions based on two global a priori N2O emission models (EDGAR32 and EDGAR42). Atmospheric particle trajectories and surface footprints are computed using the Weather Research and Forecasting (WRF) and Stochastic Time-Inverted Lagrangian Transport (STILT) models. Regression analyses show that the slopes of predicted on measured N2O from both emission models are low, suggesting that actual N2O emissions are significantly higher than the EDGAR inventories for all seasons. Bayesian inverse analyses of regional N2O emissions show that posterior annual N2O emissions are larger than both EDGAR inventories by factors of 2.0 ± 0.4 (EDGAR32) and 2.1 ± 0.4 (EDGAR42) with seasonal variation ranging from 1.6 ± 0.3 to 2.5 ± 0.4 for an influence region of Central California within approximately 150 km of the tower. These results suggest that if the spatial distribution of N2O emissions in California follows the EDGAR emission models, then actual emissions are 2.7 ± 0.5 times greater than the current California emission inventory, and total N2O emissions account for 8.1 ± 1.4% of total greenhouse gas emissions from California.

34

N=2 Conformal Supergravity from Twistor-String Theory  

E-Print Network (OSTI)

A chiral superfield strength in N=2 conformal supergravity at linearized level is obtained by acting two superspace derivatives on N=4 chiral superfield strength which can be described in terms of N=4 twistor superfields. By decomposing SU(4)_R representation of N=4 twistor superfields into the SU(2)_R representation with an invariant U(1)_R charge, the surviving N=2 twistor superfields contain the physical states of N=2 conformal supergravity. These N=2 twistor superfields are functions of homogeneous coordinates of weighted complex projective space WCP^{3|4} where the two weighted fermionic coordinates have weight -1 and 3.

Changhyun Ahn

2004-12-17T23:59:59.000Z

35

TNKVNT: A model of the Tank 48 purge/ventilation exhaust system. Revision 1  

DOE Green Energy (OSTI)

The waste tank purge ventilation system for Tank 48 is designed to prevent dangerous concentrations of hydrogen or benzene from accumulating in the gas space of the tank. Fans pull the gas/water vapor mixture from the tank gas space and pass it sequentially through a demister, a condenser, a reheater, and HEPA filters before discharging to the environment. Proper operation of the HEPA filters requires that the gas mixture passing through them has a low relative humidity. The ventilation system has been modified by increasing the capacity of the fans and changing the condenser from a two-pass heat exchanger to a single-pass heat exchanger. It is important to understand the impact of these modifications on the operation of the system. A hydraulic model of the ventilation exhaust system has been developed. This model predicts the properties of the air throughout the system and the flowrate through the system, as functions of the tank gas space and environmental conditions. This document serves as a Software Design Report, a Software Coding report, and a User`s Manual. All of the information required for understanding and using this code is herein contained: the governing equations are fully developed, the numerical algorithms are described in detail, and an extensively commented code listing is included. This updated version of the code models the entire purge ventilation system, and is therefore more general in its potential applications.

Shadday, M.A. Jr.

1996-04-01T23:59:59.000Z

36

Microscope collision protection apparatus  

DOE Patents (OSTI)

A microscope collision protection apparatus for a remote control microscope which protects the optical and associated components from damage in the event of an uncontrolled collision with a specimen, regardless of the specimen size or shape. In a preferred embodiment, the apparatus includes a counterbalanced slide for mounting the microscope's optical components. This slide replaces the rigid mounts on conventional upright microscopes with a precision ball bearing slide. As the specimen contacts an optical component, the contacting force will move the slide and the optical components mounted thereon. This movement will protect the optical and associated components from damage as the movement causes a limit switch to be actuated, thereby stopping all motors responsible for the collision.

DeNure, Charles R. (Pocatello, ID)

2001-10-23T23:59:59.000Z

37

Infrared microscope inspection apparatus  

DOE Patents (OSTI)

Apparatus and system for inspecting infrared transparents, such as an array of photovoltaic modules containing silicon solar cells, includes an infrared microscope, at least three sources of infrared light placed around and having their axes intersect the center of the object field and means for sending the reflected light through the microscope. The apparatus is adapted to be mounted on an X-Y translator positioned adjacent the object surface. 4 figs.

Forman, S.E.; Caunt, J.W.

1985-02-26T23:59:59.000Z

38

Effective superpotential and partial breaking of N=2 supersymmetry  

E-Print Network (OSTI)

We consider the effective superpotential of N=2, U(N) gauge model where N=2 supersymmetry is spontaneously broken to N=1. By the computation of loop diagrams, we obtain a formula for the effective superpotential which is deformed from the well-known form of the effective superpotential of N=1, U(N) gauge model with a tree level superpotential.

Kazunobu Maruyoshi

2007-10-11T23:59:59.000Z

39

Spent Nuclear Fuel (SNF) Project Cask and MCO Helium Purge System Design Review Completion Report Project A.5 and A.6  

SciTech Connect

This report documents the results of the design verification performed on the Cask and Multiple Canister Over-pack (MCO) Helium Purge System. The helium purge system is part of the Spent Nuclear Fuel (SNF) Project Cask Loadout System (CLS) at 100K area. The design verification employed the ''Independent Review Method'' in accordance with Administrative Procedure (AP) EN-6-027-01.

ARD, K.E.

2000-04-19T23:59:59.000Z

40

$N=2$ Supersymmetric Integrable Models and Topological Field Theories  

E-Print Network (OSTI)

These lectures review some of the basic properties of $N=2$ superconformal field theories and the corresponding topological field theories. One of my basic aims is to show how the techniques of topological field theory can be used to compute effective \\LG potentials for perturbed $N=2$ superconformal field theories. In particular, I will briefly discuss the application of these ideas to $N=2$ supersymmetric quantum integrable models. (Lectures given at the Summer School on High Energy Physics and Cosmology, Trieste, Italy, June 15th -- July 3rd, 1992. To appear in the proceedings.)

Warner, Nicholas P

1993-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "microscope n2 purged" 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

Ion photon emission microscope  

DOE Patents (OSTI)

An ion beam analysis system that creates microscopic multidimensional image maps of the effects of high energy ions from an unfocussed source upon a sample by correlating the exact entry point of an ion into a sample by projection imaging of the ion-induced photons emitted at that point with a signal from a detector that measures the interaction of that ion within the sample. The emitted photons are collected in the lens system of a conventional optical microscope, and projected on the image plane of a high resolution single photon position sensitive detector. Position signals from this photon detector are then correlated in time with electrical effects, including the malfunction of digital circuits, detected within the sample that were caused by the individual ion that created these photons initially.

Doyle, Barney L. (Albuquerque, NM)

2003-04-22T23:59:59.000Z

42

Lepton Mixing Predictions from Delta(6n^2) Family Symmetry  

E-Print Network (OSTI)

We obtain predictions of lepton mixing parameters for direct models based on Delta(6n^2) family symmetry groups for arbitrarily large n in which the full Klein symmetry is identified as a subgroup of the family symmetry. After reviewing and developing the group theory associated with Delta(6n^2), we find many new candidates for large n able to yield reactor angle predictions within 3 sigma of recent global fits. We show that such Delta(6n^2) models with Majorana neutrinos predict trimaximal mixing with reactor angle theta_{13} fixed up to a discrete choice, an oscillation phase of either zero or pi and the atmospheric angle sum rules theta_{23}=45 degrees -/+ theta_{13}/sqrt{2}, respectively, which are consistent with recent global fits and will be tested in the near future.

King, Stephen F; Stuart, Alexander J

2013-01-01T23:59:59.000Z

43

Lepton Mixing Predictions from Delta(6n^2) Family Symmetry  

E-Print Network (OSTI)

We obtain predictions of lepton mixing parameters for direct models based on Delta(6n^2) family symmetry groups for arbitrarily large n in which the full Klein symmetry is identified as a subgroup of the family symmetry. After reviewing and developing the group theory associated with Delta(6n^2), we find many new candidates for large n able to yield reactor angle predictions within 3 sigma of recent global fits. We show that such Delta(6n^2) models with Majorana neutrinos predict trimaximal mixing with reactor angle theta_{13} fixed up to a discrete choice, an oscillation phase of either zero or pi and the atmospheric angle sum rules theta_{23}=45 degrees -/+ theta_{13}/sqrt{2}, respectively, which are consistent with recent global fits and will be tested in the near future.

Stephen F. King; Thomas Neder; Alexander J. Stuart

2013-05-14T23:59:59.000Z

44

Scanning Confocal Electron Microscope (SCEM)  

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

45

Aberration Corrected Analytical Electron Microscope  

Science Conference Proceedings (OSTI)

... resolution scanning transmission electron microscope (STEM), where ... the beam electrons as they ... filtered transmission electron microscopy (EFTEM ...

2012-10-01T23:59:59.000Z

46

Logarithmic Corrections to N=2 Black Hole Entropy: An Infrared Window into the Microstates  

E-Print Network (OSTI)

Logarithmic corrections to the extremal black hole entropy can be computed purely in terms of the low energy data -- the spectrum of massless fields and their interaction. The demand of reproducing these corrections provides a strong constraint on any microscopic theory of quantum gravity that attempts to explain the black hole entropy. Using quantum entropy function formalism we compute logarithmic corrections to the entropy of half BPS black holes in N=2 supersymmetric string theories. Our results allow us to test various proposals for the measure in the OSV formula, and we find agreement with the measure proposed by Denef and Moore if we assume their result to be valid at weak topological string coupling. Our analysis also gives the logarithmic corrections to the entropy of extremal Reissner-Nordstrom black holes in ordinary Einstein-Maxwell theory.

Ashoke Sen

2011-08-18T23:59:59.000Z

47

Measurement of Hydrogen Purge Rates in Parabolic Trough Receiver Tubes: Preprint  

SciTech Connect

The purpose of this research is to investigate and develop methods to remove hydrogen centrally from commercial parabolic trough power plants. A mathematical model was developed that tracks the generation and transport of hydrogen within an operating plant. Modeling results predicted the steady-state partial pressure of hydrogen within the receiver annuli to be ~1 torr. This result agrees with measured values for the hydrogen partial pressure. The model also predicted the rate at which hydrogen must be actively removed from the expansion tank to reduce the partial pressure of hydrogen within the receiver annuli to less than 0.001 torr. Based on these results, mitigation strategies implemented at operating parabolic trough power plants can reduce hydrogen partial pressure to acceptable levels. Transient modeling predicted the time required to reduce the hydrogen partial pressures within receiver annuli to acceptable levels. The times were estimated as a function of bellows temperature, getter quantity, and getter temperature. This work also includes an experimental effort that will determine the time required to purge hydrogen from a receiver annulus with no getter.

Glatzmaier, G. C.

2010-10-01T23:59:59.000Z

48

Solid state optical microscope  

DOE Patents (OSTI)

A solid state optical microscope wherein wide-field and high-resolution images of an object are produced at a rapid rate by utilizing conventional optics with a charge-coupled photodiode array. A galvanometer scanning mirror, for scanning in one of two orthogonal directions is provided, while the charge-coupled photodiode array scans in the other orthogonal direction. Illumination light from the object is incident upon the photodiodes, creating packets of electrons (signals) which are representative of the illuminated object. The signals are then processed, stored in a memory, and finally displayed as a video signal. 2 figs.

Young, I.T.

1983-08-09T23:59:59.000Z

49

Solid state optical microscope  

DOE Patents (OSTI)

A solid state optical microscope wherein wide-field and high-resolution images of an object are produced at a rapid rate by utilizing conventional optics with a charge-coupled photodiode array. A galvanometer scanning mirror, for scanning in one of two orthogonal directions is provided, while the charge-coupled photodiode array scans in the other orthogonal direction. Illumination light from the object is incident upon the photodiodes, creating packets of electrons (signals) which are representative of the illuminated object. The signals are then processed, stored in a memory, and finally displayed as a video signal.

Young, Ian T. (Pleasanton, CA)

1983-01-01T23:59:59.000Z

50

On Type IIA geometries dual to N = 2 SCFTs  

E-Print Network (OSTI)

We provide explicit solutions of Type IIA supergravity which are believed to be dual to N = 2 superconformal four dimensional gauge theories. These explicit solutions are based on the general ansatz for such a type of backgrounds introduced by Gaiotto and Maldacena.

R. A. Reid-Edwards; B. Stefanski jr

2010-10-31T23:59:59.000Z

51

A SEMI-INFINITE CONSTRUCTION OF UNITARY N =2 MODULES  

E-Print Network (OSTI)

We show that each unitary representation of the N = 2 superVirasoro algebra can be realized in terms of “collective excitations” over a filled Dirac sea of fermionic operators satisfying a generalized exclusion principle. These are semi-infinite forms in the modes of one of the fermionic currents. The constraints imposed on the fermionic operators have a counterpart in the form of a model one-dimensional lattice system, studying which allows us to prove the existence of a remarkable monomial basis in the semi-infinite space. This leads to a Rogers–Ramanujan-like character formula. We construct the N = 2 action on the semi-infinite space using a filtration by finite-dimensional subspaces (the structure of which is related to the supernomial coefficients); the main technical tool is provided by the dual functional realization. As an application, we identify the coinvariants with the dual to a space of meromorphic functions on products of punctured Riemann surfaces with a prescribed behaviour on multiple diagonals. For products of punctured CPą, such spaces are related to the unitary N =2 fusion algebra, for which we also give an independent derivation.

B. L. Feigin; A. M. Semikhatov; I. Yu. Tipunin

2000-01-01T23:59:59.000Z

52

Transmission electron microscope CCD camera  

DOE Patents (OSTI)

In order to improve the performance of a CCD camera on a high voltage electron microscope, an electron decelerator is inserted between the microscope column and the CCD. This arrangement optimizes the interaction of the electron beam with the scintillator of the CCD camera while retaining optimization of the microscope optics and of the interaction of the beam with the specimen. Changing the electron beam energy between the specimen and camera allows both to be optimized.

Downing, Kenneth H. (Lafayette, CA)

1999-01-01T23:59:59.000Z

53

N=2 supersymmetric gauge theories and quantum integrable systems  

E-Print Network (OSTI)

We study N=2 supersymmetric gauge theories on the product of a two-sphere and a cylinder. We show that the low-energy dynamics of a BPS sector of such a theory is described by a quantum integrable system, with the Planck constant set by the inverse of the radius of the sphere. If the sphere is replaced with a hemisphere, then our system reduces to an integrable system of the type studied by Nekrasov and Shatashvili. In this case we establish a correspondence between the effective prepotential of the gauge theory and the Yang-Yang function of the integrable system.

Yuan Luo; Meng-Chwan Tan; Junya Yagi

2013-10-02T23:59:59.000Z

54

N=2 supersymmetric gauge theories and quantum integrable systems  

E-Print Network (OSTI)

We study N=2 supersymmetric gauge theories on the product of a two-sphere and a cylinder. We show that the low-energy dynamics of a BPS sector of such a theory is described by a quantum integrable system, with the Planck constant set by the inverse of the radius of the sphere. If the sphere is replaced with a hemisphere, then our system reduces to an integrable system of the type studied by Nekrasov and Shatashvili. In this case we establish a correspondence between the effective prepotential of the gauge theory and the Yang-Yang function of the integrable system.

Luo, Yuan; Yagi, Junya

2013-01-01T23:59:59.000Z

55

Fast selection of N-2 contingencies for online security assessment  

E-Print Network (OSTI)

We propose a novel algorithm for selection of dangerous N-2 contingencies associated with line or generator failures. The algorithm is based on iterative filtering of the set of all possible double contingencies. It is certified to identify all the dangerous contingencies, and has the complexity comparable to the N-1 contingency screening. Tests performed on realistic model of Polish power grid with about 3000 buses show that only two iterations of algorithm allow one to certify the safety of 99.9% of all double contingencies, leaving only 0.1% of the most dangerous ones for direct analysis.

P. A. Kaplunovich; K. S. Turitsyn

2013-03-16T23:59:59.000Z

56

Scanning/Transmission Electron Microscopes  

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

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

57

On thermodynamic and microscopic reversibility  

SciTech Connect

The word 'reversible' has two (apparently) distinct applications in statistical thermodynamics. A thermodynamically reversible process indicates an experimental protocol for which the entropy change is zero, whereas the principle of microscopic reversibility asserts that the probability of any trajectory of a system through phase space equals that of the time reversed trajectory. However, these two terms are actually synonymous: a thermodynamically reversible process is microscopically reversible, and vice versa.

Crooks, Gavin E.

2011-07-12T23:59:59.000Z

58

HIGH TEMPERATURE MICROSCOPE AND FURNACE  

DOE Patents (OSTI)

A high-temperature microscope is offered. It has a reflecting optic situated above a molten specimen in a furnace and reflecting the image of the same downward through an inert optic member in the floor of the furnace, a plurality of spaced reflecting plane mirrors defining a reflecting path around the furnace, a standard microscope supported in the path of and forming the end terminus of the light path.

Olson, D.M.

1961-01-31T23:59:59.000Z

59

Reading Comprehension - Dissecting and Compound Microscopes  

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

Dissecting and Compound Microscopes Two types of microscopes. _________ Dissecting and Compound Microscopes Two types of microscopes. _________ Dissecting Microscope Compound Microscope _________ eyepiece focus knob light light switch objective stage _________ eyepiece focus knob light light switch objective stage _________ eyepiece focus knob light light switch objective stage _________ eyepiece focus knob light light switch objective stage _________ eyepiece focus knob light light switch objective stage _________ eyepiece focus knob light light switch objective stage _________ Dissecting Microscope Compound Microscope _________ eyepieces focus knob light light switch objective stage _________ eyepieces focus knob light light switch objective stage _________ eyepieces focus knob light light switch objective stage _________ eyepieces focus knob light

60

Microscope and method of use  

SciTech Connect

A method and apparatus for electronically focusing and electronically scanning microscopic specimens are given. In the invention, visual images of even moving, living, opaque specimens can be acoustically obtained and viewed with virtually no time needed for processing (i.e., real time processing is used). And planar samples are not required. The specimens (if planar) need not be moved during scanning, although it will be desirable and possible to move or rotate nonplanar specimens (e.g., laser fusion targets) against the lens of the apparatus. No coupling fluid is needed, so specimens need not be wetted. A phase acoustic microscope is also made from the basic microscope components together with electronic mixers.

Bongianni, Wayne L. (Los Alamos, NM)

1984-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "microscope n2 purged" 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

Formation of N2O and NO2 Across Conventional DeNOx SCR Catalysts  

Science Conference Proceedings (OSTI)

This project investigated the formation of N2O and NO2 across conventional DeNOx selective catalytic reduction (SCR) catalysts. N2O is a particularly strong greenhouse gas, and both N2O and NO2 may adversely impact downstream processes. Additional data related to their formation or reduction across SCR catalysts is desirable.

2009-12-15T23:59:59.000Z

62

NITROGEN -N2 MSDS (Document # 001040) PAGE 1 OF 10 MATERIAL SAFETY DATA SHEET  

E-Print Network (OSTI)

in an emergency? 1. PRODUCT IDENTIFICATION CHEMICAL NAME; CLASS: NITROGEN - N2 LIQUEFIED NITROGEN N2, (CryogenicNITROGEN - N2 MSDS (Document # 001040) PAGE 1 OF 10 MATERIAL SAFETY DATA SHEET Prepared to U ppm ppm ppm Nitrogen 7727-37-9 >99 % There are no specific exposure limits for Nitrogen. Nitrogen

Choi, Kyu Yong

63

The History of the Microscope  

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

the Microscope the Microscope Nature Bulletin No. 506 November 9, 1957 Forest Preserve District of Cook County Daniel Ryan, President Roberts Mann, Conservation Editor David H. Thompson, Senior Naturalist THE HISTORY OF THE MICROSCOPE During that historic period known as the Renaissance, after the "dark" Middle Ages, there occurred the inventions of printing, gunpowder and the mariner's compass, followed by the discovery of America. Equally remarkable was the invention of the microscope: an instrument that enables the human eye, by means of a lens or combinations of lenses, to observe enlarged images of tiny objects. It made visible the fascinating details of worlds within worlds. Long before, in the hazy unrecorded past, someone picked up a piece of transparent crystal thicker in the middle than at the edges, looked through it, and discovered that it made things look larger. Someone also found that such a crystal would focus the sun's rays and set fire to a piece of parchment or cloth. Magnifiers and "burning glasses" are mentioned in the writings of Seneca and Pliny the Elder, Roman philosophers during the first century A. D., but apparently they were not used much until the invention of spectacles, toward the end of the 13th century. They were named lenses because they are shaped like the seeds of a lentil.

64

Supersymmetric U(N) Gauge Model and Partial Breaking of N=2 Supersymmetry  

E-Print Network (OSTI)

We review the construction of the N=2 U(N) gauge model and the analysis of vacua of the model. On the vacua, N=2 supersymmetry is spontaneously broken to N=1, and the gauge symmetry is broken to a product gauge group \\prod_{i=1}^n U(N_i). The masses of the supermultiplets appearing on the N=1 vacua are given. We provide a manifestly N=2 supersymmetric formulation of the U(N) gauge model coupled with N=2 hypermultiplets, and show that N=2 supersymmetry is partially broken down to N=1 spontaneously.

Kazuhito Fujiwara; Hiroshi Itoyama; Makoto Sakaguchi

2006-02-25T23:59:59.000Z

65

Hyperbaric hydrothermal atomic force microscope  

SciTech Connect

A hyperbaric hydrothermal atomic force microscope (AFM) is provided to image solid surfaces in fluids, either liquid or gas, at pressures greater than normal atmospheric pressure. The sample can be heated and its surface imaged in aqueous solution at temperatures greater than 100.degree. C. with less than 1 nm vertical resolution. A gas pressurized microscope base chamber houses the stepper motor and piezoelectric scanner. A chemically inert, flexible membrane separates this base chamber from the sample cell environment and constrains a high temperature, pressurized liquid or gas in the sample cell while allowing movement of the scanner. The sample cell is designed for continuous flow of liquid or gas through the sample environment.

Knauss, Kevin G. (Livermore, CA); Boro, Carl O. (Milpitas, CA); Higgins, Steven R. (Laramie, WY); Eggleston, Carrick M. (Laramie, WY)

2002-01-01T23:59:59.000Z

66

Overview of Electron Microscope Interference  

Science Conference Proceedings (OSTI)

Power frequency magnetic fields can interfere with proper operation of electronic imaging systems. Electron microscopes are susceptible to deflection of their electron beam by an external magnetic field. This unwanted deflection can cause blurring of the image. MRI equipment is susceptible to induced voltage in the sensing coil caused by changing magnetic fields. In either case the result is degradation of the image. Magnetic field strengths that impact the images are on the same order of magnitude as th...

2010-05-28T23:59:59.000Z

67

Synthesis and Optical Properties of NuTaN2: Potential Solar Cell Applications  

Science Conference Proceedings (OSTI)

Layered CuTaN2 was synthesized by an ion exchange reaction of CuI and NaTaN2 as previously reported. Based on the results of EDX analysis, the Cu:Ta ratio of the CuTaN2 sample was 1:1 within the overall errors when examining powders of +/-10% and no Na was detected. The crystal structure and thermal stability of CuTaN2 was accurately determined by Rietveld analysis of the powder X-ray Diffraction profile and by TGA analysis, respectively. CuTaN2 crystallizes in a rhombohedral structure with space group R-3mH as shown in [figure 1]. CuTaN2 possesses a band gap of 1.53(x) eV, which is in reasonable agreement with density functional theory calculations of Cu containing nitrides. Similar materials may be even better suited for solar cell application.

Yang, M.; Zakutayev, A.; Zhang, X.; Ginley, D.; DiSalvo, F.

2013-01-01T23:59:59.000Z

68

Gas Turbine Overhaul Plan (GTOP) for 11N2, Version 1.0  

Science Conference Proceedings (OSTI)

The GTOP ALSTOM11N2SC software enables users to plan, manage, and document major overhauls of Alstom Model GT11N2 simple cycle gas turbines and electric generators. The GTOP ALSTOM11N2SC software has been developed to aid the power industry with economic and efficient planning, scheduling and execution of major overhauls of Alstom Model GT11N2 simple cycle gas turbine generator units using computer-based techniques. This Gas Turbine Overhaul Plan (GTOP) is presented in a computerized format for use with...

2007-03-08T23:59:59.000Z

69

Solid-state optical microscope  

DOE Patents (OSTI)

A solid state optical microscope is described wherein wide-field and high-resolution images of an object are produced at a rapid rate by utilizing conventional optics with a charge-coupled photodiode array. Means for scanning in one of two orthogonal directions are provided, while the charge-coupled photodiode array scans in the other orthogonal direction. Illumination light from the object is incident upon the photodiodes, creating packets of electrons (signals) which are representative of the illuminated object. The signals are then processed, stored in a memory, and finally displayed as a video signal.

Young, I.T.

1981-01-07T23:59:59.000Z

70

Laboratory Study of Premixed H2-Air and H2-N2-Air Flames in a...  

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

of Premixed H2-Air and H2-N2-Air Flames in a Low-Swirl Injector for Ultra-Low Emissions Gas Turbines Title Laboratory Study of Premixed H2-Air and H2-N2-Air Flames in a Low-Swirl...

71

RESEARCH ARTICLE Greenhouse gas emissions (CO2, CH4, and N2O) from several  

E-Print Network (OSTI)

RESEARCH ARTICLE Greenhouse gas emissions (CO2, CH4, and N2O) from several perialpine and alpine investigated greenhouse gas emissions (CO2, CH4, and N2O) from reservoirs located across an altitude gradient in Switzerland. These are the first results of greenhouse gas emissions from reservoirs at high elevations

Wehrli, Bernhard

72

Atomic force microscope: Enhanced sensitivity  

SciTech Connect

Atomic force microscopes (AFMs) are a recent development representing the state of the art in measuring ultrafine surface features. Applications are found in such fields of research as biology, microfabrication, material studies, and surface chemistry. Fiber-optic interferometer techniques developed at LLNL offer the potential of improving the vertical resolution of these instruments by up to 2 orders of magnitude. We are attempting to replace the current AFM measurement scheme, which consists of an optical beam deflection approach, with our fiber-optic interferometer scheme, a much more sensitive displacement measurement technique. In performing this research, we hope to accomplish two important goals; (1) to enhance the sensitivity of the AFM, and (2) to achieve important improvements in our fiber-optic interferometer technology.

Davis, D.T.

1995-06-01T23:59:59.000Z

73

Available Technologies: Transmission Electron Microscope Phase ...  

Robert Glaeser and Jian Jin have developed an apparatus that can be integrated into transmission electron microscopes (TEMs) to enable high contrast imaging of weak ...

74

Nanomaterials Analysis using a Scanning Electron Microscope ...  

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

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

75

NIST Physicists 'Entangle' Microscopic Drum's Beat with ...  

Science Conference Proceedings (OSTI)

... entangled” a microscopic mechanical drum with electrical signals ... Entanglement has technological uses. ... cooled" the drum to a very low energy level ...

2013-10-22T23:59:59.000Z

76

NIST's New Scanning Probe Microscope is Supercool  

Science Conference Proceedings (OSTI)

... The microscope is mounted on a 6-ton granite table (4), also supported by pneumatic isolators. The cryostat (5) is mounted ...

2011-01-03T23:59:59.000Z

77

Central Charges in Non(anti)commutative N=2 Supersymmetric U(N) Gauge Theory  

E-Print Network (OSTI)

We study the central charge of the deformed N=(1,0) supersymmetry algebra in non(anti)commutative N=2 supersymmetric U(N) gauge theory. In the cases of N=1/2 superspace and N=2 harmonic superspace with the singlet deformation, we find that the central charge is deformed by the non(anti)commutative parameters but depends on the electric and magnetic charges. For generic deformation of N=2 harmonic superspace, we compute the O(C) correction to the central charges in the case of U(1) gauge group.

Katsushi Ito; Hiroaki Nakajima

2005-11-24T23:59:59.000Z

78

Recent Results on N=2,4 Supersymmetry with Lorentz Symmetry Violating  

E-Print Network (OSTI)

In this work, we propose the N=2 and N=4 supersymmetric extensions of the Lorentz-breaking Abelian Chern-Simons term. We formulate the question of the Lorentz violation in 6 and 10 dimensions to obtain the bosonic sectors of $N=2-$ and $N=4-$ supersymmetries, respectively. From this, we carry out an analysis in N=1, D=4 superspace and, in terms of $N=1-$ superfields, we are able to write down the N=2 and N=4 supersymmetric extensions of the Lorentz-violating action term.

Wander G. Ney; J. A. Helayel-Neto; Wesley Spalenza

2005-02-26T23:59:59.000Z

79

Gas centrifuge purge method  

DOE Patents (OSTI)

1. In a method of separating isotopes in a high speed gas centrifuge wherein a vertically oriented cylindrical rotor bowl is adapted to rotate about its axis within an evacuated chamber, and wherein an annular molecular pump having an intake end and a discharge end encircles the uppermost portion of said rotor bowl, said molecular pump being attached along its periphery in a leak-tight manner to said evacuated chamber, and wherein end cap closure means are affixed to the upper end of said rotor bowl, and a process gas withdrawal and insertion system enters said bowl through said end cap closure means, said evacuated chamber, molecular pump and end cap defining an upper zone at the discharge end of said molecular pump, said evacuated chamber, molecular pump and rotor bowl defining a lower annular zone at the intake end of said molecular pump, a method for removing gases from said upper and lower zones during centrifuge operation with a minimum loss of process gas from said rotor bowl, comprising, in combination: continuously measuring the pressure in said upper zone, pumping gas from said lower zone from the time the pressure in said upper zone equals a first preselected value until the pressure in said upper zone is equal to a second preselected value, said first preselected value being greater than said second preselected value, and continuously pumping gas from said upper zone from the time the pressure in said upper zone equals a third preselected value until the pressure in said upper zone is equal to a fourth preselected value, said third preselected value being greater than said first, second and fourth preselected values.

Theurich, Gordon R. (Oak Ridge, TN)

1976-01-01T23:59:59.000Z

80

Scanning x-ray microscope  

Science Conference Proceedings (OSTI)

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

Wang, C.

1982-02-23T23:59:59.000Z

Note: This page contains sample records for the topic "microscope n2 purged" 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

N = (2, 2) Non-Linear sigma-Models: A Synopsis  

E-Print Network (OSTI)

We review N=(2,2) supersymmetric non-linear sigma-models in two dimensions and their relation to generalized Kahler and Calabi-Yau geometry. We illustrate this with an explicit non-trivial example.

Alexander Sevrin; Daniel C. Thompson

2013-05-21T23:59:59.000Z

82

A family of complete caps in PG(n,2) - CECM  

E-Print Network (OSTI)

P. Lisonek, M. Khatirinejad, A family of complete caps in PG(n,2). Designs, Codes and Cryptography 35 (2005), 259-270. We give a combinatorial construction of ...

83

Disorder-Induced Microscopic Magnetic Memory  

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

Disorder-Induced Microscopic Disorder-Induced Microscopic Magnetic Memory Disorder-Induced Microscopic Magnetic Memory Print Wednesday, 26 October 2005 00:00 The magnetic-recording industry deliberately introduces carefully controlled disorder into its materials to obtain the desired magnetic properties. But as the density of magnetic disks climbs, the size of the magnetic domains responsible for storage must decrease, posing new challenges. Beautiful theories based on random microscopic disorder have been developed over the past ten years. To directly compare these theories with precise experiments, an American-European team, led by researchers from the University of Washington, Seattle, first developed and then applied coherent x-ray speckle metrology to microscopic magnetic domains in a series of thin multilayer perpendicular magnetic materials of varying disorder. Their results, at odds with all previous theories, have set a new reference point for future theories.

84

Shock-Tube Study of Methane Ignition with NO2 and N2O  

E-Print Network (OSTI)

NOx produced during combustion can persist in the exhaust gases of a gas turbine engine in quantities significant to induce regulatory concerns. There has been much research which has led to important insights into NOx chemistry. One method of NOx reduction is exhaust gas recirculation. In exhaust gas recirculation, a portion of the exhaust gases that exit are redirected to the inlet air stream that enters the combustion chamber, along with fuel. Due to the presence of NOx in the exhaust gases which are subsequently introduced into the burner, knowledge of the effects of NOx on combustion is advantageous. Contrary to general NOx research, little has been conducted to investigate the sensitizing effects of NO2 and N2O addition to methane/oxygen combustion. Experiments were made with dilute and real fuel air mixtures of CH4/O2/Ar with the addition of NO2 and N2O. The real fuel air concentrations were made with the addition of NO2 only. The equivalence ratios of mixtures made were 0.5, 1 and 2. The experimental pressure range was 1 - 44 atm and the temperature range tested was 1177 – 2095 K. The additives NO2 and N2O were added in concentrations from 831 ppm to 3539 ppm. The results of the mixtures with NO2 have a reduction in ignition delay time across the pressure ranges tested, and the mixtures with N2O show a similar trend. At 1.3 atm, the NO2 831 ppm mixture shows a 65% reduction and shows a 75% reduction at 30 atm. The NO2 mixtures showed a higher decrease in ignition time than the N2O mixtures. The real fuel air mixture also showed a reduction. Sensitivity Analyses were performed. The two most dominant reactions in the NO2 mixtures are the reaction O+H2 = O+OH and the reaction CH3+NO2 = CH3O+NO. The presence of this second reaction is the means by which NO2 decreases ignition delay time, which is indicated in the experimental results. The reaction produces CH3O which is reactive and can participate in chain propagating reactions, speeding up ignition. The two dominant reactions for the N2O mixture are the reaction O+H2 = O+OH and, interestingly, the other dominant reaction is the reverse of the initiation reaction in the N2O-mechanism: O+N2+M = N2O+M. The reverse of this reaction is the direct oxidation of nitrous oxide. The O produced in this reaction can then speed up ignition by partaking in propagation reactions, which was experimentally observed.

Pemelton, John

2011-08-01T23:59:59.000Z

85

Model calculation of N2 Vegard-Kaplan band emissions in Martian dayglow  

E-Print Network (OSTI)

A model for N2 Vegard-Kaplan (VK) band (A^3Sigma_u^+ - X^1Sigma_g^+) emissions in Martian dayglow has been developed to explain the recent observations made by the Spectroscopy for Investigation of Characteristics of the Atmosphere of Mars (SPICAM) ultraviolet spectrograph aboard Mars Express. Steady state photoelectron fluxes and volume excitation rates have been calculated using the analytical yield spectra technique. Since interstate cascading is important for triplet states of N2, the population of any given level of N2 triplet states is calculated under statistical equilibrium considering direct excitation, cascading, and quenching effects. Relative population of all vibrational levels of each triplet state is calculated in the model. Line of sight intensities and height-integrated overhead intensities have been calculated for VK, first positive (B^3Pi_g - A^3Sigma_u^+), second positive (C^3Pi_u - B^3Pi_g), and Wu-Benesch (W^3Delta_u - B^3Pi_g) bands of N2. A reduction in the N2 density by a factor of 3 ...

Jain, Sonal Kumar

2011-01-01T23:59:59.000Z

86

Modern Records of Atmospheric Nitrous Oxide (N2O) and a 2000-year Ice-core  

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

Modern Records of Atmospheric Nitrous Oxide (N2O) and a 2000-year Ice-core Modern Records of Atmospheric Nitrous Oxide (N2O) and a 2000-year Ice-core Record from Law Dome, Antarctica Introduction This page provides an introduction and links to records of atmospheric nitrous oxide (N2O) over the last 2000 years, emphasizing large data bases each representing currently active stations. Records in recent decades (time period depending on location) have been obtained from samples of ambient-air at remote locations, which represent changing global atmospheric conditions rather than influences of local sources. The longer (2000-year) record is from the Law Dome ice core in Antarctica. The ice-core record has been merged with modern annual data from Cape Grim, Tasmania to provide a 2000-year time series of annual values. A spline function has been fit to the data to provide a continuous time series of

87

Disorder-Induced Microscopic Magnetic Memory  

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

Disorder-Induced Microscopic Magnetic Memory Print Disorder-Induced Microscopic Magnetic Memory Print The magnetic-recording industry deliberately introduces carefully controlled disorder into its materials to obtain the desired magnetic properties. But as the density of magnetic disks climbs, the size of the magnetic domains responsible for storage must decrease, posing new challenges. Beautiful theories based on random microscopic disorder have been developed over the past ten years. To directly compare these theories with precise experiments, an American-European team, led by researchers from the University of Washington, Seattle, first developed and then applied coherent x-ray speckle metrology to microscopic magnetic domains in a series of thin multilayer perpendicular magnetic materials of varying disorder. Their results, at odds with all previous theories, have set a new reference point for future theories.

88

Laser Scanning Two Photon and Confocal Microscope  

Science Conference Proceedings (OSTI)

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

2012-10-01T23:59:59.000Z

89

Disorder-Induced Microscopic Magnetic Memory  

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

Disorder-Induced Microscopic Magnetic Memory Print Disorder-Induced Microscopic Magnetic Memory Print The magnetic-recording industry deliberately introduces carefully controlled disorder into its materials to obtain the desired magnetic properties. But as the density of magnetic disks climbs, the size of the magnetic domains responsible for storage must decrease, posing new challenges. Beautiful theories based on random microscopic disorder have been developed over the past ten years. To directly compare these theories with precise experiments, an American-European team, led by researchers from the University of Washington, Seattle, first developed and then applied coherent x-ray speckle metrology to microscopic magnetic domains in a series of thin multilayer perpendicular magnetic materials of varying disorder. Their results, at odds with all previous theories, have set a new reference point for future theories.

90

Soft x-ray laser microscope  

Science Conference Proceedings (OSTI)

The program consisted of two phases (Phase I and Phase II). The goal of the Phase I (first year program) was to design and construct the Soft X-ray Laser Contact Microscope. Such microscope was constructed and adapted to PPL's 18.2nm soft X-ray Laser (SXL), which in turn was modified and prepared for microscopy experiments. Investigation of the photoresist response to 18.2nm laser radiation and transmissivity of 0.1m thick silicion-nitride (Si[sub 3]N[sub 4]) windows were important initial works. The goal of the first year of Phase II was to construct X-ray contact microscope in combination with existing optical phase microscope, already used by biologists. In the second year of Phase II study of dehydrated Horeseshoe Crab and Hela cancer cells were performed with COXRALM. Also during Phase II, the Imaging X-Ray Laser Microscope (IXRALM) was designed and constructed. This paper describes the development of each of the microscopes and their application for research.

Suckewer, P.I.

1990-10-01T23:59:59.000Z

91

NCEM National Center for Electron Microscopy: Microscopes and...  

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

I The TEAM I microscope is a double-aberration-corrected (scanning) transmission electron microscope (STEMTEM) capable of producing images with 50 pm resolution. The basic...

92

The TEAM Project: What is the TEAM microscope?  

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

What is the TEAM microscope? The TEAM project will construct a new generation electron microscope designed to incorporate aberration-correcting electron optics, to develop a common...

93

NIST Studies How New Helium Ion Microscope Measures Up  

Science Conference Proceedings (OSTI)

... are studying helium ion microscopes to improve ... analogous to the scanning electron microscope, which was ... are far larger than electrons, they can ...

2012-11-02T23:59:59.000Z

94

Instrument Series: Microscopy Environmental Transmission Electron Microscope  

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

Environmental Transmission Environmental Transmission Electron Microscope EMSL's environmental transmission electron microscope (ETEM) provides in situ capabilities that enable atomic-resolution imaging and spectroscopic studies of materials under dynamic operating conditions. In contrast to traditional operation of TEM under high vacuum, EMSL's ETEM uniquely allows imaging within high- temperature and gas environments-with a gas pressure up to 20 Torr. With a spherical aberration corrector for the objective lens, the ETEM captures atomic-level processes as they occur, enabling vital research across a range of scientific fields. Research Applications Chemical science and engineering - providing in situ observation of catalytic processes with atomic-level resolution Materials science and engineering - allowing

95

Miniature self-contained vacuum compatible electronic imaging microscope  

DOE Patents (OSTI)

A vacuum compatible CCD-based microscopic camera with an integrated illuminator. The camera can provide video or still feed from the microscope contained within a vacuum chamber. Activation of an optional integral illuminator can provide light to illuminate the microscope subject. The microscope camera comprises a housing with a objective port, modified objective, beam-splitter, CCD camera, and LED illuminator.

Naulleau, Patrick P. (Oakland, CA); Batson, Phillip J. (Alameda, CA); Denham, Paul E. (Crockett, CA); Jones, Michael S. (San Francisco, CA)

2001-01-01T23:59:59.000Z

96

Comparison Between Dust Particle Generation In CH4 or CH4/N2 Mixing RF Plasmas  

SciTech Connect

Dust particles have been spontaneously generated either in pure CH4 or in CH4/N2 r.f. plasmas. The dust particle formation results from homogeneous nucleation in the plasma and is detected by laser light scattering (Ar+, {lambda} = 514.5 nm). The temporal and spatial behaviour of dust particles is studied. In pure methane gas, particles are trapped in well defined clouds at the plasma sheath boundaries. In a CH4/N2 mixture, the nitrogen addition leads to an expansion of the clouds. For nitrogen contents higher than 50%, the space between the electrodes is nearly completely filled with dust particles leading to plasma instabilities and a void appears in the center of the discharge. The particles are spherical with diameters in the range 0.8-2 {mu}m. For nitrogen-rich plasmas, the particles growth is improved and leads to a rough shape with an orange-peel-type surface texture.

Pereira, Jeremy; Massereau-Guilbaud, Veronique; Geraud-Grenier, Isabelle; Plain, Andre [LASEP, Faculte des Sciences, Universite d'Orleans, Site de Bourges, rue G.Berger, BP 4043, 18028 Bourges Cedex (France)

2005-10-31T23:59:59.000Z

97

Mathematical Modeling to Study the Dynamics of A Diatomic Molecule N2 in Water  

E-Print Network (OSTI)

In the present work an attempt has been made to study the dynamics of a diatomic molecule N2 in water. The proposed model consists of Langevin stochastic differential equation whose solution is obtained through Euler's method. The proposed work has been concluded by studying the behavior of statistical parameters like variance in position, variance in velocity and covariance between position and velocity. This model incorporates the important parameters like acceleration, intermolecular force, frictional force and random force.

Sharma, Nitin

2010-01-01T23:59:59.000Z

98

Achieving N-2 Contingency from a Virtual Power Plant (VPP): A Consolidated Edison Case Study  

Science Conference Proceedings (OSTI)

Consolidated Edison commissioned EPRI to analyze the feasibility of a Virtual Power Plant (VPP) to enhance delivery reliability in the Jamaica service area. Currently, service can be maintained at peak demand without overloads under the loss of a single transformer (N-1). Consolidated Edison foresees benefits from increasing reliability to a higher level, N-2 reliability, but the cost of adding another transformer is high, perhaps in excess of $250 million. EPRI constructed several VPP configurations us...

2010-12-23T23:59:59.000Z

99

K-groups of the quantum homogeneous space $SU_{q}(n)/SU_{q}(n-2)$  

E-Print Network (OSTI)

Quantum Steiffel manifolds were introduced by Vainerman and Podkolzin in \\cite{VP}. They classified the irreducible representations of their underlying $C^*$-algebras. Here we compute the K groups of the quantum homogeneous spaces $SU_{q}(n)/SU_{q}(n-2), n\\ge 3$. Specializing to the case $n=3$ we show that the fundamental unitary for quantum $SU(3)$ is nontrivial and is a unimodular element in $K_1$.

Chakraborty, Partha Sarathi

2010-01-01T23:59:59.000Z

100

K-groups of the quantum homogeneous space $SU_{q}(n)/SU_{q}(n-2)$.  

E-Print Network (OSTI)

Quantum Steiffel manifolds were introduced by Vainerman and Podkolzin in \\cite{VP}. They classified the irreducible representations of their underlying $C^*$-algebras. Here we compute the K groups of the quantum homogeneous spaces $SU_{q}(n)/SU_{q}(n-2), n\\ge 3$. Specializing to the case $n=3$ we show that the fundamental unitary for quantum $SU(3)$ is nontrivial and is a unimodular element in $K_1$.

Partha Sarathi Chakraborty; S. Sundar

Note: This page contains sample records for the topic "microscope n2 purged" from the National Library of EnergyBeta (NLEBeta).
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101

Spin microscope based on optically detected magnetic resonance  

DOE Patents (OSTI)

The invention relates to scanning magnetic microscope which has a photoluminescent nanoprobe implanted in the tip apex of an atomic force microscope (AFM), a scanning tunneling microscope (STM) or a near-field scanning optical microscope (NSOM) and exhibits optically detected magnetic resonance (ODMR) in the vicinity of unpaired electron spins or nuclear magnetic moments in the sample material. The described spin microscope has demonstrated nanoscale lateral resolution and single spin sensitivity for the AFM and STM embodiments.

Berman, Gennady P. (Los Alamos, NM); Chernobrod, Boris M. (Los Alamos, NM)

2010-07-13T23:59:59.000Z

102

Spin microscope based on optically detected magnetic resonance  

Science Conference Proceedings (OSTI)

The invention relates to scanning magnetic microscope which has a photoluminescent nanoprobe implanted in the tip apex of an atomic force microscope (AFM), a scanning tunneling microscope (STM) or a near-field scanning optical microscope (NSOM) and exhibits optically detected magnetic resonance (ODMR) in the vicinity of unpaired electron spins or nuclear magnetic moments in the sample material. The described spin microscope has demonstrated nanoscale lateral resolution and single spin sensitivity for the AFM and STM embodiments.

Berman, Gennady P. (Los Alamos, NM); Chernobrod, Boris M. (Los Alamos, NM)

2009-10-27T23:59:59.000Z

103

Spin microscope based on optically detected magnetic resonance  

SciTech Connect

The invention relates to scanning magnetic microscope which has a photoluminescent nanoprobe implanted in the tip apex of an atomic force microscope (AFM), a scanning tunneling microscope (STM) or a near-field scanning optical microscope (NSOM) and exhibits optically detected magnetic resonance (ODMR) in the vicinity of unpaired electron spins or nuclear magnetic moments in the sample material. The described spin microscope has demonstrated nanoscale lateral resolution and single spin sensitivity for the AFM and STM embodiments.

Berman, Gennady P. (Los Alamos, NM); Chernobrod, Boris M. (Los Alamos, NM)

2010-06-29T23:59:59.000Z

104

Spin microscope based on optically detected magnetic resonance  

DOE Patents (OSTI)

The invention relates to scanning magnetic microscope which has a photoluminescent nanoprobe implanted in the tip apex of an atomic force microscope (AFM), a scanning tunneling microscope (STM) or a near-field scanning optical microscope (NSOM) and exhibits optically detected magnetic resonance (ODMR) in the vicinity of impaired electron spins or nuclear magnetic moments in the sample material. The described spin microscope has demonstrated nanoscale lateral resolution and single spin sensitivity for the AFM and STM embodiments.

Berman, Gennady P. (Los Alamos, NM); Chernobrod, Boris M. (Los Alamos, NM)

2009-11-10T23:59:59.000Z

105

Spin microscope based on optically detected magnetic resonance  

SciTech Connect

The invention relates to scanning magnetic microscope which has a photoluminescent nanoprobe implanted in the tip apex of an atomic force microscope (AFM), a scanning tunneling microscope (STM) or a near-field scanning optical microscope (NSOM) and exhibits optically detected magnetic resonance (ODMR) in the vicinity of unpaired electron spins or nuclear magnetic moments in the sample material. The described spin microscope has demonstrated nanoscale lateral resolution and single spin sensitivity for the AFM and STM embodiments.

Berman, Gennady P. (Los Alamos, NM); Chernobrod, Boris M. (Los Alamos, NM)

2007-12-11T23:59:59.000Z

106

Microscopic Probes of High-Temperature Superconductivity  

Science Conference Proceedings (OSTI)

The granularity of the cuprate superconductors limits the effectiveness of many experimental probes that average over volumes containing many atoms. This report presents theoretical studies on muon spin relaxation and positron annihilation, two microscopic experimental techniques that can probe the properties of both high- and low-temperature superconductors on the atomic scale.

1992-07-01T23:59:59.000Z

107

FROM THE COLOR-MAGNITUDE DIAGRAM OF {omega} CENTAURI AND (SUPER-)ASYMPTOTIC GIANT BRANCH STELLAR MODELS TO A GALACTIC PLANE PASSAGE GAS PURGING CHEMICAL EVOLUTION SCENARIO  

Science Conference Proceedings (OSTI)

We have investigated the color-magnitude diagram of {omega} Centauri and find that the blue main sequence (bMS) can be reproduced only by models that have a helium abundance in the range Y = 0.35-0.40. To explain the faint subgiant branch of the reddest stars ('MS-a/RG-a' sequence), isochrones for the observed metallicity ([Fe/H] Almost-Equal-To -0.7) appear to require both a high age ({approx}13 Gyr) and enhanced CNO abundances ([CNO/Fe] Almost-Equal-To 0.9). Y Almost-Equal-To 0.35 must also be assumed in order to counteract the effects of high CNO on turnoff colors and thereby to obtain a good fit to the relatively blue turnoff of this stellar population. This suggests a short chemical evolution period of time (=} 6.8 M{sub Sun }, M{sub He,core} {>=} 1.245 M{sub Sun }) predict too large N enhancements, which limit their role in contributing to the extreme populations. In order to address the observed central concentration of stars with He-rich abundance, we show here quantitatively that highly He- and N-enriched AGB ejecta have particularly efficient cooling properties. Based on these results and on the reconstruction of the orbit of {omega} Cen with respect to the Milky Way, we propose the Galactic plane passage gas purging scenario for the chemical evolution of this cluster. The bMS population formed shortly after the purging of most of the cluster gas as a result of the passage of {omega} Cen through the Galactic disk (which occurs today every {approx}40 Myr for {omega} Cen) when the initial mass function of the dominant population had 'burned' through most of the Type II supernova mass range. AGB stars would eject most of their masses into the gas-depleted cluster through low-velocity winds that sink to the cluster core due to their favorable cooling properties and form the bMS population. In our discussion we follow our model through four passage events, which could explain some key properties not only of the bMS but also of the MS-a/RGB-a and the s-enriched stars.

Herwig, Falk; VandenBerg, Don A.; Navarro, Julio F. [Department of Physics and Astronomy, University of Victoria, P.O. Box 3055, Victoria, BC V8W 3P6 (Canada); Ferguson, Jason [Department of Physics, Wichita State University Wichita, KS 67260 (United States); Paxton, Bill, E-mail: fherwig@uvic.ca, E-mail: vandenbe@uvic.ca, E-mail: jason.ferguson@wichita.edu, E-mail: paxton@kitp.ucsb.edu [KITP/UC Santa Barbara, Santa Barbara, CA 93106 (United States)

2012-10-01T23:59:59.000Z

108

Isotopic Analysis of N and O in Nitrite and Nitrate by Sequential Selective Bacterial Reduction to N2O  

E-Print Network (OSTI)

composition of NO2 - is linked to those of NO3 -, N2O, NH4 +, and N2 gas, the production or consumption in natural aquatic systems is poorly understood. Isotopic data can be used to study the sources independently, reproducible 15N and 18O values were obtained at both natural-abundance levels ((0.2-0.5 for 15N

109

Simulation of Stratospheric N2O in the NCAR CCM2: Comparison with CLAES Data and Global Budget Analyses  

Science Conference Proceedings (OSTI)

Global variability and budgets of stratospheric nitrous oxide (N2O) are studied using output from a stratospheric version of the NCAR Community Climate Model. The model extends over 0–80 km, incorporating an N2O-like tracer with tropospheric ...

William J. Randel; Byron A. Boville; John C. Gille; Paul L. Bailey; Steven T. Massie; J. B. Kumer; J. L. Mergenthaler; A. E. Roche

1994-10-01T23:59:59.000Z

110

The free energy of N=2 supersymmetric AdS_4 solutions of M-theory  

E-Print Network (OSTI)

We show that general N=2 supersymmetric AdS_4 solutions of M-theory with non-zero M2-brane charge admit a canonical contact structure. The free energy of the dual superconformal field theory on S^3 and the scaling dimensions of operators dual to supersymmetric wrapped M5-branes are expressed via AdS/CFT in terms of contact volumes. In particular, this leads to topological and localization formulae for the coefficient of N^{3/2} in the free energy of such solutions.

Maxime Gabella; Dario Martelli; Achilleas Passias; James Sparks

2011-07-25T23:59:59.000Z

111

A Microscopic Double-Slit Experiment  

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

A Microscopic Double-Slit A Microscopic Double-Slit Experiment A Microscopic Double-Slit Experiment Print Wednesday, 29 February 2012 00:00 Two centuries ago, Thomas Young performed the classic demonstration of the wave nature of light. He placed a screen with two tiny slits in front of a single light source, effectively converting it into a two-centered source. On a second screen far away, he saw a pattern of light and dark diffraction fringes, a well-known hallmark of wave interference. Along with later studies using particles instead of light, the experiment played a crucial role in establishing the validity of wave-particle duality, a puzzling concept that has ultimately become central to the interpretation of complementarity in quantum mechnanics. In a new twist on this classic experiment, the double slit (with light waves) has been replaced by a diatomic molecule (with electron waves). At ALS Beamline 10.0.1, researchers have shown that diatomic molecules can serve as two-center emitters of electron waves and that traces of electron-wave interference can be directly observed in precise measurements of vibrationally resolved photoionization spectra.

112

M31 PIXEL LENSING EVENT OAB-N2: A STUDY OF THE LENS PROPER MOTION  

Science Conference Proceedings (OSTI)

We present an updated analysis of the M31 pixel lensing candidate event OAB-N2 previously reported by Calchi Novati et al. Here we take advantage of new data both astrometrical and photometrical. For astrometry: using archival 4 m KPNO and Hubble Space Telescope/WFPC2 data we perform a detailed analysis of the event source whose result, although not fully conclusive on the source magnitude determination, is confirmed by the following light curve photometry analysis. For photometry: first, unpublished WeCAPP data allow us to confirm OAB-N2, previously reported only as a viable candidate, as a well-constrained pixel lensing event. Second, this photometry enables a detailed analysis in the event parameter space including the effects due to a finite source size. The combined results of these analyses allow us to put a strong lower limit on the lens proper motion. This outcome favors the MACHO lensing hypothesis over self-lensing for this individual event and points the way toward distinguishing between the MACHO and self-lensing hypotheses from larger data sets.

Calchi Novati, S.; Bozza, V.; Mancini, L.; Scarpetta, G. [Dipartimento di Fisica 'E. R. Caianiello', Universita di Salerno, Via Ponte Don Melillo, 84084 Fisciano (Italy); Dall'Ora, M. [INAF-OAC, Naples (Italy); Gould, A. [Department of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210 (United States); Bruni, I.; Gualandi, R. [INAF-OAB, Bologna (Italy); De Paolis, F.; Ingrosso, G.; Strafella, F. [Dipartimento di Fisica, Universita del Salento, Via Arnesano, 73100 Lecce (Italy); Dominik, M. [SUPA, University of St. Andrews, School of Physics and Astronomy, North Haugh, St. Andrews, KY16 9SS (United Kingdom); Jetzer, Ph. [Institute for Theoretical Physics, University of Zuerich, Winterthurerstrasse 190, 8057 Zuerich (Switzerland); Nucita, A. [XMM-Newton Science Operations Centre, ESAC, ESA, P.O. Box 78, 28691 Villanueva de la Canada, Madrid (Spain); Sereno, M. [Dipartimento di Fisica, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino (Italy)

2010-07-10T23:59:59.000Z

113

NCEM National Center for Electron Microscopy: Microscopes and...  

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

OM The One-Angstrom Microscope (OM) is a mid-voltage transmission electron microscope (TEM) capable of producing images with sub-angstrom resolution. The basic instrument is a...

114

The bioinorganic chemistry of N2S2 metal complexes: reactivity and ligating ability  

E-Print Network (OSTI)

[N,N??-bis-(mercaptoethyl)-1,5-diazacyclooctanato]NiII, Ni-1, is known to undergo metallation reactions with numerous metals. [N,N??-bis-(mercaptoethyl)-1,5-diazacycloheptanato]NiII, (bme-dach)Ni or Ni-1??, differs from Ni-1 by one less carbon in its diazacycle backbone ring producing subtle differences in N2S2Ni geometry. Metallation of Ni-1?? with PdCl2, Pd(NO3)2, and NiBr2 produced three structural forms: Ni2Pd basket, Ni4Pd2 C4-paddlewheel, and Ni3 slant chair. In attempts to provide a rationale for the heterogeneity in the active site of Acetyl coA Synthase, metal ion capture studies of Ni-1 in methanol found a qualitative ranking of metal ion preference: Zn2+ copper some 15 orders of magnitude above nickel or zinc in binding affinity. Sulfur dioxide uptake by Ni-1?? is characterized by significant color change, improved adduct solubility, and reversible binding of two equivalents of SO2. These combined properties establish Ni-1?? as a suitable model for gas uptake at nickel thiolate sites and as a possibly useful chemical sensor for this poisonous gas. Comparisons of molecular structures,? ?(SO) stretching frequencies, and thermal gravimetric analyses are made to reported adducts including the diazacyclooctane derivative, Ni-1?2SO2. Visual SO2 detection limits of Ni-1 and Ni-1?? are established at 25 ppm and 100 ppm, respectively. Structural studies of products resulting from reaction at the nucleophilic S-sites of (bme-dach)Ni and [(bme-dach)Zn]2 included acetyl chloride and sodium iodoacetate as electrophiles are shown. The acetyl group is a natural electrophile important to the citric acid cycle. Acetylation of (bme-dach)Ni produces a five coordinate, paramagnetic species. Iodoacetate is a cysteine modification agent known to inhibit enzymatic activity. The reaction of (bme-dach)Ni and sodium iodoacetate yields a blue, six coordinate nickel complex in a N2S2O2 donor environment. The bismercaptodiazacycloheptane ligand binds lead(II) forming an unprecedented structural form of N2S2M dimers, in which Pb2+ is largely bound to sulfur in a highly distorted trigonal geometry. Its unusual structure is described in comparison to other derivatives of the bme-daco ligand. The synthesis and structural characterization of square pyramidal (bme-dach)GaCl are also given and compared to the analogous (bme-daco)GaCl.

Golden, Melissa Lynn

2002-05-01T23:59:59.000Z

115

The N = 2 and N = 4 Supersymmetric Extensions of the Lorentz- and CPT-Violating Term in Abelian Gauge Theories  

E-Print Network (OSTI)

In this work, we propose the N=2 and N=4 supersymmetric extensions of the Lorentz-breaking Abelian Chern-Simons term. We formulate the question of the Lorentz violation in 6 and 10 dimensions to obtain the bosonic sectors of N=2, and N=4, supersymmetries, respectively. From this, we carry out an analysis in N=1, D=4 superspace and, in terms of N=1, superfields, we are able to write down the N=2 and N=4 supersymmetric versions of the Lorentz-violating action term.

Wander G. Ney; J. A. Helayel-Neto; Wesley Spalenza

2004-10-29T23:59:59.000Z

116

Enhanced CO2/N2 Selectivity in Amidoxime-Modified Porous Carbon  

Science Conference Proceedings (OSTI)

In this work, we examine the use of the amidoxime functional group grafted onto a hierarchical porous carbon framework for the selective capture and removal of carbon dioxide from combustion streams. Measured CO2/N2 ideal selectivity values for the amidoxime-grafted carbon were significantly higher than the pristine porous carbon with improvements of 65%. Though the overall CO2 capacity decreased slightly for the activated carbon from 4.97 mmol g-1 to 4.24 mmol g-1 after surface modification due to a reduction in the total surface area, the isosteric heats of adsorption increased after amidoxime incorporation indicating an increased interaction of CO2 with the sorbent. Total capacity was reproducible and stable after multiple adsorption/desorption cycles with no loss of capacity suggesting that modification with the amidoxime group is a potential method to enhance carbon capture.

Mahurin, Shannon Mark [ORNL] [ORNL; Gorka, Joanna [ORNL] [ORNL; Nelson, Kimberly M [ORNL] [ORNL; Mayes, Richard T [ORNL] [ORNL; Dai, Sheng [ORNL] [ORNL

2014-01-01T23:59:59.000Z

117

Acoustic microscope surface inspection system and method  

DOE Patents (OSTI)

An acoustic microscope surface inspection system and method in which pulses of high frequency electrical energy are applied to a transducer which forms and focuses acoustic energy onto a selected location on the surface of an object and receives energy from the location and generates electrical pulses. The phase of the high frequency electrical signal pulses are stepped with respected to the phase of a reference signal at said location. An output signal is generated which is indicative of the surface of said selected location. The object is scanned to provide output signals representative of the surface at a plurality of surface locations.

Khuri-Yakub, Butrus T. (Palo Alto, CA); Parent, Philippe (Chilly-Mazarin, FR); Reinholdtsen, Paul A. (Seattle, WA)

1991-01-01T23:59:59.000Z

118

Ponderomotive phase plate for transmission electron microscopes  

Science Conference Proceedings (OSTI)

A ponderomotive phase plate system and method for controllably producing highly tunable phase contrast transfer functions in a transmission electron microscope (TEM) for high resolution and biological phase contrast imaging. The system and method includes a laser source and a beam transport system to produce a focused laser crossover as a phase plate, so that a ponderomotive potential of the focused laser crossover produces a scattering-angle-dependent phase shift in the electrons of the post-sample electron beam corresponding to a desired phase contrast transfer function.

Reed, Bryan W. (Livermore, CA)

2012-07-10T23:59:59.000Z

119

Scanning tip microwave near field microscope  

SciTech Connect

A microwave near field microscope has a novel microwave probe structure wherein the probing field of evanescent radiation is emitted from a sharpened metal tip instead of an aperture or gap. This sharpened tip, which is electrically and mechanically connected to a central electrode, extends through and beyond an aperture in an endwall of a microwave resonating device such as a microwave cavity resonator or a microwave stripline resonator. Since the field intensity at the tip increases as the tip sharpens, the total energy which is radiated from the tip and absorbed by the sample increases as the tip sharpens. The result is improved spatial resolution without sacrificing sensitivity.

Xiang, Xiao-Dong (Alameda, CA); Schultz, Peter G. (Oakland, CA); Wei, Tao (Albany, CA)

1998-01-01T23:59:59.000Z

120

Turbine blade platform film cooling with simulated stator-rotor purge flow with varied seal width and upstream wake with vortex  

E-Print Network (OSTI)

The turbine blade platform can be protected from hot mainstream gases by injecting cooler air through the gap between stator and rotor. The effectiveness of this film cooling method depends on the geometry of the slot, the quantity of injected air, and the secondary flows near the platform. The purpose of this study was to measure the effect of the upstream vane or stator on this type of platform cooling, as well as the effect of changes in the width of the gap. Film cooling effectiveness distributions were obtained on a turbine blade platform within a linear cascade with upstream slot injection. The width of the slot was varied as well as the mass flow rate of the injected coolant. Obstacles were placed upstream to model the effect of the upstream vane. The coolant was injected through an advanced labyrinth seal to simulate purge flow through a stator-rotor seal. The width of the opening of this seal was varied to simulate the effect of misalignment. Stationary rods were placed upstream of the cascade in four phase locations to model the unsteady wake formed at the trailing edge of the upstream vane. Delta wings were also placed in four positions to create a vortex similar to the passage vortex at the exit of the vane. The film cooling effectiveness distributions were measured using pressure-sensitive paint (PSP). Reducing the width of the slot was found to decrease the area of coolant coverage, although the film cooling effectiveness close to the slot was slightly increased. The unsteady wake was found to have a trivial effect on platform cooling, while the passage vortex from the upstream vane may significantly reduce the film cooling effectiveness.

Blake, Sarah Anne

2007-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "microscope n2 purged" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

A Microscopic Double-Slit Experiment  

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

A Microscopic Double-Slit Experiment Print A Microscopic Double-Slit Experiment Print Two centuries ago, Thomas Young performed the classic demonstration of the wave nature of light. He placed a screen with two tiny slits in front of a single light source, effectively converting it into a two-centered source. On a second screen far away, he saw a pattern of light and dark diffraction fringes, a well-known hallmark of wave interference. Along with later studies using particles instead of light, the experiment played a crucial role in establishing the validity of wave-particle duality, a puzzling concept that has ultimately become central to the interpretation of complementarity in quantum mechnanics. In a new twist on this classic experiment, the double slit (with light waves) has been replaced by a diatomic molecule (with electron waves). At ALS Beamline 10.0.1, researchers have shown that diatomic molecules can serve as two-center emitters of electron waves and that traces of electron-wave interference can be directly observed in precise measurements of vibrationally resolved photoionization spectra.

122

A Microscopic Double-Slit Experiment  

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

A Microscopic Double-Slit Experiment Print A Microscopic Double-Slit Experiment Print Two centuries ago, Thomas Young performed the classic demonstration of the wave nature of light. He placed a screen with two tiny slits in front of a single light source, effectively converting it into a two-centered source. On a second screen far away, he saw a pattern of light and dark diffraction fringes, a well-known hallmark of wave interference. Along with later studies using particles instead of light, the experiment played a crucial role in establishing the validity of wave-particle duality, a puzzling concept that has ultimately become central to the interpretation of complementarity in quantum mechnanics. In a new twist on this classic experiment, the double slit (with light waves) has been replaced by a diatomic molecule (with electron waves). At ALS Beamline 10.0.1, researchers have shown that diatomic molecules can serve as two-center emitters of electron waves and that traces of electron-wave interference can be directly observed in precise measurements of vibrationally resolved photoionization spectra.

123

Microscopic Derivation of an Isothermal Thermodynamic Transformation  

E-Print Network (OSTI)

We obtain macroscopic isothermal thermodynamic transformations by space-time scalings of a microscopic Hamiltonian dynamics in contact with a heat bath. The microscopic dynamics is given by a chain of anharmonic oscillators subject to a varying tension (external force) and the contact with the heat bath is modeled by independent Langevin dynamics acting on each particle. After a diffusive space-time scaling and cross-graining, the profile of volume converges to the solution of a deterministic diffusive equation with boundary conditions given by the applied tension. This defines an irreversible thermodynamic transformation from an initial equilibrium to a new equilibrium given by the final tension applied. Quasi static reversible isothermal transformations are then obtained by a further time scaling. Heat is defined as the total flux of energy exchanged between the system and the heat bath. Then we prove that the relation between the limit heat, work, free energy and thermodynamic entropy agree with the first and second principle of thermodynamics.

Stefano Olla

2013-10-02T23:59:59.000Z

124

Microscopic Description of Nuclear Fission Dynamics  

E-Print Network (OSTI)

We discuss possible avenues to study fission dynamics starting from a time-dependent mean-field approach. Previous attempts to study fission dynamics using the time-dependent Hartree-Fock (TDHF) theory are analyzed. We argue that different initial conditions may be needed to describe fission dynamics depending on the specifics of the fission phenomenon and propose various approaches towards this goal. In particular, we provide preliminary calculations for studying fission following a heavy-ion reaction using TDHF with a density contraint. Regarding prompt muon-induced fission, we also suggest a new approach for combining the time-evolution of the muonic wave function with a microscopic treatment of fission dynamics via TDHF.

A. S. Umar; V. E. Oberacker; J. A. Maruhn; P. -G. Reinhard

2010-03-22T23:59:59.000Z

125

Chemical Power for Microscopic Robots in Capillaries  

E-Print Network (OSTI)

The power available to microscopic robots (nanorobots) that oxidize bloodstream glucose while aggregated in circumferential rings on capillary walls is evaluated with a numerical model using axial symmetry and time-averaged release of oxygen from passing red blood cells. Robots about one micron in size can produce up to several tens of picowatts, in steady-state, if they fully use oxygen reaching their surface from the blood plasma. Robots with pumps and tanks for onboard oxygen storage could collect oxygen to support burst power demands two to three orders of magnitude larger. We evaluate effects of oxygen depletion and local heating on surrounding tissue. These results give the power constraints when robots rely entirely on ambient available oxygen and identify aspects of the robot design significantly affecting available power. More generally, our numerical model provides an approach to evaluating robot design choices for nanomedicine treatments in and near capillaries.

Hogg, Tad

2009-01-01T23:59:59.000Z

126

Long working distance incoherent interference microscope  

DOE Patents (OSTI)

A full-field imaging, long working distance, incoherent interference microscope suitable for three-dimensional imaging and metrology of MEMS devices and test structures on a standard microelectronics probe station. A long working distance greater than 10 mm allows standard probes or probe cards to be used. This enables nanometer-scale 3-dimensional height profiles of MEMS test structures to be acquired across an entire wafer while being actively probed, and, optionally, through a transparent window. An optically identical pair of sample and reference arm objectives is not required, which reduces the overall system cost, and also the cost and time required to change sample magnifications. Using a LED source, high magnification (e.g., 50.times.) can be obtained having excellent image quality, straight fringes, and high fringe contrast.

Sinclair, Michael B. (Albuquerque, NM); De Boer, Maarten P. (Albuquerque, NM)

2006-04-25T23:59:59.000Z

127

Measurement of the 241Am (n, 2n) reaction cross section, by the activation method  

SciTech Connect

The measurement of the cross section of the reaction 241Am (n, 2n)240Am, has been performed, for the first time at neutron energies from 8.8, to 11.1MeV, by the activation method. The neutron beam was produced at the TANDEM accelerator of NCSR 'Demokritos', by the 2H (d,n)3 He reaction, using a deuterium gas target. During the 5-day long irradiation, the neutron beam fluctuations were monitored in 100 sec intervals by a BF3 counter connected with a multi-scaling unit. The radioactive target consisted of a 37GBq 241Am source enclosed in a Pb container. A natural Au foil, a 27Al foil and a 93Nb foil were used as reference materials for the neutron flux determination. After the end of the irradiation the activity induced at the target and the reference foils, was measured off-line by a 56 % HPGe detector.

Perdikakis, G. [Department of Physics, National Technical University of Athens (Greece); Institute of Nuclear Physics, NCSR ' Demokritos' , Athens (Greece); Papadopoulos, C. T.; Vlastou, R.; Kokkoris, M.; Patronis, N. [Department of Physics, National Technical University of Athens (Greece); Lagoyannis, A.; Spyrou, A.; Zarkadas, Ch.; Kalyva, G.; Kossionides, S. [Institute of Nuclear Physics, NCSR ' Demokritos' , Athens (Greece); Karamanis, D. [Department of Physics, School of Natural Sciences, University of Ioannina (Greece); Tsabaris, C. [Hellenic Centre for Marine Research, P.O. Box 712 Anavyssos (Greece)

2006-04-26T23:59:59.000Z

128

High resolution n = 3 to n = 2 spectra of neon-like silver  

Science Conference Proceedings (OSTI)

Spectra of the n = 3 to n = 2 transitions in neon-like silver emitted from the Princeton Large Torus have been recorded with a high-resolution Bragg-crystal spectrometer. The measurements cover the wavelength region 3.3 to 4.1 A and include the forbidden 3p ..-->.. 2p electric quadrupole lines. Transitions in the adjacent sodium-like, and aluminum-like charge states of silver have also been observed and identified. The Ly-..cap alpha.. spectra of hydrogen-like argon and iron, the K..cap alpha.. spectra of helium-like argon, potassium, manganese, and iron, and the K..beta.. spectrum of helium-like argon fall in the same wavelength region in first or second order and have been measured concurrently. These spectra provide a coherent set of wavelength reference data obtained with the same spectrometer and from the same tokamak. This set is used as a basis to compare wavelength predictions for one- and two-electron systems to each other and to determine the transition energies of the silver lines with great accuracy.

Beiersdorfer, P.; Bitter, M.; von Goeler, S.; Cohen, S.; Hill, K.W.; Timberlake, J.; Walling, R.S.; Chen, M.H.; Hagelstein, P.L.; Scofield, J.H.

1986-04-01T23:59:59.000Z

129

Synthesis and Characterization of Th2N2(NH) Isomorphous to Th2N3  

SciTech Connect

Using a new, low-temperature, fluoride-based process, thorium nitride imide of the chemical formula Th{sub 2}N{sub 2}(NH) was synthesized from thorium dioxide via an ammonium thorium fluoride intermediate. The resulting product phase was characterized by powder X-ray diffraction (XRD) analysis and was found to be crystallographically similar to Th{sub 2}N{sub 3}. Its unit cell was hexagonal with a space group of P3m{bar 1} and lattice parameters of a = b = 3.886(1) and c = 6.185(2) {angstrom}. The presence of -NH in the nitride phase was verified by Fourier transform infrared spectroscopy (FTIR). Total energy calculations performed using all-electron scalar relativistic density functional theory (DFT) showed that the hydrogen atom in the Th{sub 2}N{sub 2}(NH) prefers to bond with nitrogen atoms occupying 1a Wyckoff positions of the unit cell. Lattice fringe disruptions observed in nanoparticle areas of the nitride species by high-resolution transmission electron microscopic (HRTEM) images also displayed some evidence for the presence of -NH group. As ThO{sub 2} was identified as an impurity, possible reaction mechanisms involving its formation are discussed.

Silva, G W Chinthaka M [ORNL; Yeamans, Charles B. [University of California, Berkeley; Hunn, John D [ORNL; Sattelberger, Alfred P [Argonne National Laboratory (ANL); Czerwinski, Ken R. [University of Nevada, Las Vegas; Weck, Dr. Phil F [University of Nevada, Las Vegas

2012-01-01T23:59:59.000Z

130

Structures, Energetics and Spectroscopic Fingerprints of Water Clusters n = 2-24  

SciTech Connect

Water's function as a universal solvent and its role in mediating several biological functions that are responsible for sustaining life has created tremendous interest in the understanding of its structure at the molecular level.1 Due to the size of the simulation cells and the sampling time needed to compute many macroscopic properties, most of the initial simulations are performed using a classical force field whereas several processes that involve chemistry are subsequently probed with electronic structure based methods. A significant effort has therefore been devoted towards the development of classical force fields for water.2 Clusters of water molecules are useful in probing the intermolecular interactions at the microscopic level as well as providing information about the subtle energy differences that are associated with different bonding arrangements within a hydrogen bonded network. They moreover render a quantitative picture of the nature and magnitude of the various components of the intermolecular interactions such as exchange, dispersion, induction etc. They can finally serve as a vehicle for the study of the convergence of properties with increasing size.

Yoo, Soohaeng; Xantheas, Sotiris S.

2012-01-01T23:59:59.000Z

131

Five Intermediate-Period Planets from the N2K Sample  

E-Print Network (OSTI)

We report the detection of five Jovian mass planets orbiting high metallicity stars. Four of these stars were first observed as part of the N2K program and exhibited low RMS velocity scatter after three consecutive observations. However, follow-up observations over the last three years now reveal the presence of longer period planets with orbital periods ranging from 21 days to a few years. HD 11506 is a G0V star with a planet of \\msini = 4.74 \\mjup in a 3.85 year orbit. HD 17156 is a G0V star with a 3.12 \\mjup planet in a 21.2 day orbit. The eccentricity of this orbit is 0.67, one of the highest known for a planet with a relatively short period. The orbital period for this planet places it in a region of parameter space where relatively few planets have been detected. HD 125612 is a G3V star with a planet of \\msini = 3.5 \\mjup in a 1.4 year orbit. HD 170469 is a G5IV star with a planet of \\msini = 0.67 \\mjup in a 3.13 year orbit. HD 231701 is an F8V star with planet of 1.08 \\mjup in a 142 day orbit. All of these stars have supersolar metallicity. Three of the five stars were observed photometrically but showed no evidence of brightness variability. A transit search conducted for HD 17156 was negative but covered only 25% of the search space and so is not conclusive.

Debra A. Fischer; Steven S. Vogt; Geoffrey W. Marcy; R. Paul Butler; Bun'ei Sato; Gregory W. Henry; Sarah Robinson; Gregory Laughlin; Shigeru Ida; Eri Toyota; Masashi Omiya; Peter Driscoll; Genya Takeda; Jason T. Wright; John A. Johnson

2007-04-10T23:59:59.000Z

132

Preoperative Chemotherapy Versus Preoperative Chemoradiotherapy for Stage III (N2) Non-Small-Cell Lung Cancer  

Science Conference Proceedings (OSTI)

Purpose: To compare preoperative chemotherapy (ChT) and preoperative chemoradiotherapy (ChT-RT) in operable Stage III non-small-cell lung cancer. Methods and Materials: This retrospective study analyzed all patients with pathologically confirmed Stage III (N2) non-small-cell lung cancer who initiated preoperative ChT or ChT-RT at Duke University between 1995 and 2006. Mediastinal pathologic complete response (pCR) rates were compared using a chi-square test. The actuarial overall survival, disease-free survival, and local control were estimated using the Kaplan-Meier method and compared using the log-rank test. Multivariate Cox regression analysis was also performed. Results: A total of 101 patients who initiated preoperative therapy with planned resection were identified. The median follow-up was 20 months for all patients and 38 months for survivors. The mediastinal lymph nodes were reassessed after preoperative therapy in 88 patients (87%). Within this group, a mediastinal pCR was achieved in 35% after preoperative ChT vs. 65% after preoperative ChT-RT (p = 0.01). Resection was performed in 69% after ChT and 84% after ChT-RT (p = 0.1). For all patients, the overall survival, disease-free survival, and local control rate at 3 years was 40%, 27%, and 66%, respectively. No statistically significant differences were found in the clinical endpoints between the ChT and ChT-RT subgroups. On multivariate analysis, a mediastinal pCR was associated with improved disease-free survival (p = 0.03) and local control (p = 0.03), but not overall survival (p = 0.86). Conclusion: Preoperative ChT-RT was associated with higher mediastinal pCR rates but not improved survival.

Higgins, Kristin, E-mail: kristin.higgins@duke.ed [Department of Radiation Oncology, Duke University of Medical Center, Durham, NC (United States); Chino, Junzo P. [Department of Radiation Oncology, Duke University of Medical Center, Durham, NC (United States); Marks, Lawrence B. [Department of Radiation Oncology, University of North Carolina, Chapel Hill, NC (United States); Ready, Neal [Department of Medicine, Division of Medical Oncology, Duke University of Medical Center, Durham, NC (United States); D'Amico, Thomas A. [Department of Surgery, Division of Cardiovascular and Thoracic Surgery, Duke University of Medical Center, Durham, NC (United States); Clough, Robert W.; Kelsey, Chris R. [Department of Radiation Oncology, Duke University of Medical Center, Durham, NC (United States)

2009-12-01T23:59:59.000Z

133

Scanning Electron Microscope 1: Zeiss Ultra-60 FESEM  

Science Conference Proceedings (OSTI)

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

2013-05-30T23:59:59.000Z

134

The TEAM Project: Who is building the TEAM microscope?  

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

Who is building the TEAM microscope? Led by Lawrence Berkeley National Laboratory's National Center for Electron Microscopy, TEAM is an intensive collaborative project with...

135

Inelastic X-ray Scattering Reveals Microscopic Transport Properties...  

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

Inelastic X-ray Scattering Reveals Microscopic Transport Properties of Molten Aluminum Oxide The transport properties of high-temperature oxide melts are of considerable interest...

136

Benzene-derived N2-(4-hydroxyphenyl)-deoxyguanosine adduct: UvrABC incision and its conformation in DNA  

DOE Green Energy (OSTI)

Benzene, a ubiquitous human carcinogen, forms DNA adducts through its metabolites such as p-benzoquinone (p-BQ) and hydroquinone (HQ). N(2)-(4-Hydroxyphenyl)-2'-deoxyguanosine (N(2)-4-HOPh-dG) is the principal adduct identified in vivo by (32)P-postlabeling in cells or animals treated with p-BQ or HQ. To study its effect on repair specificity and replication fidelity, we recently synthesized defined oligonucleotides containing a site-specific adduct using phosphoramidite chemistry. We here report the repair of this adduct by Escherichia coli UvrABC complex, which performs the initial damage recognition and incision steps in the nucleotide excision repair (NER) pathway. We first showed that the p-BQ-treated plasmid was efficiently cleaved by the complex, indicating the formation of DNA lesions that are substrates for NER. Using a 40-mer substrate, we found that UvrABC incises the DNA strand containing N(2)-4-HOPh-dG in a dose- and time-dependent manner. The specificity of such repair was also compared with that of DNA glycosylases and damage-specific endonucleases of E. coli, both of which were found to have no detectable activity toward N(2)-4-HOPh-dG. To understand why this adduct is specifically recognized and processed by UvrABC, molecular modeling studies were performed. Analysis of molecular dynamics trajectories showed that stable G:C-like hydrogen bonding patterns of all three Watson-Crick hydrogen bonds are present within the N(2)-4-HOPh-G:C base pair, with the hydroxyphenyl ring at an almost planar position. In addition, N(2)-4-HOPh-dG has a tendency to form more stable stacking interactions than a normal G in B-type DNA. These conformational properties may be critical in differential recognition of this adduct by specific repair enzymes.

Hang, Bo; Rodriguez, Ben; Yang, Yanu; Guliaev, Anton B.; Chenna, Ahmed

2010-06-14T23:59:59.000Z

137

Ambient Measurements of the NOx Reservoir Species N2O5 using Cavity Ring-down Spectroscopy  

E-Print Network (OSTI)

The regulated control of pollutants is essential to maintaining good air quality in urban areas. A major concern is the formation of tropospheric ozone, which can be especially harmful to those with lung conditions and has been linked to the occurrence of asthma. Ozone is formed through reactions of oxidized volatile organic compounds with nitrogen oxides, and the accurate modeling of the process is necessary for smart and effective regulations. Ambient measurements are important to understanding the mechanisms involved in tropospheric chemistry. This dissertation describes the characterization of a novel instrument for the ambient measurement of dinitrogen pentoxide, N2O5, and the results of several field studies. This is an important intermediate in the major nighttime loss pathway of nitrogen oxides. The understanding of this process requires correct modeling formation, as any nitrogen oxides not removed at night will result in increased ozone formation at sunrise. Calibration studies have been performed in order to quantify the loss of reactive species within the instrument, and the sampling flow and N2O5 detection have been well characterized. The results of the laboratory measurements are presented. Results are presented from the SHARP Field Study in Houston, TX in the spring of 2009. N2O5 measurements are compared to measurements of other species, including nitric acid and nitryl chloride, which were performed by other research groups. Mixing ratios exceeding 300 ppt were observed following ozone exceedance days, and a dependence of the concentration on both wind speed and direction was noticed. There was a strong correlation determined between N2O5 with HNO3 and ClNO2 indicating both a fast heterogeneous hydrolysis and N2O5 as the primary source of the species. Observed atmospheric lifetimes for N2O5 were short, ranging from several seconds to several minutes. We have also investigated the presence of N2O5 in College Station, TX. Low mixing ratios peaking at approximately 20 ppt were observed, with longer atmospheric lifetimes of up to several hours. The role of biogenic emissions in the NO3-N2O5 equilibrium is discussed.

Geidosch, Justine Nicole

2011-08-01T23:59:59.000Z

138

Shear Viscosity Coefficient from Microscopic Models  

E-Print Network (OSTI)

The transport coefficient of shear viscosity is studied for a hadron matter through microscopic transport model, the Ultra--relativistic Quantum Molecular Dynamics (UrQMD), using the Green--Kubo formulas. Molecular--dynamical simulations are performed for a system of light mesons in a box with periodic boundary conditions. Starting from an initial state composed of $\\pi, \\eta ,\\omega ,\\rho ,\\phi$ with a uniform phase--space distribution, the evolution takes place through elastic collisions, production and annihilation. The system approaches a stationary state of mesons and their resonances, which is characterized by common temperature. After equilibration, thermodynamic quantities such as the energy density, particle density, and pressure are calculated. From such an equilibrated state the shear viscosity coefficient is calculated from the fluctuations of stress tensor around equilibrium using Green--Kubo relations. We do our simulations here at zero net baryon density so that the equilibration times depend on the energy density. We do not include hadron strings as degrees of freedom so as to maintain detailed balance. Hence we do not get the saturation of temperature but this leads to longer equilibration times.

Azwinndini Muronga

2003-09-22T23:59:59.000Z

139

Model Development for Atomic Force Microscope Stage Mechanisms  

E-Print Network (OSTI)

Model Development for Atomic Force Microscope Stage Mechanisms Ralph C. Smith and Andrew G. Hatch of the Philippines Virginia Commonwealth University Diliman, Quezon City 1101 Richmond VA 23284 rcdelros titanate (PZT) devices employed in atomic force microscope stage mechanisms. We focus specifically on PZT

140

Developing Greenhouse Gas Emissions Offsets by Reducing Nitrous Oxide (N2O) Emissions in Agricultural Crop Production  

Science Conference Proceedings (OSTI)

This final project report describes a three-year long EPRI supplemental project entitled "Developing Greenhouse Gas Emissions Offsets by Reducing Nitrous Oxide (N2O) Emissions." This EPRI-sponsored project investigated an innovative approach to developing large-scale, cost-effective greenhouse gas (GHG) emissions offsets that potentially can be implemented across broad geographic areas of the United States and internationally.

2009-12-17T23:59:59.000Z

Note: This page contains sample records for the topic "microscope n2 purged" 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

Developing Greenhouse Gas Emissions Offsets by Reducing Nitrous Oxide (N2O) Emissions in Agricultural Crop Production  

Science Conference Proceedings (OSTI)

This Technical Update covers the first year of a three-year-long EPRI research project entitled Developing Greenhouse Gas Emissions Offsets by Reducing Nitrous Oxide (N2O) Emissions in Agricultural Crop Production. The report provides a project overview and explains the preliminary results yielded from the first year of on-farm research.

2007-10-30T23:59:59.000Z

142

Effect of the Reaction N + NO ? N*2(v = 5) + O on the Production of NO by Lightning  

Science Conference Proceedings (OSTI)

The channel heating model is used to study the NO production by lightning. The reaction N+NO?N*2 (v = 5)+O is included in this model to investigate the effect on NO production. The calculations show significant changes in the NO production ...

Rajesh Kumar; Vir Singh; Jagdish Rai

1994-01-01T23:59:59.000Z

143

Simultaneous specimen and stage cleaning device for analytical electron microscope  

DOE Patents (OSTI)

An improved method and apparatus are provided for cleaning both a specimen stage, a specimen and an interior of an analytical electron microscope (AEM). The apparatus for cleaning a specimen stage and specimen comprising a plasma chamber for containing a gas plasma and an air lock coupled to the plasma chamber for permitting passage of the specimen stage and specimen into the plasma chamber and maintaining an airtight chamber. The specimen stage and specimen are subjected to a reactive plasma gas that is either DC or RF excited. The apparatus can be mounted on the analytical electron microscope (AEM) for cleaning the interior of the microscope.

Zaluzec, Nestor J. (Bolingbrook, IL)

1996-01-01T23:59:59.000Z

144

Vortex Solutions and a Novel Role for R-parity in an N=2-Supersymmetric Model for Graphene  

E-Print Network (OSTI)

In a previous work, we have been able to settle Jackiw's et al. chiral gauge theory for Dirac fermions in graphene in an N=1 supersymmetric framework, using a tau3-QED prescription, defined by means of a single pair of gauge charged superfields, but without preserving a global phase symmetry associated to the electric charge. In the present work, we propose another N=1-generalisation which indeed preserves this symmetry, namely, a straightforward extension built upon a set of two pairs of (chiral) gauge-charged superfields plus an extra pair of electrically neutral superfields. We then further proceed to establish, via a dimensional reduction procedure, an N=2 extension, allowing for the identification of non-perturbative features, as we put forward Bogomol'nyi equations and obtain vortex-like solutions saturating a topologically non-trivial bound. Remarkably, the bosonic projection of the N=2 functional space onto the saturated regime analysed herewith reveals to be free from extra scalar degrees of freedom that would otherwise demand a phenomenological interpretation. The investigation of Jackiw's model within an N=2 complex superspace is also motivated by the assumption that an R-parity-like symmetry could provide a route to incorporate the global phase-fermion number invariance as an external-like symmetry of the theory, thus associating the electric charge in graphene to the complex covariance (super-)space for the N=2-D=3 setup. We prove such a hypothesis to be realisable, as we build up the model endowed with all the symmetries required to further extend Jackiw's chiral gauge theory.

Everton M. C. Abreu; Marco A. De Andrade; Leonardo P. G. De Assis; José A. Helayël-Neto; A. L. M. A. Nogueira; Ricardo C. Paschoal

2013-08-09T23:59:59.000Z

145

Developing Greenhouse Gas Emissions Offsets by Reducing Nitrous Oxide (N2O) Emissions in Agricultural Crop Production  

Science Conference Proceedings (OSTI)

This report covers the first two years of a three-year long project entitled "Developing Greenhouse Gas Emissions Offsets by Reducing Nitrous Oxide (N2O) Emissions." This EPRI-sponsored project is investigating an innovative approach to developing large-scale and potentially cost-effective greenhouse gas (GHG) emissions offsets that could be implemented across broad geographic areas of the U.S. and internationally. The tools and information developed in this project will broaden the GHG emissions offset ...

2008-11-11T23:59:59.000Z

146

Evidence of N2-Ice On the Surface of the Icy Dwarf Planet 136472 (2005 FY9)  

E-Print Network (OSTI)

We present high signal precision optical reflectance spectra of 2005 FY9 taken with the Red Channel Spectrograph and the 6.5-m MMT telescope on 2006 March 4 UT (5000 - 9500 A; 6.33 A pixel-1) and 2007 February 12 UT (6600 - 8500 A; 1.93 A pixel-1). From cross correlation experiments between the 2006 March 4 spectrum and a pure CH4-ice Hapke model, we find the CH4-ice bands in the MMT spectrum are blueshifted by 3 +/- 4 A relative to bands in the pure CH4-ice Hapke spectrum. The higher resolution MMT spectrum of 2007 February 12 UT enabled us to measure shifts of individual CH4-ice bands. We find the 7296 A, 7862 A, and 7993 A CH4-ice bands are blueshifted by 4 +/- 2 A, 4 +/- 4 A, and 6 +/- 5 A. From four measurements we report here and one of our previously published measurements, we find the CH4-ice bands are shifted by 4 +/- 1 A. This small shift is important because it suggest the presence of another ice component on the surface of 2005 FY9. Laboratory experiments show that CH4-ice bands in spectra of CH4 mixed with other ices are blueshifted relative to bands in spectra of pure CH4-ice. A likely candidate for the other component is N2-ice because its weak 2.15 micron band and blueshifted CH4 bands are seen in spectra of Triton and Pluto. Assuming the shift is due to the presence of N2, spectra taken on two consecutive nights show no difference in CH4/N2. In addition, we find no measureable difference in CH4/N2 at different depths into the surface of 2005 FY9.

S. C. Tegler; W. M. Grundy; F. Vilas; W. Romanishin; D. Cornelison; G. J. Consolmagno

2008-01-21T23:59:59.000Z

147

NCEM National Center for Electron Microscopy: Microscopes and Facilities:  

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

0.5 0.5 The TEAM 0.5 microscope is a double-aberration-corrected (scanning) transmission electron microscope (STEM/TEM) capable of producing images with 50 pm resolution. The basic instrument is a modified FEI Titan 80-300 microscope equipped with a special high-brightness Schottky-field emission electron source, a gun monochromator, a high-resolution GIF Tridiem energy-filter, and two CEOS hexapole-type spherical aberration correctors. The illumination aberration corrector corrects coherent axial aberrations up to 4th order, as well as 5th order spherical aberration and six-fold astigmatism. The imaging aberration corrector fully corrects for coherent axial aberrations up to 3rd order and partially compensates for 4th and 5th order aberrations. The microscope has two 2048x2048 slow-scan CCD

148

Simulation and characterization of a miniaturized Scanning Electron Microscope  

Science Conference Proceedings (OSTI)

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

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

2011-03-01T23:59:59.000Z

149

Microscopic Analysis of Agricultural Products, 4th Edition  

Science Conference Proceedings (OSTI)

Written for both production staff who need advice on specific problems and development personnel who seek directions. Microscopic Analysis of Agricultural Products, 4th Edition Methods and Analyses Methods - Analyses Books Soft Bound Books Methods - An

150

Geometry-driven visualization of microscopic structures in biology  

Science Conference Proceedings (OSTI)

At a microscopic resolution, biological structures are composed of cells, red blood corpuscles (RBCs), cytoplasm and other microstructural components. There is a natural pattern in terms of distribution, arrangement and packing density of these components ...

Kishore Mosaliganti; Raghu Machiraju; Kun Huang; Gustavo Leone

2008-05-01T23:59:59.000Z

151

Determination of the cross sections of (n,2n), (n,gamma) nuclear reactions on germanium isotopes at the energy of neutrons 13.96 MeV  

E-Print Network (OSTI)

The cross sections of 70Ge(n,2n)69Ge, 72Ge(n,2n)71Ge, 76Ge(n,gamma)77(g+0.21m)Ge, 76Ge(n,2n)75Ge nuclear reactions were measured at the energy of neutrons 13.96(6) MeV by activation method with gamma-ray and X-ray spectra studies.

S. V. Begun; O. G. Druzheruchenko; O. O. Pupirina; V. K. Tarakanov

2007-01-23T23:59:59.000Z

152

Impact of air-exposure on the chemical and electronic structure ofZnO:Zn3N2 thin films  

SciTech Connect

The chemical and electronic surface structure of ZnO:Zn3N2 ("ZnO:N") thin films with different N contents was investigated by soft x-ray emission spectroscopy. Upon exposure to ambient air (in contrast to storage in vacuum), the chemical and electronic surface structure of the ZnO:N films changes substantially. In particular, we find that the Zn3N2/(Zn3N2+ZnO) ratio decreases with exposure time and that this change depends on the initial N content. We suggest a degradation mechanism based on the reaction of the Zn3N2 content with atmospheric humidity.

Bar, M.; Ahn, K.-S.; Shet, S.; Yan, Y.; Weinhardt, L.; Fuchs, O.; Blum, M.; Pookpanratana, S.; George, K.; Yang, W.; Denlinger, J.D.; Al-Jassim, M.; Heske, C.

2008-09-08T23:59:59.000Z

153

N2s2 chelating agents as cys-x-cys biomimics for fe(no) and fe(no)2 complexes  

E-Print Network (OSTI)

Nitric oxide plays an important role in many biological functions. A metallo derivative in biological systems is a protein-bound dinitrosyl iron complex (DNIC), which results from iron-sulfur cluster degradation in the presence of excess NO. Through model complexes I have examined the fundamental properties of a dithiolato-Fe(NO)2 complex, bismercaptoethandiazacyclooctane iron dinitrosyl or (H+bme-daco)Fe(NO)2 as a biomimic of dicysteinate coordination of [Fe(NO)2]. This complex was prepared and fully characterized in my studies. The DNIC moiety is in its oxidized state, {Fe(NO)2}9. Through reaction studies, monitored by IR spectroscopy (H+N2S2)Fe(NO)2 (N2S2 = bme-dach. Bme-pda) has been shown to transfer NO to FeIII in (TPP)FeCl (TPP = meso-tetraphenylporphyrin) as NO-. The remaining mononitrosyl converts into complex (N2S2)Fe(NO). The (N2S2)Fe(NO) complexes (N2S2 = bme-daco, bme*-daco, bme-dach) were prepared by direct reaction of dimeric [(N2S2)Fe]2 and NO gas. The analogous (N2S2)Co(NO) complex (N2S2 = bme-dach) has also been prepared. The series of square pyramidal (N2S2)M(NO) have been studied by cyclic voltammetry and ?(NO) IR spectroscopy.

Chiang, Chao-Yi

2003-05-01T23:59:59.000Z

154

Soft x-ray laser microscope. Final report  

Science Conference Proceedings (OSTI)

The program consisted of two phases (Phase I and Phase II). The goal of the Phase I (first year program) was to design and construct the Soft X-ray Laser Contact Microscope. Such microscope was constructed and adapted to PPL`s 18.2nm soft X-ray Laser (SXL), which in turn was modified and prepared for microscopy experiments. Investigation of the photoresist response to 18.2nm laser radiation and transmissivity of 0.1m thick silicion-nitride (Si{sub 3}N{sub 4}) windows were important initial works. The goal of the first year of Phase II was to construct X-ray contact microscope in combination with existing optical phase microscope, already used by biologists. In the second year of Phase II study of dehydrated Horeseshoe Crab and Hela cancer cells were performed with COXRALM. Also during Phase II, the Imaging X-Ray Laser Microscope (IXRALM) was designed and constructed. This paper describes the development of each of the microscopes and their application for research.

Suckewer, P.I.

1990-10-01T23:59:59.000Z

155

Probing the Vibrational Relaxation of N2 and O2 by Use of CARS Spectroscopy to Model NTE-Turbulence  

E-Print Network (OSTI)

The thermochemical dynamics associated with hypersonic flight and turbulent flow is vital to understanding the effects that hypersonic turbulence has on objects or vehicles traveling at speeds above Mach 5 (~ 1708 m/s). Non-thermochemical equilibrium (NTE) exists downstream of strong shock fronts and encountered in the shear layers from hypersonic flight, and coupled with turbulence, it has significant effects on flow dynamics. NTE, characterized by high vibrational temperatures of N2 and O2, was observed, and the relaxation processes were measured to obtain time-resolved results. By inducing cold-flow NTE via RF-plasma, species in the flow were probed to determine specific vibrational temperatures at particular distances and times following initial NTE-preparation. The detection technique used in the experiment was coherent anti-Stokes Raman spectroscopy (CARS) and variations of this laser-based technique were optimized to maximize accuracy and signal-to-noise in the vibrational relaxation measurements. It was found that the boxCARS variant was most successful in probing the v=1 --> v=0 vibrational transition associated with the measurement. Also a dual pump-beam CARS setup enabled the probing of both N2 and O2 simultaneously; however, in this report only N2 vibrational relaxation was modeled because the lifetime of vibrationally-excited (v=1) O2 was too short and the O2 vibrational temperature was too low to model. The CARS spectra were obtained in a subsonic wind tunnel with a flow velocity of approximately 30 m/s and probing distances from 4.4-39.4 cm downstream the plasma. Five averaged vibrational temperature values were determined and they yielded a decay from 1882 ± 46 K (4.4 cm from plasma) to 1010 ± 16 K (39.4 cm from plasma) showing the relative rate of vibrational relaxation of N2. The vibrational relaxation was also modeled as a function of time after passing through the plasma, and a kinetic simulation was fit to the results. The spectral decay of the v=1 peak relative to v=0 (Iv=1/Iv=0) was found and compared to the decay of the vibrational temperature. Data analysis revealed that the results were in agreement with theory and the observed vibrational relaxation of N2 fit the simulated kinetic model accurately.

Dean, Jacob

2009-06-09T23:59:59.000Z

156

Getting the Point: Real-Time Monitoring of Atomic-Microscope ...  

Science Conference Proceedings (OSTI)

... done with atomic force microscopy (AFM). ... small scales, so researchers use atomic force microscopes. ... of the tip with an electron microscope, a time ...

2012-10-15T23:59:59.000Z

157

Lattice formulation of 2D $\\mathcal{N}=(2,2)$ SQCD based on the B model twist  

E-Print Network (OSTI)

We present a simple lattice formulation of two-dimensional $\\mathcal{N}=(2,2)$ $U(k)$ supersymmetric QCD (SQCD) with $N$ matter multiplets in the fundamental representation. The construction uses compact gauge link variables and exactly preserves one linear combination of supercharges on the two-dimensional regular lattice. Artificial saddle points in the weak coupling limit and the species doubling are evaded without imposing the admissibility. A perturbative power-counting argument indicates that the target supersymmetric theory is realized in the continuum limit without any fine tuning.

Daisuke Kadoh; Fumihiko Sugino; Hiroshi Suzuki

2009-03-31T23:59:59.000Z

158

NCEM National Center for Electron Microscopy: Microscope Driving...  

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

Microscope Driving Tests 3010 test.pdf CM 200 test.pdf CM 300 test.pdf Libra test.pdf FIB test.pdf Tecnai test.pdf TEAM 0.5 test.pdf TEAM I test.pdf...

159

Laser excited confocal microscope fluorescence scanner and method  

DOE Patents (OSTI)

A fluorescent scanner for scanning the fluorescence from a fluorescence labeled separated sample on a sample carrier including a confocal microscope for illuminating a predetermined volume of the sample carrier and/or receiving and processing fluorescence emissions from said volume to provide a display of the separated sample.

Mathies, Richard A. (Contra Costa, CA); Peck, Konan (Contra Costa, CA)

1992-01-01T23:59:59.000Z

160

Malaria Parasite Detection: Automated Method Using Microscope Color Image  

Science Conference Proceedings (OSTI)

Healthcare Delivery Systems are becoming overloaded in developing countries like India and China. It is imperative that more efficient and cost effective processes are employed. One such requirement is the automatic detection of malaria parasites in ... Keywords: Hue-Saturation-Intensity-Histogram, Image Segmentation, Malaria Parasites, Microscopic Image Analysis, ROI

Anant R. Koppar; Venugopalachar Sridhar

2011-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "microscope n2 purged" 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

Dynamic microscopic theory of fusion using DC-TDHF  

Science Conference Proceedings (OSTI)

The density-constrained time-dependent Hartree-Fock (DC-TDHF) theory is a fully microscopic approach for calculating heavy-ion interaction potentials and fusion cross sections below and above the fusion barrier. We discuss recent applications of DC-TDHF method to fusion of light and heavy systems.

Umar, A. S.; Oberacker, V. E.; Keser, R.; Maruhn, J. A.; Reinhard, P.-G. [Department of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235 (United States); RTE University, Science and Arts Faculty, Department of Physics, 53100, Rize (Turkey); Institut fuer Theoretische Physik, Goethe-Universitaet, D-60438 Frankfurt am Main (Germany); Institut fur Theoretische Physik, Universitat Erlangen, D-91054 Erlangen (Germany)

2012-10-20T23:59:59.000Z

162

Microscopic Calculation of Fusion: Light to Heavy Systems  

E-Print Network (OSTI)

The density-constrained time-dependent Hartree-Fock (DC-TDHF) theory is a fully microscopic approach for calculating heavy-ion interaction potentials and fusion cross sections below and above the fusion barrier. We discuss recent applications of DC-TDHF method to fusion of light and heavy neutron-rich systems.

A. S. Umar; V. E. Oberacker; J. A. Maruhn; R. Keser

2013-10-02T23:59:59.000Z

163

Measurement of the {sup 241}Am(n,2n) reaction cross section using the activation method  

SciTech Connect

In the context of the n{sub T}OF Collaboration, the measurement of the cross section of the reaction {sup 241}Am(n,2n){sup 240}Am, has been performed, for the first time at neutron energies from 8.8 to 11.4 MeV, by the activation method, relative to the {sup 27}Al(n,a){sup 24}Na reaction reference cross section. The monoenergetic neutron beam was produced at the 5.5 MV TANDEM accelerator of NCSR ''Demokritos,'' by means of the {sup 2}H(d,n){sup 3}He reaction, using a deuterium filled gas cell. The radioactive target consisted of a 37 GBq {sup 241}Am source enclosed in a Pb container. After the end of the irradiation, the activity induced by the neutron beam at the target and reference, was measured off-line by a 56% relative efficiency, HPGe detector.

Perdikakis, G. [Department of Physics, National Technical University of Athens, Athens (Greece); Institute of Nuclear Physics, NCSR ' Demokritos' , Athens (Greece); Papadopoulos, C.T.; Vlastou, R.; Kokkoris, M.; Galanopoulos, S.; Patronis, N. [Department of Physics, National Technical University of Athens, Athens (Greece); Lagoyannis, A.; Spyrou, A.; Zarkadas, Ch.; Kalyva, G.; Kossionides, S. [Institute of Nuclear Physics, NCSR ' ' Demokritos, Athens (Greece); Karamanis, D. [Department of Physics, University of Ioannina, Ioannina (Greece)

2006-06-15T23:59:59.000Z

164

Effects of EGR, water/N2/CO2 injection and oxygen enrichment on the availability destroyed due to combustion for a range of conditions and fuels.  

E-Print Network (OSTI)

??This study was directed at examining the effects of exhaust gas recirculation (EGR), water/N2/CO2 injections and oxygen enrichment on availability destroyed because of combustion in… (more)

Sivadas, Hari Shanker

2009-01-01T23:59:59.000Z

165

NCEM National Center for Electron Microscopy: Microscopes and Facilities:  

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

AEM AEM AEME The Analytical Electron Microscope is optimized for elemental microanalysis. The basic instrument is a JEOL 200CX microscope with a side-entry double-tilt goniometer stage and an assortment of specimen holders. This machine can be operated at between 80 and 200 kV in the TEM or STEM mode. Electron energy loss and x-ray signals for elemental microanalysis or spectral imaging can be collected either separately or simultaneously using probe diameters from 6nm to 100nm. Diffraction modes include convergent beam diffraction for three-dimensional structure information and micro-diffraction with a minimum probe size of 20nm. For updates or details, contact Zonghoon Lee or Velimir Radmilovic. The instrument is equipped with two Kevex EDXS detectors and a Gatan PEELS

166

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

167

NCEM National Center for Electron Microscopy: Microscopes and Facilities:  

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

LIBRA LIBRA The 200kV Zeiss monochromated LIBRA 200MC is designed to produce high contrast imaging for TEM and STEM and either convergent beam or parallel beam diffraction using Koehler illumination.In addition, the incorporation of a monochromator into the field emission gun enables energy resolution of ~0.15eV for electron energy loss spectroscopy. The dedicated in-column Omega Filter implemented in this microscope also can be used for both spectroscopic analysis and energy-filtered imaging with a 2048x2048 CCD camera. The high tilt capability of the stage and pole piece accepts various types of analytical holders.This microscope is optimized for soft materials applications that require either the high contrast imaging performance or analytical methods such as EF-TEM and STEM.( Instrument

168

Regular Scanning Tunneling Microscope Tips can be Intrinsically Chiral  

Science Conference Proceedings (OSTI)

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

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

2011-01-07T23:59:59.000Z

169

In-situ monitoring of electron beam induced deposition by atomic force microscopy in a scanning electron microscope  

Science Conference Proceedings (OSTI)

A new type of atomic force microscope is proposed for atomic force microscopic analysis inside a scanning electron microscope. We attached a piezoresisitive atomic force microscopic cantilever to a micro manipulator to achieve a compact and guidable ... Keywords: atomic force, electron beam induced deposition, in-situ monitoring, local gas injection, micro manipulator, microscope

S. Bauerdick; C. Burkhardt; R. Rudorf; W. Barth; V. Bucher; W. Nisch

2003-06-01T23:59:59.000Z

170

Refined tip preparation by electrochemical etching and ultrahigh vacuum treatment to obtain atomically sharp tips for scanning tunneling microscope and atomic force microscope  

SciTech Connect

A modification of the common electrochemical etching setup is presented. The described method reproducibly yields sharp tungsten tips for usage in the scanning tunneling microscope and tuning fork atomic force microscope. In situ treatment under ultrahigh vacuum (p {<=}10{sup -10} mbar) conditions for cleaning and fine sharpening with minimal blunting is described. The structure of the microscopic apex of these tips is atomically resolved with field ion microscopy and cross checked with field emission.

Hagedorn, Till; Ouali, Mehdi El; Paul, William; Oliver, David; Miyahara, Yoichi; Gruetter, Peter [Department of Physics, McGill University, 3600 Rue University, Montreal, QC H3A2T8 (Canada)

2011-11-15T23:59:59.000Z

171

The N2K Consortium VI: Doppler Shifts Without Templates and Three New Short-Period Planets  

E-Print Network (OSTI)

We present a modification to the iodine cell Doppler technique that eliminates the need for an observed stellar template spectrum. For a given target star, we iterate toward a synthetic template spectrum beginning with an existing spectrum of a similar star. We then perturb the shape of this first-guess template to match the program observation of the target star taken through an iodine cell. The elimination of a separate template observation saves valuable telescope time, a feature that is ideally suited for the quick-look strategy employed by the ``Next 2000 Stars'' (N2K) planet search program. Tests using Keck/HIRES spectra indicate that synthetic templates yield a short-term precision of 3 m/s and a long-term, run-to-run precision of 5 m/s. We used this new Doppler technique to discover three new planets: a 1.5 Mjup planet in a 2.1375 d orbit around HD 86081; a 0.71 Mjup planet in circular, 26.73 d orbit around HD 224693; and a Saturn-mass planet in an 18.179 d orbit around HD 33283. The remarkably short period of HD 86081b bridges the gap between the extremely short-period planets detected in the OGLE survey and the 16 Doppler-detected hot jupiters (P < 15 d), which have an orbital period distribution that piles up at about three days. We have acquired photometric observations of two of the planetary host stars with the automated photometric telescopes at Fairborn Observatory. HD 86081 and HD 224693 both lack detectable brightness variability on their radial velocity periods, supporting planetary-reflex motion as the cause of the radial velocity variability. HD 86081 shows no evidence of planetary transits in spite of a 17.6% transit probability.

John A. Johnson; Geoffrey W. Marcy; Debra A. Fischer; Gregory Laughlin; R. Paul Butler; Gregory W. Henry; Jeff A. Valenti; Eric B. Ford; Steven S. Vogt; Jason T. Wright

2006-04-17T23:59:59.000Z

172

Underwater microscope for measuring spatial and temporal changes in bed-sediment grain size  

E-Print Network (OSTI)

Underwater microscope for measuring spatial and temporal changes in bed-sediment grain size David M by Elsevier B.V. Keywords: Underwater microscope; Bed sediment; Grain size; In situ measurement; Colorado counts on a small subset of processed images. 2.3. Underwater microscope hardware Digital images of bed

173

Beamline 5.4.1  

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

5.4.1 5.4.1 Beamline 5.4.1 Print Infrared spectromicroscopy GENERAL BEAMLINE INFORMATION Operational 2011 Source characteristics Bend magnet Energy range 0.07-1.25 eV Frequency range 600 - 10,000 cm-1 Interferometer resolution 0.125 cm-1 Endstations FTIR bench and IR microscope (N2 purged) Characteristics Computerized sample stage, 0.1-micron resolution; reflection, transmission, and attenuated total reflectance (ATR) modes; polarizing and UV fluorescence optics Spatial resolution Diffraction limited (~wavelength) Detectors Probably MCT-A*, MCT-B (mercury cadmium telluride) Spot size at sample 2-10 µm (diffraction-limited) Sample preparation Biological preparation equipment available including incubator, biohoods, prep table, and more TBD. Sample environment N2 purged, minimal clean area (no particle specification), microcryostat/heater stages available for 4.2-730 K

174

Beamline 5.4.1  

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

1 Print 1 Print Infrared spectromicroscopy GENERAL BEAMLINE INFORMATION Operational 2011 Source characteristics Bend magnet Energy range 0.07-1.25 eV Frequency range 600 - 10,000 cm-1 Interferometer resolution 0.125 cm-1 Endstations FTIR bench and IR microscope (N2 purged) Characteristics Computerized sample stage, 0.1-micron resolution; reflection, transmission, and attenuated total reflectance (ATR) modes; polarizing and UV fluorescence optics Spatial resolution Diffraction limited (~wavelength) Detectors Probably MCT-A*, MCT-B (mercury cadmium telluride) Spot size at sample 2-10 µm (diffraction-limited) Sample preparation Biological preparation equipment available including incubator, biohoods, prep table, and more TBD. Sample environment N2 purged, minimal clean area (no particle specification), microcryostat/heater stages available for 4.2-730 K

175

Beamline 5.4.1  

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

1 Print 1 Print Infrared spectromicroscopy GENERAL BEAMLINE INFORMATION Operational 2011 Source characteristics Bend magnet Energy range 0.07-1.25 eV Frequency range 600 - 10,000 cm-1 Interferometer resolution 0.125 cm-1 Endstations FTIR bench and IR microscope (N2 purged) Characteristics Computerized sample stage, 0.1-micron resolution; reflection, transmission, and attenuated total reflectance (ATR) modes; polarizing and UV fluorescence optics Spatial resolution Diffraction limited (~wavelength) Detectors Probably MCT-A*, MCT-B (mercury cadmium telluride) Spot size at sample 2-10 µm (diffraction-limited) Sample preparation Biological preparation equipment available including incubator, biohoods, prep table, and more TBD. Sample environment N2 purged, minimal clean area (no particle specification), microcryostat/heater stages available for 4.2-730 K

176

Beamline 5.4.1  

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

1 Print 1 Print Infrared spectromicroscopy GENERAL BEAMLINE INFORMATION Operational 2011 Source characteristics Bend magnet Energy range 0.07-1.25 eV Frequency range 600 - 10,000 cm-1 Interferometer resolution 0.125 cm-1 Endstations FTIR bench and IR microscope (N2 purged) Characteristics Computerized sample stage, 0.1-micron resolution; reflection, transmission, and attenuated total reflectance (ATR) modes; polarizing and UV fluorescence optics Spatial resolution Diffraction limited (~wavelength) Detectors Probably MCT-A*, MCT-B (mercury cadmium telluride) Spot size at sample 2-10 µm (diffraction-limited) Sample preparation Biological preparation equipment available including incubator, biohoods, prep table, and more TBD. Sample environment N2 purged, minimal clean area (no particle specification), microcryostat/heater stages available for 4.2-730 K

177

Beamline 5.4.1  

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

1 Print 1 Print Infrared spectromicroscopy GENERAL BEAMLINE INFORMATION Operational 2011 Source characteristics Bend magnet Energy range 0.07-1.25 eV Frequency range 600 - 10,000 cm-1 Interferometer resolution 0.125 cm-1 Endstations FTIR bench and IR microscope (N2 purged) Characteristics Computerized sample stage, 0.1-micron resolution; reflection, transmission, and attenuated total reflectance (ATR) modes; polarizing and UV fluorescence optics Spatial resolution Diffraction limited (~wavelength) Detectors Probably MCT-A*, MCT-B (mercury cadmium telluride) Spot size at sample 2-10 µm (diffraction-limited) Sample preparation Biological preparation equipment available including incubator, biohoods, prep table, and more TBD. Sample environment N2 purged, minimal clean area (no particle specification), microcryostat/heater stages available for 4.2-730 K

178

Beamline 5.4.1  

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

1 Print 1 Print Infrared spectromicroscopy GENERAL BEAMLINE INFORMATION Operational 2011 Source characteristics Bend magnet Energy range 0.07-1.25 eV Frequency range 600 - 10,000 cm-1 Interferometer resolution 0.125 cm-1 Endstations FTIR bench and IR microscope (N2 purged) Characteristics Computerized sample stage, 0.1-micron resolution; reflection, transmission, and attenuated total reflectance (ATR) modes; polarizing and UV fluorescence optics Spatial resolution Diffraction limited (~wavelength) Detectors Probably MCT-A*, MCT-B (mercury cadmium telluride) Spot size at sample 2-10 µm (diffraction-limited) Sample preparation Biological preparation equipment available including incubator, biohoods, prep table, and more TBD. Sample environment N2 purged, minimal clean area (no particle specification), microcryostat/heater stages available for 4.2-730 K

179

Foucault imaging by using non-dedicated transmission electron microscope  

Science Conference Proceedings (OSTI)

An electron optical system for observing Foucault images was constructed using a conventional transmission electron microscope without any special equipment for Lorentz microscopy. The objective lens was switched off and an electron beam was converged by a condenser optical system to the crossover on the selected area aperture plane. The selected area aperture was used as an objective aperture to select the deflected beam for Foucault mode, and the successive image-forming lenses were controlled for observation of the specimen images. The irradiation area on the specimen was controlled by selecting the appropriate diameter of the condenser aperture.

Taniguchi, Yoshifumi [Science and Medical Systems Business Group, Hitachi High-Technologies Corp., Ichige, Hitachinaka, Ibaraki 312-8504 (Japan); Matsumoto, Hiroaki [Corporate Manufacturing Strategy Group, Hitachi High-Technologies Corp., Ishikawa-cho, Hitachinaka, Ibaraki 312-1991 (Japan); Harada, Ken [Central Research Laboratory, Hitachi Ltd., Hatoyama, Saitama 350-0395 (Japan)

2012-08-27T23:59:59.000Z

180

Pulsed Power for a Dynamic Transmission Electron Microscope  

Science Conference Proceedings (OSTI)

Lawrence Livermore National Laboratory (LLNL) has converted a commercial 200kV transmission electron microscope (TEM) into an ultrafast, nanoscale diagnostic tool for material science studies. The resulting Dynamic Transmission Electron Microscope (DTEM) has provided a unique tool for the study of material phase transitions, reaction front analyses, and other studies in the fields of chemistry, materials science, and biology. The TEM's thermionic electron emission source was replaced with a fast photocathode and a laser beam path was provided for ultraviolet surface illumination. The resulting photoelectron beam gives downstream images of 2 and 20 ns exposure times at 100 and 10 nm spatial resolution. A separate laser, used as a pump pulse, is used to heat, ignite, or shock samples while the photocathode electron pulses, carefully time-synchronized with the pump, function as probe in fast transient studies. The device functions in both imaging and diffraction modes. A laser upgrade is underway to make arbitrary cathode pulse trains of variable pulse width of 10-1000 ns. Along with a fast e-beam deflection scheme, a 'movie mode' capability will be added to this unique diagnostic tool. This talk will review conventional electron microscopy and its limitations, discuss the development and capabilities of DTEM, in particularly addressing the prime and pulsed power considerations in the design and fabrication of the DTEM, and conclude with the presentation of a deflector and solid-state pulser design for Movie-Mode DTEM.

dehope, w j; browning, n; campbell, g; cook, e; king, w; lagrange, t; reed, b; stuart, b; Shuttlesworth, R; Pyke, B

2009-06-25T23:59:59.000Z

Note: This page contains sample records for the topic "microscope n2 purged" 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

NCEM National Center for Electron Microscopy: Microscopes and Facilities:  

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

Specimen Preparation Specimen Preparation Preparation of samples with large transparent areas and flat surfaces is a key element of electron microscopy. In particular, the interpretation of lattice or holographic images is often limited by the sample's geometry and surface roughness. These parameters are largely determined by a particular sample preparation procedure. The increasing demand for microscopes with a spatial resolution of better than 1Ă… increases the need for improved sample preparation techniques. A substantial effort at NCEM is devoted to the development of reliable and specialized thinning techniques. Current programs explore the application of chemicals to shape the surfaces of thin films, the use of nanospheres for observation of small particles, and the

182

Analytical scanning evanescent microwave microscope and control stage  

DOE Patents (OSTI)

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

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

2013-01-22T23:59:59.000Z

183

In situ laser processing in a scanning electron microscope  

Science Conference Proceedings (OSTI)

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

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

2012-01-01T23:59:59.000Z

184

Highly charged ion based time of flight emission microscope  

DOE Patents (OSTI)

A highly charged ion based time-of-flight emission microscope has been designed, which improves the surface sensitivity of static SIMS measurements because of the higher ionization probability of highly charged ions. Slow, highly charged ions are produced in an electron beam ion trap and are directed to the sample surface. The sputtered secondary ions and electrons pass through a specially designed objective lens to a microchannel plate detector. This new instrument permits high surface sensitivity (10.sup.10 atoms/cm.sup.2), high spatial resolution (100 nm), and chemical structural information due to the high molecular ion yields. The high secondary ion yield permits coincidence counting, which can be used to enhance determination of chemical and topological structure and to correlate specific molecular species.

Barnes, Alan V. (Livermore, CA); Schenkel, Thomas (San Francisco, CA); Hamza, Alex V. (Livermore, CA); Schneider, Dieter H. (Livermore, CA); Doyle, Barney (Albuquerque, NM)

2001-01-01T23:59:59.000Z

185

Transmission electron microscope sample holder with optical features  

DOE Patents (OSTI)

A sample holder for holding a sample to be observed for research purposes, particularly in a transmission electron microscope (TEM), generally includes an external alignment part for directing a light beam in a predetermined beam direction, a sample holder body in optical communication with the external alignment part and a sample support member disposed at a distal end of the sample holder body opposite the external alignment part for holding a sample to be analyzed. The sample holder body defines an internal conduit for the light beam and the sample support member includes a light beam positioner for directing the light beam between the sample holder body and the sample held by the sample support member.

Milas, Mirko (Port Jefferson, NY); Zhu, Yimei (Stony Brook, NY); Rameau, Jonathan David (Coram, NY)

2012-03-27T23:59:59.000Z

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 {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

187

Microscopic characterization of radionuclide contaminated soils to assist remediation efforts  

Science Conference Proceedings (OSTI)

A combination of optical, scanning, and analytical electron microscopies have been used to describe the nature of radionuclide contamination at several sites. These investigations were conducted to provide information for remediation efforts. This technique has been used successfully with uranium-contaminated soils from Fernald, OH, and Portsmouth, OH, thorium-contaminated soil from a plant in Tennessee, plutonium-contamination sand from Johnston Island in the Pacific Ocean, and incinerator ash from Los Alamos, NM. Selecting the most suitable method for cleaning a particular site is difficult if the nature of the contamination is not understood. Microscopic characterization allows the most appropriate method to be selected for removing the contamination and can show the effect a particular method is having on the soil. A method of sample preparation has been developed that allows direct comparison of scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images, enabling characterization of TEM samples to be more representative of the bulk sample.

Buck, E.C.; Brown, N.R.; Dietz, N.L.; Fortner, J.A.; Bates, J.K.

1994-11-01T23:59:59.000Z

188

Level densities of nickel isotopes: microscopic theory versus experiment  

E-Print Network (OSTI)

We apply a spin-projection method to calculate microscopically the level densities of a family of nickel isotopes $^{59-64}$Ni using the shell model Monte Carlo approach in the complete $pfg_{9/2}$ shell. Accurate ground-state energies of the odd-mass nickel isotopes, required for the determination of excitation energies, are determined using the Green's function method recently introduced to circumvent the odd particle-number sign problem. Our results are in excellent agreement with recent measurements based on proton evaporation spectra and with level counting data at low excitation energies. We also compare our results with neutron resonance data, assuming equilibration of parity and a spin-cutoff model for the spin distribution at the neutron binding energy, and find good agreement with the exception of $^{63}$Ni.

M. Bonett-Matiz; Abhishek Mukherjee; Y. Alhassid

2013-05-01T23:59:59.000Z

189

A millikelvin scanning tunneling microscope with two independent scanning systems  

E-Print Network (OSTI)

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

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

2013-01-01T23:59:59.000Z

190

Neutron scattering analysis with microscopic optical model potentials  

Science Conference Proceedings (OSTI)

A review of microscopic optical model potentials used in the analysis of neutron scattering and analyzing power data below 100 MeV (5 {le}E{sub n}{le}100 MeV) is presented. The quality of the fits to the data over a wide massd ({sup 6}Li-{sup 239}Pu) and energy range is discussed. It is shown that reasonably good agreement with the data is obtained with only three parameters, {lambda}{sub V}, {lambda}{sub W}, and {lambda}{sub SO}, which show a smooth mass and energy dependence. These parameters are normalizing constants to the real (V), and imaginary (W) central potentials and the real spin-orbit (V{sub SO}) potential. 14 refs., 7 figs.

Hansen, L.F.

1991-09-03T23:59:59.000Z

191

Analytical scanning evanescent microwave microscope and control stage  

DOE Patents (OSTI)

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

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

2009-06-23T23:59:59.000Z

192

Microscopic Study on the Interface Reaction between Ti and Al-Zn ...  

Science Conference Proceedings (OSTI)

Presentation Title, Microscopic Study on the Interface Reaction between Ti and Al -Zn Alloy during Ultra-Fast Heat Treatment. Author(s), Yue Zhao, David Nolan, ...

193

MICROSCOPIC CALCULATIONS OF FISSION BARRIERS AND CRITICAL ANGULAR MOMENTA FOR EXCITED HEAVY NUCLEAR SYSTEMS  

E-Print Network (OSTI)

Physics and Chemistry of Fission, Vienna 1969 (IAEA, ViennaDeformation energies along the fission path plotted againstMICROSCOPIC CALCULATIONS OF FISSION BARRIERS AND CRITICAL

Diebel, Michael

2013-01-01T23:59:59.000Z

194

Microscopic Characterization of Carbonaceous Aerosol Particle Aging in the Outflow from Mexico City  

E-Print Network (OSTI)

Northwest National Laboratory. PNNL is operated by the U.S.Northwest National Laboratory (PNNL). Detailed experimentalelectron microscope at EMSL/PNNL was used for computer

Moffet, R. C.

2010-01-01T23:59:59.000Z

195

Developing Greenhouse Gas Emissions Offsets by Reducing Nitrous Oxide (N2O) Emissions in Agricultural Crop Production: Experience Validating a New GHG Offset Protocol  

Science Conference Proceedings (OSTI)

This project report describes in part the second phase (years four through six, 2010–2012) of a two-phase, six-year long EPRI-sponsored research project entitled “Developing Greenhouse Gas Emissions Offsets by Reducing Nitrous Oxide (N2O) Emissions.” This project investigated an innovative approach to developing large-scale, cost-effective greenhouse gas (GHG) emissions offsets that potentially can be implemented across broad geographic areas of the ...

2013-05-28T23:59:59.000Z

196

Nitrogen Fertilizer Management for Nitrous Oxide (N2O) Mitigation in Intensive Corn (Maize) Production: An Emissions Reduction Proto col for US Midwest Agriculture  

Science Conference Proceedings (OSTI)

Status: Published Citation: Millar, N; Robertson, GP; Grace, PR; Gehl, RJ; and Hoben, JP. 2010. Nitrogen Fertilizer Management for Nitrous Oxide (N2O) Mitigation in Intensive Corn (Maize) Production: An Emissions Reduction Protocol for US Midwest Agriculture. In Journal of Mitigation and Adaptation Strategies for Global Change,Volume 15, Number 2, 2010, pp. 185-204. Link to Journal Publication: See Journal of Mitigation and Adaptation Strategies for Global Change.

2010-09-03T23:59:59.000Z

197

Nitrogen Fertilizer Management for Nitrous Oxide (N2O) Mitigation in Intensive Corn (Maize) Production: An Emissions Redu ction Protocol for U.S. Midwest Agriculture  

Science Conference Proceedings (OSTI)

Status: Published Citation: Millar, N; Robertson, GP; Grace, PR; Gehl, RJ; and Hoben; JP. 2010. Nitrogen Fertilizer Management for Nitrous Oxide (N2O) Mitigation in Intensive Corn (Maize) Production: An Emissions Reduction Protocol for U.S. Midwest Agriculture. In Mitigation and Adaptation Strategies for Global Change, Volume 15, Number 2, 2010, pp. 185-204. A peer-reviewed journal article that identifies, describes and analyzes socio-economic factors that may encourage or inhibit farmers from participat...

2009-12-17T23:59:59.000Z

198

Microscopic scattering theory for interacting bosons in weak random potentials  

E-Print Network (OSTI)

We develop a diagrammatic scattering theory for interacting bosons in a three-dimensional, weakly disordered potential. Based on a microscopic N-body scattering theory, we identify the relevant diagrams including elastic and inelastic collision processes that are sufficient to describe diffusive quantum transport. By taking advantage of the statistical properties of the weak disorder potential, we demonstrate how the N-body dynamics can be reduced to a nonlinear integral equation of Boltzmann type for the single-particle diffusive flux. Our theory reduces to the Gross-Pitaevskii mean field description in the limit where only elastic collisions are taken into account. However, even at weak interaction strength, inelastic collisions lead to energy redistribution between the bosons - initially prepared all at the same single-particle energy - and thereby induce thermalization of the single-particle current. In addition, we include also weak localization effects and determine the coherent corrections to the incoherent transport in terms of the coherent backscattering signal. We find that inelastic collisions lead to an enhancement of the backscattered cone in a narrow spectral window for increasing interaction strength.

Tobias Geiger; Andreas Buchleitner; Thomas Wellens

2013-07-18T23:59:59.000Z

199

Photocathode Optimization for a Dynamic Transmission Electron Microscope: Final Report  

SciTech Connect

The Dynamic Transmission Electron Microscope (DTEM) team at Harvey Mudd College has been sponsored by LLNL to design and build a test setup for optimizing the performance of the DTEM's electron source. Unlike a traditional TEM, the DTEM achieves much faster exposure times by using photoemission from a photocathode to produce electrons for imaging. The DTEM team's work is motivated by the need to improve the coherence and current density of the electron cloud produced by the electron gun in order to increase the image resolution and contrast achievable by DTEM. The photoemission test setup is nearly complete and the team will soon complete baseline tests of electron gun performance. The photoemission laser and high voltage power supply have been repaired; the optics path for relaying the laser to the photocathode has been finalized, assembled, and aligned; the internal setup of the vacuum chamber has been finalized and mostly implemented; and system control, synchronization, and data acquisition has been implemented in LabVIEW. Immediate future work includes determining a consistent alignment procedure to place the laser waist on the photocathode, and taking baseline performance measurements of the tantalum photocathode. Future research will examine the performance of the electron gun as a function of the photoemission laser profile, the photocathode material, and the geometry and voltages of the accelerating and focusing components in the electron gun. This report presents the team's progress and outlines the work that remains.

Ellis, P; Flom, Z; Heinselman, K; Nguyen, T; Tung, S; Haskell, R; Reed, B W; LaGrange, T

2011-08-04T23:59:59.000Z

200

Braking system for use with an arbor of a microscope  

DOE Patents (OSTI)

A balanced braking system comprising a plurality of braking assemblies located about a member to be braked. Each of the braking assemblies consists of a spring biased piston of a first material fitted into a body of a different material which has a greater contraction upon cooling than the piston material. The piston is provided with a recessed head portion over which is positioned a diaphragm and forming a space therebetween to which is connected a pressurized fluid supply. The diaphragm is controlled by the fluid in the space to contact or withdraw from the member to be braked. A cooling device causes the body within which the piston is fitted to contract more than the piston, producing a tight shrink fit therebetween. The braking system is particularly applicable for selectively braking an arbor of an electron microscope which immobilizes, for example, a vertically adjustable low temperature specimen holder during observation. The system provides balanced braking forces which can be easily removed and re-established with minimal disturbance to arbor location.

Norgren, Duane U. (Orinda, CA)

1984-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "microscope n2 purged" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

Towards a Microscopic Reaction Description Based on Energy Density Functionals  

SciTech Connect

A microscopic calculation of reaction cross sections for nucleon-nucleus scattering has been performed by explicitly coupling the elastic channel to all particle-hole excitations in the target and one-nucleon pickup channels. The particle-hole states may be regarded as doorway states through which the flux flows to more complicated configurations, and subsequently to long-lived compound nucleus resonances. Target excitations for {sup 40,48}Ca, {sup 58}Ni, {sup 90}Zr and {sup 144}Sm were described in a random-phase framework using a Skyrme functional. Reaction cross sections obtained agree very well with experimental data and predictions of a state-of-the-art fitted optical potential. Couplings between inelastic states were found to be negligible, while the pickup channels contribute significantly. The effect of resonances from higher-order channels was assessed. Elastic angular distributions were also calculated within the same method, achieving good agreement with experimental data. For the first time observed absorptions are completely accounted for by explicit channel coupling, for incident energies between 10 and 70 MeV, with consistent angular distribution results.

Nobre, G A; DIetrich, F S; Escher, J E; Thompson, I J; Dupuis, M; Terasaki, J; Engel, J

2011-09-26T23:59:59.000Z

202

Microscopic track structure of equal-LET heavy ions  

SciTech Connect

The spatial distributions of ionization and energy deposition produced by heavy (HZE) ions are crucial to an understanding of their radiation quality as exhibited eg., in track segment experiments of cell survival and chromosome aberrations of mammalian cells. The stopping power (or LET) of a high velocity ion is proportional to the ratio Z**2/v**2, apart from a slowly varying logarithmic factor. The maximum delta-ray energy that an ion can produce is proportional to v**2 (non-relativistically). Therefore, two HZE ions having the same LET, but in general differing Z and v will have different maximum delta-ray energies and consequently will produce different spatial patterns of energy deposition along their paths. To begin to explore the implications of this fact for the microscopic dosimetry of heavy ions, we have calculated radial distributions in energy imparted and ionization for iron and neon ions of approximately equal LET in order to make a direct comparison of their delta-ray track structure. Monte Carlo techniques are used for the charged particle radiation transport simulation. 10 refs., 8 figs.

Wilson, W.E.; Criswell, T.L.

1986-07-01T23:59:59.000Z

203

The Microscopic Approach to Nuclear Matter and Neutron Star Matter  

E-Print Network (OSTI)

We review a variety of theoretical and experimental investigations aimed at improving our knowledge of the nuclear matter equation of state. Of particular interest are nuclear matter extreme states in terms of density and/or isospin asymmetry. The equation of state of matter with unequal concentrations of protons and neutrons has numerous applications. These include heavy-ion collisions, the physics of rare, short-lived nuclei and, on a dramatically different scale, the physics of neutron stars. The "common denominator" among these (seemingly) very different systems is the symmetry energy, which plays a crucial role in both the formation of the neutron skin in neutron-rich nuclei and the radius of a neutron star (a system 18 orders of magnitude larger and 55 orders of magnitude heavier). The details of the density dependence of the symmetry energy are not yet sufficiently constrained. Throughout this article, our emphasis will be on the importance of adopting a microscopic approach to the many-body problem, which we believe to be the one with true predictive power.

Francesca Sammarruca

2010-01-31T23:59:59.000Z

204

Biological applications of an LCoS-BASED PROGRAMMABLE ARRAY MICROSCOPE (PAM)  

E-Print Network (OSTI)

fluorescence microscope (PAM) for rapid, light efficient 3D imaging of living specimens. The stand-alone module fluorescence microscope. The prototype system currently operated at the Max Planck Institute incorporates a 6-position high-intensity LED illuminator, modulated laser and lamp light sources, and an Andor iXon em

Rieger, Bernd

205

A Planned Neck Dissection Is Not Necessary in All Patients With N2-3 Head-and-Neck Cancer After Sequential Chemoradiotherapy  

SciTech Connect

Purpose: To assess the role of a planned neck dissection (PND) after sequential chemoradiotherapy for patients with head-and-neck cancer with N2-N3 nodal disease. Methods and Materials: We reviewed 90 patients with N2-N3 head-and-neck squamous cell carcinoma treated between 1991 and 2001 on two sequential chemoradiotherapy protocols. All patients received induction and concurrent chemotherapy with cisplatin and 5-fluorocuracil, with or without tirapazamine. Patients with less than a clinical complete response (cCR) in the neck proceeded to a PND after chemoradiation. The primary endpoint was nodal response. Clinical outcomes and patterns of failure were analyzed. Results: The median follow-up durations for living and all patients were 8.3 years (range, 1.5-16.3 year) and 5.4 years (range, 0.6-16.3 years), respectively. Of the 48 patients with nodal cCR whose necks were observed, 5 patients had neck failures as a component of their recurrence [neck and primary (n = 2); neck, primary, and distant (n = 1); neck only (n = 1); neck and distant (n = 1)]. Therefore, PND may have benefited only 2 patients (4%) [neck only failure (n = 1); neck and distant failure (n = 1)]. The pathologic complete response (pCR) rate for those with a clinical partial response (cPR) undergoing PND (n = 30) was 53%. The 5-year neck control rates after cCR, cPR{yields}pCR, and cPR{yields}pPR were 90%, 93%, and 78%, respectively (p = 0.36). The 5-year disease-free survival rates for the cCR, cPR{yields}pCR, and cPR{yields}pPR groups were 53%, 75%, and 42%, respectively (p = 0.04). Conclusion: In our series, patients with N2-N3 neck disease achieving a cCR in the neck, PND would have benefited only 4% and, therefore, is not recommended. Patients with a cPR should be treated with PND. Residual tumor in the PND specimens was associated with poor outcomes; therefore, aggressive therapy is recommended. Studies using novel imaging modalities are needed to better assess treatment response.

Soltys, Scott G., E-mail: sgsoltys@stanford.edu [Department of Radiation Oncology, Stanford University Medical Center, Stanford, CA (United States); Choi, Clara Y.H. [Department of Neurosugery, Stanford University Medical Center, Stanford, CA (United States); Fee, Willard E. [Department of Otolaryngology, Stanford University Medical Center, Stanford, CA (United States); Pinto, Harlan A. [Department of Medical Oncology, Stanford University Medical Center, Stanford, CA (United States); Veterans Affairs, Palo Alto Health Care System, Palo Alto, CA (United States); Le, Quynh-Thu [Department of Radiation Oncology, Stanford University Medical Center, Stanford, CA (United States)

2012-07-01T23:59:59.000Z

206

Geek-Up[6.3.2011]: Inked PV, Diagnostic Tools and Tough Microscopes |  

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

3.2011]: Inked PV, Diagnostic Tools and Tough Microscopes 3.2011]: Inked PV, Diagnostic Tools and Tough Microscopes Geek-Up[6.3.2011]: Inked PV, Diagnostic Tools and Tough Microscopes June 3, 2011 - 2:04pm Addthis Novartis Diagnostics scientist Cleo Salisbury and Biological Nanostructures Facility director Ron Zuckermann discuss their collaboration to discover new therapies for Alzheimer's. Niketa Kumar Niketa Kumar Public Affairs Specialist, Office of Public Affairs What does this mean for me? Researchers have developed new inorganic nanocrystal arrays created by spraying a new type of colloidal "ink." Scientists have engineered a technique to help doctors identify Alzheimer's in its early stages and discover new therapies for this disease. Scientists have developed a new type of atomic force microscope that

207

Particles from Comet 81P/Wild 2 Viewed by ALS Microscopes  

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

and Beamline 11.0.2, it was possible to combine this technique with the scanning transmission x-ray microscope (STXM) to image the spatial distribution of the compounds. Some...

208

Microscopic Analysis of Agriculture Products, 4th EditionChapter 3 Feed Ingredients of Animal Origin  

Science Conference Proceedings (OSTI)

Microscopic Analysis of Agriculture Products, 4th Edition Chapter 3 Feed Ingredients of Animal Origin Methods and Analyses eChapters Methods - Analyses Books Downloadable pdf of Chapter 3 Feed Ingredients of Animal Or

209

Telecontrol of Ultra-High Voltage Electron Microscope over Global IPv6 Network  

Science Conference Proceedings (OSTI)

Osaka University has an Ultra-High VoltageElectron Microscope (UHVEM) which can provide highquality specimen images for worldwide researchers. Forusability improvements, we have worked on thetelecontrol of the UHVEM. In this paper, we would liketo introduce ...

Toyokazu Akiyama; Shinji Shimojo; Shojiro Nishio; Yoshinori Kitatsuji; Steven Peltier; Thomas Hutton; Fang-Pang Lin

2003-01-01T23:59:59.000Z

210

Particles from Comet 81P/Wild 2 Viewed by ALS Microscopes  

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

5.3.2 and Beamline 11.0.2, it was possible to combine this technique with the scanning transmission x-ray microscope (STXM) to image the spatial distribution of the compounds....

211

A Study on Carbon-Nanotube Local Oxidation Lithography Using an Atomic Force Microscope  

Science Conference Proceedings (OSTI)

In this paper, nanoscale anodic oxidation lithography using an atomic force microscope (AFM) is systematically studied on carbon nanotubes (CNTs). Trends between the produced feature size and the corresponding process parameters, such as applied voltage, ...

K. Kumar; O. Sul; S. Strauf; D. S. Choi; F. Fisher; M. G. Prasad; E. Yang

2011-07-01T23:59:59.000Z

212

Progress on PEEM3 - An Aberration Corrected X-Ray Photoemission Electron Microscope at the ALS  

E-Print Network (OSTI)

Electron Microscope at the ALS A.A.MacDowell 1 , J.Feng 1 ,the Advanced Light Source (ALS). An electron mirror combinedat the Advanced Light Source (ALS). This limit is due to the

2006-01-01T23:59:59.000Z

213

Microscopic Analysis of Agriculture Products, 4th EditionChapter 2 Feed Ingredients of Plant Origin  

Science Conference Proceedings (OSTI)

Microscopic Analysis of Agriculture Products, 4th Edition Chapter 2 Feed Ingredients of Plant Origin Methods and Analyses eChapters Methods - Analyses Books Press Downloadable pdf of Chapter 2 Feed Ingredients of

214

Microscopic Analysis of Agriculture Products, 4th EditionChapter 4 Feed Ingredients of Marine Origin  

Science Conference Proceedings (OSTI)

Microscopic Analysis of Agriculture Products, 4th Edition Chapter 4 Feed Ingredients of Marine Origin Methods and Analyses eChapters Methods - Analyses Books Press Downloadable pdf of Chapter 4 Feed Ingredients of

215

Microscopic Analysis of Agriculture Products, 4th EditionChapter 7 Weed Seeds of Agricultural Importance  

Science Conference Proceedings (OSTI)

Microscopic Analysis of Agriculture Products, 4th Edition Chapter 7 Weed Seeds of Agricultural Importance Methods and Analyses eChapters Methods - Analyses Books Press Downloadable pdf of Chapter 7 Weed Seeds of A

216

Microscopic Analysis of Agriculture Products, 4th EditionChapter 8 Minerals of Agricultural Importance  

Science Conference Proceedings (OSTI)

Microscopic Analysis of Agriculture Products, 4th Edition Chapter 8 Minerals of Agricultural Importance Methods and Analyses eChapters Methods - Analyses Books Press Downloadable pdf of Chapter 8 Minerals of Agric

217

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

Science Conference Proceedings (OSTI)

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

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

2012-06-15T23:59:59.000Z

218

X-ray imaging with grazing-incidence microscopes developed for the LIL program  

SciTech Connect

This article describes x-ray imaging with grazing-incidence microscopes, developed for the experimental program carried out on the Ligne d'Integration Laser (LIL) facility [J. P. Le Breton et al., Inertial Fusion Sciences and Applications 2001 (Elsevier, Paris, 2002), pp. 856-862] (24 kJ, UV--0.35 nm). The design includes a large target-to-microscope (400-700 mm) distance required by the x-ray ablation issues anticipated on the Laser MegaJoule facility [P. A. Holstein et al., Laser Part. Beams 17, 403 (1999)] (1.8 MJ) which is under construction. Two eight-image Kirkpatrick-Baez microscopes [P. Kirkpatrick and A. V. Baez J. Opt. Soc. Am. 38, 766 (1948)] with different spectral wavelength ranges and with a 400 mm source-to-mirror distance image the target on a custom-built framing camera (time resolution of {approx}80 ps). The soft x-ray version microscope is sensitive below 1 keV and its spatial resolution is better than 30 {mu}m over a 2-mm-diam region. The hard x-ray version microscope has a 10 {mu}m resolution over an 800-{mu}m-diam region and is sensitive in the 1-5 keV energy range. Two other x-ray microscopes based on an association of toroidal/spherical surfaces (T/S microscopes) produce an image on a streak camera with a spatial resolution better than 30 {mu}m over a 3 mm field of view in the direction of the camera slit. Both microscopes have been designed to have, respectively, a maximum sensitivity in the 0.1-1 and 1-5 keV energy range. We present the original design of these four microscopes and their test on a dc x-ray tube in the laboratory. The diagnostics were successfully used on LIL first experiments early in 2005. Results of soft x-ray imaging of a radiative jet during conical shaped laser interaction are shown.

Rosch, R.; Boutin, J. Y.; Le Breton, J. P.; Gontier, D.; Jadaud, J. P.; Reverdin, C.; Soullie, G.; Lidove, G.; Maroni, R. [CEA/DIF, BP 12, 91680 Bruyeres-Le-Chatel (France)

2007-03-15T23:59:59.000Z

219

Experimental and Theoretical Evidence of Basic Site Preference in Polyfunctional Superbasic Amidinazine: N-1,N-1-Dimethyl-N-2-beta-(2-pyridylethyl)formamidine  

SciTech Connect

The gas-phase basicity (GB) of the flexible polyfunctional N1,N1-dimethyl-N2-a-(2-pyridylethyl)-formamidine (1) containing two potential basic sites (the ring N-aza and the chain N-imino) is obtained from proton-transfer equilibrium constant measurements, using Fourier-transform ioncyclotron resonance mass spectrometry. Comparison of the experimental GB obtained for 1 with those reported for model amidines and azines indicates that the chain N-imino in the amidine group is the favored site of protonation. Semiempirical (AM1) and ab initio calculations (HF, MP2, and DFT), performed for 1 and its protonated forms, confirm this interpretation. These results are in contrast to those found previously for N1,N1-dimethyl-N2-azinylformamidines (containing the amidine function directly linked to the azinyl ring), in which the ring N-aza is the most basic site in the gas phase. The separation of the two potential basic sites in 1 by the ethylene chain interrupts the resonance conjugation between the two functions and changes their relative basicities and, thus, the preferable site of protonation. It also increases the chelation effect against the proton and the gas-phase basicity of 1 in such a magnitude that consequently 1 may be classified as a superbase (GB 241.1 kcal mol-1). A transition state corresponding to the internal transfer of the proton (ITP) between the ring N-aza and the chain N-imino in 1 is investigated at the DFT(B3LYP)/6-31G** level. The energy barrier calculated for the ITP between the two basic sites is small and vanishes when zero-point vibrational terms and thermal corrections are applied to obtain the enthalpy or Gibbs energy of activation for the proton transfer. Additional calculations at the DFT-(MPW1K)/6-31G** level confirm this behavior. This indicates that the quantum-chemical ITP in 1 has a single-well character. The proton is located on the N-imino site, and the H-bond is formed

Raczynska, Ewa D.; Darowska, Malgorzata; Dabkowska, Iwona; Decouzon, Michele; Gal, Jean-Francois; Maria, Pierre-Charles; Poliart, Christine D.

2004-06-11T23:59:59.000Z

220

Microscopic Calculation of Fission Fragment Energies for the 239Pu(nth,f) Reaction  

SciTech Connect

We calculate the total kinetic and excitation energies of fragments produced in the thermal-induced fission of {sup 239}Pu. This result is a proof-of-principle demonstration for a microscopic approach to the calculation of fission-fragment observables for applied data needs. In addition, the calculations highlight the application of a fully quantum mechanical description of scission, and the importance of exploring scission configurations as a function of the moments of the fragments, rather than through global constraints on the moments of the fissioning nucleus. Using a static microscopic calculation of configurations at and near scission, we have identified fission fragments for the {sup 239}Pu (n{sub th}, f) reaction and extracted their total kinetic and excitation energies. Comparison with data shows very good overall agreement between theory and experiment. Beyond their success as a proof of principle, these calculations also highlight the importance of local constraints on the fragments themselves in microscopic calculations.

Younes, W; Gogny, D

2011-10-03T23:59:59.000Z

Note: This page contains sample records for the topic "microscope n2 purged" 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

Ellipsoidal and parabolic glass capillaries as condensers for x-ray microscopes  

Science Conference Proceedings (OSTI)

Single-bounce ellipsoidal and paraboloidal glass capillary focusing optics have been fabricated for use as condenser lenses for both synchrotron and tabletop x-ray microscopes in the x-ray energy range of 2.5-18 keV. The condenser numerical apertures (NAs) of these devices are designed to match the NA of x-ray zone plate objectives, which gives them a great advantage over zone plate condensers in laboratory microscopes. The fabricated condensers have slope errors as low as 20 {mu}rad rms. These capillaries provide a uniform hollow-cone illumination with almost full focusing efficiency, which is much higher than what is available with zone plate condensers. Sub-50 nm resolution at 8 keV x-ray energy was achieved by utilizing this high-efficiency condenser in a laboratory microscope based on a rotating anode generator.

Zeng Xianghui; Duewer, Fred; Feser, Michael; Huang, Carson; Lyon, Alan; Tkachuk, Andrei; Yun Wenbing

2008-05-01T23:59:59.000Z

222

Blue-green laser output from N(+2) and XeF. Final technical report, 1 Jan 77-31 Oct 81  

Science Conference Proceedings (OSTI)

The objective of this work was to determine the feasibility of developing, first the helium nitrogen charge transfer laser, and later the XeF laser into efficient scalable devices excited by preionized discharges for the production of blue-green outputs. The performance and scalability of the N2(+) laser pumped by charge transfer from He2(+) was determined in such a discharge environment. The gain and saturation parameters were measured and a regenerative amplifier capable of operation at 470.9 nm was constructed. A traveling wave device was built which at 427 nm produced peak powers of 5 MW in the forward direction and which had a front-to-back ratio of 10,000 to 1 for the pulse energies. Efforts were made to apply that technology to the problem of switching the output from a XeF laser into the C yields A transition at 480 nm. Gain and saturation parameters were examined and it was found that the relative gains between the stronger UV transition and the blue-green transition were greater than 30 to 1. These results implied that the blue-green transition of XeF was too weak to support the development of any practical device pumped by a preionized discharge.

Collins, C.B.

1981-12-30T23:59:59.000Z

223

Auxiliary Ligand-Dependent Assembly of Several Ni/Ni-Cd Compounds with N2O2 Donor Tetradentate Symmetrical Schiff Base Ligand  

DOE Green Energy (OSTI)

Several low-dimensional Ni/Ni-Cd complexes containing N2O2 donor tetradentate symmetrical Schiff base ligand bis(acetylacetone)ethylene-diamine (sy-H2L2), namely, [Ni(sy-L2)]2?HLa?ClO4 (2), (HLa)2?(ClO4)?(NO3) (3), [Ni(sy-L2)X]2](4,4’-bipy) (where La = 5,7-dimethyl-3,6-dihydro-2H-1,4-diazepine, X = ClO4 (4), X=NO3 (5), [Ni(sy-L2)Cd(SCN)2]n (6) and [Ni(sy-L2)?Cd(N3)2]n (7) have been synthesized from [Ni(sy-L2)]2?H2O (1). Complex 2, is three component discrete assembly generated from (HLa)+ moiety bridged with [Ni(sy-L2)] unit and ClO4- anion. A solution containing complex 2 and Cd(NO3)2 results in a mixture of 1 and 3. Further re-crystallization of 1 and 3 with various auxiliary ligands, provides coordination complexes 4 – 7 stabilized by weak hydrogen bonds in which 6 and 7 represent the first 1D heteronuclear complexes based on symmetric acacen-base Schiff base ligand.

Ge, Ying Ying; Li, Guo-Bi; Fang, Hua-Cai; Zhan, Xu Lin; Gu, Zhi-Gang; Chen, Jin Hao; Sun, Feng; Cai, Yue-Peng; Thallapally, Praveen K.

2010-09-18T23:59:59.000Z

224

(Butan-2-ol-jO)[2-({(ethylsulfanyl)- [2-(2-oxidobenzylidene-jO)hydrazinylidene-jN 2]methyl}iminomethyl)phenolato-jO]dioxidouranium(VI)  

E-Print Network (OSTI)

disorder in main residue; R factor = 0.038; wR factor = 0.078; data-to-parameter ratio = 17.4. The U atom in the title complex, [U(C17H15N3O2S)O2-(C4H10O)], exists within a distorted pentagonal–bipyramidal geometry where the oxide O atoms occupy axial positions [O—U—O = 179.61 (18) ] and the pentagonal plane is defined by the N2O2 atoms of the tetradentate Schiff base ligand and the O atom of the butan-2-ol molecule. In the crystal, centrosymmetric aggregates are formed via pairs of hydroxy–phenoxide O—H O hydrogen bonds. The azomethine C N atoms, the ethylthiolyl group and the butyl group of the butan-2-ol molecule are disordered over two positions in a 0.668 (3):0.332 (3) ratio. Related literature For background to uranyl Schiff base complexes, see: S ¸ ahin et al. (2010); Özdemir et al. (2011). For a related structure, see: Takjoo et al. (2012).

Reza Takjoo; A Atefeh Najafi; A Seik Weng Ng B; Edward R. T. Tiekink B

2012-01-01T23:59:59.000Z

225

Quantitative Nanostructure Characterization Using Atomic Pair Distribution Functions Obtained From Laboratory Electron Microscopes  

Science Conference Proceedings (OSTI)

Quantitatively reliable atomic pair distribution functions (PDFs) have been obtained from nanomaterials in a straightforward way from a standard laboratory transmission electron microscope (TEM). The approach looks very promising for making electron derived PDFs (ePDFs) a routine step in the characterization of nanomaterials because of the ubiquity of such TEMs in chemistry and materials laboratories. No special attachments such as energy filters were required on the microscope. The methodology for obtaining the ePDFs is described as well as some opportunities and limitations of the method.

Abeykoon M.; Billinge S.; Malliakas, C.D.; Juhas, P.; Bozin, E.S.; Kanatzidis, M.G.

2012-05-01T23:59:59.000Z

226

Whole-Cell Sensing for a Harmful Bloom-Forming Microscopic Alga by Measuring Antibody-Antigen Forces  

E-Print Network (OSTI)

Fawley, “Diversity of coccoid algae in shallow lakes duringof small coccoid green algae from Lake Itasca, Minnesota,BLOOM-FORMING MICROSCOPIC ALGA BY MEASURING ANTIBODY–

2006-01-01T23:59:59.000Z

227

OIL IN THE OPEN WATER microscopic plants and animals that form the  

E-Print Network (OSTI)

OIL IN THE OPEN WATER microscopic plants and animals that form the basis of the oceanic food web the surface, corals and other deepwater OIL AND HUMAN USE Wellhead CORALS · Coral surveys · Tissue collections · Transect surveys to detect submerged oil · Oil plume modeling · Sediment sampling AQUATIC VEGETATION

228

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

Science Conference Proceedings (OSTI)

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

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

1981-01-01T23:59:59.000Z

229

The Researches of Microscopic Image Segmentation and Recognition on the Cancer Cells Fallen into Peritoneal Effusion  

Science Conference Proceedings (OSTI)

Abstract: Auto-segmentation of cell is one of the most interesting segmentation problems due to the complex nature of the cell tissues and to the inherent problems of video microscopic image. Objects, which are variant, narrow range of gray levels, non-random ... Keywords: Artificial neural network, computer-aided diagnosis, cell image segmentation, cell image recognition, peritoneal effusion

Hongyuan Wang; Shenggen Zeng; Chengang Yu; Xiaogang Wang; Deshen Xia

2001-06-01T23:59:59.000Z

230

Characterization of electron microscopes with binary pseudo-random multilayer test samples  

SciTech Connect

Verification of the reliability of metrology data from high quality x-ray optics requires that adequate methods for test and calibration of the instruments be developed. For such verification for optical surface profilometers in the spatial frequency domain, a modulation transfer function (MTF) calibration method based on binary pseudo-random (BPR) gratings and arrays has been suggested [Proc. SPIE 7077-7 (2007), Opt. Eng. 47(7), 073602-1-5 (2008)} and proven to be an effective calibration method for a number of interferometric microscopes, a phase shifting Fizeau interferometer, and a scatterometer [Nucl. Instr. and Meth. A 616, 172-82 (2010)]. Here we describe the details of development of binary pseudo-random multilayer (BPRML) test samples suitable for characterization of scanning (SEM) and transmission (TEM) electron microscopes. We discuss the results of TEM measurements with the BPRML test samples fabricated from a WiSi2/Si multilayer coating with pseudo randomly distributed layers. In particular, we demonstrate that significant information about the metrological reliability of the TEM measurements can be extracted even when the fundamental frequency of the BPRML sample is smaller than the Nyquist frequency of the measurements. The measurements demonstrate a number of problems related to the interpretation of the SEM and TEM data. Note that similar BPRML test samples can be used to characterize x-ray microscopes. Corresponding work with x-ray microscopes is in progress.

Yashchuk, Valeriy V; Conley, Raymond; Anderson, Erik H; Barber, Samuel K; Bouet, Nathalie; McKinney, Wayne R; Takacs, Peter Z; Voronov, Dmitriy L

2010-09-17T23:59:59.000Z

231

Wolter-like high resolution x-ray imaging microscope for Rayleigh Taylor instabilities studies  

SciTech Connect

In the context of the inertial confinement fusion, experiments have been carried out on the Phebus laser facility to study the Rayleigh-Taylor instabilities (RTIs) at the ablation front. Premodulated brominated plastic targets (25 {mu}m thick) with a modulation wavelength between 12 and 50 {mu}m were accelerated with a temporally shaped soft x-ray pulse emitted from a hohlraum with a maximum radiation temperature of about 115 eV. The RTI growth was measured by face-on radiography using a microscope coupled with an x-ray streak camera, which has spatial and temporal resolutions of about 5 {mu}m and 50 ps, respectively. The acceleration was derived from side-on velocity measurements. The microscope we have developed is a Wolter-like microscope which consists of two toroiedal mirrors. We will present the experimental and theoretical potentialities of this microscope: characterization with an x-ray generator and plasma laser x-ray source (Phebus facility) for two-dimensional (2D) and 1D time-resolved imaging studies. Spatial resolution of about 4 {mu}m was achieved in the 1-5 keV range. The Wolter-like constitutes an interesting device for laser plasma diagnostics and will be very useful in the Laser Megajoules experiments conducted with more powerful lasers.

Troussel, Ph.; Meyer, B.; Reverdin, R.; Angelier, B.; Lidove, G.; Salvatore, P.; Richard, A. [Commissariat a l'Energie Atomique, DAM-Ile de France, BP 12, 91680 Bruyeres-les-Chatel (France); Commissariat a l'Energie Atomique, Saclay 91191 (France); Commissariat a l'Energie Atomique, CESTA, BP2, 33114 Le Barp (France)

2005-06-15T23:59:59.000Z

232

Performance Evaluation of Adaptive Ramp-Metering Algorithms Using Microscopic Traffic Simulation Model  

E-Print Network (OSTI)

Performance Evaluation of Adaptive Ramp-Metering Algorithms Using Microscopic Traffic Simulation metering has undergone significant theoretical developments in recent years. However, the applicability been used in an evaluation study of three well-known adaptive ramp-metering algorithms: ALINEA, BOTTLE

Levinson, David M.

233

Microscopic Analysis of Agriculture Products, 4th EditionChapter 1 Methods of Agricultural Microscopy  

Science Conference Proceedings (OSTI)

Microscopic Analysis of Agriculture Products, 4th Edition Chapter 1 Methods of Agricultural Microscopy Methods and Analyses eChapters Methods - Analyses Books 97C1C49A76ADD9BFEBDE5FF95381F911 Press Downloadable pdf...

234

Microscopic Analysis of Agriculture Products, 4th EditionChapter 9 Microchemical Spot Tests  

Science Conference Proceedings (OSTI)

Microscopic Analysis of Agriculture Products, 4th Edition Chapter 9 Microchemical Spot Tests Methods and Analyses eChapters Methods - Analyses Books AOCS 6C2FB81BF33EA47CEF1B98AD0BE2A9CB Press Downloadable pdf...

235

Microscopic Analysis of Agriculture Products, 4th EditionChapter 6 Fertilizer Microscopy  

Science Conference Proceedings (OSTI)

Microscopic Analysis of Agriculture Products, 4th Edition Chapter 6 Fertilizer Microscopy Methods and Analyses eChapters Methods - Analyses Books AOCS 8C45832E2AA310DD11A6FEA4BDB93C6B Press Downloadable pdf...

236

Polarizing Microscopes  

Science Conference Proceedings (OSTI)

... NIKON SINGAPORE PTE LTD SINGAPORE Phone: +65-5593618 Fax: +65-5593668 NIKON MALAYSIA SDN. BHD. MALAYSIA ...

2011-05-17T23:59:59.000Z

237

Highly Reproducible Nanolithography by Dynamic Plough of an Atomic-Force Microscope Tip and Thermal-Annealing Treatment  

Science Conference Proceedings (OSTI)

An approach has been developed to use atomic-force microscope (AFM) to pattern materials at the nanoscale in a controlled manner. By introducing a thermal-annealing process above the glass-transition temperature of poly (methylmethacrylate) (PMMA), the ... Keywords: 2-D electron gas, Atomic-force microscope (AFM), nanolithography, self-switching diodes (SSDs)

Xiaofeng Lu; C. Balocco; Fuhua Yang; A. M. Song

2011-01-01T23:59:59.000Z

238

The concrete theory of numbers : New Mersenne conjectures. Simplicity and other wonderful properties of numbers $L(n) = 2^{2n}\\pm2^n\\pm1$  

E-Print Network (OSTI)

New Mersenne conjectures. The problems of simplicity, common prime divisors and free from squares of numbers $L(n) = 2^{2n}\\pm2^n\\pm1$ are investigated. Wonderful formulas $gcd $ for numbers $L (n) $ and numbers repunit are proved.

Boris V. Tarasov

2008-04-24T23:59:59.000Z

239

Seminar Announcement Nanoscale High Field Chemistry with the Atomic Force Microscope and Patterning January 15, 2009  

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

SEMINAR SEMINAR ANNOUNCMENT Thursday, January 15, 2009 11:00am - 12:00 noon EMSL Boardroom Nanoscale High Field Chemistry With the Atomic Force Microscope and Patterning Marco Rolandi Assistant Professor Department of Materials Science and Engineering, University of Washington, Seattle, WA 98195 Facile and affordable processes for the fabrication of nanostructures are fundamental to future endeavors in nanoscale science and engineering. The atomic force microscope was designed primarily for imaging, and has evolved into a versatile tool for nanoscale surface modification. We have developed an AFM based scheme capable of direct writing of glassy carbon nanowires as fast as 1 cm/s. In brief, when a bias is applied across the tip-sample gap a molecular precursor undergoes high field reactions that result in the deposition of a cross- linked product on the surface. In order to gain a

240

The R-curve response of ceramics with microscopic reinforcements: Reinforcement and additive effects  

SciTech Connect

Using direct observations with the scanning electron and optical microscopes, simultaneous measurements of fracture resistance versus crack length (R-curve behavior) and crack interactions with microstructural features at the crack tip and in its wake were made. Selecting whisker-reinforced aluminas and self-reinforced silicon nitrides, one can examine the effects of systematic modifications of microstructure and composition on the R-curve response and the mechanisms giving rise to it. Specifically, increases in whisker content and size can increase the R-Curve response, even for short crack lengths. In the self-reinforced silicon nitrides, changes in alumina: yttria additive ratios also modify the R-curve. Modeling of the R-curve response allows one to verify toughening mechanisms and, with experimental studies, to optimize the R-curve behavior in ceramics containing microscopic reinforcements, e.g., whiskers and elongated grain structures.

Becher, P.F.; Sun, E.Y.; Plucknett, K,P.; Hsueh, C.H.

1996-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "microscope n2 purged" 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

Design of a neutron penumbral-aperture microscope with 10-. mu. m resolution  

SciTech Connect

We are currently designing a 10-{mu}m resolution neutron penumbral-aperture microscope to diagnose high-convergence targets at the Nova laser facility. To achieve such high resolution, the new microscope will require substantial improvements in three areas. First, we have designed thick penumbral apertures with extremely sharp cutoffs over a useful ({approx}100 {mu}m) field of view; fabrication of such apertures appears feasible using gold electroplating techniques. Second, the limited field of view and required close proximity of the aperture to the target (2 cm) necessitates a durable mounting and alignment system with {plus}25 {mu}m accuracy. Finally, a neutron detector containing 160,000 scintillator elements is required; readout and optimization of this large array are outstanding issues. 5 refs., 3 figs.

Ress, D.; Lerche, R.A.; Ellis, R.J.; Lane, S.M.

1990-05-01T23:59:59.000Z

242

Spectro-microscopic Measurements of Carbonaceous Aerosol Aging in Central California  

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

Spectro-microscopic Measurements of Carbonaceous Spectro-microscopic Measurements of Carbonaceous Aerosol Aging in Central California For original submission and image(s), see ARM Research Highlights http://www.arm.gov/science/highlights/ Research Highlight Atmospheric aerosols affect climate by scattering and absorbing sunlight and by modifying the properties of clouds. However, there are gaps in our understanding of chemical processes involving these airborne particulates, and these gaps contribute significantly to uncertainties in predicting future climate change. Developing more- accurate global climate models requires a more complete understanding of the aerosol lifecycle, from initial particle formation to loss through incorporation into precipitating clouds or dry deposition. In research published in the journal Atmospheric Chemistry and Physics, a team of

243

Microscopic description of large-amplitude shape-mixing dynamics with local QRPA inertial functions  

E-Print Network (OSTI)

We introduce a microscopic approach to derive all the inertial functions in the five-dimensional quadrupole collective Hamiltonian. Local normal modes are evaluated on the constrained mean field in the quasiparticle random-phase approximation in order to derive the inertial functions. The collective Hamiltonians for neutron-rich Mg isotopes are determined with use of this approach, and the shape coexistence/mixing around the N = 20 region is analyzed.

Hinohara, Nobuo; Yoshida, Kenichi; Nakatsukasa, Takashi; Matsuo, Masayuki

2011-01-01T23:59:59.000Z

244

Microscopic description of large-amplitude shape-mixing dynamics with local QRPA inertial functions  

Science Conference Proceedings (OSTI)

We introduce a microscopic approach to derive all the inertial functions in the five-dimensional quadrupole collective Hamiltonian. Local normal modes are evaluated on the constrained mean field in the quasiparticle random-phase approximation in order to derive the inertial functions. The collective Hamiltonians for neutron-rich Mg isotopes are determined with use of this approach, and the shape coexistence/mixing around the N = 20 region is analyzed.

Hinohara, Nobuo; Yoshida, Kenichi; Nakatsukasa, Takashi [Theoretical Nuclear Physics Laboratory, RIKEN Nishina Center, Wako 351-0198 (Japan); Sato, Koichi [Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502 (Japan); Theoretical Nuclear Physics Laboratory, RIKEN Nishina Center, Wako 351-0198 (Japan); Matsuo, Masayuki [Department of Physics, Faculty of Science, Niigata University, Niigata 950-2181 (Japan)

2011-05-06T23:59:59.000Z

245

Microscopic surface structure of C/SiC composite mirrors for space cryogenic telescopes  

E-Print Network (OSTI)

We report on the microscopic surface structure of carbon-fiber-reinforced silicon carbide (C/SiC) composite mirrors that have been improved for the Space Infrared Telescope for Cosmology and Astrophysics (SPICA) and other cooled telescopes. The C/SiC composite consists of carbon fiber, silicon carbide, and residual silicon. Specific microscopic structures are found on the surface of the bare C/SiC mirrors after polishing. These structures are considered to be caused by the different hardness of those materials. The roughness obtained for the bare mirrors is 20 nm rms for flat surfaces and 100 nm rms for curved surfaces. It was confirmed that a SiSiC slurry coating is effective in reducing the roughness to 2 nm rms. The scattering properties of the mirrors were measured at room temperature and also at 95 K. No significant change was found in the scattering properties through cooling, which suggests that the microscopic surface structure is stable with changes in temperature down to cryogenic values. The C/SiC mirror with the SiSiC slurry coating is a promising candidate for the SPICA telescope.

Keigo Enya; Takao Nakagawa; Hidehiro Kaneda; Takashi Onaka; Tuyoshi Ozaki; Masami Kume

2007-07-10T23:59:59.000Z

246

Microscopic surface structure of C/SiC composite mirrors for space cryogenic telescopes  

E-Print Network (OSTI)

We report on the microscopic surface structure of carbon-fiber-reinforced silicon carbide (C/SiC) composite mirrors that have been improved for the Space Infrared Telescope for Cosmology and Astrophysics (SPICA) and other cooled telescopes. The C/SiC composite consists of carbon fiber, silicon carbide, and residual silicon. Specific microscopic structures are found on the surface of the bare C/SiC mirrors after polishing. These structures are considered to be caused by the different hardness of those materials. The roughness obtained for the bare mirrors is 20 nm rms for flat surfaces and 100 nm rms for curved surfaces. It was confirmed that a SiSiC slurry coating is effective in reducing the roughness to 2 nm rms. The scattering properties of the mirrors were measured at room temperature and also at 95 K. No significant change was found in the scattering properties through cooling, which suggests that the microscopic surface structure is stable with changes in temperature down to cryogenic values. The C/SiC ...

Enya, Keigo; Kaneda, Hidehiro; Onaka, Takashi; Ozaki, Tuyoshi; Kume, Masami

2007-01-01T23:59:59.000Z

247

A versatile three-contact electrical biasing transmission electron microscope specimen holder for electron holography and electron tomography of working devices  

E-Print Network (OSTI)

A versatile three-contact electrical biasing transmission electron microscope specimen holder to characterize nanoscale materials and devices under operating conditions in the transmission electron microscope in the transmission electron microscope (TEM) at a spatial resolution that can approach the nanometer scale

Dunin-Borkowski, Rafal E.

248

Research and Design of a Sample Heater for Beam Line 6-2c Transmission X-ray Microscope  

Science Conference Proceedings (OSTI)

There exists a need for environmental control of samples to be imaged by the Transmission X-Ray Microscope (TXM) at the SSRLs Beam Line 6-2c. In order to observe heat-driven chemical or morphological changes that normally occur in situ, microscopes require an additional component that effectively heats a given sample without heating any of the microscope elements. The confinement of the heat and other concerns about the heaters integrity limit which type of heater is appropriate for the TXM. The bulk of this research project entails researching different heating methods used previously in microscopes, but also in other industrial applications, with the goal of determining the best-fitting method, and finally in designing a preliminary sample heater.

Policht, Veronica; /Loyola U., Chicago /SLAC

2012-08-27T23:59:59.000Z

249

A Remote Operation System for the 3MV Electron Microscope with a Both-Direction Conversation Capability  

Science Conference Proceedings (OSTI)

The 3MV ultrahigh voltage electron microscope (UHVEM) at the Research Center for UHVEM, Osaka University, has been widely used for microscopy of thick specimens, taking advantage of high penetration power of incident electrons. Recent developments in ...

Hirotaro Mori; Kiyokazu Yoshida; Shinji Shimojo; Hiroki Nogawa; Toyokazu Akiyama; Heishichiro Takahashi; Tamaki Shibayama

2004-01-01T23:59:59.000Z

250

High Resolution Quantitative Auto-Radiography to determine microscopic distributions of B-10 in neutron capture therapy  

E-Print Network (OSTI)

The success of Boron Neutron Capture Therapy (BNCT) is heavily dependent on the microscopic distribution of B-10 in tissue. High Resolution Quantitative Auto-Radiography (HRQAR) is a potentially valuable analytical tool ...

Harris, Thomas C. (Thomas Cameron)

2006-01-01T23:59:59.000Z

251

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

E-Print Network (OSTI)

X-ray Microscope at the ALS for operation up to 2500eV DavidLight Source [2]. In the new ALS facility the energy rangein the two existing STXMs at ALS and a flexible platform for

Kilcoyne, David

2010-01-01T23:59:59.000Z

252

Microscopic Analysis of Agriculture Products, 4th EditionChapter 5 Detecting Animal Products in Feeds and Feed Ingredients  

Science Conference Proceedings (OSTI)

Microscopic Analysis of Agriculture Products, 4th Edition Chapter 5 Detecting Animal Products in Feeds and Feed Ingredients Methods and Analyses eChapters Methods - Analyses Books Press Downloadable pdf of Chapter

253

Spectro-Microscopic Measurements of Carbonaceous Aerosol Aging in Central California  

Science Conference Proceedings (OSTI)

Carbonaceous aerosols are responsible for large uncertainties in climate models, degraded visibility, and adverse health effects. The Carbonaceous Aerosols and Radiative Effects Study (CARES) was designed to study carbonaceous aerosols in the natural environment of Central Valley, California, and learn more about their atmospheric formation and aging. This paper presents results from spectro-microscopic measurements of carbonaceous particles collected during CARES at the time of pollution accumulation event (June 27-29, 2010), when in situ measurements indicated an increase in the organic carbon content of aerosols as the Sacramento urban plume aged. Computer controlled scanning electron microscopy coupled with an energy dispersive X-ray detector (CCSEM/EDX) and scanning transmission X-ray microscopy coupled with near edge X-ray absorption spectroscopy (STXM/NEXAFS) were used to probe the chemical composition and morphology of individual particles. It was found that the mass of organic carbon on individual particles increased through condensation of secondary organic aerosol. STXM/NEXAFS indicated that the number fraction of homogenous organic particles lacking inorganic inclusions (greater than ~50 nm diameter) increased with plume age as did the organic mass per particle. Comparison of the CARES spectro-microscopic data set with a similar dataset obtained in Mexico City during the MILAGRO campaign showed that individual particles in Mexico City contained twice as much carbon as those sampled during CARES. The number fraction of soot particles at the Mexico City urban site (30%) was larger than at the CARES urban site (10%) and the most aged samples from CARES contained less carbon-carbon double bonds. Differences between carbonaceous particles in Mexico City and California result from different sources, photochemical conditions, gas phase reactants, and secondary organic aerosol precursors. The detailed results provided by these spectro-microscopic measurements will allow for a comprehensive evaluation of aerosol process models used in climate research.

Moffet, Ryan C.; Rodel, Tobias; Kelly, Stephen T.; Yu, Xiao-Ying; Carroll, Gregory; Fast, Jerome D.; Zaveri, Rahul A.; Laskin, Alexander; Gilles, Mary K.

2013-10-29T23:59:59.000Z

254

Microscopic description of the odd-even effect in cold fission  

E-Print Network (OSTI)

The time dependent equations of motion for the pair breaking effect were corroborated with a condition that fixes dynamically the number of particles on the two fission fragment. The single particle level scheme was calculated with the Woods-Saxon superasymmetric two center shell model. This model provides a continuous variation of the energies from one nucleus up to two separated fragments. The dissipated energy resorts from the time dependent pairing equations. A peculiar phenomenon was observed experimentally in cold fission: the odd partition yields are favored over the even ones. This odd-even effect for cold fission was explained microscopically.

M. Mirea

2013-09-27T23:59:59.000Z

255

Evidence of microscopic effects in fragment mass distribution in heavy ion induced fusion-fission reactions  

E-Print Network (OSTI)

Our measurements of variances ($\\sigma_{m}^2$) in mass distributions of fission fragments from fusion-fission reactions of light projectiles (C, O and F) on deformed thorium targets exhibit a sharp anomalous increase with energy near the Coulomb barrier, in contrast to the smooth variation of $\\sigma_{m}^2$ for the spherical bismuth target. This departure from expectation based on a statistical description is explained in terms of microscopic effects arising from the orientational dependence in the case of deformed thorium targets.

T. K. Ghosh; S. Pal; K. S. Gold; P. Bhattacharya

2005-06-27T23:59:59.000Z

256

Analysis with electron microscope of multielement samples using pure element standards  

DOE Patents (OSTI)

A method and modified analytical electron microscope for determining the concentration of elements in a multielement sample by exposing samples with differing thicknesses for each element to a beam of electrons, simultaneously measuring the electron dosage and x-ray intensities for each sample of element to determine a "K.sub.AB " value to be used in the equation ##EQU1## where I is intensity and C is concentration for elements A and B, and exposing the multielement sample to determine the concentrations of the elements in the sample.

King, Wayne E. (Western Springs, IL)

1987-01-01T23:59:59.000Z

257

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

Science Conference Proceedings (OSTI)

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

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

2011-06-01T23:59:59.000Z

258

Magnetic lens apparatus for a low-voltage high-resolution electron microscope  

DOE Patents (OSTI)

A lens apparatus in which a beam of charged particles of low accelerating voltage is brought to a focus by a magnetic field, the lens being situated behind the target position. The lens comprises an electrically-conducting coil arranged around the axis of the beam and a magnetic pole piece extending along the axis of the beam at least within the space surrounded by the coil. The lens apparatus comprises the sole focusing lens for high-resolution imaging in a low-voltage scanning electron microscope.

Crewe, Albert V. (Palos Park, IL)

1996-01-01T23:59:59.000Z

259

MICROSCOPIC METABOLISM OF CALCIUM IN BONE. III. MICRORADIOGRAPHIC MEASUREMENTS OF MINERAL DENSITY  

SciTech Connect

The range of microscopic calcium densities in man and in dog does not change wiih the age of the individual. The ranges, however. are not the same in the two species. New bone mineral in the dog is formed at higher density than similar mineral in man, and highly mineralized bone in the dog is more dense than the most dense bone in man. Thus species differcnces in calcium metabolism of bone do exist and should not be overlooked in the intercomparison of the uptake and retention of the alkaline earths in mammalian skeletons. (auth)

Rowland, R.E.; Jowsey, J.; Marshall, J.H.

1959-02-01T23:59:59.000Z

260

Quantum-Mechanical Model of Spacetime I: Microscopic Properties of Spacetime  

E-Print Network (OSTI)

This is the first part in a series of two papers, where we consider a specific microscopic model of spacetime. In our model Planck size quantum black holes are taken to be the fundamental building blocks of space and time. Spacetime is assumed to be a graph, where black holes lie on the vertices. In this first paper we construct our model in details, and show how classical spacetime emerges at the long distance limit from our model. We also consider the statistics of spacetime.

Makela, J

2008-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "microscope n2 purged" 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

A Simple Quantum-Mechanical Model of Spacetime I: Microscopic Properties of Spacetime  

E-Print Network (OSTI)

This is the first part in a series of two papers, where we consider a specific microscopic model of spacetime. In our model Planck size quantum black holes are taken to be the fundamental building blocks of space and time. Spacetime is assumed to be a graph, where black holes lie on the vertices. In this first paper we construct our model in details, and show how classical spacetime emerges at the long distance limit from our model. We also consider the statistics of spacetime.

J. Makela

2008-05-26T23:59:59.000Z

262

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

E-Print Network (OSTI)

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

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

2012-01-01T23:59:59.000Z

263

Convergence of methods for coupling of microscopic and mesoscopic reaction-diffusion simulations  

E-Print Network (OSTI)

In this paper, three multiscale methods for coupling of mesoscopic (compartment-based) and microscopic (molecular-based) stochastic reaction-diffusion simulations are investigated. Two of the three methods that will be discussed in detail have been previously reported in the literature; the two-regime method (TRM) and the compartment-placement method (CPM). The third method that is introduced and analysed in this paper is the ghost cell method (GCM). Presented is a comparison of sources of error. The convergent properties of this error are studied as the time step $\\Delta t$ (for updating the molecular-based part of the model) approaches zero. It is found that the error behaviour depends on another fundamental computational parameter $h$, the compartment size in the mesoscopic part of the model. Two important limiting cases, which appear in applications, are considered: (i) \\Delta t approaches 0 and h is fixed; and (ii) \\Delta t approaches 0 and h approaches 0 such that \\Delta t/h^2 is fixed. The error for previously developed approaches (the TRM and CPM) converges to zero only in the limiting case (ii), but not in case (i). It is shown that the error of the GCM converges in the limiting case (i). Thus the GCM is superior to previous coupling techniques if the mesoscopic description is much coarser than the microscopic part of the model.

Mark B Flegg; Stefan Hellander; Radek Erban

2013-04-27T23:59:59.000Z

264

Microscopic models and effective equation of state in nuclear collisions at FAIR energies  

E-Print Network (OSTI)

Two microscopic models, UrQMD and QGSM, were employed to study the formation of locally equilibrated hot and dense nuclear matter in heavy-ion collisions at energies from 11.6 AGeV to 160 AGeV. Analysis was performed for the fixed central cubic cell of volume V = 125 fm**3 and for the expanding cell which followed the growth of the central area with uniformly distributed energy. To decide whether or not the equilibrium was reached, results of the microscopic calculations were compared to that of the statistical thermal model. Both dynamical models indicate that the state of kinetic, thermal and chemical equilibrium is nearly approached at any bombarding energy after a certain relaxation period. The higher the energy, the shorter the relaxation time. Equation of state has a simple linear dependence P = a(sqrt{s})*e, where a = c_s**2 is the sound velocity squared. It varies from 0.12 \\pm 0.01 at E_{lab} = 11.6 AGeV to 0.145 \\pm 0.005 at E_{lab} = 160 AGeV. Change of the slope in a(sqrt{s}) behavior occurs at E_...

Bravina, L; Bleibel, J; Bleicher, M; Burau, G; Faessler, Amand; Fuchs, C; Nilsson, M S; Stöcker, H; Tywoniuk, K; Zabrodin, E

2008-01-01T23:59:59.000Z

265

Real-Time and Post-Reaction Microscopic Structural Analysis of Biomass Undergoing Pyrolysis  

Science Conference Proceedings (OSTI)

The structural complexity of unprocessed plant tissues used for thermochemical conversion of biomass to fuels and energy impedes heat and mass transfer and may increase the occurrence of tar-forming secondary chemical reactions. At industrial scales, gas and liquid products trapped within large biomass particles may reduce net fuel yields and increase tars, impacting industrial operations and increasing overall costs. Real-time microscopic analysis of poplar (Populus sp.) wood samples undergoing anoxic, pyrolytic heat treatment has revealed a pattern of tissue and macropore expansion and collapse. Post-reaction structural analyses of biomass char (biochar) by light and transmission electron microscopy have provided direct structural evidence of pyrolysis product mass-transfer issues, including trapped pyrolysis products and cell wall compression, and have demonstrated the impact of heat-transfer problems on biomass particles. Finally, microscopic imaging has revealed that pyrolyzed/gasified biochars recovered from a fluidized bed reactor retain a similar pre-reaction basic plant tissue structure as the samples used in this study, suggesting that the phenomena observed here are representative of those that occur in larger scale reactors.

Haas, T. J.; Nimlos, M. R.; Donohoe, B. S.

2009-01-01T23:59:59.000Z

266

Transpiring purging access probe for particulate laden or hazardous environments  

SciTech Connect

An access probe for remote-sensing access through a viewing port, viewing volume, and access port into a vessel. The physical boundary around the viewing volume is partially formed by a porous sleeve lying between the viewing volume and a fluid conduit. In a first mode of operation, a fluid supplied to the fluid conduit encounters the porous sleeve and flows through the porous material to maintain the viewing volume free of ash or other matter. When additional fluid force is needed to clear the viewing volume, the pressure of the fluid flow is increased sufficiently to slidably translate the porous sleeve, greatly increasing the flow into the viewing volume. The porous sleeve is returned to position by an actuating spring. The access probe thereby provides for alternate modes of operation based on the pressure of an actuating fluid.

VanOsdol, John G

2013-12-03T23:59:59.000Z

267

ON THE MICROSCOPIC AND MACROSCOPIC ASPECTS OF NUCLEAR STRUCTURE WITH APPLICATIONS TO SUPERHEAVY NUCLEI  

SciTech Connect

The thesis is concerned with the relation between a microscopic approach and a macroscopic approach to the study of the nuclear binding energy as a function of neutron number, proton number and nuclear deformations. First of all we give a general discussion of the potential energy of a system which can be divided into a bulk region and a thin skin layer. We find that this energy can be written down in the usual liquid drop type of expression, i.e., in terms of the volume, the surface area and other macroscopic properties of the system. The discussion is illustrated by a study of noninteracting particles in an orthorhombic potential well with zero potential inside and infinite potential outside. The total energy is calculated both exactly (a microscopic approach) and also from a liquid drop type of expression (a macroscopic approach). It turns out that the latter approach reproduces the smooth average of the exact results very well. We next make a digression to study the saddle point shapes of a charged conducting drop on a pure liquid drop model. We compare the properties of a conducting drop with those of a drop whose charges are distributed uniformly throughout its volume. The latter is the usual model employed in the study of nuclear fission. We also determined some of the more important symmetric saddle point shapes. In the last part of the thesis we generalize a method due to Strutinski to synthesize a microscopic approach (the Nilsson model) and a macroscopic approach (the liquid drop model). The results are applied to realistic nuclei. The possible occurrence of shape isomers comes as a natural consequence of the present calculation. Their trends as a function of neutron and proton members are discussed and the results are tabulated. We also work out the stabilities of the predicted superheavy nuclei with proton number around 114 and neutron number around 184 and 196. Some of these nuclei appear to have extremely long life times. The possible experimental production of these superheavy nuclei are also discussed.

Tsang, Chin-Fu.

1969-05-22T23:59:59.000Z

268

Relativistic Brownian motion: From a microscopic binary collision model to the Langevin equation  

E-Print Network (OSTI)

The Langevin equation (LE) for the one-dimensional relativistic Brownian motion is derived from a microscopic collision model. The model assumes that a heavy point-like Brownian particle interacts with the lighter heat bath particles via elastic hard-core collisions. First, the commonly known, non-relativistic LE is deduced from this model, by taking into account the non-relativistic conservation laws for momentum and kinetic energy. Subsequently, this procedure is generalized to the relativistic case. There, it is found that the relativistic stochastic force is still $\\gd$-correlated (white noise) but does \\emph{no} longer correspond to a Gaussian white noise process. Explicit results for the friction and momentum-space diffusion coefficients are presented and discussed.

Jörn Dunkel; Peter Hänggi

2006-07-04T23:59:59.000Z

269

The effect of microscopic texture on the direct plasma surface passivation of Si solar cells  

SciTech Connect

Textured silicon surfaces are widely used in manufacturing of solar cells due to increasing the light absorption probability and also the antireflection properties. However, these Si surfaces have a high density of surface defects that need to be passivated. In this study, the effect of the microscopic surface texture on the plasma surface passivation of solar cells is investigated. The movement of 10{sup 5} H{sup +} ions in the texture-modified plasma sheath is studied by Monte Carlo numerical simulation. The hydrogen ions are driven by the combined electric field of the plasma sheath and the textured surface. The ion dynamics is simulated, and the relative ion distribution over the textured substrate is presented. This distribution can be used to interpret the quality of the Si dangling bonds saturation and consequently, the direct plasma surface passivation.

Mehrabian, S. [Laser and Plasma Research Institute, G.C., Shahid Beheshti University, Evin, Tehran 1983963113 (Iran, Islamic Republic of); Xu, S. [Plasma Sources and Applications Center, NIE, Nanyang Technological University, 637616 Singapore (Singapore); Qaemi, A. A. [Physics Department, G.C., Shahid Beheshti University, Evin, Tehran 1983963113 (Iran, Islamic Republic of); Shokri, B. [Laser and Plasma Research Institute, G.C., Shahid Beheshti University, Evin, Tehran 1983963113 (Iran, Islamic Republic of); Physics Department, G.C., Shahid Beheshti University, Evin, Tehran 1983963113 (Iran, Islamic Republic of); Chan, C. S. [Plasma Sources and Applications Center, NIE, Nanyang Technological University, 637616 Singapore (Singapore); Division of Microelectronics, School of EEE, Nanyang Technological University, 639798 Singapore (Singapore); Ostrikov, K. [Plasma Nanoscience Center Australia (PNCA), CSIRO Materials Science and Engineering, P.O. Box 218 Lindfield, NSW 2070 (Australia); Plasma Nanoscience, School of Physics, University of Sydney, Sydney, NSW 2006 (Australia); Institute for Superconducting and Electronic Materials (ISEM), University of Wollongong, NSW 2522 (Australia); School of Physics and Advanced Materials, University of Technology Sydney, Sydney, NSW 2006 (Australia); Plasma Sources and Applications Center, NIE, Nanyang Technological University, 637616 Singapore (Singapore)

2013-04-15T23:59:59.000Z

270

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

DOE Patents (OSTI)

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

de Jonge, Niels (Oak Ridge, TN)

2010-08-17T23:59:59.000Z

271

Analysis with electron microscope of multielement samples using pure element standards  

DOE Patents (OSTI)

This disclosure describes a method and modified analytical electron microscope for determining the concentration of elements in a multielement sample by exposing samples with differing thicknesses for each element to a beam of electrons. Simultaneously the electron dosage and x-ray intensities are measured for each sample of element to determine a ''K/sub AB/'' value to be used in the equation (I/sub A/I/sub B/) = K/sub AB/ (C/sub A//C/sub B/), where I is intensity and C is concentration for elements A and B. The multielement sample is exposed to determine the concentrations of the elements in the sample.

King, W.E.

1986-01-06T23:59:59.000Z

272

A microscopic model of electronic field noise heating in ion traps  

E-Print Network (OSTI)

Motional heating of ions in micro-fabricated traps is a challenge hindering experimental realization of large-scale quantum processing devices. Recently a series of measurements of the heating rates in surface-electrode ion traps characterized their frequency, distance, and temperature dependencies, but our understanding of the microscopic origin of this noise is still vague. In this work we develop a theoretical model for the electric field noise which is associated with a random distribution of adsorbed atoms on the trap electrode surface. By using first principle calculations of the fluctuating dipole moments of the adsorbed atoms we evaluate the distance, frequency and temperature dependence of the resulting electric field fluctuation spectrum.Our theory calculates the noise spectrum beyond the standard scenario of two-level fluctuators, by incorporating all the relevant vibrational states. The $1/f$ noise is shown to commence at roughly the frequency of the fundamental phonon transition rate and the $d^{...

Safavi-Naini, A; Weck, P; Sadeghpour, H R

2011-01-01T23:59:59.000Z

273

A Scanning Electron Microscope Facility for Characterization of Tritium Containing Materials  

SciTech Connect

A scanning electron microscope (SEM) facility for the examination of tritium-containing materials is operational at Mound Laboratory. The SEM is installed with the sample chamber incorporated as an integral part of an inert gas glovebox facility to enable easy handling of radioactive and pyrophoric materials. A standard SEM (ERTEC Model B-1) was modified to meet dimensional, operational, and safety-related requirements. A glovebox was designed and fabricated which permitted access with the gloves to all parts of the SEM sample chamber to facilitate detector and accessory replacement and repairs. A separate console combining the electron optical column and specimen chamber was interfaced to the glovebox by a custom-made, neoprene bellows so that the vibrations normally associated with the blowers and pumps were damped. Photomicrographs of tritiated pyrophoric materials show the usefulness of this facility. Some of the difficulties involved in the investigation of these materials are also discussed.

Downs, G. L.; Tucker, P. A.

1975-10-01T23:59:59.000Z

274

Search for microscopic black holes in pp collisions at sqrt(s) = 8 TeV  

E-Print Network (OSTI)

A search for microscopic black holes and string balls is presented, based on a data sample of pp collisions at sqrt(s) = 8 TeV recorded by the CMS experiment at the Large Hadron Collider and corresponding to an integrated luminosity of 12 inverse femtobarns. No excess of events with energetic multiparticle final states, typical of black hole production or of similar new physics processes, is observed. Given the agreement of the observations with the expected standard model background, which is dominated by QCD multijet production, 95% confidence limits are set on the production of semiclassical or quantum black holes, or of string balls, corresponding to the exclusions of masses below 4.3 to 6.2 TeV, depending on model assumptions. In addition, model-independent limits are set on new physics processes resulting in energetic multiparticle final states.

CMS Collaboration

2013-03-21T23:59:59.000Z

275

Microscopic Insights into the Electrochemical Behavior of Nonaqueous Electrolytes in Electric Double-Layer Capacitors  

Science Conference Proceedings (OSTI)

Electric double-layer capacitors (EDLCs) are electrical devices that store energy by adsorption of ionic species at the inner surface of porous electrodes. Compared with aqueous electrolytes, ionic liquid and organic electrolytes have the advantage of larger potential windows, making them attractive for the next generation of EDLCs with superior energy and power densities. The performance of both ionic liquid and organic electrolyte EDLCs hinges on the judicious selection of the electrode pore size and the electrolyte composition, which requires a comprehension of the charging behavior from a microscopic view. In this Perspective, we discuss predictions from the classical density functional theory (CDFT) on the dependence of the capacitance on the pore size for ionic liquid and organic electrolyte EDLCs. CDFT is applicable to electrodes with the pore size ranging from that below the ionic dimensionality to mesoscopic scales, thus unique for investigating the electrochemical behavior of the confined electrolytes for EDLC applications.

Jiang, Deen [ORNL; Wu, Jianzhong [University of California, Riverside

2013-01-01T23:59:59.000Z

276

Microscopic Insights into the Electrochemical Behavior of Non-aqueous Electrolytes in Supercapacitors  

Science Conference Proceedings (OSTI)

Electric double-layer capacitors (EDLC) are electrical devices that store energy by adsorption of ionic species at the inner surface of porous electrodes. Compared with aqueous electrolytes, ionic liquid and organic electrolytes have the advantage of larger potential windows, making them attractive for the next generation of EDLC with superior energy and power densities. The performance of both ionic liquid and organic electrolyte EDLC hinges on the judicious selection of the electrode pore size and the electrolyte composition that requires a comprehension of the charging behavior from a microscopic view. In this perspective, we discuss predictions from the classical density functional theory (CDFT) on the dependence of the capacitance on the pore size for ionic-liquid and organic-electrolyte EDLC. CDFT is applicable to electrodes with the pore size ranging from that below the ionic dimensionality to mesoscopic scales, thus unique for investigating the electrochemical behavior of the confined electrolytes for EDLC applications.

Jiang, Deen [ORNL; Wu, Jianzhong [ORNL

2013-01-01T23:59:59.000Z

277

Graphical template software for accurate micromanipulation in a scanning electron microscope  

SciTech Connect

Micromanipulation techniques in a scanning electron microscope (SEM) have been utilized for assembling micrometer-sized structures. The precision of the assembled microstructures has been limited by the poor accuracy of the SEM image. We have developed a software to assist the operator in the accurate assembly of microstructures in a SEM, in which computer-generated outlines of the target structure [graphical templates (GTs)] are superimposed on the monitor. The displayed GTs are distorted on the basis of the image properties of the SEM evaluated in advance. As a consequence, the operator can construct microstructures with a high precision only by maneuvering the manipulator so that the outline of each object perfectly overlaps the GT without any alteration of the electron optics or circuits for improving the image accuracy.

Kasaya, Takeshi [Nanotechnology Innovation Center, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047 (Japan); Miyazaki, Hideki T. [Quantum Dot Research Center, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047 (Japan)

2009-01-15T23:59:59.000Z

278

In situ nanomechanical testing in focused ion beam and scanning electron microscopes  

Science Conference Proceedings (OSTI)

The recent interest in size-dependent deformation of micro- and nanoscale materials has paralleled both technological miniaturization and advancements in imaging and small-scale mechanical testing methods. Here we describe a quantitative in situ nanomechanical testing approach adapted to a dual-beam focused ion beam and scanning electron microscope. A transducer based on a three-plate capacitor system is used for high-fidelity force and displacement measurements. Specimen manipulation, transfer, and alignment are performed using a manipulator, independently controlled positioners, and the focused ion beam. Gripping of specimens is achieved using electron-beam assisted Pt-organic deposition. Local strain measurements are obtained using digital image correlation of electron images taken during testing. Examples showing results for tensile testing of single-crystalline metallic nanowires and compression of nanoporous Au pillars will be presented in the context of size effects on mechanical behavior and highlight some of the challenges of conducting nanomechanical testing in vacuum environments.

Gianola, D. S. [Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104 (United States); Institute for Applied Materials, Karlsruhe Institute of Technology, Karlsruhe (Germany); Sedlmayr, A.; Moenig, R.; Kraft, O. [Institute for Applied Materials, Karlsruhe Institute of Technology, Karlsruhe (Germany); Volkert, C. A. [Institute for Materials Physics, Georg-August University of Goettingen, Goettingen (Germany); Major, R. C.; Cyrankowski, E.; Asif, S. A. S.; Warren, O. L. [Hysitron, Inc., Minneapolis, Minnesota 55344 (United States)

2011-06-15T23:59:59.000Z

279

Microscopic quantum structure of black hole and vacuum versus quantum statistical origin of gravity  

E-Print Network (OSTI)

The Planckon densely piled model of vacuum is proposed. Based on it, the microscopic quantum structure of Schwarzschild black hole and quantum statistical origin of its gravity are studied. It is shown that thermodynamic temperature equilibrium and mechanical acceleration balance make the space-time of the black hole horizon singular and Casimir effect works inside the horizon. This effect makes the inside vacuum have less zero fluctuation energy than the outside vacuum, and a temperature difference as well as gravity as thermal pressure are created. A dual relation between inside and outside regions of the black hole is found. By the dual relation, an attractor behaviour of the horizon surface is unveiled. Outside horizon, there exist thermodynamic non-equilibrium and mechanical non-balance which lead to outward centrifugal energy flow and inward gravitation energy flow, their compensation establishes local equilibrium. The lost vacuum energy in negative gravitation potential regions has been removed to the black hole surface to form a spherical Planckon shell with the thickness of Planckon diameter. All the particles absorbed by the black hole have fallen down to the horizon and converted into spin 1/2 radiation quanta made of standing waves on the horizon sphere with the mean energy related to Hawking-Unruh temperature, thermodynamic equilibrium and mechanical balance keep them stable and be tightly bound in the horizon. The gravitation mass 2M and physical mass $M$ of the black hole are calculated. The entropy of the black hole, calculated from the microscopic state number of the many-body system of radiation fermion quanta, is well consistent with Hawking. A radical modification of the temperature law of the black hole is made. The accelerating expansion of the universe yields the expansion cosmon and its energy density agrees with dark energy density.

Shun-Jin Wang

2012-12-24T23:59:59.000Z

280

A standard dose of radiation for microscopic disease is not appropriate  

SciTech Connect

Elective irradiation of sites of potential occult tumor spread is often part of a patient's radiation therapy program. The required radiation dose (D) depends on the probability that occult disease exists (P(occ)), the number of sites at risk (A), the number of tumor clonogens present (Ni), their radiation sensitivity, and the desired control rate. An exponential model of cell survival is used to quantify the importance of these factors. Control Probability = (1 - Pocc x (1 - e-Ni x (SF2)D/2))A; SF2 = surviving fraction after 2 Gy. Implications for clinical radiation therapy include: 1. Since the number of clonogens in an occult site may vary from 10 degrees to 10(8), Ni is the major determinant of the required dose. The intrinsic radiation sensitivity of the clonogens (SF2) is also extremely important in determining the dose. Other factors are less influential since they vary less. 2. The variability of Ni (8 logs) is larger than the variation in cell number seen with gross disease (1 cm3 versus 1000 cm3, 3 logs). When Ni approximately 10(8), the required dose approaches that needed for small volume gross disease (10(9) cells, 1 cm3). 3. The dose prescribed to elective sites should reflect the risk of occult disease based on the primary tumor site, stage, and grade. 4. Regions where clinicoradiologic evaluation is difficult (e.g., pelvis and obese neck) require higher doses because macroscopic tumor deposits may exist. 5. Relatively low doses (10 to 30 Gy) are often thought to be inadequate for microscopic tumor. However, similar doses have been reported to sterilize microscopic tumor in ovarian, rectal, bladder, breast, and head and neck carcinomas. Relatively low doses should not be discounted since they may be useful in select cases when normal tissue tolerances and/or previous irradiation treatment limit the radiation dose.

Marks, L.B. (Duke Univ. Medical Center, Durham, NC (USA))

1990-12-15T23:59:59.000Z

Note: This page contains sample records for the topic "microscope n2 purged" 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

The r-Process in Supernovae: Impact of New Microscopic Mass Formulas  

E-Print Network (OSTI)

The astrophysical origin of $r$-process nuclei remains a long-standing mystery. Although some astrophysical scenarios show some promise, many uncertainties involved in both the astrophysical conditions and in the nuclear properties far from the $\\beta$-stability have inhibited us from understanding the nature of the $r$-process. The purpose of the present paper is to examine the effects of the newly-derived microscopic Hartree-Fock-Bogoliubov (HFB) mass formulas on the $r$-process nucleosynthesis and analyse to what extent a solar-like $r$-abundance distribution can be obtained. The $r$-process calculations with the HFB-2 mass formula are performed, adopting the parametrized model of the prompt explosion from a collapsing O-Ne-Mg core for the physical conditions and compared with the results obtained with the HFB-7 and droplet-type mass formulas. Due to its weak shell effect at the neutron magic numbers in the neutron-rich region, the microscopic mass formulas (HFB-2 and HFB-7) give rise to a spread of the abundance distribution in the vicinity of the $r$-process peaks ($A = 130$ and 195). While this effect resolves the large underproduction at $A \\approx 115$ and 140 obtained with droplet-type mass formulas, large deviations compared to the solar pattern are found near the third $r$-process peak. It is shown that a solar-like $r$-process pattern can be obtained if the dynamical timescales of the outgoing mass trajectories are increased by a factor of about 2-3, or if the $\\beta$-decay rates are systematically increased by the same factor.

Shinya Wanajo; Stephane Goriely; Mathieu Samyn; Naoki Itoh

2004-01-21T23:59:59.000Z

282

Microscopic models and effective equation of state in nuclear collisions at FAIR energies  

E-Print Network (OSTI)

Two microscopic models, UrQMD and QGSM, were employed to study the formation of locally equilibrated hot and dense nuclear matter in heavy-ion collisions at energies from 11.6 AGeV to 160 AGeV. Analysis was performed for the fixed central cubic cell of volume V = 125 fm**3 and for the expanding cell which followed the growth of the central area with uniformly distributed energy. To decide whether or not the equilibrium was reached, results of the microscopic calculations were compared to that of the statistical thermal model. Both dynamical models indicate that the state of kinetic, thermal and chemical equilibrium is nearly approached at any bombarding energy after a certain relaxation period. The higher the energy, the shorter the relaxation time. Equation of state has a simple linear dependence P = a(sqrt{s})*e, where a = c_s**2 is the sound velocity squared. It varies from 0.12 \\pm 0.01 at E_{lab} = 11.6 AGeV to 0.145 \\pm 0.005 at E_{lab} = 160 AGeV. Change of the slope in a(sqrt{s}) behavior occurs at E_{lab} = 40 AGeV and can be assigned to the transition from baryon-rich to meson-dominated matter. The phase diagrams in the T - mu_B plane show the presence of kinks along the lines of constant entropy per baryon. These kinks are linked to the inelastic (i.e. chemical) freeze-out in the system.

L. Bravina; I. Arsene; J. Bleibel; M. Bleicher; G. Burau; Amand Faessler; C. Fuchs; M. S. Nilsson; H. Stoecker; K. Tywoniuk; E. Zabrodin

2008-04-09T23:59:59.000Z

283

Superconducting qubit as a quantum transformer routing entanglement between a microscopic quantum memory and a macroscopic resonator  

Science Conference Proceedings (OSTI)

We demonstrate experimentally the creation and measurement of an entangled state between a microscopic two-level system (TLS), formed by a defect in an oxide layer, and a macroscopic superconducting resonator, where their indirect interaction is mediated by an artificial atom, a superconducting persistent current qubit (PCQB). Under appropriate conditions, we found the coherence time of the TLS, the resonator, and the entangled state of these two are significantly longer than the Ramsey dephasing time of PCQB itself. This demonstrates that a PCQB can be used as a quantum transformer to address high coherence microscopic quantum memories by connecting them to macroscopic quantum buses.

Kemp, Alexander; Saito, Shiro; Semba, Kouichi [NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato Wakamiya Atsugi-shi, Kanagawa 243-0198 (Japan); Munro, William J. [NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato Wakamiya Atsugi-shi, Kanagawa 243-0198 (Japan); National Institute of Informatics 2-1-2 Hitotsubashi, Chiyoda ku, Tokyo 101-8430 (Japan); Nemoto, Kae [National Institute of Informatics 2-1-2 Hitotsubashi, Chiyoda ku, Tokyo 101-8430 (Japan)

2011-09-01T23:59:59.000Z

284

Microscopic linear liquid streams in vacuum: Injection of solvated biological samples into X-ray free electron lasers  

SciTech Connect

Microscopic linear liquid free-streams offer a means of gently delivering biological samples into a probe beam in vacuum while maintaining the sample species in a fully solvated state. By employing gas dynamic forces to form the microscopic liquid stream (as opposed to a conventional solid-walled convergent nozzle), liquid free-streams down to 300 nm diameter have been generated. Such 'Gas Dynamic Virtual Nozzles' (GDVN) are ideally suited to injecting complex biological species into an X-ray Free Electron Laser (XFEL) to determine the structure of the biological species via Serial Femtosecond Crystallography (SFX). GDVN injector technology developed for this purpose is described.

Doak, R. B.; DePonte, D. P.; Nelson, G.; Camacho-Alanis, F.; Ros, A.; Spence, J. C. H.; Weierstall, U. [Arizona State University, Tempe, AZ 85287-1504 (United States); Centre for Free-Electron Laser Science, DESY, D-22607 Hamburg (Germany); Arizona State University, Tempe, AZ 85287-1504 (United States)

2012-11-27T23:59:59.000Z

285

Nanoscale Energy-Filtered Scanning Confocal Electron Microscopy Using a Double-Aberration-Corrected Transmission Electron Microscope  

SciTech Connect

We demonstrate that a transmission electron microscope fitted with two spherical-aberration correctors can be operated as an energy-filtered scanning confocal electron microscope. A method for establishing this mode is described and initial results showing 3D chemical mapping with nanoscale sensitivity to height and thickness changes in a carbon film are presented. Importantly, uncorrected chromatic aberration does not limit the depth resolution of this technique and moreover performs an energy-filtering role, which is explained in terms of a combined depth and energy-loss response function.

Wang Peng; Behan, Gavin; Kirkland, Angus I.; Nellist, Peter D. [Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH (United Kingdom); Takeguchi, Masaki; Hashimoto, Ayako; Mitsuishi, Kazutaka [National Institute for Materials Science, 3-13 Sakura, Tsukuba, 305-0003 (Japan); Shimojo, Masayuki [Advanced Science Research Laboratory, Saitama Institute of Technology, 1690 Fusaiji, Fukaya 369-0293 (Japan)

2010-05-21T23:59:59.000Z

286

On a Theorem on sums of the form 1+2^(2^n)+2^(2^n+1)+...+2^(2^n+m) and a result linking Fermat with Mersenne numbers  

E-Print Network (OSTI)

In his book "250 Problems in Elementary Number Theory", W.Sierpinski shows that the numbers 1+2^(2^n)+2^(2^n+1) are divisible by 21; for n=1,2,.... In this paper, we prove a similar but more general result.Consider the natural numbers of the form I(n.m)= 1+2^(2^n)+2^(2^n+1)+...+2^(2^n+m).In Theorem 1 we prove that for every odd integer N greater than 1, there exist infinitely many natural numbers n and m such that the integers I(n.m) are divisible by N. We give an explicit construction of the numbers n and m, for a given N. As an example, when N=31, and with n=4k and m=94+124i, the numbers I(n,m) are divisible by 31. A similar example is offered for N=(31)(7)=217. In Theorem 2, we prove a result pertaining to Mersenne numbers.There are also three Corollaries in this work, one of which deals with Fermat numbers.

Konstantine "Hermes" Zelator

2008-06-09T23:59:59.000Z

287

WETTABILITY AND IMBIBITION: MICROSCOPIC DISTRIBUTION OF WETTING AND ITS CONSEQUENCES AT THE CORE AND FIELD SCALES  

SciTech Connect

The questions of reservoir wettability have been approached in this project from three directions. First, we have studied the properties of crude oils that contribute to wetting alteration in a reservoir. A database of more than 150 different crude oil samples has been established to facilitate examination of the relationships between crude oil chemical and physical properties and their influence on reservoir wetting. In the course of this work an improved SARA analysis technique was developed and major advances were made in understanding asphaltene stability including development of a thermodynamic Asphaltene Solubility Model (ASM) and empirical methods for predicting the onset of instability. The CO-Wet database is a resource that will be used to guide wettability research in the future. The second approach is to study crude oil/brine/rock interactions on smooth surfaces. Contact angle measurements were made under controlled conditions on mica surfaces that had been exposed to many of the oils in the CO-Wet database. With this wealth of data, statistical tests can now be used to examine the relationships between crude oil properties and the tendencies of those oils to alter wetting. Traditionally, contact angles have been used as the primary wetting assessment tool on smooth surfaces. A new technique has been developed using an atomic forces microscope that adds a new dimension to the ability to characterize oil-treated surfaces. Ultimately we aim to understand wetting in porous media, the focus of the third approach taken in this project. Using oils from the CO-Wet database, experimental advances have been made in scaling the rate of imbibition, a sensitive measure of core wetting. Application of the scaling group to mixed-wet systems has been demonstrated for a range of core conditions. Investigations of imbibition in gas/liquid systems provided the motivation for theoretical advances as well. As a result of this project we have many new tools for studying wetting at microscopic and macroscopic scales and a library of well-characterized fluids for use in studies of crude oil/brine/rock interactions.

Jill S. Buckley; Norman R. Morrow; Chris Palmer; Purnendu K. Dasgupta

2003-02-01T23:59:59.000Z

288

2003The Royal Microscopical Society Journal of Microscopy,Vol. 212, Pt 3 December 2003, pp. 254263  

E-Print Network (OSTI)

, The Netherlands Key words. Bioluminescence measurements, embedded instrumentation, fluorescence measurements fluid volume per well in real-time, and for monitoring the fluorescence associated with the production in ATP assays). We show that our detection limit for NADH fluorescence is 5 µm with a microscope

van Vliet, Lucas J.

289

Correction of distance-dependent blurring in projection data for fully three-dimensional electron microscopic reconstruction  

Science Conference Proceedings (OSTI)

We propose a method of correction for distance-dependent blurring, which is one of the limiting factors to achieving higher resolution in 3D reconstructions of biological specimens from 2D projections obtained by an electron microscope. Our proposed ... Keywords: contrast transfer function, distance-dependent blurring, electron microscopy, stationary phase

Joanna Klukowska; Gabor T. Herman; Ivan G. Kazantsev

2010-04-01T23:59:59.000Z

290

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

291

Scientists combine X-rays and microscopes for precise experiments | Argonne  

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

This insulator-coated "smart tip" for synchrotron X-ray scanning tunneling microscopy confines the signal detection to a tiny region of a sample. The nanofabricated tips have been developed by an Argonne team led by Argonne nanoscientist Volker Rose to improve the sensitivity of the SXSTM technique. To view a larger version of the image, click on it. This insulator-coated "smart tip" for synchrotron X-ray scanning tunneling microscopy confines the signal detection to a tiny region of a sample. The nanofabricated tips have been developed by an Argonne team led by Argonne nanoscientist Volker Rose to improve the sensitivity of the SXSTM technique. To view a larger version of the image, click on it. This insulator-coated "smart tip" for synchrotron X-ray scanning tunneling microscopy confines the signal detection to a tiny region of a sample. The nanofabricated tips have been developed by an Argonne team led by Argonne nanoscientist Volker Rose to improve the sensitivity of the SXSTM technique. To view a larger version of the image, click on it. Scientists combine X-rays and microscopes for precise experiments

292

Microscopic mechanism of charged-particle radioactivity and generalization of the Geiger-Nuttall law  

Science Conference Proceedings (OSTI)

A linear relation for charged-particle emissions is presented starting from the microscopic mechanism of the radioactive decay. It relates the logarithms of the decay half-lives with two variables, called {chi}{sup '} and {rho}{sup '}, which depend upon the Q values of the outgoing clusters as well as the masses and charges of the nuclei involved in the decay. This relation explains well all known cluster decays. It is found to be a generalization of the Geiger-Nuttall law in {alpha} radioactivity, and therefore we call it the universal decay law. Predictions of the most likely emissions of various clusters are presented by applying the law over the whole nuclear chart. It is seen that the decays of heavier clusters with nonequal proton and neutron numbers are mostly located in the trans-lead region. The emissions of clusters with equal protons and neutrons, like {sup 12}C and {sup 16}O, are possible in some neutron-deficient nuclei with Z{>=}54.

Qi, C. [School of Physics, and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871 (China); KTH - Royal Institute of Technology, Alba Nova University Center, SE-10691 Stockholm (Sweden); Xu, F. R. [School of Physics, and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871 (China); Center for Theoretical Nuclear Physics, National Laboratory for Heavy Ion Physics, Lanzhou 730000 (China); Liotta, R. J.; Wyss, R. [KTH - Royal Institute of Technology, Alba Nova University Center, SE-10691 Stockholm (Sweden); Zhang, M. Y.; Asawatangtrakuldee, C.; Hu, D. [School of Physics, and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871 (China)

2009-10-15T23:59:59.000Z

293

A high-pressure atomic force microscope for imaging in supercritical carbon dioxide  

Science Conference Proceedings (OSTI)

A high-pressure atomic force microscope (AFM) that enables in situ, atomic scale measurements of topography of solid surfaces in contact with supercritical CO{sub 2} (scCO{sub 2}) fluids has been developed. This apparatus overcomes the pressure limitations of the hydrothermal AFM and is designed to handle pressures up to 100 atm at temperatures up to ?350 K. A standard optically-based cantilever deflection detection system was chosen. When imaging in compressible supercritical fluids such as scCO{sub 2} , precise control of pressure and temperature in the fluid cell is the primary technical challenge. Noise levels and imaging resolution depend on minimization of fluid density fluctuations that change the fluid refractive index and hence the laser path. We demonstrate with our apparatus in situ atomic scale imaging of a calcite (CaCO{sub 3}) mineral surface in scCO{sub 2}; both single, monatomic steps and dynamic processes occurring on the (10{overbar 1}4) surface are presented. This new AFM provides unprecedented in situ access to interfacial phenomena at solid–fluid interfaces under pressure.

Lea, A.S.; Higgins, S.R.; Knauss, K.G.; Rosso, K.M.

2011-01-15T23:59:59.000Z

294

A high-pressure atomic force microscope for imaging in supercritical carbon dioxide  

Science Conference Proceedings (OSTI)

A high-pressure atomic force microscope (AFM) that enables in-situ, atomic scale measurements of topography of solid surfaces in contact with supercritical CO2 (scCO2) fluids has been developed. This apparatus overcomes the pressure limitations of the hydrothermal AFM and is designed to handle pressures up to 100 atm at temperatures up to ~ 350 K. A standard optically-based cantilever deflection detection system was chosen. When imaging in compressible supercritical fluids such as scCO2, precise control of pressure and temperature in the fluid cell is the primary technical challenge. Noise levels and imaging resolution depend on minimization of fluid density fluctuations that change the fluid refractive index and hence the laser path. We demonstrate with our apparatus in-situ atomic scale imaging of a calcite (CaCO3) mineral surface in scCO2; both single, monatomic steps and dynamic processes occurring on the (10Ż14) surface are presented. This new AFM provides unprecedented in-situ access to interfacial phenomena at solid-fluid interfaces under pressure.

Lea, Alan S.; Higgins, Steven R.; Knauss, Kevin G.; Rosso, Kevin M.

2011-04-26T23:59:59.000Z

295

Microcanonical Thermostatistics as Foundation of Thermodynamics. The microscopic origin of condensation and phase separations  

E-Print Network (OSTI)

Conventional thermo-statistics address infinite homogeneous systems within the canonical ensemble. However, some 150 years ago the original motivation of thermodynamics was the description of steam engines, i.e. boiling water. Its essential physics is the separation of the gas phase from the liquid. Of course, boiling water is inhomogeneous and as such cannot be treated by canonical thermo-statistics. Then it is not astonishing, that a phase transition of first order is signaled canonically by a Yang-Lee singularity. Thus it is only treated correctly by microcanonical Boltzmann-Planck statistics. This is elaborated in the present article. It turns out that the Boltzmann-Planck statistics is much richer and gives fundamental insight into statistical mechanics and especially into entropy. This can even be done to some extend rigorously and analytically. The microcanonical entropy has a very simple physical meaning: It measures the microscopic uncertainty that we have about the system, i.e. the number of points in $6N$-dim phase, which are consistent with our information about the system. It can rigorously be split into an ideal-gas part and a configuration part which contains all the physics and especially is responsible for all phase transitions. The deep and essential difference between ``extensive'' and ``intensive'' control parameters, i.e. microcanonical and canonical statistics, is exemplified by rotating, self-gravitating systems.

D. H. E. Gross

2004-11-16T23:59:59.000Z

296

Atomic Imaging Using Secondary Electrons in a Scanning Transmission Electron Microscope: Experimental Observations and Possible Mechanisms  

SciTech Connect

We report detailed investigation of high-resolution imaging using secondaryelectrons (SE) with a sub-nanometer probe in an aberration-corrected transmissionelectron microscope, Hitachi HD2700C. This instrument also allows us to acquire the corresponding annular dark-field (ADF) images both simultaneously and separately. We demonstrate that atomic SE imaging is achievable for a wide range of elements, from uranium to carbon. Using the ADF images as a reference, we studied the SE image intensity and contrast as functions of applied bias, atomic number, crystal tilt, and thickness to shed light on the origin of the unexpected ultrahigh resolution in SE imaging. We have also demonstrated that the SE signal is sensitive to the terminating species at a crystal surface. Apossiblemechanism for atomic-scale SE imaging is proposed. The ability to image both the surface and bulk of a sample at atomic-scale is unprecedented, and can have important applications in the field of electron microscopy and materials characterization.

Su, D.; Inada, H.; Egerton, R.F.; Konno, M.; Wua, L.; Ciston, J.; Wall, J.; Zhu, Y.

2011-11-11T23:59:59.000Z

297

A microscopic model of electronic field noise heating in ion traps  

E-Print Network (OSTI)

Motional heating of ions in micro-fabricated traps is a challenge hindering experimental realization of large-scale quantum processing devices. Recently a series of measurements of the heating rates in surface-electrode ion traps characterized their frequency, distance, and temperature dependencies, but our understanding of the microscopic origin of this noise is still vague. In this work we develop a theoretical model for the electric field noise which is associated with a random distribution of adsorbed atoms on the trap electrode surface. By using first principle calculations of the fluctuating dipole moments of the adsorbed atoms we evaluate the distance, frequency and temperature dependence of the resulting electric field fluctuation spectrum.Our theory calculates the noise spectrum beyond the standard scenario of two-level fluctuators, by incorporating all the relevant vibrational states. The $1/f$ noise is shown to commence at roughly the frequency of the fundamental phonon transition rate and the $d^{-4}$ dependence with distance of the ion from the electrode surface is established.

A. Safavi-Naini; P. Rabl; P. Weck; H. R. Sadeghpour

2011-06-10T23:59:59.000Z

298

Generalized microscopic theory of ion selectivity in voltage-gated ion channels  

E-Print Network (OSTI)

Ion channels are specific proteins present in the membranes of living cells. They control the flow of specific ions through a cell, initiated by an ion channel's electrochemical gradient. In doing so, they control important physiological processes such as muscle contraction and neuronal connectivity, which cannot be properly activated if these channels go haywire, leading to life-threatening diseases and psychological disorders. Here, we will develop a generalized microscopic theory of ion selectivity applicable to KcsA, Na$_{\\rm v}$Rh and Ca$_{\\rm v}$ (L-type) ion channels. We unambiguously expose why and how a given ion-channel can be highly selective, and yet has a conductance of the order of one million ions per second, or higher. We will identify and prove the correct physico-biochemical mechanisms that are responsible for the high selectivity of a particular ion in a given ion channel. The above mechanisms consist of five conditions, which can be directly associated to these parameters - (i) dehydration energy, (ii) concentration of the "correct" ions (iii) Coulomb-van-der-Waals attraction, (iv) pore and ionic sizes, and indirectly to (v) the thermodynamic stability and (vi) the "knock-on" assisted permeation.

Andrew Das Arulsamy

2012-09-12T23:59:59.000Z

299

Evidence for the microscopic formation of mixed-symmetry states from magnetic moment measurements  

SciTech Connect

Using the transient field technique, the magnetic moments of the second excited 2{sup +} states in {sup 92,94}Zr have been measured for the first time. The large positive g factors, g(2{sub 2}{sup +};{sup 92}Zr)=+0.76(50) and g(2{sub 2}{sup +};{sup 94}Zr)=+0.88(27), which are in contrast to the known negative g factors of the 2{sub 1}{sup +} states, are found to be a consequence of weak proton-neutron coupling combined with the Z=40 subshell closure. From their large M1 transition strengths to the 2{sub 1}{sup +} states, in earlier works an assignment to the 2{sub 2}{sup +} states as proton-neutron symmetric and mixed-symmetry states has been made, which are now found to be polarized in their proton-neutron content. This fact allows to identify the underlying microscopic main configurations in the wave functions, which form the building blocks of symmetric and mixed-symmetry states in this region as valence nucleons are added and shell structure changes.

Werner, V.; Ai, H.; Casperson, R. J.; Casten, R. F.; Eckel, S.; Heinz, A.; Lambie-Hanson, C.; McCutchan, E. A.; Meyer, D. A.; Qian, J.; Schmidt, A.; Williams, E.; Winkler, R. [Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06520-8124 (United States); Benczer-Koller, N.; Kumbartzki, G.; Boutachkov, P. [Department of Physics and Astronomy, Rutgers University, New Brunswick, New Jersey 08903 (United States); Holt, J. D. [TRIUMF, Vancouver (Canada); Stefanova, E. [Department of Physics and Astronomy, Rutgers University, New Brunswick, New Jersey 08903 (United States); Institute for Nuclear Research and Nuclear Energy, BAS, 1784 Sofia (Bulgaria); Perry, M. [Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06520-8124 (United States); Department of Physics, Florida State University, Florida (United States); Pietralla, N. [Institut fuer Kernphysik, TU Darmstadt, D-64289 Darmstadt (Germany)] (and others)

2008-09-15T23:59:59.000Z

300

Microscopic description of isoscalar giant resonance excitations in ??Ca and ąą?SN nuclei  

E-Print Network (OSTI)

This thesis presents a microscopic description of isoscalar giant resonance excitations in ??Ca and ąą? Sn nuclei within the self-consistent Skyrme-Hartree-Fock-Random-Phase-Approximation (HF-RPA) theory. Such characteristic features of the Isoscalar Giant Resonance as strength function, transition density and cross-sections for ??Ca and ąą?Sn nuclei are obtained. In this analysis, the SL1 Skyrme interaction associated with 230 MeV for the value of nuclear matter incompressibility coefficient K is chosen. The selection of nuclei is based on the availability of recent experimental results from Texas A&M University. The coordinate space formulation of the RPA in terms of Green's function is employed to obtain isoscalar monopole and dipole transition strength distributions for ??Ca and ąą?Sn nuclei. Calculations are performed with the discretized single-particle continuum. Theoretical transition strength distributions are used to find quantities of interest such as energy positions of resonance states, sum rules and average resonance energies. The cross-section of 240 MeV ?-particle scattering on the above nuclei are analysed within the Distorted Wave Born Approximation (DWBA) using transition densities obtained from the HF-RPA calculations. From this analysis the cross-sections for ISGDR excitations are obtained and compared with the recent experimental data obtained at the Cyclotron Institute, Texas A&M University.

Karki, Bhishma

2000-01-01T23:59:59.000Z

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301

Solving the Accelerator-Condenser Coupling Problem in a Nanosecond Dynamic Transmission Electron Microscope  

Science Conference Proceedings (OSTI)

We describe a modification to a transmission electron microscope (TEM) that allows it to briefly (using a pulsed-laser-driven photocathode) operate at currents in excess of 10 mA while keeping the effects of condenser lens aberrations to a minimum. This modification allows real-space imaging of material microstructure with a resolution of order 10 nm over regions several {micro}m across with an exposure time of 15 ns. This is more than 6 orders of magnitude faster than typical video-rate TEM imaging. The key is the addition of a weak magnetic lens to couple the large-diameter high-current beam exiting the accelerator into the acceptance aperture of a conventional TEM condenser lens system. We show that the performance of the system is essentially consistent with models derived from ray tracing and finite element simulations. The instrument can also be operated as a conventional TEM by using the electron gun in a thermionic mode. The modification enables very high electron current densities in {micro}m-sized areas and could also be used in a non-pulsed system for high-throughput imaging and analytical TEM.

Reed, B W; LaGrange, T; Shuttlesworth, R M; Gibson, D J; Campbell, G H; Browning, N D

2009-12-29T23:59:59.000Z

302

Microscopic Description of Entanglements in Polyethylene Networks and Melts: Strong, Weak, Pairwise, and Collective Attributes  

E-Print Network (OSTI)

We present atomistic molecular dynamics simulations of two Polyethylene systems where all entanglements are trapped: a perfect network, and a melt with grafted chain ends. We examine microscopically at what level topological constraints can be considered as a collective entanglement effect, as in tube model theories, or as certain pairwise uncrossability interactions, as in slip-link models. A pairwise parameter, which varies between these limiting cases, shows that, for the systems studied, the character of the entanglement environment is more pairwise than collective. We employ a novel methodology, which analyzes entanglement constraints into a complete set of pairwise interactions, similar to slip links. Entanglement confinement is assembled by a plethora of links, with a spectrum of confinement strengths, from strong to weak. The strength of interactions is quantified through a link `persistence', which is the fraction of time for which the links are active. By weighting links according to their strength, we show that confinement is imposed mainly by the strong ones, and that the weak, trapped, uncrossability interactions cannot contribute to the low frequency modulus of an elastomer, or the plateau modulus of a melt. A self-consistent scheme for mapping topological constraints to specific, strong binary links, according to a given entanglement density, is proposed and validated. Our results demonstrate that slip links can be viewed as the strongest pairwise interactions of a collective entanglement environment. The methodology developed provides a basis for bridging the gap between atomistic simulations and mesoscopic slip link models.

Stefanos D. Anogiannakis; Christos Tzoumanekas; Doros N. Theodorou

2012-12-06T23:59:59.000Z

303

A Study of Elementary Excitations of Liquid Helium-4 Using Macro-orbital Microscopic Theory  

E-Print Network (OSTI)

Energy of elementary excitations and the anomalous nature of small Q phonons in He-II are studied by using our macro-orbital microscopic theory of a system of interacting bosons (cond-mat/0606571). It is observed that : (i) the experimental E(Q) of He-II not only agrees with our theoretical relation $E(Q) = \\hbar^2Q^2/4mS(Q)$ but also supports an important conclusion of Price that S(0) should have zero value for quantum fluids, and (ii) Feynman's energy of excitations $E(Q)_{Fyn} = \\hbar^2Q^2/2mS(Q)$ equals approximately to $2E(Q)_{exp}$ even at low Q. Three problems with the Feynman's inference that $E(Q)_{Fyn}$ has good agreement with $E(Q)_{exp}$ at low Q are identified. It is argued that the theory can also be used to understand similar spectrum of the BEC state of a dilute gas reported by O'Dell et al.

Yatendra S. Jain

2006-09-18T23:59:59.000Z

304

X-ray holographic microscopy using the atomic-force microscope  

Science Conference Proceedings (OSTI)

The present authors have been seeking for some time to improve the resolution of holographic microscopy and have engaged in a continuing series of experiments using the X1A soft x-ray undulator beam line at Brookhaven. The principle strategy for pushing the resolution lower in these experiments has been the use of polymer resists as x-ray detectors and the primary goal has been to develop the technique to become useful for examining wet biological material. In the present paper the authors report on progress in the use of resist for high-spatial-resolution x-ray detection. This is the key step in in-line holography and the one which sets the ultimate limit to the image resolution. The actual recording has always been quite easy, given a high-brightness undulator source, but the difficult step was the readout of the recorded pattern. The authors describe in what follows how they have built a special instrument: an atomic force microscope (AFM) to read holograms recorded in resist. They report the technical reasons for building, rather than buying, such an instrument and they give details of the design and performance of the device. The authors also describe the first attempts to use the system for real holography and the authors show results of both recorded holograms and the corresponding reconstructed images. Finally, the authors try to analyze the effect that these advances are likely to have on the future prospects for success in applications of x-ray holography and the degree to which the other technical systems that are needed for such success are available or within reach.

Howells, M.R. [Lawrence Berkeley Lab., CA (United States); Jacobsen, C.J.; Lindaas, S. [State Univ. of New York, Stony Brook, NY (United States). Physics Dept.

1993-09-01T23:59:59.000Z

305

Optimal geometries and harmonic vibrational frequencies of the global minima of water clusters (H2O)n, n=2-6, and several hexamer local minima at the CCSD(T) level of theory  

SciTech Connect

We report the first optimum geometries and harmonic vibrational frequencies for the ring pentamer and several water hexamer (prism, cage, cyclic and two book) at the CCSD(T)/aug-cc-pVDZ level of theory. All five hexamer isomer minima previously reported by MP2 are also minima on the CCSD(T) potential energy surface (PES). In addition, all CCSD(T) minimum energy structures for the n=2-6 cluster isomers are quite close to the ones previously obtained by MP2 on the respective PESs, as confirmed by a modified Procrustes analysis that quantifies the difference between any two cluster geometries. The CCSD(T) results confirm the cooperative effect of the homodromic ring networks (systematic contraction of the nearest-neighbor (nn) intermolecular separations with cluster size) previously reported by MP2, albeit with O-O distances shorter by ~0.02 Ĺ, indicating that MP2 overcorrects this effect. The harmonic frequencies at the minimum geometries were obtained by the double differentiation of the CCSD(T) energy using an efficient scheme based on internal coordinates that reduces the number of required single point energy evaluations by ~15% when compared to the corresponding double differentiation using Cartesian coordinates. Negligible differences between MP2 and CCSD(T) are found for the librational modes, while uniform increases of ~15 and ~25 cm-1 are observed for the bending and “free” OH harmonic frequencies. The largest differences between MP2 and CCSD(T) are observed for the harmonic hydrogen bonded frequencies. The CCSD(T) red shifts from the monomer frequencies (??) are smaller than the MP2 ones, due to the fact that the former produces shorter elongations (?R) of the respective hydrogen bonded OH lengths from the monomer value with respect to the latter. Both the MP2 and CCSD(T) results for the hydrogen bonded frequencies were found to closely follow the relation - ?? = s ? ?R, with a rate of s = 20.3 cm-1 / 0.001 Ĺ. The CCSD(T) harmonic frequencies, when corrected using the MP2 anharmonicities obtained from second order vibrational perturbation theory (VPT2), produce anharmonicCCSD(T) estimates that are within < 60 cm-1 from the measured infrared (IR) active bands of the n=2-6 clusters and furthermore trace the observed red shifts with respect to the monomer (??) quite accurately. The energetic order between the various hexamer isomers on the PES (prism has the lowest energy) previously reported at MP2 was found to be preserved at the CCSD(T) level, whereas the inclusion of anharmonic corrections further stabilizes the cage among the hexamer isomers.

Miliordos, Evangelos; Apra, Edoardo; Xantheas, Sotiris S.

2013-09-21T23:59:59.000Z

306

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

Science Conference Proceedings (OSTI)

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; McKean, Pat; Tyliszczak, Tolek; Warwick, Tony [Advanced Light Source, Lawrence Berkeley Laboratory, Berkeley, California (United States); Ade, Harald [Department of Physics, North Carolina State University, Raleigh, North Carolina (United States); Attwood, David [Center for Xray Optics, Lawrence Berkeley Laboratory, Berkeley, California (United States); Hitchcock, Adam [Brockhouse Institute for Materials Research, McMaster University, Hamilton, Ontario (Canada); Mitchell, Gary [DOW Chemical Company, Midland, Michigan (United States); Monteiro, Paulo [Dept. Civil and Environmental Engineering, University of California, Berkeley, California (United States)

2010-06-23T23:59:59.000Z

307

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

Science Conference Proceedings (OSTI)

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

308

Beamline 1.4.4  

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

4 Print 4 Print Infrared spectromicroscopy Scientific disciplines: Biology, correlated electron systems, environmental science, geology, chemistry, polymers, soft materials GENERAL BEAMLINE INFORMATION Operational Yes Proposal cycle Proposals for General Sciences Beamlines (6-month cycle) Source characteristics Bend magnet Energy range 0.05-1.5 eV Frequency range 800 - 10,000 cm-1 Interferometer resolution up to 0.125 cm-1 Endstations Thermo Nicolet Nexus 870 FTIR, Continuum XL IR microscope (N2 purged) Characteristics Computerized sample stage, 0.1-micron resolution; reflection, transmission, and attenuated total reflectance (ATR) modes; differential interference contrast (DIC), polarizing and UV fluorescence optics Spatial resolution Diffraction-limited (~wavelength); x-y stage with 0.1 micron accuracy

309

Beamline 1.4.3  

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

3 Print 3 Print FTIR spectromicroscopy Scientific disciplines: Biology, correlated electron systems, environmental science, geology, chemistry, polymers, soft materials GENERAL BEAMLINE INFORMATION Operational Yes Proposal cycle Proposals for General Sciences Beamlines (6-month cycle) Source characteristics Bend magnet Energy range 0.05-1.2 eV Frequency range 650 - 10,000 cm-1 Interferometer resolution Up to 0.125 cm-1 Endstations Nicolet Magna 760 FTIR, Nic-Plan IR Microscope (N2 purged) Characteristics Motorized sample stage, 0.1-micron resolution, reflection, transmission, and grazing-incidence reflection modes Spatial resolution Diffraction-limited (~wavelength); x-y stage with 0.1 micron accuracy Detectors MCT-A (mercury cadmium telluride) Spot size at sample 2-10 µm (diffraction-limited)

310

Beamline 1.4.3  

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1.4.3 Print 1.4.3 Print FTIR spectromicroscopy Scientific disciplines: Biology, correlated electron systems, environmental science, geology, chemistry, polymers, soft materials GENERAL BEAMLINE INFORMATION Operational Yes Proposal cycle Proposals for General Sciences Beamlines (6-month cycle) Source characteristics Bend magnet Energy range 0.05-1.2 eV Frequency range 650 - 10,000 cm-1 Interferometer resolution Up to 0.125 cm-1 Endstations Nicolet Magna 760 FTIR, Nic-Plan IR Microscope (N2 purged) Characteristics Motorized sample stage, 0.1-micron resolution, reflection, transmission, and grazing-incidence reflection modes Spatial resolution Diffraction-limited (~wavelength); x-y stage with 0.1 micron accuracy Detectors MCT-A (mercury cadmium telluride) Spot size at sample

311

Beamline 1.4.4  

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4 Print 4 Print Infrared spectromicroscopy Scientific disciplines: Biology, correlated electron systems, environmental science, geology, chemistry, polymers, soft materials GENERAL BEAMLINE INFORMATION Operational Yes Proposal cycle Proposals for General Sciences Beamlines (6-month cycle) Source characteristics Bend magnet Energy range 0.05-1.5 eV Frequency range 800 - 10,000 cm-1 Interferometer resolution up to 0.125 cm-1 Endstations Thermo Nicolet Nexus 870 FTIR, Continuum XL IR microscope (N2 purged) Characteristics Computerized sample stage, 0.1-micron resolution; reflection, transmission, and attenuated total reflectance (ATR) modes; differential interference contrast (DIC), polarizing and UV fluorescence optics Spatial resolution Diffraction-limited (~wavelength); x-y stage with 0.1 micron accuracy

312

Beamline 1.4.3  

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

1.4.3 Print 1.4.3 Print FTIR spectromicroscopy Scientific disciplines: Biology, correlated electron systems, environmental science, geology, chemistry, polymers, soft materials GENERAL BEAMLINE INFORMATION Operational Yes Proposal cycle Proposals for General Sciences Beamlines (6-month cycle) Source characteristics Bend magnet Energy range 0.05-1.2 eV Frequency range 650 - 10,000 cm-1 Interferometer resolution Up to 0.125 cm-1 Endstations Nicolet Magna 760 FTIR, Nic-Plan IR Microscope (N2 purged) Characteristics Motorized sample stage, 0.1-micron resolution, reflection, transmission, and grazing-incidence reflection modes Spatial resolution Diffraction-limited (~wavelength); x-y stage with 0.1 micron accuracy Detectors MCT-A (mercury cadmium telluride) Spot size at sample

313

Beamline 1.4.3  

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

Beamline 1.4.3 Print Beamline 1.4.3 Print FTIR spectromicroscopy Scientific disciplines: Biology, correlated electron systems, environmental science, geology, chemistry, polymers, soft materials GENERAL BEAMLINE INFORMATION Operational Yes Proposal cycle Proposals for General Sciences Beamlines (6-month cycle) Source characteristics Bend magnet Energy range 0.05-1.2 eV Frequency range 650 - 10,000 cm-1 Interferometer resolution Up to 0.125 cm-1 Endstations Nicolet Magna 760 FTIR, Nic-Plan IR Microscope (N2 purged) Characteristics Motorized sample stage, 0.1-micron resolution, reflection, transmission, and grazing-incidence reflection modes Spatial resolution Diffraction-limited (~wavelength); x-y stage with 0.1 micron accuracy Detectors MCT-A (mercury cadmium telluride) Spot size at sample

314

Beamline 1.4.3  

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

Beamline 1.4.3 Print Beamline 1.4.3 Print FTIR spectromicroscopy Scientific disciplines: Biology, correlated electron systems, environmental science, geology, chemistry, polymers, soft materials GENERAL BEAMLINE INFORMATION Operational Yes Proposal cycle Proposals for General Sciences Beamlines (6-month cycle) Source characteristics Bend magnet Energy range 0.05-1.2 eV Frequency range 650 - 10,000 cm-1 Interferometer resolution Up to 0.125 cm-1 Endstations Nicolet Magna 760 FTIR, Nic-Plan IR Microscope (N2 purged) Characteristics Motorized sample stage, 0.1-micron resolution, reflection, transmission, and grazing-incidence reflection modes Spatial resolution Diffraction-limited (~wavelength); x-y stage with 0.1 micron accuracy Detectors MCT-A (mercury cadmium telluride) Spot size at sample

315

Beamline 1.4.3  

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

3 Print 3 Print FTIR spectromicroscopy Scientific disciplines: Biology, correlated electron systems, environmental science, geology, chemistry, polymers, soft materials GENERAL BEAMLINE INFORMATION Operational Yes Proposal cycle Proposals for General Sciences Beamlines (6-month cycle) Source characteristics Bend magnet Energy range 0.05-1.2 eV Frequency range 650 - 10,000 cm-1 Interferometer resolution Up to 0.125 cm-1 Endstations Nicolet Magna 760 FTIR, Nic-Plan IR Microscope (N2 purged) Characteristics Motorized sample stage, 0.1-micron resolution, reflection, transmission, and grazing-incidence reflection modes Spatial resolution Diffraction-limited (~wavelength); x-y stage with 0.1 micron accuracy Detectors MCT-A (mercury cadmium telluride) Spot size at sample 2-10 µm (diffraction-limited)

316

Beamline 1.4.3  

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

3 Print 3 Print FTIR spectromicroscopy Scientific disciplines: Biology, correlated electron systems, environmental science, geology, chemistry, polymers, soft materials GENERAL BEAMLINE INFORMATION Operational Yes Proposal cycle Proposals for General Sciences Beamlines (6-month cycle) Source characteristics Bend magnet Energy range 0.05-1.2 eV Frequency range 650 - 10,000 cm-1 Interferometer resolution Up to 0.125 cm-1 Endstations Nicolet Magna 760 FTIR, Nic-Plan IR Microscope (N2 purged) Characteristics Motorized sample stage, 0.1-micron resolution, reflection, transmission, and grazing-incidence reflection modes Spatial resolution Diffraction-limited (~wavelength); x-y stage with 0.1 micron accuracy Detectors MCT-A (mercury cadmium telluride) Spot size at sample 2-10 µm (diffraction-limited)

317

Beamline 1.4.3  

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

3 Print 3 Print FTIR spectromicroscopy Scientific disciplines: Biology, correlated electron systems, environmental science, geology, chemistry, polymers, soft materials GENERAL BEAMLINE INFORMATION Operational Yes Proposal cycle Proposals for General Sciences Beamlines (6-month cycle) Source characteristics Bend magnet Energy range 0.05-1.2 eV Frequency range 650 - 10,000 cm-1 Interferometer resolution Up to 0.125 cm-1 Endstations Nicolet Magna 760 FTIR, Nic-Plan IR Microscope (N2 purged) Characteristics Motorized sample stage, 0.1-micron resolution, reflection, transmission, and grazing-incidence reflection modes Spatial resolution Diffraction-limited (~wavelength); x-y stage with 0.1 micron accuracy Detectors MCT-A (mercury cadmium telluride) Spot size at sample 2-10 µm (diffraction-limited)

318

Beamline 1.4.3  

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

3 Print 3 Print FTIR spectromicroscopy Scientific disciplines: Biology, correlated electron systems, environmental science, geology, chemistry, polymers, soft materials GENERAL BEAMLINE INFORMATION Operational Yes Proposal cycle Proposals for General Sciences Beamlines (6-month cycle) Source characteristics Bend magnet Energy range 0.05-1.2 eV Frequency range 650 - 10,000 cm-1 Interferometer resolution Up to 0.125 cm-1 Endstations Nicolet Magna 760 FTIR, Nic-Plan IR Microscope (N2 purged) Characteristics Motorized sample stage, 0.1-micron resolution, reflection, transmission, and grazing-incidence reflection modes Spatial resolution Diffraction-limited (~wavelength); x-y stage with 0.1 micron accuracy Detectors MCT-A (mercury cadmium telluride) Spot size at sample 2-10 µm (diffraction-limited)

319

Beamline 1.4.3  

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

Beamline 1.4.3 Print Beamline 1.4.3 Print FTIR spectromicroscopy Scientific disciplines: Biology, correlated electron systems, environmental science, geology, chemistry, polymers, soft materials GENERAL BEAMLINE INFORMATION Operational Yes Proposal cycle Proposals for General Sciences Beamlines (6-month cycle) Source characteristics Bend magnet Energy range 0.05-1.2 eV Frequency range 650 - 10,000 cm-1 Interferometer resolution Up to 0.125 cm-1 Endstations Nicolet Magna 760 FTIR, Nic-Plan IR Microscope (N2 purged) Characteristics Motorized sample stage, 0.1-micron resolution, reflection, transmission, and grazing-incidence reflection modes Spatial resolution Diffraction-limited (~wavelength); x-y stage with 0.1 micron accuracy Detectors MCT-A (mercury cadmium telluride) Spot size at sample

320

Beamline 1.4.3  

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

1.4.3 Print 1.4.3 Print FTIR spectromicroscopy Scientific disciplines: Biology, correlated electron systems, environmental science, geology, chemistry, polymers, soft materials GENERAL BEAMLINE INFORMATION Operational Yes Proposal cycle Proposals for General Sciences Beamlines (6-month cycle) Source characteristics Bend magnet Energy range 0.05-1.2 eV Frequency range 650 - 10,000 cm-1 Interferometer resolution Up to 0.125 cm-1 Endstations Nicolet Magna 760 FTIR, Nic-Plan IR Microscope (N2 purged) Characteristics Motorized sample stage, 0.1-micron resolution, reflection, transmission, and grazing-incidence reflection modes Spatial resolution Diffraction-limited (~wavelength); x-y stage with 0.1 micron accuracy Detectors MCT-A (mercury cadmium telluride) Spot size at sample

Note: This page contains sample records for the topic "microscope n2 purged" 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

Beamline 1.4.4  

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

4 Print 4 Print Infrared spectromicroscopy Scientific disciplines: Biology, correlated electron systems, environmental science, geology, chemistry, polymers, soft materials GENERAL BEAMLINE INFORMATION Operational Yes Proposal cycle Proposals for General Sciences Beamlines (6-month cycle) Source characteristics Bend magnet Energy range 0.05-1.5 eV Frequency range 800 - 10,000 cm-1 Interferometer resolution up to 0.125 cm-1 Endstations Thermo Nicolet Nexus 870 FTIR, Continuum XL IR microscope (N2 purged) Characteristics Computerized sample stage, 0.1-micron resolution; reflection, transmission, and attenuated total reflectance (ATR) modes; differential interference contrast (DIC), polarizing and UV fluorescence optics Spatial resolution Diffraction-limited (~wavelength); x-y stage with 0.1 micron accuracy

322

Beamline 1.4.3  

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

3 Print 3 Print FTIR spectromicroscopy Scientific disciplines: Biology, correlated electron systems, environmental science, geology, chemistry, polymers, soft materials GENERAL BEAMLINE INFORMATION Operational Yes Proposal cycle Proposals for General Sciences Beamlines (6-month cycle) Source characteristics Bend magnet Energy range 0.05-1.2 eV Frequency range 650 - 10,000 cm-1 Interferometer resolution Up to 0.125 cm-1 Endstations Nicolet Magna 760 FTIR, Nic-Plan IR Microscope (N2 purged) Characteristics Motorized sample stage, 0.1-micron resolution, reflection, transmission, and grazing-incidence reflection modes Spatial resolution Diffraction-limited (~wavelength); x-y stage with 0.1 micron accuracy Detectors MCT-A (mercury cadmium telluride) Spot size at sample 2-10 µm (diffraction-limited)

323

Beamline 1.4.4  

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

4 Print 4 Print Infrared spectromicroscopy Scientific disciplines: Biology, correlated electron systems, environmental science, geology, chemistry, polymers, soft materials GENERAL BEAMLINE INFORMATION Operational Yes Proposal cycle Proposals for General Sciences Beamlines (6-month cycle) Source characteristics Bend magnet Energy range 0.05-1.5 eV Frequency range 800 - 10,000 cm-1 Interferometer resolution up to 0.125 cm-1 Endstations Thermo Nicolet Nexus 870 FTIR, Continuum XL IR microscope (N2 purged) Characteristics Computerized sample stage, 0.1-micron resolution; reflection, transmission, and attenuated total reflectance (ATR) modes; differential interference contrast (DIC), polarizing and UV fluorescence optics Spatial resolution Diffraction-limited (~wavelength); x-y stage with 0.1 micron accuracy

324

Beamline 1.4.3  

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

1.4.3 Print 1.4.3 Print FTIR spectromicroscopy Scientific disciplines: Biology, correlated electron systems, environmental science, geology, chemistry, polymers, soft materials GENERAL BEAMLINE INFORMATION Operational Yes Proposal cycle Proposals for General Sciences Beamlines (6-month cycle) Source characteristics Bend magnet Energy range 0.05-1.2 eV Frequency range 650 - 10,000 cm-1 Interferometer resolution Up to 0.125 cm-1 Endstations Nicolet Magna 760 FTIR, Nic-Plan IR Microscope (N2 purged) Characteristics Motorized sample stage, 0.1-micron resolution, reflection, transmission, and grazing-incidence reflection modes Spatial resolution Diffraction-limited (~wavelength); x-y stage with 0.1 micron accuracy Detectors MCT-A (mercury cadmium telluride) Spot size at sample

325

Ion and electron beam nanofabrication of the which-way double-slit experiment in a transmission electron microscope  

Science Conference Proceedings (OSTI)

We have realized a which-way experiment closely resembling the original Feynman's proposal exploiting focused ion beam milling to prepare two nanoslits and electron beam induced deposition to grow, selectively over one of them, electron transparent layers of low atomic number amorphous material to realize a which-way detector for high energy electrons. By carrying out the experiment in an electron microscope equipped with an energy filter, we show that the inelastic scattering of electron transmitted through amorphous layers of different thicknesses provides the control of the dissipative interaction process responsible for the localization phenomena which cancels out the interference effects.

Frabboni, Stefano [Department of Physics, University of Modena and Reggio Emilia and CNR-Institute of Nanoscience-S3, via G. Campi 213/a, 41100 Modena (Italy); Gazzadi, Gian Carlo [CNR-Institute of Nanoscience-S3, via G. Campi 213/a, 41100 Modena (Italy); Pozzi, Giulio [Department of Physics, University of Bologna, viale B. Pichat 6/2, 40127 Bologna (Italy)

2010-12-27T23:59:59.000Z

326

A UNIFIED MICROSCOPIC-MACROSCOPIC MONTE CARLO SIMULATION OF GAS-GRAIN CHEMISTRY IN COLD DENSE INTERSTELLAR CLOUDS  

SciTech Connect

For the first time, we report a unified microscopic-macroscopic Monte Carlo simulation of gas-grain chemistry in cold interstellar clouds in which both the gas-phase and the grain-surface chemistry are simulated by a stochastic technique. The surface chemistry is simulated with a microscopic Monte Carlo method in which the chemistry occurs on an initially flat surface. The surface chemical network consists of 29 reactions initiated by the accreting species H, O, C, and CO. Four different models are run with diverse but homogeneous physical conditions including temperature, gas density, and diffusion-barrier-to-desorption energy ratio. As time increases, icy interstellar mantles begin to grow. Our approach allows us to determine the morphology of the ice, layer by layer, as a function of time, and to ascertain the environment or environments for individual molecules. Our calculated abundances can be compared with observations of ices and gas-phase species, as well as the results of other models.

Chang Qiang [Department of Chemistry, University of Virginia, Charlottesville, VA 22904 (United States); Herbst, Eric [Also at Departments of Astronomy and Physics, University of Virginia, Charlottesville, VA 22904, USA. (United States)

2012-11-10T23:59:59.000Z

327

Generator-coordinate-method with conjugate parameters and the unification of microscopic theories for large amplitude collective motion  

SciTech Connect

A dynamic theory of large amplitude collective motion of many particle systems is presented which is relevant, for example, to nuclear fission. The theory is microscopic and makes use of a collective path, i.e. a suitably constructed set of distorted nonequilibrium Slater determinants. The approach is a generalization of the generator coordinate method (GCM) and improves its dynamic aspects by extending it to a pair of conjugate generator parameters q and p (DGCM). The problems connected with redundancy and superfluous degrees of freedom are solved by prediagonalizing the local oscillations about each point of the dynamic collective basis vertical-barq,p>. For adiabatic large amplitude collective motion a Schroedinger equation is derived which appears to be nearly identical to the one obtained by a consistent quantization of semiclassical approaches as e.g. the adiabatic time dependent Hartree-Fock theory (ATDHF). In turn a collective path constructed by ATDHF proves to be particularly suited for being used in the present DGCM formalism. Altogether the formalism unifies two classes of microscopic approaches to collective motion, viz. the quantum mechanical GCM and the classical theories like cranking and ATDHF.

Goeke, K.; Reinhard, P.

1980-02-01T23:59:59.000Z

328

A compact, sample-in-atmospheric-pressure soft x-ray microscope developed at Pohang Light Source  

Science Conference Proceedings (OSTI)

A full-field transmission soft x-ray microscope (TXM) was developed at the Pohang Light Source. With a 2 mm diameter condenser zone plate and a 40 nm outermost-zone-width objective zone plate, the TXM's achieved spatial resolution is better than 50 nm at the photon energy of 500 eV (wavelength: 2.49 nm). The TXM is portable and mounted in tandem with a 7B1 spectroscopy end station. The sample position is outside the vacuum, allowing for quick sample changes and enhanced in situ experimental capability. In addition, the TXM is pinhole-free and easy to align, having commercial mounts located outside the vacuum components.

Lim, Jun; Shin, Hyun-Joon [Pohang Accelerator Laboratory, POSTECH, San31, Pohang 790-784 (Korea, Republic of); Department of Physics, POSTECH, San31, Pohang 790-784 (Korea, Republic of); Chae, Keun Hwa [Materials Science and Technology Research Division, KIST, Seoul 130-791 (Korea, Republic of); Hwang, Chan-Cuk; Hwang, Han-Na [Pohang Accelerator Laboratory, POSTECH, San31, Pohang 790-784 (Korea, Republic of); Hong, Chung Ki [Department of Physics, POSTECH, San31, Pohang 790-784 (Korea, Republic of)

2010-06-15T23:59:59.000Z

329

Microscopically-based energy density functionals for nuclei using the density matrix expansion: Implementation and pre-optimization  

E-Print Network (OSTI)

In a recent series of papers, Gebremariam, Bogner, and Duguet derived a microscopically based nuclear energy density functional by applying the Density Matrix Expansion (DME) to the Hartree-Fock energy obtained from chiral effective field theory (EFT) two- and three-nucleon interactions. Due to the structure of the chiral interactions, each coupling in the DME functional is given as the sum of a coupling constant arising from zero-range contact interactions and a coupling function of the density arising from the finite-range pion exchanges. Since the contact contributions have essentially the same structure as those entering empirical Skyrme functionals, a microscopically guided Skyrme phenomenology has been suggested in which the contact terms in the DME functional are released for optimization to finite-density observables to capture short-range correlation energy contributions from beyond Hartree-Fock. The present paper is the first attempt to assess the ability of the newly suggested DME functional, which has a much richer set of density dependencies than traditional Skyrme functionals, to generate sensible and stable results for nuclear applications. The results of the first proof-of-principle calculations are given, and numerous practical issues related to the implementation of the new functional in existing Skyrme codes are discussed. Using a restricted singular value decomposition (SVD) optimization procedure, it is found that the new DME functional gives numerically stable results and exhibits a small but systematic reduction of our test $\\chi^2$ function compared to standard Skyrme functionals, thus justifying its suitability for future global optimizations and large-scale calculations.

M. Stoitsov; M. Kortelainen; S. K. Bogner; T. Duguet; R. J. Furnstahl; B. Gebremariam; N. Schunck

2010-09-17T23:59:59.000Z

330

Search for microscopic black holes in a like-sign dimuon final state using large track multiplicity with the ATLAS detector  

E-Print Network (OSTI)

A search is presented for microscopic black holes in a like-sign dimuon final state in proton--proton collisions at sqrt(s)= 8 TeV. The data were collected with the ATLAS detector at the Large Hadron Collider in 2012 and correspond to an integrated luminosity of 20.3 fb-1. Using a high track multiplicity requirement, 0.6 +- 0.2 background events from Standard Model processes are predicted and none observed. This result is interpreted in the context of low-scale gravity models and 95% CL lower limits on microscopic black hole masses are set for different model assumptions.

ATLAS Collaboration

2013-08-19T23:59:59.000Z

331

The Nature of the Distinctive Microscopic Features in R5(SixGe1-x)4 Magnetic Refrigeration Materials  

Science Conference Proceedings (OSTI)

Magnetic refrigeration is a promising technology that offers a potential for high energy efficiency. The giant magnetocaloric effect of the R{sub 5}(Si{sub x}, Ge{sub 1-x}){sub 4} alloys (where R=rare-earth and O {le} x {le} 1), which was discovered in 1997, make them perfect candidates for magnetic refrigeration applications. In this study the microstructures of Gd{sub 5}(Si{sub x}Ge{sub 1-x}){sub 4} alloys have been characterized using electron microscopy techniques, with the focus being on distinctive linear features first examined in 1999. These linear features have been observed in R{sub 5}(Si{sub x}, Ge{sub 1-x}){sub 4} alloys prepared from different rare-earths (Gd, Tb, Dy and Er) with different crystal structures (Gd{sub 5}Si{sub 4}-type orthorhombic, monoclinic and Gd{sub 5}Ge{sub 4}-type orthorhombic). Systematic scanning electron microscope studies revealed that these linear features are actually thin-plates, which grow along specific directions in the matrix material. The crystal structure of the thin-plates has been determined as hexagonal with lattice parameters a=b=8.53 {angstrom} and c=6.40 {angstrom} using selected area diffraction (SAD). Energy dispersive spectroscopy analysis, carried out in both scanning and transmission electron microscopes, showed that the features have a composition approximating to R{sub 5}(Si{sub x},Ge{sub 1-x}){sub 3}.phase. Orientation relationship between the matrix and the thin-plates has been calculated as [- 1010](1-211){sub p}//[010](10-2){sub m}. The growth direction of the thin plates are calculated as (22 0 19) and (-22 0 19) by applying the Ag approach of Zhang and Purdy to the SAD patterns of this system. High Resolution TEM images of the Gd{sub 5}Ge{sub 4} were used to study the crystallographic relationship. A terrace-ledge structure was observed at the interface and a 7{sup o} rotation of the reciprocal lattices with respect to each other, consistent with the determined orientation relationship, was noted. Both observations are consistent with the stated hypothesis that the growth direction of the thin-plates is parallel to an invariant line direction. Based on the terrace-ledge structure of the thin-plate interface a displacive-diffusional growth mechanism has been proposed to explain the rapid formation of the R{sub 5}(Si{sub x},Ge{sub 1-x}){sub 3} plates.

Ozan Ugurlu

2006-05-01T23:59:59.000Z

332

Design and performance of an ultra-high vacuum scanning tunneling microscope operating at dilution refrigerator temperatures and high magnetic fields  

E-Print Network (OSTI)

We describe the construction and performance of a scanning tunneling microscope (STM) capable of taking maps of the tunneling density of states with sub-atomic spatial resolution at dilution refrigerator temperatures and high (14 T) magnetic fields. The fully ultra-high vacuum system features visual access to a two-sample microscope stage at the end of a bottom-loading dilution refrigerator, which facilitates the transfer of in situ prepared tips and samples. The two-sample stage enables location of the best area of the sample under study and extends the experiment lifetime. The successful thermal anchoring of the microscope, described in detail, is confirmed through a base temperature reading of 20 mK, along with a measured electron temperature of 250 mK. Atomically-resolved images, along with complementary vibration measurements, are presented to confirm the effectiveness of the vibration isolation scheme in this instrument. Finally, we demonstrate that the microscope is capable of the same level of perform...

Misra, Shashank; Drozdov, Ilya K; Seo, Jungpil; Gyenis, Andras; Kingsley, Simon C J; Jones, Howard; Yazdani, Ali

2013-01-01T23:59:59.000Z

333

Automatic Seedpoint Selection and Tracing of Microstructures in the Knife-Edge Scanning Microscope Mouse Brain Data Set  

E-Print Network (OSTI)

The Knife-Edge Scanning Microscope (KESM) enables imaging of an entire mouse brain at sub-micrometer resolution. By using the data sets from the KESM, we can trace the neuronal and vascular structures of the whole mouse brain. I investigated effective methods for automatic seedpoint selection on 3D data sets from the KESM. Furthermore, based on the detected seedpoints, I counted the total number of somata and traced the neuronal structures in the KESM data sets. In the first step, the acquired images from KESM were preprocessed as follows: inverting, noise filtering and contrast enhancement, merging, and stacking to create 3D volumes. Second, I used a morphological object detection algorithm to select seedpoints in the complex neuronal structures. Third, I used an interactive 3D seedpoint validation and a multi-scale approach to identify incorrectly detected somata due to the dense overlapping structures. Fourth, I counted the number of somata to investigate regional differences and morphological features of the mouse brain. Finally, I traced the neuronal structures using a local maximum intensity projection method that employs moving windows. The contributions of this work include reducing time required for setting seedpoints, decreasing the number of falsely detected somata, and improving 3D neuronal reconstruction and analysis performance.

Kim, Dongkun

2011-08-01T23:59:59.000Z

334

Robust and highly performant ring detection algorithm for 3d particle tracking using 2d microscope imaging  

E-Print Network (OSTI)

Three-dimensional particle tracking is an essential tool in studying dynamics under the microscope, namely, cellular trafficking, bacteria taxis, fluid dynamics in microfluidics devices. The 3d position of a fluorescent particle can be determined using 2d imaging alone, by measuring the diffraction rings generated by an out-of-focus particle, imaged on a single camera. Here I present a ring detection algorithm exhibiting a high detection rate, which is robust to the challenges arising from particles vicinity. It is capable of real time analysis thanks to its high performance and low memory footprint. Many of the algorithmic concepts introduced can be advantageous in other cases, particularly for sparse data. The implementation is based on open-source and cross-platform software packages only, making it easy to distribute and modify. The image analysis algorithm, which is an offspring of the full 3d circle Hough transform, addresses the need to efficiently trace the trajectories of several particles concurrently, when their number in not necessarily fixed, by solving a classification problem. The current implementation is robust to ring occlusion, inclusions and overlaps, which allows resolving particles even when near to each other. It is implemented in a microfluidics experiment allowing real-time multi-particle tracking at 70Hz, achieving a detection rate which exceeds 94% and only 1% false-detection.

Eldad Afik

2013-10-02T23:59:59.000Z

335

In Situ Tensile Testing of Single Crystal Molybdenum Alloy Fibers with Various Dislocation Densities in a Scanning Electron Microscope  

SciTech Connect

In-situ tensile tests have been performed in a dual beam focused ion beam and scanning electron microscope on as-grown and prestrained single-crystal molybdenum-alloy (Mo-alloy) fibers. The fibers had approximately square cross sections with submicron edge lengths and gauge lengths in the range of 9-41 {mu}m. In contrast to previously observed yield strengths near the theoretical strength of 10 GPa in compression tests of {approx}1-3-{mu}m long pillars made from similar Mo-alloy single crystals, a wide scatter of yield strengths between 1 and 10 GPa was observed in the as-grown fibers tested in tension. Deformation was dominated by inhomogeneous plastic events, sometimes including the formation of Lueders bands. In contrast, highly prestrained fibers exhibited stable plastic flow, significantly lower yield strengths of {approx}1 GPa, and stress-strain behavior very similar to that in compression. A simple, statistical model incorporating the measured dislocation densities is developed to explain why the tension and compression results for the as-grown fibers are different.

George, Easo P [ORNL; Johanns, K. [University of Tennessee, Knoxville (UTK); Sedlmayr, A. [Karlsruhe Institute of Technology, Karlsruhe, Germany; Phani, P. Sudharshan [University of Tennessee, Knoxville (UTK); Monig, R. [Karlsruhe Institute of Technology, Karlsruhe, Germany; Kraft, O. [Karlsruhe Institute of Technology, Karlsruhe, Germany; Pharr, George M [University of Tennessee, Knoxville (UTK) & Oak Ridge National Laboratory (ORNL)

2012-01-01T23:59:59.000Z

336

Theory and use of modern microscopical methods with applications to studies of wetlands microbial community dynamics. Final performance reports  

SciTech Connect

Funds were granted to the University of Southwestern Louisiana to coordinate and offer a summer enhancement institute for science teachers. Following are highlights from that institute: (1) 20 teachers from Louisiana attended the institute as students; (2) institute faculty included staff members from USL`s Departments of Biology, Mathematics, and Education and 3 principal scientists plus technicians from the Southern Science Center; (3) the institute began June 5, 1995 and ended June 30, 1995, and it featured daily lectures, laboratory exercises, examinations, and field trips--assignments for students included journal keeping, lesson plan development, and presentations, the student`s journal entries proved valuable for evaluating institute activities, students received copies of lesson plans developed at the institute, videos entitled ``Pond Life Diversity`` and ``Chesapeake: The Twilight Estuary,`` a guide to ``Free-lining Freshwater Protozoa,`` a graphing calculator, 2 x 2 slide set of pond life, software or hardware (selected by the teacher to meet specific needs), a field manual for water quality monitoring laboratory exercises (Project Green), and a book on Benchmarks for Science Literacy; (4) follow-up measures included the following--a newsletter disseminated by USL but written with teacher input; making equipment (such as a trinocular compound microscope and video monitor) and materials and supplies available to the teachers and their students in the classroom; and mentoring between USL and SSC staff and the teachers during the school year. Attached to this report are copies of the institute agenda and lesson plans developed in the institute.

NONE

1995-12-31T23:59:59.000Z

337

A Better Microscope  

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

microscopio mejor microscopio mejor Avanzar Volver Principal ESTOY PERDIDO!!! Cuando Ud. utiliza ondas para detectar el mundo físico el problema con el que se enfrenta es que la calidad de la imagen está limitada por la longitud de onda que usted use. Nuestros ojos son sensibles a la luz visible, que tiene una longitud de onda del orden de los 0.0000005 metros. Esta longitud de onda es lo suficientemente pequeña como para que en nuestra vida diaria no notemos el problema de resolución asociado con la longitud de onda, ya que en general no necesitamos ver objetos que tengan tamaños del orden de los 0.0000005 metros. Sin embargo, la longitud de onda de la luz visible es demasiado grande para analizar cualquier objeto más pequeño que una célula. Para observar objetos bajo grandes aumentos, se deben usar ondas con menor longitud de

338

Analytical Electron Microscope  

Science Conference Proceedings (OSTI)

... a conventional parallel electron energy-loss spectrometer (EELS) to record spectra of the energy losses experienced by the beam electrons as they ...

2012-10-01T23:59:59.000Z

339

Electron microscopic evaluation and fission product identification of irradiated TRISO coated particles from the AGR-1 experiment: A preliminary Study  

Science Conference Proceedings (OSTI)

ABSTRACT Post-irradiation examination of coated particle fuel from the AGR-1 experiment is in progress at Idaho National Laboratory and Oak Ridge National Laboratory. In this presentation a brief summary of results from characterization of microstructures in the coating layers of selected irradiated fuel particles with burnup of 11.3% and 19.3% FIMA will be given. The main objective of the characterization were to study irradiation effects, fuel kernel porosity, layer debonding, layer degradation or corrosion, fission-product precipitation, grain sizes, and transport of fission products from the kernels across the TRISO layers. Characterization techniques such as scanning electron microscopy, transmission electron microscopy, energy dispersive spectroscopy, and wavelength dispersive spectroscopy were used. A new approach to microscopic quantification of fission-product precipitates is also briefly demonstrated. The characterization emphasized fission-product precipitates in the SiC-IPyC interface, SiC layer and the fuel-buffer interlayer, and provided significant new insights into mechanisms of fission-product transport. Although Pd-rich precipitates were identified at the SiC-IPyC interlayer, no significant SiC-layer thinning was observed for the particles investigated. Characterization of these precipitates highlighted the difficulty of measuring low concentration Ag in precipitates with significantly higher concentrations of contain Pd and U. Different approaches to resolving this problem are discussed. Possible microstructural differences between particles with high and low releases of Ag particles are also briefly discussed, and an initial hypothesis is provided to explain fission-product precipitate compositions and locations. No SiC phase transformations or debonding of the SiC-IPyC interlayer as a result of irradiation were observed. Lessons learned from the post-irradiation examination are described and future actions are recommended.

I J van Rooyen; D E Janney; B D Miller; J L Riesterer; P A Demkowicz

2012-10-01T23:59:59.000Z

340

Gas-grain chemistry in cold interstellar cloud cores with a microscopic Monte Carlo approach to surface chemistry  

E-Print Network (OSTI)

AIM: We have recently developed a microscopic Monte Carlo approach to study surface chemistry on interstellar grains and the morphology of ice mantles. The method is designed to eliminate the problems inherent in the rate-equation formalism to surface chemistry. Here we report the first use of this method in a chemical model of cold interstellar cloud cores that includes both gas-phase and surface chemistry. The surface chemical network consists of a small number of diffusive reactions that can produce molecular oxygen, water, carbon dioxide, formaldehyde, methanol and assorted radicals. METHOD: The simulation is started by running a gas-phase model including accretion onto grains but no surface chemistry or evaporation. The starting surface consists of either flat or rough olivine. We introduce the surface chemistry of the three species H, O and CO in an iterative manner using our stochastic technique. Under the conditions of the simulation, only atomic hydrogen can evaporate to a significant extent. Although it has little effect on other gas-phase species, the evaporation of atomic hydrogen changes its gas-phase abundance, which in turn changes the flux of atomic hydrogen onto grains. The effect on the surface chemistry is treated until convergence occurs. We neglect all non-thermal desorptive processes. RESULTS: We determine the mantle abundances of assorted molecules as a function of time through 2x10^5 yr. Our method also allows determination of the abundance of each molecule in specific monolayers. The mantle results can be compared with observations of water, carbon dioxide, carbon monoxide, and methanol ices in the sources W33A and Elias 16. Other than a slight underproduction of mantle CO, our results are in very good agreement with observations.

Q. Chang; H. M. Cuppen; E. Herbst

2007-04-20T23:59:59.000Z

Note: This page contains sample records for the topic "microscope n2 purged" 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

Particle Formation from Pulsed Laser Irradiation of SootAggregates studied with scanning mobility particle sizer, transmissionelectron microscope and near-edge x-ray absorption fine structure.  

Science Conference Proceedings (OSTI)

We investigated the physical and chemical changes induced in soot aggregates exposed to laser radiation using a scanning mobility particle sizer, a transmission electron microscope, and a scanning transmission x-ray microscope to perform near-edge x-ray absorption fine structure spectroscopy. Laser-induced nanoparticle production was observed at fluences above 0.12 J/cm(2) at 532 nm and 0.22 J/cm(2) at 1064 nm. Our results indicate that new particle formation proceeds via (1) vaporization of small carbon clusters by thermal or photolytic mechanisms, followed by homogeneous nucleation, (2) heterogeneous nucleation of vaporized carbon clusters onto material ablated from primary particles, or (3) both processes.

Michelsen, Hope A.; Tivanski, Alexei V.; Gilles, Mary K.; vanPoppel, Laura H.; Dansson, Mark A.; Buseck, Peter R.; Buseck, Peter R.

2007-02-20T23:59:59.000Z

342

TransForum v9n2 - PHEV Research  

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

PHEVs Need Further Research for Acceptable Payback PHEVs Need Further Research for Acceptable Payback Fuel Consumption as a Function of Distance PHEV graph In order to double the fuel displacement obtained with a 4kWh battery, the battery size had to be quadrupled to 16kWh. Aymeric Rousseau and his team at Argonne studied the impact of real-world drive cycles on the fuel efficiency and costs of different plug-in hybrid electric vehicle (PHEV) configurations. They found that while different PHEV configurations all demonstrated great potential for replacing gasoline (with less gasoline consumed as more electricity was used), the benefit of adding a larger battery seemed to decrease with increasing battery pack size. "In general, the larger the battery, the more fuel saved," said Rousseau, principal investigator of the vehicle modeling and simulation

343

SSQ V1 N2_6june11_FINAL  

National Nuclear Security Administration (NNSA)

2 2011 2 2011 Comments Questions or comments regarding the Stockpile Stewardship Quarterly should be directed to Terri.Batuyong@nnsa.doe.gov Technical Editor: Douglas Drake, Publication Editor: Millicent Mischo Inside This Issue Stockpile Stewardship Quarterly Defense Programs Stockpile Stewardship in Action Volume 1, Number 2 What do physicists and paparazzi have in common? They know that a picture is worth a thousand words! For this issue of the Stockpile Stewardship Quarterly, the theme is advances in imaging diagnostics. Not only do the images tell a story, as asserted in the old axiom, about the dynamics of high-explosives, laser or pulsed power-driven events, but they are also becoming very quantitative. The

344

TransForum v4n2 - Diesel Reformer  

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1 ARGONNE SCIENTISTS TEAM UP TO DEVELOP NEW DIESEL REFORMER Liu tests diesel reformer Argonne's Di-Jia Liu conducted extensive testing of the diesel reformer; his experiments are...

345

TransForum v9n2 - FASTRAX  

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

recent results of hydrogen combustion engine research at the SAE World Congress in Detroit, Michigan, April 2009. The work, co-authored by Abhijeet Nande and Jeff Naber (both...

346

TransForum v8n2 - Challenge X Winner  

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

University team designed and engineered a through-the-road (TTR) parallel hybrid electric vehicle with all-wheel drive using a 1.9L GM sourced turbocharged direct injection...

347

TransForum v9n2 - Low Temperature Combustion  

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

Low-Temperature Combustion Knocks Out NOx, Saves Fuel and Money One of the hottest concepts in clean diesel technology is low-temperature combustion (LTC). Engineers from Argonne's...

348

TransForum v9n2 - Green Fuel Depot  

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

> Alternative Fuels Autonomie Batteries Downloadable Dynamometer Database Engines Green Racing GREET Hybrid Electric Vehicles Hydrogen & Fuel Cells Materials Modeling,...

349

TransForum v8n2 - ALMS Green Challenge  

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

> Alternative Fuels Autonomie Batteries Downloadable Dynamometer Database Engines Green Racing GREET Hybrid Electric Vehicles Hydrogen & Fuel Cells Materials Modeling,...

350

K2TiF6-Ti/N2  

Science Conference Proceedings (OSTI)

A Comparative Study of Liquid Phase Sintering vs Spark-plasma Sintering of ... Assessment of Electrical Contact Resistance in Spark-plasma Sintering Graphite  ...

351

TransForum v4n2 - Argonne Researchers  

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

research that the society specifically mentioned in its citation were his involvement in heat exchanger development at Cummins Engine Co. But for Sekar, his greatest achievements...

352

TransForum v9n2 - KATECH MOU  

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

On May 16, 2009, Argonne entered into a memorandum of understanding (MOU) with the Korea Automotive Technology Institute (KATECH). Steven Chu, the U.S. Department of Energy...

353

Vent Stack Liquid N2 RTD Temperature Sensor  

SciTech Connect

This engineering note documents the installation of two temperature sensing RTD's in the BC's. Previously, the temperature sensing device used in all three cryostats consisted of a FNAL designed liquid sensing probe (see EN-168, and drawing ME-273505). This device was necessary because of the concern that overfilling LN2 into the main vent line during cooldown could create an undesirable back pressure on the relief valves or rupture disks. This could possibly hinder the relieving of argon gas at the required flow rate in a safety situation. The probe was installed on the CC, and has been operating perfectly, therefore, this probe will not be changed. Figure 1 shows the location of TS232E, the CC liquid sensing probe. Note that the probe is located downstream of the condenser outlet valve (PV210N), therefore, it effectively operates under atmospheric pressure. On the BC's, however, the probe was originally installed at a different location, upstream of the condenser outlet valve (PV110N or PV310N). This resulted in the probe effectively sensing the condenser pressure, which varied from approximately 30 psia to 60 psia during cooldown. The changing pressure meant that the corresponding temperature at which liquid appeared also changed. The probe then became inaccurate, especially at higher condenser pressures, when the probe would be fail to trip at the higher liquid temperature. The solution was to replace the original probe with an RTD. This involved using the PLC to compare the temperature sensed by the RTD to the liquid saturation temperature, calculated using the measured condenser pressure. A formula was created to calculate the saturation temperature from the condenser pressure. This formula was derived by curve fitting points taken from the NBS Technical Note 129 for nitrogen. A 2nd order equation was used to fit the points, since the accuracy was not very important for temperature comparison. The entire equation was then shifted so that the curve was above all of the actual points. This was done to insure that the formula would provide higher temperatures, so the comparison to the RTD would be conservative, switching before the temperature reached saturation. Figure 2 shows the curve used to fit the data points. The lower curve is the actual data, and the higher curve is the formula to be used. Using the formula derived, the PLC calculates a conservative saturation temperature from the condenser pressure. The condenser pressure is measured by PT110N or PT310N, on the ECN and ECS, respectively. The transmitters are Rosemount 0-75 psia pressure transmitters. The PLC then compares the calculated temperature to the measured temperature from the RTD's, EIl32E and EI332E, which are Omega platinum RTD probes, model PR-14-2-100-1/4-12-E. If the measured temperature drops below the calculated saturation temperature, an alarm signals on the view page, and the PLC automatically closes the two inlet condenser valves (PV 101N and PV102N, or PV301N and PV302N). As a final note, there are various advantages and disadvantages to using the RTD's instead of the original probe. The advantages are that the RTD's provide constant monitoring of the temperature, whereas the probe was basically designed as a switch. The RTD's are more accurate in that they can respond over the range of the condenser pressure. The probe was designed to operate under atmospheric pressure. The only disadvantage of the RTD's is that they sense temperature, therefore, they cannot distinguish saturated GN2 from liquid, while the probe was designed specifically to do so. Overall, however, the RTD's provide an acceptable solution to the problem of liquid sensing in the vent line. Figure 3 shows the final location of the RTD on the ECN. The ECS location is the same.

Wu, J.; /Fermilab

1991-11-27T23:59:59.000Z

354

TransForum v3n2 - GAPC  

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new study sponsored by General Motors Corporation (GM) and supported by Argonne, BP, ExxonMobil, and Shell may bring us one step closer to finding the answer. On March 21, 2001, at...

355

Some ternary Diophantine equations of signature (n, n, 2) - CECM  

E-Print Network (OSTI)

with n = 4, 5, 6, 7, 9, 11, 13, 17 and D ? {2, 3, 5, 6, 10, 11, 13, 17}. ... n, D that occur in the statement and for each n ? 17, there are some values of D for which  ...

356

TransForum v8n2 - Challenge X Winner  

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

announced in Washington, D.C. Seventeen teams have been selected from the U.S. and Canada to participate in this prestigious event. EcoCAR is the latest in a 19-year series of...

357

TransForum v9n2 -ECOCAR 2009 Winner  

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

of the U.S. Department of Energy and Lisa Raitt, Minister of Natural Resources, Canada (both far right). The six-day competition was held in Toronto, Ontario, Canada, and...

358

TransForum v9n2 - Smart Grid  

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

Argonne transportation researchers created this interactive model to demonstrate how the smart grid interacts with different types of consumers. As the "smart" power grid moves...

359

Evaluation of Microscopic Disease in Oral Tongue Cancer Using Whole-Mount Histopathologic Techniques: Implications for the Management of Head-and-Neck Cancers  

Science Conference Proceedings (OSTI)

Purpose: To map the distribution of microscopic disease (MD) in head-and-neck cancer by analyzing digital images of whole-mounted serial sections of tongue cancer specimens. Methods and Materials: Ten T1-3 oral tongue cancer specimens were evaluated. The specimens were sliced into 3-mm blocks from which one or more 4-{mu}m slides were taken and digitized to create whole-mounted serial sections. Gross tumor and microscopic disease were digitally contoured on each slide. Lines perpendicular to the gross tumor volume (GTV) edge were created at 0.05-mm intervals and the distance between GTV and MD measured. Results: Of 88 slides assessed, 44 (50%) had evidence of MD. Of the 63,809 perpendicular lines drawn along the GTV edges, 2320 (3.6%) encountered microscopic disease along their path. The majority of MD abutted the GTV, and only 26.7% was noncontiguous with the GTV edge. The maximum distance from the border was 7.8 mm. Ninety-nine percent of all MD was within 4.75 mm and 95% was within 3.95 mm of the GTV. Conclusion: In this study we were able to assess the distribution of MD more accurately than has been possible with routine pathologic techniques. The results indicate that when the GTV is correctly identified, there is very little MD to be found outside this volume. This has implications for the volume of tissue resected at surgery and the volume included in the clinical target volume in conformal radiotherapy planning.

Campbell, Sorcha [Department of Radiation Oncology, Odette Cancer Centre, University of Toronto, Toronto, ON (Canada); Poon, Ian, E-mail: Ian.Poon@sunnybrook.ca [Department of Radiation Oncology, Odette Cancer Centre, University of Toronto, Toronto, ON (Canada); Markel, Dan; Vena, Dan [Department of Radiation Oncology, Odette Cancer Centre, University of Toronto, Toronto, ON (Canada); Higgins, Kevin; Enepekides, Dan [Department of Otolaryngology, Sunnybrook Health Sciences Centre, University of Toronto, Toronto, ON (Canada); Rapheal, Simon; Wong, John; Allo, Ghassan; Morgen, Eric [Department of Pathology, Sunnybrook Health Sciences Centre, University of Toronto, Toronto, ON (Canada); Khaoum, Nader; Smith, Ben; Balogh, Judith; MacKenzie, Robert [Department of Radiation Oncology, Odette Cancer Centre, University of Toronto, Toronto, ON (Canada); Davidson, Jean [Department of Otolaryngology, Sunnybrook Health Sciences Centre, University of Toronto, Toronto, ON (Canada); Wang, Dan; Yaffe, Martin [Sunnybrook Research Institute, University of Toronto, Toronto, ON (Canada)

2012-02-01T23:59:59.000Z

360

Labyrinth for an ignition distributor cap and rotor assembly with atmospheric purging action  

SciTech Connect

This patent describes an ignition distributor to work with spark plug electrodes, a rotor electrode, a coil electrode and a shaft for an internal combustion engine with cylinders, the ignition distributor comprising: a bowl shaped housing; a distributor cap comprising: a generally dome shape with a generally hollow interior and with a circular shaped bottom to mate with the bowl shaped housing; spark towers equal in number to the number of cylinders of the internal combustion engine, projecting up from the top of the dome shape and slotted to accept spark plug electrodes and allow them to protrude into the distributor cap interior for communication with the rotor electrode; a vent tower projecting up from the top of the dome shape and provided with a vent port through to the distributor cap interior to allow for the outward flow of the atmosphere inside the distributor cap and bowl shaped housing; a coil tower projecting up from the top of the dome shape and slotted to accept a coil electrode and allow it to protrude into the distributor cap interior for communication with the rotor electrode; an inner labyrinth of annular shape on the interior surface of the dome shape surround the coil electrode and protruding into the hollow interior of the dome shape; and an outer labyrinth of annular shape on the interior surface of the dome shape surrounding the inner labyrinth thereby forming an annular channel.

Kronberger, L.J.

1986-12-23T23:59:59.000Z

Note: This page contains sample records for the topic "microscope n2 purged" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

Experimental Study of Main Gas Ingestion and Purge Gas Egress Flow in Model Gas Turbine Stages.  

E-Print Network (OSTI)

??Efficient performance of gas turbines depends, among several parameters, on the mainstream gas entry temperature. At the same time, transport of this high temperature gas… (more)

Balasubramanian, Jagdish Harihara

2010-01-01T23:59:59.000Z

362

Engine cooling system air venting arrangement with buoyant air purge valve  

Science Conference Proceedings (OSTI)

An air vent arrangement is described for the cooling system of an automotive type engine having a radiator with a coolant inlet. The engine has coolant passages communicating with the radiator through an outlet essentially horizontally disposed, tubing connecting the radiator inlet and coolant outlet, and a thermostat in the outlet horizontally movable to open and closed positions. A horizontally disposed air bleed bypass passage is located vertically above the thermostat connecting the coolant outlet to a portion of the tubing downstream of the thermostat bypassing the same when the thermostat is in a closed position for bleeding air from the cooling system. The bypass passage has a valve therein moveable between a position blocking flow of coolant through the same and a second position opening the passage permitting the bleed of air therethrough. The valve is buoyant and constructed and arranged to pivot from a non flowblocking air bleed position into a flow blocking position in response to flow of coolant into the bypass passage acting thereagainst.

Schnizlein, M.E.

1987-02-17T23:59:59.000Z

363

Following weeks of purging and organiz-ing, phase one of the School's reloca-  

E-Print Network (OSTI)

in August. The depart- ments of Consumer Science and Human Development and Family Studies, as well as UW from top: Gloria McCord, Human Ecology financial specialist, casts a spell at the punch-bowl cauldron

Sheridan, Jennifer

364

MORPHEUS: motif oriented representations to purge hostile events from unlabeled sequences  

Science Conference Proceedings (OSTI)

Most of the prevalent anomaly detection systems use some training data to build models. These models are then utilized to capture any deviations resulting from possible intrusions. The efficacy of such systems is highly dependent upon a training data ... Keywords: anomaly detection, data cleaning, motifs

Gaurav Tandon; Philip Chan; Debasis Mitra

2004-10-01T23:59:59.000Z

365

Note: Direct measurement of the point-to-point resolution for microns-thick specimens in the ultrahigh-voltage electron microscope  

SciTech Connect

We report on a direct measurement method and results of the point-to-point resolution for microns-thick amorphous specimens in the ultrahigh-voltage electron microscope (ultra-HVEM). We first obtain the ultra-HVEM images of nanometer gold particles with different sizes on the top surfaces of the thick epoxy-resin specimens. Based on the Rayleigh criterion, the point-to-point resolution is then determined as the minimum distance between centers of two resolvable tangent gold particles. Some values of resolution are accordingly acquired for the specimens with different thicknesses at the accelerating voltage of 2 MV, for example, 18.5 nm and 28.4 nm for the 5 {mu}m and 8 {mu}m thick epoxy-resin specimens, respectively. The presented method and results provide a reliable and useful approach to quantifying and comparing the achievable spatial resolution for the thick specimens imaged in the mode of transmission electron including the scanning transmission electron microscope.

Wang Fang; Cao Meng; Zhang Haibo [Key Laboratory for Physical Electronics and Devices of the Ministry of Education, Department of Electronic Science and Technology, Xi'an Jiaotong University, Xi'an 710049 (China); Nishi, Ryuji; Takaoka, Akio [Research Center for Ultrahigh-Voltage Electron Microscopy, Osaka University, 7-1 Mihogaoka, Ibaraki, Osaka 567-0047 (Japan)

2011-06-15T23:59:59.000Z

366

Non-destructive observation of in-grown stacking faults in 4H-SiC epitaxial layer using mirror electron microscope  

SciTech Connect

Mirror electron microscope (MEM) observation has been conducted for a 4-{mu}m-thick n-doped 4H-SiC epitaxial layer. If the sample is simultaneously illuminated with ultraviolet (UV) light of a slightly greater energy than the bandgap energy of 4H-SiC, in-grown stacking faults (IGSFs) can be clearly observed in MEM images. These observations were performed non-destructively, as almost all irradiated electrons returned without impinging the sample surface due to the negative voltage applied to the sample. High spatial resolution observation via MEM showed that multiple IGSFs were stacked up. The phenomenon in which the contrast of the IGSFs vanished in the absence of UV illumination and under UV illumination with a lower energy than the bandgap energy revealed that the origin of the contrast was the negative charging of IGSFs trapping electrons excited by UV light.

Hasegawa, Masaki; Ohno, Toshiyuki [Central Research Laboratory, Hitachi Ltd., 1-280, Higashi-koigakubo, Kokubunji, Tokyo 185-8601 (Japan)

2011-10-01T23:59:59.000Z

367

Laser direct synthesis of graphene on quartz Dapeng Wei a  

E-Print Network (OSTI)

chamber. Before growing graphene, the chamber was pumped and purged by high-purity N2 gas, and maintained for the growth of graphene [16,32]. When the laser power is high enough, the photoresist is decomposed-area synthesis of high-quality and uniform graphene films on copper foils. Science 2009;324:1312­4. 600 650 700

Xu, Xianfan

368

Ultrafast supercontinuum fiber-laser based pump-probe scanning MOKE microscope for the investigation of electron spin dynamics in semiconductors at cryogenic temperatures with picosecond time and micrometer spatial resolution  

E-Print Network (OSTI)

We describe a two-color pump-probe scanning magneto-optical Kerr effect (MOKE) microscope which we have developed to investigate electron spin phenomena in semiconductors at cryogenic temperatures with picosecond time and micrometer spatial resolution. The key innovation of our microscope is the usage of an ultrafast `white light' supercontinuum fiber-laser source which provides access to the whole visible and near-infrared spectral range. Our Kerr microscope allows for the independent selection of the excitation and detection energy while avoiding the necessity to synchronize the pulse trains of two separate picosecond laser systems. The ability to independently tune the pump and probe wavelength enables the investigation of the influence of excitation energy on the optically induced electron spin dynamics in semiconductors. We demonstrate picosecond real-space imaging of the diffusive expansion of optically excited electron spin packets in a (110) GaAs quantum well sample to illustrate the capabilities of t...

Henn, T; Ossau, W; Molenkamp, L W; Biermann, K; Santos, P V

2013-01-01T23:59:59.000Z

369

Microscopic evidence for a partially gapped density wave state in {alpha}-(BEDT-TTF){sub 2}KHg(SCN){sub 4} in high magnetic fields.  

Science Conference Proceedings (OSTI)

We present NMR measurements on {alpha}-(BEDt-TTF){sub 2}KHg(SCN){sub 4}, in which the six inner carbon sites of BEDT-TTF are labeled with the {sup 13}C isotope, at low temperatures and in magnetic fields up to 28.8 T. We find, based on microscopic measurements which probe the center of the primary molecular orbital, that the density wave ground state of this system persists up to fields well above the so-called 'kink field', a hysteretic transition observed in transport near 23 T below 6 K. The main implication of this result is that in the low temperature limit, the ground state of this material is not fully metallic, but still partially gapped, even to 28.8 T. We obtain a BCS-like relationship between the transition temperature and the energy gap, as derived from the spin relaxation measurements using a simple model. Further, the {sup 13}C NMR spectrum is relatively insensitive to crossing the phase boundary, a result that does not support the notion that the ground state is a conventional spin density wave ground state.

Kuhns, P. L.; Brooks, J. S.; Caldwell, T.; Moulton, W. G.; Reyes, A. P.; Biskup, N.; Kini, A. M.; Schlueter, J. A.; Wang, H. H.; Geiser, U.; Williams, J. M.; Florida State Univ.

1999-02-01T23:59:59.000Z

370

Nanosecond in situ transmission electron microscope studies of the reversible Ge{sub 2}Sb{sub 2}Te{sub 5} crystalline <==> amorphous phase transformation  

SciTech Connect

Chalcogenide-based phase-change materials have wide use in optical recording media and are growing in importance for use in non-volatile electronic memory. For both applications, rapid switching between the amorphous and crystalline phases is necessary, and understanding the changes during rapidly driven phase transitions is of scientific and technological significance. Laser-induced crystallization and amorphization occur rapidly and changes in atomic structure, microstructure, and temperature are difficult to observe experimentally and determine computationally. We have used nanosecond-scale time-resolved diffraction with intense electron pulses to study Ge{sub 2}Sb{sub 2}Te{sub 5} during laser crystallization. Using a unique and unconventional specimen geometry, cycling between the amorphous and crystalline phases was achieved, enabling in situ transmission electron microscope (TEM) study of both microstructural and crystallographic changes caused by repeated switching. Finite element analysis was used to simulate interactions of the laser with the nano-structured specimens and to model the rapidly changing specimen temperature. Such time-resolved experimental methods combined with simulation of experimentally inaccessible physical characteristics will be fundamental to advancing the understanding of rapidly driven phase transformations.

Santala, M. K.; Reed, B. W.; LaGrange, T.; Campbell, G. H.; Browning, N. D. [Condensed Matter and Materials Division, Lawrence Livermore National Laboratory, Livermore, California 94551 (United States); Topuria, T. [IBM Research Division, Almaden Research Center, San Jose, California 95120 (United States); Raoux, S. [IBM T. J. Watson Research Center, Yorktown Heights, New York 10598 (United States); Meister, S. [Intel Corporation, Hillsboro, Oregon 97124 (United States); Cui, Y. [Department of Materials Science and Engineering, Stanford University, Stanford, California 94305 (United States)

2012-01-15T23:59:59.000Z

371

Correlation between resistance-change effect in transition-metal oxides and secondary-electron contrast of scanning electron microscope images  

Science Conference Proceedings (OSTI)

Conductive atomic-force microscopy (C-AFM) writing is attracting attention as a technique for clarifying the switching mechanism of resistive random-access memory by providing a wide area filled with filaments, which can be regarded as one filament with large radius. The writing area on a nickel-oxide (NiO) film formed by conductive atomic-force microscopy was observed by scanning electron microscope, and a correlation between the contrast in a secondary-electron image (SEI) and the resistance written by C-AFM was revealed. In addition, the dependence of the SEI contrast on the beam accelerating voltage (V{sub accel}) suggests that the resistance-change effect occurs near the surface of the NiO film. As for the effects of electron irradiation and vacuum annealing on the C-AFM writing area, it was shown that the resistance-change effect is caused by exchange of oxygen with the atmosphere at the surface of the NiO film. This result suggests that the low-resistance and high-resistance areas are, respectively, p-type Ni{sub 1+{delta}}O ({delta} =} 0).

Kinoshita, K.; Kishida, S. [Department of Information and Electronics, Graduate School of Engineering, Tottori University, 4-101 Koyama-Minami, Tottori 680-8552 (Japan); Tottori University Electronic Display Research Center, 522-2 Koyama-Kita, Tottori 680-0941 (Japan); Yoda, T. [Department of Information and Electronics, Graduate School of Engineering, Tottori University, 4-101 Koyama-Minami, Tottori 680-8552 (Japan)

2011-09-15T23:59:59.000Z

372

Effect of residual chips on the material removal process of the bulk metallic glass studied by in situ scratch testing inside the scanning electron microscope  

Science Conference Proceedings (OSTI)

Research on material removal mechanism is meaningful for precision and ultra-precision manufacturing. In this paper, a novel scratch device was proposed by integrating the parasitic motion principle linear actuator. The device has a compact structure and it can be installed on the stage of the scanning electron microscope (SEM) to carry out in situ scratch testing. Effect of residual chips on the material removal process of the bulk metallic glass (BMG) was studied by in situ scratch testing inside the SEM. The whole removal process of the BMG during the scratch was captured in real time. Formation and growth of lamellar chips on the rake face of the Cube-Corner indenter were observed dynamically. Experimental results indicate that when lots of chips are accumulated on the rake face of the indenter and obstruct forward flow of materials, materials will flow laterally and downward to find new location and direction for formation of new chips. Due to similar material removal processes, in situ scratch testing is potential to be a powerful research tool for studying material removal mechanism of single point diamond turning, single grit grinding, mechanical polishing and grating fabrication.

Huang Hu; Zhao Hongwei; Shi Chengli; Wu Boda; Fan Zunqiang; Wan Shunguang; Geng Chunyang [College of Mechanical Science and Engineering, Jilin University, Renmin Street 5988, Changchun, Jilin 130025 (China)

2012-12-15T23:59:59.000Z

373

Microscopic Description of Induced Fission  

E-Print Network (OSTI)

Selected aspects of the description of neutron-induced fission in 240Pu in the framework of the nuclear energy density functional theory at finite temperature are presented. In particular, we discuss aspects pertaining to the choice of thermodynamic state variables, the evolution of fission barriers as function of the incident neutron energy, and the temperatures of the fission fragments.

N. Schunck

2013-02-22T23:59:59.000Z

374

Simulating scanning tunneling microscope measurements  

E-Print Network (OSTI)

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

Venkatachalam, Vivek

2006-01-01T23:59:59.000Z

375

The microscopic theory of fission  

E-Print Network (OSTI)

Fission-fragment properties have been calculated for thermal neutron-induced fission on a $^{239}\\textrm{Pu}$ target, using constrained Hartree-Fock-Bogoliubov calculations with a finite-range effective interaction. A quantitative criterion based on the interaction energy between the nascent fragments is introduced to define the scission configurations. The validity of this criterion is benchmarked against experimental measurements of the kinetic energies and of multiplicities of neutrons emitted by the fragments.

W. Younes; D. Gogny

2009-10-09T23:59:59.000Z

376

A Networked Scanning Electron Microscope  

Science Conference Proceedings (OSTI)

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

377

Microscopic Models for Chemical Thermodynamics  

E-Print Network (OSTI)

We introduce an infinite particle system dynamics, which includes stochastic chemical kinetics models, the classical Kac model and free space movement. We study energy redistribution between two energy types (kinetic and chemical) in different time scales, similar to energy redistribution in the living cell. One example is considered in great detail, where the model provides main formulas of chemical thermodynamics.

Malyshev, V A

2011-01-01T23:59:59.000Z

378

Microscopic Models for Chemical Thermodynamics  

E-Print Network (OSTI)

We introduce an infinite particle system dynamics, which includes stochastic chemical kinetics models, the classical Kac model and free space movement. We study energy redistribution between two energy types (kinetic and chemical) in different time scales, similar to energy redistribution in the living cell. One example is considered in great detail, where the model provides main formulas of chemical thermodynamics.

V. A. Malyshev

2011-12-08T23:59:59.000Z

379

Heating Graphene in a Microscope  

Science Conference Proceedings (OSTI)

About this Abstract. Meeting, 2010 TMS Annual Meeting & Exhibition. Symposium , The Vasek Vitek Honorary Symposium on Crystal Defects, Computational ...

380

A multilayer grating with a novel layer structure for a flat-field spectrograph attached to transmission electron microscopes in energy region of 2-4 keV  

SciTech Connect

A multilayer mirror with a novel layer structure to uniformly enhance the reflectivity in a few keV energy range at a fixed angle of incidence is invented and applied to a multilayer grating for use in a flat-field spectrograph attached to a conventional electron microscope. The diffraction efficiency of the fabricated multilayer grating having the new layer structure is evaluated at the angle of incidence of 88.65 deg. in the energy region of 2.1-4.0 keV. It is shown that the multilayer grating is effective to uniformly enhance the diffraction efficiency and able to be practically used in this energy region.

Imazono, T.; Koike, M.; Koeda, M.; Nagano, T.; Sasai, H.; Oue, Y.; Yonezawa, Z.; Kuramoto, S.; Terauchi, M.; Takahashi, H.; Handa, N.; Murano, T. [QuBS, Japan Atomic Energy Agency (JAEA), 8-1-7 Umemidai, Kizugawa, Kyoto 619-0215 (Japan); Device Dept., Shimadzu Corp., 1 Nishinokyo-Kuwabarcho, Nakagyo-ku, Kyoto 604-8511 (Japan); IMRAM, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577 (Japan); EC Business Unit, JEOL Ltd., 3-1-2 Musashino, Akishima, Tokyo 196-8558 (Japan)

2012-05-17T23:59:59.000Z

Note: This page contains sample records for the topic "microscope n2 purged" 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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381

6 magazine a u t u m n 2 0 1 1 a u t u m n 2 0 1 1 magazine 7  

E-Print Network (OSTI)

: Solazyme, Incorporated, "Development of Pilot Production Plants for Soladiesel RD Utilizing) Renewable Diesel Solazyme, Inc. In Progress Non-Attainment (All) Source: Energy Commission staff analysis as a high percentage of sensitive populations. #12;2 Project Name Solazyme, Incorporated

Duong, Timothy Q.

382

TransForum v9n2 - Energy Frontier Research Centers  

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

Energy Frontier Research Centers Promise Advances in Transportation Technologies Energy Frontier Research Centers Promise Advances in Transportation Technologies IACT The solid-electrolyte interface is a critical component in electrochemical energy storage. Because of the high reactivity between the electrolyte and the electrodes at the SEI interface, Li-ion batteries show limited calendar and cycle life--less than two years, which is much lower than the 15 years required for enabling this technology in vehicles. CEES The platinum particle is interacting with a molecule of propanol. The propanol is a gas phase surrogate for the heavier cellulose materials that are the focus of one of Argonne's Energy Frontier Research Centers, the Institute for Atom-Efficient Chemical Transformations. The U.S. Department of Energy's (DOE's) Office of Science recently

383

TransForum v7n2 - Catalyst Breakthrough Boosts Hydrogen Fuel...  

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

vacuum system used in their electrocatalysis work. Our nation's dependence on foreign sources for transportation fuels threatens our economic and national security but how...

384

Ray optical light trapping in silicon microwires: exceeding the 2n2  

E-Print Network (OSTI)

. Shen, T. Mallouk, E. Dickey, T. Mayer, and J. Redwing, "Radial junction silicon wire array solar cells

Heaton, Thomas H.

385

TransForum v7n2 - Argonne-developed Cerium-Oxide Catalyst Helps...  

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

Argonne-developed Cerium-Oxide Catalyst Helps Eliminate NOx from Diesel Exhaust equipment used to test the Cu-ZSM-5 catalyst Argonne post-doctoral associate Sundar Krishnan (left),...

386

TransForum v8n2 - DeNOX Catalyst License  

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

Integrated Fuel Technologies Gets Worldwide License for Argonne-developed Diesel DeNOX Catalyst Argonne chemist Chris Marshall (front) displays a container of the catalyst while...

387

TransForum v9n2 - Air Force Fellows and Smarter Diesel Engines  

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

Air Force Fellows Help Work Toward Smarter Diesel Engines Air force fellows Major Clint Abell (center), Steve McConnell, Lt. Col. Jeff Gillen, Thomas Wallner and Steve Ciatti (in...

388

COLLOQUE DE PHYSIQUE Colloque C2, supplement au n2. Tome 51, Fevrier 1990  

E-Print Network (OSTI)

and brine with p~ = Swpw+ Sopo and K;,' = S,K; + SoK; (where p,, po, Kw and K,, are water and oil densities

Paris-Sud XI, Université de

389

Structural and magnetic properties of MBE grown GeMnN2 thin films  

Science Conference Proceedings (OSTI)

Epitaxial GeMnN{sub 2} thin films are synthesized by plasma-assisted molecular beam epitaxy. Transmission electron microscopy and x-ray diffraction measurements confirm that it is the orthorhombic variant, consistent with the predictions of first-principles calculations. The magnetic properties of the films are related to defects, with samples grown under Ge-rich conditions exhibiting a net magnetic moment above room temperature. These results are explained by first-principles calculations, indicating that the preferential substitution of one magnetic sublattice of GeMnN{sub 2} by impurities and/or intrinsic defects such as Ge antisites produces a net magnetic moment in an antiferromagnetic background, and also introduces spin-polarized carriers near the Fermi level.

Liu, Y [University of Wisconsin, Milwaukee; Lazarov, V. K. [University of Wisconsin, Milwaukee; Cheung, S.H. [University of Wisconsin, Milwaukee; Keavney, D.J. [Argonne National Laboratory (ANL); Gai, Zheng [ORNL; Gajdardziska-Josifovska, M [University of Wisconsin, Milwaukee; Weinert, M [University of Wisconsin, Milwaukee; Li, Lian [University of Wisconsin, Milwaukee

2012-01-01T23:59:59.000Z

390

TransForum v7n2 - Nanoexa, Decktron Collaborating with Argonne...  

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

Department of Energy's (DOE's) Argonne National Laboratory. plug-in hybrid electric vehicle Next-generation rechargeable lithium batteries with increased power output, storage...

391

$1/N^2$ correction to free energy in hermitian two-matrix model  

E-Print Network (OSTI)

Using the loop equations we find an explicit expression for genus 1 correction in hermitian two-matrix model in terms of holomorphic objects associated to spectral curve arising in large N limit. Our result generalises known expression for $F^1$ in hermitian one-matrix model. We discuss the relationship between $F^1$, Bergmann tau-function on Hurwitz spaces, G-function of Frobenius manifolds and determinant of Laplacian over spectral curve.

B. Eynard; A. Kokotov; D. Korotkin

2004-01-23T23:59:59.000Z

392

800,000 Year Ice-Core Records of Atmospheric Nitrous Oxide (N2O...  

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

create a long-term record to the present. These records are maintained by the World Data Center for Paleoclimatology, National Oceanic and Atmospheric Administration (NOAA), and...

393

Infrared Spectra of C3H3 +-N2 Dimers: Identification of  

E-Print Network (OSTI)

T. Hanna & Mendi Stauffer Hanna Teresa L. Hanna & Christopher D. Hanna Carol Carpenter Hannon & W. Scott

Maier, John Paul

394

Benzyl-Functionalized Room Temperature Ionic Liquids for CO2/N2 Separation  

Science Conference Proceedings (OSTI)

In this work, three classes of room temperature ionic liquids (RTILs), including imidazolium, pyridinium, and pyrrolidinium ionic liquids with a benzyl group appended to the cation, were synthesized and tested for their performance in separating CO{sub 2} and N{sub 2}. All RTILs contained the bis(trifluoromethylsulfonyl)imide anion, permitting us to distinguish the impact of the benzyl moiety attached to the cation on gas separation performance. In general, the attachment of the benzyl group increased the viscosity of the ionic liquid compared with the unfunctionalized analogs and decreased the CO{sub 2} permeability. However, all of the benzyl-modified ionic liquids exhibited enhanced CO{sub 2}/N{sub 2} selectivities compared with alkyl-based ionic liquids, with values ranging from 22.0 to 33.1. In addition, CO{sub 2} solubilities in the form of Henry's constants were also measured and compared with unfunctionalized analogs. Results of the membrane performance tests and CO{sub 2} solubility measurements demonstrate that the benzyl-functionalized RTILs have significant potential for use in the separation of carbon dioxide from combustion products.

Mahurin, Shannon Mark [ORNL; Dai, Thomas N [ORNL; Yeary, Joshua S [ORNL; Luo, Huimin [ORNL; Dai, Sheng [ORNL

2011-01-01T23:59:59.000Z

395

TransForum v5n2 - Argonne's "Composite-Structure" Electrodes...  

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

primarily for leveling the load on the internal combustion engine (ICE) and for capturing energy associated with regenerative braking. If fuel prices continue to rise, automakers...

396

TransForum v8n2 - Drive Cycle Impact on PHEVs  

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

studied the impact of drive cycles on the component requirements of plug-in hybrid electric vehicles (PHEVs). Results showed that vehicles designed to satisy the urban...

397

Multistep N2 Breathing in the Metal-Organic Framework Co(1,4-benzenedipyrazolate)  

E-Print Network (OSTI)

and in harmony with recent numerical simulations [20]. There is a surprise, however. Numerical [6., Thermochim. Acta, 238 (1994) 277. See also Modu- lated DSC, document TA210, T.A. Instruments, Inc., New

398

TransForum v8n2 - U.S.-Sweden Joint PHEV Research  

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

PHEV Research The Argonne Smart Charge System Looking to jointly develop new plug-in hybrid vehicle (PHEV) technology and accelerate its consumer acceptance and...

399

TransForum v3n2 - Ethanol Additive for Diesel  

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

ETHANOL FUEL ADDITIVE MAY HELP SOLVE THE DIESEL EMISSIONS PUZZLE The quest to reduce atmospheric emissions associated with diesel-fueled vehicles has faced a longstanding...

400

TransForum v9n2 - TTRDC Equipped with X-ray Vision  

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

Alan Kastengren examines a diesel injection nozzle used in Argonne's X-ray fuel spray research. Engineers at Argonne's Transportation Technology Research and Development...

Note: This page contains sample records for the topic "microscope n2 purged" 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

N2: Fabrication of Uranium Dispersion Targets for Mo-99 Production  

Science Conference Proceedings (OSTI)

Uranium metal powder was fabricated by a centrifugal atomization technique. Uranium content of the dispersion targets was controlled to be 3, 6 and 9 g-U/ cm2 ...

402

Adaptive posicast controller for time-delay systems with relative degree n*?2  

Science Conference Proceedings (OSTI)

In this paper, we present an Adaptive Posicast Controller that deals with parametric uncertainties in linear systems with delays. It is assumed that the plant has no right half plane zeros and the delay is known. The adaptive controller is based on the ... Keywords: Adaptive control, Model matching, Time-delay systems

Yildiray Yildiz; Anuradha Annaswamy; Ilya V. Kolmanovsky; Diana Yanakiev

2010-02-01T23:59:59.000Z

403

TransForum v5n2 - DOE Officials Visit Argonne's Transportation...  

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

supports the cell on a rugged, inexpensive metal, rather than a brittle, expensive ceramic, and incorporates sealing of the fuel chamber into the single-cell fabrication...

404

TransForum v9n2 -Transportation at Argonne Open House  

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

Technologies Shine at Argonne's Open House jehlikgroupopenhouse Researcher Forrest Jehlik shows open house visitors how to use Argonne's driving simulator. aroraopenhousegrou...

405

TransForum v8n2 - EnerDel/Argonne Battery  

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

Contact TTRDC TransForum Vol. 8, No. 2 R&D 100 Award: EnerDelArgonne High-Power Battery for Hybrid Electric Vehicles The EnerDelArgonne Lithium-Ion Battery Khalil Amine, a...

406

TransForum v9n2 - Lithium-ion Battery Research  

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

Working With Argonne Contact TTRDC TransForum Vol. 9, No. 2 Argonne's Lithium-ion Battery Research Produces New Materials and Technology Transfer Successes li-ionbattery...

407

TransForum v5n2 - Argonne Expert Addresses Energy and Environmental...  

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

- virtually all of it produced from corn - the energy and environmental effects of using corn-based ethanol have nonetheless been questioned. A few researchers maintain that...

408

TransForum v8n2 - GREET 1.8b  

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

hydrogenation, Coalbiomass co-feeding for Fitscher-Tropsch diesel production, Various corn ethanol plant types with different process fuels, and Pet coke to hydrogen...

409

A Calcium Coordination Framework Having Permanent Porosity and High CO2/N2 Selectivity  

SciTech Connect

A thermally stable, microporous calcium coordination network shows a reversible 5.75 wt % CO{sub 2} uptake at 273 K and 1 atm pressure, with an enthalpy of interaction of {approx}31 kJ/mol and a CO{sub 2}/N{sub 2} selectivity over 45 under ideal flue gas conditions. The absence of open metal sites in the activated material suggests a different mechanism for selectivity and high interaction energy compared to those for frameworks with open metal sites.

Banerjee D.; Parise J.; Zhang, Z.; Plonka, A.M.; Li, J.

2012-03-15T23:59:59.000Z

410

Measurements of isotope effects in the photoionization of N2 and implications for Titan's atmosphere  

E-Print Network (OSTI)

= 1.00±0.02. Using the solar spectrum shown in Figure 2c forFor comparison, the solar spectrum from Woods et al. (1998)

Croteau, Philip

2011-01-01T23:59:59.000Z

411

An O(n^2) Algorithm for Lot Sizing with Inventory Bounds and Fixed ...  

E-Print Network (OSTI)

Jun 26, 2007 ... Abstract: Lot-sizing problems with inventory bounds and fixed charges have not received much attention in the literature, even though there are ...

412

TransForum v8n2 - Advanced Lithium Battery Conference  

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

lithium batteries for transportation applications, organizers from the U.S., Japan and Korea jointly initiated the conference. Among available battery technologies, lithium-ion...

413

TransForum v7n2 - A New Nanolubrication Technology May Solve...  

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

all of these problems can actually be blamed on low-sulfur diesel is debatable, but a lubricant additive that could economically solve them without causing separation or other...

414

N=2 and N=4 supergravities as compactifications from string theories in 10 dimensions  

E-Print Network (OSTI)

We first review standard results of the compactification of type IIA and IIB supergravities on a Calabi-Yau threefold and illustrate mirror symmetry. Then we compactify the same theories on a class of generalized Calabi-Yau manifolds called Half-flat. We obtain the scalar potential, and we show that type IIA on a Half-flat manifold is mirror symmetric to type IIB on a Calabi-Yau threefold with electric NS-fluxes turned on. In the last part, we compute the full equations of motion for N=4 supergravity in central charge superspace with the graviphotons identified as central charge components of the vielbein. We show the equivalence with the formulation in components.

Sebastien Gurrieri

2004-08-05T23:59:59.000Z

415

TransForum v5n2 -University of Waterloo Students Win First-Year...  

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

in Auburn Hills, Michigan. General Motors (GM), the U.S. Department of Energy (DOE), and Argonne sponsored the event, which challenged 17 universities from across North...

416

Transported PDF Modeling of Nonpremixed Turbulent CO/H-2/N-2 Jet Flames  

Science Conference Proceedings (OSTI)

Turbulent CO/H{sub 2}/N{sub 2} (“syngas”) flames are simulated using a transported composition probability density function (PDF) method. A consistent hybrid Lagrangian particle/Eulerian mesh algorithm is used to solve the modeled PDF transport equation. The model includes standard k–? turbulence, gradient transport for scalars, and Euclidean minimum spanning tree (EMST) mixing. Sensitivities of model results to variations in the turbulence model, the treatment of radiation heat transfer, the choice of chemical mechanism, and the PDF mixing model are explored. A baseline model reproduces the measured mean and rms temperature, major species, and minor species profiles reasonably well, and captures the scaling that is observed in the experiments. Both our results and the literature suggest that further improvements can be realized with adjustments in the turbulence model, the radiation heat transfer model, and the chemical mechanism. Although radiation effects are relatively small in these flames, consideration of radiation is important for accurate NO prediction. Chemical mechanisms that have been developed specifically for fuels with high concentrations of CO and H{sub 2} perform better than a methane mechanism that was not designed for this purpose. It is important to account explicitly for turbulence–chemistry interactions, although the details of the mixing model do not make a large difference in the results, within reasonable limits.

Zhao, xinyu; Haworth, D. C.; Huckaby, E. David

2012-01-01T23:59:59.000Z

417

TransForum v7n2 - New Version of PSAT Released  

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

Program. PSAT is available on the Software Shop web site at http:www.anl.govtechtransferSoftwareShopPSATNPPSATNP.html. August 27, 2007 Related Items Contact Aymeric...

418

Abstract Anaerobic ammonium oxidation with nitrite to N2 (anammox) is a recently discovered microbial reaction  

E-Print Network (OSTI)

evaporator Membrane evaporation is a membrane contactor process through which an aqueous solution may contactor, by providing a contact with an air stream, which collects the evaporating water through membrane concentration was found to predict the TRS reduction with high accuracy. Ultra-centrifuge was used to separate

Alvarez, Pedro J.

419

Nuclear quantum effects in the structure and lineshapes of the N2 NEXAFS spectrum  

SciTech Connect

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

Fatehi, Shervin; Schwartz, Craig P.; Saykally, Richard J.; Prendergast, David

2009-12-04T23:59:59.000Z

420

Effect of high-energy electron irradiation in an electron microscope column on fluorides of alkaline earth elements (CaF{sub 2}, SrF{sub 2}, and BaF{sub 2})  

SciTech Connect

The effect of high-energy (150 eV) electron irradiation in an electron microscope column on crystals of fluorides of alkaline earth elements CaF{sub 2}, SrF{sub 2}, and BaF{sub 2} is studied. During structural investigations by electron diffraction and electron microscopy, the electron irradiation causes chemical changes in MF{sub 2} crystals such as the desorption of fluorine and the accumulation of oxygen in the irradiated area with the formation of oxide MO. The fluorine desorption rate increases significantly when the electron-beam density exceeds the threshold value of {approx}2 Multiplication-Sign 10{sup 3} pA/cm{sup 2}). In BaF{sub 2} samples, the transformation of BaO into Ba(OH){sub 2} was observed when irradiation stopped. The renewal of irradiation is accompanied by the inverse transformation of Ba(OH){sub 2} into BaO. In the initial stage of irradiation of all MF{sub 2} compounds, the oxide phase is in the single-crystal state with a lattice highly matched with the MF{sub 2} matrix. When the irradiation dose is increased, the oxide phase passes to the polycrystalline phase. Gaseous products of MF{sub 2} destruction (in the form of bubbles several nanometers in diameter) form a rectangular array with a period of {approx}20 nm in the sample.

Nikolaichik, V. I. [Russian Academy of Sciences, Institute of Microelectronics Technology and High Purity Materials (Russian Federation); Sobolev, B. P., E-mail: sobolev@ns.crys.ras.ru; Zaporozhets, M. A.; Avilov, A. S. [Russian Academy of Sciences, Shubnikov Institute of Crystallography (Russian Federation)

2012-03-15T23:59:59.000Z

Note: This page contains sample records for the topic "microscope n2 purged" 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

Entanglement enhances performance in microscopic quantum fridges  

E-Print Network (OSTI)

Understanding the thermodynamics of quantum systems is of fundamental importance, from both theoretical and experimental perspectives. A growing interest has been recently given to small self-contained quantum thermal machines, the functioning of which requires no external source of work or control, but only incoherent interactions with thermal baths. The simplicity of such machines makes them and ideal test-bed for exploring quantum thermodynamics. So far, however, the importance of quantum effects in these machines has remained elusive. Here we show that entanglement, the paradigmatical quantum effect, plays a fundamental role in small self-contained quantum refrigerators, as it can enhance cooling and energy transport -- except notably when the efficiency is close to the Carnot limit. Hence a truly quantum refrigerator can outperform a classical one. Furthermore, the amount of entanglement alone quantifies the enhancement in cooling. More generally, our work shows that entanglement opens new possibilities in thermodynamics.

Nicolas Brunner; Marcus Huber; Noah Linden; Sandu Popescu; Ralph Silva; Paul Skrzypczyk

2013-05-26T23:59:59.000Z

422

Investigating Microscopic Heat Transport with Neutron Scattering  

Science Conference Proceedings (OSTI)

In-Situ Neutron Diffraction and Crystal Plasticity Modeling of a-Uranium · In-Situ Studies of the ... Thermal Residual Stresses and Strains in Depleted Uranium.

423

New NIST Microscope Measures Nanomagnet Property Vital ...  

Science Conference Proceedings (OSTI)

... Animation of spin waves excited by a transient magnetic field pulse in a nanomagnet, as simulated with NIST micromagnetics software (Object ...

2013-03-20T23:59:59.000Z

424

Scanning Tunneling Microscopic Characterization of Electron ...  

Science Conference Proceedings (OSTI)

... (7.15nS) for dDT and two order of magnitude larger (0.078nS) than hDT. ... Formation of Silver Nanocube Array via Silica-Polymer Nanocomposites ... of Cu- Nb Multilayers as a Function of Dislocation/Disconnection Content ... Synthesis of W–25 Wt%Cu Composite Powders Using Ammonium Para Tungstate and Copper ...

425

Basic Design of the Scanning Electron Microscope  

Science Conference Proceedings (OSTI)

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

426

Disorder-Induced Microscopic Magnetic Memory  

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

for refrigerator doors-they are of paramount importance in today's digital information age. In the face of a rapidly growing appetite for data storage, shrinking the size of...

427

Atom Manipulation with the Scanning Tunneling Microscope  

Science Conference Proceedings (OSTI)

... nanostructure from an unknown random collection of atoms without human intervention. ... a set of extensible rules, and allows for error correction. ...

2013-04-26T23:59:59.000Z

428

Generalized drift-diffusion for microscopic thermoelectricity  

E-Print Network (OSTI)

Although thermoelectric elements increasingly incorporate nano-scale features in similar material systems as other micro-electronic devices, the former are described in the language of irreversible thermodynamics while ...

Santhanam, Parthiban

2009-01-01T23:59:59.000Z

429

Technology Commercialization and Partnerships | New Microscope ...  

... the atomic structure of a material. At present, the VPPEM has successfully imaged uncoated silk, magnetic steel wool, gold mesh, and micron-sized tungsten wires. ...

430

High resolution x-ray microscope  

Science Conference Proceedings (OSTI)

The authors present x-ray images of grid meshes and biological material obtained using a microspot x-ray tube with a multilayer optic and a 92-element parabolic compound refractive lens (CRL) made of a plastic containing only hydrogen and carbon. Images obtained using this apparatus are compared with those using an area source with a spherical lens and a spherical lens with multilayer condenser. The authors found the best image quality using the multilayer condenser with a parabolic lens, compared to images with a spherical lens and without the multilayer optics. The resolution was measured using a 155-element parabolic CRL and a multilayer condenser with the microspot tube. The experiment demonstrates about 1.1 {mu}m resolution.

Gary, C. K.; Park, H.; Lombardo, L. W.; Piestrup, M. A.; Cremer, J. T.; Pantell, R. H.; Dudchik, Y. I. [Adelphi Technology, Inc. 981-B Industrial Road, San Carlos, California 94070 (United States); Department of Electrical Engineering, Stanford University, Stanford, California 94305 (United States); Institute of Applied Physics Problems, Kurchatova 7, Minsk 220064 (Belarus)

2007-04-30T23:59:59.000Z

431

Microscopic Characterization of CPVC Failure Modes  

Science Conference Proceedings (OSTI)

In this study, cracks were generated in sections of CPVC pipe to typify hydrostatic burst, ... Examination of Inadvertent Diffusion Bonding During Heat Treatment.

432

Surface and Microscopic Characterization of Manufactured ...  

Science Conference Proceedings (OSTI)

Advances in Characterization of Graphene-related Nanomaterials Using Atomic ... Current state of atomic force microscopy (AFM) imaging of graphene and its ...

433

Near-Field Magneto-Optical Microscope  

DOE Patents (OSTI)

A device and method for mapping magnetic fields of a sample at a resolution less than the wavelength of light without altering the magnetic field of the sample is disclosed. A device having a tapered end portion with a magneto-optically active particle positioned at the distal end thereof in communication with a fiber optic for transferring incoming linearly polarized light from a source thereof to the particle and for transferring reflected light from the particle is provided. The fiber optic has a reflective material trapping light within the fiber optic and in communication with a light detector for determining the polarization of light reflected from the particle as a function of the strength and direction of the magnetic field of the sample. Linearly polarized light from the source thereof transferred to the particle positioned proximate the sample is affected by the magnetic field of the sample sensed by the particle such that the difference in polarization of light entering and leaving the particle is due to the magnetic field of the sample. Relative movement between the particle and sample enables mapping.

Vlasko-Vlasov, Vitalii; Welp, Ulrich; and Crabtree, George W.

2005-12-06T23:59:59.000Z

434

Canonical suppression in microscopic transport models  

E-Print Network (OSTI)

We demonstrate the occurrence of canonical suppression associated with the conservation of an U(1)-charge in current transport models. For this study a pion gas is simulated within two different transport approaches by incorporating inelastic and volume-limited collisions $\\pi\\pi\\leftrightarrow K\\bar{K}$ for the production of kaon pairs. Both descriptions can dynamically account for the suppression in the yields of rare strange particles in a limited box, being in full accordance with a canonical statistical description.

O. Fochler; S. Vogel; M. Bleicher; C. Greiner; P. Koch-Steinheimer; Z. Xu

2006-01-20T23:59:59.000Z

435

Influence of Heat Treatment in /cap beta/ and $gamma$ Phases on the Microscopic Structure of Uranium; INFLUENCE DES TRAITEMENTS THERMIQUES EN PHASES /cap beta/ ET $gamma$ SUR LA STRUCTURE MICROGRAPHIQUE DE L'URANIUM  

DOE Green Energy (OSTI)

A new method of microscopic examination of uranium is described. Electrolytic polishing and etching are carried out in an acetic acid-chromic acid bath. Atmospheric or anodic oxidation of the polished surface produces films which follow exactly changes in the structure of the underlying metal. This method is very sensitive to small variations of orientation in polygonized crystals. Using this method of examination of uranium, it was found that annealing U in the {gamma} phase followed by a cooling at a rate dependent of the annealing temperature, causes the formation of substructures different from those due to the polygonization of {alpha}-U. The substructures are indicated by the concentration of impurities on the dislocations induced by the stresses accompanying the allotropic transformation {gamma} {yields} {beta}. Similar treatment of the U-1.4% Cr alloy in which the {beta} phase is stabilized at room temperature, confirms this explanation. In addition to the polygonization substructures, sharp discontinuities can be observed in the network of sub- boundaries as a fine white edging. The comparison of these with the structure revealed by thermal etching in vacuum suggest that there are traces of the grain boundaries of the {gamma} phase. The method of etching followed by oxidation shows a haloed phase identified as UH{sub 3}. The conditions of appearance and disappearance of this phase are studied. The sensitivity of this method of detecting the last traces of H in U is very high. The dependence of the hydrogen content on the tensile properties of uranium metal was also studied. (author)

Robillard, A.

1959-07-01T23:59:59.000Z

436

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

Science Conference Proceedings (OSTI)

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

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

2012-03-15T23:59:59.000Z

437

The contrastive research in the photocatalytic activity of BiOBr synthesized by different reactants  

Science Conference Proceedings (OSTI)

BiOBr nanoplates, marked as ?-BiOBr and ?-BiOBr, were synthesized via hydrothermal method using cetylpyridinium bromide (CPB) and NaBr as reactants, respectively. X-Ray Diffraction (XRD), transmission electron microscope (TEM), N2 ...

Wang Ling-Li; Ma Wan-Hong; Wang Shu-Lian; Zhang Yu; Jia Man-Ke; Li Rui-Ping; Zhang Ai-Qing; Huang Ying-Ping

2012-01-01T23:59:59.000Z

438

Low Thermal Conductivity of RE4Si2O7N2 (RE=Y, Lu): A Systematic ...  

Science Conference Proceedings (OSTI)

The present work shows that identifying new low thermal conductivity ceramics can be realized by a combination approach of first-principles calculation and ...

439

Formation and Genotoxicity of Novel Oxidatively Generated Tandem DNA Lesions and N2-(1-carboxyethyl)-2'-deoxyguanosine  

E-Print Network (OSTI)

free and error-prone lesion bypass by human DNA polymerase ?free and error-prone lesion bypass by human DNA polymerase kfree and error-prone lesion bypass by human DNA polymerase

Jiang, Yong

2009-01-01T23:59:59.000Z

440

A U T U M N 2 0 1 2www.ucd.ie/ucdtoday 5.UCDstudents  

E-Print Network (OSTI)

and the Marine; and Mr Lee Zhenghong, General Manager, Dairy United #12;9 | Autumn 2012 Feature The Higgs boson the theory was one major advance, but what about finding evidence for it? A Higgs boson would be a relatively into mass," explains Dr McNulty. "Sometimes a Higgs boson is produced and this decays instantaneously

Note: This page contains sample records for the topic "microscope n2 purged" 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

Journal of Low Power Electronics, Vol. 6, N 2, August 2010 A Markovian Decision-based Approach for Extending  

E-Print Network (OSTI)

state is x and action ax is chosen , xa x x Transition rate of the power-managed system from state x, where an entry represents the transition rate from one state to another; an action set; and a reward frequency of 206MHz. The CP in the host was Orinoco WLAN PC card. The power consumption and state transition

Pedram, Massoud

442

The European land and inland water CO2, CO, CH4 and N2O balance between 2001 and 2005  

SciTech Connect

Globally, terrestrial ecosystems have absorbed about 30% of anthropogenic greenhouse gas emissions over the period 2000-2007 and inter-hemispheric gradients indicate that a significant fraction of terrestrial carbon sequestration must be north of the Equator. We present a compilation of the CO{sub 2}, CO, CH{sub 4} and N{sub 2}O balances of Europe following a dual constraint approach in which (1) a land-based balance derived mainly from ecosystem carbon inventories and (2) a land-based balance derived from flux measurements are compared to (3) the atmospheric data-based balance derived from inversions constrained by measurements of atmospheric GHG (greenhouse gas) concentrations. Good agreement between the GHG balances based on fluxes (1294 {+-} 545 Tg C in CO{sub 2}-eq yr{sup -1}), inventories (1299 {+-} 200 Tg C in CO{sub 2}-eq yr{sup -1}) and inversions (1210 {+-} 405 Tg C in CO{sub 2}-eq yr{sup -1}) increases our confidence that the processes underlying the European GHG budget are well understood and reasonably sampled. However, the uncertainty remains large and largely lacks formal estimates. Given that European net land to atmosphere exchanges are determined by a few dominant fluxes, the uncertainty of these key components needs to be formally estimated before efforts could be made to reduce the overall uncertainty. The net land-to-atmosphere flux is a net source for CO{sub 2}, CO, CH{sub 4} and N{sub 2}O, because the anthropogenic emissions by far exceed the biogenic sink strength. The dual-constraint approach confirmed that the European biogenic sink removes as much as 205 {+-} 72 Tg C yr{sup -1} from fossil fuel burning from the atmosphere. However, This C is being sequestered in both terrestrial and inland aquatic ecosystems. If the C-cost for ecosystem management is taken into account, the net uptake of ecosystems is estimated to decrease by 45% but still indicates substantial C-sequestration. However, when the balance is extended from CO{sub 2} towards the main GHGs, C-uptake by terrestrial and aquatic ecosystems is offset by emissions of non-CO{sub 2} GHGs. As such, the European ecosystems are unlikely to contribute to mitigating the effects of climate change.

Luyassaert, S [CEA-CNRS-UVSQ, LSCE; Abril, G [Laboratoire EPOC, CNRS; Andres, Robert Joseph [ORNL; Bastviken, D [Linkoping University; Bellassen, V [CEA-CNRS-UVSQ, LSCE; Bergamaschi, P [European Commission Joint Research Centre; Bousquet, P [CEA-CNRS-UVSQ, LSCE; Chevallier, F [CEA-CNRS-UVSQ, LSCE; Ciais, P. [LSCE/CEA, Gif-sur-Yvette, France; Corazza, M [European Commission Joint Research Centre; Dechow, R [Johann Heinrich von Thünen Institute; Erb, K-H [Alpen-Adria Universitaet Klagenfurt-Vienna-Graz; Etiope, G [Istituto Nazionale di Geofisica e Vulcanologia; Fortems-Cheiney, A [CEA-CNRS-UVSQ, LSCE; Grassi, G [European Commission Joint Research Centre; Hartmann, J [University of Hamburg; Jung, M. [Max Planck Institute for Biogeochemistry; Lathiere, J [CEA-CNRS-UVSQ, LSCE; Lohila, A [Finnish Meteorological institute; Mayorga, E [University of Washington; Moosdorf, N [University of Hamburg; Njakou, D [University of Antwerp; Otto, J [CEA-CNRS-UVSQ, LSCE; Papale, D. [University of Tuscia; Peters, W [Wageningen University and Research Centre, The Netherlands; Peylin, P [CEA-CNRS-UVSQ, LSCE; Raymond, Peter A [Yale School of Forestry and Environmental Studies; Rodenbeck, C [Max Planck Institute for Biogeochemistry; Saarnio, S [University of Eastern Finland; Schulze, E.-D. [Max Planck Institute for Biogeochemistry; Szopa, S [CEA-CNRS-UVSQ, LSCE; Thompson, R [CEA-CNRS-UVSQ, LSCE; Verkerk, P [European Forest Institute; Vuichard, N [CEA-CNRS-UVSQ, LSCE; Wang, R [Peking University; Wattenbach, M [Helmholtz Centre Potsdam GFZ German Research Centre For Geosciences; Zaehle, S [Max Planck Institute for Biogeochemistry

2012-01-01T23:59:59.000Z

443

Subtask 1.22 - Microbial Cycling of CH4, CO2, and N2O in a Wetlands Environment  

Science Conference Proceedings (OSTI)

Soil microbial metabolic activities play an important role in determining CO{sub 2}, CH{sub 4}, and N{sub 2}O fluxes from terrestrial ecosystems. To verify and evaluate CO{sub 2} sequestration potential by wetland restoration in the Prairie Pothole Region (PPR), as well as to address concern over restoration effects on CH{sub 4} and N{sub 2}O emissions, laboratory and in situ microcosm studies on microbial cycling of CO{sub 2}, CH{sub 4}, and N{sub 2}O were initiated. In addition, to evaluate the feasibility of the use of remote sensing to detect soil gas flux from wetlands, a remote-sensing investigation was also conducted. Results of the laboratory microcosm study unequivocally proved that restoration of PPR wetlands does sequester atmospheric CO{sub 2}. Under the experimental conditions, the simulated restored wetlands did not promote neither N{sub 2}O nor CH{sub 4} fluxes. Application of ammonia enhanced both N{sub 2}O and CH{sub 4} emission, indicating that restoration of PPR wetlands may reduce both N{sub 2}O and CH{sub 4} emission by cutting N-fertilizer input. Enhancement of CO{sub 2} emission by the N-fertilizer was observed, and this observation revealed an overlooked fact that application of N-fertilizer may potentially increase CO{sub 2} emission. In addition, the CO{sub 2} results also demonstrate that wetland restoration sequesters atmospheric carbon not only by turning soil conditions from aerobic to anoxic, but also by cutting N-fertilizer input that may enhance CO{sub 2} flux. The investigation on microbial community structure and population dynamics showed that under the experimental conditions restoration of the PPR wetlands would not dramatically increase population sizes of those microorganisms that produce N{sub 2}O and CH{sub 4}. Results of the in situ study proved that restoration of the PPR wetland significantly reduced CO{sub 2} flux. Ammonia enhanced the greenhouse gas emission and linearly correlated to the CO{sub 2} flux within the experimental rate range (46-200 kg N ha{sup -1}). The results also clarified that the overall reduction in global warming potential (GWP) by the PPR wetland restoration was mainly contributed from reduction in CO{sub 2} flux. These results demonstrate that restoration of currently farmed PPR wetlands will significantly reduce the overall GWP budget. Remote sensing investigations indicate that while the 15-meter resolution of the imagery was sufficient to delineate multiple zones in larger wetlands, it was not sufficient for correlation with the ground-based gas flux measurement data, which were collected primarily for smaller wetland sites (<250 meters) in the areas evaluated by this task. To better evaluate the feasibility of using satellite imagery to quantify wetland gas flux, either higher-resolution satellite imagery or gas flux data from larger wetland sites is needed.

Dingyi Ye; Bethany Kurz; Marc Kurz

2008-12-31T23:59:59.000Z

444

Monte Carlo modeling of the dc saddle field plasma: Discharge characteristics of N2 and SiH4  

E-Print Network (OSTI)

properties.1 More recently there have been suggestions that disilane radicals derived from Si2H6, which

Kherani, Nazir P.

445

The N2K Consortium. II. A Transiting Hot Saturn Around HD 149026 With a Large Dense Core  

E-Print Network (OSTI)

Doppler measurements from Subaru and Keck have revealed radial velocity variations in the V=8.15, G0IV star HD 149026 consistent with a Saturn-Mass planet in a 2.8766 day orbit. Photometric observations at Fairborn Observatory have detected three complete transit events with depths of 0.003 mag at the predicted times of conjunction. HD 149026 is now the second brightest star with a transiting extrasolar planet. The mass of the star, based on interpolation of stellar evolutionary models, is 1.3 +/- 0.1 solar masses; together with the Doppler amplitude, K=43.3 m s^-1, we derive a planet mass Msin(i)=0.36 Mjup, and orbital radius of 0.042 AU. HD 149026 is chromospherically inactive and metal-rich with spectroscopically derived [Fe/H]=+0.36, Teff=6147 K, log g=4.26 and vsin(i)=6.0 km s^-1. Based on Teff and the stellar luminosity of 2.72 Lsun, we derive a stellar radius of 1.45 Rsun. Modeling of the three photometric transits provides an orbital inclination of 85.3 +/- 1.0 degrees and (including the uncertainty in the stellar radius) a planet radius of 0.725 +/- 0.05 Rjup. Models for this planet mass and radius suggest the presence of a ~67 Mearth core composed of elements heavier than hydrogen and helium. This substantial planet core would be difficult to construct by gravitational instability.

B. Sato; D. A. Fischer; G. W. Henry; G. Laughlin; R. P. Butler; G. W. Marcy; S. S. Vogt; P. Bodenheimer; S. Ida; E. Toyota; A. Wolf; J. A. Valenti; L. J. Boyd; J. A. Johnson; J. T. Wright; M. Ammons; S. Robinson; J. Strader; C. McCarthy; K. L. Tah; D. Minniti

2005-06-30T23:59:59.000Z

446

Density-functional study of organicinorganic hybrid single crystal ZnSe,,C2H8N2...12  

E-Print Network (OSTI)

and Chemical Biology, Rutgers University, Piscataway, New Jersey 08854 Received 19 September 2003; accepted 13 January 2004 Unusual properties i.e., strong band dispersion, high carrier mobility, wide absorption their performances. However, organic materials generally suffer1,3 low electron/hole mobility which is caused

Li, Jing

447

Critical Effect of the N2 Amino Group on Structure, Dynamics, and Elasticity of DNA Polypurine Tracts  

E-Print Network (OSTI)

Chemistry, University of Utah, Salt Lake City, Utah 84112-5820 USA; Division Biophysics of Macromolecules. INTRODUCTION Sequence-dependent local conformational variability of DNA was first evidenced at the atomic. Despite intense research, the atomic-resolution picture of the A-tract-induced curvature remains elusive

Langowski, Jörg

448

Hydrogeology, chemical and microbial activity measurement through deep permafrost  

E-Print Network (OSTI)

Ethene % Ethane % Propene % Propane % Butene % iso-Butane %Butane C1/(C2 + C3) HLW-03-28, Purge 4 ND HLW-03-28, Purge 6

Stotler, R.L.

2010-01-01T23:59:59.000Z

449

NCEM National Center for Electron Microscopy: Microscopes and Facilities:  

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

SPLEEM SPLEEM Publications Imaging Spin Reorientation Transitions in Consecutive Atomic Co layers, Farid El Gabaly, Silvia Gallego, M. Carmen Munoz, Laszlo Szunyogh, Peter Weinberger, Kevin F. McCarty, Christof Klein, Andreas K. Schmid, Juan de la Figuera, submitted Direct imaging of spin-reorientation transitions in ultra-thin Ni films by spin-polarized low-energy electron microscopy, C. Klein, A. K. Schmid, R. Ramchal, and M. Farle, submitted Controlling the kinetic order of spin-reorientation transitions in Ni/Cu(100) films by tuning the substrate step-structure, C. Klein, R. Ramchal, A.K. Schmid, M. Farle, submitted Self-organization and magnetic domain microstructure of Fe nanowire arrays, N. Rougemaille and A.K. Schmid, submitted Self-Assembled Nanofold Network Formation on Layered Crystal Surfaces

450

NCEM National Center for Electron Microscopy: Microscopes and Facilities:  

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

CM 200 FEG CM 200 FEG AEME The Philips CM200/FEG is a versatile instrument that is designed for analysis of the physical, chemical and magnetic microstructure at high spatial resolution. In addition to high resolution imaging capability, the machine is optimized for analytical electron microscopy and Lorentz imaging, under normal as well as dynamic conditions of variable temperature (77K - 1250K) and applied magnetic fields. Spatially resolved compositional analysis by X-ray emission spectroscopy (Z > 5), local electronic structure measurements by electron energy-loss spectroscopy (Z > 2), convergent beam electron diffraction for three-dimensional structure information, and energy-filtered imaging at the nanometer scale are some of the techniques available on this instrument. In addition, a TEM differential phase

451

Microscopic Dynamics in Non-Simple Liquid Metals  

Science Conference Proceedings (OSTI)

Our recent inelastic X-ray scattering (IXS) experiments on several non-simple liquid metals have revealed characteristic common features in the collective dynamics. 1) Clear indications for propagating phonon modes were found as in simple liquid metals as liquid alkalis. 2) They exhibit a positive dispersion of about 20 % (except in liquid Ge) again as in liquid simple metals. 3) A very short time (sub-picosecond) retaining of the nearest-neighbor correlation is visualized by a Gaussian component in the quasielastic line shape, which may be related to short living covalent species. In this paper, we review the IXS experiment on liquid Si as a typical non-simple liquid metal, and discuss its dynamic properties in connection with results of an ab initio molecular dynamics simulation.

Hosokawa, S.; Pilgrim, W.-C. [Institut fuer Physikalische-, Kern-, und Makromolekulare Chemie, Philipps Universitaet Marburg, D-35032 Marburg (Germany)

2004-04-30T23:59:59.000Z

452

Microscopic description of complex nuclear decay: multimodal fission  

E-Print Network (OSTI)

Our understanding of nuclear fission, a fundamental nuclear decay, is still incomplete due to the complexity of the process. In this paper, we describe a study of spontaneous fission using the symmetry-unrestricted nuclear density functional theory. Our results show that the observed bimodal fission can be explained in terms of pathways in multidimensional collective space corresponding to different geometries of fission products. We also predict a new phenomenon of trimodal spontaneous fission for some rutherfordium, seaborgium, and hassium isotopes.

A. Staszczak; A. Baran; J. Dobaczewski; W. Nazarewicz

2009-06-23T23:59:59.000Z

453

X-Ray diffraction analysis and transmission electron microscopic ...  

Science Conference Proceedings (OSTI)

eral in women with osteoporosis. Calcif Tissue Res 21:452-. 456. 6. Dahllof G, Lindskog S, Theorell K, Ussisoo R (1987) Con- comitant regional odontodysplasia ...

454

Original article Microscopic detection of adulteration of honey  

E-Print Network (OSTI)

Inspection Service, Hoogte Kadijk 401, 1018 BK Amsterdam, The Netherlands; 2 Beekeeping Training- terations of honey can easily be detected (Codex, 1989; White, 1979). #12;However, in many developing

Recanati, Catherine

455

Evaluating EUV mask pattern imaging with two EUV microscopes  

E-Print Network (OSTI)

This work was supported by the Director, Office of Science,Office of Basic Energy Sciences, of the U.S. Department of

Goldberg, Kenneth A.

2008-01-01T23:59:59.000Z

456

Mechanisms of Nickel Sorption on Pyrophyllite: Macroscopic and Microscopic Approaches  

E-Print Network (OSTI)

and illite, shows little deviation from the ideal chemi- cal formula [Al2Si4Oio(OH)2] of 2:1 clay minerals

Sparks, Donald L.

457

Radiation microscope for SEE testing using GeV ions.  

SciTech Connect

Radiation Effects Microscopy is an extremely useful technique in failure analysis of electronic parts used in radiation environment. It also provides much needed support for development of radiation hard components used in spacecraft and nuclear weapons. As the IC manufacturing technology progresses, more and more overlayers are used; therefore, the sensitive region of the part is getting farther and farther from the surface. The thickness of these overlayers is so large today that the traditional microbeams, which are used for REM are unable to reach the sensitive regions. As a result, higher ion beam energies have to be used (> GeV), which are available only at cyclotrons. Since it is extremely complicated to focus these GeV ion beams, a new method has to be developed to perform REM at cyclotrons. We developed a new technique, Ion Photon Emission Microscopy, where instead of focusing the ion beam we use secondary photons emitted from a fluorescence layer on top of the devices being tested to determine the position of the ion hit. By recording this position information in coincidence with an SEE signal we will be able to indentify radiation sensitive regions of modern electronic parts, which will increase the efficiency of radiation hard circuits.

Doyle, Barney Lee; Knapp, James Arthur; Rossi, Paolo; Hattar, Khalid M.; Vizkelethy, Gyorgy; Brice, David Kenneth; Branson, Janelle V.

2009-09-01T23:59:59.000Z

458

Microscopic Surface Mapping of the Thermal Diffusivity by ...  

Science Conference Proceedings (OSTI)

A modulated pump laser heats the sample and a perfectly coaxial probe laser measures the surface ... Rietveld Refinement of an Oil Field Cement Blend.

459

Microscopic analysis of irradiated AGR-1 coated particle fuel compacts  

SciTech Connect

The AGR-1 experiment involved irradiation of 72 TRISO-coated particle fuel compacts to a peak burnup of 19.5% FIMA with no in-pile failures observed out of 3×105 total particles. Irradiated AGR-1 fuel compacts have been cross-sectioned and analyzed with optical microscopy to characterize kernel, buffer, and coating behavior. Five compacts have been examined so far, spanning a range of irradiation conditions (burnup, fast fluence, and irradiation temperature) and including all four TRISO coating variations irradiated in the AGR-1 experiment. The cylindrical specimens were sectioned both transversely and longitudinally, then polished to expose between approximately 40-80 individual particles on each mount. The analysis focused primarily on kernel swelling and porosity, buffer densification and fracturing, buffer-IPyC debonding, and fractures in the IPyC and SiC layers. Characteristic morphologies have been identified, over 800 particles have been classified, and spatial distributions of particle types have been mapped. No significant spatial patterns were discovered in these cross sections. However, some trends were found between morphological types and certain behavioral aspects. Buffer fractures were found in approximately 23% of the particles, and these fractures often resulted in unconstrained kernel swelling into the open cavities. Fractured buffers and buffers that stayed bonded to IPyC layers appear related to larger pore size in kernels. Buffer-IPyC interface integrity evidently factored into initiation of rare IPyC fractures. Fractures through part of the SiC layer were found in only three particles, all in conjunction with IPyC-SiC debonding. Compiled results suggest that the deliberate coating fabrication variations influenced the frequencies of IPyC fractures, IPyC-SiC debonds, and SiC fractures.

Scott Ploger; Paul Demkowicz; John Hunn; Robert Morris

2012-10-01T23:59:59.000Z

460

Microscopic eigenvalue correlations in QCD with imaginary isospin chemical potential  

E-Print Network (OSTI)

We consider the chiral limit of QCD subjected to an imaginary isospin chemical potential. In the epsilon-regime of the theory we can perform precise analytical calculations based on the zero-momentum Goldstone modes in the low-energy effective theory. We present results for the spectral correlation functions of the associated Dirac operators.

P. H. Damgaard; U. M. Heller; K. Splittorff; B. Svetitsky; D. Toublan

2006-04-07T23:59:59.000Z

Note: This page contains sample records for the topic "microscope n2 purged" 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

Microscopic diagonal entropy and its connection to basic thermodynamic relations  

SciTech Connect

We define a diagonal entropy (d-entropy) for an arbitrary Hamiltonian system as S{sub d}=-{Sigma}{sub n{rho}nn}ln{rho}{sub nn} with the sum taken over the basis of instantaneous energy states. In equilibrium this entropy coincides with the conventional von Neumann entropy S{sub n} = -Tr{rho} ln {rho}. However, in contrast to S{sub n}, the d-entropy is not conserved in time in closed Hamiltonian systems. If the system is initially in stationary state then in accord with the second law of thermodynamics the d-entropy can only increase or stay the same. We also show that the d-entropy can be expressed through the energy distribution function and thus it is measurable, at least in principle. Under very generic assumptions of the locality of the Hamiltonian and non-integrability the d-entropy becomes a unique function of the average energy in large systems and automatically satisfies the fundamental thermodynamic relation. This relation reduces to the first law of thermodynamics for quasi-static processes. The d-entropy is also automatically conserved for adiabatic processes. We illustrate our results with explicit examples and show that S{sub d} behaves consistently with expectations from thermodynamics.

Polkovnikov, Anatoli, E-mail: asp@bu.edu [Department of Physics, Boston University, Boston, MA 02215 (United States)

2011-02-15T23:59:59.000Z

462

COMBINED FLUORESCENT AND GOLD PROBES FOR MICROSCOPIC AND MORPHOLOGICAL INVESTIGATIONS.  

SciTech Connect

Nanogold{reg_sign}, a gold cluster with a core of gold atoms 1.4 nm in diameter, has proven to be a superior probe label for electron microscopy (EM), giving both higher labeling density and improved access to previously hindered or restricted antigens. It may be visualized by autometallography (AMG) for use in light microscopy (LM): silver-and gold-amplified Nanogold detection has proven to be one of the most sensitive methods available for the detection of low copy number targets such as viral DNA in cells and tissue specimens. AMG enhancement has also made Nanogold an effective detection label in blots and gels. The following protocols will be described: Labeling of nuclear components in cells. Protocol for in situ hybridization and detection with fluorescein-Nanogold--or Cy3{trademark}-Nanogold-labeled streptavidin. Nanogold is an inert molecule, and generally does not interact with biological molecules unless a specific chemical reactivity is introduced into the molecule. Conjugates are prepared using site-specific chemical conjugation through reactive chemical functionalities introduced during Nanogold preparation, which allows the gold label to be attached to a specific site on the conjugate biomolecule. For example, a maleimido-Nanogold derivative, which is specific for thiol binding, is frequently attached to the hinge region of an antibody at a unique thiol site generated by selective reduction of a hinge disulfide. This site is remote from the antigen combining region, and the Nanogold, therefore, does not compromise target binding. Nanogold may also be prepared with specific reactivity towards amines or other unique chemical groups. This mode of attachment enables the preparation of probes labeled with both Nanogold and fluorescent labels. Different chemical reactivities are used to attach the Nanogold and the fluorescent groups to different sites in the conjugate biomolecule, as shown in Figure 7.1. In this manner, the two labels are spaced sufficiently far apart that fluorescent resonance energy transfer does not quench the fluorescent signal, and the probes may be used to label specimens for fluorescent and EM observation in a single staining procedure. This reduces the complexity of the staining procedure, allowing less specimen perturbation, and also enables a higher degree of correlation between the fluorescence and EM localization of the target, thus increasing the usefulness of the complementary data sets. Since gold and fluorescent-labeled probes are often used at different concentrations under different conditions, optimum procedures for the use of fluorescent and gold probes may entail some degree of compromise between the most appropriate conditions for the two types of probes. However, the chemical stability of the Nanogold label means that it is generally stable to a wide range of use conditions, and the following protocols have been found to be effective for labeling specimens with combined fluorescein and Nanogold-labeled antibody Fab' probes and with combined Cy3 and Nanogold-labeled streptavidin.

POWELL,R.D.HAINFELD,J.F.

2002-04-17T23:59:59.000Z

463

Neutron and X-ray Scattering Investigations of Microscopic Energy ...  

Science Conference Proceedings (OSTI)

A Case Study in Future Energy Challenges: Towards In Situ Hard X-ray Microscopy of ... of Crystal Structure and Domain Character in Lead Free Piezoceramics.

464

Near-Field Scanning Microwave Microscope: Big at the ...  

Science Conference Proceedings (OSTI)

... resolution for such a wide range of samples, including semiconductors, semiconducting nanowire, materials for photovoltaic applications, magnetic ...

2012-11-08T23:59:59.000Z

465

Microscopic Study of Slags from a Secondary Lead Blast Furnace  

Science Conference Proceedings (OSTI)

Novel Forming Techniques in Fabrication of Powder-based Metals via Current Activated Tip-Based Sintering (CATS) · Particle Size Distribution of Natural ...

466

Microscopic derivation of IBM and structural evolution in nuclei  

SciTech Connect

A Hamiltonian of the interacting boson model (IBM) is derived based on the mean-field calculations with nuclear energy density functionals (EDFs). The multi-nucleon dynamics of the surface deformation is simulated in terms of the boson degrees of freedom. The interaction strengths of the IBM Hamiltonian are determined by mapping the potential energy surfaces (PESs) of a given EDF with quadrupole degrees of freedom onto the corresponding PES of IBM. A fermion-to-boson mapping for a rotational nucleus is discussed in terms of the rotational response, which reflects a specific time-dependent feature. Ground-state correlation energy is evaluated as a signature of structural evolution. Some examples resulting from the present spectroscopic calculations are shown for neutron-rich Pt, Os and W isotopes including exotic ones.

Nomura, Kosuke [Department of Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033 (Japan)

2011-05-06T23:59:59.000Z

467

Microscopic entropy of nondilatonic branes: A 2D approach  

SciTech Connect

We investigate nondilatonic p-branes in the near-extremal, near-horizon regime. A two-dimensional gravity model, obtained from dimensional reduction, gives an effective description of the brane. We show that the AdS{sub p+2}/CFT{sub p+1} correspondence at finite temperature admits an effective description in terms of a AdS{sub 2}/CFT{sub 1} duality endowed with a scalar field, which breaks the conformal symmetry and generates a nonvanishing central charge. The entropy of the CFT{sub 1} is computed using Cardy formula. Fixing in a natural way a free, dimensionless, parameter introduced in the model by a renormalization procedure, we find exact agreement between the CFT{sub 1} entropy and the Bekenstein-Hawking entropy of the brane.

Cadoni, Mariano; Serra, Nicola [Dipartimento di Fisica, Universita di Cagliari, and INFN sezione di Cagliari, Cittadella Universitaria 09042 Monserrato (Italy)

2004-12-15T23:59:59.000Z

468

Atomic Force Microscope 2: Digital Instruments/Veeco ...  

Science Conference Proceedings (OSTI)

... Tapping mode; Contact mode; Phase mode; Magnetic force microscopy; Scanning tunneling microscopy; Stepper-motor controlled stage; Top view ...

2013-12-11T23:59:59.000Z

469

Strong evidence of surface tension reduction in microscopic aqueous droplets  

E-Print Network (OSTI)

, doi:10.1029/2007JD008590. Li, Z., A. Williams, and M. Rood (1998), Influence of soluble surfactant Those in Figure 2) Compositiona n Ddry (m) RH (%) fSOA ktot korg kCCN SOA 20 0.350­0.650 99.60­99.84 1 0 s is that of pure water (72 mJ m�2 ). If, instead, we assume s is reduced by a factor of $2, the calculated k

Goldstein, Allen

470

NCEM National Center for Electron Microscopy: Microscopes and...  

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

TEM and STEM. In addition, the incorporation of a monochromator into the gun permits electron energy loss spectroscopy to be performed with an energy resolution of 0.15eV. This...

471

NCEM National Center for Electron Microscopy: Microscopes and...  

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

The system contains both a focused Ga+ ion beam and a field emission scanning electron column. The ion column can be used for selective removal of material by ion beam...

472

Microscopic theory of multiple scattering for open shell nuclei  

SciTech Connect

The scattering of a distinguishable projectile from a nucleus is considered assuming that the underlying interaction Hamiltonian is a sum of two-body potentials. The effective interaction of the projectile with the nucleus in a truncated nuclear model space can be calculated as a linked cluster expansion. The shell-model interaction is required to be an energy-independent, hermitian potential; its expression is terms of the underlying two-body potential is given by folded diagrams. The terms in the expansion of the effective projectile-nucleus interaction must also contain folded diagrams but, unlike the shell-model potential, these are energy dependent in order to describe the singularities associated with the crossing of the scattering thresholds as the projectile energy is varied. Once the effective interaction is known, elastic and inelastic scattering may be evaluated numerically by solving a finite-dimensional coupled-channel equation. 24 refs., 12 figs.

Johnson, M.B.; Singham, M.K.

1986-01-01T23:59:59.000Z

473

Zeiss Ultra-60 Field Emission Scanning Electron Microscope ...  

Science Conference Proceedings (OSTI)

... cover panels, particularly those on the electro-optic ... Units in the vacuum display windows can be ... mouse button) in the parameter display window. ...

2013-01-18T23:59:59.000Z

474

CFN | Hitachi HD2700C Scanning Transmission Electron Microscope  

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

compositional and electronic information. Here is an example of EELS-2D mapping on Li-battery electrode materials as how Li and Fe elements distributed at nanometer scale. SEM...

475

Microscopic description of Cf-252 cold fission yields  

E-Print Network (OSTI)

We investigate the cold fission of 252Cf within the two center shell model to compute the potential energy surface. The fission yields are estimated by using the semiclassical penetration approach. It turns out that the inner cold valley of the total potential energy is strongly connected with Z=50 magic number. The agreement with experimental values is very much improved only by considering mass and charge asymmetry degrees of freedom. Thus, indeed cold fission of 252Cf is a Sn-like radioactivity, related the other two "magic radioactivities", namely alpha-decay and heavy-cluster decay, called also Pb-like radioactivity. This calculation provides the necessary theoretical confidence to estimate the penetration cross section in producing superheavy nuclei, by using the inverse fusion process.

Mirea, M; Sandulescu, A

2009-01-01T23:59:59.000Z

476

Microscopic description of Cf-252 cold fission yields  

E-Print Network (OSTI)

We investigate the cold fission of 252Cf within the two center shell model to compute the potential energy surface. The fission yields are estimated by using the semiclassical penetration approach. It turns out that the inner cold valley of the total potential energy is strongly connected with Z=50 magic number. The agreement with experimental values is very much improved only by considering mass and charge asymmetry degrees of freedom. Thus, indeed cold fission of 252Cf is a Sn-like radioactivity, related the other two "magic radioactivities", namely alpha-decay and heavy-cluster decay, called also Pb-like radioactivity. This calculation provides the necessary theoretical confidence to estimate the penetration cross section in producing superheavy nuclei, by using the inverse fusion process.

M. Mirea; D. S. Delion; A. Sandulescu

2009-07-20T23:59:59.000Z

477

Microscopic Black Hole Pairs in Highly-Excited States  

E-Print Network (OSTI)

We consider the quantum mechanics of a system consisting of two identical, Planck-size Schwarzschild black holes revolving around their common center of mass. We find that even in a very highly-excited state such a system has very sharp, discrete energy eigenstates, and the system performs very rapid transitions from a one stationary state to another. For instance, when the system is in the 100th excited state, the life times of the energy eigenstates are of the order of $10^{-30}$ s, and the energies of gravitons released in transitions between nearby states are of the order of $10^{22}$ eV.

J. Makela; P. Repo

2000-06-20T23:59:59.000Z

478