Science.gov

Sample records for administrative matters electronic

  1. 10 CFR 603.600 - Administrative matters.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ... 10 Energy 4 2013-01-01 2013-01-01 false Administrative matters. 603.600 Section 603.600 Energy... Affecting Participants' Financial, Property, and Purchasing Systems § 603.600 Administrative matters. This subpart addresses “systemic” administrative matters that place requirements on the operation of...

  2. 10 CFR 603.600 - Administrative matters.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ... 10 Energy 4 2012-01-01 2012-01-01 false Administrative matters. 603.600 Section 603.600 Energy... Affecting Participants' Financial, Property, and Purchasing Systems § 603.600 Administrative matters. This subpart addresses “systemic” administrative matters that place requirements on the operation of...

  3. 10 CFR 603.600 - Administrative matters.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ... 10 Energy 4 2014-01-01 2014-01-01 false Administrative matters. 603.600 Section 603.600 Energy... Affecting Participants' Financial, Property, and Purchasing Systems § 603.600 Administrative matters. This subpart addresses “systemic” administrative matters that place requirements on the operation of...

  4. 10 CFR 603.600 - Administrative matters.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ... 10 Energy 4 2011-01-01 2011-01-01 false Administrative matters. 603.600 Section 603.600 Energy... Affecting Participants' Financial, Property, and Purchasing Systems § 603.600 Administrative matters. This subpart addresses “systemic” administrative matters that place requirements on the operation of...

  5. 10 CFR 603.600 - Administrative matters.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... 10 Energy 4 2010-01-01 2010-01-01 false Administrative matters. 603.600 Section 603.600 Energy... Affecting Participants' Financial, Property, and Purchasing Systems § 603.600 Administrative matters. This subpart addresses “systemic” administrative matters that place requirements on the operation of...

  6. 48 CFR 1253.204 - Administrative matters.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... 48 Federal Acquisition Regulations System 5 2013-10-01 2013-10-01 false Administrative matters. 1253.204 Section 1253.204 Federal Acquisition Regulations System DEPARTMENT OF TRANSPORTATION CLAUSES AND FORMS FORMS Prescription of Forms 1253.204 Administrative matters. The following forms...

  7. 48 CFR 1253.204 - Administrative matters.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 48 Federal Acquisition Regulations System 5 2010-10-01 2010-10-01 false Administrative matters. 1253.204 Section 1253.204 Federal Acquisition Regulations System DEPARTMENT OF TRANSPORTATION CLAUSES AND FORMS FORMS Prescription of Forms 1253.204 Administrative matters. The following forms...

  8. 48 CFR 53.204 - Administrative matters.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... 48 Federal Acquisition Regulations System 2 2012-10-01 2012-10-01 false Administrative matters. 53.204 Section 53.204 Federal Acquisition Regulations System FEDERAL ACQUISITION REGULATION (CONTINUED) CLAUSES AND FORMS FORMS Prescription of Forms 53.204 Administrative matters....

  9. 48 CFR 1253.204 - Administrative matters.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 48 Federal Acquisition Regulations System 5 2011-10-01 2011-10-01 false Administrative matters. 1253.204 Section 1253.204 Federal Acquisition Regulations System DEPARTMENT OF TRANSPORTATION CLAUSES AND FORMS FORMS Prescription of Forms 1253.204 Administrative matters. The following forms...

  10. 48 CFR 53.204 - Administrative matters.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 48 Federal Acquisition Regulations System 2 2010-10-01 2010-10-01 false Administrative matters. 53.204 Section 53.204 Federal Acquisition Regulations System FEDERAL ACQUISITION REGULATION (CONTINUED) CLAUSES AND FORMS FORMS Prescription of Forms 53.204 Administrative matters....

  11. 48 CFR 53.204 - Administrative matters.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... 48 Federal Acquisition Regulations System 2 2014-10-01 2014-10-01 false Administrative matters. 53.204 Section 53.204 Federal Acquisition Regulations System FEDERAL ACQUISITION REGULATION (CONTINUED) CLAUSES AND FORMS FORMS Prescription of Forms 53.204 Administrative matters....

  12. 48 CFR 53.204 - Administrative matters.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 48 Federal Acquisition Regulations System 2 2011-10-01 2011-10-01 false Administrative matters. 53.204 Section 53.204 Federal Acquisition Regulations System FEDERAL ACQUISITION REGULATION (CONTINUED) CLAUSES AND FORMS FORMS Prescription of Forms 53.204 Administrative matters....

  13. 48 CFR 1253.204 - Administrative matters.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... 48 Federal Acquisition Regulations System 5 2012-10-01 2012-10-01 false Administrative matters. 1253.204 Section 1253.204 Federal Acquisition Regulations System DEPARTMENT OF TRANSPORTATION CLAUSES AND FORMS FORMS Prescription of Forms 1253.204 Administrative matters. The following forms...

  14. 48 CFR 53.204 - Administrative matters.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... 48 Federal Acquisition Regulations System 2 2013-10-01 2013-10-01 false Administrative matters. 53.204 Section 53.204 Federal Acquisition Regulations System FEDERAL ACQUISITION REGULATION (CONTINUED) CLAUSES AND FORMS FORMS Prescription of Forms 53.204 Administrative matters....

  15. 48 CFR 1253.204 - Administrative matters.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... 48 Federal Acquisition Regulations System 5 2014-10-01 2014-10-01 false Administrative matters. 1253.204 Section 1253.204 Federal Acquisition Regulations System DEPARTMENT OF TRANSPORTATION CLAUSES AND FORMS FORMS Prescription of Forms 1253.204 Administrative matters. The following forms...

  16. Electron interaction in matter

    NASA Technical Reports Server (NTRS)

    Dance, W. E.; Rainwater, W. J.; Rester, D. H.

    1969-01-01

    Data on the scattering of 1-MeV electrons in aluminum for the case of non-normal incidence, electron-bremsstrahlung cross-sections in thin targets, and the production of bremstrahlung by electron interaction in thick targets, are presented both in tabular and graphic form. These results may interest physicists and radiologists.

  17. 48 CFR 952.204 - Clauses related to administrative matters.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... administrative matters. 952.204 Section 952.204 Federal Acquisition Regulations System DEPARTMENT OF ENERGY CLAUSES AND FORMS SOLICITATION PROVISIONS AND CONTRACT CLAUSES Text of Provisions and Clauses 952.204 Clauses related to administrative matters....

  18. 48 CFR 952.204 - Clauses related to administrative matters.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... administrative matters. 952.204 Section 952.204 Federal Acquisition Regulations System DEPARTMENT OF ENERGY CLAUSES AND FORMS SOLICITATION PROVISIONS AND CONTRACT CLAUSES Text of Provisions and Clauses 952.204 Clauses related to administrative matters....

  19. 14 CFR 120.111 - Administrative and other matters.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ... 14 Aeronautics and Space 3 2011-01-01 2011-01-01 false Administrative and other matters. 120.111 Section 120.111 Aeronautics and Space FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION... ALCOHOL TESTING PROGRAM Drug Testing Program Requirements § 120.111 Administrative and other matters....

  20. 14 CFR 120.111 - Administrative and other matters.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ... 14 Aeronautics and Space 3 2013-01-01 2013-01-01 false Administrative and other matters. 120.111 Section 120.111 Aeronautics and Space FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION... ALCOHOL TESTING PROGRAM Drug Testing Program Requirements § 120.111 Administrative and other matters....

  1. 14 CFR 120.111 - Administrative and other matters.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ... 14 Aeronautics and Space 3 2012-01-01 2012-01-01 false Administrative and other matters. 120.111 Section 120.111 Aeronautics and Space FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION... ALCOHOL TESTING PROGRAM Drug Testing Program Requirements § 120.111 Administrative and other matters....

  2. 14 CFR 120.111 - Administrative and other matters.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ... 14 Aeronautics and Space 3 2014-01-01 2014-01-01 false Administrative and other matters. 120.111 Section 120.111 Aeronautics and Space FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION... ALCOHOL TESTING PROGRAM Drug Testing Program Requirements § 120.111 Administrative and other matters....

  3. 48 CFR 3053.204-70 - Administrative matters.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 48 Federal Acquisition Regulations System 7 2010-10-01 2010-10-01 false Administrative matters. 3053.204-70 Section 3053.204-70 Federal Acquisition Regulations System DEPARTMENT OF HOMELAND SECURITY... Administrative matters. The following forms are prescribed for use in the closeout of applicable contracts,...

  4. 48 CFR 3053.204-70 - Administrative matters.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 48 Federal Acquisition Regulations System 7 2011-10-01 2011-10-01 false Administrative matters. 3053.204-70 Section 3053.204-70 Federal Acquisition Regulations System DEPARTMENT OF HOMELAND SECURITY... Administrative matters. The following forms are prescribed for use in the closeout of applicable contracts,...

  5. 48 CFR 3053.204-70 - Administrative matters.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... 48 Federal Acquisition Regulations System 7 2012-10-01 2012-10-01 false Administrative matters. 3053.204-70 Section 3053.204-70 Federal Acquisition Regulations System DEPARTMENT OF HOMELAND SECURITY... Administrative matters. The following forms are prescribed for use in the closeout of applicable contracts,...

  6. 48 CFR 3053.204-70 - Administrative matters.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... 48 Federal Acquisition Regulations System 7 2014-10-01 2014-10-01 false Administrative matters. 3053.204-70 Section 3053.204-70 Federal Acquisition Regulations System DEPARTMENT OF HOMELAND SECURITY... Administrative matters. The following forms are prescribed for use in the closeout of applicable contracts,...

  7. 48 CFR 3053.204-70 - Administrative matters.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... 48 Federal Acquisition Regulations System 7 2013-10-01 2012-10-01 true Administrative matters. 3053.204-70 Section 3053.204-70 Federal Acquisition Regulations System DEPARTMENT OF HOMELAND SECURITY... Administrative matters. The following forms are prescribed for use in the closeout of applicable contracts,...

  8. 75 FR 59102 - Defense Federal Acquisition Regulation Supplement; Part 204, Administrative Matters

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-09-27

    ...; Part 204, Administrative Matters AGENCY: Defense Acquisition Regulations System, Department of Defense.... 0 Therefore 48 CFR part 204 is amended as follows: PART 204--ADMINISTRATIVE MATTERS 0 1....

  9. 48 CFR 952.204 - Clauses related to administrative matters.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 48 Federal Acquisition Regulations System 5 2011-10-01 2011-10-01 false Clauses related to administrative matters. 952.204 Section 952.204 Federal Acquisition Regulations System DEPARTMENT OF ENERGY CLAUSES AND FORMS SOLICITATION PROVISIONS AND CONTRACT CLAUSES Text of Provisions and Clauses...

  10. 48 CFR 952.204 - Clauses related to administrative matters.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... 48 Federal Acquisition Regulations System 5 2013-10-01 2013-10-01 false Clauses related to administrative matters. 952.204 Section 952.204 Federal Acquisition Regulations System DEPARTMENT OF ENERGY CLAUSES AND FORMS SOLICITATION PROVISIONS AND CONTRACT CLAUSES Text of Provisions and Clauses...

  11. 48 CFR 952.204 - Clauses related to administrative matters.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... 48 Federal Acquisition Regulations System 5 2012-10-01 2012-10-01 false Clauses related to administrative matters. 952.204 Section 952.204 Federal Acquisition Regulations System DEPARTMENT OF ENERGY CLAUSES AND FORMS SOLICITATION PROVISIONS AND CONTRACT CLAUSES Text of Provisions and Clauses...

  12. The passage of fast electrons through matter

    NASA Astrophysics Data System (ADS)

    Sorini, Adam P.

    This work regards the passage of fast electrons through matter, and in particular how electrons scatter and lose energy within a solid. The basic quantum theory of these scattering processes was first considered in the early- to mid-20th century by Bohr, Bethe, Fermi, and others. This work extends our understanding of how a relativistic electron scatters off, and loses energy to, a complex many-body system. The main idea of this work is that it is now possible to calculate, from first-principles, the inelastic losses of relativistic electrons in condensed matter. We present ab initio calculations based on a real-space Green's function approach, implemented in the FEFF8 computer program[1]. Our work focuses on three topics: Relativistic stopping power and associated loss parameters, electron energy loss spectroscopy in high energy transmission electron microscopes, and the inelastic electron scattering mixed dynamic form factor. We calculate, for the first time, ab initio stopping powers and inelastic mean free paths in real materials. The stopping powers are calculated over a broad energy range, from ten eV to above ten MeV. We also present the first ab initio calculations of the "mean excitation energy". We develop a relativistic theory of inelastic electron scattering, based on ab initio calculations of dielectric response, and the generalized Lorenz gauge. Using our relativistic dielectric theory, we calculate the EELS magic angle ratio for boron nitride and for graphite. In these anisotropic materials we find large relativistic corrections to the magic angle for high energy electron microscopes. We also predict and calculate large deviations in the EELS magic angle from the relativistic vacuum predictions in the low energy-loss regime. Finally, we present calculations of mixed dynamic form factor.

  13. Electronic bolus design impacts on administration.

    PubMed

    Hentz, F; Umstätter, C; Gilaverte, S; Prado, O R; Silva, C J A; Monteiro, A L G

    2014-06-01

    Electronic identification of animals has become increasingly important worldwide to improve and ensure traceability. In warm and hot climates, such as Brazil, boluses can have advantages over ear tags as the internal devices reduce the risks of ear tag losses, tissue damage, and lesions on the ear. Electronic boluses, however, are often perceived as having negative characteristics, including reported difficulties of administration in small ruminants. This paper describes the factors associated with bolus design that affect the swallowing of a bolus in sheep. Other factors that might influence bolus swallowing time have also been considered. In addition, the effect of bolus design on its performance was evaluated. A total of 56 Suffolk ewes were used to assess the ease of administration and retention of 3 types of electronic ruminal boluses (mini, 11.5 × 58.0 mm and 21.7 g; small, 14.8 × 48.5 mm and 29.5 g; standard, 19.3 × 69.8 mm and 74.4 g) during a whole productive year, including pregnancy and lamb suckling. Ewe age (5.6 ± 2.3 yr) and weight (85.07 ± 8.2 kg BW) were recorded, as well as time for bolus swallowing. The deglutition of the bolus and any resulting blockages in the esophagus were monitored by visual observations. Retention and readability of the boluses were regularly monitored for d 1, wk 1, mo 1, and every mo until 1 yr. Time for bolus swallowing differed substantially with bolus type and was greater (P < 0.05) for the standard bolus (32.8 ± 6.9 s) when compared to small and mini boluses, which did not differ (8.5 ± 2.0 vs. 9.2 ± 2.7 s; P > 0.05). The bolus o.d. and length were positively correlated with swallowing time (P < 0.01). The ewe weight was negatively correlated with swallowing time (P < 0.05). At 6 mo all electronic boluses showed 100% retention rate, and at 12 mo, bolus retention was 100%, 94.5%, and 100% for mini, small, and standard boluses, respectively (P > 0.05). At 12 mo, all boluses showed 100% readability, except for

  14. White Matter Repair After Extracellular Vesicles Administration in an Experimental Animal Model of Subcortical Stroke

    PubMed Central

    Otero-Ortega, Laura; Laso-García, Fernando; Gómez-de Frutos, María del Carmen; Rodríguez-Frutos, Berta; Pascual-Guerra, Jorge; Fuentes, Blanca; Díez-Tejedor, Exuperio; Gutiérrez-Fernández, María

    2017-01-01

    Mesenchymal stem cells have previously been shown to mediate brain repair after stroke; they secrete 50–100 nm complexes called extracellular vesicles (EVs), which could be responsible for provoking neurovascular repair and functional recovery. EVs have been observed by electron microscopy and NanoSight, and they contain associated proteins such as CD81 and Alix. This purified, homogeneous population of EVs was administered intravenously after subcortical stroke in rats. To evaluate the EVs effects, we studied the biodistribution, proteomics analysis, functional evaluation, lesion size, fiber tract integrity, axonal sprouting and white matter repair markers. We found that a single administration of EVs improved functional recovery, fiber tract integrity, axonal sprouting and white matter repair markers in an experimental animal model of subcortical stroke. EVs were found in the animals’ brain and peripheral organs after euthanasia. White matter integrity was in part restored by EVs administration mediated by molecular repair factors implicated in axonal sprouting, tract connectivity, remyelination and oligodendrogenesis. These findings are associated with improved functional recovery. This novel role for EVs presents a new perspective in the development of biologics for brain repair. PMID:28300134

  15. Electronic Transcripts--EDI in Academic Administration.

    ERIC Educational Resources Information Center

    Carson, E. W.

    1991-01-01

    Newly developed electronic data interchange (EDI) standards for exchanging academic records between colleges and universities are explained. It is argued that implementation of the new standards in college registrar and admissions offices can improve speed, costs, and accuracy and provide a prototype for a variety of campus business applications.…

  16. Electronic duality in strongly correlated matter

    PubMed Central

    Park, T.; Graf, M. J.; Boulaevskii, L.; Sarrao, J. L.; Thompson, J. D.

    2008-01-01

    Superconductivity develops from an attractive interaction between itinerant electrons that creates electron pairs, which condense into a macroscopic quantum state—the superconducting state. On the other hand, magnetic order in a metal arises from electrons localized close to the ionic core and whose interaction is mediated by itinerant electrons. The dichotomy between local moment magnetic order and superconductivity raises the question of whether these two states can coexist and involve the same electrons. Here, we show that the single 4f electron of cerium in CeRhIn5 simultaneously produces magnetism, characteristic of localization, and superconductivity that requires itinerancy. The dual nature of the 4f-electron allows microscopic coexistence of antiferromagnetic order and superconductivity whose competition is tuned by small changes in pressure and magnetic field. Electronic duality contrasts with conventional interpretations of coexisting spin-density magnetism and superconductivity and offers a new avenue for understanding complex states in classes of materials. PMID:18463288

  17. 75 FR 71188 - Open Meeting for the Electronic Tax Administration Advisory Committee (ETAAC)

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-11-22

    ... Internal Revenue Service Open Meeting for the Electronic Tax Administration Advisory Committee (ETAAC... Internal Revenue Service established the Electronic Tax Administration Advisory Committee (ETAAC). The... electronic tax administration issues in support of the overriding goal that paperless filing should be...

  18. 78 FR 32306 - Open Meeting for the Electronic Tax Administration Advisory Committee (ETAAC)

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-05-29

    ... Internal Revenue Service Open Meeting for the Electronic Tax Administration Advisory Committee (ETAAC... Electronic Tax Administration Advisory Committee (ETAAC) will be conducted via telephone conference call. The ETAAC will discuss recommendations for electronic tax administration which will be published in...

  19. 75 FR 30109 - Open Meeting for the Electronic Tax Administration Advisory Committee (ETAAC)

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-05-28

    ... Internal Revenue Service Open Meeting for the Electronic Tax Administration Advisory Committee (ETAAC... Internal Revenue Service established the Electronic Tax Administration Advisory Committee (ETAAC). The... electronic tax administration issues in support of the overriding goal that paperless filing should be...

  20. Quantum Electronic Matter in Two Dimensions

    SciTech Connect

    Eisenstein, James

    2015-01-27

    Most often, the electrical properties of a material are described as either "conducting" or "insulating". Copper, everyone knows, is a good conductor. It is the foundation of the electrical infrastructure of the nation. Glass, on the other hand, is an excellent insulator. But do these two words describe all the possibilities? The answer is emphatically no, and the basic subject of the research funded by this grant is aimed at fleshing out a more complete description of the electrical properties of materials. Many people are aware that there are also special materials called superconductors. A superconductor (e.g. aluminum when cooled to very low temperatures) is like a regular conductor except that it conducts electricity with no energy loss at all. Ordinary metals get hot when current flows through them; witness the toaster in your kitchen. In a superconductor something very special is going on: The electrons in the metal don't behave individually as they do in an ordinary conductor. Instead they act collectively. It is this collective aspect that makes superconductors so interesting to physicists. So now we have metals, insulators and superconductors. Is there anything else? We now know the answer is yes. In this research we examine special conducting materials, ones in which the mobile electrons are confined to move on a plane surface (as opposed to motion in all three directions). Examples of such "2D" materials include electrons confined to the interface between two otherwise insulating materials (as in the so-called "semiconductor heterostructures" used here) and the single atomic layer of carbon atoms now known as "graphene". Materials like these are not just museum curiosities; each of the billions of transistors in every smart-phone has a 2D electron system in it. In the work supported by this grant, the focus is on both collective conducting states in semiconductor heterostructures and on the conducting properties of graphene and its few-layer cousins. In

  1. How Student Data Matters in Writing Program Administration

    ERIC Educational Resources Information Center

    Cordaro, Danielle A.

    2010-01-01

    The writing program administration literature in rhetoric and composition has long advocated the use of local data to determine the direction each writing program should take. Using a mixed-method design employing a standard survey and in-depth interviews, this dissertation describes how writing programs across institutional and programmatic…

  2. Of Dirty Sheets and Worse: Administration Costs and Staffing Matters.

    ERIC Educational Resources Information Center

    Keigher, Sharon M.

    1993-01-01

    Considers article written by professor of social welfare in 1981 in which job security of social workers is addressed. Compares views expressed in 1981 with situation faced by social workers today. Considers danger of administration costs resulting in short-staffing of hospitals serving the poor and discusses case of 22-year-old obstetrics patient…

  3. Leadership Competency Preferences of Student Affairs Administrators: Does Generation Matter?

    ERIC Educational Resources Information Center

    Katherine, Lindsey

    2011-01-01

    The purpose of this study was to identify the leadership competencies and characteristics that are "preferred" by student affairs administrators, and to compare these preferences across generations to determine if there were any differences. The term "preferred" was used to indicate that the study asked respondents to assign a value or a level of…

  4. Functional Complexity in Soft Electronic Matter

    SciTech Connect

    Bishop, Alan

    2006-08-04

    A substantial change is presently taking place in experimental and theoretical approaches to large classes of "strongly correlated" materials. The change reflects growing evidence that multiscale complexity (in space and time) is frequently both intrinsic and functional, and further, that intimate relationships between hierarchies of functional scales consitute essential "Systems" or "Networks." This complexity provides qualitatively new avenues for predictive design of technological materaisl, including instrically nanoscale structures. In the search for underpinning concepts and principles, the prevalence of local constraints and coexisting short- and long-range forces have become apparent as keys to some major class of materaisl with emergent "landscapes" of spatio-temporal patterns and associated glassy dynamics and statistics. This talk reviews our recent work in these directions in the context of elastically-driven textures in (a) directionally-bonded electronic materials, including superonducting, magnetoresistant, and ferroelectric oxides; and (b) bubble opening patterns in DNA. Underscored is the importance of suites of experimental probes being applied to establish the networks of functional scales: microscopic to mesoscopic to macroscopic. Recent advances in angle-resolved photoemission and inelastic neutron scattering experimental techniques are particularly valuable in this regard.

  5. 26 CFR 301.6227(c)-1 - Administrative adjustment request by the tax matters partner on behalf of the partnership.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... matters partner on behalf of the partnership. 301.6227(c)-1 Section 301.6227(c)-1 Internal Revenue... tax matters partner on behalf of the partnership shall be filed on the form prescribed by the Internal... ADMINISTRATION Assessment In General § 301.6227(c)-1 Administrative adjustment request by the tax matters...

  6. 26 CFR 301.6227(c)-1 - Administrative adjustment request by the tax matters partner on behalf of the partnership.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... matters partner on behalf of the partnership. 301.6227(c)-1 Section 301.6227(c)-1 Internal Revenue... tax matters partner on behalf of the partnership shall be filed on the form prescribed by the Internal... ADMINISTRATION Assessment In General § 301.6227(c)-1 Administrative adjustment request by the tax matters...

  7. 77 FR 70879 - Open Meeting for the Electronic Tax Administration Advisory Committee (ETAAC)

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-11-27

    ... Internal Revenue Service Open Meeting for the Electronic Tax Administration Advisory Committee (ETAAC... Internal Revenue Service established the Electronic Tax Administration Advisory Committee (ETAAC). The primary purpose of ETAAC is to provide an organized public forum for discussion of electronic...

  8. X-Ray Free Electron Laser Interaction With Matter

    SciTech Connect

    Hau-Riege, S

    2009-05-12

    X-ray free electron lasers (XFELs) will enable studying new areas of laser-matter interaction. We summarize the current understanding of the interaction of XFEL pulses with matter and describe some of the simulation approaches that are used to design experiments on future XFEL sources. Modified versions of these models have been successful in guiding and analyzing experiments performed at the extreme-ultraviolet FEL FLASH at wavelengths of 6 nm and longer. For photon energies of several keV, no XFEL-matter interaction experiments have been performed yet but data is anticipated to become available in the near future, which will allow to test our understanding of the interaction physics in this wavelength regime.

  9. Dating carbonaceous matter in archean cherts by electron paramagnetic resonance.

    PubMed

    Bourbin, M; Gourier, D; Derenne, S; Binet, L; Le Du, Y; Westall, F; Kremer, B; Gautret, P

    2013-02-01

    Ancient geological materials are likely to be contaminated through geological times. Thus, establishing the syngeneity of the organic matter embedded in a mineral matrix is a crucial step in the study of very ancient rocks. This is particularly the case for Archean siliceous sedimentary rocks (cherts), which record the earliest traces of life. We used electron paramagnetic resonance (EPR) for assessing the syngeneity of organic matter in cherts that have a metamorphic grade no higher than greenschist. A correlation between the age of Precambrian samples and the shape of their EPR signal was established and statistically tested. As thermal treatments impact organic matter maturity, the effect of temperature on this syngeneity proxy was studied; cyanobacteria were submitted to cumulative short thermal treatment at high temperatures followed by an analysis of their EPR parameters. The resulting carbonaceous matter showed an evolution similar to that of a thermally treated young chert. Furthermore, the possible effect of metamorphism, which is a longer thermal event at lower temperatures, was ruled out for cherts older than 2 Gyr, based on the study of Silurian cherts of the same age and same precursors but various metamorphic grades. We determined that even the most metamorphosed sample did not exhibit the lineshape of an Archean sample. In the hope of detecting organic contamination in Archean cherts, a "contamination-like" mixture was prepared and studied by EPR. It resulted that the lineshape analysis alone does not allow contamination detection and that it must be performed along with cumulative thermal treatments. Such treatments were applied to three Archean chert samples, making dating of their carbonaceous matter possible. We concluded that EPR is a powerful tool to study primitive organic matter and could be used in further exobiology studies on low-metamorphic grade samples (from Mars for example).

  10. Speaking out on Matters of Public Concern: The Precarious Nature of School Administrator Speech

    ERIC Educational Resources Information Center

    Geisel, Richard T.

    2015-01-01

    The purpose of this paper is to highlight current U.S. Supreme Court precedents regarding public employee speech on matters of public concern, and how those precedents are being applied by lower federal courts to public school administrators. Surveying the current legal landscape reveals a heightened vulnerability for school administrators…

  11. 32 CFR 37.800 - Which administrative matters are covered in this subpart?

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 32 National Defense 1 2010-07-01 2010-07-01 false Which administrative matters are covered in this subpart? 37.800 Section 37.800 National Defense Department of Defense OFFICE OF THE SECRETARY OF DEFENSE DoD GRANT AND AGREEMENT REGULATIONS TECHNOLOGY INVESTMENT AGREEMENTS Award Terms Related to...

  12. 32 CFR 37.800 - Which administrative matters are covered in this subpart?

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... 32 National Defense 1 2012-07-01 2012-07-01 false Which administrative matters are covered in this subpart? 37.800 Section 37.800 National Defense Department of Defense OFFICE OF THE SECRETARY OF DEFENSE DoD GRANT AND AGREEMENT REGULATIONS TECHNOLOGY INVESTMENT AGREEMENTS Award Terms Related to...

  13. 32 CFR 37.600 - Which administrative matters are covered in this subpart?

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... 32 National Defense 1 2011-07-01 2011-07-01 false Which administrative matters are covered in this subpart? 37.600 Section 37.600 National Defense Department of Defense OFFICE OF THE SECRETARY OF DEFENSE DoD GRANT AND AGREEMENT REGULATIONS TECHNOLOGY INVESTMENT AGREEMENTS Award Terms...

  14. 32 CFR 37.600 - Which administrative matters are covered in this subpart?

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... 32 National Defense 1 2012-07-01 2012-07-01 false Which administrative matters are covered in this subpart? 37.600 Section 37.600 National Defense Department of Defense OFFICE OF THE SECRETARY OF DEFENSE DoD GRANT AND AGREEMENT REGULATIONS TECHNOLOGY INVESTMENT AGREEMENTS Award Terms...

  15. Electron conductivity in warm and hot dense matter

    NASA Astrophysics Data System (ADS)

    Starrett, Charles; Charest, Marc; Feinblum, David; Burrill, Daniel

    2015-11-01

    The electronic conductivity of warm and hot dense matter is investigated by combining the Ziman-Evans approach with the recently developed pseudo-atom molecular dynamics (PAMD) method. PAMD gives an accurate description of the electronic and ionic structure of the plasma. The Ziman-Evans approach to conductivity, which takes the electronic and ionic structures as inputs, has been widely used but with numerous different assumptions on these inputs. Here we present a systematic study of these assumptions by comparing results to gold-standard QMD results that are thought to be accurate but are very expensive to produce. The study reveals that some assumptions yield very inaccurate results and should not be used, while others give consistently reasonable results. Finally, we show that the Thomas-Fermi version of PAMD can also be used to give accurate conductivities very rapidly, taking a few minutes per point on a single processor.

  16. Rejection of Electronic Recoils with the DMTPC Dark Matter Search

    NASA Astrophysics Data System (ADS)

    Lopez, J. P.; Ahlen, S.; Battat, J.; Caldwell, T.; Chernicoff, M.; Deaconu, C.; Dujmic, D.; Dushkin, A.; Fedus, W.; Fisher, P.; Golub, F.; Henderson, S.; Inglis, A.; Kaboth, A.; Kohse, G.; Kirsch, L.; Lanza, R.; Lee, A.; Monroe, J.; Ouyang, H.; Sahin, T.; Sciolla, G.; Skvorodnev, N.; Tomita, H.; Wellenstein, H.; Wolfe, I.; Yamamoto, R.; Yegoryan, H.

    The Dark Matter Time Projection Chamber (DMTPC) collaboration is developing a low-pressure gas TPC for detecting WIMP-nucleon interactions. DMTPC detectors use optical readout with CCD cameras to search for the daily modulation of the directional signal of the dark matter wind. An analysis of several charge readout channels has been developed to obtain additional information about ionization events in the detector. In order to reach sensitivities required for the WIMP detection, the detector needs to minimize backgrounds from electron recoils. This article shows that by using the readout of charge signals in addition to CCD readout, a preliminary statistics-limited 90% C.L. upper limit on the γ and e- rejection factor of 5.6 × 10-6 is obtained for energies between 40 keVee and 200 keVee.

  17. 21 CFR 10.205 - Electronic media coverage of public administrative proceedings.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... 21 Food and Drugs 1 2010-04-01 2010-04-01 false Electronic media coverage of public administrative... SERVICES GENERAL ADMINISTRATIVE PRACTICES AND PROCEDURES Electronic Media Coverage of Public Administrative Proceedings; Guideline on Policy and Procedures § 10.205 Electronic media coverage of public...

  18. 21 CFR 10.205 - Electronic media coverage of public administrative proceedings.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... 21 Food and Drugs 1 2011-04-01 2011-04-01 false Electronic media coverage of public administrative... SERVICES GENERAL ADMINISTRATIVE PRACTICES AND PROCEDURES Electronic Media Coverage of Public Administrative Proceedings; Guideline on Policy and Procedures § 10.205 Electronic media coverage of public...

  19. 76 FR 12793 - Open Meeting for the Electronic Tax Administration Advisory Committee (ETAAC)

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-03-08

    ... Internal Revenue Service Open Meeting for the Electronic Tax Administration Advisory Committee (ETAAC... Internal Revenue Service established the Electronic Tax Administration Advisory Committee (ETAAC).The... electronic tax administration issues in support of the overriding goal that paperless filing should be...

  20. 21 CFR 10.205 - Electronic media coverage of public administrative proceedings.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ... 21 Food and Drugs 1 2014-04-01 2014-04-01 false Electronic media coverage of public administrative... SERVICES GENERAL ADMINISTRATIVE PRACTICES AND PROCEDURES Electronic Media Coverage of Public Administrative Proceedings; Guideline on Policy and Procedures § 10.205 Electronic media coverage of public...

  1. 21 CFR 10.205 - Electronic media coverage of public administrative proceedings.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ... 21 Food and Drugs 1 2012-04-01 2012-04-01 false Electronic media coverage of public administrative... SERVICES GENERAL ADMINISTRATIVE PRACTICES AND PROCEDURES Electronic Media Coverage of Public Administrative Proceedings; Guideline on Policy and Procedures § 10.205 Electronic media coverage of public...

  2. 21 CFR 10.205 - Electronic media coverage of public administrative proceedings.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ... 21 Food and Drugs 1 2013-04-01 2013-04-01 false Electronic media coverage of public administrative... SERVICES GENERAL ADMINISTRATIVE PRACTICES AND PROCEDURES Electronic Media Coverage of Public Administrative Proceedings; Guideline on Policy and Procedures § 10.205 Electronic media coverage of public...

  3. 76 FR 22918 - In the Matter of Certain Handheld Electronic Computing Devices, Related Software, and Components...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-04-25

    ... COMMISSION In the Matter of Certain Handheld Electronic Computing Devices, Related Software, and Components... States after importation of certain handheld electronic computing devices, related software, and... importation of certain handheld electronic computing devices, related software, and components thereof...

  4. Evaluation of a BCMA’s Electronic Medication Administration Record

    PubMed Central

    Staggers, Nancy; Iribarren, Sarah; Guo, Jia-Wen; Weir, Charlene

    2015-01-01

    Barcode medication administration (BCMA) systems can reduce medication errors, but sociotechnical issues are quite common. Although crucial to nurses’ work, few usability evaluations are available for electronic medication administration record screens (eMARs). The purpose of this research was to identify current usability problems in the VA’s eMAR/BCMA system and explore how these might impact nurses’ situation awareness. Three expert evaluators used 10 tasks/elements, heuristic evaluation techniques and explored potential impacts using a situation awareness perspective. The results yielded 99 usability problems categorized into 440 heuristic violations with the largest volume in the category of Match with the Real World. Fifteen usability issues were rated as catastrophic with the Administer/Chart medications task having the most. Situational awareness was impacted at all levels, especially at Level 2, Comprehension. Usability problems point to important areas for improvement because these issues have the potential to impact nurses’ situation awareness, “at a glance” information, nurse productivity and patient safety. PMID:25601936

  5. Visible and dark matter genesis and cosmic positron and electron excesses

    SciTech Connect

    Gu Peihong; Sarkar, Utpal; Zhang Xinmin

    2009-10-01

    Dark and baryonic matter contribute comparable energy density to the present universe. The dark matter may also be responsible for the cosmic positron and electron excesses. We connect these phenomena with the Dirac seesaw for neutrino masses. In our model (i) the dark matter relic density is a dark matter asymmetry generated simultaneously with the baryon asymmetry so that we can naturally understand the coincidence between the dark and baryonic matter and (ii) the dark matter mostly decays into the leptons so that its decay can interpret the anomalous cosmic rays with positron and electron excesses.

  6. Application of models for exchange of electronic documents in complex administrative services

    NASA Astrophysics Data System (ADS)

    Glavev, Victor

    2015-11-01

    The report presents application of models for exchange of electronic documents between different administrations in government and business sectors. It shows the benefits of implementing electronic exchange of documents between different local offices of one administration in government sector such as a municipality and the way it is useful for implementing complex administrative services.

  7. Application of models for exchange of electronic documents in complex administrative services

    SciTech Connect

    Glavev, Victor

    2015-11-30

    The report presents application of models for exchange of electronic documents between different administrations in government and business sectors. It shows the benefits of implementing electronic exchange of documents between different local offices of one administration in government sector such as a municipality and the way it is useful for implementing complex administrative services.

  8. 21 CFR 10.206 - Procedures for electronic media coverage of agency public administrative proceedings.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... 21 Food and Drugs 1 2010-04-01 2010-04-01 false Procedures for electronic media coverage of agency..., DEPARTMENT OF HEALTH AND HUMAN SERVICES GENERAL ADMINISTRATIVE PRACTICES AND PROCEDURES Electronic Media... electronic media coverage of agency public administrative proceedings. (a) To facilitate the...

  9. 21 CFR 10.206 - Procedures for electronic media coverage of agency public administrative proceedings.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... 21 Food and Drugs 1 2011-04-01 2011-04-01 false Procedures for electronic media coverage of agency..., DEPARTMENT OF HEALTH AND HUMAN SERVICES GENERAL ADMINISTRATIVE PRACTICES AND PROCEDURES Electronic Media... electronic media coverage of agency public administrative proceedings. (a) To facilitate the...

  10. Drug Enforcement Administration Western Lab wins EPA Federal Green Challenge award for electronics recycling

    EPA Pesticide Factsheets

    SAN FRANCISCO - Today, the U.S. Environmental Protection Agency Regional Administrator Jared Blumenfeld presented the Federal Green Challenge award to the Drug Enforcement Administration (DEA) Western Laboratory for increasing its electronics recycling mor

  11. 76 FR 24051 - In the Matter of Certain Electronic Devices, Including Mobile Phones, Mobile Tablets, Portable...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-04-29

    ... importation of certain electronic devices, including mobile phones, mobile tablets, portable music players... COMMISSION In the Matter of Certain Electronic Devices, Including Mobile Phones, Mobile Tablets, Portable Music Players, and Computers, and Components Thereof; Notice of Institution of Investigation AGENCY:...

  12. 76 FR 45860 - In the Matter of Certain Electronic Devices, Including Wireless Communication Devices, Portable...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-08-01

    ... COMMISSION In the Matter of Certain Electronic Devices, Including Wireless Communication Devices, Portable Music and Data Processing Devices, and Tablet Computers; Notice of Institution of Investigation... within the United States after importation of certain electronic devices, including...

  13. 75 FR 4631 - Open Season for Membership to the Electronic Tax Administration Advisory Committee (ETAAC)

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-01-28

    ... implementation of the Internal Revenue Service (IRS) strategy for electronic tax administration. The ETAAC... options and best practices), (8) system integrators (technology providers), (9) academic (marketing,...

  14. Electron Shuttling Capacity of Solid-Phase Organic Matter in Forest Soils

    NASA Astrophysics Data System (ADS)

    Patel, A.; Zhao, Q.; Yang, Y.

    2015-12-01

    Soil organic matter, as an electron shuttle, plays an important role in regulating the biogeochemical cycles of metals, especially the redox reactions for iron. Microorganisms can reduce soil organic matter under anaerobic conditions, and biotically-reduced soil organic matter can abiotically donate electrons to ferric oxides. Such soil organic matter-mediated electron transport can facilitate the interactions between microorganisms and insoluble terminal electron acceptors, i.e. iron minerals. Most previous studies have been focused on the electron shuttling processes through dissolved soil organic matter, and scant information is available for solid-phase soil organic matter. In this study, we aim to quantify the electron accepting capacity for solid-phase organic matter in soils collected from four different forests in the United States, including Truckee (CA), Little Valley (NV), Howland (ME) and Hart (MI). We used Shewanella oneidensisMR-1 to biotically reduce soil slurries, and then quantified the electrons transferred to solid-phase and solution-phase organic matter by reacting them with Fe(III)-nitrilotriacetic acid (Fe(III)-NTA). The generation of Fe(II) was measured by a ferrozine assay to calculate the electron accepting capacity of soil organic matter. Our preliminary results showed that the Truckee soil organic matter can accept 0.51±0.07 mM e-/mol carbon. We will measure the electron accepting capacity for four different soils and correlate them to the physicochemical properties of soils. Potential results will provide information about the electron accepting capacity of solid-phase soil organic matter and its governing factors, with broad implication on the coupled biogeochemical cycles of carbon and iron.

  15. ASTROPHYSICS. Exclusion of leptophilic dark matter models using XENON100 electronic recoil data.

    PubMed

    2015-08-21

    Laboratory experiments searching for galactic dark matter particles scattering off nuclei have so far not been able to establish a discovery. We use data from the XENON100 experiment to search for dark matter interacting with electrons. With no evidence for a signal above the low background of our experiment, we exclude a variety of representative dark matter models that would induce electronic recoils. For axial-vector couplings to electrons, we exclude cross sections above 6 × 10(-35) cm(2) for particle masses of m(χ) = 2 GeV/c(2). Independent of the dark matter halo, we exclude leptophilic models as an explanation for the long-standing DAMA/LIBRA signal, such as couplings to electrons through axial-vector interactions at a 4.4σ confidence level, mirror dark matter at 3.6σ, and luminous dark matter at 4.6σ.

  16. Optical Response of Warm Dense Matter Using Real-Time Electron Dynamics

    NASA Astrophysics Data System (ADS)

    Baczewski, Andrew; Shulenburger, Luke; Desjarlais, Michael; Magyar, Rudolph

    2014-03-01

    The extreme temperatures and solid-like densities in warm dense matter present a unique challenge for theory, wherein neither conventional models from condensed matter nor plasma physics capture all of the relevant phenomenology. While Kubo-Greenwood DFT calculations have proven capable of reproducing optical properties of WDM, they require a significant number of virtual orbitals to reach convergence due to their perturbative nature. Real-time TDDFT presents a complementary framework with a number of computationally favorable properties, including reduced cost complexity and better scalability, and has been used to reproduce the optical response of finite and ordered extended systems. We will describe the use of Ehrenfest-TDDFT to evolve coupled electron-nuclear dynamics in WDM systems, and the subsequent evaluation of optical response functions from the real-time electron dynamics. The advantages and disadvantages of this approach will be discussed relative to the current state-of-the-art. Sandia National Laboratories is a multi-program laboratory managed and operated by Sandia Corporation, a wholly owned subsidiary of Lockheed Martin Corporation, for the U.S. Department of Energy's National Security Administration under contract DE-AC04-94AL85000.

  17. 77 FR 1555 - Administrative Simplification: Adoption of Standards for Health Care Electronic Funds Transfers...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-01-10

    ... and 162 Administrative Simplification: Adoption of Standards for Health Care Electronic Funds... Health Care Electronic Funds Transfers (EFTs) and Remittance Advice AGENCY: Office of the Secretary, HHS... facilitate health care EFT transmissions. DATES: Effective Date: These regulations are effective on...

  18. LIPSS Free-Electron Laser Searches for Dark Matter

    SciTech Connect

    Afanaciev, Andrei; Beard, Kevin; Biallas, George; Boyce, James R; Minarni, M; Ramdon, R; Robinson, Taylor; Shinn, Michelle D; Slocum, P

    2011-09-01

    A variety of Dark Matter particle candidates have been hypothesized by physics Beyond the Standard Model (BSM) in the very light (10{sup -6} - 10{sup -3} eV) range. In the past decade several international groups have conducted laboratory experiments designed to either produce such particles or extend the boundaries in parameter space. The LIght Pseudo-scalar and Scalar Search (LIPSS) Collaboration, using the 'Light Shining through a Wall' (LSW) technique, passes the high average power photon beam from Jefferson Lab's Free-Electron Laser through a magnetic field upstream from a mirror and optical beam dump. Light Neutral Bosons (LNBs), generated by coupling of photons with the magnetic field, pass through the mirror ('the Wall') into an identical magnetic field where they revert to detectable photons by the same coupling process. While no evidence of LNBs was evident, new scalar coupling boundaries were established. New constraints were also determined for hypothetical para-photons and for millicharged fermions. We will describe our experimental setup and results for LNBs, para-photons, and milli-charged fermions. Plans for chameleon particle searches are underway.

  19. Detecting electron neutrinos from solar dark matter annihilation by JUNO

    SciTech Connect

    Guo, Wan-Lei

    2016-01-21

    We explore the electron neutrino signals from light dark matter (DM) annihilation in the Sun for the large liquid scintillator detector JUNO. In terms of the spectrum features of three typical DM annihilation channels χχ→νν-bar,τ{sup +}τ{sup −},bb-bar, we take two sets of selection conditions to calculate the expected signals and atmospheric neutrino backgrounds based on the Monte Carlo simulation data. Then the JUNO sensitivities to the spin independent DM-nucleon and spin dependent DM-proton cross sections are presented. It is found that the JUNO projected sensitivities are much better than the current spin dependent direct detection experimental limits for the νν-bar and τ{sup +}τ{sup −} channels. In the spin independent case, the JUNO will give the better sensitivity to the DM-nucleon cross section than the LUX and CDMSlite limits for the νν-bar channel with the DM mass lighter than 6.5 GeV. If the νν-bar or τ{sup +}τ{sup −} channel is dominant, the future JUNO results are very helpful for us to understand the tension between the DAMA annual modulation signal and other direct detection exclusions.

  20. Dark matter electron anisotropy: A universal upper limit

    NASA Astrophysics Data System (ADS)

    Borriello, Enrico; Maccione, Luca; Cuoco, Alessandro

    2012-03-01

    We study the dipole anisotropy in the arrival directions of high energy CR electrons and positrons (CRE) of dark matter (DM) origin. We show that this quantity is very weakly model dependent and offers a viable criterion to discriminate among CRE from DM or from local discrete sources, like e.g. pulsars. In particular, we find that the maximum anisotropy which DM can provide is to a very good approximation a universal quantity and, as a consequence, if a larger anisotropy is detected, this would constitute a strong evidence for the presence of astrophysical local discrete CRE sources, whose anisotropy, instead, can be naturally larger than the DM upper limit. We further find that the main source of anisotropy from DM is given by the fluctuation in the number density of DM sub-structures in the vicinity of the observer and we thus devote special attention to the study of the variance in the sub-structures realization implementing a dedicated Montecarlo simulation. Such scenarios will be probed in the next years by Fermi-LAT, providing new hints, or constraints, about the nature of DM.

  1. Detecting electron neutrinos from solar dark matter annihilation by JUNO

    SciTech Connect

    Guo, Wan-Lei

    2016-01-01

    We explore the electron neutrino signals from light dark matter (DM) annihilation in the Sun for the large liquid scintillator detector JUNO. In terms of the spectrum features of three typical DM annihilation channels χχ → νν-bar , τ{sup +}τ{sup −}, b b-bar , we take two sets of selection conditions to calculate the expected signals and atmospheric neutrino backgrounds based on the Monte Carlo simulation data. Then the JUNO sensitivities to the spin independent DM-nucleon and spin dependent DM-proton cross sections are presented. It is found that the JUNO projected sensitivities are much better than the current spin dependent direct detection experimental limits for the νν-bar and τ{sup +}τ{sup −} channels. In the spin independent case, the JUNO will give the better sensitivity to the DM-nucleon cross section than the LUX and CDMSlite limits for the νν-bar channel with the DM mass lighter than 6.5 GeV . If the νν-bar or τ{sup +}τ{sup −} channel is dominant, the future JUNO results are very helpful for us to understand the tension between the DAMA annual modulation signal and other direct detection exclusions.

  2. Electron Matter Optics and the Quantum Electron Stern-Gerlach Magnet

    NASA Astrophysics Data System (ADS)

    McGregor, Scot; Bach, Roger; Yin, Xiaolu; Liou, Sy-Hwang; Batelaan, Herman; Gronniger, Glen

    2011-05-01

    We explore electron interferometry for the purpose of performing fundamental quantum mechanical experiments and sensing applications. To this end electron matter optics elements, in particular, a diffraction limited single slit, a double slit, and a nano-fabricated grating diffraction apparatus as well as a Mach-Zehnder IFM were previously developed. The double slit diffraction pattern has been recorded one electron at a time. Furthermore, the capability of closing each slit on demand has been developed, in that way realizing the thought experiment that Feynman explains in his lectures. The capability of the Mach-Zehnder interferometer to sense DC and AC electromagnetic fields for industrial applications is currently under investigation. Also, the construction of a new type of interferometer that has the potential to significantly increase the enclosed area and thus its sensitivity is in progress. Finally an idea to separate an electron beam fully into its two spin component using an electron interferometer is presented. We gratefully acknowledge funding by NSF Grant No. 0969506 and R. B. and S. M. acknowledge DOE-GAANN fellowships.

  3. Final report for the Department of Energy funded cooperative agreement ''Electronic Research Demonstration Project'' [University electronic research administration demonstration project

    SciTech Connect

    Rodman, John

    1998-07-31

    This is the final report for the Department of Energy (DOE) funded cooperative agreement ''Electronic Research Demonstration Project (DE-FC02-92ER35180)'' for the period August 1994-July 1998. The goal of the project, referred to as NewERA, was to demonstrate the use of open standards for electronic commerce to support research administration, otherwise referred to as Electronic Research Administration (ERA). The NewERA demonstration project provided a means to test interagency standards developed within the Federal Grant Electronic Commerce Committee, a group comprised of federal granting agencies. The NewERA program was initiated by DOE. NewERA was comprised of three separate, but related, ERA activities in preaward administration, postaward administration, and secure Internet commerce. The goal of New ERA was to demonstrate an open standard implementation of ERA using electronic data interchange, e-mail and Internet transaction security between grant applicants and DOE, along with t h e other participating agencies.

  4. 21 CFR 10.206 - Procedures for electronic media coverage of agency public administrative proceedings.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ... 21 Food and Drugs 1 2012-04-01 2012-04-01 false Procedures for electronic media coverage of agency public administrative proceedings. 10.206 Section 10.206 Food and Drugs FOOD AND DRUG ADMINISTRATION..., Food and Drug Administration, 5600 Fishers Lane, Rockville, MD 20857, in writing or by...

  5. 75 FR 4583 - In the Matter of: Certain Electronic Devices, Including Mobile Phones, Portable Music Players...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-01-28

    ... COMMISSION In the Matter of: Certain Electronic Devices, Including Mobile Phones, Portable Music Players, and... electronic devices, including mobile phones, portable music players, and computers, by reason of infringement... electronic docket (EDIS) at http://edis.usitc.gov . FOR FURTHER INFORMATION CONTACT: Rett Snotherly,...

  6. Electron ejection by heavy particles as precursor of track formation in condensed matter

    NASA Astrophysics Data System (ADS)

    Rothard, Hermann

    2004-08-01

    The detailed knowledge of the structure of ion tracks is a key issue for our understanding of radiation effects in condensed matter. Important examples are the radial energy deposition profile by electronic excitation for numerical simulations of track formation (via "Coulomb explosion" or "thermal spike") in inert matter, and calculations of the RBE (relative biological effectiveness) of heavy particles in living matter (with important applications in dosimetry and hadrontherapy). In both cases, differential electron ejection cross sections are used as input parameter. The precursor of track formation is thus electron ejection from target atoms, or from the projectile itself. These primary electrons and their subsequent secondary interactions lead to the deposition of energy along and around the ion trajectory. We first briefly discuss "primary ionization" (binary encounter and soft electron emission, multiple collision sequences: "Fermi shuttle") common to single atoms (gas targets) and condensed matter. Then, specific effects in condensed matter (electron transport, jet-like electron spikes, wake effects due to collective excitation of plasmons and emission of shock wave electrons) will be presented. Finally, we concentrate on effects connected to the high density of deposited energy and strong perturbation induced by heavy particles such as heavy ions and clusters (reduction effects due to screening, transport and "sweeping away", multiple ionization, electronic temperatures from Auger spectroscopy).

  7. Electronic Survey Administration: Assessment in the Twenty-First Century

    ERIC Educational Resources Information Center

    Olsen, Danny R.; Wygant, Steven A.; Brown, Bruce L.

    2004-01-01

    Recent advances in electronic data collection have opened broad new possibilities for educational assessment. Potentially significant savings in time, money, and effort make Web-based and e-mail-based surveys more and more attractive as alternatives to mail surveys and face-to-face interviews. Yet, as with any major change, questions and obstacles…

  8. Subcortical gray matter changes in transgender subjects after long-term cross-sex hormone administration.

    PubMed

    Seiger, Rene; Hahn, Andreas; Hummer, Allan; Kranz, Georg S; Ganger, Sebastian; Woletz, Michael; Kraus, Christoph; Sladky, Ronald; Kautzky, Alexander; Kasper, Siegfried; Windischberger, Christian; Lanzenberger, Rupert

    2016-12-01

    Sex-steroid hormones are primarily involved in sexual differentiation and development and are thought to underlie processes related to cognition and emotion. However, divergent results have been reported concerning the effects of hormone administration on brain structure including side effects like brain atrophy and dementia. Cross-sex hormone therapy in transgender subjects offers a unique model for studying the effects of sex hormones on the living human brain. In this study, 25 Female-to-Male (FtM) and 14 Male-to-Female (MtF) subjects underwent MRI examinations at baseline and after a period of at least 4-months of continuous cross-sex hormone administration. While MtFs received estradiol and anti-androgens, FtM subjects underwent high-dose testosterone treatment. The longitudinal processing stream of the FreeSurfer software suite was used for the automated assessment and delineation of brain volumes to assess the structural changes over the treatment period of cross-sex hormone administration. Most prominent results were found for MtFs receiving estradiol and anti-androgens in the form of significant decreases in the hippocampal region. Further analysis revealed that these decreases were reflected by increases in the ventricles. Additionally, changes in progesterone levels correlated with changes in gray matter structures in MtF subjects. In line with prior studies, our results indicate hormonal influences on subcortical structures related to memory and emotional processing. Additionally, this study adds valuable knowledge that progesterone may play an important role in this process.

  9. High Energy Electron Signals from Dark Matter Annihilation in the Sun

    SciTech Connect

    Schuster, Philip; Toro, Natalia; Weiner, Neal; Yavin, Itay; /New York U., CCPP

    2012-04-09

    In this paper we discuss two mechanisms by which high energy electrons resulting from dark matter annihilations in or near the Sun can arrive at the Earth. Specifically, electrons can escape the sun if DM annihilates into long-lived states, or if dark matter scatters inelastically, which would leave a halo of dark matter outside of the sun. Such a localized source of electrons may affect the spectra observed by experiments with narrower fields of view oriented towards the sun, such as ATIC, differently from those with larger fields of view such as Fermi. We suggest a simple test of these possibilities with existing Fermi data that is more sensitive than limits from final state radiation. If observed, such a signal will constitute an unequivocal signature of dark matter.

  10. Low Energy X-Ray and Electron Interactions within Matter.

    DTIC Science & Technology

    1980-03-01

    Microscopy at Pomona College," Norelco Reporter, VII, 137 (1960). b."Isolation of Selected Elements with an Electron Microscope ," Norelco Reporter...38. "Measurement of Primary Electron Interaction Coefficients (500 to 1500 eV Region," Colloque International du C.N.R.S., Processus Electroniques

  11. Stopping and transport of fast electrons in superdense matter

    SciTech Connect

    Okabayashi, A.; Habara, H.; Yabuuchi, T.; Iwawaki, T.; Tanaka, K. A.

    2013-08-15

    Studied is the stopping and transport of relativistic fast electrons in the vicinity of compressed dense plasma core relevant to fast ignition. Electromagnetic cascade Monte-Carlo is coupled to 2D-PIC simulation. The 2D PIC simulates input electron energy spectrum and angular dependence. The electron energy distributions after passing through the plasma core are calculated at different viewing angles, which well agree with the experiment below several MeV energy range. The implications of calculated results as to collisional damping on several MeV electrons are discussed with the theory based on the stopping power model. The spatial distribution of plasma temperature is also estimated via deposited energy by fast electrons, showing the strong heating at the core surface.

  12. High Energy Cosmic Electrons: Messengers from Nearby Cosmic Ray Sources or Dark Matter?

    NASA Technical Reports Server (NTRS)

    Moiseev, Alexander

    2011-01-01

    This slide presentation reviews the recent discoveries by the Large Area Telescope (LAT) and the Gamma-ray Burst Monitor (GBM) on board the Fermi Gamma-Ray Telescope in reference to high energy cosmic electrons, and whether their source is cosmic rays or dark matter. Specific interest is devoted to Cosmic Ray electrons anisotropy,

  13. 76 FR 12994 - In the Matter of Certain Digital Televisions and Components Thereof, and Certain Electronic...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-03-09

    ... COMMISSION In the Matter of Certain Digital Televisions and Components Thereof, and Certain Electronic... Electronics, Inc. The complaint alleges violations of section 337 based upon the importation into the United... digital televisions and components thereof by reason of infringement of certain claims of U.S. Patent...

  14. 76 FR 41522 - In the Matter of Certain Electronic Devices, Including Mobile Phones, Mobile Tablets, Portable...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-07-14

    ... COMMISSION In the Matter of Certain Electronic Devices, Including Mobile Phones, Mobile Tablets, Portable Music Players, and Computers, and Components Thereof; Notice of Commission Decision Not To Review an... public record for this investigation may be viewed on the Commission's electronic docket (EDIS) at...

  15. PRODUCTION OF HYDRATED ELECTRONS FROM PHOTOIONIZATION OF DISSOLVED ORGANIC MATTER IN NATURAL WATERS

    EPA Science Inventory

    Under UV irradiation, an important primary photochemical reaction of colored dissolved organic matter (CDOM) is electron ejection, producing hydrated electrons (e-aq). The efficiency of this process has been studied in both fresh and seawater samples with both steady-state scave...

  16. 76 FR 16462 - In the Matter of Heli Electronics Corp., Order of Suspension of Trading

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-03-23

    ... From the Federal Register Online via the Government Publishing Office SECURITIES AND EXCHANGE COMMISSION In the Matter of Heli Electronics Corp., Order of Suspension of Trading March 21, 2011. It appears... concerning the securities of Heli Electronics Corp. (``HELI''), a Nevada corporation with headquarters...

  17. Experiential Learning of Electronics Subject Matter in Middle School Robotics Courses

    ERIC Educational Resources Information Center

    Rihtaršic, David; Avsec, Stanislav; Kocijancic, Slavko

    2016-01-01

    The purpose of this paper is to investigate whether the experiential learning of electronics subject matter is effective in the middle school open learning of robotics. Electronics is often ignored in robotics courses. Since robotics courses are typically comprised of computer-related subjects, and mechanical and electrical engineering, these…

  18. Linking the gaseous and the condensed phases of matter: The slow electron and its interactions

    SciTech Connect

    Christophorou, L.G.

    1993-12-31

    The interfacing of the gaseous and the condensed phases of matter as effected by interphase and cluster studies on the behavior of key reactions involving slow electrons either as reacting initial particles or as products of the reactions themselves is discussed. Emphasis is placed on the measurement of both the cross sections and the energetics involved, although most of the available information to date is on the latter. The discussion is selectively focussed on electron scattering (especially the role of negative ion states in gases, clusters, and dense matter), ionization, electron attachment and photodetachment. The dominant role of the electric polarization of the medium is emphasized.

  19. Condensed-matter physics: Vibrations mapped by an electron beam

    NASA Astrophysics Data System (ADS)

    Colliex, Christian

    2017-03-01

    The vibrational excitations of nanostructures have been mapped using state-of-the-art electron microscopy. The results improve our understanding of these excitations, which will aid the design of nanostructures. See Letter p.529

  20. The Cold Dark Matter Search test stand warm electronics card

    SciTech Connect

    Hines, Bruce; Hansen, Sten; Huber, Martin; Kiper, Terry; Rau, Wolfgang; Saab, Tarek; Seitz, Dennis; Sundqvist, Kyle; Mandic, Vuk; /Minnesota U.

    2010-11-01

    A card which does the signal processing for four SQUID amplifiers and two charge sensitive channels is described. The card performs the same functions as is presently done with two custom 9U x 280mm Eurocard modules, a commercial multi-channel VME digitizer, a PCI to GPIB interface, a PCI to VME interface and a custom built linear power supply. By integrating these functions onto a single card and using the power over Ethernet standard, the infrastructure requirements for instrumenting a Cold Dark Matter Search (CDMS) detector test stand are significantly reduced.

  1. Natural organic matter as electron acceptor: experimental evidence for its important role in anaerobic respiration

    NASA Astrophysics Data System (ADS)

    Lau, Maximilian Peter; Sander, Michael; Gelbrecht, Jörg; Hupfer, Michael

    2014-05-01

    Microbial respiration is a key driver of element cycling in oxic and anoxic environments. Upon depletion of oxygen as terminal electron acceptor (TEA), a number of anaerobic bacteria can employ alternative TEA for intracellular energy generation. Redox active quinone moieties in dissolved organic matter (DOM) are well known electron acceptors for microbial respiration. However, it remains unclear whether quinones in adsorbed and particulate OM accept electrons in a same way. In our studies we aim to understand the importance of natural organic matter (NOM) as electron acceptors for microbial energy gain and its possible implications for methanogenesis. Using a novel electrochemical approach, mediated electrochemical reduction and -oxidation, we can directly quantify reduced hydroquinone and oxidized quionone moieties in dissolved and particulate NOM samples. In a mesocosm experiment, we rewetted sediment and peat soil and followed electron transfer to the inorganic and organic electron acceptors over time. We found that inorganic and organic electron acceptor pools were depleted over the same timescales. More importantly, we showed that organic, NOM-associated electron accepting moieties represent as much as 21 40% of total TEA inventories. These findings support earlier studies that propose that the reduction of quinone moieties in particulate organic matter competitively suppresses methanogenesis in wetland soils. Our results indicate that electron transfer to organic, particulate TEA in inundated ecosystems has to be accounted for when establishing carbon budgets in and projecting greenhouse gas emissions from these systems.

  2. Electron microscopy of carbonaceous matter in Allende acid residues

    NASA Technical Reports Server (NTRS)

    Lumpkin, G. R.

    1982-01-01

    On the basis of characteristic diffuse ring diffraction patterns, much of the carbonaceous matter in a large suite of Allende acid residues has been identified as a variety of turbostratic carbon. Crystallites of this phase contain randomly stacked sp(2) hybridized carbon layers and diffraction patterns resemble those from carbon black and glassy carbon. Carbynes are probably absent, and are certainly restricted to less than 0.5% of these acid residues. The work of Ott et al. (1981) provides a basis for the possibility that turbostratic carbon is a carrier of noble gases, but an additional component - amorphous carbon - may be necessary to explain the high release temperatures of noble gases as well as the glassy character of many of the carbonaceous particles. Carbynes are considered to be questionable as important carriers of noble gases in the Allende acid residues.

  3. Research and design of the electronics system for the underground dark matter detection experiment in IHEP

    NASA Astrophysics Data System (ADS)

    Jun, H.; Xiaoshan, J.; Jie, Z.; Wei, W.; Gang, L.

    2015-03-01

    The underground dark matter experiment in IHEP searches for direct detection of dark matter using CsI(Na) as detector material. Rare nuclear recoil events of dark matter particles scattering off the target material will be detected by photomultiplier tubes (PMTs). This paper describes the electronics system structure we chose for this detector. It focuses on the design of the main modules, the high-speed ADC module and the 2-level data acquisition module. Some performance results are presented at the end.

  4. Prospects for using X-ray free-electron lasers to investigate shock-compressed matter

    SciTech Connect

    Nagler, Bob; Higginbotham, Andrew; Kimminau, Giles; Murphy, William; Whitcher, Thomas; Wark, Justin; Hawreliak, James; Kalantar, Dan; Lee, Richard; Lorenzana, Hector; Remington, Bruce; Larsson, Jorgen; Park, Nigel; Sokolowski-Tinten, Klaus

    2007-12-12

    Within the next few years hard X-ray Free Electron Lasers will come on line. Such systems will have spectral brightnesses ten orders of magnitude greater than any extant synchrotron, with pulse lengths as short as a few femtoseconds. It is anticipated that large-scale optical lasers capable of shock-compressing matter to multi-megabar pressures will be sited alongside the X-ray source. We discuss how such systems can further our knowledge of shocked and isochorically heated matter, in particular investigating the potential to perform polycrystalline diffraction and the creation of warm dense matter.

  5. Reciprocity in the electronic stopping of slow ions in matter

    NASA Astrophysics Data System (ADS)

    Sigmund, P.

    2008-04-01

    The principle of reciprocity, i.e., the invariance of the inelastic excitation in ion-atom collisions against interchange of projectile and target, has been applied to the electronic stopping cross section of low-velocity ions and tested empirically on ion-target combinations supported by a more or less adequate amount of experimental data. Reciprocity is well obeyed (within ~10%) for many systems studied, and deviations exceeding ~20% are exceptional. Systematic deviations such as gas-solid or metal-insulator differences have been looked for but not identified on the present basis. A direct consequence of reciprocity is the equivalence of Z1 with Z2 structure for random slowing down. This feature is reasonably well supported empirically for ion-target combinations involving carbon, nitrogen, aluminium and argon. Reciprocity may be utilized as a criterion to reject questionable experimental data. In cases where a certain stopping cross section has not been or cannot be measured, the stopping cross section for the inverted system may be available and serve as a first estimate. It is suggested to build in reciprocity as a fundamental requirement into empirical interpolation schemes directed at the stopping of low-velocity ions. Examination of the SRIM and MSTAR codes reveals cases where reciprocity is obeyed accurately, but deviations of up to a factor of two are common. In case of heavy ions such as gold, electronic stopping cross sections predicted by SRIM are asserted to be almost an order of magnitude too high.

  6. The electronics and data acquisition system for the PandaX-I dark matter experiment

    NASA Astrophysics Data System (ADS)

    Ren, X.; Chen, X.; Ji, X.; Li, S.; Lei, S.; Liu, J.; Wang, M.; Xiao, M.; Xie, P.; Yan, B.

    2016-04-01

    We describe the electronics and data acquisition system used in the first phase of the PandaX experiment—a 120 kg dual-phase liquid xenon dark matter direct detection experiment in the China Jin-Ping Underground Laboratory. This system utilized 180 channels of commercial flash ADC waveform digitizers. During the entire experimental run, the system has achieved low trigger threshold (<1 keV electron-equivalent energy) and low deadtime data acquisition.

  7. Atomic-scale diffractive imaging of sub-cycle electron dynamics in condensed matter

    DOE PAGES

    Yakovlev, Vladislav S.; Stockman, Mark I.; Krausz, Ferenc; ...

    2015-09-28

    For interaction of light with condensed-matter systems, we show with simulations that ultrafast electron and X-ray diffraction can provide a time-dependent record of charge-density maps with sub-cycle and atomic-scale resolutions. Using graphene as an example material, we predict that diffraction can reveal localised atomic-scale origins of optical and electronic phenomena. Here, we point out nontrivial relations between microscopic electric current and density in undoped graphene.

  8. Atomic-scale diffractive imaging of sub-cycle electron dynamics in condensed matter

    PubMed Central

    Yakovlev, Vladislav S.; Stockman, Mark I.; Krausz, Ferenc; Baum, Peter

    2015-01-01

    For interaction of light with condensed-matter systems, we show with simulations that ultrafast electron and X-ray diffraction can provide a time-dependent record of charge-density maps with sub-cycle and atomic-scale resolutions. Using graphene as an example material, we predict that diffraction can reveal localised atomic-scale origins of optical and electronic phenomena. In particular, we point out nontrivial relations between microscopic electric current and density in undoped graphene. PMID:26412407

  9. Low energy electron/recoil discrimination for directional Dark Matter detection

    SciTech Connect

    Billard, J.; Mayet, F.; Santos, D. E-mail: mayet@lpsc.in2p3.fr

    2012-07-01

    Directional detection is a promising Dark Matter search strategy. Even though it could accommodate to a sizeable background contamination, electron/recoil discrimination remains a key and challenging issue as for direction-insensitive detectors. The measurement of the 3D track may be used to discriminate electrons from nuclear recoils. While a high rejection power is expected above 20 keV ionization, a dedicated data analysis is needed at low energy. After identifying discriminant observables, a multivariate analysis, namely a Boosted Decision Tree, is proposed, enabling an efficient event tagging for Dark Matter search. We show that it allows us to optimize rejection while keeping a rather high efficiency which is compulsory for rare event search.With respect to a sequential analysis, the rejection is about ∼ 20 times higher with a multivariate analysis, for the same Dark Matter exclusion limit.

  10. Ion potential in warm dense matter: wake effects due to streaming degenerate electrons.

    PubMed

    Moldabekov, Zhandos; Ludwig, Patrick; Bonitz, Michael; Ramazanov, Tlekkabul

    2015-02-01

    The effective dynamically screened potential of a classical ion in a stationary flowing quantum plasma at finite temperature is investigated. This is a key quantity for thermodynamics and transport of dense plasmas in the warm-dense-matter regime. This potential has been studied before within hydrodynamic approaches or based on the zero temperature Lindhard dielectric function. Here we extend the kinetic analysis by including the effects of finite temperature and of collisions based on the Mermin dielectric function. The resulting ion potential exhibits an oscillatory structure with attractive minima (wakes) and, thus, strongly deviates from the static Yukawa potential of equilibrium plasmas. This potential is analyzed in detail for high-density plasmas with values of the Brueckner parameter in the range 0.1≤r(s)≤1 for a broad range of plasma temperature and electron streaming velocity. It is shown that wake effects become weaker with increasing temperature of the electrons. Finally, we obtain the minimal electron streaming velocity for which attraction between ions occurs. This velocity turns out to be less than the electron Fermi velocity. Our results allow for reliable predictions of the strength of wake effects in nonequilibrium quantum plasmas with fast streaming electrons showing that these effects are crucial for transport under warm-dense-matter conditions, in particular for laser-matter interaction, electron-ion temperature equilibration, and stopping power.

  11. Evolution of Medication Administration Workflow in Implementing Electronic Health Record System

    ERIC Educational Resources Information Center

    Huang, Yuan-Han

    2013-01-01

    This study focused on the clinical workflow evolutions when implementing the health information technology (HIT). The study especially emphasized on administrating medication when the electronic health record (EHR) systems were adopted at rural healthcare facilities. Mixed-mode research methods, such as survey, observation, and focus group, were…

  12. Optimizing the electronic health record to standardize administration and documentation of nutritional supplements.

    PubMed

    Citty, Sandra W; Kamel, Amir; Garvan, Cynthia; Marlowe, Lee; Westhoff, Lynn

    2017-01-01

    Malnutrition in hospitalized patients is a major cause for hospital re-admission, pressure ulcers and increased hospital costs. Methods to improve the administration and documentation of nutritional supplements for hospitalized patients are needed to improve patient care, outcomes and resource utilization. Staff at a medium-sized academic health science center hospital in the southeastern United States noted that nutritional supplements ordered for patients at high risk for malnutrition were not offered or administered to patients in a standardized manner and/or not documented clearly in the electronic health record as per prescription. This paper reports on a process improvement project that redesigned the ordering, administration and documentation process of oral nutritional supplements in the electronic health record. By adding nutritional products to the medication order sets and adding an electronic nutrition administration record (ENAR) tab, the multidisciplinary team sought to standardize nutritional supplement ordering, documentation and administration at prescribed intervals. This process improvement project used a triangulated approach to evaluating pre- and post-process change including: medical record reviews, patient interviews, and nutrition formula room log reports. Staff education and training was carried out prior to initiation of the system changes. This process change resulted in an average decrease in the return of unused nutritional formula from 76% returned at baseline to 54% post-process change. The process change resulted in 100% of nutritional supplement orders having documentation about nutritional medication administration and/or reason for non-administration. Documentation in the ENAR showed that 41% of ONS orders were given and 59% were not given. Significantly more patients reported being offered the ONS product (p=0.0001) after process redesign and more patients (5% before ENAR and 86% after ENAR reported being offered the correct

  13. Optimizing the electronic health record to standardize administration and documentation of nutritional supplements

    PubMed Central

    Citty, Sandra W.; Kamel, Amir; Garvan, Cynthia; Marlowe, Lee; Westhoff, Lynn

    2017-01-01

    Malnutrition in hospitalized patients is a major cause for hospital re-admission, pressure ulcers and increased hospital costs. Methods to improve the administration and documentation of nutritional supplements for hospitalized patients are needed to improve patient care, outcomes and resource utilization. Staff at a medium-sized academic health science center hospital in the southeastern United States noted that nutritional supplements ordered for patients at high risk for malnutrition were not offered or administered to patients in a standardized manner and/or not documented clearly in the electronic health record as per prescription. This paper reports on a process improvement project that redesigned the ordering, administration and documentation process of oral nutritional supplements in the electronic health record. By adding nutritional products to the medication order sets and adding an electronic nutrition administration record (ENAR) tab, the multidisciplinary team sought to standardize nutritional supplement ordering, documentation and administration at prescribed intervals. This process improvement project used a triangulated approach to evaluating pre- and post-process change including: medical record reviews, patient interviews, and nutrition formula room log reports. Staff education and training was carried out prior to initiation of the system changes. This process change resulted in an average decrease in the return of unused nutritional formula from 76% returned at baseline to 54% post-process change. The process change resulted in 100% of nutritional supplement orders having documentation about nutritional medication administration and/or reason for non-administration. Documentation in the ENAR showed that 41% of ONS orders were given and 59% were not given. Significantly more patients reported being offered the ONS product (p=0.0001) after process redesign and more patients (5% before ENAR and 86% after ENAR reported being offered the correct

  14. The Electron Recoil Response of the XENON1T Dark Matter Experiment

    NASA Astrophysics Data System (ADS)

    Shockley, Evan; Xenon1T Collaboration

    2017-01-01

    XENON1T employs a two-phase xenon TPC to search for dark matter by detecting scintillation light produced by nuclear recoils in a 2 ton active volume of liquid xenon. However, nuclear recoils are not the only recoils that can occur since radiogenic electronic recoils are possible. Our only way of differentiating nuclear and electronic recoils is by comparing the relative fraction of scintillation (S1) and ionization (S2) signals. For the first Science Run of XENON1T, we must understand the response of our detector to S1 and S2 signals at the low keV energies where dark matter will present itself. Therefore, I will be discussing the current understanding of our signal and detection mechanisms at these energies. This work includes work using sources such as the Rn220 technique developed by XENON collaborators for understanding our rejection of electronic recoils.

  15. Few-Electron Ultrastrong Light-Matter Coupling in a Quantum LC Circuit

    NASA Astrophysics Data System (ADS)

    Todorov, Yanko; Sirtori, Carlo

    2014-10-01

    The phenomenon of ultrastrong light-matter interaction of a two-dimensional electron gas within a lumped element electronic circuit resonator is explored. The gas is coupled through the oscillating electric field of the capacitor, and in the limit of very small capacitor volumes, the total number of electrons of the system can be reduced to only a few. One of the peculiar features of our quantum mechanical system is that its Hamiltonian evolves from the fermionic Rabi model to the bosonic Hopfield model for light-matter coupling as the number of electrons is increased. We show that the Dicke states, introduced to describe the atomic super-radiance, are the natural base to describe the crossover between the two models. Furthermore, we illustrate how the ultrastrong coupling regime in the system and the associated antiresonant terms of the quantum Hamiltonian have a fundamentally different impact in the fermionic and bosonic cases. In the intermediate regime, our system behaves like a multilevel quantum bit with nonharmonic energy spacing, owing to the particle-particle interactions. Such a system can be inserted into a technological semiconductor platform, thus opening interesting perspectives for electronic devices where the readout of quantum electrodynamical properties is obtained via the measure of a DC current.

  16. Public Administration: What is It, Why Teach It and Does It Matter?

    ERIC Educational Resources Information Center

    Fenwick, John; McMillan, Janice

    2014-01-01

    What is understood by "public administration" in the contemporary UK higher education setting? Is it still being taught and, if so, why? These questions initially appear to be fairly straightforward but any review of the topic quickly poses some rather more tricky areas of enquiry. This article will focus upon three central questions.…

  17. Chronic cocaine administration causes extensive white matter damage in brain: diffusion tensor imaging and immunohistochemistry studies.

    PubMed

    Narayana, Ponnada A; Herrera, Juan J; Bockhorst, Kurt H; Esparza-Coss, Emilio; Xia, Ying; Steinberg, Joel L; Moeller, F Gerard

    2014-03-30

    The effect of chronic cocaine exposure on multiple white matter structures in rodent brain was examined using diffusion tensor imaging (DTI), locomotor behavior, and end point histology. The animals received either cocaine at a dose of 100mg/kg (N=19), or saline (N=17) for 28 days through an implanted osmotic minipump. The animals underwent serial DTI scans, locomotor assessment, and end point histology for determining the expressions of myelin basic protein (MBP), neurofilament-heavy protein (NF-H), proteolipid protein (PLP), Nogo-A, aquaporin-4 (AQP-4), and growth associated protein-43 (GAP-43). Differences in the DTI measures were observed in the splenium (scc) and genu (gcc) of the corpus callosum (cc), fimbria (fi), and the internal capsule (ic). A significant increase in the activity in the fine motor movements and a significant decrease in the number of rearing events were observed in the cocaine-treated animals. Reduced MBP and Nogo-A and increased GAP-43 expressions were most consistently observed in these structures. A decrease in the NF-H expression was observed in fi and ic. The reduced expression of Nogo-A and the increased expression of GAP-43 may suggest destabilization of axonal connectivity and increased neurite growth with aberrant connections. Increased GAP-43 suggests drug-induced plasticity or a possible repair mechanism response. The findings indicated that multiple white matter tracts are affected following chronic cocaine exposure.

  18. Chronic Cocaine Administration Causes Extensive White Matter Damage in Brain: Diffusion Tensor Imaging and Immunohistochemistry Studies

    PubMed Central

    Narayana, Ponnada A.; Herrera, Juan J.; Bockhorst, Kurt H; Esparza-Coss, Emilio; Xia, Ying; Steinberg, Joel L.; Moeller, F. Gerard

    2014-01-01

    The effect of chronic cocaine exposure on multiple white matter structures in rodent brain was examined using diffusion tensor imaging (DTI), locomotor behavior, and end point histology. The animals received either cocaine at a dose of 100 mg/kg (N=19), or saline (N=17) for 28 days through an implanted osmotic minipump. The animals underwent serial DTI scans, locomotor assessment, and end point histology for determining the expressions of myelin basic protein (MBP), neurofilament-heavy protein (NF-H), proteolipid protein (PLP), Nogo-A, aquaporin-4 (AQP-4), and growth associated protein – 43 (GAP-43). Differences in the DTI measures were observed in the splenium (scc) and genu (gcc) of the corpus callosum (cc), fimbria (fi), and the internal capsule (ic). Significant increase in the activity in the fine motor movements and decrease in the number of rearing events were observed in the cocaine treated animals. Reduced MBP and Nogo-A, and increased GAP-43 expressions were most consistently observed in these structures. A decrease in the NF-H expression was observed in fi and ic. The reduced expression of Nogo-A and increased GAP-43 may suggest destabilization of axonal connectivity and increased neurite growth with aberrant connections. Increased GAP-43 suggests drug induced plasticity or a possible repair mechanism response. The findings indicated that multiple white matter tracts are affected following chronic cocaine exposure. PMID:24507117

  19. 76 FR 40930 - In the Matter of Certain Electronic Devices, Including Mobile Phones, Portable Music Players, and...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-07-12

    ... COMMISSION In the Matter of Certain Electronic Devices, Including Mobile Phones, Portable Music Players, and... electronic devices, including mobile phones, portable music players, and computers by reason of infringement... this investigation may be viewed on the Commission's electronic docket (EDIS) at...

  20. 76 FR 31983 - In the Matter of Certain Electronic Devices, Including Mobile Phones, Portable Music Players, and...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-06-02

    ... COMMISSION In the Matter of Certain Electronic Devices, Including Mobile Phones, Portable Music Players, and....usitc.gov . The public record for this investigation may be viewed on the Commission's electronic docket... the United States after importation of certain electronic devices, including mobile phones,...

  1. 76 FR 53154 - In the Matter of Certain Electronic Paper Towel Dispensing Devices and Components Thereof; Notice...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-08-25

    ... COMMISSION In the Matter of Certain Electronic Paper Towel Dispensing Devices and Components Thereof; Notice... Section 337 by defaulting respondents in Inv. No. 337-TA- 718, Certain Electronic Paper Towel Dispensing... within the United States after importation of certain electronic paper towel dispensing devices...

  2. 75 FR 28651 - In the Matter of Certain Electronic Paper Towel Dispensing Devices and Components Thereof; Notice...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-05-21

    ... COMMISSION In the Matter of Certain Electronic Paper Towel Dispensing Devices and Components Thereof; Notice... the sale within the United States after importation of certain electronic paper towel dispensing... electronic paper towel dispensing devices or components thereof that infringe one or more of claims 1-7 of...

  3. Restricted Path-Integral Molecular Dynamics for Simulating the Correlated Electron Plasma in Warm Dense Matter

    NASA Astrophysics Data System (ADS)

    Kapila, Vivek; Deymier, Pierre; Runge, Keith

    2011-10-01

    Several areas of study including heavy ion beam, large scale laser, and high pressure or Thomson scattering studies necessitate a fundamental understanding of warm dense matter (WDM) i.e. matter at high temperature and high density. The WDM regime, however, lacks any adequate highly developed class of simulation methods. Recent progress to address this deficit has been the development of orbital-free Density Functional Theory (ofDFT). However, scant benchmark information is available on temperature and pressure dependence of simple but realistic models in WDM regime. The present work aims to fill this critical gap using the restricted path-integral molecular dynamics (rPIMD) method. Within the discrete path integral representation, electrons are described as harmonic necklaces. Quantum exchange takes the form of cross linking between electron necklaces. The fermion sign problem is addressed by restricting the density matrix to positive values. The molecular dynamics algorithm is employed to sample phase space. Here, we focus on the behavior of strongly correlated electron plasmas under WDM conditions. We compute the kinetic and potential energies and compare them to those obtained with the ofDFT method. Several areas of study including heavy ion beam, large scale laser, and high pressure or Thomson scattering studies necessitate a fundamental understanding of warm dense matter (WDM) i.e. matter at high temperature and high density. The WDM regime, however, lacks any adequate highly developed class of simulation methods. Recent progress to address this deficit has been the development of orbital-free Density Functional Theory (ofDFT). However, scant benchmark information is available on temperature and pressure dependence of simple but realistic models in WDM regime. The present work aims to fill this critical gap using the restricted path-integral molecular dynamics (rPIMD) method. Within the discrete path integral representation, electrons are described as

  4. XENON100 Dark Matter Search: Scintillation Response of Liquid Xenon to Electronic Recoils

    NASA Astrophysics Data System (ADS)

    Lim, Kyungeun Elizabeth

    Dark matter is one of the missing pieces necessary to complete the puzzle of the universe. Numerous astrophysical observations at all scales suggest that 23 % of the universe is made of nonluminous, cold, collisionless, nonbaryonic, yet undiscovered dark matter. Weakly Interacting Massive Particles (WIMPs) are the most well-motivated dark matter candidates and significant efforts have been made to search for WIMPs. The XENON100 dark matter experiment is currently the most sensitive experiment in the global race for the first direct detection of WIMP dark matter. XENON100 is a dual-phase (liquid-gas) time projection chamber containing a total of 161 kg of liquid xenon (LXe) with a 62kg WIMP target mass. It has been built with radiopure materials to achieve an ultra-low electromagnetic background and operated at the Laboratori Nazionali del Gran Sasso in Italy. WIMPs are expected to scatter off xenon nuclei in the target volume. Simultaneous measurement of ionization and scintillation produced by nuclear recoils allows for the detection of WIMPs in XENON100. Data from the XENON100 experiment have resulted in the most stringent limits on the spin-independent elastic WIMP-nucleon scattering cross sections for most of the significant WIMP masses. As the experimental precision increases, a better understanding of the scintillation and ionization response of LXe to low energy (< 10 keV) particles is crucial for the interpretation of data from LXe based WIMP searches. A setup has been built and operated at Columbia University to measure the scintillation response of LXe to both electronic and nuclear recoils down to energies of a few keV, in particular for the XENON100 experiment. In this thesis, I present the research carried out in the context of the XENON100 dark matter search experiment. For the theoretical foundation of the XENON100 experiment, the first two chapters are dedicated to the motivation for and detection medium choice of the XENON100 experiment

  5. Electronic polymers and soft-matter-like broken symmetries in underdoped cuprates

    PubMed Central

    Capati, M.; Caprara, S.; Di Castro, C.; Grilli, M.; Seibold, G.; Lorenzana, J.

    2015-01-01

    Empirical evidence in heavy fermion, pnictide and other systems suggests that unconventional superconductivity appears associated to some form of real-space electronic order. For the cuprates, despite several proposals, the emergence of order in the phase diagram between the commensurate antiferromagnetic state and the superconducting state is not well understood. Here we show that in this regime doped holes assemble in ‘electronic polymers'. Within a Monte Carlo study, we find that in clean systems by lowering the temperature the polymer melt condenses first in a smectic state and then in a Wigner crystal both with the addition of inversion symmetry breaking. Disorder blurs the positional order leaving a robust inversion symmetry breaking and a nematic order, accompanied by vector chiral spin order and with the persistence of a thermodynamic transition. Such electronic phases, whose properties are reminiscent of soft-matter physics, produce charge and spin responses in good accord with experiments. PMID:26144868

  6. Using linked electronic data to validate algorithms for health outcomes in administrative databases.

    PubMed

    Lee, Wan-Ju; Lee, Todd A; Pickard, Alan Simon; Shoaibi, Azadeh; Schumock, Glen T

    2015-08-01

    The validity of algorithms used to identify health outcomes in claims-based and administrative data is critical to the reliability of findings from observational studies. The traditional approach to algorithm validation, using medical charts, is expensive and time-consuming. An alternative method is to link the claims data to an external, electronic data source that contains information allowing confirmation of the event of interest. In this paper, we describe this external linkage validation method and delineate important considerations to assess the feasibility and appropriateness of validating health outcomes using this approach. This framework can help investigators decide whether to pursue an external linkage validation method for identifying health outcomes in administrative/claims data.

  7. Enhanced Dark Matter Annihilation Rate for Positron and Electron Excesses from Q-Ball Decay

    SciTech Connect

    McDonald, John

    2009-10-09

    We show that Q-ball decay in Affleck-Dine baryogenesis models can account for dark matter when the annihilation cross section is sufficiently enhanced to explain the positron and electron excesses observed by PAMELA, ATIC, and PPB-BETS. For Affleck-Dine baryogenesis along a d=6 flat direction, the reheating temperature is approximately 30 GeV and the Q-ball decay temperature is in the range of 10-100 MeV. The lightest supersymmetric particles produced by Q-ball decay annihilate down to the observed dark matter density if the cross section is enhanced by a factor approx10{sup 3} relative to the thermal relic cross section.

  8. Electron matter optics of the Aharonov-Bohm and Stern-Gerlach effects

    NASA Astrophysics Data System (ADS)

    McGregor, Scot Cameron

    Since the advent of quantum mechanics and the idea that massive particles exhibit wave properties, physicists have made efforts to make use of the short deBroglie wave length of matter waves for fundamental as well as practical studies. Among these are the precise measurements allowed by interference, diffraction, and microscopy as well as the study of more fundamental aspects of quantum theory such as the Aharonov-Bohm effects or the Stern-Gerlach effect, which are described below. However, in order to use matter waves to observe any of these effects it is necessary to produce and maintain coherence in the waves which are used for measurement. With a grasp of what coherence is and how it may be achieved and maintained one can move forward to study the interesting phenomena associated with coherent matter waves. More specifically in this work the interference and diffraction of electron matter waves are considered. The phenomena under consideration are those associated with the interaction of the electric charge and magnetic dipole moment of the electron with external fields and potentials while in the process of interfering or diffracting. Namely the focus of this dissertation is the Aharonov-Bohm effect, the Aharonov-Casher effect, and the Stern-Gerlach effect. Additionally, a wide-angle electron beam-splitter capable of producing two centimeter beam separation at the detection plane is discussed. The beam-splitter utilizes a nanofabricated periodic grating in combination with a bi-prism element. Contrary to devices utilizing only bi-prism elements, the use of the periodic grating causes amplitude, and not wave front, splitting. Even at maximum separation, beam profiles remain undistorted, providing evidence that coherence is intact. This is a step towards the realization of a large area electron interferometer using such a grating bi-prism combination. Such an interferometer could, in principle, be used to test the dispersionless nature of the Aharonov

  9. Matter under extreme conditions probed by a seeded free-electron-laser

    SciTech Connect

    Bencivenga, F.; Principi, E.; Cucini, R.; Danailov, M. B.; Demidovich, A.; D’Amico, F.; Di Fonzo, S.; Gessini, A.; Kurdi, N.; Mahne, N.; Raimondi, L.; Zangrando, M.; Masciovecchio, C.; Giangrisostomi, E.; Battistoni, A.; Svetina, C.; Di Cicco, A.; Gunnella, R.; Hatada, K.; Filipponi, A.; and others

    2015-08-17

    FERMI is the first user dedicated seeded free-electron-laser (FEL) working in the extreme ultraviolet (XUV) and soft x-ray range. The EIS-TIMEX experimental end-station was availabe to external users since from the beginning of the user operation of the facility, in Dicember 2012. EIS-TIMEX has been conceived to exploit the unique properties of the FERMI source to study matter under extreme and metastable thermodynamic conditions. We hereby report on its basic parameters and applications, which includes very low jitter (i.e., high time resolution) pump-probe measurements.

  10. Dynamic electron correlation in interactions of light with matter formulated in b ⃗ space

    NASA Astrophysics Data System (ADS)

    Kaplan, Lev; McGuire, J. H.

    2015-09-01

    Scattering of beams of light and matter from multielectron atomic targets is formulated in the position representation of quantum mechanics. This yields expressions for the probability amplitude a (b ⃗) for a wide variety of processes. Here the spatial parameter b ⃗ is the distance of closest approach of incoming particles traveling on a straight line with the center of the atomic target. The correlated probability amplitude a (b ⃗) reduces to a relatively simple product of single-electron probability amplitudes in the widely used independent electron approximation limit, where the correlation effects of the Coulomb interactions between the atomic electrons disappear. As an example in which a (b ⃗) has an explicit dependence on b ⃗, we consider transversely finite vortex beams of twisted photons that lack the translational invariance of infinite plane-wave beams. Relatively simple calculations, illustrating the b ⃗ dependence in transition probabilities for photon beams interacting with a two-state degenerate single-electron atomic target, are included. Further application for many-electron systems is discussed. Possible practical uses are briefly considered.

  11. Interplay of electron heating and saturable absorption in ultrafast extreme ultraviolet transmission of condensed matter

    NASA Astrophysics Data System (ADS)

    Di Cicco, Andrea; Hatada, Keisuke; Giangrisostomi, Erika; Gunnella, Roberto; Bencivenga, Filippo; Principi, Emiliano; Masciovecchio, Claudio; Filipponi, Adriano

    2014-12-01

    High intensity pulses obtained by modern extreme ultraviolet (EUV) and x-ray photon sources allows the observation of peculiar phenomena in condensed matter. Experiments performed at the Fermi@Elettra FEL-1 free-electron-laser source at 23.7, 33.5, and 37.5 eV on Al thin films, for an intermediate-fluence range up to about 20 J /cm2, show evidence for a nonmonotonic EUV transmission trend. A decreasing transmission up to about 5 -10 J /cm2 is followed by an increase at higher fluence, associated with saturable absorption effects. The present findings are interpreted within a simplified three-channel model, showing that an account of the interplay between ultrafast electron heating and saturation effects is required to explain the observed transmission trend.

  12. Conducting research using the electronic health record across multi-hospital systems: semantic harmonization implications for administrators.

    PubMed

    Bowles, Kathryn H; Potashnik, Sheryl; Ratcliffe, Sarah J; Rosenberg, Melissa; Shih, Nai-Wei; Topaz, Maxim; Holmes, John H; Naylor, Mary D

    2013-06-01

    Administrators play a major role in choosing and managing the use of the electronic health record (EHR). The documentation policies and EHR changes enacted or approved by administrators affect the ability to use clinical data for research. This article illustrates the challenges that can be avoided through awareness of the consequences of customization, variations in documentation policies and quality, and user interface features. Solutions are posed that assist administrators in avoiding these challenges and promoting data harmonization for research and quality improvement.

  13. 76 FR 32373 - In the Matter of Certain Electronic Devices Having a Digital Television Receiver and Components...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-06-06

    ... COMMISSION In the Matter of Certain Electronic Devices Having a Digital Television Receiver and Components... Act of 1930, as amended, 19 U.S.C. 1337, on behalf of Zenith Electronics LLC of Lincolnshire, Illinois... devices having a digital television receiver and components thereof by reason of infringement of...

  14. 75 FR 8115 - In the Matter of Certain Electronic Devices Having Image Capture or Display Functionality and...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-02-23

    ... From the Federal Register Online via the Government Publishing Office INTERNATIONAL TRADE COMMISSION In the Matter of Certain Electronic Devices Having Image Capture or Display Functionality and... sale within the United States after importation of certain electronic devices having image capture...

  15. 75 FR 34484 - In the Matter of: Certain Portable Electronic Devices and Related Software; Notice of Investigation

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-06-17

    ... COMMISSION In the Matter of: Certain Portable Electronic Devices and Related Software; Notice of... and related software by reason of infringement of certain claims of U.S. Patent Nos. 6,999,800; 5,541... certain portable electronic devices or related software that infringe one or more of claims 1-4, 6, 10,...

  16. Free-electron laser measurements of plasmons in warm dense matter

    NASA Astrophysics Data System (ADS)

    Gamboa, Eliseo

    2014-10-01

    Strong plasmon resonances characteristic of electron density fluctuations in warm dense matter (WDM) plasmas have recently been observed for the first time at the Linac Coherent Light Source (LCLS). These experiments record forward scattering from ultrabright 8 keV x-ray pulses to probe dynamically compressed solids driven by shaped ns laser pulses at the Matter in Extreme Conditions (MEC) instrument. From the x-ray scattering spectra we observe well-pronounced plasmon peaks that directly access the electron densities and temperatures. We can access densities >5 g/cm3 and pressures approaching 5 Mbar that are important for planetary and material science as well as inertial confinement fusion research. In this talk we characterize the plasmon loss against wavenumber-resolved x-ray scattering that provides an independent density measurement through shifted Bragg and ion-ion correlation scattering features. We will compare ideal plasma states achieved in heated aluminum with those measured from uncompressed and compressed CVD diamond. The latter shows plasmon energies strongly affected by the band structure up to the highest experimental pressures of several Mbar. This method is presently being applied in numerous experiments to characterize the physical properties of dense plasmas. We will describe the first demonstration of this technique at LCLS, present applications to characterize shocks in dense plasmas, and discuss novel ideas for measuring the properties of high-pressure materials.

  17. Investigations on the usefulness of the Massively Parallel Processor for study of electronic properties of atomic and condensed matter systems

    NASA Technical Reports Server (NTRS)

    Das, T. P.

    1988-01-01

    The usefulness of the Massively Parallel Processor (MPP) for investigation of electronic structures and hyperfine properties of atomic and condensed matter systems was explored. The major effort was directed towards the preparation of algorithms for parallelization of the computational procedure being used on serial computers for electronic structure calculations in condensed matter systems. Detailed descriptions of investigations and results are reported, including MPP adaptation of self-consistent charge extended Hueckel (SCCEH) procedure, MPP adaptation of the first-principles Hartree-Fock cluster procedure for electronic structures of large molecules and solid state systems, and MPP adaptation of the many-body procedure for atomic systems.

  18. Electron microscopic study of soot particulate matter emissions from aircraft turbine engines.

    PubMed

    Liati, Anthi; Brem, Benjamin T; Durdina, Lukas; Vögtli, Melanie; Dasilva, Yadira Arroyo Rojas; Eggenschwiler, Panayotis Dimopoulos; Wang, Jing

    2014-09-16

    The microscopic characteristics of soot particulate matter (PM) in gas turbine exhaust are critical for an accurate assessment of the potential impacts of the aviation industry on the environment and human health. The morphology and internal structure of soot particles emitted from a CFM 56-7B26/3 turbofan engine were analyzed in an electron microscopic study, down to the nanoscale, for ∼ 100%, ∼ 65%, and ∼ 7% static engine thrust as a proxy for takeoff, cruising, and taxiing, respectively. Sampling was performed directly on transmission electron microscopy (TEM) grids with a state-of-the-art sampling system designed for nonvolatile particulate matter. The electron microscopy results reveal that ∼ 100% thrust produces the highest amount of soot, the highest soot particle volume, and the largest and most crystalline primary soot particles with the lowest oxidative reactivity. The opposite is the case for soot produced during taxiing, where primary soot particles are smallest and most reactive and the soot amount and volume are lowest. The microscopic characteristics of cruising condition soot resemble the ones of the ∼ 100% thrust conditions, but they are more moderate. Real time online measurements of number and mass concentration show also a clear correlation with engine thrust level, comparable with the TEM study. The results of the present work, in particular the small size of primary soot particles present in the exhaust (modes of 24, 20, and 13 nm in diameter for ∼ 100%, ∼ 65% and ∼ 7% engine thrust, respectively) could be a concern for human health and the environment and merit further study. This work further emphasizes the significance of the detailed morphological characteristics of soot for assessing environmental impacts.

  19. Usability Evaluation of An Electronic Medication Administration Record (eMAR) Application

    PubMed Central

    Guo, J.; Iribarren, S.; Kapsandoy, S.; Perri, S.; Staggers, N.

    2011-01-01

    Background Electronic medication administration records (eMARs) have been widely used in recent years. However, formal usability evaluations are not yet available for these vendor applications, especially from the perspective of nurses, the largest group of eMAR users. Objective To conduct a formal usability evaluation of an implemented eMAR. Methods Four evaluators examined a commercial vendor eMAR using heuristic evaluation techniques. The evaluators defined seven tasks typical of eMAR use and independently evaluated the application. Consensus techniques were used to obtain 100% agreement of identified usability problems and severity ratings. Findings were reviewed with 5 clinical staff nurses and the Director of Clinical Informatics who verified findings with a small group of clinical nurses. Results Evaluators found 60 usability problems categorized into 233 heuristic violations. Match, Error, and Visibility heuristics were the most frequently violated. Administer Medication and Order and Modify Medications tasks had the highest number of heuristic violations and usability problems rated as major or catastrophic. Conclusion The high number of usability problems could impact the effectiveness, efficiency and satisfaction of nurses’ medication administration activities and may include concerns about patient safety. Usability is a joint responsibility between sites and vendors. We offer a call to action for usability evaluations at all sites and eMAR application redesign as necessary to improve the user experience and promote patient safety. PMID:23616871

  20. Design and implementation of web-based mobile electronic medication administration record.

    PubMed

    Hsieh, Sung-Huai; Hou, I-Ching; Cheng, Po-Hsun; Tan, Ching-Ting; Shen, Po-Chao; Hsu, Kai-Ping; Hsieh, Sheau-Ling; Lai, Feipei

    2010-10-01

    Patients' safety is the most essential, critical issue, however, errors can hardly prevent, especially for human faults. In order to reduce the errors caused by human, we construct Electronic Health Records (EHR) in the Health Information System (HIS) to facilitate patients' safety and to improve the quality of medical care. During the medical care processing, all the tasks are based upon physicians' orders. In National Taiwan University Hospital (NTUH), the Electronic Health Record committee proposed a standard of order flows. There are objectives of the standard: first, to enhance medical procedures and enforce hospital policies; secondly, to improve the quality of medical care; third, to collect sufficient, adequate data for EHR in the near future. Among the proposed procedures, NTUH decides to establish a web-based mobile electronic medication administration record (ME-MAR) system. The system, build based on the service-oriented architecture (SOA) as well as embedded the HL7/XML standard, is installed in the Mobile Nursing Carts. It also implement accompany with the advanced techniques like Asynchronous JavaScript and XML (Ajax) or Web services to enhance the system usability. According to researches, it indicates that medication errors are highly proportion to total medical faults. Therefore, we expect the ME-MAR system can reduce medication errors. In addition, we evaluate ME-MAR can assist nurses or healthcare practitioners to administer, manage medication properly. This successful experience of developing the NTUH ME-MAR system can be easily applied to other related system. Meanwhile, the SOA architecture of the system can also be seamless integrated to NTUH or other HIS system.

  1. Using Betatron Emissions from Laser Wakefield Accelerated Electrons to Probe Ultra-fast Warm Dense Matter

    NASA Astrophysics Data System (ADS)

    Kotick, Jordan; Schumaker, Will; Condamine, Florian; Albert, Felicie; Barbrel, Benjamin; Galtier, Eric; Granados, Eduardo; Ravasio, Alessandra; Glenzer, Siegfried

    2015-11-01

    Laser wakefield acceleration (LWFA) has been shown to produce short X-ray pulses from betatron oscillations of electrons within the plasma wake. These betatron X-rays pulses have a broad, synchrotron-like energy spectrum and a duration on the order of the driving laser pulse, thereby enabling probing of ultrafast interactions. Using the 1 J, 40fs short-pulse laser at the Matter in Extreme Conditions experimental station at LCLS, we have implemented LWFA to generate and subsequently characterized betatron X-rays. Notch filtering and single photon counting techniques were used to measure the betatron X-ray spectrum while the spatial profile was measured using X-ray CCDs and image plates. We used an ellipsoidal mirror to focus the soft betatron X-rays for pump-probe studies on various targets in conjunction with LCLS X-ray and optical laser pulses. This experimental platform provides the conditions necessary to do a detailed study of warm-dense matter dynamics on the ultrafast time-scale.

  2. The Electronics and Data Acquisition System of the DarkSide Dark Matter Search

    SciTech Connect

    Agnes, P.; et al.

    2014-12-09

    It is generally inferred from astronomical measurements that Dark Matter (DM) comprises approximately 27\\% of the energy-density of the universe. If DM is a subatomic particle, a possible candidate is a Weakly Interacting Massive Particle (WIMP), and the DarkSide-50 (DS) experiment is a direct search for evidence of WIMP-nuclear collisions. DS is located underground at the Laboratori Nazionali del Gran Sasso (LNGS) in Italy, and consists of three active, embedded components; an outer water veto (CTF), a liquid scintillator veto (LSV), and a liquid argon (LAr) time projection chamber (TPC). This paper describes the data acquisition and electronic systems of the DS detectors, designed to detect the residual ionization from such collisions.

  3. Electron microscopic time-lapse visualization of surface pore filtration on particulate matter trapping process.

    PubMed

    Sanui, Ryoko; Hanamura, Katsunori

    2016-09-01

    A scanning electron microscope (SEM) was used to dynamically visualize the particulate matter (PM) trapping process on diesel particulate filter (DPF) walls at a micro scale as 'time-lapse' images corresponding to the increase in pressure drop simultaneously measured through the DPF. This visualization and pressure drop measurement led to the conclusion that the PM trapping in surface pores was driven by PM bridging and stacking at constricted areas in porous channels. This caused a drastic increase in the pressure drop during PM accumulation at the beginning of the PM trapping process. The relationship between the porous structure of the DPF and the depth of the surface pore was investigated in terms of the porosity distribution and PM penetration depth near the wall surface with respect to depth. The pressure drop calculated with an assumed surface pore depth showed a good correspondence to the measured pressure drop.

  4. The impact of a closed‐loop electronic prescribing and administration system on prescribing errors, administration errors and staff time: a before‐and‐after study

    PubMed Central

    Franklin, Bryony Dean; O'Grady, Kara; Donyai, Parastou; Jacklin, Ann; Barber, Nick

    2007-01-01

    Objectives To assess the impact of a closed‐loop electronic prescribing, automated dispensing, barcode patient identification and electronic medication administration record (EMAR) system on prescribing and administration errors, confirmation of patient identity before administration, and staff time. Design, setting and participants Before‐and‐after study in a surgical ward of a teaching hospital, involving patients and staff of that ward. Intervention Closed‐loop electronic prescribing, automated dispensing, barcode patient identification and EMAR system. Main outcome measures Percentage of new medication orders with a prescribing error, percentage of doses with medication administration errors (MAEs) and percentage given without checking patient identity. Time spent prescribing and providing a ward pharmacy service. Nursing time on medication tasks. Results Prescribing errors were identified in 3.8% of 2450 medication orders pre‐intervention and 2.0% of 2353 orders afterwards (p<0.001; χ2 test). MAEs occurred in 7.0% of 1473 non‐intravenous doses pre‐intervention and 4.3% of 1139 afterwards (p = 0.005; χ2 test). Patient identity was not checked for 82.6% of 1344 doses pre‐intervention and 18.9% of 1291 afterwards (p<0.001; χ2 test). Medical staff required 15 s to prescribe a regular inpatient drug pre‐intervention and 39 s afterwards (p = 0.03; t test). Time spent providing a ward pharmacy service increased from 68 min to 98 min each weekday (p = 0.001; t test); 22% of drug charts were unavailable pre‐intervention. Time per drug administration round decreased from 50 min to 40 min (p = 0.006; t test); nursing time on medication tasks outside of drug rounds increased from 21.1% to 28.7% (p = 0.006; χ2 test). Conclusions A closed‐loop electronic prescribing, dispensing and barcode patient identification system reduced prescribing errors and MAEs, and increased confirmation of patient identity before

  5. Electronic Contributions to the Equation-of-State of Warm Dense Matter*

    NASA Astrophysics Data System (ADS)

    Albritton, J. R.; Liberman, D. A.; Sonnad, V.; Young, D. A.; Reisman, D. B.; Cauble, R. C.

    2001-10-01

    We describe calculations with the INFERNO[1] atom-in-jellium model to produce single-shock Hugoniot curves for aluminum, copper, and still other elements, from their normal initial density and also from "expanded" states of initial density of about 1/10 normal. These calculations address the regime of "warm-dense-matter", the former in support of experiments toward maximum compression, and the latter in support of experiments toward isentropic compression. INFERNO provides the electronic contributions to the internal energy and pressure, and ideal-gas or QEOS[2] atomic nuclear contributions complete the scheme. We compare INFERNO’s fully quantum-mechanical treatment of electrons with the familiar Thomas-Fermi model. We also investigate the one-component-plasma[3] model for the non-ideal contributions of atomic ions in strongly-coupled plasmas. [1] D.A. Liberman, Phys Rev B, 20, 4981 (1979) [2] R.M. More, K.H. Warren, D.A. Young, and G.B. Zimmerman, Phys Fluids, 31, 3059 (1988) [3] H. DeWitt, W. Slattery, and Gilles Chabrier, Physica B, 228, 21 (1996) *This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under contract No. W-7405-Eng-48.

  6. Effective atomic numbers, electron densities and kinetic energy released in matter of vitamins for photon interaction

    NASA Astrophysics Data System (ADS)

    Shantappa, A.; Hanagodimath, S. M.

    2014-01-01

    Effective atomic numbers, electron densities of some vitamins (Retinol, Riboflavin, Niacin, Biotin, Folic acid, Cobalamin, Phylloquinone and Flavonoids) composed of C, H, O, N, Co, P and S have been calculated for total and partial photon interactions by the direct method for energy range 1 keV-100 GeV by using WinXCOM and kinetic energy released in matter (Kerma) relative to air is calculated in energy range of 1 keV-20 MeV. Change in effective atomic number and electron density with energy is calculated for all photon interactions. Variation of photon mass attenuation coefficients with energy are shown graphically only for total photon interaction. It is observed that change in mass attenuation coefficient with composition of different chemicals is very large below 100 keV and moderate between 100 keV and 10 MeV and negligible above 10 MeV. Behaviour of vitamins is almost indistinguishable except biotin and cobalamin because of large range of atomic numbers from 1(H) to 16 (S) and 1(H) to 27(Co) respectively. K a value shows a peak due to the photoelectric effect around K-absorption edge of high- Z constituent of compound for biotin and cobalamin.

  7. Atomic ionization due to dark matter scattering on electrons: Implications for DAMA and XENON interpretation

    NASA Astrophysics Data System (ADS)

    Roberts, Benjamin; Stadnik, Yevgeny; Dzuba, Vladimir; Flambaum, Victor; Gribakin, Gleb; Pospelov, Maxim

    2016-05-01

    Atoms can become ionized during the scattering of a particle off a bound electron. Such interactions involving WIMP dark matter are a potential explanation for the anomalous 9 σ annual modulation in the DAMA direct detection experiment 1. Conventional wisdom has it that the amplitude for such a process should be exponentially small. We show, however, that due to nonanalytic, cusp-like behaviour of Coulomb functions close to the nucleus this suppression is removed, leading to an effective atomic structure enhancement. Crucially, we show that due to this behavior, the electron relativistic effects give the dominant contribution to such a process, enhancing the cross section by orders of magnitude 2. Ab initio relativistic calculations are therefore necessary for the proper analysis of such a problem. Therefore, we perform high-accuracy relativistic calculations of atomic ionization. We scan the parameter space: the DM mass, the mediator mass, and the effective coupling strength, to determine if there is any region that could potentially explain the DAMA signal 3.

  8. New constraints for low-momentum electronic excitations in condensed matter: fundamental consequences from classical and quantum dielectric theory.

    PubMed

    Chantler, C T; Bourke, J D

    2015-11-18

    We present new constraints for the transportation behaviour of low-momentum electronic excitations in condensed matter systems, and demonstrate that these have both a fundamental physical interpretation and a significant impact on the description of low-energy inelastic electron scattering. The dispersion behaviour and characteristic lifetime properties of plasmon and single-electron excitations are investigated using popular classical, semi-classical and quantum dielectric models. We find that, irrespective of constrained agreement to the well known high-momentum and high-energy Bethe ridge limit, standard descriptions of low-momentum electron excitations are inconsistent and unphysical. These observations have direct impact on calculations of transport properties such as inelastic mean free paths, stopping powers and escape depths of charged particles in condensed matter systems.

  9. Generation and characterization of warm dense matter isochorically heated by laser-induced relativistic electrons in a wire target

    NASA Astrophysics Data System (ADS)

    Schönlein, A.; Boutoux, G.; Pikuz, S.; Antonelli, L.; Batani, D.; Debayle, A.; Franz, A.; Giuffrida, L.; Honrubia, J. J.; Jacoby, J.; Khaghani, D.; Neumayer, P.; Rosmej, O. N.; Sakaki, T.; Santos, J. J.; Sauteray, A.

    2016-05-01

    We studied the interaction of a high-intensity laser with mass-limited Ti-wires. The laser was focused up to 7× 1020 \\text{W/cm}2 , with contrast of 10-10 to produce relativistic electrons. High-spatial-resolution X-ray spectroscopy was used to measure isochoric heating induced by hot electrons propagating along the wire up to 1 mm depth. For the first time it was possible to distinguish surface target regions heated by mixed plasma mechanisms from those heated only by the hot electrons that generate warm dense matter with temperatures up to 50 eV. Our results are compared to simulations that highlight both the role of electron confinement inside the wire and the importance of resistive stopping powers in warm dense matter.

  10. How Electron Spectroscopy with Synchrotron Light Can Help Us Understand High-Tc Superconductivity and Other Complex States of Matter

    SciTech Connect

    Campuzano, Juan Carlos

    2012-03-07

    All the physical, chemical, and mechanical properties of materials are controlled by electrons that occupy the highest energy levels in solids, those near the Fermi energy. Many techniques were developed to study those electrons, leading to the great successes of condensed matter physics. Newer and complex materials, such as the high-temperature superconductors, tend to exhibit very large anisotropies in their physical properties, requiring a more detailed knowledge of the behavior of electrons not only as a function of their energy, but also their momentum. Angle-resolved photoemission can contribute to our understanding by providing a great deal of information on many of the momentum-dependent properties of electrons and their interactions. In this talk, I will present a brief overview of how a long-term and focused collaboration between scientists at Argonne and other institutions has contributed to making angle-resolved photoemissions a most useful tool in the study of complex states of matter.

  11. Conducting Research Using the Electronic Health Record Across Multi-Hospital Systems: Semantic Harmonization Implications for Administrators

    PubMed Central

    Bowles, Kathryn H.; Potashnik, Sheryl; Ratcliffe, Sarah J.; Rosenberg, Melissa; Shih, Nai-Wei; Topaz, Maxim; Holmes, John H.; Naylor, Mary D.

    2013-01-01

    Administrators play a major role in choosing and managing the use of the electronic health record (EHR). The documentation policies and EHR changes enacted or approved by administrators affect the ability to use clinical data for research. This article illustrates the challenges that can be avoided through awareness of the consequences of customization, variations in documentation policies and quality, and user interface features. Solutions are posed that assist administrators in avoiding these challenges and promoting data harmonization for research and quality improvement. PMID:23708504

  12. Using a Relativistic Electron Beam to Generate Warm Dense Matter for Equation of State Studies

    SciTech Connect

    Berninger, M.

    2011-06-24

    Experimental equation-of-state (EOS) data are difficult to obtain for warm dense matter (WDM)–ionized materials at near-solid densities and temperatures ranging from a few to tens of electron volts–due to the difficulty in preparing suitable plasmas without significant density gradients and transient phenomena. We propose that the Dual Axis Radiographic Hydrodynamic Test (DARHT) facility can be used to create a temporally stationary and spatially uniform WDM. DARHT has an 18 MeV electron beam with 2 kA of current and a programmable pulse length of 20 ns to 200 ns. This poster describes how Monte Carlo n-Particle (MCNP) radiation transport and LASNEX hydrodynamics codes were used to demonstrate that the DARHT beam is favorable for avoiding the problems that have hindered past attempts to constrain WDM properties. In our concept, a 60 ns pulse of electrons is focused onto a small, cylindrical (1 mm diameter × 1 mm long) foam target, which is inside a stiff high-heat capacity tube that both confines the WDM and allows pressure measurements. In our model, the foam is made of 30% density Au and the tamper is a B4C tube. An MCNP model of the DARHT beam investigated electron collisions and the amount of energy deposited in the foam target. The MCNP data became the basis for a LASNEX source model, where the total energy was distributed over a 60 ns time-dependent linear ramp consistent with the DARHT pulse. We used LASNEX to calculate the evolution of the foam EOS properties during and after deposition. Besides indicating that a ~3 eV Au plasma can be achieved, LASNEX models also showed that the WDM generates a shock wave into the tamper whose speed can be measured using photonic Doppler velocimetry. EOS pressures can be identified to better than 10% precision. These pressures can be correlated to energy deposition with electron spectrometry in order to obtain the Au EOS. Radial uniformity in the DARHT beam was also investigated. To further obtain uniform radial

  13. New electron beam-dump experiments to search for MeV to few-GeV dark matter

    NASA Astrophysics Data System (ADS)

    Izaguirre, Eder; Krnjaic, Gordan; Schuster, Philip; Toro, Natalia

    2013-12-01

    In a broad class of consistent models, MeV to few-GeV dark matter interacts with ordinary matter through weakly coupled GeV scale mediators. We show that a suitable meter scale (or smaller) detector situated downstream of an electron beam dump can sensitively probe dark matter interacting via sub-GeV mediators, while B-factory searches cover the 1-5 GeV range. Combined, such experiments explore a well-motivated and otherwise inaccessible region of dark matter parameter space with sensitivity several orders of magnitude beyond existing direct detection constraints. These experiments would also probe invisibly decaying new gauge bosons (“dark photons”) down to kinetic mixing of ɛ˜10-4, including the range of parameters relevant for explaining the (g-2)μ discrepancy. Sensitivity to other long-lived dark sector states and to new millicharge particles would also be improved.

  14. AMS-02 positron excess: New bounds on dark matter models and hint for primary electron spectrum hardening

    NASA Astrophysics Data System (ADS)

    Feng, Lei; Yang, Rui-Zhi; He, Hao-Ning; Dong, Tie-Kuang; Fan, Yi-Zhong; Chang, Jin

    2014-01-01

    The data collected by ATIC, CREAM and PAMELA all display remarkable cosmic ray nuclei spectrum hardening above the magnetic rigidity ∼240 GV. One natural speculation is that the primary electron spectrum also gets hardened (possibly at ∼80 GV) and the hardening partly accounts for the electron/positron total spectrum excess discovered by ATIC, HESS and Fermi-LAT. If it is the case, the increasing behavior of the subsequent positron-to-electron ratio will get flattened and the spectrum hardening should be taken into account in the joint fit of the electron/positron data otherwise the inferred parameters will be biased. Our joint fits of the latest AMS-02 positron fraction data together with the PAMELA/Fermi-LAT electron/positron spectrum data suggest that the primary electron spectrum hardening is needed in most though not all modelings. The bounds on dark matter models have also been investigated. In the presence of spectrum hardening of primary electrons, the amount of dark-matter-originated electron/positron pairs needed in the modeling is smaller. Even with such a modification, the annihilation channel χχ→μ+μ- has been tightly constrained by the Fermi-LAT Galactic diffuse emission data. The decay channel χ→μ+μ- is found to be viable.

  15. Applications of scanning electron microscopy to the study of mineral matter in peat

    SciTech Connect

    Raymond, R. Jr.; Andrejko, M.J.; Bardin, S.W.

    1983-01-01

    Scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS) have been used for in situ analysis of minerals in peats by combining methods for producing oriented microtome sections of peat with methods for critical point drying. The combined technique allows SEM analysis of the inorganic components and their associated botanical constituents, along with petrographic identification of the botanical constituents. In peat deposits with abundant fluvial- or marine-derived minerals, one may use the above technique and/or medium- or low-temperature ashing followed by x-ray diffraction to readily identify the various mineral components. However, in some freshwater environments the scarcity of non-silica minerals makes the above techniques impractical. By separating the inorganic residues from the peat, one can isolate the non-silica mineral matter in the SEM for analysis by EDS. Furthermore, such separation allows SEM analysis of features and textures of both silica and non-silica mineral particles that might otherwise be unidentifiable. Results indicate the occurrence of detritial minerals in both Okefenokee and Snuggedy Swamp peats, the presence of authigenic or diagenetic minerals growing within peats, and dissolution features on freshwater sponge spicules that may account for the absence of spicules in Tertiary lignites.

  16. Average Energy Expended Per Electron-Hole Pair in Germanium Detector for Dark Matter Searches

    NASA Astrophysics Data System (ADS)

    Wei, Wenzhao; Wang, Lu; Mei, Dongming; Cubed Collaboration

    2016-03-01

    The value of ɛ, the average energy expended per electron-hole pair, plays a critical role in determining the energy threshold of a bolometer detector with germanium in dark matter searches. We propose an independent method to estimate the value of ɛ down to milli-Kelvin range, which is the operating temperature for a SuperCDMS-like detector. A theoretical model and experimental analysis algorithm are developed in this work to estimate the value of ɛ based on the relationship between ɛ, detector energy resolution (Fano factor) and the primary phonon energy. We also investigated the energy threshold for a SuperCDMS-like detector with the value of ɛ calculated from our model. In this work, we present our theoretical calculation and show how to use experimental data to evaluate the value of ɛ. Subsequently, we report the temperature dependence of ɛ and its value at 50 milli-Kelvin. This work is supported by NSF in part by the NSF OIA 1434142, DOE Grant DE-FG02-10ER46709, and the State of South Dakota.

  17. Ab initio calculations of the electron momentum distribution function for ordered and disordered warm dense matter (WDM)

    NASA Astrophysics Data System (ADS)

    Klevak, E.; Mattern, B. A.; Kas, J. J.; Rehr, J. J.; Seidler, G. T.

    2014-03-01

    We report new calculations of the electron momentum distribution n(p) for ordered and disordered materials of interest for warm dense matter research. The central role of the electron-ion interaction and the need to orthogonalize the valence-electron and core-electron wave functions has often been ignored in the interpretation of x-ray Thomson scattering studies of WDM.[2] This has led to substantial uncertainty in the inferred temperatures and ionization states in laser-shock generated dense plasmas. Real space Green's function calculations as a function of density and disorder are used to evaluate the possibility of a broadly applicable universal rescaling of the free-electron n(p) by an effective volume and effective temperature to approximate the effects of valence-core orthogonalization. Supported in part by DOE BES Grant DEFG03-97ER45623 (EK, JJR, JJK) and DOE-BES DE-SC0002194(BAM and GTS).

  18. Implementation of Electronic Commerce in the Department of Defense and the National Aeronautics and Space Administration.

    DTIC Science & Technology

    1996-12-01

    President Clinton’s Executive Memorandum of 26 October 1993 mandated that all Federal Government agencies implement Electronic Commerce (EC) in order... Electronic Commerce /Electronic Data Interchange (EC/EDI) architecture. The NASA employed an Internet based tool, the NASA Acquisition Internet Service

  19. CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES: Spin Relaxation of Electrons in Single InAs Quantum Dots

    NASA Astrophysics Data System (ADS)

    Ma, Shan-Shan; Dou, Xiu-Ming; Chang, Xiu-Ying; Sun, Bao-Quan; Xiong, Yong-Hua; Niu, Zhi-Chuan; Ni, Hai-Qiao

    2009-11-01

    By using polarization-resolved photoluminescence spectra, we study the electron spin relaxation in single InAs quantum dots (QDs) with the configuration of positively charged excitons X+ (one electron, two holes). The spin relaxation rate of the hot electrons increases with the increasing energy of exciting photons. For electrons localized in QDs the spin relaxation is induced by hyperfine interaction with the nuclei. A rapid decrease of polarization degree with increasing temperature suggests that the spin relaxation mechanisms are mainly changed from the hyperfine interaction with nuclei into an electron-hole exchange interaction.

  20. Single-shot mega-electronvolt ultrafast electron diffraction for structure dynamic studies of warm dense matter

    DOE PAGES

    Mo, M. Z.; Shen, X.; Chen, Z.; ...

    2016-08-04

    We have developed a single-shot mega-electronvolt ultrafast-electron-diffraction system to measure the structural dynamics of warm dense matter. The electron probe in this system is featured by a kinetic energy of 3.2 MeV and a total charge of 20 fC, with the FWHM pulse duration and spot size at sample of 350 fs and 120 µm respectively. We demonstrate its unique capability by visualizing the atomic structural changes of warm dense gold formed from a laser-excited 35-nm freestanding single-crystal gold foil. The temporal evolution of the Bragg peak intensity and of the liquid signal during solid-liquid phase transition are quantitatively determined.more » This experimental capability opens up an exciting opportunity to unravel the atomic dynamics of structural phase transitions in warm dense matter regime« less

  1. Isochoric heating of hot dense matter by magnetization of fast electrons produced by ultra-intense short pulse irradiation

    NASA Astrophysics Data System (ADS)

    Sentoku, Y.; Kemp, A.; Bakeman, M.; Presura, R.; Cowan, T. E.

    2006-06-01

    Ultra-intense short-pulse lasers are important tools for creating short-lived high energy plasmas, however to date, it has not been possible, with this method, to create several hundred eV solid density matter because of the rapid transport of the laser-generated hot electrons throughout the target volume. We propose a new way to isochorically heat matter at solid density to extreme temperatures by magnetic confinement of laser-generated hot electrons for several picoseconds by application of a multi-MG external field. In advance of an experiment at the Nevada Terawatt Facility (NTF), using a 100 TW-class laser, which will be synchronized to a 1MA Z-pinch machine, we have performed theoretical studies using a collisional particle-in-cell codes PICLS, which is optimized for a study of isochoric heating of solid density plasmas.

  2. Single-shot mega-electronvolt ultrafast electron diffraction for structure dynamic studies of warm dense matter

    SciTech Connect

    Mo, M. Z.; Shen, X.; Chen, Z.; Li, R. K.; Dunning, M.; Sokolowski-Tinten, K.; Zheng, Q.; Weathersby, S. P.; Reid, A. H.; Coffee, R.; Makasyuk, I.; Edstrom, S.; McCormick, D.; Jobe, K.; Hast, C.; Glenzer, S. H.; Wang, X.

    2016-08-04

    We have developed a single-shot mega-electronvolt ultrafast-electron-diffraction system to measure the structural dynamics of warm dense matter. The electron probe in this system is featured by a kinetic energy of 3.2 MeV and a total charge of 20 fC, with the FWHM pulse duration and spot size at sample of 350 fs and 120 µm respectively. We demonstrate its unique capability by visualizing the atomic structural changes of warm dense gold formed from a laser-excited 35-nm freestanding single-crystal gold foil. The temporal evolution of the Bragg peak intensity and of the liquid signal during solid-liquid phase transition are quantitatively determined. This experimental capability opens up an exciting opportunity to unravel the atomic dynamics of structural phase transitions in warm dense matter regime

  3. Safeguarding the process of drug administration with an emphasis on electronic support tools

    PubMed Central

    Seidling, Hanna M; Lampert, Anette; Lohmann, Kristina; Schiele, Julia T; Send, Alexander J F; Witticke, Diana; Haefeli, Walter E

    2013-01-01

    Aims The aim of this work is to understand the process of drug administration and identify points in the workflow that resulted in interventions by clinical information systems in order to improve patient safety. Methods To identify a generic way to structure the drug administration process we performed peer-group discussions and supplemented these discussions with a literature search for studies reporting errors in drug administration and strategies for their prevention. Results We concluded that the drug administration process might consist of up to 11 sub-steps, which can be grouped into the four sub-processes of preparation, personalization, application and follow-up. Errors in drug handling and administration are diverse and frequent and in many cases not caused by the patient him/herself, but by family members or nurses. Accordingly, different prevention strategies have been set in place with relatively few approaches involving e-health technology. Conclusions A generic structuring of the administration process and particular error-prone sub-steps may facilitate the allocation of prevention strategies and help to identify research gaps. PMID:24007450

  4. Condensed-matter ab initio approach for strongly correlated electrons: Application to a quantum spin liquid candidate

    SciTech Connect

    Yamaji, Youhei

    2015-12-31

    Recently, condensed-matter ab initio approaches to strongly correlated electrons confined in crystalline solids have been developed and applied to transition-metal oxides and molecular conductors. In this paper, an ab initio scheme based on constrained random phase approximations and localized Wannier orbitals is applied to a spin liquid candidate Na{sub 2}IrO{sub 3} and is shown to reproduce experimentally observed specific heat.

  5. Measurement of reflectivity of spherically bent crystals using Kα signal from hot electrons produced by laser-matter interaction

    SciTech Connect

    Antonelli, L.; Forestier-Colleoni, P.; Folpini, G.; Bouillaud, R.; Fedeli, L.; Fourment, C.; Giuffrida, L.; Hulin, S.; Santos, J. J.; Volpe, L.; Batani, D.; Faenov, A.; Pikuz, S.

    2015-07-15

    In an experiment at the laser facility ECLIPSE of the CELIA laboratory, University of Bordeaux, we measure the reflectivity of spherically bent crystals that are commonly used to investigate the propagation of fast electrons through the Kα radiation they generate in matter. The experimental reflectivity compares well with predictions from a ray-tracing code that takes into account the specific geometry, although the crystals seem to suffer from aging problems.

  6. 77 FR 48007 - Administrative Simplification: Adoption of Operating Rules for Health Care Electronic Funds...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-08-10

    ... Spending Projections Through 2020: Economic Recovery and Reform drive faster Spending Growth,'' Health..., ``The achievement of the vision of seamless electronic flow of information in a confidential and...

  7. Anisotropic diffusion of electrons in liquid xenon with application to improving the sensitivity of direct dark matter searches

    SciTech Connect

    Sorensen, P

    2011-02-14

    Electron diffusion in a liquid xenon time projection chamber has recently been used to infer the z coordinate of a particle interaction, from the width of the electron signal. The goal of this technique is to reduce the background event rate by discriminating edge events from bulk events. Analyses of dark matter search data which employ it would benefit from increased longitudinal electron diffusion. We show that a significant increase is expected if the applied electric field is decreased. This observation is trivial to implement but runs contrary to conventional wisdom and practice. We also extract a first measurement of the longitudinal diffusion coefficient, and confirm the expectation that electron diffusion in liquid xenon is highly anisotropic under typical operating conditions.

  8. 76 FR 39263 - Antidumping and Countervailing Duty Proceedings: Electronic Filing Procedures; Administrative...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-07-06

    ... also indicate whether that person prefers to or consents to electronic service (i.e., e-mail) for... electronic or manual filing falls on a non-business day, the Secretary will accept documents filed on the... explained why pro se respondents and small businesses should automatically be exempt from the...

  9. 75 FR 44163 - Antidumping and Countervailing Duty Proceedings: Electronic Filing Procedures; Administrative...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-07-28

    ... provision for electronic release of business proprietary information under APO can be reflected in the terms...-business day, the Secretary will accept documents that are filed on the next business day. (2) Electronic... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF...

  10. 78 FR 31879 - General Services Administration Acquisition Regulation (GSAR); Electronic Contracting Initiative...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-05-28

    ... From the Federal Register Online via the Government Publishing Office GENERAL SERVICES... Regulation (GSAR); Electronic Contracting Initiative (ECI) AGENCY: Office of Acquisition Policy, General... (Federal Supply Schedule) clause, and an Alternate I version of the clause that will require...

  11. Health Literacy Assessment of the STOFHLA: Paper versus Electronic Administration Continuation Study

    ERIC Educational Resources Information Center

    Chesser, Amy K.; Keene Woods, Nikki; Wipperman, Jennifer; Wilson, Rachel; Dong, Frank

    2014-01-01

    Low health literacy is associated with poor health outcomes. Research is needed to understand the mechanisms and pathways of its effects. Computer-based assessment tools may improve efficiency and cost-effectiveness of health literacy research. The objective of this preliminary study was to assess if administration of the Short Test of Functional…

  12. CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES: Electron Dispersion in Liquid Alkali and Their Alloys

    NASA Astrophysics Data System (ADS)

    Vora, Aditya M.

    2010-07-01

    Ashcroft's local empty core (EMC) model pseudopotential in the second-order perturbation theory is used to study the electron dispersion relation, the Fermi energy, and deviation in the Fermi energy from free electron value for the liquid alkali metals and their equiatomic binary alloys for the first time. In the present computation, the use of pseudo-alloy-atom model (PAA) is proposed and found successful. The influence of the six different forms of the local field correction functions proposed by Hartree (H), Vashishta-Singwi (VS), Taylor (T), Ichimaru-Utsumi (IU), Farid et al. (F), and Sarkar et al. (S) on the aforesaid electronic properties is examined explicitly, which reflects the varying effects of screening. The depth of the negative hump in the electron dispersion of liquid alkalis decreases in the order Li → K, except for Rb and Cs, it increases. The results of alloys are in predictive nature.

  13. What can 1970's Elastic Electron Scattering Experiments tell us about the Direct Detection of Dark Matter?

    NASA Astrophysics Data System (ADS)

    Dūda, Gintaras

    2007-11-01

    Theoretical calculations of neutralino cross sections with various nuclei are of great interest to direct dark matter searches such as CDMS, EDELWEISS, ZEPLIN, and other experiments. These cross sections and direct detection rates are generally computed with generic, one or two parameter model-dependent nuclear form factors; these form factors are usually analytic approximations to the fourier transform of two-parameter Fermi nuclear charge densities, and may not mirror the actual form factor for nuclei important in direct dark matter searches. Elastic electron scattering, largely compiled in the 1970s, can allow for very precise determinations of nuclear form factors and hence nuclear charge densities for spherical or near-spherical nuclei. We compare model independent form factors derived from elastic electron scattering data to commonly utilized model dependent form factors for various target nuclei important in dark matter searches, such as Si, Ge, S, Ca and others. We have found that for nuclear recoils in the range of 10-100 keV significant differences in cross sections and rates exist when the model independent form factors are used.

  14. 76 FR 60870 - In the Matter of Certain Electronic Devices With Communication Capabilities, Components Thereof...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-09-30

    ..., and Related Software; Notice of Institution of Investigation; Institution of Investigation Pursuant to... electronic devices with communication capabilities, components thereof, and related software by reason of... certain electronic devices with communication capabilities, components thereof, and related software...

  15. Observation of Dynamical spin shielding in Ce: Why It Matters for Pu Electronic Structure

    SciTech Connect

    Tobin, J G; Yu, S W; Chung, B W; Morton, S A; Komesua, T; Waddill, G D

    2007-03-08

    In a series of experiments and linked theoretical modeling, the range of possible solutions for Pu electronic structure has been dramatically reduced. Nevertheless, the key issue of electron correlation remains.

  16. The Fall of the Faculty: The Rise of the All-Administrative University and Why It Matters

    ERIC Educational Resources Information Center

    Ginsberg, Benjamin

    2011-01-01

    Until very recently, American universities were led mainly by their faculties, which viewed intellectual production and pedagogy as the core missions of higher education. Today, as Benjamin Ginsberg warns in this eye-opening, controversial book, "deanlets"--administrators and staffers often without serious academic backgrounds or experience--are…

  17. Contributions of organic matter and organic sulfur redox processes to electron flow in anoxic incubations of peat

    NASA Astrophysics Data System (ADS)

    YU, Zhiguo; Peiffer, Stefan; Göttlicher, Jörg; Knorr, Klaus-Holger

    2015-04-01

    Anaerobic decomposition of peat soils involves a number of interdependent microbial processes that ultimately generate CO2 and CH4. In many peat soils, a high ratio of CO2:CH4 was reported, which presumably results from a direct or indirect role of soil organic matter serving as an electron acceptor. Therefore, in this study we intended to test the hypothesis that organic matter (OM) suppresses methanogenesis and sustains anaerobic CO2 production, serving as i) direct electron acceptor or ii) via supporting internal sulfur cycling to maintains CO2 production through bacterial sulfate reduction (BSR). We incubated peat samples of commercial bog peat, inoculated with a small amount of fresh peat to introduce an active microbial community. Samples were amended with sulfate or sulfide and incubated under anoxic conditions for 6 weeks at 30 ° C. Upon anaerobic incubation of peat virtually devoid of inorganic electron acceptors, CO2 and CH4 were produced at a ratio of 3.2. According to the electron budget, the calculated electron accepting capacity (EAC) of OM was 2.36 μeq cm3 d-1. Addition of sulfate significantly increased CO2 production and effectively suppressed CH4 production. After subtracting the EAC provided though sulfate addition (0.97~2.81 μeq cm-3 d-1), EACs supplied by OM reached 3.88 to 4.85 μeq cm-3 d-1.The contribution of organic sulfur was further evaluated by XANES spectroscopy and using natural abundance of δ34S as a tracer. Results demonstrated that BSR involved both addition of H2S and sulfate to OM leading to a formation of reduced organic sulfur and partial changes of oxidized organic sulfur species. The original peat prior to incubation contained 70.5% reduced organic S (R-S-H, R-S-R, R-S-S-R), and 25.9% oxidized S (R-SO3, R-SO2-R, R-SO4-R), whereas the treatment with H2S or sulfate addition comprised 75.7~ 81.1% reduced organic S, and only 21.1~18.9 % oxidized S. Our results imply that that organic matter contributes to anaerobic respiration

  18. 78 FR 45026 - Revisions to the Export Administration Regulations (EAR): Control of Military Electronic...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-07-25

    ...This is the second proposed rule to describe how military electronics and certain superconducting and cryogenic equipment and related items the President determines no longer warrant control under the United States Munitions List (USML) would be controlled on the Commerce Control List (CCL). This proposed rule also would amend ECCNs 7A001 and 7A101 to apply the ``missile technology'' reason......

  19. 76 FR 6186 - Applications for Membership on the Electronic Tax Administration Advisory Committee (ETAAC)

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-02-03

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  20. 78 FR 10693 - Open Season for Membership to the Electronic Tax Administration Advisory Committee (ETAAC)

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-02-14

    ..., (2) transmitters of electronic returns, (3) tax software developers, (4) large and small business, (5... facsimile to (202) 283-2845 (not a toll-free number). An application can be obtained by sending an email to etaac@irs.gov or calling (202) 283-2178 (not a toll-free number). FOR FURTHER INFORMATION...

  1. CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES: Electronic States of Elliptical Quantum Rings Subjected to a Magnetic Field

    NASA Astrophysics Data System (ADS)

    Li, Hai-Tao; Liu, Li-Zhe; Liu, Jian-Jun

    2008-11-01

    We calculate the energy states and Aharonov-Bohm oscillations of an electron in elliptical quantum rings in the presence of a uniform magnetic Geld by using an exact numerical diagonalization. The calculated results show that the elliptical quantum rings are flatter, larger amplitudes and periods of the Aharonov-Bohm oscillations are observed. In addition, in the limits of a circular quantum ring, the results of our approach are in good agreement with those of earlier theories.

  2. Gambling revenues as a public administration issue: electronic gaming machines in Victoria.

    PubMed

    Pickernell, David; Keast, Robyn; Brown, Kerry; Yousefpour, Nina; Miller, Chris

    2013-12-01

    Gambling activities and the revenues derived have been seen as a way to increase economic development in deprived areas. There are also, however, concerns about the effects of gambling in general and electronic gaming machines (EGMs) in particular, on the resources available to the localities in which they are situated. This paper focuses on the factors that determine the extent and spending of community benefit-related EGM-generated resources within Victoria, Australia, focusing in particular on the relationships between EGM activity and socio-economic and social capital indicators, and how this relates to the community benefit resources generated by gaming.

  3. CONDENSED MATTER: STRUCTURE, THERMAL AND MECHANICAL PROPERTIES: Electronic, thermodynamic and elastic properties of pyrite RuO2

    NASA Astrophysics Data System (ADS)

    Yang, Ze-Jin; Guo, Yun-Dong; Wang, Guang-Chang; Li, Jin; Dai, Wei; Liu, Jin-Chao; Cheng, Xin-Lu; Yang, Xiang-Dong

    2009-11-01

    This paper calculates the elastic, thermodynamic and electronic properties of pyrite (Pabar 3) RuO2 by the plane-wave pseudopotential density functional theory (DFT) method. The lattice parameters, normalized elastic constants, Cauchy pressure, brittle-ductile relations, heat capacity and Debye temperature are successfully obtained. The Murnaghan equation of state shows that pyrite RuO2 is a potential superhard material. Internal coordinate parameter increases with pressure, which disagrees with experimental data. An analysis based on electronic structure and the pseudogap reveals that the bonding nature in RuO2 is a combination of covalent, ionic and metallic bonding. A study of the elastic properties indicates that the pyrite phase is isotropic under usual conditions. The relationship between brittleness and ductility shows that pyrite RuO2 behaves in a ductile matter at zero pressure and the degree of ductility increases with pressure.

  4. Electron attachment to the cytosine-centered DNA single strands: does base stacking matter?

    PubMed

    Gu, Jiande; Wang, Jing; Leszczynski, Jerzy

    2012-02-02

    Electron attachment to the trimer of nucleotide, dGpdCpdG, has been investigated by a quantum mechanical approach at a reliable level of theory. The study of the electron attached dGpdCpdG species demonstrates that cytosine contained DNA single strands have a strong tendency to capture low-energy electrons and to form electronically stable cytosine-centered radical anions. The comparative study of the model molecules pdCpdG and dGpdCp reveals that base stacking has little contribution to the adiabatic electron affinity (AEA) of cytosine in DNA single strands. Additionally, the base-base stacking does not affect the vertical detachment energy (VDE) of the cytosine-centered radicals. Intrastrand H-bonding is found to be critical in increasing the values of the AEA and VDE. However, base-base stacking is revealed to be important in enlarging the vertical electron affinity (VEA) of cytosine. The electron attachment to the cytosine moiety intensifies the intrastrand H-bonding between the neighboring G and C bases. This process disrupts the base-base stacking interaction in the radical anion of dGpdCpdG.

  5. Electron Holes in phase-space: what they are and why they matter

    NASA Astrophysics Data System (ADS)

    Hutchinson, I. H.

    2016-10-01

    Plasma electron holes are soliton-like electric potential structures sustained self-consistently by a deficit of phase-space density on trapped orbits. They are a class of Bernstein Green and Kruskal (BGK)-mode phase-space vortices, long studied in basic analytic and computational theory and observed in some experiments. Recently it has become clear from space-craft observations that isolated potential structures with the character of electron holes constitute an important component of space-plasma turbulence. Modern computational simulations of collisionless plasmas also often observe electron holes to form as a nonlinear consequence of kinetic electron instabilities. This tutorial will explain the basic theory of electron hole structure, trace the development of the understanding of electron holes, and survey some of the observational evidence for their significance. It was found early on that unmagnetized multidimensional simulations of electron two-stream instabilities do not show the long lived holes that appear in one dimension. Deliberately-created 1-D slab holes in multiple dimensions experience a transverse instability unless the guiding magnetic field is strong enough. Analysis has yet to identify unequivocally the instability mechanism and threshold; but it can show that spherically symmetric holes in 3-D without magnetic field are essentially impossible. Recent simulations have studied holes' formation, self-acceleration, merging, splitting, and growth. Analytic understanding of many of these phenomena is gained from the kinematics of the hole regarded as a coherent entity, accounting for the plasma momentum changes it induces, and especially the interaction with the ions. Electron holes can travel at up to approximately the electron thermal speed, but not slower (relative to ions) than several times the ion acoustic speed. Some notable current research questions will be described.

  6. Searching for Dark Matter Signatures in the GLAST LAT Electron Flux

    NASA Technical Reports Server (NTRS)

    Moiseev, Alexander; Profumo, Stefano

    2008-01-01

    We explored several viable scenarios of how LAT might observe DM, when the spectral feature is predicted to be observed in the HE electron flux It has been demonstrated elsewhere that LAT will be capable to detect HE electrons flux in energy range from 20 GeV to - 1 TeV with 520% energy resolution and good statistics If there is a DM-caused feature in the HE electron flux (in the range 20 GeV - 1 TeV), LAT will be the best current instrument to observe it!

  7. How Klingler's dissection permits exploration of brain structural connectivity? An electron microscopy study of human white matter.

    PubMed

    Zemmoura, Ilyess; Blanchard, Emmanuelle; Raynal, Pierre-Ivan; Rousselot-Denis, Cécilia; Destrieux, Christophe; Velut, Stéphane

    2016-06-01

    The objective of this study is to explore histological and ultrastructural changes induced by Klingler's method. Five human brains were prepared. First, the effects of freezing-defrosting on white matter were explored with optical microscopy on corpus callosum samples of two brains; one prepared in accordance with the description of Klingler (1956) and the other without freezing-defrosting. Then, the combined effect of formalin fixation and freezing-defrosting was explored with transmission electron microscopy (EM) on samples of cingulum from one brain: samples from one hemisphere were fixed in paraformaldehyde-glutaraldehyde (para/gluta), other samples from the other hemisphere were fixed in formalin; once fixed, half of the samples were frozen-defrosted. Finally, the effect of dissection was explored from three formalin-fixed brains: one hemisphere of each brain was frozen-defrosted; samples of the corpus callosum were dissected before preparation for scanning EM. Optical microscopy showed enlarged extracellular space on frozen samples. Transmission EM showed no significant alteration of white matter ultrastructure after formalin or para/gluta fixation. Freezing-defrosting created extra-axonal lacunas, larger on formalin-fixed than on para/gluta-fixed samples. In all cases, myelin sheaths were preserved, allowing maintenance of axonal integrity. Scanning EM showed the destruction of most of the extra-axonal structures after freezing-defrosting and the preservation of most of the axons after dissection. Our results are the first to highlight the effects of Klingler's preparation and dissection on white matter ultrastructure. Preservation of myelinated axons is a strong argument to support the reliability of Klingler's dissection to explore the structure of human white matter.

  8. Estimation of agricultural and logging injury incidence in Maine using electronic administrative data sets.

    PubMed

    Scott, Erika E; Krupa, Nicole L; Horsman, Melissa; Jenkins, Paul L

    2015-01-01

    Agriculture and forestry rank among industries with the highest rates of occupational fatality and injury. Establishing a nonfatal injury surveillance system is a top priority in the National Occupational Research Agenda. Recently, new sources of data such as Pre-Hospital Care Reports (PCRs) and hospitalization data have transitioned to electronic databases. Using narrative free text and location codes from Maine PCRs, along with International Classification of Diseases (ICD)-9 External Cause of Injury Codes (E-codes) in Maine hospital data, researchers are designing a surveillance system to track farm and forestry injury that utilizes electronic match-merging of the two data sources. For 2008, PCR records produced a total of 104 true agricultural cases. Of these, 66 (63%) were identified from the keyword/visual inspection process alone, 25 (24%) were identified by the farm checkbox only, and the remaining 13 (13%) by both methods. For the 150 unique injury events found in hospitalization data, 146 had the initial episode of care documented in only one of the three hospital files. The emergency department (ED) file had the largest number of these (123/146 = 84.2%), followed by the outpatient file (12/146 = 8.2%) and the inpatient file (11/146 = 7.5%). Of the 250 unique agricultural injuries identified (100 PCR only + 146 hospital only + 4 from both), 66 (26%) would not have been identified without free text review of PCR narrative. The false-positive rate (97.14%) keyword searches underscores that without visual inspection, it is not an effective strategy. Both sources of data (PCR and hospital data) need to be used in a continued surveillance system.

  9. 75 FR 38118 - In the Matter of Certain Electronic Devices With Image Processing Systems, Components Thereof...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-07-01

    ... Associated Software; Notice of Investigation AGENCY: U.S. International Trade Commission. ACTION: Institution... processing systems, components thereof, and associated software by reason of infringement of certain claims... certain electronic devices with image processing systems, components thereof, and associated software...

  10. Neutrino emissivity from electron-positron annihilation in hot matter in a strong magnetic field

    SciTech Connect

    Amsterdamski, P.; Haensel, P. )

    1990-10-15

    The neutrino emissivity due to electron-positron annihilation in a strong magnetic field is computed. A strong magnetic field can significantly increase the neutrino emissivity at {ital T}{similar to}10{sup 9} K.

  11. Cosmic rays in a dynamical halo. I - Age and matter traversal distributions and anisotropy for nuclei. II - Electrons

    NASA Technical Reports Server (NTRS)

    Owens, A. J.; Jokipii, J. R.

    1977-01-01

    Recent measurements of the mean lifetime of galactic cosmic rays (at least 10 million yr) have suggested a dynamical halo model of cosmic-ray confinement to the Galaxy. A one-dimensional version of the model is analyzed to determine the ranges of parameters required to give self-consistent values of the mean lifetime, matter traversed, anisotropy, and interstellar gamma-ray flux. It is found that the ranges of the parameters are: disk scale height of 4000-10,000 pc, average convection velocity of no more than 60 km/s, and diffusion coefficient of (3-10) by 10 to the 28th power sq cm/sec for particles with charges of the order of 10 GV. Some consequences for this model of a much shorter lifetime are also discussed. The energy spectrum and spatial distribution of electrons in the dynamical halo model are considered. A gradual steepening of the electron energy spectrum beginning at several GeV energy is found, as indicated by observations. The decrease of electron density with height in the halo depends on the particle energy and may be much steeper than that for nuclei. The models give a halo with a scale height of the order of 3 kpc for several-GeV electrons, which is shown to be consistent with radio observations.

  12. Simulation of the Correlated Electron Plasma in the Warm Dense Matter Regime by Restricted Path-Integral Molecular Dynamics

    NASA Astrophysics Data System (ADS)

    Kapila, Vivek; Deymier, Pierre; Runge, Keith

    2012-02-01

    Warm dense matter (WDM) can be characterized by electron temperatures of a few eV and densities an order of magnitude or more beyond ambient. This regime currently lacks any adequate highly developed class of simulation methods. Recent developments in orbital-free Density Functional Theory (ofDFT) aim to provide such a simulation method, however, little benchmark information is available on temperature and pressure dependence of simple but realistic models in WDM regime. The present work aims to fill this critical gap using the restricted path-integral molecular dynamics (rPIMD) method. Within the discrete path integral representation, electrons are described as harmonic necklaces, while, quantum exchange takes the form of cross linking between electron necklaces. The fermion sign problem is addressed by restricting the density matrix to positive values and a molecular dynamics algorithm is employed to sample phase space. Here, we focus on the behavior of strongly correlated electron plasmas under WDM conditions. We compute the kinetic and potential energies and compare them to those obtained with the ofDFT method.

  13. Comparison of electron transport calculations in warm dense matter using the Ziman formula

    DOE PAGES

    Burrill, D. J.; Feinblum, D. V.; Charest, M. R. J.; ...

    2016-02-10

    The Ziman formulation of electrical conductivity is tested in warm and hot dense matter using the pseudo-atom molecular dynamics method. Several implementation options that have been widely used in the literature are systematically tested through a comparison to the accurate, but expensive Kohn–Sham density functional theory molecular dynamics (KS-DFT-MD) calculations. As a result, the comparison is made for several elements and mixtures and for a wide range of temperatures and densities, and reveals a preferred method that generally gives very good agreement with the KS-DFT-MD results, but at a fraction of the computational cost.

  14. Impairment of electron transfer chain induced by acute carnosine administration in skeletal muscle of young rats.

    PubMed

    Macarini, José Roberto; Maravai, Soliany Grassi; Cararo, José Henrique; Dimer, Nádia Webber; Gonçalves, Cinara Ludvig; Kist, Luiza Wilges; Bogo, Mauricio Reis; Schuck, Patrícia Fernanda; Streck, Emilio Luiz; Ferreira, Gustavo Costa

    2014-01-01

    Serum carnosinase deficiency is an inherited disorder that leads to an accumulation of carnosine in the brain tissue, cerebrospinal fluid, skeletal muscle, and other tissues of affected patients. Considering that high levels of carnosine are associated with neurological dysfunction and that the pathophysiological mechanisms involved in serum carnosinase deficiency remain poorly understood, we investigated the in vivo effects of carnosine on bioenergetics parameters, namely, respiratory chain complexes (I-III, II, and II-III), malate dehydrogenase, succinate dehydrogenase, and creatine kinase activities and the expression of mitochondrial-specific transcription factors (NRF-1, PGC-1α , and TFAM) in skeletal muscle of young Wistar rats. We observed a significant decrease of complexes I-III and II activities in animals receiving carnosine acutely, as compared to control group. However, no significant alterations in respiratory chain complexes, citric acid cycle enzymes, and creatine kinase activities were found between rats receiving carnosine chronically and control group animals. As compared to control group, mRNA levels of NRF-1, PGC-1α , and TFAM were unchanged. The present findings indicate that electron transfer through the respiratory chain is impaired in skeletal muscle of rats receiving carnosine acutely. In case these findings are confirmed by further studies and ATP depletion is also observed, impairment of bioenergetics could be considered a putative mechanism responsible for the muscle damage observed in serum carnosinase-deficient patients.

  15. Impairment of Electron Transfer Chain Induced by Acute Carnosine Administration in Skeletal Muscle of Young Rats

    PubMed Central

    Macarini, José Roberto; Maravai, Soliany Grassi; Cararo, José Henrique; Dimer, Nádia Webber; Gonçalves, Cinara Ludvig; Kist, Luiza Wilges; Bogo, Mauricio Reis; Schuck, Patrícia Fernanda; Streck, Emilio Luiz; Ferreira, Gustavo Costa

    2014-01-01

    Serum carnosinase deficiency is an inherited disorder that leads to an accumulation of carnosine in the brain tissue, cerebrospinal fluid, skeletal muscle, and other tissues of affected patients. Considering that high levels of carnosine are associated with neurological dysfunction and that the pathophysiological mechanisms involved in serum carnosinase deficiency remain poorly understood, we investigated the in vivo effects of carnosine on bioenergetics parameters, namely, respiratory chain complexes (I–III, II, and II-III), malate dehydrogenase, succinate dehydrogenase, and creatine kinase activities and the expression of mitochondrial-specific transcription factors (NRF-1, PGC-1α, and TFAM) in skeletal muscle of young Wistar rats. We observed a significant decrease of complexes I–III and II activities in animals receiving carnosine acutely, as compared to control group. However, no significant alterations in respiratory chain complexes, citric acid cycle enzymes, and creatine kinase activities were found between rats receiving carnosine chronically and control group animals. As compared to control group, mRNA levels of NRF-1, PGC-1α, and TFAM were unchanged. The present findings indicate that electron transfer through the respiratory chain is impaired in skeletal muscle of rats receiving carnosine acutely. In case these findings are confirmed by further studies and ATP depletion is also observed, impairment of bioenergetics could be considered a putative mechanism responsible for the muscle damage observed in serum carnosinase-deficient patients. PMID:24877122

  16. Femtosecond dynamics of energetic electrons in high intensity laser-matter interactions

    NASA Astrophysics Data System (ADS)

    Pompili, R.; Anania, M. P.; Bisesto, F.; Botton, M.; Castellano, M.; Chiadroni, E.; Cianchi, A.; Curcio, A.; Ferrario, M.; Galletti, M.; Henis, Z.; Petrarca, M.; Schleifer, E.; Zigler, A.

    2016-10-01

    Highly energetic electrons are generated at the early phases of the interaction of short-pulse high-intensity lasers with solid targets. These escaping particles are identified as the essential core of picosecond-scale phenomena such as laser-based acceleration, surface manipulation, generation of intense magnetic fields and electromagnetic pulses. Increasing the number of the escaping electrons facilitate the late time processes in all cases. Up to now only indirect evidences of these important forerunners have been recorded, thus no detailed study of the governing mechanisms was possible. Here we report, for the first time, direct time-dependent measurements of energetic electrons ejected from solid targets by the interaction with a short-pulse high-intensity laser. We measured electron bunches up to 7 nanocoulombs charge, picosecond duration and 12 megaelectronvolts energy. Our ’snapshots’ capture their evolution with an unprecedented temporal resolution, demonstrat- ing a significant boost in charge and energy of escaping electrons when increasing the geometrical target curvature. These results pave the way toward significant improvement in laser acceleration of ions using shaped targets allowing the future development of small scale laser-ion accelerators.

  17. Femtosecond dynamics of energetic electrons in high intensity laser-matter interactions

    PubMed Central

    Pompili, R.; Anania, M. P.; Bisesto, F.; Botton, M.; Castellano, M.; Chiadroni, E.; Cianchi, A.; Curcio, A.; Ferrario, M.; Galletti, M.; Henis, Z.; Petrarca, M.; Schleifer, E.; Zigler, A.

    2016-01-01

    Highly energetic electrons are generated at the early phases of the interaction of short-pulse high-intensity lasers with solid targets. These escaping particles are identified as the essential core of picosecond-scale phenomena such as laser-based acceleration, surface manipulation, generation of intense magnetic fields and electromagnetic pulses. Increasing the number of the escaping electrons facilitate the late time processes in all cases. Up to now only indirect evidences of these important forerunners have been recorded, thus no detailed study of the governing mechanisms was possible. Here we report, for the first time, direct time-dependent measurements of energetic electrons ejected from solid targets by the interaction with a short-pulse high-intensity laser. We measured electron bunches up to 7 nanocoulombs charge, picosecond duration and 12 megaelectronvolts energy. Our ’snapshots’ capture their evolution with an unprecedented temporal resolution, demonstrat- ing a significant boost in charge and energy of escaping electrons when increasing the geometrical target curvature. These results pave the way toward significant improvement in laser acceleration of ions using shaped targets allowing the future development of small scale laser-ion accelerators. PMID:27713541

  18. CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES: Orbital magnetization in semiconductors

    NASA Astrophysics Data System (ADS)

    Fang, Cheng; Wang, Zhi-Gang; Li, Shu-Shen; Zhang, Ping

    2009-12-01

    This paper theoretically investigates the orbital magnetization of electron-doped (n-type) semiconductor heterostructures and of hole-doped (p-type) bulk semiconductors, which are respectively described by a two-dimensional electron/hole Hamiltonian with both the included Rashba spin-orbit coupling and Zeeman splitting terms. It is the Zeeman splitting, rather than the Rashba spin-orbit coupling, that destroys the time-reversal symmetry of the semiconductor systems and results in nontrivial orbital magnetization. The results show that the magnitude of the orbital magnetization per hole and the Hall conductance in the p-type bulk semiconductors are about 10-2-10-1 effective Bohr magneton and 10-1-1 e2/h, respectively. However, the orbital magnetization per electron and the Hall conductance in the n-type semiconductor heterostructures are too small to be easily observed in experiment.

  19. Nearsightedness of electronic matter as seen by a physicist and a chemist.

    PubMed

    Bader, Richard F W

    2008-12-25

    The theorem of Hohenberg and Kohn, that the electron density is a unique functional of the external potential, applies to a closed system with a fixed number of electrons. Transferability of the electron density of an atom between two systems, necessary to account for the fundamental role of a functional group with characteristic properties in chemistry, however, is a problem in the physics of an open system. Transferability in chemistry requires a new theorem stated in terms of the density: that the electron density of an atom in a molecule or crystal determines its additive contribution to all properties of the total system, its transferability being determined by a paralleling degree of transferability in the atom's virial field, the virial of the Ehrenfest force exerted on its electron density. Transferability of the virial field is found in spite of unavoidable changes in the external potential that occur on transfer. The properties of an atom in a molecule are determined by the Heisenberg equation of motion for a "proper open system" derived from the principle of stationary action. The theorem is grounded in the common sense observation that two atoms that "look the same", i.e., have the same charge distribution, must possess identical properties. Transferability is discussed in terms of the properties of the electron density, the one-density and the two-density matrix, the latter demonstrating that both the Coulombic and exchange contributions to the energy of a group are separately transferable. It is demonstrated that the exchange indices determined by the two-density matrix provide a readily determinable measure of the effective range of the exchange energy.

  20. Constraining neutrinos as background to wimp-nucleon dark matter particle searches for DaMIC: CCD physics analysis and electronics development

    NASA Astrophysics Data System (ADS)

    Butner, Melissa Jean

    The DaMIC (Dark Matter in CCDs) experiment searches for dark matter particles using charge coupled devices (CCDs) operated at a low detection threshold of ˜40 eV electron equivalent energy (eVee). A multiplexor board is tested for DAMIC100+ which has the ability to control up to 16 CCDs at one time allowing for the selection of a single CCD for readout while leaving all others static and maintaining sub-electron noise. A dark matter limit is produced using the results of physics data taken with the DAMIC experiment. Next, the contribution from neutrino-nucleus coherent scattering is investigated using data from the Coherent Neutrino Nucleus Interaction Experiment (CONnuIE) using the same CCD technology. The results are used to explore the performance of CCD detectors that ultimately will limit the ability to differentiate incident solar and atmospheric neutrinos from dark matter particles.

  1. CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Electronic Transport Calculations Using Maximally-Localized Wannier Functions

    NASA Astrophysics Data System (ADS)

    Wang, Neng-Ping

    2011-01-01

    I present a method to calculate the ballistic transport properties of atomic-scale structures under bias. The electronic structure of the system is calculated using the Kohn-Sham scheme of density functional theory (DFT). The DFT eigenvectors are then transformed into a set of maximally localized Wannier functions (MLWFs) [N. Marzari and D. Vanderbilt, Phys. Rev. B 56 (1997) 12847]. The MLWFs are used as a minimal basis set to obtain the Hamitonian matrices of the scattering region and the adjacent leads, which are needed for transport calculation using the nonequilibrium Green's function formalism. The coupling of the scattering region to the semi-infinite leads is described by the self-energies of the leads. Using the nonequilibrium Green's function method, one calculates self-consistently the charge distribution of the system under bias and evaluates the transmission and current through the system. To solve the Poisson equation within the scheme of MLWFs I introduce a computationally efficient method. The method is applied to a molecular hydrogen contact in two transition metal monatomic wires (Cu and Pt). It is found that for Pt the I-V characteristics is approximately linear dependence, however, for Cu the I-V characteristics manifests a linear dependence at low bias voltages and exhibits apparent nonlinearity at higher bias voltages. I have also calculated the transmission in the zero bias voltage limit for a single CO molecule adsorbed on Cu and Pt monatomic wires. While a chemical scissor effect occurs for the Cu monatomic wire with an adsorbed CO molecule, it is absent for the Pt monatomic wire due to the contribution of d-orbitals at the Fermi energy.

  2. Nonthermal electron-positron pairs and cold matter in the central engines of active galactic nuclei

    NASA Technical Reports Server (NTRS)

    Zdziarski, Andrzej A.

    1992-01-01

    The nonthermal e(+/-) pair model of the central engine of active galactic nuclei (AGNs) is discussed. The model assumes that nonthermal e(+/-) pairs are accelerated to highly relativistic energies in a compact region close to the central black hole and in the vicinity of some cold matter. The model has a small number of free parameters and explains a large body of AGN observations from EUV to soft gamma-rays. In particular, the model explains the existence of the UV bump, the soft X-rays excess, the canonical hard X-ray power law, the spectral hardening above about 10 keV, and some of the variability patterns in the soft and hard X-rays. In addition, the model explains the spectral steepening above about 50 keV seen in NGC 4151.

  3. Coherence in laser-driven electrons at the surface and in the volume of solid matter

    NASA Astrophysics Data System (ADS)

    Hommelhoff, Peter

    2017-01-01

    The femtosecond frequency comb allows controlling the carrier field of ultrashort laser pulses. We show two examples on how this control over fields oscillating with a few hundred terahertz can be utilized to control electrons at the surface and in the volume of solids. After a brief discussion of strong-field physics at metal needle tips, we show how ultrafast two-color laser pulses allow quantum path interference to dramatically alter the emission current from sharp tips, with an interference visibility of 94%. With carrier-envelope phase-controlled laser pulses, we show furthermore how light-field sensitive currents can be excited in monolayer graphene via an interplay of interband and intraband electron dynamics including multiple Landau-Zener transitions.

  4. Scattering of Light by Electron Wave Packets: Size Doesn't Matter

    NASA Astrophysics Data System (ADS)

    Corson, John; Glasgow, Scott; Acosta, Sebastian; Ware, Michael; Peatross, Justin

    2011-05-01

    In support of a current experiment, we investigate light scattering by individual free electrons in an intense laser focus using full second quantization. This addresses the question of whether emission from a large electron packet will be suppressed owing to interference between different parts of the packet. Textbook treatments of Compton scattering generally use exact momentum states, but packets necessarily superpose many momentum states with the possibility of quantum interference (see J. Peatross, C. Muller, K. Hatsagortsyan, and C. H. Keitel, Phys. Rev. Lett. 100, 153601, 2008). We investigate the details of this interference for both single- photon and coherent-state scattering. Kinematic constraints eliminate interference in the case of unidirectional stimulation, whether the scattering is single- or multi-photon in nature. To all orders of perturbation theory, the scattering exhibits no dependence on the relative phases of constituent momenta, and thus no dependence on wave packet size.

  5. Fraunhofer-type diffraction patterns of matter-wave scattering of projectiles: Electron transfer in energetic ion-atom collisions

    NASA Astrophysics Data System (ADS)

    Agueny, Hicham

    2015-07-01

    We present results for single and double electron captures in intermediate energies H+ and 2H+ projectiles colliding with a helium target. The processes under investigations are treated using a nonperturbative semiclassical approach in combination with Eikonal approximation to calculate the scattering differential cross sections. The latter reveals pronounced minima and maxima in the scattering angles, in excellent agreement with the recent experimental data. It turns out that the present structure depends strongly on the projectile energy and shows only slight variations with different capture channels. The observed structure demonstrates the analogy of atomic de Broglie's matter-wave scattering with λd B=1.3 -3.2 ×10-3 a.u. and Fraunhofer-type diffraction of light waves.

  6. OSIRIS Modeling of High Energy Electron Transport in Warm Dense Matter

    NASA Astrophysics Data System (ADS)

    May, J.; Yabuuchi, T.; McGuffey, C.; Wei, Ms; Beg, F.; Mori, Wb

    2016-10-01

    In experiments on the Omega EP laser, a high intensity laser beam (eA /me c > 1) is focused onto a gold foil, generating relativistic electrons. Behind the Au foil is a layer of plastic foam through which the electrons are allowed to transport, and on the far side of the CH from the gold is a copper foil; electron fluence is measured by recording the k- α from that foil. The foam layer is either pre-ionized via a shock launched from an ablator irradiated earlier with a beam perpendicular to the high intensity beam; or the foam is in the solid state when the high intensity beam is switched on. In the latter case the foam - which has an initial density of 200mg /cm3 - heats to a temperature of 40eV and rarifies to a density of 30mg /cm3 . Results show an order of magnitude decrease in k- α when the CH layer is pre-ionized compared to cold CH. OSIRIS simulations indicate that the primary explanation for the difference in transport seen in the experiment is the partial resistive collimation of the beam in the higher density material, caused by collisional resistivity. The effect seems to be mostly caused by the higher density itself, with temperature having minimal effect. The authors acknowledge the support of the Department of Energy under contract DE-NA 0001833 and the National Science Foundation under contract ACI 1339893.

  7. Effects of quantum confinement in nanoscale superconductors: From electronic density of states to vortex matter

    NASA Astrophysics Data System (ADS)

    Zhang, Lingfeng

    Due to quantum confinement, nanoscale superconductivity exhibits richer phenomena than bulk superconductivity. This will allow us to artificially design the electronic properties by changing the size and geometry of the superconductor, leading to the desired control and enhancement of superconductivity. However, the interplay between superconductivity and quantum confinement effect has not been fully understood yet. In this thesis, we theoretically investigated several aspects of nanoscale superconductivity by solving the Bogoliubov-de Gennes equations. The topics that are covered range from vortex states under the influence of quantum confinement to the electronic structure in various nano-structures. The density of states (DOS) obtained in this thesis can be compared with results from Scanning tunneling microscope (STM) experiments. In Chapter. 3 and 4, we studied vortex states under the influence of quantum confinement effect. We found that the shape resonances of the order parameter results in an additional contribution to quantum topological confinement - leading to unconventional vortex configurations. Our results reveal a plethora of asymmetric, giant multi-vortex, and vortex-antivortex structures. They are relevant for high-Tc nanograins, confined Bose-Einstein condensates, and graphene fakes with proximity-induced superconductivity. In Chapter. 5, we studied the effect of non-magnetic impurities in superconducting nanowires. We found that: 1) impurities strongly affect the transport properties, 2) the effect is impurity position-dependent, and 3) it exhibits opposite behavior for resonant and off-resonant wire widths due to the sub-band energy spectrum induced by lateral quantum confinement. These effects can be used to manipulate the Josephson current, filter electrons by subband. In Chapter. 6, we investigated the Tomasch effect on the electronic structure in nanoscale superconductors. Here it is the quasiparticle interference effect induced by an

  8. Fraunhofer diffraction of atomic matter waves: electron transfer studies with a laser cooled target.

    PubMed

    van der Poel, M; Nielsen, C V; Gearba, M A; Andersen, N

    2001-09-17

    We have constructed an apparatus combining the experimental techniques of cold target recoil ion momentum spectroscopy and a laser cooled target. We measure angle differential cross sections in Li(+)+Na-->Li+Na(+) electron transfer collisions in the keV energy regime with a momentum resolution of 0.12 a.u. yielding an order of magnitude better angular resolution than previous measurements. We resolve Fraunhofer-type diffraction patterns in the differential cross sections. Good agreement with predictions of the semiclassical impact parameter method is obtained.

  9. Characterization of Fast-Electron Beam Propagation Through Solid-Density Matter by Optical Transition Radiation

    NASA Astrophysics Data System (ADS)

    Storm, M.; Myatt, J.; Stoeckl, C.

    2006-10-01

    A diagnostic has been developed to measure the emission of optical transition radiation (OTR) produced by relativistic electrons emerging at the rear side of laser-illuminated targets. The device will be deployed in the newly completed multiterawatt (MTW) experimental facility at the University of Rochester's Laboratory for Laser Energetics. The MTW laser is capable of producing 10-J, 600-fs pulses of 1053-nm-wavelength radiation, which are focused using an f/2 off-axis parabolic mirror to intensities in excess of 10^19 Wcm-2. A 20x microscope objective with a resolution of better than 1 μm will image the OTR signal onto a CCD camera. A postprocessor to the particle-in-cell code LSP will be used to generate a simulated OTR signal from the calculated fast-electron distributions at the rear side of the target for comparison with experimental data. This talk will present the characteristics and capabilities of the OTR device along with the most recently acquired data. This work was supported by the U.S. Department of Energy Office of Inertial Confinement Fusion under Cooperative Agreement No. DE-FC52-92SF19460.

  10. Dark matter scattering on electrons: Accurate calculations of atomic excitations and implications for the DAMA and XENON experiments

    NASA Astrophysics Data System (ADS)

    Roberts, Benjamin; Dzuba, Vladimir; Flambaum, Victor; Gribakin, Gleb; Pospelov, Maxim; Stadnik, Yevgeny

    2017-01-01

    Atoms can become ionised during the scattering of a slow, heavy particle off a bound electron. Such an interaction involving leptophilic WIMP dark matter is a potential explanation for the anomalous 9 sigma annual modulation in the DAMA direct detection experiment. We show that due to non-analytic, cusp-like behavior of Coulomb functions close to the nucleus leads to an effective atomic structure enhancement. Crucially, we also show that electron relativistic effects are important. With this in mind, we perform high-accuracy relativistic calculations of atomic ionisation. We scan the parameter space: the DM mass, the mediator mass, and the effective coupling strength, to determine if there is any region that could potentially explain the DAMA signal. While we find that the modulation fraction of all events with energy deposition above 2 keV in NaI can be quite significant, reaching 50%, the relevant parts of the parameter space are excluded by the XENON10 and XENON100 experiments.

  11. Constraining the Cosmic Ray Electron Distribution and the Halo Dark Matter from the High Energy Gamma-Ray Background

    NASA Astrophysics Data System (ADS)

    Chary, R.; Wright, E. L.

    2000-10-01

    We present an independent estimate of the high latitude (|b|>20 deg) contribution to the E>30 MeV gamma-ray background from Galactic nucleon-nucleon, electron bremsstrahlung and inverse Compton processes. In particular, the inverse Compton contribution has been estimated for different cosmic ray electron distributions and after factoring in the anisotropy in the interstellar radiation field and the anisotropic Klein-Nishina scattering cross section. We find that the emission from the inverse Compton process when the anisotropy in the radiation field is included can be higher by up to 50% when compared to estimates that adopt an isotropic radiation field. Simulated inverse Compton maps with a cosmic ray electron distribution represented by a ``pill box'' extending up to a distance of 5 kpc above the Galactic plane provide better fits to the EGRET intensity maps suggesting that the cosmic ray halo may be larger than previously thought. Fitting for the Galactic components of gamma-ray emission confirms the existence of an isotropic component with an intensity that can be represented by the form 27.7*(E/MeV)-2.16 ph m-2 s-1 sr-1 MeV-1, in excellent agreement with previous estimates. The spectrum of the isotropic component further argues strongly in favor of unresolved gamma-ray blazars being the source of this emission. Introduction of an anisotropic component improves the quality of the fits. However, this component, which could potentially arise from the dark matter in the Galactic halo, is not well characterized by a single power law which might be associated with any single dark matter candidate. It has an intensity of about a third of the isotropic background above E > 100 MeV at the level of 3*10-2 ph m-2 s-1 sr-1. The best fit power law spectrum to this component has a photon index of -1.7. Based on the intensity and spectrum of the anisotropic component we derive upper limits of 109Msun for the mass of cold, baryonic gas within the solar circle and a primordial

  12. Ultrawide electrical tuning of light matter interaction in a high electron mobility transistor structure

    PubMed Central

    Pal, Shovon; Nong, Hanond; Markmann, Sergej; Kukharchyk, Nadezhda; Valentin, Sascha R.; Scholz, Sven; Ludwig, Arne; Bock, Claudia; Kunze, Ulrich; Wieck, Andreas D.; Jukam, Nathan

    2015-01-01

    The interaction between intersubband resonances (ISRs) and metamaterial microcavities constitutes a strongly coupled system where new resonances form that depend on the coupling strength. Here we present experimental evidence of strong coupling between the cavity resonance of a terahertz metamaterial and the ISR in a high electron mobility transistor (HEMT) structure. The device is electrically switched from an uncoupled to a strongly coupled regime by tuning the ISR with epitaxially grown transparent gate. The asymmetric potential in the HEMT structure enables ultrawide electrical tuning of ISR, which is an order of magnitude higher as compared to an equivalent square well. For a single heterojunction with a triangular confinement, we achieve an avoided splitting of 0.52 THz, which is a significant fraction of the bare intersubband resonance at 2 THz. PMID:26578287

  13. Electron Paramagnetic Resonance: a tool for in situ detection, imaging and dating of biosignatures in primitive organic matter

    NASA Astrophysics Data System (ADS)

    Gourier, D.; Binet, L.; Vezin, H.

    2012-04-01

    Electron Paramagnetic Resonance (EPR) spectroscopy and imaging are based on the interaction of a microwave electromagnetic field (typically in the GHz range) with electron spins in presence of an external magnetic field. Contrary to UV-visible and Infrared light, microwave radiation can penetrate in most non conducting materials, so that EPR is sensitive to the bulk (and not to the surface) of samples. All the paramagnetic defects, impurities, point defects in the mineral matrix, radicals in carbonaceous matter of an ancient rock can be detected by this technique. As the most ancient traces of life, as old as 3.5 Gy, are recorded as carbonaceous microstructures in siliceous sedimentary structures (cherts), the radical defects of these microstructures can be probed in situ without sample preparation. By using continuous-wave EPR, the fossilized carbonaceous matter can be mapped at the sub-millimeter scale (EPR imaging)[1], and can be dated with respect to the host rock (evolution of the EPR lineshape)[2]. Thus this method could be used for contamination detection (endolithic bacteria, infiltration etc…). By using pulsed-EPR spectroscopy (instead of continuous wave), nuclear magnetic transitions of elements in and around radicals can be detected with a high resolution and sensitivity. We show that specific nuclear transitions for hydrogen (1H and 2D) and 13C (and other nuclei such as 29Si and 31P) can be identified in extraterrestrial carbonaceous matter (meteorites) and in Precambrian and younger cherts. These pulsed techniques provide molecular scale biosignatures for primitive life detection and internal probes to study the history of organic matter in the early solar system [3,4]. Paramagnetic biosignatures are not limited to the organic component of cherts. Specific EPR biosignatures of metal ions can be detected in biominerals such as MnO2 [5] or in molecular V4+ complexes [6]. EPR is thus a potential technique for the search of primitive life on Earth and

  14. CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES: Properties of Graphene Based Parametric Pump

    NASA Astrophysics Data System (ADS)

    Luo, Song-Lin; Wei, Ya-Dong

    2009-11-01

    The adiabatic parametric electron pump of the infinite zigzag graphene ribbons and the infinite armchair graphene ribbons is investigated by the tight binding method. The pumping signals are added by two gates around the ribbons. It is shown that the dc current can be pumped out by cyclically varying the two gate voltages and the pumped current strongly depends on the driving frequency, the pumping amplitude and the phase difference of the gate voltages. The pumped current is mediated by the graphene energy levels and its peaks occur around the energies where transmission coefficients and density of states are large. The pump current may give one peak or two opposite peaks corresponding to each transmission peak or transmission pair peaks. The height and width of the current peaks increase with the amplitude of the pumping driving voltages. The pumped current is antisymmetric about the phase difference varphi = π and for small pumping amplitude the pumped current is a sinusoidal function of the phase difference. Some graphene ribbons, although with different widths, have very similar contours of the transmission coefficients and give the same pumped current figures.

  15. Astrocyte subtypes in the gray matter of injured human cerebral cortex: a transmission electron microscope study.

    PubMed

    Castejón, O J

    1999-04-01

    Astrocytic subtypes in different cortical regions of injured human cerebral cortex of 22 patients with brain trauma, vascular anomalies and brain tumours have been examined by means of light microscopy and conventional transmission electron microscopy. The cortical biopsies of frontal, parietal and temporal cortex were examined to analyse the heterogeneous astrocytic response and characterize astrocytic population subtypes. Swollen clear and dense astrocytes, glycogen rich- and glycogen-depleted astrocytes, aged or lipofucsin rich-astrocytes and reactive, dark, hypertrophic astrocytes were identified. Clear and dense astrocytes displayed bundles of glial filaments and dense inclusion bodies. Glycogen-rich astrocytes exhibited an accumulation of beta type of monogranular glycogen granules, which disappear in the glycogen-depleted astrocytes, suggesting anoxic mobilization of glycogen stores during ischemia or anoxia. Lipofucsin rich astrocytes were mainly related with ageing processes, although their presence in young patients suggests also an injured related process. Dark astrocytes with phagocytic properties were found. They exhibited bundles of glial filaments. The astrocytic response depended upon the nature of cortical insult, extent of damage, time course of pathological lesion and affected cortical region.

  16. Biologically Inspired Electronic, Photovoltaic and Microfluidic Devices Based on Aqueous Soft Matter

    NASA Astrophysics Data System (ADS)

    Koo, Hyung Jun

    Hydrogels are a water-based soft material where three dimensional networks of hydrophilic polymer retain large amounts of water. We developed hydrogel based devices with new functionalities inspired by materials, structures and processes in nature. The advantages, such as softness, biocompatibility and high ionic conductivity, could enable hydrogels to be novel materials for biomimetic devices operated by ionic current. Moreover, microfluidic patterns are easily embedded in moldable hydrogels and allow for unique convective/diffusive transport mechanism in porous gel to be used for uniform delivery of reagent solution. We first developed and characterized a device with unidirectional ionic current flow across a SiO2/Gel junction, which showed highly efficient rectification of the ionic current by non-linear conductivity of SiO2 films. Addition of polyelectrolytes and salt to the gel layer significantly improved the performance of the new diode device because of the enhanced gel conductance. A soft matter based diode composed of hydrogel and liquid metal (eutectic gallium indium, EGaIn) was also presented. The ability to control the thickness, and thus resistivity, of an insulating oxide skin on the metal enables the current rectification. The effect of ionic conductivity and pH on the formation of the insulating oxide was investigated in a simple model system with liquid metal/electrolyte solution or hydrogel/Pt interfaces. Finally, we present a diode composed entirely of soft materials by replacing the platinum electrode with a second liquid metal electrode. A new type of hydrogel-based photovoltaic systems (HGPVs) was constructed. Two photosensitive ionized molecules embedded in aqueous gel served as photoactive species. The HGPVs showed performance comparable with or higher than those of some other biomimetic or ionic photovoltaic systems reported recently. We suggest a provisional mechanism of the device operation, based on a synergetic effect of the two dye

  17. CKD screening and management in the Veterans Health Administration: the impact of system organization and an innovative electronic record.

    PubMed

    Patel, Thakor G; Pogach, Leonard M; Barth, Robert H

    2009-03-01

    At the beginning of this decade, Healthy People 2010 issued a series of objectives to "reduce the incidence, morbidity, mortality and health care costs of chronic kidney disease." A necessary feature of any program to reduce the burden of kidney disease in the US population must include mechanisms to screen populations at risk and institute early the aspects of management, such as control of blood pressure, management of diabetes, and, in patients with advanced chronic kidney disease (CKD), preparation for dialysis therapy and proper vascular access management, that can retard CKD progression and improve long-term outcome. The Department of Veterans Affairs and the Veterans Health Administration is a broad-based national health care system that is almost uniquely situated to address these issues and has developed a number of effective approaches using evidence-based clinical practice guidelines, performance measures, innovative use of a robust electronic medical record system, and system oversight during the past decade. In this report, we describe the application of this systems approach to the prevention of CKD in veterans through the treatment of risk factors, identification of CKD in veterans, and oversight of predialysis and dialysis care. The lessons learned and applicability to the private sector are discussed.

  18. CHARACTERIZATION OF PARTICULATE MATTER FROM PHOENIX, ARIZONA, USING RAY FLUORESCENCE AND COMPUTER-CONTROLLED SCANNING ELECTRON MICROSCOPY

    EPA Science Inventory

    Numerous epidemiological studies have found associations between airborne particulate matter measured at community monitors and increased mortality and morbidity. Chemical and physical characteristics of particulate matter (e.g., elemental composition, size) and source identifi...

  19. Two-dimensional electron gas in the regime of strong light-matter coupling: Dynamical conductivity and all-optical measurements of Rashba and Dresselhaus coupling

    NASA Astrophysics Data System (ADS)

    Yudin, Dmitry; Shelykh, Ivan A.

    2016-10-01

    A nonperturbative interaction of an electronic system with a laser field can substantially modify its physical properties. In particular, in two-dimensional (2D) materials with a lack of inversion symmetry, the achievement of a regime of strong light-matter coupling allows direct optical tuning of the strength of the Rashba spin-orbit interaction (SOI). Capitalizing on these results, we build a theory of the dynamical conductivity of a 2D electron gas with both Rashba and Dresselhaus SOIs coupled to an off-resonant high-frequency electromagnetic wave. We argue that strong light-matter coupling modifies qualitatively the dispersion of the electrons and can be used as a powerful tool to probe and manipulate the coupling strengths and adjust the frequency range where optical conductivity is essentially nonzero.

  20. Characterization of leaf-level particulate matter for an industrial city using electron microscopy and X-ray microanalysis.

    PubMed

    Sgrigna, G; Baldacchini, C; Esposito, R; Calandrelli, R; Tiwary, A; Calfapietra, C

    2016-04-01

    This study reports application of monitoring and characterization protocol for particulate matter (PM) deposited on tree leaves, using Quercus ilex as a case study species. The study area is located in the industrial city of Terni in central Italy, with high PM concentrations. Four trees were selected as representative of distinct pollution environments based on their proximity to a steel factory and a street. Wash off from leaves onto cellulose filters were characterized using scanning electron microscopy and energy dispersive X-ray spectroscopy, inferring the associations between particle sizes, chemical composition, and sampling location. Modeling of particle size distributions showed a tri-modal fingerprint, with the three modes centered at 0.6 (factory related), 1.2 (urban background), and 2.6μm (traffic related). Chemical detection identified 23 elements abundant in the PM samples. Principal component analysis recognized iron and copper as source-specific PM markers, attributed mainly to industrial and heavy traffic pollution respectively. Upscaling these results on leaf area basis provided a useful indicator for strategic evaluation of harmful PM pollutants using tree leaves.

  1. Low energy electron and nuclear recoil thresholds in the DRIFT-II negative ion TPC for dark matter searches

    NASA Astrophysics Data System (ADS)

    Burgos, S.; Daw, E.; Forbes, J.; Ghag, C.; Gold, M.; Hagemann, C.; Kudryavtsev, V. A.; Lawson, T. B.; Loomba, D.; Majewski, P.; Muna, D.; Murphy, A. St. J.; Paling, S. M.; Petkov, A.; Plank, S. J. S.; Robinson, M.; Sanghi, N.; Snowden-Ifft, D. P.; Spooner, N. J. C.; Turk, J.; Tziaferi, E.

    2009-04-01

    Understanding the ability to measure and discriminate particle events at the lowest possible energy is an essential requirement in developing new experiments to search for weakly interacting massive particle (WIMP) dark matter. In this paper we detail an assessment of the potential sensitivity below 10 keV in the 1 m3 DRIFT-II directionally sensitive, low pressure, negative ion time projection chamber (NITPC), based on event-by-event track reconstruction and calorimetry in the multiwire proportional chamber (MWPC) readout. By application of a digital smoothing polynomial it is shown that the detector is sensitive to sulfur and carbon recoils down to 2.9 and 1.9 keV respectively, and 1.2 keV for electron induced events. The energy sensitivity is demonstrated through the 5.9 keV gamma spectrum of 55Fe, where the energy resolution is sufficient to identify the escape peak. The effect of a lower energy sensitivity on the WIMP exclusion limit is demonstrated. In addition to recoil direction reconstruction for WIMP searches this sensitivity suggests new prospects for applications also in KK axion searches.

  2. Probing local and electronic structure in Warm Dense Matter: single pulse synchrotron x-ray absorption spectroscopy on shocked Fe

    PubMed Central

    Torchio, Raffaella; Occelli, Florent; Mathon, Olivier; Sollier, Arnaud; Lescoute, Emilien; Videau, Laurent; Vinci, Tommaso; Benuzzi-Mounaix, Alessandra; Headspith, Jon; Helsby, William; Bland, Simon; Eakins, Daniel; Chapman, David; Pascarelli, Sakura; Loubeyre, Paul

    2016-01-01

    Understanding Warm Dense Matter (WDM), the state of planetary interiors, is a new frontier in scientific research. There exists very little experimental data probing WDM states at the atomic level to test current models and those performed up to now are limited in quality. Here, we report a proof-of-principle experiment that makes microscopic investigations of materials under dynamic compression easily accessible to users and with data quality close to that achievable at ambient. Using a single 100 ps synchrotron x-ray pulse, we have measured, by K-edge absorption spectroscopy, ns-lived equilibrium states of WDM Fe. Structural and electronic changes in Fe are clearly observed for the first time at such extreme conditions. The amplitude of the EXAFS oscillations persists up to 500 GPa and 17000 K, suggesting an enduring local order. Moreover, a discrepancy exists with respect to theoretical calculations in the value of the energy shift of the absorption onset and so this comparison should help to refine the approximations used in models. PMID:27246145

  3. Probing local and electronic structure in Warm Dense Matter: single pulse synchrotron x-ray absorption spectroscopy on shocked Fe

    NASA Astrophysics Data System (ADS)

    Torchio, Raffaella; Occelli, Florent; Mathon, Olivier; Sollier, Arnaud; Lescoute, Emilien; Videau, Laurent; Vinci, Tommaso; Benuzzi-Mounaix, Alessandra; Headspith, Jon; Helsby, William; Bland, Simon; Eakins, Daniel; Chapman, David; Pascarelli, Sakura; Loubeyre, Paul

    2016-06-01

    Understanding Warm Dense Matter (WDM), the state of planetary interiors, is a new frontier in scientific research. There exists very little experimental data probing WDM states at the atomic level to test current models and those performed up to now are limited in quality. Here, we report a proof-of-principle experiment that makes microscopic investigations of materials under dynamic compression easily accessible to users and with data quality close to that achievable at ambient. Using a single 100 ps synchrotron x-ray pulse, we have measured, by K-edge absorption spectroscopy, ns-lived equilibrium states of WDM Fe. Structural and electronic changes in Fe are clearly observed for the first time at such extreme conditions. The amplitude of the EXAFS oscillations persists up to 500 GPa and 17000 K, suggesting an enduring local order. Moreover, a discrepancy exists with respect to theoretical calculations in the value of the energy shift of the absorption onset and so this comparison should help to refine the approximations used in models.

  4. Exploring soft matter with x-rays: from the discovery of the DNA structure to the challenges of free electron lasers.

    PubMed

    Zanchetta, Giuliano; Cerbino, Roberto

    2010-08-18

    X-rays have long been a precious tool for the study of the structure of matter. While the short wavelength makes them ideal for investigating materials down to the atomic scale, their high penetration power allows for the exploration of opaque samples at a multitude of length scales. We give an overview of the x-ray techniques suited for the characterization of soft matter and of their application to systems of current interest. We describe the advantages and limitations of existing x-ray methods and outline the possible developments following the introduction of a new kind of coherent source: the x-ray free electron laser.

  5. 78 FR 77171 - Proposed Disposal of George H.W. Bush and Clinton Administration Electronic Backup Tapes

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-12-20

    ... Administration Disaster Recovery Backup Tapes; final agency action. SUMMARY: The National Archives and Records Administration (NARA) is issuing this final notice to dispose of a collection of disaster recovery backup tapes... notice of proposed disposal of this collection of disaster recovery backup tapes was published in...

  6. The Institute of Public Administration's Document Center: From Paper to Electronic Records--A Full Image Government Documents Database.

    ERIC Educational Resources Information Center

    Al-Zahrani, Rashed S.

    Since its establishment in 1960, the Institute of Public Administration (IPA) in Riyadh, Saudi Arabia has had responsibility for documenting Saudi administrative literature, the official publications of Saudi Arabia, and the literature of regional and international organizations through establishment of the Document Center in 1961. This paper…

  7. 48 CFR 204.270 - Electronic Document Access.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 48 Federal Acquisition Regulations System 3 2010-10-01 2010-10-01 false Electronic Document Access..., DEPARTMENT OF DEFENSE GENERAL ADMINISTRATIVE MATTERS Contract Distribution 204.270 Electronic Document Access. Follow the procedures at PGI 204.270 relating to obtaining an account in the Electronic Document...

  8. 48 CFR 204.270 - Electronic Document Access.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 48 Federal Acquisition Regulations System 3 2011-10-01 2011-10-01 false Electronic Document Access..., DEPARTMENT OF DEFENSE GENERAL ADMINISTRATIVE MATTERS Contract Distribution 204.270 Electronic Document Access. Follow the procedures at PGI 204.270 relating to obtaining an account in the Electronic Document...

  9. Real-Time Cell-Electronic Sensing of Coal Fly Ash Particulate Matter for Toxicity-Based Air Quality Monitoring.

    PubMed

    Moe, Birget; Yuan, Chungang; Li, Jinhua; Du, Haiying; Gabos, Stephan; Le, X Chris; Li, Xing-Fang

    2016-06-20

    The development of a unique bioassay for cytotoxicity analysis of coal fly ash (CFA) particulate matter (PM) and its potential application for air quality monitoring is described. Using human cell lines, A549 and SK-MES-1, as live probes on microelectrode-embedded 96-well sensors, impedance changes over time are measured as cells are treated with varying concentrations (1 μg/mL-20 mg/mL) of CFA samples. A dose-dependent impedance change is determined for each CFA sample, from which an IC50 histogram is obtained. The assay was successfully applied to examine CFA samples collected from three coal-fired power plants (CFPs) in China. The samples were separated into three size fractions: PM2.5 (<2.5 μm), PM10-2.5 (2.5 μm < x < 10 μm), and PM10 (>10 μm). Dynamic cell-response profiles and temporal IC50 histograms of all samples show that CFA cytotoxicity depends on concentration, exposure time (0-60 h), and cell-type (SK-MES-1 > A549). The IC50 values differentiate the cytotoxicity of CFA samples based on size fraction (PM2.5 ≈ PM10-2.5 ≫ PM10) and the sampling location (CFP2 > CFP1 ≈ CFP3). Differential cytotoxicity measurements of particulates in human cell lines using cell-electronic sensing provide a useful tool for toxicity-based air quality monitoring and risk assessment.

  10. Database Administrator

    ERIC Educational Resources Information Center

    Moore, Pam

    2010-01-01

    The Internet and electronic commerce (e-commerce) generate lots of data. Data must be stored, organized, and managed. Database administrators, or DBAs, work with database software to find ways to do this. They identify user needs, set up computer databases, and test systems. They ensure that systems perform as they should and add people to the…

  11. An evaluation process for an electronic bar code medication administration information system in an acute care unit.

    PubMed

    Bargren, Michelle; Lu, Der-Fa

    2009-01-01

    The purpose of this case study is to present an evaluation process and recommendations for addressing the gaps found with the implementation of a new bar code medication administration (BCMA) technology in a busy acute care hospital unit. The case study analyzes workflow procedures associated with administration of medications in an inpatient labor and delivery care unit before and one year after implementation of BCMA technology. The comparison reveals a twofold increase in workflow procedures for nursing staff because of the new technology. System gaps are identified from a nursing user's perspective, and recommendations are offered to close those gaps.

  12. Electron-ion and ion-ion potentials for modeling warm dense matter: Applications to laser-heated or shock-compressed Al and Si.

    PubMed

    Dharma-wardana, M W C

    2012-09-01

    The pair interactions Uij(r) determine the thermodynamics and linear transport properties of matter via the pair-distribution functions (PDFs), i.e., gij(r). Great simplicity is achieved if Uij(r) could be directly used to predict material properties via classical simulations, avoiding many-body wave functions. Warm dense matter (WDM) is encountered in quasiequilibria where the electron temperature Te differs from the ion temperature Ti, as in laser-heated or in shock-compressed matter. The electron PDFs gee(r) as perturbed by the ions are used to evaluate fully nonlocal exchange-correlation corrections to the free energy, using hydrogen as an example. Electron-ion potentials for ions with a bound core are discussed with Al and Si as examples, for WDM with Te≠Ti, and valid for times shorter than the electron-ion relaxation time. In some cases the potentials develop attractive regions and then become repulsive and "Yukawa-like" for higher Te. These results clarify the origin of initial phonon hardening and rapid release. Pair potentials for shock-heated WDM show that phonon hardening would not occur in most such systems. Defining meaningful quasiequilibrium static transport coefficients consistent with the dynamic values is addressed. There seems to be no meaningful "static conductivity" obtainable by extrapolating experimental or theoretical σ(ω,Ti,Te) to ω→0, unless Ti→Te as well. Illustrative calculations of quasistatic resistivities R(Ti,Te) of laser-heated as well as shock-heated aluminum and silicon are presented using our pseudopotentials, pair potentials, and classical integral equations. The quasistatic resistivities display clear differences in their temperature evolutions, but are not the strict ω→0 limits of the dynamic values.

  13. CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES: Electric-Current-Induced Heat Generation in Kondo Regime

    NASA Astrophysics Data System (ADS)

    Chen, Qiao; Zhang, Ya-Min

    2010-07-01

    Using the nonequilibrium Green's function technique, we investigate the current induced heat generation in Kondo regime. The Kondo effect influences the heat generation significantly. In the curve of heat generation versus the bias, a negative differential of the heat generation is exhibited. The symmetry of the heat generation is destroyed by the strong electron-electron interaction and the electron-phonon interaction.

  14. Identifying the source of super-high energetic electrons in the presence of pre-plasma in laser-matter interaction at relativistic intensities

    NASA Astrophysics Data System (ADS)

    Wu, D.; Krasheninnikov, S. I.; Luan, S. X.; Yu, W.

    2017-01-01

    The generation of super-high energetic electrons influenced by pre-plasma in relativistic intensity laser-matter interaction is studied in a one-dimensional slab approximation with particle-in-cell simulations. Different pre-plasma scale lengths and laser intensities are considered, showing an increase in both particle number and cut-off kinetic energy of electrons with the increase of pre-plasma scale length and laser intensity, the cut-off kinetic energy greatly exceeding the corresponding laser ponderomotive energy. A two-stage electron acceleration model is proposed to explain the underlying physics. The first stage is attributed to the synergetic acceleration by longitudinal electric field and counter-propagating laser pulses, and a scaling law is obtained with efficiency depending on the pre-plasma scale length and laser intensity. These electrons pre-accelerated in the first stage could build up an intense electrostatic potential barrier with maximal value several times as large as the initial electron kinetic energy. Some of the energetic electrons could be further accelerated by reflection off the electrostatic potential barrier, with their finial kinetic energies significantly higher than the values pre-accelerated in the first stage.

  15. SPiRIT-TPC with GET readout electronics for the study of density dependent symmetry energy of high dense matter with Heavy RI collisions

    NASA Astrophysics Data System (ADS)

    Isobe, Tadaaki; SPiRIT Collaboration

    2014-09-01

    The nuclear Equation of State (EoS) is a fundamental property of nuclear matter that describes the relationships between the parameters for a nuclear system, such as energy, density and temperature. An international collaboration, named SPiRIT, to study the nuclear EoS has been formed recently. One of the main devices of experimental setup is a Time Projection Chamber (TPC) which will be installed into the SAMURAI dipole magnet at RIKEN-RIBF. The TPC can measure charged pions, protons and light ions simultaneously in heavy RI collisions, and those will be used as probes to study the asymmetric dense nuclear matter. In addition to the status of the SPiRIT project, testing of SPiRIT-TPC with GET electronics will be presented in this talk. GET, general electronics for TPC, is a project for the development of novel electronics for TPC supported by NSF and ANR. This work is supported in part by the Japan Grant-in-Aide award and the US DOE grant DE-SC0004835 and JUSEIPEN.

  16. CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES: Spin-dependent electron transport of a waveguide with Rashba spin-orbit coupling in an electromagnetic field

    NASA Astrophysics Data System (ADS)

    Xiao, Xian-Bo; Li, Xiao-Mao; Chen, Yu-Guang

    2009-12-01

    We investigate theoretically the spin-dependent electron transport in a straight waveguide with Rashba spin-orbit coupling (SOC) under the irradiation of a transversely polarized electromagnetic (EM) field. Spin-dependent electron conductance and spin polarization are calculated as functions of the emitting energy of electrons or the strength of the EM field by adopting the mode matching approach. It is shown that the spin polarization can be manipulated by external parameters when the strength of Rashba SOC is strong. Furthermore, a sharp step structure is found to exist in the total electron conductance. These results can be understood by the nontrivial Rashba subbands intermixing and the electron intersubband transition when a finite-range transversely polarized EM field irradiates a straight waveguide.

  17. High-Sensitivity Nuclear Magnetic Resonance at Giga-Pascal Pressures: A New Tool for Probing Electronic and Chemical Properties of Condensed Matter under Extreme Conditions

    PubMed Central

    Meier, Thomas; Haase, Jürgen

    2014-01-01

    Nuclear Magnetic Resonance (NMR) is one of the most important techniques for the study of condensed matter systems, their chemical structure, and their electronic properties. The application of high pressure enables one to synthesize new materials, but the response of known materials to high pressure is a very useful tool for studying their electronic structure and developing theories. For example, high-pressure synthesis might be at the origin of life; and understanding the behavior of small molecules under extreme pressure will tell us more about fundamental processes in our universe. It is no wonder that there has always been great interest in having NMR available at high pressures. Unfortunately, the desired pressures are often well into the Giga-Pascal (GPa) range and require special anvil cell devices where only very small, secluded volumes are available. This has restricted the use of NMR almost entirely in the past, and only recently, a new approach to high-sensitivity GPa NMR, which has a resonating micro-coil inside the sample chamber, was put forward. This approach enables us to achieve high sensitivity with experiments that bring the power of NMR to Giga-Pascal pressure condensed matter research. First applications, the detection of a topological electronic transition in ordinary aluminum metal and the closing of the pseudo-gap in high-temperature superconductivity, show the power of such an approach. Meanwhile, the range of achievable pressures was increased tremendously with a new generation of anvil cells (up to 10.1 GPa), that fit standard-bore NMR magnets. This approach might become a new, important tool for the investigation of many condensed matter systems, in chemistry, geochemistry, and in physics, since we can now watch structural changes with the eyes of a very versatile probe. PMID:25350694

  18. High-sensitivity nuclear magnetic resonance at Giga-Pascal pressures: a new tool for probing electronic and chemical properties of condensed matter under extreme conditions.

    PubMed

    Meier, Thomas; Haase, Jürgen

    2014-10-10

    Nuclear Magnetic Resonance (NMR) is one of the most important techniques for the study of condensed matter systems, their chemical structure, and their electronic properties. The application of high pressure enables one to synthesize new materials, but the response of known materials to high pressure is a very useful tool for studying their electronic structure and developing theories. For example, high-pressure synthesis might be at the origin of life; and understanding the behavior of small molecules under extreme pressure will tell us more about fundamental processes in our universe. It is no wonder that there has always been great interest in having NMR available at high pressures. Unfortunately, the desired pressures are often well into the Giga-Pascal (GPa) range and require special anvil cell devices where only very small, secluded volumes are available. This has restricted the use of NMR almost entirely in the past, and only recently, a new approach to high-sensitivity GPa NMR, which has a resonating micro-coil inside the sample chamber, was put forward. This approach enables us to achieve high sensitivity with experiments that bring the power of NMR to Giga-Pascal pressure condensed matter research. First applications, the detection of a topological electronic transition in ordinary aluminum metal and the closing of the pseudo-gap in high-temperature superconductivity, show the power of such an approach. Meanwhile, the range of achievable pressures was increased tremendously with a new generation of anvil cells (up to 10.1 GPa), that fit standard-bore NMR magnets. This approach might become a new, important tool for the investigation of many condensed matter systems, in chemistry, geochemistry, and in physics, since we can now watch structural changes with the eyes of a very versatile probe.

  19. 75 FR 51842 - In the Matter of Certain Electronic Paper Towel Dispensing Devices and Components Thereof; Notice...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-08-23

    ... Certain Electronic Paper Towel Dispensing Devices and Components Thereof; Notice of Commission... for importation, and the sale within the United States after importation of certain electronic paper towel dispensing devices and components thereof by reason of infringement of certain claims of...

  20. Quality of Book-Reading Matters for Emergent Readers: An Experiment with the Same Book in Regular or Electronic Format.

    ERIC Educational Resources Information Center

    de Jong, Maria T.; Bus, Adriana G.

    2002-01-01

    An adult read to 12 children from a regular paper book. Twenty-four children explored a similar electronic book. For half of this group, the electronic book was with and for half without restrictions on games. Regular book format was more supportive of learning story content and phrasing; both formats supported internalization of features of…

  1. CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES: Wave-Vector and Temperature-Dependent Electron Transport in a Magnetic Nanostructure Modulated by Bias

    NASA Astrophysics Data System (ADS)

    Lu, Jian-Duo; Li, Yun-Bao; Wang, Yu-Hua; Hou, Yang-Lai

    2010-08-01

    We theoretically investigate the wave-vector and temperature-dependent electron transport in a magnetic nanostructure modulated by an applied bias. The large spin-polarization can be achieved in such a device, and the degree of spin-polarization strongly depends on the transverse wave-vector and the temperature. These interesting properties may be helpful to spin-polarize electrons into semiconductors, and this device may be used as a spin filter.

  2. One electron oxidation potential as a predictor of rate constants of N-containing compounds with carbonate radical and triplet excited state organic matter.

    PubMed

    Arnold, William A

    2014-04-01

    Photo-generated transient species, such as the carbonate radical and triplet excited state natural organic matter, mediate the oxidation of pollutants in various sunlit or artificially irradiated systems. In this work, one-electron oxidation potentials for 70 nitrogen-containing compounds were computed, and literature data were used to develop quantitative structure-activity relationships (QSARs) for prediction of the second order reaction rate constants with these two oxidants. For carbonate radical, separate QSARs were necessary for compounds with and without resonance stabilization of the resulting radical, and predicted rate constants were, on average, within a factor of three of experimental values. With the limited data set available, results suggest that one-electron oxidation potential is also a viable descriptor variable for predictions of rate constants with triplet excited states.

  3. INTERACTION OF LASER RADIATION WITH MATTER. LASER PLASMA: Mechanism of high-energy electron production in a laser plasma

    NASA Astrophysics Data System (ADS)

    Belyaev, V. S.

    2004-01-01

    A mechanism of high-energy electron production in the interaction of high-intensity short laser pulses with a solid target is proposed and analysed. The theoretical dependences of fast-electron kinetic energy on the parameters of laser radiation and target material are given. The effect of ionisation of the target material is considered. The generation of ultrastrong magnetic fields in the laser plasma is shown to play the key part in the formation, transfer, and acceleration of electron beams. This results in the production of vortex electric fields accelerating electrons. The theoretical dependences yield well-proved limits for the electron energy and are in good agreement with the results of experiments performed on high-intensity laser setups, including the results obtained with participation of the author.

  4. Leadership Matters: Supporting Administrators through First Year Implementation of a Standards-Based Evaluation System in a Small Urban School District

    ERIC Educational Resources Information Center

    Esmont, Leah W.

    2014-01-01

    Education policymakers at the national level have initiated reforms in K-12 education for that past several years that have focused on teacher quality and teacher evaluation. More recently, reforms have included legislation that focuses on administrator quality as well. Included in far-reaching recent legislation in Arizona is a requirement that…

  5. Optimization of route of administration for coexposure to ovalbumin and particle matter to induce adjuvant activity in respiratory allergy in the mouse.

    PubMed

    Steerenberg, P A; van Dalen, W J; Withagen, C E T; Dormans, J A M A; van Loveren, H

    2003-11-01

    Epidemiological and experimental studies have not only shown that air pollution induces increased pulmonary morbidity, and mortality, but also that air pollution components may potentiate allergic responses. The respiratory allergy model to ovalbumin in the mouse has been shown a useful tool to characterize the adjuvant potency of air pollution components. However, the choice for the most effective route of administration for testing small amounts of air pollution component is hampered by the diversity of routes of administration used. To test the adjuvant activity of airborne particles (Ottawa dust EHC-93), we studied the optimal route of respiratory administration: intranasally (in) and aerosol (aero) in comparison with responses observed by intraperitoneal (ip) with diesel exhaust particles (DEP) as a positive control. Our results show that the combination of in/aero with ovalbumin caused almost similar immunoglobulin (Ig)E and inflammatory responses compared to the ip/aero. In/in application induced less responses for IgE, less inflammation in the lung, and less increased numbers of eosinophils in the bronchoalveolar lavage (BAL). This response increased dramatically when ovalbumin was coadministered with DEP. Subsequently, EHC-93, which is made up of airborne particles, was tested via the in/in route of administration. EHC-93 induced similar IgE responses, inflammation, and eosinophilic response in BAL compared to DEP. In addition, EHC-93 increased the airway responsiveness of the ovalbumin-sensitized mice measured in unrestrained condition and not in nonsensitized control mice. It is concluded that intranasal sensitization with intranasal challenge with airborne particles (EHC-93) is an effective route of administration to show potency of adjuvant activity of airborne particles.

  6. CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES: Two Electrons with Spin-Orbit Interactions in InAs Coupled Quantum Dots

    NASA Astrophysics Data System (ADS)

    Zhao, Nan; Xu, Dong; Zhu, Jia-Lin

    2010-02-01

    We theoretically study the spin properties of two interacting electrons confined in the InAs parallel coupled quantum dots (CQDs) with spin-orbit interactions (SOI) by exact diagonalization method. Through the SOI induced spin mixing of the singlet and the triplet states, we show the different spin properties for the weak and strong SOI. We investigate the coherent singlet-triplet spin oscillations of the two electrons under the SOI, and demonstrate the detailed behaviors of the spin oscillations depending on the SOI strengths, the inter-dot separations and the external magnetic fields. To better understand the underlying physics of the spin dynamics, we introduce a four-level model Hamiltonian for both weak and strong SOI, and find that the SOI induced in plane effective magnetic fields can be quantitatively extracted from the two-electron excitation energy spectra.

  7. CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES: Spin-Dependent Electron Properties of a Triple-Terminal Quantum Dot Structure

    NASA Astrophysics Data System (ADS)

    Han, Yu; Gong, Wei-Jiang; Wei, Guo-Zhu

    2009-12-01

    Electron transport properties of a triple-terminal Aharonov-Bohm interferometer are theoretically studied. By applying a Rashba spin-orbit coupling to a quantum dot locally, we find that remarkable spin polarization comes about in the electron transport process with tuning the structure parameters, i.e., the magnetic flux or quantum dot levels. When the quantum dot levels are aligned with the Fermi level, there only appear spin polarization in this structure by the presence of an appropriate magnetic flux. However, in absence of magnetic flux spin polarization and spin separation can be simultaneously realized with the adjustment of quantum dot levels, namely, an incident electron from one terminal can select a specific terminal to depart from the quantum dots according to its spin state.

  8. 76 FR 54496 - In the Matter of Certain Electronic Devices Having a Digital Television Receiver and Components...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-09-01

    .... The Commission's notice of investigation named the following respondents: Sony Corporation of Japan; Sony Corporation of America of New York, New York; and Sony Electronics, Inc. of San Diego,...

  9. CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES: Suppression of Anti-resonant Effect in Presence of Band Overlap

    NASA Astrophysics Data System (ADS)

    Xiong, Gang

    2010-07-01

    By exact resolution of coupled ideal chains connecting an extra side site, we show that the so-called "anti-resonant effect" is suppressed when the electron energy is inside the overlap region of extended bands of the ideal tight-binding chains. When the electronic energy is outside the band overlap region, the existence of "anti-resonant effect" is tuned by details of local connectivity around the extra side site and can be suppressed by introduction of magnetic flux.

  10. CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES: Electronic states of InAs/GaAs tyre-shape quantum ring

    NASA Astrophysics Data System (ADS)

    Wang, Chuan-Dao; Yang, Fu-Hua; Feng, Song-Lin

    2008-08-01

    In the framework of the effective mass theory, this paper calculates the electron energy levels of an InAs/GaAs tyre-shape quantum ring (TSQR) by using the plane wave basis. The results show that the electron energy levels are sensitively dependent on the TSQR's section thickness d, and insensitively dependent on TSQR's section inner radius R1 and TSQR's inner radius R2. The model and results provide useful information for the design and fabrication of InAs/GaAs TSQRs.

  11. Wait times to rheumatology care for patients with rheumatic diseases: a data linkage study of primary care electronic medical records and administrative data

    PubMed Central

    Widdifield, Jessica; Bernatsky, Sasha; Thorne, J. Carter; Bombardier, Claire; Jaakkimainen, R. Liisa; Wing, Laura; Paterson, J. Michael; Ivers, Noah; Butt, Debra; Lyddiatt, Anne; Hofstetter, Catherine; Ahluwalia, Vandana; Tu, Karen

    2016-01-01

    Background: The Wait Time Alliance recently established wait time benchmarks for rheumatology consultations in Canada. Our aim was to quantify wait times to primary and rheumatology care for patients with rheumatic diseases. Methods: We identified patients from primary care practices in the Electronic Medical Record Administrative data Linked Database who had referrals to Ontario rheumatologists over the period 2000-2013. To assess the full care pathway, we identified dates of symptom onset, presentation in primary care and referral from electronic medical records. Dates of rheumatologist consultations were obtained by linking with physician service claims. We determined the duration of each phase of the care pathway (symptom onset to primary care encounter, primary care encounter to referral, and referral to rheumatologist consultation) and compared them with established benchmarks. Results: Among 2430 referrals from 168 family physicians, 2015 patients (82.9%) were seen by 146 rheumatologists within 1 year of referral. Of the 2430 referrals, 2417 (99.5%) occurred between 2005 and 2013. The main reasons for referral were osteoarthritis (32.4%) and systemic inflammatory rheumatic diseases (30.6%). Wait times varied by diagnosis and geographic region. Overall, the median wait time from referral to rheumatologist consultation was 74 (interquartile range 27-101) days; it was 66 (interquartile range 18-84) days for systemic inflammatory rheumatic diseases. Wait time benchmarks were not achieved, even for the most urgent types of referral. For systemic inflammatory rheumatic diseases, most of the delays occurred before referral. Interpretation: Rheumatology wait times exceeded established benchmarks. Targeted efforts are needed to promote more timely access to both primary and rheumatology care. Routine linkage of electronic medical records with administrative data may help fill important gaps in knowledge about waits to primary and specialty care. PMID:27398365

  12. Administrators: Nursing Home Administrator

    ERIC Educational Resources Information Center

    Kahl, Anne

    1976-01-01

    Responsibilities, skills needed, training needed, earnings, employment outlook, and sources of additional information are outlined for the administrator who holds the top management job in a nursing home. (JT)

  13. CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES: Fifth-Nearest-Neighbor Tight-Binding Description of Electronic Structure of Graphene

    NASA Astrophysics Data System (ADS)

    You, Jing-Han; Ju, Wei-Wei; Li, Er-Qiang; Pu, Tian-Song; Zhao, Yuan-Yuan; Wang, Hui

    2010-06-01

    An analytic expression for π and π* electronic structure of graphene is derived within the tight-binding approximation. Including up to fifth-nearest neighbors, the tight-binding description of electronic dispersion quite accurately reproduces the first-principle calculation result over the entire Brillouin zone. The maximal deviation of the fifth-nearest tight-binding result from the first-principle result is only 6 meV for π band, and 25 meV for π* band. This 25 meV deviation is only one-tenth of the maximal deviation of the third-nearest tight-binding result. It is more important that the fitted parameters exponentially approach to zero as the distance between interacting atoms increases.

  14. M-shell resolved high-resolution X-ray spectroscopic study of transient matter evolution driven by hot electrons in kJ-laser produced plasmas

    NASA Astrophysics Data System (ADS)

    Condamine, F. P.; Šmíd, M.; Renner, O.; Dozières, M.; Thais, F.; Angelo, P.; Rosmej, F. B.

    2017-03-01

    Hot electrons represent a key subject for high intensity laser produced plasmas and atomic physics. Simulations of the radiative properties indicate a high sensitivity to hot electrons, that in turn provides the possibility for their detailed characterization by high-resolution spectroscopic methods. Of particular interest is X-ray spectroscopy due to reduced photo-absorption in dense matter and their efficient generation by hot electrons (inner-shell ionization/excitation). Here, we report on an experimental campaign conducted at the ns, kJ laser facility PALS at Prague in Czech Republic. Thin copper foils have been irradiated with 1ω pulses. Two spherically bent quartz Bragg crystal spectrometers with high spectral (λ/Δλ > 5000) and spatial resolutions (Δx = 30µm) have been set up simultaneously to achieve a high level of confidence for the complex Kα emission group. In particular, this group, which shows a strong overlap between lines, can be resolved in several substructures. Furthermore, an emission on the red wing of the Kα2 transition (λ = 1.5444A) could be identified with Hartree-Fock atomic structure calculations. We discuss possible implications for the analysis of non-equilibrium phenomena and present first simulations.

  15. Light and Electron Microscopic Studies of the Rat Kidney After Administration of Inhibitors of the Citric Acid Cycle In Vivo

    PubMed Central

    McDowell, Elizabeth M.

    1972-01-01

    Light and electron microscopic studies of morphologic changes in the rat proximal convoluted tubule after intraperitoneal injection of sodium fluoroacetate (FAc), 60, 20 and 3.5 mg/kg body weight, have been made. Particular attention was directed toward appreciating different changes in the first (S1) and second (S2) segments of the proximal tubule. The earliest change was loss of mitochondrial granules and pallor of the mitochondrial matrix, not necessarily associated with matrix swelling. Matrix swelling was greatest at 3 hours after 3.5 mg/kg and was reversible. However, the mitochondria retained their elongate shape and cristae persisted. At 48 hours, some mitochondria appeared normal; in others, abnormal matrix densities of unknown nature were present. Mitochondrial changes were similar in S1 and S2 at all times. Enlarged apical vacuoles, most pronounced in S1, occurred in all rats after 20 mg/kg. The change was uncommon after 3.5 mg/kg. The hypothesis proposed is that vacuoles arise during an FAc-induced hyperglycemic phase, when pinocytotic activity is maintained but the normal pathway of glucose catabolism is inhibited. Moderate dilatation of the rough-surfaced endoplasmic reticulum occurred during the first 2-hour period in S1 and S2 tubules after high and low doses, but between 6 and 24 hours, dilatation was extensive in S1 tubules after 3.5 mg/kg. This change was reversible. Two types of abnormal vacuolar bodies, large and small, have been described, and were unique to S1 tubules. Acid phosphatase activity was demonstrated in a proportion of the small ones, indiciating that they were a type of lysosome. The larger ones shared features in common with cytosomes of control cells, but acid phosphatase activity was not demonstrated in them and their origins and functions remain obscure. The biochemical lesions induced by fluoroacetate have been discussed and a tentative interpretation of some of the morphologic changes has ben made. ImagesFig 20Fig 21Fig 1Fig

  16. CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES: Electronic and Magnetic Properties of Double Perovskite Ca2CrSbO6

    NASA Astrophysics Data System (ADS)

    Zhao, Yuan; Ni, Guang-Xin; Liu, Hui-Ping; Yi, Lin

    2010-01-01

    First-principles calculations have been performed for the study of the electronic hand structure and ferromagnetic properties of double perovskite Ca2CrSbO6. The density of states, total energy, spin magnetic moment, and charge density were calculated and analyzed in details. It is found that Ca2CrSbO6 has a stable ferromagnetic ground state and the spin magnetic moment per molecule is about 2.99μB. The chromium contributes the most in the total magnetic moments. The results indicate that Ca2CrSbO6 is half-metallic.

  17. Oral Administration of Electron-Beam Inactivated Rhodococcus equi Failed to Protect Foals against Intrabronchial Infection with Live, Virulent R. equi

    PubMed Central

    Rocha, Joana N.; Cohen, Noah D.; Bordin, Angela I.; Brake, Courtney N.; Giguère, Steeve; Coleman, Michelle C.; Alaniz, Robert C.; Lawhon, Sara D.; Mwangi, Waithaka; Pillai, Suresh D.

    2016-01-01

    There is currently no licensed vaccine that protects foals against Rhodococcus equi–induced pneumonia. Oral administration of live, virulent R. equi to neonatal foals has been demonstrated to protect against subsequent intrabronchial challenge with virulent R. equi. Electron beam (eBeam)-inactivated R. equi are structurally intact and have been demonstrated to be immunogenic when administered orally to neonatal foals. Thus, we investigated whether eBeam inactivated R. equi could protect foals against developing pneumonia after experimental infection with live, virulent R. equi. Foals (n = 8) were vaccinated by gavaging with eBeam-inactivated R. equi at ages 2, 7, and 14 days, or gavaged with equal volume of saline solution (n = 4), and subsequently infected intrabronchially with live, virulent R. equi at age 21 days. The proportion of vaccinated foals that developed pneumonia following challenge was similar among the vaccinated (7/8; 88%) and unvaccinated foals (3/4; 75%). This vaccination regimen did not appear to be strongly immunogenic in foals. Alternative dosing regimens or routes of administration need further investigation and may prove to be immunogenic and protective. PMID:26828865

  18. Oral Administration of Electron-Beam Inactivated Rhodococcus equi Failed to Protect Foals against Intrabronchial Infection with Live, Virulent R. equi.

    PubMed

    Rocha, Joana N; Cohen, Noah D; Bordin, Angela I; Brake, Courtney N; Giguère, Steeve; Coleman, Michelle C; Alaniz, Robert C; Lawhon, Sara D; Mwangi, Waithaka; Pillai, Suresh D

    2016-01-01

    There is currently no licensed vaccine that protects foals against Rhodococcus equi-induced pneumonia. Oral administration of live, virulent R. equi to neonatal foals has been demonstrated to protect against subsequent intrabronchial challenge with virulent R. equi. Electron beam (eBeam)-inactivated R. equi are structurally intact and have been demonstrated to be immunogenic when administered orally to neonatal foals. Thus, we investigated whether eBeam inactivated R. equi could protect foals against developing pneumonia after experimental infection with live, virulent R. equi. Foals (n = 8) were vaccinated by gavaging with eBeam-inactivated R. equi at ages 2, 7, and 14 days, or gavaged with equal volume of saline solution (n = 4), and subsequently infected intrabronchially with live, virulent R. equi at age 21 days. The proportion of vaccinated foals that developed pneumonia following challenge was similar among the vaccinated (7/8; 88%) and unvaccinated foals (3/4; 75%). This vaccination regimen did not appear to be strongly immunogenic in foals. Alternative dosing regimens or routes of administration need further investigation and may prove to be immunogenic and protective.

  19. 13C Nuclear Magnetic Resonance and Electron Paramagnetic Spectroscopic Comparison of Hydrophobic Acid, Transphilic Acid, and Reverse Osmosis May 2012 Isolates of Organic Matter from the Suwannee River

    PubMed Central

    Nwosu, Ugwumsinachi G.; Cook, Robert L.

    2015-01-01

    Abstract Dissolved organic matter (DOM) is found in most natural waters at concentrations low enough to make DOM isolation methodologies critical to full analytical characterization and preservation. During the last few decades, two major protocols have been developed for the extraction of DOM isolates from natural waters. These methods utilize XAD resins and reverse osmosis (RO). In this work, the hydrophobic acid (May 2012 HPOA) and transphilic acid (May 2012 TPIA) isolates from XAD-8 and XAD-4 resins, respectively, were compared with the RO (May 2012 RO) natural organic matter isolate of the Suwannee River water using 13C nuclear magnetic resonance (NMR) and electron paramagnetic resonance (EPR) spectroscopies. 13C NMR analysis showed that the May 2012 RO isolate could be viewed as a hybrid of the more hydrophobic May 2012 HPOA isolate and more hydrophilic May 2012 TPIA isolate. The May 2012 HPOA isolate is shown to be higher in alkyl and aromatic moieties, while the May 2012 TPIA isolate is higher in O-alkyl moieties. EPR analysis revealed that the May 2012 TPIA and, in particular, May 2012 HPOA isolates had higher radical concentrations than the May 2012 RO isolate. It is postulated that some of the radical concentrations came from the use of base during the isolation procedures, especially in the XAD method. PMID:25565761

  20. CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES: Optoelectronic Properties for Armchair-Edge Graphene Nanoribbons

    NASA Astrophysics Data System (ADS)

    Peng, Xin-Xiang; Liao, Wen-Ru; Zhou, Guang-Hui

    2008-09-01

    We study theoretically the electronic and transport property for an armchair-edge graphene nanoribbon (CNR) with 12 and 11 transversal atomic lines, respectively. The GNR is irradiated under an external longitudinal polarized high-frequency electromagnetic field at low temperatures. Within the framework of linear response theory in the perturbative regime, we examine the joint density of states and the real conductance of the system. It is demonstrated that, by numerical examples, some new photon-assisted intersubband transitions over a certain range of Geld frequency exist with different selection rules from those of both zigzag-edge GNR and single-walled carbon nanotube. This opto-electron property dependence of armchair-edge GNR on field frequency may be used to detect the high-frequency electromagnetic irradiation.

  1. CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES: Transport Through a Precessing Spin Coupled to Noncollinearly Polarized Ferromagnetic Leads

    NASA Astrophysics Data System (ADS)

    Wang, Xian-Chao; Xin, Zi-Hua; Feng, Li-Ya

    2010-02-01

    The quantum electronic transport through a precessing magnetic spin coupled to noncollinearly polarized ferromagnetic leads (F-MS-F) has been studied in this paper. The nonequilibrium Green function approach is used to calculate local density of states (LDOS) and current in the presence of external bias. The characters of LDOS and the electronic current are obtained. The tunneling current is investigated for different precessing angle and different configurations of the magnetization of the leads. The investigation reveals that when the precessing angle takes θ < π/2 and negative bias is applied, the resonant tunneling current appears, otherwise, it appears when positive bias is applied. When the leads are totally polarized and the precessing angel takes 0, the tunneling current changes with the configuration of two leads; and it becomes zero when the two leads are antiparallel.

  2. CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES: Synthesis and Multiferroic Properties of BiFeO3 Nanotubes

    NASA Astrophysics Data System (ADS)

    Wang, Jing; Li, Mei-Ya; Liu, Xiao-Lian; Pei, Ling; Liu, Jun; Yu, Ben-Fang; Zhao, Xing-Zhong

    2009-11-01

    Highly ordered BiFeO3(BFO) nanotubes with about 200 nm in diameter and 60 μm in length are fabricated by a sol-gel AAO template method. A perovskite-type structure of BFO is confirmed in the nanotubes by transmission electron microscopy and selected area electron diffraction analysis. The coexistence of ferroelectric and ferromagnetic ordering of these BFO nanotubes at room temperature is demonstrated, giving a remnant polarization of 26μC/cm2, a low coercive electric field of 60 kV/cm, and a magnetization of 0.18 emu/g. In addition, it is found that the leakage behavior of these nanotubes is dominated by the ohmic contact mechanism.

  3. CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES: Spin Polarizations of Electron with Rashba Couplings in T-Shaped Devices: A Finite Element Approach

    NASA Astrophysics Data System (ADS)

    Zhu, Song; Liu, Hui-Ping; Yi, Lin

    2010-09-01

    A generalized finite element formulation is proposed for the study of the spin-dependent ballistic transport of electron through the two-dimensional quantum structures with Rashba spin-orbit interactions (SOI). The transmission coefficient, conductance, the total and local polarization are numerically calculated and discussed as the Rashba coefficient, the geometric sizes, and incident energy are changed in the T-shaped devices. Some interesting features are found in the proper parameter regime. The polarization has an enhancement as the Rashba coefficient becomes stronger. The polarization valley is rigid in the regime of the conductance plateaus since the local interference among the polarized multi-wave modes. The Rashba interactions coupling to geometry in sizes could form the structure-induced Fano-Rashba resonance. In the wider stub, the localized spin lattice of electron could be produced. The conductance plateaus correspond to weak polarizations. Strong polarizations appear when the stub sizes, incident energy, and the Rashba coupling coefficient are matched. The resonances are formed in a wide Fermi energy segment easily.

  4. Amorphization and D/H fractionation of kerogens during experimental electron irradiation: Comparison with chondritic organic matter

    NASA Astrophysics Data System (ADS)

    Le Guillou, Corentin; Remusat, Laurent; Bernard, Sylvain; Brearley, Adrian J.; Leroux, Hugues

    2013-09-01

    Irradiation is common in the interstellar medium and the protosolar nebula. We have investigated the effects of electron irradiation on kerogens of type I and III in a 200 kV transmission electron microscope (TEM), at 293 K and 92 K, using various fluences. Using synchrotron-based scanning transmission X-ray microscopy (STXM) and NanoSIMS, we have demonstrated a progressive amorphization coupled with hydrogen loss and a significant deuterium to hydrogen ratio (D/H) fractionation, with δD increasing by up to 1000‰. Hydrogen loss is non-linearly related to the fluence. Irradiation under cryogenic conditions (92 K) hinders amorphization and D/H elevation. We suggest that these effects are controlled by radiolysis (carbonsbnd hydrogen bonds are broken and hydrogen is lost), coupled with recombination. The amorphization and hydrogen loss are rate-limited by defect diffusion which controls the recombination probability. The D/H increase appears to follow a Rayleigh distillation law with an apparent fractionation factor similar to the equilibrium fractionation factor of the isotopic exchange reaction CH4 + HD ↔ CH3D + H2. This study represents a first step to estimate the kinetics and timescales of D/H fractionation under ionizing radiation. Extrapolatation of this fractionation behavior to natural environments remains difficult at this point because simultaneous irradiation by protons and other cosmic rays at various energies also occurs. However, the present results show that isotopic fractionation by electron irradiation at 200 kV alone might have been kinetically inhibited at the low temperatures of the interstellar medium and the outer region of the protosolar nebula. In addition, we show that STXM or NanoSIMS experiments should not be performed on organic samples that have already been investigated using TEM, even under low flux electron irradiation conditions.

  5. Laser-to-hot-electron conversion limitations in relativistic laser matter interactions due to multi-picosecond dynamics

    DOE PAGES

    Schollmeier, Marius; Sefkow, Adam B.; Geissel, Matthias; ...

    2015-04-20

    High-energy short-pulse lasers are pushing the limits of plasma-based particle acceleration, x-ray generation, and high-harmonic generation by creating strong electromagnetic fields at the laser focus where electrons are being accelerated to relativistic velocities. Understanding the relativistic electron dynamics is key for an accurate interpretation of measurements. We present a unified and self-consistent modeling approach in quantitative agreement with measurements and differing trends across multiple target types acquired from two separate laser systems, which differ only in their nanosecond to picosecond-scale rising edge. Insights from high-fidelity modeling of laser-plasma interaction demonstrate that the ps-scale, orders of magnitude weaker rising edge ofmore » the main pulse measurably alters target evolution and relativistic electron generation compared to idealized pulse shapes. This can lead for instance to the experimentally observed difference between 45 MeV and 75 MeV maximum energy protons for two nominally identical laser shots, due to ps-scale prepulse variations. Our results indicate that the realistic inclusion of temporal laser pulse profiles in modeling efforts is required if predictive capability and extrapolation are sought for future target and laser designs or for other relativistic laser ion acceleration schemes.« less

  6. Laser-to-hot-electron conversion limitations in relativistic laser matter interactions due to multi-picosecond dynamics

    SciTech Connect

    Schollmeier, Marius; Sefkow, Adam B.; Geissel, Matthias; Arefiev, Alexey V.; Flippo, Kirk A.; Gaillard, Sandrine A.; Johnson, Randy P.; Kimmel, Mark W.; Offermann, Dustin T.; Rambo, Patrick K.; Schwarz, Jens; Shimada, Tom

    2015-04-20

    High-energy short-pulse lasers are pushing the limits of plasma-based particle acceleration, x-ray generation, and high-harmonic generation by creating strong electromagnetic fields at the laser focus where electrons are being accelerated to relativistic velocities. Understanding the relativistic electron dynamics is key for an accurate interpretation of measurements. We present a unified and self-consistent modeling approach in quantitative agreement with measurements and differing trends across multiple target types acquired from two separate laser systems, which differ only in their nanosecond to picosecond-scale rising edge. Insights from high-fidelity modeling of laser-plasma interaction demonstrate that the ps-scale, orders of magnitude weaker rising edge of the main pulse measurably alters target evolution and relativistic electron generation compared to idealized pulse shapes. This can lead for instance to the experimentally observed difference between 45 MeV and 75 MeV maximum energy protons for two nominally identical laser shots, due to ps-scale prepulse variations. Our results indicate that the realistic inclusion of temporal laser pulse profiles in modeling efforts is required if predictive capability and extrapolation are sought for future target and laser designs or for other relativistic laser ion acceleration schemes.

  7. In vitro assays in natural products research - a matter of concentration and relevance to in vivo administration using resveratrol, α-mangostin/γ-mangostin and xanthohumol as examples.

    PubMed

    Willson, C M; Grundmann, O

    2017-03-01

    Herbal or botanical dietary supplements are an ever increasingly popular category of products in the United States and around the world. In vitro data can provide meaningful insight into the potential target and mechanism of action for a proposed active compound but may also be misused to promote a supplement to consumers with unverified health claims. In vitro data need to be considered alongside pharmacokinetic and pharmacodynamic data in preclinical animal and clinical human trials. While considerable activity of compounds and extracts in vitro may lead to further testing in vivo, in many instances, concentrations tested in cell lines or isolated targets are not achievable at the target site in vivo. Thus, whether the in vitro data are relevant to humans after oral administration is questionable. This review will discuss this discrepancy using in vitro and in vivo data of resveratrol, xanthones (α-mangostin and γ-mangostin) and xanthohumol.

  8. CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES: First-Principles Calculations of Structures and Electronic Properties of Solid Pentaerythritol under Pressure

    NASA Astrophysics Data System (ADS)

    Lu, Lai-Yu; Wei, Dong-Qing; Chen, Xiang-Rong; Ji, Guang-Fu

    2008-09-01

    Structures and electronic properties of the pentaerythritol (PE) crystal under volume compression up to 0.85V0 are studied by E - V fitting method using density functional theory (DFT). The compression dependences of the cell volumes, lattice constants, and molecular geometries of solid PE are presented and discussed. It is found that the solid PE presents anisotropy along a- and c-axes, and the c axis is the most compressible. Decreasing anisotropy ratio (c/a) with elevating compression suggests an enhancement of the vdW interaction with increasing compression. The C-C and C-H bonds are significantly reduced under compression, which may be related to the sensitivity. The solid PE has indirect band gap (X - G) in the range of the researched compression and the band gap is decreased with compression.

  9. CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES: Electronic Structure and Elastic Properties of Ti3AlC from First-Principles Calculations

    NASA Astrophysics Data System (ADS)

    Du, Yu-Lei

    2009-11-01

    We perform a first-principles study on the electronic structure and elastic properties of Ti3AlC with an antiperovskite structure. The absence of band gap at the Fermi level and the finite value of the density of states at the Fermi energy reveal the metallic behavior of this compound. The elastic constants of Ti3AlC are derived yielding c11 = 356 GPa, c11 = 55 GPa, c44 = 157 GPa. The bulk modulus B, shear modulus G and Young's modulus E are determined to be 156, 151 and 342 GPa, respectively. These properties are compared with those of Ti3AlC2 and Ti2AlC with a layered structure in the Ti-Al-C system and Fe3AlC with the same antiperovskite structure.

  10. CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES: Derivative of Electron Density in Non-Equilibrium Green's Function Technique and Its Application to Boost Performance of Convergence

    NASA Astrophysics Data System (ADS)

    Yuan, Ze; Chen, Zhi-Dong; Zhang, Jin-Yu; He, Yu; Zhang, Ming; Yu, Zhi-Ping

    2009-11-01

    The non-equilibrium Green's function (NEGF) technique provides a solid foundation for the development of quantum mechanical simulators. However, the convergence is always of great concern. We present a general analytical formalism to acquire the accurate derivative of electron density with respect to electrical potential in the framework of NEGF. This formalism not only provides physical insight on non-local quantum phenomena in device simulation, but also can be used to set up a new scheme in solving the Poisson equation to boost the performance of convergence when the NEGF and Poisson equations are solved self-consistently. This method is illustrated by a simple one-dimensional example of an N++ N+ N++ resistor. The total simulation time and iteration number are largely reduced.

  11. CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES: Infrared studies of oxygen-related complexes in electron-irradiated Cz-Si

    NASA Astrophysics Data System (ADS)

    Chen, Gui-Feng; Yan, Wen-Bo; Chen, Hong-Jian; Cui, Hui-Ying; Li, Yang-Xian

    2009-07-01

    This paper investigates the infrared absorption spectra of oxygen-related complexes in silicon crystals irradiated with electron (1.5 MeV) at 360 K. Two groups of samples with low [Oi] = 6.9 × 1017 cm-3 and high [Oi] = 1.06 × 1018 cm-3 were used. We found that the concentration of the VO pairs have different behaviour to the annealing temperature in different concentration of oxygen specimen, it is hardly changed in the higher concentration of oxygen specimen. It was also found that the concentration of VO2 in lower concentration of oxygen specimen gets to maximum at 450 °C and then dissapears at 500 °C, accompanied with the appearing of VO3. For both kinds of specimens, the concentration of VO3 reachs to maximum at 550 °C and does not disappear completely at 600 °C.

  12. CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES: Linear and Nonlinear Optical Properties in Spherical Quantum Dots

    NASA Astrophysics Data System (ADS)

    Yakar, Yusuf; Çakir, Bekir; Özmen, Ayhan

    2010-06-01

    We calculate the energy eigenvalues and the sate functions of one-electron Quantum Dot (QD) by using a combination of Quantum Genetic Algorithm (QGA) and Hartree-Fock-Roothaan (HFR) method. The linear and the third-order nonlinear optical absorption coefficients for the 1s-1p, 1p-1d, and 1d-1f transitions are examined as a function of the incident photon energy for three different values of the stoichiometric ratio. The results show that the stoichiometric ratio, impurity, relaxation time, and dot size have great influence on the optical absorption coefficients of QDs.

  13. CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES: Kondo effect in a deformed molecule coupled asymmetrically to ferromagnetic electrodes

    NASA Astrophysics Data System (ADS)

    Wang, Rui-Qiang; Jiang, Kai-Ming

    2009-12-01

    The nonequilibrium Kondo effect is studied in a molecule quantum dot coupled asymmetrically to two ferromagnetic electrodes by employing the nonequilibrium Green function technique. The current-induced deformation of the molecule is taken into account, modeled as interactions with a phonon system, and phonon-assisted Kondo satellites arise on both sides of the usual main Kondo peak. In the antiparallel electrode configuration, the Kondo satellites can be split only for the asymmetric dot-lead couplings, distinguished from the parallel configuration where splitting also exists, even though it is for symmetric case. We also analyze how to compensate the splitting and restore the suppressed zero-bias Kondo resonance. It is shown that one can change the TMR ratio significantly from a negative dip to a positive peak only by slightly modulating a local external magnetic field, whose value is greatly dependent on the electron-phonon coupling strength.

  14. CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Magnetic Manipulation of Massless Dirac Fermions in Graphene Quantum Dot

    NASA Astrophysics Data System (ADS)

    Lin, Xin; Pan, Hui; Xu, Huai-Zhe

    2010-12-01

    We have theoretically analyzed the quasibound states in a graphene quantum dot (GQD) with a magnetic flux Φ in the centre. It is shown that the two-fold time reversal degeneracy is broken and the quasibound states of GQD with positive/negative angular momentum shifted upwards / downwards with increasing the magnetic flux. The variation of the quasibound energy depends linearly on the magnetic flux, which is quite different from the parabolic relationship for Schrödinger electrons. The GQD's quasibound states spectrum shows an obvious Aharonov—Bohm (AB) oscillations with the magnetic flux. It is also shown that the quasibound state with energy equal to the barrier height becomes a bound state completely confined in GQD.

  15. CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES: Effects of Grain Boundary Barrier in ZnO/Si Heterostructure

    NASA Astrophysics Data System (ADS)

    Liu, Bing-Ce; Liu, Ci-Hui; Fu, Zhu-Xi; Yi, Bo

    2009-11-01

    The influence of ZnO microstructure on electrical barriers is investigated using capacitance-voltage (C - V), current-voltage (I - V) and deep level transient spectroscopy (DLTS) measurements. A deep level center located at Ec - 0.24 eV obtained by DLTS in the ZnO films is an intrinsic defect related to Zni. The surface states in the ZnO grains that have acceptor behavior of capturing electrons from Zni defects result in the formation of grain barriers. In addition, we find that the current transport is dominated by grain barriers after annealing at 600° C at O2 ambient. With the increment of the annealing temperature, the current transport mechanism of ZnO/Si heterostructure is mainly dominated by thermo-emission.

  16. IVA: Improving Vocational Administration.

    ERIC Educational Resources Information Center

    EPD Consortium D, Richardson, TX.

    These six instructional units are intended to provide instructors of vocational education administration with a systematic package of materials for their programs of preservice and/or inservice instruction and to provide materials which could be reproduced for learner use. These units cover the following subject matter: (1) federal legislation…

  17. 7 CFR 550.33 - Administrative supervision.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ... OF AGRICULTURE GENERAL ADMINISTRATIVE POLICY FOR NON-ASSISTANCE COOPERATIVE AGREEMENTS Management of... in matters related to cooperator employer/employee relations such as personnel, performance and...

  18. 7 CFR 550.33 - Administrative supervision.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ... OF AGRICULTURE GENERAL ADMINISTRATIVE POLICY FOR NON-ASSISTANCE COOPERATIVE AGREEMENTS Management of... in matters related to cooperator employer/employee relations such as personnel, performance and...

  19. CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES: Controllable Spin Polarization of Charge Current by Rashba Spin Orbital Coupling

    NASA Astrophysics Data System (ADS)

    Cui, Juan; Yang, Yong-Hong; Wang, Jun

    2009-11-01

    We report a theoretic study on modulating the spin polarization of charge current in a mesoscopic four-terminal device of cross structure by using the inverse spin hall effect. The scattering region of device is a two-dimensional electron gas (2DEG) with Rashba spin orbital interaction (RSOI), one of lead is ferromagnetic metal and other three leads are spin-degenerate normal metals. By using Landauer-Büttiker formalism, we found that when a longitudinal charge current flows through 2DEG scattering region from FM lead by external bias, the transverse current can be either a pure spin current or full-polarized charge current due to the combined effect of spin hall effect and its inverse process, and the polarization of this transverse current can be easily controlled by several device parameters such as the Fermi energy, ferromagnetic magnetization, and the RSOI constant. Our method may pave a new way to control the spin polarization of a charge current.

  20. Light-matter interactions in semiconductor nanowires: Light-effect transistor and light-induced changes in electron-phonon coupling and electrical characteristics

    NASA Astrophysics Data System (ADS)

    Marmon, Jason Kendrick

    This dissertation explores three related embodiments of light-matter interactions at the micro- and nano-scales, and is focused towards tangible device applications. The first topic provides a fundamentally different transistor or electronic switch mechanism, which is termed a light-effect transistor (LET). The LET, unlike exotic techniques, provides a practical and viable approach using existing fabrication processes. Electronic devices at the nanoscale operate within the ballistic regime, where the dominate source of energy loss comes from impurity scattering. As a LET does not require extrinsic doping, it circumvents this issue. Electron-phonon coupling, however, is the second largest source, and it is a pertinent and important parameter affecting electronic conductivity and energy efficiency, such as in LETs. The third topic is laser writing, or the use of a laser to perform post-growth modifications, to achieve specific optical and electrical characteristics. A LET offers electronic-optical hybridization at the component level, which can continue Moore's law to the quantum region without requiring a FET's fabrication complexity, e.g., physical gate and doping, by employing optical gating and photoconductivity. Multiple independent gates are therefore readily utilized to achieve unique functionalities without increasing chip space. LET device characteristics and novel digital and analog applications, such as optical logic gates and optical amplification, are explored. Prototype cadmium selenide (CdSe) nanowire-based LETs show output and transfer characteristics resembling advanced FETs, e.g., on/off ratios up to 1.0x10 6 with a source-drain voltage of 1.43 V, gate-power of 260 nW, and a subthreshold swing of 0.3 nW/decade (excluding losses). The LET platform offers new electronic-optical integration strategies and high speed and low energy electronic and optical computing approaches. Electron-phonon coupling is typically studied as an intrinsic property, which

  1. Implementing Health in All Policies - Time and Ideas Matter Too! Comment on "Understanding the Role of Public Administration in Implementing Action on the Social Determinants of Health and Health Inequities".

    PubMed

    Clavier, Carole

    2016-06-20

    Carey and Friel suggest that we turn to knowledge developed in the field of public administration, especially new public governance, to better understand the process of implementing health in all policies (HiAP). In this commentary, I claim that theories from the policy studies bring a broader view of the policy process, complementary to that of new public governance. Drawing on the policy studies, I argue that time and ideas matter to HiAP implementation, alongside with interests and institutions. Implementing HiAP is a complex process considering that it requires the involvement and coordination of several policy sectors, each with their own interests, institutions and ideas about the policy. Understanding who are the actors involved from the various policy sectors concerned, what context they evolve in, but also how they own and frame the policy problem (ideas), and how this has changed over time, is crucial for those involved in HiAP implementation so that they can relate to and work together with actors from other policy sectors.

  2. When matter matters

    SciTech Connect

    Easson, Damien A.; Sawicki, Ignacy; Vikman, Alexander E-mail: ignacy.sawicki@uni-heidelberg.de

    2013-07-01

    We study a recently proposed scenario for the early universe:Subluminal Galilean Genesis. We prove that without any other matter present in the spatially flat Friedmann universe, the perturbations of the Galileon scalar field propagate with a speed at most equal to the speed of light. This proof applies to all cosmological solutions — to the whole phase space. However, in a more realistic situation, when one includes any matter which is not directly coupled to the Galileon, there always exists a region of phase space where these perturbations propagate superluminally, indeed with arbitrarily high speed. We illustrate our analytic proof with numerical computations. We discuss the implications of this result for the possible UV completion of the model.

  3. Development management for nursing administration.

    PubMed

    Heyden, R; Luyas, G; Henry, B

    1990-04-01

    What are the needs of a nurse administrator in a developing country? For that matter, what are the requirements for a nurse administrator in areas of lesser developed delivery in this country (e.g., care of the homeless, care of indigent populations)? Heyden, Luyas, and Henry look at the educational needs of these nurse managers and compare the needs to the typical education received in nursing administration programs.

  4. Sub-nanometer-scale measurements of the interaction of ultrafast soft x-ray free-electron-laser pulses with matter

    SciTech Connect

    Hau-Riege, S; Chapman, H; Krzywinski, J; Sobierajski, R; London, R; Bionta, R; Bergh, M; Caleman, C; Nietubyc, R; Juha, L; Kuba, J; Bajt, S; Spiller, E; Baker, S; Kjornrattanawanich, B; Gullikson, E; Tschentscher, T; Plonjes, E; Toleikis, S

    2006-08-02

    Femtosecond pulses from soft-x-ray free-electron lasers (FELs) [1] are ideal for directly probing matter at atomic length scales and timescales of atomic motion. An important component of understanding ultrafast phenomena of light-matter interactions is concerned with the onset of atomic motion which is impeded by the atoms inertia. This delay of structural changes will enable atomic-resolution flash-imaging [2-3] to be performed at upcoming x-ray FELs [4-5] with pulses intense enough to record the x-ray scattering from single molecules [6]. We explored this ultrafast high-intensity regime with the FLASH soft-x-ray FEL [7-8] by measuring the reflectance of nanostructured multilayer mirrors using pulses with fluences far in excess of the mirrors damage threshold. Even though the nanostructures were ultimately completely destroyed, we found that they maintained their integrity and reflectance characteristics during the 25-fs-long pulse, with no evidence for any structural changes during that time over lengths greater than 3 {angstrom}. In the recently built FLASH FEL [7], x-rays are produced from short electron pulses oscillating in a periodic magnet array, called an undulator, by the principle of self-amplification of spontaneous emission [9-10]. The laser quality of the x-ray pulses can be quantified by the peak spectral brilliance of the source, which is 10{sup 28} photons/(s mm2 mrad2 0.1% bandwidth) [8]; this is up to seven orders of magnitude higher than modern third-generation synchrotron sources. For our studies, the machine operated with pulses of 25 fs duration at a wavelength of 32.5 nm and energies up to 21 {micro}J. We focused these pulses to 3 x 10{sup 14} W/cm{sup 2} onto our nanostructured samples, resulting in an the unprecedented heating rate of 5 x 10{sup 18} K/s, while probing the irradiated structures at the nanometer length scale. The x-ray reflectivity of periodic nanometer-scale multilayers [11] is very sensitive to changes in the atomic

  5. Galactic Dark Matter

    NASA Astrophysics Data System (ADS)

    Burch, Benjamin P.

    The precise phase-space distribution and properties of Galactic dark matter necessary for its direct and indirect detection are currently unknown. Since the distributions of normal and dark matter in the Milky Way are coupled to each other as they both move in the same gravitational potential, constraints on the distribution and properties of dark matter can be derived by studying the distribution of visible matter in the Galaxy and making some general assumptions regarding the phase-space distribution of the dark matter. In this study, the visible components of the Galaxy have been comprehensively reviewed to create an axisymmetric model of the Galaxy that is consistent with the available observations, and the dark matter phase-space distribution is assumed to follow a lowered-isothermal form. Poisson's equations are then solved self-consistently to construct models of the spatial and velocity distribution of Galactic dark matter. The total gravitational potential from normal and dark matter are calculated and compared to the current observations of the rotation curve and to the radial velocity distributions of blue horizontal-branch and blue straggler stars. It is found that this analysis allows for a wide range of parameters for the dark matter. The implications for direct and indirect detection of dark matter are discussed in detail. In the appendices, two additional projects are presented. In Appendix A, the recent observations of the positron fraction and the total electron spectrum in cosmic rays are addressed by considering a nested leaky-box model for the propagation of cosmic rays in the Galaxy. This is found to obviate the need for exotic processes such as the annihilation or decay of dark matter to explain the recent observations. In Appendix B, we discuss a novel dark matter detector involving triggered cavitation in acoustic fields. The theory behind the detector is presented in detail, and we discuss the work than has been done to create a prototype

  6. Elastically Decoupling Dark Matter.

    PubMed

    Kuflik, Eric; Perelstein, Maxim; Lorier, Nicolas Rey-Le; Tsai, Yu-Dai

    2016-06-03

    We present a novel dark matter candidate, an elastically decoupling relic, which is a cold thermal relic whose present abundance is determined by the cross section of its elastic scattering on standard model particles. The dark matter candidate is predicted to have a mass ranging from a few to a few hundred MeV, and an elastic scattering cross section with electrons, photons and/or neutrinos in the 10^{-3}-1  fb range.

  7. Administrative Synergy

    ERIC Educational Resources Information Center

    Hewitt, Kimberly Kappler; Weckstein, Daniel K.

    2012-01-01

    One of the biggest obstacles to overcome in creating and sustaining an administrative professional learning community (PLC) is time. Administrators are constantly deluged by the tyranny of the urgent. It is a Herculean task to carve out time for PLCs, but it is imperative to do so. In this article, the authors describe how an administrative PLC…

  8. 7 CFR 633.3 - Administration.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ... 7 Agriculture 6 2011-01-01 2011-01-01 false Administration. 633.3 Section 633.3 Agriculture... AGRICULTURE LONG TERM CONTRACTING WATER BANK PROGRAM § 633.3 Administration. (a) The regulations in this part... administration and related policy matters. No determination by the State Technical Committee shall compel...

  9. 7 CFR 633.3 - Administration.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... 7 Agriculture 6 2010-01-01 2010-01-01 false Administration. 633.3 Section 633.3 Agriculture... AGRICULTURE LONG TERM CONTRACTING WATER BANK PROGRAM § 633.3 Administration. (a) The regulations in this part... administration and related policy matters. No determination by the State Technical Committee shall compel...

  10. Superconducting Detectors for Superlight Dark Matter.

    PubMed

    Hochberg, Yonit; Zhao, Yue; Zurek, Kathryn M

    2016-01-08

    We propose and study a new class of superconducting detectors that are sensitive to O(meV) electron recoils from dark matter-electron scattering. Such devices could detect dark matter as light as the warm dark-matter limit, m(X)≳1  keV. We compute the rate of dark-matter scattering off of free electrons in a (superconducting) metal, including the relevant Pauli blocking factors. We demonstrate that classes of dark matter consistent with terrestrial and cosmological or astrophysical constraints could be detected by such detectors with a moderate size exposure.

  11. Administrative Ecology

    ERIC Educational Resources Information Center

    McGarity, Augustus C., III; Maulding, Wanda

    2007-01-01

    This article discusses how all four facets of administrative ecology help dispel the claims about the "impossibility" of the superintendency. These are personal ecology, professional ecology, organizational ecology, and community ecology. Using today's superintendency as an administrative platform, current literature describes a preponderance of…

  12. Administrative simplification: adoption of operating rules for health care electronic funds transfers (EFT) and remittance advice transactions. Interim final rule with comment period.

    PubMed

    2012-08-10

    This interim final rule with comment period implements parts of section 1104 of the Affordable Care Act which requires the adoption of operating rules for the health care electronic funds transfers (EFT) and remittance advice transaction.

  13. CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES: Nonlocal Andreev reflection and spin current in a three-terminal Aharonov-Bohm interferometer

    NASA Astrophysics Data System (ADS)

    Peng, Ju; Yu, Hua-Ling; Wang, Zhi-Guo

    2009-12-01

    This paper theoretically reports the nonlocal Andreev reflection and spin current in a normal metal-ferromagnetic metal-superconducting Aharonov-Bohm interferometer. It is found that the electronic current and spin current are sensitive to systematic parameters, such as the gate voltage of quantum dots and the external magnetic flux. The electronic current in the normal metal lead results from two competing processes: quasiparticle transmission and nonlocal Andreev reflection. The appearance of zero spin-up electronic current (or spin-down electronic current) signals the existence of nonlocal Andreev reflection, and the presence of zero electronic current results in the appearance of pure spin current.

  14. Dark Matters

    ScienceCinema

    Joseph Silk

    2016-07-12

    One of the greatest mysteries in the cosmos is that it is mostly dark.  Astronomers and particle physicists today are seeking to unravel the nature of this mysterious, but pervasive dark matter which has profoundly influenced the formation of structure in the universe.  I will describe the complex interplay between galaxy formation and dark matter detectability and review recent attempts to measure particle dark matter by direct and indirect means.

  15. Dark Matter

    SciTech Connect

    Bashir, A.; Cotti, U.; De Leon, C. L.; Raya, A; Villasenor, L.

    2008-07-02

    One of the biggest scientific mysteries of our time resides in the identification of the particles that constitute a large fraction of the mass of our Universe, generically known as dark matter. We review the observations and the experimental data that imply the existence of dark matter. We briefly discuss the properties of the two best dark-matter candidate particles and the experimental techniques presently used to try to discover them. Finally, we mention a proposed project that has recently emerged within the Mexican community to look for dark matter.

  16. Direct Student Loans: Additional Steps Would Increase Borrowers' Awareness of Electronic Debiting and Reduce Federal Administrative Costs. Report to the Honorable James M. Jeffords, U.S. Senate.

    ERIC Educational Resources Information Center

    Ashby, Cornelia M.

    In November 1999, the U.S. Department of Education began offering a 0.25% interest rate reduction to borrowers under the Direct Loan program who agree to have their monthly loan payments automatically withdrawn from a bank account through its electronic debit account (EDA) program. The Department of Education submitted a justification to the…

  17. Parent Perceptions of the Efficacy of Electronic School-Home Communication Methods Used by the Faculty and Administration of a Rural High School in Southern Georgia

    ERIC Educational Resources Information Center

    Parker, Arlie, III; Sparkman, Dana

    2008-01-01

    The purpose of this study was to determine parent perceptions of the efficacy of the use of three forms of electronic school-home communication used by faculty and staff in a rural high school in southern Georgia--e-mail, PowerSchool, and School Messenger. An anonymous survey instrument containing Likert scale questions, yes/no questions, and…

  18. Literacy Matters.

    ERIC Educational Resources Information Center

    Macedo, Donaldo

    2003-01-01

    Suggests that in an era of excessive high-stakes testing and a blind embrace of "technicism," literacy not only matters, but may represent one of the last hopes to "salvage our already feeble democracy." Concludes that literacy matters if, and only if, it is viewed as a democratic right and as a human right. (SG)

  19. Electron and ion dynamics study of iron in warm dense matter regime by time-resolved XAS measurements and from first-principles

    NASA Astrophysics Data System (ADS)

    Ogitsu, T.; Fernandez-Paãella, A.; Correa, A.; Engelhorn, K.; Barbrel, B.; Prendergast, D. G.; Pemmaraju, D.; Beckwith, M.; Kraus, D.; Hamel, S.; Cho, B. I.; Jin, L.; Wong, J.; Heinman, P.; Collins, G. W.; Falcone, R.; Ping, Y.

    2016-10-01

    We present a study of the electron-phonon coupling of warm dense iron upon femtosecond laser excitation by time-resolved x-ray absorption near edge spectroscopy (XANES). The dynamics of iron in electron-ion non-equilibrium conditions was studied using ab-initio density-functional-theory (DFT) simulations combined with the Two Temperature Model (TTM) where spatial inhomogeneity of electron (and ion) temperature(s) due to short ballistic electron transport length in iron was explicitly taken into consideration. Detailed comparison between our simulation results and experiments indicates that the ion temperature dependence on specific heat and on electron-phonon coupling also plays a relevant role in modeling the relaxation dynamics of electrons and ions. These results are the first experimental evidence of the suppression of the electron-phonon coupling factor of a transition metal at electron temperatures ranging 5000- 10000 K. This work was performed under DOE contract DE-AC52-07NA27344 with support from OFES Early Career program and LLNL LDRD program.

  20. INTERACTION OF LASER RADIATION WITH MATTER: Absorption of a femtosecond laser pulse by metals and the possibility of determining effective electron—electron collision frequencies

    NASA Astrophysics Data System (ADS)

    Isakov, Vladimir A.; Kanavin, Andrey P.; Uryupin, Sergey A.

    2006-10-01

    A method is proposed for describing absorption of an electron-heating femtosecond laser pulse that interacts with a metal under conditions of high-frequency skin effect. It is shown that the effective frequencies of electron—electron collisions accompanied by umklapp processes can be determined by measuring the absorption or reflection coefficients of a femtosecond pulse.

  1. Language Matters

    ERIC Educational Resources Information Center

    Silverberg, Ruth P.; Kottkamp, Robert B.

    2006-01-01

    In 1993, a Special Interest Group, "Teaching in Educational Administration" (TEA/SIG), was born at the annual meeting of the American Educational Research Association as a result of work of the Division A (Administration) Task Force on Teaching and Learning in Educational Administration and the particular efforts of Jane Lindle and Paul Bredeson.…

  2. 77 FR 69768 - General Services Administration Acquisition Regulation (GSAR); Rewrite of Part 504...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-11-21

    ...); Rewrite of Part 504, Administrative Matters; Correction AGENCY: Office of Acquisition Policy, General... Administrative Matters. The final rule contained a typographical error which needs to be corrected. DATES... amendment: PART 504--ADMINISTRATIVE MATTERS 0 1. The authority citation for 48 CFR part 504 continues...

  3. Large Extra Dimension and Dark Matter Detection

    NASA Astrophysics Data System (ADS)

    Qin, Bo; Starkman, Glenn D.; Silk, Joseph

    2008-01-01

    If our space has the large extra dimensions as proposed by Arkani-Hamed, Dimopoulos and Dvali (ADD), then gravity would start to deviate from Newtonian gravity and be greatly enhanced in sub-millimeter scales. Here we show that in the ADD scenario, gravity could play an important role (compared to the weak interaction) in the interactions between dark matter particles and the electron. We find that for typical WIMP dark matter, such dark matter-electron ``gravitational'' scattering cross section may be much larger than the dark matter-nucleon cross section constrained by current dark matter experiments.

  4. Engineering Administration.

    ERIC Educational Resources Information Center

    Naval Personnel Program Support Activity, Washington, DC.

    This book is intended to acquaint naval engineering officers with their duties in the engineering department. Standard shipboard organizations are analyzed in connection with personnel assignments, division operations, and watch systems. Detailed descriptions are included for the administration of directives, ship's bills, damage control, training…

  5. Administrative IT

    ERIC Educational Resources Information Center

    Grayson, Katherine, Ed.

    2006-01-01

    When it comes to Administrative IT solutions and processes, best practices range across the spectrum. Enterprise resource planning (ERP), student information systems (SIS), and tech support are prominent and continuing areas of focus. But widespread change can also be accomplished via the implementation of campuswide document imaging and sharing,…

  6. International Conference on Harmonisation; Electronic Transmission of Postmarket Individual Case Safety Reports for Drugs and Biologics, Excluding Vaccines; Availability of Food and Drug Administration Regional Implementation Specifications for ICH E2B(R3) Reporting to the Food and Drug Administration Adverse Event Reporting System. Notice of Availability.

    PubMed

    2016-06-23

    The Food and Drug Administration (FDA) is announcing the availability of its FDA Adverse Event Reporting System (FAERS) Regional Implementation Specifications for the International Conference on Harmonisation (ICH) E2B(R3) Specification. FDA is making this technical specifications document available to assist interested parties in electronically submitting individual case safety reports (ICSRs) (and ICSR attachments) to the Center for Drug Evaluation and Research (CDER) and the Center for Biologics Evaluation and Research (CBER). This document, entitled "FDA Regional Implementation Specifications for ICH E2B(R3) Implementation: Postmarket Submission of Individual Case Safety Reports (ICSRs) for Drugs and Biologics, Excluding Vaccines" supplements the "E2B(R3) Electronic Transmission of Individual Case Safety Reports (ICSRs) Implementation Guide--Data Elements and Message Specification" final guidance for industry and describes FDA's technical approach for receiving ICSRs, for incorporating regionally controlled terminology, and for adding region-specific data elements when reporting to FAERS.

  7. CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES: Operation Mechanism of Double-Walled Carbon Nanotubes Transistors Investigated By ab initio Calculations

    NASA Astrophysics Data System (ADS)

    Lan, Hai-Ping; Zhang, Shuang

    2009-11-01

    Recently, a new switching characteristic of double-walled carbon nanotubes (DWNTs) transistors is found in during experiments. We carry out a series of ab intio calculations on DWNTs' electronic properities, together with verification on the electronic response under the electric field. Our results reveal that the peculiar energy states relation in DWNTs and related contact modes should account for the distinct switching behavior of DWNT transistors. We believe these results have important implications in the fabrication and understanding of electronic devices with DWNTs.

  8. Degranulation, density, and distribution of mast cells in the rat thalamus: a light and electron microscopic study in basal conditions and after intracerebroventricular administration of nerve growth factor.

    PubMed

    Florenzano, F; Bentivoglio, M

    2000-09-04

    In the adult rat brain mast cells reside selectively in the thalamus. We investigated thalamic mast cells stained by acidic toluidine blue or pinacyanol, and with histamine immunocytochemistry, focusing on their state of activity revealed by degranulation. Mast cells exhibited perivascular prevalence and high quantitative variability, between cases and in different sections, with no asymmetry or topographical selectivity in thalamic nuclei. Pinacyanol, alone or with erythrosine, stained mast cells with higher sensitivity than toluidine blue. However, toluidine blue was highly predictive of pinacyanol staining and provided the best resolution of mast cell cytoplasmic features. Histamine immunocytochemistry labeled 61% of pinacyanol-stained mast cells. Intensely toluidine blue-stained granulated cells, as well as cells exhibiting different degrees of degranulation that paralleled lighter staining, were observed. The response of thalamic mast cells to intracerebroventricular administration of nerve growth factor (NGF) and control cytochrome-c injections was evaluated after 2, 24, and 72 hours. No obvious changes in mast cell number or distribution were found after treatment, but massive degranulation was frequently observed after NGF administration. Significant decrease of staining intensity of mast cells, supporting enhanced degranulation, was documented in NGF-treated animals by quantitative image analysis. Ultrastructural features of mast cell degranulation, with granule coalescence and matrix dissolution, were detected in untreated and NGF-treated cases. The findings point out that mast cells are active in the thalamus in basal conditions and that NGF has the potential to elicit long-lasting degranulation of thalamic mast cells in vivo, exerting a direct effect and/or priming these cells to react to endogenous stimuli.

  9. Quark matter droplets in neutron stars

    NASA Technical Reports Server (NTRS)

    Heiselberg, H.; Pethick, C. J.; Staubo, E. F.

    1993-01-01

    We show that, for physically reasonable bulk and surface properties, the lowest energy state of dense matter consists of quark matter coexisting with nuclear matter in the presence of an essentially uniform background of electrons. We estimate the size and nature of spatial structure in this phase, and show that at the lowest densities the quark matter forms droplets embedded in nuclear matter, whereas at higher densities it can exhibit a variety of different topologies. A finite fraction of the interior of neutron stars could consist of matter in this new phase, which would provide new mechanisms for glitches and cooling.

  10. INTERACTION OF LASER RADIATION WITH MATTER. LASER PLASMA: Laser acceleration of electrons in vacuum up to energies of ~ 109 eV

    NASA Astrophysics Data System (ADS)

    Bahari, A.; Taranukhin, Vladimir D.

    2004-02-01

    A new mechanism of laser acceleration of charged particles is investigated in detail. Upon irradiation by tightly focused high-intensity ultrashort laser pulses, the acceleration of electrons travelling along the laser beam axis is determined by the longitudinal ponderomotive force and the longitudinal component of the electric field of the laser wave. It is found that the action of the longitudinal field on an electron may be unidirectional during many optical cycles, i.e., the phase slip effect is overcome. Lasers with currently highest possible parameters are shown to enable electron acceleration up to energies ɛ ~ 1 GeV, which is comparable to the energies attainable on `large' accelerators of the SLAC type (ɛ ~ 30 — 50 GeV). Unlike the schemes considered in the literature, the acceleration in this case is insensitive to the initial field phase (the effect of electron bunching is absent), it is possible to accelerate slow (nonrelativistic) electrons, and the problem of accelerated electron extraction from the field does not exist.

  11. CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Klein Paradox and Disorder-Induced Delocalization of Dirac Quasiparticles in One-Dimensional Systems

    NASA Astrophysics Data System (ADS)

    Yuan, Jian-Hui; Cheng, Ze; Yin, Miao; Zeng, Qi-Jun; Zhang, Jun-Pei

    2010-12-01

    Dirac particle penetration is studied theoretically with Dirac equation in one-dimensional systems. We investigate a one-dimensional system with N barriers where both barrier height and well width are constants randomly distributed in certain range. The one-parameter scaling theory for nonrelativistic particles is still valid for massive Dirac particles. In the same disorder sample, we find that the localization length of relativistic particles is always larger than that of nonrelativistic particles and the transmission coefficient related to incident particle in both cases fits the form T ~ exp(- αL). More interesting, massless relativistic particles are entirely delocalized no matter how big the energy of incident particles is.

  12. 28 CFR 12.2 - Administration of act.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... 28 Judicial Administration 1 2013-07-01 2013-07-01 false Administration of act. 12.2 Section 12.2 Judicial Administration DEPARTMENT OF JUSTICE REGISTRATION OF CERTAIN PERSONS HAVING KNOWLEDGE OF FOREIGN ESPIONAGE, COUNTERESPIONAGE, OR SABOTAGE MATTERS UNDER THE ACT OF AUGUST 1, 1956 § 12.2 Administration...

  13. 28 CFR 12.2 - Administration of act.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... 28 Judicial Administration 1 2014-07-01 2014-07-01 false Administration of act. 12.2 Section 12.2 Judicial Administration DEPARTMENT OF JUSTICE REGISTRATION OF CERTAIN PERSONS HAVING KNOWLEDGE OF FOREIGN ESPIONAGE, COUNTERESPIONAGE, OR SABOTAGE MATTERS UNDER THE ACT OF AUGUST 1, 1956 § 12.2 Administration...

  14. 28 CFR 12.2 - Administration of act.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... 28 Judicial Administration 1 2012-07-01 2012-07-01 false Administration of act. 12.2 Section 12.2 Judicial Administration DEPARTMENT OF JUSTICE REGISTRATION OF CERTAIN PERSONS HAVING KNOWLEDGE OF FOREIGN ESPIONAGE, COUNTERESPIONAGE, OR SABOTAGE MATTERS UNDER THE ACT OF AUGUST 1, 1956 § 12.2 Administration...

  15. 28 CFR 12.2 - Administration of act.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... 28 Judicial Administration 1 2011-07-01 2011-07-01 false Administration of act. 12.2 Section 12.2 Judicial Administration DEPARTMENT OF JUSTICE REGISTRATION OF CERTAIN PERSONS HAVING KNOWLEDGE OF FOREIGN ESPIONAGE, COUNTERESPIONAGE, OR SABOTAGE MATTERS UNDER THE ACT OF AUGUST 1, 1956 § 12.2 Administration...

  16. 28 CFR 12.2 - Administration of act.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 28 Judicial Administration 1 2010-07-01 2010-07-01 false Administration of act. 12.2 Section 12.2 Judicial Administration DEPARTMENT OF JUSTICE REGISTRATION OF CERTAIN PERSONS HAVING KNOWLEDGE OF FOREIGN ESPIONAGE, COUNTERESPIONAGE, OR SABOTAGE MATTERS UNDER THE ACT OF AUGUST 1, 1956 § 12.2 Administration...

  17. 47 CFR 54.702 - Administrator's functions and responsibilities.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... administrative matters relating to the universal service support mechanisms. (e) The Administrator shall maintain books of account separate from those of the National Exchange Carrier Association, of which the Administrator is an independent subsidiary. The Administrator's books of account shall be maintained...

  18. 7 CFR 550.33 - Administrative supervision.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... OF AGRICULTURE GENERAL ADMINISTRATIVE POLICY FOR NON-ASSISTANCE COOPERATIVE AGREEMENTS Management of Agreements Program Management § 550.33 Administrative supervision. REE employees are prohibited from engaging in matters related to cooperator employer/employee relations such as personnel, performance and...

  19. CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES: Grain Size Effect on Electrical Conductivity and Giant Magnetoresistance of Bulk Magnetic Polycrystals

    NASA Astrophysics Data System (ADS)

    Luo, Wei; Zhu, Lin-Li; Zheng, Xiao-Jing

    2009-11-01

    By solving the Boltzmann transport equation and considering the spin-dependent grain boundary scattering, the distribution of electrons in grains and the electrical transport properties in the applied magnetic field are studied. With regard to the dominant influence of grain boundary scattering which is taken as a boundary condition for the electrical transport, the grain size-dependent electrical conductivity is investigated. In addition, the reorientation of the relative magnetization between grains brings the change of the electron spin when the magnetonanocrystalline material is subjected to the magnetic field, resulting in the remarkable giant magnetoresistance effect.

  20. A Rigorous Curriculum Really Matters

    ERIC Educational Resources Information Center

    Cook, Erika

    2013-01-01

    As every good secondary administrator knows, rigorous curricula matter. Challenging curricula is the factor in lifting each student to reach their potential: "the academic intensity of the student's high school curriculum still counts more than anything else...in providing momentum toward completing a bachelor's degree" (Adelman, 2006,…

  1. CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES: Self-consistent nonlinear analysis of a frequency-quadrupling terahertz gyroklystron

    NASA Astrophysics Data System (ADS)

    Liu, Di-Wei; Yuan, Xue-Song; Yan, Yang; Liu, Sheng-Gang

    2009-12-01

    This paper analyses a three-cavity frequency-quadrupling terahertz gyroklystron with successive frequency-doubling in each cavity with self-consistent nonlinear theory. The beam-wave interaction efficiency and the electron bunching process are studied. The variation of output efficiency with the length of drift tubes and output power and the variation of Ohmic loss with the length of output cavity are considered. Numerical simulations predict an optimal output efficiency of 1.8%, a power output of more than 2 kW and a gain of 33 dB after taking into account Ohmic losses when the frequency-quadrupling gyroklystron, driven by a 40-kV, 3-A electron beam and 1 Watt input power, operates at 225 GHz.

  2. CONDENSED MATTER: STRUCTURE, THERMAL AND MECHANICAL PROPERTIES: Polarized spin transport in mesoscopic quantum rings with electron-phonon and Rashba spin-orbit coupling

    NASA Astrophysics Data System (ADS)

    Liu, Ping; Xiong, Shi-Jie

    2009-12-01

    The influence of electron-phonon (EP) scattering on spin polarization of current output from a mesoscopic ring with Rashba spin-orbit (SO) interaction is numerically investigated. There are three leads connecting to the ring at different positions; unpolarized current is injected to one of them, and the other two are output channels with different bias voltages. The spin polarization of current in the outgoing leads shows oscillations as a function of EP coupling strength owing to the quantum interference of EP states in the ring region. As temperature increases, the oscillations are evidently suppressed, implying decoherence of the EP states. The simulation shows that the magnitude of polarized current is sensitive to the location of the lead. The polarized current depends on the connecting position of the lead in a complicated way due to the spin-sensitive quantum interference effects caused by different phases accumulated by transmitting electrons with opposite spin states along different paths.

  3. INTERACTION OF LASER RADIATION WITH MATTER: Luminescence of crystals excited by a KrCl laser and a subnanosecond electron beam

    NASA Astrophysics Data System (ADS)

    Lipatov, E. I.; Tarasenko, Viktor F.; Orlovskii, Viktor M.; Alekseev, S. B.

    2005-08-01

    Luminescence of crystals of natural spodumene and natural diamond of the type IIa is studied upon excitation by a laser at a wavelength of 222 nm and by a subnanosecond avalanche electron beam (SAEB) formed in air at the atmospheric pressure. The photoluminescence spectra of spodumene and diamond are shown to exhibit additional bands, which are absent upon SAEB excitation. It is demonstrated that SAEB excitation allows one to analyse various crystals under normal conditions without using any vacuum equipment.

  4. Issues in Equation of State data generation for Hot Dense MatterA Note on Generalized Radial Mesh Generation for Plasma Electronic Structure

    SciTech Connect

    Wilson, B G; Sonnad, V

    2011-02-14

    Precise electronic structure calculations of ions in plasmas benefit from optimized numerical radial meshes. A new closed form expression for obtaining non-linear parameters for the efficient generation of analytic log-linear radial meshes is presented. In conjunction with the (very simple) algorithm for the rapid high precision evaluation of Lambert's W-function, the above identity allows the precise construction of generalized log-linear radial meshes adapted to various constraints.

  5. Fast Crystallization and Improved Stability of Perovskite Solar Cells with Zn2SnO4 Electron Transporting Layer: Interface Matters.

    PubMed

    Bera, Ashok; Sheikh, Arif D; Haque, Md Azimul; Bose, Riya; Alarousu, Erkki; Mohammed, Omar F; Wu, Tom

    2015-12-30

    Here we report that mesoporous ternary oxide Zn2SnO4 can significantly promotes the crystallization of hybrid perovskite layers and serves as an efficient electron transporting material in perovskite solar cells. Such devices exhibit an energy conversion efficiency of 13.34%, which is even higher than that achieved with the commonly used TiO2 in the similar experimental conditions (9.1%). Simple one-step spin coating of CH3NH3PbI3-xClx on Zn2SnO4 is found to lead to rapidly crystallized bilayer perovskite structure without any solvent engineering. Furthermore, ultrafast transient absorption measurement reveals efficient charge transfer at the Zn2SnO4/perovskite interface. Most importantly, solar cells with Zn2SnO4 as the electron-transporting material exhibit negligible electrical hysteresis and exceptionally high stability without encapsulation for over one month. Besides underscoring Zn2SnO4 as a highly promising electron transporting material for perovskite solar cells, our results demonstrate the significant role of interfaces on improving the perovskite crystallization and photovoltaic performance.

  6. Plasma dark matter direct detection

    SciTech Connect

    Clarke, J.D.; Foot, R. E-mail: rfoot@unimelb.edu.au

    2016-01-01

    Dark matter in spiral galaxies like the Milky Way may take the form of a dark plasma. Hidden sector dark matter charged under an unbroken U(1)' gauge interaction provides a simple and well defined particle physics model realising this possibility. The assumed U(1)' neutrality of the Universe then implies (at least) two oppositely charged dark matter components with self-interactions mediated via a massless 'dark photon' (the U(1)' gauge boson). In addition to nuclear recoils such dark matter can give rise to keV electron recoils in direct detection experiments. In this context, the detailed physical properties of the dark matter plasma interacting with the Earth is required. This is a complex system, which is here modelled as a fluid governed by the magnetohydrodynamic equations. These equations are numerically solved for some illustrative examples, and implications for direct detection experiments discussed. In particular, the analysis presented here leaves open the intriguing possibility that the DAMA annual modulation signal is due primarily to electron recoils (or even a combination of electron recoils and nuclear recoils). The importance of diurnal modulation (in addition to annual modulation) as a means of probing this kind of dark matter is also emphasised.

  7. Dark matter detection

    NASA Astrophysics Data System (ADS)

    Baudis, Laura

    2016-08-01

    More than 80 years after its first postulation in modern form, the existence and distribution of dark matter in our Universe is well established. Dark matter is the gravitational glue that holds together galaxies, galaxy clusters and structures on the largest cosmological scales, and an essential component to explain the observed fluctuations in the cosmic microwave background. Yet its existence is inferred indirectly, through its gravitational influence on luminous matter, and its nature is not known. A viable hypothesis is that dark matter is made of new, elementary particles, with allowed masses and interaction strengths spanning a wide range. Two well-motivated classes of candidates are axions and weakly interacting massive particles (WIMPs), and experimental efforts have now reached sensitivities that allow them to test this hypothesis. Axions, produced non-thermally in the early Universe, can be detected by exploiting their predicted couplings to photons and electrons. WIMPs can be detected directly by looking for their collisions with atomic nuclei ultra-low background detectors, or indirectly, through the observation of their annihilation products such as neutrinos, gamma rays, positrons and antiprotons over the astrophysical background. A complementary method is the production of dark matter particles at colliders such as the Large Hadron Collider, where they could be observed indirectly via missing transverse energy, or via associated particle production. I will review the main experimental efforts to search for dark matter particles, and the existing constraints on the interaction cross sections. I will also discuss future experiments, their complementarity and their ability to measure the properties of these particles.

  8. Guidance Matters

    ERIC Educational Resources Information Center

    Gartrell, Dan

    2006-01-01

    Conflicts happen all the time in early childhood classrooms--and just about everywhere else in life. Conflict management includes the ability to: (1) prevent conflicts from becoming too serious to resolve easily and (2) resolve conflicts peaceably no matter how serious they get. When a third person assists others in resolving a conflict, this is…

  9. Changes Matter!

    ERIC Educational Resources Information Center

    Lott, Kimberly; Jensen, Anitra

    2012-01-01

    Being able to distinguish between physical and chemical changes of matter is a foundational chemistry concept that at first seems like a simple elementary concept to teach, but students often have misconceptions that hinder their understanding. These misconceptions are seen among elementary students, but these ideas are perpetuated throughout…

  10. CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES: A Peak in Density Dependence of Electron Spin Relaxation Time in n-Type Bulk GaAs in the Metallic Regime

    NASA Astrophysics Data System (ADS)

    Shen, Ka

    2009-06-01

    We demonstrate that the peak in the density dependence of electron spin relaxation time in n-type bulk GaAs in the metallic regime predicted by Jiang and Wu [Phys. Rev. B 79 (2009) 125206] has been realized experimentally in the latest work [arXiv:0902.0270] by Krauß et al.

  11. CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES: Realization of Spin Switch in a Triple-Terminal Double-Quantum-Dot Structure

    NASA Astrophysics Data System (ADS)

    Jiang, Cui

    2010-01-01

    Electron transport through a triple-terminal double-quantum-dot structure is theoretically studied. By adjusting the chemical potential in leads, two channels in this system are created, and in the presence of magnetic flux the conductances for the two channels present remarkable difference from each other. When the quantum dots are made of ferromagnetic materials, the levels of quantum dots are spin dependent, then spin polarization comes about in the two channels. Furthermore, in some regions spin polarization in the different channels are opposite. We consider that this model can be a device prototype for spin filtering and spin separation.

  12. CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES: Field Emission Properties of Ball-Like Nano-Carbon Thin Films Deposited on Mo Films with Accidented Topography

    NASA Astrophysics Data System (ADS)

    Wang, Long-Yang; Wang, Xiao-Ping; Wang, Li-Jun; Zhang, Lei

    2008-11-01

    Ball-like nano-carhon thin films (BNCTs) are grown on Mo layers by microwave plasma chemical vapour deposition (MPCVD) system. The Mo layers are deposited on ceramic substrates by electron beam deposition method and are pretreated by ultrasonically scratching. The optimization effects of ultrasonically scratching pretreat-ment on the surface micro-structures of carbon films are studied. It is found from field-emission scanning electron microscope (FE-SEM) images and Raman spectra that the surface structures of the carbon films deposited on Mo pretreated are improved, which are composed of highly uniform nano-structured carbon balls with considerable disorder structures. Field emission (FE) measurements are carried out using a diode structure. The experimental results indicate that the BNCTs exhibit good FE properties, which have the turn on field of 1.56 V/μm, and the current density of 1.0mA/cm2 at electric field of 4.0 V/μm, the uniformly distributed emission site density from a broad well-proportioned emission area of 4 cm2 are also obtained. Linearity is observed in Fowler-Nordheim (F-N) plots in higher Geld region, and the possible emission mechanism of BNCTs is discussed.

  13. INTERACTION OF LASER RADIATION WITH MATTER. LASER PLASMA: Efficiency of ablative loading of material upon the fast-electron transfer of absorbed laser energy

    NASA Astrophysics Data System (ADS)

    Gus'kov, Sergei Yu; Kasperczuk, A.; Pisarczyk, T.; Borodziuk, S.; Kalal, M.; Limpouch, J.; Ullschmied, J.; Krousky, E.; Masek, K.; Pfeifer, M.; Rohlena, K.; Skala, J.; Pisarczyk, P.

    2006-05-01

    We present the results of experiments on the short-term irradiation of a solid material by a laser beam. The data testify to a rise in efficiency of the energy transfer from the laser pulse to a shock wave due to the fast-electron energy transfer. The experiments were performed with massive aluminium targets on the PALS iodine laser, whose pulse duration (0.4 ns) was much shorter than the time of shock decay and crater formation in the target (50-200 ns). The irradiation experiments were carried out using the fundamental laser harmonic (1.315 μm) with an energy of 360 J. The greater part of the experiments were performed for the radiation intensity exceeding 1015 W cm-2, which corresponded to the efficient generation of fast electrons under the conditions where the relatively long-wavelength iodine-laser radiation was employed. The irradiation intensity was varied by varying the laser beam radius for a specified pulse energy.

  14. CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES: First Principles Study of Half Metallic Properties of VSb Surface and VSb/GaSb (001) Interface

    NASA Astrophysics Data System (ADS)

    Boochani, A.; Abolhasani, M. R.; Ghoranneviss, M.; Elahi, M.

    2010-07-01

    The structural, electronic, and magnetic properties of VSb in zincblende, and NiAs phases, VSb (001) film surfaces and its interfaces with GaSb (001) have been investigated within the framework of the density functional theory using the FPLAPW+lo approach. The NiAs structure is more stable than the ZB phase, ZB VSb is found to a half-metallic ferromagnetic. The V-terminated surfaces retain the half-metallic character, while the half-metallicity is destroyed for Sb-terminated surfaces due to surface states, which originate from p electrons. The phase diagram obtained through the ab-initio atomistic thermodynamics shows that the formation energy of ZB VSb is about 0.1 Ryd. The half-metallicity character is also preserved at VSb/GaSb (001) interface. The conduction band minimum (CBM) of VSb in the minority spin case lies about 0.47 eV above that of GaSb, suggesting that the majority spin can be injected into GaSb without being flipped to the conduction bands of the minority spin.

  15. Subpicosecond and Sub-Angstrom Time and Space Studies by Means of Light, X-ray, and Electron Interaction with Matter.

    PubMed

    Chen, Jie; Rentzepis, Peter M

    2014-01-02

    This Perspective article considers an experimental system that consists of ultrafast optical, electron, and X-ray time-resolved components. These techniques are used simultaneously on the same sample to study, in real time, the events that occur immediately upon disturbance with an ultrafast optical pulse. Excited states and metastable species are generated on the surface, and the electrical and mechanical waves propagating through the sample are recorded with subpicosecond and sub-Angstrom resolution. The characteristic of each technique is briefly described as a means of introducing the experimental system that intergrates these techniques. The processes evolved after femtosecond excitation of a Au single crystal have been monitored by these techniques. The data presented show changes with a resolution of 0.3 ± 0.1 ps in optical thermoreflectance, 1.0 ± 0.2 ps in electron Bragg diffraction, and 0.6 ± 0.1 ps in X-ray diffraction intensity accompanying shift and broadening.

  16. CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES: First-Principles Calculations of Atomic and Electronic Properties of Tl and In on Si(111)

    NASA Astrophysics Data System (ADS)

    Dai, Xian-Qi; Zhao, Jian-Hua; Sun, Yong-Can; Wei, Shu-Yi; Wei, Guo-Hong

    2010-09-01

    The atomic and electronic structures of Tl and In on Si(111) surfaces are investigated using the first-principles total energy calculations. Total energy optimizations show that the energetically favored structure is 1/3 ML Tl adsorbed at the T4 sites on Si(111) surfaces. The adsorption energy difference of one Tl adatom between (√3 × √3) and (1 × 1) is less than that of each In adatom. The DOS indicates that Tl 6p and Si 3p electrons play a very important role in the formation of the surface states. It is concluded that the bonding of Tl adatoms on Si(111) surfaces is mainly polar covalent, which is weaker than that of In on Si(111). So Tl atom is more easy to be migrated than In atom in the same external electric field and the structures of Tl on Si(111) is prone to switch between (√3 × √3) and (1 × 1).

  17. CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES: First-Principles Study of Structural, Elastic and Electronic Properties of OsSi

    NASA Astrophysics Data System (ADS)

    Li, Jin; Linghu, Rong-Feng; Yang, Ze-Jin; Cao, Yang; Yang, Xiang-Dong

    2009-10-01

    First-principles study of structural, elastic, and electronic properties of the B20 structure OsSi has been reported using the plane-wave pseudopotential density functional theory method. The calculated equilibrium lattice and elastic constants are in good agreement with the experimental data and other theoretical results. The dependence of the elastic constants, the aggregate elastic modulus, the deviation from the Cauchy relation, the elastic wave velocities in different directions and the elastic anisotropy on pressure have been obtained and discussed. This could be the first quantitative theoretical prediction of the elastic properties under high pressure of OsSi compound. Moreover, the electronic structure calculations show that OsSi is a degenerate semiconductor with the gap value of 0.68 eV, which is higher than the experimental value of 0.26 eV. The analysis of the PDOS reveals that hybridization between Os d and Si p states indicates a certain covalency of the Os-Si bonds.

  18. Dark matter

    PubMed Central

    Peebles, P. James E.

    2015-01-01

    The evidence for the dark matter (DM) of the hot big bang cosmology is about as good as it gets in natural science. The exploration of its nature is now led by direct and indirect detection experiments, to be complemented by advances in the full range of cosmological tests, including judicious consideration of the rich phenomenology of galaxies. The results may confirm ideas about DM already under discussion. If we are lucky, we also will be surprised once again. PMID:24794526

  19. CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES: Effect of Temperature on Structural and Magnetic Properties of Laser Ablated Iron Oxide Deposited on Si(100)

    NASA Astrophysics Data System (ADS)

    Shahid, Ramay M.; Saadat, Siddiqi A.; M. Sabieh, Anwar; Shin C., S.

    2009-11-01

    We fabricate Fe3O4 thin films on Si(100) substrates at different temperatures using pulsed laser deposition, and study the effect of annealing and deposition temperature on the structural and magnetic properties of Fe3O4 thin films. Subsequently, the films are characterized by x-ray diffraction (XRD), scanning electron microscopy (SEM) and vibrating sample magnetometery (VSM). The XRD results of these films confirm the presence of the Fe3O4 phase and show room-temperature ferromagnetism, as observed with VSM. We demonstrate the optimized deposition and annealing conditions for an enhanced magnetization of 854 emu/cm3 that is very high when compared to the bulk sample.

  20. CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES: Room-Temperature Anisotropic Ferromagnetism in Fe-Doped In2O3 Heteroepitaxial Films

    NASA Astrophysics Data System (ADS)

    Xing, Peng-Fei; Chen, Yan-Xue; Tang, Min-Jian; Yan, Shi-Shen; Liu, Guo-Lei; Mei, Liang-Mo; Jiao, Jun

    2009-11-01

    Fe-doped In2O3 films are grown epitaxially on YSZ (100) substrates by pulsed laser deposition. The in-situ reflection high-energy electron diffraction, the atomic force microscopy, and the x-ray diffraction patterns show that the films have a well defined cubic structure epitaxially oriented in the (100) direction. Room temperature ferromagnetism is observed by an alternating gradient magnetometer. Strong perpendicular magnetic anisotropy with a remnant magnetization ratio of 0.83 and a coercivity of 2.5kOe is revealed. Both the structural and the magnetic measurements suggest that this ferromagnetism is an intrinsic property deriving from the spin-orbit coupling between the diluted Fe atoms.

  1. CONDENSED MATTER: STRUCTURE, THERMAL AND MECHANICAL PROPERTIES: First-principles calculations on the electronic and vibrational properties of β-V2O5

    NASA Astrophysics Data System (ADS)

    Zhou, Bo; Su, Qing; He, De-Yan

    2009-11-01

    Using a first-principles approach based on density functional theory, this paper studies the electronic and dynamical properties of β-V2O5. A smaller band gap and much wider split-off bands have been observed in comparison with α-V2O5. The Raman- and infrared-active modes at the Γ point of the Brillouin zone are evaluated with LO/TO splitting, where the symbol denotes the longitudinal and transverse optical model. The nonresonant Raman spectrum of a β-V2O5 powder sample is also computed, providing benchmark theoretical results for the assignment of the experimental spectrum. The computed spectrum agrees with the available experimental data very well. This calculation helps to gain a better understanding of the transition from α- to β-V2O5.

  2. CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES: Various Recipes of SiNx Passivated AlGaN/GaN High Electron Mobility Transistors in Correlation with Current Slump

    NASA Astrophysics Data System (ADS)

    Yang, Ling; Hao, Yue; Ma, Xiao-Hua; Quan, Si; Hu, Gui-Zhou; Jiang, Shou-Gao; Yang, Li-Yuan

    2009-11-01

    The current slump of different recipes of SiNx passivated AlGaN/GaN high electron mobility transistors (HEMTs) is investigated. The dc and pulsed current-voltage curves of AlGaN/GaN HEMTs using different recipes are analyzed. It is found that passivation leakage has a strong relationship with NH3 flow in the plasma-enhanced chemical vapor phase deposition process, which has impacted on the current collapse of SiNx passivated devices. We analyze the pulsed IDS - VDS characteristics of different recipes of SiNx passivation devices for different combinations of gate and drain quiescent biases (VGS0, VDS0) of (0, 0), (-6, 0), (-6, 15) and (0, 15)V. The possible mechanisms are the traps in SiNx passivation capturing the electrons and the surface states at the SiNx/AlGaN interface, which can affect the channel of two-dimensional electron gas and cause the current collapse.

  3. CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES: Characterization of Ag adsorption on TiC(001) substrate: an ab initio study

    NASA Astrophysics Data System (ADS)

    Ma, Shang-Yi; Wang, Shao-Qing

    2008-10-01

    Ag adsorptions at 0.25-3 monolayer (ML) coverage on a perfect TiC(001) surface and at 0.25 ML coverage on C vacancy are separately investigated by using the pseudopotential-based density functional theory. The preferential adsorption sites and the adsorption-induced modifications of electronic structures of both the substrate and adsorbate are analysed. Through the analyses of adsorption energy, ideal work of separation, interface distance, projected local density of states, and the difference electron density, the characteristic evolution of the adatom-surface bonding as a function of the amount of deposited silver is studied. The nature of the Ag/TiC bonding changes as the coverage increases from 0.25 to 3 MLs. Unlike physisorption in an Ag/MgO system, polar covalent component contributes to the Ag/TiC interfacial adhesion in most cases, however, for the case of 1-3 ML coverage, an additional electrostatic interaction between the absorption layer and the substrate should be taken into account. The value of ideal work of separation, 1.55 J/m2 for a 3-ML-thick adlayer accords well with other calculations. The calculations predict that Ag does not wet TiC(001) surface and prefers a three-dimensional growth mode in the absence of kinetic factor. This work reports on a clear site and coverage dependence of the measurable physical parameters, which would benefit the understanding of Ag/TiC (001) interface and the analysis of experimental data.

  4. Dynamic Matter

    NASA Astrophysics Data System (ADS)

    Hohner, Jack

    2003-05-01

    First postulate: Following the Big Bang, quarks, born from zero point mass, did not acquire a constant size. They are growing. Atomic distances remain relative to increasing quark diameter resulting in molecular density remaining constant. Current rate of quark growth results in an increase of Earth radius of approximately 2.8 cm/year. The perpetual growth is sustained by the conversion of space to matter. The equality of space to matter is algebraically derived from Newton's law of gravity. There results an inward flow of space at each quark. This creates a vector field of space flowing inward at the Earth. Next postulate: Einstein space curvature is actually inward flow of space. Although this appears as an ether theory, it does not conflict with relativity. The combined vector fields of all stars in the universe create a scalar field equal to C. Inward velocity of space at the surface of the Earth is calculated at 1.46 cm/sec. This is derived from space curvature formula from relativity. This value accelerates toward the nucleus of each atom until it terminates at C at the diameter of a quark. These two predictions of the velocity C demonstrate why it is the universal constant. This work predicts the gravitational constant from a derivation based on C. Several unifying aspects emerge including; equivalence principle, 5 dimensions, time, strong nuclear force, decreasing rotational velocity of Earth, dark matter, red shift and quantum mechanics. This theory is an extension of Einstein and Newton.

  5. 5 CFR 534.505 - Pay related matters.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

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  6. 5 CFR 534.505 - Pay related matters.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

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  7. 5 CFR 534.505 - Pay related matters.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

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  8. 5 CFR 534.505 - Pay related matters.

    Code of Federal Regulations, 2012 CFR

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  9. 5 CFR 534.505 - Pay related matters.

    Code of Federal Regulations, 2013 CFR

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    ... 5 Administrative Personnel 1 2013-01-01 2013-01-01 false Pay related matters. 534.505 Section 534.505 Administrative Personnel OFFICE OF PERSONNEL MANAGEMENT CIVIL SERVICE REGULATIONS PAY UNDER OTHER SYSTEMS Pay for Senior-Level and Scientific and Professional Positions § 534.505 Pay related matters....

  10. 17 CFR 10.41 - Prehearing conferences; procedural matters.

    Code of Federal Regulations, 2011 CFR

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  11. 7 CFR 1412.50 - Matters of general applicability.

    Code of Federal Regulations, 2011 CFR

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  12. 7 CFR 1412.50 - Matters of general applicability.

    Code of Federal Regulations, 2013 CFR

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  13. 7 CFR 1412.50 - Matters of general applicability.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

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  14. 19 CFR 174.11 - Matters subject to protest.

    Code of Federal Regulations, 2012 CFR

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  15. 15 CFR 766.11 - Matter protected against disclosure.

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  16. 7 CFR 1412.50 - Matters of general applicability.

    Code of Federal Regulations, 2014 CFR

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  17. 28 CFR 0.71 - Delegation respecting immunity matters.

    Code of Federal Regulations, 2011 CFR

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  18. 17 CFR 10.41 - Prehearing conferences; procedural matters.

    Code of Federal Regulations, 2013 CFR

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    ...; procedural matters. 10.41 Section 10.41 Commodity and Securities Exchanges COMMODITY FUTURES TRADING... Prehearing conferences; procedural matters. In any proceeding the Administrative Law Judge may direct that...) Determining matters of which official notice may be taken; (d) Discussing amendments to pleadings;...

  19. 19 CFR 174.11 - Matters subject to protest.

    Code of Federal Regulations, 2011 CFR

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    ... 19 Customs Duties 2 2011-04-01 2011-04-01 false Matters subject to protest. 174.11 Section 174.11... TREASURY (CONTINUED) PROTESTS Protests § 174.11 Matters subject to protest. The following decisions of CBP... administrative decisions involving the following subject matters are subject to protest: (1) The appraised...

  20. 19 CFR 174.11 - Matters subject to protest.

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  1. 28 CFR 0.71 - Delegation respecting immunity matters.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... 28 Judicial Administration 1 2012-07-01 2012-07-01 false Delegation respecting immunity matters. 0... JUSTICE Tax Division § 0.71 Delegation respecting immunity matters. The Assistant Attorney General in charge of the Tax Division is authorized to handle matters involving the immunity of the...

  2. 15 CFR 766.11 - Matter protected against disclosure.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ... 15 Commerce and Foreign Trade 2 2013-01-01 2013-01-01 false Matter protected against disclosure... ADMINISTRATIVE ENFORCEMENT PROCEEDINGS § 766.11 Matter protected against disclosure. (a) Protective measures. It... determines that documents containing the sensitive matter need to be made available to a respondent to...

  3. 19 CFR 174.11 - Matters subject to protest.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ... 19 Customs Duties 2 2013-04-01 2013-04-01 false Matters subject to protest. 174.11 Section 174.11... TREASURY (CONTINUED) PROTESTS Protests § 174.11 Matters subject to protest. The following decisions of CBP... administrative decisions involving the following subject matters are subject to protest: (1) The appraised...

  4. 7 CFR 1412.50 - Matters of general applicability.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ... 7 Agriculture 10 2012-01-01 2012-01-01 false Matters of general applicability. 1412.50 Section... and Peanuts 2008 through 2012 § 1412.50 Matters of general applicability. These regulations and CCC's... matters of general applicability and are not individually appealable in administrative appeals...

  5. 28 CFR 0.71 - Delegation respecting immunity matters.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... 28 Judicial Administration 1 2014-07-01 2014-07-01 false Delegation respecting immunity matters. 0... JUSTICE Tax Division § 0.71 Delegation respecting immunity matters. The Assistant Attorney General in charge of the Tax Division is authorized to handle matters involving the immunity of the...

  6. 15 CFR 766.11 - Matter protected against disclosure.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ... 15 Commerce and Foreign Trade 2 2012-01-01 2012-01-01 false Matter protected against disclosure... ADMINISTRATIVE ENFORCEMENT PROCEEDINGS § 766.11 Matter protected against disclosure. (a) Protective measures. It... determines that documents containing the sensitive matter need to be made available to a respondent to...

  7. 17 CFR 10.41 - Prehearing conferences; procedural matters.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...; procedural matters. 10.41 Section 10.41 Commodity and Securities Exchanges COMMODITY FUTURES TRADING... Prehearing conferences; procedural matters. In any proceeding the Administrative Law Judge may direct that...) Determining matters of which official notice may be taken; (d) Discussing amendments to pleadings;...

  8. 17 CFR 10.41 - Prehearing conferences; procedural matters.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...; procedural matters. 10.41 Section 10.41 Commodity and Securities Exchanges COMMODITY FUTURES TRADING... Prehearing conferences; procedural matters. In any proceeding the Administrative Law Judge may direct that...) Determining matters of which official notice may be taken; (d) Discussing amendments to pleadings;...

  9. 28 CFR 0.71 - Delegation respecting immunity matters.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 28 Judicial Administration 1 2010-07-01 2010-07-01 false Delegation respecting immunity matters. 0... JUSTICE Tax Division § 0.71 Delegation respecting immunity matters. The Assistant Attorney General in charge of the Tax Division is authorized to handle matters involving the immunity of the...

  10. 15 CFR 766.11 - Matter protected against disclosure.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... 15 Commerce and Foreign Trade 2 2010-01-01 2010-01-01 false Matter protected against disclosure... ADMINISTRATIVE ENFORCEMENT PROCEEDINGS § 766.11 Matter protected against disclosure. (a) Protective measures. It... determines that documents containing the sensitive matter need to be made available to a respondent to...

  11. 28 CFR 0.71 - Delegation respecting immunity matters.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... 28 Judicial Administration 1 2013-07-01 2013-07-01 false Delegation respecting immunity matters. 0... JUSTICE Tax Division § 0.71 Delegation respecting immunity matters. The Assistant Attorney General in charge of the Tax Division is authorized to handle matters involving the immunity of the...

  12. CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES: Inverse Spin Hall Effect in Two-Terminal Device with Rashba Spin-Orbit Coupling

    NASA Astrophysics Data System (ADS)

    Zhang, Jing-Jing; Liang, Feng; Yang, Yong-Hong; Wang, Jun

    2009-12-01

    We report a theoretic study on the inverse spin-Hall effect (ISHE) in a two-terminal nano-device that consists of a two-dimensional electron gas (2DEG) with Rashba spin-orbit coupling (RSOC) and two ideal leads. Based on a two-site toy model and Keldysh Green's function method, we derive an analytic result of ISHE, which shows clearly that a nonzero transverse charge current stems from the combined effect of the RSOC, the spin bias, and its spin polarization direction in spin space. Our further numerical calculations in a larger system other than two-site lattice model demonstrate that the transverse charge current, dependent on the strength of the RSOC, the Fermi energy of the system, as well as the system size, can exhibit oscillating behavior and even reverse its sign due to Rashba spin precession. These properties may be helpful for efficient detection of the spin current (spin bias) by measuring the transverse charge current in a spin-orbital coupling system.

  13. CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES: Splitting and Restoration of Kondo Peak in a Deformed Molecule Quantum Dot Coupled to Ferromagnetic Electrodes

    NASA Astrophysics Data System (ADS)

    Wang, Rui-Qiang; Jiang, Kai-Ming

    2010-02-01

    We adopt the nonequilibrium Green's function method to theoretically study the Kondo effect in a deformed molecule, which is treated as an electron-phonon interaction (EPI) system. The self-energy for phonon part is calculated in the standard many-body diagrammatic expansion up to the second order in EPI strength. We find that the multiple phonon-assisted Kondo satellites arise besides the usual Kondo resonance. In the antiparallel magnetic configuration the splitting of main Kondo peak and phonon-assisted satellites only happen for asymmetrical dot-lead couplings, but it is free from the symmetry for the parallel magnetic configuration. The EPI strength and vibrational frequency can enhance the spin splitting of both main Kondo and satellites. It is shown that the suppressed zero-bias Kondo resonance can be restored by applying an external magnetic field, whose magnitude is dependent on the phononic effect remarkably. Although the asymmetry in tunnel coupling has no contribution to the restoration of spin splitting of Kondo peak, it can shrink the external field needed to switch tunneling magnetoresistance ratio between large negative dip and large positive peak.

  14. CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES: Stark Effect Dependence on Hydrogenic Impurities in GaAs Parabolic Quantum-Well Wires

    NASA Astrophysics Data System (ADS)

    Wang, Sheng; Wei, Guo-Zhu; Han, Yu

    2009-11-01

    The ground-state and lowest excited-state binding energies of a hydrogenic impurity in GaAs parabolic quantum-well wires (QWWs) subjected to external electric and magnetic fields are investigated using the finite-difference method within the quasi-one-dimensional effective potential model. We define an effective radius ρeff of a cylindrical QWW, which can describe the strength of the lateral confinement. For the ground state, the position of the largest probability density of electron in x-y plane is located at a point, while for the lowest excited state, is located on a circularity whose radius is ρeff. The point and circularity are pushed along the left half of the center axis of the quantum-well wire by the electric field directed along the right half. When an impurity is located at the point or within the circularity, the ground-state or lowest excited-state binding energies are the largest; when the impurity is apart from the point or circularity, the ground-state or lowest excited-state binding energies start to decrease.

  15. CONDENSED MATTER: ELECTRONICSTRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICALPROPERTIES: First-Principles Study of Structural Stabilities, Electronic and Optical Properties of SrF2 under High Pressure

    NASA Astrophysics Data System (ADS)

    Hao, Ai-Min; Yang, Xiao-Cui; Li, Jie; Xin, Wei; Zhang, Su-Hong; Zhang, Xin-Yu; Liu, Ri-Ping

    2009-07-01

    An investigation of structural stabilities, electronic and optical properties of SrF2 under high pressure is conducted using a first-principles calculation based on density functional theory (DFT) with the plane wave basis set as implemented in the CASTEP code. Our results predict that the second high-pressure phase of SrF2 is of a Ni2In-type structure, and demonstrate that the sequence of the pressure-induced phase transition of SrF2 is the fluorite structure (Fm3m) to the PbCl2-type structure (Pnma), and to the Ni2In-type phase (P63/mmc). The first and second phase transition pressures are 5.77 and 45.58 GPa, respectively. The energy gap increases initially with pressure in the Fm3m, and begins to decrease in the Pnma phases at 30 GPa. The band gap overlap metallization does not occur up to 210 GPa. The pressure effect on the optical properties is discussed.

  16. Insights into complexation of dissolved organic matter and Al(III) and nanominerals formation in soils under contrasting fertilizations using two-dimensional correlation spectroscopy and high resolution-transmission electron microscopy techniques.

    PubMed

    Wen, Yongli; Li, Huan; Xiao, Jian; Wang, Chang; Shen, Qirong; Ran, Wei; He, Xinhua; Zhou, Quansuo; Yu, Guanghui

    2014-09-01

    Understanding the organomineral associations in soils is of great importance. Using two-dimensional correlation spectroscopy (2DCOS) and high resolution-transmission electron microscopy (HRTEM) techniques, this study compared the binding characteristics of organic ligands to Al(III) in dissolved organic matter (DOM) from soils under short-term (3-years) and long-term (22-years) fertilizations. Three fertilization treatments were examined: (i) no fertilization (Control), (ii) chemical nitrogen, phosphorus and potassium (NPK), and (iii) NPK plus swine manure (NPKM). Soil spectra detected by the 2DCOS Fourier transform infrared (FTIR) spectroscopy showed that fertilization modified the binding characteristics of organic ligands to Al(III) in soil DOM at both short- and long- term location sites. The CH deformations in aliphatic groups played an important role in binding to Al(III) but with minor differences among the Control, NPK and NPKM at the short-term site. While at the long-term site both C-O stretching of polysaccharides or polysaccharide-like substances and aliphatic O-H were bound to Al(III) under the Control, whereas only aliphatic O-H, and only polysaccharides and silicates, were bound to Al(III) under NPK and NPKM, respectively. Images from HRTEM demonstrated that crystalline nanominerals, composed of Fe and O, were predominant in soil DOM under NPK, while amorphous nanominerals, predominant in Al, Si, and O, were dominant in soil DOM under Control and NPKM. In conclusion, fertilization strategies, especially under long-term, could affect the binding of organic ligands to Al(III) in soil DOM, which resulted in alterations in the turnover, reactivity, and bioavailability of soil organic matter. Our results demonstrated that the FTIR-2DCOS combined with HRTEM techniques could enhance our understanding in the binding characteristics of DOM to Al(III) and the resulted nanominerals in soils.

  17. Chemical Characterization of Outdoor and Subway Fine (PM2.5–1.0) and Coarse (PM10–2.5) Particulate Matter in Seoul (Korea) by Computer-Controlled Scanning Electron Microscopy (CCSEM)

    PubMed Central

    Byeon, Sang-Hoon; Willis, Robert; Peters, Thomas M.

    2015-01-01

    Outdoor and indoor (subway) samples were collected by passive sampling in urban Seoul (Korea) and analyzed with computer-controlled scanning electron microscopy coupled with energy dispersive x-ray spectroscopy (CCSEM-EDX). Soil/road dust particles accounted for 42%–60% (by weight) of fine particulate matter larger than 1 µm (PM2.5–1.0) in outdoor samples and 18% of PM2.5–1.0 in subway samples. Iron-containing particles accounted for only 3%–6% in outdoor samples but 69% in subway samples. Qualitatively similar results were found for coarse particulate matter (PM10–2.5) with soil/road dust particles dominating outdoor samples (66%–83%) and iron-containing particles contributing most to subway PM10–2.5 (44%). As expected, soil/road dust particles comprised a greater mass fraction of PM10–2.5 than PM2.5–1.0. Also as expected, the mass fraction of iron-containing particles was substantially less in PM10–2.5 than in PM2.5–1.0. Results of this study are consistent with known emission sources in the area and with previous studies, which showed high concentrations of iron-containing particles in the subway compared to outdoor sites. Thus, passive sampling with CCSEM-EDX offers an inexpensive means to assess PM2.5–1.0 and PM10-2.5 simultaneously and by composition at multiple locations. PMID:25689348

  18. 32 CFR 700.720 - Administration and discipline: Staff embarked.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 32 National Defense 5 2010-07-01 2010-07-01 false Administration and discipline: Staff embarked... Commanders In Chief and Other Commanders Administration and Discipline § 700.720 Administration and discipline: Staff embarked. In matters of general discipline, the staff of a commander embarked and...

  19. 29 CFR 458.70 - Administrative Law Judge.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 29 Labor 2 2010-07-01 2010-07-01 false Administrative Law Judge. 458.70 Section 458.70 Labor... STANDARDS OF CONDUCT Hearing and Related Matters § 458.70 Administrative Law Judge. Each enforcement proceeding instituted pursuant to this part shall be conducted before an Administrative Law Judge...

  20. 29 CFR 458.70 - Administrative Law Judge.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... 29 Labor 2 2014-07-01 2014-07-01 false Administrative Law Judge. 458.70 Section 458.70 Labor... STANDARDS OF CONDUCT Hearing and Related Matters § 458.70 Administrative Law Judge. Each enforcement proceeding instituted pursuant to this part shall be conducted before an Administrative Law Judge...

  1. CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES: Study on the degradation of NMOSFETs with ultra-thin gate oxide under channel hot electron stress at high temperature

    NASA Astrophysics Data System (ADS)

    Hu, Shi-Gang; Hao, Yue; Ma, Xiao-Hua; Cao, Yan-Rong; Chen, Chi; Wu, Xiao-Feng

    2009-12-01

    This paper studies the degradation of device parameters and that of stress induced leakage current (SILC) of thin tunnel gate oxide under channel hot electron (CHE) stress at high temperature by using n-channel metal oxide semiconductor field effect transistors (NMOSFETs) with 1.4-nm gate oxides. The degradation of device parameters under CHE stress exhibits saturating time dependence at high temperature. The emphasis of this paper is on SILC of an ultra-thin-gate-oxide under CHE stress at high temperature. Based on the experimental results, it is found that there is a linear correlation between SILC degradation and Vh degradation in NMOSFETs during CHE stress. A model of the combined effect of oxide trapped negative charges and interface traps is developed to explain the origin of SILC during CHE stress.

  2. Marginal Matter

    NASA Astrophysics Data System (ADS)

    van Hecke, Martin

    2013-03-01

    All around us, things are falling apart. The foam on our cappuccinos appears solid, but gentle stirring irreversibly changes its shape. Skin, a biological fiber network, is firm when you pinch it, but soft under light touch. Sand mimics a solid when we walk on the beach but a liquid when we pour it out of our shoes. Crucially, a marginal point separates the rigid or jammed state from the mechanical vacuum (freely flowing) state - at their marginal points, soft materials are neither solid nor liquid. Here I will show how the marginal point gives birth to a third sector of soft matter physics: intrinsically nonlinear mechanics. I will illustrate this with shock waves in weakly compressed granular media, the nonlinear rheology of foams, and the nonlinear mechanics of weakly connected elastic networks.

  3. CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES: Energetics and electronic structure of a single copper atomic chain wrapped in a carbon nanotube: a first-principles study

    NASA Astrophysics Data System (ADS)

    Zhang, Jian-Min; Du, Xiu-Juan; Wang, Su-Fang; Xu, Ke-Wei

    2009-12-01

    In the generalized gradient approximation, the energy and electronic structure are investigated for a single copper atomic chain wrapped in (4, 4), (5, 5) and (6, 6) armchair carbon nanotubes by using the first-principles projector-augmented wave potential within the framework of density functional theory. The results show that the (4, 4) and (5, 5) tubes are too narrow to wrap a Cu chain, but the (6, 6) tube is nearly ideal to wrap a Cu chain on its centre axis. Wider tubes are anticipated to wrap more than one Cu chain spontaneously with forces amounting to a fraction of a nanonewton. Although the tube-chain interaction decreases with the increase of the tube diameter of (4, 4), (5, 5) and (6, 6) successively, the charge density of the Cu@(6, 6) combined system still does not show complete superposition of that of the pristine (6, 6) tube and Cu chain. Successively reducing the restrictions of (4, 4), (5, 5) and (6, 6) tubes on the Cu chain leads to a reduction in shift of the highest peak of the Cu chain towards lower energies, that is from -0.5177 eV of the isolated Cu chain to -1.36785 eV, -0.668 eV and -0.588 eV for the Cu@(4, 4), Cu@(5, 5) and Cu@(6, 6) systems, respectively. In reverse, the strong metallic character of the Cu chain also enhances the metallic character of the combined systems so that the broader pseudogaps of the pristine carbon nanotubes around the Fermi level change into the narrow pseudogaps of the combined systems.

  4. DAMIC: a novel dark matter experiment

    SciTech Connect

    Tiffenberg, Javier; Bertou, Xavier; Butner, Melissa J.; Cancelo, Gustavo; Chavarria, Alvaro; D'Olivo, Juan Carlos; Estrada Vigil, Juan Cruz; Moroni, Guillermo Fernandez; Izraelevitch, Federico; Kilminster, Ben; Lawson, Ian T.; Marsal, Fernando; Molina, Jorge; Privitera, Paolo; Schwarz, Tom; Sofo haro, Miguel; Tiffenberg, Javier; Trillaud, Frederic; Zhou, Jing

    2013-10-24

    DAMIC (Dark Matter in CCDs) is a novel dark matter experiment that has unique sensitivity to dark matter particles with masses below 10 GeV. Due to its low electronic readout noise (R.M.S. ~3 e-) this instrument is able to reach a detection threshold below 0.5 keV nuclear recoil energy, making the search for dark matter particles with low masses possible. We report on early results and experience gained from a detector that has been running at SNOLAB from Dec 2012. We also discuss the measured and expected backgrounds and present the plan for future detectors to be installed in 2014.

  5. Senior Administrators Should Have Administrative Contracts.

    ERIC Educational Resources Information Center

    Posner, Gary J.

    1987-01-01

    Recognizing that termination is viewed by the employee as the equivalent to capital punishment of a career, an administrative contract can reduce the emotional and financial entanglements that often result. Administrative contracts are described. (MLW)

  6. Age matters.

    PubMed

    McCutcheon, James Edgar; Marinelli, Michela

    2009-03-01

    The age of an experimental animal can be a critical variable, yet age matters are often overlooked within neuroscience. Many studies make use of young animals, without considering possible differences between immature and mature subjects. This is especially problematic when attempting to model traits or diseases that do not emerge until adulthood. In this commentary we discuss the reasons for this apparent bias in age of experimental animals, and illustrate the problem with a systematic review of published articles on long-term potentiation. Additionally, we review the developmental stages of a rat and discuss the difficulty of using the weight of an animal as a predictor of its age. Finally, we provide original data from our laboratory and review published data to emphasize that development is an ongoing process that does not end with puberty. Developmental changes can be quantitative in nature, involving gradual changes, rapid switches, or inverted U-shaped curves. Changes can also be qualitative. Thus, phenomena that appear to be unitary may be governed by different mechanisms at different ages. We conclude that selection of the age of the animals may be critically important in the design and interpretation of neurobiological studies.

  7. Mind Over Matter: Cocaine

    MedlinePlus

    ... Over Matter Teaching Guide and Series / Cocaine Print Mind Over Matter: Cocaine Order Free Publication in: English ... how drugs affect the brain and nervous system. Mind Over Matter is produced by the National Institute ...

  8. An Overview of Some Electronic Identification Use Cases in Europe

    NASA Astrophysics Data System (ADS)

    Mattatia, Fabrice

    As online services become more and more widely used, and as the exchanges of personal data become more and more widespread, electronic identification appears to be a key function for the security of the process and for the protection of privacy. It is the sole means of ensuring only authorized people have access to the data. In France and throughout Europe, e-government services, as well as private services, already use different means of electronic identification. Among the different technical solutions stand the electronic identity card: around 20 million eID cards have already been issued in Europe. The question of their interoperability is now open, in order that all European citizens may access the e-services of any Member State. With the development of electronic administration comes the need for the citizen to be able to prove his or her identity. This is essential if the citizen wants access to her personal data or administrative files, or if he wants to claim a right attached to his very identity. On the other hand, administrations have the obligation to ensure the personal data they store are not displayed to people who are not entitled to see them. They also have the need to detect fraudsters. Electronic identification, which is the ability to prove someone's identity on the Internet, thus becomes a central matter.

  9. Microvasculature of the human cerebral white matter: arteries of the deep white matter.

    PubMed

    Nonaka, Hiroko; Akima, Michio; Hatori, Tsutomu; Nagayama, Tadashi; Zhang, Zean; Ihara, Fumie

    2003-06-01

    The vascular architecture of the human cerebral deep white matter was studied using soft X-ray and diaphanized specimens, achieved by intra-arterial injection of barium and vascular stain respectively, and also by electron microscopic examination of the corrosion cast of arteries in normal adult brains. The deep white matter arteries passed through the cerebral cortex with a few branches to the cortex and ran straight through the white matter. The arteries concentrated ventriculopetally to the white matter around the lateral ventricle. Anastomoses were noted around the ventricular wall at the terminals of the deep white matter arteries. No centrifugal branches irrigating the periventricular white matter from the lenticulo-striate arteries were observed in the present study. The presence of anastomoses among the terminal branches of deep white matter arteries protects against ischemic change or infarction in this area from an occlusion of a single deep white matter artery. This may lead to development of terminal zone infarction from ischemia or vascular diseases, affecting multiple deep white matter arteries. The subcortical and deep white matter arteries had thick adventitial sheaths and large adventitial spaces in the white matter but not in the cortex. The presence or absence of the adventitial space is regarded as another characteristic difference between the arteries in the white matter and cortex. This difference may influence pathological changes in vascular lesions in these respective areas.

  10. The DAMIC Dark Matter Experiment

    SciTech Connect

    de Mello Neto, J. R.T.

    2015-10-07

    The DAMIC (DArk Matter In CCDs) experiment uses high-resistivity, scientific-grade CCDs to search for dark matter. The CCD’s low electronic noise allows an unprecedently low energy threshold of a few tens of eV; this characteristic makes it possible to detect silicon recoils resulting from interactions of low-mass WIMPs. In addition, the CCD’s high spatial resolution and the excellent energy response results in very effective background identification techniques. The experiment has a unique sensitivity to dark matter particles with masses below 10 GeV/c2. Previous results have motivated the construction of DAMIC100, a 100 grams silicon target detector currently being installed at SNOLAB. The mode of operation and unique imaging capabilities of the CCDs, and how they may be exploited to characterize and suppress backgrounds are discussed, as well as physics results after one year of data taking.

  11. Veterans Health Administration

    MedlinePlus

    ... code here VA » Veterans Health Administration Veterans Health Administration Marine Continues to Serve by Serving Veterans David ... Read more » VA Medical Centers The Veterans Health Administration is home to the United States’ largest integrated ...

  12. The Microcomputer in the Administrative Office.

    ERIC Educational Resources Information Center

    Huntington, Fred

    1983-01-01

    Discusses microcomputer uses for administrative computing in education at site level and central office and recommends that administrators start with a word processing program for time management, an electronic spreadsheet for financial accounting, a database management system for inventories, and self-written programs to alleviate paper…

  13. 43 CFR 4.339 - Exceptions or comments regarding recommended decision by administrative law judge.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... Bureau of Indian Affairs: Administrative Review in Other Indian Matters Not Relating to Probate Proceedings § 4.339 Exceptions or comments regarding recommended decision by administrative law judge....

  14. 43 CFR 4.339 - Exceptions or comments regarding recommended decision by administrative law judge.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... Bureau of Indian Affairs: Administrative Review in Other Indian Matters Not Relating to Probate Proceedings § 4.339 Exceptions or comments regarding recommended decision by administrative law judge....

  15. 43 CFR 4.339 - Exceptions or comments regarding recommended decision by administrative law judge.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... Bureau of Indian Affairs: Administrative Review in Other Indian Matters Not Relating to Probate Proceedings § 4.339 Exceptions or comments regarding recommended decision by administrative law judge....

  16. 43 CFR 4.339 - Exceptions or comments regarding recommended decision by administrative law judge.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... Bureau of Indian Affairs: Administrative Review in Other Indian Matters Not Relating to Probate Proceedings § 4.339 Exceptions or comments regarding recommended decision by administrative law judge....

  17. 43 CFR 4.339 - Exceptions or comments regarding recommended decision by administrative law judge.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... Bureau of Indian Affairs: Administrative Review in Other Indian Matters Not Relating to Probate Proceedings § 4.339 Exceptions or comments regarding recommended decision by administrative law judge....

  18. Conducting compositions of matter

    NASA Technical Reports Server (NTRS)

    Viswanathan, Tito (Inventor)

    2000-01-01

    The invention provides conductive compositions of matter, as well as methods for the preparation of the conductive compositions of matter, solutions comprising the conductive compositions of matter, and methods of preparing fibers or fabrics having improved anti-static properties employing the conductive compositions of matter.

  19. Conducting Compositions of Matter

    NASA Technical Reports Server (NTRS)

    Viswanathan, Tito (Inventor)

    1999-01-01

    The invention provides conductive compositions of matter, as well as methods for the preparation of the conductive compositions of matter, solutions comprising the conductive compositions of matter, and methods of preparing fibers or fabrics having improved anti-static properties employing the conductive compositions of matter.

  20. Paine Appointed Administrator

    NASA Technical Reports Server (NTRS)

    1969-01-01

    President Richard M. Nixon announcing the appointment of Dr. Thomas O. Paine as Administrator for the National Aeronautics and Space Administration. The ceremony was held at the White House. Paine had been serving as acting administrator. From left to right: President Richard M. Nixon NASA Administrator Dr. Thomas O. Paine Vice President Spiro T. Agnew

  1. 28 CFR 0.157 - Federal Bureau of Investigation-Drug Enforcement Administration Senior Executive Service.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... 28 Judicial Administration 1 2011-07-01 2011-07-01 false Federal Bureau of Investigation-Drug... Administrative Matters § 0.157 Federal Bureau of Investigation—Drug Enforcement Administration Senior Executive... within the Federal Bureau of Investigation (FBI) and the Drug Enforcement Administration (DEA) to...

  2. 28 CFR 0.157 - Federal Bureau of Investigation-Drug Enforcement Administration Senior Executive Service.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... 28 Judicial Administration 1 2014-07-01 2014-07-01 false Federal Bureau of Investigation-Drug... Administrative Matters § 0.157 Federal Bureau of Investigation—Drug Enforcement Administration Senior Executive... within the Federal Bureau of Investigation (FBI) and the Drug Enforcement Administration (DEA) to...

  3. 28 CFR 0.157 - Federal Bureau of Investigation-Drug Enforcement Administration Senior Executive Service.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... 28 Judicial Administration 1 2012-07-01 2012-07-01 false Federal Bureau of Investigation-Drug... Administrative Matters § 0.157 Federal Bureau of Investigation—Drug Enforcement Administration Senior Executive... within the Federal Bureau of Investigation (FBI) and the Drug Enforcement Administration (DEA) to...

  4. 24 CFR 26.56 - Right to administrative offset.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... 24 Housing and Urban Development 1 2010-04-01 2010-04-01 false Right to administrative offset. 26....56 Right to administrative offset. The amount of any penalty or assessment that has become final... offset under 31 U.S.C. 3716 or other applicable law. In Program Fraud Civil Remedies Act matters,...

  5. 5 CFR 551.206 - Administrative exemption criteria.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ... judgment with respect to matters of significance merely because improper performance of the employee's... Administrative exemption criteria. An administrative employee is an employee whose primary duty is the performance of office or non-manual work directly related to the management or general business operations,...

  6. 5 CFR 551.206 - Administrative exemption criteria.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ... judgment with respect to matters of significance merely because improper performance of the employee's... Administrative exemption criteria. An administrative employee is an employee whose primary duty is the performance of office or non-manual work directly related to the management or general business operations,...

  7. 5 CFR 551.206 - Administrative exemption criteria.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ... judgment with respect to matters of significance merely because improper performance of the employee's... Administrative exemption criteria. An administrative employee is an employee whose primary duty is the performance of office or non-manual work directly related to the management or general business operations,...

  8. 5 CFR 551.206 - Administrative exemption criteria.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... judgment with respect to matters of significance merely because improper performance of the employee's... Administrative exemption criteria. An administrative employee is an employee whose primary duty is the performance of office or non-manual work directly related to the management or general business operations,...

  9. 5 CFR 551.206 - Administrative exemption criteria.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ... judgment with respect to matters of significance merely because improper performance of the employee's... Administrative exemption criteria. An administrative employee is an employee whose primary duty is the performance of office or non-manual work directly related to the management or general business operations,...

  10. 14 CFR 120.111 - Administrative and other matters.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... information system annual reports. Copies of any annual reports submitted to the FAA under this subpart must... information. An employer shall release information regarding an employee's drug testing results, evaluation... subpart, or 49 CFR part 40, no employer shall release employee information. (d) Refusal to submit...

  11. Requirements for Electronic Delivery Systems in eGovernment - An Austrian Experience

    NASA Astrophysics Data System (ADS)

    Tauber, Arne

    Electronic mailing systems are the dominant communication systems in private and business matters. Public administrations deliver documents to citizens and businesses - subpoenas, legal verdicts, notifications, administrative penalties etc. However, official activities are more strongly linked to legal regulations than in civil law. Delivery of crucial and strictly personal documents raises the demand for qualified identification and non-repudiation services as featured by registered mail in the paper world. Legal requirements for electronic delivery carried-out by public administrations (eDelivery) cannot be fulfilled by standard certified mailing systems. Although the requirements for eDelivery systems may differ due to national legal regulations, this paper discusses common requirements and challenges on an abstract level. Moreover, we show how these requirements have been addressed by introducing the Austrian eDelivery system for eGovernment applications.

  12. Detecting supernovae neutrino with Earth matter effect

    NASA Astrophysics Data System (ADS)

    Liao, Wei

    2016-12-01

    We study Earth matter effect in oscillations of supernovae neutrinos. We show that detecting Earth matter effect gives an independent measurement of spectra of supernovae neutrinos, i.e., the flavor difference of the spectra of supernovae neutrinos. We study the effect of energy resolution and angular resolution of a final electron or positron on detecting the signal of Earth matter effect. We show that varying the widths of energy bins in analysis can change the signal strength of Earth matter effect and the statistical fluctuation. A reasonable choice of energy bins can both suppress the statistical fluctuation and make a good signal strength relative to the statistical fluctuation. Neutrino detectors with good energy resolution and good angular resolution are therefore preferred so that there is more freedom to vary energy bins and to optimize the signal of Earth matter effect in analyzing events of supernovae neutrinos.

  13. Methodological Overview of the Parents Matter! Program

    ERIC Educational Resources Information Center

    Ball, Joanna; Pelton, Jennifer; Forehand, Rex; Long, Nicholas; Wallace, Scyatta A.

    2004-01-01

    We present an overview of the methodology employed in the Parents Matter! Program. Information on the following aspects of the program is presented: participant eligibility and recruitment; consenting procedures and administration of assessments; development and utilization of measures in the assessments; study design; intervention procedures;…

  14. 21 CFR 10.70 - Documentation of significant decisions in administrative file.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ... decision on any matter under the laws administered by the Commissioner, whether it is raised formally, for... handling a matter are responsible for insuring the completeness of the administrative file relating to it... supervisory personnel, responsible for handling the matter. (i) The recommendations and decisions are...

  15. 21 CFR 10.70 - Documentation of significant decisions in administrative file.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ... decision on any matter under the laws administered by the Commissioner, whether it is raised formally, for... handling a matter are responsible for insuring the completeness of the administrative file relating to it... supervisory personnel, responsible for handling the matter. (i) The recommendations and decisions are...

  16. 13 CFR 117.13 - Investigation and resolution of matters.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ... matters. 117.13 Section 117.13 Business Credit and Assistance SMALL BUSINESS ADMINISTRATION... 1975, AS AMENDED § 117.13 Investigation and resolution of matters. (a) SBA will make a prompt... enforcement as described in § 117.15. (3) If an investigation does not warrant action, SBA will so inform...

  17. 28 CFR 0.47 - Alien property matters.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... 28 Judicial Administration 1 2011-07-01 2011-07-01 false Alien property matters. 0.47 Section 0.47....47 Alien property matters. The Office of Alien Property shall be a part of the Civil Division: (a... Alien Property: (1) Exercising or performing all the authority, rights, privileges, powers, duties,...

  18. 28 CFR 0.47 - Alien property matters.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 28 Judicial Administration 1 2010-07-01 2010-07-01 false Alien property matters. 0.47 Section 0.47....47 Alien property matters. The Office of Alien Property shall be a part of the Civil Division: (a... Alien Property: (1) Exercising or performing all the authority, rights, privileges, powers, duties,...

  19. 28 CFR 0.47 - Alien property matters.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... 28 Judicial Administration 1 2012-07-01 2012-07-01 false Alien property matters. 0.47 Section 0.47....47 Alien property matters. The Office of Alien Property shall be a part of the Civil Division: (a... Alien Property: (1) Exercising or performing all the authority, rights, privileges, powers, duties,...

  20. 28 CFR 0.47 - Alien property matters.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... 28 Judicial Administration 1 2014-07-01 2014-07-01 false Alien property matters. 0.47 Section 0.47....47 Alien property matters. The Office of Alien Property shall be a part of the Civil Division: (a... Alien Property: (1) Exercising or performing all the authority, rights, privileges, powers, duties,...

  1. 28 CFR 0.47 - Alien property matters.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... 28 Judicial Administration 1 2013-07-01 2013-07-01 false Alien property matters. 0.47 Section 0.47....47 Alien property matters. The Office of Alien Property shall be a part of the Civil Division: (a... Alien Property: (1) Exercising or performing all the authority, rights, privileges, powers, duties,...

  2. Updated galactic radio constraints on Dark Matter

    SciTech Connect

    Cirelli, Marco; Taoso, Marco

    2016-07-25

    We perform a detailed analysis of the synchrotron signals produced by dark matter annihilations and decays. We consider different set-ups for the propagation of electrons and positrons, the galactic magnetic field and dark matter properties. We then confront these signals with radio and microwave maps, including PLANCK measurements, from a frequency of 22 MHz up to 70 GHz. We derive two sets of constraints: conservative and progressive, the latter based on a modeling of the astrophysical emission. Radio and microwave constraints are complementary to those obtained with other indirect detection methods, especially for dark matter annihilating into leptonic channels.

  3. Hidden photons in connection to dark matter

    NASA Astrophysics Data System (ADS)

    Andreas, Sarah; Goodsell, Mark D.; Ringwald, Andreas

    2013-11-01

    Light extra U(1) gauge bosons, so called hidden photons, which reside in a hidden sector have attracted much attention since they are a well motivated feature of many scenarios beyond the Standard Model and furthermore could mediate the interaction with hidden sector dark matter. We review limits on hidden photons from past electron beam dump experiments including two new limits from such experiments at KEK and Orsay. In addition, we study the possibility of having dark matter in the hidden sector. A simple toy model and different supersymmetric realisations are shown to provide viable dark matter candidates in the hidden sector that are in agreement with recent direct detection limits.

  4. 75 FR 65511 - Employee Benefits Security Administration; Submission for OMB Review

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-10-25

    ... of the Secretary Employee Benefits Security Administration; Submission for OMB Review ACTION: Notice..., Attn: OMB Desk Officer for the Department of Labor--Employee Benefits Security Administration (EBSA...., permitting electronic submission of responses. Agency: Employee Benefits Security Administration. Type...

  5. Transportation Security Administration

    MedlinePlus

    ... content Official website of the Department of Homeland Security Transportation Security Administration A - Z Index What Can I Bring? ... form Search the Site Main menu Administrator Travel Security Screening Special Procedures TSA Pre✓® Passenger Support Travel ...

  6. Administration on Aging

    MedlinePlus

    ... Federal Initiatives Career Opportunities Contact Us Administration on Aging (AoA) The Administration on Aging (AOA) is the ... themselves. Back to top Older Americans Act and Aging Network To meet the diverse needs of the ...

  7. Rehabilitation Services Administration

    MedlinePlus

    ... Contacts OSEP Reports & Resources RSA Welcome to RSA Rehabilitation Services Administration RSA Spotlight News Commissioner's Quarterly Newsletter ... The Office of Special Education and Rehabilitative Services’ Rehabilitation Services Administration is proud to announce the publication ...

  8. Administration on Aging

    MedlinePlus

    ... Administration on Aging Administration on Disabilities Center for Integrated Programs Center for Performance and Evaluation National Institute ... Project Aging Statistics Profile of Older Americans AGing Integrated Database (AGID) Census Data & Population Estimates Projected Future ...

  9. Legal and Administrative Language

    ERIC Educational Resources Information Center

    Schwarz, Hans

    1977-01-01

    A discussion of legal and administrative language, and the necessity for accurate translation of this language in the field of international relations. Topics treated are: characteristic features of legal and administrative terminology; the interpretation of it; and the technique of translating legal and administrative texts. (AMH)

  10. Women in Administration 1978.

    ERIC Educational Resources Information Center

    National Association of State Universities and Land Grant Colleges, Washington, DC. Office of Communications Services.

    In a survey by the National Association of State Universities and Land-Grant Colleges (NASULGC), women are shown to hold 2,905 of the 13,638 administrative positions reported by 106 major U.S. public universities--slightly more than 21 percent of the administrators at state and land-grant universities. The median number of women administrators at…

  11. School Business Administration.

    ERIC Educational Resources Information Center

    Jordan, K. Forbis; And Others

    This textbook reviews the principal concerns within each of 13 major responsibility areas in school business administration. The first chapter assesses the political, social, and economic context in which schools function and school administrators work. The role and function of the school business administrator within this context is addressed in…

  12. Why Arrhythmia Matters

    MedlinePlus

    ... Artery Disease Venous Thromboembolism Aortic Aneurysm More Why Arrhythmia Matters Updated:Dec 21,2016 When the heart's ... fibrillation. This content was last reviewed September 2016. Arrhythmia • Home • About Arrhythmia • Why Arrhythmia Matters • Understand Your ...

  13. Asymmetric dark matter

    SciTech Connect

    Kumar, Jason

    2014-06-24

    We review the theoretical framework underlying models of asymmetric dark matter, describe astrophysical constraints which arise from observations of neutron stars, and discuss the prospects for detecting asymmetric dark matter.

  14. States of Matter

    NASA Video Gallery

    NASA scientists and engineers utilize the basic principles of the states of matter on a daily basis. The states and properties of matter are very important to the design and construction of NASA sp...

  15. Nonthermal Supermassive Dark Matter

    NASA Technical Reports Server (NTRS)

    Chung, Daniel J. H.; Kolb, Edward W.; Riotto, Antonio

    1999-01-01

    We discuss several cosmological production mechanisms for nonthermal supermassive dark matter and argue that dark matter may he elementary particles of mass much greater than the weak scale. Searches for dark matter should ma be limited to weakly interacting particles with mass of the order of the weak scale, but should extend into the supermassive range as well.

  16. Impeded Dark Matter

    NASA Astrophysics Data System (ADS)

    Kopp, Joachim; Liu, Jia; Slatyer, Tracy R.; Wang, Xiao-Ping; Xue, Wei

    2016-12-01

    We consider dark matter models in which the mass splitting between the dark matter particles and their annihilation products is tiny. Compared to the previously proposed Forbidden Dark Matter scenario, the mass splittings we consider are much smaller, and are allowed to be either positive or negative. To emphasize this modification, we dub our scenario "Impeded Dark Matter". We demonstrate that Impeded Dark Matter can be easily realized without requiring tuning of model parameters. For negative mass splitting, we demonstrate that the annihilation cross-section for Impeded Dark Matter depends linearly on the dark matter velocity or may even be kinematically forbidden, making this scenario almost insensitive to constraints from the cosmic microwave background and from observations of dwarf galaxies. Accordingly, it may be possible for Impeded Dark Matter to yield observable signals in clusters or the Galactic center, with no corresponding signal in dwarfs. For positive mass splitting, we show that the annihilation cross-section is suppressed by the small mass splitting, which helps light dark matter to survive increasingly stringent constraints from indirect searches. As specific realizations for Impeded Dark Matter, we introduce a model of vector dark matter from a hidden SU(2) sector, and a composite dark matter scenario based on a QCD-like dark sector.

  17. DPIS for warm dense matter

    SciTech Connect

    Kondo, K.; Kanesue, T.; Horioka, K.; Okamura, M.

    2010-05-23

    Warm Dense Matter (WDM) offers an challenging problem because WDM, which is beyond ideal plasma, is in a low temperature and high density state with partially degenerate electrons and coupled ions. WDM is a common state of matter in astrophysical objects such as cores of giant planets and white dwarfs. The WDM studies require large energy deposition into a small target volume in a shorter time than the hydrodynamical time and need uniformity across the full thickness of the target. Since moderate energy ion beams ({approx} 0.3 MeV/u) can be useful tool for WDM physics, we propose WDM generation using Direct Plasma Injection Scheme (DPIS). In the DPIS, laser ion source is connected to the Radio Frequency Quadrupole (RFQ) linear accelerator directly without the beam transport line. DPIS with a realistic final focus and a linear accelerator can produce WDM.

  18. Swift Heavy Ions in Matter

    NASA Astrophysics Data System (ADS)

    Rothard, Hermann; Severin, Daniel; Trautmann, Christina

    2015-12-01

    The present volume contains the proceedings of the Ninth International Symposium on Swift Heavy Ions in Matter (SHIM). This conference was held in Darmstadt, from 18 to 21 May 2015. SHIM is a triennial series, which started about 25 years ago by a joint initiative of CIRIL - Caen and GSI - Darmstadt, with the aim of promoting fundamental and applied interdisciplinary research in the field of high-energy, heavy-ion interaction processes with matter. SHIM was successively organized in Caen (1989), Bensheim (1992), Caen (1995), Berlin (1998), Catania (2002), Aschaffenburg (2005), Lyon (2008), and Kyoto (2012). The conference attracts scientists from many different fields using high-energy heavy ions delivered by large accelerator facilities and characterized by strong and short electronic excitations.

  19. Secretly asymmetric dark matter

    NASA Astrophysics Data System (ADS)

    Agrawal, Prateek; Kilic, Can; Swaminathan, Sivaramakrishnan; Trendafilova, Cynthia

    2017-01-01

    We study a mechanism where the dark matter number density today arises from asymmetries generated in the dark sector in the early Universe, even though the total dark matter number remains zero throughout the history of the Universe. The dark matter population today can be completely symmetric, with annihilation rates above those expected from thermal weakly interacting massive particles. We give a simple example of this mechanism using a benchmark model of flavored dark matter. We discuss the experimental signatures of this setup, which arise mainly from the sector that annihilates the symmetric component of dark matter.

  20. Absorption of light dark matter in semiconductors

    NASA Astrophysics Data System (ADS)

    Hochberg, Yonit; Lin, Tongyan; Zurek, Kathryn M.

    2017-01-01

    Semiconductors are by now well-established targets for direct detection of MeV to GeV dark matter via scattering off electrons. We show that semiconductor targets can also detect significantly lighter dark matter via an absorption process. When the dark matter mass is above the band gap of the semiconductor (around an eV), absorption proceeds by excitation of an electron into the conduction band. Below the band gap, multiphonon excitations enable absorption of dark matter in the 0.01 eV to eV mass range. Energetic dark matter particles emitted from the sun can also be probed for masses below an eV. We derive the reach for absorption of a relic kinetically mixed dark photon or pseudoscalar in germanium and silicon, and show that existing direct detection results already probe new parameter space. With only a moderate exposure, low-threshold semiconductor target experiments can exceed current astrophysical and terrestrial constraints on sub-keV bosonic dark matter.

  1. The NSF Condensed Matter Physics Program

    NASA Astrophysics Data System (ADS)

    Sokol, Paul

    The Condensed Matter Physics (CMP) program in the NSF Division of Materials Research (DMR) supports experimental, as well as combined experiment and theory projects investigating the fundamental physics behind phenomena exhibited by condensed matter systems. CMP is the largest Individual Investigator Award program in DMR and supports a broad portfolio of research spanning both hard and soft condensed matter. Representative research areas include: 1) phenomena at the nano- to macro-scale including: transport, magnetic, and optical phenomena; classical and quantum phase transitions; localization; electronic, magnetic, and lattice structure or excitations; superconductivity; topological insulators; and nonlinear dynamics. 2) low-temperature physics: quantum fluids and solids; 1D & 2D electron systems. 3) soft condensed matter: partially ordered fluids, granular and colloid physics, liquid crystals, and 4) understanding the fundamental physics of new states of matter as well as the physical behavior of condensed matter under extreme conditions e.g., low temperatures, high pressures, and high magnetic fields. In this talk I will review the current CMP portfolio and discuss future funding trends for the program. I will also describe recent activities in the program aimed at addressing the challenges facing current and future principal investigators.

  2. 5 CFR 9401.109 - Disqualification of employees from particular matters involving creditors.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ... particular matters involving creditors. 9401.109 Section 9401.109 Administrative Personnel BUREAU OF CONSUMER... FINANCIAL PROTECTION § 9401.109 Disqualification of employees from particular matters involving creditors... employee shall not participate in a particular matter involving specific parties if the employee is...

  3. Basic Electronics II.

    ERIC Educational Resources Information Center

    Willison, Neal A.; Shelton, James K.

    Designed for use in basic electronics programs, this curriculum guide is comprised of 15 units of instruction. Unit titles are Review of the Nature of Matter and the P-N Junction, Rectifiers, Filters, Special Semiconductor Diodes, Bipolar-Junction Diodes, Bipolar Transistor Circuits, Transistor Amplifiers, Operational Amplifiers, Logic Devices,…

  4. How dark matter came to matter

    NASA Astrophysics Data System (ADS)

    de Swart, J. G.; Bertone, G.; van Dongen, J.

    2017-03-01

    The history of the dark matter problem can be traced back to at least the 1930s, but it was not until the early 1970s that the issue of 'missing matter' was widely recognized as problematic. In the latter period, previously separate issues involving missing mass were brought together in a single anomaly. We argue that reference to a straightforward accumulation of evidence alone is inadequate to comprehend this episode. Rather, the rise of cosmological research, the accompanying renewed interest in the theory of relativity and changes in the manpower division of astronomy in the 1960s are key to understanding how dark matter came to matter. At the same time, this story may also enlighten us on the methodological dimensions of past practices of physics and cosmology.

  5. The physics of strange matter

    SciTech Connect

    Olinto, A.V. |

    1991-12-01

    Strange matter may be the ground state of matter. We review the phenomenology and astrophysical implications of strange matter, and discuss the possible ways for testing the strange matter hypothesis.

  6. Big Questions: Dark Matter

    ScienceCinema

    Lincoln, Don

    2016-07-12

    Carl Sagan's oft-quoted statement that there are "billions and billions" of stars in the cosmos gives an idea of just how much "stuff" is in the universe. However scientists now think that in addition to the type of matter with which we are familiar, there is another kind of matter out there. This new kind of matter is called "dark matter" and there seems to be five times as much as ordinary matter. Dark matter interacts only with gravity, thus light simply zips right by it. Scientists are searching through their data, trying to prove that the dark matter idea is real. Fermilab's Dr. Don Lincoln tells us why we think this seemingly-crazy idea might not be so crazy after all.

  7. Magnetic Enhancements to Dark Matter Annihilation

    NASA Astrophysics Data System (ADS)

    Gardner, William G.; Tinsley, Todd

    2017-01-01

    The rate of dark matter annihilation should be greatest where the dark matter density is maximal. This is typically in the gravity wells of large stars where it also happens to be true that magnetic fields can be very large. In this poster we present an examination of how these intense magnetic fields can alter the cross section for dark matter annihilation into electron-positron pairs. We work within the framework of the minimally supersymmetric extension to the Standard Model (MSSM), and we choose its lightest neutralino as our dark matter candidate. Within this theory, dark matter can annihilate into many different final-state particles through several channels. We restrict our analysis to an electron-positron pair final state because of the low mass and reasonable detection signature. Since strong magnetic fields change how momentum is conserved for charged particles, this calculation investigates the relationship between the annihilation cross section and the electron's and positron's landau level. This is work is supported by NASA/Arkansas Space Grant Consortium and the Hendrix College Odyssey Program.

  8. Constraining Proton-Dark Matter Scattering Using Cosmic Ray Measurements

    NASA Astrophysics Data System (ADS)

    Cappiello, Christopher; Ng, Kenny; Beacom, John

    2017-01-01

    Dark matter scattering cross sections with protons and electrons are largely unconstrained below a dark matter mass of 1 GeV. By considering propagation of cosmic rays through a region with the dark matter density of the Milky Way, we demonstrate that if electrons and protons scatter with dark matter, this interaction adds an energy loss term to the cosmic ray propagation equation. This energy loss term distorts the calculated cosmic ray spectra from the observed spectra. By fitting the calculated spectra to data, we can set limits on the proton and electron scattering cross sections for dark matter. Chris Cappiello was supported by both The Ohio State University and the Ohio State University Department of Physics. Kenny Ng and John Beacom were supported by NSF Grant PHY-1404311 to John Beacom.

  9. Modeling Soft Matter

    NASA Astrophysics Data System (ADS)

    Kremer, Kurt

    Soft matter science or soft materials science is a relatively new term for the science of a huge class of rather different materials such as colloids, polymers (of synthetic or biological origin), membranes, complex molecular assemblies, complex fluids, etc. and combinations thereof. While many of these systems are contained in or are even the essential part of everyday products ("simple" plastics such as yoghurt cups, plastic bags, CDs, many car parts; gels and networks such as rubber, many low fat foods, "gummi" bears; colloidal systems such as milk, mayonnaise, paints, almost all cosmetics or body care products, the border lines between the different applications and systems are of course not sharp) or as biological molecules or assemblies (DNA, proteins, membranes and cytoskeleton, etc.) are central to our existence, others are basic ingredients of current and future high tech products (polymers with specific optical or electronic properties, conducting macromolecules, functional materials). Though the motivation is different in life science rather than in materials science biomolecular simulations, the basic structure of the problems faced in the two fields is very similar.

  10. When dark matter interacts with cosmic rays or interstellar matter: A morphological study

    NASA Astrophysics Data System (ADS)

    Carlson, Eric; Profumo, Stefano

    2015-09-01

    Excess emission over expected diffuse astrophysical backgrounds in the direction of the Galactic center region has been claimed at various wavelengths, from radio to gamma rays. Among particle models advocated to explain such observations, a few invoke interactions between dark matter particles and ordinary matter, such as cosmic rays, interstellar gas or free electrons. Depending on the specific interstellar matter particles' species and energy, such models predict distinct morphological features. In this study we make detailed, model-independent predictions for the morphology of models where the relevant electromagnetic emission is proportional to the product of the dark matter density profile and the density of interstellar matter or cosmic rays. We compare the predicted latitudinal and longitudinal distributions with observations, and provide the associated set of relevant spatial templates.

  11. Dark Matter Candidates: A Status Report

    SciTech Connect

    Bergstroem, Lars

    2010-06-23

    A brief review is given of various dark matter candidates. In particular, some of the most studied candidates like axions, inert Higgs doublet, sterile neutrinos, supersymmetric particles and Kaluza-Klein particles are discussed. In particular, indirect detection methods are reviewed, with gamma-ray detection being a particularly important method. The situation also for indirect detection through antimatter cosmic rays has recently become quite interesting with new results having dark matter as one of the possible explanations. Problems of this explanation and possible solutions are discussed, and the importance of new measurements is emphasized. If the explanation is indeed dark matter, some unusual and unexpected properties would be needed. One should always keep the possible 'conventional' astrophysical explanations, like electron and positron radiation from pulsars in mind. To get a conclusive case for dark matter, detection in other channels will likely be needed, such as direct detection or detection of angular and spectral signatures in gamma-rays.

  12. Condensed Matter Nuclear Science

    NASA Astrophysics Data System (ADS)

    Biberian, Jean-Paul

    2006-02-01

    1. General. A tribute to gene Mallove - the "Genie" reactor / K. Wallace and R. Stringham. An update of LENR for ICCF-11 (short course, 10/31/04) / E. Storms. New physical effects in metal deuterides / P. L. Hagelstein ... [et al.]. Reproducibility, controllability, and optimization of LENR experiments / D. J. Nagel -- 2. Experiments. Electrochemistry. Evidence of electromagnetic radiation from Ni-H systems / S. Focardi ... [et al.]. Superwave reality / I. Dardik. Excess heat in electrolysis experiments at energetics technologies / I. Dardik ... [et al.]. "Excess heat" during electrolysis in platinum/K[symbol]CO[symbol]/nickel light water system / J. Tian ... [et al.]. Innovative procedure for the, in situ, measurement of the resistive thermal coefficient of H(D)/Pd during electrolysis; cross-comparison of new elements detected in the Th-Hg-Pd-D(H) electrolytic cells / F. Celani ... [et al.]. Emergence of a high-temperature superconductivity in hydrogen cycled Pd compounds as an evidence for superstoihiometric H/D sites / A. Lipson ... [et al.]. Plasma electrolysis. Calorimetry of energy-efficient glow discharge - apparatus design and calibration / T. B. Benson and T. O. Passell. Generation of heat and products during plasma electrolysis / T. Mizuno ... [et al.]. Glow discharge. Excess heat production in Pd/D during periodic pulse discharge current in various conditions / A. B. Karabut. Beam experiments. Accelerator experiments and theoretical models for the electron screening effect in metallic environments / A. Huke, K. Czerski, and P. Heide. Evidence for a target-material dependence of the neutron-proton branching ratio in d+d reactions for deuteron energies below 20keV / A. Huke ... [et al.]. Experiments on condensed matter nuclear events in Kobe University / T. Minari ... [et al.]. Electron screening constraints for the cold fusion / K. Czerski, P. Heide, and A. Huke. Cavitation. Low mass 1.6 MHz sonofusion reactor / R. Stringham. Particle detection. Research

  13. Veterans Administration Databases

    Cancer.gov

    The Veterans Administration Information Resource Center provides database and informatics experts, customer service, expert advice, information products, and web technology to VA researchers and others.

  14. 76 FR 65212 - Henkel Corporation, Currently Known as Henkel Electronic Materials, LLC, Electronic Adhesives...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-10-20

    ... Employment and Training Administration Henkel Corporation, Currently Known as Henkel Electronic Materials..., Massachusetts location to combine the legacy Henkel Electronic Materials business and The National Starch Electronic Materials business following a company purchase in April 2008. Workers separated from...

  15. Intense e-beam interaction with matter

    SciTech Connect

    Ritchie, R.H.; Crawford, O.H.

    1984-01-01

    This document describes work done in this period on certain nonlinear processes of potential importance at high energy densities in condensed matter, and on the theory of the electron slowing-down-cascade spectrum engendered in solids by e-beams.

  16. The Light Dark Matter eXperiment

    NASA Astrophysics Data System (ADS)

    Colegrove, Owen; LDMX Collaboration

    2017-01-01

    The Light Dark Matter eXperiment (LDMX) proposes a high-statistics search for low-mass dark matter at a new experimental facility, Dark Sector Experiments at LCLS-II (DASEL), at SLAC. LDMX employs the missing momentum technique, where electrons scattering in a thin target can produce dark matter via ``dark bremsstrahlung'' that are not observed in the detector. To identify these rare signal events, LDMX individually tags incoming beam-energy electrons, unambiguously associates them with low energy, moderate transverse-momentum recoils of the incoming electron, and establishes the absence of any additional forward-recoiling charged particles or neutral hadrons. LDMX will employ low mass tracking to tag incoming beam-energy electrons with high purity and cleanly reconstruct recoils. A high-speed, granular calorimeter with MIP sensitivity is used to reject the high rate of bremsstrahlung background at trigger level while working in tandem with a hadronic calorimeter to veto rare photo nuclear reactions. Ultimately, LDMX aims to probe thermal dark matter over most of the viable sub-GeV mass range to a decisive level of sensitivity. This talk will summarize the current status of the LDMX design and performance studies and progress in developing the DASEL beamline.

  17. Nonadiabatic three-neutrino oscillations in matter

    SciTech Connect

    DOlivo, J.C.; Oteo, J.A.

    1996-07-01

    Oscillations of three neutrinos in matter are analyzed by using the Magnus expansion for the time-evolution operator. We derive a simple expression for the electron-neutrino survival probability which is applied to the examination of the effect of a third neutrino on the nonadiabatic flavor transformations. {copyright} {ital 1996 The American Physical Society.}

  18. Subcutaneous Interferon β-1a Administration by Electronic Auto-injector is Associated with High Adherence in Patients with Relapsing Remitting Multiple Sclerosis in a Real-life Study

    PubMed Central

    Järvinen, Elina; Multanen, Juha; Atula, Sari

    2017-01-01

    The objective was to investigate adherence measured by an electronic auto-injector device, and self-reported adherence and treatment convenience in subjects with relapsing remitting multiple sclerosis (RRMS), using an electronic auto-injector Rebismart® to self-inject interferon β-1a. Thirty one patients with RRMS using the electronic auto-injector Rebismart® for self-injecting interferon β-1a subcutaneously three times weekly were included in a real-life clinical multicenter study for 24 weeks in Finland. Mean adherence reported by the device and mean self-assessment of adherence were studied. Reasons for missing injections and treatment convenience were assessed. Association between adherence and gender and age were studied. The mean adherence calculated from the device data was 93.5%. The mean self-assessment of adherence was 96.6%. The most common reason for missing an injection was forget-fulness. Adherence (measured by the device) was not changed over time. In the high adherence group there were more females and young patients (<30 years of age). The auto-injector was found to substantially ease the treatment by 90% of the patients. The electronic auto-injector was associated with high adherence to treatment. The device was found to ease the patient’s treatment and it was perceived as easy to use. It is a convenient tool to assess patient’s adherence to treatment. PMID:28286627

  19. Subcutaneous Interferon β-1a Administration by Electronic Auto-injector is Associated with High Adherence in Patients with Relapsing Remitting Multiple Sclerosis in a Real-life Study.

    PubMed

    Järvinen, Elina; Multanen, Juha; Atula, Sari

    2017-02-20

    The objective was to investigate adherence measured by an electronic auto-injector device, and self-reported adherence and treatment convenience in subjects with relapsing remitting multiple sclerosis (RRMS), using an electronic auto-injector Rebismart(®) to self-inject interferon β-1a. Thirty one patients with RRMS using the electronic auto-injector Rebismart(®) for self-injecting interferon β-1a subcutaneously three times weekly were included in a real-life clinical multicenter study for 24 weeks in Finland. Mean adherence reported by the device and mean self-assessment of adherence were studied. Reasons for missing injections and treatment convenience were assessed. Association between adherence and gender and age were studied. The mean adherence calculated from the device data was 93.5%. The mean self-assessment of adherence was 96.6%. The most common reason for missing an injection was forget-fulness. Adherence (measured by the device) was not changed over time. In the high adherence group there were more females and young patients (<30 years of age). The auto-injector was found to substantially ease the treatment by 90% of the patients. The electronic auto-injector was associated with high adherence to treatment. The device was found to ease the patient's treatment and it was perceived as easy to use. It is a convenient tool to assess patient's adherence to treatment.

  20. Constraining decaying dark matter with Fermi LAT gamma-rays

    SciTech Connect

    Zhang, Le; Sigl, Günter; Weniger, Christoph; Maccione, Luca; Redondo, Javier E-mail: christoph.weniger@desy.de E-mail: redondo@mppmm.mpg.de

    2010-06-01

    High energy electrons and positrons from decaying dark matter can produce a significant flux of gamma rays by inverse Compton off low energy photons in the interstellar radiation field. This possibility is inevitably related with the dark matter interpretation of the observed PAMELA and FERMI excesses. The aim of this paper is providing a simple and universal method to constrain dark matter models which produce electrons and positrons in their decay by using the Fermi LAT gamma-ray observations in the energy range between 0.5 GeV and 300 GeV. We provide a set of universal response functions that, once convolved with a specific dark matter model produce the desired constraints. Our response functions contain all the astrophysical inputs such as the electron propagation in the galaxy, the dark matter profile, the gamma-ray fluxes of known origin, and the Fermi LAT data. We study the uncertainties in the determination of the response functions and apply them to place constraints on some specific dark matter decay models that can well fit the positron and electron fluxes observed by PAMELA and Fermi LAT. To this end we also take into account prompt radiation from the dark matter decay. We find that with the available data decaying dark matter cannot be excluded as source of the PAMELA positron excess.

  1. EDITORIAL: Focus on Dark Matter and Particle Physics

    NASA Astrophysics Data System (ADS)

    Aprile, Elena; Profumo, Stefano

    2009-10-01

    The quest for the nature of dark matter has reached a historical point in time, with several different and complementary experiments on the verge of conclusively exploring large portions of the parameter space of the most theoretically compelling particle dark matter models. This focus issue on dark matter and particle physics brings together a broad selection of invited articles from the leading experimental and theoretical groups in the field. The leitmotif of the collection is the need for a multi-faceted search strategy that includes complementary experimental and theoretical techniques with the common goal of a sound understanding of the fundamental particle physical nature of dark matter. These include theoretical modelling, high-energy colliders and direct and indirect searches. We are confident that the works collected here present the state of the art of this rapidly changing field and will be of interest to both experts in the topic of dark matter as well as to those new to this exciting field. Focus on Dark Matter and Particle Physics Contents DARK MATTER AND ASTROPHYSICS Scintillator-based detectors for dark matter searches I S K Kim, H J Kim and Y D Kim Cosmology: small-scale issues Joel R Primack Big Bang nucleosynthesis and particle dark matter Karsten Jedamzik and Maxim Pospelov Particle models and the small-scale structure of dark matter Torsten Bringmann DARK MATTER AND COLLIDERS Dark matter in the MSSM R C Cotta, J S Gainer, J L Hewett and T G Rizzo The role of an e+e- linear collider in the study of cosmic dark matter M Battaglia Collider, direct and indirect detection of supersymmetric dark matter Howard Baer, Eun-Kyung Park and Xerxes Tata INDIRECT PARTICLE DARK MATTER SEARCHES:EXPERIMENTS PAMELA and indirect dark matter searches M Boezio et al An indirect search for dark matter using antideuterons: the GAPS experiment C J Hailey Perspectives for indirect dark matter search with AMS-2 using cosmic-ray electrons and positrons B Beischer, P von

  2. Teachers Matter. Yes. Schools Matter. Yes. Districts Matter--Really?

    ERIC Educational Resources Information Center

    Chenoweth, Karin

    2015-01-01

    School districts shape the conditions in which schools operate and as such can support or undermine school success and thus student success. All of which is to say that school districts matter. This article looks at the success of two districts whose low-income and minority students beat the odds in academic achievement. Lessons from these…

  3. 28 CFR 8.3 - Designation of the investigative bureau having administrative forfeiture authority; claims for...

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 28 Judicial Administration 1 2010-07-01 2010-07-01 false Designation of the investigative bureau having administrative forfeiture authority; claims for awards, offers in compromise and matters relating to bonds. 8.3 Section 8.3 Judicial Administration DEPARTMENT OF JUSTICE FBI FORFEITURE AUTHORITY...

  4. 41 CFR 60-30.14 - Designation of Administrative Law Judges.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... Administrative Law Judges. 60-30.14 Section 60-30.14 Public Contracts and Property Management Other Provisions... EXECUTIVE ORDER 11246 Hearings and Related Matters § 60-30.14 Designation of Administrative Law Judges. Hearings shall be held before an Administrative Law Judge of the Department of Labor who shall...

  5. 28 CFR 8.3 - Designation of the investigative bureau having administrative forfeiture authority; claims for...

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... 28 Judicial Administration 1 2011-07-01 2011-07-01 false Designation of the investigative bureau having administrative forfeiture authority; claims for awards, offers in compromise and matters relating to bonds. 8.3 Section 8.3 Judicial Administration DEPARTMENT OF JUSTICE FBI FORFEITURE AUTHORITY...

  6. 28 CFR 8.3 - Designation of the investigative bureau having administrative forfeiture authority; claims for...

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... 28 Judicial Administration 1 2012-07-01 2012-07-01 false Designation of the investigative bureau having administrative forfeiture authority; claims for awards, offers in compromise and matters relating to bonds. 8.3 Section 8.3 Judicial Administration DEPARTMENT OF JUSTICE FBI FORFEITURE AUTHORITY...

  7. Complex Dark Matter

    ScienceCinema

    Lincoln, Don

    2016-07-12

    After a century of study, scientists have come to the realization that the ordinary matter made of atoms is a minority in the universe. In order to explain observations, it appears that there exists a new and undiscovered kind of matter, called dark matter, that is five times more prevalent than ordinary matter. The evidence for this new matter’s existence is very strong, but scientists know only a little about its nature. In today’s video, Fermilab’s Dr. Don Lincoln talks about an exciting and unconventional idea, specifically that dark matter might have a very complex set of structures and interactions. While this idea is entirely speculative, it is an interesting hypothesis and one that scientists are investigating.

  8. Codecaying Dark Matter.

    PubMed

    Dror, Jeff Asaf; Kuflik, Eric; Ng, Wee Hao

    2016-11-18

    We propose a new mechanism for thermal dark matter freeze-out, called codecaying dark matter. Multicomponent dark sectors with degenerate particles and out-of-equilibrium decays can codecay to obtain the observed relic density. The dark matter density is exponentially depleted through the decay of nearly degenerate particles rather than from Boltzmann suppression. The relic abundance is set by the dark matter annihilation cross section, which is predicted to be boosted, and the decay rate of the dark sector particles. The mechanism is viable in a broad range of dark matter parameter space, with a robust prediction of an enhanced indirect detection signal. Finally, we present a simple model that realizes codecaying dark matter.

  9. Neutrinos and dark matter

    SciTech Connect

    Ibarra, Alejandro

    2015-07-15

    Neutrinos could be key particles to unravel the nature of the dark matter of the Universe. On the one hand, sterile neutrinos in minimal extensions of the Standard Model are excellent dark matter candidates, producing potentially observable signals in the form of a line in the X-ray sky. On the other hand, the annihilation or the decay of dark matter particles produces, in many plausible dark matter scenarios, a neutrino flux that could be detected at neutrino telescopes, thus providing non-gravitational evidence for dark matter. More conservatively, the non-observation of a significant excess in the neutrino fluxes with respect to the expected astrophysical backgrounds can be used to constrain dark matter properties, such as the self-annihilation cross section, the scattering cross section with nucleons and the lifetime.

  10. Ghost dark matter

    SciTech Connect

    Furukawa, Tomonori; Yokoyama, Shuichiro; Ichiki, Kiyotomo; Sugiyama, Naoshi; Mukohyama, Shinji E-mail: shu@a.phys.nagoya-u.ac.jp E-mail: naoshi@a.phys.nagoya-u.ac.jp

    2010-05-01

    We revisit ghost dark matter, the possibility that ghost condensation may serve as an alternative to dark matter. In particular, we investigate the Friedmann-Robertson-Walker (FRW) background evolution and the large-scale structure (LSS) in the ΛGDM universe, i.e. a late-time universe dominated by a cosmological constant and ghost dark matter. The FRW background of the ΛGDM universe is indistinguishable from that of the standard ΛCDM universe if M∼>1eV, where M is the scale of spontaneous Lorentz breaking. From the LSS we find a stronger bound: M∼>10eV. For smaller M, ghost dark matter would have non-negligible sound speed after the matter-radiation equality, and thus the matter power spectrum would significantly differ from observation. These bounds are compatible with the phenomenological upper bound M∼<100GeV known in the literature.

  11. Migrant Education Administrative Guide.

    ERIC Educational Resources Information Center

    North Carolina State Dept. of Public Instruction, Raleigh. Div. of Compensatory Education.

    Relating specifically to the North Carolina migrant education program's administrative responsibilities, this guide is designed to aid administrators in program management, monitoring project activities, project evaluation, self-assessment, determining needs for training and staff development, site-visit preparation, policy development, and…

  12. Champions of Children. Administrators . . .

    ERIC Educational Resources Information Center

    Chaffee, John; Olds, H. Robert

    Today, in an era of taxpayer revolts, lack of clarity in values, and changing family structure, children need advocates in the political arena as well as in the schools. This pamphlet suggests that administrators are in an excellent position to defend the rights of children on all fronts. It focuses on what administrators have done and specific…

  13. The Administrative Power Grab

    ERIC Educational Resources Information Center

    Sorenson, Richard D.

    2007-01-01

    Administrative power for some school teachers can be an aphrodisiac that can be applied negatively, especially when a leader has devastating instinct for the weaknesses of others. A leader's intellect and heart closes shop and ceases to function when drunk on power. In this article, the author describes how the use of administrative power can be…

  14. Traditionalism and Educational Administration.

    ERIC Educational Resources Information Center

    Holmes, Mark

    Administration is defined as the enactment of moral choices influencing subordinates within an organizational setting. It is distinguished from management, which is considered to involve a lower level of discretion. Educational administration is therefore in the moral domain; it involves discretionary, moral choices in a field that is itself moral…

  15. Test Administration Models

    ERIC Educational Resources Information Center

    Becker, Kirk A.; Bergstrom, Betty A.

    2013-01-01

    The need for increased exam security, improved test formats, more flexible scheduling, better measurement, and more efficient administrative processes has caused testing agencies to consider converting the administration of their exams from paper-and-pencil to computer-based testing (CBT). Many decisions must be made in order to provide an optimal…

  16. The Administrative Team.

    ERIC Educational Resources Information Center

    Ohio Association of Elementary School Principals, Westerville.

    Although needs of school districts vary with size, degree of teacher negotiation procedures, and type of community involvement, the administrative team model is presented as an effective, appropriate administrative organization. Based on an assumption that each level of authority in a school district possesses and exercises expertise and unique…

  17. Administrative Theory in Transition.

    ERIC Educational Resources Information Center

    Griffiths, Daniel E.

    This monograph analyzes transition in educational administrative theory. A brief introductory section describes the theoretical movement, the substance and repercussions of Thomas Greenfield's critique of educational administrative theory in 1974, and emerging qualitative approaches. Seven readings, all written by the volume's author, view…

  18. Improving Educational Administrative Decisions.

    ERIC Educational Resources Information Center

    Wolfe, A. E.

    This paper discusses the financial crisis facing public education in the United States today and argues that the most effective response to this crisis is to improve the decision-making skills of educational administrators. Based on a review of the literature on administrative decision-making and organizational change, the author examines several…

  19. Rural Administrative Leadership Handbook.

    ERIC Educational Resources Information Center

    Tift, Carolyn

    This resource book on rural administrative leadership is the result of 1988 interviews with school administrators involved in successful rural educational programs. The material is divided into eight chapters, each self-contained for separate use. Chapter 1, "Getting to Know the Community," addresses qualities of living and working in…

  20. 76 FR 65710 - Decision and Order Amending Waivers Granted to Mitsubishi Electric & Electronics USA, Inc. From...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-10-24

    ... Electric & Electronics USA, Inc. From the Department of Energy Commercial Package Air Conditioner and Heat... Matter of: Mitsubishi Electric & Electronics USA, Inc. (Mitsubishi) (Case No. CAC-037). Background...

  1. Clumpy cold dark matter

    NASA Technical Reports Server (NTRS)

    Silk, Joseph; Stebbins, Albert

    1993-01-01

    A study is conducted of cold dark matter (CDM) models in which clumpiness will inhere, using cosmic strings and textures suited to galaxy formation. CDM clumps of 10 million solar mass/cu pc density are generated at about z(eq) redshift, with a sizable fraction surviving. Observable implications encompass dark matter cores in globular clusters and in galactic nuclei. Results from terrestrial dark matter detection experiments may be affected by clumpiness in the Galactic halo.

  2. Dark Matter 2013

    NASA Astrophysics Data System (ADS)

    Schumann, Marc

    2014-10-01

    This article reviews the status of the exciting and fastly evolving field of dark matter research as of summer 2013, when it was discussed at the International Cosmic Ray Conference (ICRC) 2013 in Rio de Janeiro. It focuses on the three main avenues to detect weakly interacting massive particle (WIMP) dark matter: direct detection, indirect detection, and collider searches. The article is based on the dark matter rapporteur talk summarizing the presentations given at the conference, filling some gaps for completeness.

  3. Correlated Electrons in Reduced Dimensions

    SciTech Connect

    Bonesteel, Nicholas E

    2015-01-31

    This report summarizes the work accomplished under the support of US DOE grant # DE-FG02-97ER45639, "Correlated Electrons in Reduced Dimensions." The underlying hypothesis of the research supported by this grant has been that studying the unique behavior of correlated electrons in reduced dimensions can lead to new ways of understanding how matter can order and how it can potentially be used. The systems under study have included i) fractional quantum Hall matter, which is realized when electrons are confined to two-dimensions and placed in a strong magnetic field at low temperature, ii) one-dimensional chains of spins and exotic quasiparticle excitations of topologically ordered matter, and iii) electrons confined in effectively ``zero-dimensional" semiconductor quantum dots.

  4. The Dark Matter Problem

    NASA Astrophysics Data System (ADS)

    Sanders, Robert H.

    2014-02-01

    1. Introduction; 2. Early history of the dark matter hypothesis; 3. The stability of disk galaxies: the dark halo solutions; 4. Direct evidence: extended rotation curves of spiral galaxies; 5. The maximum disk: light traces mass; 6. Cosmology and the birth of astroparticle physics; 7. Clusters revisited: missing mass found; 8. CDM confronts galaxy rotation curves; 9. The new cosmology: dark matter is not enough; 10. An alternative to dark matter: Modified Newtonian Dynamics; 11. Seeing dark matter: the theory and practice of detection; 12. Reflections: a personal point of view; Appendix; References; Index.

  5. A Matter of Quantum Voltages

    SciTech Connect

    Sellner, Bernhard; Kathmann, Shawn M.

    2014-11-14

    Voltages inside matter are relevant to crystallization, materials science, biology, catalysis, and aqueous chemistry. Electron holography is able to measure the variation of voltages in matter and modern supercomputers allow the calculation of quantum voltages with practically unlimited spatial and temporal resolution of bulk systems. Of particular interest is the Mean Inner Potential (Vo) - the spatial average of these voltages. Voltages are very sensitive to the distribution of electrons and provide metrics to understand interactions in condensed phases. In the present study, we find excellent agreement with measurements of Vo for vitrified water and salt crystals and demonstrate the impact of covalent and ionic bonding as well as intermolecular/atomic interactions. Furthermore, we predict Vo as well as the fluctuations of these voltages in aqueous NaCl electrolytes and characterize the changes in their behavior as the resolution increases below the size of atoms. This work was supported by the U.S. Department of Energy, Office of Basic Energy Sciences, Division of Chemical Sciences, Geosciences & Biosciences. Pacific Northwest National Laboratory (PNNL) is a multiprogram national laboratory operated for DOE by Battelle. This research used resources of the National Energy Research Scientific Computing Center, which is supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231.

  6. Modelling Positron Interactions with Matter

    NASA Astrophysics Data System (ADS)

    Garcia, G.; Petrovic, Z.; White, R.; Buckman, S.

    2011-05-01

    In this work we link fundamental measurements of positron interactions with biomolecules, with the development of computer codes for positron transport and track structure calculations. We model positron transport in a medium from a knowledge of the fundamental scattering cross section for the atoms and molecules comprising the medium, combined with a transport analysis based on statistical mechanics and Monte-Carlo techniques. The accurate knowledge of the scattering is most important at low energies, a few tens of electron volts or less. The ultimate goal of this work is to do this in soft condensed matter, with a view to ultimately developing a dosimetry model for Positron Emission Tomography (PET). The high-energy positrons first emitted by a radionuclide in PET may well be described by standard formulas for energy loss of charged particles in matter, but it is incorrect to extrapolate these formulas to low energies. Likewise, using electron cross-sections to model positron transport at these low energies has been shown to be in serious error due to the effects of positronium formation. Work was supported by the Australian Research Council, the Serbian Government, and the Ministerio de Ciencia e Innovación, Spain.

  7. 45 CFR 164.308 - Administrative safeguards.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... business processes for protection of the security of electronic protected health information while... Information § 164.308 Administrative safeguards. (a) A covered entity or business associate must, in accordance with § 164.306: (1)(i) Standard: Security management process. Implement policies and procedures...

  8. 45 CFR 164.308 - Administrative safeguards.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... business processes for protection of the security of electronic protected health information while... Information § 164.308 Administrative safeguards. (a) A covered entity or business associate must, in accordance with § 164.306: (1)(i) Standard: Security management process. Implement policies and procedures...

  9. 39 CFR 3002.11 - Administrative Office.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... administration in conjunction with the Personnel Officer of a personnel program designed to meet the needs of the... electronic reading room accessible on the Commission's website at www.prc.gov. The information available on the Commission's website is, in general, coextensive with that available from the Commission's...

  10. PARTICULATE MATTER NAAQS RISK AND EXPOSURE ...

    EPA Pesticide Factsheets

    The PM REA assesses human exposure and health risks for particulate matter. To provide a quantitative assessment of PM exposures and health risks as one of the key information inputs to the Administrator in order to make an informed decision regarding the PM NAAQS. A tiered risk/exposure assessment will be conducted as part of the PM NAAQS review and will be peer reviewed by the Clean Air Scientific Advisory Committee (CASAC) of EPA’s Science Advisory Board.

  11. Language (Policy) Matters!

    ERIC Educational Resources Information Center

    Kozleski, E. B.; Mulligan, E.; Hernandez-Saca, D.

    2011-01-01

    Public education has a vital role in ensuring that this and subsequent generations are successful in a global, multilingual economy. In this What Matters brief, we examine how teachers, students, parents, and communities in our nation's schools can create rich opportunities for students to learn. Language (Policy) Matters! includes information and…

  12. Condensate dark matter stars

    SciTech Connect

    Li, X.Y.; Harko, T.; Cheng, K.S. E-mail: harko@hkucc.hku.hk

    2012-06-01

    We investigate the structure and stability properties of compact astrophysical objects that may be formed from the Bose-Einstein condensation of dark matter. Once the critical temperature of a boson gas is less than the critical temperature, a Bose-Einstein Condensation process can always take place during the cosmic history of the universe. Therefore we model the dark matter inside the star as a Bose-Einstein condensate. In the condensate dark matter star model, the dark matter equation of state can be described by a polytropic equation of state, with polytropic index equal to one. We derive the basic general relativistic equations describing the equilibrium structure of the condensate dark matter star with spherically symmetric static geometry. The structure equations of the condensate dark matter stars are studied numerically. The critical mass and radius of the dark matter star are given by M{sub crit} ≈ 2(l{sub a}/1fm){sup 1/2}(m{sub χ}/1 GeV){sup −3/2}M{sub s}un and R{sub crit} ≈ 1.1 × 10{sup 6}(l{sub a}/1 fm){sup 1/2}(m{sub χ}/1 GeV){sup −3/2} cm respectively, where l{sub a} and m{sub χ} are the scattering length and the mass of dark matter particle, respectively.

  13. Dark matter and cosmology

    SciTech Connect

    Schramm, D.N.

    1992-03-01

    The cosmological dark matter problem is reviewed. The Big Bang Nucleosynthesis constraints on the baryon density are compared with the densities implied by visible matter, dark halos, dynamics of clusters, gravitational lenses, large-scale velocity flows, and the {Omega} = 1 flatness/inflation argument. It is shown that (1) the majority of baryons are dark; and (2) non-baryonic dark matter is probably required on large scales. It is also noted that halo dark matter could be either baryonic or non-baryonic. Descrimination between cold'' and hot'' non-baryonic candidates is shown to depend on the assumed seeds'' that stimulate structure formation. Gaussian density fluctuations, such as those induced by quantum fluctuations, favor cold dark matter, whereas topological defects such as strings, textures or domain walls may work equally or better with hot dark matter. A possible connection between cold dark matter, globular cluster ages and the Hubble constant is mentioned. Recent large-scale structure measurements, coupled with microwave anisotropy limits, are shown to raise some questions for the previously favored density fluctuation picture. Accelerator and underground limits on dark matter candidates are also reviewed.

  14. Dark matter and cosmology

    SciTech Connect

    Schramm, D.N.

    1992-03-01

    The cosmological dark matter problem is reviewed. The Big Bang Nucleosynthesis constraints on the baryon density are compared with the densities implied by visible matter, dark halos, dynamics of clusters, gravitational lenses, large-scale velocity flows, and the {Omega} = 1 flatness/inflation argument. It is shown that (1) the majority of baryons are dark; and (2) non-baryonic dark matter is probably required on large scales. It is also noted that halo dark matter could be either baryonic or non-baryonic. Descrimination between ``cold`` and ``hot`` non-baryonic candidates is shown to depend on the assumed ``seeds`` that stimulate structure formation. Gaussian density fluctuations, such as those induced by quantum fluctuations, favor cold dark matter, whereas topological defects such as strings, textures or domain walls may work equally or better with hot dark matter. A possible connection between cold dark matter, globular cluster ages and the Hubble constant is mentioned. Recent large-scale structure measurements, coupled with microwave anisotropy limits, are shown to raise some questions for the previously favored density fluctuation picture. Accelerator and underground limits on dark matter candidates are also reviewed.

  15. Matter in transition

    SciTech Connect

    Anderson, Lara B.; Gray, James; Raghuram, Nikhil; Taylor, Washington

    2016-04-13

    In this study, we explore a novel type of transition in certain 6D and 4D quantum field theories, in which the matter content of the theory changes while the gauge group and other parts of the spectrum remain invariant. Such transitions can occur, for example, for SU(6) and SU(7) gauge groups, where matter fields in a three-index antisymmetric representation and the fundamental representation are exchanged in the transition for matter in the two-index antisymmetric representation. These matter transitions are realized by passing through superconformal theories at the transition point. We explore these transitions in dual F-theory and heterotic descriptions, where a number of novel features arise. For example, in the heterotic description the relevant 6D SU(7) theories are described by bundles on K3 surfaces where the geometry of the K3 is constrained in addition to the bundle structure. On the F-theory side, non-standard representations such as the three-index antisymmetric representation of SU(N) require Weierstrass models that cannot be realized from the standard SU(N) Tate form. We also briefly describe some other situations, with groups such as Sp(3), SO(12), and SU(3), where analogous matter transitions can occur between different representations. For SU(3), in particular, we find a matter transition between adjoint matter and matter in the symmetric representation, giving an explicit Weierstrass model for the F-theory description of the symmetric representation that complements another recent analogous construction.

  16. Foreign matter identification from solid dosage forms.

    PubMed

    Pajander, Jari; Haugshøj, Kenneth Brian; Bjørneboe, Kathrine; Wahlberg, Pia; Rantanen, Jukka

    2013-06-01

    Despite the increased request for robust quality systems, the end product may contain unidentified defects or discoloured regions. The foreign matter has to be monitored, identified and its source defined in order to prevent further contamination. However, the identification task can be complicated, since the origin and nature of foreign matter are various. The aim of this study is to provide an efficient foreign matter identification procedure for various substances possibly originating from pharmaceutical manufacturing environment. The surface or cross-section of the uncoated and coated tablets was analysed by utilization of different analytical techniques, such as light microscopy (LM), scanning electron microscopy in combination with energy dispersive X-ray microanalysis (SEM/EDX), Fourier transform infrared spectroscopy (FT-IR) and time-of-flight secondary ion mass spectrometry (ToF-SIMS). The results indicate that the combination of different analytical techniques proved to be a powerful approach in foreign matter identification. Light microscopy and SEM generate information on the morphology of foreign matter particles. EDX provides elemental analysis, which most often serves as final confirmation of the identification. However, FT-IR can be used to obtain information on the compounds chemical structure and conformation, and ToF-SIMS provides sensitivity in cases, where the entire solid dosage form is contaminated with foreign matter.

  17. Dark Forces and Light Dark Matter

    SciTech Connect

    Hooper, Dan; Weiner, Neal; Xue, Wei

    2012-09-01

    We consider a simple class of models in which the dark matter, X, is coupled to a new gauge boson, phi, with a relatively low mass (m_phi \\sim 100 MeV-3 GeV). Neither the dark matter nor the new gauge boson have tree-level couplings to the Standard Model. The dark matter in this model annihilates to phi pairs, and for a coupling of g_X \\sim 0.06 (m_X/10 GeV)^1/2 yields a thermal relic abundance consistent with the cosmological density of dark matter. The phi's produced in such annihilations decay through a small degree of kinetic mixing with the photon to combinations of Standard Model leptons and mesons. For dark matter with a mass of \\sim10 GeV, the shape of the resulting gamma-ray spectrum provides a good fit to that observed from the Galactic Center, and can also provide the very hard electron spectrum required to account for the observed synchrotron emission from the Milky Way's radio filaments. For kinetic mixing near the level naively expected from loop-suppressed operators (epsilon \\sim 10^{-4}), the dark matter is predicted to scatter elastically with protons with a cross section consistent with that required to accommodate the signals reported by DAMA/LIBRA, CoGeNT and CRESST-II.

  18. Drug Education for Administrators

    ERIC Educational Resources Information Center

    Hackett, Peter; McKeon, Thomas L.

    1976-01-01

    The formulation of a drug policy and the implementation of that policy in a firm but fair manner are the responsibility of the school administrator. Authors give serious consideration to this responsibility. (Editor/RK)

  19. Food and Drug Administration

    MedlinePlus

    ... blog post. April 11, 2017 ‘Organs-on-Chips’ Technology: FDA Testing Groundbreaking Science More FDA Voice Blog ... FEAR Act Site Map Nondiscrimination Website Policies U.S. Food and Drug Administration 10903 New Hampshire Avenue Silver ...

  20. Administrative Law Judges

    EPA Pesticide Factsheets

    The Administrative Law Judges conduct hearings and render decisions in proceedings between the EPA and persons, businesses, government entities, and other organizations which are or are alleged to be regulated under environmental laws.