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1

Core-level photoemission spectrum for the spin-degenerate Anderson model  

Microsoft Academic Search

The core-level photoemission for the spin-degenerate single-impurity Anderson model is calculated taking into account the electrostatic interaction of the core hole with the conduction electrons. This interaction changes the spectrum qualitatively and reduces the hybridization between the valence level and the conduction band.

J. J. S. Brito; H. O. Frota

1990-01-01

2

The Anderson Quin Cycle  

Microsoft Academic Search

The objective of this study was to make a more refined evaluation of the Anderson Quin Cycle based on most recent information on the performance of various elements that will be used in the Anderson Quin Cycle. My original estimate of the work plan for evaluating and optimizing the Anderson Quin Cycle called for 7000 man hours of work. Since

J. H. Anderson; W. M. Bilbow

1993-01-01

3

Quantifying Anderson's fault types  

Microsoft Academic Search

Anderson [1905] explained three basic types of faulting (normal, strike-slip, and reverse) in terms of the shape of the causative stress tensor and its orientation relative to the Earth's surface. Quantitative parameters can be defined which contain information about both shape and orientation [Célérier, 1995], thereby offering a way to distinguish fault-type domains on plots of regional stress fields and

Robert W. Simpson

1997-01-01

4

Screened Anderson model  

Microsoft Academic Search

The occupation number ({ital n}{sub {ital f}}) of the impurity orbital ({ital f}) in the Anderson model is calculated as a function of the orbital energy ({var epsilon}{sub {ital f}}), taking into account finite values for the Coulomb interactions between the impurity and the conduction electrons ({ital G}) and between two electrons inside of the localized orbital ({ital U}). For

H. O. Frota; G. D. Mahan

1991-01-01

5

The Anderson Quin Cycle  

SciTech Connect

The objective of this study was to make a more refined evaluation of the Anderson Quin Cycle based on most recent information on the performance of various elements that will be used in the Anderson Quin Cycle. My original estimate of the work plan for evaluating and optimizing the Anderson Quin Cycle called for 7000 man hours of work. Since this grant was limited to 2150 man hours, we could not expect to achieve all the objectives within the allotted period of work. However, the most relevant program objectives have been completed as reported here. The analysis generally confirms the results originally estimated in my paper on the subject. (Ref. 2) Further optimizations should show even higher efficiencies. The Anderson Quin Cycle (US Patent applied for) basically consists of 5 elements in the power cycle: A refrigeration system to cool and clean the inlet air before it enters the compressor that supplies air for the gas turbine; a gas turbine consisting of a compressor, combustor, and turbine; a steam boiler and steam turbine system using the heat from the exhaust gas out of the gas turbine; a vapor turbine cycle, which utilizes the condensed heat from the exhaust of the steam turbine and the exhaust gas heat leaving the steam boiler to operate a vapor turbine cycle which utilizes another fluid than water, in this case isobutane; and the fifth element consists of a gas cooler and heat pump system, which removes the heat from the exhaust gas to lower its temperature essentially to atmospheric temperature, and at the same time permits treatment of the exhaust gas to remove acid components such as sulfur dioxide and nitrogen oxides. Current industry accepted component characteristics were incorporated in the performance analysis of the overall cycle, ensuring accurate and meaningful operating predictions. The characteristics and performance of each of the elements are described. The thermal efficiency of the optimized calculated Anderson Quin Cycle is 62 percent.

Anderson, J.H.; Bilbow, W.M.

1993-03-18

6

Anderson localized optical fibers  

NASA Astrophysics Data System (ADS)

Anderson localization has been a subject of fascination and intense research for more than fifty years. It is highly desirable to harness its curious and interesting properties in practical applications. We have taken a step in this direction by using this phenomenon as the wave guiding mechanism in optical fibers. We have shown, both experimentally and numerically, that for a moderate amount of disorder in optical fibers, transverse localization results in an effective propagating beam diameter that is comparable to that of a typical index-guiding optical fiber.1, 2 In this work, we investigate the effect of macro-bending on the localization properties in a disordered polymer optical fiber both experimentally and numerically. We show that macro-bending in ranges of practical interest does not significantly affect the beam propagation in Anderson localized fibers as long as the strong localization dominates the effect of bending.

Karbasi, Salman; Koch, Karl W.; Mafi, Arash

2013-02-01

7

Topological Anderson insulator.  

PubMed

Disorder plays an important role in two dimensions, and is responsible for striking phenomena such as metal-insulator transition and the integral and fractional quantum Hall effects. In this Letter, we investigate the role of disorder in the context of the recently discovered topological insulator, which possesses a pair of helical edge states with opposing spins moving in opposite directions and exhibits the phenomenon of quantum spin Hall effect. We predict an unexpected and nontrivial quantum phase termed "topological Anderson insulator," which is obtained by introducing impurities in a two-dimensional metal; here disorder not only causes metal-insulator transition, as anticipated, but is fundamentally responsible for creating extended edge states. We determine the phase diagram of the topological Anderson insulator and outline its experimental consequences. PMID:19392389

Li, Jian; Chu, Rui-Lin; Jain, J K; Shen, Shun-Qing

2009-04-01

8

53. View from ground level in building no. 105 showing ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

53. View from ground level in building no. 105 showing lower radar scanner switch with incoming waveguide and control switch. - Clear Air Force Station, Ballistic Missile Early Warning System Site II, One mile west of mile marker 293.5 on Parks Highway, 5 miles southwest of Anderson, Anderson, Denali Borough, AK

9

55. View from ground level in building no. 105 showing ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

55. View from ground level in building no. 105 showing lower radar scanner switch with eighty-eight 1-1/2" diameter copper ion return RF balance tube systems. - Clear Air Force Station, Ballistic Missile Early Warning System Site II, One mile west of mile marker 293.5 on Parks Highway, 5 miles southwest of Anderson, Anderson, Denali Borough, AK

10

30. View of mezzanine floor level in transmitter building no. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

30. View of mezzanine floor level in transmitter building no. 102 showing control transmitter electronic cabinets and control modules. - Clear Air Force Station, Ballistic Missile Early Warning System Site II, One mile west of mile marker 293.5 on Parks Highway, 5 miles southwest of Anderson, Anderson, Denali Borough, AK

11

Anderson Localization of Solitons  

SciTech Connect

At low temperature, a quasi-one-dimensional ensemble of atoms with an attractive interaction forms a bright soliton. When exposed to a weak and smooth external potential, the shape of the soliton is hardly modified, but its center-of-mass motion is affected. We show that in a spatially correlated disordered potential, the quantum motion of a bright soliton displays Anderson localization. The localization length can be much larger than the soliton size and could be observed experimentally.

Sacha, Krzysztof; Zakrzewski, Jakub [Instytut Fizyki imienia Mariana Smoluchowskiego and Mark Kac Complex Systems Research Center, Uniwersytet Jagiellonski, ulica Reymonta 4, PL-30-059 Krakow (Poland); Laboratoire Kastler-Brossel, UPMC, ENS, CNRS, 4 Place Jussieu, F-75005 Paris (France); Mueller, Cord A. [Laboratoire Kastler-Brossel, UPMC, ENS, CNRS, 4 Place Jussieu, F-75005 Paris (France); Physikalisches Institut, Universitaet Bayreuth, D-95440 Bayreuth (Germany); Delande, Dominique [Laboratoire Kastler-Brossel, UPMC, ENS, CNRS, 4 Place Jussieu, F-75005 Paris (France)

2009-11-20

12

Anderson localization of solitons.  

PubMed

At low temperature, a quasi-one-dimensional ensemble of atoms with an attractive interaction forms a bright soliton. When exposed to a weak and smooth external potential, the shape of the soliton is hardly modified, but its center-of-mass motion is affected. We show that in a spatially correlated disordered potential, the quantum motion of a bright soliton displays Anderson localization. The localization length can be much larger than the soliton size and could be observed experimentally. PMID:20366020

Sacha, Krzysztof; Müller, Cord A; Delande, Dominique; Zakrzewski, Jakub

2009-11-17

13

Anderson-Fabry Disease  

Microsoft Academic Search

Anderson-Fabry disease is a multisystemic lysosomal storage disorder due to a deficiency of ?-galactosidase A resulting in\\u000a an accumulation of neutral glycosphingolipids. Due to its rare occurrence the disease is often misdiagnosed or the correct\\u000a diagnose is delayed for many years (Weidemann et al. 2008). Dermatologists except ophthalmologists play the most important role for early diagnosis of this disorder, which

Anna-Christine Hauser

14

Screened Anderson model  

Microsoft Academic Search

The occupation number (nf) of the impurity orbital (f) in the Anderson model is calculated as a function of the orbital energy (?f), taking into account finite values for the Coulomb interactions between the impurity and the conduction electrons (G) and between two electrons inside of the localized orbital (U). For small values of G, the transitions f2-->f1-->f0 occur, with

H. O. Frota; G. D. Mahan

1991-01-01

15

On the level system of Bi II  

NASA Astrophysics Data System (ADS)

The spectrum of Bi II was remeasured in the wavelength range 620–74 nm, using different hollow cathode light sources, resulting in 91 new classified lines. We found two even and eight odd new levels. Fine and hyperfine structure analysis has been performed with a many configurations approach. We determined for all levels the Landé gJ-factors and the hfs A-constants, using the wavefunctions calculated. For the first time, radial hyperfine structure parameters were determined for the excited configurations 6s26pnl (l = s, p, d, f, g). We will also discuss the important role of configuration interaction effects on fine and hyperfine structures.

Andrzejewska, M.; Meijer, F. G.; Stachowska, E.

2013-10-01

16

Ground State of Anderson Hamiltonian  

NASA Astrophysics Data System (ADS)

Following the Wiegmann approach the exact expression of the ground state energy for the symmetric Anderson Hamiltonian was obtained. In this paper the calculation is done for the asymmetric Anderson Hamiltonian, of the ground state energy, of the average number of localized electrons and of the charge susceptibility.

Kawakami, Norio; Okiji, Ayao

1982-04-01

17

Anderson localization of light near boundaries of disordered photonic lattices  

SciTech Connect

We study numerically the effect of boundaries on Anderson localization of light in truncated two-dimensional photonic lattices in a nonlinear medium. We demonstrate suppression of Anderson localization at the edges and corners, so that stronger disorder is needed near the boundaries to obtain the same localization as in the bulk. We find that the level of suppression depends on the location in the lattice (edge vs corner), as well as on the strength of disorder. We also discuss the effect of nonlinearity on various regimes of Anderson localization.

Jovic, Dragana M. [Institute of Physics, P. O. Box 57, 11001 Belgrade (Serbia); Texas A and M University at Qatar, P. O. Box 23874, Doha (Qatar); Kivshar, Yuri S. [Nonlinear Physics Center, Research School of Physics and Engineering, Australian National University, Canberra ACT 0200 (Australia); Denz, Cornelia [Institut fuer Angewandte Physik and Center for Nonlinear Science (CeNoS), Westfaelische Wilhelms-Universitaet Muenster, D-48149 Muenster (Germany); Belic, Milivoj R. [Texas A and M University at Qatar, P. O. Box 23874, Doha (Qatar)

2011-03-15

18

Anderson localization problems in gapless superconducting phases  

NASA Astrophysics Data System (ADS)

The interplay of Anderson localization and different kinds of superconducting order is most interesting in ``gapless'' cases, i.e. for nonvanishing electron density of states at EF. I present a new renormalization group result for Anderson localization in the gapless type II limit of an Ising superconducting (SC) glass. From this calculation a guess is also made for the XY superconducting glass. In both cases, and in contrast to localization in normal systems, two renormalization constants (one for field- and one for coupling constant renormalization) are necessary (and sufficient). The density of states at EF is singular with exponent ?. For the Ising SC-glass I obtain vI = 1/(d - 2), ?I = 1/2, and ?I = 0, while the XY SC-glass has vXY = 1/(d - 2), ?XY = 1, and ?XY = d - 2, all in leading order of the d - 2 expansion and for E = EF. For E?EF a symmetry argument, and also the calculation given here, predict usual localization behaviour with v = 1/(d - 2), ? = 0, and ? = 2 - d in both cases. The effects of Cooper pairs on localization in the pure superconducting glasses is compared with earlier results showing perfect coexistence of Anderson localization with dirty superconductivity approximately described by a nonrandom order parameter. These limiting cases are embedded in a more general field theory given here, which contains three superconducting order parameters and a conventional pair-breaking mechanism.

Oppenmann, R.

1990-08-01

19

Price-Anderson Act: Congressional review begins  

SciTech Connect

Every 10 years Congress reviews, amends, and extends the Price-Anderson Act of 1957, which was designed to encourage the new nuclear industry by guaranteeing insurance beyond the level provided by private insurers. The Nuclear Regulatory Commission is recommending five congressional actions for the 1987 extension: reauthorization, replacement of the absolute insurance limitation with an annual limitation of liability, raising the retrospective premium per reactor per incident from $5 million to $10 million, raising the statute of limitations on claims for 20 to 30 years, and retaining current language dealing with extraordinary events. Two bills, H.R. 421 and H.R. 3277, were introduced with provisions that broaden the opportunity for victims compensation and eliminate the subsidy aspect. Hearings began in July, with reactions from the National Taxpayers Union and Nuclear insurance underwriters in conflict over the limitations on liability. DOE and DOE contractors urge continuation of the Price-Anderson limitation.

Not Available

1984-07-05

20

Periodic Anderson model with correlated conduction electrons: Variational and exact diagonalization study  

NASA Astrophysics Data System (ADS)

We investigate an extended version of the periodic Anderson model (the so-called periodic Anderson-Hubbard model) with the aim to understand the role of interaction between conduction electrons in the formation of the heavy-fermion and mixed-valence states. Two methods are used: (i) variational calculation with the Gutzwiller wave function optimizing numerically the ground-state energy and (ii) exact diagonalization of the Hamiltonian for short chains. The f-level occupancy and the renormalization factor of the quasiparticles are calculated as a function of the energy of the f orbital for a wide range of the interaction parameters. The results obtained by the two methods are in reasonably good agreement for the periodic Anderson model. The agreement is maintained even when the interaction between band electrons, Ud, is taken into account, except for the half-filled case. This discrepancy can be explained by the difference between the physics of the one- and higher-dimensional models. We find that this interaction shifts and widens the energy range of the bare f level, where heavy-fermion behavior can be observed. For large-enough Ud this range may lie even above the bare conduction band. The Gutzwiller method indicates a robust transition from Kondo insulator to Mott insulator in the half-filled model, while Ud enhances the quasiparticle mass when the filling is close to half filling.

Hagymási, I.; Itai, K.; Sólyom, J.

2012-06-01

21

10. VIEW OF SITE B FROM WEST END OF ANDERSON ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

10. VIEW OF SITE B FROM WEST END OF ANDERSON WAY, FACING NORTHEAST (BUILDINGS 131, 130, 129, and 128 ARE VISIBLE.) - Fort McPherson, World War II Station Hospital, Structures, Bordered by Hardee & Thorne Avenues & Howe Street, Atlanta, Fulton County, GA

22

9. VIEW OF SITE B FROM EAST END OF ANDERSON ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

9. VIEW OF SITE B FROM EAST END OF ANDERSON WAY, FACING WEST (BUILDINGS 126, 128, 129, 130, and 131 ARE VISIBLE.) - Fort McPherson, World War II Station Hospital, Structures, Bordered by Hardee & Thorne Avenues & Howe Street, Atlanta, Fulton County, GA

23

6. VIEW OF SITE A FROM ANDERSON WAY NEAR BUILDING ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

6. VIEW OF SITE A FROM ANDERSON WAY NEAR BUILDING 132, FACING SOUTHEAST (BUILDINGS 124, 122, 120, and 118 ARE VISIBLE.) - Fort McPherson, World War II Station Hospital, Structures, Bordered by Hardee & Thorne Avenues & Howe Street, Atlanta, Fulton County, GA

24

The Anderson Quin Cycle. Final report  

Microsoft Academic Search

The objective of this study was to make a more refined evaluation of the Anderson Quin Cycle based on most recent information on the performance of various elements that will be used in the Anderson Quin Cycle. My original estimate of the work plan for evaluating and optimizing the Anderson Quin Cycle called for 7000 man hours of work. Since

J. H. Anderson; W. M. Bilbow

1993-01-01

25

31. View of mezzanine floor level in transmitter building no. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

31. View of mezzanine floor level in transmitter building no. 102 showing various electronic central indicator panel to control building air conditioning, steam pressure, supply temperature, discharge temperature, supply pressure, transformer vault status, and radome conditioning system. - Clear Air Force Station, Ballistic Missile Early Warning System Site II, One mile west of mile marker 293.5 on Parks Highway, 5 miles southwest of Anderson, Anderson, Denali Borough, AK

26

54. View from ground level in building no. 105 showing ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

54. View from ground level in building no. 105 showing lower radar scanner switch at open port door. Note incoming waveguide and control switch at lower left of photograph and note several waveguides leaving top of scanner switch around the circumference of switch. - Clear Air Force Station, Ballistic Missile Early Warning System Site II, One mile west of mile marker 293.5 on Parks Highway, 5 miles southwest of Anderson, Anderson, Denali Borough, AK

27

52. View from ground level showing lower radar scanner switch ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

52. View from ground level showing lower radar scanner switch with open port door in radar scanner building 105 showing emanating waveguides from lower switch in vertical run; photograph also shows catwalk to upper scanner switch in upper left side of photograph and structural supports. - Clear Air Force Station, Ballistic Missile Early Warning System Site II, One mile west of mile marker 293.5 on Parks Highway, 5 miles southwest of Anderson, Anderson, Denali Borough, AK

28

Blood Angiotensin II Levels of Normal and Hypertensive Subjects  

Microsoft Academic Search

A specific radioimmunoassay for angiotensin II has shown that its normal concentration in arterial blood is 2·4±1·2 (S.D.) m?g.\\/l00 ml.; the venous level is consistently below this value, being usually 50–75% of it. Definite rises in blood angiotensin II levels were found in some patients with hypertension, both essential and secondary to renal disease. Extremely low levels were observed in

K. J. Catt; M. D. Cain; P. Z. Zimmet; E. Cran

1969-01-01

29

Photoemission spectroscopy for the spin-degenerate Anderson model  

Microsoft Academic Search

A procedure that calculates excitation properties for the Anderson model is reported and applied to photoemission. In the mixed-valence regime, hybridized in the ground state, the one- and two-electron impurity configurations generate two spectral resonances. In the Kondo regime, a phenomenological expression describes the narrow peak at the Fermi level.

H. O. Frota; L. N. Oliveira

1986-01-01

30

Culture Curriculum for German, Level II.  

ERIC Educational Resources Information Center

This teacher's guide to cultural instruction in a level-2 German course is designed to be used with the text "Deutsch, Erstes Buch, Erster Teil." Instructional observations pertain to the seventh through the 12th lessons and comprise the major portion of this text including: )1) die Eisenbahn, (2) Reisen und Essen in Deutschland, (3) die Familie,…

Oetiker, Rosemary

31

Culture Curriculum for German, Level II.  

ERIC Educational Resources Information Center

|This teacher's guide to cultural instruction in a level-2 German course is designed to be used with the text "Deutsch, Erstes Buch, Erster Teil." Instructional observations pertain to the seventh through the 12th lessons and comprise the major portion of this text including: )1) die Eisenbahn, (2) Reisen und Essen in Deutschland, (3) die Familie,…

Oetiker, Rosemary

32

Rare Fluctuation Effects in the Anderson Model of Localization  

NASA Astrophysics Data System (ADS)

Two significant advances in the theory of disordered systems in the past three decades have been (i) the development of large disorder Renormalization Group methods, and (ii) a more concerted effort to study of the effects of rare fluctuations or configurations, such as Griffiths' phenomena. A major problem facing the latter in many-body systems has been the enormous numerical resources needed to see these rare phenomena. In this talk, we examine the issue of rare configuration effects in Anderson's original model of localization (1958). In this talk, we examine the issue of rare configuration effects in Anderson's original model of localization. We show that effects due to resonant tunneling among neighboring sites leads not only to anomalous behavior of electronic eigenstates far in the Lifshitz tail, where the density of states is exponentially suppressed, but also leads to singularities in average properties (i.e. the inverse participation ratio) as a function of energy, where the density of states is large. The singular behavior, which separates resonant, Lifshitz-like states from typical, Anderson-localized states, occurs in the insulating phase, and thus is present in all dimensions [1]. Using the analytic solution of a toy model, as well as numerical results of the Anderson model for several different disorder distributions in dimensions d = 1, 2 and 3, we show that this separation of eigenstates due to rare fluctuations is a ubiquitous property of the Anderson model with bounded disorder. This suggests that the half-century-old model, being solvable in polynomial time, is a prime candidate for detailed numerical studies of rare fluctuation effects in disordered systems. [4pt] [1] Sonika Johri and R. N. Bhatt, arXiv1106.1131; and in preparation.

Bhatt, Ravindra

2012-02-01

33

MD Anderson study explains high platelets in ovarian cancer patients; survival reduced  

Cancer.gov

Highly elevated platelet levels fuel tumor growth and reduce the survival of ovarian cancer patients, an international team of researchers led by scientists at The University of Texas MD Anderson Cancer center reports in the New England Journal of Medicine.

34

2. ANDERSON STREET SCHOOL, 1300 BLOCK BULL STREET, NORTH ELEVATION ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. ANDERSON STREET SCHOOL, 1300 BLOCK BULL STREET, NORTH ELEVATION - Savannah Victorian Historic District, Bounded by Gwinnett, East Broad, West Broad Street & Anderson Lane, Savannah, Chatham County, GA

35

5. ANDERSON STREET SCHOOL, 1300 BLOCK BULL STREET, ENTRANCE GATE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

5. ANDERSON STREET SCHOOL, 1300 BLOCK BULL STREET, ENTRANCE GATE - Savannah Victorian Historic District, Bounded by Gwinnett, East Broad, West Broad Street & Anderson Lane, Savannah, Chatham County, GA

36

Transcript levels and synthesis of photosystem II components in cyanobacterial mutants with inactivated photosystem II genes  

SciTech Connect

After interruption or deletion of the photosystem II genes psbB, psbC, and psbD in the cyanobacterium Synechocystis sp. PCC 6803, thylakoids from such mutants were found to be depleted in a number of photosystem II proteins in addition to those for which the gene(s) had been inactivated. Transcript levels of photosystem II genes were measured and protein pulse-labeling was carried out to determine the reason for this effect. Transcripts of all photosystem II genes except the inactivated one(s) were found to be present in the various mutants. In certain cases, inactivation of one photosystem II gene led to overexpression of another. Protein pulse-labeling experiments using {sup 35}S-methionine, in which not only the rapidly turing over D1 protein but also D2, CP43, and CP47 appear to be preferentially labeled, showed that the mutants studied synthesize the D1 protein as well as other photosystem II proteins whose genes were not inactivated. The fact that, in the various mutants, photosystem II proteins for which the gene is not inactivated are synthesized but do not accumulate in the thylakoid indicates that the psbB, psbC, and psbD gene products are all required for a stable assembly of the photosystem II complex.

Jiujiang Yu; Vermaas, W.F.J. (Arizona State Univ., Tempe (United States))

1990-04-01

37

It's All About the Journey: Walter Anderson  

Microsoft Academic Search

There once was a man who risked everything to bring himself and nature into one thing called art. Go behind the scenes on the journey of The Secret World of Walter Anderson to see how author Hester Bass and illustrator E.B. Lewis collaborated on this award-winning biography of Mississippi’s own Walter Anderson. The exhibition, based on the book featuring the

Hester Bass

2012-01-01

38

CAN FLUORIDATION AFFECT WATER LEAD (II) LEVELS AND LEAD (II) NEUROTOXICITY?  

EPA Science Inventory

Recent reports have attempted to show that certain approaches to fluoridating potable water is linked to increased levels of lead(II) in the blood. We examine these claims in light of the established science and critically evaluate their significance. The completeness of hexafl...

39

4. VIEW OF SITE A FROM ANDERSON WAY, FACING SOUTH/SOUTHWEST. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

4. VIEW OF SITE A FROM ANDERSON WAY, FACING SOUTH/SOUTHWEST. (BUILDINGS 126, 124, 122, 120, and 114 ARE VISIBLE.) - Fort McPherson, World War II Station Hospital, Structures, Bordered by Hardee & Thorne Avenues & Howe Street, Atlanta, Fulton County, GA

40

Localization by bichromatic potentials versus Anderson localization  

SciTech Connect

The one-dimensional propagation of waves in a bichromatic potential may be modeled by the Aubry-Andre Hamiltonian. This, in turn, presents a localization transition that has been observed in recent experiments using ultracold atoms or light. It is shown here that, in contrast to the Anderson model, the localization mechanism has a classical origin, namely it is not due to a quantum suppression of a classically allowed transport process, but rather is produced by a trapping by the potential. Explicit comparisons with the Anderson model as well as with experiments are presented.

Albert, Mathias; Leboeuf, Patricio [Laboratoire de Physique Theorique et Modeles Statistiques, CNRS, Universite Paris Sud, UMR8626, F-91405 Orsay Cedex (France)

2010-01-15

41

Anderson localization in laser-kicked molecules  

NASA Astrophysics Data System (ADS)

The paper explores the prospects of observing the phenomenon of dynamical Anderson localization via nonresonant Raman-type rotational excitation of molecules by periodic trains of short laser pulses. We define conditions for such an experiment and show that current femtosecond technology used for nonadiabatic laser alignment of linear molecules is sufficient for this task. Several observables which can serve as indicators for Anderson localization are suggested for measurement, and the influence of experimental limitations imposed by the laser intensity noise, finite pulse duration, limited number of pulses in a train, and thermal effects is analyzed.

Floß, Johannes; Fishman, Shmuel; Averbukh, Ilya Sh.

2013-08-01

42

Perturbation approach to the ground state of the asymmetric Anderson model  

NASA Astrophysics Data System (ADS)

The ground state of the asymmetric Anderson model for strong d-electron correlation is investigated by perturbation theory in the s-d mixing integral. The d-level fixed at the Fermi level is shown to be almost unoccupied for ?/D-->0, ?(D) being the d-level (conduction-band) width. The case for moderate ?/D is also discussed.

Inagaki, Satoru

1980-01-01

43

Mortality Benefit of Transfer to Level I versus Level II Trauma Centers for Head-Injured Patients  

PubMed Central

Objective To determine whether head-injured patients transferred to level I trauma centers have reduced mortality relative to transfers to level II trauma centers. Data Source/Study Setting Retrospective cohort study of 542 patients with head injury who initially presented to 1 of 31 rural trauma centers in Oregon and Washington, and were transferred from the emergency department to 1 of 15 level I or level II trauma centers, between 1991 and 1994. Study Design A bivariate probit, instrumental variables model was used to estimate the effect of transfer to level I versus level II trauma centers on 30-day postdischarge mortality. Independent variables included age, gender, Injury Severity Scale (ISS), other indicators of injury severity, and a dichotomous variable indicating transfer to a level I trauma center. The differential distance between the nearest level I and level II trauma centers was used as an instrument. Principal Findings Patients transferred to level I trauma centers differ in unmeasured ways from patients transferred to level II trauma centers, biasing estimates based on standard statistical methods. Transfer to a level I trauma center reduced absolute mortality risk by 10.1% (95% confidence interval 0.3%, 22.2%) compared with transfer to level II trauma centers. Conclusions Patients with severe head injuries transferred from rural trauma centers to level I centers are likely to have improved survival relative to transfer to level II centers.

McConnell, K John; Newgard, Craig D; Mullins, Richard J; Arthur, Melanie; Hedges, Jerris R

2005-01-01

44

4. ANDERSON STREET SCHOOL, 1300 BLOCK BULL STREET, DETAIL OF ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

4. ANDERSON STREET SCHOOL, 1300 BLOCK BULL STREET, DETAIL OF FENCE - Savannah Victorian Historic District, Bounded by Gwinnett, East Broad, West Broad Street & Anderson Lane, Savannah, Chatham County, GA

45

3. ANDERSON STREET SCHOOL, 1300 BLOCK BULL STREET, DETAIL OF ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

3. ANDERSON STREET SCHOOL, 1300 BLOCK BULL STREET, DETAIL OF NORTH ELEVATION - Savannah Victorian Historic District, Bounded by Gwinnett, East Broad, West Broad Street & Anderson Lane, Savannah, Chatham County, GA

46

Taking on Titan: Meet Carrie Anderson  

NASA Video Gallery

When she was a little girl, Carrie Anderson dreamed of becoming an astronomer. Now, as a space scientist at NASA Goddard Space Flight Center, Carrie studies the atmosphere on Titan: one of Saturn's moons and the second largest moon in the solar system. Titan is also a model for what the early Earth might have been like.

Genna Duberstein

2010-12-15

47

The Anderson Quin Cycle. Final report  

SciTech Connect

The objective of this study was to make a more refined evaluation of the Anderson Quin Cycle based on most recent information on the performance of various elements that will be used in the Anderson Quin Cycle. My original estimate of the work plan for evaluating and optimizing the Anderson Quin Cycle called for 7000 man hours of work. Since this grant was limited to 2150 man hours, we could not expect to achieve all the objectives within the allotted period of work. However, the most relevant program objectives have been completed as reported here. The analysis generally confirms the results originally estimated in my paper on the subject. (Ref. 2) Further optimizations should show even higher efficiencies. The Anderson Quin Cycle (US Patent applied for) basically consists of 5 elements in the power cycle: A refrigeration system to cool and clean the inlet air before it enters the compressor that supplies air for the gas turbine; a gas turbine consisting of a compressor, combustor, and turbine; a steam boiler and steam turbine system using the heat from the exhaust gas out of the gas turbine; a vapor turbine cycle, which utilizes the condensed heat from the exhaust of the steam turbine and the exhaust gas heat leaving the steam boiler to operate a vapor turbine cycle which utilizes another fluid than water, in this case isobutane; and the fifth element consists of a gas cooler and heat pump system, which removes the heat from the exhaust gas to lower its temperature essentially to atmospheric temperature, and at the same time permits treatment of the exhaust gas to remove acid components such as sulfur dioxide and nitrogen oxides. Current industry accepted component characteristics were incorporated in the performance analysis of the overall cycle, ensuring accurate and meaningful operating predictions. The characteristics and performance of each of the elements are described. The thermal efficiency of the optimized calculated Anderson Quin Cycle is 62 percent.

Anderson, J.H.; Bilbow, W.M.

1993-03-18

48

Quantum phase transitions in a pseudogap Anderson-Holstein model  

NASA Astrophysics Data System (ADS)

We study a pseudogap Anderson-Holstein model of a magnetic impurity level that hybridizes with a conduction band whose density of states vanishes in power-law fashion at the Fermi energy, and couples, via its charge, to a nondispersive bosonic mode (e.g., an optical phonon). The model, which we treat using poor-man's scaling and the numerical renormalization group, exhibits quantum phase transitions of different types depending on the strength of the impurity-boson coupling. For weak impurity-boson coupling, the suppression of the density of states near the Fermi energy leads to quantum phase transitions between strong-coupling (Kondo) and local-moment phases. For sufficiently strong impurity-boson coupling, however, the bare repulsion between a pair of electrons in the impurity level becomes an effective attraction, leading to quantum phase transitions between strong-coupling (charge Kondo) and local-charge phases. Even though the Hamiltonian exhibits different symmetries in the spin and charge sectors, the thermodynamic properties near the two types of quantum phase transition are closely related under spin-charge interchange. Moreover, the critical responses to a local magnetic field (for small impurity-boson coupling) and to an electric potential (for large impurity-boson coupling) are characterized by the same exponents, whose values place these quantum-critical points in the universality class of the pseudogap Anderson model. One specific case of the pseudogap Anderson-Holstein model may be realized in a double-quantum-dot device, where the quantum phase transitions manifest themselves in the finite-temperature linear electrical conductance.

Cheng, Mengxing; Ingersent, Kevin

2013-02-01

49

Materials balance for benzene: Level II. Final report  

SciTech Connect

A Level II materials balance was performed on benzene. Data are reported for benzene production from petroleum by four processes (catalytic reformation, toluene dealkylation, toluene disproportionation, and isolation from pyrolysis gasoline) for production from coal during coking. Amounts of benzene consumed for the synthesis of eight direct derivatives (ethylbenzene, cumene, cyclohexane, nitrobenzene, maleic anhydride, mono- and dichlorobenzene, alkylbenzenes, and biphenyl) and exports are presented. These uses constitute approximately 99 percent of total benzene usage. Nonconsumptive uses (solvents and pesticide component) are also tabulated. Releases due to each of the above processes are reported or estimated where possible using published and unpublished data. In addition, releases due to indirect production (refinery operation, coke oven operations, oil spills, non-ferrous metals manufacturing, ore mining, wood processing, coal mining, and two phases of the textile industry) are presented. Production of benzene as a component of gasoline and releases due to all phases of gasoline use are estimated. Locations of sites with high levels of benzene releases due to production and use are tabulated: the major 'hotspots' are Baton Rouge, Louisiana; Houston/Galveston, Texas; Midland, Michigan; and Puerto Rico. The uncertainty ranges of all numbers used or derived in this report are evaluated when possible and tabulated. Data gaps are evaluated and general recommendations are presented. The results of the report are summarized in two figures: the Environmental Flow Diagram for benzene in Appendix A, and the Materials Balance Flow Diagram in the Executive Summary.

Hall, R.L.; Burger, R.; Montecalvo, F.

1980-05-01

50

Isolation and Identification of Mycobacterium Tuberculosis: A Guide for the Level II Laboratory.  

National Technical Information Service (NTIS)

This manual was prepared for Level II mycobacteriology laboratories, those that isolate and identify only Mycobacterium tuberculosis. For ease of reference, the manual is divided into 8 sections: I. Safety, II. Collection and Transportation of Speciments,...

B. E. Strong G. P. Kubica

1981-01-01

51

Intrarenal angiotensin II: Interstitial and cellular levels and site of production  

Microsoft Academic Search

Intrarenal angiotensin II: Interstitial and cellular levels and site of production.BackgroundBoth local production and angiotensin II subtype 1 (AT1) receptor-mediated uptake from the circulation contribute to the high levels of angiotensin (Ang) II in the kidney. It is largely unknown where Ang II is produced in the kidney and how much of it originates from the circulation.MethodsThe concentrations of endogenous

Jorge P Van Kats; Maarten A D H Schalekamp; Pieter D Verdouw; Dirk J Duncker; AH Jan Danser

2001-01-01

52

Histopathologic study of recurrent Clark level II melanomas.  

PubMed

Overall, the prognosis for thin lesions of melanoma (less than 0.76 mm) is excellent. However, a number of melanoma patients with seemingly innocuous lesions have been reported to develop recurrences. For this reason, we examined histologic sections taken from eight cases of Clark level II melanoma that unexpectedly recurred, and compared their histopathologic features with an equal number of nonrecurrent lesions in whom reliable clinical follow-up data were available. Prognostic variables including Breslow thickness, mitotic rate, ulceration, the presence or absence of regression, a vertical growth phase component, and an associated banal nevus were evaluated in a double blind manner. When attempts were made to predict outcome based on one or more prognostic variables, the only correlation of statistical significance was the Breslow thickness (P = 0.04). A Breslow thickness greater than 0.4 mm was associated with a significantly shorter disease free interval than a thickness below 0.4 mm. There was no significant correlation between predicted outcome based on the histologic features examined and the eventual outcome based on history of recurrence (P = 0.36). These data indicate that although prognostic models that predict outcome in melanoma are generally reliable, there is a sizable population of patients with thin melanomas that do worse than would be expected. PMID:8516604

Glass, L F; Guffey, J M; Schroer, K R; Reintgen, D

53

Anderson-Darling Test based CFAR Detection  

Microsoft Academic Search

An Anderson-Darling(A-D) test based CFAR detector feasible for multiple interfering targets and clutter edge scenarios is proposed and referred as AD-CFAR, which exploits K-sample A-D hypothesis test technique to censor clutter blocks needed for power estimation. Thereafter, AD test is employed for distribution test of the resultant homogenous blocks to select the proper detection algorithm from strategy library composed by

Zhang Wei; Zhang Gong; Qian Guoming

2009-01-01

54

Universal mechanism for Anderson and weak localization  

PubMed Central

Localization of stationary waves occurs in a large variety of vibrating systems, whether mechanical, acoustical, optical, or quantum. It is induced by the presence of an inhomogeneous medium, a complex geometry, or a quenched disorder. One of its most striking and famous manifestations is Anderson localization, responsible for instance for the metal-insulator transition in disordered alloys. Yet, despite an enormous body of related literature, a clear and unified picture of localization is still to be found, as well as the exact relationship between its many manifestations. In this paper, we demonstrate that both Anderson and weak localizations originate from the same universal mechanism, acting on any type of vibration, in any dimension, and for any domain shape. This mechanism partitions the system into weakly coupled subregions. The boundaries of these subregions correspond to the valleys of a hidden landscape that emerges from the interplay between the wave operator and the system geometry. The height of the landscape along its valleys determines the strength of the coupling between the subregions. The landscape and its impact on localization can be determined rigorously by solving one special boundary problem. This theory allows one to predict the localization properties, the confining regions, and to estimate the energy of the vibrational eigenmodes through the properties of one geometrical object. In particular, Anderson localization can be understood as a special case of weak localization in a very rough landscape.

Filoche, Marcel; Mayboroda, Svitlana

2012-01-01

55

Influence of Anderson and Keggin heteropoly compounds as precursors of oxide phases in hydrotreating catalysts on their performance  

Microsoft Academic Search

Unpromoted and nickel-promoted catalysts were synthesized on the basis of the Anderson heteropoly compounds (NH4)6 ? x\\u000a [X\\u000a \\u000a x\\u000a (OH)6Mo6O18] · nH2O, where heteroatom X is Cr(III), Mn(II), Fe(II), Ni(II), Co(II), Cu(II), Zn(II), or Ga(III), and their activity in the thiophene hydrogenolysis\\u000a reaction and hydrofining of diesel fraction was examined. It was shown that the most active hydrotreating catalysts under

N. N. Tomina; P. A. Nikul’shin; A. A. Pimerzin

2008-01-01

56

Spectrum and energy levels of singly ionized cesium: I. Revision and extension of the Cs II energy levels  

SciTech Connect

The experimental determined energy levels of Cs II have been revised and extended based entirely on recent observations of the spectrum. Most observed lines have been classified as transitions between 118 even and 167 odd energy levels. Of these 285 levels, 233 have not been previously reported. All the levels have been assigned designations in the jK coupling notation based on theoretical interpretation of the structure and empirical factors. Hyperfine splitting constants are given for 167 levels. By fitting polarization and extended Ritz formulas to selected Rydberg series, the Cs II ionization energy has been determined to be 186 777.4(5) cm/sup -1/.

Sansonetti, C.J.; Andrew, K.L.

1986-03-01

57

John Anderson’s development of (situational) realism and its bearing on psychology today  

Microsoft Academic Search

In 1927, the Scottish philosopher John Anderson arrived in Australia to take up the chair of Philosophy at the University of Sydney. By the late 1930s, the ‘macrostructure’ of his realist system was in place. It includes a theory of process and a substantial metaphysics, one that opposes positivism, linguistic philosophy and all forms of idealism. However, beyond Australia it

Fiona J. Hibberd

2009-01-01

58

Kondo behavior in the asymmetric Anderson model: Analytic approach  

NASA Astrophysics Data System (ADS)

The low-temperature behavior of the asymmetric single-impurity Anderson model is studied by diagrammatic methods resulting in analytically controllable approximations. We first discuss the ways one can simplify parquet equations in critical regions of singularities in the two-particle vertex. The scale vanishing at the critical point defines the Kondo temperature at which the electron-hole correlation function saturates. We show that a two-particle criticality exists at any filling of the impurity level. A quasiparticle resonance peak in the spectral function, however, forms only in almost electron-hole symmetric situations. We relate the Kondo temperature with the width of the resonance peak. Finally, we discuss the existence of satellite Hubbard bands in the spectral function.

Janiš, Václav; Augustinský, Pavel

2008-02-01

59

Dynamics of Anderson localization in open 3D media.  

PubMed

We develop a self-consistent theoretical approach to the dynamics of Anderson localization in open three-dimensional (3D) disordered media. The approach allows us to study time-dependent transmission and reflection, and the distribution of decay rates of quasimodes of 3D disordered slabs near the Anderson mobility edge. PMID:16486824

Skipetrov, S E; van Tiggelen, B A

2006-02-01

60

Microwave-Driven Atoms: From Anderson Localization to Einstein's Photoeffect  

SciTech Connect

We study the counterpart of Anderson localization in driven one-electron Rydberg atoms. By changing the initial Rydberg state at fixed microwave frequency and interaction time, we numerically monitor the crossover from Anderson localization to the photoeffect in the atomic ionization signal.

Schelle, Alexej [Physikalisches Institut der Albert-Ludwigs-Universitaet, Hermann-Herder-Strasse 3, D-79104 Freiburg (Germany); Laboratoire Kastler-Brossel, Universite Pierre et Marie Curie-Paris 6, ENS, CNRS, 4, Place Jussieu, F-75005 Paris (France); Delande, Dominique [Laboratoire Kastler-Brossel, Universite Pierre et Marie Curie-Paris 6, ENS, CNRS, 4, Place Jussieu, F-75005 Paris (France); Buchleitner, Andreas [Physikalisches Institut der Albert-Ludwigs-Universitaet, Hermann-Herder-Strasse 3, D-79104 Freiburg (Germany)

2009-05-08

61

Historical and Architectural Survey of Anderson County, South Carolina.  

National Technical Information Service (NTIS)

TRC, Inc. conducted a historic resources survey of Anderson County, South Carolina. The work was undertaken on behalf of the County of Anderson and was funded by a matching grant provided by South Carolina Department of Parks, Recreation, and Tourism (PRT...

J. S. Revels M. Sherrer

2002-01-01

62

Practice Effects and Composition: A Reply to Anderson  

Microsoft Academic Search

Anderson (1989) argues that our results (Carlson, Sullivan, & Schneider, 1989) confirm several predictions of the ACT* account of skill acquisition, including the occurrence of composition. The ACT* theory does include mechanisms that can account for the major ordinal results of our experiment. However, the quantitative implications of the mechanisms that Anderson invokes to support the occurrence of composition result

Richard A. Carlson; Walter Schneider

1989-01-01

63

Note on Anderson's "Causal Models in Educational Research: Nonrecursive Models."  

ERIC Educational Resources Information Center

|Contrary to Anderson (EJ 187 936), his rule for equation identification is a necessary but not sufficient condition; furthermore, the choice of two-stage or ordinary least squares depends on results and not on methodological properties of estimators. Modification of Anderson's rule and a means for choosing between estimates is offered.…

Shapiro, Jonathan

1979-01-01

64

ESR of a magnetic impurity in the Anderson model  

Microsoft Academic Search

The renormalization group technique is applied to calculate the ESR spin relaxation rate T1-1 of a well-defined magnetic moment in the neighborhood of a spin degenerate Anderson impurity. The effect of the Anderson impurity on T1-1 is analyzed by varying continuously its configuration from doubly to singly occupied, spotlighting the intermediate valence and the Kondo regime.

J. W. M. Pinto; H. O. Frota

2001-01-01

65

ESR of a magnetic impurity in the Anderson model  

Microsoft Academic Search

The renormalization group technique is applied to calculate the ESR spin relaxation rate T1?1 of a well-defined magnetic moment in the neighborhood of a spin degenerate Anderson impurity. The effect of the Anderson impurity on T1?1 is analyzed by varying continuously its configuration from doubly to singly occupied, spotlighting the intermediate valence and the Kondo regime.

J. W. M Pinto; H. O Frota

2001-01-01

66

Inhalation and Ingestion Intakes with Associated Dose Estimates for Level II and Level III Personnel Using Capstone Study Data  

Microsoft Academic Search

Depleted uranium (DU) intake rates and subsequent dose rates were estimated for personnel entering armored combat vehicles perforated with DU penetrators (level II and level III personnel) using data generated during the Capstone Depleted Uranium (DU) Aerosol Study. Inhalation intake rates and associated dose rates were estimated from cascade impactors worn by sample recovery personnel and from cascade impactors that

Frances Szrom; Gerald A. Falo; Gordon M. Lodde; MaryAnn Parkhurst; Eric G. Daxon

2009-01-01

67

The Role of Contrast in the Perception of Achromatic Transparency: Comment on Singh and Anderson (2002) and Anderson (2003)  

ERIC Educational Resources Information Center

M. Singh and B. L. Anderson proposed a perceptual theory of achromatic transparency in which the perceived transmittance of a perceived transparent filter is determined by the ratio of the Michelson contrast seen in the region of transparency to that of the background seen directly. Subsequently, B. L. Anderson, M. Singh, and J. Meng proposed that…

Albert, Marc K.

2008-01-01

68

The Role of Contrast in the Perception of Achromatic Transparency: Comment on Singh and Anderson (2002) and Anderson (2003)  

ERIC Educational Resources Information Center

|M. Singh and B. L. Anderson proposed a perceptual theory of achromatic transparency in which the perceived transmittance of a perceived transparent filter is determined by the ratio of the Michelson contrast seen in the region of transparency to that of the background seen directly. Subsequently, B. L. Anderson, M. Singh, and J. Meng proposed…

Albert, Marc K.

2008-01-01

69

Anderson localization makes adiabatic quantum optimization fail.  

PubMed

Understanding NP-complete problems is a central topic in computer science (NP stands for nondeterministic polynomial time). This is why adiabatic quantum optimization has attracted so much attention, as it provided a new approach to tackle NP-complete problems using a quantum computer. The efficiency of this approach is limited by small spectral gaps between the ground and excited states of the quantum computer's Hamiltonian. We show that the statistics of the gaps can be analyzed in a novel way, borrowed from the study of quantum disordered systems in statistical mechanics. It turns out that due to a phenomenon similar to Anderson localization, exponentially small gaps appear close to the end of the adiabatic algorithm for large random instances of NP-complete problems. This implies that unfortunately, adiabatic quantum optimization fails: The system gets trapped in one of the numerous local minima. PMID:20616043

Altshuler, Boris; Krovi, Hari; Roland, Jérémie

2010-06-24

70

The Anderson Reservoir seismic gap - Induced aseismicity?  

USGS Publications Warehouse

A persistent 10-km seismicity gap along the Calaveras fault appears to be related to the presence of the Leroy Anderson Reservoir in the Calaveras-Silver Creek fault zones southeast of San Jose, California. A magnitude-4.7 earthquake occurred at a depth of 5 km in the centre of the gap on October 3, 1973. The sequence of immediate aftershocks usually accompanying shallow earthquakes of this magnitude in central California did not occur. A bridge crossing the reservoir near its southeast end has been severely deformed, apparently the result of tectonic creep on the Calaveras fault. The occurrence of creep and absence of small earthquakes along the Calaveras in the vicinity of the reservoir suggest a transition from stick slip to stable sliding, possibly brought about by increased pore pressure. ?? 1976.

Bufe, C. G.

1976-01-01

71

Anderson localization makes adiabatic quantum optimization fail  

PubMed Central

Understanding NP-complete problems is a central topic in computer science (NP stands for nondeterministic polynomial time). This is why adiabatic quantum optimization has attracted so much attention, as it provided a new approach to tackle NP-complete problems using a quantum computer. The efficiency of this approach is limited by small spectral gaps between the ground and excited states of the quantum computer’s Hamiltonian. We show that the statistics of the gaps can be analyzed in a novel way, borrowed from the study of quantum disordered systems in statistical mechanics. It turns out that due to a phenomenon similar to Anderson localization, exponentially small gaps appear close to the end of the adiabatic algorithm for large random instances of NP-complete problems. This implies that unfortunately, adiabatic quantum optimization fails: The system gets trapped in one of the numerous local minima.

Altshuler, Boris; Krovi, Hari; Roland, Jeremie

2010-01-01

72

Anderson localization of partially incoherent light  

SciTech Connect

We study Anderson localization and propagation of partially spatially incoherent wavepackets in linear disordered potentials, motivated by the insight that interference phenomena resulting from multiple scattering are affected by the coherence of the waves. We find that localization is delayed by incoherence: the more incoherent the waves are, the longer they diffusively spread while propagating in the medium. However, if all the eigenmodes of the system are exponentially localized (as in one- and two-dimensional disordered systems), any partially incoherent wavepacket eventually exhibits localization with exponentially decaying tails, after sufficiently long propagation distances. Interestingly, we find that the asymptotic behavior of the incoherent beam is similar to that of a single instantaneous coherent realization of the beam.

Capeta, D.; Radic, J.; Buljan, H. [Department of Physics, University of Zagreb, PP 332, 10000 Zagreb (Croatia); Szameit, A.; Segev, M. [Physics Department and Solid State Institute, Technion, Haifa 32000 (Israel)

2011-07-15

73

Magnetoresistance of an Anderson insulator of bosons.  

PubMed

We study the magnetoresistance of two-dimensional bosonic Anderson insulators. We describe the change in spatial decay of localized excitations in response to a magnetic field, which is given by an interference sum over alternative tunneling trajectories. The excitations become more localized with increasing field (in sharp contrast to generic fermionic excitations which get weakly delocalized): the localization length ?(B) is found to change as ?(-1)(B)-?(-1)(0)~B(4/5). The quantum interference problem maps onto the classical statistical mechanics of directed polymers in random media (DPRM). We explain the observed scaling using a simplified droplet model which incorporates the nontrivial DPRM exponents. Our results have implications for a variety of experiments on magnetic-field-tuned superconductor-to-insulator transitions observed in disordered films, granular superconductors, and Josephson junction arrays, as well as for cold atoms in artificial gauge fields. PMID:23889427

Gangopadhyay, Anirban; Galitski, Victor; Müller, Markus

2013-07-09

74

Quality assurance plan for the High Level Controller for the CBMS Block II  

Microsoft Academic Search

This document establishes the software Quality Assurance Plan (QAP) for the High Level Controller for the Chemical and Biological Mass Spectrometer Block II (HLC\\/CBMS-II) project activities under the Computing, Robotics, and Education (CRE) Directorate management. It defines the requirements and assigns responsibilities for ensuring, with a high degree of confidence, that project objectives will be achieved as planned. The CBMS

R. W. Reid; I. F. Robbins; K. A. Stewart; C. L. Terry; R. A. Whitaker; D. A. Wolf; J. C. Zager

1997-01-01

75

Estimation of Failure Frequency for Type I and II High Level Waste Tanks  

SciTech Connect

The failure frequency of Type I and Type II High Level Waste tanks was calculated. The degradation mechanism that could lead to large break failure and the credits taken for steps taken to prevent large break failure were considered.

Subramanian, K.H.

2001-05-15

76

Simplicity of eigenvalues in Anderson-type models  

NASA Astrophysics Data System (ADS)

We show almost sure simplicity of eigenvalues for several models of Anderson-type random Schrödinger operators, extending methods introduced by Simon for the discrete Anderson model. These methods work throughout the spectrum and are not restricted to the localization regime. We establish general criteria for the simplicity of eigenvalues which can be interpreted as separately excluding the absence of local and global symmetries, respectively. The criteria are applied to Anderson models with matrix-valued potential as well as with single-site potentials supported on a finite box.

Naboko, Sergey; Nichols, Roger; Stolz, Günter

2013-04-01

77

Identification of new fluorescence processes in the UV spectra of cool stars from new energy levels of Fe II and CR II  

NASA Astrophysics Data System (ADS)

Two fluorescence processes operating in atmospheres of cool stars, symbiotic stars, and the Sun are presented. Two emission lines, at 1347.03 and 1360.17 A, are identified as fluorescence lines of Cr II and Fe II. The lines are due to transitions from highly excited levels, which are populated radiatively by the hydrogen Lyman alpha line due to accidental wavelength coincidences. Three energy levels, one in Cr II and two in Fe II, are reported.

Johansson, Sveneric; Carpenter, Kenneth G.

1988-06-01

78

1\\/N expansion of the nonequilibrium single-impurity Anderson Model  

Microsoft Academic Search

Results are presented for the nonequilibrium single-impurity Anderson model using a large-N approach, where N is the degeneracy of the impurity level. Using the Keldysh formalism, we extend the slave-boson functional integral method of Read and Newns to the out of equilibrium current carrying case. The correlation function for the slave boson is shown to exhibit a long time power

Zurab Ratiani; Aditi Mitra

2009-01-01

79

Anderson-Hubbard model in infinite dimensions  

NASA Astrophysics Data System (ADS)

We present a detailed, quantitative study of the competition between interaction- and disorder-induced effects in electronic systems. For this the Hubbard model with diagonal disorder (Anderson-Hubbard model) is investigated analytically and numerically in the limit of infinite spatial dimensions, i.e., within a dynamical mean-field theory, at half-filling. Numerical results are obtained for three different disorder distributions by employing quantum Monte Carlo techniques, which provide an explicit finite-temperature solution of the model in this limit. The magnetic phase diagram is constructed from the zeros of the inverse averaged staggered susceptibility. We find that at low enough temperatures and sufficiently strong interaction there always exists a phase with antiferromagnetic long-range order. A strong coupling anomaly, i.e., an increase of the Néel temperature for increasing disorder, is discovered. An explicit explanation is given, which shows that in the case of diagonal disorder this is a generic effect. The existence of metal-insulator transitions is studied by evaluating the averaged compressibility both in the paramagnetic and antiferromagnetic phases. A rich transition scenario, involving metal-insulator and magnetic transitions, is found and its dependence on the choice of the disorder distribution is discussed.

Ulmke, M.; Janiš, V.; Vollhardt, D.

1995-04-01

80

Inhalation and Ingestion Intakes with Associated Dose Estimates for Level II and Level III Personnel Using Capstone Study Data  

SciTech Connect

Depleted uranium (DU) intake rates and subsequent dose rates were estimated for personnel entering armored combat vehicles perforated with DU penetrators (level II and level III personnel) using data generated during the Capstone Depleted Uranium (DU) Aerosol Study. Inhalation intake rates and associated dose rates were estimated from cascade impactors worn by sample recovery personnel and from cascade impactors that served as area monitors. Ingestion intake rates and associated dose rates were estimated from cotton gloves worn by sample recovery personnel and from wipe test samples from the interior of vehicles perforated with large caliber DU munitions. The mean DU inhalation intake rate for level II personnel ranged from 0.447 mg h-1 based on breathing zone monitor data (in and around a perforated vehicle) to 14.5 mg h-1 based on area monitor data (in a perforated vehicle). The mean DU ingestion intake rate for level II ranged from 4.8 mg h-1 to 38.9 mg h-1 based on the wipe test data including surface to glove transfer factors derived from the Capstone data. Based on glove contamination data, the mean DU ingestion intake rates for level II and level III personnel were 10.6 mg h-1 was and 1.78 mg h-1, respectively. Effective dose rates and peak kidney uranium concentration rates were calculated based on the intake rates. The peak kidney uranium concentration rate cannot be multiplied by the total exposure duration when multiple intakes occur because uranium will clear from the kidney between the exposures.

Szrom, Fran; Falo, Gerald A.; Lodde, Gordon M.; Parkhurst, MaryAnn; Daxon, Eric G.

2009-03-01

81

Determination of free L-carnitine levels in type II diabetic women with and without complications  

Microsoft Academic Search

Background:Studies on the determination of carnitine levels and nutritional status in patients of type II diabetes.Objective:We designed this study to determine changes of serum-free L-carnitine in type II diabetic women.Design:A cross-sectional study (case–control study).Setting:Clinical of Endocrinology and Metabolism, Sina Hospital, Pharmacological Research Center, Tabriz Medical university, Iran.Patients and methods:Taking into account the importance of the control of diabetes, in the

A Poorabbas; F Fallah; J Bagdadchi; R Mahdavi; A Aliasgarzadeh; Y Asadi; H Koushavar; M Vahed Jabbari; A Poorabbas or F Fallah

2007-01-01

82

Renal involvement in Anderson-Fabry disease.  

PubMed

Anderson-Fabry disease (AFd) is a rare X-linked lisosomal storage disorder of glycosphingolipid (GL) metabolism, caused by a deficiency of the activity of alpha-galactosidase A (alpha-gal A). The progressive accumulation of GL in tissues results in the clinical manifestations of the disease, that are more evident in hemizygous males, and include characteristic skin lesions (angiokeratomas), neurological symptoms (acroparesthesia), ocular features (cornea verticillata), cardiac involvement (left ventricular enlargement, conduction abnormalities), cerebrovascular manifestations (thromboses, hemorrhage, etc.), and kidney involvement with progression to end-stage renal failure (ESRF). ESRF is a common manifestation in hemizygous males (3rd-5th decade) and death occurs around the 5th decade of life because of severe cardiac and/or cerebrovascular complications. Heterozygous females have an attenuated form of this systemic disease. In the kidney, accumulation of GL occurs in the endothelial cells of every vessel, in the epithelial cells of every tubular segment, and in all kinds of glomerular cells. The broad spectrum of renal lesions is a pathophysiological continuum with progressive impairment in the renal function related to continuous intracellular deposition of GL. Electron microscopic study of renal biopsies shows typical osmiophilic inclusion bodies in the cytoplasm of all kind of renal cells, characterized by concentric lamellation of clear and dark layers (35-50 A of periodicity). ESRF is treated by dialysis and kidney transplantation: neither treatment modifies the progression of the cardiovascular and cerebrovascular lesions due to progressive GL deposition. The outcome of kidney transplantation seems to be similar to that found in other non-diabetic patients, but the survival rate on dialysis is lower than in patients with other causes of ESRF. Nowadays, treatment with enzyme replacement infusion with purified alpha-Gal A, produced by a genetically engineered human cell line or Chinese hamster ovocytes, seems to be effective and safe. PMID:12774774

Sessa, Adalberto; Meroni, Mietta; Battini, Graziana; Righetti, Marco; Maglio, Alessia; Tosoni, Antonella; Nebuloni, Manuela; Vago, Gianluca; Giordano, Ferdinando

83

TYPE II COLLAGEN LEVELS CORRELATE WITH MINERALIZATION BY ARTICULAR CARTILAGE VESICLES  

PubMed Central

Objective Pathologic mineralization is common in osteoarthritic cartilage and may be mediated by extracellular organelles known as articular cartilage vesicles (ACV). Paradoxically, ACVs isolated from osteoarthritic human cartilage mineralize poorly in vitro compared to those isolated from normal porcine cartilage. We recently showed that collagens regulate ACV mineralization. We sought to compare collagens and collagen receptors on human and porcine ACVs as a potential explanation of their different mineralization behaviors. Methods ACVs were enzymatically released from old and young human and porcine hyaline articular cartilage. Western blotting was used to determine the presence of collagens I, II, VI, and X, and various collagen receptors on ACVs. Type II collagen was quantified by ELISA. Biomineralization was assessed by measuring uptake of 45Ca by isolated ACVs in agarose gels and ACVs in situ in freeze-thawed cartilage. Results As previously shown, isolated human ACVs mineralized poorly in response to ATP compared to porcine ACVs, but mineralized similarly in situ in freeze-thawed cartilage. Type II collagen levels were 100 fold higher in isolated human than in porcine ACVs. Type II collagen in human ACVs was of high molecular weight. Transglutaminase-crosslinking of type II collagen showed increased collagenase resistance, suggesting a possible explanation for residual collagen on human ACVs. Other collagens and collagen receptors were similar on human and porcine ACVs. Conclusions Higher levels of type II collagen in human ACV preparations, perhaps mediated by increased transglutaminase crosslinking, may contribute to the decreased mineralization observed in isolated human ACVs in vitro.

Jubeck, Brian; Muth, Emily; Gohr, Claudia M.; Rosenthal, Ann K.

2009-01-01

84

Effects of static magnetic field on dissolved oxygen levels in aqueous solutions containing copper(II), iron(II), and heme iron(III) complexes  

Microsoft Academic Search

Trace metal ions like copper and iron play important roles such as binding, transport, and storage of molecular dioxygen in a wide variety of living systems. The effects of static magnetic fields on the dissolved oxygen (DO) levels in aqueous solutions containing copper(II), iron(II), and their bioligand complexes were investigated. The DO levels in aqueous solutions containing the stable copper(II)

Hiromu Sakurai; Hiroyuki Yasui; Keisuke Kunitomi; Masayuki Kamatari; Noritsugu Kaneko; Akihiro Nakayama

2000-01-01

85

Admittance of the SU(2) and SU(4) Anderson quantum RC circuits  

NASA Astrophysics Data System (ADS)

We study the Anderson model as a description of the quantum RC circuit for spin-1/2 electrons and a single level connected to a single lead. Our analysis relies on the Fermi liquid nature of the ground state, which fixes the form of the low-energy effective model. The constants of this effective model are extracted from a numerical solution of the Bethe ansatz equations for the Anderson model. They allow us to compute the charge relaxation resistance Rq in different parameter regimes. In the Kondo region, the peak in Rq as a function of the magnetic field is recovered and proven to be in quantitative agreement with previous numerical renormalization group results. In the valence-fluctuation region, the peak in Rq is shown to persist, with a maximum value of h/2e2, and an analytical expression is obtained using perturbation theory. We extend our analysis to the SU(4) Anderson model where we also derive the existence of a giant peak in the charge relaxation resistance.

Filippone, Michele; Le Hur, Karyn; Mora, Christophe

2013-07-01

86

Low level RF system design for the PEP-II B factory.  

National Technical Information Service (NTIS)

Heavy beam loading in PEP-II has driven the design of the low level RF system to contain feedback loops similar to those used in proton rings. The RF feedback loops control longitudinal coupled-bunch instabilities caused by the beam interaction with the a...

P. Corredoura R. Claus L. Sapozhnikov

1995-01-01

87

Guide for the Training and Qualification of Welding Personnel. Level II - Advanced Welders.  

ERIC Educational Resources Information Center

|This guide is designed to help education and training facilities develop and administer competency-based training programs to qualify and certify trainees in accordance with the American Welding Society (AWS) requirements for level II (advanced) welders. Presented first are the scope, objectives, and requirements of the AWS…

American Welding Society, Miami, FL.

88

Photosystem II Activity, Plastoquinone A Levels, and Fluorescence Characterization of a Virescens Mutant of Barley 1  

PubMed Central

Chloroplasts isolated from seedlings of a virescens mutant of barley (Hordeum vulgare L cv Gateway) grown for 6 days under continuous illumination had lower levels of photosystem II activities on a chlorophyll basis than wild-type seedlings. After 8 days, however, the photosystem II rates of the mutant and wild-type were approximately equal. Lower levels of the photosystem II activities in the mutant were correlated with a smaller functional plastoquinone pool size as determined by room temperature fluorescence induction. Higher levels of extractable plastoquinone A on a chlorophyll basis, however, were obtained from mutant chloroplasts. An increased room temperature fluorescence yield in the mutant was shown to be due to a higher level of initial fluorescence. A decreased sigmoidicity in the room temperature fluorescence induction transient in the presence of diuron and an increased 77 K fluorescence emission at 680 nanometers lead us to believe that a certain population of the light harvesting chlorophyll protein complex in the mutant membranes is unconnected to photo-system II reaction centers. Although photochemical activities of the mutant approach wild-type values as the mutant develops, the population of dissociated light harvesting complexes does not appear to change.

Kyle, David J.; Zalik, Saul

1982-01-01

89

Testing the Order Parameter of the Anderson Transition  

NASA Astrophysics Data System (ADS)

The typical value of the local density of states ?typ, known as a candidate of the order parameter of the Anderson transition, of two-dimensional disordered electron systems with spin--orbit interactions is studied for assessing the validity of ?typ as the order parameter. We show that ?typ behaves critically as ?typ\\propto (Ec-E)? with ?=0.466± 0.095 near the transition point. It is also found that the exponent ? satisfies the scaling relation with the Lipschitz--Hölder exponent ?0. Furthermore, we demonstrate that fluctuations in ?typ at the Anderson transition obey the generalized Gumbel distribution, which is expected to be the universal distribution function of critical fluctuations of order parameters. These results suggest that ?typ is a suitable quantity of the order parameter of the Anderson transition.

Yakubo, Kousuke; Mizutaka, Shogo

2012-10-01

90

Mean-field description of Anderson localization transition  

NASA Astrophysics Data System (ADS)

The Anderson model of noninteracting disordered electrons is studied in high spatial dimensions. In this limit the coupled Bethe-Salpeter equations determining two-particle vertices (parquet equations) reduce to a single algebraic equation for a local vertex. We find a disorder-driven bifurcation point in this equation signaling vanishing of electron diffusion and onset of Anderson localization. There is no bifurcation in d=1,2 where all states are localized. In dimensions d>=3 the mobility edge separating metallic and insulating phase is found for various types of disorder and compared with results of other treatments.

Kolorenc, Jindrich; Janis, Vaclav

2006-03-01

91

Neurological complications of anderson-fabry disease.  

PubMed

Characteristic clinical manifestations of AFD such as acroparesthesias, angiokeratoma, corneal opacity, hypo/ and anhidrosis, gastrointestinal symptoms, renal and cardiac dysfunctions can occur in male and female patients, although heterozygous females with AFD usually seem to be less severely affected. The most prominent CNS manifestations consist of cerebrovascular events such as transient ischaemic attacks (TIAs) and (recurrent) strokes. For the most part, CNS complications in AFD have been attributed to cerebral vasculopathy, including anatomical abnormalities. The natural history of Fabry patients includes transitory cerebral ischaemia and strokes, even in very young persons of both genders. The mechanism is partly due to vascular endothelial accumulation of Gb-3. White matter lesions (WML) on occur MRI. Both males and females can be safely treated with enzyme replacement; and thus screening for Fabry disease of young stroke populations should be considered. There are, however, no hard data of treatment effect on mortality and morbidity. Stroke in Anderson-Fabry disease study of 721 patients with cryptogenic stroke, aged 18-55 years, showed a high prevalence of Fabry disease in this group: 5% (21/432) of men and 3% (7/289) of women. Combining results of both sexes showed that 4% of young patients with stroke of previously unknown cause had Fabry disease, corresponding to about 1-2% of the general population of young stroke patients. Cerebral micro- and macro-vasculopathy have been described in Fabry disease. Neuronal globotriaosylceramide accumulation in selective cortical and brain stem areas including the hippocampus has been reported by autopsy studies in FD, but clinical surrogates as well as the clinical relevance of these findings have not been investigated so far. Another Neurologic hallmark of Fabry disease (FD) includes small fiber neuropathy as well as cerebral micro- and macroangiopathy with premature stroke. Cranial MRI shows progressive white matter lesions (WML) at an early age, increased signal intensity in the pulvinar, and tortuosity and dilatation of the larger vessels. Conventional MRI shows a progressive load of white matter lesions (WMLs) due to cerebral vasculopathy in the course of FD. Another study has been conducted to quantify brain structural changes in clinically affected male and female patients with FD. The peripheral neuropathy in Fabry disease manifests as neuropathic pain, reduced cold and warm sensation and possibly gastrointestinal disturbances. Patients with Fabry disease begin having pain towards the end of the first decade of life or during puberty. Children as young as 6 years of age have complained of pain often associated with febrile illnesses with reduced heat and exercise tolerance. The patients describe the pain as burning that is often associated with deep ache or paresthesiae. Some patients also have joint pain. A high proportion of patients with Fabry disease is at increased risk of developing neuropsychiatric symptoms, such as depression and neuropsychological deficits. Due to both somatic and psychological impairment, health-related quality of life (QoL) is considerably reduced in patients with Fabry disease. Targeted screening for Fabry disease among young individuals with stroke seems to disclose unrecognized cases and may therefore very well be recommended as routine in the future. Furthermore, ischemic stroke is related to inflammation and arterial stiffness and no study had addressed this relationship in patients with AF disease and cerebrovascular disease, so this topic could represent a possible future research line. PMID:23448452

Tuttolomondo, Antonino; Pecoraro, Rosaria; Simonetta, Irene; Miceli, Salvatore; Arnao, Valentina; Licata, Giuseppe; Pinto, Antonio

2013-01-01

92

The Innocence Project, Marvin AndersonSite: DNA Interactive (www.dnai.org)  

NSDL National Science Digital Library

Interviewee: Marvin Anderson DNAi Location:Applications>Human identification>Innocence>DNA and the Innocence Project On February 28, 2003, Marvin Anderson spoke at a function celebrating the 50th anniversary of the discovery of the structure of DNA.

2008-03-26

93

The Bootstrap Multiscale Analysis for the Multi-particle Anderson Model  

NASA Astrophysics Data System (ADS)

We extend the bootstrap multi-scale analysis developed by Germinet and Klein to the multi-particle Anderson model, obtaining Anderson localization, dynamical localization, and decay of eigenfunction correlations.

Klein, Abel; Nguyen, Son T.

2013-06-01

94

Anderson localization for Bernoulli and other singular potentials  

Microsoft Academic Search

We prove exponential localization in the Anderson model under very weak assumptions on the potential distribution. In one dimension we allow any measure which is not concentrated on a single point and possesses some finite moment. In particular this solves the longstanding problem of localization for Bernoulli potentials (i.e., potentials that take only two values). In dimensions greater than one

Rene Carmona; Abel Klein; Fabio Martinelli

1987-01-01

95

Typical-Medium Theory of Mott-Anderson Localization  

NASA Astrophysics Data System (ADS)

The Mott and the Anderson routes to localization have long been recognized as the two basic processes that can drive the metal-insulator transition (MIT). Theories separately describing each of these mechanisms were discussed long ago, but an accepted approach that can include both has remained elusive. The lack of any obvious static symmetry distinguishing the metal from the insulator poses another fundamental problem, since an appropriate static order parameter cannot be easily found. More recent work, however, has revisited the original arguments of Anderson and Mott, which stressed that the key diference between the metal end the insulator lies in the dynamics of the electron. This physical picture has suggested that the "typical" (geometrically averaged) escape rate ? typ-1 = exp < ln ? esc-1> from a given lattice site should be regarded as the proper dynamical order parameter for the MIT, one that can naturally describe both the Anderson and the Mott mechanism for localization. This article provides an overview of the recent results obtained from the corresponding Typical-Medium Theory, which provided new insight into the the two-fluid character of the Mott-Anderson transition.

Dobrosavljevi?, V.

96

Exact superconducting ground states of the extended Anderson model  

NASA Astrophysics Data System (ADS)

We obtain exact ground states of an extended periodic Anderson model (EPAM) with non-local hybridization and Coulomb repulsion between f and c electrons (Falicov-Kimball term) in one dimension. We show that for a range of parameter values these ground states exhibit composite hole pairing and superconductivity that originate from purely electronic interactions.

Sarasua, L. G.

2011-10-01

97

A characterization of the Anderson metal-insulator transport transition  

Microsoft Academic Search

We investigate the Anderson metal-insulator transition for random Schrodinger operators. We define the strong insulator region to be the part of the spectrum where the random operator ex- hibits strong dynamical localization in the Hilbert-Schmidt norm. We introduce a local transport exponent ?(E), and set the metallic trans- port region to be the part of the spectrum with nontrivial transport

Francois Germinet; Abel Klein

2001-01-01

98

A Management Analysis of the City of Anderson Transit System.  

National Technical Information Service (NTIS)

The basic purpose of the report is to evaluate the previous management structure of the City of Anderson Transportation System (CATS), and to identify and evaluate any changes which have occurred. The main focus of this document is the description of the ...

E. M. Demos

1978-01-01

99

Synthesis, cytotoxicity and DNA binding levels of tri-functional mononuclear platinum(II) complexes  

Microsoft Academic Search

Seven new tri-functional mononuclear platinum(II) complexes (a–g) have been synthesized and characterized by elemental analysis, conductivity, thermal analysis, IR, UV and 1H NMR spectral techniques. The cytotoxicity of these complexes was tested by MTT and SRB assays. The cell cycle analysis and the levels of total platinum bound to DNA were measured by flow cytometry and ICP-MS. The results indicate

Jinchao Zhang; Yuqiu Gong; Xiaoming Zheng; Mengsu Yang; Jingrong Cui

2008-01-01

100

Synthesis, cytotoxicity and DNA-binding levels of new type binuclear platinum(II) complexes  

Microsoft Academic Search

Six new type binuclear platinum(II) complexes (a–f) have been synthesized and characterized by elemental analysis, conductivity, thermal analysis, IR, UV, 1H NMR and mass spectra techniques. The cytotoxicity of the complexes was tested by MTT and SRB assays. The cell cycle analysis and the levels of total platinum bound to DNA were measured by flow cytometry and ICP-MS, respectively. The

Jinchao Zhang; Yaping Li; Jing Sun; Wenxian Li; Yuqiu Gong; Xiaoming Zheng; Jingrong Cui; Ruiqing Wang; Jun Wu

2009-01-01

101

Level II Milestone Review of LLNL Program on Grain-Scale Dynamics in Explosives  

Microsoft Academic Search

This document describes an evaluation of the Level II Milestone achievements of the LLNL program on Grain-Scale Dynamics in Explosives on January 14, 2003. ''The Grain-Scale Dynamics in Explosives Program'' is a mixture of advanced computational methodology and physico-chemical theory applied to understanding deflagration and detonation of plastic-bonded explosives from the nano to the macro scales. At many points, the

M F Nicol; D J Benson; S Yip

2003-01-01

102

Angiotensin II receptor blockade with valsartan decreases plasma osteopontin levels in patients with essential hypertension  

Microsoft Academic Search

Osteopontin (OPN) has recently emerged as a key factor in both vascular remodelling and development of atherosclerosis. It has been reported that OPN is regulated by the renin–angiotensin–aldosterone system (RAAS). The aim of this study was to clarify the effect of angiotensin II receptor blockade with valsartan on plasma OPN levels in patients with essential hypertension (EHT). Forty-six patients (mean

M Kurata; T Okura; J Irita; D Enomoto; T Nagao; M Jotoku; K Miyoshi; V R Desilva; J Higaki

2011-01-01

103

Reconstructing Northern Hemisphere upper-level fields during World War II  

Microsoft Academic Search

Monthly mean fields of temperature and geopotential height (GPH) from 700 to 100 hPa were statistically reconstructed for the extratropical Northern Hemisphere for the World War II period. The reconstruction was based on several hundred predictor variables, comprising temperature series from meteorological stations and gridded sea level pressure data (1939-1947) as well as a large amount of historical upper-air data

S. Brönnimann; J. Luterbacher

2004-01-01

104

Louisa Garrett Anderson (1873-1943), surgeon and suffragette.  

PubMed

Louisa Garrett Anderson, daughter of Britain's first woman doctor, has been largely forgotten today despite the fact that her contribution to the women's movement was as great as that of her mother. Recognized by her contemporaries as an important figure in the suffrage campaign, Anderson chose to lend her support through high-profile action, being one of the few women doctors in her generation who risked their professional as well as their personal reputation in the fight for women's rights by becoming a suffragette - in her case, even going so far as to spend a month in prison for breaking a window on a demonstration. On the outbreak of war, with only the clinical experience she had gained as outpatient surgeon in a women's hospital, Anderson established a series of women-run military hospitals where she was a Chief Surgeon. The most successful was the Endell Street Military Hospital in London, funded by the Royal Army Medical Corps and the only army hospital ever to be run and staffed entirely by women. Believing that a doctor had an obligation to take a lead in public affairs, Anderson continued campaigning for women's issues in the unlikely setting of Endell Street, ensuring that their activities remained in the public eye through constant press coverage. Anderson's achievement was that her work played no small part in expunging the stigma of the militant years in the eyes of the public and - more importantly - was largely instrumental in putting women doctors on equal terms with their male colleagues. PMID:18952990

Geddes, Jennian F

2008-11-01

105

Lattice density functional theory of the single-impurity Anderson model: Development and applications  

NASA Astrophysics Data System (ADS)

A lattice density functional theory (LDFT) of the single-impurity Anderson model is presented. In this approach the basic variable is the single-particle density matrix ?ij with respect to the lattice sites and the fundamental unknown functional is the Coulomb interaction energy W[?]. Using general symmetry properties, a two-level ansatz for W[?] in spin-restricted systems is proposed which involves explicitly only the impurity orbital and a single symmetry-adapted conduction-band state. A simple analytical functional dependence of W[?] is derived on the basis of exact results of this two-level problem. The resulting approximation is shown to be exact in two important opposite limits: a totally degenerate conduction band and a conduction band with widely separated discrete levels. Applications to finite rings having N?100 atoms yield very accurate results for ground-state properties such as the kinetic, interaction, and total energy, as well as the occupation and magnetic moment of the local impurity orbital. This holds for all considered interaction strengths, from weak to strong correlations, as well as in the Kondo and intermediate valence regimes. One concludes that the present two-level approximation provides an appropriate framework for investigating subtle electron-correlation effects of the Anderson model within LDFT.

Töws, W.; Pastor, G. M.

2011-06-01

106

COMPREHENSIVE OBSERVATIONS OF THE ULTRAVIOLET SPECTRUM AND IMPROVED ENERGY LEVELS FOR SINGLY IONIZED CHROMIUM (Cr II)  

SciTech Connect

We report new observations of the spectrum of singly ionized chromium (Cr II) in the region 1142-3954 A. The spectra were recorded with the National Institute of Standards and Technology 10.7 m normal-incidence vacuum spectrograph and FT700 vacuum ultraviolet Fourier transform spectrometer. More than 3600 lines are classified as transitions among 283 even and 368 odd levels. The new spectral data are used to re-optimize the energy levels, reducing their uncertainties by a typical factor of 20.

Sansonetti, Craig J.; Nave, Gillian; Reader, Joseph [National Institute of Standards and Technology, Gaithersburg, MD 20899 (United States); Kerber, Florian [European Southern Observatory, D-85748 Garching (Germany)

2012-10-15

107

Pengujian Statistik Anderson Darling bagi Taburan Nilai Ekstrim Teritlak (The Anderson-Darling Test Statistic of the Generalized Extreme Value)  

Microsoft Academic Search

Abstrak Makalah ini mempersembahkan kajian untuk membangun dan menilai pen- gujian statistik Anderson-Darling (AD) dalam menguji kesesuaian taburan nilai ek- strim teritlak (GEV). Jadual nilai kritikal statistik AD dibangunkan berdasarkan khi- kuasa dua Pearson dan kebolehjadian statistik bagi taburan GEV menggunakan sim- ulasi Monte Carlo. Nilai kritikal statistik ini dimodelkan menggunakan persamaan regresi untuk menyediakan persamaan bagi menganggar nilai kritikal

Ani Shabri; Abdul Aziz Jemain

108

Energy levels of neutral californium (249Cf I) and singly ionized californium (249Cf II)  

NASA Astrophysics Data System (ADS)

The californium spectrum emitted by electrodeless lamps has been observed from 2320 to 28600 A (43070 to 3495 cm-1) and the wavelengths of more than 13,000 lines measured. Energy-level analyses have yielded 136 even and 265 odd levels of Cf I and 40 even plus 172 odd levels of Cf II. The hyperfine width and the Lande g value are given for many levels. Twelve electron configurations have been identified for Cf I and four for Cf II. Observations of the hyperfine structures of 249Cf and 251Cf have confirmed the nuclear spins of 9/2 and 1/2 derived from nuclear decay systematics. The sign of the nuclear dipole moment has been determined to be negative for both isotopes. The lowest levels of some configurations of the elements Th through Es have been plotted versus the number of f electrons for the neutral and the singly ionized species. A similar plot for three configurations of the neutral lanthanides and actinides gives a comparison of the electronic structures in these two series.

Conway, John G.; Worden, Earl F.; Blaise, Jean

1995-07-01

109

SAGE II measurements of stratospheric aerosol properties at non-volcanic levels  

NASA Astrophysics Data System (ADS)

Since 2000, stratospheric aerosol levels have been relatively stable and at the lowest levels observed in the historical record. Given the challenges of making satellite measurements of aerosol properties at these levels, we have performed a study of the sensitivity of the product to the major components of the processing algorithm used in the production of SAGE II aerosol extinction measurements and the retrieval process that produces the operational surface area density (SAD) product. We find that the aerosol extinction measurements, particularly at 1020 nm, remain robust and reliable at the observed aerosol levels. On the other hand, during background periods, the SAD operational product has an uncertainty of at least a factor of 2 due to the lack of sensitivity to particles with radii less than 100 nm.

Thomason, L. W.; Burton, S. P.; Luo, B.-P.; Peter, T.

2008-02-01

110

SAGE II measurements of stratospheric aerosol properties at non-volcanic levels  

NASA Astrophysics Data System (ADS)

Since 2000, stratospheric aerosol levels have been relatively stable and at the lowest levels observed in the historical record. Given the challenges of making satellite measurements of aerosol properties at these levels, we have performed a study of the sensitivity of the product to the major components of the processing algorithm used in the production of SAGE II aerosol extinction measurements and the retrieval process that produces the operational surface area density (SAD) product. We find that the aerosol extinction measurements, particularly at 1020 nm, remain robust and reliable at the observed aerosol levels. On the other hand, background periods, the SAD operational product has an uncertainty of at least a factor of 2 due to the lack of sensitivity to particles with radii less than 100 nm.

Thomason, L. W.; Burton, S. P.; Luo, B.-P.; Peter, T.

2007-05-01

111

Status of level-2 products of ADEOS-II validation plan  

NASA Astrophysics Data System (ADS)

The mission objectives of ADEOS-II (Midori-II) are to improve satellite-based global earth observation system, and to obtain earth observation data for the contribution to better understanding and elucidation of global change mechanism relevant to earth environmental issues. To implement the objectives, five onboard earth observation sensors are selected based on the science requirement primarily focused on the quantitative estimation of geophysical parameters to describe important processes of the earth system such as water and energy cycle, carbon cycle, and changes in polar stratospheric ozone. This paper describes the present status of level-2 products derived from AMSR and GLI observation data after the launch, in the middle of operational observation / calibration and validation phase, as of the beginning of August, 2003 after four months from the beginning of calibration and validation phase on April 15, 2003.

Igarashi, Tamotsu; Shibata, Akira; Sasaki, Masayuki; Hashimoto, Toshiaki; Imaoka, Keiji; Nakajima, Takashi Y.; Murakami, Hiroshi; Hori, Masahiro; Yamamoto, Hirokazu; Nakayama, Masashige

2004-02-01

112

Angiotensin-Converting Enzyme Inhibitor Does Not Suppress Renal Angiotensin II Levels in Angiotensin I-Infused Rats  

PubMed Central

Angiotensin II (Ang II) infusion into rats elevates local angiotensin II levels through an AT1 receptor–dependent pathway in the kidney. We examined whether treatment with an angio-tensin-converting enzyme (ACE) inhibitor, temocapril, or an AT1-receptor blocker, olmesartan, prevented elevation of Ang II levels in the kidney of angiotensin I (Ang I)-infused rats. Rats were infused with Ang I (100 ng/min) and treated with temocapril (30 mg/kg per day, n = 10) or olmesartan (10 mg/kg per day, n = 9) for 4 weeks. Ang I infusion significantly elevated blood pressure compared with vehicle-infused rats (n = 6). Treatment with temocapril or olmesartan suppressed Ang I–induced hypertension. Temocapril suppressed both plasma and renal ACE activity. Ang I infusion increased Ang II content in the kidney. Interestingly, temocapril failed to reduce the level of Ang II in the kidney, while olmesartan markedly suppressed an increase in renal Ang II levels. These results suggest a limitation of temocapril and a benefit of olmesartan to inhibit the renal renin–angiotensin system and suggest the possible existence of an ACE inhibitor–insensitive pathway that increases Ang II levels in rat kidney.

Ohnishi, Keisuke; Murase, Miki; Nakano, Daisuke; Pelisch, Nicolas; Hitomi, Hirofumi; Kobori, Hiroyuki; Morimoto, Satoshi; Mori, Hirohito; Masaki, Tsutomu; Ohmori, Koji; Kohno, Masakazu; Ichihara, Atsuhiro; Nishiyama, Akira

2013-01-01

113

Angiotensin-converting enzyme inhibitor does not suppress renal angiotensin II levels in angiotensin I-infused rats.  

PubMed

Angiotensin II (Ang II) infusion into rats elevates local angiotensin II levels through an AT1 receptor-dependent pathway in the kidney. We examined whether treatment with an angiotensin-converting enzyme (ACE) inhibitor, temocapril, or an AT1-receptor blocker, olmesartan, prevented elevation of Ang II levels in the kidney of angiotensin I (Ang I)-infused rats. Rats were infused with Ang I (100 ng/min) and treated with temocapril (30 mg/kg per day, n = 10) or olmesartan (10 mg/kg per day, n = 9) for 4 weeks. Ang I infusion significantly elevated blood pressure compared with vehicle-infused rats (n = 6). Treatment with temocapril or olmesartan suppressed Ang I-induced hypertension. Temocapril suppressed both plasma and renal ACE activity. Ang I infusion increased Ang II content in the kidney. Interestingly, temocapril failed to reduce the level of Ang II in the kidney, while olmesartan markedly suppressed an increase in renal Ang II levels. These results suggest a limitation of temocapril and a benefit of olmesartan to inhibit the renal renin-angiotensin system and suggest the possible existence of an ACE inhibitor-insensitive pathway that increases Ang II levels in rat kidney. PMID:23698111

Ohnishi, Keisuke; Murase, Miki; Nakano, Daisuke; Pelisch, Nicolas; Hitomi, Hirofumi; Kobori, Hiroyuki; Morimoto, Satoshi; Mori, Hirohito; Masaki, Tsutomu; Ohmori, Koji; Kohno, Masakazu; Ichihara, Atsuhiro; Nishiyama, Akira

2013-05-22

114

Plasma levels and zymographic activities of matrix metalloproteinases 2 and 9 in type II diabetics with peripheral arterial disease.  

PubMed

Deregulation of matrix metalloproteinases (MMPs) is an important factor contributing to the development of vascular lesions. Plasma levels and zymographic activities of MMP-2 and MMP-9 were investigated in type II diabetics with (n = 51) or without (n = 42) peripheral artery disease (PAD) and in normal volunteers (n = 23). Plasma MMP-2 levels were higher in type II diabetics with (p < 0.01) or without (p > 0.05) PAD in comparison with normal volunteers. Similarly, type II diabetics with (p < 0.0001) or without (p > 0.05) PAD had higher plasma MMP-9 levels than normal volunteers. Plasma zymographic activities of both MMP-2 and MMP-9 were positively correlated with their plasma levels. Plasma MMP-2 zymographic activity was higher in type II diabetics with PAD than type II diabetics without PAD (p > 0.05). Plasma MMP-9 zymographic activity was higher in type II diabetics with (p < 0.0001) or without (p < 0.0001) PAD in comparision with normal volunteers. Together, these results indicate that increased plasma levels and zymographic activities of MMP-2 and MMP-9 may contribute to PAD in type II diabetics. In particular, plasma MMP-9 may be a useful marker for the development of vascular disease in type II diabetics. PMID:15920993

Signorelli, Salvatore Santo; Malaponte, Grazia; Libra, Massimo; Di Pino, Luigi; Celotta, Gabriella; Bevelacqua, Valentina; Petrina, Marcello; Nicotra, Giuseppina S; Indelicato, Manuela; Navolanic, Patrick M; Pennisi, Giuseppe; Mazzarino, Maria Clorinda

2005-02-01

115

The Ce 4{ital f} surface shift: A test for the Anderson-impurity Hamiltonian  

SciTech Connect

Evidence is provided of the role of the different hybridization strengths between the surface and the bulk in determining the magnitude of the surface shift for the shallow Ce 4{ital f} levels, with respect to the deeper core levels. This was achieved by comparing the photoemission core levels for a weakly hybridized case (CeAl) to a case of intermediate hybridization ({gamma}-Ce). For CeAl a 4{ital f} surface shift of 0.45 eV was observed, similar to that for the 5{ital p} core level, whereas a smaller (if any) 4{ital f} surface shift was observed for {gamma}-Ce. Model calculations based on the Anderson impurity Hamiltonian are shown to give a correct evaluation of this effect, which can be exploited as a way of testing the results of such a description for the Ce {ital f} states. {copyright} {ital 1996 The American Physical Society.}

Duo, L.; De Rossi, S.; Vavassori, P.; Ciccacci, F. [Istituto Nazionale Fisica della Materia--Dipartimento di Fisica, Politecnico di Milano, piazza Leonardo da Vinci 32, I-20133 Milano (Italy); Olcese, G.L. [Dipartimento di Chimica e Chimica Industriale, Universita di Genova, via Dodecaneso 31, I-16146 Genova (Italy); Chiaia, G.; Lindau, I. [Department of Synchrotron Radiation Research, Lund University, Soelvegatan 14, S-22362 Lund (Sweden)

1996-12-01

116

Low energy properties of the two-impurity Anderson model  

NASA Astrophysics Data System (ADS)

We investigate the low energy properties of the two-impurity Anderson model with the complete-Fock-space numerical renormalization group method. From the calculated spectral function, correlation functions and self-energy, two energy scales are identified, as onsets of the Kondo resonance and the Fermi liquid behaviors. With the tuning of the RKKY interaction, the latter is uniformly suppressed to zero in the particle-hole symmetric case, resembling the Jones-Varma quantum critical point. In cases with the particle-hole asymmetry, an inter-impurity hybridization term is generated, which turns the quantum critical point into a crossover. Similar behaviors are found with either a direct hopping term or a local magnetic field, to lift the parity or spin degeneracies, respectively. Application to the Anderson lattice model is also presented.

Zhu, Lijun; Zhu, Jian-Xin

2010-03-01

117

Phase-space signatures of the Anderson transition  

NASA Astrophysics Data System (ADS)

We use the inverse participation ratio based on the Husimi function to perform a phase-space analysis of the Anderson model in one, two, and three dimensions. Important features of the quantum states remain observable in phase space in the large system size limit, while they would be lost in a real- or momentum-space description. From perturbative approaches in the limits of weak and strong disorder, we find that the appearance of a delocalization-localization transition is connected to the coupling, by a weak potential, of momentum eigenstates which are far apart in momentum space. While this is fully consistent with the known dependence of the existence of the Anderson transition on dimensionality, the resulting criterion can be applied to other models as well. The phase-space approach thus sheds new light on the metal-insulator transition.

Wobst, André; Ingold, Gert-Ludwig; Hänggi, Peter; Weinmann, Dietmar

2003-08-01

118

Categorization of nocturnal drainage flows in the Anderson Creek valley  

SciTech Connect

A network of eight meteorological towers was operated over about a one-year period within the Anderson Creek valley in the Geysers Geothermal Area of northern California. The purpose was to define the noctural wind and temperature structure along the valley's sloped surfaces for use in evaluating the frequency of drainage flows throughout the year and to assess the representativeness of the flows observed during the few nights that intensive studies were undertaken. (ACR)

Gudiksen, P.H.; Walton, J.J.

1981-06-01

119

Agalsidase Alfa in the Treatment of Anderson-Fabry Disease  

Microsoft Academic Search

\\u000a Agalsidase alfa is a formulation of the human enzyme ?-galactosidase A (AGAL), generated by activation of the encoding gene\\u000a in a continuous human cell line. The regular infusion of agalsidase alfa into patients with Anderson-Fabry disease (AFD),\\u000a in whom AGAL deficiency can lead to multi-organ system failure, has been demonstrated to be safe. By facilitating the clearance\\u000a of the substrate

Gregory M. Pastores

120

Spectra of Anderson type models with decaying randomness  

Microsoft Academic Search

In this paper we consider some Anderson type models, with free parts having long range tails and with the random perturbations\\u000a decaying at different rates in different directions and prove that there is a.c. spectrum in the model which is pure. In addition,\\u000a we show that there is pure point spectrum outside some interval. Our models include potentials decaying in

M. Krishna; K. B. Sinha

2001-01-01

121

Astronaut Clay Anderson Speaks With S.C. Students  

NASA Video Gallery

From NASA's International Space Station Mission Control Center, NASA astronaut Clay Anderson participates in a Digital Learning Network (DLN) event with students at Crayton Middle School, Columbia, S.C. The DLN connects students and teachers with NASA experts and education specialists using online communication technologies like video/web conferencing and webcasting. Register for free, interactive events listed in the catalog or watch the webcasts. http://dln.nasa.gov

Gerald T Wright

2012-10-04

122

Charge susceptibility of the spin-degenerate Anderson model  

Microsoft Academic Search

We calculated the charge susceptibility of the Anderson model for finite f-f Coulomb interaction U, via a renormalization-group technique. For an occupation number of the f orbital around unity, the spectrum presents two peaks. One peak is centered at the impurity orbital energy ||?f||, and comes from the transition f0-->f1. The other one is centered at the energy ?f+U. It

H. O. Frota

1991-01-01

123

MD Anderson researchers find coupling of proteins promotes glioblastoma development:  

Cancer.gov

Two previously unassociated proteins known to be overly active in a variety of cancers bind together to ignite and sustain malignant brain tumors, a research team led by scientists at The University of Texas MD Anderson Cancer Center reports this week in the journal Cancer Cell. This research is the first to connect FoxM1 to a molecular signaling cascade that regulates normal neural stem cells...

124

Low level RF system design for the PEP-II B factory  

SciTech Connect

Heavy beam loading in PEP-II has driven the design of the low level RF system to contain feedback loops similar to those used in proton rings. The RF feedback loops control longitudinal coupled-bunch instabilities caused by the beam interaction with the accelerating mode of the RF cavities by reducing the cavity impedance observed by the beam. The RF system employs a modular design housed in a VXI environment and uses the EPICS control system. Modem control system design and signal processing is used throughout the system. This paper describes the RF system topology and the signal processing used to fulfill the system requirements.

Corredoura, P.; Claus, R.; Sapozhnikov, L. [and others

1995-10-01

125

Yeast cells expressing differential levels of human or yeast DNA topoisomerase II: a potent tool for identification and characterization of topoisomerase II-targeting antitumour agents  

Microsoft Academic Search

Purpose: To identify and characterize the specificity and potency of topoisomerase II-interacting antitumour drugs in an in vivo\\u000a model utilizing the yeast Saccharomyces cerevisiae. Methods: Four yeast transformants were selected for the expression of either human or yeast DNA topoisomerase II at different, biologically\\u000a relevant, levels under the tight control of promoters of various strengths. Results: Analyses of 24 drugs

Benoît van Hille; Bridget T. Hill

1998-01-01

126

Test of the Singh-Anderson model of transparency.  

PubMed

A new model of achromatic transparency has been recently proposed by Singh and Anderson as an alternative to the model proposed long ago by Metelli. The study reported here compared these models using achromatic stimuli consisting of a transparent disk on a background formed by two adjoining rectangles, with the common border of the rectangles dividing the disk in half. Let a and b denote the luminances of the left and right parts of the background, respectively, and let p and q denote the luminances of the left and right parts of the disk, respectively. The value of b was varied for fixed values of a, p, and q. For these values the Singh-Anderson model predicts that the perceived extent of transparency T of the disk is constant with b, while Metelli's model predicts that T decreases as b increases. Participants rated T. The results confirm the prediction of Metelli's model. It is also shown that the Singh-Anderson model is invalid in principle in that, unlike Metelli's model, it fails to capture the principle of independence of the effects of a, b, p, and q on T. PMID:17879671

Masin, Sergio Cesare; Tommasi, Marco; Da Pos, Osvaldo

2007-06-01

127

Architecture and Performance of the PEP-II Low-Level RF System  

SciTech Connect

Heavy beam loading in the PEP-II B Factory along with large ring circumferences places unique requirements upon the low-level rf (LLRF) system. RF feedback loops must reduce the impedance observed by the beam while ignoring the cavity transients caused by the ion clearing gap. Special attention must be placed on the cavity tuner loops to allow matching the ion clearing gap transients in the high energy ring and the low energy ring. A wideband fiber optic connection to the longitudinal feedback system allows a rf station to operate as a powerful ''sub-woofer'' to damp residual low order coupled bunch motion. This paper describes the design and performance of the VXI based, EPICS controlled, PEP-II low-level rf system(s). Baseband in-phase and quadrature (IQ) signal processing using both analog and modern digital techniques are used throughout the system. A family of digital down converters provide extremely accurate measurements of many rf signals throughout the system. Each system incorporates a built-in network analyzer and arbitrary rf function generator which interface with Matlab to provide a wide range of functions ranging from automated configuration of each feedback loop to cavity FM processing. EPICS based sequences make the entire system a turn-key operation requiring minimal operator intervention. In the event of a fault, fast history buffers throughout the system write selected rf signals to disk files which can be viewed later to help diagnose problems. Actual data from commissioning runs of PEP-II is presented.

Corredoura, Paul L.

1999-04-14

128

Image Restoration with Discrete Constrained Total Variation Part II: Levelable Functions, Convex Priors and Non-Convex Cases  

Microsoft Academic Search

In Part II of this paper we extend the results obtained in Part I for total variation minimization in image restoration towards the following directions: first we investigate the decomposability property of energies on levels, which leads us to introduce the concept of levelable regularization functions (which TV is the paradigm of). We show that convex levelable posterior energies can

Jérôme Darbon; Marc Sigelle

2006-01-01

129

High levels of genetic variation at MHC class II DBB loci in the tammar wallaby ( Macropus eugenii )  

Microsoft Academic Search

High levels of MHC diversity are crucial for immunological fitness of populations, with island populations particularly susceptible\\u000a to loss of genetic diversity. In this study, the level of MHC class II DBB diversity was examined in tammar wallabies (Macropus eugenii) from Kangaroo Island by genotyping class II-linked microsatellite loci and sequencing of DBB genes. Here we show that the\\u000a tammar

Yuanyuan Cheng; Hannah V. Siddle; Stephan Beck; Mark D. B. Eldridge; Katherine Belov

2009-01-01

130

Alterative LEU designs for the FRM-II with power levels of 20-22 MW.  

SciTech Connect

Alternative LEU Designs for the FRM-II have been developed by the RERTR Program at Argonne National Laboratory (ANL) at the request of an FRM-II Expert Group established by the German Federal Government in January 1999 to evaluate the options for using LEU fuel instead of HEU fuel in cores with power levels of 20 MW. The ANL designs would use the same building structure and maintain as many of the HEU design features as practical. The range of potential LEU fuels was expanded from previous studies to include already-tested silicide fuels with uranium densities up to 6.7 g/cm{sup 3} and the new U-Mo fuels that show excellent prospects for achieving uranium densities in the 8-9 g/cm{sup 3} range. For each of the LEU cores; the design parameters were chosen to match the 50 day cycle length of the HEU core and to maximize the thermal neutron flux in the Cold Neutron Source and beam tubes. The studies concluded that an LEU core with a diameter of about 29 cm instead of 24 cm in HEU design and operating at a power level of 20 MW would have thermal neutron fluxes that are 0.85 times that of the HEU design at the center of the Cold Neutron Source. With a potential future upgrade to a power of 22 MW, this ratio would increase to 0.93.

Hanan, N. A.; Smith, R. S.; Matos, J. E.

1999-09-27

131

A Non-invasive Technique for Configuring Low Level RF Feedback Loops in PEP-II  

SciTech Connect

The RF system of the PEP-II collider uses two fast feedback loops around each klystron and set of cavities. These loops reduce the impedance of the fundamental mode of the accelerating cavities seen by the beam, and are necessary to reduce the growth rates of longitudinal modes within the RF system bandwidth. Operation of the accelerator at high beam currents is very sensitive to the configuration of the low-level RF feedback loops. There are 7 loop control parameters that strongly influence the stability of the feedback loops and the achieved level of longitudinal impedance reduction. Diagnostic techniques for the analysis of the RF feedback via closed-loop system transfer function measurements will be presented. The model is fit to the measured closed-loop transfer function data and the extracted parameters are then used to calculate optimal tuning and corrections to the loop control elements in the physical channel. These techniques allow fine-tuning of RF feedback with stored beam as well as diagnosis of misconfigured or malfunctioning elements of the system. Results from PEP-II operation will be presented to illustrate the techniques and their applications.

Teytelman, D; /SLAC

2005-06-22

132

Resistance noise near the Anderson transition  

NASA Astrophysics Data System (ADS)

We discuss the results of 1/f noise measurements made on films of polycrystalline indium oxide and ZnO accumulation layers. In these systems, the amount of static disorder can be readily and reversibly changed by fine-tuning the stoichiometry, which gives one a convenient and unique method to study the sensitivity of the noise to changes in some transport parameters. We present detailed experimental evidence that rules out classical percolation phenomena as an explantation for the high noise level observed in these materials. We elaborate on a qualitative model given by Cohen et al. that ascribes the noise characteristics of these systems to an impending metal-insulator transition and dwell on some of its implications.

Cohen, O.; Ovadyahu, Z.

1994-10-01

133

Development of High Level Trigger Software for Belle II at SuperKEKB  

NASA Astrophysics Data System (ADS)

The Belle collaboration has been trying for 10 years to reveal the mystery of the current matter-dominated universe. However, much more statistics is required to search for New Physics through quantum loops in decays of B mesons. In order to increase the experimental sensitivity, the next generation B-factory, SuperKEKB, is planned. The design luminosity of SuperKEKB is 8 x 1035cm-2s-1 a factor 40 above KEKB's peak luminosity. At this high luminosity, the level 1 trigger of the Belle II experiment will stream events of 300 kB size at a 30 kHz rate. To reduce the data flow to a manageable level, a high-level trigger (HLT) is needed, which will be implemented using the full offline reconstruction on a large scale PC farm. There, physics level event selection is performed, reducing the event rate by ~ 10 to a few kHz. To execute the reconstruction the HLT uses the offline event processing framework basf2, which has parallel processing capabilities used for multi-core processing and PC clusters. The event data handling in the HLT is totally object oriented utilizing ROOT I/O with a new method of object passing over the UNIX socket connection. Also under consideration is the use of the HLT output as well to reduce the pixel detector event size by only saving hits associated with a track, resulting in an additional data reduction of ~ 100 for the pixel detector. In this contribution, the design and implementation of the Belle II HLT are presented together with a report of preliminary testing results.

Lee, S.; Itoh, R.; Katayama, N.; Mineo, S.

2011-12-01

134

The role of contrast in the perception of achromatic transparency: comment on Singh and Anderson (2002) and Anderson (2003).  

PubMed

M. Singh and B. L. Anderson proposed a perceptual theory of achromatic transparency in which the perceived transmittance of a perceived transparent filter is determined by the ratio of the Michelson contrast seen in the region of transparency to that of the background seen directly. Subsequently, B. L. Anderson, M. Singh, and J. Meng proposed that Michelson contrast should be replaced by perceived contrast in this theory. However, their experimental stimuli were nongeneric (i.e., special cases), and their observers had little choice in their matching strategy. Here, the author shows that both of their ratio-of-contrasts theories are incorrect and that problems with their theoretical analyses and experimental designs led them to conclude that mean luminance does not affect perceived transmittance when contrast is held constant. The author also shows that B. L. Anderson's (2003) transmittance anchoring principle is not valid when a transparent surface is perceived to penetrate rather than overlay another surface. Finally, the author shows that M. Singh's (2004) theoretical proof that the ratio-of-Michelson-contrasts theory accurately predicts lightness matching through transparency is incorrect. PMID:18954224

Albert, Marc K

2008-10-01

135

Cepheids in open clusters (Anderson+, 2013)  

NASA Astrophysics Data System (ADS)

Cepheids in open clusters (cluster Cepheids: CCs) are of great importance as zero-point calibrators of the Galactic Cepheid period-luminosity relationship (PLR). We perform an 8-dimensional all-sky census that aims to identify new bona-fide CCs and provide a ranking of membership confidence for known CC candidates according to membership probabilities. The probabilities are computed for combinations of known Galactic open clusters and classical Cepheid candidates, based on spatial, kinematic, and population-specific membership constraints. Data employed in this analysis are taken largely from published literature and supplemented by a year-round observing program on both hemispheres dedicated to determining systemic radial velocities of Cepheids. In total, we find 23 bona-fide CCs, 5 of which are candidates identified for the first time, including an overtone-Cepheid member in NGC 129. We discuss a subset of CC candidates in detail, some of which have been previously mentioned in the literature. Our results indicate unlikely membership for 7 Cepheids that have been previously discussed in terms of cluster membership. We furthermore revisit the Galactic PLR using our bona fide CC sample and obtain a result consistent with the recent calibration by Turner (2010). However, our calibration remains limited mainly by cluster uncertainties and the small number of long-period calibrators. In the near future, Gaia will enable our study to be carried out in much greater detail and accuracy, thanks to data homogeneity and greater levels of completeness. (4 data files).

Anderson, R. I.; Eyer, L.; Mowlavi, N.

2013-07-01

136

Peripheral vascular resistance and angiotensin II levels during pulsatile and no-pulsatile cardiopulmonary bypass.  

PubMed Central

The effects of pulsatile and non-pulsatile cardiopulmonary bypass (CPB) on levels of peripheral vascular resistance and plasma angiotensin II (AII) have been studied in 24 patients submitted to elective cardiac surgical procedures. Twelve patients had conventional non-pulsatile perfusion throughout the period of CPB (non-pulsatile group), while 12 had pulsatile perfusion during the central period of total CPB, using the Stockert pulsatile pump system (pulsatile group). There were no significant differences between the groups in respect of age, weight, bypass time, cross-clamp time, or in mean pump flow or mean perfusion pressure at the onset of CPB. Peripheral vascular resistance index (PVRI) and plasma AII levels were measured at the onset of total CPB and at the end of total CPB. In the non-pulsatile group PVRI rose from 19.6 units to 29.96 units during perfusion. In the pulsatile group PVRI showed little change from 20.89 units to 21.45 units during perfusion (P less than 0.001). Plasma AII levels (normal less than 35 pg/ml) rose during perfusion from 49 pg/ml to 226 pg/ml in the non-pulsatile group. The rise in the pulsatile group from 44 pg/ml to 98 pg/ml was significantly smaller than that in the non-pulsatile group (P less than 0.01). These results indicate that pulsatile cardiopulmonary bypass prevents the rise in PVRI associated with non-pulsatile perfusion, and that this effect may be achieved by preventing excessive activation of the renin-angiotensin system, thus producing significantly lower plasma concentrations of the vasoconstrictor angiotensin II.

Taylor, K M; Bain, W H; Russell, M; Brannan, J J; Morton, I J

1979-01-01

137

Anderson-fabry disease: a multiorgan disease.  

PubMed

Fabry disease (FD) is a rare X-linked lysosomal storage disorder caused by a deficiency of the enzyme ?-galactosidase A. FD causes glycolipids, such as globotriaosylceramide (Gb3), to accumulate in the vascular endothelium of several organs (Fig. 2), including the skin, kidneys, nervous system, and heart, thereby triggering inflammation and fibrosis. These processes generally result in organ dysfunction, which is usually the first clinical evidence of FD. Patients with classic FD have various symptoms, eg, acroparesthesias, hypohidrosis, angiokeratomas, corneal opacities, cerebrovascular lesions, cardiac disorders, andrenal dysfunction.However, evolving knowledge about the natural course of disease suggests that it is more appropriate to describe FD as a disease with a wide spectrum of heterogeneously progressive clinical phenotypes. Indeed, most female heterozygotes develop symptoms due to yet undetermined mechanisms and a high percentage of females develops vital organ involvement including the kidneys, heart and/or brain about a decade later than males. Renal failure is a serious complication of this disease. Fabry nephropathy lesions are present and progress in childhood while the disease commonly remains silent by routine clinical measures. Early and timely diagnosis of Fabry nephropathy is crucial since late initiation of enzyme replacement therapy may not halt progressive renal dysfunction. This may be challenging due to difficulties in diagnosis of Fabry disease in children and absence of a sensitive non-invasive biomarker of early Fabry nephropathy. Accurate measurement of glomerular filtration rate and regular assessment for proteinuria and microalbuminuria are useful, though not sensitive enough to detect early lesions in the kidney. The principal clinical manifestations in Fabry disease consist of artery associated complications (such as cerebral disease and nephropathy), but the pathophysiology of this specific vasculopathy is unclear. Several studies indicate that the specific vascular lesions that are present in Fabry disease occur as a result of vascular dysfunction with major components being endothelial dysfunction, alterations in cerebral perfusion and a pro-thrombotic phenotype. Fabry cardiac involvement has several clinical manifestations (Table 10): concentric left ventricular hypertrophy without left ventricular dilation and severe loss of left ventricular systolic function, mitral and aortic valvulopathy, disorders of the atrioventricular conduction or repolarization, and compromised diastolic function. The neurological manifestations of Fabry disease include both peripheral nervous system and CNS involvement, with globotriaosylceramide accumulation found in Schwann cells and dorsal root ganglia together with deposits in CNS neurones. The main involvement of the CNS is attributable to cerebrovasculopathy, with an increased incidence of stroke. The abnormal neuronal accumulation of glycosphingolipid appears to have little clinical effect on the natural history of Fabry disease, with the possible exception of some reported mild cognitive abnormalities. The pathogenesis of Fabry vasculopathy remains poorly understood, but probably relates, in part, to abnormal functional control of the vessels, secondary to endothelial dysfunction as a consequence of ?-galactosidase A deficiency. The diagnosis of Fabry disease is made in hemizygous males after the detection of the presence of angiokeratomas (Fig. 19 A, B), irregularities in sweating, edema, scant body hair, painful sensations, and of cardiovascular, intestinal, renal, ophthalmologic, phlebologic, and respiratory involvement. A deficiency of alpha-gal A in serum, leukocytes, tears, tissue specimens, or cultured skin fibroblasts further supports the diagnosis in male patients. Since heterozygous women show angiokeratomas in only about 30% of cases and may have alpha-gal A levels within normal range, genetic analysis is recommended. The resultant storage of undegraded glycolipids leads to the progressive development of potentially life-threatening man

Tuttolomondo, Antonino; Pecoraro, Rosaria; Simonetta, Irene; Miceli, Salvatore; Pinto, Antonio; Licata, Giuseppe

2013-01-01

138

Anderson-Hynes dismembered pyeloplasty performed using the da Vinci robotic system  

Microsoft Academic Search

Introduction. To evaluate and describe the use of the da Vinci robotic system in performing laparoscopic Anderson-Hynes pyeloplasty.Technical Considerations. Between June 2001 and February 2002, 9 patients underwent laparoscopic Anderson-Hynes pyeloplasty with the da Vinci telerobotic surgical system. The diagnosis was based on the presenting symptoms and radiologic imaging findings. The technique for da Vinci-assisted Anderson-Hynes pyeloplasty followed the same

Matthew T Gettman; Richard Neururer; Georg Bartsch; Reinhard Peschel

2002-01-01

139

Extended recursion in operator space (EROS), a new impurity solver for the single impurity Anderson model  

SciTech Connect

We have developed a new efficient and accurate impurity solver for the single impurity Anderson model (SIAM), which is based on a non-perturbative recursion technique in a space of operators and involves expanding the self-energy as a continued fraction. The method has no special occupation number or temperature restrictions; the only approximation is the number of levels of the continued fraction retained in the expansion. We also show how this approach can be used as a new approach to Dynamical Mean Field Theory (DMTF) and illustrate this with the Hubbard model. The three lowest orders of recursion give the Hartree-Fock, Hubbard I, and Hubbard III approximations. A higher level of recursion is able to reproduce the expected 3-peak structure in the spectral function and Fermi liquid behavior.

Albers, Robert C [Los Alamos National Laboratory; Julien, Jean P [Los Alamos National Laboratory

2008-01-01

140

Evaluation of Phase II glass formulations for vitrification of Hanford Site low-level waste  

SciTech Connect

A vendor glass formulation study was carried out at Pacific Northwest Laboratory (PNL), supporting the Phase I and Phase II melter vendor testing activities for Westinghouse Hanford Company. This study is built upon the LLW glass optimization effort that will be described in a separate report. For Phase I vendor melter testing, six glass formulations were developed at PNL and additional were developed by Phase I vendors. All the doses were characterized in terms of viscosity and chemical durability by the 7-day Product Consistency Test. Twelve Phase II glass formulations (see Tables 3.5 and 3.6) were developed to accommodate 2.5 wt% P{sub 2}O{sub 5} and 1.0 wt% S0{sub 3} without significant processing problems. These levels of P{sub 2}O{sub 5} and SO{sub 3} are expected to be the highest possible concentrations from Hanford Site LLW streams at 25 wt% waste loading in glass. The Phase H compositions formulated were 6 to 23 times more durable than the environmental assessment (EA) glass. They melt within the temperature range of 1160{degrees} to 1410{degrees}C to suit different melting technologies. The composition types include boron-free for volatilization sensitive melters; boron-containing glasses for coId-cap melters; Zr-containing, glasses for enhanced Iong-term durability; and Fe-containing glasses for reducing melting temperature and melt volatility while maintaining chemical durability.

Feng, X.; Hrma, P.R.; Schweiger, M.J. [and others

1996-03-01

141

A characterization of the Anderson metal-insulator transport transition  

Microsoft Academic Search

We investigate the Anderson metal-insulator transition for random\\u000aSchrödinger operators. We define the strong insulator\\u000aregion to be the part of the spectrum where the random operator\\u000aexhibits strong dynamical localization in the Hilbert-Schmidt\\u000anorm. We introduce a local transport exponent ?(E) and set\\u000athe weak metallic transport region to be the part of the\\u000aspectrum with nontrivial transport (i.e.,

François Germinet; Abel Klein

142

Periodic Anderson model with electron-phonon correlated conduction band  

NASA Astrophysics Data System (ADS)

This Rapid Communication reports dynamical mean-field calculations for the periodic Anderson model in which the conduction band is coupled to phonons. Motivated in part by recent attention to the role of phonons in the ?-? transition in Ce, this model yields a rich and unexpected phase diagram which is of intrinsic interest. Specifically, above a critical value of the electron-phonon interaction, a first-order transition with two coexisting phases develops in the temperature-hybridization plane, which terminates at a second-order critical point. The coexisting phases display the familiar Kondo screened and local-moment character, yet they also exhibit pronounced polaronic and bipolaronic properties, respectively.

Zhang, Peng; Reis, Peter; Tam, Ka-Ming; Jarrell, Mark; Moreno, Juana; Assaad, Fakher; McMahan, A. K.

2013-03-01

143

Price-Anderson Nuclear Safety Enforcement Program. 1996 Annual report  

SciTech Connect

This first annual report on DOE`s Price Anderson Amendments Act enforcement program covers the activities, accomplishments, and planning for calendar year 1996. It also includes the infrastructure development activities of 1995. It encompasses the activities of the headquarters` Office of Enforcement in the Office of Environment, Safety and Health (EH) and Investigation and the coordinators and technical advisors in DOE`s Field and Program Offices and other EH Offices. This report includes an overview of the enforcement program; noncompliances, investigations, and enforcement actions; summary of significant enforcement actions; examples where enforcement action was deferred; and changes and improvements to the program.

NONE

1996-01-01

144

Electric dipolar susceptibility of the Anderson-Holstein model  

NASA Astrophysics Data System (ADS)

The temperature dependence of the electric dipolar susceptibility ?P is discussed on the basis of the Anderson-Holstein model with the use of a numerical renormalization group (NRG) technique. Note that ? P is related to the phonon Green's function D. In order to obtain a correct temperature dependence for ? P at low temperatures, we propose a method to evaluate ? P through the Dyson equation from the charge susceptibility ? c calculated by using the NRG instead of the direct NRG calculation of D. We find that the irreducible charge susceptibility estimated from ? c agree with the perturbation calculation, suggesting that our method works well.

Fuse, Takahiro; Hotta, Takashi

2013-06-01

145

Strong coupling to two-dimensional anderson localized modes.  

PubMed

We use a scattering formalism to derive a condition of strong coupling between a resonant scatterer and an Anderson localized mode for electromagnetic waves in two dimensions. The strong coupling regime is demonstrated based on exact numerical simulations, in perfect agreement with theory. The strong coupling threshold can be expressed in terms of the Thouless conductance and the Purcell factor. This connects key concepts in transport theory and cavity quantum electrodynamics, and provides a practical tool for the design or analysis of experiments. PMID:23952400

Cazé, A; Pierrat, R; Carminati, R

2013-07-31

146

Angiotensin II receptor blockade with valsartan decreases plasma osteopontin levels in patients with essential hypertension.  

PubMed

Osteopontin (OPN) has recently emerged as a key factor in both vascular remodelling and development of atherosclerosis. It has been reported that OPN is regulated by the renin-angiotensin-aldosterone system (RAAS). The aim of this study was to clarify the effect of angiotensin II receptor blockade with valsartan on plasma OPN levels in patients with essential hypertension (EHT). Forty-six patients (mean age, 64±11 years) with EHT were randomly assigned to treatment with amlodipine or valsartan. There were no significant differences in baseline clinical characteristics between the two groups. Blood sampling and blood pressure evaluation were performed before and after 24 weeks of treatment. After 24 weeks, both systolic blood pressure (SBP) and diastolic blood pressure (DBP) were decreased significantly and by the same degree in each treatment group. However, valsartan but not amlodipine decreased plasma OPN levels (baseline and 24-week data-valsartan: 614±224?ng?ml(-1), 472±268?ng?ml(-1), P=0.006; amlodipine: 680±151?ng?ml(-1), 687±234?ng?ml(-1), P>0.999). A positive correlation between the reduction in OPN and the log natural (ln) C-reactive protein (CRP) was seen in the valsartan-treated group. Stepwise regression analysis showed that treatment with valsartan and the reduction of ln CRP were associated with the reduction in OPN levels, and this association was independent of the reduction in SBP or aldosterone levels (valsartan: ?=0.332, P=0.026; ln CRP reduction: ?=0.366, P=0.015). These results suggest that suppression of the RAAS and inflammation may decrease plasma OPN levels. PMID:20664555

Kurata, M; Okura, T; Irita, J; Enomoto, D; Nagao, T; Jotoku, M; Miyoshi, K; Desilva, V R; Higaki, J

2010-07-22

147

Increased urotensin II plasma levels in patients with cirrhosis and portal hypertension  

Microsoft Academic Search

Background\\/Aims: Vasodilatation – despite activation of endogenous vasoconstrictors – is pronounced in portal hypertension. We therefore investigated the role of Urotensin II (U II), a newly described peptide reported to be a vasoconstrictor in the central arterial compartment and a vasodilator in the splanchnic vasculature.Methods: U II immunoreactivity was measured in 50 patients with cirrhosis and in 15 healthy controls.

Jörg Heller; Michael Schepke; Markus Neef; Rainer Woitas; Christian Rabe; Tilman Sauerbruch

2002-01-01

148

Nutritional Restriction and Levels of Muscle IGF-II MRNA in Channel Catfish  

Technology Transfer Automated Retrieval System (TEKTRAN)

The growth hormone-insulin like growth factor (GH-IGF) axis plays an important role in the endocrine control of fish growth. We have previously reported differential expression of insulin like growth factor-II (IGF-II) in faster growing channel catfish families, but IGF-II’s role during nutritional...

149

Influence of luminosity leveling on the CDF-II B-Physics program  

SciTech Connect

The effective bandwidth of the CDF-II level 1 trigger is approximately 25 kHz. Some of this bandwidth is used to record events that form the data sets used by the high p{sub T} physics analyses. The remaining bandwidth is used by triggers that are sensitive to hadronic B decays and provide one of the most important samples used for the study of B{sub s}{sup 0} mixing. At high luminosities, the hadronic B triggers have rates that greatly exceed the available bandwidth. Rather than incur large dead-times associated with these excessive rates, these B triggers are prescaled to limit the total trigger rate to the effective level 1 trigger bandwidth. The prescales are dynamically adjusted as the store progresses so that all of the bandwidth that is not used for the high p{sub T} physics program is used to record hadronic B triggers. In principle, the luminosity could be held at a more constant level throughout the store in such a way that the integrated luminosity would be the same as that obtained from a normal store. It has been suggested that this would allow B triggers to be recorded with lower prescales and consequently with higher B{sub s}{sup 0} signal efficiencies. This note describes a parametric model of the high p{sub T} and hadronic B triggers used by CDF and compares the yields of reconstructed B{sub s}{sup 0} decays that would result with and without luminosity leveling.

Jones, Matthew; /Purdue U.; Lewis, Jonathan; /Fermilab

2005-05-01

150

Visualization on supercomputing platform level II ASC milestone (3537-1B) results from Sandia.  

SciTech Connect

This report provides documentation for the completion of the Sandia portion of the ASC Level II Visualization on the platform milestone. This ASC Level II milestone is a joint milestone between Sandia National Laboratories and Los Alamos National Laboratories. This milestone contains functionality required for performing visualization directly on a supercomputing platform, which is necessary for peta-scale visualization. Sandia's contribution concerns in-situ visualization, running a visualization in tandem with a solver. Visualization and analysis of petascale data is limited by several factors which must be addressed as ACES delivers the Cielo platform. Two primary difficulties are: (1) Performance of interactive rendering, which is most computationally intensive portion of the visualization process. For terascale platforms, commodity clusters with graphics processors(GPUs) have been used for interactive rendering. For petascale platforms, visualization and rendering may be able to run efficiently on the supercomputer platform itself. (2) I/O bandwidth, which limits how much information can be written to disk. If we simply analyze the sparse information that is saved to disk we miss the opportunity to analyze the rich information produced every timestep by the simulation. For the first issue, we are pursuing in-situ analysis, in which simulations are coupled directly with analysis libraries at runtime. This milestone will evaluate the visualization and rendering performance of current and next generation supercomputers in contrast to GPU-based visualization clusters, and evaluate the performance of common analysis libraries coupled with the simulation that analyze and write data to disk during a running simulation. This milestone will explore, evaluate and advance the maturity level of these technologies and their applicability to problems of interest to the ASC program. Scientific simulation on parallel supercomputers is traditionally performed in four sequential steps: meshing, partitioning, solver, and visualization. Not all of these components are necessarily run on the supercomputer. In particular, the meshing and visualization typically happen on smaller but more interactive computing resources. However, the previous decade has seen a growth in both the need and ability to perform scalable parallel analysis, and this gives motivation for coupling the solver and visualization.

Geveci, Berk (Kitware, Inc., Clifton Park, NY); Fabian, Nathan; Marion, Patrick (Kitware, Inc., Clifton Park, NY); Moreland, Kenneth D.

2010-09-01

151

Chiral Condensate and Mott-Anderson Freeze-Out  

NASA Astrophysics Data System (ADS)

We present the idea of a Mott-Anderson freeze-out that suggests a key role of the localization of the hadron wave functions when traversing the hadronization transition. The extension of hadron wave functions in dense matter is governed by the behavior of the chiral quark condensate such that its melting at finite temperatures and chemical potentials entails an increase of the size of hadrons and thus their geometrical strong interaction cross sections. It is demonstrated within a schematic resonance gas model, that a kinetic freeze-out condition reveals a correlation with the reduction of the chiral condensate in the phase diagram up to 50% of its vacuum value. Generalizing the description of the chiral condensate by taking into account a full hadron resonance gas such correlation gets distorted. We discuss, that this may be due to our approximations in calculating the chiral condensate which disregard both, in-medium effects on hadron masses and hadron-hadron interactions. The latter, in particular due to quark exchange reactions, could lead to a delocalization of the hadron wave functions in accordance with the picture of a Mott-Anderson transition.

Blaschke, D.; Berdermann, J.; Cleymans, J.; Redlich, K.

2012-07-01

152

Ferromagnetism in the two-dimensional periodic Anderson model  

SciTech Connect

Using the constrained-path Monte Carlo method, we studied the magnetic properties of the two-dimensional periodic Anderson model for electron fillings between 1/4 and 1/2. We also derived two effective low-energy theories to assist in interpreting the numerical results. For 1/4 filling, we found that the system can be a Mott or a charge-transfer insulator, depending on the relative values of the Coulomb interaction and the charge-transfer gap between the two noninteracting bands. The insulator may be a paramagnet or antiferromagnet. We concentrated on the effect of electron doping on these insulating phases. Upon doping we obtained a partially saturated ferromagnetic phase for low concentrations of conduction electrons. If the system were a charge-transfer insulator, we would find that the ferromagnetism is induced by the well-known Ruderman-Kittel-Kasuya-Yosida interaction. However, we found a novel correlated hopping mechanism inducing the ferromagnetism in the region where the nondoped system is a Mott insulator. Our regions of ferromagnetism spanned a much smaller doping range than suggested by recent slave boson and dynamical mean-field theory calculations, but they were consistent with that obtained by density-matrix renormalization group calculations of the one-dimensional periodic Anderson model.

Batista, C. D.; Bonca, J.; Gubernatis, J. E.

2001-05-01

153

When should cardiologists suspect Anderson-Fabry disease?  

PubMed

Anderson-Fabry disease is a lysosomal storage disorder caused by ?-galactosidase defects and progressive intracellular accumulation of globotriaosylceramide. The disease can be specifically treated with enzyme replacement therapy. Hemizygous men and heterozygous women can develop cardiac disease. Whereas men experience the most severe clinical phenotype, clinical presentation in women varies from asymptomatic to severely symptomatic. The characteristic cardiac phenotype is left ventricular hypertrophy mimicking sarcomeric hypertrophic cardiomyopathy or hypertensive heart disease. Early or prehypertrophy cardiac involvement may escape detection, unless electrocardiographic clues are present. The cardiac markers that raise suspicion of Anderson-Fabry disease include a short PR interval without a ? wave and a prolonged QRS interval, supraventricular and ventricular arrhythmias, and concentric left ventricular hypertrophy. Extracardiac features include renal failure, corneal deposits, and nervous, gastrointestinal, and cutaneous manifestations. Useful family data include cardiac and extracardiac traits in relatives and absence of male-to-male transmission. Symptoms are subtle, and the interval between the onset of symptoms and diagnosis may be as long as 20 years. As such, the diagnosis is typically late. Endomyocardial biopsy shows optically empty myocytes on light microscopy and dense osmiophilic bodies constituted of globotriaosylceramide on electron microscopy. Alpha-galactosidase A activity is reduced in hemizygous men but not in heterozygous women. Genetic testing is the gold standard for the diagnosis. In conclusion, a correct and timely diagnosis offers the possibility of disease-specific treatment that leads to sustained clinical benefits for cardiac and noncardiac signs and symptoms. PMID:21059442

Gambarin, Fabiana I; Disabella, Eliana; Narula, Jagat; Diegoli, Marta; Grasso, Maurizia; Serio, Alessandra; Favalli, B M E Valentina; Agozzino, Manuela; Tavazzi, Luigi; Fraser, Alan G; Arbustini, Eloisa

2010-11-15

154

Applying the Anderson-Darling Test to Suicide Clusters.  

PubMed

Background: Suicide clusters at Cornell University and the Massachusetts Institute of Technology (MIT) prompted popular and expert speculation of suicide contagion. However, some clustering is to be expected in any random process. Aim: This work tested whether suicide clusters at these two universities differed significantly from those expected under a homogeneous Poisson process, in which suicides occur randomly and independently of one another. Method: Suicide dates were collected for MIT and Cornell for 1990-2012. The Anderson-Darling statistic was used to test the goodness-of-fit of the intervals between suicides to distribution expected under the Poisson process. Results: Suicides at MIT were consistent with the homogeneous Poisson process, while those at Cornell showed clustering inconsistent with such a process (p = .05). Conclusions: The Anderson-Darling test provides a statistically powerful means to identify suicide clustering in small samples. Practitioners can use this method to test for clustering in relevant communities. The difference in clustering behavior between the two institutions suggests that more institutions should be studied to determine the prevalence of suicide clustering in universities and its causes. PMID:23502060

Mackenzie, Donald W

2013-03-15

155

Spectrum and energy levels of singly ionized cesium. II. Interpretation of fine and hyperfine structures  

SciTech Connect

The theoretical interpretation of Cs II has been extended and now includes the 5p/sup 5/ns (n = 6--12), 5p/sup 5/np (n = 6--8), 5p/sup 5/nd (n = 5--11), 5p/sup 5/nf (n = 4--8), 5p/sup 5/ng (n = 5--10), and 5p/sup 5/nh (n = 6--8) configurations. Most levels are well represented in the single-configuration approximation when far configuration interactions are included through effective electrostatic parameters. Explicit interactions of low-lying 5p/sup 5/nd+5p/sup 5/(n+1)s configurations have been determined. For most configurations, good jK coupling is found. Purities of the levels in jK coupling and the LS composition of the eigenvectors are given. The intermediate-coupling eigenvectors have been used to calculate magnetic-dipole hyperfine-splitting factors, and these are compared with 167 experimentally determined values from our earlier work.

Sansonetti, C.J.; Andrew, K.L.; Wyart, J.

1988-10-01

156

Hubbard physics in the symmetric half-filled periodic anderson-hubbard model  

NASA Astrophysics Data System (ADS)

Two very different methods — exact diagonalization on finite chains and a variational method — are used to study the possibility of a metal-insulator transition in the symmetric half-filled periodic Anderson-Hubbard model. With this aim we calculate the density of doubly occupied d sites ( gn d ) as a function of various parameters. In the absence of on-site Coulomb interaction ( U f ) between f electrons, the two methods yield similar results. The double occupancy of d levels remains always finite just as in the one-dimensional Hubbard model. Exact diagonalization on finite chains gives the same result for finite U f , while the Gutzwiller method leads to a Brinkman-Rice transition at a critical value ( U {/d c }), which depends on U f and V.

Hagymási, I.; Itai, K.; Sólyom, J.

2013-05-01

157

Mean-field theories for disordered electrons: Diffusion pole and Anderson localization  

NASA Astrophysics Data System (ADS)

We discuss conditions to be put on mean-field-like theories to be able to describe fundamental physical phenomena in disordered electron systems. In particular, we investigate options for a consistent mean-field theory of electron localization and for a reliable description of transport properties. We argue that a mean-field theory for the Anderson localization transition must be electron-hole symmetric and self-consistent at the two-particle (vertex) level. We show that such a theory with local equations can be derived from the asymptotic limit to high spatial dimensions. The weight of the diffusion pole, i.e., the number of diffusive states at the Fermi energy, in this mean-field theory decreases with the increasing disorder strength and vanishes in the localized phase. Consequences of the disclosed behavior for our understanding of vanishing of electron diffusion are discussed.

Janiš, V.; Koloren?, J.

2005-06-01

158

Fotoemissao no modelo de Anderson para compostos de terras-raras com valencia flutuante. (Photoemission in the Anderson model for rare earth compounds with floating valences).  

National Technical Information Service (NTIS)

X-ray photoemission spectra (XPS) are calculated for the spin-degenerate Anderson model of valence fluctuation compounds. Based on the renormalization group technique originally introduced by Wilson to calculate the magnetic susceptibility for the Kondo m...

H. O. Frota

1985-01-01

159

Common polymorphism in H19 associated with birthweight and cord blood IGF-II levels in humans  

PubMed Central

Background Common genetic variation at genes that are imprinted and exclusively maternally expressed could explain the apparent maternal-specific inheritance of low birthweight reported in large family pedigrees. We identified ten single nucleotide polymorphisms (SNPs) in H19, and we genotyped three of these SNPs in families from the contemporary ALSPAC UK birth cohort (1,696 children, 822 mothers and 661 fathers) in order to explore associations with size at birth and cord blood IGF-II levels. Results Both offspring's and mother's H19 2992C>T SNP genotypes showed associations with offspring birthweight (P = 0.03 to P = 0.003) and mother's genotype was also associated with cord blood IGF-II levels (P = 0.0003 to P = 0.0001). The offspring genotype association with birthweight was independent of mother's genotype (P = 0.01 to P = 0.007). However, mother's untransmitted H19 2992T allele was also associated with larger birthweight (P = 0.04) and higher cord blood IGF-II levels (P = 0.002), suggesting a direct effect of mother's genotype on placental IGF-II expression and fetal growth. The association between mother's untransmitted allele and cord blood IGF-II levels was more apparent in offspring of first pregnancies than subsequent pregnancies (P-interaction = 0.03). Study of the independent Cambridge birth cohort with available DNA in mothers (N = 646) provided additional support for mother's H19 2992 genotype associations with birthweight (P = 0.04) and with mother's glucose levels (P = 0.01) in first pregnancies. Conclusion The common H19 2992T allele, in the mother or offspring or both, may confer reduced fetal growth restraint, as indicated by associations with larger offspring birth size, higher cord blood IGF-II levels, and lower compensatory early postnatal catch-up weight gain, that are more evident among mother's smaller first-born infants.

Petry, Clive J; Ong, Ken K; Barratt, Bryan J; Wingate, Diane; Cordell, Heather J; Ring, Susan M; Pembrey, Marcus E; Reik, Wolf; Todd, John A; Dunger, David B

2005-01-01

160

Award for Distinguished Scientific Early Career Contributions to Psychology: Adam K. Anderson  

ERIC Educational Resources Information Center

|Adam K. Anderson, recipient of the Award for Distinguished Scientific Early Career Contributions to Psychology, is cited for his outstanding contribution to understanding the representation of emotion and its influence on cognition. By combining psychological and neuroscience techniques with rigorous and creative experimental designs, Anderson

American Psychologist, 2009

2009-01-01

161

Anderson localization of a non-interacting Bose-Einstein condensate  

Microsoft Academic Search

Anderson localization of waves in disordered media was originally predicted fifty years ago, in the context of transport of electrons in crystals. The phenomenon is much more general and has been observed in a variety of systems, including light waves. However, Anderson localization has not been observed directly for matter waves. Owing to the high degree of control over most

Giacomo Roati; Chiara D'Errico; Leonardo Fallani; Marco Fattori; Chiara Fort; Matteo Zaccanti; Giovanni Modugno; Michele Modugno; Massimo Inguscio

2008-01-01

162

Carl V. Anderson oral history interview by Michael Hirsh, September 10, 2008  

Microsoft Academic Search

This is an oral history interviewer with Holocaust concentration camp liberator Carl V. Anderson. Anderson was a sergeant in the 63rd Infantry Division when it liberated Landsberg on April 29, 1945. The division arrived in France in December 1944 and fought in the Battle of the Bulge before proceeding on the Central Europe Campaign. They encountered Landsberg while en route

Carl V. Anderson; Michael Hirsh

2008-01-01

163

Melinda's Closet: Trauma and the Queer Subtext of Laurie Halse Anderson's Speak  

Microsoft Academic Search

Speak, Laurie Halse Anderson’s Michael L. Printz Honor Book, can be read as a coming-out story. The novel tells the story of Melinda Sordino, who, during the summer before her freshman year in high school, is raped at a party by an older boy who goes to the same school Melinda will attend in the fall. After the attack, Melinda,

Don Latham

2007-01-01

164

Comment on Anderson and Cuneo's "The Height + Width Rule in Children's Judgments of Quantity."  

ERIC Educational Resources Information Center

|Bogartz questions the Anderson and Cuneo study (p335-78 of this issue) on statistical-methodological grounds and on their positions concerning the concepts of conservation, centration, and compensation. (For Anderson and Cuneo's rejoinder to Bogartz, see p388-92 of this journal issue.) (SJL)|

Bogartz, Richard S.

1978-01-01

165

78 FR 41835 - Inflation Adjustments to the Price-Anderson Act Financial Protection Regulations  

Federal Register 2010, 2011, 2012, 2013

...NRC-2013-0072] RIN 3150-AJ25 Inflation Adjustments to the Price-Anderson Act...specified in the Price-Anderson Act for inflation at least once during each 5-year period...70 FR 61885), and the first periodic inflation adjustments on September 29,...

2013-07-12

166

Radiative lifetimes, branching fractions, transition probabilities and oscillator strengths of even-parity levels for Eu II  

NASA Astrophysics Data System (ADS)

Radiative lifetimes for 30 even-parity levels in the 4f65d6s, 4f65d2 and 4f8 configurations with the energy range between 34923.43 and 57388.87 cm-1 of Eu II were measured by time-resolved laser-induced fluorescence (TR-LIF) method. Branching fraction measurements of seven levels for Eu II were performed based on the emission spectrum of a hollow cathode lamp. By combining the measured lifetimes and the branching fractions, absolute transition probabilities and oscillator strengths for 18 transitions were derived. The obtained results were compared with published data, and a basically good agreement was achieved.

Wang, Qian; Shang, Xue; Tian, Yanshan; Fan, Shuang; Dai, Zhenwen

2013-11-01

167

Electronic properties and pinning of the Fermi level in irradiated II-IV-V{sub 2} semiconductors  

SciTech Connect

Experimental data on the electronic properties of II-IV-V{sub 2} semiconductors irradiated with high-energy particles (electrons, protons, and neutrons) are reported. The limiting electrical characteristics of irradiated ternary compounds are evaluated and compared with the corresponding data for the binary III-V analogues of the compounds. Particular emphasis is placed on the determination of the limiting position of the Fermi level, F{sub lim}, in irradiated II-IV-V{sub 2} compounds. The results of calculations of the energy position of the intrinsic charge-neutrality level are presented.

Brudnyi, V. N., E-mail: brudnyi@mail.tsu.ru [Tomsk State University (Russian Federation)

2009-09-15

168

Radiative lifetimes, branching fractions, transition probabilities and oscillator strengths of even-parity levels for Eu II  

NASA Astrophysics Data System (ADS)

Radiative lifetimes for 30 even-parity levels in the 4f65d6s, 4f65d2 and 4f8 configurations with the energy range between 34923.43 and 57388.87 cm-1 of Eu II were measured by time-resolved laser-induced fluorescence (TR-LIF) method. Branching fraction measurements of seven levels for Eu II were performed based on the emission spectrum of a hollow cathode lamp. By combining the measured lifetimes and the branching fractions, absolute transition probabilities and oscillator strengths for 18 transitions were derived. The obtained results were compared with published data, and a basically good agreement was achieved.

Wang, Qian; Shang, Xue; Tian, Yanshan; Fan, Shuang; Dai, Zhenwen

2013-09-01

169

?????????? ??? ?????? ?????????? ????????????: ????????? II ??????? ??????? ?? ????  

Microsoft Academic Search

The article discusses the image of Catherine II in the context of the French anti-monarchist pamphlets that abounded after the French revolution and were often directed at the Russian empress as well, representing her as the “Semiramis of the North”. A special case is Marquis de Sade?s Histoire de Juliette, ou les Prospérités du vice, which unmistakably refers to Catherine

Alexandre Stroev

2011-01-01

170

Critical Behavior at the Mott-Anderson Transition: A Typical-Medium Theory Perspective  

NASA Astrophysics Data System (ADS)

We present a detailed analysis of the critical behavior close to the Mott-Anderson transition. Our findings are based on a combination of numerical and analytical results obtained within the framework of typical-medium theory—the simplest extension of dynamical mean field theory capable of incorporating Anderson localization effects. By making use of previous scaling studies of Anderson impurity models close to the metal-insulator transition, we solve this problem analytically and reveal the dependence of the critical behavior on the particle-hole symmetry. Our main result is that, for sufficiently strong disorder, the Mott-Anderson transition is characterized by a precisely defined two-fluid behavior, in which only a fraction of the electrons undergo a “site selective” Mott localization; the rest become Anderson-localized quasiparticles.

Aguiar, M. C. O.; Dobrosavljevi?, V.; Abrahams, E.; Kotliar, G.

2009-04-01

171

Critical behavior at the mott-anderson transition: a typical-medium theory perspective.  

PubMed

We present a detailed analysis of the critical behavior close to the Mott-Anderson transition. Our findings are based on a combination of numerical and analytical results obtained within the framework of typical-medium theory-the simplest extension of dynamical mean field theory capable of incorporating Anderson localization effects. By making use of previous scaling studies of Anderson impurity models close to the metal-insulator transition, we solve this problem analytically and reveal the dependence of the critical behavior on the particle-hole symmetry. Our main result is that, for sufficiently strong disorder, the Mott-Anderson transition is characterized by a precisely defined two-fluid behavior, in which only a fraction of the electrons undergo a "site selective" Mott localization; the rest become Anderson-localized quasiparticles. PMID:19518658

Aguiar, M C O; Dobrosavljevi?, V; Abrahams, E; Kotliar, G

2009-04-16

172

Diagnostics of diapycnal diffusion in z-level ocean models. Part II: 3-Dimensional OGCM  

NASA Astrophysics Data System (ADS)

We present a robust method for diagnosing total diapycnal diffusivities, i.e. explicitly applied plus numerically induced diffusivities, from tracer release experiments in numerical z-level models. To this extent, numerical experiments differing only in the advection scheme used (CTRD using 2nd order centred differences, UPWIND using the upwind/upstream advection scheme, QUICK using the quicker advection scheme after Farrow and Stevens (1995) and FCT after Gerdes et al. (1991)) are analysed and compared. To obtain regionally resolved estimates of diapycnal diffusivities, individual inert dye tracers are released in dynamically different regions of a North Atlantic model, namely (i) in the interior of the subtropical gyre and (ii) in the western boundary current. Diagnosed diffusivities are robust with respect to changes in temporal and spatial sampling of the simulated dye tracer for both advection schemes and for both regions. The numerically induced diffusivity is generally positive, but can become negative for centred differences advection numerics after several months of simulated tracer dispersion.

Getzlaff, Julia; Nurser, George; Oschlies, Andreas

173

Reconstructing Northern Hemisphere upper-level fields during World War II  

NASA Astrophysics Data System (ADS)

Monthly mean fields of temperature and geopotential height (GPH) from 700 to 100 hPa were statistically reconstructed for the extratropical Northern Hemisphere for the World War II period. The reconstruction was based on several hundred predictor variables, comprising temperature series from meteorological stations and gridded sea level pressure data (1939-1947) as well as a large amount of historical upper-air data (1939-1944). Statistical models were fitted in a calibration period (1948-1994) using the NCEP/NCAR Reanalysis data set as predictand. The procedure consists of a weighting scheme, principal component analyses on both the predictor variables and the predictand fields and multiple regression models relating the two sets of principal component time series to each other. According to validation experiments, the reconstruction skill in the 1939-1944 period is excellent for GPH at all levels and good for temperature up to 500 hPa, but somewhat worse for 300 hPa temperature and clearly worse for 100 hPa temperature. Regionally, high predictive skill is found over the midlatitudes of Europe and North America, but a lower quality over Asia, the subtropics, and the Arctic. Moreover, the quality is considerably better in winter than in summer. In the 1945-1947 period, reconstructions are useful up to 300 hPa for GPH and, in winter, up to 500 hPa for temperature. The reconstructed fields are presented for selected months and analysed from a dynamical perspective. It is demonstrated that the reconstructions provide a useful tool for the analysis of large-scale circulation features as well as stratosphere-troposphere coupling in the late 1930s and early 1940s.

Brönnimann, S.; Luterbacher, J.

174

Transport across an Anderson quantum dot in the intermediate coupling regime  

NASA Astrophysics Data System (ADS)

We describe linear and nonlinear transport across a strongly interacting single impurity Anderson model quantum dot with intermediate coupling to the leads, i.e. with tunnel coupling ? of the order of the thermal energy kBT. The coupling is large enough that sequential tunneling processes (second order in the tunneling Hamiltonian) alone do not suffice to properly describe the transport characteristics. Upon applying a density matrix approach, the current is expressed in terms of rates obtained by considering a very small class of diagrams which dress the sequential tunneling processes by charge fluctuations. We call this the "dressed second order" (DSO) approximation. One advantage of the DSO is that, still in the Coulomb blockade regime, it can describe the crossover from thermally broadened to tunneling broadened conductance peaks. When the temperature is decreased even further (kBT < ?), the DSO captures Kondesque behaviours of the Anderson quantum dot qualitatively: we find a zero bias anomaly of the differential conductance versus applied bias, an enhancement of the conductance with decreasing temperature as well as universality of the shape of the conductance as function of the temperature. We can without complications address the case of a spin degenerate level split energetically by a magnetic field. In case spin dependent chemical potentials are assumed and only one of the four chemical potentials is varied, the DSO yields in principle only one resonance. This seems to be in agreement with experiments with pseudo spin [U. Wilhelm, J. Schmid, J. Weis, K.V. Klitzing, Physica E 14, 385 (2002)]. Furthermore, we get qualitative agreement with experimental data showing a cross-over from the Kondo to the empty orbital regime.

Kern, Johannes; Grifoni, Milena

2013-09-01

175

Three-Dimensional Anderson Localization in Variable Scale Disorder  

NASA Astrophysics Data System (ADS)

We report on the impact of variable-scale disorder on 3D Anderson localization of a noninteracting ultracold atomic gas. A spin-polarized gas of fermionic atoms is localized by allowing it to expand in an optical speckle potential. Using a sudden quench of the localized density distribution, we verify that the density profile is representative of the underlying single-particle localized states. The geometric mean of the disordering potential correlation lengths is varied by a factor of 4 via adjusting the aperture of the speckle focusing lens. We observe that the root-mean-square size of the localized gas increases approximately linearly with the speckle correlation length, in qualitative agreement with the scaling predicted by weak scattering theory.

McGehee, W. R.; Kondov, S. S.; Xu, W.; Zirbel, J. J.; DeMarco, B.

2013-10-01

176

Price-Anderson Nuclear Safety Enforcement Program. 1997 annual report  

SciTech Connect

This report summarizes activities in the Department of Energy's Price-Anderson Amendments Act (PAAA) Enforcement Program in calendar year 1997 and highlights improvements planned for 1998. The DOE Enforcement Program involves the Office of Enforcement and Investigation in the DOE Headquarters Office of Environment, Safety and Health, as well as numerous PAAA Coordinators and technical advisors in DOE Field and Program Offices. The DOE Enforcement Program issued 13 Notices of Violation (NOV`s) in 1997 for cases involving significant or potentially significant nuclear safety violations. Six of these included civil penalties totaling $440,000. Highlights of these actions include: (1) Brookhaven National Laboratory Radiological Control Violations / Associated Universities, Inc.; (2) Bioassay Program Violations at Mound / EG and G, Inc.; (3) Savannah River Crane Operator Uptake / Westinghouse Savannah River Company; (4) Waste Calciner Worker Uptake / Lockheed-Martin Idaho Technologies Company; and (5) Reactor Scram and Records Destruction at Sandia / Sandia Corporation (Lockheed-Martin).

NONE

1998-01-01

177

Topology, Delocalization via Average Symmetry and the Symplectic Anderson Transition  

NASA Astrophysics Data System (ADS)

A field theory of the Anderson transition in two dimensional disordered systems with spin-orbit interactions and time-reversal symmetry is developed, in which localization is driven by the proliferation of vortex-like topological defects. The sign of the vortex fugacity determines the Z2 topological class of the localized phase. There are two distinct fixed points with the same critical exponents, corresponding to transitions from a metal to an insulator and a topological insulator respectively. The critical conductivity and correlation length exponent of these transitions are computed in a N=1-? expansion in the number of replicas, where for small ? the critical points are perturbatively connected to the Kosterlitz Thouless critical point. Delocalized states, which arise at the surface of weak topological insulators and topological crystalline insulators, occur because vortex proliferation is forbidden due to the presence of symmetries that are violated by disorder, but are restored by disorder averaging.

Kane, Charles; Fu, Liang

2013-03-01

178

Topology, delocalization via average symmetry and the symplectic Anderson transition.  

PubMed

A field theory of the Anderson transition in two-dimensional disordered systems with spin-orbit interactions and time-reversal symmetry is developed, in which the proliferation of vortexlike topological defects is essential for localization. The sign of vortex fugacity determines the Z(2) topological class of the localized phase. There are two distinct fixed points with the same critical exponents, corresponding to transitions from a metal to an insulator and a topological insulator, respectively. The critical conductivity and correlation length exponent of these transitions are computed in an N=1-[symbol: see text] expansion in the number of replicas, where for small [symbol: see text] the critical points are perturbatively connected to the Kosterlitz-Thouless critical point. Delocalized states, which arise at the surface of weak topological insulators and topological crystalline insulators, occur because vortex proliferation is forbidden due to the presence of symmetries that are violated by disorder, but are restored by disorder averaging. PMID:23368359

Fu, Liang; Kane, C L

2012-12-14

179

Three-dimensional anderson localization in variable scale disorder.  

PubMed

We report on the impact of variable-scale disorder on 3D Anderson localization of a noninteracting ultracold atomic gas. A spin-polarized gas of fermionic atoms is localized by allowing it to expand in an optical speckle potential. Using a sudden quench of the localized density distribution, we verify that the density profile is representative of the underlying single-particle localized states. The geometric mean of the disordering potential correlation lengths is varied by a factor of 4 via adjusting the aperture of the speckle focusing lens. We observe that the root-mean-square size of the localized gas increases approximately linearly with the speckle correlation length, in qualitative agreement with the scaling predicted by weak scattering theory. PMID:24138250

McGehee, W R; Kondov, S S; Xu, W; Zirbel, J J; Demarco, B

2013-10-02

180

Non-conventional Anderson localization in bilayered structures  

NASA Astrophysics Data System (ADS)

We resolve the problem of non-conventional Anderson localization emerging in bilayered periodic-on-average structures with alternating layers of materials with positive and negative refraction indices. Recently, it was numerically discovered that in such structures with weak fluctuations of refractive indices, the localization length Lloc can be enormously large for small wave frequencies ?. Within a new approach allowing us to go beyond the second order of perturbation theory, we derive the expression for Lloc valid for any ? and small variance of disorder, ?2Lt1. In the limit ??0 one gets a quite specific dependence, L-1loc~?4?8. Our approach allows one to establish the conditions under which this effect occurs.

Torres-Herrera, E. J.; Izrailev, F. M.; Makarov, N. M.

2012-04-01

181

Regulation of Synaptic Connectivity: Levels of Fasciclin II Influence Synaptic Growth in the Drosophila CNS  

Microsoft Academic Search

Much of our understanding of synaptogenesis comes from studies that deal with the development of the neuromuscular junction (NMJ). Although well studied, it is not clear how far the NMJ represents an adequate model for the formation of syn- apses within the CNS. Here we investigate the role of Fasciclin II (Fas II) in the development of synapses between identified

Richard A. Baines; Laurent Seugnet; Annemarie Thompson; Paul M. Salvaterra; Michael Bate

2002-01-01

182

AH-64D Apache Longbow/Video from UAS for Interoperability Teaming Level II (VUIT-2) Aircrew Workload Assessment.  

National Technical Information Service (NTIS)

An AH-64D/Unmanned Aerial System (UAS) aircrew workload assessment was conducted during February 2008 in Huntsville, AL. The purpose of the assessment was to evaluate AH-64D aircrew workload during UAS level II interoperability under simulated mission con...

B. Sperling D. B. Durbin J. S. Hicks

2009-01-01

183

Management of High Blood Cholesterol Levels in Nova Scotian Adults: Comparison With the NCEP II and European Clinical Practice Guidelines  

Microsoft Academic Search

Objective: To compare the prevalence of dietary and drug treatment for high blood cholesterol levels with indication for treatment according to the National Cholesterol Education Program (NCEP) II and European clinical practice guidelines. Study Design: A population-based, cross-sectional study. Patients and Methods: Data were from the 1995 Nova Scotia Health Survey. Patients were 2078 respondents aged 20 to 74 years

George Kephart; Ingrid Sketris; David MacLean; Kadre Kass; Seema Nagpal

184

Fire Fighter Level I-II-III [and] Practical Skills Test. Wisconsin Fire Service Certification Series. Final Revision.  

ERIC Educational Resources Information Center

Practical skills tests are provided for fire fighter trainees in the Wisconsin Fire Service Certification Series, Fire Fighter Levels I, II, and III. A course introduction appears first and contains this information: recommended instructional sequence, required facilities, instructional methodology, requirements for certification, course…

Pribyl, Paul F.

185

Comprehensive Study of Educational Technology Programs Authorized from 1989-1992. Volume II: Model Technology Schools, Level I.  

ERIC Educational Resources Information Center

This report, the second in a series of six, presents the findings of evaluative studies of six Level I Model Technology School sites which were conducted as part of Phase II of the California Educational Technology Assessment Program. The project sites are: Alhambra City School District (two schools); Cupertino Union Elementary District and…

Far West Lab. for Educational Research and Development, San Francisco, CA.

186

Effects of pravastatin sodium and simvastatin on plasma fibrinogen level and blood rheology in type II hyperlipoproteinemia  

Microsoft Academic Search

Elevated plasma fibrinogen level is known to progress atherosclerosis and to be one of the risk factors for the occurrence of cardiovascular diseases. The objective of this study is to evaluate the changes in plasma fibrinogen level and blood rheology in patients with type II hyperlipoproteinemia before and after random administrations of HMG-CoA (3-hydroxy-3-methylglutaryl-cocarboxylase-A) reductase inhibitors, pravastatin sodium and simvastatin,

Yoshiyasu Tsuda; Kiyoto Satoh; Masaya Kitadai; Tsutomu Takahashi; Yoshinari Izumi; Naohisa Hosomi

1996-01-01

187

Inhibition of biliverdin reductase increases ANG II-dependent superoxide levels in cultured renal tubular epithelial cells  

PubMed Central

Induction of heme oxygenase-1 (HO-1) in the renal medulla increases carbon monoxide and bilirubin production and decreases ANG II-mediated superoxide production. The goal of this study was to determine the importance of increases in bilirubin to the antioxidant effects of HO-1 induction in cultured mouse thick ascending loop of Henle (TALH) and inner medullary collecting duct (IMCD3) cells. Bilirubin levels were decreased by using small interfering RNAs (siRNAs) targeted to biliverdin reductase (BVR), which is the cellular enzyme responsible for the conversion of biliverdin to bilirubin. Treatment of cultured TALH or IMCD-3 cells with BVR siRNA (50 or 100 nM) resulted in an 80% decrease in the level of BVR protein and decreased cellular bilirubin levels from 46 ± 5 to 23 ± 4 nM (n = 4). We then determined the effects of inhibition of BVR on ANG II-mediated superoxide production. Superoxide production induced by ANG II (10?9 M) significantly increased in both TALH and IMCD-3 cells. Treatment of TALH cells with BVR siRNA resulted in a significant increase in ouabain-sensitive rubidium uptake from 95 ± 6 to 122 ± 5% control (n = 4, P < 0.05). Lastly, inhibition of BVR with siRNA did not prevent the decrease in superoxide levels observed in cells pretreated with the HO-1 inducer, hemin. We conclude that decreased levels of cellular bilirubin increase ANG II-mediated superoxide production and sodium transport; however, increases in bilirubin are not necessary for HO-1 induction to attenuate ANG II-mediated superoxide production.

Young, Shelby C.; Storm, Megan V.; Speed, Joshua S.; Kelsen, Silvia; Tiller, Chelsea V.; Vera, Trinity; Drummond, Heather A.

2009-01-01

188

Apolipoprotein A-II Influences Apolipoprotein E-Linked Cardiovascular Disease Risk in Women with High Levels of HDL Cholesterol and C-Reactive Protein  

PubMed Central

Background In a previous report by our group, high levels of apolipoprotein E (apoE) were demonstrated to be associated with risk of incident cardiovascular disease in women with high levels of C-reactive protein (CRP) in the setting of both low (designated as HR1 subjects) and high (designated as HR2 subjects) levels of high-density lipoprotein cholesterol (HDL-C). To assess whether apolipoprotein A-II (apoA-II) plays a role in apoE-associated risk in the two female groups. Methodology/Principal Outcome event mapping, a graphical data exploratory tool; Cox proportional hazards multivariable regression; and curve-fitting modeling were used to examine apoA-II influence on apoE-associated risk focusing on HDL particles with apolipoprotein A-I (apoA-I) without apoA-II (LpA-I) and HDL particles with both apoA-I and apoA-II (LpA-I:A-II). Results of outcome mappings as a function of apoE levels and the ratio of apoA-II to apoA-I revealed within each of the two populations, a high-risk subgroup characterized in each situation by high levels of apoE and additionally: in HR1, by a low value of the apoA-II/apoA-I ratio; and in HR2, by a moderate value of the apoA-II/apoA-I ratio. Furthermore, derived estimates of LpA-I and LpA-I:A-II levels revealed for high-risk versus remaining subjects: in HR1, higher levels of LpA-I and lower levels of LpA-I:A-II; and in HR2 the reverse, lower levels of LpA-I and higher levels of LpA-I:A-II. Results of multivariable risk modeling as a function of LpA-I and LpA-I:A-II (dichotomized as highest quartile versus combined three lower quartiles) revealed association of risk only for high levels of LpA-I:A-II in the HR2 subgroup (hazard ratio 5.31, 95% CI 1.12–25.17, p?=?0.036). Furthermore, high LpA-I:A-II levels interacted with high apoE levels in establishing subgroup risk. Conclusions/Significance We conclude that apoA-II plays a significant role in apoE-associated risk of incident CVD in women with high levels of HDL-C and CRP.

Corsetti, James P.; Bakker, Stephan J. L.; Sparks, Charles E.; Dullaart, Robin P. F.

2012-01-01

189

Mean-field theory of Anderson localization: Asymptotic solution in high spatial dimensions  

NASA Astrophysics Data System (ADS)

The Anderson model of noninteracting disordered electrons is studied in high spatial dimensions. We find that off-diagonal one- and two-particle propagators behave as Gaussian random variables with respect to momentum summations. With this simplification and with the electron-hole symmetry we reduce the parquet equations for two-particle irreducible vertices to a single algebraic equation for a local vertex. We find a disorder-driven bifurcation point in this equation signaling vanishing of diffusion and onset of Anderson localization. There is no bifurcation in d=1,2 where all states are localized. A natural order parameter for Anderson localization emerges from the construction.

Janiš, V.; Koloren?, J.

2005-01-01

190

Routes Towards Anderson-Like Localization of Bose-Einstein Condensates in Disordered Optical Lattices  

SciTech Connect

We investigate, both experimentally and theoretically, possible routes towards Anderson-like localization of Bose-Einstein condensates in disordered potentials. The dependence of this quantum interference effect on the nonlinear interactions and the shape of the disorder potential is investigated. Experiments with an optical lattice and a superimposed disordered potential reveal the lack of Anderson localization. A theoretical analysis shows that this absence is due to the large length scale of the disorder potential as well as its screening by the nonlinear interactions. Further analysis shows that incommensurable superlattices should allow for the observation of the crossover from the nonlinear screening regime to the Anderson localized case within realistic experimental parameters.

Schulte, T.; Drenkelforth, S.; Kruse, J.; Ertmer, W.; Arlt, J. [Institut fuer Quantenoptik, Universitaet Hannover, Welfengarten 1, D-30167 Hannover (Germany); Sacha, K.; Zakrzewski, J. [Instytut Fizyki Mariana Smoluchowskiego, Uniwersytet Jagiellonski, PL-30-059 Cracow (Poland); Lewenstein, M. [Institut fuer Theoretische Physik, Universitaet Hannover, D-30167 Hannover (Germany); ICFO - Institut de Ciencies Fotoniques, 08034 Barcelona (Spain)

2005-10-21

191

Atomic-level insights into metabolite recognition and specificity of the SAM-II riboswitch.  

PubMed

Although S-adenosylhomocysteine (SAH), a metabolic by-product of S-adenosylmethionine (SAM), differs from SAM only by a single methyl group and an overall positive charge, SAH binds the SAM-II riboswitch with more than 1000-fold less affinity than SAM. Using atomistic molecular dynamics simulations, we investigated the molecular basis of such high selectivity in ligand recognition by SAM-II riboswitch. The biosynthesis of SAM exclusively generates the (S,S) stereoisomer, and (S,S)-SAM can spontaneously convert to the (R,S) form. We, therefore, also examined the effects of (R,S)-SAM binding to SAM-II and its potential biological function. We find that the unfavorable loss in entropy in SAM-II binding is greater for (S,S)- and (R,S)-SAM than SAH, which is compensated by stabilizing electrostatic interactions with the riboswitch. The positively charged sulfonium moiety on SAM acts as the crucial anchor point responsible for the formation of key ionic interactions as it fits favorably in the negatively charged binding pocket. In contrast, SAH, with its lone pair of electrons on the sulfur, experiences repulsion in the binding pocket of SAM-II and is enthalpically destabilized. In the presence of SAH, similar to the unbound riboswitch, the pseudoknot structure of SAM-II is not completely formed, thus exposing the Shine-Dalgarno sequence. Unlike SAM, this may further facilitate ribosomal assembly and translation initiation. Our analysis of the conformational ensemble sampled by SAM-II in the absence of ligands and when bound to SAM or SAH reveals that ligand binding follows a combination of conformational selection and induced-fit mechanisms. PMID:22194311

Doshi, Urmi; Kelley, Jennifer M; Hamelberg, Donald

2011-12-22

192

Decidualized Pseudopregnant Rat Uterus Shows Marked Reduction in Ang II and Ang-(1-7) Levels  

PubMed Central

Previous studies showed that angiotensin (Ang) II and Ang-(1-7) concentrations were reduced in the implantation site at day 7 of pregnancy in Sprague-Dawley rats as compared to the site immediately adjacent to it, which does not have the embryo attached, clearly showing the importance of the blastocyst in the regulation of renin-angiotensin system (RAS). Objective The objective of this study was to evaluate the regulation of the RAS in the decidualized uterus in the pseudopregnant rat, a model without the presence of a conceptus. Methods Ovariectomized, adult female rats were sensitized for the decidual cell reaction with steroid treatments; decidualization was induced by oil-injection of the right horn; the left horn served as a control. The uterine content of Ang I, Ang II, and Ang-(1-7) was examined in the decidualized and non-decidualized uteri. Results Both Ang-(1-7) and Ang II and ACE and ACE2 mRNA were significantly reduced in the decidualized horn as compared to the non-decidualized horn. Immunocytochemical characterization of Ang II, Ang-(1-7), ACE and ACE2 demonstrated that Ang-(1-7), Ang II, and ACE2 polarize to the anti-mesometrial pole with decidualization. Conclusion The decidualization process elicits marked reduction in uterine Ang II and Ang-(1-7) content as compared to the non-decidualized horn. The differential immunocytochemical expression of Ang II and Ang-(1-7) with ACE2, but not ACE in the anti-mesometrial pole of the decidualized horn may favor the formation and action of Ang-(1-7) in the anti-mesometrial pole, an area which plays a role in triggering the decidualization process.

Brosnihan, KB; Bharadwaj, MS; Yamaleyeva, LM; Neves, LAA

2011-01-01

193

Adult ependymal tumors: prognosis and the M. D. Anderson Cancer Center experience  

PubMed Central

Ependymomas in adults are rare and often misdiagnosed. This study reports on a series of adult patients with confirmed ependymoma treated at The University of Texas M. D. Anderson Cancer Center (MDACC). Patients aged >17 and with ependymoma were identified, and clinical data were collected by retrospective chart review. Descriptive statistics were used to describe the clinical data, Kaplan–Meier methods were used to generate survival curves, and Cox proportional hazards models were used to evaluate the association of clinical characteristics with survival. This series included 123 adult patients [51% male; median age 39 years (18–72)]. Forty had tumors in the brain, 80 in the spine, and 3 had both. The majority were Grade I/II lesions (108) vs Grade III (anaplastic; 15). Eighteen patients had tumors that were reclassified as ependymal tumors at MDACC. The most common presenting symptom was pain, with an average of 4 symptoms reported prior to diagnosis. Sixty-three percent of patients had a gross total resection, and 49% received radiation therapy. Average follow-up was 5.5 years, and 13% had died. Median time to recurrence was 21 months (Grade II) brain and 18 months (Grade III). Worse outcome measured by overall and progression-free survival were associated with brain location (P = .01, P = .04) and tumor anaplasia (P = .0025, P = .001). An MIB-1 > 10 was associated with worse outcome (P = .03). Tumor grade and brain location are associated with a worse prognosis. Reclassification of ependymoma by neuropathologists is common. Results of this study have lead to a multicenter study to further define important diagnostic and prognostic variables for adults with ependymoma.

Armstrong, Terri S.; Vera-Bolanos, Elizabeth; Bekele, B. Nebiyou; Aldape, Kenneth; Gilbert, Mark R.

2010-01-01

194

Spectral classification using pattern-recognition techniques. II. Application to curium energy levels  

Microsoft Academic Search

Curium energy levels have been classified according to configuration using pattern-recognition techniques. Four features: energy level, Lande g, J, and isotope shift: have been used to describe each level. Forty levels have been assigned with high probability based on consistent results obtained by various pattern recognition techniques. This represents an increase of 9% for even levels and 19% for odd

K. L. Peterson; D. L. Anderson; M. L. Parsons

1978-01-01

195

Non-Equilibrium Tunneling Effects of Interacting Hubbard-Anderson Impurities.  

National Technical Information Service (NTIS)

Non-equilibrium interaction effects of Hubbard-Anderson impurities have been experimentally studied by means of STM/STS methods and theoretically analyzed using self-consistent approach based on Keldysh formalism.

P. I. Arseev N. S. Maslova V. I. Panov S. V. Savinov

2001-01-01

196

MD Anderson studies find proton therapy treatment preserves quality of life for men with prostate cancer  

Cancer.gov

Two studies led by The University of Texas MD Anderson Cancer Center have found that proton therapy preserves the quality of life, specifically urinary and bowel function, in men treated with this targeted radiation modality for prostate cancer.

197

Study of radioactivity levels in granite of Gable Gattar II in the north eastern desert of Egypt.  

PubMed

The present work deals with the radioactivity of granites in Gable Gattar II, which is located in the north eastern desert of Egypt. Fifty samples from the area of Gable Gattar II were investigated. The radionuclides of the samples, in Bq/kg, have been measured using a hyper-pure germanium spectrometer. The dose obtained for 238U and 232Th ranged from 165 +/- 5 to 27,851 +/- 836 and 71 +/- 2 to 274 +/- 8 Bq/kg, respectively. The dose of 40K only changes slightly. To assess the radiological hazard of the natural radioactivity in the samples, the radium equivalent activity, the absorbed dose rate and the external hazard index were calculated. This study provides a baseline map of radioactivity background levels in the Egyptian environment and will be used as reference information to assess any changes in the radioactive background level due to geological processes. The Gable Gattar granite, from uranium mineralization, has high economic potential. PMID:12137021

El-Shershaby, A

2002-07-01

198

Synthesis, cytotoxicity and DNA-binding levels of ammine\\/propylamine platinum(II) complexes with carboxylates  

Microsoft Academic Search

Seven new mixed ammine\\/propylamine platinum(II) complexes with carboxylates (a–g) have been synthesized and characterized by elemental analysis, conductivity, IR, UV, and 1H NMR spectra techniques. The cytotoxicity of these complexes was tested by MTT assay. The levels of total platinum bound to DNA were measured by ICP-MS. The results indicate that the complexes (a–g) have better cytotoxicity against EJ and

Jinchao Zhang; Xuejun Zhao

2007-01-01

199

Macular corneal dystrophy type II: Multiple studies on a cornea with low levels of sulphated keratan sulphate  

Microsoft Academic Search

We investigated an individual macular corneal dystrophy (MCD) type II cornea from a 42-year-old woman with markedly reduced antigenic keratan sulphate levels. A characteristic 4.6 Å X-ray reflection was evident, and the mid-stroma contained 30% less sulphur than normal. Close packing of collagen was restricted to the superficial stroma. Abnormally large proteoglycan filaments were noted throughout the extracellular matrix and

Andrew J Quantock; Nigel J Fullwood; Eugene J-M A Thonar; Stephen R Waltman; Malcolm S Capel; Mitsutoshi Ito; Steven M Verity; David J Schanzlin

1997-01-01

200

PRESTO-II computer code for safety assessment on shallow land disposal of low-level wastes  

SciTech Connect

The PRESTO-II (Prediction of Radiation Effects from Shallow Trench Operations) computer code has been applied for the following sites; Koteyli, Balikesir and Kozakli, Nevsehir in Turkey. This site selection was based partially on the need to consider a variety of hydrologic and climatic situations, and partially on the availability of data. The results obtained for the operational low-level waste disposal site at Barnwell, South Carolina, are presented for comparison. 6 refs., 2 figs., 1 tab.

Uslu, I.; Fields, D.E.; Yalcintas, M.G.

1987-01-01

201

Adaptive Thouless-Anderson-Palmer approach to inverse Ising problems with quenched random fields.  

PubMed

The adaptive Thouless-Anderson-Palmer equation is derived for inverse Ising problems in the presence of quenched random fields. We test the proposed scheme on Sherrington-Kirkpatrick, Hopfield, and random orthogonal models and find that the adaptive Thouless-Anderson-Palmer approach allows accurate inference of quenched random fields whose distribution can be either Gaussian or bimodal. In particular, another competitive method for inferring external fields, namely, the naive mean field method with diagonal weights, is compared and discussed. PMID:23848649

Huang, Haiping; Kabashima, Yoshiyuki

2013-06-19

202

Anderson localization of one-dimensional hybrid particles  

NASA Astrophysics Data System (ADS)

We solve the Anderson localization problem on a two-leg ladder by the Fokker-Planck equation approach. The solution is exact in the weak disorder limit at a fixed interchain coupling. The study is motivated by progress in investigating the hybrid particles such as cavity polaritons. This application corresponds to parametrically different intrachain hopping integrals (a “fast” chain coupled to a “slow” chain). We show that the canonical Dorokhov-Mello-Pereyra-Kumar (DMPK) equation is insufficient for this problem. Indeed, the angular variables describing the eigenvectors of the transmission matrix enter into an extended DMPK equation in a nontrivial way, being entangled with the two transmission eigenvalues. This extended DMPK equation is solved analytically and the two Lyapunov exponents are obtained as functions of the parameters of the disordered ladder. The main result of the paper is that near the resonance energy, where the dispersion curves of the two decoupled and disorder-free chains intersect, the localization properties of the ladder are dominated by those of the slow chain. Away from the resonance they are dominated by the fast chain: a local excitation on the slow chain may travel a distance of the order of the localization length of the fast chain.

Xie, Hong-Yi; Kravtsov, V. E.; Müller, M.

2012-07-01

203

A local moment approach to the degenerate Anderson impurity model.  

PubMed

The local moment approach is extended to the orbitally degenerate (SU(2N)) Anderson impurity model (AIM). Single-particle dynamics are obtained over the full range of energy scales, focusing on particle-hole symmetry in the strongly-correlated regime where the onsite Coulomb interaction leads to many-body Kondo physics with entangled spin and orbital degrees of freedom. The approach captures many-body broadening of the Hubbard satellites and recovers the correct exponential vanishing of the Kondo scale for all N, and its universal scaling spectra are found to be in very good agreement with numerical renormalization group (NRG) results. In particular the high-frequency logarithmic decays of the scaling spectra, obtained here in closed form for arbitrary N, coincide essentially perfectly with available numerics from the NRG. A particular case of an anisotropic Coulomb interaction, in which the model represents a system of N 'capacitively coupled' SU(2) AIMs, is also discussed. Here the model is generally characterized by two low-energy scales, the crossover between which is seen directly in its dynamics. PMID:21832350

Galpin, Martin R; Gilbert, Anne B; Logan, David E

2009-08-13

204

Kondo hole route to incoherence in the periodic Anderson model  

NASA Astrophysics Data System (ADS)

The interplay of disorder and interactions in strongly correlated electronic systems is a subject of perennial interest. In this work, we have investigated the effect of Kondo-hole type disorder on the dynamics and transport properties of heavy fermion systems. We employ the periodic Anderson model within the framework of coherent potential approximation and dynamical mean field theory. The crossover from lattice coherent behaviour to an incoherent single-impurity behaviour is reflected in all aspects: a highly frequency (?)-dependent hybridization becomes almost flat, the coherence peak in resistivity (per impurity) gives way to a Hammann form that saturates at low temperature (T); the Drude peak and the mid-infrared peak in the optical conductivity vanish almost completely. The zero temperature resistivity can be captured in a closed form expression, and we show how the Nordheim's rule gets strongly modified in these systems. The thermopower exhibits a characteristic peak, which changes sign with increasing disorder, and its location is shown to correspond to the low energy scale of the system (?L). In fact, the thermopower appears to be much more sensitive to disorder variations than the resistivity. A comparison to experiments yields quantitative agreement.

Kumar, Pramod; Vidhyadhiraja, N. S.

2013-03-01

205

The Universality Classes in the Parabolic Anderson Model  

NASA Astrophysics Data System (ADS)

We discuss the long time behaviour of the parabolic Anderson model, the Cauchy problem for the heat equation with random potential onmathbb{Z}d. We consider general i.i.d. potentials and show that exactly four qualitatively different types of intermittent behaviour can occur. These four universality classes depend on the upper tail of the potential distribution: (1) tails at ? that are thicker than the double-exponential tails, (2) double-exponential tails at ? studied by Gärtner and Molchanov, (3) a new class called almost bounded potentials, and (4) potentials bounded from above studied by Biskup and König. The new class (3), which contains both unbounded and bounded potentials, is studied in both the annealed and the quenched setting. We show that intermittency occurs on unboundedly increasing islands whose diameter is slowly varying in time. The characteristic variational formulas describing the optimal profiles of the potential and of the solution are solved explicitly by parabolas, respectively, Gaussian densities. Our analysis of class (3) relies on two large deviation results for the local times of continuous-time simple random walk. One of these results is proved by Brydges and the first two authors in [BHK04], and is also used here to correct a proof in [BK01].

van der Hofstad, Remco; König, Wolfgang; Mörters, Peter

2006-10-01

206

Anderson localization of polar eigenmodes in random planar composites  

NASA Astrophysics Data System (ADS)

Anderson localization of classical waves in disordered media is a fundamental physical phenomenon that has attracted attention in the past three decades. More recently, localization of polar excitations in nanostructured metal-dielectric films (also known as random planar composites) has been subject of intense studies. Potential applications of planar composites include local near-field microscopy and spectroscopy. A number of previous studies have relied on the quasistatic approximation and a direct analogy with localization of electrons in disordered solids. Here I consider the localization problem without the quasistatic approximation. I show that localization of polar excitations is characterized by algebraic rather than by exponential spatial confinement. This result is also valid in two and three dimensions. I also show that the previously used localization criterion based on the gyration radius of eigenmodes is inconsistent with both exponential and algebraic localization. An alternative criterion based on the dipole participation number is proposed. Numerical demonstration of a localization-delocalization transition is given. Finally, it is shown that, contrary to the previous belief, localized modes can be effectively coupled to running waves.

Markel, Vadim A.

2006-12-01

207

Band Magnetism in the Two Channel Anderson Lattice Model  

NASA Astrophysics Data System (ADS)

The two channel Anderson Model for uranium ions, comprised of a quadrupolar and a magnetic doublet, exhibits non-Fermi-liquid properties in the paramagnetic phase caused by incoherent spin scattering of a degenerate ground state. It is expected, that the residual entropy will be quenched by a phase transition. The magnetic properties of this model are investigated through the crossover from the Kondo to the weak mixed-valent regime using dynamical mean field theory. A magnetic transition is found in the crossover regime at incommensurable wave vectors. The tendency towards nearest neighbour anti-ferromagnetism is enhanced in the Kondo regime. However, a spin density wave transition, which has an increasing q-vector for a decreasing effective coupling J=V^2/|?_f|, maintains the highest transition temperature T_m. At small coupling, Tm is governed by the RKKY energy scale J^2?(0) in accordance with the Doniach criterion. We report hints to a ferro-magnetic transition in the mixed-valent regime. The origin of the competition between anti-ferromagnetism and spin density waves at small q wave-vectors are discussed. A connection to channel ordering and odd-frequency superconductivity is made. Ref: F.B. Anders, Phys.Rev. Lett., 83, 4638

Anders, Frithjof B. B.

2000-03-01

208

A local moment approach to the degenerate Anderson impurity model  

NASA Astrophysics Data System (ADS)

The local moment approach is extended to the orbitally degenerate (SU(2N)) Anderson impurity model (AIM). Single-particle dynamics are obtained over the full range of energy scales, focusing on particle-hole symmetry in the strongly-correlated regime where the onsite Coulomb interaction leads to many-body Kondo physics with entangled spin and orbital degrees of freedom. The approach captures many-body broadening of the Hubbard satellites and recovers the correct exponential vanishing of the Kondo scale for all N, and its universal scaling spectra are found to be in very good agreement with numerical renormalization group (NRG) results. In particular the high-frequency logarithmic decays of the scaling spectra, obtained here in closed form for arbitrary N, coincide essentially perfectly with available numerics from the NRG. A particular case of an anisotropic Coulomb interaction, in which the model represents a system of N 'capacitively coupled' SU(2) AIMs, is also discussed. Here the model is generally characterized by two low-energy scales, the crossover between which is seen directly in its dynamics.

Galpin, Martin R.; Gilbert, Anne B.; Logan, David E.

2009-09-01

209

A NON-INVASIVE TECHNIQUE FOR CONFIGURING LOW LEVEL RF FEEDBACK LOOPS IN PEP-II  

Microsoft Academic Search

The RF system of the PEP-II collider uses two fast feed- back loops around each klystron and set of cavities. These loops reduce the impedance of the fundamental mode of the accelerating cavities seen by the beam, and are nec- essary to reduce the growth rates of longitudinal modes within the RF system bandwidth. Operation of the accel- erator at

D. Teytelmany

210

Mean Lives of Some Excited Levels of Li I and Li II.  

National Technical Information Service (NTIS)

A beam of Li(+) ions accelerated to 56 keV by an electromagnetic isotope separator was directed through a thin carbon foil. The emergent ions were in various charge and excitation states, from which 26 spectral lines of Li I and Li II were identified. The...

W. S. Bickel I. Martinson L. Lundin R. Buchta J. Bromander

1969-01-01

211

Effect of policosanol in lowering cholesterol levels in patients with type II hypercholesterolemia  

Microsoft Academic Search

A randomized double-blind, placebo-controlled study was conducted in 45 patients with type II hypercholesterolemia to investigate the efficacy and safety of policosanol administered at 10 mg daily (5 mg twice daily). After adhering to a cholesterol-lowering diet-only period, 45 outpatients in whom serum cholesterol and LDL-C values were not controlled sufficiently b diet alone were randomized to receive policosanol or

Ernesto Aneiros; Rosa Más; Braulio Calderon; Jose Illnait; Lilia Fernández; Gladys Castaño; Julio César Fernández

1995-01-01

212

Theoretical studies of electronic band-tail states, Anderson transition and surfaces of amorphous semiconductors  

NASA Astrophysics Data System (ADS)

In this dissertation, we study the Anderson transition within the electronic band tail states, and amorphous surfaces. The disorder induced band tail states is one of the unique character of amorphous semiconductors. Because of the proximity to the Fermi level, the nature of these band tail states is of obvious interest to theory of doping and transport. The study of amorphous solid surface is also an interesting area for theory. It is possible to have some major rearrangements near surfaces of amorphous solids (the amorphous analog of surface reconstruction), and the local bonding environment could be dramatically different from that of bulk. The study of the surfaces can also help people toward understanding the growth mechanism. First, electronic band tail states of amorphous silicon and amorphous diamond were studied based on the large (4096 atom) and realistic structural models. To solve the large tight-binding Hamiltonian matrices, we used two order N methods: the maximum entropy method for computing the total densities of states, and the modified Lanczos techniques for computing the individual energy eigenstates in the band gap regions. The DC conductivity was estimated with the Kubo formula. Next, the structural and electronic properties of the surfaces of tetrahedral amorphous carbon (ta-C) were also studied with a first-principles, local basis LDA technique. We reported two structural models made under different conditions, and examined the transition of the local bonding environment from the bulk to the surface. In the study of band tail states, we observe that Anderson (local-to-extended) transition within the band states proceeds by "cluster proliferation". We interpret the nature of band tail states in terms of a "resonant cluster model" through which one can qualitatively understand the evolution of the states from midgap toward the mobility edges. In the study of ta-C surfaces, we observe that nearly 50% surface atoms are threefold coordinated and planar rings or chains are formed with the spsp2 bonds. This "graphization" character also significantly influences its electronic properties. Electrons are easily de-localized within these surface spsp2 rings/chains and some the surface electronic eigenstates become extended along the surface through such rings/chains.

Dong, Jianjun

213

Attenuated Topoisomerase II Content Directly Correlates with a Low Level of Drug Resistance in a Chinese Hamster Ovary Cell Line1  

Microsoft Academic Search

A new multiple drug-resistant Chinese hamster ovary cell line, ( IK )- SMRs, has been isolated which demonstrates a direct correlation between reduced cellular topoisomerase II activity (5-fold reduction) and a low level of resistance (3- to 7-fold) to topoisomerase II inhibitors. This cell line, initially selected for resistance to 9-(4,6-0-ethylidene-i8-D-gluco- pyranosyl)-4'-demethylepipodophyllotoxin, exhibits cross-resistance to other topoisomerase II inhibitors including

Charles D. Webb; Michael D. Latham; Richard B. Lock; Daniel M. Sullivan

1991-01-01

214

Evidence for linkage of the apolipoprotein A-II locus to plasma apolipoprotein A-II and free fatty acid levels in mice and humans  

SciTech Connect

Although it has been hypothesized that the synteny between mouse and human genes provides an approach to the localization of genes that determine quantitative traits in humans, this has yet to be demonstrated. The authors tested this approach with two quantitative traits, plasma apolipoprotein A-II (apoAII) and free fatty acid (FFA) levels. ApoAII is the second most abundant protein of high density lipoprotein particles, but its function remains largely unknown. The authors show that, in a backcross between strains Mus spretus and C56BL/6J, apoAII levels correlate with plasma FFA concentrations on both chow (P<0.0001) and high-fat (P < 0.0003) diets and that apoAII levels are linked to the apoAII gene (P<0.0002). To test whether variations of the apoAII gene influence plasma lipid metabolism in humans, the authors studied 306 individuals in 25 families enriched for coronary artery disease. The segregation of the apoAII gene was followed by using an informative simple sequence repeat in the second intron of the gene and two nearby genetic markers. Robust sib-pair linkage analysis was performed on members of these families using the SAGE linkage programs. The results suggest linkage between the human apoAII gene and a gene controlling plasma apoAII levels (P = 0.03). Plasma apoAII levels were also significantly correlated with plasma FFA levels (P = 0.007). Moreover, the apoAII gene exhibited linkage with a gene controlling FFA levels (P = 0.003). Evidence for nonrandom segregation was seen with markers as far as 6-12 centimorgans from the apoAII structural locus. These data provide evidence, in two species, that the apoAII gene is linked to a gene that controls plasma apoAII levels and that apoAII influences, by an unknown mechanism, plasma FFA level. The results illustrate the utility of animal studies for analysis of complex traits.

Warden, C.H.; Daluiski, A.; Purcell-Huynh, D.A.; De Meester, C.; Shieh, B.H.; Lusis, A.J.; Puppione, D.L. (Univ. of California, Los Angeles, CA (United States)); Bu, Xiangdong; Gray, R.M.; Rotter, J.I. (Cedars-Sinai Medical Center, Los Angeles, CA (United States)) (and others)

1993-11-15

215

Exact interacting Green's function for the Anderson impurity at high bias voltages  

NASA Astrophysics Data System (ADS)

We describe some exact high-energy properties of a single Anderson impurity connected to two noninteracting leads in a nonequilibrium steady state. In the limit of high bias voltages, and also in the high-temperature limit at thermal equilibrium, the model can be mapped onto an effective non-Hermitian Hamiltonian consisting of two sites, which correspond to the original impurity and its image that is defined in a doubled Hilbert space referred to as Liouville-Fock space. For this, we provide a heuristic derivation using a path-integral representation of the Keldysh contour and the thermal field theory, in which the time evolution along the backward contour is replicated by extra degrees of freedom corresponding to the image. We find that the effective Hamiltonian can also be expressed in terms of charges and currents. From this, it can be deduced that the dynamic susceptibilities for the charges and the current fluctuations become independent of the Coulomb repulsion U in the high bias limit. Furthermore, the equations of motion for the Green's function and two other higher-order correlation functions constitute a closed system. The exact solution obtained from the three coupled equations extends the atomic-limit solution such that the self-energy correctly captures the imaginary part caused by the relaxation processes at high energies. The spectral weights of the upper and lower Hubbard levels depend sensitively on the asymmetry in the tunneling couplings to the left and right leads.

Oguri, Akira; Sakano, Rui

2013-10-01

216

Valence Instability and Mass Enhancement in an Extended Periodic Anderson Model  

NASA Astrophysics Data System (ADS)

In CeCu2Si2, CeCu2Ge2 and CeRh1-xIrxIn5, the shape of the superconducting region is asymmetric and the superconducting transtition temperature Tc reaches its maximum far away from the antiferromagnetic quantum critical point. Onishi and Miyake ascribed the asymmetric behavior of Tc to the enhanced valence fluctuations. They introduced the repulsive interaction Ucf between a conduction electron and an f electron, in addition to the Coulomb interaction U between f electrons and studied the periodic Anderson model (PAM) with both U and Ucf (which is the so-called extended PAM). We investigated the valence instability in the extended PAM and two-fold degenerate extended PAM with the dynamical mean field theory. In these models, we found that the valence instability is observed when Ucf is larger than the conduction band width 2W and the f-electron level ?f is deeper than the lower bound of the conduction band, -W. It is also found that the orbital degeneracy suppresses the valence instability. In the parameter region of inducing the valence instability, we investigate the mass enhancement factor Zf-1 which is related to the specific heat.

Sugibayashi, Takashi; Saiga, Yasuhiro; Hirashima, Dai

2008-03-01

217

The lysosomal inhibitor, chloroquine, increases cell surface BMPR-II levels and restores BMP9 signalling in endothelial cells harbouring BMPR-II mutations.  

PubMed

Pulmonary arterial hypertension (PAH) is characterized by dysregulated pulmonary artery endothelial cell (PAEC) proliferation, apoptosis and permeability. Loss-of-function mutations in the bone morphogenetic protein receptor type-II (BMPR-II) are the most common cause of heritable PAH, usually resulting in haploinsufficiency. We previously showed that BMPR-II expression is regulated via a lysosomal degradative pathway. Here, we show that the antimalarial drug, chloroquine, markedly increased cell surface expression of BMPR-II protein independent of transcription in PAECs. Inhibition of protein synthesis experiments revealed a rapid turnover of cell surface BMPR-II, which was inhibited by chloroquine treatment. Chloroquine enhanced PAEC expression of BMPR-II following siRNA knockdown of the BMPR-II transcript. Using blood outgrowth endothelial cells (BOECs), we confirmed that signalling in response to the endothelial BMPR-II ligand, BMP9, is compromised in BOECs from patients harbouring BMPR-II mutations, and in BMPR-II mutant PAECs. Chloroquine significantly increased gene expression of BMP9-BMPR-II signalling targets Id1, miR21 and miR27a in both mutant BMPR-II PAECs and BOECs. These findings provide support for the restoration of cell surface BMPR-II with agents such as chloroquine as a potential therapeutic approach for heritable PAH. PMID:23669347

Dunmore, Benjamin J; Drake, Kylie M; Upton, Paul D; Toshner, Mark R; Aldred, Micheala A; Morrell, Nicholas W

2013-05-12

218

The lysosomal inhibitor, chloroquine, increases cell surface BMPR-II levels and restores BMP9 signalling in endothelial cells harbouring BMPR-II mutations  

PubMed Central

Pulmonary arterial hypertension (PAH) is characterized by dysregulated pulmonary artery endothelial cell (PAEC) proliferation, apoptosis and permeability. Loss-of-function mutations in the bone morphogenetic protein receptor type-II (BMPR-II) are the most common cause of heritable PAH, usually resulting in haploinsufficiency. We previously showed that BMPR-II expression is regulated via a lysosomal degradative pathway. Here, we show that the antimalarial drug, chloroquine, markedly increased cell surface expression of BMPR-II protein independent of transcription in PAECs. Inhibition of protein synthesis experiments revealed a rapid turnover of cell surface BMPR-II, which was inhibited by chloroquine treatment. Chloroquine enhanced PAEC expression of BMPR-II following siRNA knockdown of the BMPR-II transcript. Using blood outgrowth endothelial cells (BOECs), we confirmed that signalling in response to the endothelial BMPR-II ligand, BMP9, is compromised in BOECs from patients harbouring BMPR-II mutations, and in BMPR-II mutant PAECs. Chloroquine significantly increased gene expression of BMP9-BMPR-II signalling targets Id1, miR21 and miR27a in both mutant BMPR-II PAECs and BOECs. These findings provide support for the restoration of cell surface BMPR-II with agents such as chloroquine as a potential therapeutic approach for heritable PAH.

Dunmore, Benjamin J.; Drake, Kylie M.; Upton, Paul D.; Toshner, Mark R.; Aldred, Micheala A.; Morrell, Nicholas W.

2013-01-01

219

The Indian Reading Series: Stories and Legends of the Northwest. Level II. Books 1-20.  

ERIC Educational Resources Information Center

|Designed as supplementary reading materials for Indian and non-Indian children in the primary grades, this series of 10 booklets presents 13 legends and 7 stories of Northwest tribes. Stories in this second level of the six-level series were developed cooperatively by people of the Crow, Muckleshoot, Skokomish, Blackfeet, Northern Cheyenne,…

Northwest Regional Educational Lab., Portland, OR.

220

Homogenisation of climate time series from ICP Forests Level II monitoring sites in Germany based on interpolated climate data  

Microsoft Academic Search

– \\u000a \\u000a • The aim of our work was to homogenise the meteorological dataset of German ICP Forests Level II sites (n = 73) by the aid of interpolations based on climate data from the German meteorological network (DWD).\\u000a \\u000a \\u000a \\u000a \\u000a – \\u000a \\u000a • For each site daily values of climate variables (temperature, precipitation, solar radiation, relative humidity and wind\\u000a speed) were interpolated by

Daniel Ziche; Walter Seidling

2010-01-01

221

Two-dimensional Anderson-Hubbard model in the DMFT + {Sigma} approximation  

SciTech Connect

The density of states, the dynamic (optical) conductivity, and the phase diagram of the paramagnetic two-dimensional Anderson-Hubbard model with strong correlations and disorder are analyzed within the generalized dynamical mean field theory (DMFT + {Sigma} approximation). Strong correlations are accounted by the DMFT, while disorder is taken into account via the appropriate generalization of the self-consistent theory of localization. We consider the two-dimensional system with the rectangular 'bare' density of states (DOS). The DMFT effective single-impurity problem is solved by numerical renormalization group (NRG). The 'correlated metal,' Mott insulator, and correlated Anderson insulator phases are identified from the evolution of the density of states, optical conductivity, and localization length, demonstrating both Mott-Hubbard and Anderson metal-insulator transitions in two-dimensional systems of finite size, allowing us to construct the complete zero-temperature phase diagram of the paramagnetic Anderson-Hubbard model. The localization length in our approximation is practically independent of the strength of Hubbard correlations. But the divergence of the localization length in a finite-size two-dimensional system at small disorder signifies the existence of an effective Anderson transition.

Kuchinskii, E. Z., E-mail: kuchinsk@iep.uran.ru; Kuleeva, N. A.; Nekrasov, I. A.; Sadovskii, M. V., E-mail: sadovski@iep.uran.r [Russian Academy of Sciences, Institute for Electrophysics (Russian Federation)

2010-02-15

222

Level Flotation Standards Analysis Research and Development Report. Phase II - Special Problems.  

National Technical Information Service (NTIS)

The objective of the study reported herein was to provide information that would assist in finalizing a level flotation standard. This report provides data that will be useful in defining longitudinal and transverse limits for test weight placement for co...

C. Sautkulis

1975-01-01

223

Analysis of the Distribution of the Spacings Between Nuclear Energy Levels. II  

Microsoft Academic Search

The statistic Lambda(n), previously defined for the purpose of comparing empirical distributions of energy-level spacings with theoretical distributions, is applied to the recently published series of neutron-capture levels observed in the even-A erbium isotopes. When the empirical values of Lambda(n) in the energy range of the highest experimental resolution were averaged over all possible sets of n successive spacings, the

James E. Monahan; Norbert Rosenzweig

1972-01-01

224

Agronomic factors affecting polonium-210 and lead-210 levels in tobacco. II. Varieties and curing methods  

Microsoft Academic Search

Tobacco seedlings accumulated Pb²¹° and Po²¹° to a concentration much higher than that found in the soil. The levels of these radioelements decreased as the plants grew. Only minor differences were observed in harvested leaves of two flue-cured varieties - Coker 319 and Virginia Bright Leaf. The Pb²¹° and Po²¹° content in the seeds are in much lower levels than

T. C. Tso; J. M. Carr; E. S. Ferri; E. J. Baratta

2009-01-01

225

1'-Acetoxychavicol acetate enhances the phase II enzyme activities via the increase in intranuclear Nrf2 level and cytosolic p21 level.  

PubMed

(1'S)-acetoxychavicol acetate ((S)-ACA) exhibits chemopreventive effects on chemically induced tumor formation. It has been shown that ACA inhibited the development of azoxymethane-induced colon carcinogenesis through its suppression of cell proliferation in the colonic mucosa and its induction of glutathione S-transferase and quinone oxidoreductase 1 in vivo. In this study, we investigated how ACA induced these enzymes by using rat intestine epithelial cells (IEC6) in vitro. ACA induced glutathione S-transferase (GST) and NAD (P)H: quinone oxidoreductase 1 (NQO1) activities, increased intracellular glutathione (GSH) level, and upregulated intranuclear Nrf2 and cytosolic p21. It suggested that activation of phase II enzymes via Nrf2 associated with p21 is one of possible mechanisms of ACA to prevent advance of carcinogenesis. PMID:21721157

Yaku, Keisuke; Matsui-Yuasa, Isao; Azuma, Hideki; Kojima-Yuasa, Akiko

2011-01-01

226

Light Quality and Irradiance Level Interaction in the Control of Expression of Light-Harvesting Complex of Photosystem II  

PubMed Central

Effects of red and blue light at irradiances from 1.6 to 28.3 micromolar per square meter per second on chloroplast pigments, light-harvesting pigment-proteins associated with photosystem II, and the corresponding mRNA were evaluated in maize (Zea mays L.) plants (OP Golden Bantum) grown for 14 days under 14 hours light/10 hours dark cycles. Accumulation of pigments, pigment-proteins, and mRNA was less in blue than in red light of equal irradiance. The difference between blue and red light, however, varied as a function of irradiance level, and the pattern of this variation suggests irradiance-controlled activation/deactivation (switching) of blue-light receptor. The maximum reduction in blue light of mRNA and proteins associated with light-harvesting complex occurs at lower irradiance levels than the maximum reduction of chlorophylls a and b. Images Figure 5 Figure 6

Eskins, Kenneth; Westhoff, Peter; Beremand, Phillip D.

1989-01-01

227

Development of a clinical pathway for near-term and convalescing premature infants in a Level II nursery.  

PubMed

A subcategory of premature infants, those born near term at 34 to 36 and 6/7 weeks gestation, may represent a previously unrecognized at-risk neonatal population. Evidence-based practice guidelines, crafted specifically for this population, are needed to effectively manage their care. In an effort to meet the needs of the near-term infant (NTI) population, and concurrently address the needs of the convalescing premature infants reverse transported to a Level II nursery setting, a multidisciplinary team of clinicians designed tools to provide a more consistent approach to care for and discharge these infants. This article describes the design, implementation, and evaluation of an evidence-based multidisciplinary clinical pathway specific to the needs of the NTI, including care plans, a standardized physician admission and discharge order set, evidence-based interventions, parent education, and recommendations for follow-up after hospital discharge that were developed for use in a Level II nursery. The use of the premature and near-term infant pathway has now been expanded to NTIs cared for in the newborn nursery, thereby ensuring safe, consistent, quality care for this population, regardless of their setting. PMID:16750809

Campbell, Margie A

2006-06-01

228

A three-level model for alkali metal vapor lasers. Part II: broadband optical pumping  

NASA Astrophysics Data System (ADS)

The effects of pump laser spectral bandwidth on the performance of longitudinally pumped diode-pumped alkali lasers is explored by extending the analytic, three-level model using longitudinally averaged number densities. By assuming a statistical distribution between the upper two levels, the limiting solution for the quasi-two level system is achieved. A second limiting solution is identified for strongly bleached conditions where the atom recycle rate, limited by spin-orbit relaxation, fully specifies the output power. Performance in the intermediate regime depends significantly on the pump bandwidth relative to the atomic absorption line width and requires numerical simulation. The ratio of populations for the two excited, 2P3/2,1/2 states completes an analytic solution and depends primarily on pump laser bandwidth, threshold, and alkali concentration. Absorption well into the wings on the atomic profile can be utilized by increasing alkali concentration, but imposes increased pump intensity threshold.

Hager, Gordon D.; Perram, Glen P.

2013-09-01

229

Self-Consistent Theory of Anderson Localization:. General Formalism and Applications  

NASA Astrophysics Data System (ADS)

The self-consistent theory of Anderson localization of quantum particles or classical waves in disordered media is reviewed. After presenting the basic concepts of the theory of Anderson localization in the case of electrons in disordered solids, the regimes of weak and strong localization are discussed. Then the scaling theory of the Anderson localization transition is reviewed. The renormalization group theory is introduced and results and consequences are presented. It is shown how scale-dependent terms in the renormalized perturbation theory of the inverse diffusion coefficient lead in a natural way to a self-consistent equation for the diffusion coefficient. The latter accounts quantitatively for the static and dynamic transport properties except for a region near the critical point. Several recent applications and extensions of the self-consistent theory, in particular for classical waves, are discussed.

Wölfle, P.; Vollhardt, D.

230

Abrupt physical and chemical changes during 1992-1999, Anderson Springs, SE Geyser Geothermal Field, California  

USGS Publications Warehouse

The Anderson Springs area is located about 90 miles (145 kilometers) north of San Francisco, California, in the southwestern part of Lake County. The area was first developed in the late 1800s as a health resort, which was active until the 1930s. Patrons drank a variety of cool to hot mineral waters from improved springs, swam in various baths and pools, and hiked in the rugged hills flanking Anderson Creek and its tributaries. In the bluffs to the south of the resort were four small mercury mines of the eastern Mayacmas quicksilver district. About 1,260 flasks of mercury were produced from these mines between 1909 and 1943. By the early 1970s, the higher ridges south and west of Anderson Springs became part of the southeast sector of the greater Geysers geothermal field. Today, several electric power plants are built on these ridges, producing energy from a vapor-dominated 240 ?C reservoir. Only the main hot spring at Anderson Springs has maintained a recognizable identity since the 1930s. The hot spring is actually a cluster of seeps and springs that issue from a small fault in a ravine southwest of Anderson Creek. Published and unpublished records show that the maximum temperature (Tm) of this cluster fell gradually from 63?C in 1889 to 48?C in 1992. However, Tm of the cluster climbed to 77?C in 1995 and neared boiling (98?C) in 1998. A new cluster of boiling vents and small fumaroles (Tm = 99.3?C) formed in 1998 about 30 m north of the old spring cluster. Several evergreen trees on steep slopes immediately above these vents apparently were killed by the new activity. Thermal waters at Anderson Hot Springs are mostly composed of near-surface ground waters with some added gases and condensed steam from The Geysers geothermal system. Compared to gas samples from Southeast Geysers wells, the hot spring gases are higher in CO2 and lower in H2S and NH3. As the springs increased in temperature, however, the gas composition became more like the mean composition of steam discharges from the Southeast Geysers. The hot spring waters are low in ions of Cl, B, and Li, but relatively high in HCO3, SO4 and NH4. The stable-isotope compositions (deuterium and oxygen-18) of these waters plot near the global meteoric water line. Geochemical data through time reveal apparent maxima in the concentrations of SO4, Fe, and Mn in 1991 to 1992, before the cluster became hotter. The black-to-gray deposits from the new spring cluster are rich in pyrite and contain anomalous metals. About one-half mile to the east of the hot springs, mineralized water discharges intermittently from an old adit of the Schwartz (Anderson) mine, and enters a tributary of Anderson Creek. This drainage increased substantially in July 1998, and a slurry of mine water and precipitates were transported down the tributary and into Anderson Creek. In December 1998, the adit water was 22?C, and had a chemical composition that was similar to spring waters that once discharged in the ravines surrounding the old Anderson Springs resort. The cause for the abrupt changes that have occurred in thermal features at Anderson Springs is still not resolved. One possibility is that these changes are a response to withdrawal of steam from The Geysers geothermal field over more than 20 years of production. Pressure declines in the geothermal reservoir may have caused a 'drying out' of the overlying condensation zone. Induced boiling in this zone and upflow of deep steam to shallower depths would cause heating and vaporization of shallow ground waters. In addition, earthquakes occurring in the vicinity of Anderson Springs have increased significantly after nearby geothermal power plants began operation. These earthquakes may have enhanced surface discharge of thermal fluids along fractures and faults.

Janik, Cathy J.; Goff, Fraser; Walter, S. R.; Sorey, M. L.; Counce, Dale; Colvard, E. M.

2000-01-01

231

PRESTO-II: a low-level waste environmental transport and risk assessment code  

SciTech Connect

PRESTO-II (Prediction of Radiation Effects from Shallow Trench Operations) is a computer code designed for the evaluation of possible health effects from shallow-land and, waste-disposal trenches. The model is intended to serve as a non-site-specific screening model for assessing radionuclide transport, ensuing exposure, and health impacts to a static local population for a 1000-year period following the end of disposal operations. Human exposure scenarios considered include normal releases (including leaching and operational spillage), human intrusion, and limited site farming or reclamation. Pathways and processes of transit from the trench to an individual or population include ground-water transport, overland flow, erosion, surface water dilution, suspension, atmospheric transport, deposition, inhalation, external exposure, and ingestion of contaminated beef, milk, crops, and water. Both population doses and individual doses, as well as doses to the intruder and farmer, may be calculated. Cumulative health effects in terms of cancer deaths are calculated for the population over the 1000-year period using a life-table approach. Data are included for three example sites: Barnwell, South Carolina; Beatty, Nevada; and West Valley, New York. A code listing and example input for each of the three sites are included in the appendices to this report.

Fields, D.E.; Emerson, C.J.; Chester, R.O.; Little, C.A.; Hiromoto, G.

1986-04-01

232

Homemade Equipment for the Teaching of Electrochemistry at Advanced Level. Part II.  

ERIC Educational Resources Information Center

Provides a detailed description for the construction of equipment needed to investigate acid/base equilibria through the measurement of pH and potentiometric titrations. Suggested experiments and calibration techniques are explained. This information helps to solve the problems of inadequate, expensive equipment required for A-level chemistry…

Chan, K. M.

1985-01-01

233

Level set approach for computing solutions to incompressible two- phase flow II.  

National Technical Information Service (NTIS)

A level set method for capturing the interface between two fluids is combined with a variable density projection method to allow for computation of two-phase flow where the interface can merge/break and the flow can have a high Reynolds number. A distance...

M. Sussman E. Fatemi S. Osher P. Smereka

1995-01-01

234

BICYCLE II: a computer code for calculating levelized life-cycle costs  

SciTech Connect

This report describes the BICYCLE computer code. BICYCLE was specifically designed to calculate levelized life-cycle costs for plants that produce electricity, heat, gaseous fuels, or liquid fuels. Included are (1) derivations of the equations used by BICYCLE, (2) input instructions, (3) sample case input, and (4) sample case output.

Hardie, R.W.

1981-11-01

235

Homemade Equipment for the Teaching of Electrochemistry at Advanced Level. Part II.  

ERIC Educational Resources Information Center

|Provides a detailed description for the construction of equipment needed to investigate acid/base equilibria through the measurement of pH and potentiometric titrations. Suggested experiments and calibration techniques are explained. This information helps to solve the problems of inadequate, expensive equipment required for A-level chemistry…

Chan, K. M.

1985-01-01

236

Applicability of bosonization and the Anderson-Yuval methods at the strong-coupling limit of quantum impurity problems  

NASA Astrophysics Data System (ADS)

The applicability of bosonization and the Anderson-Yuval (AY) approach at strong coupling is investigated by considering two generic impurity models: the interacting resonant-level model and the anisotropic Kondo model. The two methods differ in the renormalization of the conduction-electron density of states (DOS) near the impurity site. Reduction in the DOS, absent in bosonization but accounted for in the AY approach, is shown to be vital in some models yet superfluous in others. The criterion is the stability of the strong-coupling fixed point. Renormalization of the DOS is essential for an unstable fixed point but superfluous when a decoupled entity with local dynamics is formed. This rule can be used to boost the accuracy of both methods at strong coupling.

Borda, L.; Schiller, A.; Zawadowski, A.

2008-11-01

237

Experimental Observation of the Anderson Metal-Insulator Transition with Atomic Matter Waves  

SciTech Connect

We realize experimentally an atom-optics quantum-chaotic system, the quasiperiodic kicked rotor, which is equivalent to a 3D disordered system that allows us to demonstrate the Anderson metal-insulator transition. Sensitive measurements of the atomic wave function and the use of finite-size scaling techniques make it possible to extract both the critical parameters and the critical exponent of the transition, the latter being in good agreement with the value obtained in numerical simulations of the 3D Anderson model.

Chabe, Julien; Szriftgiser, Pascal; Garreau, Jean Claude [Laboratoire de Physique des Lasers, Atomes et Molecules, Universite des Sciences et Technologies de Lille, CNRS, CERLA, F-59655 Villeneuve d'Ascq Cedex (France); Lemarie, Gabriel; Gremaud, Benoit; Delande, Dominique [Laboratoire Kastler-Brossel, Universite Pierre et Marie Curie-Paris 6, ENS, CNRS, 4 Place Jussieu, F-75005 Paris (France)

2008-12-19

238

Observation of the Anderson metal-insulator transition with atomic matter waves: Theory and experiment  

SciTech Connect

Using a cold atomic gas exposed to laser pulses - a realization of the chaotic quasiperiodic kicked rotor with three incommensurate frequencies - we study experimentally and theoretically the Anderson metal-insulator transition in three dimensions. Sensitive measurements of the atomic wave function and the use of finite-size scaling techniques make it possible to unambiguously demonstrate the existence of a quantum phase transition and to measure its critical exponents. By taking proper account of systematic corrections to one-parameter scaling, we show the universality of the critical exponent {nu}=1.59{+-}0.01, which is found to be equal to the one previously computed for the Anderson model.

Lemarie, Gabriel; Delande, Dominique [Laboratoire Kastler Brossel, UPMC-Paris 6, ENS, CNRS, 4 Place Jussieu, F-75005 Paris (France); Chabe, Julien; Szriftgiser, Pascal; Garreau, Jean Claude [Laboratoire PhLAM, , Universite de Lille 1, CNRS, CERLA, F-59655 Villeneuve d'Ascq Cedex (France); Gremaud, Benoit [Laboratoire Kastler Brossel, UPMC-Paris 6, ENS, CNRS, 4 Place Jussieu, F-75005 Paris (France); Centre for Quantum Technologies, National University of Singapore, 3 Science Drive 2, Singapore 117543 (Singapore)

2009-10-15

239

Finite-size effects in Anderson localization of one-dimensional Bose-Einstein condensates  

SciTech Connect

We investigate the disorder-induced localization transition in Bose-Einstein condensates for the Anderson and Aubry-Andre models in the noninteracting limit using exact diagonalization. We show that, in addition to the standard superfluid fraction, other tools such as the entanglement and fidelity can provide clear signatures of the transition. Interestingly, the fidelity exhibits good sensitivity even for small lattices. Effects of the system size on these quantities are analyzed in detail, including the determination of a finite-size-scaling law for the critical disorder strength in the case of the Anderson model.

Cestari, J. C. C.; Foerster, A.; Gusmao, M. A. [Instituto de Fisica, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul (Brazil)

2010-12-15

240

Exciton level structure and dynamics in the CP47 antenna complex of photosystem II  

SciTech Connect

Persistent nonphotochemical and population bottleneck hole-burning results obtained as a function of burn wavelength are reported for the CP47 proximal antenna protein complex of photosystem II. Attention is focused on the lower energy chlorophyll a Q[sub y] states. Results are presented for the CP47 complex from two preparations. The Chl a content per CP47 complex was determined, spectroscopically, to be 14 [+-] 2. On the basis of the analysis of the hole spectra and the 4.2 K static fluorescence spectrum, the lowest energy state of CP47 lies at 690 nm (fluorescence origin at 691 nm). The width of the weak 690-nm absorption band from inhomogeneous broadening is 100 cm[sup [minus]1]. The linear electron-phonon coupling of the 690-nm state is weak with a Huang-Rhys factor (S) of about 0.2 and a mean phonon frequency ([Omega][sub m]) of 120 cm[sup [minus]1], which explains why the Stokes shift (2S[Omega][sub m]) is so small. The 690-nm state is found to be excitonically correlated with a hitherto unobserved state at 687 nm. However, the combined absorption intensity of the 690- and 687-nm states was determined to be equivalent to only 1 Chl a molecule. Results are presented which illustrate that these two states are fragile (i.e., their associated chlorophyll a molecules are disrupted). Thus, it is possible that the correct number of Chl a molecules is 2, not 1. 53 refs., 9 figs., 1 tab.

Chang, H.C.; Jankowiak, R.; Small, G.J. (Ames Lab.-USDOE, IA (United States) Iowa State Univ., Ames, IA (United States)); Yocum, C.F. (Univ. of Michigan, Ann Arbor, MI (United States)); Picorel, R. (CSIC, Zaragoza (Spain) National Renewable Energy Lab., Golden, CO (United States)); Alfonso, M. (CSIC, Zaragoza (Spain)); Seibert, M. (National Renewable Energy Lab., Golden, CO (United States))

1994-08-04

241

Taking fatigue seriously, II: variability in fatigue levels in cancer patients.  

PubMed

Fatigue is a common and distressing complaint of cancer patients. It is typically measured with symptom inventories that reflect the patient's experience over the previous days or weeks. This study examined short-term variation in fatigue levels in a heterogeneous group of cancer patients over a 3-day period to examine the feasibility of such repeated assessments and to characterize the extent and pattern of fatigue symptoms in cancer patients. Thirty-four cancer outpatients with diverse malignancies wore a prototype fatigue watch monitor for three consecutive 24-hour periods and provided fatigue ratings every hour while awake for the 3 days. Patients completed an average of 40 self-reports over 72 hours. These reports revealed a diurnal variation in fatigue, with increasing levels in the evening. The reports also revealed considerable differences across individuals and within individuals in terms of fatigue ratings. Multiple ratings of fatigue within short periods of time can be obtained and reveal that fatigue levels are quite variable, even within an individual. Cancer patients experience their fatigue as "moderate to extreme" 33% of the time. PMID:17478594

Dimsdale, Joel E; Ancoli-Israel, Sonia; Ayalon, Liat; Elsmore, Timothy F; Gruen, William

242

Basic Goals for Elementary Children: Volume I, Beginners Level and Level One; Volume II, Levels Two and Three; Volume III, Levels Four, Five and Six; Volume IV, Levels Seven and Eight.  

ERIC Educational Resources Information Center

These curriculum guides were developed by the Bureau of Indian Affairs to be used by teachers and administrators of Indian students from the beginning level through the eighth. The four volumes provide a structuring and sequencing of themes and concepts designed to prepare Indian children to compete favorably with their peers in other school…

Bureau of Indian Affairs (Dept. of Interior), Washington, DC.

243

US EPA, Pesticide Product Label, THE ANDERSONS 0.2% ...  

EPA Pesticide Factsheets

... _ _ ~~~~W;ltfy~~r~J~~~~~c\\r~N~O~B;~~~~1I{I ...

2011-04-21

244

US EPA, Pesticide Product Label, ANDERSON'S WEED AND ...  

EPA Pesticide Factsheets

... tlo. ... V'/r.lp CIJ(I!::UV-f II ...

2011-04-21

245

10 CFR 8.2 - Interpretation of Price-Anderson Act, section 170 of the Atomic Energy Act of 1954.  

Code of Federal Regulations, 2010 CFR

...Price-Anderson Act, section 170 of the Atomic Energy Act of 1954. 8.2 Section...Price-Anderson Act, section 170 of the Atomic Energy Act of 1954. (a) It is my...indemnity agreement entered into by the Atomic Energy Commission under the...

2009-01-01

246

10 CFR 8.2 - Interpretation of Price-Anderson Act, section 170 of the Atomic Energy Act of 1954.  

Code of Federal Regulations, 2010 CFR

...Price-Anderson Act, section 170 of the Atomic Energy Act of 1954. 8.2 Section...Price-Anderson Act, section 170 of the Atomic Energy Act of 1954. (a) It is my...indemnity agreement entered into by the Atomic Energy Commission under the...

2010-01-01

247

Frontal Plane Motion of the Pelvis and Hip during Gait Stance Discriminates Children with Diplegia Levels I and II of the GMFCS  

PubMed Central

Objective. To determine if gait waveform could discriminate children with diplegic cerebral palsy of the GMFCS levels I and II. Patients. Twenty-two children with diplegia, 11 classified as level I and 11 as level II of the GMFCS, aged 7 to 12 years. Methods. Gait kinematics included angular displacement of the pelvis and lower limb joints during the stance phase. Principal components (PCs) analyses followed by discriminant analysis were conducted. Results. PC1s of the pelvis and hip in the frontal plane differ significantly between groups and captured 80.5% and 86.1% of the variance, respectively. PC1s captured the magnitude of the pelvic obliquity and hip adduction angle during the stance phase. Children GMFCS level II walked with reduced pelvic obliquity and hip adduction angles, and these variables could discriminate the groups with a cross-validation of 95.5%. Conclusion. Reduced pelvic obliquity and hip adduction were observed between children GMFCS level II compared to level I. These results could help the classification process of mild-to-moderate children with diplegia. In addition, it highlights the importance of rehabilitation programs designed to improve pelvic and hip mobility in the frontal plane of diplegic cerebral palsy children level II of the GMFCS.

Kirkwood, Renata Noce; Franco, Rosa de Lourdes Lima Dias; Furtado, Sheyla Cavalcanti; Barela, Ana Maria Forti; Deluzio, Kevin John; Mancini, Marisa Cotta

2012-01-01

248

Low-Level Laser Irradiation Stimulates Tenocyte Migration with Up-Regulation of Dynamin II Expression  

PubMed Central

Low-level laser therapy (LLLT) is commonly used to treat sports-related tendinopathy or tendon injury. Tendon healing requires tenocyte migration to the repair site, followed by proliferation and synthesis of the extracellular matrix. This study was designed to determine the effect of laser on tenocyte migration. Furthermore, the correlation between this effect and expression of dynamin 2, a positive regulator of cell motility, was also investigated. Tenocytes intrinsic to rat Achilles tendon were treated with low-level laser (660 nm with energy density at 1.0, 1.5, and 2.0 J/cm2). Tenocyte migration was evaluated by an in vitro wound healing model and by transwell filter migration assay. The messenger RNA (mRNA) and protein expressions of dynamin 2 were determined by reverse transcription/real-time polymerase chain reaction (real-time PCR) and Western blot analysis respectively. Immunofluorescence staining was used to evaluate the dynamin 2 expression in tenocytes. Tenocytes with or without laser irradiation was treated with dynasore, a dynamin competitor and then underwent transwell filter migration assay. In vitro wound model revealed that more tenocytes with laser irradiation migrated across the wound border to the cell-free zone. Transwell filter migration assay confirmed that tenocyte migration was enhanced dose-dependently by laser. Real-time PCR and Western-blot analysis demonstrated that mRNA and protein expressions of dynamin 2 were up-regulated by laser irradiation dose-dependently. Confocal microscopy showed that laser enhanced the expression of dynamin 2 in cytoplasm of tenocytes. The stimulation effect of laser on tenocytes migration was suppressed by dynasore. In conclusion, low-level laser irradiation stimulates tenocyte migration in a process that is mediated by up-regulation of dynamin 2, which can be suppressed by dynasore.

Tsai, Wen-Chung; Hsu, Chih-Chin; Pang, Jong-Hwei S.; Lin, Miao-Sui; Chen, Ying-Hsun; Liang, Fang-Chen

2012-01-01

249

Post-processing V&V level II ASC milestone (2360) results.  

SciTech Connect

The 9/30/2007 ASC Level 2 Post-Processing V&V Milestone (Milestone 2360) contains functionality required by the user community for certain verification and validation tasks. These capabilities include loading of edge and face data on an Exodus mesh, run-time computation of an exact solution to a verification problem, delivery of results data from the server to the client, computation of an integral-based error metric, simultaneous loading of simulation and test data, and comparison of that data using visual and quantitative methods. The capabilities were tested extensively by performing a typical ALEGRA HEDP verification task. In addition, a number of stretch criteria were met including completion of a verification task on a 13 million element mesh.

Chavez, Elmer; Karelitz, David B.; Brunner, Thomas A.; Trucano, Timothy Guy; Moreland, Kenneth D.; Weirs, V. Gregory; Shead, Timothy M.

2007-09-01

250

Modular data and Verlinde formulae for fractional level WZW models II  

NASA Astrophysics Data System (ADS)

This article gives a complete account of the modular properties and Verlinde formula for conformal field theories based on the affine Kac-Moody algebra slˆ(2) at an arbitrary admissible level k. Starting from spectral flow and the structure theory of relaxed highest weight modules, characters are computed and modular transformations are derived for every irreducible admissible module. The culmination is the application of a continuous version of the Verlinde formula to deduce non-negative integer structure coefficients which are identified with Grothendieck fusion coefficients. The Grothendieck fusion rules are determined explicitly. These rules reproduce the well-known "fusion rules" of Koh and Sorba, negative coefficients included, upon quotienting the Grothendieck fusion ring by a certain ideal.

Creutzig, Thomas; Ridout, David

2013-10-01

251

Three short-period, transiting exoplanets (Anderson+, 2012)  

NASA Astrophysics Data System (ADS)

We report the discovery of three extrasolar planets that transit their moderately bright (mV=12-13) host stars. WASP-44b is a 0.89-MJup planet in a 2.42-day orbit around a G8V star. WASP-45b is a 1.03-MJup planet which passes in front of the limb of its K2V host star every 3.13-days. Weak CaII H&K emission seen in the spectra of WASP-45 suggests that the star is chromospherically active. WASP-46b is a 2.10-MJup planet in a 1.43-day orbit around a G6V star. Rotational modulation of the light curves of WASP-46 and weak CaII H&K emission in its spectra show the star to be photospherically and chromospherically active. (3 data files).

Anderson, D. R.; Collier, Cameron A.; Gillon, M.; Hellier, C.; Jehin, E.; Lendl, M.; Maxted, P. F. L.; Queloz, D.; Smalley, B.; Smith, A. M. S.; Triaud, A. H. M. J.; West, R. G.; Pepe, F.; Pollacco, D.; Segransan, D.; Todd, I.; Udry, S.

2013-01-01

252

NRG study of a generalized Anderson impurity model with non Fermi liquid fixed point.  

NASA Astrophysics Data System (ADS)

We study with the Wilson numerical renormalization group method the phase diagram of a twofold orbitally degenerate doubly occupied Anderson impurity model. Strikingly, the model presents a non-trivial fixed point, similar to that of the two-impurity Kondo problem, which separates a Kondo-screened regime from a Kondo-unscreened one. This novel fixed point is even more robust than that, since it can only be destabilized by orbital or gauge symmetry breaking. We calculate the impurity spectral function (DOS) which shows quite an interesting behavior across the fixed point. In the Kondo screened regime and close to the fixed point the DOS displays, riding on top of a broader peak, a very narrow resonance at the Fermi level. The resonance shrinks upon approaching the fixed point, and finally disappears at the fixed point. Beyond that, in the Kondo-unscreened regime, the narrow resonance is now replaced by a narrow pseudogap gradually opening up. The doubly occupied model has electron-hole symmetry; however the novel fixed point exists even without that symmetry. In general the DOS pseudogap in the Kondo-unscreened regime gets partly filled in, but will still pin the chemical potential. While this impurity model is interesting per se, we are pursuing its use as a tool to understand, via Dynamical Mean Field Theory, the behavior of a strongly correlated lattice model close to the Mott transition. We argue that this lattice model should encounter the non-trivial fixed point just before the Mott transition and react to its instability by spontaneous generation of a superconducting order parameter.

de Leo, Lorenzo; Fabrizio, Michele

2004-03-01

253

Classical Coset Hamiltonian for the Electronic Motion and its Application to Anderson Localization and Hammett Equation  

Microsoft Academic Search

A classical coset Hamiltonian is introduced for the system of one electron in multi-sites. By this Hamiltonian, the dynamical behaviour of the electronic motion can be readily simulated. The simulation reproduces the retardation of the electron density decay in a lattice with site energies randomly distributed - an analogy with Anderson localization. This algorithm is also applied to reproduce the

Guan Xing; Guo-Zhen Wu

2001-01-01

254

Politicizing Young Adult Literature: Reading Anderson's "Speak" as a Critical Text.  

ERIC Educational Resources Information Center

Considers how critical texts confront difficult topics. Argues that students need to read, write, and talk about these relevant issues. Suggests that reading literature can be an ethical as well as an intellectual process, and as such it can assist adolescents in coping with their tumultuous lives. Focuses on Laurie Halse Anderson's novel "Speak."…

Alsup, Janet

2003-01-01

255

Suppression of the virtual anderson transition in the impurity band of doped quantum well structures  

NASA Astrophysics Data System (ADS)

We have previously observed activation-type conductivity with low activation energies of heavily doped p-GaAs/AlGaAs quantum well structures at low temperatures. It has been attributed to the delocalization of the electron states near the maximum of a narrow impurity band in the sense of the Anderson transition. The possibility of this delocalization at a relatively low impurity concentration is associated with the narrowness of the impurity band in the presence of weak disorder. In this case, charge carriers were activated from the tail of the band and their presence was due to the background (weak) compensation. In this work, we study the dependence of the above virtual Anderson transition on the external compensation and impurity concentration. It has been found that an increase in the compensation does not initially affect the Anderson transition; however, at a higher compensation, it leads to the suppression of the transition owing to the growing disorder. An increase in the impurity concentration also initially leads to the suppression of the Anderson transition due to the disorder associated with the partial overlap of the Hubbard bands. However, the conductivity becomes metallic at a fairly high concentration due to the Mott transition.

Agrinskaya, N. V.; Kozub, V. I.; Poloskin, D. S.

2011-09-01

256

Adolescent Identities and Sexual Behavior: An Examination of Anderson's Player Hypothesis  

ERIC Educational Resources Information Center

|We investigate the social and behavioral characteristics of male adolescents who self-identify as players, focusing particularly on Anderson's claim that this social role is inextricably linked with poverty and minority status. Results indicate that black respondents, those affiliated with liberal peers and young men who initially report a…

Giordano, Peggy C.; Longmore, Monica A.; Manning, Wendy D.; Northcutt, Miriam J.

2009-01-01

257

The Effects of the Mean-Field Interaction on the Anderson Localization of Graphene Nanoribbons  

NASA Astrophysics Data System (ADS)

A generalized tight-binding (TB) model,footnotetextHancock et al. PRB 81, 245402 (2010). which includes a mean-field Hubbard-U and up to 3rd nearest-neighbor hopping terms, is applied to edge-disordered zigzag graphene nanoribbons in order to study spin-transport within the Landauer-B"utticker formalism. Edge-disorder is modeled by random perturbation of the on-site energy in the range -E..E on all edge atoms, and the resulting Anderson localization lengths determined. We compared the Anderson localization lengths and spin-transport features obtained from the generalized model, an extended TB model (non-interacting) and the simplified TB model (1st nearest neighbor hopping only). Within the range ±E=0.5 eV the Anderson localization length for a single spin was found to decrease by 86.4% with the introduction of the Hubbard-U in the generalized model compared to the non-interacting models, whereas the opposite spin remained unchanged across all model types. For the range ±E=2.0 eV the Anderson localization length for both spin types decreased by 71.4% and 76.2% in the generalized model when compared to the extended TB model, and 76.5% and 80.4% when compared to the simplified TB model.

Baldwin, Jack; Hancock, Y.

2013-03-01

258

Upper Critical Field and Critical Temperature for Superconducting Alloys Described by the Anderson Model.  

National Technical Information Service (NTIS)

Extending some recent work by H. Shiba the authors have used the Hartree-Fock approximation for the Anderson Model of localized impurity electron states in a superconductor to obtain expressions for the critical temperature in zero magnetic field and for ...

G. B. Arnold

1974-01-01

259

MD Anderson-led preclinical research shows normal gene hinders breast cancer chemotherapy  

Cancer.gov

Presence of normal p53, a tumor suppressor gene, instead of a mutated version, makes breast cancer chemotherapy with doxorubicin less effective. The preclinical study led by MD Anderson scientists was published today in the journal Cancer Cell. The research, which challenges the existing paradigm, is another step closer to personalized cancer medicine for breast cancer.

260

MD Anderson researchers find that chemotherapy is as effective before breast cancer surgery as after  

Cancer.gov

Whether chemotherapy is given before or after breast-conserving therapy does not have an impact on long-term local-regional outcomes, suggesting treatment success is due more to biologic factors than chemotherapy timing, according to a study by researchers at The University of Texas MD Anderson Cancer Center.

261

The Uses of Practitioner Research and Status Issues in Educational Research: Reply to Gary Anderson.  

ERIC Educational Resources Information Center

Critiques Anderson's response to the theme issue, "Research for Doctoral Students in Education," asserting that questions he raises have few straightforward answers. Agrees that because efforts to study and improve educational practice too often impose abstract findings on school and teachers, it is important to develop a literature based in…

Metz, Mary Haywood; Page, Reba N.

2002-01-01

262

Wildlife Impact Assessment Anderson Ranch, Black Canyon, and Boise Diversion Projects, Idaho. Final Report.  

National Technical Information Service (NTIS)

This report presents an analysis of impacts on wildlife and their habitats as a result of construction and operation of the US Bureau of Reclamation's Anderson Ranch, Black Canyon, and Boise Diversion Projects in Idaho. The objectives were to: (1) determi...

B. Martin K. Ablin-Stone

1986-01-01

263

Ferromagnetism and Kondo Insulator Behavior in the Disordered Periodic Anderson Model  

Microsoft Academic Search

The effect of binary alloy disorder on the ferromagnetic phases of f-electron materials is studied within the periodic Anderson model. We find that disorder in the conduction band can drastically enhance the Curie temperature Tc due to an increase of the local f moment. The effect may be explained qualitatively and even quantitatively by a simple theoretical ansatz. The emergence

Unjong Yu; Krzysztof Byczuk; Dieter Vollhardt

2008-01-01

264

Community of Inquiry in e-Learning: A Critical Analysis of the Garrison and Anderson Model  

ERIC Educational Resources Information Center

This article is based on a constructively critical analysis of the "community of inquiry" model developed by Garrison and Anderson (2003) as part of their "e-learning" research. The authors claim that certain collaborative interactions create "distant presence" fostering the emergence of a "community of inquiry" which has a positive influence on…

Jezegou, Annie

2010-01-01

265

The Weak Localization for the Alloy-Type Anderson Model on a Cubic Lattice  

NASA Astrophysics Data System (ADS)

We consider alloy type random Schrödinger operators on a cubic lattice whose randomness is generated by the sign-indefinite single-site potential. We derive Anderson localization for this class of models in the Lifshitz tails regime, i.e. when the coupling parameter ? is small, for the energies E?- C? 2.

Cao, Zhenwei; Elgart, Alexander

2012-09-01

266

Approximation of modified Anderson-Darling test statistics for extreme value distributions with unknown shape parameter  

NASA Astrophysics Data System (ADS)

Critical values for the modified Anderson-Darling test statistics are newly derived.Regression equations of test statistics for several distributions were suggested.A power study was performed to compare the efficiency of the goodness-of-fit tests.

Heo, Jun-Haeng; Shin, Hongjoon; Nam, Woosung; Om, Juseong; Jeong, Changsam

2013-08-01

267

On Planetary Evolution and the Evolution of Planetary Science During the Career of Don Anderson  

Microsoft Academic Search

The planets of our solar system have long been viewed by Don Anderson as laboratories for testing general aspects of planetary evolution and as points of comparison to the Earth. I was fortunate to have been a student 39 years ago in a course at Caltech that Don taught with Bob Kovach on the interiors of the Earth and the

S. C. Solomon

2003-01-01

268

MD Anderson study finds side effects, complications, and mastectomy are more likely after partial breast irradiation:  

Cancer.gov

Accelerated partial breast irradiation (APBI) brachytherapy, the localized form of radiation therapy growing increasingly popular as a treatment choice for women with early-stage breast cancer, is associated with higher rate of later mastectomy, increased radiation-related toxicities and post-operative complications, compared to traditional whole breast irradiation (WBI), according to researchers from The University of Texas MD Anderson Cancer Center.

269

Anderson v. University of Wisconsin: Handicap and Race Discrimination in Readmission Procedures.  

ERIC Educational Resources Information Center

"Anderson v. University of Wisconsin" gives important guidance to universities by detailing the components of race and handicap discrimination claims, and illustrating how these claims can succeed. Readmission procedures that could reduce the likelihood of charges of discrimination are suggested. (Author/MLW)

Smith, Elizabeth R.

1989-01-01

270

The effect of the exhaustion on the magnetic and optical properties of the periodic Anderson model  

Microsoft Academic Search

We are interested in the study of the “exhaustion problem”, as originally introduced by Nozières, in the Kondo regime, and its manifestations on the magnetic and optical properties of the periodic Anderson model (PAM). In the case of the impurity problem there is only one single energy scale governed by the Kondo temperature TK, below which the local moment is

M. S. Figueira; J. Silva-Valencia; R. Franco

2008-01-01

271

UT MD Anderson study finds advances in breast cancer don't extend to older women:  

Cancer.gov

The survival rates for older women with breast cancer lag behind younger women diagnosed with the disease, indicating that the elder population may be missing out on improvements in treatment and detection, according to new research from The University of Texas MD Anderson Cancer Center.

272

MD Anderson study finds inflammatory mediator promotes colorectal cancer by stifling protective genes:  

Cancer.gov

Chronic inflammation combines with DNA methylation, a process that shuts down cancer-fighting genes, to promote development of colorectal cancer, scientists at The University of Texas MD Anderson Cancer Center report today in the advance online publication of the journal Nature Medicine.

273

Exact expression of the ground-state energy for the symmetric anderson model  

NASA Astrophysics Data System (ADS)

The exact expression of the ground-state energy for the symmetric Anderson model is obtained with the use of the Wiegmann approach. It is found that some of the quasi-momenta appearing in Wiegmann's paper are necessarily complex to obtain the expression of the ground-state energy.

Kawakami, Norio; Okiji, Ayao

1981-12-01

274

MD Anderson develops prognostic model for MDS related to prior cancer therapy  

Cancer.gov

A large-scale analysis of patients whose myelodysplastic syndrome is related to earlier cancer treatment overturns the notion that all of them have a poor prognosis, researchers from the University of Texas MD Anderson Cancer Center report at the 53rd Annual Meeting of the American Society of Hematology.

275

Finding Order in Chaos: Complexity in the Career of Don L Anderson  

Microsoft Academic Search

Don Anderson's career has been marked by a long standing interest in plate tectonics and the earth's interior. But from time to time, he has departed from these major themes to investigate related topics. For example, during the 1970's, he proposed several seminal ideas, such as the applicability of cracks and fracture theory to earthquakes, and the idea of accelerated

P. Rundle; J. Rundle; W. Klein

2003-01-01

276

MD Anderson-led study finds two targeted therapies act against Ewing's sarcoma tumors  

Cancer.gov

A pair of targeted therapies shrank tumors in some patients with treatment-resistant Ewing's sarcoma or desmoplastic small-round-cell tumors, according to research led by investigators from The University of Texas MD Anderson Cancer Center reported at the American Association for Cancer Research Annual Meeting 2012.

277

Enzyme replacement therapy in Anderson-Fabry's disease: beneficial clinical effect on vital organ function  

Microsoft Academic Search

Two recent randomized trials pointed out the bene- ficial effect of enzyme replacement therapy on bio- chemical parameters in patients with Anderson-Fabry's disease. Clinical end-points, such as amelioration or stabilization of renal function deterioration, or improve- ment of left ventricular hypertrophy have not been evaluated in depth. We report the case of a patient whose moderately impaired renal function was

Dominique Chauveau; Jean-Pierre Grunfeld

278

The Level and Nature of Autistic Intelligence II: What about Asperger Syndrome?  

PubMed Central

A distinctively uneven profile of intelligence is a feature of the autistic spectrum. Within the spectrum, Asperger individuals differ from autistics in their early speech development and in being less likely to be characterized by visuospatial peaks. While different specific strengths characterize different autistic spectrum subgroups, all such peaks of ability have been interpreted as deficits: isolated, aberrant, and irreconcilable with real human intelligence. This view has recently been challenged by findings of autistic strengths in performance on Raven's Progressive Matrices (RPM), an important marker of general and fluid intelligence. We investigated whether these findings extend to Asperger syndrome, an autistic spectrum subgroup characterized by verbal peaks of ability, and whether the cognitive mechanisms underlying autistic and Asperger RPM performance differ. Thirty-two Asperger adults displayed a significant advantage on RPM over Wechsler Full-Scale and Performance scores relative to their typical controls, while in 25 Asperger children an RPM advantage was found over Wechsler Performance scores only. As previously found with autistics, Asperger children and adults achieved RPM scores at a level reflecting their Wechsler peaks of ability. Therefore, strengths in RPM performance span the autistic spectrum and imply a common mechanism advantageously applied to different facets of cognition. Autistic spectrum intelligence is atypical, but also genuine, general, and underestimated.

Soulieres, Isabelle; Dawson, Michelle; Gernsbacher, Morton Ann; Mottron, Laurent

2011-01-01

279

In situ determination of manganese(II) speciation in Deinococcus radiodurans by high magnetic field EPR: detection of high levels of Mn(II) bound to proteins.  

PubMed

High magnetic field high frequency electron paramagnetic resonance techniques were used to measure in situ Mn(II) speciation in Deinococcus radiodurans, a radiation-resistant bacteria capable of accumulating high concentrations of Mn(II). It was possible to identify and quantify the evolution of Mn(II) species in intact cells at various stages of growth. Aside from water, 95-GHz high field electron nuclear double resonance showed that the Mn(II) ions are bound to histidines and phosphate groups, mostly from fructose-1,6-bisphosphate but also inorganic phosphates and nucleotides. During stationary growth phase, 285-GHz continuous wave EPR measurements showed that histidine is the most common ligand to Mn(II) and that significant amounts of cellular Mn(II) in D. radiodurans are bound to peptides and proteins. As much as 40% of the total Mn(II) was in manganese superoxide dismutase, and it is this protein and not smaller manganese complexes, as has been suggested recently, that is probably the primary defense against superoxide. PMID:23303180

Tabares, Leandro C; Un, Sun

2013-01-09

280

Effects of Dietary Salt Load and Salt Depletion on the Course of Hypertension and Angiotensin II Levels in Male and Female Heterozygous Ren2 Transgenic Rats  

Microsoft Academic Search

Background: In the present study we evaluated plasma and kidney angiotensin II (ANG II) levels in female and male Ren-2 transgenic rats (TGR) in comparison to age-matched female and male normotensive Hannover Sprague-Dawley rats. Methods: The rats were maintained on a normal sodium (NS) diet (0.6% NaCl) or fed a high sodium (HS) diet (2% NaCl) for 4 days or

Zuzana Husková; Herbert J. Kramer; Monika Thumová; Jan Malý; Petra Škaroupková; Alexander Kolský; Zdena Vernerová

2007-01-01

281

Angiotensin 1-7 Receptor and Angiotensin II Receptor 2 Blockades Prevent the Increased Serum and Kidney Nitric Oxide Levels in Response to Angiotensin II Administration: Gender-Related Difference  

PubMed Central

Background: The angiotensin II (Ang II) receptor 2 (AT2R) and angiotensin 1-7 receptor (masR) expression in the kidney are gender-related. We attempted to compare the response of nitric oxide (NO) production to Ang II administration, with and without AT2R and masR blockades, using A-779 and PD123319 in male and female rats. Methods: Anesthetized and catheterized male and female Wistar rats were subjected to one-hour continuous infusion of Ang II (~20 ?g/kg/hour), with and without masR and AT2R blockades. The level of the NO metabolite (nitrite) was measured before and after the experiment in rat serum and in the homogenized kidney tissue. Results: The basal data indicated that no sex difference in the serum level of nitrite could be detected before Ang II infusion. However, administration of Ang II in male and female rats caused a gender difference in the nitrite level, which resulted in the serum level of the nitrite significantly increasing in males (P < 0.05) when compared with the females. In addition, masR blockade or co-blockade of masR and AT2R in male rats abolished the gender difference related to the effect of Ang II on nitrite production. In the presence of masR and AT2R, or when masR alone was blocked, the level of nitrite in the kidney, in response to the Ang II infusion was not significantly different between the two sexes. On the contrary, masR and AT2R co-blockades significantly decreased the kidney nitrite concentration response to Ang II administration in both male and female rats (P < 0.05), but no sex difference was detected. Conclusions: The renal vasculature of male rats may provide more response to Ang II administration-induced NO, which is dependent on masR and AT2R. During dual masR + AT2R blockades, the kidney NO formation wasreduced in a non-gender related manner.

Safari, Tahereh; Nematbakhsh, Mehdi

2013-01-01

282

Wildlife Protection, Mitigation, and Enhancement Plans, Anderson Ranch and Black Canyon Facilities: Final Report.  

SciTech Connect

Under direction of the Pacific Northwest Electric Power Planning and Conservation Act of 1980, and the subsequent Northwest Power Planning Council's Columbia River Basin Fish and Wildlife Program, projects have been developed in Idaho to mitigate the impacts to wildlife habitat and production due to the development and operation of the Anderson Ranch and Black Canyon Facilities (i.e., dam, power plant, and reservoir areas). The Anderson Ranch Facility covered about 4812 acres of wildlife habitat while the Black Canyon Facility covered about 1115 acres. These acreages include dam and power plant staging areas. A separate mitigation plan has been developed for each facility. A modified Habitat Evaluation Procedure (HEP) was used to assess the benefits of the mitigation plans to wildlife. The interagency work group used the target species Habitat Units (HU's) lost at each facility as a guideline during the mitigation planning process, while considering the needs of wildlife in the areas. Totals of 9619 and 2238 target species HU's were estimated to be lost in the Anderson Ranch and Black Canyon Facility areas, respectively. Through a series of projects, the mitigation plans will provide benefits of 9620 target species HU's to replace Anderson Ranch wildlife impacts and benefits of 2195 target species HU's to replace Black Canyon wildlife impacts. Target species to be benefited by the Anderson Ranch and/or Black Canyon mitigation plans include the mallard, Canada goose, mink, yellow warbler, black-capped chickadee, ruffed grouse, mule deer, blue grouse, sharp-tailed grouse, ring-necked pheasant, and peregrine falcon.

Meuleman, G. Allyn

1987-06-01

283

Photosystem II Assembly in CP47 Mutant of Synechocystis sp. PCC 6803 Is Dependent on the Level of Chlorophyll Precursors  

Microsoft Academic Search

Accumulation of chlorophyll and expression of the chlorophyll (Chl)-binding CP47 protein that serves as the core antenna of photosystem II are indispensable for the assembly of a functional photosystem II. We have characterized the CP47 mutant with an impaired photo- system II assembly and its two spontaneous pseudo- revertants with their much improved photoautotrophic growth. The complementing mutations in these

Roman Sobotka; Josef Komenda; Ladislav Bumba; Martin Tichy

2005-01-01

284

KGF Increases SPA and SPD mRNA Levels and Secretion in Cultured Rat Alveolar Type II Cells  

Microsoft Academic Search

Studies of secretion of surfactant proteins by alveolar type II cells have been limited because the expres- sion of the genes for these proteins decreases rapidly in primary culture. We developed a culture system to investigate the regulation of lipid and protein secretion by alveolar type II cells and the genes involved in these processes. Rat type II cells were

Colorado Denver

285

Anderson's disease/chylomicron retention disease in a Japanese patient with uniparental disomy 7 and a normal SAR1B gene protein coding sequence  

PubMed Central

Background Anderson's Disease (AD)/Chylomicron Retention Disease (CMRD) is a rare hereditary hypocholesterolemic disorder characterized by a malabsorption syndrome with steatorrhea, failure to thrive and the absence of chylomicrons and apolipoprotein B48 post-prandially. All patients studied to date exhibit a mutation in the SAR1B gene, which codes for an essential component of the vesicular coat protein complex II (COPII) necessary for endoplasmic reticulum to Golgi transport. We describe here a patient with AD/CMRD, a normal SAR1B gene protein coding sequence and maternal uniparental disomy of chromosome 7 (matUPD7). Methods and Results The patient, one of two siblings of a Japanese family, had diarrhea and steatorrhea beginning at five months of age. There was a white duodenal mucosa upon endoscopy. Light and electron microscopy showed that the intestinal villi were normal but that they had lipid laden enterocytes containing accumulations of lipid droplets in the cytoplasm and lipoprotein-size particles in membrane bound structures. Although there were decreased amounts in plasma of total- and low-density lipoprotein cholesterol, apolipoproteins AI and B and vitamin E levels, the triglycerides were normal, typical of AD/CMRD. The presence of low density lipoproteins and apolipoprotein B in the plasma, although in decreased amounts, ruled out abetalipoproteinemia. The parents were asymptomatic with normal plasma cholesterol levels suggesting a recessive disorder and ruling out familial hypobetalipoproteinemia. Sequencing of genomic DNA showed that the 8 exons of the SAR1B gene were normal. Whole genome SNP analysis and karyotyping revealed matUPD7 with a normal karyotype. In contrast to other cases of AD/CMRD which have shown catch-up growth following vitamin supplementation and a fat restricted diet, our patient exhibits continued growth delay and other aspects of the matUPD7 and Silver-Russell Syndrome phenotypes. Conclusions This patient with AD/CMRD has a normal SAR1B gene protein coding sequence which suggests that factors other than the SAR1B protein may be crucial for chylomicron secretion. Further, this patient exhibits matUPD7 with regions of homozygosity which might be useful for elucidating the molecular basis of the defect(s) in this individual. The results provide novel insights into the relation between phenotype and genotype in these diseases and for the mechanisms of secretion in the intestine.

2011-01-01

286

Detection of Low-Level Activities in Solar-Analog Stars from Emission Strengths of the Ca II 3934 Line  

NASA Astrophysics Data System (ADS)

Activity studies of solar-type stars, especially with reference to the status of our current Sun among them, have exposed the importance of (1) homogeneously selecting the sample stars and (2) reliably evaluating their activities down to a considerably low level. Motivated by these requirements, we conducted an extensive study on the activities of 118 solar-analog stars (of sufficiently similar properties to each other) by measuring the emission strength at the core of Ca II 3933.663 line (K line) on the high-dispersion spectrogram obtained by Subaru/HDS, where special attention was paid to correctly detecting the chromospheric emission by removing the wing-fitted photospheric profile calculated from the classical solar model atmosphere. This enabled us to detect low-level activities down to logR' ˜ -5.4 (R' is the ratio of the chromospheric core emission flux to the total bolometric flux), by which we could detect subtle activity differences that were indiscernible in previous studies. Regarding the Sun, we found logR'? = -5.33 near to the low end of the distribution, which means that it belongs to the distinctly low-activity group among solar analogs. This excludes the once-suggested possibility for the high frequency of Maunder-minimum stars showing appreciably lower activities than the minimum-Sun.

Takeda, Yoichi; Tajitsu, Akito; Honda, Satoshi; Kawanomoto, Satoshi; Ando, Hiroyasu; Sakurai, Takashi

2012-12-01

287

Experimental and analytical study of loss-of-flow transients in EBR-II occurring at decay power levels  

SciTech Connect

A series of eight loss-of-flow (LOF) tests have been conducted in EBR-II to study the transition between forced and natural convective flows following a variety of loss-of-primary-pumping power conditions from decay heat levels. Comparisons of measurements and pretest/posttest predictions were made on a selected test. Good agreements between measurements and predictions was found prior to and just after the flow reaching its minimum, but the agreement is not as good after that point. The temperatures are consistent with the flow response and the assumed decay power. The measured results indicate that the flows of driver and the instrumented subassemblies are too much in the analytical model in the natural convective region. Although a parametric study on secondary flow, turbulent-laminar flow transition, heat transfer ability of the intermediate heat exchange at low flow and flow mixing in the primary tank has been performed to determine their effects on the flow, the cause of the discrepancy at very low flow level is still unknown.

Chang, L.K.; Mohr, D.; Feldman, E.E.; Betten, P.R.; Planchon, H.P.

1985-01-01

288

Halo jacket in odontoid fractures type II and III  

Microsoft Academic Search

The treatment of odontoid fractures remains controversial. The late results of 14 patients with Anderson D'Alonzo type II and III treated with halo jacket from 1995 to 1999 are presented. The fractures were reduced under image intensifier and stabilized by halo jacket. The immobilization period was 12 weeks. After 1 year, the fracture was roentgenologically consolidated in 12 out of

Radko Komadina; Drago Brilej; Miloš Kosanovi?; Miodrag Vlaovi?

2003-01-01

289

Energy-Level and Wave-Function Statistics in the Anderson Model of Localization  

Microsoft Academic Search

Universal aspects of correlations in the spectra and wave functions of closed, complex quantum systems can be described by\\u000a random-matrix theory (RMT) [1]. On small energy scales, for example, the eigenvalues, eigenfunctions and matrix elements of\\u000a disordered quantum systems in the metallic regime [2] or those of classically chaotic quantum systems [3] exhibit universal\\u000a statistical properties very well described by

Bernhard Mehlig; Michael Schreiber

290

Level II Cultural Resource investigation for the Texoma Distribution Enhancements project, Cameron and Calcasieu Parishes, Louisiana: Final report  

SciTech Connect

A Level II Cultural Resource Survey was completed for the Texoma Distribution Enhancements project, located in Cameron and Calcasieu Parishes, Louisiana. The 13-mile pipeline extends from Strategic Petroleum Reserve No. 3 to a terminus near Vincent Landing. Located in Louisiana's southwest coastal zone, the pipeline will traverse extensive marsh lands as well as upland prairie terrace areas. Present land use within the project area consists primarily of undeveloped marsh land and cattle range. The study methods included background research, intensive pedestrian survey with systematic shovel testing, a boat survey, and laboratory analysis of recovered artifact collections. One historic site, 16CU205, was identified during the field survey, and it was tested for National Register eligibility. The site is assignable to the Industrialization and Modernization (1890-1940) Cultural Unit. Archaeological testing indicates that it is a rural residence or farmstead, with a house and one outbuilding within the proposed right-of-way. The site lacks significant historical association and sufficient archaeological integrity to merit inclusion on the National Register of Historic Places. Four standing structures were also identified during the field survey. The structures are agricultural outbuildings, less than 40 years in age, that possess no architectural distinction or historical association. They have been documented photographically and by scaled plan drawings, but do not merit additional study prior to their destruction. 24 refs., 15 figs., 3 tabs.

LeeDecker, C. H.; Holland, C. C.

1987-10-01

291

Effects of a high-selenium yeast supplement on celecoxib plasma levels: a randomized phase II trial.  

PubMed

A combination of celecoxib and selenium was used in a randomized double-blind Phase II trial as a preliminary study to a multicenter Phase III colorectal cancer chemoprevention trial using these two agents together. The purpose of this trial was to determine whether high-selenium baker's yeast [(Saccharomyces cerevisiae) 200 microg once daily] in combination with celecoxib (400 mg once daily) altered the steady-state plasma concentration of celecoxib or produced clinically significant toxicities. Seventy-three healthy subjects (ages 40-75 years) were recruited to the 6-week study from the general local population and were randomized to either the celecoxib plus selenized baker's yeast group or the celecoxib plus placebo group after a 2-week run in period of celecoxib only. Blood samples were taken at baseline (to document that there was no evidence of celecoxib intake), after the 2-week run-in period on celecoxib to verify steady-state blood levels of this agent, and at end of study (4 weeks postrandomization). Toxicities were monitored at 2 weeks after initiation of celecoxib, at 4 weeks after initiation, and at the end of the study. Blood level concentrations of celecoxib did not differ between the two groups as determined by high-performance liquid chromatography analysis nor were there significant differences in blood chemistry values between the two groups. Subjects' self-report of general physical toxicities was uncommon and limited to National Cancer Institute toxicity grade 2 or less; however, 2 female participants (3%) were removed from the study medications because of grade 2 edema and significant weight gain after 2 and 2.5 weeks of celecoxib administration. In conclusion, high-selenium yeast and celecoxib can be taken at the described doses with minimum short-term negative effects. In future Phase III chemoprevention trials of celecoxib, weight gain should be carefully monitored, and participants should be made aware of this potential side effect before study entry. PMID:14973093

Frank, Denise H; Roe, Denise J; Chow, H-H Sherry; Guillen, Jose M; Choquette, Karin; Gracie, Debra; Francis, Jennifer; Fish, Airley; Alberts, David S

2004-02-01

292

Subradiant hybrid states in the open 3D Anderson-Dicke model  

NASA Astrophysics Data System (ADS)

Anderson localization is a paradigmatic coherence effect in disordered systems, often analyzed in the absence of dissipation. Here we consider the case of coherent dissipation, occurring for open system with coupling to a common decay channel. This dissipation induces cooperative Dicke super- and subradiance and an effective long-range hopping, expected to destroy Anderson localization. We are thus in the presence of two competing effects, i.e. localization driven by disorder and delocalization driven by dissipative opening. Here we demonstrate the existence of a subradiant hybrid regime, emerging from the interplay of opening and disorder, in which subradiant states are hybrid with both features of localized and extended states, while superradiant states are extended. We also provide analytical predictions for this regime, confirmed by numerical simulations.

Biella, A.; Borgonovi, F.; Kaiser, R.; Celardo, G. L.

2013-09-01

293

Renormalization-group approach to spectral properties of the two-channel Anderson impurity model  

NASA Astrophysics Data System (ADS)

The impurity Green function and dynamical susceptibilities for the two-channel Anderson impurity model are calculated. An exact expression for the self-energy of the impurity Green function as ratio of two correlation functions is given. The imaginary part of the self-energy scales as ??/TK? for T?0 , serving as a hallmark for non-Fermi behavior. The many-body resonance is pinned to a universal value of 1/(2??) at ?=0 for arbitrary local occupation in contrary to the single-channel Anderson impurity model. Its shape becomes increasingly more symmetric for the Kondo regimes of the model. The dynamical spin and channel susceptibilities are governed by two energy scales TK and Th , and their ??(?) approach a constant value for ??0 .

Anders, Frithjof B.

2005-03-01

294

Temperature and pressure dependence of the Anderson-Grüneisen parameter delta for NaCl crystal  

Microsoft Academic Search

A relation for the temperature dependence of the Anderson-Grüneisen parameter delta has been developed from thermodynamical considerations. It has been shown that Chang's relation (delta=2gamma) is a particular case of this expression. delta has been calculated for rock-salt crystal at different temperatures and pressures and the results have been compared with values of delta computed from the basic equation for

M. N. Sharma; S. Gupta

1975-01-01

295

Transient dynamics and steady state behavior of the Anderson–Holstein model with a superconducting lead  

NASA Astrophysics Data System (ADS)

We analyze the nonequilibrium dynamics and steady-state behavior of the two-terminal Anderson–Holstein model with a superconducting and a normal conducting lead. In the deep Kondo limit we develop an analytical description if no phonons are included and a rate equation approach when phonons are present. Both cases are compared with the numerically exact diagrammatic Monte Carlo method obtaining a good agreement. For small voltages we find a pronounced enhancement of phonon sidebands due to the SC DOS.

Albrecht, K. F.; Soller, H.; Mühlbacher, L.; Komnik, A.

2013-12-01

296

Greek M.D. Anderson Symptom Inventory: Validation and Utility in Cancer Patients  

Microsoft Academic Search

Objective: The M.D. Anderson Symptom Inventory (MDASI) is a brief assessment of the severity and impact of cancer-related symptoms. The purpose of this study was the translation and validation of the questionnaire in Greek (G-MDASI). Methods: The translation and validation of the assessment took place at a Pain Relief and Palliative Care Unit. The final validation sample included 150 cancer

Kyriaki Mystakidou; Charles Cleeland; Eleni Tsilika; Emmanuela Katsouda; Aphrodite Primikiri; Efi Parpa; Lambros Vlahos; Tito Mendoza

2004-01-01

297

K-Sample Anderson-Darling Tests of Fit, for Continuous and Discrete Cases  

Microsoft Academic Search

Two k-sample versions of the Anderson-Darling (AD) test of fit are proposed and their asymptotic null distributions are derived for the continuous as well as the discrete case. In the continuous case the asymptotic distributions coincide with the (k 1)-fold convolution of the 1-sample AD asymptotic distribution. Monte Carlo simulation is used to investigate the null distribution small sample behavior

F. W. Scholz; M. A. Stephens

298

A diagrammatic solution of the single-impurity Anderson model in the Kondo regime  

NASA Astrophysics Data System (ADS)

We study the single-impurity Anderson model with diagrammatic techniques. We employ the parquet approach to determine the electron-hole and electron-electron irreducible vertices self-consistently. We demonstrate that when the dominant contributions from the critical region of the singularity driven by multiple electron-hole scatterings are properly taken into account we make the parquet equations soluble and recover the Kondo asymptotics in the symmetric as well as in the asymmetric cases.

Janiš, V.; Augustinský, P.

2007-06-01

299

Adaptive and self-averaging Thouless-Anderson-Palmer mean-field theory for probabilistic modeling  

Microsoft Academic Search

We develop a generalization of the Thouless-Anderson-Palmer (TAP) mean-field approach of disorder physics, which makes the method applicable to the computation of approximate averages in probabilistic models for real data. In contrast to the conventional TAP approach, where the knowledge of the distribution of couplings between the random variables is required, our method adapts to the concrete set of couplings.

Manfred Opper; Ole Winther

2001-01-01

300

Modified James–Anderson method for stress intensity factors of three-dimensional cracked bodies  

Microsoft Academic Search

James and Anderson have proposed a method for the determination of stress intensity factors for three dimensional cracked bodies from experimentally-measured two-dimensional fatigue crack growth data. In the present work, the method is improved through the use of 3D fatigue crack closure theory, and it is shown that the modified method can accurately evaluate stress intensity factors for 3D cracks.

Haijun Shen; Wanlin Guo

2005-01-01

301

Extracellular matrix turnover and disease severity in Anderson–Fabry disease  

Microsoft Academic Search

Summary  \\u000a Background: Anderson–Fabry Disease (AFD) is an inherited metabolic disease associated with premature death secondary to cardiovascular\\u000a and renal disease. Patients with AFD develop progressive left ventricular (LV) remodelling and heart failure. We hypothesized\\u000a that altered extracellular matrix (ECM) turnover contributes to the pathophysiology of cardiac disease in AFD. Methods and Results: Twenty-nine consecutive patients (44.1 ± 11.7 years, 15

J. S. Shah; D. A. Hughes; M. H. Tayebjee; R. J. MacFadyen; A. B. Mehta; P. M. Elliott

2007-01-01

302

Spin-lattice relaxation rate of a magnetic impurity in the spin degenerate Anderson model  

Microsoft Academic Search

The renormalization group formalism was applied to calculate the spin-lattice\\u000arelaxation rate of a well-defined magnetic moment in the neighborhood of a spin\\u000adegenerate Anderson impurity. In the Kondo regime, the spin-lattice relaxation\\u000arate as a function of the temperature presents a peak at the Kondo temperature;\\u000afor temperature much lower then the Kondo temperature, the system behaves as a

J. W. M. Pinto; H. O. Frota

2004-01-01

303

Esr of a Magnetic Probe in the Neighborhood of AN Anderson Impurity  

Microsoft Academic Search

The renormalization group formalism was applied to calculate the spin lattice relaxation rate T1-1 of a magnetic probe located in the neighborhood of a spin degenerate Anderson impurity. In the Kondo regime, T1-1 as a function of the temperature T presents a peak at the Kondo temperature TK. For T≪TK, the system behaves as a heavy Fermi liquid, with an

J. W. M. Pinto; H. O. Frota

2010-01-01

304

Spin-lattice relaxation rate of a magnetic impurity in the spin degenerate Anderson model  

Microsoft Academic Search

The renormalization group formalism was applied to calculate the spin-lattice relaxation rate of a well-defined magnetic moment in the neighborhood of a spin degenerate Anderson impurity. In the Kondo regime, the spin-lattice relaxation rate as a function of the temperature presents a peak at the Kondo temperature; for temperature much lower then the Kondo temperature, the system behaves as a

J. W. M. Pinto; H. O. Frota

2004-01-01

305

MD Anderson study shows new approach connecting smokers to quit lines increases smoking cessation treatment enrollment  

Cancer.gov

Self-identified smokers directly connected to a tobacco cessation quit line are 13 times more likely to enroll in a treatment program as compared to smokers who are handed a quit line referral card and encouraged to call on their own, according to a new study led by researchers at the University of Texas MD Anderson Cancer Center and published online in JAMA Internal Medicine.

306

Performance/Design Requirements and Detailed Technical Description for a Computer-Directed Training Subsystem for Integration into the Air Force Phase II Base Level System.  

ERIC Educational Resources Information Center

|The performance/design requirements and a detailed technical description for a Computer-Directed Training Subsystem to be integrated into the Air Force Phase II Base Level System are described. The subsystem may be used for computer-assisted lesson construction and has presentation capability for on-the-job training for data automation, staff,…

Butler, A. K.; And Others

307

Vitamin K 1 levels and K 1 -dependent coagulation factors II and X in preterm and small-for-date neonates  

Microsoft Academic Search

In 17 preterm neonates and 7 small-for-date neonates, all formula-fed, vitamin K-dependent coagulation factors II and X remained near 45% of adult values from the moment of birth until 28 days postnatally. Vitamin K1 levels, however, showed a remarkable rise from below the detection limit of 0.022 ng\\/ml in umbilical cord blood, to serum levels with a range of 0.99–7.29

A. L. J. M. Pietersma-de Bruyn; P. J. C. van der Straaten; P. M. M. van Haard; J. C. Kuijpers; K. Hamulyák; J. H. Ruys

1990-01-01

308

Urinary levels of type II collagen C-telopeptide crosslink are unrelated to joint space narrowing in patients with knee osteoarthritis  

PubMed Central

Objective To determine whether urinary concentrations of the cross linked C?telopeptide of type II collagen (CTx?II) distinguish subjects with progressive radiographic or symptomatic knee osteoarthritis from those with stable disease. Methods Subjects were 120 obese women with unilateral knee osteoarthritis who participated in a 30 month, randomised, placebo controlled trial of structure modification by doxycycline, in which a standardised semiflexed anteroposterior view of the knee was obtained at baseline and 30?months. Subjects were selected from a larger sample to permit comparisons of urinary CTx?II levels between 60 progressors and 60 non?progressors with respect to medial joint space narrowing. Each group contained 30 subjects who, across five semi?annual assessments, reported on at least two occasions an increase of ?20% in 50 ft walk pain (minimum?=?1?cm on a 10 cm visual analogue scale), relative to the previous visit. The remainder reported no increases in knee pain. Urine samples were obtained semi?annually for determination of the CTx?II and creatinine concentrations. Results In an analysis of the placebo group only, the frequency of radiographic progressors in the upper and middle tertiles (48% and 60%, respectively) of the baseline CTx?II distribution was not significantly different than that in the lower tertile (64%). These results were unchanged after inclusion of data from subjects in the doxycycline group. Furthermore, serial CTx?II levels did not distinguish subjects with progressive radiographic or symptomatic knee osteoarthritis from those with stable disease. Conclusions In this pilot study, urinary CTx?II concentration was not a useful biomarker of osteoarthritis progression.

Mazzuca, S A; Brandt, K D; Eyre, D R; Katz, B P; Askew, J; Lane, K A

2006-01-01

309

Genomic organization and reproductive regulation of a large lipid transfer protein in the varroa mite, Varroa destructor (Anderson & Trueman).  

PubMed

The complete genomic region and corresponding transcript of the most abundant protein in phoretic varroa mites, Varroa destructor (Anderson & Trueman), were sequenced and have homology with acarine hemelipoglycoproteins and the large lipid transfer protein (LLTP) super family. The genomic sequence of VdLLTP included 14 introns and the mature transcript coded for a predicted polypeptide of 1575 amino acid residues. VdLLTP shared a minimum of 25% sequence identity with acarine LLTPs. Phylogenetic assessment showed VdLLTP was most closely related to Metaseiulus occidentalis vitellogenin and LLTP proteins of ticks; however, no heme binding by VdLLTP was detected. Analysis of lipids associated with VdLLTP showed that it was a carrier for free and esterified C12 -C22 fatty acids from triglycerides, diacylglycerides and monoacylglycerides. Additionally, cholesterol and ?-sitosterol were found as cholesterol esters linked to common fatty acids. Transcript levels of VdLLTP were 42 and 310 times higher in phoretic female mites when compared with males and quiescent deutonymphs, respectively. Coincident with initiation of the reproductive phase, VdLLTP transcript levels declined to a third of those in phoretic female mites. VdLLTP functions as an important lipid transporter and should provide a significant RNA interference target for assessing the control of varroa mites. PMID:23834736

Cabrera, A R; Shirk, P D; Duehl, A J; Donohue, K V; Grozinger, C M; Evans, J D; Teal, P E A

2013-07-03

310

Symptomatic hypoglycemia related to inappropriately high igf-ii serum levels in a patient with desmoplastic small round cell tumor.  

PubMed

A 45-year old man was diagnosed with desmoplastic small round cell tumor (DSRCT) with involvement of the peritoneum and pelvis. Disease progression was observed despite systemic chemotherapy. Six months after diagnosis, he developed severe hypoglycemia presented with seizures. He received intravenous glucose infusion and hydrocortisone with poor glycemic control, but with seizures resolution. The investigation excluded insulinoma, adrenal, liver and GH deficiencies. Laboratory showed slight rise of IGF-II and significant increase of the ratio IGF-II : IGF-I, which is pathognomonic of non-islet cell tumor hypoglycemia (NICTH). He received the diagnoses of NICTH related to IGF-II inappropriate production by DSRCT. Despite the attempt to control tumor mass and hypoglycemia, the patient died 9 months after diagnosis. NICTH related to inappropriate IGF-II secretion should be investigated in all cancer patients with refractory hypoglycemia whom insulinoma and other metabolic abnormalities were excluded from. PMID:20592985

Barra, Williams Fernandes; Castro, Gilberto; Hoff, Ana Oliveira; Siqueira, Sheila A C; Hoff, Paulo M

2010-06-02

311

Symptomatic Hypoglycemia Related to Inappropriately High IGF-II Serum Levels in a Patient with Desmoplastic Small Round Cell Tumor  

PubMed Central

A 45-year old man was diagnosed with desmoplastic small round cell tumor (DSRCT) with involvement of the peritoneum and pelvis. Disease progression was observed despite systemic chemotherapy. Six months after diagnosis, he developed severe hypoglycemia presented with seizures. He received intravenous glucose infusion and hydrocortisone with poor glycemic control, but with seizures resolution. The investigation excluded insulinoma, adrenal, liver and GH deficiencies. Laboratory showed slight rise of IGF-II and significant increase of the ratio IGF-II : IGF-I, which is pathognomonic of non-islet cell tumor hypoglycemia (NICTH). He received the diagnoses of NICTH related to IGF-II inappropriate production by DSRCT. Despite the attempt to control tumor mass and hypoglycemia, the patient died 9 months after diagnosis. NICTH related to inappropriate IGF-II secretion should be investigated in all cancer patients with refractory hypoglycemia whom insulinoma and other metabolic abnormalities were excluded from.

Barra, Williams Fernandes; Castro, Gilberto; Hoff, Ana Oliveira; Siqueira, Sheila A. C.; Hoff, Paulo M.

2010-01-01

312

Study of radioactivity levels in granite of Gable Gattar II in the north eastern desert of Egypt  

Microsoft Academic Search

The present work deals with the radioactivity of granites in Gable Gattar II, which is located in the north eastern desert of Egypt. Fifty samples from the area of Gable Gattar II were investigated. The radionuclides of the samples, in Bq\\/kg, have been measured using a hyper-pure germanium spectrometer. The dose obtained for 238U and 232Th ranged from 165±5 to

A. El-Shershaby

2002-01-01

313

Illustration of the SFG-Tracing MultiLevel Behavioral Verification Methodology, by the Correctness Proof of a High to Low Level Synthesis Application in CATHEDRAL-II  

Microsoft Academic Search

The SFG-tracing methodology addresses the automatic verification of digital synchronous circuit implementations as specified at the algorithmic level as signal- (SFG) or data flow graphs. The SFG-tracing methodology is a multi-level design verification paradigm that aims at bridging the gap between higher level specifications down to lower level implementations up to the transistor switch level. The concepts of the SFG-tracing

Mark Genoe; Luc J. M. Claesen; Eric Verlind; Frank Proesmans; Hugo De Mani

1991-01-01

314

Increased mannose 6-phosphate/insulin-like growth factor II receptor and transforming growth factor beta 1 levels during monoterpene-induced regression of mammary tumors.  

PubMed

The monoterpenes represent a potentially new class of breast cancer therapeutic agents. We have shown that d-limonene induces the regression of advanced rat mammary adenocarcinomas. These regressing tumors have an increased cellular concentration of both the mannose-6-phosphate/insulin-like growth factor II receptors and transforming growth factor beta 1. The terpene-induced regression of mammary tumors may result in part from the mitoinhibitory and differentiation properties of active transforming growth factor beta 1. Furthermore, the activation of transforming growth factor beta 1 in these tumors is likely to be facilitated by the increased concentration of the mannose-6-phosphate/insulin-like growth factor II receptors in the mammary tumor cells. Tumors not responding to terpene therapy lacked a rise in the mannose-6-phosphate/insulin-like growth factor II receptor level which may relate to the fact that this gene is hemizygous due to maternal imprinting. PMID:8358708

Jirtle, R L; Haag, J D; Ariazi, E A; Gould, M N

1993-09-01

315

Low-energy exciton level structure and dynamics in light harvesting complex II trimers from the Chl a/b antenna complex of photosystem II  

SciTech Connect

Nonphotochemical hole-burned spectra obtained as a function of burn wavelength at 4.2 K are reported for the isolated LHC II peripheral antenna complex of photosystem II. The lowest-energy state of the trimer complex is shown to lie at 680 nm, 4 nm below the most intense Chl a band at 676 nm. The linear electron-phonon coupling for the 680-nm state is characterized and used to predict that its fluorescence origin should lie at 681 nm, precisely coincident with the observed origin at 4.2 K. The 680-nm band carries the equivalent absorption strength of about one chlorophyll a molecule per C[sub 3] trimer complex, which contains about 27 chlorophyll a molecules. The 680-nm absorption band possesses an inhomogeneous width of [approximately] 120 cm[sup [minus]1], and its zero-phonon line distribution function is largely uncorrelated with those of the higher-energy states. Zero-phonon hole widths are used to determine that the fluorescent 680-nm state dephases in 10 ps at 4.2 K. An interpretation of this dephasing is given in terms of the trimer of subunits structure. Based on the satellite hole structure observed upon hole burning into the 680-nm state, two new states at 674 and 678 nm are identified. 56 refs., 5 figs.

Reddy, N.R.S.; Small, G.J. (Ames Lab., IA (United States) Iowa State Univ., Ames, IA (United States)); Amerongen, H. van; Kwa, S.L.S.; Grondelle, R. van (Free Univ., Amsterdam (Netherlands))

1994-04-28

316

The nucleus 198Au investigated with neutron capture and transfer reactions. II. construction of the level scheme and calculation of level densities.  

NASA Astrophysics Data System (ADS)

The level scheme of 198Au was constructed. Up to 1560 keV a total of 111 (d,p) and 125 (n,g) levels was included, frequently with spin and parity assignments. The results for level densities are calculated in interacting boson-fermion-fermion model (IBFFM) and Gaussian polynomial method (GPM) and are compared to the present data.

Mayerhofer, Ulrich; von Egidy, Till; Klora, Jörg; Lindner, Helmut; Börner, Hans G.; Judge, Stephen; Krusche, Bernd; Robinson, Stephen; Schreckenbach, Klaus; Sukhovoj, Anatoly M.; Khitrov, Valery A.; Boneva, Stefka T.; Paar, Vladimir; Brant, Slobodan; Pezer, Robert

317

The eVects of freshwater to seawater transfer on circulating levels of angiotensin II, C-type natriuretic peptide and arginine vasotocin in the euryhaline elasmobranch, Carcharhinus leucas  

Microsoft Academic Search

This study examined the eVect of transfer to increased environmental salinity on the circulating levels of angiotensin II (ANG II), C-type natriuretic peptide (CNP), and arginine vasotocin (AVT) in the euryhaline elasmobranch, Carcharhinus leucas. Plasma levels of ANG II and CNP were signiWcantly increased in C. leucas chronically acclimated to seawater (SW) in comparison to freshwater (FW) acclimated Wsh. There

W. Gary Anderson; Richard D. Pillans; Susumu Hyodo; Takehiro Tsukada; Jonathan P. Good; Yoshio Takei; Craig E. Franklin; Neil Hazon

2006-01-01

318

Mercaptoacetamide-based class II HDAC inhibitor lowers A? levels and improves learning and memory in a mouse model of Alzheimer's disease.  

PubMed

Histone deacetylase inhibitors (HDACIs) alter gene expression epigenetically by interfering with the normal functions of HDAC. Given their ability to decrease A? levels, HDACIs are a potential treatment for Alzheimer's disease (AD). However, it is unclear how HDACIs alter A? levels. We developed two novel HDAC inhibitors with improved pharmacological properties, such as a longer half-life and greater penetration of the blood-brain barrier: mercaptoacetamide-based class II HDACI (coded as W2) and hydroxamide-based class I and IIHDACI (coded as I2) and investigated how they affect A? levels and cognition. HDACI W2 decreased A?40 and A?42 in vitro. HDACI I2 also decreased A?40, but not A?42. We systematically examined the molecular mechanisms by which HDACIs W2 and I2 can decrease A? levels. HDACI W2 decreased gene expression of ?-secretase components and increased the A? degradation enzyme Mmp2. Similarly, HDACI I2 decreased expression of ?- and ?-secretase components and increased mRNA levels of A? degradation enzymes. HDACI W2 also significantly decreased A? levels and rescued learning and memory deficits in aged hAPP 3xTg AD mice. Furthermore, we found that the novel HDACI W2 decreased tau phosphorylation at Thr181, an effect previously unknown for HDACIs. Collectively, these data suggest that class II HDACls may serve as a novel therapeutic strategy for AD. PMID:23063601

Sung, You Me; Lee, Taehee; Yoon, Hyejin; DiBattista, Amanda Marie; Song, Jung Min; Sohn, Yoojin; Moffat, Emily Isabella; Turner, R Scott; Jung, Mira; Kim, Jungsu; Hoe, Hyang-Sook

2012-10-11

319

Hydrothermal assembly and luminescence property of lanthanide-containing Anderson polyoxometalates  

SciTech Connect

Two compounds, {l_brace}[Sm(H{sub 2}O){sub 5}]{sub 2}(TeMo{sub 6}O{sub 24}){r_brace}.6H{sub 2}O (1) and {l_brace}[Eu(H{sub 2}O){sub 7}]{sub 2} (TeMo{sub 6}O{sub 24}){r_brace}.5H{sub 2}O (2) have been synthesized by hydrothermal reactions and characterized by elemental analyses, IR spectra, thermal stability analyses, X-ray powder diffraction, and single-crystal X-ray diffraction. Compound 1 represents the first example of a 2D layer architecture constructed from Anderson-type polyoxoanions [TeMo{sub 6}O{sub 24}]{sup 6-} and rare-earth ions Ln{sup 3+}. Compound 2 displays a 1D chain structure built up of alternating Anderson-type polyoxoanions [TeMo{sub 6}O{sub 24}]{sup 6-} and rare-earth ions Eu{sup 3+} along the c-axis. Luminescence measurement of 2 exhibits typical red fluorescent emission of the Eu{sup 3+} ion at room temperature. Furthermore, the emission is intense enough to be observed macroscopically under UV irradiation (365 nm). - Graphical abstract: Two compounds based on Anderson-type polyoxoanion building blocks and rare-earth ions have been synthesized under hydrothermal conditions. Compound 1 exhibits a 2D layer architecture constructed from [TeMo{sub 6}O{sub 24}]{sup 6-} anions and rare-earth ions Ln{sup 3+}. Compound 2 displays a 1D chain structure and possesses the intense luminescence property.

Liu Ying [Key Laboratory of Polyoxometalates Science of Ministry of Education, College of Chemistry, Northeast Normal University, Changchun City, JiLin 130024 (China); Liu Shuxia [Key Laboratory of Polyoxometalates Science of Ministry of Education, College of Chemistry, Northeast Normal University, Changchun City, JiLin 130024 (China)], E-mail: liusx@nenu.edu.cn; Cao Ruige; Ji Hongmei; Zhang Shiwei; Ren Yuanhang [Key Laboratory of Polyoxometalates Science of Ministry of Education, College of Chemistry, Northeast Normal University, Changchun City, JiLin 130024 (China)

2008-09-15

320

Dose to level I and II axillary lymph nodes and lung by tangential field radiation in patients undergoing postmastectomy radiation with tissue expander reconstruction  

PubMed Central

Background To define the dosimetric coverage of level I/II axillary volumes and the lung volume irradiated in postmastectomy radiotherapy (PMRT) following tissue expander placement. Methods and Materials Twenty-three patients were identified who had undergone postmastectomy radiotherapy with tangent only fields. All patients had pre-radiation tissue expander placement and expansion. Thirteen patients had bilateral expander reconstruction. The level I/II axillary volumes were contoured using the RTOG contouring atlas. The patient-specific variables of expander volume, superior-to-inferior location of expander, distance between expanders, expander angle and axillary volume were analyzed to determine their relationship to the axillary volume and lung volume dose. Results The mean coverage of the level I/II axillary volume by the 95% isodose line (VD95%) was 23.9% (range 0.3 - 65.4%). The mean Ipsilateral Lung VD50% was 8.8% (2.2-20.9). Ipsilateral and contralateral expander volume correlated to Axillary VD95% in patients with bilateral reconstruction (p = 0.01 and 0.006, respectively) but not those with ipsilateral only reconstruction (p = 0.60). Ipsilateral Lung VD50% correlated with angle of the expander from midline (p = 0.05). Conclusions In patients undergoing PMRT with tissue expanders, incidental doses delivered by tangents to the axilla, as defined by the RTOG contouring atlas, do not provide adequate coverage. The posterior-superior region of level I and II is the region most commonly underdosed. Axillary volume coverage increased with increasing expander volumes in patients with bilateral reconstruction. Lung dose increased with increasing expander angle from midline. This information should be considered both when placing expanders and when designing PMRT tangent only treatment plans by contouring and targeting the axilla volume when axillary treatment is indicated.

2011-01-01

321

MESODIF-II: a variable trajectory plume segment model to assess ground-level air concentrations and deposition of effluent releases from nuclear power facilities  

Microsoft Academic Search

MESODIF-II is a variable trajectory plume segment atmospheric transport model designed to predict normalized air concentrations and deposition of radioactive, but otherwise non-reactive, effluents released from one or two levels over the same position in an xy-plane. In such a model, calculated particle trajectories vary as synoptic scale wind varies. At all sampling times the particles are connected to form

D. C. Powell; H. L. Wegley; T. D. Fox

1978-01-01

322

Systematic Source Term Analyses for Level 3 PSA of a BWR With Mark-II Type Containment With THALES2 Code  

Microsoft Academic Search

The THALES-2 code is an integrated severe accident analysis code developed at the Japan Atomic Energy Research Institute in order to simulate the accident progression and transport of radioactive material for probabilistic safety assessment (PSA) of a nuclear power plant. As part of a level 3 PSA being performed at JAERI for a 1,100 MWe BWR-5 with a Mark-II containment,

Jun Ishikawa; Ken Muramatsu; Toru Sakamoto

2002-01-01

323

Results and insights from the N Reactor Level II\\/III PRA (probabilistic risk assessment) for application to advanced reactor designs  

Microsoft Academic Search

A Level II\\/III probabilistic risk assessment has been performed for N Reactor, a US Department of Energy production reactor. State-of-the-art methodology was employed based on methods developed by Sandia for the US Nuclear Regulatory Commission for the NUREG-1150 study. Latin Hypercube sampling techniques were used to develop uncertainty distributions for the risks associated with postulated core damage events initiated by

G. D. Wyss; D. M. Kunsman; A. L. Camp

1990-01-01

324

Anderson localization of a Bose-Einstein condensate in a 3D random potential.  

PubMed

We study the effect of Anderson localization on the expansion of a Bose-Einstein condensate, released from a harmonic trap, in a 3D random potential. We use scaling arguments and the self-consistent theory of localization to show that the long-time behavior of the condensate density is controlled by a single parameter equal to the ratio of the mobility edge and the chemical potential of the condensate. We find that the two critical exponents of the localization transition determine the evolution of the condensate density in time and space. PMID:18518212

Skipetrov, S E; Minguzzi, A; van Tiggelen, B A; Shapiro, B

2008-04-24

325

Magnetic field induced quantum phase transitions in the two-impurity Anderson model  

SciTech Connect

In the two-impurity Anderson model, the inter-impurity spin exchange interaction favors a spin singlet state between two impurities leading to the localization of quasiparticles. We show that a local uniform magnetic field can delocalize the quasiparticies to restore the Kondo resonance. This transition is found to be continuous, accompanied by not only the divergence of the staggered (anti ferromagnetic) susceptibility, but also the divergence of the uniform spin susceptibility. This implies that the magnetic field induced quantum phase transitions in Kondo systems are in favor of the local critical type.

Zhu, Lujun [Los Alamos National Laboratory; Zhu, Jian - Xin [Los Alamos National Laboratory

2010-11-17

326

SU(3) Anderson impurity model: A numerical renormalization group approach exploiting non-Abelian symmetries  

NASA Astrophysics Data System (ADS)

We show how the density-matrix numerical renormalization group method can be used in combination with non-Abelian symmetries such as SU(N). The decomposition of the direct product of two irreducible representations requires the use of a so-called outer multiplicity label. We apply this scheme to the SU(3) symmetrical Anderson model, for which we analyze the finite size spectrum, determine local fermionic, spin, superconducting, and trion spectral functions, and also compute the temperature dependence of the conductance. Our calculations reveal a rich Fermi liquid structure.

Moca, C?t?lin Pa?cu; Alex, Arne; von Delft, Jan; Zaránd, Gergely

2012-11-01

327

Critical State of the Anderson Transition: Between a Metal and an Insulator  

NASA Astrophysics Data System (ADS)

Using a three-frequency one-dimensional kicked rotor experimentally realized with a cold atomic gas, we study the transport properties at the critical point of the metal-insulator Anderson transition. We accurately measure the time evolution of an initially localized wave packet and show that it displays at the critical point a scaling invariance characteristic of this second-order phase transition. The shape of the momentum distribution at the critical point is found to be in excellent agreement with the analytical form deduced from the self-consistent theory of localization.

Lemarié, Gabriel; Lignier, Hans; Delande, Dominique; Szriftgiser, Pascal; Garreau, Jean Claude

2010-08-01

328

Critical State of the Anderson Transition: Between a Metal and an Insulator  

SciTech Connect

Using a three-frequency one-dimensional kicked rotor experimentally realized with a cold atomic gas, we study the transport properties at the critical point of the metal-insulator Anderson transition. We accurately measure the time evolution of an initially localized wave packet and show that it displays at the critical point a scaling invariance characteristic of this second-order phase transition. The shape of the momentum distribution at the critical point is found to be in excellent agreement with the analytical form deduced from the self-consistent theory of localization.

Lemarie, Gabriel; Delande, Dominique [Laboratoire Kastler Brossel, UPMC-Paris 6, ENS, CNRS, 4 Place Jussieu, F-75005 Paris (France); Lignier, Hans; Szriftgiser, Pascal; Garreau, Jean Claude [Laboratoire de Physique des Lasers, Atomes et Molecules, Universite Lille 1 Sciences et Technologies, UMR CNRS 8523, F-59655 Villeneuve d'Ascq Cedex (France)

2010-08-27

329

Magnetic properties of the symmetric periodic Anderson model in infinite dimensions  

NASA Astrophysics Data System (ADS)

Within a special kind of slave-boson mean-field approximation, which allows for the symmetry-broken states appropriate for a bipartite lattice, it is found that there is a phase transition to the antiferromagnetic insulator for the symmetric periodic Anderson model, and the critical value of the hybridization matrix element is consistent with the quantum Monte Carlo result of Jarrell, Akhlaghpour, and Pruschke [Phys. Rev. Lett. 70, 1670 (1993)]. Our results suggest that the magnetism is itinerant near the critical value of the hybridization matrix element, and it smoothly crosses over to the local-moment regime as the hybridization decreases to zero.

Sun, Shih-Jye; Yang, Min-Fong; Hong, Tzay-Ming

1993-12-01

330

Tailoring Anderson localization by disorder correlations in 1D speckle potentials  

NASA Astrophysics Data System (ADS)

We study Anderson localization of single particles in continuous, correlated, one-dimensional disordered potentials. We show that tailored correlations can completely change the energy-dependence of the localization length. By considering two suitable models of disorder, we explicitly show that disorder correlations can lead to a nonmonotonic behavior of the localization length versus energy. Numerical calculations performed within the transfer-matrix approach and analytical calculations performed within the phase formalism up to order three show excellent agreement and demonstrate the effect. We finally show how the nonmonotonic behavior of the localization length with energy can be observed using expanding ultracold-atom gases.

Piraud, Marie; Sanchez-Palencia, Laurent

2013-02-01

331

Anderson localization of 3d Mn states in semi-Heusler phases  

NASA Astrophysics Data System (ADS)

The solid solutions NiTi1-xMnxSb and CoV1-xMnxSb between metallic compounds are studied. For low Mn concentrations, Mn 3d states are localized as shown by magnetic measurements and electronic structure calculations. Magnetic interactions suddenly and strongly increase near x=0.4, while a semiconductinglike behavior is observed in the range x=0.35-0.45. These features are tentatively explained by the Anderson localization of d states in these disordered solutions. Large magnetoresistance effects are observed in some phases near their magnetic ordering temperature.

Kaczmarska, K.; Pierre, J.; Tobola, J.; Skolozdra, R. V.

1999-07-01

332

Unified description of perturbation theory and band center anomaly in one-dimensional Anderson localization  

NASA Astrophysics Data System (ADS)

We calculated numerically the localization length of one-dimensional Anderson model with diagonal disorder. For weak disorder, we showed that the localization length changes continuously as the energy changes from the band center to the boundary of the anomalous region near the band edge. We found that all the localization lengths for different disorder strengths and different energies collapse onto a single curve, which can be fitted by a simple equation. Thus the description of the perturbation theory and the band center anomaly were unified into this equation.

Kang, Kai; Qin, Shaojing; Wang, Chuilin

2011-09-01

333

PRESTO-II Computer Code for Safety Assessment on Shallow Land Disposal of Low-Level Wastes.  

National Technical Information Service (NTIS)

The PRESTO-II (Prediction of Radiation Effects from Shallow Trench Operations) computer code has been applied for the following sites; Koteyli, Balikesir and Kozakli, Nevsehir in Turkey. This site selection was based partially on the need to consider a va...

I. Uslu D. E. Fields M. G. Yalcintas

1987-01-01

334

Impact of Angiotensin II Receptor Blocker on Plasma Levels of Adiponectin and Advanced Oxidation Protein Products in Peritoneal Dialysis Patients  

Microsoft Academic Search

Background: Oxidative stress and adipocytokines are reported to contribute to the pathogenesis of atherosclerosis. Though the inhibition of the renin-angiotensin system is known to have beneficial effects on atherosclerosis, the exact mechanisms for this remain to be clarified. The aim of this study was to determine the effects of angiotensin II receptor blockers (ARB) on the oxidative stress and adipocytokines

Ryuichi Furuya; Mari Odamaki; Hiromichi Kumagai; Akira Hishida

2006-01-01

335

Training Level, Acculturation, Role Ambiguity, and Multicultural Discussions in Training and Supervising International Counseling Students in the United States  

ERIC Educational Resources Information Center

|This research partially replicated Nilsson and Anderson's "Professional Psychology: Research and Practice" (2004) study on training and supervising international students. It investigated the relationships among international counseling students' training level, acculturation, supervisory working alliance (SWA), counseling self-efficacy (COSE),…

Ng, Kok-Mun; Smith, Shannon D.

2012-01-01

336

Training Level, Acculturation, Role Ambiguity, and Multicultural Discussions in Training and Supervising International Counseling Students in the United States  

ERIC Educational Resources Information Center

This research partially replicated Nilsson and Anderson's "Professional Psychology: Research and Practice" (2004) study on training and supervising international students. It investigated the relationships among international counseling students' training level, acculturation, supervisory working alliance (SWA), counseling self-efficacy (COSE),…

Ng, Kok-Mun; Smith, Shannon D.

2012-01-01

337

Invariants of the single-impurity Anderson model and implications for conductance functionals  

NASA Astrophysics Data System (ADS)

An exact relation between the conductance maximum G0 at zero temperature and a ratio of lead densities is derived within the framework of the single-impurity Anderson model: G_0={\\mathfrak R}[n] \\frac{2e^2}{h} , where {\\mathfrak R}[n]=4\\Delta N_{{\\cal L},x} \\Delta N_{{\\cal R},x}/(\\Delta N_{{\\cal L},x}+\\Delta N_{{\\cal R},x})^2 and \\Delta N_{{\\cal L},x} , \\Delta N_{{\\cal R},x} denote the excess density in the left/right lead at distance x due to the presence of the impurity at the origin, x = 0. The relation constitutes a parameter-free expression of the conductance of the model in terms of the ground-state density that generalizes an earlier result to the generic case of asymmetric lead couplings. It turns out that the specific density ratio, {\\mathfrak R}[n] , is independent of the distance to the impurity x, the (magnetic) band structure and filling fraction of the contacting wires, the strength of the onsite interaction, the gate voltage and the temperature. Disorder-induced backscattering in the contacting wires has an impact on {\\mathfrak R} that we discuss. Our result suggests that it should be possible, in principle, to determine experimentally the peak conductance of the Anderson impurity by performing a combination of measurements of ground-state densities.

Evers, F.; Schmitteckert, P.

2013-08-01

338

Observations of nighttime winds using pilot balloons in Anderson Creek Valley, Geysers, California  

SciTech Connect

Nighttime drainage or downslope winds along the east-facing slope of Anderson Creek Valley located in the Geysers area of northern California are examined using pilot balloons as air parcel tracers. Observations made over four nights show a persistent pattern of winds. Before sunset strong westerly winds blow into the valley. These winds are believed due to the late afternoon sea breeze. Drainage winds become fully developed within 2 h after sunset. The drainage wind has an average speed of approx.3 m s/sup -1/ regardless of the speed of the ambient wind. The drainage layer thickness grows at a rate of approx.80 m per kilometer of downwind distance. Balloons in the drainage current quickly spread throughout the shallow, sidewall canyon containing Anderson Creek. The transition from the local valley wind system to the free, ambient wind occurs at about ridge height, i.e., /sub 5/00 m above the valley basin, for weak ambient winds, and at /sub 3/00 m above the valley basin for strong ambient winds.

Nappo, C.J.; Snodgrass, H.F.

1981-06-01

339

Finding Order in Chaos: Complexity in the Career of Don L Anderson  

NASA Astrophysics Data System (ADS)

Don Anderson's career has been marked by a long standing interest in plate tectonics and the earth's interior. But from time to time, he has departed from these major themes to investigate related topics. For example, during the 1970's, he proposed several seminal ideas, such as the applicability of cracks and fracture theory to earthquakes, and the idea of accelerated plate tectonics. Although on the surface, these topics might seem quite disparate from mantle convection, seismic structure of the earth's interior, and thermodynamics of mineral phases, they nonetheless are now known to share common theoretical underpinnings. In particular, the concepts of nonlinear dynamical systems, complexity, chaos, and energy and fitness landscapes can be used to describe the evolution of all complex nonlinear systems. The principle of minimum free energy (maximum fitness) is frequently used to obtain Langevin-type equations for such systems, and ideas of statistical field theory are employed to obtain scaling exponents and other features. In this talk, we describe these ideas and relate them to the types of problems in which Don Anderson has been primarily interested.

Rundle, P.; Rundle, J.; Klein, W.

2003-12-01

340

Beneficial effect of combination therapy comprising angiotensin II receptor blocker plus calcium channel blocker on plasma adiponectin levels.  

PubMed

The study aim was to examine the effect of combination therapy comprising angiotensin receptor blocker plus calcium antagonist on post-treatment plasma adiponectin levels compared to pretreatment levels. There was a significant gender difference in the relationship between preadiponectin level and age. In the search for contributing factors for treatment-based changes in adiponectin levels, these effects of gender and age were considered in statistical analysis. The adiponectin level in the combination therapy group was further increased compared to that in each of the monotherapy groups, despite there being no significant difference in antihypertensive effect, indicating that the combined medication provided an effect beyond that of lowering blood pressure. PMID:20144069

Inoue, Yukiko; Kakuma, Tatsuyuki; Nonaka, Yoshisuke; Sumi, Shunichiro; Okamura, Keisuke; Kodama, Sunao; Ando, Chie; Niimura, Hideya; Miyoshi, Kei; Tsuchiya, Yoshihiro; Yamanouchi, Yoshio; Urata, Hidenori

2010-01-01

341

Effects of haloperidol, clozapine and citalopram on messenger RNA levels of chromogranins A and B and secretogranin II in various regions of rat brain.  

PubMed

We have measured the messenger RNA levels of chromogranins A and B and secretogranin II in various brain regions of rats subchronically treated with various antipsychotic drugs. Since, as shown previously, the messenger RNA levels of these peptides are increased when neurons are stimulated, we hoped to identify by this approach those nuclei which are subchronically influenced by these drugs. The drugs chosen were the neuroleptic halperidol, a blocker of dopamine receptors, the atypical antipsychotic clozapine, which in addition to blocking dopamine receptors also blocks those for serotonin, and citalopram, a specific serotonin reuptake inhibitor. In agreement with previous data on neuropeptide messenger RNAs, we found in the dorsolateral striatum an increase of the secretogranin II messenger RNA levels after haloperidol and a much smaller one after clozapine. In the nucleus accumbens and in the bed nucleus of the stria terminalis, both compounds had a comparable positive effect. These differential effects can be attributed to a different action of these drugs on dopamine receptor subtypes. In the zona incerta, clozapine decreased the secretogranin II and chromogranin A message, whereas in the dorsal raphe it led to an increase. On the other hand, citalopram induced exactly the opposite effects in these two brain regions. This phenomenon can be explained by the differential interaction of these drugs with serotonergic mechanisms. Additional, relatively small changes of the mRNAs were seen in several other brain regions. These results establish that changes in the mRNA levels of the chromogranins are good indicators for the effect of drugs on certain brain nuclei. The concomitant action of haloperidol and clozapine on the limbic regions, i.e. the nucleus accumbens and the bed nucleus of the stria terminalis, points to these brain regions for the antipsychotic action of these two neuroleptics. PMID:8596656

Kroesen, S; Marksteiner, J; Mahata, S K; Mahata, M; Fischer-Colbrie, R; Saria, A; Kapeller, I; Winkler, H

1995-12-01

342

Patriot Games: Yes, Indeed, the British Are Coming! But M. T. Anderson's Revolutionary War Novel Is Unlike Anything You've Ever Read  

ERIC Educational Resources Information Center

|This article presents an interview with 38-year-old writer Matthew Tobin Anderson. In the interview, Anderson talks about his experiences, passion for writing, teenage interests, and his relation to the distinguished writer Mark Twain. He also states the importance of liberty and what it takes to be a patriot and a loyalist. Furthermore, Matthew…

Horning, Kathleen

2006-01-01

343

A Level Set Approach to a Unified Model for Etching, Deposition, and Lithography II: Three-Dimensional Simulations  

Microsoft Academic Search

We apply a level set formulation to the problem of surface advancement in three-dimensional topograhy simulation of deposition, etching, and lithography processes in integrated circuit fabrication. The level set formulation is based on solving a Hamilton-Jacobi-type equation for a propagating level set function, using techniques borrowed from hyperbolic conservation laws. Topological changes, corner and cusp development, and accurate determination of

D. Adalsteinsson; J. A. Sethian

1995-01-01

344

Guide for Teaching English as a Second Language to Elementary School Pupils. Level I, Part II. Teaching English Early.  

ERIC Educational Resources Information Center

|The guides have been written to help teachers provide effective instruction for children who do not speak English as their native language. The guides have been planned for use in the primary grades and have been written on two levels of difficulty. The first level contains 128 lessons, the second 115, and each provides instruction for…

Wilson, Robert; And Others

345

Multi-level assessment of chronic toxicity of estuarine sediments with the amphipod Gammarus locusta: II. Organism and population-level endpoints.  

PubMed

This study aimed to test the performance of the amphipod Gammarus locusta (L.) in chronic sediment toxicity tests. It constitutes part of a multi-level assessment of chronic toxicity of estuarine sediments, integrating organism and population-level endpoints with biochemical markers responses. Here we account for organism and population-level effects, while biomarker responses were reported in a companion article. Five moderately contaminated sediments from Sado and Tagus estuaries were tested, comprising 3 muddy and 2 sandy sediments. These sediments either did not show acute toxicity or were diluted with control sediment as much as required to remove acute toxicity. Subsequent chronic tests consisted of 28-day exposures with survival, individual growth and reproductive traits as endpoints. Two of the muddy sediments induced higher growth rates in the amphipods, and improved reproductive traits. This was understood to be a consequence of the amount of organic matter in the sediment, which was nutritionally beneficial to the amphipods, while concurrently decreasing contaminant bioavailability. Biomarker responses did not reveal toxicant-induced stress in amphipods exposed to these sediments. One of the sandy sediments was acutely toxic at 50% dilution, but in contrast stimulated amphipod growth when diluted 75%. This was presumed to be an indication of a hormetic response. Finally the two remaining contaminated sediments showed pronounced chronic toxicity, affecting survival and reproduction. The sex ratio of survivors was highly biased towards females, and offspring production was severely impaired. The particulars of the responses of this amphipod were examined, as well as strengths versus limitations of the sediment test. This study illustrates the utility of this chronic test for toxicity assessment of contaminated estuarine sediments, with potential application all along Atlantic Europe. PMID:15649529

Costa, Filipe O; Neuparth, Teresa; Correia, Ana D; Costa, Maria Helena

2005-07-01

346

Room Temperature ppb Level Chlorine Gas Sensor Based on Copper (II) 1, 4, 8, 11, 15, 18, 22, 25-octabutoxy-29 H, 31 H-phthalocyanine Films  

SciTech Connect

Spin coating technique has been used to fabricate room temperature chlorine gas sensor based on copper (II) 1, 4, 8, 11, 15, 18, 22, 25-octabutoxy-29 H, 31 H-phthalocyanine (CuPc(OBu){sub 8}) films. Gas sensor shows a response of 185% to few parts per billion level of Cl{sub 2} gas with response time of 9.5 minutes at room temperature. The interactions between sensor and analytes followed first order kinetics with rate constant 0.01{<=}k{<=}0.02. The chemiresistive sensor showed very good stability at room temperature over a long period of time.

Bedi, R. K.; Saini, Rajan; Mahajan, Aman [Material Science Laboratory, Department of PhysicsGuru Nanak Dev University, Amritsar-143005 (India)

2010-12-01

347

Room Temperature ppb Level Chlorine Gas Sensor Based on Copper (II) 1, 4, 8, 11, 15, 18, 22, 25-octabutoxy-29 H, 31 H-phthalocyanine Films  

NASA Astrophysics Data System (ADS)

Spin coating technique has been used to fabricate room temperature chlorine gas sensor based on copper (II) 1, 4, 8, 11, 15, 18, 22, 25-octabutoxy-29 H, 31 H-phthalocyanine (CuPc(OBu)8) films. Gas sensor shows a response of 185% to few parts per billion level of Cl2 gas with response time of 9.5 minutes at room temperature. The interactions between sensor and analytes followed first order kinetics with rate constant 0.01<=k<=0.02. The chemiresistive sensor showed very good stability at room temperature over a long period of time.

Bedi, R. K.; Saini, Rajan; Mahajan, Aman

2010-12-01

348

Microscopic derivation of self-consistent equations of Anderson localization in a disordered medium of finite size.  

PubMed

We present a microscopic derivation of self-consistent equations of Anderson localization in a disordered medium of finite size. The derivation leads to a renormalized, position-dependent diffusion coefficient. The position dependence of the latter is due to the position dependence of return probability in a bounded medium. PMID:18517751

Cherroret, N; Skipetrov, S E

2008-04-29

349

Extraoral maxillofacial prosthetic rehabilitation at the M. D. Anderson Cancer Center: A survey of patient attitudes and opinions  

Microsoft Academic Search

Statement of problem. Measures of satisfaction after extraoral maxillofacial prosthetic rehabilitation have been sparsely reported. Purpose. This article reviews the care-related opinions of patients who were provided extraoral prostheses at the M. D. Anderson Cancer Center over the course of 10 years. Material and methods. A questionnaire was delivered to 263 extraoral prosthetic patients to elucidate their degree of satisfaction

Jeffery C. Markt; James C. Lemon

2001-01-01

350

Identification and Analysis of Learning Preferences of Mentally Ill Adults in Rehabilitative Psychosocial Therapy at the Anderson Mental Health Center.  

ERIC Educational Resources Information Center

|A study identified and analyzed the learning preferences of 17 seriously and chronically mentally ill adults participating in the rehabilitative psychosocial therapy program at the Toxaway Church Site of the Anderson Mental Health Center. Staff perceived as boring and unfocused the traditional treatment approach that relied mainly upon…

Newman, Michael K.

351

MD Anderson study finds SUMO-snipping protein plays crucial role in T and B cell development  

Cancer.gov

When SUMO grips STAT5, a protein that activates genes, it blocks the healthy embryonic development of immune B cells and T cells unless its nemesis breaks the hold, a research team led by scientists at The University of Texas MD Anderson Cancer Center reports in Molecular Cell.

352

[Comment on ``Mechanical Properties and Processes in the Mantle'' by Sykes, Kay and Anderson] Disagreement With Terms  

Microsoft Academic Search

Attention is invited to the misuse of the word `rheology' by some of your writers. See, for example, `Mechanical Properties and Processes in the Mantle,' by Sykes, Kay, and Anderson, in the December issue of EOS.The word `rheology,' as defined in Dictionary of Geological Terms, Dolphin, 1962, page 423; and Glossary of Geology and Earth Sciences with Supplement, American Geological

J. H. Tatsch

1971-01-01

353

Dynamics of the Anderson model for dilute magnetic alloys: A quantum Monte Carlo and maximum entropy study  

Microsoft Academic Search

In this article we describe the results of a new method for calculating the dynamical properties of the Anderson model. QMC generates data about the Matsubara Green's functions in imaginary time. To obtain dynamical properties, one must analytically continue these data to real time. This is an extremely ill-posed inverse problem similar to the inversion of a Laplace transform from

R. N. Silver; J. E. Gubernatis; D. S. Sivia; M. Jarrell

1990-01-01

354

Cramer–von Mises and Anderson-Darling goodness of fit tests for extreme value distributions with unknown parameters  

Microsoft Academic Search

The use of goodness of fit tests based on Cramer–von Mises and Anderson-Darling statistics is discussed, with reference to the composite hypothesis that a sample of observations comes from a distribution, FH, whose parameters are unspecified. When this is the case, the critical region of the test has to be redetermined for each hypothetical distribution FH. To avoid this difficulty,

Francesco Laio

2004-01-01

355

Survival and recurrence factors in adult medulloblastoma: The M.D. Anderson Cancer Center experience from 1978 to 1998  

Microsoft Academic Search

Medulloblastoma is a rare adult primary brain tumor for which limited retrospective studies are available to elucidate natural history or to guide therapy. A retro- spective chart and imaging review of adult patients (aged >18 years) with medulloblastoma was performed to identify survival and prognostic factors. Fifty-seven patients were evaluated at the University of Texas M.D. Anderson Cancer Center from

Lara J. Kunschner; John Kuttesch; Kenneth Hess; W. K. Alfred Yung

356

Potential side effects of dental amalgam restorations. (II). No relation between mercury levels in the body and mental disorders.  

PubMed

A group of 50 consecutive patients, referred for self-reported complaints which they related to dental amalgam restorations, was compared with control patients matched by age, sex and postal zip code. All patients were subjected to a psychiatric examination and a set of rating scales and questionnaires, and the symptoms were related to the mercury levels in blood, urine and hair. A psychiatric diagnosis was established in 70% of the patients in the index group versus 14% in the control group. The prevailing symptoms were anxiety, asthenia and depression. Mercury levels in blood, urine and hair were similar among index cases and controls, and were far below critical levels of mercury intoxication. There was no correlation between mercury levels and the severity of the reported symptoms. Therefore, mercury was not a likely cause of the complaints. Instead, the reported symptoms were part of a broad spectrum of mental disorders. PMID:9249191

Bratel, J; Haraldson, T; Ottosson, J O

1997-06-01

357

Failure of single-parameter scaling of wave functions in Anderson localization  

NASA Astrophysics Data System (ADS)

We show how to use properties of the vectors which are iterated in the transfer-matrix approach to Anderson localization, in order to generate the statistical distribution of electronic wave-function amplitudes at arbitrary distances from the origin of Ld-1×? disordered systems. For d=1 our approach is shown to reproduce exact diagonalization results available in the literature. In d=2, where strips of width L<=64 sites were used, attempted fits of Gaussian (log-normal) forms to the wave-function amplitude distributions result in effective localization lengths growing with distance, contrary to the prediction from single-parameter scaling theory. We also show that the distributions possess a negative skewness S, which is invariant under the usual histogram-collapse rescaling, and whose absolute value increases with distance. We find 0.15<~-S<~0.30 for the range of parameters used in our study.

Queiroz, S. L.

2002-11-01

358

Anderson localization of a weakly interacting one-dimensional Bose gas  

NASA Astrophysics Data System (ADS)

We consider the phase coherent transport of a quasi-one-dimensional beam of Bose-Einstein condensed particles through a disordered potential of length L . Among the possible different types of flow we identified [T. Paul, P. Schlagheck, P. Leboeuf, and N. Pavloff, Phys. Rev. Lett. 98, 210602 (2007)], we focus here on the supersonic stationary regime where Anderson localization exists. We generalize the diffusion formalism of Dorokhov-Mello-Pereyra-Kumar to include interaction effects. It is shown that interactions modify the localization length and also introduce a length scale L? for the disordered region, above which most of the realizations of the random potential lead to time-dependent flows. A Fokker-Planck equation for the probability density of the transmission coefficient that takes this effect into account is introduced and solved. The theoretical predictions are verified numerically for different types of disordered potentials. Experimental scenarios for observing our predictions are discussed.

Paul, T.; Albert, M.; Schlagheck, P.; Leboeuf, P.; Pavloff, N.

2009-09-01

359

Critical metal phase at the Anderson metal-insulator transition with Kondo impurities  

NASA Astrophysics Data System (ADS)

It is well known that magnetic impurities can change the symmetry class of disordered metallic systems by breaking spin and time-reversal symmetry. At low temperature, these symmetries can be restored by Kondo screening. It is also known that at the Anderson metal-insulator transition, wave functions develop multifractal fluctuations with power-law correlations. Here, we consider the interplay of these two effects. We show that multifractal correlations open local pseudogaps at the Fermi energy at some random positions in space. When dilute magnetic impurities are at these locations, Kondo screening is strongly suppressed. When the exchange coupling J is smaller than a certain value J^*, the metal-insulator transition point extends to a critical region in the disorder strength parameter and to a band of critical states. The width of this critical region increases with a power of the concentration of magnetic impurities. [S. Kettemann, E. R. Mucciolo, and I. Varga, Phys. Rev. Lett. 103, 126401 (2009).

Mucciolo, Eduardo; Kettemann, Stefan; Varga, Imre

2010-03-01

360

Two-Dimensional Graphene with Structural Defects: Elastic Mean Free Path, Minimum Conductivity, and Anderson Transition  

NASA Astrophysics Data System (ADS)

Quantum transport properties of disordered graphene with structural defects (Stone-Wales and divacancies) are investigated using a realistic ?-?* tight-binding model elaborated from ab initio calculations. Mean free paths and semiclassical conductivities are then computed as a function of the nature and density of defects (using an order-N real-space Kubo-Greenwood method). By increasing the defect density, the decay of the semiclassical conductivities is predicted to saturate to a minimum value of 4e2/?h over a large range (plateau) of carrier density (>0.5×1014cm-2). Additionally, strong contributions of quantum interferences suggest that the Anderson localization regime could be experimentally measurable for a defect density as low as 1%.

Lherbier, Aurélien; Dubois, Simon M.-M.; Declerck, Xavier; Roche, Stephan; Niquet, Yann-Michel; Charlier, Jean-Christophe

2011-01-01

361

Hydrothermal synthesis of two Anderson POM-supported transition metal organic–inorganic compounds  

Microsoft Academic Search

Two isostructural compounds based on Anderson polyoxoanions, [Cu(phen)]2[CrMo6H5O24] (1) and [Cu(phen)]2[AlMo6H5O24] (2) (phen=1,10-phenaanthroline), have been hydrothermally synthesized and characterized by IR, XPS, EPR spectra, TG analyses, magnetic susceptibility, and single-crystal X-ray diffraction. Compounds crystallize in the monoclinic space group P2(1)\\/n with a=5.66710(10)Å, b=21.3723(5)Å, c=14.7092(3)Å, ?=98.10(10)°, V=1763.79(6)Å3, R1=0.0240, Z=2 and GOF=1.140 for 1, and in the monoclinic space group P2(1)\\/n with

Hui-yuan Ma; Li-zhou Wu; Hai-jun Pang; Xin Meng; Jun Peng

2010-01-01

362

New supramolecular hybrids based on A-type Anderson polyoxometalates and Mn–Schiff-base complexes  

Microsoft Academic Search

By combination of metal–Schiff-base complexes and A-type Anderson heteropolymolybdates, two new metal–Schiff-base polyoxometalate hybrid compounds [Mn(salen)(H2O)2]2Na3[IMo6O24]·18H2O (1) and [Mn(salpn)(H2O)2]2Na3[IMo6O24]·10H2O (2) (salen=N,N?-ethylene-bis(salicylideneiminate) and salpn=N,N?-(1,3-propylene)bis(salicylideneiminate)) have been successfully isolated. Compounds 1 and 2 were characterized by the single crystal X-ray diffraction analysis, elemental analysis, IR spectroscopy, TG analyses and XPS spectra. Single-crystal X-ray diffraction analysis revealed that both compounds exhibit 3-D supramolecular

Qiong Wu; Shi-Wei Lin; Yang-Guang Li; En-Bo Wang

363

Anderson localization with second quantized fields in a coupled array of waveguides  

SciTech Connect

We report a theoretical study of Anderson localization of nonclassical light in an array of waveguides in which neighboring waveguides are evanescently coupled and in which the disorder can be added in a controlled manner. We use squeezed light at the input to investigate the effects of nonclassicality and compare the results with those obtained by using conventional classical fields, such as a coherent field and a Gaussian field. Our results show that there is an enhancement in fluctuations of localized light due to the medium's disorder. We find superbunching of the localized light, which may be useful for enhancing the interaction between radiation and matter. Another important consequence of sub-Poissonian statistics of the incoming light is to quench the total fluctuations at the output. Finally, we show that as a result of the multiplicative noise in the problem, the output field is far from Gaussian even if the input is a coherent field.

Thompson, Clinton; Vemuri, Gautam [Department of Physics, Indiana University-Purdue University Indianapolis (IUPUI) Indianapolis, Indiana 46202-3273 (United States); Agarwal, G. S. [Department of Physics, Oklahoma State University, Stillwater, Oklahoma 74078 (United States)

2010-11-15

364

Backbone structure of the Edwards-Anderson spin-glass model  

NASA Astrophysics Data System (ADS)

We study the ground-state spatial heterogeneities of the Edwards-Anderson spin-glass model with both bimodal and Gaussian bond distributions. We characterize these heterogeneities by using a general definition of bond rigidity, which allows us to classify the bonds of the system into two sets, the backbone and its complement, with very different properties. This generalizes to continuous distributions of bonds the well-known definition of a backbone for discrete bond distributions. By extensive numerical simulations we find that the topological structure of the backbone for a given lattice dimensionality is very similar for both discrete and continuous bond distributions. We then analyze how these heterogeneities influence the equilibrium properties at finite temperature and we discuss the possibility that a suitable backbone picture can be relevant to describe spin-glass phenomena.

Romá, F.; Risau-Gusman, S.

2013-10-01

365

Quantum resonance, Anderson localization, and selective manipulations in molecular mixtures by ultrashort laser pulses  

NASA Astrophysics Data System (ADS)

We show that the current laser technology used for field-free molecular alignment via impulsive Raman rotational excitation allows for observing long-discussed nonlinear quantum phenomena in the dynamics of the periodically kicked rotor. This includes the scaling of the absorbed energy near the conditions of quantum resonance and Anderson-like localization in the angular momentum. Based on this, we show that periodic trains of short laser pulses provide an efficient tool for selective rotational excitation and alignment in a molecular mixture. We demonstrate the efficiency of this approach by applying it to a mixture of two nitrogen isotopologues (14N2 and 15N2), and show that strong selectivity is possible even at room temperature.

Floß, Johannes; Averbukh, Ilya Sh.

2012-08-01

366

Decay of a nonlinear impurity in a structured continuum from a nonlinear Fano-Anderson model  

SciTech Connect

The decay dynamics of a nonlinear impurity mode embedded in a linear structured continuum is theoretically investigated in the framework of a nonlinear Fano-Anderson model. A gradient flow dynamics for the survival probability is derived in the Van Hove ({lambda}{sup 2}t) limit by a multiple-scale asymptotic analysis, and the role of nonlinearity on the decay law is discussed. In particular, it is shown that the existence of bound states embedded in the continuum acts as transient trapping states which slow down the decay. The dynamical behavior predicted in the {lambda}{sup 2}t limit is studied in detail for a simple tight-binding one-dimensional lattice model, which may describe electron or photon transport in condensed matter or photonic systems. Numerical simulations of the underlying equations confirm, in particular, the trapping effect in the decay process due to bound states embedded in the continuum.

Longhi, Stefano [Dipartimento di Fisica and Istituto di Fotonica e Nanotecnologie del CNR, Politecnico di Milano, Piazza Leonardo da Vinci 32, I-20133 Milan (Italy)

2007-05-01

367

1/( N - 1) expansion approach to full-counting statistics for the SU( N) Anderson model  

NASA Astrophysics Data System (ADS)

We apply a recently developed 1/( N - 1) expansion to the full-counting statistics for the N-fold degenerate Anderson impurity model in the Kondo regime. This approach is based on the perturbation theory in the Coulomb interaction U and is different from the conventional large- N theories, such as the usual 1/ N expansion and non-crossing approximation. We have confirmed that the calculations carried out up to order 1/( N - 1)2 agree closely with those of the numerical renormalization group at N = 4, where the degeneracy is still not so large. This ensures the applicability of our approach for N ? 4. We present the results of the cumulants of the probability distribution function for a nonequilibrium current through a quantum dot in the particle-hole symmetric case.

Oguri, Akira; Sakano, Rui

2013-08-01

368

One-dimensional Anderson Localization: distribution of wavefunction amplitude and phase at the band center  

SciTech Connect

The statistics of normalized wavefunctions in the one-dimensional (1d) Anderson model of localization is considered. It is shown that at any energy that corresponds to a rational filling factor f = (p/q) there is a statistical anomaly which is seen in expansion of the generating function (GF) to the order q-2 in the disorder parameter. We study in detail the principle anomaly at f = (1/2) that appears in the leading order. The transfer-matrix equation of the Fokker-Planck type with a two-dimensional internal space is derived for GF. It is shown that the zero-mode variant of this equation is integrable and a solution for the generating function is found in the thermodynamic limit.

Kravtsov, V. E. [Abdus Salam International Centre for Theoretical Physics, P.O.B. 586, 34100 Trieste (Italy); Yudson, V. I. [Landau Institute for Theoretical Physics, 2 Kosygina St., 117940 Moscow (Russian Federation)

2009-05-14

369

Fermi surface reconstruction in the Kondo lattice model and the periodic Anderson model  

NASA Astrophysics Data System (ADS)

We study the ground state properties of the Kondo lattice model (KLM) and the periodic Anderson model (PAM) in a two-dimensional square lattice with the variational Monte Carlo method. In addition to the conventional second-order antiferromagnetic transition, we find a novel type of quantum phase transition which induces the change of topology of the Fermi surface (Fermi surface reconstruction). The Fermi surface reconstruction is originated from the mechanism of the energy gain and is characteristic both of the KLM and of the PAM. We show the ground state phase diagrams of both models and discuss the relation to the recent experiments which have investigated the change of the Fermi surface.

Watanabe, Hiroshi; Ogata, Masao

2009-03-01

370

Finite size scaling of entanglement entropy at the Anderson transition with interactions  

NASA Astrophysics Data System (ADS)

We study the entanglement entropy(EE) of disordered one-dimensional spinless fermions with attractive interactions. With intensive numerical calculation of the EE using the density matrix renormalization group method, we find clear signatures of the transition between the localized and delocalized phase. In the delocalized phase, the fluctuations of the EE becomes minimum and independent of the system size. Meanwhile the EE's logarithmic scaling behavior is found to recover to that of a clean system. We present a general scheme of finite size scaling of the EE at the critical regime of the Anderson transition, from which we extract the critical parameters of the transition with good accuracy, including the critical exponent, critical point and a power-law divergent localization length.

Zhao, An

2013-03-01

371

High-energy neutron dosimetry at the Clinton P. Anderson Meson Physics Facility  

SciTech Connect

Neutron energy spectrum measurements performed at the Clinton P. Anderson Meson Physics Facility indicated potential areas for high energy neutron exposure to personnel. The low sensitivity of the Los Alamos thermoluminescent dosimeter (TLD) to high energy neutrons warranted issuing a NTA dosimeter in addition to the TLD badge to employees entering these areas. The dosimeter consists of a plastic holder surrounding NTA film that has been desiccated and sealed in a dry nitrogen environment. A study of the fading of latent images in NTA film demonstrated the success of this packaging method to control the phenomenon. The Los Alamos NTA dosimeter is characterized and the fading study discussed. 10 refs., 4 figs., 2 tabs.

Mallett, M.W.; Vasilik, D.G.; Littlejohn, G.J.; Cortez, J.R.

1990-01-01

372

ARPES in strongly correlated 4f and 5f systems: Comparison to the Periodic Anderson Model  

SciTech Connect

The electronic structure of both Ce and U heavy fermions appears to consist of extremely narrow, nearly temperature independent bands (i.e., no spectral weight loss or transfer with temperature). A small dispersion of the f-bands above the Kondo temperature is easily measurable so that a Kondo resonance, as defined by NCA, is not evident. Preliminary results, however, indicate that the Periodic Anderson Model captures some of the essential physics. Angle-integrated resonant photoemission results on {delta}-Pu indicate a narrow 5f feature at E{sub F}, similar in width to f-states in Ce and U compounds, but differing in that cross-section behavior of the near-E{sub F} feature suggests substantial 6D admixture.

Arko, A.J.; Joyce, J.J.; Cox, L.E. [and others

1997-12-01

373

Energy-level structure of zinc in magnetic fields using a single-band effective Hamiltonian. II. WKB treatment  

Microsoft Academic Search

A map of the zero-magnetic-field electronic-energy-band structure of the midplane of the second band of zinc contains four types of energy contours: (1) circular, (2) lens, (3) triangle, and (4) concave hexagon. The semiclassical theory of Onsager predicts that with a magnetic field imposed the allowed energy levels (Landau levels) correspond to contours whose areas are (n+Theta)e Bh c, where

P. S. Kapo; E. Brown

1974-01-01

374

Involvement of Difference in Decrease of Hemoglobin Level in Poor Prognosis of Stage I and II Nasopharyngeal Carcinoma: Implication in Outcome of Radiotherapy  

SciTech Connect

Purpose: To investigate the effect of hemoglobin (Hb) concentration and the difference in its decrease during treatment on outcome of radiotherapy (RT) alone for patients with Stage I and II nasopharyngeal carcinoma. Methods and Materials: A total of 572 patients with Stage I-II nasopharyngeal carcinoma with RT alone between January 2001 and December 2004 were retrospectively analyzed. Patient characteristics, tumor variables, and Hb level, including pre-RT Hb, mid-RT Hb, and dynamic change of Hb between pre- and post- RT and its difference in decrease ( White-Up-Pointing-Small-Triangle Hb) were subjected to univariate and multivariable analysis to identify factors that predict disease-specific survival (DSS), local regional recurrence-free survival (LRFS), and metastases-free survival (MFS). Results: The 5-year DSS was poorer in the Hb continuous decrease group than in the Hb noncontinuous decrease group (84% vs. 89%; p = 0.008). There was poorer 5-year DSS in patients with White-Up-Pointing-Small-Triangle Hb of >11.5 g/L than in those with White-Up-Pointing-Small-Triangle Hb of {<=}11.5 g/L (82% vs. 89%; p = 0.001), and poorer LRFS (79% vs. 83%; p = 0.035). Univariate and multivariate analysis showed that Hb decrease difference with greater than 11.5 g/L was an independent prognostic factor for DSS and LRFS. Conclusions: The difference in decrease of Hb level during the course of radiation treatment appeared as a poor prognostic factor in Stage I and II nasopharyngeal carcinoma patients.

Gao Jin [Department of Radiation Oncology, Cancer Center, Sun Yat-Sen University, Guangzhou (China); State Key Laboratory of Oncology in Southern China, Sun Yat-Sen University, Guangzhou (China); Department of Radiation Oncology, Anhui provincial hospital, Hefei (China); Tao Yalan; Li Guo; Yi Wei [Department of Radiation Oncology, Cancer Center, Sun Yat-Sen University, Guangzhou (China); State Key Laboratory of Oncology in Southern China, Sun Yat-Sen University, Guangzhou (China); Xia Yunfei, E-mail: xiayf@sysucc.org.cn [Department of Radiation Oncology, Cancer Center, Sun Yat-Sen University, Guangzhou (China); State Key Laboratory of Oncology in Southern China, Sun Yat-Sen University, Guangzhou (China)

2012-03-15

375

Experimental evidence of coupling between sheared-flow development and an increase in the level of turbulence in the TJ-II stellarator  

SciTech Connect

The link between the development of sheared flows and the structure of turbulence has been investigated in the plasma boundary region of the TJ-II stellarator. The development of the naturally occurring velocity shear layer requires a minimum plasma density. Near this critical density, the level of edge turbulent transport and the turbulent kinetic energy significantly increases in the plasma edge. The resulting shearing rate in the phase velocity of fluctuations is comparable to the one required to trigger a transition to improved confinement regimes with reduction of edge turbulence, suggesting that spontaneous sheared flows and fluctuations keep themselves near marginal stability. These findings provide the experimental evidence of coupling between sheared flows development and increasing in the level of edge turbulence. The experimental results are consistent with the expectations of second-order transition models of turbulence-driven sheared flows.

Hidalgo, C.; Pedrosa, M.A.; Garcia, L.; Ware, A. [Laboratorio Nacional de Fusion, Euratom-Ciemat, 28040 Madrid (Spain); Universidad Carlos III, 28911 Leganes, Madrid (Spain); University of Montana-Missoula, Missoula, Montana 59812 (United States)

2004-12-01

376

Binge-Like Ethanol Consumption Increases Corticosterone Levels and Neurodegneration whereas occupancy of Type II Glucocorticoid Receptors with Mifepristone is Neuroprotective  

PubMed Central

Excessive ethanol (EtOH) use leads to impaired memory and cognition. Using a rat model of binge-like intoxication, we tested whether elevated corticosterone (Cort) levels contribute to the neurotoxic consequences of EtOH exposure. Rats were adrenalectomized (Adx) and implanted with cholesterol pellets, or cholesterol pellets containing basal, medium or high Cort. Intragastric EtOH or an isocaloric control solution was given 3 times daily for 4 days to achieve blood alcohol levels (BALs) ranging between 200-350 mg/dl. Mean 24 hour (24-hr) plasma Cort levels were ~110 ng/ml and ~40 ng/ml in intact EtOH treated and intact control, respectively. Basal Cort replacement in EtOH-treated Adx animals animals did not exacerbate alcohol-induced neurodegeneration in the hippocampal dentate gyrus (DG) or the entorhinal cortex (EC) as observed by amino-cupric silver staining. In contrast, Cort replacement resulting in levels 2-fold higher (medium) than normal, or higher (high) in Adx-Cort-EtOH animals increased neurodegeneration. In separate experiments, pharmacological blockade of the Type II glucocortocoid (GC) receptor was initiated with mifepristone (RU38486; 0, 5, 15 mg/kg/day, i.p.). At the higher dose, mifepristone decreased the number of degenerating hippocampal DG cells in binge-EtOH treated intact animals, whereas, only a trend for reduction was observed in 15 mg/kg/day mifepristone treated animals in the EC, as determined by Fluoro Jade B staining. These results suggest that Cort in part mediates EtOH-induced neurotoxicity in the brain through activation of Type II GC receptors.

Cippitelli, Andrea; Damadzic, Ruslan; Hamelink, Carol; Brunnquell, Michael; Thorsell, Annika; Heilig, Markus; Eskay, Robert L

2012-01-01

377

Low Salt Intake and Changes in Serum Sodium Levels in the Combination Therapy of Low-Dose Hydrochlorothiazide and Angiotensin II Receptor Blocker.  

PubMed

Background:?The present study was conducted to examine the association of dietary salt intake with changes in serum sodium (srNa) levels when angiotensin II receptor blocker (ARB) treatment is changed to the combination of ARB plus low-dose diuretic (hydrochlorothiazide [HCTZ]). Methods and Results:?In 88 patients (age 70±12 years), ARB treatment was switched to the combination therapy (same dosage ARB+12.5mg/day HCTZ). The srNa level was measured before and 6 months after administration of the combination. The daily salt intake was estimated by the Kawasaki formula using second morning urine sample. The study subjects were divided into quintile ranges according to daily salt intake. The reduction in srNa levels by switching to the combination treatment was significant in subjects in the lowest quintile Q5 (?8.9g/day salt intake), but not in those in Q1-4 (28.1-9.3g/day salt intake). Increases in serum creatinine and uric acid levels were significantly larger in the former group than in the latter group. Conclusions:?In elderly Japanese subjects with low salt intake (<8.9g/day), the addition of a low-dose diuretic (12.5mg HCTZ) to ARB treatment causes significant reduction in srNa levels, which might affect blood osmolarity.??(Circ J?2013; 77: 2567-2572). PMID:23832512

Nakayama, Masafumi; Tomiyama, Hirofumi; Kuwajima, Iwao; Saito, Tetsushi; Hokama, Yohei; Fujii, Yuji; Shimizu, Tadanori; Nakayama, Tohru; Yamashina, Akira; Aizawa, Yoshifusa

2013-07-05

378

Level of aspiration as a method of studying personality. II. Development and evaluation of a controlled method  

Microsoft Academic Search

This study calls attention to the need to phrase instructions so that likelihood of misinterpretation is reduced. A simple motor task for measuring level of aspiration in human subjects is described. A steel ball is to be propelled along a wooden groove with a short cue-like rod so that the ball will stop as nearly as possible to the middle

J. B. Rotter

1942-01-01

379

DOSE-RESPONSE ASSESSMENT FOR DEVELOPMENT TOXICITY: II. COMPARISON OF GENERIC BENCHMARK DOSE ESTIMATES WITH NO OBSERVED ADVERSE EFFECT LEVELS  

EPA Science Inventory

Developmental toxicity risk assessment currently relies on the estimation of reference doses (RfDDTS) or reference concentrations (RfCDTS) based on the use of no observed adverse effect levels (NOAELS) divided by uncertainty factors (UFs)The benchmark dose (BUD) has been proposed...

380

JTPA Evaluation at the State and Local Level. Volume II: A General Planning Guide for State Users.  

ERIC Educational Resources Information Center

|This guide is intended to assist states and service delivery areas (SDAs) in addressing the new oversight responsibilities and opportunities stipulated by the Job Training Partnership Act (JTPA) with respect to planning a state-level evaluation. The following topics are covered in the individual chapters: the objectives and scope of JTPA…

Feldman, Deborah

381

High Na intake increases renal angiotensin II levels and reduces expression of the ACE2-AT2R-MasR axis in obese Zucker rats  

PubMed Central

High sodium intake is known to regulate the renal renin-angiotensin system (RAS) and is a risk factor for the pathogenesis of obesity-related hypertension. The complex nature of the RAS reveals that its various components may have opposing effects on natriuresis and blood pressure regulation. We hypothesized that high sodium intake differentially regulates and shifts a balance between opposing components of the renal RAS, namely, angiotensin-converting enzyme (ACE)-ANG II-type 1 ANG II receptor (AT1R) vs. AT2-ACE2-angiotensinogen (Ang) (1–7)-Mas receptor (MasR), in obesity. In the present study, we evaluated protein and/or mRNA expression of angiotensinogen, renin, AT1A/BR, ACE, AT2R, ACE2, and MasR in the kidney cortex following 2 wk of a 8% high-sodium (HS) diet in lean and obese Zucker rats. The expression data showed that the relative expression pattern of ACE and AT1BR increased, renin decreased, and ACE2, AT2R, and MasR remained unaltered in HS-fed lean rats. On the other hand, HS intake in obese rats caused an increase in the cortical expression of ACE, a decrease in ACE2, AT2R, and MasR, and no changes in renin and AT1R. The cortical levels of ANG II increased by threefold in obese rats on HS compared with obese rats on normal salt (NS), which was not different than in lean rats. The HS intake elevated mean arterial pressure in obese rats (27 mmHg) more than in lean rats (16 mmHg). This study suggests that HS intake causes a pronounced increase in ANG II levels and a reduction in the expression of the ACE2-AT2R-MasR axis in the kidney cortex of obese rats. We conclude that such changes may lead to the potentially unopposed function of AT1R, with its various cellular and physiological roles, including the contribution to the pathogenesis of obesity-related hypertension.

Samuel, Preethi; Ali, Quaisar; Sabuhi, Rifat; Wu, Yonnie

2012-01-01

382

High Na intake increases renal angiotensin II levels and reduces expression of the ACE2-AT(2)R-MasR axis in obese Zucker rats.  

PubMed

High sodium intake is known to regulate the renal renin-angiotensin system (RAS) and is a risk factor for the pathogenesis of obesity-related hypertension. The complex nature of the RAS reveals that its various components may have opposing effects on natriuresis and blood pressure regulation. We hypothesized that high sodium intake differentially regulates and shifts a balance between opposing components of the renal RAS, namely, angiotensin-converting enzyme (ACE)-ANG II-type 1 ANG II receptor (AT(1)R) vs. AT(2)-ACE2-angiotensinogen (Ang) (1-7)-Mas receptor (MasR), in obesity. In the present study, we evaluated protein and/or mRNA expression of angiotensinogen, renin, AT(1A/B)R, ACE, AT(2)R, ACE2, and MasR in the kidney cortex following 2 wk of a 8% high-sodium (HS) diet in lean and obese Zucker rats. The expression data showed that the relative expression pattern of ACE and AT(1B)R increased, renin decreased, and ACE2, AT(2)R, and MasR remained unaltered in HS-fed lean rats. On the other hand, HS intake in obese rats caused an increase in the cortical expression of ACE, a decrease in ACE2, AT(2)R, and MasR, and no changes in renin and AT(1)R. The cortical levels of ANG II increased by threefold in obese rats on HS compared with obese rats on normal salt (NS), which was not different than in lean rats. The HS intake elevated mean arterial pressure in obese rats (27 mmHg) more than in lean rats (16 mmHg). This study suggests that HS intake causes a pronounced increase in ANG II levels and a reduction in the expression of the ACE2-AT(2)R-MasR axis in the kidney cortex of obese rats. We conclude that such changes may lead to the potentially unopposed function of AT(1)R, with its various cellular and physiological roles, including the contribution to the pathogenesis of obesity-related hypertension. PMID:22592638

Samuel, Preethi; Ali, Quaisar; Sabuhi, Rifat; Wu, Yonnie; Hussain, Tahir

2012-05-16

383

Decreased levels of serum soluble complement receptor-II (CR2\\/CD21) in patients with rheumatoid arthritis  

Microsoft Academic Search

Objective. The soluble cluster of differentiation 21 (sCD21) represents the extracellular portion of the CD21 glycoprotein and is released by shedding from cell surfaces into plasma. Soluble CD21 binds complement fragments and activates monocytes through binding to membrane CD23. Elevated levels of sCD21 are found during Epstein-Barr virus EBV infections, B-cell lymphoma and other lymphoblastoid tumours. The present study was

M. Masilamani; J. von Kempis; H. Illges

2004-01-01

384

Dietary iodine and selenium affected the mRNA expression levels of skin monodeiodinase (II, III) in Liaoning Cashmere goats.  

PubMed

Livestock are frequently provided nutrient-depleted diets, which can negatively impact animal health and productivity. In our previous trial, we found that iodine (I) supplementation (not selenium (Se)) could increase cashmere production. In order to explore the role of I and Se in cashmere growth, we investigated the effects of dietary I and Se supplementation in Liaoning cashmere goats. Serum thyroid hormone status and the mRNA expression levels of skin monodeiodinase (MDII, MDIII) were measured during the cashmere fiber growth period. Forty-eight 2.5-year-old Liaoning cashmere goats (38.6 ± 2.65 kg BW) were divided into six equal groups, and their diets were supplemented with I (0, 2, or 4 mg/kg DM) and Se (0 or 1 mg/kg DM) in a 2 × 3 factorial treatment design. The six treatment groups were: I(0)Se(0), I(2)Se(0), I(4)Se(0), I(0)Se(1), I(2)Se(1), and I(4)Se(1). Concentrations of I and Se in the basal diet (group I(0)Se(0)) were 0.67 and 0.09 mg/kg DM, respectively. The trial started in September of 2009 and lasted 70 days. For every measured parameter, supplemental Se had no significant effect on thyroid hormones, but improved the mRNA expression levels of skin MDIII (P < 0.01). However, supplemental I increased levels of thyroid hormones (thyroxine and triiodothyronine) and improved the mRNA expression levels of skin MDII (P < 0.05). These results show that the addition of I to cashmere goat feedstock may be an effective means of increasing cashmere production through thyroid hormones regulating the mRNA expression of skin MDII. PMID:23274772

Qin, Feng; Li, Jianyun; Zhu, Xiaoping; Zhou, Jiaping; Yang, Jie; Jia, Zhihai

2012-12-30

385

Water pair potential of near spectroscopic accuracy. II. Vibration-rotation-tunneling levels of the water dimer  

Microsoft Academic Search

Nearly exact six-dimensional quantum calculations of the vibration-rotation-tunneling ~VRT! levels of the water dimer for values of the rotational quantum numbers J and K <2 show that the SAPT-5s water pair potential presented in the preceding paper ~paper I! gives a good representation of the experimental high-resolution far-infrared spectrum of the water dimer. After analyzing the sensitivity of the transition

G. C. Groenenboom; P. E. S. Wormer; A. van der Avoird; E. M. Mas; R. Bukowski; K. Szalewicz

386

Profile of iodine content of salt at trader level in the selected districts of India: Part II - Haryana.  

PubMed

Iodine Deficiency Disorders (IDD) are endemic in Haryana state. Since consuming iodized salt is the best way to prevent IDD, the government of Haryana under the National Iodine Deficiency Disorder Control Program (NIDDCP) has followed a policy of universal salt iodization (USI) since 1986, under which the state's population receives only iodized salt. However, despite this policy, the prevalence of IDD remains high in Haryana. UNICEF-PAMM-MI-WHO-ICCIDD recently recommended monitoring the iodine content of salt at the trader level as a means of assessing the quality of salt being consumed by the population. The authors assessed the iodine content and types of iodized salt being sold by traders in 13 of Haryana's 16 districts. Analysis of a total 117 salt samples from 117 traders using the standard iodometric titration method found all but one sample to contain some iodine. 20% of the traders, however, were selling salt containing less than 15 ppm of iodine, below the state government recommended minimum level of salt iodization for the retail level. PMID:12292802

Kapil, U; Nayar, D; Singh, C

387

Modeling Improvements for Air Source Heat Pumps using Different Expansion Devices at Varied Charge Levels Part II  

SciTech Connect

This paper describes steady-state performance simulations performed on a 3-ton R-22 split heat pump in heating mode. In total, 150 steady-state points were simulated, which covers refrigerant charge levels from 70 % to 130% relative to the nominal value, the outdoor temperatures at 17 F (-8.3 C), 35 F (1.7 C) and 47 F (8.3 C), indoor air flow rates from 60% to 150% of the rated air flow rate, and two types of expansion devices (fixed orifice and thermostatic expansion valve). A charge tuning method, which is to calibrate the charge inventory model based on measurements at two operation conditions, was applied and shown to improve the system simulation accuracy significantly in an extensive range of charge levels. In addition, we discuss the effects of suction line accumulator in modeling a heat pump system using either a fixed orifice or thermal expansion valve. Last, we identify the issue of refrigerant mass flow mal-distribution at low charge levels and propose an improved modeling approach.

Shen, Bo [ORNL

2011-01-01

388

Sleep-Dependent Synaptic Down-Selection (II): Single-Neuron Level Benefits for Matching, Selectivity, and Specificity  

PubMed Central

In a companion paper (1), we used computer simulations to show that a strategy of activity-dependent, on-line net synaptic potentiation during wake, followed by off-line synaptic depression during sleep, can provide a parsimonious account for several memory benefits of sleep at the systems level, including the consolidation of procedural and declarative memories, gist extraction, and integration of new with old memories. In this paper, we consider the theoretical benefits of this two-step process at the single-neuron level and employ the theoretical notion of Matching between brain and environment to measure how this process increases the ability of the neuron to capture regularities in the environment and model them internally. We show that down-selection during sleep is beneficial for increasing or restoring Matching after learning, after integrating new with old memories, and after forgetting irrelevant material. By contrast, alternative schemes, such as additional potentiation in wake, potentiation in sleep, or synaptic renormalization in wake, decrease Matching. We also argue that, by selecting appropriate loops through the brain that tie feedforward synapses with feedback ones in the same dendritic domain, different subsets of neurons can learn to specialize for different contingencies and form sequences of nested perception-action loops. By potentiating such loops when interacting with the environment in wake, and depressing them when disconnected from the environment in sleep, neurons can learn to match the long-term statistical structure of the environment while avoiding spurious modes of functioning and catastrophic interference. Finally, such a two-step process has the additional benefit of desaturating the neuron’s ability to learn and of maintaining cellular homeostasis. Thus, sleep-dependent synaptic renormalization offers a parsimonious account for both cellular and systems level effects of sleep on learning and memory.

Hashmi, Atif; Nere, Andrew; Tononi, Giulio

2013-01-01

389

Sleep-Dependent Synaptic Down-Selection (II): Single-Neuron Level Benefits for Matching, Selectivity, and Specificity.  

PubMed

In a companion paper (1), we used computer simulations to show that a strategy of activity-dependent, on-line net synaptic potentiation during wake, followed by off-line synaptic depression during sleep, can provide a parsimonious account for several memory benefits of sleep at the systems level, including the consolidation of procedural and declarative memories, gist extraction, and integration of new with old memories. In this paper, we consider the theoretical benefits of this two-step process at the single-neuron level and employ the theoretical notion of Matching between brain and environment to measure how this process increases the ability of the neuron to capture regularities in the environment and model them internally. We show that down-selection during sleep is beneficial for increasing or restoring Matching after learning, after integrating new with old memories, and after forgetting irrelevant material. By contrast, alternative schemes, such as additional potentiation in wake, potentiation in sleep, or synaptic renormalization in wake, decrease Matching. We also argue that, by selecting appropriate loops through the brain that tie feedforward synapses with feedback ones in the same dendritic domain, different subsets of neurons can learn to specialize for different contingencies and form sequences of nested perception-action loops. By potentiating such loops when interacting with the environment in wake, and depressing them when disconnected from the environment in sleep, neurons can learn to match the long-term statistical structure of the environment while avoiding spurious modes of functioning and catastrophic interference. Finally, such a two-step process has the additional benefit of desaturating the neuron's ability to learn and of maintaining cellular homeostasis. Thus, sleep-dependent synaptic renormalization offers a parsimonious account for both cellular and systems level effects of sleep on learning and memory. PMID:24151486

Hashmi, Atif; Nere, Andrew; Tononi, Giulio

2013-10-04

390

Nocturnal Low-Level Jet in a Mountain Basin Complex. Part II: Transport and Diffusion of Tracer under Stable Conditions  

SciTech Connect

Differences in nighttime transport and diffusion of sulfur hexafluoride (SF6) tracer in an urban complex-terrain setting (Salt Lake City, Utah) are investigated using surface and Dopplerlidar wind data, and large-scale surface pressure differences. Interacting scales of motion, as studied through the URBAN 2000 field program combined with the Vertical Transport and Mixing Experiment (VTMX), explained the differences in the tracer behavior during three separate Intensive Operating Periods (IOPs). With an emphasis on nighttime stable boundary layer conditions, these field programs were designed to study flow features responsible for the nighttime transport of airborne substances. This transport has implications for air quality, homeland security, and emergency response issues if the airborne substances are hazardous. The important flow features investigated included thermally forced canyon and slope flows and a low-level jet (LLJ) that dominated the basin-scale winds when the surface pressure gradient was weak. The presence of thermally forced flows contributed to the complexity and hindered the predictability of the tracer motion within and beyond the city. When organized thermally forced flows were present, the tracer tended to stay closer to the city for longer periods of time, even though a strong basin-scale LLJ did develop. When thermally forced flows were short-lived or absent, the basin-scale low-level jet dominated the wind field and enhanced the transport of tracer material out of the city.

Darby, Lisa S.; Allwine, K Jerry; Banta, Robert M.

2006-05-01

391

Multicenter field trial on possible health effects of toluene. II. Cross-sectional evaluation of acute low-level exposure.  

PubMed

Data on possible acute effects of today's relevant low-level exposure to toluene are contradictory, and information on possible effects of exposure under occupational conditions is largely lacking. In a controlled, multi-center, blinded field trial, effects possibly associated with acute toluene exposure were evaluated in workers of 12 German rotogravure factories. Medical examinations (inquiries on subjective symptoms, and standard tests of psycho-physiological and psycho-motor functions) were performed on almost 1500 volunteers, of whom 1290 were toluene-exposed (1178 men and 112 women), and about 200 participants served as references (157 men and 37 women), but the main aim of the trial was to reveal dose-response relationships. All volunteers were of the morning work-shift (6 h exposure). Both individual ambient air concentrations (time-weighted average) during the work-shift, as well as blood toluene concentrations after the work-shift were measured. Therefore, the medical data could for the first time be correlated with the actual individual body burden (blood toluene level) at the time of testing. In order to largely exclude confounding by chronic toluene exposure, kinetic measurements as well as the psycho-physiological and psycho-motoric tests were performed before and after the work-shift. Except for minor statistical deviations, neither convincing dose-dependent acute effects could be demonstrated with regression analyses in male volunteers at the exposure levels evaluated, nor were significant differences found when applying group statistics (highly toluene-exposed group versus volunteers with negligible exposure). Due to the rather large number of participants, the predictive power of the study is high, especially when compared with previous publications. In two psycho-physiological tests, a few more female volunteers with quite low toluene body burdens (<340 microg/l blood) showed relatively low scores when compared with participants of the reference group. Although evidence for a medical relevance is meager, the small numbers of participants, in both the exposure and the reference groups, hamper a reliable interpretation of the results concerning exposure levels above 85 microg toluene/l blood, and it is difficult to take confounding factors adequately into account. For the end points evaluated and under occupational conditions, neither blood toluene levels of 850 to 1700 microg/l (in the highest exposure group [EXPO-IV] with 56 participants), as measured 1/2 (+/-1/2) h after the work-shift, nor ambient air concentrations (time-weighted average over 6 h) between 50 and 100 ppm (188-375 mg/m(3)) were convincingly associated with alterations in psycho-physiological and psycho-motoric performances or increased the frequency of subjective complaints in male volunteers. For higher dose ranges of toluene exposure (i.e. >1700 microg toluene/l blood [or >100 ppm in ambient air]), our data set is too small for far reaching conclusions. Our data are insufficient for conclusions on a possibly higher susceptibility to toluene of some female workers. Results of kinetic studies and possible effects of long-term exposure are discussed in two accompanying publications (Neubert et al., 2001; Gericke et al., 2001). PMID:11641006

Neubert, D; Gericke, C; Hanke, B; Beckmann, G; Baltes, M M; Kühl, K P; Bochert, G; Hartmann, J

2001-11-15

392

A novel magnetic ion imprinted nano-polymer for selective separation and determination of low levels of mercury(II) ions in fish samples.  

PubMed

In this work a novel ion imprinted polymer (IIP) based on N-(pyridin-2-ylmethyl)ethenamine (V-Pic) was coated on Fe3O4 nano-particles and characterized by thermal gravimetric and differential thermal analysis (TG/DTA), IR spectroscopy, Scanning electron microscopy (SEM) and also elemental analysis. The application of this novel magnetic sorbent was investigated in rapid extraction, preconcentration and also determination of trace amounts of Hg(II) ions by inductively coupled plasma-optical emission spectrometry (ICP-OES). Effect of various parameters such as sample pH, adsorption time and desorption time, maximum capacity and also eluent type and concentration was investigated in this study. The relative standard deviation (RSD%) and limit of detection (LOD) of the method were found to be 1.47% and 0.03ngmL(-1), respectively. The amounts of mercury in some standard reference materials was Also determined using this sorbent in order to confirm the accuracy of this method. Finally, this sorbent was successfully applied for determination of low levels of Hg(II) ions in various fish samples. PMID:23993582

Najafi, Ezzatolla; Aboufazeli, Forouzan; Lotfi Zadeh Zhad, Hamid Reza; Sadeghi, Omid; Amani, Vahid

2013-07-04

393

Toxicity of oxidized fats II: tissue levels of lipid peroxides in rats fed a thermally oxidized corn oil diet.  

PubMed

Male Wistar albino rats were fed for 21 days on a diet in which fat (12%) was included either as fresh corn oil, malonaldehyde content = 0.11+/-0.05 micro microg/g (control) or thermally oxidized corn oil, malonaldehyde content = 0.20+/-0.03 microg/g (experimental) and the tissue levels of lipid peroxides in six organs-namely, liver, kidney, brain, heart, lungs and testes-were determined. Of the organs studied, significantly (P < 0.1) higher concentrations of lipid peroxides were observed only in the liver and kidney of the experimental rats. In the course of the feeding, the experimental rats showed significantly (P < 0.1) lower gains in body weights as well as higher relative liver weights than the control rats. PMID:10418956

Nwanguma, B C; Achebe, A C; Ezeanyika, L U; Eze, L C

1999-04-01

394

Nucleation features and energy levels of type-II InAsSbP quantum dots grown on InAs(100) substrate  

NASA Astrophysics Data System (ADS)

The nucleation features and measurements of holes energy levels of the InAsSbP type-II quantum dots (QDs) with respect to the InAs valence band edge by employing magnetospectroscopy and a photo- and electroluminescence measurements are reported. Three samples are prepared for investigations. The first and second samples consist of unencapsulated spherical and ellipsoidal QDs, respectively. Third sample is a n-InAs/p-InAsSbP heterostructure with QDs embedded into the p-n junction interface. The measured value for the holes first state is ~33 meV above the InAs valence band. The hysteresis of 0.483 pF and contra-directional oscillations on the first sample's capacitance-voltage characteristic is detected.

Gambaryan, K. M.; Aroutiounian, V. M.; Harutyunyan, V. G.

2012-08-01

395

Increased levels of serum leptin are a risk factor for the recurrence of stage I/II hepatocellular carcinoma after curative treatment  

PubMed Central

Obesity and related adipocytokine disbalance increase the risk of hepatocellular carcinoma. To determine the impact of increased levels of leptin, an obesity-related adipocytokine, on the recurrence of hepatocellular carcinoma, we conducted a prospective case-series analysis. Eighty-five consecutive primary hepatocellular carcinoma patients at our hospital from January 2006 to December 2008 were analyzed. Serum leptin level significantly correlated with Body Mass Index, total body fat, and the amount of subcutaneous fat. They included 33 with stage I/II, who underwent curative treatment. The factors contributing to recurrence of hepatocellular carcinoma, including leptin, were subjected to univariate and multivariate analyses using the Cox proportional hazards model. Body Mass Index (p = 0.0062), total body fat (p = 0.0404), albumin (p = 0.0210), ?-fetoprotein (p = 0.0365), and leptin (p = 0.0003) were significantly associated with the recurrence of hepatocellular carcinoma in univariate analysis. Multivariate analysis suggested that leptin (hazard ratio 1.25, 95% CI 1.07–1.49, p = 0.0035) was a sole independent predictor. Kaplan-Meier analysis showed that recurrence-free survival was lower in patients with greater serum leptin concentrations (>5 ng/mL, p = 0.0221). These results suggest that the serum leptin level is a useful biomarker for predicting the early recurrence of hepatocellular carcinoma.

Watanabe, Naoki; Takai, Koji; Imai, Kenji; Shimizu, Masahito; Naiki, Takafumi; Nagaki, Masahito; Moriwaki, Hisataka

2011-01-01

396

Increased levels of serum leptin are a risk factor for the recurrence of stage I/II hepatocellular carcinoma after curative treatment.  

PubMed

Obesity and related adipocytokine disbalance increase the risk of hepatocellular carcinoma. To determine the impact of increased levels of leptin, an obesity-related adipocytokine, on the recurrence of hepatocellular carcinoma, we conducted a prospective case-series analysis. Eighty-five consecutive primary hepatocellular carcinoma patients at our hospital from January 2006 to December 2008 were analyzed. Serum leptin level significantly correlated with Body Mass Index, total body fat, and the amount of subcutaneous fat. They included 33 with stage I/II, who underwent curative treatment. The factors contributing to recurrence of hepatocellular carcinoma, including leptin, were subjected to univariate and multivariate analyses using the Cox proportional hazards model. Body Mass Index (p = 0.0062), total body fat (p = 0.0404), albumin (p = 0.0210), ?-fetoprotein (p = 0.0365), and leptin (p = 0.0003) were significantly associated with the recurrence of hepatocellular carcinoma in univariate analysis. Multivariate analysis suggested that leptin (hazard ratio 1.25, 95% CI 1.07-1.49, p = 0.0035) was a sole independent predictor. Kaplan-Meier analysis showed that recurrence-free survival was lower in patients with greater serum leptin concentrations (>5 ng/mL, p = 0.0221). These results suggest that the serum leptin level is a useful biomarker for predicting the early recurrence of hepatocellular carcinoma. PMID:22128212

Watanabe, Naoki; Takai, Koji; Imai, Kenji; Shimizu, Masahito; Naiki, Takafumi; Nagaki, Masahito; Moriwaki, Hisataka

2011-10-29

397

Visual test of subparts per billion-level copper(II) by Fe3O4 magnetic nanoparticle-based solid phase extraction coupled with a functionalized gold nanoparticle probe.  

PubMed

By combining Fe(3)O(4) magnetic nanoparticle-based solid phase extraction with a gold nanoparticle-based visual test, a novel method was developed for the field assay of Cu(ii) in environmental water at subparts per billion-levels within 30 min. When a 200 mL water sample was treated with 12.5 mg L(-1) Fe(3)O(4) nanoparticles by the proposed procedure, the detection limit with the naked eye was 0.2 ?g L(-1) Cu(ii). The proposed method is very specific to Cu(ii), with tolerance against at least 100-fold amounts of other environmentally relevant metal ions except for Hg(ii) (25-fold), and was successfully applied to the detection of trace Cu(ii) in tap water, river water, and treated wastewater, and results agreed well with that determined by inductively coupled plasma-mass spectrometry (ICP-MS). PMID:23026855

Tan, Zhi-qiang; Liu, Jing-fu; Jiang, Gui-bin

2012-10-01

398

Extending the Newns-Anderson model to allow nanotransport studies through molecules with floppy degrees of freedom  

NASA Astrophysics Data System (ADS)

The Newns-Anderson model is ubiquitous in studies of the molecular transport in the presence of solvent (outer) reorganization. The present work demonstrates that intramolecular reorganization can also be significant for the transport through molecules with floppy degrees of freedom, for which the Newns-Anderson model can be extended. The expressions of the model parameters deduced from electronic structure calculations for (4, 4')-bipyridine (44BPY) quantitatively differ from those characteristic for outer reorganization due to strong intramolecular anharmonicities. These expressions can be utilized as input in transport calculations for 44BPY-based molecular junctions of experimental interest (Xu B. and Tao N. J., Science, 301 (2003) 1221; Pobelov I. V. et al., J. Am. Chem. Soc., 130 (2008) 16045; Widawsky J. R. et al., Nano Lett., 12 (2012) 354).

Bâldea, Ioan

2012-08-01

399

Phase relaxation in slowly changing environments: Evaluation of the Kubo-Anderson model for a continuous-time random walk  

NASA Astrophysics Data System (ADS)

The Kubo-Anderson model is a stochastic model of phase relaxation of an ensemble of systems in a fluctuating environment. This model is usually studied under the assumption that the system-environment interaction is a Gaussian stochastic process. This assumption only holds if the environment changes a very large number of times on the time scale of the system's motion. This paper reviews our work on the Kubo-Anderson model for the case where this interaction is a continuous-time random walk. A continuous-time random walk is a simple model for a `slowly changing environment', i.e., one which makes a relatively small number of changes on the time scale of the system's motion. We present the key results from this model and show how to apply them to common problems in magnetic resonance spectroscopy and and non-linear optical spectroscopy.

Packwood, Daniel M.

2013-02-01

400

The element level time domain (ELTD) method for the analysis of nano-optical systems: II. Dispersive media  

NASA Astrophysics Data System (ADS)

We study a 3-dimensional, dual-field, fully explicit method for the solution of dispersive Maxwell's equations in the time domain on unstructured, tetrahedral grids. In a previous paper, we investigated the element level time domain (ELTD) algorithm for solving electromagnetic problems with parameters independent of the excitation frequency content, i.e. nondispersive materials. The suitability of the ELTD method for the numerical analysis of nanometer structured systems in the optical frequencies was thoroughly studied. This paper introduces the generalization of the method and its implementation as a computer code for problems with dispersive material properties. We profit from the ELTD formulation in conjunction with the auxiliary differential equation (ADE) approach for modeling dispersion. Examples with analytical solutions are solved and verified in order to benchmark the method. Eventually, to demonstrate the potential of the method, we consider the structure of a single field emitter and solve for the electromagnetic fields when illuminated by a plane wave. We have obtained a flexible and versatile method of 2nd order accuracy that is applicable to both dispersive and nondispersive problems with a wide range of nano-optical configurations.

Fallahi, Arya; Oswald, Benedikt

2012-04-01

401

Plasma brain natriuretic peptide level as a biochemical marker of morbidity and mortality in patients with asymptomatic or minimally symptomatic left ventricular dysfunction. Comparison with plasma angiotensin II and endothelin-1  

Microsoft Academic Search

Aims To evaluate the level of plasma brain natriuretic peptide as a predictor of morbidity and mortality in patients with asymptomatic or minimally symptomatic left ventricular dysfunction. Methods We measured plasma levels of atrial natriuretic peptide, brain natriuretic peptide, norepinephrine, angio- tensin II, and endothelin-1 and monitored haemodynamic parameters in 290 consecutive patients with asymptomatic or minimally and newly symptomatic

T. Tsutamoto; A. Wada; K. Maeda; T. Hisanaga; N. Mabuchi; M. Hayashi; M. Ohnishi; M. Sawaki; M. Fujii; H. Horie; Y. Sugimoto; M. Kinoshita

1999-01-01

402

Anderson-Fabry disease: clinical manifestations and impact of disease in a cohort of 60 obligate carrier females  

Microsoft Academic Search

EDITOR—Anderson-Fabry disease (AFD) is a sphingolipid storage disorder resulting from the deficiency of the lysosomal enzyme Æ-galactosidase. Unlike most other lysosomal diseases, the inheritance is X linked. Disease manifestations in female heterozygotes have been reported, but are considered to be rare and usually mild. 1 Asymptomatic corneal dystrophy (cornea verticillata and posterior lenticular cataract) is present in about 70% and

K D MacDermot; A Holmes; A H Miners

2001-01-01

403

Babies, Child Bearers and Commodification: Anderson, Brazier et al., and the Political Economy of Commercial Surrogate Motherhood  

Microsoft Academic Search

It is argued by Anderson and also in the BrazierReport that Commercial Surrogate Motherhood (C.S.M.)contracts and agencies should be illegal on thegrounds that C.S.M. involves the commodification ofboth mothers and babies. This paper takes issue withthis view and argues that C.S.M. is not inconsistentwith the proper respect for, and treatment of,children and women. A case for the legalisation ofC.S.M. is

Hugh V. McLachlan; J. K. Swales

2000-01-01

404

Babies, child bearers and commodification: Anderson, Brazier et al., and the political economy of commercial surrogate motherhood.  

PubMed

It is argued by Anderson and also in the Brazier Report that Commercial Surrogate Motherhood (C.S.M.) contracts and agencies should be illegal on the grounds that C.S.M. involves the commodification of both mothers and babies. This paper takes issue with this view and argues that C.S.M. is not inconsistent with the proper respect for, and treatment of, children and women. A case for the legalization of C.S.M. is made. PMID:10977156

McLachlan, H V; Swales, J K

2000-01-01

405

Relaxational dynamics of the Edwards-Anderson model and the mean-field theory of spin-glasses  

Microsoft Academic Search

Langevin equations for the relaxation of spin fluctuations in a soft-spin version of the Edwards-Anderson model are used as a starting point for the study of the dynamic and static properties of spin-glasses. An exact uniform Lagrangian for the average dynamic correlation and response functions is derived for arbitrary range of random exchange, using a functional-integral method proposed by De

H. Sompolinsky; Annette Zippelius

1982-01-01

406

Nailing the Coffin Shut on Doubts That Violent Video Games Stimulate Aggression: Comment on Anderson et al. (2010)  

Microsoft Academic Search

Over the past half century the mass media, including video games, have become important socializers of children. Observational learning theory has evolved into social–cognitive information processing models that explain that what a child observes in any venue has both short-term and long-term influences on the child’s behaviors and cognitions. C. A. Anderson et al.’s (2010) extensive meta-analysis of the effects

L. Rowell Huesmann

2010-01-01

407

MD Anderson study finds lung cancer patients live longer if they use beta-blockers while receiving radiotherapy  

Cancer.gov

Patients with non-small-cell lung cancer survive longer if they are taking beta-blockers while receiving radiotherapy, according to a study of 722 patients published in the cancer journal Annals of Oncology. Researchers at the University of Texas MD Anderson Cancer Center reviewed the progress and outcomes of patients who had received radiotherapy as their main or first line of treatment for cancer.

408

Exact solution for eigenfunction statistics at the center-of-band anomaly in the Anderson localization model  

NASA Astrophysics Data System (ADS)

An exact solution is found for the problem of the center-of-band (E=0) anomaly in the one-dimensional Anderson model of localization. By deriving and solving an equation for the generating function ?(u,?) we obtained an exact expression in quadratures for statistical moments Iq=?|?E(r)|2q? of normalized wave functions ?E(r) which show violation of one-parameter scaling and emergence of an additional length scale at E?0 .

Kravtsov, V. E.; Yudson, V. I.

2010-11-01

409

MD Anderson study finds weekly dose reduces a targeted drug's side effects but not its activity against acute lymphocytic leukemia  

Cancer.gov

A potent chemotherapy agent wrapped within a monoclonal antibody selectively destroys the malignant cells responsible for acute lymphocytic leukemia (ALL) in either weekly or monthly dosing, researchers report at the 54th ASH Annual Meeting and Exposition. This "Trojan horse" assault on the cancer cells has significantly increased the response rate among patients with ALL, and now an MD Anderson Cancer Center clinical trial finds that weekly dosing works well and reduces side effects.

410

A detailed pathologic examination of heart tissue from three older patients with Anderson–Fabry disease on enzyme replacement therapy  

Microsoft Academic Search

BackgroundCardiac disease causes considerable morbidity and mortality in men and women with Anderson–Fabry disease (AFD), an X-linked inborn metabolic defect caused by deficiency of the lysosomal enzyme ?-galactosidase A. Treatment with recombinant enzyme preparations aims to attenuate and reverse accumulation of the major enzyme substrate, globotriaosylceramide (Gb3). Pathologic data examining the effect of enzyme replacement therapy (ERT) in vivo are

Mary N. Sheppard; Paul Cane; Richard Florio; Nicholas Kavantzas; Lydia Close; Jaymin Shah; Philip Lee; Perry Elliott

2010-01-01

411

Enzyme Replacement Therapy in Orphan and Ultra-Orphan Diseases: The Limitations of Standard Economic Metrics as Exemplified by Fabry-Anderson Disease  

Microsoft Academic Search

Background: Fabry-Anderson disease is an x-linked deficiency of lysosomal alpha-galactosidase A (GALA), resulting in chronic renal failure, cardiac arrhythmia, hypertrophy, valvular disease, pain (acro-paraesthesiae) and stroke, together with premature mortality. The disease has a significant impact on quality of life (QOL), as illustrated by studies using the EQ-5D. A specific treatment is available for Fabry-Anderson disease consisting of intravenous enzyme

David F. Moore; Markus Ries; Evelyn L. Forget; Raphael Schiffmann

2007-01-01

412

Effects of band filling in the Anderson-Falicov-Kimball model  

NASA Astrophysics Data System (ADS)

In this work, we study the Anderson-Falicov-Kimball model within the dynamical mean field theory for the Bethe lattice, restricting our analysis to the nonmagnetic case. The one-particle density of states is obtained by both arithmetic and geometric averages over disorder, since only the latter can detect localization in the absence of an energy gap. Varying the strengths of Coulomb interaction and disorder at zero temperature, we construct phase diagrams for this model, where we distinguish spectral regions with localized states, with extended states, or with a correlation-induced gap. With this, we identify metal-insulator transitions driven by correlation and disorder, as well as the competition between these effects. This is done for various band fillings, since our main interest here is to study how the variation of the electron density affects the phase diagrams previously obtained for half-filling. The picture revealed by the density of states is further checked by evaluating the static and dynamic conductivities, including temperature effects.

Carvalho, Rubens D. B.; Gusmão, M. A.

2013-02-01

413

Da Vinci robot assisted Anderson-Hynes dismembered pyeloplasty: technique and 1 year follow-up.  

PubMed

In experienced hands, laparoscopic pyeloplasty is an effective alternative treatment for symptomatic ureteropelvic junction obstruction (UPJO). Although laparoscopic surgery can clearly benefit patients, laparoscopic pyeloplasty using conventional instrumentation is complex. The purpose of this report is to evaluate the feasibility of robot assisted laparoscopic surgery. Eleven pyeloplasties for UPJO were performed via a laparoscopic transperitoneal approach exclusively with the da Vinci Surgical System. The mean procedure time was 197 min (range 110-310 min). All operations were completed laparoscopically with no intraoperative complications and negligible blood loss. All patients recovered rapidly after surgery with excellent functional results at the 1 year follow-up. Our initial experience suggests that robot assisted Anderson-Hynes pyeloplasty is a safe and effective alternative to conventional laparoscopic surgery. In our opinion, robot assisted surgery will allow urologists to perform complex procedures with greater precision, confidence, and better results, as well as enable them to adapt the whole spectrum of laparoscopic procedures to their field. PMID:12942276

Bentas, Wassilios; Wolfram, Marc; Bräutigam, Ronald; Probst, Michael; Beecken, Wolf-Dietrich; Jonas, Dietger; Binder, Jochen

2003-07-09

414

Organic–inorganic hybrids constructed by Anderson-type polyoxoanions and copper coordination complexes  

Microsoft Academic Search

Four organic–inorganic hybrid compounds based on Anderson-type polyoxoanions, namely, {[Cu(2,2?-bpy)(H2O)3]2[Cr(OH)6Mo6O18]}{[Cu(2,2?-bpy)(H2O)Cl][Cu(2,2?-bpy)(H2O)(NO3)][Cr(OH)6Mo6O18]}·18H2O (1), [Cu(2,2?-bpy)(H2O)2Cl]{[Cu(2,2?-bpy)(H2O)2][Cr(OH)6Mo6O18]}·4H2O (2), (H3O){[Cu(2,2?-bpy)(H2O)2]2[Cu(2,2?-bpy)(H2O)]2}[Cr(OH)6Mo6O18]3·36H2O (3), and (H3O){[Cu(2,2?-bpy)(H2O)2]2[Cu(2,2?-bpy)(H2O)]2}[Al(OH)6Mo6O18]3·33H2O (4), were isolated by conventional solution method, and crystal structures have been determined by single-crystal X-ray diffraction. Among them, compound 1 displays a discrete supramolecular structure, compound 2 shows a chainlike structure with chloro-copper complexes as counteranions, and compounds 3 and 4 are

Rui-Ge Cao; Shu-Xia Liu; Ying Liu; Qun Tang; Liang Wang; Lin-Hua Xie; Zhong-Min Su

2009-01-01

415

The Thouless Anderson Palmer equation for an analogue neural network with temporally fluctuating white synaptic noise  

NASA Astrophysics Data System (ADS)

Effects of synaptic noise on the retrieval process of associative memory neural networks are studied from the viewpoint of neurobiological and biophysical understanding of information processing in the brain. We investigate the statistical mechanical properties of stochastic analogue neural networks with temporally fluctuating synaptic noise, which is assumed to be white noise. Such networks, in general, defy the use of the replica method, since they have no energy concept. The self-consistent signal-to-noise analysis (SCSNA), which is an alternative to the replica method for deriving a set of order parameter equations, requires no energy concept and thus becomes available in studying networks without energy functions. Applying the SCSNA to stochastic networks requires the knowledge of the Thouless-Anderson-Palmer (TAP) equation which defines the deterministic networks equivalent to the original stochastic ones. The study of the TAP equation which is of particular interest for the case without energy concept is very less, while it is closely related to the SCSNA in the case with energy concept. This paper aims to derive the TAP equation for networks with synaptic noise together with a set of order parameter equations by a hybrid use of the cavity method and the SCSNA.

Ichiki, Akihisa; Shiino, Masatoshi

2007-08-01

416

Non-conventional Anderson localization in a matched quarter stack with metamaterials  

NASA Astrophysics Data System (ADS)

We study the problem of non-conventional Anderson localization emerging in bilayer periodic-on-average structures with alternating layers of materials, with positive and negative refraction indices na and nb. Attention is paid to the model of the so-called quarter stack with perfectly matched layers (the same unperturbed by disorder impedances, Za = Zb, and optical path lengths, nada = |nb|db, with da and db being the thicknesses of basic layers). As was recently numerically discovered, in such structures with weak fluctuations of refractive indices (compositional disorder), the localization length Lloc is enormously large in comparison to the conventional localization occurring in the structures with positive refraction indices only. In this paper we develop a new approach, which allows us to derive the expression for Lloc for weak disorder and any wave frequency ?. In the limit ? ? 0 one gets a quite specific dependence, L-1loc??4?8, which is obtained within the fourth order of perturbation theory. We also analyze the interplay between two types of disorder, when in addition to the fluctuations of na and nb, the thicknesses da and db slightly fluctuate as well (positional disorder). We show how conventional localization recovers with the addition of positional disorder.

Torres-Herrera, E. J.; Izrailev, F. M.; Makarov, N. M.

2013-05-01

417

Water-quality assessment of the Middle Fork Anderson River watershed, Crawford and Perry Counties, Indiana  

USGS Publications Warehouse

This report, on water quality for streams in Crawford and Perry Counties, Indiana, defines the variation in concentrations of nutrients, inorganic constituents, suspended sediment, bacteria, and phytoplankton in streams, and chlorinated hydrocarbons in bed materials in the Middle Fork Anderson River watershed; identifies areas and sources of water-quality problems; and determines the effects of existing flood-retarding structures on water quality. The data base for this water-quality assessment included five sets of samples collected from September 1975 through July 1976. Temperature, specific conductance, pH, and dissolved-oxygen concentration of water were measured, and stream discharge was estimated at 25 sites. Samples for laboratory analysis were collected at 9 of these sites in September 1975, at 8 of the sites in December 1975, and at 7 of the sites in March, June, and July 1976. Surface-water quality in the watershed is generally good except for problem-causing concentrations of bacteria, dissolved oxygen, and phosphorus at some sites along the main stem during low flow, and manganese at most sites year-round. (Woodard-USGS)

Ayers, M. A.

1978-01-01

418

Quantum Group Symmetries of the Anderson Model of a Magnetic Impurity  

NASA Astrophysics Data System (ADS)

The Anderson model of a magnetic impurity is integrable if the local density of states at the impurity site is Lorentzian (width ?). Bethe Ansatz (BA) methods have failed to extract local dynamical properties. The integrable model has huge Yangian ``quantum group symmetries'' not apparent in the BA. Explicitly, the first-quantized expression for the Yangian spin generator that commutes with the Hamiltonian is sumi ?i S_i: ?i = (hi - Ed -U/2)^2 + U sumj ne i ( n_din_dj,h_i - 1/2i? ?_ij?_ij ). Here i labels the electrons, Si is their spin, hi is the one-body kinetic energy and s-d hybridisation, n_di is the projection onto the impurity orbital, and ?_ij = ± 1 or 0 measures the relative order of the particles, d-electrons are at the origin, ?_ij is the exchange operator. When transcribed into second-quantized formalism, a second Yangian ``pseudospin'' generator that completes the full SO(4) symmetry is found. The ground state of the symmetric model is the unique state annihilated by both Yangian generators.

Haldane, F. D. M.

2002-03-01

419

Quantum-Mechanical Variant of the Thouless-Anderson-Palmer Equation for Error-Correcting Codes  

NASA Astrophysics Data System (ADS)

Statistical mechanics of information has been applied to problems in various research topics of information science and technology [1],[2]. Among those research topics, error-correcting code is one of the most developed subjects. In the research field of error-correcting codes, Nicolas Sourlas showed that the so-called convolutional codes can be constructed by spin glass with infinite range p-body interactions and the decoded message should be corresponded to the ground state of the Hamiltonian [3]. Ruján pointed out that the bit error can be suppressed if one uses finite temperature equilibrium states as the decoding result, instead of the ground state [4], and the so-called Bayes-optimal decoding at some specific condition was proved by Nishimori [5] and Nishimori and Wong [6]. Kabashima and Saad succeeded in constructing more practical codes, namely low-density parity check (LDPC) codes by using the infinite range spin glass model with finite connectivities [7]. They used the so-called TAP (Thouless-Anderson-Palmer) equations to decode the original message for a given parity check.

Inoue, J.; Saika, Y.; Okada, M.

420

Numerical evidence against both mean field and droplet scenarios of the Edwards-Anderson model  

NASA Astrophysics Data System (ADS)

From tempered Monte Carlo simulations, we have obtained accurate probability distributions p(q) of the spin-overlap parameter q for finite Edwards-Anderson (EA) and Sherrington-Kirkpatrick (SK) spin-glass systems at low temperatures. Our results for p(q) follow from averages over 10^5 disordered samples of linear sizes L=4-8 and over 15 ; 000 samples for L=10. In both the SK and EA models, at temperatures as low as 0.2Tsg, where Tsg is the transition temperature, p(q) varies insignificantly with L. This does not fit the trend that the droplet model predicts for large L. We have also calculated correlation functions, F(q1,q2), from which rms deviations, ?p, over different realizations of quenched disorder, as well as thermal fluctuations, w, of q values, follow. Our numerical results for ?p and w scale as ?L and 1/L, respectively, in the SK model. This fits in well with mean field predictions. On the other hand, our data for w and ?p vary little, if at all, for the EA model.

Fernandez, Julio F.; Alonso, Juan J.

2013-03-01

421

Validation of the M. D. Anderson Symptom Inventory multiple myeloma module  

PubMed Central

Background The symptom burden associated with multiple myeloma (MM) is often severe. Presently, no instrument comprehensively assesses disease-related and treatment-related symptoms in patients with MM. We sought to validate a module of the M. D. Anderson Symptom Inventory (MDASI) developed specifically for patients with MM (MDASI-MM). Methods The MDASI-MM was developed with clinician input, cognitive debriefing, and literature review, and administered to 132 patients undergoing induction chemotherapy or stem cell transplantation. We demonstrated the MDASI-MM’s reliability (Cronbach ? values); criterion validity (item and subscale correlations between the MDASI-MM and the European Organization for Research and Treatment of Cancer Quality of Life Questionnaire (EORTC QLQ-C30) and the EORTC MM module (QLQ-MY20)), and construct validity (differences between groups by performance status). Ratings from transplant patients were examined to demonstrate the MDASI-MM’s sensitivity in detecting the acute worsening of symptoms post-transplantation. Results The MDASI-MM demonstrated excellent correlations with subscales of the 2 EORTC instruments, strong ability to distinguish clinically different patient groups, high sensitivity in detecting change in patients’ performance status, and high reliability. Cognitive debriefing confirmed that the MDASI-MM encompasses the breadth of symptoms relevant to patients with MM. Conclusion The MDASI-MM is a valid, reliable, comprehensive-yet-concise tool that is recommended as a uniform symptom assessment instrument for patients with MM.

2013-01-01

422

Agalsidase alfa (Replagal™) in the treatment of Anderson-Fabry disease  

PubMed Central

Anderson-Fabry disease (AFD) is an X-linked storage disorder caused by a deficiency of the lysosomal hydrolase a-galactosidase A (AGAL) and the resultant accumulation of its glycosphingolipid substrate (Gb3) in several tissue types. Major morbidity and reduced life expectancy among affected individuals are a consequence of renal, cardiac and cerebrovascular involvement. Symptomatic males and females with AFD have been described, although the onset of clinical manifestations may be delayed and more variable among the latter patient group, partly attributed to lyonization. Agalsidase alfa (Replagal™) is a recombinant formulation of human AGAL which has been demonstrated to modify the course of AFD in treated patients. Factors that may influence clinical outcomes include disease stage at the point of treatment initiation and antibody formation. There is incomplete understanding of AFD pathophysiology. Early diagnosis and timely intervention may be essential. The use of adjunctive therapies, directed at risk reduction (eg, aspirin for stroke prophylaxis), require careful scrutiny, but such agents are likely to be vital components of a comprehensive approach to patient care. Long-term studies may clarify the optimal dose and frequency of enzyme administration. Meanwhile, budding strategies such as chaperone-mediated enzyme enhancement may offer the potential for an alternative or multimodality approach to the management of AFD.

Pastores, Gregory M

2007-01-01

423

Full density-matrix numerical renormalization group calculation of impurity susceptibility and specific heat of the Anderson impurity model  

NASA Astrophysics Data System (ADS)

Recent developments in the numerical renormalization group (NRG) allow the construction of the full density matrix (FDM) of quantum impurity models [see A. Weichselbaum and J. von Delft, Phys. Rev. Lett.PRLTAO0031-900710.1103/PhysRevLett.99.076402 99, 076402 (2007)] by using the completeness of the eliminated states introduced by F. B. Anders and A. Schiller [F. B. Anders and A. Schiller, Phys. Rev. Lett.PRLTAO0031-900710.1103/PhysRevLett.95.196801 95, 196801 (2005)]. While these developments prove particularly useful in the calculation of transient response and finite-temperature Green's functions of quantum impurity models, they may also be used to calculate thermodynamic properties. In this paper, we assess the FDM approach to thermodynamic properties by applying it to the Anderson impurity model. We compare the results for the susceptibility and specific heat to both the conventional approach within NRG and to exact Bethe ansatz results. We also point out a subtlety in the calculation of the susceptibility (in a uniform field) within the FDM approach. Finally, we show numerically that for the Anderson model, the susceptibilities in response to a local and a uniform magnetic field coincide in the wide-band limit, in accordance with the Clogston-Anderson compensation theorem.

Merker, L.; Weichselbaum, A.; Costi, T. A.

2012-08-01

424

Defective Glycosylation of Erythrocyte Membrane Glycoconjugates in a Variant of Congenital Dyserythropoietic Anemia Type II: Association of Low Level of Membrane-Bound Form of Galactosyltransferase  

Microsoft Academic Search

Congenital dyserythropoietic anemia type II (CDA II) or HEMPAS is a genetic disease caused by plasma membrane abnormality. The enzymic defect of HEMPAS has been suggested to be the lowered activity of N-acetylglucosami- nyltransferase II. resulting in lack of polylactosamine for- mation on proteins and leading to accumulation of polylac- tosaminyl lipids. In contrast to typical HEMPAS cases, cell-surface labeling

Michiko N. Fukuda; Khaled A. Masri; Anne Dell; Eugene J.-M. Thonar; George Klier; Ray M. Lowenthal

1989-01-01

425

Transient cerebral ischemia decreases calcium/calmodulin-dependent protein kinase II immunoreactivity, but not mRNA levels in the gerbil hippocampus.  

PubMed

During transient cerebral ischemia, intracellular calcium increases initiating a cascade of events which leads to the delayed death of neurons located in the hippocampus. Coupled to this calcium disturbance is the rapid decrease of calcium/calmodulin kinase II (CaM kinase) activity, a protein kinase critical to neuronal functioning. The present study correlated the increased locomotor activity following ischemic insult with alterations in CaM kinase mRNA levels and immunocytochemical labeling of alpha and beta CaM kinase subunits in the hippocampus. The protective effect of hypothermia was also compared with CaM kinase mRNA levels and immunoreactivity. Levels of CaM kinase message for either alpha or beta subunits was not altered in ischemic gerbils compared to sham or hypothermic ischemic conditions. Immunoreactivity for both the alpha and beta subunits was markedly reduced in the vulnerable CA1 region of ischemic animals compared to sham controls. Gerbils that underwent the ischemic insult while hypothermic showed no decrement in staining. CaM kinase-like immunoreactivity in the ischemia-resistant CA3 sector was not altered following ischemia. These data suggest that the loss of hippocampal CaM kinase immunoreactivity observed at 24 h following ischemia is not associated with a reduction in CaM kinase mRNA levels and support the notion that the rapid decline in CaM kinase activity following ischemic insult is a result of a posttranslational modification and/or translocation of the enzyme. PMID:8821762

Babcock, A M; Liu, H; Paden, C M; Edmo, D; Popper, P; Micevych, P E

1995-12-24

426

A report documenting the completion of the Los Alamos National Laboratory portion of the ASC level II milestone ""Visualization on the supercomputing platform  

SciTech Connect

This report provides documentation for the completion of the Los Alamos portion of the ASC Level II 'Visualization on the Supercomputing Platform' milestone. This ASC Level II milestone is a joint milestone between Sandia National Laboratory and Los Alamos National Laboratory. The milestone text is shown in Figure 1 with the Los Alamos portions highlighted in boldfaced text. Visualization and analysis of petascale data is limited by several factors which must be addressed as ACES delivers the Cielo platform. Two primary difficulties are: (1) Performance of interactive rendering, which is the most computationally intensive portion of the visualization process. For terascale platforms, commodity clusters with graphics processors (GPUs) have been used for interactive rendering. For petascale platforms, visualization and rendering may be able to run efficiently on the supercomputer platform itself. (2) I/O bandwidth, which limits how much information can be written to disk. If we simply analyze the sparse information that is saved to disk we miss the opportunity to analyze the rich information produced every timestep by the simulation. For the first issue, we are pursuing in-situ analysis, in which simulations are coupled directly with analysis libraries at runtime. This milestone will evaluate the visualization and rendering performance of current and next generation supercomputers in contrast to GPU-based visualization clusters, and evaluate the perfromance of common analysis libraries coupled with the simulation that analyze and write data to disk during a running simulation. This milestone will explore, evaluate and advance the maturity level of these technologies and their applicability to problems of interest to the ASC program. In conclusion, we improved CPU-based rendering performance by a a factor of 2-10 times on our tests. In addition, we evaluated CPU and CPU-based rendering performance. We encourage production visualization experts to consider using CPU-based rendering solutions when it is appropriate. For example, on remote supercomputers CPU-based rendering can offer a means of viewing data without having to offload the data or geometry onto a CPU-based visualization system. In terms of comparative performance of the CPU and CPU we believe that further optimizations of the performance of both CPU or CPU-based rendering are possible. The simulation community is currently confronting this reality as they work to port their simulations to different hardware architectures. What is interesting about CPU rendering of massive datasets is that for part two decades CPU performance has significantly outperformed CPU-based systems. Based on our advancements, evaluations and explorations we believe that CPU-based rendering has returned as one viable option for the visualization of massive datasets.

Ahrens, James P [Los Alamos National Laboratory; Patchett, John M [Los Alamos National Laboratory; Lo, Li - Ta [Los Alamos National Laboratory; Mitchell, Christopher [Los Alamos National Laboratory; Mr Marle, David [KITWARE INC.; Brownlee, Carson [UNIV OF UTAH

2011-01-24

427

On Planetary Evolution and the Evolution of Planetary Science During the Career of Don Anderson  

NASA Astrophysics Data System (ADS)

The planets of our solar system have long been viewed by Don Anderson as laboratories for testing general aspects of planetary evolution and as points of comparison to the Earth. I was fortunate to have been a student 39 years ago in a course at Caltech that Don taught with Bob Kovach on the interiors of the Earth and the planets. At that time, Mariner 4 had not yet flown by Mars, the lunar Ranger program was still in progress, and it was permissible to entertain the hypothesis that all of the terrestrial planets were identical in bulk composition. In the last four decades spacecraft have visited every planet from Mercury to Neptune; samples from the Moon, Mars, asteroids, and comets reside in our laboratories; and more than 100 planets have been discovered orbiting other stars. More importantly, traditionally distinct fields have merged to the point where planetary scientists must be conversant with the findings and modes of thinking from astronomy and biology as well as the geosciences. A few examples illustrate this confluence. Theoretical models for the structure of the atmospheres of gas-giant planets led to the first astronomical detection of an extrasolar planetary atmosphere for the transiting planet HD209458b. Although the atmospheric models were based on those for solar-system gas giants, the 3.5-day orbital period means that this planet is 100 times closer to its star than Jupiter is to the Sun, its effective temperature is 1100 K, and the detected signature of the planetary atmosphere was absorption by neutral sodium. Sodium in Mercury's exosphere, detected astronomically from Earth, figures into the question of how the terrestrial planets came to have distinct bulk compositions. Hypotheses to account for Mercury's high uncompressed density, and by inference its high ratio of metal to silicate, range from chemical gradients in the early solar nebula to preferential removal of silicates from a differentiated protoplanet by nebular heating or giant impact disruption, processes that would have affected the final composition of the other inner planets to lesser degrees. These hypotheses will be distinguishable by future remote sensing measurements from a spacecraft in Mercury orbit, but all lead to the prediction that volatile species such as sodium should be deficient in Mercury's silicate fraction. The most recent models for Mercury's exosphere are consistent with the idea that the required fresh supply of sodium from Mercury's surface is no greater than that predicted for meteorite infall. One of the leading questions driving the current exploration of Mars is whether the surface or subsurface was ever conducive to the origin and evolution of life. Sites of hydrothermal circulation within the crust may have provided the necessary energy and chemical building blocks. Remote sensing of candidate hydrothermal minerals at the Martian surface is the leading technique being used to seek such sites, but paleomagnetism may offer another route. Several hypotheses link hydrothermal activity to either the formation of magnetic carriers during the lifetime of the Martian dynamo or the alteration of such carriers after the dynamo ceased, leading to the possibility that high-resolution mapping of crustal magnetism may provide a prospecting tool for promising Martian biological habitats. As Don Anderson showed us by example throughout his career, students of the Earth need not confine their attention to a single planet or even a single planetary system. The lessons from diverse fields that planetary scientists must master to stay current will keep all of us --- like Don --- young and curious.

Solomon, S. C.

2003-12-01

428

The pioneer woman's view of migraine: Elizabeth Garrett Anderson's thesis "Sur la migraine".  

PubMed

This is a presentation of a doctoral thesis of 1870. The author was English but the thesis and the examinations were in French. Elizabeth Garrett Anderson, usually referred to as E.G.A., was the first woman in Britain to obtain the title of M.D., but not the first in Europe. Nadeshda Prokofevna Suslova, a Russian, received her M.D. in 1867 in Zurich, the most liberal university at that time, soon to be flooded by female students from Russia. E.G.A. had been applying to the few possible European universities but she settled for Paris after the Empress Eugenie had decided that she should be accepted there. This meant that she could succeed without having to be a Paris resident, just by writing a thesis and passing a series of examinations presided over by Paul Broca. This was important as she was already conducting private and dispensary practice, and could not find a locum (she insisted on a woman). E.G.A. had suffered many setbacks, for being a woman, as such being unacceptable in dissection rooms and operating theatres, and generally in a professional career where women were unheard of. She was finally permitted to receive her medical diploma from the Worshipful Society of Apothecaries of London. She wrote about her thesis: "I have chosen Headache as its subject. I had to find a subject which could be well studied without post-mortem observations, of which I can have but very few in either private or dispensary practice; and I wished also to take a large subject, one that demanded some insight into the harmony that exists between the main physiological functions." Marcia Wilkinson (M.W.), who worked in the Elizabeth Garrett Anderson Hospital in London for 35 years, heard there of E.G.A.'s thesis on migraine and sent for it from Paris. In 1966 she translated it into English from the original French, being interested both in the subject and in the person of this resolute and lucid woman. When H. Isler found the French thesis in the British Library he intended to translate it but, after discussion, we decided on a joint effort (95% of the translation is by M.W.; very few details were changed, and some footnotes added for better understanding). We think that E.G.A.'s text is a classic, showing profound understanding, sound practical advice, and also, in its theoretical part, the limits of neurophysiological knowledge in Paris when Brown-Sequard was "charge des cours" there. We may add that in her various examinations she had to answer questions, in French, on the use of footprints by the police, the general nature of fishes, toxic fishes, electric fishes, cod liver oil, and the secretion of tears. She earned much applause from the public, which consisted of male French students, and the overt appreciation of Paul Broca, head examiner, and Dr Wurtz, the Dean of the Faculte de Médecine. The impact of her thesis in the 19th century was modest. It appears to be rather marginal in the German literature of the early 20th century, but it has imprinted the management of migraine at the City of London Migraine Clinic in the last thirty years. The importance of nutrition, regular meals, regular habits, the need to supplement analgesics with antiemetics, and the treatment of the attack with rest, and great quantities of hot tea, were certainly related to E.G.A.'s doctrine. The internationally prevailing recommendation to give antiemetics, and then only analgesics, as well as the combination of both in one tablet, may thus be traced back to E.G.A. via the teachings of M.W. and Nat Blau. PMID:10099853

Wilkinson, M; Isler, H

1999-01-01

429

Organic-inorganic hybrids constructed by Anderson-type polyoxoanions and copper coordination complexes  

SciTech Connect

Four organic-inorganic hybrid compounds based on Anderson-type polyoxoanions, namely, {l_brace}[Cu(2,2'-bpy)(H{sub 2}O){sub 3}]{sub 2}[Cr(OH){sub 6}Mo{sub 6}O{sub 18}]{r_brace}{l_brace}[Cu(2,2'-bpy)(H{sub 2}O)Cl][Cu(2,2'-bpy) (H{sub 2}O)(NO{sub 3})][Cr(OH){sub 6}Mo{sub 6}O{sub 18}]{r_brace}.18H{sub 2}O (1), [Cu(2,2'-bpy)(H{sub 2}O){sub 2}Cl]{l_brace}[Cu(2,2'-bpy)(H{sub 2}O){sub 2}][Cr(OH){sub 6}Mo{sub 6}O{sub 18}]{r_brace}.4H{sub 2}O (2), (H{sub 3}O){l_brace}[Cu(2,2'-bpy)(H{sub 2}O){sub 2}]{sub 2}[Cu(2,2'-bpy)(H{sub 2}O)]{sub 2}{r_brace}[Cr(OH){sub 6}Mo{sub 6}O{sub 18}]{sub 3}.36H{sub 2}O (3), and (H{sub 3}O){l_brace}[Cu(2,2'-bpy)(H{sub 2}O){sub 2}]{sub 2}[Cu(2,2'-bpy)(H{sub 2}O)]{sub 2}{r_brace}[Al(OH){sub 6}Mo{sub 6}O{sub 18}]{sub 3}.33H{sub 2}O (4), were isolated by conventional solution method, and crystal structures have been determined by single-crystal X-ray diffraction. Among them, compound 1 displays a discrete supramolecular structure, compound 2 shows a chainlike structure with chloro-copper complexes as counteranions, and compounds 3 and 4 are isomorphic and exhibit unique 3D open frameworks with lattice water molecules residing in the channels. The compounds 3 and 4 represent the first example of 3D organic-inorganic hybrid compounds in the TMs/2,2'-bpy/POMs system. Investigation of the reaction conditions reveals that the geometry and size of the anions together with its coordinating abilities to the metal centers have a decisive influence on both the composition and the dimensionality of the final compounds. - Graphical Abstract: Four organic-inorganic hybrids based on Anderson-type polyoxoanions have been synthesized. Compound 1 displays a discrete structure, 2 shows a chainlike structure, 3 and 4 are isomorphic and exhibit unique 3D open frameworks with lattice waters residing in the channels. The different structures suggest that the overall structures of the compounds are influenced by the nature of the acidic anions.

Cao Ruige [Key Laboratory of Polyoxometalates Science of the Ministry of Education, College of Chemistry, Northeast Normal University, Changchun City, JiLin 130024 (China); Liu Shuxia [Key Laboratory of Polyoxometalates Science of the Ministry of Education, College of Chemistry, Northeast Normal University, Changchun City, JiLin 130024 (China)], E-mail: liusx@nenu.edu.cn; Liu Ying; Tang Qun; Wang Liang; Xie Linhua; Su Zhongmin [Key Laboratory of Polyoxometalates Science of the Ministry of Education, College of Chemistry, Northeast Normal University, Changchun City, JiLin 130024 (China)

2009-01-15

430

Organic-inorganic hybrids constructed by Anderson-type polyoxoanions and copper coordination complexes  

NASA Astrophysics Data System (ADS)

Four organic-inorganic hybrid compounds based on Anderson-type polyoxoanions, namely, {[Cu(2,2?-bpy)(H2O)3]2[Cr(OH)6Mo6O18]}{[Cu(2,2?-bpy)(H2O)Cl][Cu(2,2?-bpy)(H2O)(NO3)][Cr(OH)6Mo6O18]}·18H2O (1), [Cu(2,2?-bpy)(H2O)2Cl]{[Cu(2,2?-bpy)(H2O)2][Cr(OH)6Mo6O18]}·4H2O (2), (H3O){[Cu(2,2?-bpy)(H2O)2]2[Cu(2,2?-bpy)(H2O)]2}[Cr(OH)6Mo6O18]3·36H2O (3), and (H3O){[Cu(2,2?-bpy)(H2O)2]2[Cu(2,2?-bpy)(H2O)]2}[Al(OH)6Mo6O18]3·33H2O (4), were isolated by conventional solution method, and crystal structures have been determined by single-crystal X-ray diffraction. Among them, compound 1 displays a discrete supramolecular structure, compound 2 shows a chainlike structure with chloro-copper complexes as counteranions, and compounds 3 and 4 are isomorphic and exhibit unique 3D open frameworks with lattice water molecules residing in the channels. The compounds 3 and 4 represent the first example of 3D organic-inorganic hybrid compounds in the TMs/2,2?-bpy/POMs system. Investigation of the reaction conditions reveals that the geometry and size of the anions together with its coordinating abilities to the metal centers have a decisive influence on both the composition and the dimensionality of the final compounds.

Cao, Rui-Ge; Liu, Shu-Xia; Liu, Ying; Tang, Qun; Wang, Liang; Xie, Lin-Hua; Su, Zhong-Min

2009-01-01

431

The University of Texas M.D. Anderson Cancer Center Proton Therapy Facility  

NASA Astrophysics Data System (ADS)

The University of Texas M.D. Anderson Cancer Center (MDACC), in partnership with Sanders Morris Harris Inc., a Texas-based investment banking firm, and The Styles Company, a developer and manager of hospitals and healthcare facilities, is building a proton therapy facility near the MDACC main complex at the Texas Medical Center in Houston, Texas USA. The MDACC Proton Therapy Center will be a freestanding, investor-owned radiation oncology center offering state-of-the-art proton beam therapy. The facility will have four treatment rooms: three rooms will have rotating, isocentric gantries and the fourth treatment room will have capabilities for both large and small field (e.g. ocular melanoma) treatments using horizontal beam lines. There will be an additional horizontal beam room dedicated to physics research and development, radiation biology research, and outside users who wish to conduct experiments using proton beams. The first two gantries will each be initially equipped with a passive scattering nozzle while the third gantry will have a magnetically swept pencil beam scanning nozzle. The latter will include enhancements to the treatment control system that will allow for the delivery of proton intensity modulation treatments. The proton accelerator will be a 250 MeV zero-gradient synchrotron with a slow extraction system. The facility is expected to open for patient treatments in the autumn of 2005. It is anticipated that 675 patients will be treated during the first full year of operation, while full capacity, reached in the fifth year of operation, will be approximately 3,400 patients per year. Treatments will be given up to 2-shifts per day and 6 days per week.

Smith, Alfred; Newhauser, Wayne; Latinkic, Mitchell; Hay, Amy; McMaken, Bruce; Styles, John; Cox, James

2003-08-01

432

Cushing's syndrome secondary to ectopic ACTH secretion: The University of Texas MD Anderson Cancer Center Experience  

PubMed Central

Background Cushing's syndrome (CS) secondary to ectopic ACTH secretion (EAS) has been described in association with a variety of tumors. The current experience with this syndrome is based on a few case series and individual case reports. Limited data are available about the tumors associated with CS-EAS in cancer center setting. This report describes CS-EAS at MD Anderson Cancer Center to further enhance our understanding and management of this syndrome. Methods This is a retrospective review for 43 patients with CS-EAS who were diagnosed between 1979 and 2009 at our institution. Results Different neuroendocrine tumors were associated with CS-EAS. Twenty one patients (48.9%) had tumors located in the chest cavity with bronchial carcinoid and small cell lung cancer representing the two most common causes. The ACTH source remained occult in 4 patients (9.3 %) despite extensive work-up. Clinical presentation was variable and the classical features of CS were not evident in some patients. Death occurred in 27 patients (62.8%) and the median overall survival was 32.2 months. Major morbidities included new onset or worsening hyperglycemia (77%), symptomatic venous thromboembolism (14%) and infections (23%). Conclusions In CS-EAS cases seen at a comprehensive cancer center, tumors originating in the chest cavity were the leading tumors associated with this syndrome. We suspect that CS-EAS is underreported because of the atypical presentation in some cases. Thus, we suggest careful evaluation of patients with neuroendocrine tumors to avoid missing co-existing CS-EAS.

Ejaz, Shamim; Vassilopoulou-Sellin, Rena; Busaidy, Naifa L.; Hu, Mimi I.; Waguespack, Steven G.; Jimenez, Camilo; Ying, Anita K.; Cabanillas, Maria; Abbara, Maher; Habra, Mouhammed Amir

2011-01-01

433

Chronic renal failure, dialysis, and renal transplantation in Anderson-Fabry disease.  

PubMed

Anderson-Fabry disease (AFd) is a rare, inherited, x-linked disease characterized by the deficiency of the lysosomal enzymatic alpha-galactosidase A activity (alpha-Gal-A). The enzyme defect leads to progressive accumulation of glycosphingolipids (GL) in all kinds of cells, tissues, organs, and body fluids. The clinical manifestations are very protean, the residual activity of alpha-Gal-A and/or different gene mutations might explain different phenotypes, but as yet these concepts have not been proven. Usually, patients with AFd show 3 clinical phases, more evident in men than in heterozygous women. The first phase (childhood and adolescence) is characterized by myalgia, arthralgia, acroparesthesia, fever, cutaneous angiokeratomas, and corneal opacities. The second phase is characterized mainly by renal involvement. In the third phase, severe renal impairment and involvement of cerebrovascular and cardiovascular systems are present. The progression to end-stage renal disease (ESRD) is common in hemizygous males (3rd-5th decade of life); usually, death occurs because of cerebral and/or cardiovascular complications in patients undergoing chronic dialysis therapies. The survival of patients with AFd in dialysis is better than in diabetic patients, but it clearly is decreased compared with uremic patients with other nephropathies, despite a lower mean age of uremia (50 versus 60 y). The outcome of kidney transplantation is similar to that found in other patients with ESRD, despite controversial issues published in the past. The use of a kidney donor with normal alpha-Gal-A activity in the control of the metabolic systemic disease is unproven. The recurrence of GL deposits in the kidney graft has been documented rarely. The definitive treatment for AFd is enzyme replacement therapy with purified alpha-Gal-A produced by a genetically engineered human cell line or Chinese hamster oocytes: relatively short-term studies have shown a significant treatment effect on clinical outcome measures. PMID:15490423

Sessa, Adalberto; Meroni, Mietta; Battini, Graziana; Righetti, Marco; Mignani, Renzo

2004-09-01

434

Anderson-Stuart Model to Analyze DC Conductivity of Fluormica Glassceramics  

NASA Astrophysics Data System (ADS)

The Glassceramics (GC) are essentially polycrystalline solids in the matrix of residual glass phase. They are interesting in view of the scientific and technological importance. The fluormica glass system (K2O MgO Al2O3 MgF2 B2O3 SiO2) was prepared for a specific composition by melt quench technique, and the fluormica GC phase was obtained by giving heat treatment at 1123 K to the glass sample [1]. The transition from glass to GC was confirmed using XRD. The fluormica are structural analogues of natural mica. Here the K+ ions are weakly cross-bonded in tetrahedral sheet. Fluormica exhibits an unusual combination of properties like machinability, resistance to withstand high temperatures, high dielectric constant with low loss, and high DC resistivity [2]. We have measured the DC conductivity (s) as a function of temperature (T) using the two-probe method. These measurements have been analyzed using the Anderson-Stuart (AS) model [3]. The Arrhenius plots of s vs T exhibit two linear regions, and the activation energy of the GC is found to be larger than that of glass [1]. The physical parameters selected to fit s vs T using the AS model which describes fairly well the ionic conduction in the fluormica glass system, are found to be reasonable. However, it appeared that a distribution of activation energies instead of single activation energy is necessary, to explain the experimental data. Dr Mahntappa S Jogad would like to acknowledge the American Physical Society’s Kilambi Ramavataram Committee and the Fulbright Foreign Scholarship Board, for a visiting fellowship. References: 1. M S Jogad, B S Krishnamurthy and V Saraswati, Asian Journal of Physics, 6, Nos, 142, 158 (1997) 2. Mahantappa S Jogad, B S Krishnamurthy and V Saraswati, J Non Crystalline Solids (Communicated). 3. M. D. Ingram, Phys. Chem. Glasses, 28, 215 (1987).

Jogad, Mahantappa S.; Krishnamurthy, B. S.; Saraswati, V.

2001-03-01

435

DFT treatment of transport through Anderson junction: exact results and approximations  

NASA Astrophysics Data System (ADS)

Since the pioneering break-junction experiments of Reed and Tour measuring the conductance of dithiolated benzene between gold leads, many researchers in physics and chemistry have been calculating conductance for such systems using density functional theory (DFT). Off resonance, the predicted current is often 10-100 times larger than that measured. This error is often ascribed to the application of ground-state DFT to a non-equilibrium problem. I will argue that, in fact, this is largely due to errors in the density functional approximations in popular use, rather than necessarily errors in the methodology. A stark illustration of this principle is the ability of DFT to reproduce the exact transmission through an Anderson junction at zero-temperature and weak bias, including the Kondo plateau, but only if the exact ground-state density functional is used. In fact, this case can be used to reverse-engineer the exact functional for this problem. Popular approximations can also be tested, including both smooth and discontinuous functionals of the density, as well as symmetry-broken approaches. [4pt] [1] Kondo effect given exactly by density functional theory, J. P. Bergfield, Z. Liu, K. Burke, and C. A. Stafford, arXiv:1106.3104; [0pt] [2] Broadening of the Derivative Discontinuity in Density Functional Theory, F. Evers, and P. Schmitteckert, arXiv:1106.3658; [0pt] [3] DFT-based transport calculations, Friedel's sum rule and the Kondo effect, P. Tr"oster, P. Schmitteckert, and F. Evers, arXiv:1106.3669; [0pt] [4] Towards a description of the Kondo effect using time-dependent density functional theory, G. Stefanucci, and S. Kurth, arXiv:1106.3728.

Burke, Kieron

2012-02-01

436

Simultaneous trace-levels determination of Hg(II) and Pb(II) ions in various samples using a modified carbon paste electrode based on multi-walled carbon nanotubes and a new synthesized Schiff base.  

PubMed

A modified carbon paste electrode based on multi-walled carbon nanotubes (MWCNTs) and 3-(4-methoxybenzylideneamino)-2-thioxothiazolodin-4-one as a new synthesized Schiff base was constructed for the simultaneous determination of trace amounts of Hg(II) and Pb(II) by square wave anodic stripping voltammetry. The modified electrode showed an excellent selectivity and stability for Hg(II) and Pb(II) determinations and for accelerated electron transfer between the electrode and the analytes. The electrochemical properties and applications of the modified electrode were studied. Operational parameters such as pH, deposition potential and deposition time were optimized for the purpose of determination of traces of metal ions at pH 3.0. Under optimal conditions the limits of detection, based on three times the background noise, were 9.0×10(-4) and 6.0×10(-4) ?mol L(-1) for Hg(II) and Pb(II) with a 90 s preconcentration, respectively. In addition, the modified electrode displayed a good reproducibility and selectivity, making it suitable for the simultaneous determination of Hg(II) and Pb(II) in real samples such as sea water, waste water, tobacco, marine and human teeth samples. PMID:22975186

Afkhami, Abbas; Bagheri, Hasan; Khoshsafar, Hosein; Saber-Tehrani, Mohammad; Tabatabaee, Masoumeh; Shirzadmehr, Ali

2012-08-23

437

Variable induction of vitellogenin genes in the varroa mite, Varroa destructor (Anderson & Trueman), by the honeybee, Apis mellifera L, host and its environment.  

PubMed

Transcript levels of vitellogenins (Vgs) in the varroa mite, Varroa destructor (Anderson & Trueman), were variably induced by interactions between the developing honeybee, Apis mellifera L, as a food source and the capped honeybee cell environment. Transcripts for two Vgs of varroa mites were sequenced and putative Vg protein products characterized. Sequence analysis of VdVg1 and VdVg2 proteins showed that each had greater similarity with Vg1 and Vg2 proteins from ticks, respectively, than between themselves and were grouped separately by phylogenetic analyses. This suggests there was a duplication of the ancestral acarine Vg gene prior to the divergence of the mites and ticks. Low levels of transcript were detected in immature mites, males and phoretic females. Following cell invasion by phoretic females, VdVg1 and VdVg2 transcript levels were up-regulated after cell capping to a maximum at the time of partial cocoon formation by the honeybee. During oviposition the two transcripts were differentially expressed with higher levels of VdVg2 being observed. A bioassay based on assessing the transcript levels was established. Increases in VdVg1 and VdVg2 transcripts were induced experimentally in phoretic females when they were placed inside a cell containing an early metamorphosing last instar bee but not when exposed to the metamorphosing bee alone. The variable response of Vg expression to the food source as well as environmental cues within the capped cell demonstrates that perturbation of host-parasite interactions may provide avenues to disrupt the reproductive cycle of the varroa mites and prevent varroasis. PMID:23331492

Cabrera Cordon, A R; Shirk, P D; Duehl, A J; Evans, J D; Teal, P E A

2013-02-01

438

Farnesoid X-Activated Receptor Induces Apolipoprotein C-II Transcription: a Molecular Mechanism Linking Plasma Triglyceride Levels to Bile Acids  

Microsoft Academic Search

The farnesoid X-activated receptor (FXR; NR1H4), a member of the nuclear hormone receptor super- family, induces gene expression in response to several bile acids, including chenodeoxycholic acid. Here we used suppression subtractive hy- bridization to identify apolipoprotein C-II (apoC-II) as an FXR target gene. Retroviral expression of FXR in HepG2 cells results in induction of the mRNA encoding apoC-II in

HEIDI RACHELLE KAST; CATHERINE M. NGUYEN; CHRISTOPHER J. SINAL; STACEY A. JONES; BRYAN A. LAFFITTE; KAREN REUE; FRANK J. GONZALEZ; TIMOTHY M. WILLSON; PETER A. EDWARDS

2001-01-01

439

Changes in the patterns, presentation and management of penetrating chest trauma patients at a level II trauma centre in southern Pakistan over the last two decades.  

PubMed

Penetrating chest trauma can be used as an indicator of violence in the country. We aimed to look at the changes in its incidence and management at a major trauma centre in the country. We also wanted to look at any effect of prehospital time on surgical intervention and outcome of the victim. In this retrospective descriptive study, we observed the presentation and management of 191 penetrating chest injury patients at a level II trauma hospital in Pakistan in the last 20 years. The study sample was divided into two groups: Group 1, 1988-1998 and Group 2, 1999-2009. No significant change in incidence of trauma was observed between the two groups. The delay in the time between event and arrival showed an increase in the number of surgical procedures performed. Also the number of thoracotomies performed went up significantly in the second decade from 5.7 to 16.5% with a P<0.05. Six (3.1%) mortality cases were observed in 20 years. It was seen that the greater the prehospital time, the greater the chances of surgery. Also seen was the increase in mortality as critical cases could make it to the hospital alive in recent times due to improved transportation services. PMID:20923826

Tariq, Umer Muhammad; Faruque, Ahmad; Ansari, Hamza; Ahmad, Mansoor; Rashid, Umar; Perveen, Shazia; Sharif, Hasanat

2010-10-05

440

Systematic Source Term Analyses for Level 3 PSA of a BWR With Mark-II Type Containment With THALES-2 Code  

SciTech Connect

The THALES-2 code is an integrated severe accident analysis code developed at the Japan Atomic Energy Research Institute in order to simulate the accident progression and transport of radioactive material for probabilistic safety assessment (PSA) of a nuclear power plant. As part of a level 3 PSA being performed at JAERI for a 1,100 MWe BWR-5 with a Mark-II containment, a series of calculations were performed by THALES-2 to evaluate the source terms for extensive accident scenarios. For some of the containment failure modes not modeled in THALES-2, such as steam explosion, simple models were coupled with the analysis results of THALES-2 to estimate the source terms. This paper presents the methods and insights from the analyses. An insight from the analyses was that the source terms depend more strongly on the differences in the containment function failure scenarios, such as overpressure failure, controlled containment venting, and small leakage to the reactor building, than those core damage sequences. (authors)

Jun Ishikawa; Ken Muramatsu [Japan Atomic Energy Research Institute (Japan); Toru Sakamoto [Toshiba IT-Solutions Corporation (Japan)

2002-07-01

441

Low levels of Na, K-ATPase and carbonic anhydrase II during choroid plexus development suggest limited involvement in early CSF secretion  

PubMed Central

In the adult, cerebrospinal fluid (CSF) is produced by the actions of numerous transporters and enzymes creating ion gradients that drive the entry of water into the ventricles via the aquaporin-1 water channels (AQP1). It is not known when in development CSF secretion starts but, in the rat, it has been postulated to occur around the time of birth. However, recent evidence suggests that the secretion may start much earlier, as soon as the lateral choroid plexuses first appear (around E14). Purpose To investigate the developmental profiles of two major enzymes responsible for CSF secretion in the adult, Na, K-ATPase (NKA) and carbonic anhydrase II (CAII). Methods The developmental profiles of both enzymes were investigated using immunohistochemistry and Western Blot analysis in tissue from embryonic day (E) 15, 18, postnatal day (P) 0, 9 and adult rats. Result Western Blot analysis showed low levels of NKA at E15 followed by a progressive increase with age. Immunohistochemistry confirmed the presence of NKA on the apical membrane of the lateral ventricular choroid plexus epithelium from E15 onwards. Western Blot analysis of CAII was complicated by its presence in blood, but the amount of protein increased with age. Immunohistochemically, CAII appeared in the lateral ventricular choroid plexus between P0 and P9. Conclusions The low levels of NKA and CAII during early choroid plexus development indicate that other mechanisms, such as the previously described specific protein transfer across epithelial cells, may be involved in early CSF secretion and movement of water into the cerebral ventricles.

Johansson, Pia; Dziegielewska, Katarzyna; Saunders, Norman

2008-01-01

442

The Planning of Higher Education. The Social Demand. Educational Studies and Social Sciences: A Third Level Course. Economics and Education Policy II.  

ERIC Educational Resources Information Center

Two papers comprising Block II of a course in economics and education policy are presented along with a conclusion to Block I and II of the series published by the Open University. The first paper, "Education as a Social Investment," by Vera Morris, focuses on such areas as the identification of costs and benefits, the return on the social…

Morris, Vera; And Others

443

Genetic variation in the carbonic anhydrase isozymes of macaque monkeys. II. Inheritance of red cell carbonic anhydrase levels in different carbonic anhydrase I genotypes of the pig-tailed macaque, Macaca nemestrina  

Microsoft Academic Search

The inheritance of red blood cell levels of carbonic anhydrase isozymes (CA I and CA II) has been studied in different carbonic anhydrase I genotypes of the pig-tailed macaque, Macaca nemestrina. Quantitation of CA I isozymes in a series of animals indicates that the total CA I concentration is the sum of the average effects of each CA I structural

Joseph DeSimone; Erik Magid; Richard E. Tashian

1973-01-01

444

Statistical properties of the one dimensional Anderson model relevant for the nonlinear Schrödinger equation in a random potential  

NASA Astrophysics Data System (ADS)

The statistical properties of overlap sums of groups of four eigenfunctions of the Anderson model for localization as well as combinations of four eigenenergies are computed. Some of the distributions are found to be scaling functions, as expected from the scaling theory for localization. These enable to compute the distributions in regimes that are otherwise beyond the computational resources. These distributions are of great importance for the exploration of the nonlinear Schrödinger equation (NLSE) in a random potential since in some explorations the terms we study are considered as noise and the present work describes its statistical properties.

Michaely, E.; Fishman, S.

2012-11-01

445

The spatial dependence of spin and charge correlations in a one-dimensional, single impurity, Anderson model  

SciTech Connect

Summarized are the results of a series of quantum Monte Carlo calculations of the spatial dependence of spin and charge correlations in a one-dimensional, single impurity, symmetric Anderson model. We corroborated several features of the model of Gubernatis, Hirsch, and Scalapino, and because we achieved lower temperatures, we were able to identify several additional unusual features in the behavior of the correlations as functions of U and ..beta... We also showed the existence of a charge compensation sum role and found a power law decay of the correlations at low temperatures.

Gubernatis, J.E.

1986-01-01

446

Commensurability effects in one-dimensional Anderson localization: Anomalies in eigenfunction statistics  

NASA Astrophysics Data System (ADS)

The one-dimensional (1d) Anderson model (AM), i.e. a tight-binding chain with random uncorrelated on-site energies, has statistical anomalies at any rational point f=2a?E, where a is the lattice constant and ?E is the de Broglie wavelength. We develop a regular approach to anomalous statistics of normalized eigenfunctions ?(r) at such commensurability points. The approach is based on an exact integral transfer-matrix equation for a generating function ?r(u, ?) (u and ? have a meaning of the squared amplitude and phase of eigenfunctions, r is the position of the observation point). This generating function can be used to compute local statistics of eigenfunctions of 1d AM at any disorder and to address the problem of higher-order anomalies at f=pq with q > 2. The descender of the generating function Pr(?)??r(u=0,?) is shown to be the distribution function of phase which determines the Lyapunov exponent and the local density of states.In the leading order in the small disorder we derived a second-order partial differential equation for the r-independent ("zero-mode") component ?(u, ?) at the E = 0 (f=12) anomaly. This equation is nonseparable in variables u and ?. Yet, we show that due to a hidden symmetry, it is integrable and we construct an exact solution for ?(u, ?) explicitly in quadratures. Using this solution we computed moments Im = N (m ? 1) for a chain of the length N ? ? and found an essential difference between their m-behavior in the center-of-band anomaly and for energies outside this anomaly. Outside the anomaly the "extrinsic" localization length defined from the Lyapunov exponent coincides with that defined from the inverse participation ratio ("intrinsic" localization length). This is not the case at the E = 0 anomaly where the extrinsic localization length is smaller than the intrinsic one. At E = 0 one also observes an anomalous enhancement of large moments compatible with existence of yet another, much smaller characteristic length scale.

Kravtsov, V. E.; Yudson, V. I.

2011-07-01

447

Visual test of subparts per billion-level copper(ii) by Fe3O4 magnetic nanoparticle-based solid phase extraction coupled with a functionalized gold nanoparticle probe  

NASA Astrophysics Data System (ADS)

By combining Fe3O4 magnetic nanoparticle-based solid phase extraction with a gold nanoparticle-based visual test, a novel method was developed for the field assay of Cu(ii) in environmental water at subparts per billion-levels within 30 min. When a 200 mL water sample was treated with 12.5 mg L-1 Fe3O4 nanoparticles by the proposed procedure, the detection limit with the naked eye was 0.2 ?g L-1 Cu(ii). The proposed method is very specific to Cu(ii), with tolerance against at least 100-fold amounts of other environmentally relevant metal ions except for Hg(ii) (25-fold), and was successfully applied to the detection of trace Cu(ii) in tap water, river water, and treated wastewater, and results agreed well with that determined by inductively coupled plasma-mass spectrometry (ICP-MS).By combining Fe3O4 magnetic nanoparticle-based solid phase extraction with a gold nanoparticle-based visual test, a novel method was developed for the field assay of Cu(ii) in environmental water at subparts per billion-levels within 30 min. When a 200 mL water sample was treated with 12.5 mg L-1 Fe3O4 nanoparticles by the proposed procedure, the detection limit with the naked eye was 0.2 ?g L-1 Cu(ii). The proposed method is very specific to Cu(ii), with tolerance against at least 100-fold amounts of other environmentally relevant metal ions except for Hg(ii) (25-fold), and was successfully applied to the detection of trace Cu(ii) in tap water, river water, and treated wastewater, and results agreed well with that determined by inductively coupled plasma-mass spectrometry (ICP-MS). Electronic supplementary information (ESI) available: Experimental details, synthesis, and characterization of Cys-AuNPs and Fe3O4 NPs, magnetic-solid phase extraction and colorimetric test procedures, and effects of parameters on the extraction efficiency. See DOI: 10.1039/c2nr31753b

Tan, Zhi-Qiang; Liu, Jing-Fu; Jiang, Gui-Bin

2012-10-01

448

Topics in Semiconductor Physics: Part I. Phonons in Semiconducting Alloys and Alloy Superlattices. Part II. Deep Energy Levels of Defects in Mercury-Cadmium Telluride and Wurtzite Semiconductors.  

NASA Astrophysics Data System (ADS)

This thesis consists of two parts. The first part is devoted to the study of vibrational properties of semiconducting alloys and alloy superlattices. The second part deals with deep energy levels of defects in semiconductors. In Part I, densities of phonon states are evaluated using the recursion method for quasi-binary III-V semiconducting alloys: Al(,x)Ga(,1-x)As, Ga(,1-x)In(,x)As, Ga(,1-x)In(,x)Sb, GaAs(,1-x)Sb(,x), and InAs(,1-x)Sb(,x); metastable (III -V)(,1-x)IV(,2x) alloys: (GaSb)(,1-x)Ge(,2x) and (GaAs)(,1 -x)Ge(,2x); and alloy superlattices: GaAs/Al(,x)Ga(,1-x)As. New features in the densities of states, not present in those of the parent compounds, are associated with vibrations arising from various atomic arrangements in these substitutionally disordered alloys. For the alloy superlattices, the expected zone-folding effects are properly accounted for in the density-of-states spectra. Raman scattering data and infrared reflection data are interpreted based on the calculated densities of states for the above three systems. In spite of the neglect of long-range forces, the present calculations prove to be useful for a qualitative understanding of the observed mode behaviors and the disorder-activated modes. In Part II, deep energy levels of sp('3)-bonded impurities with the central-cell atomic-like defect potential are obtained using the Green's function technique. The host materials considered here are Hg(,1-x)Cd(,x)Te alloys which have a narrow and variable band gap, and wurtzite semiconductors: AlN, CdS, CdSe, ZnS, and ZnO, which have large band gaps. A variety of defects responsible for trapping centers are identified. Our results would be instrumental in improving the quality of these technologically important materials.

Kobayashi, Akiko

449

Finite-cluster calculations of the conductivity tensor, with application to alkali fullerides and the Anderson impurity model  

NASA Astrophysics Data System (ADS)

We have developed a method, based on direct evaluation of the Kubo-Greenwood formula on finite clusters to evaluate the zero-temperature conductivity tensor in zero and low magnetic fields for tight-binding models. We have applied this method to square-lattice Anderson impurity models, and to a class of models inspired by the alkali fullerides A3C 60. Experiments on A3C60 show what appears to be a "universal" relation between Hall coefficient and lattice constant; such variations with lattice constant have usually been interpreted as indicating that conduction bandwidth is the key physical property that is varying (everything else being nearly constant). However, our calculations are inconsistent with this standard interpretation, and we find that the data can only be accounted for within the models under consideration if one accepts the radical suggestion that the effective conduction band filling varies significantly with lattice constant. These calculations also exhibit enormous deviations from Matthiessen's rule. Our results for the Anderson impurity model appear to exhibit the universal conductance fluctuations that would be expected in this sort of finite-cluster calculation. We present evidence for unanticipated universal fluctuations in the low-field Hall conductivity.

Steffen, David Grant

2003-07-01

450

Preliminary report on coal resources of the Wyodak-Anderson coal zone, Powder River Basin, Wyoming and Montana  

USGS Publications Warehouse

The National Coal Resource Assessment (NCRA) project by the U.S. Geological Survey is designed to assess US coal with the greatest potential for development in the next 20 to 30 years. Coal in the Wyodak-Anderson (WA) coal zone in the Powder River Basin of Wyoming and Montana is plentiful, clean, and compliant with EPA emissions standards. This coal is considered to be very desirable for development for use in electric power generation. The purpose of this NCRA study was to compile all available data relating to the Wyodak- Anderson coal, correlate the beds that make up the WA coal zone, create digital files pertaining to the study area and the WA coal, and produce a variety of reports on various aspects of the assessed coal unit. This report contains preliminary calculations of coal resources for the WA coal zone and is one of many products of the NCRA study. Coal resource calculations in this report were produced using both public and confidential data from many sources. The data was manipulated using a variety of commercially available software programs and several custom programs. A general description of the steps involved in producing the resource calculations is described in this report.

Ellis, Margaret S.; Gunther, Gregory L.; Flores, Romeo M.; Ochs, Allen M.; Stricker, Gary D.; Roberts, Steven B.; Taber, Thomas T.; Bader, Lisa R.; Schuenemeyer, John H.

1998-01-01

451

Nailing the coffin shut on doubts that violent video games stimulate aggression: comment on Anderson et al. (2010).  

PubMed

Over the past half century the mass media, including video games, have become important socializers of children. Observational learning theory has evolved into social-cognitive information processing models that explain that what a child observes in any venue has both short-term and long-term influences on the child's behaviors and cognitions. C. A. Anderson et al.'s (2010) extensive meta-analysis of the effects of violent video games confirms what these theories predict and what prior research about other violent mass media has found: that violent video games stimulate aggression in the players in the short run and increase the risk for aggressive behaviors by the players later in life. The effects occur for males and females and for children growing up in Eastern or Western cultures. The effects are strongest for the best studies. Contrary to some critics' assertions, the meta-analysis of C. A. Anderson et al. is methodologically sound and comprehensive. Yet the results of meta-analyses are unlikely to change the critics' views or the public's perception that the issue is undecided because some studies have yielded null effects, because many people are concerned that the implications of the research threaten freedom of expression, and because many people have their identities or self-interests closely tied to violent video games. PMID:20192555

Huesmann, L Rowell

2010-03-01

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