Search Results - (Author, Cooperation:C. Bernard)

2018-03-06

American Physical Society (APS)

0556-2821

1089-4918

Physics

Lattice field theories, lattice QCD

2018-07-17

Institute of Physics Publishing (IOP)

1748-0221

Physics

Watson, Bernard C. [Verfasser]

Book

XIV, 121 S.

0884101592

English

2018-04-03

American Physical Society (APS)

0556-2821

1089-4918

Physics

Lattice field theories, lattice QCD

2018-09-28

American Physical Society (APS)

0556-2821

1089-4918

Physics

Lattice field theories, lattice QCD

2018-09-06

American Association for the Advancement of Science (AAAS)

2375-2548

Natural Sciences in General

2011-04-30

American Association for the Advancement of Science (AAAS)

0036-8075

1095-9203

Biology

Chemistry and Pharmacology

Computer Science

Medicine

Natural Sciences in General

Physics

Animals ; Fishes/*classification ; Guyana ; *Internet ; Wit and Humor as Topic

2013-11-16

American Association for the Advancement of Science (AAAS)

0036-8075

1095-9203

Biology

Chemistry and Pharmacology

Computer Science

Medicine

Natural Sciences in General

Physics

Africa, Eastern ; Amphibians ; Animals ; Asia ; Asia, Southeastern ; *Biodiversity ; Birds ; Central America ; *Conservation of Energy Resources ; Ethiopia ; Mammals ; South America ; Trees ; Wolves

2018-10-30

American Physical Society (APS)

0556-2821

1089-4918

Physics

Lattice field theories, lattice QCD

1573-109X

Viterbi algorithm ; trace-back ; survivor memory ; VLSI area requirements

Springer Online Journal Archives 1860-2000

Electrical Engineering, Measurement and Control Technology

Abstract The trace-back technique is an effective approach for survivor memory management in the Viterbi algorithm. It is especially attractive when the number of states in the trellis is large, in which case the register exchange approach is impractical due to the area required for wiring. Previous descriptions of the trace-back technique have assumed either one or two trace-back pointers and have made specific assumptions about the speeds of those pointers. In this paper we present a general framework for implementing the trace-back technique with any number of trace-back pointers and with relaxed assumptions about the speeds of the pointers. We also show that the use of additional trace-back pointers reduces the memory requirements. Two implementations of the generalized trace-back techniques based on standard RAMs and custom shift registers are presented.

Electronic Resource

2019-07-10

"The article explores the contours of multiple identities in contrast to singular identities in situations of social complexity and cultural diversity. Nyamnjoh's concepts of 'incompleteness' and 'frontier Africans' imply an alternative approach to identity formation. Although the formation of one's own, singular identity is a necessary stage in the development of each individual, it has specific limitations. This is especially true in situations of complexity and diversity and where the achievement of social cohesion is an important goal. With reference to existing theories of identity formation, an alternative framework is proposed that is more appropriate for the dynamic, open-ended nature of identity and better suited to encourage the enrichment of identity. The role of imagination, a strategy for crossing borders (with reference to Clingman's concept of a 'grammar of identity'), the search for commonality, and the effect of historical memory are discussed. Enriched and multiple identities are not achieved by replacement or exchange, but by widening (existing) singular identities into a more inclusive and diverse understanding of the self." (author's abstract)

"Der Autor dieses Beitrags versucht, die Konturen multipler im Gegensatz zu singularen Identitäten in Situationen sozialer Komplexität und kultureller Vielfalt zu ermitteln. Die theoretischen Konzepte Francis B. Nyamnjohs zu incompleteness und frontier Africans implizieren ein alternatives Verständnis von Identitätsbildung. Zwar ist die Bildung einer eigenen, singularen Identität eine notwendige Stufe der Persönlichkeitsentwicklung, sie ist allerdings nicht immer ausreichend. Dies gilt insbesondere für komplexe und von großer Vielfalt gekennzeichnete Situationen, in denen sozialer Zusammenhalt besonders wichtig ist. Unter Bezug auf Theorien zur Identitätsbildung schlägt der Autor einen alternativen Ansatz vor, der dem dynamischen, nie abgeschlossenen Wesen der Identität Rechnung trägt und zur Identitätsbereicherung ermutigt. Er diskutiert die Rolle der Vorstellungskraft als Strategie der Grenzüberschreitung (unter Bezug auf Clingmans Konzept einer grammar of identity), das Bemühen um Gemeinsamkeit und den Einfluss des historischen Gedächtnisses. Aus seiner Sicht entstehen bereicherte und multiple Identitäten nicht durch Ersatz oder Austausch, sondern durch die Erweiterung von (existierenden) singularen Identitäten hin zu einem inklusiveren und facettenreicheren Verständnis des Selbst." (Autorenreferat)

Sozialwissenschaften, Soziologie ; Psychologie ; Social sciences, sociology, anthropology ; Psychology ; Ethnologie, Kulturanthropologie, Ethnosoziologie ; Sozialpsychologie ; Social Psychology ; Ethnology, Cultural Anthropology, Ethnosociology ; Identität ; kulturelle Vielfalt ; Identitätsbildung ; Republik Südafrika ; cultural diversity ; identity formation ; Republic of South Africa ; identity

journal article, Zeitschriftenartikel

2018-04-27

MDPI Publishing

1099-4300

Chemistry and Pharmacology

Physics

2018-05-05

MDPI Publishing

2071-1050

Energy, Environment Protection, Nuclear Power Engineering

2018-02-18

Wiley-Blackwell

0007-0963

1365-2133

Medicine

2018-08-30

American Association for the Advancement of Science (AAAS)

2375-2548

Natural Sciences in General

1089-7690

AIP Digital Archive

Physics

Chemistry and Pharmacology

Liquid n-tridecane (C13H28) chains confined between two parallel hard walls separated by 5.0 nm have been studied by Monte Carlo simulations, employing united CH2 atoms linked with fixed bond lengths and angles and continuously varying torsional angles subject to appropriate interaction energies. Molecules located in the central region are in remarkable agreement with ideal unperturbed chains. Significant influences of walls persist over a distance of ∼1.5 nm, exhibiting progressively less-dense and less-pronounced segmental layers of ∼0.4 nm thickness. Segmental orientations preferentially aligned along the surface are found only in the first layer, accompanied by little perturbations in the fraction of trans-conformations. Furthermore, nearly all the chain units in the first segmental layer adjacent to the walls belong to two-dimensional chains, and exhibit considerable orientational correlations between neighboring segments of different chains. The terminal portions of some of the molecules in the succeeding layer are also located in the first layer, thus increasing the fraction of methyl chain ends in contact with the walls. These findings match very closely the experimental results of surface forces and viscosities of liquid n-alkanes confined between two mica plates, measured as a function of the plate separation.

Electronic Resource

1089-7690

AIP Digital Archive

Physics

Chemistry and Pharmacology

The conventional method of data analysis and interpretation of time-resolved multiple quantum (MQ) nuclear magnetic resonance (NMR) spectra of solids is closely examined. Intensity profiles of experimental 1H MQ NMR spectra of polycrystalline adamantane and hexamethylbenzene serve to test the Gaussian statistical model approach. Consequences of this model are explored with a least-squares fitting procedure, transformation of data to yield linear plots, and a scaling analysis. Non-Gaussian behavior of the MQ NMR spectral intensity profiles, as a function of order of coherences, is demonstrated with all these methods of analysis. A heuristic argument, based on the multiplicative properties of dipolar coupling constants in the equation of motion of the density operator, leads to the prediction of exponentially decaying MQ NMR spectral intensity profiles. Scaling analysis and semilog plots of experimental time-resolved MQ NMR spectra of adamantane and hexamethylbenzene support this deduction. Dynamical scale invariance in the growth process of multiple spin coherences is revealed with this new approach. The validity of spin counting in solids with MQ NMR is discussed in light of the present results.

Electronic Resource

1471-4159

Blackwell Publishing Journal Backfiles 1879-2005

Medicine

Abstract: A developmental study of myelin basic protein (MBP) variants in eight regions of pig nervous system (NS) was performed using a quantitative electroimmunoblotting procedure. Four major MBP forms with apparent molecular weights of 21.5K, 20.2K, 18.5K, and 17.3K were identified in both the CNS and the PNS and were detected as early as 22 days before birth. Quantification of the most abundant forms, the 21.5K and 18.5K MBPs, revealed characteristic profiles of accumulation of these two variants in different regions of the NS. The ratio of 21.5K:18.5K MBP varied with developmental time as well as with the various NS regions, peaking 20 days postnatally. The 17.3K MBP was observed from embryonic stages to adulthood, as were the 21.5K and 18.5K forms. In contrast, the 20.2K variant appeared most abundant from 10 days before to 22 days after birth and thereafter decreased in intensity so as to be no longer detectable in the brain of a 5-year-old pig. A similar pattern was also observed with an anti-MBP-reacting protein with an apparent molecular weight of 23K. Taken together, these results suggest that in the pig NS, the expression of MBP variants may be regulated both regionally and developmentally.

Electronic Resource

1471-4159

Blackwell Publishing Journal Backfiles 1879-2005

Medicine

Abstract: A basic protein has been purified from the CNS myelin of the gummy shark (Mustelus antarticus). Electroblotting was used to examine the capacity of rabbit antisera raised against this electrophoretically pure protein to recognize myelin basic protein from higher vertebrates. The antisera bound to two shark proteins including the original polypeptide antigen and to chicken, bovine, and human myelin basic proteins. Thus, the shark protein appeared to possess antigenic determinants that have been retained through evolutionary divergence of these proteins. Whereas bovine basic protein caused experimental allergic encephalomyelitis in guinea pigs, animals that received injections of the shark protein showed neither clinical nor histological signs of this disease. However, tests for delayed-type hypersensitivity and for Arthus reaction following injection with the shark protein revealed a T-cell-mediated response to this antigen and substantial cross-reactivity with higher vertebrate basic proteins. Analysis of the amino acid composition of the shark protein, and comparison of its tryptic peptide map with that of the bovine protein, revealed substantial changes in the amino acid sequence. Although the shark protein has some antigenic determinants in common with the proteins from higher vertebrates, it appears that much of the structure differs.

Electronic Resource

1471-4159

Blackwell Publishing Journal Backfiles 1879-2005

Medicine

Abstract Degradation of myelin basic protein (MBP) in human myelin was monitored by electroimmunoblotting. Problems of variation between, as well as within, electroimmunoblots were overcome by the introduction of an internal standard in each sample, thus allowing reproducible quantification of MBP. The Ca2+-dependent protease acting on MBP was active at endogenous levels of Ca2+ (∼300 μg/g myelin) and was inhibited in the presence of Ca2+ chelators. Extensive degradation of MBP occurred rapidly in the presence of added Ca2+, reaching a plateau after a 1 h incubation (80–85% degradation). The proteolytic activity was not enhanced in the presence of 2-mercaptoethanol. It was most active at neutral pH and at temperatures approaching physiological conditions. No difference was observed between proteolytic activities of control and multiple sclerotic myelin. It is suggested that fluctuations in the accessibility of free Ca2+ to the protease may lead to the regulation of Ca2+-activated myelinolysis.

Electronic Resource