186,010 research outputs found
A short-story of sin
No full textA brief overview is given of the theory of surface-ion neutralization (SIN) by highlighting studies from the pioneering days to the present time. Emphasis is placed on the 1-electron time-dependent Newns-Anderson (TDNA) model, which has played such a key role in studying resonance charge transfer. Recently, a many-electron (ME) version of the TDNA approach has been formulated to treat two or more electron processes, such as Auger transitions. The equation-of-motion technique is used to obtain the TD coefficients from which the required SIN probabilities can be found. After outlining the ME method, two applications are described. The first deals with the Li+-Cs/W(110) system, while the second addresses the laser enhancement of SIN, in the case of Li+-KBr: and revises some earlier results.PT: J; CR: AMOS AT, 1986, PHYS LETT A, V118, P471 AMOS AT, 1992, SURF SCI LETT, V277, L100 BLANDIN A, 1976, J PHYSIQUE, V37, P369 BLOSS W, 1978, SURF SCI, V72, P277 BRAKO R, 1981, SURF SCI, V108, P253 BRAKO R, 1985, SOLID STATE COMMUN, V55, P633 BRAKO R, 1989, REP PROG PHYS, V52, P655 DAVISON SG, 1986, J ELECTROANAL CH INF, V204, P173 DAVISON SG, 1994, IN PRESS ELECTRONIC GOLDBERG EC, 1985, PHYS REV B, V32, P4375 GOLDBERG EC, 1992, PHYS REV B, V45, P8657 GOODMAN FO, 1993, PHYS REV B, V47, P10685 GRIMLEY TB, 1983, SURF SCI, V124, P305 HAGSTRUM HD, 1954, PHYS REV, V96, P325 HAGSTRUM HD, 1954, PHYS REV, V96, P336 HAGSTRUM HD, 1961, PHYS REV, V122, P83 LANGRETH DC, 1991, PHYS REV B, V43, P2541 LOS J, 1990, PHYS REP, V190, P133 MASSEY HSW, 1930, P CAMB PHILOS SOC, V26, P386 MASSEY HSW, 1931, P CAMB PHILOS SOC, V27, P469 MISKOVIC ZL, 1993, SOLID STATE COMMUN, V87, P883 NAKANISHI H, 1991, SURF SCI, V242, P410 OLIPHANT MLE, 1930, P R SOC LOND A-CONTA, V127, P388 SEBASTIAN KL, 1983, PHYS LETT A, V98, P39 SEBASTIAN KL, 1985, PHYS REV B, V31, P6976 SHEKHTER SS, 1937, ZH EKSP TEOR FIZ, V7, P750 SROUBEK Z, 1974, SURF SCI, V44, P47 SULSTON KW, 1987, SOLID STATE COMMUN, V62, P781 SULSTON KW, 1988, PHYS REV B, V37, P9121 SULSTON KW, 1993, J PHYS-CONDENS MAT, V5, P2134 TULLY JC, 1977, PHYS REV B, V16, P4324 YOSHIMORI A, 1984, PROG THEOR PHYS SUPP, V80, P203 YOSHIMORI A, 1984, SPRINGER SERIES SOLI, V59, P74 YOSHIMORI A, 1986, PROG SURF SCI, V21, P251; NR: 34; TC: 3; J9: PROG SURF SCI; PG: 14; GA: QX183Source type: Electronic(1
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LAMBDA-Graphs : a replacement for PROG
No full textThe PROG feature in LISP can be viewed as a notation for a graph of expressions, corresponding to the standard flowchart. Although PROG and it associated special forms, GO and RETURN, are commonly implemented as LISP functions, we show that PROGs can be transformed into equivalent LAMBDA-expressions that contain no GO or RETURN statements at all, and therefore run faster than PROG by avoiding runtime overhead. The transformation program is included in the report
Mortality of marine planktonic copepods : global rates and patterns
No full textUsing life history theory we make predictions of mortality rates in marine epi-pelagic copepods from field estimates of adult fecundity, development times and adult sex ratios. Predicted mortality increases with temperature in both broadcast and sac spawning copepods, and declines with body weight in broadcast spawners, while mortality in sac spawners is invariant with body size. Although the magnitude of copepod mortality does lie close to the overall general pattern for pelagic animals, copepod mortality scaling is much weaker, implying that small copepods are avoiding some mortality agent/s that other pelagic animals of a similar size do not, We compile direct in situ estimates of copepod mortality and compare these with our indirect predictions; we find the predictions generally match the field measurements well with respect to average rates and patterns. Finally, by comparing in situ adult copepod longevity with predation-free laboratory longevity, we are able to make the first global approximations of the natural rates of predation mortality. Predation and total mortality both increase with increasing temperature; however, the proportion that predation makes of total adult mortality is independent of ambient temperature, on average accounting for around 2/3 to 3/4 of the total
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
O gênero Chamaecrista (Leguminosae: Caesalpinioideae) no Parque Estadual do Rio Preto, São Gonçalo do Rio Preto, Minas Gerais, Brasil
No full textThe genus Chamaecrista has a pantropical distribution and it is well represented in the Brazilian flora, mainly in “campos rupestres” and Riparian forests. In Brazil, 256 species are found, of which 149 are found only in Minas Gerais, corresponding more than a half of genus diversity in the country. The area selected for the study, Parque Estadual do Rio Preto (PERP), belongs to Espinhaço Range. The vegetation is composed mainly of physiognomies of cerrado and “campos rupestres”, also existing areas of gallery forests and galleries. The objective of this study was to carry out the floristic and taxonomic survey of Chamaecrista at PERP, to elaborate key of identification of the species and taxonomic descriptions of the same ones. The collections were carried out within a period of two years, through unsystematic walks. The collected material was identified and deposited in the OUPR and BOTU Herbaria. 19 taxa were collected and described that comprises the Absus, Chamaecrista and Xerocalyx sections.Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Fundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG)Universidade Federal de Ouro Preto Inst. Ciências Exatas e Biológicas Depto. Biodiversidade Evolução e Meio Ambiente Campus Universitário Morro do CruzeiroUniversidade Federal da Paraíba Depto. Sistemática e Ecologia Campos I Centro de Ciências Exatas e da Natureza Cidade UniversitáriaUniversidade Federal do Oeste da Bahia Prog. Pós-graduação em Ciências Ambientais, R. Prof. José Seabra Lemos 316Universidade Estadual de Feira de Santana Prog. Pós-graduação em Botânica, Av. Transnordestina s/nUniversidade Federal de Mato Grosso Depto. Botânica e Ecologia Inst. Biociências, Av. Fernando Corrêa da Costa 2367Universidade Estadual Paulista Prog. Pós-graduação em Ciências Biológicas (Botânica) IBB Depto. Botânica, R. Prof. Dr. Antonio Celso Wagner Zanin s/nUniversidade Estadual Paulista Prog. Pós-graduação em Ciências Biológicas (Botânica) IBB Depto. Botânica, R. Prof. Dr. Antonio Celso Wagner Zanin s/nCNPq: 457911/2013-1FAPEMIG: APQ-02323-1
Hubas-prog/BC-MFA: BC-MFA
No full textIn house R script that performs a BC-MFA. This new release uses ggplot2 based graphics
"Closing the R&D Gap, Evaluating the Sources of R&D Spending"
No full textBoth spending and tax policies have been implemented in the United States with the goal of stimulating private sector research and development (R&D). Karier questions whether current R&D policy, especially the research and experimentation tax credit, can contribute to closing the gap between nondefense expenditures on R&D in the United States and such expenditures in other countries, such as Japan and Germany. He also explores possible changes to our current R&D policy to make it more effective.
Results of Wilcoxon signed rank tests between conditions, prog = progesterone.
No full text<p>The values of <i>Z</i>, <i>P</i> and the effect size <i>r</i>, are shown for each test. Data is shown graphically in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0111891#pone-0111891-g003" target="_blank">Figure 3d</a>.</p><p>Results of Wilcoxon signed rank tests between conditions, prog = progesterone.</p
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Hubas-prog/ASSEMBLE-MICROBE: Second release
No full textThis is the second release of the Supp. Mat. of article entitled "Identity and sequence: The effect of multiple stressors on microphytobenthos assemblages" by James E V Rimmer, Cédric Hubas, Adam Wyness, Bruno Jesus, Morgan Hartley, Andrew J Blight, Antoine Prins, David M Paterson. This new release includes a readme file with indications about R scripts and Script correspondance to help the reader
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