13,565 research outputs found
B Physics at the Z0 Resonance
B physics results from e+ e- annihilation at the Z0 resonance are reviewed. A
vast program is summarised, including the study of B+, B0d, B0s and b baryon
lifetimes, the time dependence of B0d and B0s oscillations, the width
difference in the B0s system, and the measurements of the magnitudes of the CKM
matrix elements Vcb and Vub.Comment: 17 pages, 8 figures, presented at the UK Phenomenology Workshop on
Heavy Flavour and CP Violation, 17-22 September 200
Study of color connections in annihilation
We replace in the event generator JETSET the color singlet chain connection
with the color separate state one as the interface between the hard and soft
sectors of hadronic processes. The modified generator is applied to produce the
hadronic events in annihilation. It describes the experimental data
at the same level as the original JETSET with default parameters. This should
be understood as a demonstration that color singlet chain is not the unique
color connection. We also search for the difference in special sets of
three-jet events arising from different color connections, which could subject
to further experimental test.Comment: 23 pages, 8 figures, 4 tables, Revtex
Comparison between furrow and drip irrigation of melon in the São Francisco region.
Melon crop in the São Francisco Region, Brazil, responded differently to the method utilized for applying water.bitstream/item/182918/1/FL-00700.pd
Composite Scalars at LEP: Constraining Technicolor Theories
LEPI and LEPII data can be used to constrain technicolor models with light,
neutral pseudo-Nambu-Goldstone bosons, Pa. We use published limits on branching
ratios and cross sections for final states with photons, large missing energy,
jet pairs, and b bbar pairs to constrain the anomalous Pa Z0 Z0, Pa Z0 photon,
and Pa photon photon couplings. From these results, we derive bounds on the
size of the technicolor gauge group and the number of technifermion doublets in
models such as Low-scale Technicolor.Comment: 27 pages (including title page), 15 figures, 6 tables. version 2: In
addressing PRD referee comments, we have significantly expanded our
manuscript, to include detailed discussion of limits from LEP II data, as
well as expanding the number or specific models to which we apply our
results. As a result, we have changed the title from "Z0 decays to composite
scalars: constraining technicolor theories
Análise do preço do bezerro pago no Pantanal da Nhecolândia, no período de 2001 a 2008.
O planejamento da fazenda de gado de corte é determinado não só por índices zootécnicos e por condições edafoclimáticas, mas também por um conjunto de variáveis econômicas. Estas podem atuar sobre o mercado de bovinos, induzindo transformações e mudanças no sistema de produção e na caracterização dos ciclos pecuários, incentivando, sustando e até desencorajando o produtor (Cadavid Garcia, 1984). A análise de preços é ferramenta importante para o produtor no processo de tomada de decisão. Além de auxiliar na indicação de prioridades de pesquisa e no processo de difusão de tecnologias, de acordo com as relações de preços de produtos e dos fatores de produção (Cadavid Garcia, 1982).bitstream/CPAP-2009-09/56777/1/COT70.pdfFormato eletrônico
Análise sequencial no melhoramento do feijoeiro.
O objetivo do presente trabalho foi o de quantificar a melhoria na eficiência do processo seletivo por meio da análise seqüencial via procedimento best linear umbiased predictor (BLUP) em um ciclo seletivo do programa de seleção recorrente da UFLA (Universidade Federal de Lavras)
Parental cultural models and resources for understanding mathematical achievement in culturally diverse school settings
This paper proposes that the theoretical concept of cultural models can offer useful insights into parental involvement in their child’s mathematical achievement and the resources they use to go about gaining information in culturally diverse learning settings. This examination takes place within a cultural-developmental framework and draws on the notion of cultural models to explicate parental understandings of their child’s mathematics achievement and what resources are used to make sense of this. Three parental resources are scrutinized: (a) the teacher, (b) examination test results, and (c) constructions of child development. The interviews with 22 parents revealed some ambiguity around the interpretation of these resources by the parent, which was often the result of incongruent cultural models held between the home and the school. The resources mentioned are often perceived as being unambiguous but show themselves instead to be highly interpretive because of the diversity of cultural models in existence in culturally diverse settings. Parents who are in minority or marginalized positions tend to have difficulties in interpreting cultural models held by school, thereby disempowering them to be parentally involved in the way the school would like
Custo de produção em pecuária de corte em 2009, no Pantanal de Aquidauana (MS).
Conforme os cálculos feitos com os dados levantados na região de Aquidauana, a receita da pecuária de corte consegue cobrir o custo operacional efetivo (COE) e o custo operacional total (COT), é suficiente para abater a depreciação, mas insuficiente para cobrir o capital investido (CI). Este fato indica que a atividade é um investimento sustentável e lucrativo, no curto e no médio prazo, mas não no longo prazo, pois o produtor não conseguirá remunerar seu capital investido.bitstream/CPAP-2010/57273/1/COT77.pd
Custo de produção em pecuária de corte em 2009, no Pantanal de Corumbá (MS).
De acordo com os cálculos dos dados levantados na região de Corumbá, o estudo revelou que a receita da pecuária de corte consegue cobrir o custo operacional efetivo (COE) e o custo operacional total (COT), é suficiente para abater a depreciação, mas insuficiente para cobrir o capital investido (CI). Este fato indica que a atividade é um investimento sustentável e lucrativo, no curto e no médio prazo, mas não em longo prazo, pois o produtor não conseguirá remunerar seu capital investido.bitstream/CPAP-2010/57272/1/COT76.pd
Prospects for Searching for Excited Leptons during RunII of the Fermilab Tevatron
This letter presents a study of prospects of searching for excited leptons
during RunII of the Fermilab Tevatron. We concentrate on single and pair
production of excited electrons in the photonic decay channel in one CDF/DO
detector equivalent for 2 fb^{-1}. By the end of RunIIa, the limits should be
easily extended beyond those set by LEP and HERA for excited leptons with mass
above about 190 GeV.Comment: 4 pages, 8 figure
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