994 research outputs found
Origin and main ramifications of coeliac artery in Cerdocyon thous
Background: Cerdocyon thous is the canid with the greatest geographical coverage in South America. The aim of this study was to describe the origin, skeletopy, length and main branches of the coeliac artery in C. thous. Materials and methods: The dissections were performed on 14 cadavers of adult specimens, 6 males and 8 females, with a rostrosacral length average of 67.00 ± 4.7 cm and 62.09 ± 5.7 cm, respectively. The specimens were collected dead on highways on the banks of the Atlantic Forest (Rio de Janeiro) and the Pampa biome (Rio Grande do Sul) in Brazil. The cadavers were fixed and preserved in a formaldehyde solution until dissection. The coeliac artery was dissected, the length was measured “in situ” and its main branches were recorded. The coeliac artery emerged as a single artery in all dissected animals. Results: The average length of the coeliac artery was 1.43 ± 0.17 cm in males and 1.39 mm ± 0.24 cm in females, with no significant difference in this measurement between sexes. The predominant skeletopy was at the level of the second lumbar vertebra (57.1%), positioned on average 1.43 cm cranially to the cranial mesenteric artery. In most individuals (92.9%), the classic trifurcation was formed: the coeliac artery branched into the hepatic, left gastric, and lienal arteries. Only 1 male animal presented a bifurcation formed between the hepatic artery and a gastrolienal trunk. Conclusions: These anatomical characteristics are similar to those of other species of the Canidae family, possibly due to their phylogenetic proximity
Comment on "Critique of q-entropy for thermal statistics" by M. Nauenberg
It was recently published by M. Nauenberg [1] a quite long list of objections
about the physical validity for thermal statistics of the theory sometimes
referred to in the literature as {\it nonextensive statistical mechanics}. This
generalization of Boltzmann-Gibbs (BG) statistical mechanics is based on the
following expression for the entropy:
S_q= k\frac{1- \sum_{i=1}^Wp_i^q}{q-1} (q \in {\cal R}; S_1=S_{BG} \equiv
-k\sum_{i=1}^W p_i \ln p_i) .
The author of [1] already presented orally the essence of his arguments in
1993 during a scientific meeting in Buenos Aires. I am replying now
simultaneously to the just cited paper, as well as to the 1993 objections
(essentially, the violation of "fundamental thermodynamic concepts", as stated
in the Abstract of [1]).Comment: 7 pages including 2 figures. This is a reply to M. Nauenberg, Phys.
Rev. E 67, 036114 (2003
Isotopic composition of fragments in multifragmentation of very large nuclear systems: effects of the chemical equilibrium
Studies on the isospin of fragments resulting from the disassembly of highly
excited large thermal-like nuclear emitting sources, formed in the ^{197}Au +
^{197}Au reaction at 35 MeV/nucleon beam energy, are presented. Two different
decay systems (the quasiprojectile formed in midperipheral reactions and the
unique source coming from the incomplete fusion of projectile and target in the
most central collisions) were considered; these emitting sources have the same
initial N/Z ratio and excitation energy (E^* ~= 5--6 MeV/nucleon), but
different size. Their charge yields and isotopic content of the fragments show
different distributions. It is observed that the neutron content of
intermediate mass fragments increases with the size of the source. These
evidences are consistent with chemical equilibrium reached in the systems. This
fact is confirmed by the analysis with the statistical multifragmentation
model.Comment: 9 pages, 4 ps figure
Compositional analysis and physicochemical and mechanical testing of tanned rabbit skins
[EN] Chemical composition and physicochemical and mechanical parameters of New Zealand White rabbit tanned skin were evaluated. Skin samples from 70-d-old males, in natura and semi-finished, were collected for evaluation. The in natura treatment comprise skins without any processing, while semi-finished treatment comprise skins after soaking, fleshing, liming, de-liming, purging, degreasing, pickling, tanning, neutralising, re-tanning and dyeing, followed by oiling, drying, stretching and softening. After tanning, samples from the dorsal and flank regions were removed for tensile and physicochemical testing in the longitudinal and transverse directions. A split plot design was used with plot treatments (leather regions: R1=dorsal and R2=flank) and subplots directions (S1=longitudinal and S2=transversal), using 10 examples per treatment. At the end of processing, the leather analysis revealed low moisture (31.76%), protein (46.48%) and fat content (24.95%), and a high ash content (8.58%). Leather presented a pH of 4.9 and contained 2.0% chromium oxide, 25.5% extractable substances in dichloromethane, and these characteristics were coupled with a higher tensile strength (10.84 N/mm2) in the dorsal region. However, samples in the same region proved to have higher elasticity (64.57%) in the longitudinal direction, although there was no difference in the progressive tearing analysis (21.07-23.50 N/mm). Overall, our analyses suggest that, in this case, the tanned leather product does not have sufficient resistance for application in clothing production.Souza, MR.; Hoch, AL.; Gasparino, E.; Scapinello, C.; Mesquita Dourado, D.; Claudino Da Silva, SC.; Lala, B. (2016). Compositional analysis and physicochemical and mechanical testing of tanned rabbit skins. World Rabbit Science. 24(3):233-238. doi:10.4995/wrs.2016.4037SWORD233238243ABNT. Associação Brasileira de Normas Técnicas. 2014. ABNT NBR ISO 3376: 2014 - Couro - Ensaios físicos e mecânicos – Determinação de resistência à tração e alongamento percentual. Rio de Janeiro, 1-5.ABNT. Associação Brasileira de Normas Técnicas. 2014. NBR - 2589: Couro - Ensaios físicos e mecânicos - Determinação da espessura. Rio de Janeiro, 1.ABNT. Associação Brasileira de Normas Técnicas. 2013. NBR - 11030: couro - Determinação de substâncias extraíveis com diclorometano (CH2Cl2). Rio de Janeiro, 1-3.ABNT. Associação Brasileira de Normas Técnicas. 2013. ABNT NBR 11032: 2013 - Pele e couro - Amostragem na amostra de teste - Procedimento. Rio de Janeiro, 1-4.ABNT. ABNT Associação Brasileira de Normas Técnicas. 2014. NBR – 5398-1: Couro – determinação química do teor de óxido de cromo Parte 1: Quantificação por titulação. Rio de Janeiro, 1-5.ABNT. Associação Brasileira de Normas Técnicas. 2014. NBR - 3377-2: Couro – Ensaios físicos e mecânicos — Determinação da força de rasgamento Parte 2: Rasgamento de extremidade dupla. Rio de Janeiro, 1-3.ABNT. Associação Brasileira de Normas Técnicas. 2014. ABNT NBR 10455: 2014 - Clima de materiais utilizados em calçados e artigos relacionados fabricar. Rio de Janeiro, 1-2.ABNT. Associação Brasileira de Normas Técnicas. 2006. NBR – 11057: Couro –determinação do pH e da cifra diferencial. 2. ed. Rio de Janeiro, 1-3.Cunniff P.A. 1998. Official Methods of Analysis of AOAC International. 16th ed. Arlington: Association of Official Analytical Chemists.Franco, M.L.R.S. 2007. Curtimento de pele de tilápia. In: Boscolo, W.r., Feiden, A. (Orgs.) Industrialização de tilápias. Toledo: GFM Gráfica e editora, 185-223.Freire M.C., Canl R.M. 2000. A pele bovina como matéria-prima. Revista Nacional da Carne, 24: 100-110.Gerhard J. 1998. Posibles fallas e el cuero y e su producción – conceptos, causas, consecuencias, remedios y tipos de cueros. Partner Rübelmann GmbH: Lampertheim (Alemania).Gutterres M. 2001. Distribuição, deposição e interação química de substâncias de engraxe no couro. In: Congresso da federação latino-americana das associações dos químicos e técnicos da indústria do couro, 15, Salvador. Anais... v.1, 108-119.Gutterres M. 2003. Efeito do Curtimento sobre a Microestrutura Dérmica. Revista do Couro Abqtic, Estância Velha, 26: 56-59.Oliveira A.C., Souza M.L.R., Hoch A.L.V., Gasparino E., Scapinello C., Kffuri V.R. Domingues M.C. 2007. Resistência dos couros de coelhos em função do sexo e da idade de abate. Tecnicouro, 28: 52-56.Prado M., Franco M.L.R.S., Uchimura C.M., Souza E.D., Bordignon A.C., Justen A.P., Silva S.C.C., Del Vesco A.P. 2013. Efeito da etapa de engraxe no processo de curtimento das peles de coelhos. Acta Tecnológica, 8: 8-11. http://portaldeperiodicos.ifma.edu.br/index.php/actatecnologica/article/view/131SAEG. 2000. Sistemas de Análises Estatísticas e Genéticas. Versão 8.0. Universidade Federal de Viçosa. Viçosa.Souza M.L.R. 2004. Tecnologia para processamento das peles de peixe. Maringá, PR. Coleção Fundamentum, 11: 14-55.Souza M.L.R. 2006. Tecnologia para processamento de peles de coelhos: peleteria e couro. In Proc: 3rd Rabbit Congress of the Americas, 2006, Maringá –Pr, Brasil. v. 1.Souza M.L.R. 2008. Tecnologia para processamento das peles de peixe. Maringá: Eduem. 3° Ed
Homogenized dynamics of stochastic partial differential equations with dynamical boundary conditions
A microscopic heterogeneous system under random influence is considered. The
randomness enters the system at physical boundary of small scale obstacles as
well as at the interior of the physical medium. This system is modeled by a
stochastic partial differential equation defined on a domain perforated with
small holes (obstacles or heterogeneities), together with random dynamical
boundary conditions on the boundaries of these small holes.
A homogenized macroscopic model for this microscopic heterogeneous stochastic
system is derived. This homogenized effective model is a new stochastic partial
differential equation defined on a unified domain without small holes, with
static boundary condition only. In fact, the random dynamical boundary
conditions are homogenized out, but the impact of random forces on the small
holes' boundaries is quantified as an extra stochastic term in the homogenized
stochastic partial differential equation. Moreover, the validity of the
homogenized model is justified by showing that the solutions of the microscopic
model converge to those of the effective macroscopic model in probability
distribution, as the size of small holes diminishes to zero.Comment: Communications in Mathematical Physics, to appear, 200
Mass and charge identification of fragments detected with the Chimera Silicon-CsI(Tl) telescopes
Mass and charge identification of charged products detected with
Silicon-CsI(Tl) telescopes of the Chimera apparatus is presented. An
identification function, based on the Bethe-Bloch formula, is used to fit
empirical correlation between Delta E and E ADC readings, in order to
determine, event by event, the atomic and mass numbers of the detected charged
reaction products prior to energy calibration.Comment: 24 pages, 7 .jpg figures, submitted to Nucl.Instr.
Adubos verdes e seus efeitos no rendimento da cana-de-açúcar em sistema de plantio direto.
O objetivo deste trabalho foi avaliar adubos verdes e seus efeitos no rendimento da cana-de-açúcar em sistema de plantio direto (SPD). O trabalho foi realizado em Campos dos Goytacazes (RJ), no período de dezembro de 2003 a julho de 2005. O delineamento experimental foi em blocos casualizados, com quatro repetições. Os tratamentos foram: feijão-de-porco (Canavalia ensiformis), mucuna-preta(Mucuna aterrimum), crotalária (Crotalária juncea) em plantio direto e vegetação espontânea em preparo convencional (testemunha). Com crotalária aos 35 dias após emergência (DAE) houve maior taxa de cobertura do solo – 87% – e, aos 92 DAE produziu 17.852 kg ha-1 de matéria seca, respectivamente, 41%, 78% e 407% superior ao feijão-de-porco, mucuna e vegetação espontânea, além de superá-las em acúmulos de K, Mg, S, Zn e Fe. O feijão-de-porco e a mucuna proporcionaram o maior teor de N na parte aérea. Com feijão-de-porco, os teores de P e Ca foram maiores que a crotalária e a mucuna. Com vegetação espontânea, o maior teor de K foi na parte aérea. As leguminosas acumularam maiores quantidades de N e Cu do que a vegetação espontânea. A crotalária e o feijão-de-porco acumularam 66% a mais de P na parte área que a mucuna. O SPD utilizando a adubação verde contribuiu significativamente para a maior produtividade de cana-de-açúcar, 135.863 kg ha-1, sendo 37% superior ao PC com a vegetação espontânea
Evidence of Color Coherence Effects in W+jets Events from ppbar Collisions at sqrt(s) = 1.8 TeV
We report the results of a study of color coherence effects in ppbar
collisions based on data collected by the D0 detector during the 1994-1995 run
of the Fermilab Tevatron Collider, at a center of mass energy sqrt(s) = 1.8
TeV. Initial-to-final state color interference effects are studied by examining
particle distribution patterns in events with a W boson and at least one jet.
The data are compared to Monte Carlo simulations with different color coherence
implementations and to an analytic modified-leading-logarithm perturbative
calculation based on the local parton-hadron duality hypothesis.Comment: 13 pages, 6 figures. Submitted to Physics Letters
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