Efficiency of low versus high airline pressure in stunning cattle with a pneumatically powered penetrating captive bolt gun

The efficiency of stunning cattle was assessed in 443 animals (304 pure Zebu and 139 crossbred cattle), being mainly mature bulls and cows. Cattle were stunned using a Jarvis pneumatically powered penetrating captive bolt gun operating with low (160–175 psi, N = 82) and high (190 psi, N = 363) airline pressure, which was within the manufactures specifications. Signs of brain function and the position of the shots on the heads were recorded after stunning. Velocity of the captive bolt and its physical parameters were calculated. Cattle shot with low pressures showed more rhythmic respiration (27 vs. 8%, P < 0.001), less tongue protrusion (4 vs. 12%, P = 0.03) and less masseter relaxation (22 vs. 48%, P < 0.001). There was an increased frequency of shots in the ideal position when cattle were shot with the low compared to high airline pressures (15.3 vs. 3.1%). Bolt velocity and its physical parameters were significantly (P < 0.01) higher when using high pressure. Airline pressures below 190 psi are inappropriate when shooting adult Zebu beef cattle with pneumatically powered penetrating captive bolt guns

Competitive pressure systems mapping in the brazilian truck market

The automotive business in Brazil achieved 10% of the industry revenue and 6% of the formal employment by 2008. The commercial vehicle segment concentrated so far eight truck makers that experienced their best market figures in 2008, the economy crisis in 2009, and an extraordinary recovery in 2010. Government tax reduction programs as well as special financing incentives were undoubtedly decisive to re-stimulate the business during the crisis. Positive Brazilian perspectives with the boom in the agricultural, oil and gas, mining and infrastructure activities plus the coming sports events call the attention of new players that are quickly implementing different business strategies to become part of the game. New emission regulations starting from 2012 also bring uncertainties, challenges and opportunities. With the growing globalization and market concentration it's critical for any industry understand and minimize the forces of competitive pressures. The main goal of this paper, therefore, is to contribute to the academy with an alternative approach of strategic and behavioral analysis of rivalry and competition different than the five forces model of Porter. Ford, Iveco, MAN, Mercedes-Benz, Scania and Volvo were assessed from 2008 to 2010 within three main performance indicators – unit sales, gross revenues and operating profits – supporting the elaboration of the competitive pressure systems mapping model of D'aveni, including a hypothetical future scenario with a new entrant and the potential impacts in the system. Main findings and results portray the asymmetrical strategic behavior of competitors and the temporary dynamic stability in the Brazilian truck industry

Surviving opinions in Sznajd models on complex networks

The Sznajd model has been largely applied to simulate many sociophysical phenomena. In this paper we applied the Sznajd model with more than two opinions on three different network topologies and observed the evolution of surviving opinions after many interactions among the nodes. As result, we obtained a scaling law which depends of the network size and the number of possible opinions. We also observed that this scaling law is not the same for all network topologies, being quite similar between scale-free networks and Sznajd networks but different for random networks.Comment: 9 pages, 3 figure

Avaliação da aptidão agrícola das terras do município de Capixaba - Estado do Acre.

bitstream/item/63597/1/Oriental-Doc201.PD

Influência do sombreamento causado pelo milho na densidade estomática das folhas do feijoeiro (Phaseolus vulgaris L.) de diferentes hábitos de crescimento.

Resumo 3

Manejo da água de irrigação em culturas de milho e abacaxi no Projeto Jaíba.

O Projeto Jaíba, perímetro de irrigação localizado no norte de Minas Gerais, sempre se caracterizou por possuir lotes agrícolas de pequenas dimensões (principalmente na etapa I) nos quais sempre se desenvolveu, em sua grande parte, uma agricultura de caráter familiar. A cultura da banana tem predominado, entretanto, é urgente que se diversifiquem os cultivos, de forma que haja a sustentabilidade desse agroecossistema. Culturas de ciclos anuais, como o milho, ou mesmo fruteiras que não possuem o caráter permanente, como a abacaxicultura, podem ser alternativas viáveis em áreas que necessitam de práticas racionais de manejo, como a rotação/sucessão ou mesmo o consórcio de culturas. Todas as culturas irrigadas implantadas no Projeto Jaíba, assim como ocorre em grande parte do país, necessitam do manejo racional da água de irrigação, de modo a tornar eficiente o seu uso e minimizar desperdícios. Um dos sistemas que tem melhorado a eficiência no uso da água é o localizado, já implantado em boa parte das fruteiras cultivadas nesse perímetro. Entretanto, muitos coeficientes e parâmetros inerentes a esse sistema de irrigação não têm sido estudados satisfatoriamente, de modo a fornecer resposta rápida aos produtores do local às questões oriundas do manejo racional da irrigação. Este trabalho aqui apresentado teve o objetivo principal de responder parte das questões técnicas acerca da programação da irrigação, fornecendo alguns desses parâmetros ao utilizar a irrigação localizada por gotejamento nas culturas do milho e abacaxi, bem como também se estudou a interação água x nitrogênio para ambas culturas. Além disso, no capítulo final são apresentadas sugestões e recomendações como conseqüência dos resultados obtidos. Esperamos que essa contribuição possa servir para melhorar um pouquinho mais o modo de se manejar a irrigação dessas culturas que venham ser implantadas no Projeto Jaíba.bitstream/CNPMS/16220/1/Doc_29.pd

Correlations between climate network and relief data

Peer reviewedPublisher PD

Correlations between climate network and relief data

Peer reviewedPublisher PD