Scour
Mostrando 1-9 de 9 artigos, teses e dissertações.
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1. Scale effect on mean pressures: study of two reduced models of a ski jump spillway
RESUMO O vertedouro tipo salto esqui está presente em grandes barragens brasileiras. Após a operação desse tipo de vertedouro se origina uma fossa de erosão a jusante, que complementa o sistema de dissipação de energia, pois o jato é amortecido pelo colchão d’água. À medida que a escavação da fossa de erosão evolui, sua forma se altera, haven
RBRH. Publicado em: 01/07/2019
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2. CaracterizaÃÃo da cobertura superficial em encosta na Bacia do Rio das Pombas, Guarapuava â PR: bases para entendimento da gÃnese erosiva em tÃneis / Characterization of hillside superficial covering at the basin of Rio das Pombas, Guarapuava, Paranà state: basis for understading of tunnel erosion genesis
On the Guarapuava Plateau/Palmas, in a low slope hillside of superficial covering from basaltic origins, on the right bank of the Rio das Pombas, Paranà state, processes of tunnel erosion (pipes) were identified. These are subsuperficial erosion processes with typical features, such as subsidence of the tunnel roof and rebate structures, which tend to evolv
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 08/07/2011
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3. Avaliação da suscetibilidade do aquífero freático à contaminação por necrochorume em Bonito MS / The Vulnerability Evaluation of Unconfined Aquifer by Necrochorume Contamination in Bonito MS
Os cemitérios são fontes que causam de contaminação dentre os quais, destaca-se o risco de contaminação das águas subterrâneas por microrganismos presentes na coliquação. O aqüífero livre é contaminado na área interna do cemitério podendo se estender para regiões próximas, aumentando o risco de saúde pública. O objetivo deste estudo foi o
Publicado em: 2009
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4. MaturaÃÃo fisiolÃgica e avaliaÃÃo do potencial fisiolÃgico de sementes de Campomanesia xanthocarpa O. Berg / Physiological maturity and evaluation of potential for seeds of physiological Campomanesia xanthocarpa O. Berg
In the present work, were used fruits of Campomanesia xanthocarpa O. BERG, collected in the rural area of Marechal CÃndido Rondon - PR, in the months of September 2005 and 2006. The first stage of collecting the fruits were harvested ripe, 8 matrices, brought to the laboratory of Technology Seeds and Mudas. Initially were selected, seeds extracted with the
Publicado em: 2007
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5. Bed load transport by submerged jets
Some similarities are presented between the bed load transport of noncohesive grains in long rivers and at a local, jet-induced scour. Experiments are described in which a submerged two-dimensional slot nozzle, inclined downward, eroded a deep sand bed. The rate of erosion at the very beginning of a scour was evaluated and compared with river data by use of
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6. Fluvial processes and local lithology controlling abundance, structure, and composition of mussel beds
In the Salmon River Canyon, Idaho, the fresh-water pearl mussel, Margaritifera falcata, attains maximum density and age in river reaches where large block-boulders structurally stabilize cobbles and interstitial gravels. We hypothesize that block-boulders prevent significant bed scour during major floods, and these boulder-sheltered mussel beds, although rar
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7. Experimental neonatal colibacillosis in cows: immunoglobin classes involved in protection.
Pregnant cows were vaccinated with one of four vaccine preparations to induce passive immunity in their offspring against a homologous oral challenge with Escherichia coli strain B-44. Quantitative assays of specific antibody in colostral whey from both immunized and nonimmunized dams revealed that immunoglobulin G, immunoglobulin A (IgA), and immunoglobulin
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8. Reproductive efficiency and calf survival in Ontario beef cow-calf herds: a cross-sectional mail survey.
A survey of the efficiency of production of Ontario beef cow-calf herds was conducted using a stratified systematic random sample of Ontario producers. In general, about 87% of females exposed to breeding produced a live calf and 6% of these died before reaching four weeks of age. The herd to herd variation in these rates was quite large, the coefficient of
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9. A field trial to evaluate the efficacy of a combined rotavirus-coronavirus/Escherichia coli vaccine in dairy cattle.
A field trial was designed to determine the efficacy of a combination rotavirus-coronavirus/Escherichia coli vaccine on dairy farms in southwestern Ontario. In Part A of the trial, 321 cows on 15 farms were randomly assigned to either vaccination or placebo groups. On eight farms, 50% of the dams were vaccinated, while on the other seven farms, 80% of the da