Three-dimensional short-crested waves in Lagrangian form was already solved by Wang(2007). By employing the technique of perturbation analysis, the solution for the entire wave filed was obtained and the results are verified to be correct to second-order. The period of the trajectory of fluid particle in short-crested wave field was manifested in Lagrangian form. Consequently, all the characteristics of the flow field can be vividly described including the moving trajectory of fluid particle. To distinguish two different ways that short-crested waves might take place, Wang(2007)¡¦s results were extended to perturbation¡¦s third-order. The mechanism of resonance phenomenon is then clearly explained. In this study, the analytical results for the three-dimensional short-crested wave field correct to third-order were explicitly derived. The fluid particle with different initial positions or different phases has different moving trajectories. Besides, the period of the trajectory of fluid particle varies with different water depths. These are obviously revealed in our perturbation solutions. The three-dimensional short-crested wave system is successfully verified by reducing to two special cases, two-dimensional progressive waves and standing waves. Also, the analytical results were compared with experimental data including the surface profiles, the pressures, and the paths of fluid particles for validation. Furthermore, the mechanism of resonance phenomenon and the property of angular frequency were explained. Thus, the exactness and generality of the results are firm certified.

No description available.

Agropyron scribneri Vasey (spreading wheatgrass) is endemic to the Rocky Mountains of the Intermountain West. Each distinct population is widely separeated by valley and desert floors. It is morphologically similar to the hybrid between Agropyron trachycaulum (Link) Malte and Sitanion hystrix between Agropyron trachycaulum (Link) Malte and Sitanion hystrix (Nutt.) J. G. Smith as well as the hybrid, A. trachycaulum x A. scribneri. It appears that A. scribneri may have originated de novo from hybidization products of A. trachycaulum and S. hystrix. Agropyron scribneri appears to be morphologically similar to the population of S. hysterix with which it is associated. There is some fertility in the A. trachycaulum x S. hysterix hybrids, and back-crossing onto both A. trachucaulum and S. hysterix is common. Sterile backcross derivatives, (A. trachycaulum x S. hysterix) x S. hysterix, were found which possess characters similar to A. scribneri and which phenotypically resemble A. scribneri. These are considered to be stabilized hybrid segregants which indicate that the incipient formation of A. scribneri is in progress.

Thesis (Ph. D.)--Oregon State University, 2010. / Printout. Includes bibliographical references (leaves 275-310). Also available on the World Wide Web.

Thesis (M. Sc.)--University of Alberta, 2010. / Title from pdf file main screen (viewed on Jan. 22, 2010). A thesis submitted to the Faculty of Graduate Studies and Research in partial fulfillment of the requirements for the degree of Master of Science in Ecology, Department of Biological Sciences, University of Alberta. Includes bibliographical references.

Diploma thesis--Anthropological Institute and Museum, University of Zürich, 2004. / "2004"--title page. Title from initial PDF page image (viewed October 5, 2006). Includes bibliographical references (p. 59-63).

Please read the abstract in the dissertation. / Dissertation (MEng)--University of Pretoria, 2013. / gm2014 / Civil Engineering / Unrestricted

Current revegetation practices in the lntermountain West include the use of Nordan (Agropyron desertorum) and Hycrest (A. cristatum x desertorum) crested wheatgrass on rangeland susceptible to cheatgrass (Bromus tectorum) invasion, although little quantitative data exists that compares their competitive abilities. We evaluated both the competitive ability of Hycrest and Nordan in two-species mixtures with cheatgrass, and evaluated seedling establishment characteristics for all three species in a greenhouse study. Linear and nonlinear models were developed for a range of densities for each species to predict median above-ground biomass and tiller numbers. In both experiments, increasing Hycrest and Nordan densities reduced their own biomass and tiller production while cheatgrass biomass and tiller production was not influenced. However, increasing cheatgrass densities reduced both Hycrest and Nordan biomass and tiller production, as well as its own biomass and tiller production. Examination of trends in competition indices, such as relative resources totals, substitution rates and perceived densities indicated that as seedlings, Hycrest was a better competitor with cheatgrass than Nordan at lower crested wheatgrass densities (130 plants/m2 ). Results from this experiment indicate that Hycrest is a better competitor than Nordan with cheatgrass and suggest that seeding Hycrest at lower densities than currently recommended may optimize its seedling growth when competing with cheatgrass. Future research concerning competition in these species using similar designs should focus on competition in successive years after establishment and on field experiments to verify these results.

京都大学 / 0048 / 新制・論文博士 / 博士(農学) / 乙第13020号 / 論農博第2830号 / 新制||農||1042(附属図書館) / 学位論文||H28||N4966(農学部図書室) / 32948 / (主査)教授 祝前 博明, 教授 今井 裕, 教授 廣岡 博之 / 学位規則第4条第2項該当 / Doctor of Agricultural Science / Kyoto University / DFAM

Double-crested Cormorants (Phalacrocorax auritus) impact United States commercial aquaculture and are considered the greatest avian predators on catfish (Ictalurus spp.) aquaculture facilities in the Mississippi Delta. Recent changes in aquaculture practices, regulatory policies, and decreased overall hectares in production prompted this study that: 1) estimated abundance and distribution of cormorants at their night roosts using aerial surveys, 2) assessed cormorant consumption of catfish in relation to their night roost through cormorant collections and stomach contents analysis, and 3) updated a cormorant bioenergetics model with contemporary data to estimate catfish loss. Models estimated that 4.2 and 5 million cormorant forage days occurred during winters 2016-2018 with an average of 33% of their diet consisting of catfish, or 558.1 and 739.5 metric tons of catfish consumed by cormorants in winters 2016-2018. These results will inform wildlife managers about relationships between cormorant night roost locations and disproportionate consumption of catfish.