467 research outputs found

    The War Against Chinese Restaurants

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    Chinese restaurants are a cultural fixture—as American as cherry pie. Startlingly, however, there was once a national movement to eliminate Chinese restaurants, using innovative legal methods to drive them out. Chinese restaurants were objectionable for two reasons. First, Chinese restaurants competed with “American” restaurants, thus threatening the livelihoods of white owners, cooks, and servers and motivating unions to fight them. Second, Chinese restaurants threatened white women, who were subject to seduction by Chinese men taking advantage of intrinsic female weakness and nefarious techniques such as opium addiction. The efforts were creative. Chicago used anti-Chinese zoning, Los Angeles restricted restaurant jobs to citizens, Boston authorities denied Chinese restaurants licenses, and the New York Police Department simply ordered whites out of Chinatown. Perhaps the most interesting technique was a law, endorsed by the American Federation of Labor for adoption in all jurisdictions, prohibiting white women from working in Asian restaurants. Most measures failed or were struck down. The unions, of course, did not eliminate Chinese restaurants, but Asians still lost because unions achieved their more important goal by extending the federal immigration policy of excluding Chinese immigrants to all Asian immigrants. The campaign is of more than historical interest today. As current anti-immigration sentiments and efforts show, even now the idea that white Americans should have a privileged place in the economy, or that nonwhites are culturally incongruous, persists among some

    Fermion Resonances in Quiver Theories with a pNGB Higgs

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    Hierarchical quiver models can be used to build theories of electroweak symmetry breaking and natural models of flavor with a pseudo--Nambu-Goldstone boson (pNGB) Higgs. They are cousins of similar models in extra-dimensional theories in anti--de Sitter backgrounds, and can be obtained from them by coarse deconstruction. We consider the fermion excitations in these models, focusing on the quark sector and studying its generic features and phenomenology. We show that, unlike in the continuum case, the spectrum is strongly flavor dependent. To study the phenomenology of the quark excitations we compute their couplings to the Higgs sector and the gauge excitations which determine both their single-production and their decays. We show how the generic features of quiver theories with a pNGB Higgs translate, through the spectrum of quark excitations and their couplings, into a distinct phenomenology at the LHC.Comment: 21 pages, 11 figure

    A FLOW-THROUGH ACOUSTIC WAVEGUIDE FOR TWO-PHASE BUBBLY FLOW VOID FRACTION MEASUREMENT

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    In the Spallation Neutron Source (SNS) facility at Oak Ridge National Laboratory (ORNL), the deposition of a high-energy proton beam into the liquid mercury target forms bubbles whose asymmetric collapse cause Cavitation Damage Erosion (CDE) to the container walls, thereby reducing its usable lifetime. One proposed solution for mitigation of this damage is to inject a population of microbubbles into the mercury, yielding a compliant and attenuative medium that will reduce the resulting cavitation damage. This potential solution presents the task of creating a diagnostic tool to monitor bubble population in the mercury flow in order to correlate void fraction and damage. Details of an acoustic waveguide for the eventual measurement of two-phase mercury-helium flow void fraction are discussed. The assembly’s waveguide is a vertically oriented stainless steel cylinder with 5.08cm ID, 1.27cm wall thickness and 40cm length. For water experiments, a 2.54cm thick stainless steel plate at the bottom supports the fluid, provides an acoustically rigid boundary condition, and is the mounting point for a hydrophone. A port near the bottom is the inlet for the fluid of interest. A spillover reservoir welded to the upper portion of the main tube allows for a flow-through design, yielding a pressure release top boundary condition for the waveguide. A cover on the reservoir supports an electrodynamic shaker that is driven by linear frequency sweeps to excite the tube. The hydrophone captures the frequency response of the waveguide. The sound speed of the flowing medium is calculated, assuming a linear dependence of axial mode number on modal frequency (plane wave). Assuming that the medium has an effective-mixture sound speed, and that it contains bubbles which are much smaller than the resonance radii at the highest frequency of interest (Wood’s limit), the void fraction of the flow is calculated. Results for water and bubbly water of varying void fraction are presented, and serve to demonstrate the accuracy and precision of the apparatus.Supported by the ORNL Spallation Neutron Source, which is managed by UT- Battelle, LLC, under contract DE-AC05-00OR22725 for the U.S. Department of Energy

    Soil Science Lesson Plan for the Cal Poly Learn By Doing Lab

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    To increase interest in soil science and other related sciences, educational materials need to be tailored to appeal to younger students. The purpose of this project was to create a soil science lesson plan that could be utilized by the Cal Poly Learn By Doing Lab. Information from several articles, textbooks, lesson plans, and websites was reviewed to create a soil science lesson plan for students in 5-8th grade. The lesson plan focused on the three sub-disciplines of soil science; physical, chemical, and biological. Activities were created to correspond to the three sub-disciplines. Alternate activities were created to allow for substitutions. The concluding activity incorporated the three sub-disciplines by discussing the important processes soil provides for life on earth. The lesson plan was written to be educational, but also entertaining for students and teachers

    O género Ceterach Willd. nas ilhas Macaronésicas

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    Estudou-se o comprimento e a morfologia dos esporos do taxa do género Ceteracb (Aspleniaceae, Pteridophytaï das Ilhas Macaronésicas. As diferenças encontradas, quer no comprimento, quer na ornamentaçào do perisporo permitem distinguir os três taxa macaronésicos: C. aureum var. aureum, C. aureum var. madeirense eC. aureum var. parvifolium. Com estes resultados e os obtidos em estudos citogenéticos, efectuados por outros autores, estabeleceram-se possíveis relaçêes gen6micas entre os diferentes taxa do género Ceteracb da Eurásia e Ilhas Macaronésicas.Spore lengh and spore morphology of the Macaronesian taxa of genus Ceterach Willd. (Aspleniaceae, Pteridophytaï have been studied. Differences in spore lengh and spore morphology may be used to distinguish the three taxa: C. aureum var. aureum, C. aureum var madeirense and C. aureum var. parvifolium. With those results and with the results of earliest cytological studies, it was state the genomic relationships between the different taxa of genus Ceterach from Eurasia and Macaronesian Islands

    Ledger and account book Ormond Plantation. 1853

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    This item has been aggregated as part of the Association of Southeastern Research Libraries (ASERL)\u27s Deeply Rooted: The Agricultural & Rural History of the American South project.https://egrove.olemiss.edu/deeplyrooted/1121/thumbnail.jp

    Previsão da produção de carne vendável e do rendimento das diferentes peças de corte de carcaças de bovino com base na sua classificação SEUROP

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    Dissertação de Mestrado, Engenharia Zootécnica, 11 de Junho de 2014, Universidade dos Açores.Os sistemas de classificação de carcaças de bovinos, bem como os de outras espécies pecuárias, surgiram com o objectivo de disponibilizar ao circuito comercial uma avaliação da qualidade das carcaças que servisse de referência para sua valorização técnica e económica. Contudo, estes diversos sistemas, incluindo o sistema comunitário (SEUROP), são bastante subjetivos visto se basearem num conjunto de critérios que o classificador tem que avaliar recorrendo apenas à observação da carcaça. No caso do sistema SEUROP (alvo deste estudo) é feita uma avaliação da conformação e do grau de cobertura de gordura da carcaça sendo assumido que carcaças melhor conformadas e com uma razoável cobertura de gordura produzem maior proporção de peças de superior qualidade. Porém, a existência dessa relação, bem como a forma como se manifesta, não tem sido estabelecida com fundamentação científica de forma satisfatória. Assim, este estudo teve por objectivo detectar relações entre os critérios de classificação SEUROP e o rendimento na desmancha das diversas peças de corte de bovino. […].ABSTRACT: The classification systems of carcasses of bovine animals, as well as those of other livestock species, emerged with the aim of providing the commercial circuit an evaluation of the quality of castings to serve as a reference for your technical and economic valuation. However, these various systems, including the Community system (SEUROP), are rather subjective seen are based on a set of criteria that the classifier has to assess using only the observation of housing. In the case of the SEUROP system (this study) is made an evaluation of conformation and the degree of fat cover of the carcass being assumed that carcasses better shaped and with a reasonable coverage of fat produce higher proportion of superior quality parts. However, the existence of that relationship, as well as the way it manifests itself, has not been established with scientific basis in a satisfactory manner. Thus, this study aimed to detect relationship between SEUROP classification criteria and yield on cutting of various pieces of beef cut. […]

    Design and implementation of a modular scheduling simulator for aerospace applications

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    Tese de mestrado em Engenharia Informática, apresentada à Universidade de Lisboa, através da Faculdade de Ciências, 2012Sistemas tempo-real têm de produzir os resultados esperados de cada tarefa atempadamente de acordo com a urgência de cada uma. Desde os anos 70 tentam-se obter formas de coordenar a execução das tarefas para cumprir todos os prazos através de algoritmos de escalonamento. Na sua maioria estes algoritmos apesar de terem requerido um extensivo trabalho por parte de quem os criou são simples de compreender. Um dos mais antigos é o algoritmo “Earliest Deadline First”, que consiste em dar maior prioridade às tarefas mais urgentes. Alguns sistemas devido às suas características particulares obedecem a modelos mais complexos. É o caso dos sistemas aeronáuticos onde é necessário manter o isolamento entre as funcionalidades. As funções são agrupadas logicamente em contentores denominados partições. Para garantir essa separação no domínio do tempo introduz-se um esquema de escalonamento a dois níveis. Um primeiro que determina as janelas temporais a dar a cada partição e um segundo nível onde estão as partições e respectivas funções. Os algoritmos de escalonamento utilizados em cada nível não tem de ser iguais; no segundo nível, cada partição pode usar um algoritmo diferente. Após estudar o que actualmente existe decidimos orientar o nosso trabalho para partições e escalonamento hierárquico pois é de onde poderemos vir a obter melhores resultados e soluções para sistemas futuros. Fazendo uso de padrões de desenho, bem como características do Java, tais como herança e polimorfismo conseguimos obter uma solução que após implementada permite aos seus utilizadores simularem a execução de um sistema que estes definam. Permite também obter os eventos e com estes mostrar ao utilizador o que o simulador fez em cada momento do sistema podendo estes resultados ser exibidos em formato textual ou fazer uso de outras aplicações de visualização de resultados.Real-time systems are required to produce results from each task in time, according to the urgency of each one. Since the 1970s researchers try to obtain ways to coordinate the execution of tasks to meet all deadline, by using scheduling algorithms. Although the majority of these algorithms required an extensive work from those who created them, they are simple to understand. One of the oldest is the Earliest Deadline First algorithm, which attributes higher priority to the most urgent tasks. Due to their characteristics, some systems obey to more complex models; this is the case of aerospace systems. These systems require full isolation between functionalities. The functions, composed of tasks (processes), are logically grouped into partitions. To ensure separation in the time domain, a two level scheduling scheme is introduced. The first level determinates the time windows to assign to each partition; in the second level, tasks in each partition compete among them for the execution time assigned to the latter. The scheduling algorithms used in each level do not need to be the same; in the second level, each partition may even employ a different algorithm to schedule its tasks. After studying what currently exists we have decided to guide our work to partitions and hierarchical scheduling because it is where we see producing better results and solutions for future systems. Using design patterns as well as Java properties such as inheritance and polymorphism we were able to obtain a solution that after implemented allows users to simulate the execution of a system defined by them. The tool allows obtaining events and showing them to the user and giving feedback, these events represent the basic functionalities of a real-time system, such as, job launch and job deadline miss and others. These results can be shown in textual form or use other applications of results visualization
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