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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
11

相關變數之隨機修剪L : 統計量之漸近性 / On the asymptotic behavior of randomly trimmed L-statistics with dependent random variables

陳宗雄 Unknown Date (has links)
摘要 本文主要在探討絕對正則隨機變數序列的隨機修剪L統計量的漸近性,當修剪係系數收斂至a和b時(O<a<b<l),對它們的分配函數限制並不多;然而當a=0及b=1 時,則限制的條件須更加嚴格,這也就是為什麼我們要做隨機修剪的主要原因。同時,由於大部分的時間序列模式都是絕對正則的隨機變數序列,這也是研究本文的主要動機之一。 本文是想嘗試著把G. R. Shorack (1989)的論文隨機修剪L統計量,推廣,把該文中立相獨立的隨機變數序列換成絕對正則的隨機變數序列。在這同時,我們必需將一些經驗累積分配函數的不等式推廣,推廣過程中將重覆使用Yoshihara (1978) 的機率不等式。 / ABSTRACT We will prove central limit theorem for randomly trimmed L-statistics with absolutely regular random variables. When the fractions trimmed converge to a and l-b, (with 0<a<b<l) there are little restrictions on the df's of the r.v.'s, - but the limiting r.v. has several contributing terms, making the studentization complicated unless the trimming fractions converge fast enough. For a=0 and b=l, the restriction on the rate of convergence of the trimming fractions is more severe, however this is a most reasonable way to trim.
12

Logical and sheaf theoretic methods in the study of geometric fields in sheaf toposes over Boolean spaces and applications to Von Neumann regular rings

MacCaull, Wendy Alwilda. January 1984 (has links)
No description available.
13

Modeling and understanding of directional friction on a fully lubricated surface with regular anisotropic asperities

Zhang, Zhiming 16 September 2010
Traditional tribology is based on the surface with random micro structures due to limitations of manufacturing technology. The modern manufacturing technology now promises to fabricate surfaces with regular micro structures (or asperities). The word asperity refers to a single physical entity on the surface of a material, contributing to a concept called roughness in traditional tribology. Regular asperity surfaces imply that all asperities on the surface of a material have the same shape and size, and a deterministic distribution over the surface. The emergence of regular asperity surfaces will have a transformative impact to the discipline of tribology.<p> The overall objective of this thesis is to study how the regular asperity would affect the tribological behavior. Specifically, this thesis develops a computational model to demonstrate and characterize the effect of the surface with regular anisotropic asperities (RAA) on the directional friction behavior when the surface is in a fully lubricated state. By directional friction, it is meant that friction force changes its magnitude with the change of the relative motion direction. By anisotropic asperity, it is meant that the geometry of the asperity is not symmetrical along the motion direction.<p> This thesis presents a detailed development of the computational model by employing computational fluid dynamics (CFD) techniques. In particular, the model takes the Navier-Stokes (NS) equation as a governing equation and the Half-Sommerfeld Condition (HSC) to represent fluid behavior in the cavitation region; as such the model is named NS-HSC for short. Verification of the NS-HSC model is conducted with the information available in literature. A theory is proposed to explain the relationship between directional friction behavior and specific RAA structures. The thesis concludes: (1) the NS-HSC model is more accurate than the existing model in the literature and can be used to predict directional friction behavior and to design RAA surfaces, and (2) the proposed theory is excellent consistent with the NS-HSC model and thus useful to analysis and design of RAA surfaces for directional friction.<p> The major contributions of this thesis are: (1) the first model in the field of tribology to predict the directional friction behavior for RAA surfaces under a fully lubricated status, (2) the first investigation, in the field of CFD, into combining the NS and HSC for modeling a laminar flow with cavitation, and (3) the first theory in the field of tribology for directional friction on fully lubricated RAA surfaces.
14

Simulators for formal languages, automata and theory of computation with focus on JFLAP

Fransson, Tobias January 2013 (has links)
This report discusses simulators in automata theory and which one should be best for use in laboratory assignments. Currently, the Formal Languages, Automata and Theory of Computation course (FABER) at Mälardalen University uses the JFLAP simulator for extra exercises. To see if any other simulators would be useful either along with JFLAP or standalone, tests were made with nine programs that are able to graphically simulate automata and formal languages. This thesis work started by making an overview of simulators currently available.After the reviews it has become clear to the author that JFLAP is the best choice for majority of cases. JFLAP is also the most popular simulator in automata theory courses worldwide.To support the use of JFLAP for the course a manual and course assignments are created to help the student to getting started with JFLAP. The assignments are expected to replace the current material in the FABER course and to help the uninitiated user to get more out of JFLAP.
15

Modeling and understanding of directional friction on a fully lubricated surface with regular anisotropic asperities

Zhang, Zhiming 16 September 2010 (has links)
Traditional tribology is based on the surface with random micro structures due to limitations of manufacturing technology. The modern manufacturing technology now promises to fabricate surfaces with regular micro structures (or asperities). The word asperity refers to a single physical entity on the surface of a material, contributing to a concept called roughness in traditional tribology. Regular asperity surfaces imply that all asperities on the surface of a material have the same shape and size, and a deterministic distribution over the surface. The emergence of regular asperity surfaces will have a transformative impact to the discipline of tribology.<p> The overall objective of this thesis is to study how the regular asperity would affect the tribological behavior. Specifically, this thesis develops a computational model to demonstrate and characterize the effect of the surface with regular anisotropic asperities (RAA) on the directional friction behavior when the surface is in a fully lubricated state. By directional friction, it is meant that friction force changes its magnitude with the change of the relative motion direction. By anisotropic asperity, it is meant that the geometry of the asperity is not symmetrical along the motion direction.<p> This thesis presents a detailed development of the computational model by employing computational fluid dynamics (CFD) techniques. In particular, the model takes the Navier-Stokes (NS) equation as a governing equation and the Half-Sommerfeld Condition (HSC) to represent fluid behavior in the cavitation region; as such the model is named NS-HSC for short. Verification of the NS-HSC model is conducted with the information available in literature. A theory is proposed to explain the relationship between directional friction behavior and specific RAA structures. The thesis concludes: (1) the NS-HSC model is more accurate than the existing model in the literature and can be used to predict directional friction behavior and to design RAA surfaces, and (2) the proposed theory is excellent consistent with the NS-HSC model and thus useful to analysis and design of RAA surfaces for directional friction.<p> The major contributions of this thesis are: (1) the first model in the field of tribology to predict the directional friction behavior for RAA surfaces under a fully lubricated status, (2) the first investigation, in the field of CFD, into combining the NS and HSC for modeling a laminar flow with cavitation, and (3) the first theory in the field of tribology for directional friction on fully lubricated RAA surfaces.
16

The Differences of Training in Diverse Real Estate Chain System

Tung, Yu-Shi 26 January 2008 (has links)
The primary research focuses on the differences of training in diverse real estate chain system. It takes case study and analyzes data of training courses from three famous real estate agency in Taiwan; using half-structural formula questionnaire for interview. According to five aspects, external environment, regular chain headquarters, franchise chain headquarters, franchisee and brokers; it points seven main factors which influence the training from different system. The similarities and dissimilarities are as below: 1.Regular chain focuses training on human resource investment, but franchise chain takes it as a supply for franchisee of practical training source. 2.The budget of training of regular chain comes from the headquarters, whereas the franchise chain comes from monthly expense. 3.The training courses of regular chain are constant and compulsory; also bounding with promotion. The courses of franchise chain are free, optional and with no promotion. 4.Both of them use their own interior sources to training. 5.The recruitment requirements between regular and franchise chain are different. Regular chain has average quality of a broker, but the diversity of franchise chain is various. 6.Regular and franchise chain provide training sessions for new employees regularly. 7.The courses held in headquarters cannot completely satisfy franchise chain stores¡¦ need.
17

General education teachers’ perceptions of inclusion of students with disabilities in the regular classroom

Stidham-Smith, Sharon Ruth 18 September 2013 (has links)
General Education Teachers' Perceptions of Inclusion of Students with Disabilities in the Regular Classroom Sharon Ruth Stidham-Smith, Ph.D. The University of Texas at Austin, 2013 Supervisor: James L. Schaller This exploratory descriptive study was conducted to examine the perceptions of general public school teachers regarding inclusion of students with disabilities in their classroom. Instruments used to measure the concepts studied include an Inclusion Inventory followed by additional open-ended questions. A sample of general education public school teachers, who have had a child with a disability in their classroom, was recruited from a Texas regional school district. The research questions asked about the teachers' educational teams, their grade level assignment, and the number of years taught; followed by open ended questions that included the participants' definition of inclusion, their experiences and challenges, training in inclusion, and the concept of the general education teacher having sole responsibility for all the students in the class. Inclusion teams were found to be an important aspect of this study. The participants reported the success (or lack of success) of their inclusive classroom often depended on their inclusion team. In particular, special education coordination with vii administration support in finding solutions for unacceptable classroom behavior, time management, and class size. Many respondents felt further preservice and inservice training on how this support can be accomplished that includes administration as well as general and special education teachers was one avenue that could help realize an inclusive classroom that was beneficial to all. What exactly would be emphasized in this inclusion training was not stated. The inclusive practices and strategies discussed in this study require further research in order to determine what could be called a 'best practice' in the inclusive classroom. / text
18

Logical and sheaf theoretic methods in the study of geometric fields in sheaf toposes over Boolean spaces and applications to Von Neumann regular rings

MacCaull, Wendy Alwilda. January 1984 (has links)
We investigate some properties of (geometric) fields in toposes of sheaves over Boolean spaces and establish the internal validity of a number of classical theorems from Algebraic Geometry and the theory of ordered fields. We then use our results to obtain, via sheaf representations, some know theorems about (von Neumann) regular rings as well as some new theorems for regular f-rings. By contrast with previous investigations in these last two subjects (Saracino and Weispfenning {39} and van den Dries {42}) a more natural approach, inspired by work of Macintyre {30}, Loullis {29}, Bunge-Reyes {7} and Bunge {4},{5} is employed here. In addition to sheaf theoretic methods we use a variety of logical methods from geometric logic, infinitary intuitionistic logic and model theory. We also prove some new theorems on the transfer of subobjects along certain morphisms and a "lifting theorem" taking truth from statements about global sections to their internal validity.
19

Estudar e/ou trabalhar: ser aluno-trabalhador é possível?

Hickmann, Roseli Inês January 1992 (has links)
A presente dissertação relata as principais análises e conclusões referentes a uma pesquisa realizada numa escola pública de 1º grau - ensino regular noturno de 5ª a 8ª série, onde se priorizaram e se privilegiaram como sujeitos do estudo os alunos-trabalhadores. Através de depoimentos e entrevistas com alunos-trabalhadores do ensino noturno, foi possível captar e aproximar-se um pouco mais das representações que os mesmos tem do cotidiano escolar e do mundo do trabalho. O referido estudo, também preocupou-se em compreender o significado que a escola tem para estes alunos-trabalhadores que a freqüentam, e para àqueles que ela retornam, após experiências de desistência e exclusão, mergulhados nesse movimento de ora se estuda e ora se trabalha.Neste ir e vir do cotidiano escolar e do mundo do trabalho, é dado ênfase ao trabalho como elemento predominante no processo de exclusão destes alunos-trabalhadores da escola noturna, porém, salienta-se que a escola também contribui, na medida em que com suas práticas diárias, dentro e fora do espaço da sala de aula, ignora e desconhece o trabalhador que cada aluno é. Escola e trabalho configuram-se, pois, como experiências excludentes nas trajetórias de vida destes alunos-trabalhadores.
20

Avaliação de dados de grades regulares para fins estatísticos

Yamaguchi, Fernando Yutaka 24 March 2017 (has links)
Submitted by Pós graduação Engenharia Civil (ppec@ufba.br) on 2017-08-11T17:05:10Z No. of bitstreams: 1 Dissertação_Fernando_Yamaguchi_2017.pdf: 14834453 bytes, checksum: 9e9b2850797caff2fd1c1ef8b27629e2 (MD5) / Approved for entry into archive by Vanessa Reis (vanessa.jamile@ufba.br) on 2017-08-18T15:40:56Z (GMT) No. of bitstreams: 1 Dissertação_Fernando_Yamaguchi_2017.pdf: 14834453 bytes, checksum: 9e9b2850797caff2fd1c1ef8b27629e2 (MD5) / Made available in DSpace on 2017-08-18T15:40:56Z (GMT). No. of bitstreams: 1 Dissertação_Fernando_Yamaguchi_2017.pdf: 14834453 bytes, checksum: 9e9b2850797caff2fd1c1ef8b27629e2 (MD5) / A proposta desta dissertação é demonstrar as vantagens e as desvantagens da representação de dados espaciais por grades regulares. A principal motivação é harmonizar os dados geológicos, climáticos, uso da terra e socioeconômicos, entre outros, sendo consistente no espaço e no tempo, dando suporte para as análises multitemporais, permitindo agregar os dados em recortes específicos, por exemplo, em uma bacia, além de ser um suporte organizado para a modelagem dinâmica. Em outubro de 2015, o Instituto Brasileiro de Geografia e Estatística, IBGE, liberou uma grade para fins estatísticos com dados de população, sexo e número de domicílios do ano de 2010, demonstrando a necessidade de novo modelo de divulgação de dados socioeconômicos. Para justificar o escopo deste trabalho foi avaliada a mutabilidade entre os setores censitários de 2000 e 2010 do IBGE, levantando as diferenças entre os censos decenais. Foram desenvolvidos trabalhos para avaliar a potencialidade da grade nos setores de transporte, riscos no transporte de produtos perigosos e vulnerabilidades às suscetibilidades de inundação e movimento de massa. Com o objetivo de validar dados pretéritos foi avaliado um conjunto de interpolações dos setores censitários tendo a grade como verdade e sendo que a interpolação por krigagem mostrou o melhor desempenho geral.

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