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Добірка наукової літератури з теми "CPMA"

Автор: Grafiati

Опубліковано: 11 вересня 2023

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Статті в журналах з теми "CPMA"

Song, Yao, Xiangyu Pei, Huichao Liu, Jiajia Zhou, and Zhibin Wang. "Characterization of tandem aerosol classifiers for selecting particles: implication for eliminating the multiple charging effect." Atmospheric Measurement Techniques 15, no. 11 (June 14, 2022): 3513–26. http://dx.doi.org/10.5194/amt-15-3513-2022.

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Abstract. Accurate particle classification plays a vital role in aerosol studies. Differential mobility analyzers (DMAs), centrifugal particle mass analyzers (CPMAs) and aerodynamic aerosol classifiers (AACs) are commonly used to select particles with a specific mobility diameter, aerodynamic diameter or mass, respectively. However, multiple charging effects cannot be entirely avoided when using either individual techniques or tandem systems such as DMA–CPMA, especially when selecting soot particles with fractal structures. In this study, we calculate the transfer functions of the DMA–CPMA and DMA–AAC in static configurations for flame-generated soot particles. We propose an equation that constrains the resolutions of the DMA and CPMA to eliminate the multiple charging effect when selecting particles with a certain mass–mobility relationship using the DMA–CPMA system. The equation for the DMA–AAC system is also derived. For DMA–CPMA in a static configuration, our results show that the ability to remove multiply charged particles mainly depends on the particle morphology and resolution settings of the DMA and CPMA. Using measurements from soot experiments and literature data, a general trend in the appearance of the multiple charging effect with decreasing size when selecting aspherical particles is observed. As for DMA–AAC in a static configuration, the ability to eliminate particles with multiple charges is mainly related to the resolutions of the classifiers. In most cases, the DMA–AAC in a static configuration can eliminate the multiple charging effect regardless of the particle morphology, but multiply charged particles will be selected when decreasing the resolution of the DMA or AAC. We propose that the potential influence of the multiple charging effect should be considered when using the DMA–CPMA or DMA–AAC systems in estimating size- and mass-resolved optical properties in field and lab experiments.

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MATSUMOTO, TETSUYA, KAZUHITO HAGIO, and MASAYUKI TAKEDA. "A RUN-TIME EFFICIENT IMPLEMENTATION OF COMPRESSED PATTERN MATCHING AUTOMATA." International Journal of Foundations of Computer Science 20, no. 04 (August 2009): 717–33. http://dx.doi.org/10.1142/s0129054109006838.

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We present a run-time efficient implementation of compressed pattern matching automata (CPMA) of Kida et al. (2003), where a text is given as a truncation-free collage system [Formula: see text] such that variable sequence [Formula: see text] is encoded by any prefix code. We first build CPMA directly from P and [Formula: see text] in [Formula: see text] time and space, and then convert it into the decoder-embedded CPMA (DECPMA), where |P| is the pattern length and [Formula: see text] is the number of variables defined in [Formula: see text]. The bound [Formula: see text] improves the bound [Formula: see text] achieved by a straightforward application of the method of Kida et al. We experimentally show that a combination of recursive-pairing compression and byte-oriented Huffman coding allows both a high compression ratio and a high speed CPM.

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Lee, Doojin. "Metasurface cloaks for decoupling electromagnetic interference within highly dense areas." AIP Advances 13, no. 4 (April 1, 2023): 045111. http://dx.doi.org/10.1063/5.0141212.

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This paper presents the results of intensive investigations of electromagnetic interference caused primarily by closely arranged antennas within subwavelength distance; potential applications involve the principle of scattering cancellation. A cloaked planar monopole antenna (CPMA) is newly proposed in this work. The performance of the CPMA is compared with that of a bare planar monopole antenna. Numerical simulations with the two antenna types were conducted, and various configurations with the potential for practical applications in the industrial and defense sectors were tested.

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Wang, Zhongbao, and Shaojun Fang. "ANN Synthesis Model of Single-Feed Corner-Truncated Circularly Polarized Microstrip Antenna with an Air Gap for Wideband Applications." International Journal of Antennas and Propagation 2014 (2014): 1–7. http://dx.doi.org/10.1155/2014/392843.

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A computer-aided design model based on the artificial neural network (ANN) is proposed to directly obtain patch physical dimensions of the single-feed corner-truncated circularly polarized microstrip antenna (CPMA) with an air gap for wideband applications. To take account of the effect of the air gap, an equivalent relative permittivity is introduced and adopted to calculate the resonant frequency andQ-factor of square microstrip antennas for obtaining the training data sets. ANN architectures using multilayered perceptrons (MLPs) and radial basis function networks (RBFNs) are compared. Also, six learning algorithms are used to train the MLPs for comparison. It is found that MLPs trained with the Levenberg-Marquardt (LM) algorithm are better than RBFNs for the synthesis of the CPMA. An accurate model is achieved by using an MLP with three hidden layers. The model is validated by the electromagnetic simulation and measurements. It is enormously useful to antenna engineers for facilitating the design of the single-feed CPMA with an air gap.

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Ma, Yong Sheng, Yun Fa Chen, Xian Hui Sun, Chuan Jun Zhao, and Shou Jie Nie. "Application Study of Cationic Polymethyl Acrylate Emulsion as Papermaking Sizing Agent." Advanced Materials Research 479-481 (February 2012): 504–7. http://dx.doi.org/10.4028/www.scientific.net/amr.479-481.504.

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The cationic polymethyl acrylate (CPMA) emulsion which was prepared with no soap emulsion polymerization was used with petroleum resin sizing agent in bleached wheat straw pulp and wood pulp as papermaking sizing agent. It was showed that by the experimental results that when the dosage of composite sizing agent composed of CPMA emulsion and anionic petroleum resin sizing agent was 0.2% absolute dry pulp, sizing degree and white degree of handsheet made of bleached wheat straw pulp were improved 33% and 5.2%ISO respectively. It was also showed that when the dosage of composite sizing agent was 0.2% absolute dry pulp, sizing degree and white degree of handsheet made of wood pulp were improved 37% and 4.2%ISO respectively.

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Lavieri, Frank P. "Review of the 1993 ISCC/CPMA conference." Color Research & Application 18, no. 6 (December 1993): 432–34. http://dx.doi.org/10.1002/col.5080180614.

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Dvornyk, Volodymyr. "Subfamilies of cpmA, a gene involved in circadian output, have different evolutionary histories in cyanobacteria." Microbiology 152, no. 1 (January 1, 2006): 75–84. http://dx.doi.org/10.1099/mic.0.28400-0.

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The cpmA gene mediates an output signal in the cyanobacterial circadian system. This gene and its homologues are evolutionarily old, and occur in some non-photosynthetic bacteria and archaea as well as in cyanobacteria. The gene has two functional domains that differ drastically in their level of polymorphism: the N-terminal domain is much more variable than the PurE homologous C-terminal domain. The phylogenetic tree of the cpmA homologues features four main clades (C1–C4), two of which (C1 and C3) belong to cyanobacteria. These cyanobacterial clades match respective ones in the previously reported phylogenetic trees of the other genes involved in the circadian system. The phylogenetic analysis suggested that the C3 subfamily, which comprises the genes from the cyanobacteria with the kaiBC-based circadian system, experienced a lateral transfer, probably from evolutionarily old proteobacteria about 1000 million years ago. The genes of this subfamily have a significantly higher nonsynonymous substitution rate than those of C1 (2·13×10−10 and 1·53×10−10 substitutions per nonsynonymous site per year, respectively). It appears that the functional and selective constraints of the kaiABC-based system have slowed down the rate of sequence evolution compared to the cpmA homologues of the kaiBC-based system. On the other hand, the differences in the mutation rates between the two cyanobacterial clades point to the different functional constraints of the systems with or without kaiA.

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Derzelle, Sylviane, Eric Duchaud, Frank Kunst, Antoine Danchin, and Philippe Bertin. "Identification, Characterization, and Regulation of a Cluster of Genes Involved in Carbapenem Biosynthesis in Photorhabdus luminescens." Applied and Environmental Microbiology 68, no. 8 (August 2002): 3780–89. http://dx.doi.org/10.1128/aem.68.8.3780-3789.2002.

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ABSTRACT The luminescent entomopathogenic bacterium Photorhabdus luminescens produces several yet-uncharacterized broad-spectrum antibiotics. We report the identification and characterization of a cluster of eight genes (named cpmA to cpmH) responsible for the production of a carbapenem-like antibiotic in strain TT01 of P. luminescens. The cpm cluster differs in several crucial aspects from other car operons. The level of cpm mRNA peaks during exponential phase and is regulated by a Rap/Hor homolog identified in the P. luminescens genome. Marker-exchange mutagenesis of this gene in the entomopathogen decreased antibiotic production. The luxS-like signaling mechanism of quorum sensing also plays a role in the regulation of the cpm operon. Indeed, luxS, which is involved in the production of a newly identified autoinducer, is responsible for repression of cpm gene expression at the end of the exponential growth phase. The importance of this carbapenem production in the ecology of P. luminescens is discussed.

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Damle, Priyadarshan K., Erin A. Wall, Michael S. Spilman, Altaira D. Dearborn, Geeta Ram, Richard P. Novick, Terje Dokland, and Gail E. Christie. "The roles of SaPI1 proteins gp7 (CpmA) and gp6 (CpmB) in capsid size determination and helper phage interference." Virology 432, no. 2 (October 2012): 277–82. http://dx.doi.org/10.1016/j.virol.2012.05.026.

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Symonds, Jonathan P. R., Kingsley St J. Reavell, and Jason S. Olfert. "The CPMA-Electrometer System—A Suspended Particle Mass Concentration Standard." Aerosol Science and Technology 47, no. 8 (August 2013): i—iv. http://dx.doi.org/10.1080/02786826.2013.801547.

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Більше джерел

Дисертації з теми "CPMA"

Coelho, Araci Rodrigues. "Usos do livro didático de História: entre prescrições e táticas." Universidade Federal de Minas Gerais, 2009. http://hdl.handle.net/1843/CPSA-7WLMZV.

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The object of this research are the uses that the teachers of the Fundamental Teaching / Ensino Fundamental first segment say to be doing of the History didactic book most issued by the PNLD 2004: História com Reflexão / History with Reflection (Coleção Horizontes ). Such an object is inserted in the crossing of two study fields: that of History Teaching and that of the the Didactic Book. Owing to the object complexity, we have adopted the theoretical-methodological perspective that joins the qualitative researches presuppositions and procedures, in dialogue with other fields, mainly those from the Sociology of Education and from the History of Education and, specifically, that of the History of the book and that of the Reading Practices. Upon this analytical perspective, taking into account the criticism to the didactic books analysis that starting in the 1980s reveal the ideology conveyed by those books, in special those of History or Social Studies, which do not take into account the knowledge mobilized in those supports, neither the subjects and contexts involved in their teaching and learning. We have investigated specifically the uses of this book distributed by the PNLD, by 4th and 5th grade school teachers, in order to describe and analyze the informed uses of this book, seeking to know their experiences with this didactic materials and the meaning they created in their teaching practices. Once outlined the personal and professional conditions of the teachers under research, it was possible to see that usually they use the LdH HcR in a context where the limits between Geography and History are badly defined, although ten years ago, with the LDB 1996, these disciplines officially returned to the [Ensino Fundamental] Fundamental Teaching first grades curriculum, dismembered from the Social Studies discipline that have been in effect so far. This research shows that the teachers, through their speech, deceive or even go against the PNLD prescriptions, using the LdH HcR that has the authoral project format (Rojo 2006) and that seek to assume the role of the schoolastic History innovations messenger usually as archive, where they take passages, texts, images and ideas in order to teach History. Under this meaning, we conclude that the teachers say that they use, besides this LdH, the Regional LdH distributed by the PNLD 2004, other History didactic books coming from other PNLD choice processes, in addition to several publications wether directed to the school or not and, still, other materials produced within the school by themselves or their colleagues. It is also evidenced that the teachers declare to use these didactic materials starting from different combinations, which end by producing original History teaching and learning proposals and that bear as the main purpose to break the emptied perspective brought by the Social Studies. Finally, we conclude that although the schools under survey had received the History didactic book best evaluated by the PNLD 2004, this fact in itself hasnt granted that the History teaching in these schools has been renewed according to the new History didactic books proposals. Therefore, this paper refers other researchers studies concerning History teaching and seeks to contribute with new investigations, showing that besides granting good didactic materials, it is necessary to invest massive and systematically not only on the material resources but also and moreover on the continual education and working conditions in our schools and their professionals.
O objeto desta pesquisa são os usos que professoras do primeiro segmento do Ensino Fundamental dizem fazer do livro didático de História mais distribuído pelo PNLD 2004: História com Reflexão (Coleção Horizontes). Tal objeto se insere no entrecruzamento de dois campos de estudo: o do Ensino de História e o do Livro didático. Frente à complexidade do objeto, adotamos a perspectiva teórico-metodológica que associa pressupostos e procedimentos das pesquisas qualitativas, dialogando com outros campos notadamente, os da Sociologia da Educação e da História da Educação e, em específico, o da História do livro e o das Práticas de Leitura. Nessa perspectiva analítica, consideramos as críticas às análises de livros didáticos que, a partir da década de 1980, denunciam a ideologia veiculada por esses livros, em especial os de História e/ou Estudos Sociais, que não considera as especificidades dos saberes mobilizados nesses suportes, nem tampouco os sujeitos e contextos envolvidos no seu ensino e aprendizagem. Investigamos, especificamente, os usos do livro em questão por professoras das 4 série/5º ano escolar com o objetivo de descrever e analisar os usos que elas dizem faze desse livro distribuído pelo PNLD, buscando conhecer suas experiências com esse e outros materiais didáticos e os significados criados por elas em suas práticas docentes. Delineadas as condições pessoais e profissionais das professoras pesquisadas, pudemos verificar que de uma forma geral, usam o LdH HcR num contexto em que os limites entre a Geografia e História estão muito pouco definidos, ainda que essas disciplinas tenham, há dez anos, com a LDB 1996, retornado oficialmente ao currículo dos primeiros anos do Ensino Fundamental desmembradas da disciplina Estudos Sociais que vigorava até então. Esta pesquisa demonstrou que as professoras, por meio de suas falas, burlam ou mesmo contrariam as prescrições feitas pelo PNLD, usando o LdH HcR - que tem um formato de projeto autoral (Rojo 2006) e que busca assumir o papel de portador das renovações da História escolar - geralmente como arquivo, em que retiram trechos, textos imagens e idéias para ensinar História. Nesse sentido, concluímos que as professoras declararam usar, além desse LdH, o LdH Regional distribuído pelo PNLD 2004, outros livros didáticos de História advindos de outros processos de escolha do PNLD, além de diversos impressos de destinação escolar ou não e, ainda, outros materiais produzidos no interior da escola por elas mesmas ou por colegas. Evidenciamos ainda que as professoras declararam usar esses materiais didáticos a partir de diferentes combinações o que acabam po produzir propostas de ensino e aprendizagem em História originais e, que tem como principal objetivo romper com a perspectiva esvaziada trazida pelos Estudos Sociais. Enfim, argumentamos que, embora as escolas pesquisadas tenham recebido o livro didático de História mais bem avaliado pelo PNLD 2004, esse fato, em si, não tem garantido que o ensino de História, nessas escolas, tenha se renovado a par e passo com as propostas dos novos livros didáticos de História. Este trabalho, portanto, referenda estudos de outros pesquisadores sobre o ensino de História e busca contribuir com novas investigações, demonstrando que, para além de se garantir bons materiais didáticos, há que se investir maciça e sistematicamente, não só como aporte de recursos materiais, mas também e, principalmente, na formação continuada e nas condições de trabalho de nossas escolas e de seus profissionais.

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Frade, Cristina de Castro. "Componentes tácitos e explícitos do conhecimento matemático de áreas e medidas." Universidade Federal de Minas Gerais, 2003. http://hdl.handle.net/1843/CPSA-5TMEKB.

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Esse trabalho de tese investigou o desenvolvimento da aprendizagem dos componentes principalmente explícitos e principalmente tácitos do conhecimento de áreas e medidas de alunos de uma escola pública do ensino fundamental, durante dois momentos distintos de seus percursos escolares. A investigação resultou da convergência de duas vertentes de investigação: uma de natureza teórica e outra de natureza empírica. Com relação à vertente teórica foram configurados elementos para fundamentar em bases sólidas o estudo do conhecimento matemático e da aprendizagem matemática como sendo principalmente tácitos. Tais elementos foram buscados na teoria de Polanyi sobre conhecimento tácito, na visão construtivista social de Ernest do conhecimento matemático e nas teorias de aprendizagem situada ou comunidades de prática de Lave e Wenger. No que se refere à vertente empírica, o processo de investigação constou, inicialmente, da análise de um episódio ocorrido durante um contexto de conversação coletiva em sala de aula acerca da diferença entre figuras planas e figuras espaciais. O objetivo dessa pesquisa foi o de investigar como os componentes principalmente tácitos e principalmente explícitos, introduzidos por Ernest em seu modelo do conhecimento matemático e que adaptei para o conhecimento de áreas e medidas dos alunos, se manifestam em processos de aprendizagem. Isso feito, um estudo de caso foi realizado para investigar, propriamente, o desenvolvimento dos componentes. Um resultado relevante que, pareceu, emergir da análise do episódio está relacionado ao fato de que aquilo que o aluno diz literalmente quando está realizando uma tarefa não deve ser entendido, sempre, como uma expressão direta de seu pensamento. A análise sugeriu que, ao realizar uma tarefa oral, a resposta do aluno pode, aparentemente, estar equivocada sob o ponto da disciplina. Mas, isso não quer dizer, necessariamente, que o aluno não sabe a resposta, ou que não interiorizou certos conhecimentos. O suposto erro ou a suposta não-interiorização podem estar indicando que, no momento da verbalização, o tácito ainda estava sob construção e, portanto, predominava sobre o explícito. Ou ainda, uma obstrução do funcionamento tácito do pensamento do aluno podia estar ocorrendo devido a uma inaptidão da fala: o aluno podia estar num processo de elaboração do sistema simbólico que, ainda, não correspondia à sua compreensão tácita. Em relação ao estudo de caso, nele foram identificados todos os componentes do modelo de Ernest do conhecimento matemático adaptado para os alunos com maior ou menor intensidade e visibilidade. A análise sugeriu que o desenvolvimento dos componentes não ocorre em completa harmonia: alguns componentes afirmações, provas e raciocínios, linguagem e simbolismo, por exemplo predominaram sobre outros proposições e estética e valores. Mais do que isso, o desenvolvimento de alguns componentes mostrou afetar mais diretamente o desenvolvimento de certos componentes do que o de outros. Por exemplo, a análise indicou que um elemento da linguagem matemática oral, a saber, a comunicação social de um conhecimento matemático, parece se desenvolver com uma certa independência do componente métodos, procedimentos,... que expressa o saber fazer. O trabalho de tese é concluído indicando possibilidades de pesquisa futura na área de educação matemática que emergiram dos resultados dessas investigações.

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Dutra, Soraia Freitas. "A educação na fronteira entre museus e escolas: um estudo sobre as visitas escolares ao Museu Histórico Abílio Barreto." Universidade Federal de Minas Gerais, 2012. http://hdl.handle.net/1843/CPSA-92VHW9.

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Анотація:

The aim of this work is to analyse the relationship between museum and school, that is, how these social spaces of educational experiences interact. It also intends to show how these two environments and their respective actions upon individuals can contribute to citizens cultural development. The movement from the school universe to the museum is considered as a space/time of hybrid learning that is produced through the links of references between these two universes and, therefore, imbued with cultural differences. According to our analysis, the movement from the school to the museum can be seen not only as an exchange of environments but also as a movement of cultural references. Thus, school visits to the museum can be seen as intercultural displacements that can mobilize elements of both cultural contexts. From the beginning of the 90s up to now we have analysed the educational experiences developed in Abílio Barreto Historical Museum (BH-MG) concerning school visits to this cultural environment. We also analysed the uses and ways of building knowledge about the museum environment by the school in 2009. Our research consisted of two distinct and complementary periods: a diachronic and a synchronous analysis of the educational experiences in the museum in relation to the school environment. The process of collecting data in the museum was also divided into three periods: a documentary research (1stperiod) and an ethnographic research(2nd period). In order to take the school universe into account we carried out interviews with the teachers who visited Abílio Barreto in 2009 (3nd three). Taking into account concepts such as culture (GEERTZ; SHALINS; GREEN; GOMES), school culture (JÚLIA), years of school attendance and school experiences (FARIA FILHO; VIDAL), museum culture (MARANDINO, NASCIMENTO), experiences(DE CERTEAU), uses and knowledge building (DE CERTEAU, CHARTIER), all the analyses show the school visits to the museum as an experience that establishes a hybrid educational experience which can ultimately promote the learning of culture.
Este trabalho assenta-se sobre a temática da relação museu/escola e pretende analisar como esses dois espaços sociais de vivências educativas interagem e, como, a partir de seus universos próprios de ação, podem contribuir para a formação cultural dos cidadãos. Considera-se que o movimento de deslocamento do universo escolar para o universo museal constitui-se em um espaço/tempo de aprendizagem híbrido, produzido na articulação de referências da cultura escolar e da cultura museal e, portanto, impregnados de diferenças culturais. Em nossa perspectiva de análise, o deslocamento da escola para o museu pode ser compreendido não apenas como um deslocamento espacial, que possibilita uma mudança de ambiente de aprendizagem, mas também como um deslocamento de referências culturais. Nessa medida, a visita escolar ao museu é compreendida como um deslocamento intercultural capaz de mobilizar elementos dos dois contextos culturais. Foram analisadas as práticas educativas voltadas para o público escolar desenvolvidas no Museu Histórico Abílio Barreto (BH-MG), no período que se estendeu do inicio dos anos 90 do século XX até a atualidade e os modos de usos e apropriação do museu pela escola no ano de 2009. O estudo compreendeu dois momentos de pesquisa distintos e complementares: uma análise diacrônica e outra sincrônica das práticas educativas do museu na relação com a escola. O processo de coleta de informações no museu organizou-se em três fases: uma pesquisa documental (fase 1) e uma pesquisa etnográfica (fase 2). Para acessar o universo das escolas, realizaram-se entrevistas com professores que visitaram o museu naquele ano de 2009 (fase 3). Mobilizando conceitos como cultura (GEERTZ; SHALINS; GREEN; GOMES), cultura escolar (JULIA), escolarização e práticas escolares (FARIA FILHO; VIDAL;); cultura museal (MARANDINO; NASCIMENTO), práticas (DE CERTEAU); usos e apropriações (DE CERTEAU, CHARTIER), as análises apontaram a visita escolar ao museu como uma experiência que institui uma prática educativa híbrida capaz de potencializar/favorecer os processos de aprendizagem da cultura.

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Braga, Selma Ambrozina de Moura. "O texto de biologia do livro didático de ciências." Universidade Federal de Minas Gerais, 2003. http://hdl.handle.net/1843/CPSA-5WVTMF.

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This study reports the analysis of verbal text on biology topics in science textbooks for 5th through 8th grade. I examined two series of textbooks, which were recommended by the Textbook National Program of the Brazilian Education Ministry - PNLD/MEC. In Brazil, verbal texts have received little attention in educational research on science textbooks, hence, our decision to adopt this approach. Among the few studies on science textbooks, many consider only the inappropriateness of textbooks for the goals of schooling. Consequently, these studies tend to focus on issues such as the conceptions about the nature of science present in textbooks, the discriminatory ways in which certain groups of the society are portrayed in textbooks, how the subject matter knowledge is decontextulized and out of date; and the absence of experimental activities combined to the prevalence of activities involving only memorization and the application of formulas. In the present research, I adopt a different perspective, informed by studies in the field of language. Thus, the goal is to investigate the text on biology in textbooks highlighting the relationships between linguistic aspects of the verbal text and their conditions of production. The analysis is based on Bakhtins work on speech genres, considering the thematic, compositional, and stylistic features of utterances. This broad perspective frames the use of categories proposed by Bronckart, Halliday, Martin and Mortimer. Based on the systematization of the results of this research, I argue that these texts represent a particular discourse genre which is structured around the relationships between its conditions of production and the hybridization of elements from multiple speech genres, namely the scientific, the didactic, and the day-to-day speech genres. The study of text in science textbooks, adopting this perspective, appears to be very significant for understanding the textbooks and their roles in science teaching and learning, as well as science teacher professional development.
Este trabalho consiste na análise do texto de Biologia do livro didático de Ciências, com base em duas coleções de Ciências, do segmento de 5a a 8a série do Ensino Fundamental, recomendadas pelo Programa Nacional do Livro Didático PNLD/MEC. A decisão de analisar o texto verbal deve-se à constatação de que ele tem sido pouco considerado nas pesquisas sobre o livro didático no Brasil. Muitas pesquisas existentes quase sempre analisam apenas a inadequação dos livros didáticos para os propósitos da escola e, por via de conseqüência, no mais das vezes, discutem os modos como os autores do livro concebem a ciência, as formas preconceituosas e de discriminação de grupos sociais, os conteúdos desatualizados e descontextualizados, a ausência de atividades de experimentação, e as atividades que exigem apenas a memorização ou aplicação de fórmulas, entre outros. Esta pesquisa desenvolve-se, contrariamente, numa outra perspectiva, na área da linguagem e objetiva investigar o texto de Biologia do livro didático sob a ótica das relações entre aspectos lingüísticos do texto verbal e suas condições de produção. O referencial para a análise são as idéias de Bakhtin sobre os gêneros de discurso, em que se destacam aspectos que o autor considera como pertencentes ao conteúdo temático, ao estilo verbal e aos componentes composicionais. Esse referencial de fundo é operacionalizado a partir de categorias propostas por Bronckart, Halliday, Martin e Mortimer. Os dados da pesquisa, resultantes da análise dos textos verbais dos conteúdos de Biologia das duas coleções didáticas selecionadas, foram sistematizados e permitiram defender a idéia de que esses textos constituem um gênero de discurso próprio, que se organiza a partir das relações entre suas condições de produção e a hibridização de elementos dos gêneros de discurso científico, didático e cotidiano. Pesquisar o texto do livro didático de Ciências, na perspectiva da linguagem, parece ser bastante promissor tendo-se em vista o ensino e a formação do professor de Ciências. Aprender ciência é também aprender sua linguagem.

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Oliveira, Elania de. "Relações étnico-raciais e de gênero e o discurso da sala de aula de português: uma abordagem etnográfica interacional." Universidade Federal de Minas Gerais, 2008. http://hdl.handle.net/1843/CPSA-7PMH85.

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The current study is about an ethnographic research developed in a third grade Portuguese class of an elementary public school in Belo Horizonte, with 8 to 10 year-old students. The aim of the research is to discuss the relationship between the teaching of Brazilian Portuguese and the possible visibility of social categories such as race and gender among others, in the social interaction context. In this perspective, the social identities are seen as dynamic relationships, situated and discursively constructed. The approach is guided by the principles of Interactional Ethnography, Cultural Anthropology, and Critical Discourse Analysis. The data compilation took place based on the references of interactional ethnography and it involved the observation of the interactions between the participants (teacher and students, 16 boys and 14 girls) from February 15th to December 2nd of 2005. The data correspond to a total of 169 classes registered via videos and production of field notes. Additionally there were formal and informal interviews and analysis of several artifacts: notebooks, school books, readers, text productions, formal evaluations, and official documents. The main questions that conducted the study were: Which materials were used in the process of teaching Portuguese? Did these materials already present within themselves the possibility of contemplating and reflecting on racial and gender issues? Did racial and gender issues become present or not in the interactions between the participants? How were they approached? To answer these questions, an analytical process applying different angles of the analysis such as Microanalysis of Classroom Events was used. The results of the study show that the use of the principles of interactional ethnography and microanalysis of classroom events constitute a theoretical and methodological tool which is very explanatory of the questions involved in the interactions which are developed in the school environment. By means of this procedure, it was possible to see that we can find racial and gender relations among the processes that became visible in classroom events and the different ways in which they are expressed in society, at school, and in the classroom most of the time in a stereotyped way and that they go beyond the content taught.
O objetivo deste trabalho é discutir a relação entre o ensino de Português e a visibilidade ou não de categorias sociais de raça e de gênero, dentre outras, no contexto da interação social. Trata-se de uma pesquisa etnográfica desenvolvida em uma sala de aula de Português, de uma turma do terceiro ano do 2º Ciclo do ensino fundamental, com alunos entre 8 e 10 anos de idade, em uma escola pública de Belo Horizonte. Nessa perspectiva, as identidades sociais são vistas como relações dinâmicas, situadas e discursivamente construídas. A abordagem orienta-se pelos princípios da etnografia interacional, da antropologia cultural e da análise crítica do discurso. A coleta de dados foi realizada com base nos referenciais da etnografia interacional e envolveu a observação das interações entre os participantes (professora e alunos, sendo 16 meninas e 14 meninos), no período de 15 de fevereiro a 2 de dezembro de 2005. Os dados correspondem a 169 horas/aula, registradas por meio de filmagens e produção de notas de campo. Adicionalmente, foram realizadas entrevistas formais e informais e análise de artefatos diversos: cadernos, livros didáticos e de literatura, produções de textos, avaliações formais e documentos oficiais. As questões centrais que conduziram o estudo foram: Que tipo de atividades foram realizadas em sala de aula? Que materiais foram utilizados no processo de ensino do Português? Esses materiais já traziam em si a possibilidade de contemplar e refletir sobre questões raciais e de gênero? Questões raciais e de gênero se tornaram presentes ou não nas interações entre os participantes? Como foram abordadas? Para responder a essas perguntas, realizou-se um processo analítico aplicando diferentes ângulos de análise, entre eles a microanálise de eventos de sala de aula. Os resultados do estudo mostram que a adoção dos princípios da etnografia interacional e da microanálise de eventos de sala de aula constituem um instrumental teórico e metodológico bastante elucidativo das questões envolvidas nas interações que se desenvolvem no ambiente escolar. Por meio desse procedimento, foi possível evidenciar que, dentre os processos que se tornaram visíveis nos eventos de sala de aula, encontram-se as relações raciais e de gênero e as diferentes maneiras como esses processos se expressam na sociedade, na escola e na sala de aula na maioria das vezes de forma estereotipada , indo além do conteúdo ensinado.

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Gloria, Dilia Maria Andrade. "Uma Análise de fatores sociodemográficos e sua relação com a escolarização dos filhos em famílias de camadas médias." Universidade Federal de Minas Gerais, 2007. http://hdl.handle.net/1843/CPSA-7C8NFK.

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This research, developed in the field of Sociology of Education, with incursions in the Demographic domain, intends to analyze and comprehend the influence of the structure and size of the family, the order of birth and the gender of the children of middle class families in their schooling. Based on reports taken from parents and children of 30 investigated families, it tries to apprehend how these factors affect the specific ways in which each family conceives and acts regarding the school education of their children. Semi-structured interviews and two levels of analyses were done as a central method of investigation: the first level establishes relations between the socio-demographic factors proposed here and the schooling of the children in the investigated families; and a second one in which the focus of the analyses is narrowed so that is put into action the reconstruction of the unique process of schooling of children in three investigated families, highlighting possible details and complexities. The conclusion is that these four socio-demographic factors influence in different ways the schooling of the children, even in the same family. Even though these factors are many times co-related and also vulnerable to a series of other changes, some confirmations are evident: 1) the fact that the parents action is more effective in the families with a nuclear structure because of the presence and bigger involvement of both parents- makes their children, in general, have more benefits in their schooling as opposing to those who live with single parents and rebuilt homes; 2) as to the size of the family, the dilution of the parents resources because of a greater number of children is more evident in material matters than psychological (time and energy), so that the families with three or more children are more affected by the monetary costs of school education and are the ones that do more effort to fulfill their aspiration to a longer and successful schooling; 3) beyond the combining of factors that tend to compete to favor the schooling of the middle or the youngest child, in the majority of cases, the oldest are the ones that present the best school results, and;4) Although in the researched group, the models of socialization are less stereotyped, the separation by sex is felt; on one hand the greater school success of the girls is unquestionable and seems to translate their bigger investment, on the other hand when the choice of the university and the perspectives of the job market
Nesta pesquisa, desenvolvida no campo da Sociologia da Educação, com incursões no domínio da Demografia, analisa-se a influência da estrutura e do tamanho da família, da ordem de nascimento e do gênero dos filhos de famílias de camadas médias em sua escolarização. Mediante relatos colhidos junto a pais e filhos de 30 famílias, procurou-se apreender como esses fatores afetam os modos específicos com que cada família concebe e atua face à educação escolar de seus filhos. Como procedimento de investigação foram realizadas entrevistas semi-estruturadas. Foram efetuados dois níveis de análise: um primeiro, em que se estabelecem relações entre os fatores sociodemográficos propostos e a escolarização dos filhos nas famílias investigadas; e um segundo, em que se restringe o foco de análise para que se empreenda uma reconstrução do processo singular de escolarização dos filhos em três famílias, explicitando-se possíveis nuances e complexidades. Concluiu-se que os quatro fatores sociodemográficos influenciam de modo diverso na escolarização dos filhos, inclusive, numa mesma família. Embora esses fatores se mostrem muitas vezes correlacionados, e mesmo sujeitos a uma série de outras variações, algumas constatações evidenciam-se: 1) a ação parental mostra-se mais efetiva nas famílias de estrutura nuclear pela presença e maior envolvimento dos genitores o que faz com que seus filhos sejam, em geral, mais beneficiados em sua escolarização em relação aos que vivem em lares monoparentais ou recompostos; 2) quanto ao tamanho da família, a diluição dos recursos parentais em função do maior número de filhos apresenta-se mais patente em termos materiais do que psíquicos (tempo e energia), de modo que as famílias com três ou mais filhos são as mais afetadas pelos custos monetários da educação escolar e as que mais esforços empreendem no sentido de concretizar sua aspiração a uma escolaridade longa e bemsucedida; 3) para além da conjugação de fatores que tendem a concorrer para favorecer a escolarização do filho do meio ou do caçula, na grande maioria dos casos, os primogênitos são os que apresentam os melhores resultados escolares, e; 4) embora, no grupo pesquisado, os modelos de socialização se mostrem menos estereotipados, ainda assim a clivagem por sexo se faz sentir, de tal maneira que, se o maior sucesso escolar das meninas é incontestável e parece traduzir de fato seu maior investimento, ao se examinar a escolha do curso superior e as perspectivas do mercado de trabalho, verifica-se que os interesses e as relações sociais ainda fazem a balança pender favoravelmente para o sexo masculino.

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Le, Roux Patrick. "Suites régulières d'impulsions radio-fréquence en résonance magnétique : applications à l'IRM." Paris 11, 2006. https://tel.archives-ouvertes.fr/tel-00128349.

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Les séquences d'impulsions radiofréquence régulièrement espacées en Résonance Magnétique Nucléaire peuvent être abordées par des algorithmes simples de type polynomial (transformée en Z). Une simplification supplémentaire est apportée par l'utilisation de spineurs pour caractériser les rotations. On présente, comme première application, un algorithme de type effeuillage permettant la synthèse d'impulsions radiofréquence sélectives continues, plus particulièrement utilisé en IRM. Cet algorithme permet de s'affranchir de la non linéarité des équations de Bloch. Quelques détails d'implémentation non publiés sont donnés ainsi que quelques compléments théoriques comme la convergence de l'approximation par train d'impulsions dures et la prédiction de l'énergie déposée. On utilise ensuite les mêmes outils pour donner un modèle simplifiée des séquences CPMG et SSFP. On considère la rotation d'écho à écho et on explique la stabilisation naturelle des signaux par la dispersion de phase. Une caractérisation simplifiée mais d'usage assez large des processus de relaxation lors de telles séquences est également donnée. Le lien entre un algorithme polynomial de stabilisation des signaux de la séquence CPMG et une version discrétisée du principe adiabatique est proposée. Enfin un dernier chapitre aborde une séquence non-CPMG, basée sur une modulation quadratique de la phase du train d'impulsions, qui permet de s'affranchir de la sensibilité à la phase initiale de la séquence CPMG
Regular RF pulse trains used in NMR can be studied with simple algorithms of polynomial type using the Z transform. Another simplification is brought by the use of spinors to model the rotations. The first application presented is a ‘peel-off' algorithm which permits the synthesis of selective radiofrequency pulses as the ones used in MRI. This algorithm makes the non linearity of the Bloch equations easy to handle. Some unpublished implementation details are given along with some theoretical results concerning the convergence of the hard pulse train approximation and the prediction of the energy deposition. The same tools are subsequently used to obtain a simplified model of the CPMG and SSFP sequences. The echo to echo rotation is studied and the natural stabilization of the signals is explained by the dispersion of phase. The relaxation processes during such sequences are also modelled in a simplified but widely applicable manner. A previous polynomials stabilization algorithm is explained in terms of a discrete version of the adiabatic principle. The last chapter tackles with a non-CPMG sequence which is insensitive to the initial phase of the magnetization. This sequence is based on a quadratic phase modulation of the RF pulse train

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PIMENTEL, CECILIO JOSE LINS. "PERFORMANCE OF CPM AND CPM COMBINED WITH CONVOLUTIONAL CODES SYSTEMS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1990. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=9263@1.

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Este trabalho apresenta o desenvolvimento de um modelo, em tempo discreto, para a análise através de simulação em computador digital do desempenho de um sistema de comunicações móveis via satélite que utiliza modulação CPM (Continuous Phase Modulation) Esquemas que combinam códigos convolucional e CPM (CC/CPM) foram também examinados. Estes sistemas, conforme se pode observar, apresentam maior eficiência em termos da utilização de faixa de freqüência e potência, com relação ao esquema CPM puro. A seleção do esquema CC/CPM ótimo foi realizada utilizando um algoritmo eficiente para o cálculo da distância Euclideana mínima (d2min ). Novos códigos com d2min melhores foram obtidos com o emprego do codificador convolucional com realimentação. Por fim é examinada a decodificação de esquemas Codificador Convolucional/Modulador CPM combinados utilizando-se o Algoritmo-M, um Algoritmo subótimo em que a busca da seqüência transmitida é limitada. São realizadas simulações com o Algoritmo-M e compara-se com o Algoritmo ótimo (Algoritmo de Viterbi). Verifica-se que o Algoritmo M é bastante mais eficiente que o Algoritmo de Viterbi.
This work presents a model for performance analysis of a Mobile Satellite Communication system which incorporates Continuous Phase Modulation (CPM) codes. The analysis is carried out by computer simulation, using a discrete-time baseband model of the communication system. The case of convolutional codes combined with CPM schemes (CC/CPM) is also examined. New codes CC/CPM with better minimum Euclidean distance were obtained with a feedback convolutional encoder. Comparison of CC/CPM and pure CPM, constrained to the same complexity, shows that the former has better performance. The performance of a system which uses CC/CPM schemes, over an additive white Gaussian noise (AWGN) channel, with M-algorithm decoding ( a limited search algorithm) is evaluated by computer simulation. The simulation results also corroborate the fact that the M- Algorithm is far more efficient than the Viterbi Algorithm.

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Montague, Nicholas Patrick. "Development of CPMV-based particle technology." Thesis, University of East Anglia, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.439927.

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Suhail, Saad A. "CPM/LOB : new methodology to integrate CPM and line of balance." Thesis, Loughborough University, 1995. https://dspace.lboro.ac.uk/2134/25619.

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In 1963 the United States Federal Government established a Line of Balance Coordinating Committee to study LOB's applicability and its ties with network scheduling. Ever since many researchers and practitioners attempted to integrate the merits of CPM and LOB in graphical, operational research, and activity-dominated network scheduling. Nevertheless, the obstacles were not truly eliminated in a simple and practical way that was good enough to be accepted and adopted by the construction industry. This work presents CPM/LOB, a new methodology integrating both methods in a network context. It is simple to comprehend and apply using available commercial CPM computer programs, and does not require elaborate training. The method overcomes the vulnerability of CPM to changes in the sequence of work and inability to maintain work continuity for the working squads of the repetitive activities. It introduces float into LOB and revives LOB by creating access to it by commercially available and popular CPM packages. Several additional features are introduced to facilitate the management of planning and control of repetitive projects, such as identifying and quantifying progress that contradicts network logic, evaluating the effect of discrete activities, and measuring the progress regularity on multiple large housing contracts as well as single and small repetitive projects. The principles of the method have been published in Journal of Constructing Engineering and Management of the American Society of Civil Engineers in September 1994. Its practical application on projects in Kuwait and the United States is demonstrated by three case studies.

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Книги з теми "CPMA"

Carmichael, Bobby J. CPA review. Cincinnati: South-Western College Pub., 1995.

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Longo, Susan C. CPA review. Cincinnati: South-Western College Pub., 1995.

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Klammer, Thomas P. CPA review. Cincinnati: South-Western College Pub., 1995.

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British Library. Dept. of Printed Books. CPM plus. [London]: Bowker-Saur, 1993.

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Kaplan Educational Centers (Firm : New York, N.Y.), ed. CPA workbook. New York, NY: Simon & Schuster, 1997.

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Gleim, Irvin N. CPA review. 2nd ed. Gainesville, Fla: Gleim Pub., 2007.

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A, Hillison William, Irwin Grady M, and Kustanovich Michael, eds. CPA review. 2nd ed. Gainesville, Fla: Gleim Publications, 2015.

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Roszkowski, Mark E. Business law for the CPA candidate: CPA problems. New York: HarperCollins, 1992.

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Azambuja, Jocelin. CPMs & APMs: Uma revolução comunitária. Porto Alegre: EdiPUCRS, 2008.

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Black, Richard. Canadian policy analysis model: CPAM. Ottawa: Bank of Canada, 1997.

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Частини книг з теми "CPMA"

McIntosh, Lawrence. "CPMG." In Encyclopedia of Biophysics, 386. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-16712-6_320.

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Bass, R. "EEC/CPMP." In The Contribution of Acute Toxicity Testing to the Evaluation of Pharmaceuticals, 55–59. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-70390-4_8.

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Peters, Nils, Martin Dichgans, Sankar Surendran, Josep M. Argilés, Francisco J. López-Soriano, Sílvia Busquets, Klaus Dittmann, et al. "CPM." In Encyclopedia of Molecular Mechanisms of Disease, 458. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-29676-8_8218.

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Ishima, Rieko. "CPMG Relaxation Dispersion." In Protein Dynamics, 29–49. Totowa, NJ: Humana Press, 2013. http://dx.doi.org/10.1007/978-1-62703-658-0_2.

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Höher, Peter Adam. "CPM-Modulationsverfahren." In Grundlagen der digitalen Informationsübertragung, 353–60. Wiesbaden: Vieweg+Teubner, 2011. http://dx.doi.org/10.1007/978-3-8348-9927-9_16.

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Kastner, Gustav. "CPM-Netzplan." In Operations Research mit BASIC auf dem IBM PC, 133–44. Wiesbaden: Gabler Verlag, 1985. http://dx.doi.org/10.1007/978-3-322-86011-8_10.

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Midyett, F. Allan, and Suresh K. Mukherji. "CPA Meningioma." In Skull Base Imaging, 61–65. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-46447-9_10.

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Hajdu, Miklós. "CPM Scheduling." In Nonconvex Optimization and Its Applications, 17–78. Boston, MA: Springer US, 1997. http://dx.doi.org/10.1007/978-1-4757-5951-8_2.

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Höher, Peter Adam. "CPM-Modulationsverfahren." In Grundlagen der digitalen Informationsübertragung, 489–97. Wiesbaden: Springer Fachmedien Wiesbaden, 2013. http://dx.doi.org/10.1007/978-3-8348-2214-7_17.

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Ramsdell, John D. "Cryptographic Protocol Analysis and Compilation Using CPSA and Roletran." In Protocols, Strands, and Logic, 355–69. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-91631-2_20.

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AbstractThe Cryptographic Protocol Shapes Analyzer cpsa determines if a cryptographic protocol achieves authentication and secrecy goals. It can be difficult to ensure that an implementation of a protocol matches up with what cpsa analyzed, and therefore be sure the implementation achieves the security goals determined by cpsa.Roletran is a program distributed with cpsa that translates a role in a protocol into a language independent description of a procedure that is easily translated into an existing computer language. This paper shows how we ensure the procedure produced by Roletran is faithful to strand space semantics and therefore achieves the security goals determined by cpsa.Real implementations of cryptographic functions make use of probabilistic encryption, but cpsa will conclude that two encryptions are the same if they are constructed with the same plaintext and key. The paper concludes by showing how we ensure that executions of generated code that make use of probabilistic encryption achieve the goals determined by cpsa.

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Тези доповідей конференцій з теми "CPMA"

Singh, Pramod, and Rekha Aggarwal. "Design of CPMA for Ultra Wide Band Applications." In 2020 8th International Conference on Reliability, Infocom Technologies and Optimization (Trends and Future Directions) (ICRITO). IEEE, 2020. http://dx.doi.org/10.1109/icrito48877.2020.9198023.

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Warren, LaWanda, and Hongmei Chi. "Securing EHRs via CPMA attribute-based encryption on cloud systems." In the 2014 ACM Southeast Regional Conference. New York, New York, USA: ACM Press, 2014. http://dx.doi.org/10.1145/2638404.2675727.

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Al-Ibadi, Alaa, Samia Nefti-Meziani, and Steve Davis. "A circular pneumatic muscle actuator (CPMA) inspired by human skeletal muscles." In 2018 IEEE International Conference on Soft Robotics (RoboSoft). IEEE, 2018. http://dx.doi.org/10.1109/robosoft.2018.8404889.

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Banerjee, Tapomay, Sreha Pokharel, Rishi Arora, Oseiwa Kwapong, and Andrea Aniwell. "602 Child protection medical assessments (CPMA) during first lockdown- comparison with previous year." In Royal College of Paediatrics and Child Health, Abstracts of the RCPCH Conference–Online, 15 June 2021–17 June 2021. BMJ Publishing Group Ltd and Royal College of Paediatrics and Child Health, 2021. http://dx.doi.org/10.1136/archdischild-2021-rcpch.94.

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Hamdani, Yuda Muhammad, and Umar Khayam. "Application of Circular Patch Microstrip Antenna (CPMA) for Partial Discharge Detector in oil insulation." In 2019 2nd International Conference on High Voltage Engineering and Power Systems (ICHVEPS). IEEE, 2019. http://dx.doi.org/10.1109/ichveps47643.2019.9011052.

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Skelton, Ruth. "727 Child Protection Medical Assessment (CPMA) for children with fractures to inform a regional Bone Network." In Royal College of Paediatrics and Child Health, Abstracts of the RCPCH Conference, Glasgow, 23–25 May 2023. BMJ Publishing Group Ltd and Royal College of Paediatrics and Child Health, 2023. http://dx.doi.org/10.1136/archdischild-2023-rcpch.437.

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Hao, Guangbo, and Xianwen Kong. "A 3-DOF Translational Compliant Parallel Manipulator Based on Flexure Motion." In ASME 2009 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/detc2009-86075.

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This paper presents a novel class of 3-DOF translational compliant parallel manipulators (CPMs) based on flexure motion. The analytic mathematic modeling of CPMs is first developed. The analysis of CPMs is then implemented. It is shown that the proposed CPMs have many characteristics such as large range of motion, negligible cross-axis coupling, actuator complete isolation, and no loss motion and no rotational yaw. The inverse relationships of force-displacement of the 3-DOF CPM are further derived to calculate the input forces required for generating a specified path. In addition, the 3-DOF CPM can also be turned into a 2-DOF CPM. This work lays the foundation for the development of new spatial CPMs based on flexure motions for applications such as ultra precision manipulation.

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Hao, Guangbo, and Xianwen Kong. "Novel XY Compliant Parallel Manipulators for Large Displacement Translation With Enhanced Stiffness." In ASME 2010 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/detc2010-28141.

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A novel XY compliant parallel manipulator (CPM) and a spatial double three-beam module both with distributed compliance are first proposed for large range of translation. Then, an improved XY CPM is proposed by combining the above XY CPM and a spatial double three-beam module in parallel. The normalized analytical models are further presented for the novel XY CPM, double three-beam module and improved XY CPM. It is shown that the improved XY CPM has the following merits: (1) large range of motion, constrained parasitic error motion, output-decoupling, maximal actuation isolation and minimal lost motion; and (2) large out-of-plane stiffness and no friction with base. The improved XY CPM may also be used as a building block to construct new spatial CPMs.

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Yu, Jingjun, Zhenguo Li, Dengfeng Lu, Guanghua Zong, and Guangbo Hao. "Design and Analysis of New Large-Range XY Compliant Parallel Micromanipulators." In ASME 2014 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/detc2014-34982.

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The need for a compliant parallel micromanipulator (CPM) providing large motion range and high precision is increasing. Existing CPMs vary in constraint configurations and therefore it is necessary to verify/compare their characteristics. This paper compares three kinds of typical over-constrained CPMs, and derives their theoretical compliance matrix models pointing out constraint characteristics of the three kinematic configurations. Then the three CPMs are analyzed with FEA (finite element analysis), and results illustrate that the theoretical compliance matrix models are close to their FEA models. Moreover, cross-axis coupling along two motion axes (X&Y), parasitic motion and compliance fluctuation of motion stages are described in details. Through analyzing the FEA results, we present an improved CPM with a mirror-symmetry structure and redundant-constraint characteristic which can effectively constrain in-plane yaw and cross-axis coupling. It is shown that the improved CPM presented in this paper has a series of merits: large motion range up to 10mm×10mm in the dimension of 311mm×311mm×24mm, small compliance fluctuation (only 37.32% of that of the initial model), a smaller cross-axis coupling (only 24.39% of that of the initial model generated by a single-axis 5mm driving), a smaller in-plane parasitic yaw (only 53.57% of that of the initial model generated by double-axis 5mm driving).

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Zhu, Jiaxiang, Guangbo Hao, Shiyao Li, Shuwen Yu, and Xianwen Kong. "A Mirror-Symmetrical XY Compliant Parallel Manipulator With Improved Performances Without Increasing the Footprint." In ASME 2021 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/detc2021-69032.

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Abstract The design of XY compliant parallel manipulators (CPMs) remains challenging considering the tradeoff between the mirror-symmetry for better constrained undesired rotations and the small footprint, although a significant number of XY CPMs have been reported in extensive applications. This paper presents a new XY CPM using mirror-symmetry without increasing its footprint, mainly aiming to reduce the undesired parasitic rotations of input and output motion stages. The concept of higher degree of stiffness centre symmetry is deployed to tackle the parasitic rotations, leading to a multi-layer compact XY CPM design with each layer being a rotation-symmetrical design. A nonlinear and analytical model of the proposed XY CPM is derived using free body diagrams and the Beam Constrained Model (BCM) to accurately analyse its performance characteristics over a large range of motion. The designed XY CPM is then verified by the nonlinear finite element analysis (FEA) method. Finally, the proposed multi-layer design is comprehensively compared with the well-received single-layer rotation-symmetrical design. It is shown in the new design that the parasitic rotations of input and output stages along with the actuator isolation are significantly reduced and that the out-of-plane-stiffness is also significantly increased.

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Звіти організацій з теми "CPMA"

Liskov, Moses D., Paul D. Rowe, and F. J. Thayer. Completeness of CPSA. Fort Belvoir, VA: Defense Technical Information Center, October 2011. http://dx.doi.org/10.21236/ada562264.

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Fenves, Steven J., Sebti Foufou, Conrad Bock, Rachuri Sudarsan, Nicolas Bouillon, and Ram D. Sriram. CPM 2:. Gaithersburg, MD: National Institute of Standards and Technology, 2004. http://dx.doi.org/10.6028/nist.ir.7185.

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Hawley, Adam. PR-015-17606-R03 Flow Conditioner Swirl Reduction Testing. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), May 2019. http://dx.doi.org/10.55274/r0011585.

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This project evaluated the relative performance of the CPA 50E, CPA 55E, and CPA 65E flow conditioners manufactured by Canada Pipeline Accessories (CPA). The flow conditioners were tested to determine their ability to reduce swirl in a natural gas flow and to compare the audible noise of the flow conditioners over a range of flow rates.

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Dutta-Roy, Kunal, Vernon Mallu, and David Shaw. PR-426-123723-R01 Pipeline Variable Uncertainties and Their Effects on Leak Detection Sensitivity. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), July 2018. http://dx.doi.org/10.55274/r0011502.

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This document is a revision of industry standard procedures for the assessment of uncertainties in software-based leak detection systems. This document describes procedures for predicting uncertainties in the detection of leaks in pipelines using computational methods based upon physical hydraulic state measurements. This class of pipeline leak detection methods is commonly called Computational Pipeline Monitoring (CPM). The API1149 process and software-based leak detection systems (LDS), often loosely referred to as Computational Pipeline Monitoring (CPM) rely upon field measurement and instrumentation and simulation of operation. This creates a need for systematic procedures to allow rational design of CPM systems by providing an estimate of the sensitivity that can be expected given a CPM type and instrumentation, and given the engineering factors and operational environment of the pipeline. This document has a Click here to view related webinar. (member login required)

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G. Shvets, N. J. Fisch, A. Pukhov, and J. Meyer-ter-Vehn. Pulse compression in plasma: Generation of femtosecond pulses without CPA. Office of Scientific and Technical Information (OSTI), July 2000. http://dx.doi.org/10.2172/758641.

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Hartman, Joseph P., John J. Jaeger, John J. Jobst, Deborah K. Martin, and James Bigham. Computer-Aided Structural Engineering (CASE) Project. User's Guide: Pile Group Analysis (CPGA) Computer Program. Fort Belvoir, VA: Defense Technical Information Center, July 1989. http://dx.doi.org/10.21236/ada212544.

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Elmaghraby, Salah E., and David J. Michael. Documentation of BIDNET: Project Bidding for CPM and PERT Activity Networks. Fort Belvoir, VA: Defense Technical Information Center, June 1988. http://dx.doi.org/10.21236/ada198761.

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Wylie, Marilynn, and Glenn Green. On the Performance of Serially Concatenated CPM-OFDMA Schemes for Aeronautical Telemetry. Fort Belvoir, VA: Defense Technical Information Center, April 2011. http://dx.doi.org/10.21236/ada543383.

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Allen, J. C., and B. E. Wahlen. Multi-h CPM Synchronization in Military Channels Phase 2: A Simulation Framework. Fort Belvoir, VA: Defense Technical Information Center, September 2003. http://dx.doi.org/10.21236/ada419930.

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Prather, Craig S. CPM Scheduling: The Contracting Officers' Guide for Risk Minimization and Claims Analysis. Fort Belvoir, VA: Defense Technical Information Center, January 1998. http://dx.doi.org/10.21236/ada350969.

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