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Física no computador: o computador como uma ferramenta no ensino e na aprendizagem das ciências físicas
Fiolhais, Carlos;Trindade, Jorge;
Revista Brasileira de Ensino de Física , 2003, DOI: 10.1590/S1806-11172003000300002
Abstract: the difficulties that many pupils show in understanding some physical processes are well known. among various reasons for failure in physics learning old or misguided education methods have been pointed out. the need to diversify methods to attack pedagogical failure led to the increasing use of the computer in physics education. currently this tool offers various possibilities to help solving problems in physics education. we present an historical summary of the rise of computers in education. we relate computer applications to advances in learning theories. we review the main computer uses in science education, from simulations to virtual reality, including data acquisition and internet. although the balance of the use of the computers in education is clearly positive, many questions remain. in effect, in spite of its recognized potentialities, the computer did not become the magical key of educative success. we discuss some of the standing difficulties. the pedagogical potential of the computer could only be carried through if good educative software would become available and if this would be smoothly connected to syllabus and practice.
Física no computador: o computador como uma ferramenta no ensino e na aprendizagem das ciências físicas
Fiolhais Carlos,Trindade Jorge
Revista Brasileira de Ensino de Física , 2003,
Abstract: S o conhecidas as dificuldades que muitos alunos apresentam na compreens o dos fen menos físicos. Entre as raz es do insucesso na aprendizagem em Física s o apontados métodos de ensino desajustados das teorias de aprendizagem mais recentes assim como falta de meios pedagógicos modernos. A necessidade de diversificar metodos para combater o insucesso escolar, que é particularmente nítido nas ciências exactas, conduziu ao uso crescente e diversificado do computador no ensino da Física. O computador oferece actualmente varias possibilidades para ajudar a resolver os problemas de insucesso das ciências em geral e da Física em particular. Neste trabalho, apresentamos uma breve resenha histórica da sua ascens o no ensino. Procuramos relacionar a aplica o do computador com avan os nas teorias de aprendizagem. Analisamos os principais modos de utiliza o do computador no ensino, desde as simula es até a realidade virtual, passando pela aquisi o de dados em laboratório e pela Internet. Apesar do balan o da utiliza o dos computadores no ensino se revelar inegavelmente positivo, subsistem numerosos problemas por resolver. Com efeito, nao obstante as suas reconhecidas potencialidades, o computador nao se tornou a chave mágica do sucesso educativo. Discutimos algumas dessas dificuldades. O potencial pedagógico dos computadores s o poderá ser plenamente realizado se estiverem disponíveis programas educativos de qualidade e se existir uma boa articula o deles com os currículos e a prática.
A utiliza??o de informantes-chave da comunidade na identifica??o de pessoas portadoras de altera??es cinético-funcionais da cidade de Caxias do Sul, RS
Renosto,Alexandra; Trindade,Jorge Luiz de Andrade;
Ciência & Saúde Coletiva , 2007, DOI: 10.1590/S1413-81232007000300021
Abstract: purpose: remaining functionally active within a specific social context seems to be one of the hardest challenges faced by our society. the purpose of this paper is to study the epidemiological profiles of people with functional kinetic alterations as noted by key informants living in caxias do sul, rio grande do sul state, brazil, considering social, economic and cultural characteristics, as well as family/individual profiles and healthcare aspects, linked to functional capacities. methodology: this research project included an observational descriptive study. the population studied consisted of people suffering from functional kinetic alterations noted by from key informants, known as chapel-keepers. the tools used were: questionnaires addressed to the chapel-keepers, structured interviews and a barthel index rating for the functionally challenged. findings: only 21.9% of the population under study is being treated through physiotherapy. the use of key informants is a feasible alternative for helping the functional diagnosis of this population group. the characteristics of the population under study indicate the absence of physiotherapy and the need for effective programs addressing this problem.
Atomic orbitals and their representation: can 3-D computer graphics help conceptual understanding?
Trindade, Jorge;Fiolhais, Carlos;Gil, Victor;
Revista Brasileira de Ensino de Física , 2005, DOI: 10.1590/S0102-47442005000300004
Abstract: quantum mechanics is a non-intuitive subject. for example, the concept of orbital seems too difficult to be mastered by students who are starting to study it. various investigations have been done on student's difficulties in understanding basic quantum mechanics. nevertheless, there are few attempts at probing how student's understanding is influenced by appropriate visualization techniques, which are known to help conceptual understanding. ''virtual water'' is a 3-d virtual environment we have designed and built to support the learning of physics and chemistry at final high school and first-year university levels. it focuses on the microscopic structure of water and explores, among others, atomic and molecular orbitals. having asked a group of first-year students of sciences and engineering courses at the university of coimbra, portugal, to describe how they conceive electrons in atoms we found some common misconceptions. we have tried, with partial success, to overcome them by making students explore our virtual environment. the most relevant characteristics of the virtual environment which contributed to student's conceptual understanding were 3-d perception and navigation.
Desenvolvimento de um microerosómetro do tipo TMEM para aplica o em plataformas rochosas litorais
Mário Neves,Ana Ramos Pereira,Manuela Laranjeira,Jorge Trindade
Finisterra - Revista Portuguesa de Geografia , 2001,
Abstract: DEVELOPMENT AND APPLICATION OF A TRAVERSING MICRO-EROSION METER FOR SHORE PLATFORMS – The study of the shore platforms specific environmental conditions requires accurate equipment to measure erosion rates. In this paper, the construction details of a Traversing Micro-Erosion Meter (TMEM) is described. This TMEM adds some improvements to previous devices that aim to increase the data set collected, both in quality and in quantity. The installation and measurement procedures are described, as well as the advantages and limitations of this equipment. An experimental survey was carried out within the tidal range of the limestone shore platform of Tombadoiros, in a sector of the Portuguese western coast. For a 96 days period in the autumn/winter of 2000/2001, the mean rate of erosion at the site was 0,153mm/year. However, this result includes disturbances associated with the settlement of the black lichen Verrucaria maura in 58 % of the measuring points. It was found that the mean rate of erosion in the clean rock surface was 2,5 higher when compared to the area colonized by the lichen.
Optical Fiber Sensing Using Quantum Dots
Pedro Jorge,Manuel António Martins,Tito Trindade,José Luís Santos,Faramarz Farahi
Sensors , 2007, DOI: 10.3390/s7123489
Abstract: Recent advances in the application of semiconductor nanocrystals, or quantumdots, as biochemical sensors are reviewed. Quantum dots have unique optical properties thatmake them promising alternatives to traditional dyes in many luminescence basedbioanalytical techniques. An overview of the more relevant progresses in the application ofquantum dots as biochemical probes is addressed. Special focus will be given toconfigurations where the sensing dots are incorporated in solid membranes and immobilizedin optical fibers or planar waveguide platforms.
ESTIMATIVA DO COEFICIENTE DE DETERMINA??O GENOTíPICA EM MAMOEIROS (Carica papaya L.) INOCULADOS COM FUNGO MICORRíZICO ARBUSCULAR
TRINDADE, ALDO VILAR;DANTAS, JORGE LUIZ LOYOLA;ALMEIDA, FLORíCIO PINTO DE;MAIA, ISABEL CRISTINA SILVA;
Revista Brasileira de Fruticultura , 2001, DOI: 10.1590/S0100-29452001000300033
Abstract: an experiment was conducted at the embrapa ? cassava and tropical fruit crops with the aim of estimating the genotypic determination coefficient (b) of papaya for its capacity of associate and response to arbuscular mycorrhizal fungi (amf). four genotypes and one variety of both "solo"and "formosa" groups were tested, inoculated or not with gigaspora margarita in a soil which received 30 mg dm-3 of phosphorus. data of shoot dry weight (sdw), mycorrhizal efficiency and colonization were statistically analized to generate the coefficient. all genotypes responded significantly to amf but plants from "formosa" group showed lower root length; mycorrhiza efficiency and colonization were similar for both groups, but there was no correlation between these characteristics; inoculation increased p, k and cu absorption with higher values for the variety of each group. coefficient "b" showed that for "formosa" group, plant breeding may modulate shoot plant production, root length, plant heigth and mycorrhizal effeciency; for "solo"group this effect showed to be more probable for root colonization than to mycorrhizal efficiency.
ESTIMATIVA DO COEFICIENTE DE DETERMINA O GENOTíPICA EM MAMOEIROS (Carica papaya L.) INOCULADOS COM FUNGO MICORRíZICO ARBUSCULAR
TRINDADE ALDO VILAR,DANTAS JORGE LUIZ LOYOLA,ALMEIDA FLORíCIO PINTO DE,MAIA ISABEL CRISTINA SILVA
Revista Brasileira de Fruticultura , 2001,
Abstract: O trabalho objetivou determinar o coeficiente de determina o genotípica (b) do mamoeiro (Carica papaya L.) quanto à capacidade de se associar e responder ao fungo micorrízico arbuscular (FMA) Gigaspora margarita. O experimento foi instalado em casa de vegeta o da Embrapa Mandioca e Fruticultura, usando solo com uma dose única de fósforo (20 mg dm-3). Os tratamentos foram representados por quatro genótipos de cada um dos grupos 'Solo' e 'Formosa', mais as variedades 'Improved Sunrise Solo Line 72/12' e 'Tainung No 1', submetidas ou n o à inocula o do fungo Gigaspora margarita. Foi utilizado um delineamento de blocos casualizados, com 4 repeti es. Após a coleta dos dados, estimou-se o coeficiente "b" para os seguintes caracteres: parte aérea, comprimento de raiz, altura de planta, eficiência micorrízica e coloniza o. Os genótipos testados responderam à inocula o do fungo MA; os genótipos do grupo Formosa apresentaram menor comprimento de raiz; a eficiência micorrízica e a coloniza o radicular média para os dois grupos de plantas foram similares, situando-se em 60% e 50%, respectivamente; a inocula o aumentou a absor o de P, K e Cu, sendo esse efeito maior na variedade representante de cada grupo; o coeficiente "b" demonstrou que o melhoramento de plantas pode modular a produ o de parte aérea, comprimento de raízes, altura de plantas e a eficiência micorrízica do grupo Formosa; para o grupo Solo este efeito mostrou-se mais provável para coloniza o radicular e menos provável para produ o de parte aérea, eficiência micorrízica, comprimento de raízes e altura de plantas.
Bacillus thuringiensis: general characteristics and fermentation Bacillus thuringiensis: características gerais e fermenta o
Elisangela Andrade Angelo,Gislayne Trindade Vilas-B?as,Raúl Jorge Hernan Castro-Gómez
Semina : Ciências Agrárias , 2010,
Abstract: The insect control is carried out mostly by chemical products, whose cumulative effects cause serious losses to environmental and human health, highlighting rapid selection of resistant insects. Biological control by entomopathogenic bacteria is an efficient alternative, mainly due to high specificity, absence of resistance in the target insects and low environment residual effect. Bacillus thuringiensis is a Gram-positive spore-forming bacterium that produces a parasporal crystal protein toxic for many insect species. Despite the widespread use of B. thuringiensis based products in biological control of insects, there are little studies about its multiplication, sporulation and crystal production, as so many trade secrets information. This revision was aimed at gathering general information about B. thuringiensis, as well as its production in culture media. O controle de insetos é realizado, em sua maioria, por produtos químicos; cujos efeitos cumulativos ocasionam grandes prejuízos ambientais e à saúde humana, destacando-se ainda a rápida sele o de insetos resistentes. O controle biológico por entomopatógenos é uma alternativa eficiente, principalmente devido a sua alta especificidade, ausência de resistência nos insetos alvos e baixo efeito residual no ambiente. Bacillus thuringiensis é uma bactéria Gram-positiva esporulante, produtora de cristais protéicos com atividade inseticida. Apesar do amplo uso B. thuringiensis no controle biológico, há poucos trabalhos publicados quanto a sua multiplica o, esporula o e produ o de cristais, visto que muitas informa es s o segredos industriais. Esta revis o teve por objetivo reunir informa es gerais sobre B. thuringiensis, bem como quanto sua produ o em meios de cultivo.
The ceramic artifacts in archaeological black earth (terra preta) from Lower Amazon Region, Brazil: chemistry and geochemical evolution
Costa, Marcondes Lima da;Kern, Dirse Clara;Pinto, Alice Helena Eleotério;Souza, Jorge Raimundo da Trindade;
Acta Amazonica , 2004, DOI: 10.1590/S0044-59672004000300004
Abstract: this paper carried out a chemical investigation of archaeological ceramic artifacts found in archaeological sites with black earth (abe) in the lower amazon region at cachoeira-porteira, state of pará, brazil. the ceramic artifacts, mostly of daily use, belong to konduri culture (from 900 to 400 years bp). they are constituted of sio2, al2o3, fe2o3, na2o and p2o5; sio2 and al2o3 together add up to 80 % and indicate influence of acid rocks, transformed into clay minerals basically kaolinite. the relative high contents of p2o5 (2.37 % in average) come out as (al,fe)-phosphate, an uncommon fact in primitive red ceramics, but found in some roman and egyptian archaeological sites. the contents of the trace elements are similar or below the earth's crust average. this chemical composition (except p2o5) detaches saprolite material derived acid igneous rocks or sedimentary ones as the main raw material of the ceramics. the contents of k, na and ca represent the feldspars and rock fragments possibly introduced into saprolitic groundmass, indicated by mineralogical studies. the presence of cauixi and cariapé as well as quartz sand was confirmed by optical microscope, sem analyses and by the high silica contents of ceramic fragments. phosphorus was possibly incorporated into groundmass during cooking of foods, and abe soil profile formation developed on yellow latosols. the raw materials and its tempers (cauixi, or cariapé, feldspar, crushed rocks, old ceramic artifacts and quartz fragments) are found close to the sites and therefore and certainly came from them.
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