318 research outputs found
Darold Knowles Remembers Mickey Mantle\u27s Home Run
No full textKAIT reporter Dick Clay interviews Chicago Cubs pitcher Darold Knowles after a duck hunt. Knowles remembers the home run that New York Yankee Mickey Mantle hit off of his pitch. Knowles also discusses the Cubs chances for the 1977 season.https://arch.astate.edu/kait8-sports/1015/thumbnail.jp
Tower, Darold, 1939-2014, Tower, Darlene, 1941- &Tower, Jonathan, a portrait.
No full textPortrait of Darold, Darlene, & Jonathan Tower, southeast Kansas residents and participants in the Southeast Kansas Oral History Project.https://digitalcommons.pittstate.edu/seks_farm_photos/1091/thumbnail.jp
Radiation effects on breakdown in silicon multiguarded diodes
No full textWe have investigated the current-voltage characteristics of silicon PIN diodes with a number of different multiguard structures. These structures were designed to increase the overall device breakdown voltage. The same measurements were carried out after gamma irradiation at different doses and neutron irradiation at fluences beyond type-inversion. This study is a first step towards defining guard structures optimized for operation in high-radiation environments such as those expected at the LHC
Study of Punch-through Characteristics In Irradiated Mosfets
No full textThe DC and low frequency AC characteristics of the punch-through (PT) conduction have been examined in MOSFETs with different channel width/length ratios, fabricated on high resistivity Si substrates. The experimental results can be fitted by an analytical model deriving from a previous one developed for BARRITT devices. The modifications on the PT conduction induced by high dose neutron irradiation have been studied at various temperatures. The effects due to the radiation induced deep levels cannot be easily taken into account into the DC model, but can still be interpreted by using the AC model of the device
Development of a composition estimator for binary distillation columns. Application to a pilot plant
No full textA nonlinear extended Kalman filter, which infers the compositions of the streams leaving a binary distillation column from temperature measurements, is developed. The accuracy of the distillation column model on which the estimator is based, is discussed in connection with the reliability of the obtained estimates. The estimator performance is checked by comparison with the dynamic behavior of a distillation pilot plant, where the separation of a binary mixture of ethanol and water takes place
ANÁLISE DE ERROS COMETIDOS POR ALUNOS DE 8º ANO DO ENSINO FUNDAMENTAL EM CONTEÚDOS DE ÁLGEBRA
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Previous issue date: 2013-05-24Coordenação de Aperfeiçoamento de Pessoal de Nível SuperiorThis research aims to analyze errors made by students in the 8th grade of elementary school in solving algebraic questions. Specific objectives are: a) analyze the types of errors made by students of 8th grade in solving algebraic questions b) to test teaching strategies drawn from the errors made by students using the Hot Potatoes software. The research is qualitative and took place in three stages. The first stage was developed in a public school in the city of Tupanciretã, with the participation of 23 students from 8th grade, to which was applied a test with questions on algebra. The second stage took place in a private school in the same county, with 10 students, also of 8th grade, applying the same test. In the third stage, we tested activities to overcome the errors, using the Hot Potatoes software. The literature review listed elements of: Algebra and its teaching, the National Curriculum Parameters and textbooks, error analysis and the use of technology in mathematics teaching. From the data collected, it was noticed that students come to the final series of elementary school with many difficulties in algebra, in particular on the distributive property of an operation and generalization of patterns. As a suggestion for future work related to these difficulties among students of 8th grade, we proposed a set of activities to be implemented through Hot Potatoes, comprising the product of this dissertation professional.A presente pesquisa tem como objetivo analisar erros cometidos por estudantes de 8º ano do Ensino Fundamental na resolução de questões algébricas. Os objetivos específicos são: a) analisar os tipos de erros cometidos por estudantes de 8º ano na resolução de questões algébricas; b) testar estratégia de ensino elaborada a partir dos erros cometidos pelos estudantes, com uso do software Hot Potatoes. A investigação tem caráter qualitativo e realizou-se em três etapas. A primeira etapa desenvolveu-se em uma escola pública do município de Tupanciretã, com a participação de 23 alunos de 8º ano do Ensino Fundamental, aos quais se aplicou um teste com questões sobre conteúdos de Álgebra. A segunda etapa teve lugar em uma escola privada do mesmo município, com 10 alunos, também de 8º ano, com aplicação do mesmo teste. Na terceira etapa, realizou-se a testagem de atividades para superação dos erros, usando o software Hot Potatoes. A revisão de literatura elencou elementos sobre: a Álgebra e seu ensino; os Parâmetros Curriculares Nacionais e os livros didáticos; a análise de erros; e o uso de tecnologia no ensino de Matemática. Pelos dados coletados, percebeu-se que os estudantes chegam até os anos finais do Ensino Fundamental com muitas dificuldades relativas à Álgebra, em especial quanto à propriedade distributiva de uma operação em relação a outra e à generalização de padrões. Como sugestão para futuros trabalhos relacionados a essas dificuldades encontradas entre alunos de 8º ano, propôs-se um conjunto de atividades a serem implementadas por meio do Hot Potatoes, que compõem o produto desta dissertação de mestrado profissional
A SPICE model of the ohmic side of double-sided Si microstrip detectors
No full textWe have developed a SPICE model for the ohmic side of AC-coupled Si microstrip detectors where interstrip isolation is obtained via field plates. The interstrip isolation has been measured in various conditions by varying the field plate voltage. Simulations have been compared with experimental data in order to determine the values of the SPICE parameters for different voltages applied to the field plates. The model is able to predict correctly the frequency dependence of the coupling between adjacent strips. Furthermore, we have used such model for the study of the signal propagation along the detector when a current signal is injected in a strip. Only electrical coupling is considered here, without any contribution due to charge sharing derived from carrier diffusion. For this purpose, the AC pads of the strips have been connected to a read-out electronics and the current signal has been injected into a DC pad. Good agreement between measurements and simulations has been reached for the central strip and the first neighbours. Experimental tests and computer simulations have been performed for four different strip and field plate layouts, in order to investigate how the detector geometry affects the parameters of the SPICE model and the signal propagation. Furthermore we have considered neutron irradiated devices to study the modifications induced by radiation on the detector performance and the impact on the SPICE model
Noise characteristics in irradiated multiguard structures
No full textMultiguard structures are designed in order to limit the electrical field intensity around a p-n junction. With these devices the breakdown voltage in silicon microstrip detectors can be greatly enhanced. In this work we investigated the electrical properties of these devices and their noise performance. Four different layouts have been considered, consisting of floating p(+) and/or n(+) guards around the active area, In the best case, such a structure can tolerate bias up to several hundred Volts without breakdown. For each layout the DC electrical characteristics have been compared to the RMS noise measured as a function of the applied voltage. The same measurements were carried out after neutron irradiation, to dose levels similar to those expected in the LHC experiments
The movement and endogenous levels of plant growth regulators during water-stress-induced abscission in cotton
No full textAbscission and the movement of, as well as the endogenous levels of, plant growth regulators was investigated in cotyledons of cotton (Gossypium hirsutum L. cv. Stoneville 213) before, during and after periods of moisture deficit. Abscission of cotyledons was observed during and after 24 hrs after various levels of plant water stress were achieved. The threshold plant water potential at which abscission was induced was approximately -13 bars. There was a dramatic increase in abscission up to 75 to 80% of the cotyledons within each pot, as plant water potential decreased to approximately -20 bars. Further increases in water stress did not appreciably increase the level of abscission (75 to 80%). Basipetal and acropetal transport of ¹�C-labeld plant growth regulators, indole acetic acid (IAA), abscisic acid (ABA), kinetin, and gibberellin A₃ (GA₃), were examined independent of uptake or exit from 20 mm petiole sections. ¹�C-IAA transport was both polar and active, and water stress has a marked effect on basipetal transport. The capacity of the petioles of plants grown under well-watered conditions to transport ¹�C-IAA was approximately 60% of the label transported over a 2 hr period. This level of transport was constant in a range of water potentials from -4 to -9 bars. The transport capacity was reduced to approximately 30%/2 hr in plants with water potentials ranging from -9 to -12 bars respectively. ..
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