Smith S Parameters
Mostrando 1-12 de 16 artigos, teses e dissertações.
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1. Chemical constituents of methanolic extracts of Jatropha curcas L and effects on Spodoptera frugiperda (J. E. Smith) (Lepidoptera: Noctuidae)
The biological activity of seven extracts from leaves of different Jatropha curcas L (Euphorbiaceae) accessions was evaluated on Spodoptera frugiperda. Methanol extracts were incorporated into an artificial diet and offered to the larval stage of S. frugiperda. The parameters evaluated were length of larval and pupal stages, mortality of larval and total cyc
Quím. Nova. Publicado em: 2012
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2. Alterações biológicas, bioquímicas e ultra-estruturais em Spodoptera frugiperda (J. E. Smith, 1797) (Lepidoptera: Noctuidae) provocadas por extratos vegetais e compostos fenólicos / Changes biological, biochemical and ultrastructural in Spodoptera frugiperda (JE Smith, 1797) (Lepidoptera: Noctuidae) caused by plant extracts and phenolic compounds
The fall armyworm Spodoptera frugiperda is a polyphagous insect that causes damage in several crops, methods to control are often inefficient and this justifies the search for new forms of management. Thus, this study was to evaluate the effect of plant extracts and phenolic compounds on biological, biochemical and ultrastructural characteristics of S. frugi
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/02/2010
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3. A reconstrução de uma unidade didática para o ensino de inglês e as percepções de alunos
As part of the research project entitled Evaluation and Design of Didactic Materials for Teaching and Learning Languages in Different Settings and Contexts, the aim of this study is to investigate which contributions the re-elaboration of a didactic unit designed by the teacher/researcher can bring to the learning process of a group of students. The re-elabo
Publicado em: 2010
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4. Control of integrating process with dead time using auto-tuning approach
A modification of Smith predictor for controlling higher order processes with integral action and long dead-time is proposed in this paper. The controller used in this Smith predictor is an Integral-Proportional Derivative controller, where the Integrator is in the forward path and the Proportional and Derivative control are in the feedback, acting on the fe
Brazilian Journal of Chemical Engineering. Publicado em: 2009-03
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5. Life history of Spodoptera frugiperda (J.E.Smith) (Lep.:Noctuidae) on different hosts / História de vida de Spodoptera frugiperda (J.E.Smith) (Lepidoptera : Noctuidae) em diferentes hospedeiros
The fall armyworm, Spodoptera frugiperda (J.E. Smith) (Lep.: Noctuidae), is a cosmopolitan pest attacking several important plants. This work investigated the host selection and the life history characteristics for S. frugiperda fed corn, millet, cotton and soybean plants. Selection of hosts for oviposition was studied in plastic greenhouse using the host pl
Publicado em: 2009
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6. Retroanálise probabilista aplicada à análise dinâmica da cravação de estacas. / Probabilistic back-analysis applied to dynamic loading test for pile driving.
An dynamic loading test can be performed in concrete piles, bored piles, drilled shafts, auger cast-in-place (continuous flight auger) piles. Such essay bases on the Theory of the Propagation of Wave in piles with the aim of evaluate the capacity of static load mobilized from the dynamic event. The analysis of the test is made by a PC program (p.e. CAPWAP or
Publicado em: 2008
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7. Action of some insecticides with sterilizing properties on Spodoptera frugiperda (J. E. Smith, 1797) (Lepidoptera: Noctuidae) and its predator Doru luteipes (Scudder, 1876) (Dermaptera: Forficulidae) / Ação de alguns inseticidas com propriedades esterilizantes sobre Spodoptera frugiperda (J.E. Smith, 1797) (Lepidoptera: Noctuidae) e seu predador Doru luteipes (Scudder, 1876) (Dermaptera: Forticulidae)
The fall armyworm, Spodoptera frugiperda (Smith, 1797) (Lepidoptera: Noctuidae), is an important pest of the maize culture. In the tropical area, it causes severe damages, reducing the income from grains by up to 60%. Its control is normally carried out by the application of conventional insecticides, but this method is not recommended due to the negative as
Publicado em: 2007
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8. Desenvolvimento do processo combinado de desidratação osmotica-fritura para obtenção de chips de manga. / Development of the agreed process of osmotic dehydration - fryinf for attainment of sleeve Chips.
The development of new products using national raw materials is of considerable importance to the national economy, adding value to the product and decreasing surplus production, resulting in increasingly smaller losses. Throughout the World, the mango stands out amongst the tropical fruits, being a cheap raw material, produced in abundance in this country,
Publicado em: 2005
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9. Metodologia de priorização de equipamentos medico-hospitalares em programas de manutenção preventiva
The safety of patients and users, the quality in the service and a higher availability of medical equipment are goals and constant worries in health institutions. Programs of preventive maintenance contribute to achieve these targets, but the inclusion of all equipment becomes financially not viable for the institution. 50 it is necessary to develop a way es
Publicado em: 2004
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10. Estudos de Bacillus thuringiensis Berliner visando ao controle de Spodoptera frugiperda (J.E.Smith). / Bacillus thuringiensis berliner research applied for the control of Spodoptera frugiperda (J. E. Smith).
From 24 soil samples about 461 bacterial colonies have been isolated, and 190 were identified as Bacillus thuringiensis (Bt). The relation between soil chemical characteristics and the presence of this pathogen may be expressed by the equation iBt = -0,4 + 0,6Ca + 0,07Cu + 0,009Fe - 0,53Mg -0,12Mn + 1,26Zn. Among 83 Bt isolates assayed against Spodoptera fru
Publicado em: 2004
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11. Projeto e otimização de pre-amplificadores de transimpedancia para recepção optica em 1 Gbit/s
This work shows the design and implementation of transimpedance pre-amplifiers for optical receivers working up to 1 Gbit/s. They are GaAs MESFET two-stage amplifiers fed by a PIN photodiode. Three pre-amplifiers were designed. In the first circuit an a.c. coupling between amplifying stages was used while, in the second, a d.c. coupling was used. For both ci
Publicado em: 1989
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12. Estudo de amplificadores usando transistores bipolares em microondas
The purpose of this study is to present the basic concepts for designing microwave bipolar transistor amplifiers. In this work the transistor is considered to be a two-port device characterized by the scattering parameters. These scattering (S) parameters are measured for specific bias conditions over the desired frequency range (1 to 2 GHz). The rules for t
Publicado em: 1978