实时TV光电子全息散斑干涉仪及其在折射率场中的应用

介绍了一种不需PC微机支持图象卡的实时TV光电子全息散斑干涉仪,成功地应用于折射率流场的显示定量测量,并给出了实验结果。

Estudio socioeconómico preliminar de algunas fincas lecheras del departamento de Matagalpa

El objetivo primordial de este trabajo consistió en hacer un análisis socioeconomico preliminar de pequeñas fincas lecheras en el departamento de Matagalpa. Para esto se hizo uso de los cuestionarios llenados en la encuesta agropecuaria de la Oficina de Planificación del Consejo Nacional de Economía, durante los meses de Abril y Mayo de 1966. Con el fin de analizar los datos contenidos en tales boletas y estudiar la relación entre los factores de producción, se uso el método tabular. de ese estudio resulto que: 1) Solo un 3.5% de las fincas es arrendado. 2) Que existe un 59% de analfabetismo entre los jefes de familia y un 60% entre la población con las de 7 años de edad. 3) Se encontró que la mano de obra era mas abundante en los estratos menores, con eficiencia de 65.4% que en las de 100 menos de 200 manzanas (subió a un 133%). 4) Las fincas objeto de este estudio se caracterizan por ser explotadas en forma extensiva, ya que la población de vacas por manzana solo alcanza un 0.25%. Esto se refleja en los bajos ingresos que van desde 149 córdobas en el primer estrato a 177 en el ultimo. 5) De los agricultores en estudio un 23% recibió servicio crediticio bancario y un 21% recibió asistencia técnica. 6) Un 25% de los productores venden leche elaborada y un 23.5% hace uso de transporte animal. Ambos aspectos están sumamente ligados a las dificultades de mercadeo.

四氯化钛高温动力学性质的研究

<正> 一、前言 四氯化钛(TiCl_4)广泛应用于化学工业,特别是TiCl_4高温气相氧化生产钛白的工艺受到重视。TiCl_4的分子结构与反应能力反映出过渡族金属的复杂特性,在无机化学中占有重要地位。近年来激波管中激波化学的研究多集中于有机碳氢化合物与燃烧有关的问题上。随着

Orçamento público semi-impositivo para transferências voluntárias : diagnóstico, perspectivas e proposta de mudanças

Diagnóstico do modelo legal de transferências voluntárias realizadas pelo Governo Federal para os entes subnacionais, em face das recorrentes irregularidades relatadas pelos órgãos de controle. Questiona os motivos pelos quais o modelo vem sendo mantido há décadas diante da notória ineficiência. O fim da descentralização tutelada é a solução recomendada pela pesquisa.

Study of the shock motion in a hypersonic shock system turbulent boundary-layer interaction

Wall pressure fluctuations and surface heat transfer signals have been measured in the hypersonic turbulent boundary layer over a number of compression-corner models. The distributions of the separation shock oscillation frequencies and periods have been calculated using a conditional sampling algorithm. In all cases the oscillation frequency distributions are of broad band, but the most probable frequencies are low. The VITA method is used for deducing large scale disturbances at the wall in the incoming boundary layer and the separated flow region. The results at present showed the existence of coherent structures in the two regions. The zero-cross frequencies of the large scale structures in the two regions are of the same order as that of the separation shock oscillation. The average amplitude of the large scale structures in the separated region is much higher than that in the incoming boundary layer. The length scale of the separation shock motion region is found to increase with the disturbance strength. The results show that the shock oscillation is of inherent nature in the shock wave/turbulent boundary layer interaction with separation. The shock oscillation is considered to be the consequence of the coherent structures in the separated region.

Numerical investigation of dynamic stall of an oscillating aerofoil

The flow structure around an NACA 0012 aerofoil oscillating in pitch around the quarter-chord is numerically investigated by solving the two-dimensional compressible N-S equations using a special matrix-splitting scheme. This scheme is of second-order accuracy in time and space and is computationally more efficient than the conventional flux-splitting scheme. A 'rigid' C-grid with 149 x 51 points is used for the computation of unsteady flow. The freestream Mach number varies from 0.2 to 0.6 and the Reynolds number from 5000 to 20,000. The reduced frequency equals 0.25-0.5. The basic flow structure of dynamic stall is described and the Reynolds number effect on dynamic stall is briefly discussed. The influence of the compressibility on dynamic stall is analysed in detail. Numerical results show that there is a significant influence of the compressibility on the formation and convection of the dynamic stall vortex. There is a certain influence of the Reynolds number on the flow structure. The average convection velocity of the dynamic stall vortex is approximately 0.348 times the freestream velocity.

Crystal-growth in floating zone with phase-change and thermosolutal convections

Floating zone crystal growth in microgravity environment is investigated numerically by a finite element method for semiconductor growth processing, which involves thermocapillary convection, phase change convection, thermal diffusion and solutal diffusion. The configurations of phase change interfaces and distributions of velocity, temperature and concentration fields are analyzed for typical conditions of pulling rates and segregation coefficients. The influence of phase change convection on the distribution of concentration is studied in detail. The results show that the thermocapillary convection plays an important role in mixing up the melt with dopant. The deformations of phase change interfaces by thermal convection-diffusion and pulling rods make larger variation of concentration field in comparison with the case of plane interfaces.

Panorama do controle externo na Câmara dos Deputados : uma visão prática

Analisa os instrumentos práticos de Controle Externo disponíveis à Câmara dos Deputados, tanto no Regimento Interno quanto em legislação esparsa. Discute em que medida a instituição utiliza com eficiência esses instrumentos com vistas a cumprir sua função constitucional de fiscalizadora dos atos do Poder Executivo.