气流激光的增益、强度和功率理论

在速率方程中唯象地引进粒子的热速度分布,求得气流激光的增益、强度和功率诸关系.均匀加宽为主时本文关系与文[1]的理论结果一致,流速为零时简化为非流动气体激光的熟知关系~[4]. 分析中考虑了镜子反射率变化、光腔上游气体激励度随时间而变化的影响.对连续和脉冲CO_2气动激光进行了具体计算.

Experiment on the thermocapillary convection of a mercury liquid bridge in a floating half zone

A liquid bridge of a floating half zone consisting of liquid mercury sealed in a glass tube with nitrogen atmosphere was used for the experiment of thermocapillary convection with a low Prandtl number liquid. A non-contacted diagnostic method was developed to monitor the surface flow and the surface oscillation. A growing surface film (or skin) is a crucial source to suppress thermocapillary convection, and is discussed in this paper. For the case of a mercury Liquid bridge, the critical Marangoni number was obtained as 900, and the oscillatory frequency was around 5 Hz.

Molecular dynamics studies on the local disordering of σ3 and σ11 grain boundaries in aluminium bicrystal

Molecular dynamics (MD) simulations using Morse interaction potential are performed in studies of [110] symmetrical tilt grain boundary (GB) structures with mis-orientation angles 50.5 degrees(Sigma 11), 129.5 degrees(Sigma 11), 70.5 degrees(Sigma 3) and 109.5 degrees(Sigma 3) at various tempratures. The GB structures are found to start local disordering at about 0.5T(m)(T-m is the melting point of aluminium) for 50.5 degrees(Sigma 11), 0.32T(m) for 129.5 degrees(Sigma 11) and 0.38T(m) for 70.5 degrees(Sigma 3), respectively. These results agree with conclusions deduced from the anelastic measurements. But, for twin-boundary structure 109.5 degrees(Sigma 3), this disordering has not been found even when temperature increases up to 0.9T(m).

On the interaction of water waves and seabed by the porous medium model

The interaction of water waves and seabed is studied by using Yamamoto's model, which takes into account the deformation of soil skeletal frame, compressibility of pore fluid flow as well as the Coulumb friction. When analyzing the propagation of three kinds of stress waves in seabed, a simplified dispersion relation and a specific damping formula are derived. The problem of seabed stability is further treated analytically based on the Mohr-Coulomb theory. The theory is finally applied to the coastal problems in the Lian-Yun Harbour and compared with observations and measurements in soil-wave tank with satisfactory results.

A perturbational h4 exponential finite-difference scheme for the convective diffusion equation

A perturbational h4 compact exponential finite difference scheme with diagonally dominant coefficient matrix and upwind effect is developed for the convective diffusion equation. Perturbations of second order are exerted on the convective coefficients and source term of an h2 exponential finite difference scheme proposed in this paper based on a transformation to eliminate the upwind effect of the convective diffusion equation. Four numerical examples including one- to three-dimensional model equations of fluid flow and a problem of natural convective heat transfer are given to illustrate the excellent behavior of the present exponential schemes, the h4 accuracy of the perturbational scheme is verified using double precision arithmetic.

关于中央分隔带护栏立柱基础的探讨

目前高速公路中央分隔带波形梁护栏立柱的实际设置中，普遍存在着由于分隔带地基强度低于压实路基，护栏立柱承载能力偏低，护栏的防护性能达不到设计要求的问题。本文对粘性土地基中立柱的受力情况进行了分析，并对地基为压实土与回填土两种情况进行了对比，给出了中央分隔带中立柱地基的加固方案。

Las sociedades cooperativas de vivienda. Especial referencia al País Vasco

[ES] Son muy diversos los sectores en los que ejercen su actividad las sociedades cooperativas. La sociedad cooperativa de viviendas es una clase específica de dentro de las de consumidores, regulada como una «clase» diferenciada en las leyes, que presenta particularidades que es preciso conocer. Constituyen entidades con un lugar propio dentro del sector inmobiliario con una nada despreciable contribución a la promoción de vivienda. En el País Vasco son en cuantía las más importantes después de las de trabajo asociado. La sociedad cooperativa de viviendas se caracteriza como empresa de participación dentro del sector inmobiliario, en la medida que son los propios usuarios de las viviendas los responsables de la toma de decisiones en la promoción inmobiliaria.

Propiedades eclesiásticas en una ciudad aduanera: los jesuitas en Orduña, 1689-1767

[ES]El colegio de los jesuitas de Orduña, uno de los más tardíos de todo el País Vasco, sigue en su fundación un patrón característico en los casos de mecenazgo indiano: benefactor oriundo, capital consolidado sobre el comercio y el servicio de la Corona, y diseño dirigido desde el otro lado del Atlántico, en este caso desde el Perú. El presente artículo aporta algunas claves sobre esas cuestiones, y ahonda en la formación del patrimonio que la Compañía de Jesús logró reunir en esta ciudad aduanera del Señorío de Vizcaya hasta el momento de la expulsión decretada por el rey Carlos III.

一种新的二维平板分叉流槽的设计

目的 解决平行平板流槽每次实验只能观测壁面培养细胞受一种剪应力作用的问题。方法 作者在平行平板流槽的基础上，首次提出了一种改进后的流槽-二维平板分叉流槽。通过数值模拟，给出了流体作定常流动时，流速和壁面剪应力的分布。结果 结果发现，利用这种二维平板分流槽可以研究壁面培养的细胞在不同大小剪应力作用下的力学行为。结论 该研究结果为流槽的合理设计和使用，并分析剪应力空间分布对内皮细胞的影响有重要实际意义。