柱坐标中弱引力场的活塞问题

本文讨论弱引力场的恒星大气中的活塞问题。特别在柱坐标系中分析了气体动力学过程,外加重力和坐标曲率两者对流场的影响都进行了详细的讨论。 在弱重力的情形下,逃逸速度与气体速度或声速的比为小量。将此比值取为小参数,所有量可展开为此小参数的级数。在柱坐标中,零阶关系给出膨胀流,其中速度和声速减小;一阶关系给出外加重力的影响,使激波强度减弱,使气体内能消耗。在活塞附近,内能的消耗克服外加重力并加速气流;而在激波附近,内能和动能减少、以克服重力。

可变形管流动相似性

生理流动的相似准则因目标而异。本文解决两个问题:(ⅰ)以动脉内血液流动和管壁运动的偶合作用为目标,建立了有限长度可膨胀管内非牛顿流体非定常运动的相似准则;(ⅱ)以阻力-流量特性和流态改变为目标,分析了可坍管定常流动的相似性,实验证明所得结果是正确的。

环向加筋圆柱壳在横向冲击波作用下的动力响应

用一个均匀的单层壳作为“参考”结构,把环筋当作“外载”考虑其效应.利用“残余势”法处理流体和壳体之间耦合效应,导出了无限长、环筋等距分布圆柱壳体在计及中面有伸长和无伸长时,所有模式下的动响应表达式.方程式通过不同程度简化,能得到前人的一些结果.本文计算了两组壳体参数,绘出了相应的曲线,并比较了不同方法的结果.

Asymmetric structure of an isolated flux arch

This paper extends two-dimensional model of symmetric magnetostatic flux arches confined in stratified atmospheres (Zhang and Hu, 1992, 1993) to asymmetric models. Numerical results show that the flux structure is influenced greatly by the boundary condition of magnetic field, the force-free factor, the atmospheric pressure distribution and the position of footpoints (especially the width ratio of outlet to entrance, which differs from symmetric case).

Simultaneous measurement of temperature, density and velocity in gas-flows by modulated photoluminescence

A novel possibility to determine the temperature, density and velocity simultaneously in gas flows by measuring the average value, amplitude of modulation and phase shift of the photoluminescence excited by a temporally or spatially modulated light source is investigated. Time-dependent equations taking the flow, diffusion, excitation and decay into account are solved analytically. Different experimental arrangements are proposed. Measurements of velocity with two components, and temporal and spatial resolutions in the measurements are investigated. Numerical examples are given for N z with biacetyl as the seed gas. Practical considerations for the measurements and the relation between this method and some existing methods of lifetime measurement are discussed.

PEG化磷脂膜在蛋白质芯片表面修饰中的应用

用PEG化磷脂膜修饰蛋白质芯片的二氧化硅表面,通过调节PEG的含量,考察磷脂膜对蛋白非特异性吸附的抑制,以及对蛋白分子固定的影响。结果表明,经过PEG化磷脂膜修饰的二氧化硅表面,可以显著抑制蛋白的非特异性吸附,并通过功能化的PEG分子有效固定配基及其抗体。

高超声速乘波飞行器气动特性研究(英文)

用计算流体力学和风洞试验的方法对以锥导乘波体为基础生成的高超声速乘波飞行器的气动性能进行了研究。结果表明,以马赫数6,攻角4度为设计状态的乘波体,在马赫数5~7,攻角4~6度的范围内,都具有良好的气动特性,升阻比接近4。最后,提出了一个简单的以参考温度方法为基础的粘性阻力分析方法。该方法配合使用风洞试验和计算流体的结果,可以用来验证计算流体中难以计算准确的粘性阻力,也可以用来分析在风洞试验难以直接得到的粘性阻力。对于工程上的粘性阻力分析是一个有用的办法。

La supervisión de la práctica profesional socioeducativa

[Es] La supervisión es uno de los métodos de desarrollo profesional de las profesiones de ayuda, ya que se manifiesta particularmente funcional en las profesiones en las que es importante el manejo de las relaciones: se dirige hacia el desarrollo de profesionales altamente integrados y competentes. Tras la revisión crítica de los diferentes enfoques de supervisión que históricamente se han desarrollado, se presenta un modelo integrativo de supervisión en grupo, que se mueve en la perspectiva crítica de la formación, exponiendo las bases teóricas en que se fundamenta, el desarrollo del proceso y las funciones del supervisor, así como algunas estrategias y técnicas propias de esta supervisión.

Un impuesto singular: el diezmo-señor y la sal en Añana, siglos XVI-XIX

[ES]Cuando a partir de 1564 las salinas de Añana comenzaron a producir para la Corona, sus propietarios se vieron obligados a pagar al rey un tributo anual por el uso de las mueras, admitidas como un ius regalia de la monarquía: el diezmoseñor. Desde entonces, todo el entramado de la fabricación y venta de la sal se organizó en torno a él. En este artículo se analizan algunas de las características de este canon tan singular que se mantuvo en vigor hasta el siglo XX.

Las aportaciones del Condado de Treviño a las instituciones de Vitoria en la Edad Moderna: La Colegial de Santa María y el Hospital de Santiago

Ponencia presentada en I Congreso de Estudios Históricos del Condado de Treviño: 850 aniversario de la fundación de la Villa de Treviño, celebrado los días 1,2 y 3 de junio de 2011 en Treviño (Condado de Treviño)

Niveles de nutrientes y pigmentos fotosintéticos en el Río de la Plata interior (55°-59°W 34°-36°S)

The "Río de la Plata" River is one of the less studied systems of the basin with respect to its biological and ecological aspects. Twenty four and twenty seven surface stations were sample on September 22-23 and November 22-23, 1982, respectively. The section studied is part of the zone called inner "Río de la Plata" River. The discharge was 29.000 m3/s in September and 45.200 m3/s in November. Total phosphorus (PT), total organic nitrogen (NOT), chemical oxygen demad (COT) and total cholrophyll were measured. Dissolved oxygen (DO), turbidity (TURB), pH and electrical conductivity (K20) were also measured at the surface with a HORIBA U7 sensor on November 1982. PT was 72-208 mg/m3 and 66-205 mg/m3 in September and November repectively; the higher values were near the Argentinian coast and the outer zone. NOT was 33-106 µM and 49-117 µM and CHL was 1.4-5.8 mg/m3 and 1.3-9.4 mg/m3. TURB was between 44 and 240 NTU in November; the maximun value were obseved in the central zone. Steep K20 gradients were found near both coast. The reduced organic carbon load into the lower and external part of the "Río de la Plata" River was estimated. (Document contains 40 pages.)

About the limits of metalanguage: An essay on the modelisation of Latin grammatical lexicography

[EN] Progress in methodology in specific fields is usually very closely linked to the technological progress in other areas of knowledge. This justifies the fact that lexicographical techniques have had to wait for the arrival of the IT era of the last decades of the 20th century in order to be able to create specialised electronic dictionaries which can house and systemise enormous amounts of information which can later be dealt with quickly and efficiently. This study proposes a practical-methodological model which aims to solve the grammatical treatment of adverbs in Ancient Latin. We have suggested a list of 5 types, in a decreasing order from a greater to lesser degree of specialisation; technical (T), semi-technical (S-T), instrumental-valued (I-V), instrumental- descriptive (I-D), instrumental-expository (I-E).