An investigation of the unstable region for dense phase conveying in sliding bed flow

For fine powdered materials, capable of being conveyed in dense phase, a conveying region exists in which instability in flow and pipeline blockage can occur if the pressure gradient available is insufficient to maintain a minimum value of solids loading ratio. A reduction in material flow rate can also lead to pipeline blockage in this region. Conveying trials under-taken with cement are used to illustrate the nature of the problem.     

导磁不锈钢毛的结构化研究

研制了一种新型的结构化钢毛——胶结钢毛。和传统的普通钢毛相比,胶结钢毛具有很强的结构刚度和很低的钢毛流失量;同时,对高岭土有较高的除铁效率。     

The Change of Body Temperature During Convective Drying of Cube-Shaped Apple Pieces

When using the convective drying method, the mass transfer between drying air and moisture diffusion of the material is very important. The moisture moves inside the material because of the volume change caused by the increased temperature. This movement is additionally affected by the texture of the material. According to the research dealing with colloid capillary porous texture of vegetables and fruit, the humidity migration inside the material occurs in both fluid and steam condition at the same time. This migration is stimulated by the heating and decreasing humidity along with the flow. In this research, winter varieties of apples (Jonathan, Golden Delicious, and Idared) were studied by heating of a 20 × 20 × 20 piece of apple with a thermocouple in it. On the basis of the measurements it can be stated that for the fruits with a high percentage of moisture (75-90%), when making the drying condition, the moisture gradient is influenced by the fractured cells of the cut area. It was found that the variety of apple is very important in relation to the heating and water loss gradient. According to the results, the wet volume change due to the heating highly influences the water loss. The models that describe the temperature of the material have a connection with the water loss.     

用高梯度磁场净化轧钢废水

通过用高梯度磁场处理热轧厂废水的试验,得到了在试验条件下浊度(水中不溶物的含量)和铁的去除率,确定了最佳净化条件.在此条件下,能够有效去除废水中的不溶物和铁,经过处理的水质达到了工艺循环水的水质标准.     

梯度功能材料的研究评述

叙述了梯度功能材料（FGM）的概念，结构特征以及制备方法。评述了梯度功能材料研究的现状，提出了将梯度功能材料与纳米材料、梯度功能材料与智能材料系统地结合，将是21世纪材料科学发展的主导方向之一。     

制备方法对复合触头材料导电特性的影响

根据复合材料制备方法的各自特点 ,建立了计算复合触头材料电导率的三维单元网络模型。应用该模型研究了制备方法对材料电导率的影响 ,并与测量值进行了比较。结果表明了这种模型的可行性。     

Magnetic separations in biotechnology—a review

Magnetic separation technology has a broad range of potential applications in both small and large scale biotechnology. This review considers a selection of magnetic techniques and their possible uses.     

Pulsed field gradient n.m.r. measurements and theoretical interpretation of the self-diffusion of polystyrene in solution

The self-diffusion coefficients of polystyrene dissolved in C₆D₆ were measured by means of pulsed field gradient n.m.r.. The dependence on the molecular weight was of the power of -2 in accordance with the reptation model. The concentration dependence was theoretically calculated within the blob concept which shows that in the crossover region the self-diffusion coefficient is determined only by the blob dimensions and the monomeric friction coefficient is constant. The calculated concentration dependence agrees well with that observed by the authors.     

高温用（SiC—AlN）Mo功能梯度材料的加工

讨论了热屏蔽用（SiC－AIN）／Mo功能梯度材料的粉末冶金加工。利用钼作为基体材料，以承担结构强度和连接可能性。根据在1000K温差内的完全热传递，研究了组分配置的设计，并且以最佳的组分配置成功地加工出了（SiC－AIN）／Mo功能梯度材料的烧结坯料。     

梯度折射率棒中传播的高斯光束轨迹解析解及其存在条件的讨论

本文提出光束轨迹方程的一般解，导出解析解的存在条件，推广了文献［１］的光线传播理论，文中以一特定梯度折射率棒为例，讨论了高斯光束在棒中的传播特性。