汽车空调制冷系统中应用R407C的分析

本文对混合工质R407C与R12的物理和热力性质进行了比较分析，并针对汽车空调制冷系统的特点，对两种工质在变工况下进行了制冷系统的理论循环分析，阐明了在汽车空调制冷系统中使用R407C的可行性。     

Metal micromolding: further experiments and preliminary finite element analysis

We report results of instrumented microscale compression molding experiments on Al with Ta mold inserts. The Ta inserts have high-aspect-ratio microscale structures fabricated by micro-electrical-discharge-machining. These microscale structures were further surface engineered by electrochemical polishing, followed by deposition of a conformal amorphous hydrogenated carbon based coating. The molding response of Al, in terms of molding force versus insert displacement, was measured in situ with a high-vacuum, instrumented, compression molding apparatus, and rationalized with a simple model on the mechanics of molding. Molding response was further studied numerically through finite element analysis.     

玻璃与金属封接用杜美丝

利用ＡＥＳ、ＷＤＳ和ｘ－射线衍射等方法，研究了杜美丝表面层、铁镍芯与覆铜层界面的微观结构与特性。结果表明：良好的表面层应由Ｃｕ２Ｏ和非晶态的硼砂构成；玻璃与杜美丝的润湿性决定于表面层的净化程度和构成及加热条件。     

On modeling the design of cellular manufacturing systems

A new optimization model is discussed for the design of cellular manufacturing systems. It is based on an integer programming formulation that updates some other models by eliminating redundant machine assignment and cost coefficients dependent on cell configuration. To reduce computational burdens, a simplified integer programming model and a decomposition algorithm are proposed. Several computer solutions were performed to evaluate the performance of the new model. The computational results are discussed.     

Cr/SiO_2界面还原反应研究

利用俄歇电子能谱研究了Cr／SiO2薄膜在热处理过程中的界面扩散反应机理、界面反应动力学过程及界面反应产物。研究结果表明，Cr／SiO2体系的界面还原反应主要是Cr与SiO2的反应，其还原反应产物是CrSix和Cr2O3物种。界面还原反应的速度与反应时间的平方根成正比，其界面还原反应过程受Cr向SiO2层的扩散过程所控制，界面还原反应的表观活化能为72．5kJ／mol（约0．75eV）。     

Experimental studies of high frequency jet ventilation improved by enhancing expiratory turbulence

A 43-year-old male and a 39-year-old male presented with multiple pituitary adenomas with two distinct histological types. The first patient who had multiple endocrine neoplasia type 1 had developed acromegaly due to a growth hormone-releasing hormone (GHRH)-producing pancreatic tumor. Both plasma GHRH and growth hormone (GH) levels decreased to normal after resection of the pancreatic tumor. However, the plasma GH level gradually increased again and magnetic resonance imaging revealed pituitary adenoma formation. Histological examination revealed two different histological types of pituitary adenoma: GH cell adenoma and null cell adenoma. The second patient, with no such genetic condition, had a non-functioning pituitary adenoma. Histological examination revealed two different histological types of silent GH cell adenoma and silent gonadotroph adenoma. Careful histological examination is required to exclude the possibility of multiple pituitary adenomas.     

Experimental studies of new ductile coupling beams and multi-storey shear walls

The span-depth ratios of coupling beams to interconnect shear walls are generally small, so that brittle shear failure may occur and lead to reduced ductility. In order to improve the ductility of coupling beams for earthquake loading, a new type of ductile coupling beam is proposed in this paper. Along the middle depth of this beam, a slit through the entire thickness (a narrow hole) near each end and two lateral keyways along the remaining middle part of the span are made. The reductions of the stiffness under service load and the ultimate carrying capacity of the beam due to the weakening mentioned above are small and the ductility is greatly increased. Tests of 4-storey walls interconnected by coupling beams in three different constructions (monolithic beams, beams with a through-slit and new-type beams) indicated that shear walls with the new coupling beams possess the best aseismic behaviours under cyclic loading. The proposed new coupling beam has been used in a high-rise building.