超低温数码涡旋热泵技术

本文阐述了一种新的制热技术——谷轮超低温数码涡旋热泵技术（Copeland Digital Scroll Heating）。该技术以数码涡旋技术为基础。在低温环境下（〈0℃）提供热量以达到舒适一直都是一种挑战。可选的制热技术——锅炉制热、电阻加热、加大压缩机、利用变频器超速运转等方法如今都在应用,但是没有一种方法达到高效率。超低温数码涡旋热泵技术使得热泵能在低温环境下可靠地运行,并能以最节能方法提供额外的热量。本文说明了超低温数码涡旋热泵技术的工作原理、在空调系统中的性能以及应用的灵活性。本文也探讨了一些需要考虑的技术问题来设计和优化这项技术在空调系统中的应用。     

渤海湾盆地演化特征与构造样式

应用勘探地震信息，分析研究了渤海湾贫地从中、上元古代、古生代、中生代到新生代，地质发展历史演化特征，并根据临清地震剖面显示，探索该区在演变历史进程中地壳层厚度的民应力环境转化的规律；论述了盆地在３次断陷－坳陷期形成的力学机制；在综合论述的基础上，归纳总结出盆地内有７种类型盖层构造特征的展布样式。文章最后概述了盆地成油成藏条件与规律并强调进一步加强古生界油气藏勘探与研究的重要意义。     

A three-node triangular plate bending element based on mindlin/reissner plate theory and mixed interpolation

A new three-node triangular plate bending element, MT3, is presented for linear elastic analysis. MT3 is obtained by separate interpolation of transverse displacements and section rotations, and also of the transverse shear strains. The key to the MITC family element is a proper assumption of strain fields, and in this paper the torsional shear mode present in a standard displacement-based element by one-point reduced integration is exactly incorporated to form the stiffness matrix with two other constant shear modes. The procedure renders the element free of any locking phenomena. Low-order MITC family elements are also compared to the proposed element. A detailed formulation of the plate elemenet is given, and several example solutions are presented that demonstrate the superior predictive capabilities of the element.     

大庆油田高含水后期高效调整井研究

本文通过对油田三个加密井网试验区的资料分析,总结出了厚油层高效层存在的地质条件。并结合油田目前确定高效井的情况,对高效井的油层条件、开采条件、层系组合和井网部署进行了论证。对油田进一步寻找高效井将会有一定的指导意义,对确保大庆油田稳产有重要作用。     

厚煤层无煤柱沿空留巷围岩“卸压-支护”机理

为确定色连二矿厚煤层无煤柱开采沿空留巷时，巷道围岩切顶卸压及支护机理参数，采用理论分析、数值模拟、工程类比及工业试验的研究方法对留巷相关参数进行研究，研究表明：理论分析确定沿空巷顶板悬臂梁越短，顶板压力越小，留巷段稳定性随围岩切顶高度增加而增加，切缝孔窥视确定装药结构为3-2-2-2-2-1-0时，顶板围岩能够形成切缝面，切缝效果较好；数值模拟及现场工业试验研究表明，留巷段采用深浅部围岩”分层支护参数支护时，顶板锚索锚固围岩稳定，工作面动压影响留巷段距离为270.4m，巷道顶底板最大变形量为628.92mm，满足安全高效生产需要，研究为同类型地质条件矿井提供参考。     

Scanning electron microscopic observations on deembedded biological tissue sections: Comparison of different fixatives and embedding materials

Conventional plant histological specimens fixed in formalin-acetic acid-alcohol, chromic acid-acetic acid-formaldehyde, or glutaraldehyde-osmium and embedded in either paraffin or plastic are examined as possible rapid methods for providing an alternative image of cellular structure by using scanning electron microscopy. Using the mitotic figures of actively growing onion root tips as a study specimen, the organization of the nucleus and spindle apparatus is reasonably well preserved as compared with isolated mitotic spindles and studies of mitosis in endosperm tissue. Relief of internal structure in this technique is obtained through the coagulant nature of the fixative. Used judiciously, this technique can reveal aspects of the three-dimensional nature of internal tissue structure that may otherwise be difficult to discern.     

TiN技术在控轧低碳Nb—V钢中的应用

文章简述了TiN技术在控轧低碳Nb—V钢中的应用效果，并通过试验论述了该技术对钢板机披性能所起的良好作用。     

太钢不锈钢板材的生产现状和发展

９０年代太钢的不锈钢生产得到了迅速发展，不锈钢钢材从１９９０年的５．２３万ｔ增加到１９９９年的１４．８５万ｔ；文中概述了太钢近年来不锈钢在生产工艺技术及质量方面的进展情况，提出了今后的发展前景。     

温度系数为±50×10-6/℃的厚膜电阻浆料

研究1种温度系数为±50×10     

Sling-shot buckling of composite structures under thermo-mechanical loading

An overview, unification and review of the mathematical models, stability criteria and critical parameters for two types of structures, patched plates and layered shells, subjected to uniform temperature change are presented. Results of numerical simulations based on analytical solutions are presented and critical behavior is reviewed and compared. In each case, a transverse loading parameter is seen to force the system. For both types of structure, the loading parameter is dependent on both the temperature and the membrane force, and a critical membrane force and critical temperature are identified. When the corresponding critical temperature is achieved, both types of structures considered are seen to exhibit sling-shot buckling, an instability in which the structure dynamically slings from equilibrium configurations associated with deflections in one direction to those associated with deflections in the opposite sense. Conclusions are drawn and explanations are given as to the physical reasons for this phenomenon.