Bone replacement in head and neck surgery: a biocompatible alternative

BACKGROUND: Defects in the skull have presented difficult reconstructive problems. Recently glass-ionomer cement and preformed. implants have been used to repair bony defects in the skull base and in cranio-facial surgery. Three patients are reported to illustrate possible applications for this new material. METHODS: Ionocap cement and Ionoroc-skull standardized implants have been used. The cement is available as a two component blister pack. When mixed and blended a gel is produced which can be worked for approximately 5 min before hardening. It can then be contoured and drilled to the required shape. The resultant material is biocompatible and biostable, is non-toxic and permanently bonds to bone with no increase in temperature or shrinkage. RESULTS: The material has been used to fill the temporal defect left by transplantation of the temporalis muscle for oral reconstruction, the anterior and lateral walls of the maxilla and following craniofacial resection, the posterior wall of the frontal sinus and anterior skull base. CONCLUSIONS: Three patients with different reconstructive problems have been presented to illustrate the use of an alloplastic material that has a tensile strength similar to bone and firmly adheres to it. The material was found to be safe and easy to use. All three patients have now been followed for 12 months with no adverse affects.     

缝洞型碳酸盐岩油藏水动力学模拟研究

塔河油田缝洞型油藏以溶洞、裂缝为主要储运空间，缝洞非均质性很强，其流体流动机理和含水率变化特征与一般砂岩油藏区别较大。基于管流理论建立了一种新的流动模型，并分别模拟了弹性开发和注水开发时缝洞型定容油藏的开发特征和含水率变化特点。该研究对于认识缝洞型油藏流体流动机理具有一定的借鉴意义。     

A priori ordering protocols to support consensus-building in multiple stakeholder contexts

In a complex social, political, economic, technological, and/or environmental context, corporate, military, government, and other organizations are often faced with collective decision-making situations. The rationale for group decision exercises is that the judgment of many will usually prove superior to the judgment of one. However, it has been shown that collective decision exercises are often highly dependent on matters of perspective, values and opinion, all of which - being essentially subjective in nature - are beyond the reach of existing formal decision technology. Furthermore, it can be expected that many collective decision exercises - particularly those of strategic import - will not lend themselves to the quantitative analysis instruments that have long dominated the management and decision science repertoire. This does not, however, mean that they must remain entirely and forever outside the bounds of scientific rationality. The ordering protocols which are currently available do not have enough technical mechanics to be relied upon to bring us to any satisfying resolution of a priori disputation. Hence, we propose an a priori ordering reference model that might support consensus-building in a multiple stakeholders context. In order to detect whether the subjective arguments are products of proper reasons or merely instances of raw rhetoric and to suggest how any logical or syntactical flaws might best be repaired, we propose logical ordering facilities and protocols for integrating procedural and instrumental provisions for a group-decision process with two lines of technical innovation: the superimpositional ordering function and the logical ordering support facilities.     

高层建筑擦窗机的选型与建筑设计要求

论述了擦窗机产品的发展现状与安装的必要性；在擦窗机产品的分类与选型考虑因素的基础上，对目前我国擦窗机的型式及其配置做了比较系统的介绍；最后还简单列举了几种擦窗机的布置方式。对高层建筑在建筑设计时就考虑擦窗机的安装型式，结构设计的承载要求等，提供了较为实用的参考。     

碱土金属氧化物催化氧化异丙苯反应研究

考察了碱土金属氧化物CaO、MgO和SrO在催化氧化异丙苯合成过氧化氢异丙苯 (CHP)反应中的性能。3种催化剂的活性顺序为 :CaO >MgO >SrO。采用Hammett指示剂分别表征了碱土金属氧化物的碱强度。碱强度H-=15 0～ 18 4的碱性中心有利于异丙苯过氧化合成CHP反应。采用红外光谱分析了异丙苯在MgO、CaO催化剂表面的吸附态。异丙苯通过异丙基叔碳原子上的氢原子与CaO催化剂表面碱中心发生化学吸附 ,弱化了异丙基叔碳原子上的C—H键 ,从而有利于催化异丙苯氧化合成CHP的反应。MgO与异丙苯的异丙基叔碳上的氢原子的相互作用弱于CaO与异丙苯的异丙基叔碳上的氢原子的相互作用 ,使MgO催化异丙苯氧化的反应活性低于CaO催化异丙苯氧化的反应活性     

连铸坯的液芯轧制

研究了连铸坯的液芯轧制，并结合日本川崎永岛厂的实例，证实了连铸坯液芯轧制的可行性，指出了钢锭和连铸坯液芯轧制的区别，及如何制造压应力状态，推导了坯壳应力与轧辊直径压下量，坯壳厚度的关系，并提出了用振摆式轧机实施连铸机液芯轧制的方案。     

高温超导红外探测器的电极工艺探讨

介绍了高温超导红外探测器电极材料的选择和制备。选用先蒸、后蒸金，再合金化的电极工艺。芯片装配成器件后，器件性能稳定，膜层牢固，接触电阻小。     

Activity Interaction Coefficients of Si in Cu-Ti-Si Melts at 1550℃

Activitibs of Si in binary Cu-Si and ternary Cu-Ti-Si melts were measured at 1 550℃ by using a method of chemical equilIbrium between gas and liquid. The activity interaction coefficients of Si in the melts have been determined from the experimental data (lny = -5.69. s = 6.69. P2: = -26.22. E; =-43.96) and activity interaction coefficients of Ti in binary Cu-Ti melt at 1550℃ has been estimated from Sommer's data based on the regular solution model (lny =-1 .10. : = 2.95.p:=-2.10).     

ConcurrentC语言在分布式系统上的一种高效实现

本文介绍了ＣｏｎｃｕｒｒｅｎｔＣ语言在一分布式系统上的实现。该实现使用了不同于预编译法的编译器的构造方法，同时将Ｃｏｎｃｕｒｒｅｎｔ Ｃ语言中的进程实现为ＵＮＩＸ进程中的用户级线索，是ＣｏｎｃｕｒｒｅｎｔＣ语言在分布式系统上的一种高效实现。