含RDX的硝胺丁羟推进剂能量特性研究

采用最小自由能平衡流法对RDX/AP/Al/HTPB推进剂能量特性进行了理论计算。通过BSF165mm和BSF315mm发动机点火试验,研究了RDX含量、燃烧室压强对RDX/AP/Al/HTPB推进剂能量特性的影响规律。根据理论计算和发动机试验结果,对配方进行了优化设计,与某型号760mm全尺寸发动机的实测结果对比,其实测比冲高达2428.1N·s·kg-1(pc=6.86MPa),验证了RDX的加入对RDX/AP/Al/HTPB推进剂比冲有较突出贡献。     

A finite element parametric study on the mechanical properties of J-shaped steel hysteresis devices

The present paper discusses the mechanical properties of J-shaped steel hysteresis devices, abbreviated to “J-dampers”, interposed between the upper structure of a spatial structure and its substructure. The mechanical properties of a J-damper, which are characterized by its key geometrical and material parameters, are evaluated through parametric analyses using an in-house Finite Element program. The hysteresis behavior of a J-damper is also modeled by a bi-linear elasto-plastic hysteresis model with the strain-hardening effect. Its elastic stiffness, yield strength and dimensionless hardening ratio, which are expressed as functions of the parameters, are formulated on the basis of mathematical models and the results of parametric studies. Finally, some remarks relevant to the application of the proposed hysteresis model are made for the design of the J-damper.     

Analysis and visualisation with host-based software – The features of STNAnaVist™

This article is based on experiences with data and text mining to gain information for strategic business decisions, using host-based analysis and visualisation (A/V), primarily in the field of patents. The potential advantages of host-based A/V are pointed out and the features of the first such A/V software, STN^®AnaVist™, are described in detail. Areas covered include the user interfaces, initial set of documents for A/V, data mining, text mining, reporting, and suggestions for further development.     

热强钛合金BT25组织与性能

介绍了前苏联航空发动机用热强钛合金（或高温钛合金）BT25的发展概况，并对BT25合金的成分特点、热处理强化优点等做了进一步阐述，给出了退火状态下的物理性能，在说明热强钛合金微观组织与力学性能关系的基础上给出了BT25合金的各种力学性能。     

Control of structure and tack properties of acrylic pressure‐sensitive adhesives designed by a polymerization process

Free radical emulsion polymerization of methyl methacrylate (MMA) and 2‐ethylhexyl acrylate (EHA) results in the synthesis of pressure‐sensitive adhesives (PSAs) with good tack properties. Management of both the copolymer composition and the polymerization process allows one to control the behavior of the PSA. Semicontinuous (SC) processes create polymer particles whose instantaneous composition is close to that of the feed particle The SC Mixture process (continuous feeding with comonomer blends) affords nearly homogeneous latex particles and PSA films. The SC Gradient process (separate feedings at inversely varying rates) affords heterogeneous particles and films. The Batch process leads to somewhat heterogeneous films, but the hard (MMA‐rich) microdomains are made compatible with their soft (EHA‐rich) matrix because of the assumed formation of tapered‐type copolymers. Tack measurements indicate the importance of the particle and film structures. Too much hardness or softness leads to unacceptable lacks of adhesion and cohesion, respectively. Homogeneous structures prove adequate, but their tack properties collapse with rising temperature. Heterogeneous structures, with extensive phase segregation, prove unsatisfactory because they lack adhesion and cohesion. Finally, the association of well‐balanced composition and compatible heterogeneity is the criterion for suitable PSA behavior. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 89: 2749–2756, 2003     

五号桩—长堤地区沙河街组砂体储集性及控制因素研究

沙河街组是沾化凹陷东部五号桩-长堤地区重要的储油层系，主要目的层段为沙三段和沙二段。沙三段和沙二段主要发育有浊积扇、水下冲积扇和滩坝沉积体系，在浊积扇、水下冲积扇中发育辫状水道、扇中前缘、辫状水道间以及扇根、扇缘等沉积微相类型，其中辫状水道、扇中前缘砂体物性好，原生孔隙及次生孔隙均较发育，辫状水道间以及扇根砂体物性较差。其储集特征主要受岩性、沉积微相、成岩作用等因素控制，结合该地区实际情况，将沙二段、沙三段储集层划分为好、中、差3种类型。图4表1参7     

CONSTITUTE AND PROPERTY OFα-Ti AFTER HYDRIDING TREATMENT

研究了氢化处理对退火α-Ti 板材的组织、结构及性能的影响。α-Ti 在室温出现两种结构的氢化物:有序的fctγ相(TiH)和fccδ相(TiH_2)。分析了用X 射线衍射只查觉到δ相的原因。氢化物的数量及形态影响除氢后基体的晶粒组织。控制氢含量可以改善拉伸性能及疲劳性能。     

关于图形识别的视觉反应的研究

文中叙述了以实验的方法所进行的人工智能视觉领域的基础性某些图形识别的研究工作。在实验中将一些字母和图形按拓扑结构和几何性质分组。试图寻找人类视觉在图形识别过程中的一些规律，运用了模糊数学中的综合评定法。     

进口与国产高强度耐磨钢板的组织及力学性能

观察了进口、国产高强度耐磨钢板的组织，测试了它们的力学性能及耐磨性能。结果表明，国产准贝氏体钢耐磨板具有良好的强韧性配合，耐磨性能超过进口耐磨钢板，能够替代进口板作为高强度耐磨板。