离线电子现金系统安全性研究

如何安全地实现网上支付功能, 并保证交易各方的安全保密, 是电子商务深入发展所必须研究的重大课题。离线电子现金支付系统是电子支付最理想的方式之一。就提高离线电子现金系统的安全性进行了深入研究, 全面分析了其面临的风险, 并根据通用准则的思想提出了一组与具体实现无关的安全要求。     

基于屈服失效准则的薄壁容器试验压力系数

应用基于概率统计理论的可靠性设计方法,根据屈服失效准则,分析了在最苛刻的试验压力条件下,按标准设计的薄壁内压容器可接受的屈服强度初始可靠度范围。从控制薄壁内压容器在不同工况下最小初始可靠度的角度,对其试验压力系数进行了探索。     

科技论文汉译英的选词准则

阐述了科技论文的科学语言的本质特点，讨论了英语的词源与学术语言选词的历史原因，探讨了科技论文汉译英时具有科技味的选词原则及其规律，以及与科学语言之间的相互关系。     

Criteria to predict the embrittlement of polycarbonate

A direct correlation is found between the time evolution of the yield stress in unnotched tensile bars and that of the impact energy measured using notched tensile bars. In both cases a master curve can be constructed with an Arrhenius type of shift function, using the same activation energy. Combining these experimental findings with numerical simulations lead to a maximum hydrostatic stress as a criterion to predict the onset of failure, . Where aging kinetics is not dependent on the polymer’s molecular weight, embrittlement is, and for higher molecular weights a higher is found. Moreover, for high polymers we observe a more stable craze extension and crack propagation after cavitation, causing the computed impact energies to underestimate the experimental ones for all but the lowest molecular weight polymers. Because the maximum in hydrostatic stress under the notch, σ^h, increases with the polymer’s age, defined by the value of the state parameter S_a, and given the proportionality between S_a and the yield stress, σ_y, an alternative failure criterion is proposed which is a molecular weight dependent critical value of the evolving yield stress, σ_y,c. It predicts a product’s increased sensitivity to damage under the influence of progressive aging as enhanced by temperature.     

原油对泡沫稳定性的影响

本文综述了泡沫驱油过程中原油对泡沫稳定性的影响。运用热力学方法分析了原油与泡沫相互作用的强弱，将原油存在下泡沫的稳定性与液膜数相关联。微观模型观察结果表明，原油对泡沫稳定性影响的程度与原油性质有关，一般来说泡沫在轻质原油存在下的稳定性小于在重质原油存在下的稳定性。     

Integrated systems II: Multi-tier interfaces for integrating families of systems

Of critical importance is the design of the man-machine interfaces for general rule based systems. They must serve (i) as user-friendly interfaces for different classes of users for different applications and (ii) to invoke service components in integrated packages without interrogating users. These objectives are achieved with a multitier interface design whose two parts, the Interactive User-Friendly Interface (IUFI) and the System Interface (SI), communicate with each other via commonly used notational systems and can be invoked independently of each other. The user-friendly interface, which is uniquely designed for each user discipline, passes information to the SI. The SI does not change for new IUFI designs and it can be invoked by other rule based systems without interrogating users.Here the requirements for the IUFI and SI parts are identified, four different designs of multi-tier interfaces are given and two applications are described. Also included are guidelines for designing user friendly interfaces.     

浙东南萤石型金矿的发现及其找矿意义

本文以新发现的浙东南某萤石——金矿带为例, 对其成矿地质特征、成矿远景、找矿标志和找矿方向等问题, 进行了初步研究与总结。     

纸盒结构参数化设计及让刀问题的处理

介绍了纸盒结构参数化设计的意义、方法，以及对加工中的让刀问题的处理措施。     

Environmental acceptability of beneficial use of waste as construction material--state of knowledge, current practices and future developments in Europe and in France

Since a decade, numerous industrial and public initiatives have been launched in order to make knowledge, practices and mentalities evolve in relation to the acceptability of using waste instead of raw material as construction product. The objectives of these initiatives have been to evaluate current practices and to make new solutions and beneficial use channels emerge. At the same time scientific and standardisation communities have developed methodologies and tools to fit with the assessment needs expressed by industrialists and public decision-makers. In spite of that, some factors, some of them being cross-linked, make the perpetuation of beneficial use channels or even the concretisation of research projects difficult. To cope with this situation, in the framework of sustainable development applied to natural and alternative material, the French Directorate of Road has launched a project aiming at providing public contracting authorities with a document gathering both technical and environmental requirements that they can prescribe in public market tender calls to promote the use of waste and out-of-technical-specifications-material. This paper deals with the presentation of this project focusing more specifically on the approach to assess both technical and environmental acceptability of waste and out-of-technical-specifications-material to be used as alternative material in road construction in France. The current European situation is first described and this paper finally discusses briefly the other key aspects--than environmental acceptability--that have to be taken into account to succeed waste beneficial use.