基于软件体系结构的Web应用自适应

随着互联网的迅速发展,Internet上的Web应用大量涌现.然而传统主要依靠管理人员人工配置和维护系统的方式由于不断变化的环境和需求而显得有所不足.本文在相关工作的基础上,提出一种基于软件体系结构构建自适应Web系统的技术方案,该方案具有非侵入式设计和自适应相关组件具有可恢复能力的特点.同时,本文也实现了一个自适应系统原型来说明这个方案及其效果.     

基于EIGamal加密算法的匿名叛逆者追踪方案

基于离散对数的EIGamal加密算法体制，提出一种匿名的叛逆者追踪方案。在此方案中，广播信息通过对称加密算法加密后广播给用户，而加密使用的会话密钥是在注册用户通过匿名身份验证后，通过数据提供商发送的数据头传送给用户。由性能分析可知，该方案不仅具有用户的匿名安全性、可撤销性与可恢复性的特点，还能够抵抗线性组合攻击。     

Fault recoverability analysis of switched systems

This article provides an approach to evaluate the fault recoverability of switched systems (SS) under given energetic constraints. Such evaluation reveals the capability of the SS to tolerate the worst faults over a prescribed set under possible energy constraints. The evaluation is achieved by using the smallest eigenvalue of a proposed ‘switched-system controllability Gramian’. Simulation results about a longitudinal flight control process example are presented to show the effectiveness of the proposed method.     

汪沟煤矿9号煤层可采性分析

通过井下实地调查,综合分析了汪沟煤矿9号煤层原始沉积厚度、后期煤层自燃、下伏10号煤层开采引起冒落综合影响,导致9号煤层不可采。     

Study on full－length recoverable resin－metal bolts

The paper introduces a kind of full-length recoverable resin-metal bolts, expounds its structural principle and stress features, and gives some instances in laboratory tests and underground tests. The results show that full-length recoverable resin-metal bolts can be used for supporting the walls of class I - lU mining gateways, that the anchoring force is 50 kN or so, and that the recoverability rate is more than 80%, thus the supporting effect is better than that of split-set bolts.     

Folding at the Microscale: Enabling Multifunctional 3D Origami‐Architected Metamaterials

Mechanical metamaterials inspired by the Japanese art of paper folding have gained considerable attention because of their potential to yield deployable and highly tunable assemblies. The inherent foldability of origami structures enlarges the material design space with remarkable properties such as auxeticity and high deformation recoverability and deployability, the latter being key in applications where spatial constraints are pivotal. This work integrates the results of the design, 3D direct laser writing fabrication, and in situ scanning electron microscopic mechanical characterization of microscale origami metamaterials, based on the multimodal assembly of Miura‐Ori tubes. The origami‐architected metamaterials, achieved by means of microfabrication, display remarkable mechanical properties: stiffness and Poisson’s ratio tunable anisotropy, large degree of shape recoverability, multistability, and even reversible auxeticity whereby the metamaterial switches Poisson’s ratio sign during deformation. The findings here reported underscore the scalable and multifunctional nature of origami designs, and pave the way toward harnessing the power of origami engineering at small scales.     

一种基于随机序列的公钥叛逆者追踪方案

基于离散对数困难问题,利用随机序列提出一种公钥叛逆者追踪方案。该方案采用多项式与过滤函数来构建,当缴获盗版解码器时,只需通过一次输入输出即可确定叛逆者。若需要撤销或恢复多个叛逆者时,其能在不更新其他合法用户私钥的前提下,实现完全撤销多个叛逆者或完全恢复已撤销用户。性能分析证明,该方案不仅存储、计算和通信开销低,还具有完全抗共谋性、完全撤销性与完全恢复性以及黑盒追踪的特点。     

离子液体支载金属催化剂的研究进展

从催化剂的回收利用性能及催化活性的角度出发,综述了近年来离子液体支载金属催化剂应用于关环反应、氧化反应、氢转移反应、共聚反应和偶联反应等领域的实验及理论研究进展,指出采用离子液体支载可以调变金属催化剂的溶解度及反应活性。     

费伽罗TGS－813型气敏器件的特性研讨

ＴＧＳ－８ｌ３型可燃性气体敏感器件是日本费伽罗（ＦＩＧＡＲＯ）公司生产的，对以烷类气体为主的多种可燃性气体有良好敏感特性的广谱型敏感器件。该器件灵敏度适中，响应与恢复特性好，初期恢复特性快，长期工作稳定性、重现性、抗环境气氛影响及抗温湿度影响等性能均优，系高质量、高可靠性的气敏器件，广泛地应用于各种报警装置。本文将从实际应用出发，对其特性进行研讨。     

Rapid-Fabricated and Recoverable Dual-Network Hydrogel with Inherently Anti-Bacterial Abilities for Potential Adhesive Dressings

To satisfy the ever-accelerated demands for advanced engineering biomaterials with excellent physicochemical properties, injectable and recoverable dual-network (DN) hydrogels based on poly(l -lysine)-graft-4-hydroxyphenylacetic acid (PLL-g-HPA) and Aga are constructed by simply mixing PLL-g-HPA/HRP and PLL-g-HPA/H₂O₂ in Aga through enzyme-catalyzed cross-linkage of PLL-g-HPA and temperature-adjusted sol-gel transition of Aga. The recoverable and injectable performances of hydrogels are attributed to the reversible sol-gel transitional feature of Aga and enzymatically cross-linked reaction of PLL-g-HPA. DN hydrogels have fast and adjusted gelation time, connective pore structure, superior formability, and good biocompatibility. The helically structural Aga network endows the hydrogels with good mechanical strength and superior stability in extreme condition. Schiff-base effect between amino in skin tissues and carbonyl formed by the oxidation of phenol groups in hydrogel imparts the hydrogels to promising tissue attachment. Bursting pressure assay illustrates that the bursting pressure (34.5 ± 2.4 kPa) for 13.6% DN hydrogel is much higher than arterial blood pressure (16 kPa). The incorporated cationic PLL-g-HPA gives the hydrogels remarkable antibacterial ability, which effectively prevents the bacterial infection. In conclusion, the DN hydrogel with good cytocompatibility, inherently antibacterial ability, tissue adhesion, and excellent stability in extreme environment is probably able to become a promising candidate as potential wound dressings.