红外半实物仿真系统中激光型红外投影仪的研究与进展

在动态红外景象生成系统中 ,红外投影仪是最关键、难度最大的部分。它的技术特点决定了景象生成器的性能。目前 ,悬浮电阻阵列和激光阵列是最具有发展潜力的前沿技术。由于激光技术的快速发展 ,激光型投影仪的发展也因此具有强劲的势头和宽广前景。文章介绍了激光型红外投影仪的应用、研究和发展趋势 ,并重点讨论了基于光纤的激光红外投影仪技术。     

论开发农村石油市场

由于历史原因，对农村石油市场开发力度不够。随着农村石油市场需求的不断增加，农村石油市场亟待开发，开发农村石油市场的思路是：布网设点，邀社会加油站加盟，实行加油站连锁经营。     

中央空调系统的化学清洗

以某医院的中央空调系统为例简要介绍了空调冷冻水系统和冷却水系统的工艺流程和清洗过程以及空调日常保养管理的重要性。     

A Low-Cost RFID Authentication Protocol Against Desynchronization with a Random Tuple

Radio frequency identification (RFID) technology will become one of the most popular technologies to identify objects in the near future. However, the major barrier that the RFID system is facing presently is the security and privacy issue. Recently, a lightweight anti-desynchronization RFID authentication protocol has been proposed to provide security and prevent all possible malicious attacks. However, it is discovered that a type of desynchronization attacks can successfully break the proposed scheme. To overcome the vulnerability under the desynchronization attacks, we propose a low-cost RFID authentication protocol which integrates the operation of the XOR, build-in CRC-16 function, permutation, a random tuple and secret key backup technology to improve the security functionality without increasing any cost than the utralightweight protocols. The analysis shows that our proposal has a strong ability to prevent existing malicious attacks, especially the desynchronization attacks.     

热轧钢管芯棒石墨润滑剂

介绍了用于烟台钢管厂 Accu—Roll 轧管机芯棒的石墨润滑剂特性、润滑机理、石墨润滑剂的机械喷涂系统以及喷涂系统和石墨润滑剂的使用效果。     

C／S数据处理系统及其在DECnet上的实践

本文介绍了ＶＡＸ－ＰＣ构成的异构ＤＥＣｎｅｔ网络中实施Ｃ／Ｓ数据处理系统的一般方法，并以一个Ｃ／Ｓ方式聚变实验数据处理系统为例，详细说明了ＶＡＸ－ＰＣ在ＤＥＣｎｅｔ环境下的Ｃ／Ｓ系统的实现方法。通过对ＶＡＸ集中式处理系统与Ｃ／Ｓ方式处理系统的性能评价说明了Ｃ／Ｓ方式的优越性。     

兰代化纤厂CIMS应用工程之实践

兰化化纤厂ＣＩＭＳ应用工程是８６３／ＣＩＭＳ推广应用项目之一，该工程的第一阶段业已如期完成并通过验收。该厂的生产过程属于连续流程型，工程实施中突出地显现出流程ＣＩＭ的特点。有别于离散生产型，本文首先给出只包含生产实施和管理信息两个应用分系统的体系结构的设计。文中在介绍了第一阶段工程所完成的工作后，结合快速原型法实验，着重介绍在ＣＩＭＳ工程中应用Ｃｌｉｅｎｔ／Ｓｅｒｖｅｒ体系结构及使用先进开发。具开发软件的初步经验；文章中还特别介绍了在工程实施中要充分重视人和组织在ＣＩＭＳ中的地位，先期工作中就着力加强企业管理模式重构的研究与设计，并积累了有益的经验。     

Seismic collapse risk assessment of super high‐rise buildings considering modeling uncertainty: A case study

Based on the multiple stripes analysis method and the first‐order second‐moment method, a seismic collapse risk assessment considering the modeling uncertainty is carried out for a 118‐story super high‐rise building with a typical mega‐frame/core‐tube/outrigger resisting system. The sensitivity of the median collapse capacity of the building to eight main parameters is analyzed, and then the modeling uncertainty is determined. Both the effects of the characterization methods of bidirectional ground motion intensities and the selection of the ground motion intensity measure (IM) on the aleatory randomness are investigated. The mean estimates approach and the confidence interval method are used to incorporate both the modeling uncertainty and the aleatory randomness, and then the annual collapse probability, the collapse probability at the maximum considered earthquake (MCE) intensity level and the acceptable values of the collapse margin ratios (CMRs) with different confidence levels for the building are calculated. The results show that the influence of the modeling uncertainty on the collapse capacity of the super high‐rise structure is negligible, the aleatory randomness caused by the record‐to‐record variability is significant, and an appropriate ground motion IM can significantly reduce the aleatory randomness.     

A Security Protocol Resistant to Intermittent Position Trace Attacks and Desynchronization Attacks in RFID Systems

Radio frequency identification (RFID) technology will become more popular in various applications in the near future. But the security issues in RFID systems have hindered this technical promotion seriously. The extant RFID security protocols have serious insufficiency and flaws to resistance trace attacks and desynchronization attacks. In this paper, we propose a security protocol that can against the intermittent position trace attacks and desynchronization attacks. We prove the security of the proposed protocol by data reduction method with the learning parity with noise and formally verify the functionality of the proposed scheme by using Colored Petri Nets.     

浅谈EPS电源和UPS电源

文章介绍了EPS电源和UPS电源的异同,可以增强人们对两者的认识和了解,合理选择和使用有所启示。