自备电厂小机组电气运行中的几个问题

发电机滑环冒火，高、低压备用电源能否安全可靠投运，电气接地网接地电阻是否符合标准，是影响发电机安全稳定运行的3个重要问题。主要论述了发电机滑环冒火的原因及防治办法，造成高、低压备用电源自动投入装置不能安全自动投运的原因及处理方法，电气接地网的检查及维护等问题。     

ULIS系统功能的改进及实现

针对本校图书馆现用自动化管理系统（ULIS）的特点及其不足进行开发性改造，具体介绍了对本院数据库的书目数据重组思路，操作程序及其结果。从而进一步完善了原系统的馆藏管理功能。     

结构可靠性计算的直接积分法

介绍了用直接积分法来计算结构可靠性的基本思想及其计算机程序实现，并用较多的例子验证了程序的可靠性及高效性。     

创业企业公开上市时机选择及策略探讨

本文认为创业企业首次公开上市时机选择对企业股票价值、投资者收益、企业成长和社会福利均具有重大意义 ;认为影响企业选择上市时机的主要因素有股票指数、市盈率、企业成长阶段、风险投资者经验与意愿及宏观管理部门的政策取向等。最后 ,对创业企业选择上市时机提出几点建议和策略 ,为创业企业把握上市时机提供理论参考。     

QUADRATIC ADMISSIBLE ESTIMATE OF COVARIANCE IN PSEUDO-ELLIPTICAL CONTOURED DISTRIBUTION

This article mainly discusses the admissibility of quadratic estimate of covariance in pseudo-elliptical distribution.Under the quadratic loss function,the necessary and sufficient conditions thata quadratic estimator is an admissible estimator of covariance in the class of quadratic estimators areobtained.A complete class of the quadratic estimator class is also given.     

加强线损管理 实现企业利润最大化

随着现阶段电力需求的增大,电量损失越来越大,文中从管理上、技术上论述了如何加强线损管理,以降低供电成本,提高经济效益。     

浅论传统民间工艺的保护和开发——以山东潍坊地区为例

民间工艺文化生态环境的破坏，需求环境的丧失及其本身的不足。使当代潍坊的民间工艺面临生存的困境，根据其生存的现状，可以分为已经消失的、趋于衰微的、改革后有所发展的三大类：要扩展民间工艺的生存和发展空间必须有针对性的采取保护措施和进行适度的开发。     

多功能化学投影仪

介绍了新研制的多功能化学投影仪．该仪器具有化学实验、１３５幻灯片、书写、投影片、生物切片等多种投影功能     

Key-Recovery Attacks on LED-Like Block Ciphers

Asymmetric cryptographic schemes, represented by RSA, have been shown to be insecure under quantum computing conditions. Correspondingly, there is a need to study whether the symmetric cryptosystem can still guarantee high security with the advent of quantum computers. In this paper, based on the basic principles of classical slide attacks and Simon's algorithm, we take LED-like lightweight block ciphers as research objects to present a security analysis under both classical and quantum attacks, fully considering the influence on the security of the ciphers of adding the round constants. By analyzing the information leakage of round constants, we can introduce the differential of the round constants to propose a classical slide attack on full-round LED-64 with a probability of 1. The analysis result shows that LED-64 is unable to resist this kind of classical slide attack, but that attack method is not applicable to LED-128. As for quantum attacks, by improving on existing quantum attack methods we demonstrate a quantum single-key slide attack on LED-64 and a quantum related-key attack on LED-128, and indicators of the two attack algorithms are analyzed in detail. The attack results show that adding round constants does not completely improve the security of the ciphers, and quantum attacks can provide an exponential speed-up over the same attacks in the classical model. It further illustrates that the block cipher that is proved to be safe under classical settings is not necessarily secure under quantum conditions.     

MIL-101(Fe)对草甘膦的吸附行为研究

采用溶剂热法制备MIL-101(Fe)用作吸附材料,借助XRD、SEM、XPS及氮气吸脱附测试对所制材料的形貌及结构进行表征,研究了溶液pH值、反应时间、溶液浓度以及温度对其吸附草甘膦行为的影响。结果表明,当pH为3时,MIL-101(Fe)对草甘膦的吸附效果最佳,且随着温度的升高,MIL-101(Fe)对草甘膦的吸附速率明显增加,吸附过程符合拟二级动力学,等温吸附实验数据符合Langmuir和Temkin模型。MIL-101(Fe)吸附草甘膦属自发吸热的化学吸附反应,MIL-101(Fe)的中心金属Fe与草甘膦中O的配位在吸附过程中起主要作用。