全息多场景特高压换流站反事故推演平台研究及开发

研究开发一套全息多场景特高压直流换流站反事故推演平台,包含PSCAD模型计算引擎、仿真控制系统、换流站运行人员工作站和三维虚拟现实服务器,其可为运行及检修人员进行反事故推演、故障模拟预演、控制保护策略分析及培训提供有效的技术支撑。本平台依据实际换流站工程搭建一次设备物理模型,同时创新性的运用PSCAD模拟实际工程二次设备控制保护内部逻辑,实现整个特高压直流输电系统的运行仿真与故障反演。为确保其准确性,仿真平台运用换流站控制保护程序自动转换技术,将实际换流站的二次控制保护模型无缝移植至本平台,仿真准确率可达到95%;为提高仿真效率,本平台通过自动化试验技术,批量进行各种运行方式及故障类型的模型仿真,提高了仿真效率;同时本平台展示系统采用全息三维技术,形成全站设备的3D模型,实现全换流站一二次设备的可视化展示。     

基于BP神经网络的地温推演模型

针对地温观测中数据缺测和国家一般气象站无深层地温观测的问题,提出了采用BP神经网络建立的实时地温推演模型和深层地温推演模型(40~160 cm地温模型和320 cm地温模型)。前者可用于整点地温观测数据缺测的填补,后者用于无深层地温观测地区的地温估算。以样本站的小部分数据训练网络,用样本站全部数据测试,反复调试神经网络参数,筛选出误差性能好的地温模型,再用对比站数据测试地温模型的输出误差。实时地温模型样本站推演正确率为77.705%,对比站推演正确率为66.168%;40~160 cm地温模型72%以上的输出误差不大于0.5℃;320 cm地温模型83%以上的输出误差不大于1℃。实验结果表明,该方法建立的地温推演模型具有较高的精度和实用性。     

Rule Construction and Execution for Root Cause Analysis

We developed a root cause analysis (RCA) system for an enterprise IT system environment. In this paper, we propose a rule‐construction method that builds analysis rule data objects from general analysis rules and the topology information of the actual target IT environment. Using this method, the IT administrator can use the RCA system without any manual rule modifications. For the execution of the analysis, we introduce the certainty factor to realize robust analysis when the order and reachability of a fault event cannot be guaranteed.     

借鉴逻辑学方法提高临床思维能力

目的：正确的临床决策必须遵循逻辑规律。本文旨在剖析用逻辑学方法提高临床思维训练的可行性。方法：进行临床医学和逻辑学的跨学科整合研究，重点探讨三类常用逻辑方法：演绎法、归纳法和溯因推理法在临床实践中的应用。 结果：发现演绎、溯因和归纳推理分别对应于：①评估临床资料；②提出诊断假设和③完善初步诊断这三种临床思维活动。发现并概括临床思维和医疗实践中包含的逻辑规律，有助于提高思维的准确性、有效性和清晰性。结论：掌握临床思维的逻辑规律，并在中针对性地加以应用，有助于培养医生的思维和决策能力。     

“甲供材”费用扣回争议探析——以南京某工程为例

为解决工程量清单计价模式下的＂甲供材＂费用扣回争议,本文以南京一个住宅小区结算时产生的争议为例,分析＂甲供材＂费用扣回案件的实际争议点,并对合同效力、扣回方法的探析,提出扣回方法的要素及其确定标准,结论可以为同类型案例的解决提供理论依据。     

一种不携带隐秘信息的安全隐写模型

基于数字图像的缩放算法,提出一种不携带隐秘信息的安全隐写模型.其利用缩放算法推演秘密信息,并非直接将秘密信息嵌入载体图像中.首先选取载体图像,通过相应放大算法将其放大到一定倍数,然后找出秘密图像与新图像中像素信息的相关性,最后再缩小为原图像大小进行传输.由于没有直接修改图像内容,其隐蔽性较好.实验证明,该方法实现简单,运算量小,安全性高,并且对嵌入的信息提取方便,满足隐藏信息的不可检测性,适应于图像隐蔽通信.     

钢管步进式冷床齿形设计方法及其应用

介绍了Ф159mm连轧管机组步进式冷床的生产工艺及其动作原理,推导出一套适用于该类型冷床齿形设计的公式。利用该公式可从理论上和设计实例上优化冷床齿形设计,并可借助Excel表格进行齿形验算分析,既方便又快捷。     

Synthesis of Chloroaluminate Ionic Liquids and Use for Olefin Reduction in FCC Gasoline

Abstract

Room temperature ionic liquids (RTILs) are mainly referred to melting salt systems composed by organic cations and organic or inorganic anions that exhibit liquid-like behavior at or around room temperature. Chloroaluminate room temperature ionic liquid (chloroaluminate RTILs) is one kind of RTIL synthesized by chloride quaternary ammonium salts and anhydrous AlCl₃. Three kinds of chloroaluminate RTILs were synthesized using trimethylamine hydrochloride (TA), 1-butylpyrinium chloride (BPyC), or 1-methyl-3-alkylimidazolium (BMIC), respectively, with anhydrous AlCl₃ and their application in reducing the content of olefin in FCC gasoline from the Jinzhou Petrochemical Corporation was studied. The effects of chloroaluminate RTIL component and operation conditions on olefin reduction were investigated as well as the repeatability of chloroaluminate RTILs. The results show that at room temperature, when the ratio of anhydrous AlCl₃ to quaternary ammonium (mole/mole), the solvent-oil ratio (g/g), and the reaction time were 2/1, 20/100, and 1/2 h, respectively, the content of olefin in FCC gasoline was deduced more than 30%. The chloroaluminate RTILs could be used at least four times on the basis of keeping their activity.     

A computer algebra approach to verification and deduction in many-valued knowledge systems

 A theoretical result [10] that relates tautological consequence in many-valued logics to the ideal membership problem in algebra is revisited. The intended use of the approach in this article and its implementation is the verification of consistency and the automated extraction of knowledge in rule-based knowledge systems. Programs are written in the CoCoA language. Four RBS are studied to illustrate the implementation.