电力系统智能化运维中GIS设备SF6气体泄漏检测方法研究

现有技术中的变电站GIS设备内SF6气体泄漏浓度较大,检测精度较低,本文设计了TMS+XD芯片提高巡视机器人性能,采用离子迁移法设计SF6检测技术,利用扫描窗口提供的SF6浓度分析离子波谱,更为精准地判断气体泄漏规律;采用差分能量检测(Differential Energy Detection DED)算法和概率学公式掌握SF6气体泄漏浓度,进而制定出最佳填充范围,增加变电站GIS设备的安全性。试验表明,本研究检测系统输出的SF6泄漏浓度为15.8mol/ml,检测精度为92.5%,SF6气体泄漏浓度少,检测精度高。     

微尺度悬臂管颤振的研究

本文基于修正的偶应力理论并考虑Lagrange应变张量所给出的几何非线性,运用Hamilton原理建立了微悬臂管的平面振动微分方程.通过对线性方程的特征值分析,得到了微管的前四阶复频率及临界流速—质量比曲线(临界流速曲线)对材料长度尺寸参数的依赖关系;并且发现宏观管和微尺度管(或者具有不同材料长度尺寸参数的微管)的临界流速曲线可能会相交.运用基于中心流形—范式理论的投影法,计算了临界流速处系统的第一李雅普诺夫系数和退化特征值关于流速的变化率,以此为基础论证了分岔的超临界性质;并对临界流速曲线上的滞后部分及不同尺度管的该曲线的交点处的动力学性质作了探讨,发现了不同的分岔方向.     

Towards analysing the rationale of information security non-compliance: Devising a Value-Based Compliance analysis method

Employees’ poor compliance with information security policies is a perennial problem. Current information security analysis methods do not allow information security managers to capture the rationalities behind employees’ compliance and non-compliance. To address this shortcoming, this design science research paper suggests: (a) a Value-Based Compliance analysis method and (b) a set of design principles for methods that analyse different rationalities for information security. Our empirical demonstration shows that the method supports a systematic analysis of why employees comply/do not comply with policies. Thus we provide managers with a tool to make them more knowledgeable about employees’ information security behaviours.     

Optimization for allocating the explosive facilities in order to minimize the domino effect using nonlinear programming

Accidents caused by the domino effect in chemical plants or the petrochemical industry are generally more serious than any other accident. But it is difficult to examine the true factor because the domino effect is influenced by many nonlinear factors. The immediate causes of the domino effect are the peak overpressure, flying objects, and flame. Nonlinearity is inherent in all three causes. However, it is believed that a systematic and mathematical approach can minimize the incidence of the domino effect. We considered the case where there were n-explosive facilities in a given arbitrary rectangular facility site. This paper suggests the positions that can minimize the domino effect using a nonlinear approach. The method initiated an arbitrary number of facilities in addition to the original position, and can search for the position to minimize the domino effect. This paper presents a new computer-aided module, MiniFFECT (MINImization of domino eFFECT).     

Characterization of fractured basement reservoir using statistical and fractal methods

This study presents a characterization of fractured basement reservoir by using statistical and fractal methods with outcrop data, seismic data, as well as FMI log data. In the statistical method, fracture intensity and length have been calculated from various outcrop data. The optimum statistical distribution functions of fracture length for outcrops have been identified with the use of discriminant equation derived from Crofton’s theory. The Fisher distribution constant, representing the fracture orientation, has been computed from FMI log data. With the statistical values and distribution functions, a 3D fracture network system has been generated. The result shows that there is no distinction in orientation of the fracture network system, and it excellently matches with the outcrop data. In the fractal method, fractal dimensions of fracture length and strike for the seismic fracture network in areal distribution were calculated; a greater value in fractal dimension means that the fracture network system has intensive fractal characteristics. Meanwhile, vertical distribution and dip angle of the fracture system have been evaluated from FMI log data. The resulting 3D fracture system presents that the overall strike and distribution of the fracture system are excellently matched with those of seismic data.     

NONLINEAR PI CONTROLLER FOR pH PROCESS

The control of pH is one of the most difficult challenges in the process industry because of the severe nonlinearities and high precision required in manipulating the flow rate. The Wiener model, which consists of a linear dynamic element followed by a nonlinear static element, is used for representing such nonlinear processes. Piecewise continuous polynomials are used for mapping the nonlinear static gain accurately. A nonlinear PI controller was designed based on the Wiener model. Simulation results on the nonlinear mathematical model are presented to highlight the superior performance of the Wiener model based nonlinear PI controller in comparison to that of the local linear PI controller. The performance of the nonlinear PI controller was further improved upon by using the method of inequalities to obtain a single set of PI controller settings that takes into account the parametric variations in the linear dynamic element at different operating points. Simulation and experimental results are presented to support the work.     

在线技改工程计成功的关键环节——青海水泥股份公司2000t/d级熟料生产线技改工程设计浅谈

设计阶段控制水泥工程造价的措施包括：推行设计招标竞争的机制：推行以设计为主体的工程项目总承包；推行限额设计，运用价值工程管理优化设计方法，加强设计变更的管理，提高设备国产化率；掌握工程造价及物资采购信息，提高投资估算，概算和设计预算的准确性等等。     

Micromixer as a continuous flow reactor for the synthesis of a pharmaceutical intermediate

A mixing device composed of a micron scale flow channel was applied as a continuous reactor to control exothermic reaction heat and to increase the product yield, in a synthesis of a pharmaceutical intermediate of quinolone antibiotics. The model reaction featured a fast reaction rate, high heat generation, and impurity formation due to a prolonged contact time between reactants and products. Using the micromixer reactor, the reaction heat was efficiently removed so that virtually no impurities were produced during the reaction. A product yield comparable to the theoretical value was achieved in a single micromixer unit. Optimum operating conditions were acquired from a statistical method by using factorial design, which was also verified by a CFD calculation.     

孔边裂纹J积分弹塑性估算解

提出了以单边椭圆孔边裂纹试板（ＳＥＮＣＰ）代替ＥＰＲＩ的中心圆孔边裂纹试件，更合理地模拟压力容器接管高应变梯度区应变分布场，并采用与ＥＰＲＩ相似的方法，以图表的形式给出了几种承受均匀拉伸载荷时的ＳＥＮＣＰ的Ｊ积分弹塑性估算解。     

固井二界面定量评价新方法研究

本文针对套管井中第二界面定量评价的问题,首先开展了套管井中地层波的影响因素的研究,为定量评价第二界面的胶结质量奠定了基础;接着,通过有效确定地层波到达时间,以及地层波信号提取及能量计算,并在充分考虑地层岩性影响的基础上修订了传统的第二界面胶结指数公式,建立了一套完整的定量评价固井二界面胶结质量的新方法;最后通过实际资料处理与评价,证明所提出的定量评价固井二界面胶结质量方法取得了满意的效果。