利用改进开窗转换法确定沥青离散松弛时间谱

为了精确地获得沥青胶结料的离散松弛时间谱,提出了一种改进开窗转换法的线性黏弹性材料函数转换算法．此方法可以用于离散延迟时间谱和离散松弛时间谱的相互转换．与开窗转换法相比,改进开窗转换法对于时间常数的设置更加精确,并且不会产生负数谱线．将改进开窗转换法用于一种传统非改性沥青的弯曲梁流变仪试验数据的离散延迟时间谱的转换,成功地确定了相应的离散松弛时间谱．经有限元模型验证表明,此离散松弛时间谱能很好地还原该沥青结合料的应力松弛特性．     

The british building colour standards: Conversion to the notations of munsell,NCS, din,coloroid, colorcurve,and OSA-UCS

This article provides Munsell (aim and actual), NCS (aim and actual), DIN (aim and actual), Coloroid (aim), Colorcurve (aim and actual), and OSA-UCS (aim and actual) notations for the 237 colour samples that comprise BS5252. These notations were obtained from recent spectrophotometric measurement of the standard, using a new version of the colour notation conversion program initially developed at the University of Teesside. © 1995 John Wiley & Sons. Inc.     

库车火电厂辅助车间热控系统设计特点

摘要：通过对库车火电厂辅助车间热工控制系统的详细介绍，着重论述了可编程控制器（PLC）选型、辅助程控系统的配置及控制软件一体化的优势，为辅助车间联成辅网系统在软件和硬件方面创造了条件，更便于今后电厂的运行和管理。     

On Interconversion of Various Material Functions of PMMA

The interconversion between various linear viscoelastic functions forPoly (methyl) methacrylate (PMMA) is explored. With the availability offour time or frequency-dependent material functions (shear, bulk,uniaxial and Poisson) on the same material, various material functionsare computed using the correspondence principle of the linearized theoryof viscoelasticity through the use of standard relations. Computedmaterial functions are evaluated against the directly measuredproperties and the limitations imposed on successful interconversion dueto the experimental errors in the underlying physical data are explored.It is observed that the differences between the computed and measuredfunctions were larger than suggested by experimental error. The resultsintimates the need to thoroughly re-examine the applicability oftime-temperature superposition principle often employed to develop`master curves' for viscoelastic functions, especially with respect tothe glassy domain.     

动定模反装的前盖注射模设计

分析了前盖塑件的工艺特点、成型方案及注射成型条件,为实现塑件的内侧抽芯和型芯的复位,保证塑件的外观质量,模具采用多次分型和动、定模反装结构,对模具的设计要点及其工作过程作了详细的介绍。     

侧盖热流道动定模反装注射模设计

介绍了侧盖热流道动、定模反装注射模设计,应用定距拉杆以及液压缸实现了模具顺序开模和塑件的顶出,保证了产品质量。     

A Sign Control Method for Fitting and Interconverting Material Functions for Linearly Viscoelastic Solids

The multidata method was originally proposed to fit a Prony exponentialseries function to experimental viscoelastic modulus and compliance data;this was accomplished by the application of a linear least squares solver.This paper considers a similar approach, but extended in two key ways.First, it has been applied to the solution of convolution integralequations; specifically those used for material function interconversion.Second, it has been modified to force the signs of the Prony seriescoefficients to be positive; this is an essential criterion for the properphysical interpretation of a Prony series material function, which istypically not satisfied by multidata method solutions. Sign control isimplemented by an iterative Levenberg–Marquardt solution algorithm withan appropriate constraint, and can be used for both fitting experimentaldata and interconversion. To use the method, a Prony series must becapable of adequately representing the applicable functions. The method isdemonstrated by first fitting and converting experimental modulus data.Formulation for a composite lamina is also shown, in which a system ofintegral equations is reduced to a single integral equation; this can thenbe solved using the new method. Finally, application of the new method tofrequency domain transformations is demonstrated, along with comparisonsto other techniques.     

某220kV变电站220kV母差保护动作事故分析

针对一起220 kV某变电站200 kV母线保护误动事故,通过对本变电站动作的220 kV北母线和两条220 kV线路等一次设备和二次回路及保护装置做全面的检验,对继电保护动作的过程和事故录波报告进行详细的分析,确认了WMZ-41微机母线保护装置的A/D模数转换老化和装置电源损坏是本次母线保护装置误动的根本原因,更换了损坏的保护装置插件和装置电源,并按照新安装电力设备的检验标准对母线保护装置进行全面的检查,检查合格后方可投入运行;并找出了提高同类母线保护装置运行可靠性的技术措施。     

Type I–IV Halogen⋯Halogen Interactions: A Comparative Theoretical Study in Halobenzene⋯Halobenzene Homodimers

In the current study, unexplored type IV halogen⋯halogen interaction was thoroughly elucidated, for the first time, and compared to the well-established types I–III interactions by means of the second-order Møller–Plesset (MP2) method. For this aim, the halobenzene⋯halobenzene homodimers (where halogen = Cl, Br, and I) were designed into four different types, parodying the considered interactions. From the energetic perspective, the preference of scouted homodimers was ascribed to type II interactions (i.e., highest binding energy), whereas the lowest binding energies were discerned in type III interactions. Generally, binding energies of the studied interactions were observed to decline with the decrease in the σ-hole size in the order, C₆H₅I⋯IC₆H₅ > C₆H₅Br⋯BrC₆H₅ > C₆H₅Cl⋯ClC₆H₅ homodimers and the reverse was noticed in the case of type IV interactions. Such peculiar observations were relevant to the ample contributions of negative-belt⋯negative-belt interactions within the C₆H₅Cl⋯ClC₆H₅ homodimer. Further, type IV torsional trans → cis interconversion of C₆H₅X⋯XC₆H₅ homodimers was investigated to quantify the π⋯π contributions into the total binding energies. Evidently, the energetic features illustrated the amelioration of the considered homodimers (i.e., more negative binding energy) along the prolonged scope of torsional trans → cis interconversion. In turn, these findings outlined the efficiency of the cis configuration over the trans analog. Generally, symmetry-adapted perturbation theory-based energy decomposition analysis (SAPT-EDA) demonstrated the predominance of all the scouted homodimers by the dispersion forces. The obtained results would be beneficial for the omnipresent studies relevant to the applications of halogen bonds in the fields of materials science and crystal engineering.     

A Flexible Strategy for Modular Synthesis of Curcuminoid-BF2/Curcuminoid Pairs and Their Comparative Antiproliferative Activity in Human Cancer Cell Lines

A facile protocol that enables synthetic interconversion of CUR-BF₂ and CUR compounds is described that significantly widens the preparative scope of curcuminoids, providing access to larger libraries of compounds, thus enabling comparative antiproliferative and apoptotic study of a larger library of synthetic analogs in cancer cell lines.