金属材料多轴非比例低周疲劳寿命预测概述

工程中的大多数构件承受着比例或非比例多轴疲劳荷载作用,而非比例强化效应会大大影响其多轴疲劳寿命.精确预测金属材料在多轴非比例荷载下的低周疲劳寿命需要同时考虑等向强化、随动强化及非比例强化效应下的材料本构关系,并在临界面上计算出相应应力应变值,根据不同疲劳失效形式选取不同类型的失效模型来确定疲劳寿命.本文针对这一过程中重要知识点进行阐述,并介绍了相关模型与理论.     

期权价格函数的局部多项式估计

本文直接从期权交易价格出发,利用非参数回归方法估计期权定价函数,首先给出期权价络函数的局部多项式估计,然后 Ｂｌａｃｋ－Ｓｃｈｏｌｅｓ公式讨论窗宽的确定,再给出期权价格函数的两步估计方法,最后对芝加哥商业交易所的英镑期货权作实际计算。     

用纤维素黄原酸酯去除硫酸锌浸出液中的重金属杂质

铜;镉;钴;镍;用纤维素黄原酸酯去除硫酸锌浸出液中的重金属杂质     

Biphenyl Ferulate from Glehnia littoralis

From the underground parts of Glehnia littoralis Fr.Schmidt ex Miquel (Umbelliferae), a new compound named glehnilate was obtained. Its structure was determined by analysis of its spectral data.     

它莫西芬诱导乳腺癌MCF-7细胞自噬的比较蛋白质组学研究

自噬(autophagy)广泛存在于真核细胞,贯穿于正常细胞生长发育和生理病理过程.自噬功能的变化与疾病密切相关.     

流化床中高分散镍基催化剂上甲烷的自热重整和部分氧化

Highly dispersed Ni catalysts on spherical SiO2 were prepared by simple impregnation of Ni（acac）2, [Ni-（NH3）6-n（H2O）n]^2＋, [Ni（en）3]^2＋ and [Ni（EDTA）]^2-. Pulse adsorption of H2 and TEM analysis results confirmed that Ni was dispersed very well on the surface of SiO2 even after calcination （4 h） and reduction （1 h） at high temperature of 800 ℃. These highly dispersed and uniquely sized Ni crystallites were more stable and more reactive for both autothermal reforming and partial oxidation of methane in fluidized reactor.     

Excel环境下方波信号源RLC串联电路的模拟

当RLC串联电路外接方波信号源时,采用分段模拟的思想分析其数学关系和程序流程,并在Excel中模拟实现。与Multisim、EWB的模拟结果在初始阶段有些出入,初步探究了其原因,并指出了完善模拟的方向。     

Synthesis of an Indium-iminodiacetate Two-dimensional Layer Network with Rhombus Grids

The title compound, [InCl(C4H5NO4)]n, has been synthesized via the hydrothermal method and characterized by IR, elemental analysis, UV-Vis-Nir spectra and single-crystal X-ray diffraction analysis. Single-crystal X-ray analyses show that it is a carboxylate-bridged two-dimensional layer network indium(III) polymer, catena-poly[[chloroindium(III)]-μ-(iminodiacetate к4N,O,O':O':O'']. The crystal is of orthorhombic system, space group Pnma with a = 13.5970(13), b = 8.7671(10), c = 6.0427(5), C4H5ClInNO4, Mr = 281.36, V = 720.33(12)3, Z = 4, Dc = 2.594 g/cm3, F(000) = 536, μ = 3.613 mm-1, R = 0.0245 and wR = 0.0570. The In(III) ion exhibits an approximately octahedral InClNO4 coordination environment, with the two O donor atoms of iminodiacetate and two O atoms belonging to the carboxylate group of two adjacent iminodiacetates occupying the basal positions, and the chlorine ion and one nitrogen atom of iminodiacetate in the apical sites. Carboxylate groups are mutually cis oriented, and each syn-anti carboxylate group bridges two indium(III) ions via two different basal positions, resulting in the formation of a 2-D network with rhombus (4, 4) grids. Each rhombus grid unit is formed from four indium atoms and four iminodiacetate units with the diagonal lengths of 8.767(1) and 6.043(1).     

基于MVA的教学过程质量分析及学习评价方法

针对高校教学中存在着班级间变异、各个班级不同学生间变异及各个学生对不同课程间变异,提出了基于多变异分析(Multi-Vari Analysis,MVA)的教学过程质量分析方法.方法通过建立基于方差分析教学质量的多变异分析模型,研究了教学过程中3种变异与总变异之间的定量关系,并提出了学生学习评价方法.通过在机制专业大四学生综合能力测试环节的实际应用得出,方法较为真实地反映了教学过程质量状况.     

高分子(纤维)负载-N-(4-吡啶)哌嗪的合成及其催化性能

以废旧聚丙烯纤维为骨架,通过接枝苯乙烯、氯甲基化和负载N-(4-吡啶)哌嗪,合成了高分子(纤维)负载-N-(4-吡啶)哌嗪(1),其结构经IR和元素分析表征,并通过小分子模拟确证.1(5 mol%)用于催化1-苯基乙醇的乙酰化反应,收率90%,在多次循环使用后催化活性基本不变.