三个热力学偏导数()、()和()等于系统化学势的又一证明方法

对三个热力学偏导数()、()和()等于系统化学势给出了又一种证明方法.     

高效传热管内凝结换热性能及阻力性能的实验研究

本文以ＨＦＣ１３４ａ和ＨＣＦＣ２２为工质对光管及两种不同槽型的强化传热管（ＤＡＥ－２管与ＤＡＥＣ管）的水平管内凝结换热进行了对比实验研究、研究发现,ＤＡＥ－２管平均换热系数比光管提高了１４０％～１７０％,而单位长度阻力损失增加了５０％～１００％,ＤＡＥＣ管平均换热系数比光管提高了１６０％～２００％,同时单位长度阻力损失增加了７０％～１３０％。此外,本文给出了ＤＡＥ－２管和ＤＡＥＣ管平均换热系数及阻力损失的计算关联式,可用于冷凝器设计。     

高等院校创新人才培养模式的探索与实践

培育创新型、德才兼备型、且具有较高实践能力的人才,是各高等院校多年来常抓不懈,实践探索的重心.西安电子科技大学在以培养基础扎实、知识面宽、能力强、素质高的创新型人才为核心目标的基础上,固本促创新,进一步转变人才培养观念,树立先进的教育理念.探索基于"研究-实践-创新"的人才培养模式,设计"两层四类"的实践创新结构,更新了实践教学观念,丰富了实践教学体系,进一步引导学生尽早参加科研和创新活动,使更多的大学生从中受益,并在实践动手能力与创新能力方面得到更好的提高.     

银河杜仲沼液种植3层目标轮换6级储存网络系统设计

由农村沼气工程引起的规模养殖沼液二次污染问题是当前农村环境污染治理的重点问题,也是牵制农业产业化发展,影响中国特色农业现代化道路的关键矛盾。运用最大流和最小饱和流理论,以消除江西银河杜仲绿色规模养殖基地的二次污染为研究对象,对沼液输送浇灌净化工艺流程进行了3层6级储存网络设计分析,给出了解决规模养殖沼液二次污染矛盾,实现沼液零污染最小排量问题的有效方法。     

荷移络合物分光光度法测定头孢噻肟钠的研究

研究了头孢噻肟钠与对苯醌(p-BQ)的荷移反应.确定了形成电荷转移络合物的最佳反应条件.在硼砂介质中,电子给予体头孢噻肟钠与电子接受体对苯醌于室温下可形成1:2的荷移络合物,络合物的最大吸收波长为587.5nm;表观摩尔吸光系数ε=9.92×103L·mol-1·cm-1;线性范围为2-36μg/mL;对形成荷移络合物...     

A Helium Atom Confined by a Spherical Gaussian Potential Well

The helium atom confined by a non-impenetrable spherical box, i.e., a spherical Gaussian potential well which possesses finite height and range, is studied employing the exact diagonalization method. Total energies of the ground and three low-excited states are obtained as a function of the confined potential radii. We find that the confinement may cause accidental degeneracies between levels with different low-excited states and the inversion of the energy values. The results for the three-dimensional spherical potential well and the two-dimensional disc-like potential well are compared with each other： in general, the energies of the states decrease and the energy intervals between states increase with the reduction of the space dimensions.     

紫外分光光度法测定玉屏风散中黄芪甲苷的含量

用紫外分光光度法测定了玉屏风散中黄芪甲苷的含量及对其稳定性进行了研究,并对其结果进行了分析从而对本品质量进行控制.结果表明,采用紫外分光光度法测定黄芪甲苷含量,在波长为578±2nm时,浓度与吸光度呈线性关系,回归方程为y=0.080x 0.051,相关系数r2=0.9995;加样回收率为97.38%,RSD为0.86%(n=6).该法简便易行、快速准确,可作为玉屏风散中黄芪甲苷含量的测定.     

An explanation for deviations from the quark number scaling of elliptic flows in low pT region

We carry out a systematic study of the different contributions to the deviations of the elliptic flows from the quark number scaling in high energy heavy ion collision in a quark combination model.The effects that we considered are:the resonance decay,the flavor dependence of the quark elliptic flow and the combination of quarks/antiquarks with slightly different transverse momenta.Our results show that the deviations observed in experiments can be well reproduced within the combination framework if all the three effects are considered. We make a detailed analysis of the different contributions using a Monte-Carlo program and suggest measuring the quark number scaling in intermediate pT range more precisely.