高沸醇溶剂法制浆的中试热量计算

传统的造纸方法主要是亚硫酸盐或碱煮法制浆，用高沸醇溶剂制浆在国内外还没有产业化，研究论也很少。为了能够满足高沸醇溶剂法制浆中试要求，必须进行有关热量计算。本通过丁二醇的比热估算，利用实验室相关数据，算出反应需热量，求得换热器面积。为中试提供了有关参数。     

Coupling reaction mechanism of 2-(2-bromo-4-fluoro-phenyl)-1-cyclohexen-1-yl trifluoromethane-sulfonate

The detailed mechanism of CuI-catalyzed C-O intramolecular coupling reaction of 2-（2-bromo-4-fluoro-phenyl）-l- cyclohexen-1-yl trifluoromethane-sulfonate was studied with the density functional theory （DFT）. The geometries of the reactants, transition states, intermediates and products were optimized at the B3LYP/6-31 ＋G＊ level. Meanwhile, the single point energy of species involved in gas and solvent at B3LYP/6-31 I＋G＊ level was individually investigated. Polarizable continuum models （PCM） were applied to the dioxane and water solutions at the same level, respectively. Results show that the rate-limiting step, M3→TS3, does not change in different solutions. However, the activation energy in a dioxane solution is lower than that in water, which explains the previous experimental results. Compared with the non-catalyzed reaction process, the activation energy of the rate- limiting step is reduced by 56.53 kJ mo1-1 in gas and 44.84 kJ mol-l in solvent, demonstrating a high catalytic efficiency of CuI.     

经济增长率及其来源分析方法的新改进——加入地区权重的索洛增长核算模型及中国的实证

以往学者在分析区域或国家经济增长率及其来源时,通常将用索洛增长核算模型测算得到的各个地区的经济增长率及其来源进行简单加总取均值,忽略了各个地区占整个区域或国家的比重。基于收入函数相关理论,在分析区域或国家的经济增长率及其来源时,应对各个地区的经济增长率及其来源进行加权处理;从决策单元、子集和总集的层面对索洛增长核算模型进行改进,得到进行加权处理(权重即地区总产出占整个区域或国家总产出的比重)的理论依据和方法。根据改进后的索洛增长核算模型对我国2000年以来的经济增长率及其来源进行实证分析,结果表明,改进后的测算结果较改进前GDP增长率有了一定的提高;而对于西部地区,改进前显著低估了劳动贡献率和TFP贡献率,但却较大程度地高估了资本的贡献率。     

数理统计在纡子生产质量和定额管理中的应用

本文以12103双绉纡子为例,应用“数理统计”中x~2拟合适度检验方法,探索丝织厂纡子之间的重量偏差规律。提出了纡子重量允许偏差范围,为纡子生产质量控制提供了科学的定量分析方法。并且在生产稳定的情况下,应用最小二乘法原理求得纡子容丝量的计算公式,为企业内部半制品定额管理提供了一种较好的计算方法。     

Calculation and word problem-solving skill profiles: relationship to previous skills and interest

Abstract

The current study focuses on the calculation and word problem-solving skill profiles at the end of middle school and their relationships to previous skills and interest in math. The sample included 818 (48% boys) Estonian students from 31 schools. Math skills, reasoning, text comprehension, and interest in math were assessed in Grade 8. Latent profile analysis was used to identify latent profiles of calculation and word problem-solving skills in Grade 9 (age 15 years). Five latent profiles were found. Results indicated that students had significantly different math and cognitive skills; however, the interest level for average and lower-achieving students was quite similar. Students with the highest skills had an exceptionally high interest in math, showing that enhancing students’ interest together with academic skills might help to reach a high level of math skills by the end of middle school.     

活用Calculation图标设计CAI课件

在说明Calculation设计图标可以使用的场合和其中可以使用的对象的基础上，结合“函数与反函数概念教学”课件设计工作，阐述如何活用Calculation设计图标进行程序设计来制作课件。     

就地灌注桩断桩的动测检验

大量实践表明,用横向敲击动测法检验桩身质量,灵敏度高,准确度也较大,本文在此基础上着重研究断裂深度的定量分析方法。     

货物税分担的计量

对商品按单位数量征收货物税,一般情况下,会导致市场均衡价格上升,均衡数量减少.赋税如何在消费者和生产者之间分担,取决于该商品的需求价格弹性和供给价格弹性.本文给出消费者和生产者分担赋税的量值.     

浅析心脏做功及其计算

目的通过分析人体心脏做功的过程及大小，为医学工作者提供更多的医学信息。近几年来．在高考物理试卷中偶尔见到这方面的近似计算题，也为这类问题提供理论依据。方法运用流体力学中实际液体的伯努利方程，分析在血液循环过程中，心脏做功的过程及其近似计算的方法。结果建立血液循环的物理模型，运用实际液体的伯努利方程进行分析，可以计算出人体心脏做功的大小。结论掌握和理解心脏做功的过程和计算方法．对预防心血管疾病的发生有重要的意义。     

图书馆书架调整测算方法

在图书馆书架调整搬迁工作中,预先测算最为关键。首先,必须绘制书架调整后的新布局图,并根据布局图统计需要书架的数量;其次,需要对被利用书架的规格、数量进行精确统计,并做好在具体库房的合理布置与设计。通过南通大学图书馆书架搬迁利用的实践发现:旧书架必须拆散搬运;搬迁中旧书架部件不能占用新布局书架的位置,以免妨碍安装,造成重复劳动;搬迁旧书架部件需按类堆放,以便安装使用;搬迁中难免有少量书架部件损坏,要留有一定数量的后备书架或做好修复工作。