2-环戊基环戊酮香料的制备与应用

以尼龙酸副产物2-亚环戊基环戊酮为原料，液体镍为催化剂，催化加氢制得了2-环戊基环戊酮。经元素分析、GCMS、IR、^1HNMR、^13C NMR检测，认为结构正确，色谱纯度大于99．9％。大鼠口服LD50雄性5381．5mg／kg，雌性5087．5mg／kg。具有留兰香样的香气，可用作食用和日用香料。     

Visual evaluation at scale of threshold to suprathreshold color difference

Visual evaluation experiments of color discrimination threshold and suprathreshold color‐difference comparison were carried out using CRT colors based on the psychophysical methods of interleaved staircase and constant stimuli, respectively. A large set of experimental data was generated ranged from threshold to large suprathreshold color difference at the five CIE color centers. The visual data were analyzed in detail for every observer at each visual scale to show the effect of color‐difference magnitude on the observer precision. The chromaticity ellipses from this study were compared with four previous published data, of CRT colors by Cui and Luo, and of surface colors by RIT‐DuPont, Cheung and Rigg, and Guan and Luo, to report the reproducibility of this kind of experiment using CRT colors and the variations between CRT and surface data, respectively. The present threshold data were also compared against the different suprathreshold data to show the effect of color‐difference scales. The visual results were further used to test the three advance color‐difference formulae, CMC, CIE94, and CIEDE2000, together with the basic CIELAB equation. In their original forms or with optimized K_L values, the CIEDE2000 outperformed others, followed by CMC, and with the CIELAB and CIE94 the poorest for predicting the combined dataset of all color centers in the present study. © 2005 Wiley Periodicals, Inc. Col Res Appl, 30, 198–208, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/col.20106     

基于FLUENT软件的管式搅拌反应器流场的数值模拟

运用商业计算流体力学(CFD)软件FLUENT对一种新型管式搅拌反应器进行流场模拟,用GAMBIT建立流场实体模型,采用标准k-ε湍流模型以及多重参考系法(MRF)处理搅拌桨区.结果表明,计算所选模型能较准确地预测搅拌反应器的速度场、压力场及湍流动能分布,考察流量为1 m3/h时不同搅拌转速对反应器内部混合的影响,此时对应的最佳搅拌转速为50 rpm左右.模拟结果将为实验研究提供适当的操作参数,对搅拌反应器的优化和放大具有一定参考价值.     

高柔韧性尼龙1010材料的制备

对尼龙1010/NBR/增塑剂体系进行了系统研究,发现在挤出机中环氧扩链剂可以对尼龙进行扩链反应,且环氧树脂对尼龙1010的扩链反应活性较高,扩链效果比较明显;N-丁基苯磺酰胺是尼龙的良好增塑剂,经增塑、增韧后可以使经扩链后的尼龙1010柔韧性有明显提高.采用SEM和TEM对所制备的材料进行了形貌分析,发现用NBR增韧尼龙,对于不同的基体材料,橡胶粒子的形貌有很大不同,粒子由增韧纯尼龙的椭球形变为在增塑尼龙基体中不规则的形状.     

交流，共享，流动——现代大空间办公模式的优劣与对策

讨论了现代办公空间设计出现的新要求,通过办公空间演变趋势的探讨,归纳为若干大空间办公模式,并分析、比较其空间性质及特点,以及采用开放式办公布局的优势、不足及解决对策.     

"橄榄型"社会阶层结构范式论

拥有一个"橄榄型"社会阶层结构,社会就会减少动荡,保持社会的相对稳定与和谐.现阶段培育"橄榄型"的社会阶层结构,是构建社会主义和谐社会的重要基础.     

气力输送在烧结电除尘输灰系统中的应用

针对烧结厂烧结电除尘灰的工况特性，介绍了输送烧结电除尘灰的正压气力输灰系统的特点、组成，还对在调试和试运行过程中遇到的故障进行了分析并制订了解决措施。