Thermodynamic Analysis and Comparison on Low Temperature CO_2-NH_3 Cascade Refrigeration Cycle

Intheapplicationsofindustrialandcommercialrefrig erationsystem ,iftherequiredrefrigerationtemperatureisverylow ,theconventionalvaporcompressionsystemisdiffi culttomeettherequirementbecausewhenthedifferencebe tweentheevaporatingtemperatureandthecondensingtemper atureissohighthatitishardtofindarefrigeranttomeettheneedsasthecondensingpressureisnottoohighandtheevap oratingpressureisnottoolow .Whentherefrigeratingtemper atureisverylow ,thecascaderefrigerationcycleissuitabletobeused .Itcannotonlysat…     

Hydrogenation properties of mechanically milled Mg2Nio.8Cr0.2-CoO/Al2O3 composites

Mg2Ni0.8Cr0.2-x wt.% CoO/Al2O3 (x=0.5, 1, 2 and 3) composites were prepared by mechanically milling sintered Mg2Ni0.8Cr0.2 alloy and CoO/Al2O3 compound for 45 h. The addition of CoO/Al2O3 compound resulted in the good kinetics properties of hydriding/dehydriding reaction of the composites. The composite with 1.0 wt.% CoO/Al2O3 catalyst could reach the maximum hydrogen absorption capacity (2.9 wt.%) within 5 min at 393 K under H2 pressure of 4 MPa, and can desorb rapidly at 493 K. The decomposition and synthesis of hydrogen molecule on Mg2Ni0.8Cr0.2 alloy surface was promoted by addition of CoO/Al2O3 catalyst. In addition, the formation of metallic Ni particles, strain and defects during the ball milling process also resulted in the improved hydrogenation performance of Mg2Ni-based alloys.     

2-氯乙胺盐酸盐的合成研究

研究以乙醇胺、氯化氢和二氯亚砜为原料,以氯仿做溶剂,合成2-氯乙胺盐酸盐．实验表明:在气态氯化氢的存在下,摩尔比为1:1．04的乙醇胺和二氯亚砜在71℃下反应4小时, 可获取产率98％的2-氯乙胺盐酸盐．     

In vitro study on ribozyme against hepatitis C virus

Objective: To determine the effective nucleotide sites of ribozymes against HCV, and obtain a highly effective, nontoxic and inexpensive antisense ribozyme specific for HCV. Methods: Two effective ribozymes, targeted to HCV 5’NC region and C region, were designed and synthesized. Eukaryotic expression vectors, pSV2-gpt. CD-SR (, containing either HCRZNC or HCRZC were constructued and transfected into MT-2 cells, which had been infected by HCV. Quantitative PCR and hydridization were used to determine the effect of inhibition of HCV by ribozymes. Results: HCRZNC and HCRZC suppressed the replication of HCV by 54.7% and 62.1%, respectively. Furthermore, when both ribozymes were cotransfected into cells, they suppressed replication by 78.8%. Conclusion: Two specific antisense ribozymes have strong inhibitory effects on the replication of HCV in cultured cells, and have better effect when used together.     

传统几何造型艺术在现代服装设计中的立体表现

近年来,富有形式美感的几何造型服装在时装舞台上越加醒目,越来越多的设计师开始关注传统几何造型艺术在服装设计中的应用价值。如何将传统的造型艺术与现代时尚设计相结合,并创造出新的表现方式,成为研究的关键。在对几何造型的历史渊源及其相关的形式特点进行分析的基础上,对服装廓形、肌理图案、面料中的几何元素在现代服装设计中的立体表现进行分析研究,有利于探索其完美结合后的艺术和商业价值。     

运动员竞赛焦虑状态的分析

以参加第六届全国农运会田径项目的150名运动员作为研究对象,采用＂运动竞赛状态焦虑量表＂（简称CSAI-2问卷）为测试工具进行调查.结果表明：（1）不同性别的运动员竞赛焦虑状态各维度上不存在显著差异,但女运动员竞赛焦虑状态各因素得分略高于男运动员;（2）不同运动年限的运动员竞赛焦虑状态各维度上存在显著差异,运动年限越长竞赛焦虑状态各因素得分越高;（3）不同专项的运动员竞赛焦虑状态各维度不存在显著差异.     

新建地方本科院校课堂教学评价体系新论——基于邯郸学院“234”课堂教学评价体系个案研究

课堂教学评价体系的建构与实施对提高教学质量起着重要的引领作用。对照目前我国高校课堂教学评价体系现存的主要问题,新建地方本科院校应该以先进的教育理论和现代质量管理理论为参照,在外适型质量观的指导下,构建富有现实针对性的评价体系。邯郸学院234课堂教学评价体系在这方面进行了初步探索和研究。     

An Analysis of Foreign Language Learning Styles from the Cognitive Perspective

From the 1970s,learning styles began to enter the domain of foreign language learning researches.Foreign language learning style is often regarded as a significant factor attributing to individual differences among language learners.Nowadays,many researchers begin studying individual learners’characteristics and exploring how different learners interact with external factors from cognitive perspective.The field-independence/dependence construct became a focus.Based on previous studies,the paper is committed to analyzing the nature of FID learners.It is expected that this research can establish a well-grounded basis for following studies.     

物联网关键技术与发展

物联网被称为继计算机、互联网之后世界信息产业第三次浪潮。文章首先解析物联网的基本概念和特征、物联网体系架构,然后归纳物联网涉及的关键技术,最后总结物联网标准化发展现状、问题,并提出物联网标准化发展建议。     

3DV quality model based depth maps for view synthesis in FTV system

Depth maps are used for synthesis virtual view in free-viewpoint television (FTV) systems.When depth maps are derived using existing depth estimation methods,the depth distortions will cause undesirable artifacts in the synthesized views.To solve this problem,a 3D video quality model base depth maps (D-3DV) for virtual view synthesis and depth map coding in the FTV applications is proposed.First,the relationships between distortions in coded depth map and rendered view are derived.Then,a precisely 3DV quali...