Removal of Toluene by Adsorption/Desorption Using Ultra-stable Y Zeolite

The adsorption performance of toluene on ultra-stable Y zeolite(USY) was studied via dynamic adsorption. The effects of bed temperature, initial concentration, and feed flow rate on adsorption were investigated. The Yoon–Nelson model was used to fit the toluene breakthrough curves. The length of mass transfer zone was calculated based on breakthrough curves. The Langmuir–Freundlich model fit the adsorption isotherms of toluene on USY, which indicated that the surface of USY was heterogeneous. The adsorption isosteric heat calculated from adsorption isotherms ranged from 54.3 to 69.8 kJ/mol, indicating physical adsorption. The combined technique of temperature swing adsorption with vacuum swing adsorption(TVSA) exhibited excellent desorption performance, which was attributed to the low desorption activation energy. Under optimized TVSA conditions, the desorption rate of toluene reached 90.6% within 10 min. The long-term cyclic utilization results indicated that the adsorption capacity of USY was stable.     

Enhancing cellular immune response to HBV M DNA vaccine in mice by codelivery of interleukin-18 recombinant

Objective: To investigate the effect of interleukin-18 (IL-18) on immune response induced by plasmid encoding hepatitis B virus middle protein antigen and to explore new strategies for prophylactic and therapeutic HBV DNA vaccines. Methods: BALB/c mice were immunized with pCMV-M alone or co-immunized with pcDNA3-18 and pCMV-M and then their sera were collected for analysing anti-HBsAg antibody by ELISA; splenocytes were isolated for detecting specific CTL response and cytokine assay in vitro. Results: The anti-HBs antibody level of mice co-immunized with pcDNA3-18 and pCMV-M was slightly higher than that of mice immunized with pCMV-M alone, but there was not significantly different (P>0.05). Compared with mice injected with pCMV-M, the specific CTL cytotoxity activity of mice immunized with pcDNA3-18 and pCMV-M was significantly enhanced (P<0.05) and the level of IFN-γ in supernatant of splenocytes cultured with HBsAg in vitro was significantly elevated (P<0.05) while the level of IL-4 had no significant difference (P>0.05). Conclusion: The plasmid encoding IL-18 together with HBV M gene DNA vaccines may enhance specific TH1 cells and CTL cellular immune response induced in mice, so that IL-18 is a promising immune adjuvant.     

弹塑性断裂的内参量热力学分析——Ⅰ.线弹性裂纹体的裂纹扩展

本文在内参量热力学的理论框架内详细讨论了线弹性裂纹体的裂纹扩展问题。对线弹性断裂力学中所涉及到的各种能量关系作了统一的整理,其中包括Irwin的弹性能释放率——裂纹扩展力,Griffith的脆性断裂准则,以及Irwin-Kies的柔度公式和Paris的位移公式。本文以中心裂纹体为例,详细计算了裂纹扩展的稳定性,并区分恒载荷和恒位移两种情况,对材料断裂韧性测试中所遇到的失稳扩展,稳定扩展以及进发现象提供了理论说明。     

巧用Powerpoint 2002新增动画功能制作楞次定律演示课件

介绍了运用Powerpoint 2002制作楞次定律演示课件的过程和技巧。     

高校闲暇教育现状剖析与措施建构

高校闲暇教育在现代高等教育中占有重要的一席，这不仅是社会发展的需要，也是大学生发展的需要。本文通过分析当今大学生闲暇生活存在的问题．从而对高校闲暇教育现状的原因进行剖析，并对高校闲暇教育的措施进行建构，以期能深化高等教育中闲暇教育的研究。     

新自由主义时期的世界经济

新自由主义政策在世界范围的泛滥打击了工人阶级的政治和经济理论,破坏了社会主义国家和许多第三世界国家发展民族经济的努力,一定程度上改变了世界范围利润率下降的趋势。它给世界人民带来了深重的灾难,并加剧了世界资本主义体系内部的各种矛盾,使其结构性危机越来越严重。     

战略联盟:我国高校可持续发展的有效途径

近年来,高等教育内外部环境发生着深刻的变化,高校面临一系列新挑战。高等教育要以可持续发展为目标,高校战略联盟是高校持续发展的有效途径,通过高校战略联盟实现资源共享、风险共担、相互促进、共同发展的合作机制,进而有效提高我国高校的核心竞争能力。     

Color control of the multi-color printing device

INTRODUCTION During the development of printing technology, digital printing has played an important role. Now various kinds of multi-color digital inkjet printers are available. Compared with the conventional digital inkjet printer, the multi-color digital inkjet printer has larger color gamut and can faithfully produce more colors. The conventional color printing devices nor- mally use three or four inks, e.g., CMY, CMYK. Although some adopt more than four inks, e.g., CMYKLcLm, the…     

浅析邓小平的反腐败斗争理论

邓小平依法治理腐败思想是邓小平理论体系的重要组成部分,有着丰富的内容。邓小平认为,治理腐败,要标本兼治,既要重视治标,更要重视治本。邓小平不仅强调要依靠法制监督制约权力,还十分重视法律在惩治腐败中的作用,他认为惩治腐败靠“人治”是靠不住的,“法治”才靠得住些。他要求要完善法制,把反腐败斗争纳入法制化轨道。他强调指出,制定法律要完备,执行法律要严格,惩治腐败分子要严厉。     

谈如何做好高校学生干部的培养工作

做好学生干部培养是高校学生管理工作中非常重要的一个环节 ,本文结合作者实际工作中的一些经验 ,重点介绍了如何做好学生干部培养工作