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.     

论英语语法的交际化教学

与传统的语法教学模式相比，交际法运用于语法教学具有独到的优势：它使学生的语法学习与语言运用相结合，大大提高了学生的交际能力。基于此因，拟就英语语法的交际化教学的具体方式方法做些探讨。     

远程开放教育教师发展路向探究——基于典型开放大学的比较分析

开放大学作为远程开放教育的积极推动者,其教师的发展现状能够在一定程度上代表和呈现远程开放教育教师的样态。基于代表性、区域性和研究资料易获得性,选取英国开放大学、南非大学、美国凤凰城大学、日本放送大学为案例,呈现以开放大学为代表的远程开放教育教师发展现状。在此基础上,从教师规模与结构、类型与角色、聘任与管理、专业发展与队伍建设等方面进行比较分析,得出远程开放教育教师发展需要着力于:加强专职教师队伍建设、稳定并规范兼职教师队伍、不断提升教师队伍的整体素质、建立并完善教师的管理体系。     

对高校图书馆管理创新的思考

新形势下高校图书馆发生了前所未有的变化，新的变化不可避免地带来了管理上的变化。着重从高校图书馆的人员、读者、服务等方面谈了管理创新的方法。     

2000年以来欧盟终身学习战略实施新特点

2000年里斯本会议以来,欧盟根据新的目标、站在新的高度对终身学习战略重新作了统一规划和部署,终身学习取得了前所未有的战略地位,人们对终身学习有了全面、全新的理解,并将终身学习作为多领域、全方位的社会系统工程,开展了有效的信息统计服务,完善了指标监控体系.     

考试怯场的成因与对策

考试怯场在考生中普遍存在,不利于考生实际水平的正常发挥,严重影响考试结果。因此,我们应该积极探究考生考试怯场的生理机制、主要特征、表现形式与形成原因,并积极寻求对策加以有效预防和最优调控。     

贵州文化资源与开发诌议

贵州是一个喀斯特岩溶特别发育的高原山区 ,又是一个多民族聚居的省份。基于自然地理、生态环境和人文景观等特殊条件 ,贵州有着别具特色的丰富的史前文化资源、古代文化资源、近现代文化资源和喀斯特文化资源。这些资源 ,具有极高的旅游、观赏价值和科研价值。独特的地理生态环境和历史因素酿就了贵州文化的独特、古朴、多样性、边缘性和多元一体的明显特征。加强以贵州文化资源和喀斯特城市园林山水资源为代表的各种自然风光和人文景观为主要内容的重点综合开发 ,加强历史古迹、民族文化资源和革命文化资源的保护、抢救、整理、研究和开发是发展贵州经济文化 ,建设社会主义物质和精神文明的需要     

某大型房地产公司发展战略的制定和实施

背景：房地产行业是远迅所关注和服务的重要行业之一。2001年10月15日，远迅前身安信通盟成立后的一周，就竞标获得万通集团战略咨询项目，开创了中国第一个有影响力的房地产战略咨询项目。之后远迅陆续为多家大型房地产企业提供咨询服务并积累了丰富的经验，远迅为客户A集团提供的咨询服务就是很典型的例子。     

Effects of Second-Order Difference-Frequency Wave Forces on Floating Wind Turbine Under Survival Condition

In this paper, the effects of second-order difference-frequency wave forces on the global motion of an offshore wind turbine system with a large displacement under the survival condition are studied. In this case, the hydrodynamic force is the main force because the blades are feathered to reduce the lifting force. The first-order hydrodynamic forces are calculated by WADAM, while the second-order wave forces are calculated by a customized MATLAB module. Then the hydrodynamic coefficients are transferred to the wind turbine analytical code FAST. Through the comparisons of dynamic responses between the first- and second-order numerical models, it is found that the second-order wave forces significantly influence the motion of floating wind turbine under the survival condition. Moreover, neglecting the second-order force significantly underestimates the tension forces in the mooring lines.     

Chelators effect on soil Cu extractability and uptake byElsholtzia splendens

Phytoremediation is emerging as a potential cost-effective solution for remediation of contaminated soils, and bioavailability of metal in the soil for plant uptake is an important factor for successful phytoremediation. This study aimed at investigating the ability of EDTA and citric acid for enhancing soil bioavailability of Cu and phytoremediation by Elsholtzia splendens in two types of soils contaminated with heavy metals [i.e. mined soil from copper mining area (MS), and paddy soil (PS) polluted by copper refining]. The results showed that addition of 2.5 mmol/kg EDTA significantly increased the H₂O extractable Cu concentration from 1.20 to 15.78 mg/kg in MS and from 0.26 to 15.72 mg/kg in PS, and that shoot Cu concentration increased 4-fold and 8-fold as compared to the control. There was no significant difference between the treatment with 5.0 mmol/kg EDTA and that with 2.5 mmol/kg EDTA, probably because that 2.5 mmol/kg EDTA was enough for elevating Cu bioavailability to the maximum level. As compared with the control, citric acid had no marked effect on both soil extractable Cu and shoot Cu concentration or accumulation. The results indicated that EDTA addition can increase the potential and efficiency of Cu phytoextraction byE. splendens in polluted soils. Project supported by the National Natural Science Foundation of China (No. 29977017) and the Science and Technology Ministry of China (No. 2002CB410804)