我院公共体育课程现状分析与思考

比较分节了我院公共体育课程教学与《全国普通高等学校体育课程教学指导纲要》对高校体育课程教学的要求之间存在的差距,阐述了这些差距存在的原因,提出缩小差距、深化我院公共体育课程教学改革的基本思路。     

Key technologies for polymer electrolyte membrane fuel cell systems fueled impure hydrogen

Hydrogen energy and polymer electrolyte membrane (PEM) fuel cells become concerned issues in recent years. Nevertheless, the construction of hydrogen refueling infrastructure and hydrogen storage and transportation constrains the commercial development of fuel cells. In this review, sources, production, storage, transportation, and purification methods of hydrogen are extensively reviewed and compared. The advantages of utilizing industrial by-product hydrogen and steam reforming gas in PEM fuel cell systems are analyzed. Using industrial wasted hydrogen can significantly reduce the cost of hydrogen. Also, it is indicated that the onboard hydrogen generation by steam methanol reforming can solve the difficulties of efficient storage and transportation of gaseous hydrogen, which means that methanol has great potential to be a convenient carrier of hydrogen. The effects of impurities contained in the reformate gas are generally introduced. After the methanol steam reforming and pretreatment purification processes, the reformate gas can be fed to PEM fuel cells. Thus, a fuel cell system integrated with onboard hydrogen production and impure hydrogen treatment subsystems is introduced, and key technologies therein for pretreatment purification and in-situ poisoning mitigation methods are reviewed. Finally, suggestions are proposed for further studies.     

基于双延迟变形系统的图像加密方法

针对典型的超混沌序列伪随机性较差的问题, 提出了一种基于掺铒光纤激光器双延迟变形系统超混沌序列的图像加密方法。该方法使用改进的双延迟变形系统产生超混沌伪随机序列, 该序列有更大的李雅普诺夫指数, 更强的伪随机特性。该方法应用在图像加密上, 只需一轮置乱和扩散, 并且不用同其他的伪随机序列联合使用。实验证明, 该方法有可靠的安全性, 足够的密钥空间和可接受的加密速度。     

对教学计划改革中的两个实践学期的思考

分析了两个实践学期与杭工院特色的关系,回顾并分析了杭工院现有两个实践学期的构成及时间安排,提出了一些新的思想与解决相应问题的方法,在动态中来完善两个实践学期及杭工院的教学计划．     

Hydrogen Production with Steam Reforming of Dimethyl Ether

Steam reforming of methanol and gasoline is actively researched and developed as hydrogen supply methods for the fuel cells of vehicles and so on. However, these materials have the problems such as the infrastructure, toxicity, difficulty of the reforming, and so forth. Dimethyl ether （DME） does not contain the poisonous substances, and is expected as a clean fuel of the next generation. DME is able to take the place of light oil and LPG, and its physical properties are similar to those of LPG. There is possibility that DME infrastructures will be settled more rapidly than those of hydrogen and methanol, because LPG infrastructures existing are able to use for DME. Then, we have been studying on steam reforming of DME for the hydrogen production.     

加强实验教学管理的探索与实践

深化实验教学改革,不断提高实验教学管理水平,为高校培养人才提供良好的实验条件。结合学校实验教学的情况,介绍我校加强实验教学管理实践的一些情况,提出了在实验教学中加强管理的一些思路。     

某综合楼加层改造设计

某3层砖混结构办公楼需拆除层1部分承重墙,改造成为大空间的办公室门厅。承重墙顶部的圈梁需加固。由于层3墙体不拆除,层2梁上部荷载较大,采用了圈梁侧做托梁、后拆墙的方案。层2墙拆除后,层2梁上部荷载较小,加固可采用临时硬撑支顶,先拆墙、在梁底加大截面的方案;为支撑托梁,对构造柱进行了处理。     

低温等离子体汽油重整对稀燃极限影响的实验

为提高稀薄燃烧汽油机的稀燃极限,提出了一种借助低温等离子体,利用稀薄燃烧发动机排气中的氧气和水蒸气对燃油进行重整,以制得富氢的混合气体辅助发动机进行稀薄燃烧的方法．设计了一套等离子体排气重整系统,并对其进行了排气重整性能的研究．在一台稀燃发动机上进行了低温等离子体燃油重整对稀薄燃烧极限影响的实验,实验结果表明：利用等离子体排气重整系统,能够进一步扩大发动机的稀燃极限;重整比例每增大10％,发动机燃烧极限增大约1～2个空燃比单位．     

乙醇重整制氢对马来酸酐原位加氢制备四氢呋喃的研究

制备了两种聚乙烯吡咯烷酮(PVP)稳定的γ-Al_2O_3负载型稀土金属催化剂(PVP-La/Al_2O_3,PVP-Ce/Al_2O_3),并首次将乙醇催化重整制氢运用于马来酸酐(MA)液相加氢制备四氢呋喃(THF)的过程中。同时,对比研究了一种PVP稳定的钯催化剂(PVP-Pd/Al_2O_3)催化马来酸酐加氢的活性。结果表明,两种稀土金属催化剂显示出比PVP-Pd/Al_2O_3更优的催化性能。进而,系统考察了反应条件对PVPLa/Al_2O_3催化马来酸酐加氢反应的影响。在优化的条件下,MA实现了100%的转化,THF的选择性超过95.0%,最高达到98.2%的THF选择性。     

甲醇重整制氢反应器的模拟研究

在Peppley等人提出的甲醇水蒸汽重整反应机理的基础上建立了甲醇重整制氢反应器的模型。并依据所建立的模型对不同压力及空速下甲醇的转化率进行了模拟并与实验数据进行了对比,结果显示甲醇转化率的模拟值与实验数据有较好的吻合（相对误差1.13%）。在所建立模型的基础上,进一步地讨论了反应器入口甲醇比率和入口温度对甲醇转化率以及单位甲 醇制氢量的影响。并得出了在所给出的操作条件下,当入口温度为570K,F_M,R/^FM,B=8.5时,单位甲醇的制氢量最高,可达到2.64（mol/mol）。