If条件分句中will的语用功能     

张尚信 《湖南科技学院学报》2002,23(1):64-65

对if-条件分句中的will的语用功能进行了探讨.  相似文献   

Cu-ZnO/Al2O3催化仲丁醇制备甲乙酮     

林武滔  李增富  邱凡 《三明学院学报》2007,24(4):420-424

用Cu-ZnO/Al2O3催化仲丁醇制备甲乙酮。研究了催化剂的焙烧温度和焙烧时间、仲丁醇脱氢反应的温度和压力以及仲丁醇的流量对仲丁醇转化率和甲乙酮选择性的影响。结果表明,催化剂的焙烧温度为300-400℃,焙烧时间为6h,脱氢反应的温度为300℃,压力为0.2Mpa,仲丁醇的流量为140mL/h时,仲丁醇的转化率和甲乙酮的选择性较好。  相似文献   

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

WANG Xiu-li  TU Jiang-ping  CHEN Chang-pin  ZHANG Xiao-bin  ZHAO Xin-bing 《Journal of Zhejiang University. Science. B》2005,(3)

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.  相似文献   

结合专业特色应用现代教育技术服务于中小学教学     

苟泽志 《保山师专学报》2005,24(3):103-104

现代教育技术的应用,深刻影响高中小学各科教学.传统的教学模式必须与现代教育技术进行整合,才能适应新课程教学改革的需要.充分发挥教育技术专业人才的主导作用,担当教育技术现代化的排头兵.  相似文献   

实时多媒体数据传输的研究及实现     

董芳  吴秀  费新元 《黔南民族师范学院学报》2003,23(3):1-4

本文主要进行RTP／RTCP与TCP协议的比较，着重分析RTP／RTCP协议对分组网上视频业务Qos的保证。在IP电话的实现中编码后的数据流采用RTP／RTCP协议来打包传送。结果表明，开发出的软件实时性好。  相似文献   

8253定时/计数器方式3计数过程的实验研究     

姜华  燕凤灵 《楚雄师范学院学报》2007,22(9):26-29

对于我系选用教材和部分参考资料关于8253定时/计数器在方式3的计数过程中表述中所存在的矛盾之处,基于武汉众友电子科技有限公司的接口实验台,提出了一个探究8253计数过程的实验方案。通过分析实验结果,指出了正确的计数过程。  相似文献   

Three dimensional couette flow and heat transfer through a porous medium with variable permeability     

Chaudhary?R.?C.?Email author  Sharma?Pawan?Kumar 《浙江大学学报(A卷英文版)》2003,4(2):181-185

This paper reports research on the effects of variations in injection velocity and permeability on the heat transfer and flow through a highly porous medium between two horizontal parallel plates situated at constant distance with constant suction by the upper plate. Due to this type of variation in injection velocity and in permeability the flow becomes three dimensional. The governing equations are solved by adopting complex variable notations to obtain the expressions for the velocity and temperature field. The skin-friction along the main flow direction and rate of heat transfer are discussed with the help of graphs.  相似文献   

维生素B1注射液催化合成芳偶姻的研究     

尹爱萍  李志英  刘成琪  赵明根 《商丘师范学院学报》2002,18(5):74-75

报道利用维生素B1注射液催化合成苯偶姻、糖偶姻的方法。收率在60％－85％以上，并与文献对照，确认无误，使用维生素B1注射液作催化剂，产品收率高，无腐蚀、无毒、价廉且易得。  相似文献   

R~n上局部可积函数一个性质的推广     

韩振岭  王汝发 《赣南师范学院学报》1997,(6)

文［１］中王士林教授给出了一个有用的引理，本文将该引理进行推广，利用该引理为研究Ｌｉｔｌｅｗｏｏｄ—ｐａｌｅｙｇλ—函数和Ｌｕｓｉｎ面积积分函数提供了有力工具  相似文献   

Consolidation behavior of cement- and lime/cement-mixed column foundations   总被引：1，自引：1，他引：1  

蔡袁强  徐长节 《浙江大学学报(A卷英文版)》2002,3(5):507-512

The consolidation behavior of mixed in place cement- and lime/cement-mixed column was studied. Consolidation of the composite foundation was modeled as a three-dimensional axi-symmetric problem. The authors used the finite difference method to obtain the pore pressure variation with time at any location below the surface. A computer program developed by the authors was used to draw some interesting conclusions about the consolidation behaviors of cement- and lime/cement-mixed pile foundation. Finally, a combined model including the permeability coefficients of cement-mixed piles and soil, was studied and its feasibility was evaluated. Project supported by National Natural Science Foundation of China (No. 59908012) and Education Ministry of China  相似文献