嵌入式程序辅助调试软件设计

设计了嵌入式装置程序的调试协议,并开发了辅助调试工具软件,具备程序下载、文件上装、变量调试、内存查询等功能。软件基于C++和QT组件库开发,可跨平台运行,界面友好,其中可调试动态分配的内存变量方便了嵌入式程序的问题诊断,显著提高了应用人员的开发效率。     

换热器的管束支撑结构发展概况

综述了管壳式换热器壳程内换热管束支撑结构的发展概况.管束支撑由传统的弓形折流板发展为多种结构形式的折流杆、整圆形孔板和螺旋折流板等,不但提高了换热器整体传热性能,而且还大大降低了壳程流动阻力.可为换热器的结构优化和性能完善提供参考.     

生物综合毒性监测技术进展与多源生物预警体系

为进一步推动生物综合毒性监测技术的应用,对发光菌、藻类、溞类和鱼类作为指示生物进行生物综合毒性测试的研究进展进行了总结,分析了4种指示生物在综合毒性测试中的优点与不足,发现了不同指示生物在检测范围、检测时间及检测限方面存在的明显差异。研究结果表明:相对于现实复杂的污染物构成现状,单一指示生物难以全面、高效、客观地检测评价污染物的毒性,需要将4种指示生物进行联合预警,充分发挥不同指示生物的优势,才能达到最佳的预警效果。在已有研究的基础上提出了多源生物联合预警技术体系,并在丹江口水源区对17种常见典型污染物进行了测试研究。测试结果表明,多源生物预警技术能显著提高预警效率。     

复合型调湿涂料的研制及实验研究

将硅藻土做成乳胶型涂料，并得到了不同湿度下这种涂料的吸放湿性能曲线，但是吸放湿能力不是很理想。为了提高涂料的吸放湿能力，在基料中加入无机成膜物质制成硅藻土复合涂料，结果表明，通过复合，最大吸湿能力从6．5％提高到11％，最大放湿能力从5％提高到10％，并且确定了无机成膜物质的比例。复合涂料符合建筑涂料的常规性能要求，在调节湿度的同时克服了传统空调能耗高的缺点，具有很好的应用前景。     

巴西农药新政策促使农药迅速增长

1989年巴西农药市场销售记录为9.805亿美元,生产厂出口中间体和原药1.2亿美元,进口3.77亿美元。除草剂占市场总额51％,为5.07亿美元;杀虫剂销售额是2.23亿美元,占22％;杀菌剂为1.47亿美元,占15％;杀螨剂达0.9亿美元(9％),杀蚁剂仅0.11亿美元。     

基于云计算的幼教资源管理平台实现

云计算作为当今社会关注的焦点,在社会各领域发展方面有着越来越重要的作用,被看作是新一代信息技术变革和业务应用模式变革的核心。在国家十二五规划中,幼儿教育管理和建设是一项重要课题。该文将介绍幼教资源管理平台的实现,及探索在云计算模式下的幼教资源管理平台的构建,该平台主要包括五大模块：用户管理模块、查看资源模块、搜索资源模块、上传资源模块和下载资源模块。幼教资源管理平台的实现,为幼儿教育提供更良好的教育环境。     

Catalysis of Active Carbon Supporting Transition Metal Oxides for Pyrotechnical Reagent with Potassium Perchlorate

In order to improve the pyrotechnical reagent with potassium perchlorate,composite catalyst of active carbon supporting transition metal oxides (TMO),Fe2O3 and CuO,were prepared and added into pyrotechnical reagent with potassium perchlorate.Accelerating rate calorimeter (ARC) was used to study the catalysis of pyrotechnical reagent which is consisted of potassium perchlorate and composite catalyst.Composite catalyst of both Fe2O3 and CuO supported by active carbon can catalyze pyrotechnical reagent with potassium perchlorate.Furthermore,it can lower the apparent activation energy and accelerate the reaction with a smaller quantity than that with Fe2O3 and CuO.The maximal reaction rate of pyrotechnical reagent with potassium perchlorate mixed with Fe2O3/active carbon and CuO/active carbon is 8.31 min-1 and 9.13 min-1,which is 1.74 times and 1.91 times of pyrotechnical reagent mixed with no catalyst;time to maximal rate was 18.99 min and 1.96 min respectively,which is lower than pyrotechnical reagent mixed with no catalyst by 86.46% and 98.67% ;the apparent activation energy is 368.10 kJ·mol-1 and 325.29 kJ·mol-1,which is lower than pyrotechnical reagent mixed with no catalyst by 31.89% and 39.81% respectively.     

Processing and properties of 2D SiC/SiC composites by precursor infiltration and pyrolysis

Two-dimensional plain-weave silicon carbide fiber fabric reinforced silicon carbide (2D-SiC/SiC) composites were molded by stacking method and densified through precursor infiltration and pyrolysis (PIP) process. SiC coating was deposited as the fiber/matrix interphase layer by chemical vapor deposition (CVD) technique. Fiber/matrix debonding and relatively long fiber pullouts were observed on the fracture surfaces. Additionally, the flexural strength and elastic modulus of the composites with and without fiber/matrix interphase layer were investigated using three-point bending test and single-edge notched beam test. The results show that the fiber fraction and the porosity of 2D-SiC/SiC composites with and without coating are 27.2% (volume fraction) and 11.1%, and 40.7% (volume fraction) and 7.5%, respectively. And the flexural strength and elastic modulus of 2D-SiC/SiC composites with and without coating are 363.3 MPa and 127.8 GPa, and 180.2 MPa and 97.2 GPa, respectively. With a proper thickness, the coating can effectively adjust the fiber/matrix interface, thus causing a dramatic increase in the mechanical properties of the composites. Foundation item: Project(NCET-07-0228) support by the New Century Excellent Talents in University     

基于小波变换和奇异值分解的数字水印算法

数字水印技术是一种新的数字媒体保护措施,它是将特定的信息嵌入到图像、语音、视频及文本文件等各种数字媒体中,以达到标识、注释及版权保护等目的.本文提出一种基于DWT和SVD相结合的数字水印算法,首先对混沌置乱后的水印奇异值分解,然后将水印的奇异值嵌入到原始图像的小波变换系数中.实验结果显示:其对一般的常见攻击和几何攻击等均具有良好的鲁棒性.