浅析图书馆有色金属公共信息服务平台的建设

为了充分发挥图书馆的技术资源优势,缓解企事业单位文献信息资源不足的矛盾,我馆提出建设一个有色金属公共信息服务平台,使图书馆更好地为我市地方经济建设服务,提升图书馆的服务能力和服务水平;更好地发挥图书馆的窗口作用和纽带作用,与地方搭起一个连接的桥梁,更好地为市政府和我市各企事业单位服务。     

论《背影》的感恩主题对学生的教育作用

我国现代著名的作家朱自清先生的《背影》成功地刻画了父亲送儿子时爬铁道去买橘子的背影,这一"背影"是中国现代文学史上第一位正面父亲形象。对这一形象的准确理解和感知,在当今对学生进行感恩教育有促进作用。     

三螺杆挤出机常规螺纹元件挤出过程的CAE研究

利用ANSYS软件分析了三螺杆挤出机常规螺纹元件中等温非牛顿流体的压力场、速度场和粘度场，并和双螺杆挤出机常规螺纹元件进行了比较，尤其对流道中心区进行了重点研究。结果表明，三螺杆挤出机的混合性能好于双螺杆挤出机；中心区的物料压力梯度和速度梯度都较小，物料在中心区流动缓慢，中心区的物料粘度值较大；对反应时间不宜过长的聚合物，应避免使用三螺杆挤出机。     

Bone Tissue Response to the Bone-like Tissue Coating on Titanium

The objective of this study was to investigate the effects of mineralized bone nodules, formed in vitro by bone marrow stromal cells(BMSCs), on the new bone formation in bone defect and on implant surface. The mineralized bone nodules were generated by culture of Lewis rats BMSCs on titanium disks in osteogenic induction medium. The gap-healing animal model was used to create the bone defect facing the disk. The titanium disks in the presence of B group or in the absence of NB group bone nodules were randomly placed into one of the rat distal femurs. This self-control design was used to compare the bone formation in defects and on titanium surface, by Micro-CT, fluorescence staining, histological and histomorphometric analysis. The new bone formation parameters in bone defect area of B group were significantly higher than those of NB group at 2 weeks, including bone volume fraction, trabecular thickness and bone area ratio. The bone nodules pre-stained with Alizarin red disappeared mostly at 2 weeks, while the red fluorescence reappeared in the newly formed bone away from the disk surface. For the bone-implant contact, B group showed lower values than NB group at 2 weeks, but no significant difference was found at 4 weeks. Our results indicate that the mineralized bone nodules can be resorbed in vivo and promote the early osteogenesis in the bone defects, and bone nodules may be applicable for new bone generation in bone defect or modification of tissue engineering scaffold.     

Formation and thermal stability of amorphous Ni-Mo-P alloys

The experimental researches on the chemical deposition of Ni-Mo-P amorphous alloys were carried out by adding Na2 MoO4 into acidic solutions. The optimum technology conditions were obtained by orthogonal design experiments. The structures and the relationship between compositions and their thermal stability were studied by energy spectrum (EC), scanning electron micrograph and X-ray diffraction spectrum. Compared with Ni-P amorphous alloys, the Ni-Mo-P amorphous alloys have high crystallization temperature and thermal stability, and the hardness reaches its peak when the annealing temperature is 500 ℃. With the increase of the heat treatment temperature, the surface morphology of the alloys changes.     

CA6140车床数控改造中机械装置设计技巧

介绍了普通车床数控改造中机械装置的几个独特设计，使得数控车床纵向进给系统结构更简单、性能更可靠、装拆更方便。     

Trust-based group services selection in web-based service-oriented environments

Multi-agent technologies have been widely employed for the development of web-based systems, including web-based e-markets, web-based grid computing, e-governments and service-oriented software systems. In these service-oriented systems, service provider agents and service consumer agents are autonomous and rational entities, which can enter and leave the environments freely. For simplicity, we use terms ‘provider’ and ‘consumer’ to represent this two types of agents. How to select the most suitable service providers according to a service request from a consumer in such an open environment is a very challenging issue. In this paper, we propose an innovative trust model, called the GTrust model, for service group selection in general service-oriented environments. In the GTrust model, the trust evaluation for a service group is based on the functionality coverage of the group, the dependency relationships among individual services in the group, the ratings of individual services on the attributes of the service request and a similarity measurement of the extent to which reference reports can reflect the service request in terms of the priority distribution of attributes. The experimental results and analysis demonstrate the good performance of the GTrust model on the service group selection in service-oriented environments.