辐照药用淀粉的毒性研究

为确保人们食用的安全,对用~(60)Co-γ射线辐照5kGy的药用淀粉的毒性进行研究。通过90只Wistar大鼠的90天喂养试验及短期致突试验观察,证明辐照淀粉对大白鼠的生长、发育、食物利用率、血象、肝功能均无明显影响,亦未见骨髓嗜多染红细胞微核率、染色体畸变率及多倍体增加,证明无遗传毒性反应。Ames试验也说明辐照淀粉不诱发DNA中碱基对的置换型和移码型突变。病理改变及脏器系数的变化与对照组无显著性差异,未显示出对脏器的毒性作用。经上述实验证明食用辐照淀粉是安全的。     

激光熔覆镍基和钴基自熔合金的研究

本文采用镍基、钴基自熔合金通过激光熔覆获得性能优良的合金覆层,改善了叶片的耐磨性、耐蚀性,达到了提高使用寿命达10倍以上的目的。     

A neural network model for the free-ranging AGV route-planning problem

This paper describes the development of a prototype neural network model for the free-ranging AGV route-planning problem. The vehicle planner operates in quasi-real time. A small planning horizon is set and all transport requests existing at the beginning of a planning horizon are examined. A neural network model is proposed to perform dispatching and routing tasks for the AGVs. Its goal is to satisfy the transport requests in the shortest time and in a non-conflicting manner, subject to the global manufacturing objective of maximizing throughputs. Based on Kohonen's self-organizing feature maps, we develop three efficient planning algorithms for the single and multiple AGV problems. The simulation results indicate that the proposed neural network approach gives very efficient solutions.     

激光入射角对光声信号大小的影响

本文分析了高强度激光斜入射时等离子体共振吸收对光声信号的影响，导出了等离子体共振吸收最强时激光入射角的表达式，得出了激光斜入射时，随着激光入射角的增大，光声信号会出现一个极大值，并通过实验进行了验证。     

对新形势下毕业设计管理工作的思考与实践

分析了目前高校毕业设计的状况、毕业生求职应聘活动以及就业形势对毕业设计造成的影响，提出了改革毕业设计管理制度的一些做法及思路，介绍了有关毕业设计教学实践的初步体会。     

Agile manufacturing of a micro-embossed case by a two-step electromagnetic forming process

A very agile method, that relies solely on simple single-sided tooling, to form open-box-like enclosures with surface detail such as highly embossed surface features is demonstrated and analyzed. For example, this method may be used to fabricate personal electronics cases. The technique uses electromagnetic forces in a two-step process. In the first step a newly developed uniform pressure electromagnetic actuator is used to make a micro-embossed pre-form that can contain very fine surface detail in the part by micro-embossing features in the forming die. This blank is then trimmed. In the second major step electromagnetic flanging is used to give greater depth and steeper walls to the case. Both electromagnetic operations use one-sided tooling and very light equipment. In principle the tooling needed for this type of process can be put to use within days or hours of finalizing the component design and precise tooling tolerances or precise alignment are not required. This work shows the essential feasibility of this approach to manufacturing either small or large lots of components.     

用加氢裂化尾油生产润滑油基础油

天津石化公司炼油厂加氢裂化装置是轻油型的二次加工装置 ,其尾油全部用于循环。通过采用 FDW-1 0催化剂 ,对该尾油临氢降凝 ,在一定的温度、压力下 ,在实验室内得到了粘度指数大于 60的润滑油基础油馏分 ,经白土精制后完全符合润滑油基础油指标     

影响薄膜润滑摩擦系数的主要因素

在自制的摩擦试验机上进行了3组长时间的薄膜润滑实验，测量在不同压力、承载面积、转速等实验条件下的摩擦系数。实验结果表明，在轻载条件下，薄膜润滑的摩擦系数受转速、面积的影响显著；而在重载时，转速和面积表现出对摩擦系数的不敏感性。另外，参照薄膜润滑的有序模型，提出了在正常磨损情况下，摩擦系数和油膜厚度之间具有单向的对应关系。     

石油库工程建设进度管理的探讨

根据影响石油库工程施工进度控制的因素多、易变,较为复杂的特点,介绍了要做好石油库工程建设的进度管理,须制定完善、科学的施工计划,做好施工现场的组织协调,加强对进度计划的控制和检查,督促、帮助施工单位搞好施工组织,加强技术管理,确保总体工程进度等经验和体会。     

胜利油区新增探明储量标定采收率的新方法

在分析影响采收率主要因素的基础上,应用多元回归分析方法,得出了新增探明储量标定采收率的新方法。该方法应用参数包括空气渗透率、地面原油粘度、有效孔隙度和生产井井网密度,参数易取、计算方便,应用近几年新增探明储量区块检验,适应性好,优于胜利油区应用的其他经验公式法。