锰硅合金冶炼渣型的研究与控制

简要论述了锰硅合金冶炼的渣型特征及其控制方法。     

用Visual J++实现ARX应用程序的动态自动加载

利用AutoCAD提供的COM接口,在Visual J 6.0环境下开发了一个Java应用程序,实现了AutoCAD的动态加载以及ARX应用程序和相应的菜单、工具条的动态自动加载.     

Effect of Rare Earths on Corrosion Resisting Properties of Carbon-Manganese Clean Steels

Rareearthelementshavesignificantactionsinsteels ,includingwipingoffimpurityelements ,trans modifyinginclusions ,andimprovingmicrostructureetal,soaddingappropriaterareearthsintosteelscanef fectivelyimprovetheircorrosionresistingproper ties[1,2 ] .Todaypuri…     

Modeling and analysis of workpiece stability based on the linear programming method

After being located on a machine bed, a workpiece will be subject to gravity and cutting forces during the machining operation. In order to keep the locating precision as well as the production safety, it is necessary to maintain the workpiece stability. In this paper, a linear programming method is proposed for stability analysis of the workpiece. Based on the linear approximation of the friction cone, a quantitative criterion is established to verify the workpiece stability in association with the rationality of the clamping sequence, magnitude of clamping forces and clamping placement. This criterion allows designers to plan reasonably the clamping sequence, magnitude of clamping forces as well as clamping placement. Compared with existing methods, the main advantage of this approach lies in that the sophisticated computing of contact forces between fixture elements and the workpiece is avoided. In this work, both friction and frictionless cases can be easily taken into account in stability analysis. Mathematical formulations of the method are given and some numerical tests are finally demonstrated to validate the proposed method.     

环境美学视野中的山水城市理念

从阐述宜居城市的内涵出发,提出乐居是宜居的最高境界,并进而在此基础上,透过环境美学的视野,分析了山水城市理念与城市乐居追求的内在关联,指出环境美学试图营造的让人乐居的理想居住环境,实际上与山水城市的理念殊途同归．     

BP神经网络在AP1000核电站事故诊断应用中的初步研究

核电站发生事故时,快速准确诊断出事故类型对于应急中采取相应的安全防护措施至关重要。本文采用BP神经网络对AP1000核电站的部分事故进行事故诊断,以部分事故分析结果为训练数据训练网络,以其他分析结果为测试数据,验证网络诊断事故类型时的准确性。结果表明,BP神经网络能正确诊断所分析的事故序列。     

福建连城锰矿在困境中求发展

通过分析近几年制约矿山发展的因素,提出了一系列克服困难的对策,值得多数矿山借鉴。     

B_4C俘获热中子时产生的次级γ光子所致有效剂量的研究

防护装具用含硼材料中10B俘获热中子时,产生的0.48 MeV次级γ光子经过材料自身衰减后对人体造成的有效剂量,与材料吸收热中子(被俘获)所减少剂量作比较,可评价所用屏蔽材料的合理性。通过建立保守的数学模型,在1.5 cm和2.0 cm两种厚度屏蔽材料情况下,分别计算了未经碰撞的γ光子和经康普顿散射的γ光子所致的总有效剂量。得到的屏蔽材料感生γ射线对人体造成的有效剂量,在材料厚度1.5 cm时为0.89 pSv,2.0 cm时为0.85 pSv,它们都不到防护材料所减少的热中子剂量(10.4 pSv)的8.7%,初步证明材料中使用B4C的合理性。     

双能X线吸收法与近红外法测定脂肪含量的评价

用美国Ｌｕｎａｒ ＤＰＸ－Ｌ骨密度仪和日本ＦＶＴＲＥＸ－１０００型近红外仪对９２例人群进行脂肪含量评价。其中７８例为健康人，男性４３例，女性３５例。测定结果女性平均脂肪含量高于男性，两种方法对全部人群的体脂肪测定结果相关系数ｒ＝０．９２１，本文介绍测定原理并对两种方法的优缺点作了评价。     

P53基因、Bcl-XL基因表达对淋巴性肿瘤细胞株辐射敏感性的影响

本文运用PCR－SSCP银染法检测人淋巴细胞恶性肿瘤株8226、U266、Raji、Jurkat、Daudi p53基因状态,RT－PCR半定量检测了Bcx-xL的mRNA的相对表达,DNA片段释放法检测细胞受照后24h的细胞DNA链断裂量,探讨了p53基因功能状态及Bcl-xL基因表达对细胞株8226、U266、Raji、Jurkat、Dsaudi辐射敏感性的影响。结果表明,淋巴细胞恶性肿瘤株8226、U266、Raji、Jurkat、Daudi均存在p53基因突变,高表达Bcl-xL基因的细胞株较低表达细胞株有较强的辐射耐性。