中锰渣摇包法生产高硅锰硅的研究

通过对中锰渣摇包法生产高硅锰硅合金工艺开发性试验总结，确定了摇包生产的各项参数，为高硅锰硅合金生产提供了一种全新方法。应用该工艺生产高硅锰硅节能、无污染、产品质量好。     

浅谈高硅锰硅合金的生产方法

介绍了生产高硅锰硅合金的几种方法。通过对这些方法选择合适的供电制度及调整矿热炉用料结构等技术措施，找到了切实可行的办法，从而使生产正常进行。     

高硅锰硅合金连续生产工艺探讨

通过对高硅锰硅合金生产过程的分析，找出制约连续生产的限制性环节，并提出了解决设备损坏和出铁口侵蚀的方案，以及工艺过程控制的关键，从而保证高硅锰硅合金的连续生产。     

高硅锰硅合金的生产

简要介绍了生产高硅锰硅合金中应注意的几个问题，即要有较高的炉温，合适的渣型，正确的熔炼操作。     

配加硅铁生产高硅锰硅合金的探讨和实践

简述了生产锰硅合金原工艺的特点，分析了配加７５％硅铁生产高硅锰硅合金的可行性和实用性，总结了该方法的实施效果。     

硅钼蓝光度法测定铬铁中的硅

研究了硅钼蓝的形成条件，分析特性以及三价格的干扰和消防方法，确定了硅钼蓝光度法测定铬铁中硅的分析方法。     

关于高硅锰硅合金的生产与研究

论述了在高硅锰硅合金生产中,通过控制炉温的时间及采用合理的炉渣碱度制度,提高合金中硅含量,以得到稳定的高品级的高硅锰硅合金。     

纯净高硅锰硅合金的生产实践

介绍了纯净高硅锰硅合金的生产工艺，即要有优质的原料、较高的炉温、合适的炉渣碱度和正确的冶炼操作方法。     

生铁中硅的快速分析

对生铁中硅的测定方法进行改进，选用稀H2SO4－HNO3混合酸溶样，采用硅钼光度法，在保持测定方法具有良好的灵敏度、结果具有良好的准确度和稳定性的基础上，提高了分析速度，实现了低硅和高硅试样采用同一种方法进行测定的目标。     

酸分解试样氟硅酸钾容量法测定硅锰合金中的硅

介绍了酸分解试样，氟硅酸钾容量法测定硅锰合金中硅的方法，选择了最佳试验条件，方法简便、快速、准确，具有较好的精密度，已用于硅锰合金中硅的测定，结果满意。     

Eigensolution Method for Structures with Multiple or Close Eigenvalues

A solution method that can calculate the eigenproblem for large structures with multiple or close natural frequencies is presented. The method is formulated by the accelerated Newton-Raphson method for the transformed problem. The method can calculate the natural frequencies and mode shapes without any of the numerical instability that may be encountered in the inverse iteration process with a shift of the well-known methods, such as the subspace iteration method or the determinant search method, which have been widely used for solving an eigenproblem. The efficiency of the method is verified by comparing convergence and solution times for numerical examples with those of the subspace iteration method and the determinant search method.     

Monogenic determinants of familial Alzheimer''s disease: presenilin-1 mutations

The authors describe a new simple noniterative, yet efficient method to estimate the risk ratio in studies using case-parental control design. The new method is compared with two other noniterative methods, Khoury's method and Flanders and Khoury's method, and with a maximum likelihood-based method of Schaid and Sommer. The authors found that the variance of the new estimation method is usually smaller than that of Khoury's method or Flanders and Khoury's method and that it is slightly larger than that of the maximum likelihood-based method of Schaid and Sommer. Despite the slightly large variance of the new estimator compared with that of the maximum likelihood-based method, the simplicity of the new estimator and its variance makes the new method appealing. When genotypic information for only one parent is available, the authors also describe a method to estimate the risk ratio without assuming Hardy-Weinberg equilibrium or random mating. A simple formula for the variance of the estimator is given.     

机械搅拌法与镁喷吹法铁水搅拌能和混匀时间的关系

采用永田进治公式和全浮力模型计算了机械搅拌法和喷吹法的铁水搅拌能,研究了搅拌能和混匀时间的关系,并和水模型的结果进行了比较,分析了两种搅拌能影响混匀时间的原因。结果表明,机械搅拌法的搅拌能力比喷吹法大数倍,在同一搅拌能下机械搅拌方式的混匀时间比喷吹法短。搅拌优势使得机械搅拌法比喷吹法的脱硫率比喷吹法平均高18.61%,带来的副作用是铁水温降要高于喷吹法15℃,以及对耐火材料的侵蚀速度为喷吹法的3倍。     

辐射离散坐标法在柱形炉膛中的辐射传热计算

利用离散坐标法对圆柱形炉膛辐射传热进行了计算,结果与计算精确的区域法的计算结果符合较好;同时又利用离散坐标法和热流法对旋流燃烧室温度场进行比较计算,结果表明:离散坐标法计算结果与文献中实验结果符合较好;离散坐标法具有较好计算精度,可应用旋流燃烧辐射计算中.     

Crack Growth Prediction by Manifold Method

The prediction of crack growth is studied by the manifold method. The manifold method is a new numerical method proposed by Shi. This method provides a unified framework for solving problems dealing with both continuums and jointed materials. It can be considered as a generalized finite-element method and discontinuous deformation analysis. One of the most innovative features of the method is that it employs both a physical mesh and a mathematical mesh to formulate the physical problem. The physical mesh is dictated by the physical boundary of a problem, while the mathematical mesh is dictated by the computational consideration. These two meshes are interrelated through the application of weighting functions. In this study, a local mesh refinement and auto-remeshing schemes are proposed to extend the manifold method. The proposed model is first verified by comparing the numerical results with the benchmark solutions, and the results show satisfactory accuracy. The crack growth problems and the stress distributions are then investigated. The manifold method is proposed as an attractively new numerical technique for fracture mechanics analysis.     

中国岩金地采矿山采矿技术进展及研究方向

中国黄金矿床经历60多年开采之后,目前仍然以岩金开采为主,伴生金及砂金为辅,在岩金开采中,仍然以地下开采为主,露天开采为辅。在地下开采三大类采矿方法中,以浅眼留矿采矿法为主、全面和房柱采矿法为辅的空场采矿法到21世纪初期仍占60%以上,充填采矿法约占30%左右,其余是崩落采矿法和其他组合采矿法。详述了21世纪初期中国岩金地下开采工艺技术特点,探究了中国岩金地下开采采矿技术研究方向,供采矿同仁参考。     

合质金化学法提纯的预处理

简要地论述了合质金化学法提纯预处理的方法目的．其方法分为配金法、配银法及部分配银法．介绍了配银法的工艺流程和各主要生产过程的操作方法及技术条件，并且讨论了以铜优银进行拨珠的可能性及其优缺点，最后得出结论：在有银的情况下仍以配银为好；在无银的情况下，可以铜代银进行泼珠．     

高炉渣中非晶态定量方法的比较分析

 利用观察法、岩相法和X射线衍射法定量分析了某钢厂高炉渣中非晶态含量,得到该高炉渣中非晶态含量大于95%的结论。三种方法中,观察法最简单,但易受人主观因素影响;岩相法需要一定的经验来判断;利用X射线衍射法可以较客观定量高炉渣中非晶态含量。     

铝电解质分子比的X-射线荧光光谱法测定

铝电解质分子比是铝电解生产中的一项重要指标,本文用X射线荧光光谱法测定电解质中各化合物的浓度,达到计算分子比的目的。将研磨到一定粒度的样品在300kN的压力下压成圆片,然后在优化的条件下进行测定。采用电解质标样建立校准曲线,物理和化学影响采用数学方法校正,通过应用软件中的函数计算功能,根据测定元素的浓度自动计算分子比。该方法已用于多元铝电解质分子比的测定,测定结果与X射线衍射法相符。对同一样品进行14次平行测定,所得到的相对标准偏差为0.48%。