延长锰硅合金矿热炉出铁口寿命的初步探讨

阐述了锰硅合金矿热炉出铁口损坏的机理。有针对性的采用了一些维护措施，延长了出铁口的使用寿命，改善了炉况，提高了产量，降低了生产成本，获得了一定的经济效益。     

控冷电磁站搬迁方案的改进

通过大量的调查研究，查清了电磁站内渗漏水的缺陷，提出了解决方案和具体操作方法，改变了原定的搬迁方案，不仅彻底地消除了缺陷，还节约了大修费，缩短了工期，为生产创了可观的效益。     

抓斗吊车常见故障与解决措施

分析了20 t桥式抓斗起重吊车常见故障及原因,采取了相应的解决措施,从根本上杜绝了吊车的常见故障、节约了备件、降低了生产成本、减轻了维修人员劳动强度及提高了企业的经济效益.     

ZDRH-2000智能集中润滑系统在435m~2烧结机上的应用

邯钢435m2烧结机采用了ZDRH-2000智能集中润滑系统克服了传统润滑的弊端;降低了能源的消耗;减少了备品备件的消耗;大大减少了设备日常维护的工作量;提高了设备生产效率;降低了生产成本。     

民主革命时期中国共产党农业政策对政局的影响

民主革命时期,中国共产党在充分调研基础上制定的农业政策使其社会动员能力发挥到极致,成功地调动了占中国人口绝大多数的农民的政治斗争热情,巩固了中国共产党政权的政治基础;其农业政策调动了农民的生产积极性,发展了农业生产力,保证了战争条件下的军粮民食供给,奠定了革命胜利的经济基础;其农业政策改变了农村阶级力量对比,颠覆了传统农村社会秩序,完成了农村社会秩序的重建,莫定了新民主主义革命胜利的社会基础,最终夺取了全国政权.     

焙烧炉天然气燃烧自动控制系统的研究与应用

介绍了炭素焙烧炉燃烧系统的改造,新型控制系统的功能介绍、使用效果和效益分析,通过改造真正实现了清洁生产,达到了节能效果,改善了工艺水平,提高了产品质量,降低了生产成本,提高了生产效率,改善了工作环境。     

变频器在4#空分油泵控制系统上的应用

叙述了天铁动力厂4#空分系统辅助油泵应用EV2000变频器控制系统的过程,对运行中出现的溢油、油压波动不稳等故障现象原因进行了分析,提出了改进方案.改进后消除了故障现象,实现了闭环控制油泵的转速和启停,减小了对电机和电网的冲击和振动,提高了设备的可靠性,延长了电机使用寿命,保障了生产的顺利进行.     

小铁山矿充填工艺的应用优化与发展

本文针对小铁山矿充填系统设计及生产实际中存在的问题,通过充填工艺的改进和参数的优化,提高了充填接顶率,保证了充填质量,确保了安全生产,降低了矿石的损失和贫化,避免了西部充填频繁爆管的发生,降低了充填成本,提高了矿山的经济效益,保证了矿山的持续、稳定发展。     

TRT顶压控制系统及其安全性的研究与优化

介绍了天钢1~#TRT顶压控制系统,对现有的顶压控制系统进行了分析,在原有差压调节模式的基础上增加了顶压调节模式,将实际操作改为差压调节与顶压调节两种互选模式,提高了系统的发电效率;对旁通阀组的控制进行了优化,优化后极大地提高了系统的安全性,保证了炉顶压力的稳定,延长了设备的使用寿命,产生了较高的经济效益。     

冷床上卸钢液压系统改造

对原液压系统设计及使用中存在的问题 ,进行了分析、计算 ,找出了原因所在 ,提出了改造方案 ,从而有效地提高了液压系统的稳定性 ,减少了设备故障 ,降低了维护强度 ,提高了工作效率。     

金属铋制备方法研究现状及发展趋势

综述了金属铋的提取方法,对比了各种方法的优缺点,指出了各种方法中存在的问题,并提出了金属铋提取方法的发展趋势。     

铁基复合材料轧制技术的研究现状及发展

铁基复合材料被广泛地应用于工业生产中,其制备方法多种多样。介绍国内外轧制复合方法的工艺原理,分析各种方法的优缺点,并简述各种复合轧制方法在工业生产中的应用情况。着重介绍轧制复合法,并探讨了轧制复合法的发展趋势。     

银浸出技术的研究现状

综述了国内外关于银浸出技术的各种方法,主要内容包括氰化法、硫脲法、硫氰酸盐法、硫代硫酸盐法、多硫化物法、卤化物法和其他试剂法等,简要分析了各种方法适用的含银矿石及其利弊。     

Measurement methods and strategies for non-infectious microbial components in bioaerosols at the workplace

Exposure to micro-organisms can be measured by different methods. Traditionally, viable methods and light microscopy have been used for detection of micro-organisms. Most viable methods measure micro-organisms that are able to grow in culture, and these methods are also common for the identification of micro-organisms. More recently, non-viable methods have been developed for the measurement of bioaerosol components originating from micro-organisms that are based on microscopic techniques, bioassays, immunoassays and chemical methods. These methods are important for the assessment of exposure to bioaerosols in work environments as non-infectious micro-organisms and microbial components may cause allergic and toxic reactions independent of viability. It is not clear to what extent micro-organisms should be identified because exposure-response data are limited and many different micro-organisms and microbial components may cause similar health effects. Viable methods have also been used in indoor environments for the detection of specific organisms as markers of indoor growth of micro-organisms. At present, the validity of measurement methods can only be assessed by comparative laboratory and field studies because standard materials of microbial bioaerosol components are not available. Systematic errors may occur especially when results obtained by different methods are compared. Differences between laboratories that use the same methods may also occur as quality assurance schemes of analytical methods for bioaerosol components do not exist. Measurement methods may also have poor precision, especially the viable methods. It therefore seems difficult to meet the criteria for accuracy of measurement methods of workplace exposure that have recently been adopted by the CEN. Risk assessment is limited by the lack of generally accepted reference values or guidelines for microbial bioaerosol components. The cost of measurements of exposure to microbial bioaerosol components may be high owing to expensive analyses and highly variable exposure levels. The use of qualitative indicators of microbial growth, recording of health effects, specific immunoglobulin G antibody levels to prevalent species in serum of exposed workers and stratified sampling may help to reduce the costs of exposure assessment. An example of a combined strategy for assessment of health risks from handling mouldy timber is shown.     

土壤中有效氮、磷、钾测定方法相关性研究

本文通过实验,运用常规方法和速效方法来测定土壤中的有效氮、磷、钾等元素含量,并将两种测定方法结果对比分析,通过作图法来得出两者之间的相关性。     

Delta-Aminolevulinic acid in urine (screening method)

Various methods for determining urinary delta-aminolevulinic acid (ALA) have been devised by many investigators since 1956. This paper introduces a history of the methodology in the determination of urinary ALA and application of some methods. These methods can be divided into two groups; one group consists of colorimetric methods based on the color reaction of ALA-pyrrole with Ehrlich's reagent, and the other group consists of fluorometric methods, based on the fluorescence derivatization of ALA and its separation by HPLC. Colorimetric methods are convenient and inexpensive, while these are less specific. On the other hand, the fluorometric HPLC methods are highly sensitive and specific, while these are expensive because of the high cost of the instruments.     

2014年云南冶金分析年评

评述了云南分析工作者2014年在国内刊物上发表的有关冶金分析的论文,内容包括综述、分离富集方法和分析检测方法。分析检测方法主要包括电化学分析法、分子光谱、原子光谱、滴定法和重量法、以及其它分析方法,引用文献58篇。     

湿化学方法合成LiCoO2的研究进展

文章就钴酸锂的湿化学合成方法络合法、共沉淀法、溶胶-凝胶法、软溶胶-凝胶法、氧化还原溶胶-凝胶、喷雾干燥法等方法合成钴酸锂前驱物以及水热合成法直接合成钴酸锂进行综述,并对一种可以实现资源综合利用的湿化学方法进行预测.     

Bioelectrical impedance techniques in medicine. Part III: Impedance imaging. Second section: reconstruction algorithms

This section is devoted to the reconstruction algorithms published in the literature and developed for reconstructing the electrical conductivity and permittivity inside a body from measurements made on the body surface. These algorithms fall into two main categories. The first, based on linear approximations, are noniterative methods assuming that conductivity does not differ very much from a constant. Examples of noniterative methods are the Barber-Brown back-projection method and related methods, the Calderon's approach, the moment method, and one-step Newton methods. The second class of methods consists of iterative methods, which typically include output least squares for various functions. A related class includes the adaptive methods, in which the applied patterns of current are adjusted to get the best signal. A review of all these different alternatives is presented.     

Database Assessment of CPT-Based Design Methods for Axial Capacity of Driven Piles in Siliceous Sands

Numerous cone penetration test (CPT)-based methods exist for calculation of the axial pile capacity in sands, but no clear guidance is presently available to assist designers in the selection of the most appropriate method. To assist in this regard, this paper examines the predictive performance of a range of pile design methods against a newly compiled database of static load tests on driven piles in siliceous sands with adjacent CPT profiles. Seven driven pile design methods are considered, including the conventional American Petroleum Institute (API) approach, simplified CPT alpha methods, and four new CPT-based methods, which are now presented in the commentary of the 22nd edition of the API recommendations. Mean and standard deviation database statistics for the design methods are presented for the entire 77 pile database, as well as for smaller subset databases separated by pile material (steel and concrete), end condition (open versus closed), and direction of loading (tension versus compression). Certain methods are seen to exhibit bias toward length, relative density, cone tip resistance, and pile end condition. Other methods do not exhibit any apparent bias (even though their formulations differ significantly) due to the limited size of the database subsets and the large number of factors known to influence pile capacity in sand. The database statistics for the best performing methods are substantially better than those for the API approach and the simplified alpha methods. Improved predictive reliability will emerge with an extension of the database and the inclusion of additional important controlling factors affecting capacity.