焙烧过程中Me—Fe—S—O四元系的化学位图

已发表的多是适用性有限的Me—S—O三元系化学位图。全面考察Me—S—O系与Fe—S—O系间的相互作用的Me—Fe—S—O四元系的化学位图、对焙烧过程很重要。根据组合律确定Cu、Ni、Co、Zn等的Me—Fe—S—O四元系中反应的数目。应用相律和对体系中反应平衡计算的综合分析,选用焙烧过程中两主要参数(P_(SO_3)-1/(TK))为坐标、作出了Me—Fe—S—O四元系的化学位图。它能明显示出全硫酸化、选择硫酸化、部份硫酸化、氧化、部份氧化、选择氧化和离解等七种焙烧的条件及其相应的产物。文中简评了Cu、Ni、Co、Zn等的铁酸盐的热力学数据、发现以作者用气体流动法测得的一套数据较为合理。文末也浅谈化学位图在焙烧过程中若干实际应用问题。     

SPHE钢LD—BAr—RH—CC过程夹杂物数量分析

对SPHE钢LD—BAr—RH—CC过程中非金属夹杂物数量的演变及CSP连铸坯断面上非金属夹杂物数量的分布进行了研究,对成因进行了分析。并以此为依据,提出了降低钢水及铸坯中非金属夹杂物数量、均匀铸坯断面非金属夹杂物分布的措施。     

Nd—Fe—B粘结永磁的制备

粘结永磁是近几年发展很快而具有生命力的永磁材料。Nd—Fe—B粘结永磁是形态学上新时代的磁体,具有许多优点,并在很多领域应用,受到人们的重视。本文主要论述Nd—Fe—B粘结永磁的特点和制备过程中的某些问题。     

V—Ti—N微合金钢动态断裂韧性及韧—脆转变的分析

本文采用三点弯曲和示波冲击法分别测定了V—Ti—N钢在不同加载速率下的动态断裂韧性(K_(1d))及其韧-脆转变特性。结果表明,V—Ti—N钢动态断裂韧性具有明显的温度转折特征,其韧-脆转变温度T_(OB)对应变速率十分敏感,并与试验过程中缺口的尖锐程度密切相关。     

中小电炉—连铸—热送—连轧生产线的实践和探讨

本文介绍了中小钢铁企业电炉—连铸—热送—连轧生产线的国外发展概况和实例,并着重对无锡县钢铁厂的实践进行分析探讨。1.国外发展概况和实例国外钢铁企业在七十年代末,八十年代初将连铸热装(CC—HCR)和连铸热直轧(CC—HDR)列为重大新工艺、新技术,对此进行了大量研究和实践。目前 CC—HCR和 CC—HDR 已被公认为较成熟的技术。一些厂家在新建和改建过程中已广泛采用上述工艺,相继建成一批电炉—连铸—热送—连轧生产线(即所谓 mini mill)并取得明显的技术经济效果。日本在连铸、热装、连铸连轧应用上目前处于世界领先地位,50%以上的热轧板(带)轧机采用连铸坯热装料生产。     

4L—20／9—H型焦炉煤气压缩机滑道烧研原因分析

阐述了4L—20／9—Ⅱ型焦炉煤气压缩机十字头滑道频繁烧研的过程，并对烧研原因进行了认真分析。     

K—OBM—S转炉炉衬寿命的提高

本文阐述了我公司K—OBM—S转炉投产以来，通过对炉村的材质、砌筑、使用和维护以及冶炼工艺各方面技术进行研究与开发，炉衬寿命由低到高的一个转变过程。     

β—W向α—W转变过程的研究及转变热的测定

一、前言本文采用 DSC 差示扫描量热计量热,并配合以对试样淬冷进行 X—射线相分析,研究了非自燃β—W 在纯氢流及纯氩流中向α—W 转变的过程。在纯氢流中升温时,非自燃β—W 约在280℃开始绝大部分吸附氧的脱附,脱附热约为71—75kJ/molO_2。β—W 向α—W 的转变约在525℃开始,这是一个散热过程,转变热为-77J/g。可以确定,β—W 是金属钨的     

K—OBM—S转炉冶炼18—8不锈钢的冶金效果

75tK—OBM—S顶底复吹转炉采用预处理铁水和合金为主要原料,与电炉、VOD配合进行18—8不锈钢的冶炼,同AOD炉相比,K—OBM—S冶炼18—8不锈钢过程中脱碳速率≥0．15％／min,最高在0．30％／min以上,脱碳期氧气利用率〉60％,具有高速脱碳、高效用氧特点。而铬的回．收率、渣-钢间硫的分配比平均达到95．29％和40．6,稍低于AOD炉。     

W—Ni—Fe合金烧结过程的电子探针研究

我们经常发现,在W—Ni—Fe合金的生产中,虽然所用的原料W粉很细(～2微米),但经过烧结后制成的合金,其W晶粒却长得很粗大(40～50微米);随着W晶粒的长大,合金强度升高。文献数据表明,W晶粒通过溶解析出再结晶和W晶粒之间合并再结晶而迅速长大。然而对W—Ni—Fe合金在烧结过程中W晶粒长大的历程及长大过程中合金的断裂行为,文献很少报道。     

Investigation of the process of chlorination of tantalate-columbate concentrates

Tantalate-columbate concentrate has been studied; namely, its chemical, phase, and granulometric compositions and radioactivity have been investigated. The thermodynamics of reactions of chlorination of the components of the concentrate have been calculated in the temperature range of 400–1273 K. A technique of laboratory chlorination has been developed and experiments have been performed at T = 750 and 800°C. The products obtained have been analyzed. The total degree of chlorination of the concentrate, as well as of tantalum and niobium, has been determined at various temperatures.     

Psychosomatic treatment of backache

A programme of audit, including clinical audit, organizational audit and patient/clinician satisfaction surveys, has been implemented in nuclear medicine departments throughout the South Thames Regional Health Authority (RHA). The clinical topics which have been audited include. ventilation-perfusion lung imaging, bone imaging, liver imaging, thyroid imaging and renal static DMSA imaging. Guidelines have been set for nuclear medicine practice in each of these areas against which further audit can be performed. Organizational audits have been performed in 10 nuclear medicine departments in the South Thames RHA and a confidential report supplied to the head of each department, consisting of findings and recommendations. A programme of re-audit has also commenced. The main findings have been a lack of facilities and space. Patient satisfaction surveys have been implemented in nine departments and a high level of patient satisfaction has been demonstrated. A clinical satisfaction survey has been implemented in 13 departments. It is hoped to continue this successful programme of audit to improve nuclear medicine practice by closing audit loops.     

Pulse Reverse Electrodeposition of Cu-SiC Nanocomposite Coating: Effects of Surfactants and Deposition Parameters

Cu-SiC nanocomposite coatings have been deposited from an aqueous sulfate electrolyte using the technique of pulse reverse electrodeposition both in the absence and presence of three different types of surfactants, anionic, cationic, or nonionic. The effects of different electrodeposition parameters on some properties of the coatings have been studied. In all cases, it has been observed that the surface roughness, hardness, and resistivity increase with the increase in cathodic current density. However, they have been observed to decrease with the increase in anodic current density and the anodic current time. The variation in the amount of incorporated reinforcement with different deposition parameters has been observed to be dependent on the nature of the surfactant used. In the presence of cationic and nonionic surfactant, a noticeable increase in the amount of incorporated reinforcement and hardness has been observed. Samples prepared under higher anodic current density have been observed to possess lower stress, but intense texture. An increase in cathodic current density has been observed to decrease the extent of texturing.     

Effects of Random Material Properties on Buckling of Composite Plates

Composites exhibit a considerable amount of variation in their material properties because their fabrication∕manufacturing process involves a large number of parameters that cannot be controlled effectively. In the present study, the material properties have been modeled as random variables for better prediction of the system behavior. The classical laminate theory and first-order and higher-order shear deformation theories have been employed in deriving the governing equations for buckling of laminated rectangular plates. A mean-centered first-order perturbation technique has been used to find the second-order statistics of the buckling load. The approach has been validated by comparison with results of Monte Carlo simulation. Typical results have been presented for a plate with all edges simply supported. The effectiveness of the theories in predicting the buckling load dispersions has been examined. The sensitivity of buckling loads to change in the standard deviation of random material properties and to system parameters—side-to-thickness ratio and aspect ratio—has been examined for cross-ply symmetric and antisymmetric laminates.     

火焰切割机控制系统的改进

火焰切割机在自动控制状态下切割钢坯时，易出现切割机部件损坏，切割介质消耗多的情况。对火焰切割机的PLC自动控制程序及控制系统中控制部件进行改进，实现了火焰切割机的高效可靠地切割钢坯，避免了火焰切割机部件的容易损坏状况，同时达到了节能降耗的目的。仅乙炔消耗，每年可节约100多万元的切割费用，取得了很好的改进效果。     

高炉-转炉区段物流过程解析

通过对高炉一转炉区段物流过程的、提出该区段经历3次大的发展,形成2种典型布局.简要论述了各工序功能;着重阐述了该区段流程布局的变化及工序间衔接、匹配的重要性;总结出流程布局发展的必然性和本质特点。     

板坯连铸机弯曲段有限元分析

根据CAD二维设计图,在INVENTER中建板坯连铸机弯曲段的三维实体几何模型,再将该几何模型导入有限元分析软件ABAQUS中完成有限元建模,在此基础上完成弯曲段有限元分析。分别计算和比较了原始设计方案和四种优化方案下弯曲段的位移和应力,计算结果为板坯连铸机弯曲段的设计提供了依据和参考。     

The biology of prothrombin

Prothrombin and thrombin are involved in diverse biological functions. The structure of prothrombin has been studied extensively and its cDNA has been cloned from several species. The tissue-specific expression of this protein has been studied, as well as the developmental expression pattern. The structure of the human gene coding for prothrombin has been determined, and gene regulation studies have been performed that indicate that HNF-1 might be responsible for the liver-specific expression of this protein. Other regulatory elements have been identified. In order to further study the biological properties of prothrombin, prothrombin-deficient mice have been generated using gene targeting technology. Prothrombin deficiency in mice results in partial embryonic lethality. The mice that survive to birth die from bleeding events. The embryonic lethality occurs between embryonic days 9.5 and 11.5 and appears to be due to the loss of integrity of the vasculature due to a failure in blood coagulation. These results indicate that prothrombin plays not only a key role in hemostasis but suggests that it may be important for mouse development.     

Sensing and modeling of the hot isostatic pressing of copper pressing

A detailed experimental evaluation of mathematical models for densification during hot isostatic pressing (HIP) has been conducted using high purity copper powder as a model system. Using a new eddy current sensor, the density of cylindrical compacts has been measured in situ and compared with model predictions for the HIP process. Pressure shielding by the can has been found to influence the densification, and a simple plastic analysis of a thin-walled pressure vessel was used to account for its effects in the models. The existence of a low temperature creep mechanism during consolidation has been found and a formulation to account for its contribution to densification has been developed and implemented in the models. Other effects, believed to be associated with transient creep and the temperature dependence of power law creep parameters, have also been observed in the experiments and suggest the need for further model refinement.     

红外吸收法测定钢铁中碳含量的测量不确定度评定

通过对红外吸收法测定钢铁中碳含量的各种不确定度因素进行分析,评定了测定碳含量的测量不确定度,从而明确了提高分析准确度的方法。