T4钢生产检验中热处理工艺问题分析

本文针对г4钢目前生产、检验中热处理工艺问题,结合金相组织观察进行分析,提出了今后生产中的罩式炉高温回火工艺制度及检验中的新的调质工艺制度,并要求应该控制г4钢终轧温度及罩式炉单次装炉量。     

配套大型烧结机检验工艺配置分析

在介绍配套大型烧结机检验工艺流程及设备配置的基础上,从原料检验到烧结矿检验全过程取样、检测分析配置特点,并与同行业烧结系统的检验工艺配置进行了对比分析,指出现有配置中的不足与优势。     

宽厚板碳素结构钢Q235B的试制

本文介绍了鄂钢宽厚板厂试生产碳素结构钢Q235B的轧制工艺;检查了试制成品的表面质量、外形和尺寸等,对其力学性能和金相组织进行了检验,并对检验结果进行了分析。从结果来看,轧制工艺比较合理,钢板综合性能优良。     

Г4钢生产检验中热处理工艺问题分析

本文针对Г４钢目前生产、检验中热处理工艺问题，结合金相组织观察进行分析，提出了今后生产中的罩式炉高温回火工艺制度及检验中的新的调质工艺制度，并要求应该控制Г４钢终轧温度及罩式炉单次装炉量。     

TPQC系统在冷轧产品质量管理中的应用

为实现冷轧产品质量稳定控制,使产品质量得到用户认可,结合冷轧产品质量检验判定,介绍了唐钢高强汽车板有限责任公司TPQC系统基本流程,重点从打磨检验、最低工艺速度检验、涂油检验、钝化检验、锌层重量检验、带钢卷取方式检验和带钢头尾剪切长度检验方面对TPQC系统在冷轧产品质量检验判定中的应用进行介绍,并指出TPQC系统存在问题及改进方向。     

Inconel 600 合金材料的焊接研究

介绍了Inconel 600合金材料特性、焊接性分析、焊接工艺以及检验等方面内容.通过焊接试验研究和生产实践,该工艺已成功地应用于氧化反应器的生产.     

低倍检验在铸坯质量控制中的应用

介绍了低倍检验技术在邢钢铸坯质量控制中的应用情况,根据低倍检验结果并结合工艺分析判定缺陷成因提出了改进建议.     

包钢重轨取消缓冷工艺的研究

文中详细介绍了包钢重轨缓冷工艺的由来,取消重轨缓冷工艺的必要性和可行性,取消缓冷工业试验对成品重轨氢含量、残余应力、白点检验和力学性能的影响,并提出了取消缓冷工艺后应注意的问题.     

20MnVB钢热处理工艺与其组织和性能之间的关系

由于20MnVB钢的特殊性导致其综合机械性能不稳定，一次合格率较低。此试验应用正交试验设计，对化学成分固定的20MnVB钢的热处理工艺、组织、性能之间关系进行了分析，选择出最佳的热处理工艺，以指导生产检验，提高一次合格率和检验合格率，降低检验成本。     

百花岭选矿厂LAROX压滤机板框组辊轴密封件模具设计

结合压滤机板框组辊轴密封件具体情况,本文从零件结构分析入手,通过加工工艺方案制定、工艺计算以及模具工作部分尺寸计算,给出了模具的总体设计、模具的装配和检验。     

Falling short of Pap test guidelines

OBJECTIVES: This article examines the associations between women's characteristics and getting or not getting a Pap test. DATA SOURCE: The data are from the 1994/95 National Population Health Survey (NPHS) conducted by Statistics Canada. ANALYTICAL TECHNIQUES: Multivariate logistic regressions were used to determine the odds of women not complying with Pap test guidelines, that is, of never having had a Pap test, and among women who had had one, of not having done so in the last three years. MAIN RESULTS: One in four women aged 18 to 69 had either never had a Pap test or had not had one in the three years before the NPHS. Notably, older women--who are at the greatest risk for cervical cancer--are less compliant with screening guidelines than younger women. Other characteristics of women with high odds of never having had a Pap test are: being single, being a resident of Quebec, having immigrated to Canada, having less than a secondary school education, not being in the highest income group and having had no sex partners in the previous year.     

The oxytocin challenge test

In a group of 152 high-risk pregnancies, 266 oxytocin challenge tests were reviewed. There were 137 patients with persistently negative oxytocin challenge tests with only one false-negative test being recorded. Fifteen patients who displayed a positive test at some time in their antepartum course are discussed along with other aspects of the oxytocin challenge test.     

A partially grouped logrank test

We propose a modified version of the standard logrank test for survival data in which the first contribution to the statistic is based on grouping of data before a pre-selected grouping time. The grouping is accomplished by artificially constructing the first table based on the product limit estimates of the proportions surviving at the grouping time. Remaining contributions to the statistic are identical to that of the standard logrank statistic. The approach has the advantage of being uninfluenced by non-proportional hazards differences prior to the grouping time while being almost as efficient as the usual logrank test for proportional-hazards alternatives. The statistic is particularly useful for interim monitoring in situations where early difference between treatments are unimportant and/or lagged treatment effects are anticipated. We report simulation studies to verify and investigate the test's properties.     

Validation and revision of a test in use.

The problems of evaluating a test when it is being used are discussed. Data are presented for a test when "in use" and in a "give but don't use" condition. Emphasis is placed upon the effects of indirect curtailment when a test is being correctly used with other valid selection instruments. This phenomenon presents problems both for evaluating a test and for the appropriate weighting of tests in a battery. This may be a major problem in applied selection research programs. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

磁化水对膏体料浆管道输送摩阻损失影响试验研究

为了探究磁化水对膏体料浆管道输送流变性能的影响,基于自制的L型斜管试验装置,运用正交试验设计法进行了不同磁化条件下膏体料浆自流输送室内物理模拟试验,对试验结果进行优化组合筛选。结果表明：在适宜的磁化条件下,磁化水能够有效改善膏体料浆流变性能,降低料浆屈服应力和塑性黏度,提高膏体料浆管道输送可靠性。与空白组对比,当磁感应强度B=200~300 mT,磁化时间T=15~25 min,水循环流量为0.5~1.5 L/s时,膏体料浆摩阻损失最小,屈服应力降低8%~20%,塑性黏度降低12%~35%。     

攀枝花选矿厂选别流程中过滤溢流的处理研究

针对密地选矿厂现有选别流程中过滤溢流处理不合理、精矿品位不稳定现象，提出了过滤溢流集中处理的流程改进方案,并通对实验室试验和工业试验，验证了改进流程的合理性。     

综合利用锌浮渣制备超细活性氧化锌的扩大试验研究

研究用硫酸浸出锌浮渣制备超细活性氧化锌粉体的扩大试验。试验结果表明：小试提供的工艺条件是可行的；在小试的基础上，扩大试验提高锌溶液的浓度和沉淀剂的浓度．以减小回收硫酸铵的难度；超声波辐射时间不少于30min．微波煅烧时间也不少于12min。采用日本岛津产EPMA-1600型电子探针对产物的微观结构、粒度和形态进行表征。结果表明：超细活性氧化锌的形貌为球形．且分散均匀，粒度均匀，其平均粒径为100nm．比表面积为41m^2／g。     

Predicting adaptation to presymptomatic DNA testing for late onset disorders: who will experience distress? Rotterdam Leiden Genetics Workgroup

The first comparative study on predicting post-test distress (conceptualised by intrusion and avoidance, measured with the Impact of Event Scale) after presymptomatic genetic testing for Huntington's disease (HD, n=25), cancer syndromes (familial adenomatous polyposis (FAP, n=23)), and hereditary breast and ovarian cancer (HBOC, n=10) is reported. The variables with the highest predictive potential of post-test distress are presented. Participants who were depressed before the test were more distressed after testing, but we found that those who were anxious before the test were less distressed, that is, had less intrusive thoughts post-test. Other factors associated with a higher level of post-test intrusion were gender (being a woman), having children, and pre-test intrusion. Religion and being at risk for HBOC were associated with less post-test intrusion. Participants who showed avoidance behaviour before the test and those who had many people available for support showed more avoidance behaviour post-test. The test result did not additionally contribute to post-test distress. The prima facie simple notion that the test result, as such, determines the distress experienced seems to be a misrepresentation of the complex reality.     

钢包底吹氩卷渣临界条件的水模型研究

以钢厂70t钢包为原型,建立模型与原型尺寸比为1:2.75的水模型。通过水模型实验对钢包临界卷渣吹氩量进行测量,得到临界卷渣气量是450 L/min。实验测量不同吹气量下钢包液面水平流速,分析水平流速与钢包卷渣的关系,得到钢包临界卷渣的液面流速为0.652m/s、韦伯准数为6.967。讨论了采用临界卷渣韦伯准数计算临界卷渣液面流速,通过测量达到临界卷渣液面流速时的吹氩量,来确定临界卷渣吹氩量的方法。     

Using threshold analysis to improve medical decisions

Physicians can improve their medical decision making by considering the risk-benefit ratio, characteristics of a diagnostic test, and the probability of disease. Several threshold values of probability were defined. The treatment threshold is used when a diagnostic test is not being considered. If the probability of disease is greater than the treatment threshold, then treatment should be administered. If a test is being considered, then the test threshold and the test-treatment threshold should be used to determine if testing is indicated. If the probability of disease is less than the test threshold, then no treatment and no testing are the preferred options. If the probability of disease is greater than the test-treatment threshold, then treatment without testing is preferred. If the probability of disease lies between the test and test-treatment thresholds, the test should be performed.