浦钢30t AOD智能精炼系统和生产实践

简要介绍了浦钢30 t AOD智能精炼系统的设备组成和主要技术参数,论述了工艺流程、原理和特点,以及系统控制的原理和特点,并对一年来的生产实践数据进行了统计和分析,总结了几点生产经验.     

浅析几种粒度分析方法的原理及影响因素

本文介绍了几种常用的粒度仪的检测原理、使用特点，以及不同原理所适用的检测范围和样品特点．并分析了影响测量的因素和解决办法。     

电动机冷却风机变频系统的改造和效果

本文简述了我厂主电机冷却风机变频系统 ,以及交流异步电动机的变频调速原理 ,介绍了变频器的工作原理、特点 ,说明了新旧控制系统的优缺点和节能效果。     

独立学院管理学原理教学方法与手段探析

本文根据管理学原理课程特点,针对独立学院培养模式和学生特点,总结管理学原理课程教学中存在的问题,探讨了改进管理学课程教学的必要性,最后提出了改进教学方法与手段的对策建议.     

内储能清扫技术在转炉气体分析装置中的应用

本文介绍了内储能清扫技术的原理,结合转炉煤气回收取样分析装置,叙述了其清扫装置的结构特点和清扫过程的逻辑控制原理、特点。现场实际应用表明:该技术具有高效率的清扫效果和广阔的应用前景。     

连铸机远程辊缝调节和辊缝值在线检测

分析了舞钢二炼钢2#、3#连铸机远程辊缝自动调节的控制原理和特点,并介绍了轻压下的基本原理和辊缝值在线检测技术的原理。     

冶金传输原理课程的“教”与“学”

冶金传输原理是冶金工程专业的专业基础课,公式多、概念多,给教学带来较大的困难。总结了冶金传输原理课程教学经验,从"教"和"学"两个方面入手,把握冶金传输原理课程的数学性、物理性和应用性特点,促进冶金传输原理课程教学;提高学生自身能力和责任意识,调动学生学习冶金传输原理课程的主动性,取得了较好的教学效果。     

热轧带钢头尾宽度模型控制优化

从带钢头尾宽度的工艺原理出发,从工艺、现场、设备特点及控制原理等方面对短行程控制(SSC)进行了分析,并针对太钢产品的实际特点,研究出不同种类的控制曲线,取得了明显效果。     

水性高温阻锈剂在控冷轧制工艺中的应用

介绍了水性高温阻锈剂的原理与特性和在线穿液装置的设计原理、要点和结构特点,经工业化生产应用,证明有较强的阻锈效果,有广阔的应用前景。     

高压变频器与液力耦合器调速性能分析

介绍了液力耦合器和高压变频器的工作原理和性能特点,对高压变频器和液力耦合器的调速特点进行了比较。     

Increase in energy cost of running at the end of a triathlon

The purpose of the present study was to verify the increase in energy cost of running at the end of a triathlon. A group 11 trained male subjects performed a triathlon (15-km swimming, 40-km cycling, 10-km running). At least 1 week later the subjects ran 10-km as a control at the same pace as the triathlon. Oxygen uptake (VO2), ventilation (VE) and heart rate (HR) were measured during both 10-km runs with a portable telemetry system. Blood samples were taken prior to the start of the triathlon and control run, after swimming, cycling, triathlon run and control run. Compared to the control values the results demonstrated that triathlon running elicited a significantly higher (P < 0.005) mean VO2 [51.2 (SEM 0.4) vs 47.8 (SEM 0.4) ml.min-1.kg-1] VE [86 (SEM 4.2) vs 74 (SEM 5.3) l.min-1], and HR [162 (SEM 2) vs 156 (SEM 1.9) beats.min-1)]. The triathlon run induced a greater loss in body mass than the control run [2 (SEM 0.2) vs 0.6 (SEM 0.2) kg], and a greater decrease in plasma volume [14.4% (SEM 1.5) vs 6.7% (SEM 0.9)]. The lactate concentrations observed at the end of both 10-km runs did not differ [2.9 (SEM 0.2) vs 2.5 (SEM 0.2) m.mol.l-1]. Plasma free fatty acids concentrations were higher (P < 0.01) after the triathlon than after the control run [1.53 (SEM 0.2) to 0.51 (SEM 0.07) mmol.l-1]. Plasma creatine kinase concentrations rose under both conditions from 58 (SEM 12) to 112 (SEM 14) UI.l-1 after the triathlon, and from 61 (SEM 7) to 80 (SEM 6) UI.l-1 after the control run. This outdoor study of running economy at the end of an Olympic distance triathlon demonstrated a decrease in running efficiency.     

Self-evaluation maintenance in marriage: Toward a performance ecology of the marital relationship.

The self-evaluation maintenance (SEM) model was originally developed to integrate distinct literatures on the potential positive and negative consequences for the self of being outperformed by others. Because close others are of particular importance for both of the basic processes thought to underlie the SEM model, committed heterosexual relationships provide an area in which relatively robust SEM effects should occur. In keeping with the expectation that SEM effects would be present among committed, heterosexual, married couples, the current series of studies demonstrated (a) that experimental manipulations of SEM processes influenced the behavior of married couples, (b) that patterns of couple outcomes conformed to predictions derived from the SEM model, and (c) that SEM effects accounted for inaccurate perceptions of partner needs. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Antibody isotypes, including IgG subclasses, in Ecuadorian patients with pulmonary paragonimiasis

An ELISA test was developed to detect Paragonimus-specific antibodies, including IgG subclasses, using P. mexicanus crude water-soluble antigens. The test was standardized to detect antibodies in sera of Ecuadorian patients with pulmonary paragonimiasis and negative controls from the endemic area. The detected mean levels of IgG (0.753, SEM: 0.074) and IgM (0.303, SEM: 0.033) were significantly elevated (P < 0.05). Within the IgG subclasses, IgG4 showed the highest detected mean level (0.365, SEM: 0.116) and the other three subclasses showed considerably lower mean levels (IgG1, 0.186 SEM: 0.06; IgG2, 0.046 SEM: 0.01; IgG3, 0.123 SEM: 0.047). The number of P. mexicanus eggs found in sputum of infected individuals showed a positive correlation with the level of antibodies detected for IgM, IgG and its subclasses (P < 0.001). The relevance of these findings in Ecuadorian patients suffering from pulmonary paragonimiasis is discussed.     

Hyperinsulinism in patients with coronary artery disease

AIM: To assess the clinical impact of hyperinsulinism and major coronary risk factors in patients with angiographically documented or excluded coronary artery disease (CAD), a clinical study was carried out in 268 men admitted for left heart catheterization. METHODS: Fasting immunoreactive insulin (IRI) levels were correlated to all major cardiovascular risk factors and to the presence and degree of CAD. RESULTS: IRI levels were correlated significantly with the degree of CAD (one-vessel disease: mean IRI 9.45 microU/ml +/- 0.43 SEM; two-vessel disease: mean IRI 10.4 microU/ml +/- 0.71 SEM; three-vessel disease: mean IRI 11.88 microU/ml +/- 0.98 SEM) and inversely to the high-density lipoprotein level (P < 0.05). In patients with arterial hypertension, IRI levels were elevated, without a significant difference between those with and those without CAD, whereas the IRI levels of non-hypertensive men with CAD (n = 81; mean IRI 9.85 microU/ml +/- 0.51 SEM) differed significantly (P < 0.05) from those of non-hypertensive men without CAD (n = 59; mean IRI 7.76 microU/ml +/- 0.43 SEM). IRI levels were significantly higher (P < 0.05) in obese patients (n = 65; mean IRI 11.68 microU/ml +/- 0.70 SEM versus n = 203; mean IRI 9.32 microU/ml +/- 0.34 SEM), in patients with elevated triglycerides (n = 58 mean IRI 11.59 microU/ml +/- 0.81 SEM versus n = 210; mean IRI 9.42 microU/ml +/- 0.33 SEM), and in patients with lowered HDL cholesterol (n = 178; mean IRI 11.06 microU/ml +/- 0.63 SEM versus n = 90; mean IRI 9.29 microU/ml +/- 0.34 SEM). Diabetic patients on angiotensin converting enzyme inhibitor therapy (n = 11; mean IRI 7.91 microU/ml +/- 0.91 SEM) had significantly (P < 0.05) lower IRI levels than those not treated with ACE inhibitors (n = 25; mean IRI 12.96 microU/ml +/- 1.47 SEM). IRI levels exceeding 8 microU/ml were associated with a 1.98-fold risk for CAD compared with IRI levels below 8 microU/ml. Stepwise logistic regression showed that insulin was an independent determinant of CAD. CONCLUSION: Knowledge of the fasting insulin level is an important contribution to the identification of patients with, or at risk of, CAD.     

Interrater reliability of six tests of trunk muscle function and endurance

Some studies have shown a relationship between trunk muscle strength and low back pain. Measures of trunk muscle strength and endurance, which are feasible in the clinical setting, are needed. The purpose of this study was to determine interrater reliability of six tests of abdominal and trunk extensor muscle strength and endurance. The tests included abdominal and extensor dynamic endurance, hand-held dynamometry of isometric flexion and extension, and abdominal and extensor static endurance. Thirty-nine healthy workers were recruited as subjects. Each was tested by three raters on 3 days within 1 week. Intraclass correlation coefficients (ICC) and the standard error of measurement (SEM) were calculated: abdominal dynamic endurance ICC = .89, SEM = 8 repetitions; extensor dynamic endurance ICC = .78, SEM = 9 repetitions; abdominal isometric force ICC = .25, SEM = 60 N; extensor isometric force ICC = .24, SEM = 68 N; abdominal static endurance ICC = .51, SEM = 35 seconds; extensor static endurance ICC = .59, SEM = 20 seconds. The dynamic endurance tests had acceptable interrater reliability. For the others, reliability was poor and the SEMs were large.     

Introduction to the Special Section on Structural Equation Modeling.

Structural equation modeling (SEM) is a frequently used data-analytic technique in psychopathology research. This popularity is due to the unique capabilities and broad applicability of SEM and to recent advances in model and software development. Unfortunately, the popularity and accessibility of SEM is matched by its complexities and ambiguities. Thus, users are often faced with difficult decisions regarding a variety of issues. This special section is designed to increase the effective use of SEM by reviewing recently developed modeling capabilities, identifying common problems in application, and recommending appropriate strategies for analysis and evaluation. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

An introduction to using structural equation models in rehabilitation psychology.

Objective: To provide an overview of structural equation modeling (SEM) using an example drawn from the rehabilitation psychology literature. Design: To illustrate the 5 steps in SEM (model specification, identification, estimation methods, interpretation of results, and model modification), an example is presented, with details on determining whether alternative models result in a significant improvement to fit to the observed data. Data are from a sample of 274 people with spinal cord injury. Issues commonly encountered in preparing data for SEM analyses (e.g., missing data, nonnormality) are reviewed, as is the debate surrounding some aspects of SEM (e.g., acceptable sample size). Conclusion: SEM can be a powerful procedure for empirically representing complex and sophisticated theoretical models of interest to rehabilitation psychologists. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Cisapride reduces neonatal postoperative ileus: randomised placebo controlled trial

AIM: To assess the efficacy of cisapride in reducing ileus persisting to the tenth postoperative day after neonatal abdominal surgery. METHODS: A prospective, randomised, double blind trial comparing rectal cisapride (1.4-2.3 mg/kg/day) with placebo over seven days was undertaken in 33 neonates. RESULTS: Seven of 12 (58%) patients receiving placebo and eight of 11 (73%) receiving cisapride achieved a first sustained feed during treatment. Of those receiving cisapride, the first sustained feed occurred at 2.3 days (SEM 0.6) compared with 4.7 days (SEM 0.8) with placebo. By the seventh day the mean daily net enteral balance was 69 (SEM 18) ml/kg in the cisapride subgroup and 17 (SEM 8) ml/kg for those receiving placebo. Stool was passed on 6.3 (SEM 0.4) treatment days in the cisapride subgroup compared with 4.1 (SEM 1.0) treatment days in the placebo subgroup. CONCLUSION: Cisapride is effective in neonates with a prolonged ileus after abdominal surgery.     

A study on heat source modeling of scanning electron microscopy modified for material processing

Scanning electron microscopy (SEM) has been used as a surface measurement instrument and a tool for lithography in semiconductor processes due to its high-density localized beam. For those purposes, however, the maximum current of SEM is less than 100 pA, which is not enough for material processing. In this article, SEM was modified to increase the amount of current reaching a specimen from the gun part where the current is generated. The maximum current of SEM after modifications was measured at up to 10 μA, which is 10⁵ times greater than before modifications. The current reaching the specimen is called the probe current, which can be defined as a heat source for material processing. The electron beam of the probe current scans rapidly over an area defined by SEM magnification. By considering the electron beam scanning period and the reaction between high-speed electrons and solid material, the heat source model of the rapidly scanning SEM electron beam was suggested. The simulation results with suggested heat source by ABAQUS were compared with the experiment results.     

SEM1, a homologue of the split hand/split foot malformation candidate gene Dss1, regulates exocytosis and pseudohyphal differentiation in yeast

The exocyst is an essential multiprotein complex mediating polarized secretion in yeast. Here we describe a gene, SEM1, that can multicopy-suppress exocyst mutants sec3-2, sec8-9, sec10-2, and sec15-1. SEM1 is highly conserved among eukaryotic species. Its human homologue, DSS1, has been suggested as a candidate gene for the split hand/split foot malformation disorder. SEM1 is not an essential gene. However, its deletion rescued growth of the temperature-sensitive exocyst mutants sec3-2, sec8-9, sec10-1, and sec15-1 at the restrictive temperature. Cell fractionation showed that Sem1p is mainly cytosolic but also associates with the microsomal fraction. In linear sucrose gradients, Sem1p cosedimented with the exocyst component Sec8p. In diploid cells that normally do not form pseudohyphae (S288C background), deletion of SEM1 triggered pseudohyphal growth. This phenotype was abolished after reintroduction of either SEM1 or the mouse homologue Dss1 into the cells. In diploids that have normal capacity for pseudohyphal growth (Sigma1278b background), deletion of SEM1 enhanced filamentous growth. The functionality of both SEM1 and Dss1 in a differentiation process in yeast suggests that Dss1 indeed could be the gene affected in the split hand/split foot malformation disorder. These results characterize SEM1 as a regulator of both exocyst function and pseudohyphal differentiation and suggest a unique link between these two cellular functions in yeast.