轧辊表面电火花毛化参数优化

针对EDT电火花毛化机床毛化后轧辊表面出现的纵向条纹缺陷，根据毛化机床工作原理和运行特点，通过开展毛化机床放电电流、脉冲放电周期、轧辊旋转速度及横移速度等参数的优化试验，明确了毛化轧辊表面纵向条纹具体原因，发现轧辊横移速度与旋转速度的合理设置能有效避免毛化辊表面漏毛化。并通过对漏毛化产生的具体原理分析，总结了轧辊毛化过程轧辊旋转速度及横移速度匹配经验公式，依据总结的经验公式完成了轧辊旋转速度与横移速度的优化，最终消除了轧辊表面条纹缺陷。     

浅析电火花毛化轧辊表面处理工艺技术

介绍了电火花毛化技术的特点、基本原理、物理化学过程、电火花毛化机床的主要配置及目前常用的两种毛化方式,并对两种毛化方式进行了分析对比.     

喷丸毛化和电火花毛化技术在热浸镀锌线的应用

对比了喷丸毛化和电火花毛化两种毛化工艺对镀锌产品表观质量、板面粗糙度、板面缺陷的影响,同时分析了轧制过程中厚镀层对轧辊表面的影响,为后续生产不同要求的产品选择合适的工作辊毛化工艺提供了技术参考。     

冷轧辊三种毛化工艺的比较

通过对喷丸、电火花毛化和激光毛化工艺特点进行比较,力争寻找出提高轧辊表面质量的最佳途径.     

电火花毛化的电参数及稳定性分析

电火花毛化是轧辊表面加工技术之一,用电火花毛化轧辊生产的冷轧钢板具有优良的表面形貌、表面质量、涂层和深加工性能.文章研究了电火花毛化过程中,电参数与毛化表面粗糙度的关系、电火花毛化加工中电参数和极间距对放电状态稳定性的影响.     

轧辊表面形貌与电加工参数关系的研究

分析了衡量冷轧钢板和毛化轧辊的主要表面形貌参数,通过实验研究了电火花加工参数对表面形貌的影响,并建立表面特征参数与电加工参数的关系模型.由于实验材料和实验方法与实际轧辊电火花毛化基本相同,所以所得结果对轧辊表面毛化技术的研究具有实际意义,可以用于轧辊毛化过程的表面形貌预测和控制.     

邯钢2180mm连退平整机工作辊毛化参数的优化

简述了电火花毛化机的工作原理,分析了轧辊毛化程序中各参数对轧辊表面粗糙度 Ra和峰值密度Pc的影响,通过对连退平整机工作辊毛化参数的优化获得了带钢质量要求的表面粗糙度和峰值密度。     

冷轧薄板表面粗糙度微观形貌的测试分析

对喷丸毛化、电火花毛化、激光毛化三种工艺处理后的轧辊轧制的冷轧薄板，由GBS-60杯突试验机进行冲压成形，用扫描电镜进行了观察分析，对比其变形前、后的微观表面粗糙度形态特征。结果表明，扫描图像与测试的粗糙度参数值相吻合，并能形象、直观地反映出粗糙度的均匀性；从变形后的扫描图像可以分析钢板的塑性变形行为。     

铝板激光无序毛化技术可行性初探

通过对比分析电火花和激光毛化工艺原理,对无序毛化工艺进行了探究,并完成了首次工业化尝试生产。对不同毛化后的铝板表面形貌进行分析的结果表明,通过合理的激光毛化工艺设计,可以获得无序表面形貌的铝板。并且毛化后的铝板表面在具有较高粗糙度的情况下,可进一步提高峰值密度数,其数值可以达到140以上,大大提高了铝板的冲压性以及涂漆性能。与传统的电火花毛化技术相比,激光无序毛化技术具有更大的技术优势,值得推广应用。     

轧辊电火花毛化工艺的建模研究及参数优化

为了更精确地控制轧辊毛化粗糙度,提高毛化质量,研究了电火花毛化原理。以Sarclad电火花毛化设备的实验数据为基础,建立了毛化粗糙度与脉宽和电流的数学模型。同时分析了毛化间隙和脉间对毛化质量的影响规律,提出有效控制毛化质量的方法。认为脉宽和电流是影响辊面毛化粗糙度的主要因素,二者组合,能够有效调整毛化粗糙度的数值范围;毛化间隙和脉间对毛化粗糙度数值影响较小,但对毛化稳定性和毛化质量影响较大。当其他参数确定后,调整毛化间隙和脉间能够提高毛化稳定性,改善毛化质量。     

转炉炉壳热应力分析

根据实际转炉建立实体模型。以有限元为手段,考虑了炉衬和炉壳材料的物性参数随温度变化的特点和炉衬与炉壳之间膨胀间隙,计算了转炉炉壳在温度载荷和炉衬膨胀压力同时作用下的热应力。所得结果可为转炉炉壳设计提供依据。     

Concept of freedom of infection of animal flocks

Totally negative results of epidemiological investigation of random samples do not prove the absence of the infection as the pathogen may be restricted to only a few animals in the herd for a long time. The statement "absence of infection" is critical for such situations. The question is raised, whether the statement "absence of infection" should be generally avoided. Classification of herds and flocks according to the prevalence of the pathogen would be more valid for the implementation of control measures.     

显微维氏硬度测量不确定度评定

对显微维氏硬度测量不确定度进行评定，建立了不确定度计算的数学模型，确定了影响实验结果的各项因素，计算出了各因素的标准不确定度，得出结果的扩展不确定度，并给出最终测量结果的表达式。     

The effect of amount of possession of the trait of hostility on accuracy of perception of hostility in others.

Some theories of personality hold that an individual's perception of others is influenced by his own personality characteristics; more specifically, that a trait of low social value will be projected more into others, and that insight into the possession of these characteristics reduces this distortion. These 2 hypotheses were tested by having a group of college students rate each other (including themselves) on degree of friendliness or hostility. Agreement with group rating about self yielded the insight score. In general, the hypotheses were supported; the "friendly" Ss were most accurate in their perception of others, and insight was positively associated with accurate perception. From Psyc Abstracts 36:04:4HL16M. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Comparison of rates of infection of two methods of emergency ventricular drainage

The rates of infection of two methods of external ventricular drainage in use at Atkinson Morley's Hospital--namely, (a) percutaneous drainage with Rickham reservoirs and (b) tunnelled ventriculostomies--were compared in this retrospective review. Percutaneous drainage of CSF with Rickham reservoirs was associated with a 27% rate of infection as identified by positive microbiological cultures; tunnelled ventriculostomy catheters had a 10% infection rate. The difference in the infection rate between the two methods was statistically significant (P < 0.015). Other variables examined, including the age and sex of the patients and the reasons for ventricular drainage, were not associated with an increased rate of infection. Most infections from either method were caused by a coagulase negative staphylococcus. The average duration of ventricular drainage before identification of positive cultures was 5.7 days for Rickham reservoirs and 6.0 days for ventriculostomies.     

浅析《野草》的版画特征

鲁迅先生一生热爱美术作品,对版画中木刻兴趣尤甚.<野草>作为其"写心之作",亦呈现出一些与木刻版画一致的审美特征:一是具有木刻版画的色彩特征,多对比、多冷色,有阴郁的美感;二是具有木刻版画的力度特征,环境描写、人物刻画处处刀锋毕现,遒劲有力,有一种"力之美".     

四辊破碎机车刀架的改造

针对四辊破碎机车刀架车削中存在的几个问题,详细介绍了电动车刀架的结构和工作原理,建立主要设计参数的数学表达式,并进行适当的分析。改造后,这种电动车刀架运行平稳、可靠、方便、省力,取得了预期的效果。     

2008年中国电解金属锰发展态势浅析

对中国电解金属锰发展的市场态势、价格行情以及原材料供应情况作了初步分析,提出我国电解金属锰行业挑战与机遇并存,只要抓住机遇、迎接挑战、夯实基础、科技创新,电解金属锰行业前景将会更加光明。     

Replication of dimensions of locus of control.

Employed 120 male and 113 female undergraduates in a replication of H. L. Mirels's (see record 1970-10386-001) study which found 2 factors in analyzing responses to 23 items on Rotter's Internal-External Control Scale. The same polar dimensions of "luck" as the arbiter of life events as opposed to personal control were found as well as a 2nd dimension of degree of control over political and social institutions. (PsycINFO Database Record (c) 2010 APA, all rights reserved)