Zur Untersuchung und Beurteilung von K?se

Ohne ZusammenfassungMitteilung aus dem Chemischen Untersuchungsamte der Stadt Chemnitz.     

Influence of Rewetting Behavior on the Distortion of Bearing Races

Immersion quenching in evaporable fluids like oil, polymer solutions, or water is a widely used technique in heat treatment shops because this technique provides higher heat transfer coefficients than the most alternative gas quenching techniques. The disadvantages of immersion quenching in evaporating fluids are the complex heat transfer mechanisms which consist of the three phases, film boiling, nucleate boiling, and convection. Especially the transition from film to nucleate boiling—the rewetting of the sample surface—is a complex process which leads to a strong position dependence of the heat transfer coefficient of the cooled work pieces. In particular, immersion quenching of thin-walled rings can result in large changes of ovality with comparable high scattering. To understand these results, two series of experiments were performed. Rings were quenched in oil in a special quenching tank and the rewetting behavior was documented. Furthermore, bearing races were quenched in a standard tank. Before and after heat treatment, these rings were measured by a coordinate measuring system and the distortion was determined. The investigations have clearly shown that the vapor film can have an important influence on distortion generation during oil quenching. The resulting distortion can principally be explained by the observed rewetting behavior.     

基于ADAMS弹性浮动研磨机的动力学仿真

基于金刚石弹性浮动研磨的原理,运用Pro／E软件完成弹性研磨机的三维实体建模,并将该模型导人到多体动力学分析软件ADAMS中,利用它白带的AUTOFLEX模块将弹性梁、弹性垫转化为柔性体的模态中性文件,从而得到刚柔混合模型。仿真分析结果表明．丁件的跳动量将直接影响金刚石表面研磨质量,分析了弹性梁的长度、研磨压力及研磨盘的不平整度对工件跳动量的动力学分析。     

基于光学鼠标传感器的中远距离微位移测量装置的设计

在单晶金刚石弹性研磨过程中,测量研磨盘浮动的涡流传感器与盘面的距离较小,不利于研磨盘的调整。为了提高测量距离,提出了一种基于光学鼠标传感器ADNS3080的中远距离的微位移测量方法,分析了测量原理,对测量系统的光路、显示窗口、数据的存储、测量软件部分进行了设计。并通过试验证明该方法能实现中远距离微位移的测量。     

Impact of “ultra low emission” technology of coal-fired power on PM2.5 pollution in the Jing-Jin-Ji Region

In response to severe haze pollution, the Chinese government has announced a series of policies focusing on controlling emissions from coal consumption. “Ultra-low emission” (ULE) technologies have the potential to dramatically reduce emissions from coal-fired power plants, and have been deployed at some facilities in recent years. This paper estimated the potential environmental benefits of the widespread adoption of ULE in the Jing-Jin-Ji Region. Atmospheric modeling scenarios were analyzed for three cases: a “standard” scenario assuming no ULE deployment, a “best case” scenario assuming complete adoption of ULE across all power plants in the region, and a “natural gas” scenario, assuming emissions factors consistent with natural gas-fired power generation. The simulations show that the widespread adoption of ULE technologies can be an effective and economically competitive option for reducing the impacts of coal-fired power generation on air quality.     

微型打印机打印技术分析

目前关于微型打印机应用的文献主要关注打印机与单片机系统的连接方法以及打印驱动程序设计。文中以RD系列针式打印机为例,给出了打印机与C8051单片机的连接及驱动程序,介绍了汉字打印技术、各类打印格式设置方法以及图形打印技术,给出了打印程序实例。     

Reaction of visual cortex neurons to cross-like figures during local inhibition blockade

Incidental finding of a primary malignant lymphoma of the ovary in a 20-year-old patient is presented. Two and a half years following ablative surgery and adjuvant chemotherapy, the patient is alive and disease free. Ovarian lymphoma is a disease of reportedly poor prognosis. However, many previously reported cases of ovarian lymphoma actually represented ovarian involvement by a more diffuse lymphomatous process. If stringent criteria are used for case selection, true primary ovarian lymphoma usually carries a favorable prognosis.     

Visual localization in dyslexia.

Individuals with specific reading disability (SRD) may exhibit visual psychophysical abnormalities that include prolonged visual persistence, decreased luminance contrast sensitivity, lower flicker fusion thresholds, abnormal metacontrast masking, and lower motion detection sensitivity. These abnormalities could result from impairment of the magnocellular division of the visual afferent pathway to the cortex. The authors predicted that an impairment of this pathway would also cause abnormalities in ability to localize visual stimuli. This prediction was tested in 2 experiments. Results of both experiments showed that adults who reported a history of SRD and who currently had lower reading performance were less able than non-SRD participants to report the locations of small visual stimuli that were briefly flashed at positions similar to the ends of lines of text. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The use of implant-supported titanium prostheses for treatment of periodontally compromised patients including functional and orthodontic therapy. Report of 2 cases

Due to its corrosion resistance and biocompatibility, titanium appears to be an alternative material for implant-supported restorations. However, due to technological difficulties, the clinical application of titanium in implant restorations has been limited. Only after recent progress in technology could the clinical use of ceramo-metal titanium restorations be recommended. The therapeutic repertoire for treating patients with missing teeth has been significantly expanded by modern implant methods. Osseointegrated prostheses have become an integral part of restorative therapy also for periodontally compromised dentitions. This article presents 2 case reports for the use of ceramo-metal implant-supported titanium cast prostheses for restorative treatment of periodontally compromised patients requiring comprehensive treatment involving periodontal, functional, orthodontic and prosthodontic therapy. Favourable clinical results have been obtained and a complication-free service of these reconstructions has been documented throughout a 12- to 24-month observation period. These observations suggest that implant-supported ceramo-metal titanium prostheses may be a valuable part of restorative therapy for periodontally compromised dentitions in that they facilitate restorations with optimal biocompatibility. However, controlled clinical studies are needed to establish the long-term serviceability of these titanium restorations.     

Serotonin transporter gene-linked polymorphic region: allele distributions in relationship to body weight and in anorexia nervosa

Several lines of evidence implicate a role for the serotonergic system in body weight regulation and eating disorders. The magnitude and duration of postsynaptic responses to serotonin (5-HT) is directed by the transport into and release from the presynaptic neuron. Recently, a common polymorphism of a repetitive element in the region of the serotonin transporter (5-HTT) gene-linked polymorphic region (5-HTTLPR) was identified that results in a system of two common alleles. The activity of the 5-HTT, as measured in in vitro assays and in human lymphoblastoid cell lines, is dependent on the respective genotype. We thus hypothesized that this polymorphism is relevant for weight regulation in general and is possibly involved in the etiology of anorexia nervosa (AN). Allele frequencies and genotypes were determined in a total of 385 unrelated obese children, adolescents and adults, 112 underweight subjects and 96 patients with AN. Furthermore, both parents of 98 obese children and adolescents and of 55 patients with AN, respectively, were genotyped, thus allowing to test for both association and linkage. The comparison of allele frequencies between obese and underweight probands provided no evidence for a major role of the 5-HTTLPR in weight regulation. Patients with AN had allele frequencies not significantly different to those observed for obese and underweight individuals.