蜂巢式金属扩展表面强化换热插件的开发

从强化热交换设备气体侧的换热能力出发,针对传统换热插件的不足,开发了一种新型金属材质的强化换热插件——蜂巢式扩展表面.该插件一方面具有制作加工灵活、更换方便、弹性优良、气流阻力损失小等特点,可强化自身的导热及其与换热间壁的接触换热；另一方面由于具有很高的比表面积,且可同时起强化气体侧对流和辐射换热的作用,其又是一种综合性能高的扩展表面.工业应用表明,嵌入金属蜂巢后热交换设备的强化换热效果明显.     

攀钢煤化工公司工业水系统优化及技术改造

介绍了攀钢煤化工公司工业水系统现状，对水质、换热设备及运行中存在的问题进行了分析。通过采取增设旁滤池、循环水加药处理和优化运行方式等措施，降低了工业水消耗，改善了工业水、循环水水质。     

对方框型空冷式换热器的再认识和创新

对水系统换热设备一空冷式换热器工作机理进行了分析和描述,同时结合马钢水系统换热冷却设备实际使用情况进行总结,针对换热设备存在不足提出了改进和创新设想,旨在推进空冷式换热器的发展更趋完善和成熟。     

基于气侧强化换热技术的间壁式气体-散料换热器

目前工业中气体-散料多为直接换热,这种换热方式对易与换热介质发生不良反应、粒度较细的散料不适用,因此着眼于气体-散料的间接换热,首先研制了一种气体侧强化换热插件——金属纤维多孔体,并采用FLUENT软件对其传热与流动特性进行研究,然后开发了间壁式气体-散料换热器,其换热高效、结构紧凑,已在工业上成功应用。     

空分设备换热器设计及温差选取

介绍了一般空分设备换热系统的设计软件环境,同时对空分设备的换热阻力设计,对气体、液体以及气液混合物的换热及换热器温差选取进行了详尽的阐述。随着空分行业的蓬勃发展,研究并合理地分析应用空分换热系统对提升行业设计能力有重大意义。     

汽轮机凝汽器换热异常的分析及处理措施

凝气式汽轮机的凝汽设备起着冷源的作用,其主要任务是将汽轮机排汽凝结成水并在汽轮机排汽口建立与维持一定的真空度,凝汽器设备换热的好坏,对汽轮机装置的真空度、效率、功率有重大影响,直接影响到整个汽轮机组的热经济性。文章对汽轮机凝汽器端差、循环水温升和凝汽器入口、出口水温等影响凝汽器换热效果的因素进行了分析,提出了换热问题的处理方法、本机组凝汽器异常的处理方法和日常维护的注意事项。     

高炉风口换热过程数值模拟

高炉风口是高炉输送高温鼓风和煤粉必需的冷却设备。以外观尺寸相同的空腔式风口和贯流式风口为研究对象,运用数值模拟分析软件Fluent,采用k-epsilon双方程模型,压力基求解方法,对两者的换热过程进行模拟并对照分析了入口流速对其换热性能的影响。结果表明:随着水流量增加,风口表面温度下降,但进出口压损增加;相同水流量情况下,贯流式风口比空腔式风口换热能力更强,但产生的压损更大。综合考虑,2种模型的进水流速均以5～10m/s为宜。     

氧化铝生产中传热系数的研究

大多数氧化铝生产工序的能耗与换热设备传热效率的高低有密切关系。分析了氧化铝生产过程中的传热和传质特征。结合生产实测数据,对氧化铝生产中典型换热设备的传热系数进行研究,为设计、生产提供了理论基础。     

19.05mm强化管管外冷凝换热的试验研究

随着能源短缺问题的日益突出,节能环保受到人们的重视.工业上使用的换热设备,其性能的优化也受到各行业的重视.建立一套集沸腾和冷凝于一体的水平单管管外凝结换热试验装置,针对直径19.05 mm的强化管,对不同制冷剂管外凝结换热进行试验研究.通过试验分析可知:不同水流量,强化管的总体传热系数随着管入口冷却水温的上升而逐渐升高;在一定的冷却水温度下,强化管的总传热系数随着冷却水流量的增大而逐渐升高;相同工况下,R410A传热系数比R134a高出约1.28%~3.39%;凝结换热饱和温度越高,凝结传热系数越小.     

焦化厂循环冷却水处理

焦化厂循环冷却水的闭路循环,但系统中的管道及换热设备产生腐蚀和结垢,影响生产和设备使用寿命,通过控制循环冷却水系统的微生物生长、控制结垢和腐蚀速度来达到延长管道和设备的使用寿命的水质处理技术,从而使换热设备长期高效运行。     

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。     

焦炭热性能指标意义浅析

通过对焦炭在高炉内的历程及其变化规律的剖析,阐述焦炭热性能指标的意义,形象地把焦炭在高炉内的损耗分为三部分(M1,M2,M3)。指出M2对焦比及焦炭价格有一定的指导作用。     

Results of treatment of cancer of the cardia

Cancer of the cardia is traditionally discussed with cardiac cancer of the lower portion of the esophagus and upper gastric cancer invading the esophagus, and the specific characteristics of cancer of the cardia have never been clearly defined. We reviewed the outcome of 172 patients with adenocarcinoma of the cardia who had undergone radical surgery between 1949 and 1994 in the Division of Gastrointestinal Surgery of the Cancer Institute Hospital. The centers of the tumors were located within 2 cm above and below the boundary between the esophagus and the stomach, and their longitudinal diameter was less than 8 cm. We divided the patients into an early period (1949-1979; n = 79) and a late period (1980-1994; n = 93), and focused on the historical transition. There were no differences in patient gender or histology between the two periods. However, the late period was associated with fewer cases of esophageal invasion and shorter longitudinal diameter, as the age of the population advanced. The number of advanced cancers such as the localized and infiltrative type had decreased, and early cancer and early clinical stage had become more common, but despite the fact that the number of early cancers had increased, extended dissection, such as thoracic and paraaortic lymph node dissection, was performed more frequently. By clinical stage, the long-term outcome markedly improved in Stage I patient in the late period, and tended to improve in Stage II and III patients. This appears to have been attributable to the prevention of micrometastasis by extended dissection, although the number of early cancers is another major potential cause. There were no differences in the outcome of Stage IV patients between the two periods, and further advances in multimodality therapy must be awaited. The range of resection is basically proximal gastrectomy, and if there are adequate indications, the prognosis is favorable. In view of the status of lymphatic flow and lymph node metastasis, and long-term results, lateroaortic lymph node dissection is important. Since the number of early cancer patients has been increasing, if intraabdominal recurrence is prevented, intrathoracic lymph node dissection will contribute greatly to the outcome of such patients.     

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。     

Effect of antibiotics of chemotaxis of human leukocytes

The effect of 20 different antibiotics on chemotaxis by human neutrophils was studied. Human leukocytes incubated with chloramphenicol, rifampin, sodium fusidate, and tetracyclines in vitro showed markedly depressed migration. The mechanisms by which these antibiotics affect leukotaxis are discussed.