粗轧带坯宽向温度分布的仿真

基于以往对固体热交换问题的研究,提出了一种新的适合于粗轧带坯宽向温度分布的仿真方法,并对热交换系数的优化提出有效的经验值估计区间法。仿真实验结果表明：新的仿真方法改善了仿真数学模型的形式,并且利用经验值估计区间的参数优化法大大地提高了运算效率。     

复合泊松分布参数估计的EM算法

复合泊松分布是非寿险精算中的重要理赔模型,利用正规的统计方法(如极大似然估计)估计模型的参数往往比较困难,而矩估计的精度在大样本下才能有令人满意的结果.本文应用EM算法研究了复合泊松分布的参数估计问题,给出了参数满足的方程,并给出了参数的矩估结果,对两种参数估计结果,通过计算机模拟,表明EM算法对参数的估计更为有效,且EM算法在小样本下就能得到较好的估计效果.     

混合时变时滞神经网络的状态估计器设计

研究了混合时变时滞(离散时滞和分布时滞)神经网络的状态估计问题.离散时滞在一个区间上变化,区间下界不一定为零.通过构造一个新的Lyapunov泛函,结合Jensen积分不等式,可以得到一个时滞相关状态估计器设计方法,使得误差系统是全局渐近稳定的,所得结果由线性矩阵不等式形式给出.数值算例证明了本文方法的有效性和优越性.      

双重指数函数的幂级数可展性

考察一个函数在给定区间上是否可展为麦克劳林级数,一般是判断余项在该区间上是否趋于0.利用该方法,通过建立一个级数估计式,给出双重指数函数y=eex在实数域上的可展性证明.     

探讨回归系数的stein型主成分估计问题

设计阵X呈病态的线性回归模型，给出一种新的关于回归系数的有偏估计，即stein型主成分估计，且对偏参数的存在性。最优性进行了一些探讨。     

热连轧窄带钢自适应控制在线确定增益系数的研究

对热连思窄带钢热轧制过程中自适应增益系数α的确定进行探讨，以４５０ｍｍ热连轧机为仿真对象，分析各种影响α的因素，胜数理统计中未知方差σ＾２的参数区间估计方法确定实测数据的置信概率，用参数寻优法建立了α和实测数据置信概率之间的定量关系，为在线确定α值提供了依据。     

一类区间非线性规划不确定性问题的转化

本文在对区间参数运算关系阐述的基础之上对仅目标函数含有区间参数的非线性规划模型及算法进行了研究,将区间非线性规划的不确定性问题转化为三个目标规划问题.     

区间参数智能梁结构闭环系统动态特性分析

以区间参数压电智能梁结构为研究对象,建立了基于位移反馈控制结构闭环系统动态特性分析的有限元模型.在材料物理参数和几何尺寸等为区间变量时,分析了结构质量矩阵和刚度矩阵的不确定性.并从求解结构振动动态特性的Rayleigh商出发,利用区间变量运算法则推导出了结构闭环系统固有频率的数字特征表达式.通过算例,考察了区间参数对结构固有频率特性的影响,并验证了所建模型和方法的可行性与合理性.研究结果表明,利用区间系数分析法来研究压电智能梁结构闭环系统的动态特性具有一定的工程应用价值.     

沪锌:区间震荡 防范风险

自2010年8月以来,LME三月锌在2000-2600美元/吨区间运行已有1年时间,2011年8月初,锌价又回到一年前的起点。价格下跌使沪锌风险快速释放,短期继续大幅下跌动能不足。中国经济增速减缓但稳定,锌的需求没有急剧恶化,估计未来两月需求回升将支撑沪锌收复部分失地。我们维持沪锌震荡观点。因欧美经济复苏乏力,运行区间有所下调。未来两个月锌主要区间16500-18000元/吨,LME三月锌区间2050-2400美元/吨。虽然我们估计沪锌区间震荡的可能性较高,并     

卷取机助卷辊电液伺服系统传递函数辨识

首先利用正弦波的方法测试卷取机助卷辊电液伺服系统的频率特性，然后利用Levy法估计出系统的开环传递函数，并且给出该系统频率特性的相关参数。现场试验表明该方法简单有效。     

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。     

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.     

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。     

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.     

Quality of life of relatives of mental patients

Usage of quality of life of psychiatric patients' relatives as the parameter of estimation of the quality of psychiatric care is considered. By means of standard questionnaire elaborated by the authors as well as by means of both individual and group conversations the quality of life was analyzed in 40 relatives which lived together with psychiatric patients. Different spheres of their life and difficulties (financial, social-psychologic, production) were examined in families with such patients. The defects of psychiatric care that had direct influence on the quality of life of the psychiatric patients' relatives are outlined.     

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)