一类分数阶微分方程三点边值问题的多重正解

主要研究了一类Riemann-Liouville分数阶微分方程三点边值问题多重正解的存在性,通过格林函数的正性和上下解方法建立了边值问题{Da0+y(t)+f(t,y(t))=0,0＜t＜1;y(O)=0,y(1)=βy(η) 的单一正解的存在性,应用Leray-Schauder非线性抉择定理和Guo-Krasnosel'skii不动点定理得到了该边值问题的多重正解的存在性.     

二阶周期边值问题正解的存在性

利用锥不动点定理研究了一类二阶非线性周期边值问题正解的存在性.     

一类非线性波动方程局部解的存在性

通过对一类具非线性阻尼项的波动方程的初边值问题的研究,在非线性阻尼项及源项的指数不加限制的情况下,应用压缩映射原理,结合内插定理和嵌入定理,证明了该问题局部广义解的存在性和唯一性.     

一类二阶奇异微分方程边值问题正解的存在性

研究一类二阶奇异微分方程(p(i)u'(t))'=q(t)f(u(t)),其中,f∈C(R+,R)有界.在满足边值条件u'(0)=0,u(M)=0下,应用临界点理论并结合分析的方法,证明了上述边值问题至少存在一个严格递减的正解.该结果推广了现有文献中的相关结论.     

一类非主型方程定解问题的离散现象

应用奇型偏微分方程理论，对一类非主型的椭圆型方程的求解进行了讨论，并对此类方程的Ｄｉｒｉｃｈｌｅｔ问题和Ｎｅｕｍａｎｎ问题的解的存在性中的离散现象进行了初步的分析．     

分数阶微分方程反周期边值问题解的存在性

分数阶微分方程边值问题具有良好的理论价值和广泛的应用背景,一直吸引不少学者对其进行研究.反周期边值问题是边值问题中重要的一类.作者利用Krasnoselskii不动点定理和一些分析技巧,研究一类分数阶微分积分方程反周期边值问题,获得了反周期边值问题解存在的一个充分条件.与以往的结果相比较,论文中所得的条件容易验证,在一定程度上推广了已有的结论.     

一类高阶多点边值问题在共振条件下的可解性

考虑非线性高阶多点边值问题解的存在性,这里f:[0,1]×Rn→R是连续函数,e(t)∈L1[0,1],βj(j=1,2,…,m-2)为符号不全相同的实数,0<η1<η2<…<ηm-2<1.利用Mawhin连续性定理对于上述共振条件下的非线性n阶多点边值问题建立了解的存在性结果.     

一类三阶拟线性方程组的奇摄动边值问题

本文用间接的方法证明了一类三阶拟线性方程组的奇摄动边值问题解的存在唯一性,并给出了解对小参数任意精确度的一致有效展开。     

非线性矩阵方程X-A*((X)-C)-n A=Q的正定解

研究了非线性矩阵方程X-A*((X)-C)-n A=Q的正定解,证明了该方程一定存在正定解,并给出了正定解的存在区间、存在唯一正定解的条件以及迭代求解方法.     

椭圆调径挡板文氏管调节特性曲线方程的推导

本文采用数学方法,建立了挡板为椭圆型的文氏管喉口通流面积和挡板开度的普遍关系式,推导严密,方式简单,并通过实例证明了它的正确性。     

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)     

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.