思茅松人工幼龄林和中龄林直径分布规律的研究

以40块思茅松幼、中龄人工林样地资料为依据,利用正态分布和Weibull分布密度函数对林分的直径分布进行拟合.卡方检验表明,正态分布的适合率为95.0%,Weibull分布的适合率为97.5%;Weibull分布、正态分布都可以用来描述思茅松幼、中龄林林分直径分布.林木竞争、分化激烈的林分,用Weibull分布来描述其林分直径分布较正态分布适合;而竞争、分化不太剧烈的林分,尤其是自疏开始前的幼龄林,用正态分布来描述其林分直径分布较Weibull分布适合.     

高炉煤气分布的在线模型

高炉煤气分布的在线模型［芬兰］ＭａｔｓＮｉｋｕｓＨｅｎｒｉｋＳａｘｅｎ１前言高炉煤气径向分布是个重要的变量，它不仅影响炉身的热量及质量传输，也影响炉衬寿命。矿石和焦炭的径向分布对料床的透气性影响很大，可通过控制炉料的分布来控制气流分布。由于高炉内部的...     

高炉径向煤气流分布模型

介绍了一个在线的评价高炉径向煤气流分布的模型，该模型是在炉喉区的摩尔和能量流平衡的基础上，并依靠煤顶煤气温度和由固定在料面上探针测量的煤气温度建立起来的，而煤气通量的分布则是卡尔曼滤波器来评价。该方法证明可以得到芬兰高炉煤气流分布的短期动力学并可探测出突然的重大变化。     

无缝钢管张减过程张力对壁厚分布的影响

通过对典型规格张减过程的分析，研究了张力对壁厚分布的影响，并进行了试验研究和有限元模拟，通过对比验证了可靠性，基于机架伸长率计算了增厚段切除长度，为掌握张力和钢管壁厚分布之间的关系，实现预定壁厚钢管的生产提供了依据。     

关于铅锌原矿Pb、Zn品位分布状况的研究

铅锌矿所采出原矿的Pb、Zn品位在出矿随机取样分析时所得到的检测结果的统计分布状况同时也反映了矿产资源在一定的地质条件下所生成的地质原矿金属品位的分布.根据统计资料对原矿的Pb、Zn品位分布状况进行研究,目的就是找出其分布规律,以建立其分布的概率密度函数,结合探矿时矿体的资料科学地计算出原矿Pb、Zn品位分布区间的概率.以便更准确地推断矿产资料储有量.     

荆门市常见传染病季节性分布特征动态分析

目的 分析荆门市常见传染病发病的季节性分布特征与流行规律,为制定和调整传染病的防制策略和措施提供科学依据.方法 采用集中度和圆形分布法进行季节性分析,按照控制图法预警模型原理,对2000-2009年的分月发病情况进行评价.结果 荆门市常见传染病中乙型脑炎有严格的季节性,麻疹、疟疾有明显的季节性,痢疾、伤寒有一定的季节性,甲型病毒性肝炎、肺结核、乙型病毒性肝炎、淋病季节性较差;麻疹、疟疾、痢疾的季节性呈逐年降低下降趋势,发病高峰日呈逐年提前趋势;麻疹、梅毒的发病态势不稳定.结论 针对不同传染病的季节性分布特征需采取不同的控制措施.     

高炉炉顶径向气体分布

高炉的操作主要依靠对炉料和气体分布进行良好的控制。对许多高炉来讲这种控制依赖于料面以上的固定取样器的测量数据。因此，准确了解料线和料面以上固定取样器之间的气流就变得非常重要。应用在高炉炉顶测量的数据并使用数学模型进行计算，结果表明，复杂的气流导致了在料面高度和料面以上取样器高度之间数据的差异。在高炉中心区域的气体因温度较高而产生了加速度。因此位于边缘气体向中心流动。料面的倾斜几乎没有任何影响。因此     

竖炉内颗粒、空隙率及气流分布模拟

为研究布料操作对竖炉内颗粒、空隙率及气流分布的影响,基于离散单元法(DEM)建立挡板布料器三维模型,分别计算分析不同挡板角度和料线高度下颗粒分布及空隙率分布,并评估其对气流分布的影响。结果表明,颗粒分布情况无法直接反应空隙率分布。当挡板角度为80°时,空隙率分布最均匀。料线高度对空隙率及颗粒分布的影响小于挡板角度的影响,随着料线高度增加,空隙率更均匀,但颗粒分布变化很小。当挡板角度为75°和80°时,有利于控制心部气流,而当挡板角度为82.5°和85°时,有助防止边部气流过度发展。适当增大料线高度,可使气流分布更均匀。     

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.     

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)