自然伽玛曲线上的“海侵针”及其地质意义

自然伽玛曲线上的尖锥状～针状特高异常—“海侵针”,常可指示海侵作用与海相层的存在:“阵发式”海退与“振荡式”海退则是含煤岩系形成过程中两类常见的利于聚煤的海退类型.     

Maternal influences on cardiovascular pathophysiology

Elevated blood pressure (BP) is of special clinical significance because of its association with pathophysiologies such as heart disease, renal failure, and stroke. We described the development of a protocol for use with hypertensive rats in which prepubertal exposure to a high salt (8% NaCl) diet results in a pathophysiological syndrome including rapid increase in BP, failure to maintain normal weight gain, renal damage, cerebrovascular lesions, and early mortality. These phenomena are described for the inbred spontaneously hypertensive rat (SHR), and for reciprocal F₁ hybrids of a cross between SHR and the Dahl salt-sensitive (SS/Jr) inbred strain. The study with reciprocal F₁s revealed striking effects of maternal environment on pathophysiological response to a high salt diet. F₁s nurtured by SHR mothers weighed less at 35 days of age, and after exposure to the high salt diet suffered more rapid BP increases, greater incidence of stroke, body weight loss, and mortality, than F₁s nurtured by SS/Jr dams. These results suggest that maternal mediation of the nutritional status of the animal may play an important role in determining susceptibility to elevated BP and subsequent pathophysiology associated with exposure to a high salt diet. The implication of these findings for human hypertension is briefly discussed.     

次正规条件下0＜P≤1时的鞅Hardy空间

在一般情况下 ,p >1时的鞅不等式及鞅变换不等式在 0 相似文献   

Genetic models in brain and behavior research,part IV

Four reviews on the the role of developmental factors in hypertension are introduced and set in historical context. Recent research in the laboratory rat has shown that the preweaning environment makes an important contribution to the level of blod-pressure reached in adult life in genetic models of hypertension. Both of the most commonly used models of hypertension, the SHR and SS/Jr rat strains, exhibit lower BP in adult life, if they are fostered shortly after birth to mothers from their normotensive control strains. It has been suggested that it is the idiosyncratic maternal behavior of the hypertensive mothers which contributes to the elevated BP of their offspring, and it has been amply demonstrated that there is an association between a constellation of behaviors emitted by rat mothers and the adult BP of their offspring in a wide variety of genetic groups (inbred hypertensive animals, F1's and F2's). In addition to the above, maternal environment has been demonstrated to have a significant impact on the pathophysiological response of hypertensive animals to a high salt diet. Being raised by an SHR mother, versus an SS/Jr mother, increases the magnitude of BP increases to a high salt diet, susceptibility to hemorrhagic stroke, body weight loss and the risk of mortality. A variety of physiological systems are undergoing rapid change during the preweaning period and may mediate the effects of differences in the maternal environment. These include the renin-angiotensin system and the peripheral sympathetic nervous system. Nutritional factors may be involved in all of the phenomena referred to above. Thus, any physiological mechanisms that are proposed to link maternal behavior to its effects on the physiology of adult animals should recognize the involvement of nutritional factors. Research on the role of developmental factors such as maternal behavior in genetic models of hypertension is at the interface of two growing disciplines: behavior genetics and developmental psychobiology. The methodological and conceptual contributions of these fields to advancing our understanding of these phenomena is emphasized.     

从上海史研究看魏斐德治史方法

上海史研究是魏斐德教授后半生最下工夫的领域。上海三部曲、戴笠研究以及一批上海史论文,是他在这个领域里的重要成就。他之所以钟情上海史,是因为研究这个领域有意义、有趣味、有特质、有资料。透过上海史研究成果,可以看出魏斐德后半生的治史方法,这就是＂无法之法,乃为上法＂。具体体现为,史料必求其极度翔实,叙述必求其周密生动,结论必求其圆通牢靠。他研究中国历史,熟悉中国历史,但采取开放的、多视角的态度,不将治史者的价值判断强加给读者,这恰恰是现代或后现代的史学特点。魏斐德是涵化了中西优秀史学传统的、有着当代开放精神的杰出史学家。     

LPQD序列Baum-Katz和Davis大数定律的精确渐近性

设{X_i,i≥1}是一严平稳零均值LPQD随机变量序列,0相似文献   

中微子与X射线天文学的诞生

评述了2002年度诺贝尔物理学奖获得者的成就与贡献，并介绍了有关的物理学背景。     

超凡入圣的变迁--影响R.F.柯尔成才的因素分析

通过对1996年诺贝尔化学奖得主R.F.柯尔(Robert F.Curl Jr,1933-)成长经历的分析,总结出了影响人才成长的几点外部因素.     

试论《马丁·盖尔归来》中的微观史学

20世纪中后期,随着西方微观史学兴起,美国女历史学家娜塔莉·泽蒙·戴维斯以独特的微观史写作手法创作了《马丁·盖尔归来》.她将故事集中在了一个小人物的身上,运用历史学家的微观精神将其放大、扩展,甚至延伸到与整个家庭乃至社会,从而完成了由小见大、由浅入深的全过程.     

非C~2类函数It公式的多维推广

在Jacod研究了一维非C2类函数It 公式的基础上给出了非C2类函数It 公式的多维推广.