不常发生

Literature Research The etiological factors of POF are not still clear. The changes of sites and numbers in X chromatosome, X; autosome translocations, a forkhead transcription factor gene (FOXL2) mutations, FRAXA premutations and inhibits gene mutations are found in POF patients, so genetic disorders have been thought to be involved. Irradiation, chemotherapy or pelvic operations can damage ovaries and cause ovarian atrophy and failure, so it is thought one factor of POF.

一、文献研究 POF的确切病因目前尚不清楚，从POF患者体内检测到X染色体上位点和数目的变化，X染色体与常染色体间的平衡易位，脆性X基因前突变，FOXL2基因突变，抑制素基因突变等，故认为POF发生与遗传因素有关；由于放射、化疗或盆腔手术等可损伤卵巢，导致卵巢萎缩，出现卵巢衰竭，故也是导致POF的因素之一。

Angular cheilitis malnutrition and nutritional deficiencies in vitamin B family, or zinc deficiency often occur in persons to a lack of vitamin B group the most common cause of angular cheilitis.

营养不良性口角炎在营养缺乏和维生素B族或锌缺乏者中常有发生，以维生素B族缺乏引起的口角炎最常见。

Based on the equilibrium equation of an arch element the cubic nonlinear dynamic model with second order is established and the nonlinear differential dynamic system without constant term is obtained through a transfer process of T=U+b. Hence three fixed points and the homoclinic orbits are found. The critical condition of the chaotic vibration of the elastic arch is given by using the method of Melnikov function. The numerical results of the stationary and chaotic motion are given and discussed.

首先利用拱的单元平衡方程建立了拱的二阶三次非线性动力学模型；然后通过变换使方程转化为不含常数项的非线性微分动力系统，并由此得到无扰动系统的3个不动点与同宿轨道；再用Melnikov函数法给出了发生混沌的临界条件；最后给出了该系统出现定常运动和混沌运动的数值结果。

Eight or nine years after the events narrated in the second part of this story, people noticed on the Boulevard du Temple, and in the regions of the Chateau-d'Eau, a little boy eleven or twelve years of age, who would have realized with tolerable accuracy that ideal of the gamin sketched out above, if, with the laugh of his age on his lips, he had not had a heart absolutely sombre and empty.

在本故事第二部分谈到的那些事发生后的八年或九年左右，人们在大庙路和水塔一带，时常看见一个十一二岁的男孩，嘴边带着他那样年纪所常有的笑容，心里却是绝对的苦闷和空虚，如果不是那样，他便相当正确地体现了我们在前面勾画过的那种野孩的形象了。

The people that I'm talking to that I worked with, I worked with on the side of just being regular Petty Officer McCollum in the Coast Guard, so they are not fully aware, but they have contacted me and said: Aaron, something weird is going on, and I can't quite place it, and they've never seen anything like it

跟我一起工作的这个人，我常跟他工作，仅仅是站在在海岸警卫队的海军**士**官麦科勒姆的位置上，所以他们也不完全清楚，但他们已经与我联系并说：'亚伦，一些奇怪的事情在发生，我不能把它搞清楚'，他们从来没有见过我所说的那样的事情

The people that I'm talking to that I worked with, I worked with on the side of just being regular Petty Officer McCollum in the Coast Guard, so they are not fully aware, but they have contacted me and said: Aaron, something weird is going on, and I can't quite place it, and they've never seen anything like it.

跟我一起工作的这个人，我常跟他工作，仅仅是站在在海岸警卫队的海军士官麦科勒姆的位置上，所以他们也不完全清楚，但他们已经与我联系并说："亚伦，一些奇怪的事情在发生，我不能把它搞清楚"。

BPH is a common disease in old people, it often causes bladder outlet obstruction and destrusor instability. It is reported that the morbidity, rate of detrusor instability secondary to BPH is from 52% to 80%. There are many hypotheses concerning detrusor instability, The study of detrusor denervational hypersensitivity and changes of detrusor ultra-structure are intensively popular at present. But most of the research work were only limited in animals. In order to gain the insight into its mechanism, we Carried out a series of studies on detrusor instability secondary to BPH obstruction in men.

BPH是老年人常见疾病，常导致膀胱出口梗阻和逼尿肌不稳定，有报道BPH梗阻性逼尿肌不稳定的发生率为52-80％，引起逼尿肌不稳定原因很多，其中逼尿肌去神经超敏和超微结构的变化是目前研究的热点，但大多限于动物实验，鉴于此，我们对BPH梗阻性逼尿肌不稳定进行了初步的研究，拟探讨其发生机制。

If eating unclean food or food spoilage caused diarrhea, which is often said that the "infantile enteritis" or bacillary dysentery.

一是饮食不洁：如吃了不干净的食物或腐败变质食物而发生腹泻，这是人们常说的&小儿肠炎&或细菌性痢疾。

The research contents and main conclusions are as follows:1. The present thesis adopted one-dimension interior ballistic model, regarding the ballistic spatial core as the unsteady quasi one-dimension airflow containing the friction and heat exchange between airflow and tube wall, considering the boundary layer unsteady, nonstationary condensable current; and employed the MacCormack finite difference method to write the program.

本文的研究内容及结论主要体现在以下几个方面： 1、采用了一维内弹道模型，把弹后空间的核心流部分考虑为包含气流与身管管壁发生摩擦和热交换的不稳定准一维流，边界层考虑为不稳定、非定常可压缩流，用MacCormack有限差分方法求解，编制程序进行计算，较为准确的得到了复合材料身管固壁瞬态温度场分析内边界条件所需的气流温度和对流换热系数结果。

Chromatic plastic film and light conversion film has been applied in protected cultivation, and plastic films with different light quality may serve as a non-chemical approach regulating growth and thermoperiodic responses of plants. A few studies showed that light quality affected growth and yield of strawberry, but little is known about its effects on photosynthesis and chlorophyll fluorescence in strawberry leaves, and fruit quality. So it is beneficial to scientific regulating growth and fruiting for strawberry protected cultivation to study on those effects and the interactions between CO2 and N supply on photosynthesis.

而低氮影响植株生长、叶片黄化，进而影响光合作用，导致抗性减弱和产量品质下降；③CO_2供应问题：目前我国草莓栽培常在设施环境下进行，在封闭性强的设施中空气流通不畅，常导致设施内部CO_2供应不足而影响光合作用，进而影响产量和品质；④光不足与光质问题：设施栽培中，光通过玻璃和塑料棚膜后使设施内的光强与光质均发生改变，这些变化特别是光质变化对草莓生长与结果的影响程度尚无明确认识。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。