心脏机械瓣替换术后抗凝治疗的研究

目的：研究机械瓣替换术后抗凝治疗期间并发症的发生率及分布规律、调整抗凝药的用量。方法：对167例心脏机械瓣替换术的病人进行1～8年的凝血酶原时间随访研究。结果：血栓率0．72％病人·年；出血率9．21％病人·年。血栓集中在非风湿性心脏病及倾斜机械瓣置换者；出血集中在风湿性心脏病及术后心功能不全、肝瘀血者。结论：抗凝治疗期间注意了解病人的心功能、肝功能情况，对不同的人群，采用不同的凝血酶原时间比值，抗凝期间进行中、小手术时采用停服抗凝药三天的方法有较好的效果。     

偶偶核166Hf高自旋态的微观描述

从壳模型组态及核子－核子有效相互作用出发，用一种在截断的态空间中研究偶偶核高自旋态的理论方案，以偶偶核＾１６６Ｈｆ为对象作了计算和讨论。结果表明，该理论方案很好地描述了稀土区偶偶核高自旋态的性质。     

Identification and gene mapping of a narrow and upper-albino leaf mutant in rice (Oryza sativa L.)

The leaf blade consists of color and shape traits. Studies of leaf-blade development are important for improvement of rice yield and quality because it is an essential organ for photosynthesis. A narrow and upper-albino leaf mutant (nul1) was identified from among progeny of the indica restorer line Jinhui10 raised from seeds treated with ethyl methane sulfonate. Under field conditions, the mutant displayed narrow and upper-albino leaf blades with significantly decreased photosynthetic pigment contents throughout their development. The narrow-leaf trait is caused by a decreased number of small veins. In contrast to the wild type, the growth period was extended by approximately 8 d and agronomic traits, such as effective panicle number, percentage seed set and 1000-grain weight, declined significantly in the nul1 mutant. Genetic analysis suggested that the narrow and upper-albino leaf characteristics showed coseparation and were controlled by one recessive gene. The Nul1 gene was mapped onto chromosome 7 between the Indel marker Ind07-1 and the Simple Sequence Repeat marker RM21637. The physical distance between the markers was 75 kb and eight genes were annotated in this region based on the rice Nipponbare genome sequence. These results provide a foundation for cloning and function analysis of Nul1.     

串并联个数和温度对光伏电池结电容的影响研究

研究光伏电池的动态参数对设计光伏发电系统相应后级控制器至关重要.从分析光伏电池物理机理出发,推导出光伏电池单体/模组/阵列的结电容与偏置电压之间的较精确表达式;在提取模型中等效串联电阻和饱和电流的值的基础上,使用LambertW函数推导出偏置电压与输出电压之间的显式表达式;采用工程数学模型结合本征载流子浓度表达式推导了结电容与温度的较精确关系式;分别在不同串并联个数和温度下对结电容的影响做了仿真分析.仿真结果与部分文献的实验结果相吻合,验证了理论的正确性.     

The Absolute and Its Measurement: William Thomson on Temperature

In this paper we give a full account of the work of William Thomson (Lord Kelvin) on absolute temperature, which to this day provides the theoretical underpinnings for the most rigorous measurements of temperature. When Thomson fashioned his concepts of ‘absolute’ temperature, his main concern was to make the definition of temperature independent of the properties of particular thermometric substances (rather than to count temperature from an absolute zero). He tried out a succession of definitions based on the thermodynamics of ideal heat engines; most notably, in 1854 he gave the ratio of two temperatures as the ratio of quantities of heat taken in and given out at those temperatures in a Carnot cycle. But there were difficulties with using such definitions for experimental work, since it was not possible even to approximate an ideal Carnot engine in reality. More generally, it is not trivial to connect an abstract concept with concrete operations in order to make physical measurements possible. In the end, Thomson argued that an ideal gas thermometer would indicate his absolute temperature, and that the deviation of actual gas thermometers from the ideal could be estimated by means of the Joule‐Thomson effect. However, the measurement of the Joule‐Thomson effect itself required measurements of temperature, so there was a problem of circularity.     

Lack of cortisone inhibition of chromosomal puffing inDrosophila melanogaster

Résumé L'administration de cortisone (ou d'hydrocortisone) à des larvesDrosophila n'inhibe pas le bourgeonnement normal des chromosomes de leurs glandes salivaires. Toutefois, la quantité de cortisone que ces larves peuvent tolérer est environ 1/10 de celle qui supprime le bourgeonnement chez les larvesSciara.     

多频率设计的试验解析综合法

本文针对机械系统动态设计的需要,从动力修改原理出发,导出了一种多阶固有频率的动态修改方法。本方法只需给出试验模态分析结果就可以完成所需全部计算。     

基于对应分析的冗余模糊C均值聚类算法研究

针对模糊C均值聚类（FCM）算法聚类原型最适合于球状类型簇的特点,提出了基于类间分离度和类内紧缩度加权的冗余聚类中心的FCM算法,即先将大簇或者延伸形状的簇（非凸）采用加权FCM算法分割成多个小类（冗余类）,从而规避FCM算法对初始聚类中心敏感的弱点．由于隶属度划分矩阵的元素是每个样本隶属于各冗余类的隶属度值,因此将其作为各冗余类的类特征,通过对应分析得到冗余类的新特征,再次采用加权FCM算法进行冗余类合并,最后达到分类效果．以代表曲线分割和曲面分割分类问题的3个典型数据集为算例,结果表明该方法能够识别不规则的簇,解决了FCM算法对初始聚类中心敏感的缺陷．     

高温交联酸用稠化剂合成及性能评价

利用丙烯酰胺(AM)与2-丙烯酰胺基-2-甲基丙磺酸(AMPS)作为原料,进行水溶液聚合,采用低温复合引发体系制备高温交联酸用稠化剂P(AM-co-AMPS),通过单因素分析法确定最佳反应条件;并对其纯化样品进行红外表征,室内性能评价。结果表明,该稠化剂酸溶性好,基液黏度随稠化剂加量增加而增大,配方:20%HCl+0.8%稠化剂+5%BZ酸化缓蚀剂+2%BZ措施用破乳助排剂+2%BZ酸化用铁离子稳定剂+0.3%BZ交联延迟剂。加入交联液(交联剂/交联延迟剂=1,交联比∶100∶0.8),90 s后能形成可挑挂冻胶,180℃,170 s~(-1)剪切速率下,剪切100 min,黏度保持在56 mPa·s左右。加入破胶剂后,在90℃加热1 h,破胶黏度为10 m Pa·s,利于酸液返排,可满足高温储层对交联酸的要求,具有较好的发展前景。