ANALYSIS OF DRIVING FORCES ON THE CHANGE OF HISTORICAL FARMLAND USE IN SHANDONG PROVINCE DURING THE QING DYNASTY (1644-1911)

National Natural Science Foundation of China [40201005]; Knowledge Innovation Project of Chinese Academy of Sciences [KZCX3-SW-321, KZCX2-314, KZCX1-SW-321-4]

规则波作用下张力腿平台的非线性动力响应

建立了一种考虑多种非线性因素的张力腿平台（TLP）模型，其中包括六自由度有限位移、各自由度之间的耦合、瞬时湿表面、瞬时位置、自由表面效应、粘性力等因素引起的非线性。推导出TLP六自由度非线性运动方程。对典型平台ISSCTLP进行了时域上的数值计算，求得该平台在规则波作用下的六自由度运动响应。用退化到线性范围的解与已有解进行了对比，吻合良好。数值结果表明，综合考虑非线性因素后响应有明显改变。

空间科学展望

<正> 一、空间科学 空间科学研究行星系统、恒星系统、星系、宇宙、以及生命物质等宇宙空间客体的结构和演化;以及在地球外空间进行生理学、生物学及微重力科学等精心设计的实验和研究。前者是在外层空间进行观测和测量,后者是将地面实验室的研究延伸到外层空间。当本世纪五十年代人造地球卫星被成功地发射到地外空间以后,人类的科学视野就极大地拓展了,人们可以直接地测量地球空间和行星

Multibeam coupling in photorefractive SBN:Ce

Theoretical and experimental results are presented for simultaneous multibeam coupling in photorefractive SBN:Ce. Within a single crystal, multiple signals are amplified through a coupling process that employs a single pump. The coupling gain of each signal results from coupling both between the pump and the signal and between different signals. The amount of gain that each signal receives is dependent on the intensity of the incident signal; thus a competition for the gain exists among the various signals.

THE POSSIBLE INVOLVEMENT OF TISSUE-TYPE PLASMINOGEN-ACTIVATOR IN LUTEOLYSIS OF RHESUS-MONKEY

Changes of plasminogen activators (PA) during different stages of development of the corpus luteum, and their possible physiological role in luteolysis were studied in rhesus monkeys. It was demonstrated for the first time that monkey corpus luteal cells not only produce PA, but that the function of the corpus luteum is also closely related to the activity of this enzyme system. Generally, the life span for a corpus luteum in monkey is approximately 14-16 days, its demise beginning thereafter. In the present study, we found that urokinase in the corpus luteum is higher on day 5 and day 10 after human chorionic gonadotrophin injection, while the tissue type (t) PA is mainly produced on day 13 when luteolysis may take place. Progesterone production remained high on day 5 and day 10 and decreased dramatically from day 13, indicating the important role of tPA but not urokinase (u) PA in suppressing luteal function. When purified tPA (but not uPA) monoclonal antibody was added to luteal cell culture to neutralize endogenously produced tPA activity, progesterone production in the cells was increased significantly. Interestingly, prolactin alone was capable of increasing PA production by luteal cells; prolactin together with luteinizing hormone, however, had a synergistic luteotrophic effect.

原管藻及其出芽在系统学上的意义

在湖北武汉市天兴洲江滩边采到一种红色的藻类 ,经鉴定为原管藻 (Protosiphonbotryoides (Kuetzing)Klebs) ,原管藻属是单种属 ,中国新记录。通过野外观察和室内培养 ,对其形态学和繁殖方式进行了研究。其红色多核胞囊在水淹时能迅速产生大量游泳细胞 ,直接萌发成球形幼体或相互结合成星形或不规则分叶的合子。幼细胞球形 ,向两端生长 ,上部为绿色球形 ,下部是长而无色的假根 ;上部绿色球形部分可以以出芽方式形成新个体 ,新细胞和母体大小接近 ,这点和以往文献报道的稍有不同。成熟的

高质量二维光子晶体结构刻蚀掩膜版的制作方法

结合制作光子晶体结构的具体要求,研究了电子束曝光得到的电子束胶上(GaAs衬底)随实验条件变化的图形.结果表明,胶的厚度、曝光剂量、显影/定影时间等参数对图形的质量有重要影响.通过合理优化这些参数,我们得到了高质量的掩膜图形.