周期脉冲撞击的两分量Bose-Einstein凝聚系统的单粒子相干和对纠缠     

严冬  宋立军 《海洋学报》2010,32(10):6832-6836

在周期脉冲撞击的两分量Bose-Einstein凝聚系统中,研究了量子混沌对单粒子相干和对纠缠性质的影响.研究表明,混沌促使单粒子相干发生强烈衰减并保持着较低的相干度,同时对纠缠出现最大值并在较短时间后消失.利用单粒子相干的这种性质可以直接测量量子混沌存在的相空间结构,有利于预防Bose-Einstein凝聚的瓦解和控制凝聚体的混沌行为.  相似文献   

Toward an improved global network for determination of tropospheric ozone climatology and trends     

Ronald G. Prinn 《Journal of Atmospheric Chemistry》1988,6(3):281-298

An examination of typical tropospheric ozone variability on daily, monthly, annual and interannual timescales and instrumental precision indicates that the current ozonesonde network is insufficient to detect a trend in tropospheric ozone of 1% per year at the 2 level even at stations with records a decade in length. From a trend prediction analysis we conclude that in order to detect a 1% per year trend in a decade or less it will be necessary to decrease the time between observations from its present value of 3–7 days to 1 day or less. The spatial distribution of the current ozonesonde stations is also inadequate for determining the global climatology of ozone. We present a quantitative theory taking into account photochemistry, surface deposition, and wind climatology to define the effectively sampled region for an observing station which, used in conjunction with the instrumental precision and the above prediction analysis, forms the basis for defining a suitable global network for determining regional and global ozone climatology and trends. At least a doubling of the present number of stations is necessary, and the oceans, most of Asia, Africa, and South America are areas where more stations are most needed. Differential absorption lidar ozone instruments have the potential for far more frequent measurements of ozone vertical profiles and hence potentially more accurate climatology and trend determinations than feasible with ozonesondes but may produce a (fair weather) biased data set above the cloud base. A strategy for cloudy regions in which either each station utilizes both lidars and sondes or each station is in fact a doublet comprised of a near-sea-level lidar and a proximal-mountain-top lidar could serve to minimize this bias.  相似文献   

The Study of Elastic Symmetry and Anisotropy of Elastic Body Waves In Gneiss     

K. S. Aleksandrov  G. T. Prodayvoda 《Geophysical Journal International》1994,119(3):715-728

  相似文献   

浅论高密度电阻率法在工程勘测中的应用效果   总被引：22，自引：2，他引：22  

王文龙  陈天逵 《物探与化探》1995,19(3):229-237

以往在工程地质勘测中,电法勘探主要采用的是电测深法,而电测深法又存在测点密度不大、信息量小等缺点.对于某些探测物来说,存在着资料解释困难的现象.为了解决上述问题,我们引进了一种新方法-高密度电阻率法,经过近几年我们对不同探测物的勘探应用,认为高密度电阻率在工程地质勘察中,是一种简单易行,行之有效的方法.  相似文献   

青藏高原地表净辐射的气候学研究   总被引：7，自引：2，他引：7  

翁笃鸣  高建芸 《南京气象学院学报》1993,16(4):464-470

根据作者提出的地表净辐射各分量的气候学计算方法，计算出青藏高原及其周边地区１７３站的净辐射和其各分量的年，月平均通量密度，并分析其地理分布特征。指出高原主体为总辐射，有效辐射的高值区，地表净辐射场在冬，夏季有较大差异。冬季为一弱正值区，相对低中心呈块状散布在祁连山区等几个地区；夏季因夜雨及地表湿润的缘故，高原大部地区的地表净辐射反有加强。各地净辐射年变化基本形式与总辐射相似。有效辐射年变化一般呈双  相似文献   

长春台磁暴特征研究     

岳庆祥 《东北地震研究》1993,(1)

依据长春地震台记录的磁暴资料,系统总结了第19、20、21三个太阳活动周磁暴特征,并对全球M_s≥7.8级地震的发生与太阳黑子活动、磁暴的关系进行了初步探讨。  相似文献   

青藏高原地区OLR与地面有效辐射关系的分析   总被引：3，自引：0，他引：3  

王可丽  钟强 《高原气象》1991,10(4):380-390

青藏高原;;OLR;;地面有效辐射  相似文献   

The influence of aerosol particle composition on cloud droplet formation     

A. Hallberg  J. A. Ogren  K. J. Noone  K. Okada  J. Heintzenberg  I. B. Svenningsson 《Journal of Atmospheric Chemistry》1994,19(1-2):153-171

A difference in partitioning between cloud droplets and interstitial air for two chemical species (elemental carbon and sulphur) with different expected behaviour in nucleation scavenging was observed in clouds at Mt. Kleiner Feldberg (825 m asl), near Frankfurt, Germany. The fraction of sulphur incorporated in cloud droplets was always higher than the fraction of elemental carbon. This difference in partitioning has also been observed in fog but under different pollution conditions in the Po Valley, Italy. Both these studies were based on bulk samples. In the present study at Kleiner Feldberg, impactor samples of the particles in the interstitial air and the cloud droplet residuals were taken and a single particle analysis was done on the samples. It was found that, for a given particle size, the majority of particles forming cloud droplets were soluble and that insoluble particles preferentially remained in the interstitial air.  相似文献   

中国人类生物气候区划初探   总被引：3，自引：1，他引：3  

张苏平  张文 《气象》1994,20(5):10-15

为研究气温，湿度，风速和太阳辐射对人体冷热感的综合影响，利用有效温度和风冷指数以及我国６５７个气象站３０年的气候资料，做了中国人类生物气候区划。结果表明，我国冬季大致可分为２７个生物气候区，夏季一般可分为２０个生物气候区。区划结果对旅行，定居，城市建设，事行动等人类活动有参考价值。  相似文献   

大气有机污染分析和评价I．采样方法及采样误差     

郎庆勇 《岩矿测试》1994,(3)

对近１０年来国外有关大气污染物的采样方法、有机污染物在气、固相中的分配以及采样误差的主要文献做了简要回顾。对不同采样器的采样效率、误差来源及误差校正方法进行了讨论。列举了一些富有指导意义的研究成果和结论。可以看出，在消除或限制了采样误差后，所得分析结果为客观评价环境污染问题提供了更可靠的依据。  相似文献