南京城区夏季低层逆温对人体舒适状况影响初探   总被引：4，自引：2，他引：4  

张艳  闵锦忠  王体健 《南京气象学院学报》2002,25(3):413-419

利用2000年夏季南京志区地面气象要素和低层探空资料，分析了该夏季南京城区早、晚低层逆温的频率、厚度和强度变化特征，着重从统计角度研究了逆温的厚度、强度与城区地面温度、相对湿度变化的关系及对人体舒适状况的影响。结果表明：低层逆温对城区地面温湿变化及其幅度影响较大，当07时有逆温层时，08时至14时的温度增加幅度变大，相对温度减小幅度也变大，人体不适指数增加幅度变大；当19时有逆温层时，20时至23时温度减小幅度变小，相对湿度增加幅度也变小，人体不适指数减小幅度变小，并通过相关分析建立了人体舒适度指数与逆温强度之间的回归方程。  相似文献   

浅析解析测图仪相对定向的不定性     

施健 《测绘与空间地理信息》2002,25(1):23-24

通过长期的生产实践提出了相对定向不定性的问题,从相对定向的数学关系着手,列出解求相对定向元素的方程组,分析了产生相对定向不定性的原因,提出了相对定向的结果必须是模拟显示结果与数字显示结果的统一.  相似文献   

Fourcade: the Centenary of a Stereoscopic Method of Photographic Surveying     

Laurence P. Adams 《The Photogrammetric Record》2001,17(98):225-242

In the Preface to his book, The Four Faces of Fourcade, Clare Storrar (1990) wrote: "It is di.cult to appreciate the breadth and depth of Henry Georges Fourcade's intelligence and creative power. He was an intellectual giant, a phenomenon, whose theoretical and practical achievements have never received proper recognition. These were all the more remarkable because he began his original work on photogrammetry when science in South Africa was in its infancy, and he laboured alone far from libraries and other research facilities. His only higher academic training was in land surveying. He was adept in each of four sciences at various stages in his life, but, mainly because of his natural reserve, his reputation was highly compartmentalised. To foresters he was 'the most brilliant forestry officer of his time' to surveyors, he was exceptionally learned in theory and skilled in practice. Photogrammetry was a new subject, unheard of, except by a handful of scientists. In botany, which he took up seriously at the age of fifty-five, his work was highly regarded by leading botanists in South Africa and in Europe. All stood in awe of his extraordinary talent and ability. Some were frightened of him. But few were able—in fact, not even the best brains were wholly qualified—to grasp fully the tremendous intellectual stature and potential of this protean man."
This paper briefly describes the historic achievements of Henry Georges Fourcade, with the emphasis on his land surveying and, in particular, his photogrammetric contributions to science. The centenary of one of these, his proposal of a stereoscopic method of photographic surveying, occurs in October 2001.  相似文献   

THE IMPACT OF RELATIVE HUMIDITY ON THE RADIATIVE PROPERTY AND RADIATIVE FORCING OF SULFATE AEROSOL   总被引：2，自引：0，他引：2  

张立盛  石广玉 《Acta Meteorologica Sinica》2001,(4)

With the data of complex refractive index of sulfate aerosol,the radiative properties of theaerosol under 8 relative humidity conditions are calculated in this paper.By using the concentrationdistribution from two CTM models and LASG GOALS/AGCM,the radiative forcing due tohygroscopic sulfate aerosol is simulated.The results show that:(1)With the increase of relativehumidity,the mass extinction coefficiency factor decreases in the shortwave spectrum;singlescattering albedo keeps unchanged except for a little increase in longwave spectrum,andasymmetry factor increases in whole spectrum.(2)Larger differences occur in radiative forcingsimulated by using two CTM data,and the global mean forcing is—0.268 and—0.816 W/m~2,respectively.(3)When the impact of relative humidity on radiative property is taken into account,the distribution pattern of radiative forcing due to the wet particles is very similar to that of drysulfate,but the forcing value decreases by 60%.  相似文献   

中国西部汛期降水的时空演变分析     

朱姝  周亚军  蔡忠兰  卢俊山 《干旱气象》1996,(3)

用中国西部１０省区（１１０°Ｅ以西）１３０个站的月降水资料，分析夏半年４—１０月的月降水相对系数、月际和年际标准差变化特征。结果表明，各地区受不同降水体系影响，降水在时空上的差异很大。天山北部主要受西风带降水体系影响，月际降水差异不大；西北地区受西太平洋副热带高压雨带影响，降水具有西进北抬尔后东退南辙的特征；高原季风雨带对四川西部、云南和西藏有明显影响，雨季从东南向西北开始，而结束与此相反。月际和年际标准差表明，在以南疆盆地为主的东北—西南一带地区的标准差为高值区，而该地区以东和以北地区的标准差呈逐渐减小趋势  相似文献   

相对点位中误差及其在工程测量中的作用     

梁永成  曲建光 《测绘工程》1995,(4)

阐述相对点位中误差的概念及其在工程测量中的作用,介绍相对点位中误差及相对误差椭园计算方法,以示例说明点位中误差和相对点位中误差的意义和作用。  相似文献   

地表水资源与天津粮食产量的宏观分析     

梁平德  刘爱霞 《气象》1995,21(6):44-47

分析了１９６３－１９９０年天津粮食产量与地表水资源的关系，同时计算了粮食产量随时间增长的趋势议程及扣除增长趋势的粮食相对产量序列。结果表明，由于天津地势低洼易涝，地表水资源量大于３５亿ｍ＾３的丰水年，粮食减产；而当年地表水资源量在３５亿ｍ＾３以下，前一年地表水资源量大于２０亿ｍ＾３，尤其是前一年为丰水年最有利于粮食增产。还分析了地表水资源对水稻、小麦、玉米等三种主要粮食作物的不同影响，揭示了地表水  相似文献   

构造块体的相对运动和应变   总被引：4，自引：0，他引：4  

黄立人  王敏 《大地测量与地球动力学》1999,19(2):17-26

在确定构造块体在球面上相对运动参数的基础上,进一步给出了描述构造块体内的应变变化及参数和确定这些参数的方法。讨论了将相对运动和应变变化综合起来以更充分地描述地壳运动和变形的模型。结合相对运动参数,提出了一种逐渐趋近的变形分析方法。  相似文献   

区域重力场相对基准的建立   总被引：2，自引：1，他引：1  

孙少安  项爱民 《大地测量与地球动力学》1999,19(1):78-81

针对地震系统各区域重力网的现状,提出了一种在没有绝对重力测量资料的情况下,利用网区多年积累的观测资料,建立区域重力场相对基准的方法。实验证明,采用该方法建立的区域重力场相对基准,精度优于５０ｎｍ·ｓ－２,不仅有利于地震重力前兆信息的提取,而且能优化和评定区域重力网的质量,标定和检测重力仪参数及其变化。  相似文献   

A remote sensing model for monitoring soil evaporation based on differential thermal inertia and its validation   总被引：2，自引：0，他引：2  

张仁华  孙晓敏  朱治林  苏红波  唐新斋 《中国科学D辑(英文版)》2003,46(4):342-355

To develop geosciences quantification and multi-dimensional researches will be an inevitable trend in the 21st century. The interaction between the land surface and the atmosphere not only serves as an important component in geosciences quantification, bu…  相似文献