Study on methods of land use dynamic monitoring at county level

Remote sensing technique has played an important role in land use dynamic monitoring, but as for the land use dynamic monitoring at county level, traditional remote sensing methods such as satellite imagery visual interpretation and computer classification can not meet its demand for accuracy. The result of 1: 10 000 land use investigation map has high accuracy, but this method can not be used to dynamically monitor the land use because of its big expenses, long period and difficulty in updating data. In this paper, the characteristics of physiognomy, climate and the status of land use in Dehui County are taken into consideration and a set of method, which takes use of 3S techniques and applies to Northeast China Plain, is come up with. When the land use type of a land parcel changed as a whole, the date updating can be make by changing its land type ID in the attribute table in a GIS. When the land use type of an irregular area changed, GPS receivers are used to position its border. This set of method is characteristic of high accuracy and low expenses. It gets the information of land use change timely and can be used to dynamically monitor the land use. Foundation item: Under the auspices of the key project of the National Ninth Five-year Plan (96-B02-01-07). Biography: LI Lin-yi (1968 —), female, a native of Jilin, Ph. D. candidate of Changchun Institute of Geography, the Chinese Academy of Sciences. Her research interest includes land use change monitoring and crop yield estimation using “3S” techniques.     

LBQS类星体样品球空间功率谱分析

本文用球空间功率谱分析方法研究了ＬＢＱＳ类星体样品的成团性，讨论了ｑ０、边界效应、红移测量误差的影响，并与相关函数的结果进行了比较，认为本样品类星体是不成团的或极弱成团。     

PRECIPITATION PATTERNS IN FLOOD SEASON OVER CHINA ASSOCIATED WITH THE EL NI■O/SOUTHERN OSCILIATION

I.I~IOXENds(EINabs/SouthernOscillation)eventsaretheintensivesignalsofair-seainteractionintropicalarea.PlentyOfresultsfromdifferentresearchersshoWthattheENdssignalcanbedetectedoninterannualvallationsoflargescaleatmOSPhericcirculationandclimateregimeSovermostpartsoftheworld.SeveralkindsofrelationShipbetweenENdsandprecipitationoverChinahavebeenrevealedbydifferentreSearcherS,buttherearemanydifferencesamongthepublishedreSults.Itmayberesulted*fromthatdifferentreSearchersuseddifferentindic…     

宽甸石柱子花岗闪长岩体重砂爆裂普查法在找矿中的应用

通过对石柱子花岗闪长岩体重砂爆裂法研究，发现其轻组分爆裂频次（或活度）有明显差异．并确定区内重砂轻组分爆裂颇次异常下限值为４２００次，据此确定了８个重砂爆裂活度异常区，圈定并缩小了找矿靶区。同时重砂爆裂普查法还可以反映出岩体成矿的可能性，判别岩体的矿化程度．研究表明，重砂爆裂普查法对于发现热液盲矿体具有可行性，可为普查找矿提供信息．     

电子信息化技术在地方资源介绍方面的应用

本文通过对灵宝市矿产资源电子信息化实施的工程实例 ,详细阐述了这种技术方法在介绍地方部门资源方面的优势 ,以及运用它所必须的软件、硬件环境等和实施这种技术的方法。     

珍珠囊发育中马氏珠母贝血清免疫因子的变化规律

马氏珠母贝育珠贝插核手术后的第1、第2、第3、第10、第15、第20、第30和第60天,抽取育珠贝血清,并研究其非特异性免疫因子酸性磷酸酶(ACP)、碱性磷酸酶(AKP)、过氧化氢酶(CAT)、超氧化物歧化酶(SOD)和溶菌酶(LSZ)的活性变化。结果表明:在珍珠囊发育初期(插核后3～10d),育珠贝血清的免疫因子ACP、AKP、CAT、SOD均比对照组(未经插核的马氏珠母贝)显著性增大(P<0.05),LSZ在插核后1～3d比对照组LSZ活性显著性增大(P<0.05);在珍珠囊发育中期(插核后第15～20天),各种免疫酶活性都逐渐降低;珍珠囊发育后期(插核30d后),育珠贝血清中的各种免疫酶活性都已恢复到对照组水平。     

论中印两国间的服务贸易合作

分析了对中印两国间的服务贸易往来现状,阐述了中印两国服务贸易合作的有利因素和不利因素,并对两国服务贸易发展与合作提出了相应的政策建议。     

TOWARDS AN INTEGRATED SCIENTIFIC AND SOCIAL CASE FOR HUMAN SPACE EXPLORATION

I will argue that an ambitious programme of human space exploration, involving a return to the Moon, and eventually human missions to Mars, will add greatly to human knowledge. Gathering such knowledge is the primary aim of science, but science’s compartmentalisation into isolated academic disciplines tends to obscure the overall strength of the scientific case. Any consideration of the scientific arguments for human space exploration must therefore take a holistic view, and integrate the potential benefits over the entire spectrum of human knowledge. Moreover, science is only one thread in a much larger overall case for human space exploration. Other threads include economic, industrial, educational, geopolitical and cultural benefits. Any responsibly formulated public space policy must weigh all of these factors before deciding whether or not an investment in human space activities is scientifically and socially desirable.     

Relative contributions of sublimation and volcanoes to Io's atmosphere inferred from its plasma interaction during solar eclipse

We present a model that describes Io's delayed electrodynamic response to a temporal change in Io's atmosphere. Our model incorporates the relevant physical processes involved in Io's atmosphere-ionosphere-magnetosphere electrodynamic interaction to predict the far-ultraviolet (FUV) radiation as Io enters Jupiter's shadow and re-emerges into sunlight. The predicted FUV brightnesses are highly nonlinear as the strength of the electrodynamic interaction depends on the ratios of ionospheric conductances to the torus Alfvén conductance, but the former are functions of electrodynamics and the atmospheric density, which decays rapidly upon entering eclipse. Key factors governing the time evolution are the column density due to sublimation and the column density due to volcanoes, which maintain the background atmosphere during eclipse. The plasma interaction does not react instantaneously, but lags to a temporarily changing atmosphere. We find three qualitatively different scenarios with two of them including a post-eclipse brightening. The brightness ratio of in-sunlight/in-eclipse coupled with the existence of a sub-jovian equatorial spot constrains the volcanic column density to several times 10¹⁸ m⁻², based on the currently available observations. Thus in sunlight, the sublimation driven part of Io's atmosphere dominates the volcanically driven contribution by roughly a factor of 10 or more.     

论唐代诗文中的大鹏形象

唐代人喜欢写鹏,《全唐文》与《全唐诗》中留下了大量与“鹏”有关记载。鹏的形象内涵在唐代的不同阶段是不尽相同的,它与国运联系紧密。初唐,鹏的形象反映了这一时期熙熙攘攘、奋发向上的社会风尚；盛唐,鹏的形象反映了意气昂扬、绚烂多彩；中唐,则回归到对《逍遥游》主旨的阐发,反映出遁世的态度；晚唐,出现了以《庄子》中“蝴蝶”“螳螂”等朝不保夕的小虫为描写中心的文章,表现出文人对社会现实的失望与对李唐王朝的离心。