An iterative algorithm in potential-field inversion

1　Principle and MethodAll the problems of potential- field inversioncan be concluded that of solving nonlinear functionas follows:b =f( x) ( 1 )where x =( x1,x2 ,… .xn) T,xj( j =1 ,2 ,… ,n)indicate geometricparameters and physical parame-ters of the object;b=( b1,b2 ,… ,bm) T,bi( i=1 ,2 ,… ,m) indicate potential- field measurements.Main algorithms for expression( 1 ) are leastsquare method ( include damping least squaremethod ) ,gradient method ( conjugate gradientmethod and variable met…     

China'''' s Fundamental Research in Energy Utilizations and Environment

The progress in the science of energy utilizations will act crucial effect on the developments of energy science and technology, which will then promote social and economical developments and fulfill requirements for the national strategic objectives. For the sake of sustainable development, a harmonious blend of energy utilizations and environment considerations will become one of the vital topics in the future research area of energy science. It is suggested that clean and high-efficiency utilization of traditional or fossil energy resources, fundamental investigations on the energy and environment theory, renewable energy utilizations, and the development of nuclear energy are selected as priority research areas during the period of the Tenth Five-year Plan of China, according to the development trend of the world energy science and the research background of Chinese energy science. It is expected to promote the interdisciplinary investigations in the science of energy u-tilizations and provide scien     

一类非线性系统的次谐波分枝问题

研究了具有周期外力的非线性系统的解产生不同的次谐波分枝的参数范围，并且指出了无穷多次谐波分枝是如何与smale马蹄型混沌解共存的．     

CHARACTERIZATION OF SOL-GEL-DERIVED ZrO2 FILM BY PHOTOTHERMAL RADIOMETRY

In modern industry,thin film on the substratc has much important role to decide the properties of product, especially for electrical, optical and wear-resistant etc, production. There are some technical methods to prepare thin film,including plasma spray,physical vapor deposition (PVD),chemical vapor deposition (CVD) and sol-gel,etc. Among of them,sol-gel method has been developed a popular tech nique for preparing thin films.     

中国京津唐张地区时间上连续的重力变化与地震的孕育和发生

近１５年来，京津津唐张地区发生出十几个４－５级的地震，通过对北京白家蝉台观测到的时间连续着力变化变化资料的分析，伴随地震孕育和发生有关的重力变化基本图象已经呈现出来。     

A STUDY ON FLORISTIC FEATURE AND DIVERSITY OF DEHANG REGION SEED PLANTS IN HUNAN

1IntroductionDehangisascenicspotlocatedatthesouthofWulingMTsintheCentralChil1a,between2815'and2843'N,lo93o'andlO945lE,risingfroml89.4mto964.6mabovesealevel,withanareaof225km.Thisre-gionhasacomplicatedtopography.Itissituatedinsubtropicmonsoonclimateareaandrichinlimestone.Ev-ergreebroad-leavedforest,Bambooforestandlowsimountainevergreenconiferousforestaremainvegeta-tionshere'Moreover,Miaonationalitypeoplehhvebeenlivinghereforalongtimeanditenjoysgreatnation-a1navour.Thenoraisrichandthevegeta…     

A VERIFICATION METHOD FOR COMMUNICATION PROTOCOLS MODELED AS COMMUNICATING EXTENDED FINITE─STATE MAC

本文建立了用于表述含有无限值状态成分的通讯协议机的抽象模型，给出了基于该模型的形式检证法，试制了检证系统．该检证法不需要假定信道的有界性．对于给定的通信协议，检证系统将判定其对指定状态的可到达性．做为检证例，从ＯＳＩ参照模型中抽出了大同步点设置功能单位，就“无死锁”、“无传输错误”等性质进行了实际检证     

NETS OF LF SETS IN LF SUM─TOPOLOGICAL SPACES

ＮＥＴＳＯＦＬＦＳＥＴＳＩＮＬＦＳＵＭ─ＴＯＰＯＬＯＧＩＣＡＬＳＰＡＣＥＳ￥ＺｈｕＭｉｎｇｋｕｉ；ＳｕｎＱｕｎ（ＴｈｅＤｅｐａｒｔｍｅｎｔｏｆＭａｔｈｅｍａｔｉｃｓ）Ａｂｓｔｒａｃｔ：Ｉｎｔｈｉｓｐａｐｅｒ，ｗｅｄｉｓｃｕｓｓｔｈｅｒｅｌａｔｉｏｎｏ...     

蕴涵环交换性的某些多项恒等式

设ｍ＞１，ｎ，ｐ，ｑ，ｒ，ｓ均为正整数，Ｒ是一个具有单位元１的环．证明了：如果Ｒ中的任意ｘ，ｙ满足且Ｒ具有Ｑ（ｍ）性质，则Ｒ是一个交换环．此外，在适当的条件下确立了Ｒ的交换性．     

Evaluation of Surface Modification of Inorganic Filers

ＥｖａｌｕａｔｉｏｎｏｆＳｕｒｆａｃｅＭｏｄｉｆｉｃａｔｉｏｎｏｆＩｎｏｒｇａｎｉｃＦｉｌｅｒｓＣｈｅｎＨｏｎｇｇａｎｇ（Ｄｅｐｔ．ｏｆＣｈｅｍ．Ｅｎｇ．）ＡｂｓｔｒａｃｔＴｈｒｅｅｋｉｎｄｓｏｆｉｎｏｒｇａｎｉｃｆｉｌｅｒｓｗｅｒｅａｃｔｉｖａｔ...