A CHARACTERIZATION OF REALCOMPACT STONIAN SPACES X AND EXTENDED RIESZ HOMOMORPHISMS ON C~∞(X)

1. IntroductionBy R(= [--co, co]) we denote the two-point compactification of the real line R. The rulesfor addition and multiplication are extended to boo in the usual wad, i.e., for ally af A E Rand A > 0, we define a (f co) ~ boo, (boo) (loo) = boo, A. (boo) = boo, (--A). (boo) =Too, (boo).(~oo) = co and (loo).(Too) = --co, where it is understood that the multiplicationobeys 0' (boo) ~ (loo)' 0 = 0. For any p) q E R, we say that p q makes sense whenever thecase of p ~ co and q…     

LOWER BOUND ON K-SEQUENCE

1.IntroductionK-sequenceswereilltroducedbyKl0vein[1]-Itisaclassofsequencesthatinparticularcoatainsthesonarsequences[2]andBh-sequences.Resultsthatwerepreviouslyconsideredforeach0fthesesubclassescaninmanycasesbegeneralizedtoK-sequencesandbegivenaunifiedtreatment.Thesesequenceshaveanumber0fapplicati0ns.F0rinstance,Bh-sequenceswereappliedininterm0dulation-freefrequenciesassignment(see[3,4]).AclassofK-sequencesnotpreviouslyconsideredwereimportaninaconstructionofilltermodulationfreefrequenciesass…     

HARMONIC MAPS VERSUS POISSON EQUATIONS ON NONCOMPACT RIEMANNIAN MANIFOLDS

1.Introducti0llStartingfromtheworkofP.LiandT.F.Taml1'2])therearesomeprogressonthestudyofharmonicmaPsbetweennegativelycurvedc0mplete,noncompactriemannianmanifolds.Wemayquote[2-5]justforafew.Thenewstartingpoilltin[1]isthea-ssumption0fagivenmaPwithitstensi0nfieldinasuitableSob0levspace.Asacomparison,wementi0nthatthekeytechniqueofthemethod0fEells-Sampsonl6]istheuseofaBochnertypeevoluti0n0ftheenergydensitywithaninitialdataoftotalenergy.InthispaPer,wetrytogivealargec1assofapprokimateharmonicma…     

STUDY ON HARVESTED POPULATION WITH DIFFUSIONAL MIGRATION

1 IntroductionBiological resources are renewable resources. Ih the eXPlOitation of population resources)both the economic benefits and the environmelltal effects must be taken icao accoullt. Theharvesting problexns on the pOPulation have been studied otensively in the literature [1--3]. Inpractical management, because of wrong exPloitation, some resouxces population are exploitedtoo heavily, and in the 6Xtreme case, are driven to 6Xtinction.In order to prevent the resources population from…     

THE COMPLEXITY OF LIMIT LANGUAGES OF CELLULAR AUTOMATA: AN EXAMPLE

1 IntroductionCellular automata (abbreviated as CA) are typical complex systems that their global behaviors cannot be PrediCted from the Properties of their componellts (i.e. cells or automata)which are identically located on the nodes of a periodic lattice and have the same updatingrules.Historicallys the first cellular automaton was proposed by von Neumann to formalize thereproductivity phenomena in living systems[IJ. Since then cellular automata as mathematicalmodels have been used to si…     

The General Technique of Selected Harmonics Elimination for Multilevel Converters

With the rapid developmentofeconomy,thereis a very large demand for power converters,especially for high power converters since the lowvoltage low power converter market becomes moreand more saturated.The converters for high powerhigh voltage applications are facing a new era inthe next decades,so many researchers have paidtheir attention on the converter structures,themost competitive one of which is the multilevelconverter. Selected harmonics elimination PWMtechniques for multilevel convert…     

The Narrative Complexities of As I Lay Dying

AsILayDyingWaspublishedin１９３０，im－mediatelyfollowingWilliamFaulknersanothermasterpieceTheSoundandtheFury．Thetwonov－elsbearcertainsimilaritiesinboththemeandwritingtechnique．AsFaulkneradmittedinaninterviewwithcollegestudents：“bothofthemhappenedtohaveasisterinaroaringgangofmenfolks．”〔１〕Howeverthenovelsresembleeachothermorethanthat．Becausetheclosenessoftheirwritingtime，theyunmistakablysharesimilaritiesinnarrativede－signandtechnique．Theyareexperimentalworksoforiginality，whi…     

书评:《中国数学的西化历程》、《中国近代数学教育史稿》、《中国近代代数史简编》北大核心CSCDCSSCI

田淼著:《中国数学的西化历程》,济南:山东教育出版社,2005年,416页,定价44.50元,ISBN∶7-5328-4980-5。李兆华主编:《中国近代数学教育史稿》,济南:山东教育出版社,2005年,260页,定价30.00元,ISBN∶7-5328-4804-3。冯绪宁、袁向东著:《中国近代代数史简编》,济南:山东教育出版社,2006年,198页,定价24.50元,ISBN∶7-5328-5394-2。     

卫星相关研究概述

1卫星稳定法 卫星的在轨稳定可由下述主动或被动方法获得。 1.1重力梯度 重力梯度是一种被动稳定方法,有时用于LEO小卫星。作用在卫星上最靠近和最远离地球的部件上的引力差形成一个力矩,该力矩维持卫星姿态与当地铅垂线一致。为得到足够的力矩,需在卫星上安装长杆。由于地球同步轨道上的引力差为零,故该法不适用于地球同步卫星。     

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