简介:摘要国土资源对于国家,对于国家的社会居民而言,是非常重要的物质需要,是国家发展及国家居民赖以生存的物质基础,国土资源包括土地、气候等自然资源和国家人口资源与社会经济资源。国土资源的整合规划工作是国家社会建设和社会经济发展的重要前提工作,国土资源测绘是国土资源整合规划工作前提,更是重要工作组成,国土资源测绘为国土资源整合规划提供客观科学的数据指导,进而保证国土资源整合规划的科学性与合理性。国土资源测绘工作中不断引进先进科学技术,3S技术的引进为国土资源测绘工作带来了很大便利,有效提升国土资源测绘工作效率以及进一步确保国土资源测绘工作的质量。本文笔者对3S技术进行简单概述,研究其在国土资源测绘工作的运用价值。
简介:摘要为了规范路灯TN-S配电系统的单相接地短路保护,通过工程实例对路灯TN-S配电系统单相接地短路电流的计算,探讨了在TN-S配电系统中干线开关的选择要点,干线开关应优先选用具有短延时保护的B类断路器,也可选用RCD开关保护。
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简介:Indisputably,thedesireforsenseofsecurityasapartofsocietybringsaboutCitizens'aspirationforsoundwelfare.It'snotonlythewishesofcitizensofcapitalisticstatesbutsocialistcountries.ThispaperfocusesonanalyzingwhetherChinaisawelfarestategroundedonthestudyofEsping-Andersen’stheories.Itconsistsofthreedimensions,conceptualdefinitionspublishedbyAsaBriggsandEsping-Andersenistheprimaryone,thenthebasicthreedirectionstomodifytheplayofmarket(AsaBriggs)arestatedasthecriteriatomeasureastate,thethirdpartistheprincipleEsping-Andersenproposed,andthreekindsofwelfarestatebasedontheprinciple.Tomaketheresearchmoreevident,exampleswillbeutilizedasfollows.
简介:In1929,AmericanastronomerHubblefirstdiscoveredthattherecessionalvelocityofagalaxyincreaseswithitsdistancefromtheearth,andthereforeputforwardHubble’slaw.ItisconsideredthefirstobservationalbasisfortheexpansionoftheuniverseandtodayservesasoneofthepiecesofevidencemostoftencitedinsupportoftheBigBangmodel.SincethentheastrophysicscommunityhasbelievedthattheuniverseisinaconstantrateofexpansionuntilSaulPermutter,BrianPaulSchmitandAdamGuyRieesdiscoveredtheacceleratingexpansionoftheuniversethroughobservationofseveraldozendistantsupernovasin1998,whothenwontheNobelPrizeinPhysics2011.Buthumanstillcannotcompletelyexplainthephenomenonthattheuniverseisexpandingatanever-acceleratingrate.Thustheauthorofthispaperstudiedtheoriginandevolutionofgalaxiesagain,andrevealedthestructureofgalaxyandprovedHubble’slaw,thenrevealedthetruthabouttheexpansionoftheuniverseaswellasdarkmatteranddarkenergy.