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《中国民用航空》1999,(4)
Generalaviation,asanimportantpanofChina'scivilaviationindustryisnowfacedbybadeconomicbenefitsandflightsafetysituation,disorderofthemarketcompetition,deteriorationoftheguaranteeingenvironment,backwardnessoftheserviceandthefacilities,theimperfectionoftheregulation,unclearresponsibility,aswellasthelackofadaPtabilityandthemanagement'saimlessness.Gradually,withthedevelopmentofboththenationaleconomyandthesocietyitisbecomingthehotpointtopromotegeneralaviation.l.Themainpartofthegeneralaviationoperator… 相似文献
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本文在文[1]的基础上,对人造卫星轨道理论中的误差传播规律再次进行了研究,并给出了所需各量的具体估计公式: (1)卫星坐标Υ和速度Υ在径向(S)、切向(T)和法向(W)三方向的投影, (2)卫星改进根数i,Ω,ξ,η,λ,n,n,n,n; (3)卫星预报根数a,e,ω,M,T_Ω,P_Ω,P_Ω,P_Ω,P_Ω; (4)卫星观测量α,δ,A_N,h,ρ,ρ; (5)卫星星下点坐标L,φ,H 相似文献
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SupportedbytheNationalNaturalScienceFoundationandtheShaanxiNaturalScienceFoundationofChinaNomencIaturescd-externaldampingCP-machinedclearanceofbearingD.-externaldampingratio(=c,/(2m,eq))e.-theunbalanceeccentricityfx,f,-fluidfilmforcesk,-complexstiffnessofcrackedshaftk.-stiffnessofuncrackedshaftke,k,-stiffnessofcrackshaftin$,Vdirec-tlonsAse,As,-thelargeststiffnesschangemb,md-masslumpedatbearingandrotormid-spanS,-fiXedSommerfeldnumber(=S/n,SistheSommerfeldnumber)U-unbalanceparameter(=e./… 相似文献
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雪点香炉,佳绝黄河!冬日的陕北,雪意中更显奇幻。黄河万里奔腾而来,一路势如破竹,劈开万仞崇山,呼啸而出,身腰一扭,就能打造出一个绝色景致,陕北佳县香炉寺即是。香炉寺位于县城东二百米的香炉峰峰顶,东临黄河,三面绝空,仅西北面以一狭径与县城古城门相通。寺下有一巨石如柱,立于黄河之中,石顶平阔,形如高足香炉,故得寺名,中国南北寺庙量不在少,东西道观难以数计,但如香炉寺筑造之精巧,建制之玲珑,景色之美妙者,绝无仅有。 相似文献
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《中国航空学报》2004,(1)
1 ChineseJournalofAeronautics (CJA) ,acomprehensiveacademicjournalinthefieldofaeronauticsandastronautics ,sponsoredbytheChineseSocietyofAeronauticsandAstronautics ,isaquarterlyinEnglish ,issuedinFebruary ,May ,AugustandNovember.TheCJA ,startedin 1988,consistedoriginallyofselectedpaperstranslatedfromtheActaAeronauticaetAs tronauticaSinica (AAAS) (inChinese) .Beginningfrom 1996 ,somecontributedpaperstothePressofAAAShavebeendi rectlyadoptedandeditedasarticlesinCJA ,andthepublication… 相似文献
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《航空标准化与质量》1982,(3)
1.译校者必须树立实事求是的科学态度,严肃认真,一丝不苟地忠实原文,精确表达原意,确保译文质量。译稿完成后,译者应首先全面进行自校,然后再请校稿人校订。校者应逐字逐句核对原文,改正错漏,修饰润色,精练文字,校正标点,做到准确表达,语言简练,逻辑严谨,符合规范。 相似文献