简介:EveryonewhopassesthroughBeijing'sForbiddenCityleavesthegroundswithtwowordsontheirlips:magnificentandawe-inspiring.TheseatofimperialpowerduringtheMingandQingdynasties(1368-1911),sometwenty-fouremperorsruledthenationfromwithinthesewalls.NowmorecommonlyknownasthePalaceMuseum,theForbiddenCityliesatthecenteroftheChinesecapital.Extending750metersfromeasttowestand960metersfromnorthtosouth,the720,000-square-metercityisthelargestpalatialcomplexintheworld.Guardingthecityisa52-meter-wide,six-meter-deepmoat,andahugewall,whichrunsthreekilometersaroundthecityandstands10metershigh.Constructionlasted15years,involving100,000artisansandsomeonemillioncivilians.IfthebricksthatmakeuptheForbiddenCitycouldspeak,theywouldhavemanyaninterestingstorytotell.Herearejustafewanecdotes.
简介:<正>Thedictionarydoesn’tcontainenoughadjectivestodescribeBeijing’snumberoneattraction:splendid,impressive,brilliantinitsconception,magnificent,majestic,imposing.But-I’lltellyouonething,"Onceisenough".
简介:Baishan:AnAncient"Forbidden"CityOpensUpByLIMINGEVERYCHINESEknowstheancientstocyof"TheFoolishOldMan"who,withhissonsandgrandsons,...
简介:Fornon-negativeintegersi,jandk,wedenotethegeneralizednetasN_(i,j,k),whichisatrianglewithdisjointpathsoflengthi,jandk,attachedtodistinctverticesofthetriangle.Inthispaper,weprovethatevery3-connected{K_(1,3),N_(8-i,i,1}-freegraphishamiltonian,where1≤i≤4.
简介:基于飞机波浪方法,有在x-y飞机的45°的全部格子旋转的木柴堆结构photonic水晶的完全的禁止的乐队的光性质理论上以height-to-pitch比率,充满的因素,和旋转角度被学习。计算结果证明到中间差距的比率的差距随着充满的部分从0.25~0.30稍微变化。最佳height-to-pitch比率是大约1.3。当旋转角度与1.3的经常的height-to-pitch比率从42°从40°增加到50°和最大的差距到为旋转角度未改变的0.2个遗体的中间差距的比率到48°时,到中间差距的比率的差距到达超过0.18。当height-to-pitch比率是1.3时,到中间差距的比率的差距到达0.2的最大的价值。这木柴堆类型photonic晶体能在一个更宽的参数范围以内提供大乐队差距,它使在实验室生产三维的photonic晶体方便。