简介:Host:WhenwelastspokewithBenRainesofthe1)WeeksBayFoundationinAlabamaaboutayearago,hetoldusanamazingstoryaboutanunderwaterwoodlandoffthecoastofAlabama.Localfishermanhaddiscoveredamysteriously2)fishy3)patchofocean,andwhendiverscheckeditouttheyfoundaforestofancient4)cypress5)stumpsontheoceanfloor.Sincethen,Benhasbeen6)collaboratingwithscientiststostudythe7)submergedtreesandworkingona8)documentaryaboutit.
简介:摘要以广东省某海底隧道项目为例,介绍了Intercrete产品在混凝土负向抗渗的应用。实践证明,Intercrete产品在新建及维修项目上可以有效抵抗极高的负向渗水,性能优异且安全可靠,可施工在湿混凝土结构表面,工期短,施工方法及工艺流程简单,涂料安全、无毒害,非常适合过海、公路、地铁等隧道的防渗和保护,具有广阔的应用前景。
简介:Themethodofcoupledmodeisintroducedforinvestigationofbi-staticdistantbottomreverberationofimpulsivesourceinshallowwater,whichwillnotcontradictwithprincipleofreciprocityinallcases.Andthemethodofmulti-polefordirectionalsourceisalsointroduced.Itshowsthatincaseoflayeredmedium,intensityofbi-staticbottomreverberationwilldeceaseaccordingtothecubicpowerofreceivingtimet,andthetransversespatialcorrelationofbottomreverberationisalittlegreaterthanlongitudinalcorrelationforequalseparationofreceivers,andbothvaryinformwiththereceivingtime.