2005年5月中旬，英国联合信息系统委员会（UK Joint Information Systems Committee，JISC）集成信息系统委员会主席RegCarr在荷兰首都阿姆斯特丹举行的国际会议上代表JISC签署了《关于自然科学与人文科学资源的开放使用的柏林宣言》，...2005年5月中旬，英国联合信息系统委员会（UK Joint Information Systems Committee，JISC）集成信息系统委员会主席RegCarr在荷兰首都阿姆斯特丹举行的国际会议上代表JISC签署了《关于自然科学与人文科学资源的开放使用的柏林宣言》，即《柏林宣言》。《宣言》呼吁签署者促进“更多地利用因特网进行知识传播”。展开更多
介绍了支持英国数字图书馆研究的四类主要基金来源：高等教育基金、英国研究委员会、政府部门和慈善基金，对这些基金资助了的或正在资助的一些数字图书馆研究计划，如JISC Information Environment、eLib、RSLP等进行了阐述。希望从一...介绍了支持英国数字图书馆研究的四类主要基金来源：高等教育基金、英国研究委员会、政府部门和慈善基金，对这些基金资助了的或正在资助的一些数字图书馆研究计划，如JISC Information Environment、eLib、RSLP等进行了阐述。希望从一个侧面来勾画出英国数字图书馆研究的现状。展开更多
This paper aims at probing the flow characteristics of a jet in supersonic crossflow(JISC)by installing a vortex generator(VG)upstream of the jet orifice.Nanoparticle planar laser scattering(NPLS)and stereo-particle i...This paper aims at probing the flow characteristics of a jet in supersonic crossflow(JISC)by installing a vortex generator(VG)upstream of the jet orifice.Nanoparticle planar laser scattering(NPLS)and stereo-particle image velocimetry(SPIV)technologies were employed to observe the flowfield,and three cases were designed for comparison.CASE0 stands for JISC without passive VG.In CASE1 and CASE2,VG is installed at 20 mm and 80 mm upstream away from the jet orifice,respectively.Transient flow structures show that two flow modes exist when the VG wake interacts with the JISC.In CASE1,vortices are induced from both sides of the jet plume because of the VG wake.This leads to a complex streamwise vortex system.Penetration and lateral diffusion are enhanced.In CASE2,intermittent large-scale eddies in the VG wake cause large streamwise vortices at the windward side of the jet.The penetration depth is also enhanced while the lateral diffusion is restrained.In addition,experimental results show that the penetration depth is approximately 8.5%higher in CASE1 than that in CASE0,and the lateral diffusion is larger by about 17.0%.In CASE2,the penetration is increased by about 26.2%,while the lateral diffusion is enhanced by just 0.5%.展开更多
文摘2005年5月中旬，英国联合信息系统委员会（UK Joint Information Systems Committee，JISC）集成信息系统委员会主席RegCarr在荷兰首都阿姆斯特丹举行的国际会议上代表JISC签署了《关于自然科学与人文科学资源的开放使用的柏林宣言》，即《柏林宣言》。《宣言》呼吁签署者促进“更多地利用因特网进行知识传播”。
基金supported by the National Natural Science Foundation of China(Nos.91541203 and 51676204)the Fenglei Youth Innovation Fund of China Aerodynamics Research and Development Center(No.PJD20170186)。
文摘This paper aims at probing the flow characteristics of a jet in supersonic crossflow(JISC)by installing a vortex generator(VG)upstream of the jet orifice.Nanoparticle planar laser scattering(NPLS)and stereo-particle image velocimetry(SPIV)technologies were employed to observe the flowfield,and three cases were designed for comparison.CASE0 stands for JISC without passive VG.In CASE1 and CASE2,VG is installed at 20 mm and 80 mm upstream away from the jet orifice,respectively.Transient flow structures show that two flow modes exist when the VG wake interacts with the JISC.In CASE1,vortices are induced from both sides of the jet plume because of the VG wake.This leads to a complex streamwise vortex system.Penetration and lateral diffusion are enhanced.In CASE2,intermittent large-scale eddies in the VG wake cause large streamwise vortices at the windward side of the jet.The penetration depth is also enhanced while the lateral diffusion is restrained.In addition,experimental results show that the penetration depth is approximately 8.5%higher in CASE1 than that in CASE0,and the lateral diffusion is larger by about 17.0%.In CASE2,the penetration is increased by about 26.2%,while the lateral diffusion is enhanced by just 0.5%.
