13CO (J = 1 - 0) emission of massive star forming region including 15 ultracompact and 4compact HII regions in Galactic plane was mapped with the 13.7 m millimeter wave telescope of Purple Mountain Observatory. The pr...13CO (J = 1 - 0) emission of massive star forming region including 15 ultracompact and 4compact HII regions in Galactic plane was mapped with the 13.7 m millimeter wave telescope of Purple Mountain Observatory. The present observations provide the first complete structure of the clouds in 13CO with a higher spatial resolution and a wide-field coverage of 28′×45′. Combined with the images of far-infrared emission and dust color temperature obtained from ISSA, various possible dynamical connections between the compact HII regions and associated clouds were found. We presente some reasons to explain the formation of new dense cold core and molecular emission cavity in the massive star formation and early evolution. The luminosities of excitation stars for all HII regions and the main parameters of associated clouds are also derived. The results show that the newborn stars' luminosities are correlated with the 13CO column densities, masses (in 55'beam) and 13CO velocity widths obviously.展开更多
云存储技术具有效率高、可扩展性强等优点。用户可以借助云存储技术节省本地的存储开销,并与他人共享数据。然而,数据存储到云服务器后,用户失去对数据的物理控制,需要有相应的机制保证云中数据的完整性。数据拥有证明(PDP,provable dat...云存储技术具有效率高、可扩展性强等优点。用户可以借助云存储技术节省本地的存储开销,并与他人共享数据。然而,数据存储到云服务器后,用户失去对数据的物理控制,需要有相应的机制保证云中数据的完整性。数据拥有证明(PDP,provable data possession)机制允许用户或用户委托的第三方审计员(TPA,third party auditor)对数据完整性进行验证。但在实际应用中,数据通常由多个用户共同维护,用户在进行完整性验证请求的同时泄露了自己的身份。匿名云审计支持TPA在完成数据完整性验证时保证用户的匿名性。在基于身份体制下,匿名云审计方案通常需要借助基于身份的环签名或群签名技术实现,数据标签的构成元素与用户数量相关,使得数据标签不够紧凑,存储效率较低。为了解决这一问题,提出一种基于身份的匿名云审计方案通用构造,使用一个传统体制下的签名方案和一个传统体制下的匿名云审计方案即可构造一个基于身份的匿名云审计方案。基于该通用构造,使用BLS签名和一个传统体制下具有紧凑标签的匿名云审计方案设计了具有紧凑标签的基于身份匿名云审计方案。该方案主要优势在于数据标签短,能够减少云服务器的存储压力,提高存储效率。此外,证明了该方案的不可欺骗性和匿名性。展开更多
基金This work was supported by the National Natural Science Foundation of China (Grant No. 19873003) United Laboratory of National Radio Astronomy.
文摘13CO (J = 1 - 0) emission of massive star forming region including 15 ultracompact and 4compact HII regions in Galactic plane was mapped with the 13.7 m millimeter wave telescope of Purple Mountain Observatory. The present observations provide the first complete structure of the clouds in 13CO with a higher spatial resolution and a wide-field coverage of 28′×45′. Combined with the images of far-infrared emission and dust color temperature obtained from ISSA, various possible dynamical connections between the compact HII regions and associated clouds were found. We presente some reasons to explain the formation of new dense cold core and molecular emission cavity in the massive star formation and early evolution. The luminosities of excitation stars for all HII regions and the main parameters of associated clouds are also derived. The results show that the newborn stars' luminosities are correlated with the 13CO column densities, masses (in 55'beam) and 13CO velocity widths obviously.
文摘云存储技术具有效率高、可扩展性强等优点。用户可以借助云存储技术节省本地的存储开销,并与他人共享数据。然而,数据存储到云服务器后,用户失去对数据的物理控制,需要有相应的机制保证云中数据的完整性。数据拥有证明(PDP,provable data possession)机制允许用户或用户委托的第三方审计员(TPA,third party auditor)对数据完整性进行验证。但在实际应用中,数据通常由多个用户共同维护,用户在进行完整性验证请求的同时泄露了自己的身份。匿名云审计支持TPA在完成数据完整性验证时保证用户的匿名性。在基于身份体制下,匿名云审计方案通常需要借助基于身份的环签名或群签名技术实现,数据标签的构成元素与用户数量相关,使得数据标签不够紧凑,存储效率较低。为了解决这一问题,提出一种基于身份的匿名云审计方案通用构造,使用一个传统体制下的签名方案和一个传统体制下的匿名云审计方案即可构造一个基于身份的匿名云审计方案。基于该通用构造,使用BLS签名和一个传统体制下具有紧凑标签的匿名云审计方案设计了具有紧凑标签的基于身份匿名云审计方案。该方案主要优势在于数据标签短,能够减少云服务器的存储压力,提高存储效率。此外,证明了该方案的不可欺骗性和匿名性。
基金Project supported by the National Natural Science Foundation of China(No.51439005)the National Basic Research Program(973 Program)of China(No.2013CB035906)the National Natural Science Foundation of Innovation Group(No.51621092),China
