Optical fiber-based sensors are usually applied in structural health monitoring(SHM)as part of smart materials.The weak interface between the optical fiber and the host material will reduce the mechanical performance ...Optical fiber-based sensors are usually applied in structural health monitoring(SHM)as part of smart materials.The weak interface between the optical fiber and the host material will reduce the mechanical performance of the smart materials.Normally,the principal parts of the optical fibers are inorganic,while the matrix of host material is organic.These two kinds of materials can not be combined.Micro-fracture can be found in smart materials.Two methods for improving the interface are proposed.Firstly,the influence of the interface size on the strength is studied.Secondly,interfacial treatment before embedding the optical fiber into the composite is analyzed.Compressive tests of composite laminated specimens are conducted to evaluate the proposed methods.The specimens are produced from T300Carbon/epoxy prepreg,with different treated optical fiber embedded inside.The experimental results indicate that smaller interface size and proper treatment will strengthen the whole structure.展开更多
关于电子邮件安全问题的研究由来已久。人们采用了PKI(Public Key Infrastructure)、IBE(Identity Based Encryption)等技术来提高邮件的安全性。PKI技术虽然较成熟但认证环节复杂。IBE技术简单易用,但在身份认证上存在较多缺陷。该文...关于电子邮件安全问题的研究由来已久。人们采用了PKI(Public Key Infrastructure)、IBE(Identity Based Encryption)等技术来提高邮件的安全性。PKI技术虽然较成熟但认证环节复杂。IBE技术简单易用,但在身份认证上存在较多缺陷。该文采用的FIBE(Fingerprint Identity Based Encryption)技术结合了IBE技术与指纹识别技术的优势,解决了IBE或指纹识别单项技术所不能解决的诸多问题。该文通过将FIBE技术应用到qmail邮件服务器端,使得电子邮件的安全性得到了进一步提高。展开更多
基金supported by the National Natural Science Foundation of China(No.11402112)the Postdoctoral Science Foundation of Jiangsu Province (No. 1302071B)
文摘Optical fiber-based sensors are usually applied in structural health monitoring(SHM)as part of smart materials.The weak interface between the optical fiber and the host material will reduce the mechanical performance of the smart materials.Normally,the principal parts of the optical fibers are inorganic,while the matrix of host material is organic.These two kinds of materials can not be combined.Micro-fracture can be found in smart materials.Two methods for improving the interface are proposed.Firstly,the influence of the interface size on the strength is studied.Secondly,interfacial treatment before embedding the optical fiber into the composite is analyzed.Compressive tests of composite laminated specimens are conducted to evaluate the proposed methods.The specimens are produced from T300Carbon/epoxy prepreg,with different treated optical fiber embedded inside.The experimental results indicate that smaller interface size and proper treatment will strengthen the whole structure.
文摘关于电子邮件安全问题的研究由来已久。人们采用了PKI(Public Key Infrastructure)、IBE(Identity Based Encryption)等技术来提高邮件的安全性。PKI技术虽然较成熟但认证环节复杂。IBE技术简单易用,但在身份认证上存在较多缺陷。该文采用的FIBE(Fingerprint Identity Based Encryption)技术结合了IBE技术与指纹识别技术的优势,解决了IBE或指纹识别单项技术所不能解决的诸多问题。该文通过将FIBE技术应用到qmail邮件服务器端,使得电子邮件的安全性得到了进一步提高。
