[Objectives] The research aimed to identify Paris polyphylla with different growth year numbers and evaluate its resource quality.[Methods]Comparative research on P. polyphylla with different growth year numbers was c...[Objectives] The research aimed to identify Paris polyphylla with different growth year numbers and evaluate its resource quality.[Methods]Comparative research on P. polyphylla with different growth year numbers was conducted by using morphological identification and microscopic identification method. [Results] By contrasting original plant morphology,transverse sections of rhizome and fibrous root,powder,it displayed that microstructure of P. polyphylla had regularity difference in cell shape and size,duct quantity,trait and size,size and distribution of calcium oxalate cluster crystal. [Conclusions] The microstructure change of P. polyphylla was related to the number of its growth year,which could provide the reference for identifying the growth year number of P. polyphylla and evaluating its resource quality.展开更多
The effect of vacuum cooling on shelf life of organic chayote was investigated. Vacuum cooling processes of organic chayote shoot packed in perforated polyethylene package using different vacuum pressure reserving ope...The effect of vacuum cooling on shelf life of organic chayote was investigated. Vacuum cooling processes of organic chayote shoot packed in perforated polyethylene package using different vacuum pressure reserving operation modes were experimented. The holding final pressures for vacuum-cooled organic cilantro packed in holed polyethylene bags were set at two different levels, namely at 10 and 11 millibar. The pressures were experimented with 3 levels of reserving time of 3, 4 and 5 minutes. The weight loss percentage of chayote shoot during precooling to the temperature of 8 ~ 1 ~C using reserving pressure of 10 milibars for 3, 4, and 5 minutes were 0.5, 0.7, and 0.9, respectively. For the weight loss percentage during precooling using reserving pressure of 11 milibars for 3, 4, and 5 minutes were 0.4, 0.5, and 0.5, respectively. The optimum parameter for vacuum cooling process of organic chayote shoot at the initial temperature of 19-23 ℃to 8 ±1 ℃was the reserving pressure of 11 mbar with reserving time of 5 minutes. The precooled organic chayote shoot was then stored at 8 ℃ for quality analysis. The results showed that vacuum cooling had no effect on the change of color, chlorophyll a, b and total chlorophyll. However, precooled organic chayote shoots showed better appearance than non-precooled vegetables. Vacuum cooling can reduce weight loss percentage. The amount of total soluble solids in organic chayote shoots increased with storage time. Precooled organic chayote shoot had longer shelf life of 8 days compared to normal storage life of 5 days.展开更多
针对车载自组织网络(Vehicular Ad Hoc Network,VANET)中的隐私保护问题,提出一种基于SM9算法的聚合签名方案。该方案以SM9签名算法为基础,结合聚合签名技术提高认证效率,利用雾计算降低时延,实现对数据的实时处理需求,同时满足条件隐...针对车载自组织网络(Vehicular Ad Hoc Network,VANET)中的隐私保护问题,提出一种基于SM9算法的聚合签名方案。该方案以SM9签名算法为基础,结合聚合签名技术提高认证效率,利用雾计算降低时延,实现对数据的实时处理需求,同时满足条件隐私保护、匿名性和不可链接性等安全需求。最后,通过假名机制保护车辆隐私,确保当车辆发生非法行为时能够快速追踪其真实身份。在随机谕言机模型下,证明了该方案的不可伪造性。性能分析结果表明,与现有方案相比,所提方案有效降低了聚合验证阶段的计算开销,适用于资源受限的车联网环境。展开更多
云存储为用户的数据管理带来了极大便捷,已成为数字经济的重要组成部分.然而,复杂多样的网络环境和不完全可信的第三方对用户隐私造成极大威胁.为保护用户隐私,通常先加密数据后存储,但传统加密技术生成的密文阻碍了后续数据检索.公钥...云存储为用户的数据管理带来了极大便捷,已成为数字经济的重要组成部分.然而,复杂多样的网络环境和不完全可信的第三方对用户隐私造成极大威胁.为保护用户隐私,通常先加密数据后存储,但传统加密技术生成的密文阻碍了后续数据检索.公钥可搜索加密(public-key encryption with keyword search,PEKS)技术在保障数据加密的同时,可提供保密检索功能,但由于常用关键词数量较少,传统PEKS方案易遭受关键词猜测攻击.公钥认证可搜索加密(public-key authenticated encryption with keyword search,PAEKS)在PEKS的基础上引入认证技术,可进一步提高安全性.然而,现有PAEKS方案大多基于国外密码算法设计,不符合我国密码技术自主创新的发展需求.基于国密SM9提出SM9-PAEKS方案,通过重新设计算法结构,将耗时运算转移至资源丰富的云端服务器,有效提升用户端检索效率.并在随机谕言模型下基于q-BDHI和Gap-q-BCAA1安全假设证明所提方案的安全性.最后理论分析和实验结果表明,与同类方案中通信代价最优的方案相比,SM9-PAEKS在仅增加96字节通信代价的情况下,总计算开销可至少降低约59.34%,其中关键词陷门生成的计算开销降低尤其显著,约为77.55%.有助于丰富国密算法的应用,同时可为云存储中数据加密与检索提供理论与技术支撑.展开更多
基金Supported by Innovative Research Project of Graduate Student of Southwest Minzu University(CX2017SZ089)
文摘[Objectives] The research aimed to identify Paris polyphylla with different growth year numbers and evaluate its resource quality.[Methods]Comparative research on P. polyphylla with different growth year numbers was conducted by using morphological identification and microscopic identification method. [Results] By contrasting original plant morphology,transverse sections of rhizome and fibrous root,powder,it displayed that microstructure of P. polyphylla had regularity difference in cell shape and size,duct quantity,trait and size,size and distribution of calcium oxalate cluster crystal. [Conclusions] The microstructure change of P. polyphylla was related to the number of its growth year,which could provide the reference for identifying the growth year number of P. polyphylla and evaluating its resource quality.
文摘The effect of vacuum cooling on shelf life of organic chayote was investigated. Vacuum cooling processes of organic chayote shoot packed in perforated polyethylene package using different vacuum pressure reserving operation modes were experimented. The holding final pressures for vacuum-cooled organic cilantro packed in holed polyethylene bags were set at two different levels, namely at 10 and 11 millibar. The pressures were experimented with 3 levels of reserving time of 3, 4 and 5 minutes. The weight loss percentage of chayote shoot during precooling to the temperature of 8 ~ 1 ~C using reserving pressure of 10 milibars for 3, 4, and 5 minutes were 0.5, 0.7, and 0.9, respectively. For the weight loss percentage during precooling using reserving pressure of 11 milibars for 3, 4, and 5 minutes were 0.4, 0.5, and 0.5, respectively. The optimum parameter for vacuum cooling process of organic chayote shoot at the initial temperature of 19-23 ℃to 8 ±1 ℃was the reserving pressure of 11 mbar with reserving time of 5 minutes. The precooled organic chayote shoot was then stored at 8 ℃ for quality analysis. The results showed that vacuum cooling had no effect on the change of color, chlorophyll a, b and total chlorophyll. However, precooled organic chayote shoots showed better appearance than non-precooled vegetables. Vacuum cooling can reduce weight loss percentage. The amount of total soluble solids in organic chayote shoots increased with storage time. Precooled organic chayote shoot had longer shelf life of 8 days compared to normal storage life of 5 days.
文摘针对车载自组织网络(Vehicular Ad Hoc Network,VANET)中的隐私保护问题,提出一种基于SM9算法的聚合签名方案。该方案以SM9签名算法为基础,结合聚合签名技术提高认证效率,利用雾计算降低时延,实现对数据的实时处理需求,同时满足条件隐私保护、匿名性和不可链接性等安全需求。最后,通过假名机制保护车辆隐私,确保当车辆发生非法行为时能够快速追踪其真实身份。在随机谕言机模型下,证明了该方案的不可伪造性。性能分析结果表明,与现有方案相比,所提方案有效降低了聚合验证阶段的计算开销,适用于资源受限的车联网环境。
文摘云存储为用户的数据管理带来了极大便捷,已成为数字经济的重要组成部分.然而,复杂多样的网络环境和不完全可信的第三方对用户隐私造成极大威胁.为保护用户隐私,通常先加密数据后存储,但传统加密技术生成的密文阻碍了后续数据检索.公钥可搜索加密(public-key encryption with keyword search,PEKS)技术在保障数据加密的同时,可提供保密检索功能,但由于常用关键词数量较少,传统PEKS方案易遭受关键词猜测攻击.公钥认证可搜索加密(public-key authenticated encryption with keyword search,PAEKS)在PEKS的基础上引入认证技术,可进一步提高安全性.然而,现有PAEKS方案大多基于国外密码算法设计,不符合我国密码技术自主创新的发展需求.基于国密SM9提出SM9-PAEKS方案,通过重新设计算法结构,将耗时运算转移至资源丰富的云端服务器,有效提升用户端检索效率.并在随机谕言模型下基于q-BDHI和Gap-q-BCAA1安全假设证明所提方案的安全性.最后理论分析和实验结果表明,与同类方案中通信代价最优的方案相比,SM9-PAEKS在仅增加96字节通信代价的情况下,总计算开销可至少降低约59.34%,其中关键词陷门生成的计算开销降低尤其显著,约为77.55%.有助于丰富国密算法的应用,同时可为云存储中数据加密与检索提供理论与技术支撑.
