The macroporous anion exchangers with long-chained cross-linking agents were investigated for the tungsten recovery from salt solutions. The physical-chemical characteristics of these sorbents were studied by means o...The macroporous anion exchangers with long-chained cross-linking agents were investigated for the tungsten recovery from salt solutions. The physical-chemical characteristics of these sorbents were studied by means of sorption-desorption experiment aswell as electron and IR-spectroscopy. The anion exchangers on the basis of macroporous copolymers of methylacrylate and divinyl-ester of diethyleneglycol or tetravinyl-ester of pentaerythritol possess the exchange capacity to tungsten 2--5 times greater than the porous anion exchangers on the basis of styrene and divinylbenzene, therefore they can be used for selective tungsten recovery from comulex salt solutions.展开更多
为了抵御身份伪造攻击和解决认证效率低的问题,提出了一种基于主从链的跨域身份认证算法(Cross-domain identity Authentication algorithm based on the Master-Slave chain,CAMS)。该算法基于区块链技术利用主从链方式实现了车辆数据...为了抵御身份伪造攻击和解决认证效率低的问题,提出了一种基于主从链的跨域身份认证算法(Cross-domain identity Authentication algorithm based on the Master-Slave chain,CAMS)。该算法基于区块链技术利用主从链方式实现了车辆数据的跨域存储和共享,从而提高了跨域身份认证效率。此外,CAMS算法在跨域认证过程中引入了假名的生成和验证参数。在验证消息之前,进一步验证车辆身份,确保认证身份的匿名性,抵御身份伪造攻击。仿真结果表明,CAMS在计算开销和认证效率方面具有较好的性能。展开更多
文摘The macroporous anion exchangers with long-chained cross-linking agents were investigated for the tungsten recovery from salt solutions. The physical-chemical characteristics of these sorbents were studied by means of sorption-desorption experiment aswell as electron and IR-spectroscopy. The anion exchangers on the basis of macroporous copolymers of methylacrylate and divinyl-ester of diethyleneglycol or tetravinyl-ester of pentaerythritol possess the exchange capacity to tungsten 2--5 times greater than the porous anion exchangers on the basis of styrene and divinylbenzene, therefore they can be used for selective tungsten recovery from comulex salt solutions.
文摘为了抵御身份伪造攻击和解决认证效率低的问题,提出了一种基于主从链的跨域身份认证算法(Cross-domain identity Authentication algorithm based on the Master-Slave chain,CAMS)。该算法基于区块链技术利用主从链方式实现了车辆数据的跨域存储和共享,从而提高了跨域身份认证效率。此外,CAMS算法在跨域认证过程中引入了假名的生成和验证参数。在验证消息之前,进一步验证车辆身份,确保认证身份的匿名性,抵御身份伪造攻击。仿真结果表明,CAMS在计算开销和认证效率方面具有较好的性能。