在人工智能技术快速发展的背景下,高校钓鱼邮件攻击呈现出智能化、隐蔽化的新特征,给高校信息安全带来严峻挑战。本文针对高校钓鱼邮件攻击手法多样、用户安全意识薄弱、防护措施单一等问题,提出了一种基于多层防护的钓鱼邮件防御体系...在人工智能技术快速发展的背景下,高校钓鱼邮件攻击呈现出智能化、隐蔽化的新特征,给高校信息安全带来严峻挑战。本文针对高校钓鱼邮件攻击手法多样、用户安全意识薄弱、防护措施单一等问题,提出了一种基于多层防护的钓鱼邮件防御体系。该体系从技术层、管理层、人员层三个维度构建防护机制,通过部署SPF/DKIM/D M ARC认证协议、邮件安全网关、智能检测系统,结合安全管理制度和人员培训演练,形成闭环防护体系。展开更多
This study reports the synthesis of oleic acid sterol ester with liquid crystalline properties and its enhanced stability and UV-blocking performance through microencapsulation.Oleic acid sterol ester was synthesized ...This study reports the synthesis of oleic acid sterol ester with liquid crystalline properties and its enhanced stability and UV-blocking performance through microencapsulation.Oleic acid sterol ester was synthesized via the esterification of phytosterol and oleic acid,whose structure was characterized using Fourier-transform infrared spectroscopy(FTIR)and mass spectrometry(MS).Its liquid crystalline behavior was confirmed via the polarized optical microscopy(POM),thermogravimetric analysis(TGA),differential scanning calorimetry(DSC),wide-angle X-ray scattering(WAXS),and small-angle X-ray scattering(SAXS).UV absorption tests were conducted to assess the UV-blocking performance of the oleic acid sterol ester liquid crystals.To improve the stability of its liquid crystalline structure,the oleic acid sterol ester was encapsulated into microcapsules through the emulsion polymerization.SPF measurements were performed on the sunscreen formulations containing liquid crystal microcapsules.The oleic acid sterol ester displayed cholesteric liquid crystalline behavior and strong UVA absorption,which indicates its suitability as a natural UV absorber.Microencapsulation further enhanced its stability and UV-blocking properties.SPF testing showed that the formulations with microcapsules achieved an SPF value of 7.01,which surpasses the nano titanium dioxide(SPF=6.23)and significantly outperform the unencapsulated liquid crystal formulations(SPF=2.65).This study highlights the potential of microencapsulated oleic acid sterol ester as a novel UV absorber in the sunscreen formulations,offers the enhanced stability and effective UV protection,and showcases its application potential in the innovative cosmetic products.展开更多
文摘在人工智能技术快速发展的背景下,高校钓鱼邮件攻击呈现出智能化、隐蔽化的新特征,给高校信息安全带来严峻挑战。本文针对高校钓鱼邮件攻击手法多样、用户安全意识薄弱、防护措施单一等问题,提出了一种基于多层防护的钓鱼邮件防御体系。该体系从技术层、管理层、人员层三个维度构建防护机制,通过部署SPF/DKIM/D M ARC认证协议、邮件安全网关、智能检测系统,结合安全管理制度和人员培训演练,形成闭环防护体系。
文摘This study reports the synthesis of oleic acid sterol ester with liquid crystalline properties and its enhanced stability and UV-blocking performance through microencapsulation.Oleic acid sterol ester was synthesized via the esterification of phytosterol and oleic acid,whose structure was characterized using Fourier-transform infrared spectroscopy(FTIR)and mass spectrometry(MS).Its liquid crystalline behavior was confirmed via the polarized optical microscopy(POM),thermogravimetric analysis(TGA),differential scanning calorimetry(DSC),wide-angle X-ray scattering(WAXS),and small-angle X-ray scattering(SAXS).UV absorption tests were conducted to assess the UV-blocking performance of the oleic acid sterol ester liquid crystals.To improve the stability of its liquid crystalline structure,the oleic acid sterol ester was encapsulated into microcapsules through the emulsion polymerization.SPF measurements were performed on the sunscreen formulations containing liquid crystal microcapsules.The oleic acid sterol ester displayed cholesteric liquid crystalline behavior and strong UVA absorption,which indicates its suitability as a natural UV absorber.Microencapsulation further enhanced its stability and UV-blocking properties.SPF testing showed that the formulations with microcapsules achieved an SPF value of 7.01,which surpasses the nano titanium dioxide(SPF=6.23)and significantly outperform the unencapsulated liquid crystal formulations(SPF=2.65).This study highlights the potential of microencapsulated oleic acid sterol ester as a novel UV absorber in the sunscreen formulations,offers the enhanced stability and effective UV protection,and showcases its application potential in the innovative cosmetic products.
