A more general model describing PCM close-contact melting outside a hot sphere is devel0ped withthe aid of introducing a parameter a and presenting a supplementary equation for the first time in thispaper. The governi...A more general model describing PCM close-contact melting outside a hot sphere is devel0ped withthe aid of introducing a parameter a and presenting a supplementary equation for the first time in thispaper. The governing integral-differential equations are solved by numerical method. The melt-filmthickness variation along the surface of sphere is obtained reasonably due to the consideration of theinterface shape more precisely. The calculation results of Peclet number, heat transferred and pressuredistribution are also compared with that in literature. The model presented in this paper can describethe whole close-contact region and the whole contact melting process. Closeeontact melting in spher-ical or cylindrical capsules to which the model can be extended is also discussed brielly.展开更多
A mathematical model describing the close-contact melting process of phase change material in a spherical enclosure is developed. The governing integro-differential equations are solved by the numerical integral techn...A mathematical model describing the close-contact melting process of phase change material in a spherical enclosure is developed. The governing integro-differential equations are solved by the numerical integral technique. By considering the two-phase interface shape more precisely, the variation of the melt-film thickness profile with time is obtained. The calculated descending velocities of phase change solid are confirmed by the available experimental data. It is shown that the proposed model can cover the whole range of close-contact melting.展开更多
随着万物互联和大数据时代的到来,通过线下交互数据追踪传染病患者的密切接触者,利用健康数据对密切接触者的健康状态进行持续监测,为传染病人际传播分析带来了新的研究视角,为阻断传染病的传播提供了新的处理方式。然而,此类方法也存...随着万物互联和大数据时代的到来,通过线下交互数据追踪传染病患者的密切接触者,利用健康数据对密切接触者的健康状态进行持续监测,为传染病人际传播分析带来了新的研究视角,为阻断传染病的传播提供了新的处理方式。然而,此类方法也存在较为严重的隐私泄露问题。为此,文章设计了基于线下交互和健康数据的传染病人际传播分析模型(Analysis Model of Human-to-Human Transmission of Infectious Diseases Based on Offline Interaction and Health Data,AMHHTID-OIHD)。该模型由可信机构、健康云服务器、交互云服务器、疾控中心、医院和用户6种实体组成,在支持隐私保护的同时实现CDC查找该患者的密切接触者并对其进行健康状态分类。文章以KNN分类和高斯朴素贝叶斯分类为基础,结合同态加密技术,设计了支持AMHHTID-OIHD的隐私保护密切接触者查找算法和隐私保护健康状态分类算法。最后,对该模型的安全性进行分析,结果表明该模型可以在保护隐私的情况下实现密切接触者查找和健康状态分类。展开更多
文摘A more general model describing PCM close-contact melting outside a hot sphere is devel0ped withthe aid of introducing a parameter a and presenting a supplementary equation for the first time in thispaper. The governing integral-differential equations are solved by numerical method. The melt-filmthickness variation along the surface of sphere is obtained reasonably due to the consideration of theinterface shape more precisely. The calculation results of Peclet number, heat transferred and pressuredistribution are also compared with that in literature. The model presented in this paper can describethe whole close-contact region and the whole contact melting process. Closeeontact melting in spher-ical or cylindrical capsules to which the model can be extended is also discussed brielly.
文摘A mathematical model describing the close-contact melting process of phase change material in a spherical enclosure is developed. The governing integro-differential equations are solved by the numerical integral technique. By considering the two-phase interface shape more precisely, the variation of the melt-film thickness profile with time is obtained. The calculated descending velocities of phase change solid are confirmed by the available experimental data. It is shown that the proposed model can cover the whole range of close-contact melting.
文摘随着万物互联和大数据时代的到来,通过线下交互数据追踪传染病患者的密切接触者,利用健康数据对密切接触者的健康状态进行持续监测,为传染病人际传播分析带来了新的研究视角,为阻断传染病的传播提供了新的处理方式。然而,此类方法也存在较为严重的隐私泄露问题。为此,文章设计了基于线下交互和健康数据的传染病人际传播分析模型(Analysis Model of Human-to-Human Transmission of Infectious Diseases Based on Offline Interaction and Health Data,AMHHTID-OIHD)。该模型由可信机构、健康云服务器、交互云服务器、疾控中心、医院和用户6种实体组成,在支持隐私保护的同时实现CDC查找该患者的密切接触者并对其进行健康状态分类。文章以KNN分类和高斯朴素贝叶斯分类为基础,结合同态加密技术,设计了支持AMHHTID-OIHD的隐私保护密切接触者查找算法和隐私保护健康状态分类算法。最后,对该模型的安全性进行分析,结果表明该模型可以在保护隐私的情况下实现密切接触者查找和健康状态分类。
