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Determination of transition matrices for inhomogeneous dielectric bodies by a wave propagator method

A method for determining transition matrices for inhomogeneous dielectric shells is presented. The source can be either inside or outside the shell. The method is based upon expansions of the electric and magnetic fields in vector spherical harmonics. The expansion coefficients in the shell satisfy a system of linear ordinary differential equations in the radial direction. The expansion coefficien

Interpreters, translators and travelling agents: the role of tongshi in Sino-Tibetan relations

This paper examines the development of the role of a certain group of semi-officials, known as tongshi in Chinese, in Sino-Tibetan relations from the late-fourteenth century to the end of the eighteenth century, i.e. during the Ming and Qing dynasties, with particular reference to the part played by tongshi in events along the pre-modern Sino-Tibetan border. Tongshi were often Tibetans in Chinese