凉州番禾县瑞像故事及造型

本文就番禾县瑞像的由来、发展及其不同时期的表现形式进行了分类探讨并就瑞像的定义提出了新的看法。     

Reproduction rates in multiregion modeling systems for HIV / AIDS

The persistence of HIV/AIDS has seen a revival of academic interest in the development of modeling systems to assist understanding the population dynamics of this infection. Moreover, it has become increasingly recognized that a key component of these systems for interpreting disease prevention is their reproduction rate, which provides an indication of whether an epidemic might start in a community described by a particular set of epidemiological characteristics. The properties of these rates have been explored in detail for models of a single risk behavior but not for multiregion formats that allow for the transfer of infection between geographical units. Therefore, in this paper I derive reproduction rates for a multiregion HIV/AIDS model together with their associated critical thresholds that estimate the minimum population of susceptibles necessary for an epidemic to begin. These statistics are interpreted for a simplified global setting representing regional variations in the potential onset of HIV/AIDS. In the discussion I examine the potential applicability of these results to understanding HIV/AIDS prevention.     

Prelude to the plague: public health and politics at America's Pacific gateway, 1899

San Francisco played a crucial in the formulation of American immigration policy vis-à-vis Asia in the late nineteenth and early twentieth centuries. During this period, it was often difficult to differentiate political struggles over the exclusion of Asians from other conflicts. This article examines one such arena: an acrimonious, well-documented argument in 1899 between Federal and various State and local authorities over the arrival of a Japanese passenger liner that may--or may not--have been carrying bubonic plague. Six months later, the plague unquestionably arrived, resulting in the well-known San Francisco plague epidemic of 1900 in which more that 110 people died. Reviewing the 1899 prelude, the public attitudes of the various health authorities, and the way the press reported health issues, collectively give some sense of that historical space where the regulation of public health, politics, and the immigration industry intersected and were fiercely contested.