第三个吻痕 - 何水水

As it is well known, the Minkowski vacuum appears thermally populated to a quantum mechanical detector on a uniformly accelerating course. We investigate how this thermal radiation may contribute to the classical nature of the detector's trajectory through the criteria of decoherence. An uncertainty-type relation is obtained for the detector involving the fluctuation in temperature, the time of flight and the coupling to the bath.

城市的进步离不开市政工程的支持，各类市政建设为人们的日常生活提供了保障。地下排水系统能够高效地处理污水，是改善城市环境的重要环节。我国城市的居民用水需求较大，污水排放量随之增加，同时，一些城市在暴雨天气下，排水系统常常出现严重堵塞，因此要通过全面的解决方案，才能确保城市的正常运转。

We present an exact field theoretical representation of the statistical mechanics of simple classical liquids with short-ranged pairwise additive interactions. The action of the field theory is obtained by performing a Hubbard-Stratonovich transformation of the configurational Boltzmann factor. The mean field and Gaussian approximations of the theory are derived and applications to the liquid-vapour transition considered.

本出版物为各国政府，特别是发展中国家政府，以及主管部门、船东、港口国监督机构、环保部门和其它利益相关方在批准、实施和执行《压载水管理公约》的重要意义方面提供实用信息。手册旨在鼓励更多国家批准并正确实施和执行公约。但须注意，就法律而言，应始终查阅公约正式文本。