Experimental study of the plasma window

The plasma window is an advanced apparatus that can work as the interface between a vacuum and a high pressure region. It can be used in many applications that need atmosphere-vacuum interface, such as a gas target, electron beam welding, synchrotron radiation and a spallation neutron source. A test bench of the plasma window is constructed in Peking University. A series of experiments and the corresponding parameter measurements have been presented in this article. The experiment result indicates the feasibility of such a facility acting as an interface between a vacuum and a high pressure region.

窗内观竹:白居易诗歌的“窗竹”意象与文人画中的“无窗之窗”

白居易对“窗竹”意象的表现做出了极为重要的开拓,他将观察窗竹的视角,由侧重室外转向侧重室内。室内所独有的卧观竹形、卧听竹声、卧感竹风及竹阴等多种品赏方式,增添了窗外翠竹的韵味,也象征化地体现了窗纳万物的园林审美方式。白居易对室内视角审美内涵的丰富和开拓,对后世相关题材的诗歌和绘画均产生了一定的影响。文人画中隐去窗框、以暗含的室内视角表现窗外之竹的“无窗之窗”表现法,以及作为“无窗之窗”前提之一的“窗景如画”观,都与白居易的窗竹书写有密切的联系。