Investigations in the U.S.S.R. of non-linear phenomena in the ionosphere

Investigations of non-linear ionospheric phenomena in the U.S.S.R. are reviewed. The facilities available and some non-linear phenomena first observed with these facilities are described. Among these are strong heating and non-linear absorption in lower parts of the ionosphere, self-modulation caused by intense Langmuir oscillations, the modulation of the auroral electrojet at VLF, stimulated ionization in the F-region, self-focusing effects at oblique incidence as well as many theoretical investigations of non-linear phenomena.     

从二十四顷地教案日期的分歧看教会史料的局限

在内蒙古二十四顷地教案中比利时圣母圣心会韩默理主教被杀,这是长城以北义和团运动中震惊中外的大案。由于西方史家尚未充分利用中文档案,致使西文著作的许多事实与中文史料不符。本文考辨案发日期,认为在是１９００年７月１９日,而非教会传统的说法７月２０日,并进一步认为双方若能跳出各自民族、宗教和政党的狭隘圈子,不仅有助于澄清一些历史悬案和争端,也能更好地在历史研究领域等各个方面进行交流合作。     

Laying the Foundation of U.S. Power in the Pacific

Book reviewed in this article:
David M. Pletcher, The Diplomacy of Involvement: American Economic Expansion across the Pacific, 1784–1900     

科默·V·伍德沃德与美国南部史学

科默·V.伍德沃德在美国是享有盛誉的南部史专家,同时也是一位非常活跃的社会活动家。在长期的学术实践中他形成了注重史学的社会功能、强调历史发展的非连续性和善用反讽的史学研究风格。他以自己对美国南部历史与现实的深切关怀,积极推动了南部史的研究。其贡献既表现在对新的史学领域和问题的开拓,也体现在围绕他的著述所展开的学术商榷、学术批评中,以及由此而形成的良性的学术研究氛围上。