INVESTIGATION ON THE BRAZIL TWIN APPEARING ON -X PLANE OF SYNTHETIC QUARTZ AND ITS FORMATION RULES

So far a great deal of systematic studies have been made on twins of natural quartz crystals, but comparatively few on those of synthetic quartz crystals. What is more, no report on the Brazil twin appeared on -X plane of synthetic quartz has ever been published. The Brazil twin is known to deteriorate both optical and electrical properties of quartz crystals, it is therefore certainly of practical significance to

风云多变的海地

9月29日深夜,加勒比岛国海地发生军事政变。首都太子港东郊装甲营的一批士兵在阿利克斯·席尔瓦上校率领下,向总统官邸和总统府国民宫发动进攻。尽管法国人组成的总统私人卫队进行了抵抗,但是总统府在30日上午失守,让—贝特朗·阿里斯蒂德总统被俘,并被押往武装部队参谋部。