斜长石双晶的鉴定—讨论

《辽西中生代火山岩斜长石双晶类型、分布及其岩石成因信息》一文包含有大量有趣的资料,其中的一些结论也值得引起人们的重视。遣憾的是它提出的鉴定斜长石双晶的方法不够确切,故以此短文作为补充。该文中认为,当 An<70时,相对于结合面的延性符号者为负延性,则该结合面为(010)。此结论并不确切。当 An<70时,(010)结合面的延性符号确实为负。但其逆定理并不成立,即并非所有延性符号为负的结合面都为(010)面。例如当切面垂直[010]对,此时 Nm 接近 c 的方向,Np 接近 a 的方向,这样(001)结合面的延性符号也为负。     

关于磁测资料处理的几点意见

地矿部物化探局于八四年十月十五日至九月十四日在北京办了磁测资料处理讲习班。参加讲习班的同志们对磁测处理成果,方法进行了交流,并展开了专题讨论;还聘请了五位老师对一些新的方法技术作了专题讲座。现将交流,讨论的概况摘记如下:     

A STUDY ON THE MECHANISM AND CHARACTEROF THE INDUSTRIALAND SPATIAL TRANSFERENCE OF FDI IN CHINA

1 BACKGROUND OF STUDYChina has begun to take part in the great practice ofinternational competition and opening-up in the last 1 /5 time of 20th century. In the last two decades, Chinahas become one of the areas that have the greatest potential in industrial production, thus it has rankedsecond only to USA in the flow of international capital.By the end of 1998, the real value of FDI China hasutilized has added up to $268. I billion. China has wonworld attention as a huge market for …     

A Possible Origin of 6.7 GHz Linear Methanol Maser Sources

LETTERS1 INTRODUCTIONNew1y formed massive stars are obscured by dust, and their clearest signature is oftenat radio frequencies from strong maser emission. Methanol maser emission arises from severaItransitions, the strongest being the 5o -- 61A line at 6.7 GHz, which is also the second strongestGalactic masers of any molecule, first reported by Meaten (1991) and recognized as typical ofClass II masers. CIass II methanol masers are always found in regions of receat massive starfOr…     

LOCAL GOVERNMENT,ENTERPRISES AND INDIVIDUALS:ECONOMIC TRANSFORMATION IN THE PEARL RIVER DELTA—A Case Study in Beijiao Township,Shunde City

１ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｒｅｍａｒｋａｂｌｅｓｏｃｉａｌａｎｄｅｃｏｎｏｍｉｃｃｈａｎｇｅｉｎｔｈｅＰｅａｒｌＲｉｖｅｒＺｈｕｊｉａｎｇＤｅｌｔａＰＲＤｓｉｎｃｅｔｈｅｌａｔｅ１９７０ｓｈａｓｍａｄｅｉｔａｆｏｃａｌｐｏｉｎｔｉｎｒｅｆｏｒｍｅｒａａｃａｄｅｍｉｃｃｉｒｃｌｅｓ．ＭａｎｙｓｔｕｄｉｅｓｈａｖｅｂｅｅｎｄｏｎｅｏｎｔｈｅＰＲＤｉｔｓｒｅｇｉｏｎａｌｅｃｏｎｏｍｉｃｄｅｖｅｌｏｐｍｅｎｔａｎｄｒｅｓｔｒｕｃｔｕｒｉｎｇＬＩＮ１９９７ＬＩＮｅｔａｌ．１９９５…     

COMPARATIVE STUDY ON RESIDENTS′ PERCEPTION OF TOURISM IMPACT AT TOURIST PLACES——A Case Study of Xidi, Zhouzhuang and Jiuhua Mountain

1INTRODUCTIONRegional impact of tourism has been a basic content oftourism geographical research (BAO and CHU, 1999).A large number of studies have shown that the develop-ment of tourism industry based on service has profoundpositiveandnegative impacts on…     

COUPLING ANALYSES OF FRAGILE ECO-ENVIRONMENT IN THE WEST OF THE SONGNEN PLAIN

１ＩＮＴＲＯＤＵＣＴＩＯＮＩｎｅｃｏｓｙｓｔｅｍｆｒａｇｉｌｅｅｃｏｅｎｖｉｒｏｎｍｅｎｔｉｓｄｅｆｉｎｅｄａｓｔｈｅ“ｉｎｔｅｒｆａｃｅ＂ｂｅｔｗｅｅｎｔｗｏｏｒｍｏｒｅｓｙｓｔｅｍｓｏｆｍａｔｔｅｒｅｎｅｒｇｙｓｔｒｕｃｔｕｒｅｏｒｆｕｎｃｔｉｏｎａｎｄｔｈｅｔｒａｎｓｉｔｉｏｎｒｅｇｉｏｎｅｘｔｅｎｄｉｎｇｆｒｏｍｔｈｉｓｉｎｔｅｒｆａｃｅＮＩＵ１９８９．ＴｈｅｆｒａｇｉｌｅｅｃｏｅｎｖｉｒｏｎｍｅｎｔｏｆｔｈｅＳｏｎｇｎｅｎＰｌａｉｎｉｓｓｉｔｕ-ａｔｅｄｏｎｓｕｃｈ…     

致密射电源内的相对论运动效应

在本文中,我们对致密射电源内相对论运动效应的研究进展加以评述。内容包括: (1)视超光运动; (2)视超光流量变化(射电变源和康普顿问题); (3)射电变源的X-射线发射; (4)类星体计数统计中的相对论束射效应; (5)致密射电源物理参数的相对论改正; (6)相对论喷流的辐射特性; (7)相对论膨胀的流体力学研究及其应用。     

风沙地貌形成机制的几个问题

本文以新月形沙丘为例,分析了风沙运动物理过程,说明风沙地貌的发生和发展情况。作者认为,风沙有自动聚集成堆的收敛性,而沙粒一旦成堆,下层的沙粒将受到保护成为不可动粒子。另一方面,沙粒成堆后运动将变慢,上风的风沙流不断补充,致使沙堆逐渐增大而发育为典型的风沙地貌。     

清洗打印头方法

计算机打印时出现划纸、字迹短笔划、断针等现象时 ,用如下方法清洗打印头效果较好。取一个干净的小盘子 ,倒入少量纯净酒精 ,取下打印头 ,把前部浸入酒精 (注意不要把电缆浸湿 )约1 0 min取出。装在打印机上 ,启动自检或打印一部分文字。这时打印机打印头前端喷出蓝黑色污物 ,其中有碎纸屑与油污形成的粘性颗粒 ,就是这些污物堵住打印头针孔出现故障。再换些干净酒精重复洗两次 ,打印机就可打出清晰的文字清洗打印头方法@成军生