小小天文爱好者

济南市营市东街小学属于该区重点小学,1999年,我们班在班主任的组织下,成立了“天文观测小组”,我任组长,同时还专门聘请了济南著名的“天文老人”——张仲彬做校外辅导员。     

LUCC and Accompanied Soil Degradation in China from 1960''''s to 1990''''s

1ＩｎｔｒｏｄｕｃｔｉｏｎＬａｎｄｕｓｅａｎｄｃｏｖｅｒｃｈａｎｇｅｓ (ＬＵＣＣ)ａｎｄａｃｃｏｍｐａ ｎｉｅｄｅｎｖｉｒｏｎｍｅｎｔａｌｃｈａｎｇｅｓｓｕｃｈａｓｓｏｉｌｄｅｇｒａｄａｔｉｏｎｂｅ ｃａｍｅｍｏｒｅａｎｄｍｏｒｅｓｅｒｉｏｕｓｉｎｒｅｃｅｎｔｄｅｃａｄｅｓ .Ｔｈｅｒｅ ｆｏｒｅｍａｎｙｒｅｓｅａｒｃｈｅｓｉｎＣｈｉｎａａｎｄａｂｒｏａｄａｒｅｅｎｇａｇｅｄｉｎＬＵＣＣａｎｄｓｏｉｌｄｅｇｒａｄａｔｉｏｎｓｔｕｄｙ ,ｓｕｃｈａｓＷｕＣｈｕａｎ ｊｕｎ,ｅｔｃ .(1994 ) ,ＦｅｎｇＺｈｉｍｉ…     

Relationship between the Pre-existing Active Kunlun Fault and Co-seismic Surface Ruptures Produced by the 2001 Mw 7．8 Central Kunlun Earthquake，China

Field investigations allow to constrain the co-seismic surface rupture zone of ～400km with a strike-slip up to 16．3 m associated with the 2001Mw 7．8 Central Kunlun earthquake that occurred along the western segment of the Kunlun fault,northern Tibet．The co-seismic rupture structures are almost duplicated on the pre-existing fault traces of the Kunlun fault．The deformational characteristics of the co-seismic surface ruptures reveal that the earthquake had a nearly pure strike-slip mechanism．Theg eologic and topographice vidence clearly shows that spatial distributions of the co-seismic surface ruptures are re-stricted by the pre-existing geological structures of the Kunlun fault．     

-89G634.41H130;F085;17;46;F;H;F085_17;H130

试评价是英语新课程的重要组成部分,是实现新课程标准的重要保证。作为评价的试卷应该难度适中,充分体现教育、教学目标,并能对教学产生最大的正面导向作用,从而真正体现受测试者的英语水平和能力,准确反映教学情况和教学效果。在此问题上,命题者要从命题的方向、内容、原则与方法等几个方面去研究和把握。0山东师范大学外国语学院学报(基础英语教育)Journal of Basic English Education94-97G634.41H130;F085;17;46;F;H;     

Mineralogical characteristics of airborne particles collected in Beijing during a severe Asian dust storm period in spring 2002

Asian dust storm (ADS) samples were collected on March 20,2002 in Beijing,China. High-resolution field emission scanning electron microscopy with energy dispersive X-ray detector (FESEM-EDX) and X-ray diffraction (XRD) were used to study the morphology,chemical compositions,number-size dis-tributions and mineralogical compositions of ADS particles. The mineral particles were major compo-nents in the ADS samples,accounting for 94% by number. The XRD analysis indicated that the dust particles were dominated by clay (40.3%),and quartz (19.5%),followed by plagioclase (8.4%),calcite (7.5%),K-feldspar (1.5%),hematite (0.9%),pyrite (0.9%),hornblende (0.4%) and gypsum (0.3%),with a certain amount of noncrystalline materials (20.3%). Clay minerals were mainly illite/smectite mixed lay-ers (78%),followed by illite (9%),kaolinite (6%),and chlorite (7%). In addition to these main minerals,FESEM-EDX also detected some trace minerals,such as dolomite,pyrite,thenardite,as well as heavy minerals represented by rutile,ilmenite and apatite. The mineralogical compositions of the 2002-03-20 Asian dust storm and the Saharan dust plumes were similar but the clay mineralogy showed a great distinction,with the illite/smectite mixed layers being common in the Asian dust storm but illite being common in the Saharan dust plumes.     

THE DICHOTOMY OF ACTUAL TORRENT CATCHMENTS: IS THERE AN ALPINE DISEASE?

1 INTRODUCTIONDuring the last glaciation all large valleys along the northem tringe of the Bavarian Alps wereintensively influenced by the movement of huge glacial lobes into the forelands. During the glacialadvance of the combined Isar and Loisach glaciers in the Lainbach test basin, sitUated 6() kIn south ofMunich, the eastom rim of the geomorphological basin of Kochel was covered by a small secondare icelobe. In the KOchel basin the IsarLosach glacier developed to a maximum thickn…     

Grade-Tonnage, Ore Value-Tonnage, and Enrichment Ratio-Tonnage Models for Resource Assessment

I' Grade-tonnage diagrams are one of the most useful tools inthe resource assessment (e. g. St'nger, 1993). One' grade-tonnage diagram is well known as Laskys (1950) e\-7ation, whichdemonstrates the linear relation between average grade (x) andlOgarithms of cumulative ore tonnage (ac above a given gradex(0相似文献