WINTER RUNOFF AND EROSION ON NORTHWESTERN USA CROPLAND

h200l.llNTRODUCTI0NTheNorthwesternWheatandRangeRegi0n(NWax)(Austin,l98l),whichincludesportionsofIdaho,Oregon,andWashington,isoneofthem0stuniqueagriculturalregionsoftheUSA.Winterandspringsmallgrainsand0thercropsareproukcedonl0esss0ilsdepositedoverbasalt.TheloessvariesinboththicknessandtopograPhicfeatures.Someareashavesteepanddune-likeslopes,while0thershavel0ng,gentlesl0pes.Theregion,br0kenfromnativeprairielessthanl20yearsag0(Kaise,l96l)hassufferedseriousdegradationofthesoilresourcebyw…     

Variation of shearwave splitting in earthquake clusters with very similar waveforms

IntroductionAfter the confirming of anisotropy theory and the shear wave splitting, Crampin suggested that the accumulation and release of stress before and after a large earthquake could be observed by investigating the behavior of shear-wave (Crampin, et al, 1984; Crampin, 1987). Since that time, seismologists tried to find evidence to prove the hypothesis. Peacock, et al (1988) and Crampin, et al (1990) declared that they find a variation of time delay before and after the North Palm Spr…     

波形极相似的地震丛集中剪切波分裂的变化

在1991年大同MS5.8地震余震的记录中,一些小地震丛集中可见波形极为相似的地震对,利用各对地震记录的互相关函数可以确认其相似性．为了辨认剪切波波形中发生的微小变化,采用重采样技术提高采样率．可以直接从地震图中观察到丛集中成对地震的剪切波分裂的变化．      

哈萨克斯坦的地震区划

General Seismic Zoning Map of the USSR(GSZ-78),included in the Building Code,in spite of relative improvement in comparison with previous ones(1937,1957,1968),is characterized by significant reduction of seismic hazard.In some regions strong earthquakes exceeding the predicted intensity occurred almost every year.Such cases in Kazakhstan are the earthquakes of Bakanasskoye(1979,M=14,I=6～7)and Zaysanskoye (1990,M=7.0,K=16,I=8).Besides,there are territories that are platforms in tectonic aspect,but which have been undergone activization at neotectonic evolution stage (Mangishlak,Ariskum desert near the Aral sea).Their potential seismic hazards are not estimated in General Seismic Zoning Map(GSZ-78).Mentioned circumstances induce the necessity to compile new seismic zoning map.     

医学图像三维表面模型重建

三维表面模型重建是医学图像处理的重要内容,是将CT和MRI等医疗影像设备获得的二维图像重建成三维立体表面显示图像的过程.本文重点研究了其重建算法的具体实现:(1)在建模上采用了基于体素的三维物体体积重建;(2)在显示上提出了基于Ray-Casting的三维物体二维直接显示技术.所以,和传统采用三角面拟合的方法相比,具有图像重建过程无需生成中间数据、无需进行3D物体的边界检测等优点,同时该算法并行性好,易于采用硬件方法实现加速.因此,本研究为医学图像三维表面模型重建应用软件的开发打下了理论基础.     

CROSS-SECTIONS OF THE WESTERN HIMALAYAN FOOTHILLS:PROBLEMS IN RESTORATION AND IMPLICATIONS FOR CRUSTAL SHORTENING

CROSS-SECTIONS OF THE WESTERN HIMALAYAN FOOTHILLS:PROBLEMS IN RESTORATION AND IMPLICATIONS FOR CRUSTAL SHORTENING1　PowersPM ,LillieRJ ,YeatsRS .StructureandshorteningoftheKangraandDehraDunreentrants ,Sub Himalaya ,India[J].GSABulletin ,1998,110 :10 10～ 10 2 7.…     

YARLUNG ZANGBO OPHIOLITES,SOUTHERN TIBET REVISITED

YARLUNG ZANGBO OPHIOLITES,SOUTHERN TIBET REVISITED     

Palaeoshorelines as Indic ator of Late Cenozoic Climo-Tectonic Changes in Ladakh Trans Himalaya: an Illustration From Tso Kar Lake

PALAEOSHORELINES AS INDICATOR OF LATE CENOZOIC CLIMO-TECTONIC CHANGES IN LADAKH TRANS HIMALAYA:AN ILLUSTRATION FROM TSO KAR LAKE1　BhattacharyyaA .Vegetationandclimateduringthelast 30 0 0 0 yearsinLadakh [J] .Palaeogeogr,Palaeoclimatol,Palaeoecol,1989,73:2 5～ 38. 2　CerlingTE .LateCenozoicvegetationchange,atmosphericCO2 andtectonics[A] .Ruddiman ,W .F .,ed .Tectonicupliftandclimatechange[M] .NewYork:PlenumPress,1998.313～ 2 2 7. …     

正断层断距纵剖面图及其运动学:概念模型与地质实例

断距纵剖面图 （T H图）是指以断层的垂直断距为横轴、以地层或地质年龄为纵轴所绘制的随地层或地质年龄所变化的断距分布图。断距纵剖面图为确定正断层类型、断层形成时间和断层的纵向演化史提供了一个简单迅捷的工具。概念模型表明,断距纵剖面图可以明确无误地区分出简单后沉积型正断层、后沉积拱顶拉张型正断层、同沉积生长型正断层及其复合型正断层。简单后沉积型正断层的断距不随地层年龄的变化而变化, 其断距纵剖面图为一垂直线段。后沉积拱顶拉张型正断层的断距随地层年龄的增大而减小并趋向零值,同沉积生长型正断层的断距随地层年龄的增大而增大,复合型正断层则具其组合型断距纵剖面形态。除简单后沉积型正断层外,断距纵剖面图中的最大断距点代表了该断层的起始形成年代。     

Deposition of nanoparticles on school eyeglasses in urban and rural areas:A methodology for a more real assessment of the possible impacts

Because incomplete confirmation is available concerning the influential role of atmosphere contamination on conjunctivitis,myopia,asthma,and allergic rhinitis in Brazil,the focus of the present work is to explore the possible relations among atmosphere contamination and eye problems.Rather that a case study on eye diseases,by way of questionnaires supplemented by the investigation of nanoparticles(NPs)on eyeglasses,the study examines the mechanisms in which NPs and ultra-fine particles are deposited on the glasses of children up to 10 years of age in urban and rural area.The important connection between atmosphere contaminants and individual protection equipment justifies improving indoor school properties in order could protect children’s eyes,particularly in high-pollution/high-particulate areas.