3D Kinematics of Classical Cepheids According to Gaia EDR3 Catalog

The kinematics of about 2000 classical Cepheids of the Milky Way with data from Gaia EDR3 catalog has been studied.For some of these stars,there are line-of-sight velocities.On the basis of the nonlinear rotation model,the parameters of the rotation curve of the Galaxy were determined.The circular linear rotation velocity of the nearsolar neighborhood around the Galaxy center was V₀=236±3 km s^-1 for the assumed Sun’s galactocentric distance R₀=8.1±0.1 kpc.Analysi...     

Characteristic Study of the Boundary Layer Parameters over the Arabian Sea and the Bay of Bengal Using the QuikSCAT Dataset

The marine atmospheric boundary layer (MABL) plays a vital role in the transport of momentum and heat from the surface of the ocean into the atmosphere. A detailed study on the MABL characteristics was carried out using high-resolution surface-wind data as measured by the QuikSCAT (Quick scatterometer) satellite. Spatial variations in the surface wind, frictional velocity, roughness parameter and drag coefficient for the different seasons were studied. The surface wind was strong during the southwest monsoon season due to the modulation induced by the Low Level Jetstream. The drag coefficient was larger during this season, due to the strong winds and was lower during the winter months. The spatial variations in the frictional velocity over the seas was small during the post-monsoon season (～0.2 m s-1). The maximum spatial variation in the frictional velocity was found over the south Arabian Sea (0.3 to 0.5 m s-1) during the southwest monsoon period, followed by the pre-monsoon over the Bay of Bengal (0.1 to 0.25 m s-1). The mean wind-stress curl during the winter was positive over the equatorial region, with a maximum value of 1.5×10-7N m-3, but on either side of the equatorial belt, a negative wind-stress curl dominated. The area average of the frictional velocity and drag coefficient over the Arabian Sea and Bay of Bengal were also studied. The values of frictional velocity shows a variability that is similar to the intraseasonal oscillation (ISO) and this was confirmed via wavelet analysis. In the case of the drag coefficient, the prominent oscillations were ISO and quasi-biweekly mode (QBM). The interrelationship between the drag coefficient and the frictional velocity with wind speed in both the Arabian Sea and the Bay of Bengal was also studied.     

STUDY OF MORPHOLOGICAL CHANGE OF THE KUSHIYARA AND MONU RIVERS BY REMOTE SENSING

The Kushiyara and Monu rivers are two of the major river systems in the northeast region of Bangladesh. Analyzing satellite images of the Kushiyara and Monu rivers between 1990 and 1997, it was found that significant changes occurred at five distinct locations; i.e., Ahmadpur, Monumukh, Raysrr, Kaprangibari and Telibil. The amount of change was measured as 168.34 ha by using a plani-meter. Transportation of sediment was the major contributing factor of morphological change. The total average sediment concentration of Kushiyara and Monu rivers was found to be 16889.6 ppm per year during the study period by applying the Engelund and Hansen equation approach. Protection work has been suggested at the vulnerable locations.     

Attenuation characteristics of peak acceleration in North China and comparison with those in the eastern part of North America

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近场强地面运动的三维模拟：由破裂方向性推断盆地边缘效应

神户地震造成严重破坏的地区呈狭窄的带状分布是１９９５年兵县南部（神户）地震非常显著的特征。形成强地面运动放大的过程至今未见阐述。通过构造一个掩埋于靠近盆地的走滑断层的一个Ｍ＝７地震的动力学破裂过程,我们模拟了由破裂方向性产生的盆地边缘效应。通过三维有限差分法计算了频率达１Ｈｚ的速度的地面运动地震图。峰值地面速度曲线的状态显示,当断层与盆地边缘平行时,峰值地面运动在沿盆地边缘一个宽度在几公里范围的狭     

中国北方黄土高原地区黄土的微结构模型(详细摘要)

试样为取自中国北方黄土高原标准剖面①中的马兰（Ｑ３）、离石（Ｑ２）、午城（Ｑ１）以及次生的洪积冲积（Ｑ４）黄土．各方面成功的配合与多手段的综合性研究使我们能对黄土的微结构模型有了概念,能分析结构特征对黄土某些性质的影响,并可用来解释已提出的有关成因...     

The Characteristics of the X-ray Flares (1-8, GOES) of the Different Classes and Their Variations in Two Cycles of Solar Activity

1　ＩｎｔｒｏｄｕｃｔｉｏｎＳｏｌａｒｆｌａｒｅｓｒｅｆｌｅｃｔｔｈｅｅｎｅｒｇｅｔｉｃｓｏｆｃｏｒｒｅｓｐｏｎｄｉｎｇｍａｇｎｅｔｉｃｆｉｅｌｄｓ.Ｒｅｓｅａｒｃｈｉｎｇｔｈｅｓｏｌａｒｆｌａｒｅｐａｒａｍｅｔｅｒｓｉｎ 1 1 - ｙｅａｒｓｏｌａｒｃｙｃｌｅｓｃｏｕｌｄｔｈｒｏｗｌｉｇｈｔｏｎｔｈｅｅｎｅｒｇｅｔｉｃｓｏｆｍａｇｎｅｔｉｃｓｔｒｕｃｔｕｒｅｓｆｏｒｍｉｎｇｔｈｅｂａｓｉｓｏｆｔｈｅｃｈｒｏｍｏｓｐｈｅｒｉｃａｎｄｃｏｒｏｎａｌａｃｔｉｖｉｔｙ .Ｔｈｅｖａｒｉａｂｉｌｉｔｙｏｆｔｈｅ…     

挪威Gullfaks油田聚合物辅助活性剂驱的经济可行性评价

介绍了为评价挪威Ｇｕｌｌｆａｋｓ油田进行聚合物辅助活性剂驱替（ＰＡＳＦ）的经济效益而进行的部分研究和定量分析工作,论述了ＰＡＳＦ室内实验和数值模拟研究情况,并全面评价了ＰＡＳＦ的潜力。实验部分包括不同温度,压力和气油比条件下进行的岩心驱替实验,以优选适合ＧｕｌｌｆａｋｓＢｒｅｎｔ地层条件下的ＰＡＳＦ系统,ＰＡＳＦ系统中采用表面活性支键磺酸盐和生物胶。活性剂聚合物段塞中伴有５００ｐｐｍ的生物胶以便控     

MARINE AND COASTAL CONSERVATION IN CHINA

１ＩｎｔｒｏｄｕｃｔｉｏｎＣｈｉｎａａｂｕｔｓｏｎｔｈｅＢｏｈａｉ,Ｙｅｌｏｗ,ＥａｓｔＣｈｉｎａａｎｄＳｏｕｔｈＣｈｉｎａＳｅａｓａｎｄｉｎｃｏｒｐｏｒａｔｅｓｍｏｒｅｔｈａｎ６５００ｉｓｌａｎｄｓｏｆｖａｒｙｉｎｇｓｉｚｅｓ（Ｆｉｇ．１）．Ｔｈｅ...     

厦门港的中华白海豚Ⅳ.脊柱、肋骨、胸骨及肢带骨

对厦门 ３头中华白海豚成体标本Ｓ_６、Ｓ_７、Ｓ_１０的脊柱、肋骨、胸骨及肢带骨进行了系统研究。颈椎７块,第一、二颈椎基本愈合;胸椎１２块,通过横突与１２对肋骨相联;腰椎１０块,横突、脊突均发达;尾椎２２块。肋骨１２对,前５对双头,后７对单头;前７对肋骨为双节,后５对为单节。两头幼仔标本 Ｓ_９与 Ｓ_１１的胸骨分别为两部分和三部分组成,由软骨联结,成体骨化愈合为一块。