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Copyright of Power Generation Technology is the property of Power Generation Technology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Geomatics & Information Science of Wuhan University is the property of Geomatics & Information Science of Wuhan University and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of East China University of Science & Technology is the property of Journal of East China University of Science & Technology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Mechanical & Electrical Engineering is the property of Mechanical & Electrical Engineering Magazine and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Oilfield Chemistry is the property of Sichuan University, Oilfield Chemistry Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Chongqing University of Technology (Natural Science) is the property of Chongqing University of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Modern Preventive Medicine is the property of Modern Preventive Medicine Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chemical Engineering (China) / Huaxue Gongcheng is the property of Hualu Engineering Science & Technology Co Ltd. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Chongqing University of Technology (Natural Science) is the property of Chongqing University of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Shandong Medical Journal is the property of Shandong Medical Health Newspapers and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Zhengzhou University (Natural Science Edition) is the property of Journal of Zhengzhou University (Natural Science Edition) Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Shanghai University / Shanghai Daxue Xuebao is the property of Journal of Shanghai University (Natural Sciences) Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Mental Health Journal / Zhongguo Xinli Weisheng Zazhi is the property of Chinese Mental Health Journal and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

After South-to-North Water Diversion Project, the south water transferring Yangtze River entered Beijing, the groundwater exploitation pattern in the Beijing plain area changed, resulting in corresponding changes in the dynamics of the groundwater level and the development characteristics of land subsidence. This paper reviews the historical characteristics of the development of land subsidence in the Beijing Plain, and analyzes the development and change characteristics of the main subsidence areas, subsidence centers and groundwater funnels after the South Water enters Beijing. On this basis, the response characteristics of land subsidence in the process of groundwater level rise in different compression layer groups at Tianzhu, Baxianzhuang, Pinggezhuang and Zhangjiawan monitoring stations are studied. The results show that: (1) The land subsidence range in the Beijing Plain has gradually shrunk from two major areas in the north and south into several independent subsidence areas, and the central subsidence rate has developed in a linear downward trend. (2) The transformation of the groundwater falling funnel from expansion to contraction is highly consistent with the distribution of the land subsidence mitigation range. The groundwater level rise is an effective factor to inhibit the rapid development of the subsidence rate. (3) In the process of groundwater level rising, the soil deformation characteristics of different layers show great differences. The first compression layer group shows the characteristics of changing from plastic deformation to elastic deformation, and the second and third compression layer groups show that the plastic deformation includes creep deformation features and elastoplastic deformation features. [ABSTRACT FROM AUTHOR]

Copyright of Chinese Medical Equipment Journal is the property of Chinese Medical Equipment Journal Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Coal Science & Technology (0253-2336) is the property of Coal Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Electroplating & Finishing is the property of Electroplating & Finishing Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Due to the lack of effective test equipment and test methods, there was a lack of test research on the main shaft bearings of high-power wind turbines in the industry. Therefore, the influence of bearing load, operating temperature and operating speed on the bearing oil film thickness and life was studied. Firstly, the three-dimensional model of the main shaft test-bed was built and analyzed with Romax software. Based on GL2012 guide, the bearing load was calculated according to the maximum contact stress 1 650 MPa and bearing life 175 000 hours. Then, based on the calculated load and bearing rate speed, the effect of bearing load, temperature and speed on film thickness, contact stress and bearing life were analyzed. Finally, according to the film thickness and contact stress, the test load was determined. The results indicate that in order to avoid the edge stress concentration circumstance, bearing load must be less than 8 822 kN. In order to realize the elasto-hydrodynamic lubrication effect during test, the bearing temperature must be less than 65 ℃. When the bearing speed increases from 10.5 r/min to 30.6 r/min, the bearing minimum oil film thickness increases by 188%. According to the requirement of 175 000 hours fatigue life, when the bearing test speed is 12 r/min, the equivalent test is 2 984 hours under the load 8 500 kN, and the above results provide theoretical support for the actual bearing test. [ABSTRACT FROM AUTHOR]

Copyright of Coal Science & Technology (0253-2336) is the property of Coal Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Refrigeration is the property of Journal of Refrigeration Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Piezoelectrics & Acoustooptics is the property of Piezoelectric & Acoustooptic and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Application Research of Computers / Jisuanji Yingyong Yanjiu is the property of Application Research of Computers Edition and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Dalian University of Technology / Dalian Ligong Daxue Xuebao is the property of Journal of Dalian University of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Engineering Geology / Gongcheng Dizhi Xuebao is the property of Journal of Engineering Geology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Bulletin of the Chinese Ceramic Society is the property of Bulletin of the Chinese Ceramic Society Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The geochemical characteristics and genesis of selenium are of increasing interest in soil geochemistry research, as there exist fundamental problems in the development of selenium-enriched agricultural products. Therefore, this study performed a comprehensive analysis of data statistics using 43185 surface soil samples obtained in southeast Guizhou. The results showed that the geometric mean of selenium in the soil is 0.49 μg/g; the mean value of selenium in the black shale of cultivated soil is 1.55 μg/g, which is > sandstone (siliceous; 1.22 μg/g) > carbonaceous limestone (0.66 μg/g) > phyllitic slate (0.60 μg/g) > mudstone (0.58 μg/g) > dolomite (0.54 μg/g) > diabase (0.52 μg/g) > granite (0.48 μg/g) > variegated sand (gravel; 0.47 μg/g) > limestone (0.43 μg/g) > slate and metamorphic tuffite (0.42 μg/g) > purple sandstone (0.32μg/g) > mud, gravel, and sand (0.27μg/g). This indicates that the average content of selenium in soil is closely related to the parent rock. Meanwhile, combined with heavy metal elements in the area of an arable land soil pollution risk assessment, the cultivated land with black shale, sandstone (siliceous), carbonaceous limestone, mudstone, and dolomite was divided into high-grade and low-grade selenium-rich potential areas. The results of this study will provide a scientific basis for the development of selenium-rich agriculture in mountainous areas [ABSTRACT FROM AUTHOR]

Aiming at the abnormal wear problem on the inner ring of double spherical roller bearing, the bearing clearance, moller osculation, bearing roller profile modification and bearing span of the wind turbine bearings were studied and analyzed. Based on the effect of different bearing parameters on the contact pattern of the bearing roller, the useful methods were proposed to eliminate the edge contact problem. The three-dimensional model of the main shaft transmission system was built and analyzed with Romax software. The research results indicate that the bearing clearance has little effect on the bearing contact stress. By reducing the bearing roller tightness or modifying the miller profile, the odge stress concentration circumstance and the abnormal wear of the bearing raceways can be eliminated, while the contact stress of the roller can be increased. The bearing, span has major effect on the contact stress, the shorter bearing span is, the higher the miller contact stress is and the greater the edge contact stress is [ABSTRACT FROM AUTHOR]

The Jinzhan area, located in eastern Beijing, is a part of the Beijing plain area with the worst land subsidence. It belongs to the eastern subsidence region of the Beijing plain where the subsidence rate is the most significant across the city. The subsidence rate has exceeded 100 mm/a for many consecutive years with an annual growing cumulative subsidence. A core drilling experiment in the Jinzhan area was conducted over a depth interval of 0–300 m. The soil mechanical properties of the area were systematically analyzed through an experiment on core data for different depths, and the local stratigraphic structure was revealed. Based on the stratigraphic chronology, lithology, burial conditions, and groundwater recharge-runoffdischarge conditions, the 0–300 m strata were vertically divided into four compressible layers. The subsidence levels of different strata in each compressible layer from 2007 to 2017 were calculated according to their respective groundwater table variations. For cumulative subsidence of 1427.49 mm, the Quaternary compressible layer made the greatest contribution of 1038.65 mm. Thus, when the sandy soil in the strata is thick, its contribution to land subsidence is never negligible. [ABSTRACT FROM AUTHOR]

Copyright of Shanghai Land & Resources / Shanghai Guotu Ziyuan is the property of Editorial Board of Shanghai Land & Resources and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Experimental Technology & Management is the property of Experimental Technology & Management Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Experimental Technology & Management is the property of Experimental Technology & Management Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Transactions of the Chinese Society of Agricultural Engineering is the property of Chinese Society of Agricultural Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Experimental Technology & Management is the property of Experimental Technology & Management Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of South China Agricultural University is the property of Gai Kan Bian Wei Hui and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Economic Science / Jingji Kexue is the property of Economic Science Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The sediment concentration in the Yellow River is large and the reservoirs in the mainstream suffer from siltation of different degrees. A new concept and method that combining hydraulic power with strong artificial measure was proposed by this article. This method used pressure air to uplift flow in order to enhance turbulence and improve sediment transport. A flume test was introduced by this paper to study the transport of the prototype sand in the Yellow River. The results show that 28% sediment over the air vent is setting up and carried by flow during a period of deaeration, while only 8% settle down in the down reach of flume, which means 20% is carrying to the outside of flume. Taking Xiaolangdi Reservoir of the Yellow River for an example, the feasibility of applying pneumatic system was analyzed and a preliminary scheme was proposed. [ABSTRACT FROM AUTHOR]