检索结果-南通市图书馆

Intelligent Interference Management and Secure Communications for Satellite-terrestrial Integrated Systems

在线全文

学校读者我要写书评

暂无评论

China Communications 2022年第7期19卷 I0002-I0004页

作者： Lidong Zhu Michele Luglio Gengxin Zhang Mingchuan Yang University of Electronic Science and Technology of China 不详 Nanjing University of Posts and Telecommunications NanjingChina Communication Research Center Harbin Institute of Technology China

Satellite-terrestrial integrated(STI)systems represent the right solution to meet complex requirements of several services and sharing of the limited spectral resources between satellite systems and terrestrial ones must be considered to optimize performance.Network architectures and traffic demand are different for the satellite component and for the terrestrial 5G/6G one,so that the requirements of spectral resources for satellite and terrestrial systems are expected to vary dynamically in a significant range.

关键词： terrestrial Communications Interference

terrestrial dissolved organic carbon consumption by heterotrophic bacterioplankton in the Huanghe River estuary during water and sediment regulation

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Oceanology and Limnology 2019年第3期37卷 1062-1070页

作者： ZHANG Mingliang YU Guanglei WANG Fei LI Bin HAN Huizong QI Zhanhui WANG Tengteng Shandong Province Key Laboratory of Restoration for Marine Ecology Shandong Marine Resource and Environment Research InstituteYantai 264006China Guangdong Provincial Key Laboratory of Fishery Ecology and Environment South China Sea Fishery Research InstituteChinese Academy of Fishery SciencesGuangzhou 510300China

Nearly 20%–50% of the annual terrestrial dissolved organic carbon(DOC)from the Huanghe(Yellow)River was transported to the estuary during the 5-14d of water and sediment regulation.The concentration of DOC increased sharply during the period of water and sediment regulation,which may promote the terrestrial DOC consumption by heterotrophic bacterioplankton.Water and sediment regulation provides an ideal condition for the study of terrestrial DOC consumption by heterotrophic bacterioplankton when terrestrial DOC increases sharply in rainy season,which may help to seek the fates of terrestrial DOC in the estuaries and coasts.In this study,the concentration and stable isotope of DOC,the biomass,growth,and respiration of heterotrophic bacterioplankton were determined.By the study,we found both average percent contribution of terrestrial DOC to the DOC pool and Contribution of terrestrial DOC to the carbon composition of heterotrophic bacterioplankton decreased as distance from the river mouth increased off shore,which was deceased from(39.2±4.0)%,(37.5±4.3)%to(30.3±3.9)%,(28.2±3.9)%respectively.255-484μg C/(L·d)terrestrial DOC was consumed by heterotrophic bacterioplankton.And 29%-45%terrestrial DOC consumed by heterotrophic bacterioplankton releasing as CO2 by respiration.Comparing with tropical estuary,terrestrial DOC consumed by heterotrophic bacterioplankton was lower in temperate estuary(this study).Temperature may limit the consumption of terrestrial DOC by heterotrophic bacterioplankton.

关键词： terrestrial dissolved organic carbon heterotrophic bacterioplankton carbon stable isotope biogeochemical cycles

terrestrial transect study on driving mechanism of vegetation changes

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2008年第7期51卷 984-991页

作者： ZHANG YuJin1,2 & ZHOU GuangSheng1 1 State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China 2 Graduate University of Chinese Academy of Sciences, Beijing 100049, China State Key Laboratory of Vegetation and Environmental Change Institute of Botany Chinese Academy of Sciences Beijing China Graduate University of Chinese Academy of Sciences Beijing China

In terms of Chinese climate-vegetation model based on the classification of plant functional types, to- gether with climatic data from 1951 to 1980 and two future climatic scenarios (SRES-A2 and SRES-B2) in China from the highest and the lowest emission scenarios of greenhouse gases, the distribution patterns of vegetation types and their changes along the Northeast China Transect (NECT) and the North-South Transect of Eastern China (NSTEC) were simulated in order to understand the driving mechanisms of vegetation changes under climatic change. The results indicated that the vegetation distribution patterns would change significantly under future climate, and the major factors driving the vegetation changes were water and heat. However, the responses of various vegetation types to the changes in water and heat factors were obviously different. The vegetation changes were more sensi- tive to heat factors than to water factors. Thus, in the future climate warming will significantly affect vegetation distribution patterns.

关键词： driving mechanism vegetation terrestrial transect climatic change plant functional types

terrestrial heat flow in Junggar Basin, Northwest China

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2000年第19期45卷 1808-1813页

作者： WANG Shejiao HU Shengbiao LI Tiejun WANG Jiyang ZHAO Wenzhi Institute of Geology and Geophysics Chinese Academy of SciencesBeijing 100029China Research Institute of Petroleum Exploration and Development CNPCBeijing 100083China

Based on temperature logs of 117 boreholes and thermal conductivity of 119 rock samples, the first group of 35 heat flow data in the Junggar Basin are presented. The thermal gradients vary between 11.6 and 26.5℃/km , and the thermal conductivity changes from 0.17 to 3.6 W/mK. Heat flow ranges from 23.4 to 53.7 mW/m2 with a mean of (42.3±7.7) mW/m2. The heat flow pattern shows that heat flow is higher in the uplifts and lower in the depressions. The factors affecting the heat flow and its distribution include basin type, basement structure, sediment thickness, radioactive heat generation, etc. The overall low present-day heat flow in the Junggar Basin reflected its tectonothermal evolution characterized by lithospheric thickening, thrust and fault at shallow crust as well as consequently quick subsidence during the Late Cenozoic.

关键词： geothermal gradient thermal conductivity terrestrial heat flow Junggar Basin.

Global change hydrology:terrestrial water cycle and global change

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2020年第3期63卷 459-462页

作者： Qiuhong TANG Key Laboratory of Water Cycle and Related Land Surface Processes Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of Sciences University of Chinese Academy of Sciences

1.Introduction Global Change Hydrology(GCH)is an emerging interdisciplinary field that links global change research and hydrology.GCH integrates hydrology,climatology,and geography to study the interactions between the terrestrial water cycle and global change across various time and space scales.The main objective of GCH is to understand the natural and anthropogenic causes of the changing terrestrial water cycle and the associated influences and feedbacks in the Earth system.

关键词： hydrology terrestrial Global

terrestrial HEAT FLOW IN THE 4TH GEOSCIENCE TRANSECTION OF CHINA

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 1992年第15期37卷 1283-1287页

作者：梁恕信孙彤彰韩友珍师水月 Earthquake Research Institute of Lanzhou SSB Lanzhou 730000 PRC

Ⅰ. INTRODUCTIONThe 4th geoscience transection is a section of Global Geoscience Transection (GGT). It is from Menyuan County of Qinghai through Shangxian County of Shaanxi to Ningde County of Fujian in the west-north... 详细信息

关键词： geoscience transection terrestrial heat flow isothermal thinning and thickening.

The first report of terrestrial Petroxestes from the Lower Cretaceous Yixian Formation,western Liaoning, China

在线全文

学校读者我要写书评

暂无评论

Journal of Palaeogeography 2018年第4期7卷 337-345页

作者： Jiang Xu En-Pu Gong Tie-Hui Wang Xiao-Hong Chen Resources and Civil Engineering College of Northeastern University Shenyang 110819 Liaoning Province China

Abundant aggregated, elongate, shallow borings have been discovered from the Lower Cretaceous Yixian Formation in western Liaoning, China. By contrast with several similarly-shaped trace fossils, such as Asthenopodichnium, Teredolites,Rogerella, Cubiculum and Petroxestes, their appearance, size, arranged modes, distribution density and substrate types are most similar with traces of Petroxestes that was discovered from Southern Ohio, USA（J. Paleontol. 62： 306-08,1988）. This is the first report of Petroxestes from China, and also the first report of these traces from a terrestrial environment.

关键词： Trace fossils Jehol biota Carbonate rocks terrestrial Petroxestes

terrestrial Degassing, Thermal Infrared Anomaly and Earthquakes

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 1993年第13期38卷 1108-1113页

作者：强祖基孔令昌赁常恭王弋平李秋珍 Institute of Geology State Seismological Bureau Beijing 100029 PRC Satellite Meteorological Center State Meteorological Administration Beijing 100081 PRC.

1 Satellite Thermal Infrared Anomaly and Earthquakes The friction of faults during earthquakes produces a large amount of heat, which sufficiently causes water and other fluid in rocks and soils along either side of the faults to gasify and produce a large amount of electric charge, similar to the lightning in thunderstorms. The strong discharge of electric field in lower part of the atmosphere, which is caused

关键词： terrestrial degassing thermal IR anomaly earthquakes excitation.

terrestrial HEAT FLOW IN THE 5TH GEOLOGICAL TRANSECTION OF CHINA

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 1990年第16期35卷 1364-1368页

作者：吴乾蕃祖金华谢毅真廉雨方 Institute of Geology State Seismological Bureau Beijing 100011 PRC

Ⅰ. INTRODUCTIONSurveying the China geological transection and compiling the maps is a study task organized by the China Lithosphere Committee, and it is also an important subject of the International Lithosphere Prog... 详细信息

关键词： geological transection terrestrial heat flow.