检索结果-南通市图书馆

Preliminary reconstruction of the desert and sandy land distributions in china since the last interglacial period

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

Science china Earth Sciences 2004年第z1期47卷 89-100页

作者： CHEN Huizhong, SU Zhizhu, YANG Ping & DONG GuangrongKey Laboratory of Desert and Desertification, Cold and Arid Regions Environmental and Engineering Research institute, Chinese Academy of Sciences, Lanzhou 730000, china State Key Laboratory of loess Quaternary Geology, institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710075, china institute of loess plateau, shanxi university, taiyuan 03.006, china 1. Key Laboratory of Desert and Desertification Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences 730000 Lanzhou China 2. State Key Laboratory of loess Quaternary Geology Institute of Earth Environment Chinese Academy of Sciences 710075 Xi’an China 3. institute of loess plateau Shanxi University 030006 Taiyuan China

The desert and sandy land are the products of arid climate. The spatial distribution of modern deserts and sandy land in china and their relation to climate show following characteristics: arid and hyper-arid desert zones, at isohyet of less than 200 mm, are dominated by mobile dunes; semi-arid steppe and arid desert steppe with the precipitation between 200?00 mm, are dominated by semi-fixed and fixed sand dunes; the precipitation of sub-humid forest grassland and humid forest zones with scattered fixed sand land is higher than 400 mm. With this as reference, in combination with considerable amount of paleoclimatic data in desert regions and adjacent regions, the distributions of desert and sandy land in china during the last intergla-cial period, the last glacial maximum (LGM), and the Holocene megathermal, were preliminarily reconstructed. The results compared with that of today show that the distribution of desert and sandy land in china was greatly dwindled during last interglacial period, and the mobile dune area was about two-thirds of that of today's, but greatly expanded during LGM. However, the dwindling area of desert and sandy land in the Holocene megathermal was smaller than that in the last interglacial period. The forcing mechanism was mainly related to the changes of East Asian winter and summer monsoon, south-northward swing of the westerlies and the variations of the Qinghai-Tibet plateau monsoon intensity caused by global climate changes during the cold and warm intervals since the last interglacial period.

关键词： the glacial-interglacial period, desert, sandy land, spatial distribution.

中国政治经济学年度发展报告（2023）（下）

在线全文

学校读者我要写书评

暂无评论

政治经济学评论 2024年第3期 90+207-208页

作者： Center for Studies of Contemporary Political Economy,Research institute for 21st-Century Marxism,Nankai university·university of Chinese Academy of Social Science Center for Teaching and Research on Capital,Renmin university of china National institute of Socialist Political Economy with Chinese Characteristics,Renmin university of china 南开大学·中国社会科学院大学21世纪马克思主义研究院当代政治经济学研究中心中国人民大学《资本论》教学与研究中心中国人民大学全国中国特色社会主义政治经济学研究中心

编者按2023年，高质量发展扎实推进，新质生产力加快形成，我国经济总体回升向好，圆满实现发展主要预期目标。为针对性地破解经济恢复发展中的难题，聚焦推进中国式现代化进程中的重点、难点问题，中国政治经济学界开展系统深入研究，...

编者按2023年，高质量发展扎实推进，新质生产力加快形成，我国经济总体回升向好，圆满实现发展主要预期目标。为针对性地破解经济恢复发展中的难题，聚焦推进中国式现代化进程中的重点、难点问题，中国政治经济学界开展系统深入研究，取得系列代表性成果。为准确刻画学界研究进展和轨迹，推动中国经济学理论体系的构建和完善，本刊精选议题如期奉上《中国政治经济学年度发展报告（2023）》。自2010年起，本刊连续十四年发布《中国政治经济学年度发展报告》，“年度发展报告”专栏已成为本刊标志性特色栏目。2023年报告聚焦12个专题，分为（上）（下）两篇，其中专题1—6于报告（上）篇刊登，专题7—12由报告（下）篇刊登。2023年报告（下）选题如下：

关键词：

New views on age of the Salawusu Formation of Late Pleistocene in northern china

同方期刊数据库人大复印报刊资料评论

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 1999年第7期44卷 646-650页

作者： DONG Guangrong, SU Zhizhu and JIN Heling institute of Desert Research , Chinese Academy of Sciences , Lanzhou 730000, china Xi an Laboratory of loess and Quaternary Geology, Chinese Academy of Sciences , Xi’ an 710054, china institute of loess plateau , shanxi university, taiyuan 03.006, china institute of Desert Research Chinae Academy of Sciences Lanzhau China Xi’an Laboratory of Lass and Quaternary Geology Chinese Academy of Sciences Xi’an China institute of Lass plateau Shanxi University Taiyuan China

The Salawusu Formation in the Salawusu River basin of Inner Mongolia is a typical sequence of the Upper Pleistocene in northern china. However, there have been some different views about the division and age of stratigraphic facies since the establishment of the Salawusu Formation. According to the stratigraphic subdivision and dating of the Dishaogouwan section, it is thought that the fluviolacustrine-aeolian sand sequence from the Dishaogouwan section can be compared with loess, deep-sea deposit records and climatic fluctuations of glacial period. The Salawusu Formation of fluviolacustrine facies was formed in the last interglacial period from 140 to 70 ka BP, roughly corresponding to the fifth stage of deep-sea oxygen isotope, and developed in the same period as the palaeosol S1 on the loess plateau; the aeolian sand of the Chengchuan Formation was formed in the last glacial period from 70 to 10 ka BP, constituting the heteropic geological body along with the Malan loess on the loess plateau; the

关键词： Salawusu Formation age deep-sea oxygen isotope.

Synthesis of 2,6-Dimethoxyhydroquinone-3-mercaptoacetyl-peptide-chlorambucil Conjugates

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2000年第10期11卷 879-882页

作者： Yu Fei SONG (institute of Molecular Science, shanxi university, taiyuan 03.006) shanxi Univ Inst Mol Sci Taiyuan 030006 Peoples R China

This paper reports a continous study of the use of short chain peptides as carriers of a potential antitumor agents: 2,6-dimethoxyhydroquinone-3-mercaptoacetic acid (DMQ-MA). In an effort to carry out anti-cancer drug design, we synthesized another two new DMQ-MA-peptide-chlorambucil (CRB) derivatives: DMQ-MA-Lys(CRB)-Arg-OMe, DMQ-MA-Lys(DMQ-MA)Lys(CRB)-Arg-OMe. These peptide-chlorambucil conjugates were synthesized by coupling protected amino acids in solution and the next conjugation was achieved by reacting with pentafluorophenyl ester of DMQ-MA in DMF. The CRB in side chain was coupled by deblocking the lysyl-carbobenzyloxy protecting group Z and then reacting with the pentafluorophenyl ester of chlorambucil (CRB). Further study on cytotoxicity, DNA binding, and sequence specificity of DNA alkylation of these two new conjugates are investigating.

关键词： 2.6-dimethoxyhydroquinone-3-mercaptoacetic acid chlorambucil peptide

THE MICRO-VOID GROWTH MODEL IN DUCTILE MATERIAL

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Solida Sinica 2000年第3期13卷 277-282页

作者： Zhang Changsuo (Mining institute of taiyuan university of Technology,taiyuan 030024,china) Mining institute of taiyuan University of Technology Taiyuan 030024 Australia

Based on the unbounded matrix, a void growth model is proposed inthis paper. In this mod- el, extending the Griffith criterion ofenergy conservation during the expanding of cracks to the case ofimpact loading, we propose an assumption that the strain energy inmatrix can transform into its surface energy and kinetic energyduring the micro-void growth. The void growth velocities of the OFHCcopper and LY12 alu- minim are calculated, and the result of whichagrees with that of Seaman

关键词： unbounded matrix grwoth model ductile material

Mathematical Model for the Drying Process of Granular Materials in a Fluidized Bed

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2000年第4期14卷 296-300页

作者： Xiulan Huai, Li Wang, Zhiyun Qu ( Mechanical Engineering School, university of Science and Technology Beijing, Beijing 100083, china Chemical Industry Research institute of shanxi, taiyuan 030031, china) Mechanical Engineering School University of Science and Technology Beijing Beijing 100083 China Chemical Industry Research institute of shanxi Taiyuan 030031 China

The experiment of granular materials, barley, drying in a fluidized bed was carried out to investigate the influence of the factors, inlet air temperature, air moisture, bed height and original moisture content of the dried materials on drying process. Based on the experimental data, a corresponding mathematical model is presented. As a conclusion, a higher inlet air temperature and a reasonable bed height should be used so as to increase the dring rate and to improve the product quality.

关键词： fluidization granular materials drying, experimental investigation mathematical model Information

在线全文

学校读者我要写书评

暂无评论

森林植被的自然火干扰

生态学杂志 1998年第1期17卷 54-60页

作者：邱扬山西大学黄土高原研究所

森林植被的自然火干扰邱扬（山西大学黄土高原研究所，太原０３０００６）ＮａｔｕｒａｌＦｉｒｅＤｉｓｔｕｒｂａｎｃｅｏｆＦｏｒｅｓｔＶｅｇｅｔａｔｉｏｎ．ＱｉｕＹａｎｇ（ＩｎｓｔｉｔｕｔｅｏｆＬｏｅｓＰｌａｔｅａｕ，Ｓ... 详细信息

森林植被的自然火干扰邱扬（山西大学黄土高原研究所，太原０３０００６）ＮａｔｕｒａｌＦｉｒｅＤｉｓｔｕｒｂａｎｃｅｏｆＦｏｒｅｓｔＶｅｇｅｔａｔｉｏｎ．ＱｉｕＹａｎｇ（ＩｎｓｔｉｔｕｔｅｏｆＬｏｅｓＰｌａｔｅａｕ，ＳｈａｎｘｉＵｎｉｖｅｒｓｉｔｙ，...

关键词：森林植被自然火生态学

Effects of Cu^(2+) on characteristic of SV currents

在线全文

学校读者我要写书评

暂无评论

Science china Chemistry 2006年第6期49卷 560-564页

作者： ZHANG Liping1,2 & YANG Pin1 1. Key Laboratory of Chemical Biology and Molecular Engineering of Ministry of Education, institute of Molecular Science, shanxi university, taiyuan 03.006, china 2. institute of Environment Science, taiyuan university of Science and Technology, taiyuan 030024, china 1. Key Laboratory of Chemical Biology and Molecular Engineering of Ministry of Education Institute of Molecular Science Shanxi University Taiyuan 030006 China 2. institute of Environment Science Taiyuan University of Science and Technology Taiyuan 030024 China

Applying the patch-clamp technique to vacuoles from Radish we studied the effects of Cu2+ on Slow Vacuolar (SV) current’s characteristic. Our results show that Cu2+ in bath solution at higher concentration inhibits SV currents and the percentage of inhibition increases with increasing concentration and changes with different voltage. When at lower concentration, Cu2+ significantly promotes the SV currents and the promotion ratio decrease with increasing voltage. At the same time, the time constants of activation become lesser after adding Cu2+. These results show that there may be some Cu2+ binding sites on SV channels and binding to which can change SV current’s characteristic.

关键词： the patch-clamp technique, vacuolar, Cu2+, SV channel.

Metal-amyloid-β peptide interactions: a preliminary investigation of molecular mechanisms for Alzheimer’s disease

在线全文

学校读者我要写书评

暂无评论

Science china Chemistry 2007年第4期50卷 453-467页

作者： JIAO Yong & YANG Pin Key Laboratory of Chemical Biology and Molecular Engineering of Ministry of Education, institute of Molecular Science, shanxi university, taiyuan 03.006, china 1. Key Laboratory of Chemical Biology and Molecular Engineering of Ministry of Education Institute of Molecular Science Shanxi University Taiyuan 030006 China

Although humans have spent exactly 100 years combating Alzheimer’s disease (AD), the molecular mechanisms of AD remain unclear. Owing to the rapid growth of the oldest age groups of the popula-tion and the continuous increase of the incidence of AD, it has become one of the crucial problems to modern sciences. It would be impossible to prevent or reverse AD at the root without elucidating its molecular mechanisms. From the point of view of metal-amyloid-β peptide (Aβ) interactions, we review the molecular mechanisms of AD, mainly including Cu2+ and Zn2+ inducing the aggregation of Aβ, cata-lysing the production of active oxygen species from Aβ, as well as interacting with the ion-channel-like structures of Aβ. Moreover, the development of therapeutic drugs on the basis of metal-Aβ interactions is also briefly introduced. With the increasingly rapid progress of the molecular mechanisms of AD, we are now entering a new dawn that promises the delivery of revolutionary developments for the control of dementias.

关键词： Alzheimer’s disease (AD) amyloid-β peptide Cu2+ Zn2+ molecular mechanisms aggregation active oxygen species ion channel