检索结果-南通市图书馆

The role of aerial algae in the formation of the landscape of the Yunnan Stone Forest,Yunnan Province, china

在线全文

学校读者我要写书评

暂无评论

Science china earth {2. 2004年第9期47卷 846-864页

作者： tian Youping1,3. ZHANG Jie2. SONG Linhua1 & BAO Haosheng2.1. Institute of Geographic {2. and Natural Resources Research, Chinese Academy of {2., beijing 100101, china 2. Department of Geography, Nanjing University, Nanjing 2.0093. china 3. school of earth {2. and Resources, china University of geosciences, beijing 100083, china Institute of Geographic sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China Department of Geography Nanjing University Nanjing 210093 China school of earth {2. and Resources China University of Geosciences Beijing 100083 China

Aerial algae on the surface of carbonate rocks at the Stone Forest, Shilin County, Yunnan Province, china, and their bioerosion were investigated in the field and studied in the laboratory in detail. Through the observation, identification and statistics of more than one hun- dred algal samples and rock samples with the optical microscopes (stereomicroscope, biological microscope) and the scanning electronic microscope (SEM), the relationships between erosional forms on the surface of the Stone Forest and algae and/or algal communities and the genetic mechanism for the formation of erosional forms were analyzed. It is suggested that aerial algae play an active role in bioerosive processes that may affect the formation of karst erosional forms. These effects include both direct and indirect ones. The direct effect is the initiative control (algal shape-controlling role) of algae on the formation of karst forms of various scales, mostly mi- cro-scale (3.) and minor-scale (10-3.10-1m) erosional forms. The algal shape-controlling roles can be divided into the algal individual shape-controlling role and the algal community shape-controlling role. The former mostly controls the formation of micro-scale erosional forms, while the latter mostly controls the formation of micro-scale and smaller minor-scale erosional forms. The indirect effect refers to the promoting role of algae in the formation of karst forms, which may affect the formation of karst forms of all types and scales. The bioerosion of algae accelerates the weathering process of the whole Stone Forest karst landforms.

关键词： aerial algae, bioerosion, the Stone Forest, Yunnan Province, china.

The Construction of Natural Disaster Database of Alxa and Periodicity Analysis

在线全文

学校读者我要写书评

暂无评论

地学前缘 2009年第S1期16卷 300-301页

作者： Yan Zheng,mingzhong tian,Siwen Liu,Chao Ma {2. of the {3. sciences and Resources,china University of geosciences(beijing),beijing 100083.china.

A compilation of all meaningful historical data of natural-disasters taken place in Alxa of inner-Mongolia is used here for the construction of a 65 Ma high precision *** data in the database are divided into subsets ... 详细信息

关键词： Alxa natural disaster databases periodicity

Latest progress on interactions between VLF/ELF waves and energetic electrons in the inner magnetosphere

在线全文

学校读者我要写书评

暂无评论

Science china earth {2. 2010年第3期53卷 317-326页

作者： XIAO FuLiang1,2. ZONG QiuGang3. SU ZhenPeng4, tian tian3.& ZHENG {2.iNan4 1 school of Physics and Electronic sciences, Changsha University of Science and Technology, Changsha 410004, china 2.State Key Laboratory of Space Weather, Chinese Academy of sciences, beijing 100190, china 3.Institute of Space Physics and Applied Technology, Peking University, beijing 100871, china 4 CAS Key Lab for Basic Plasma Science, school of {12. and Space sciences, University of Science and Technology of china, Hefei 2.002., china 1. school of Physics and Electronic sciences Changsha University of Science and Technology Changsha 410004 China2. State Key Laboratory of Space Weather Chinese Academy of Sciences Beijing 100190 China3. Institute of Space Physics and Applied Technology Peking University Beijing 100871 China4. CAS Key Lab for Basic Plasma Science School of Earth and Space Sciences University of Science and Technology of China Hefei 230026 China

Interactions between very/extremely low frequency (VLF/ELF) waves and energetic electrons play a fundamental role in dynamics occurring in the inner magnetosphere. Here, we briefly discuss global properties of VLF/ELF waves, along with the variability of the electron radiation belts associated with wave-particle interactions and radial diffusion. We provide cases of electron loss and acceleration as a result of wave-particle interactions primarily due to such waves, and particularly some preliminary results of 3. evolution of phase space density from our currently developing 3. code. We comment on the existing mechanisms responsible for acceleration and loss, and identify several critical issues that need to be addressed. We review latest progress and suggest open questions for future investigation.

关键词： wave-particle interaction VLF/ELF waves energetic electrons acceleration and loss inner magnetosphere

A subsurface runoff parameterization with water storage and recharge based on the Boussinesq-Storage Equation for a Land Surface Model

在线全文

学校读者我要写书评

暂无评论

Science china earth {2. 2006年第6期49卷 622-631页

作者： tian Xiangjun1,2. XIE Zhenghui1, ZHANG Shenglei1 & LIANG Miaoling1 1. LASG, Institute of Atmospheric Physics, Chinese Academy of {2., beijing 10002., china 2. Graduate school of the Chinese Academy of {2., beijing 10003., china 1. LASG Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China 2. Graduate school of the Chinese Academy of sciences Beijing 100039 China

Subsurface runoff in a land surface model is usually parameterized as a single-valued function of total storage in a basin aquifer reservoir. This kind of parameterization is often sin-gle-valued function of storage-discharge under a steady or “quasi-steady” state, which cannot rep-resent the influence of aquifer recharge on subsurface runoff generation. In this paper, a new sub-surface runoff parameterization with water storage and recharge based on the Boussinesq-storage equation is developed. This model is validated by a subsurface flow separation algorithm for an ex-ample river basin, which shows that the new model can simulate the subsurface flow reasonably.

关键词： Zsubsurface runoff parameterization Boussinesq-storage equation waterstorage and recharge

Study on Location and Size of National Geopark Museums

在线全文

学校读者我要写书评

暂无评论

地学前缘 2009年第S1期16卷 300-300页

作者： Peipei Yuan,mingzhong tian {2. of the {3. sciences and Resources,china University of geosciences(beijing),beijing 100083.china.

The museum of national geopark is the base for science education,and the important component of the national *** analyzing some national Geopark Museums,this paper suggests that in order to build a museum which can pl... 详细信息

关键词： national geopark museum location size

Analyzing the Completeness(Relative Minimum Magnitude) of History Seismic Catalogue in Sichuan Province

在线全文

学校读者我要写书评

暂无评论

地学前缘 2009年第S1期16卷 51-51页

作者： Li Sun,mingzhong tian {2. of the {3. sciences and Resources,china University of geosciences(beijing),beijing 100083.china.

Sichuan Province,East Western of china,within the area of east longitude 97°2.′-108°3.′,north latitude 2.°03.-3.°19′,which is on the Mediterranean seismic zone;with its complicated geological background,several strong shocks occurred in this district since ancient *** catalogue of this area could date back to B.C.2.,however,limited by the conditions—technology or funds,lots of minor {2.quake have been lost,which could be

关键词： history seismic catalogue Sichuan Province relative minimum magnitude surface-wave magnitude local-wave magnitude Gutenberg-Richter relation

From“Highbrow Art and Literature”to“Simple and Crude Folk Songs”—Based on Tourist-oriented,Improving the Guide Explanations in Order to Expand Geopark Museum's Influence

在线全文

学校读者我要写书评

暂无评论

地学前缘 2009年第S1期16卷 298-298页

作者： Yaoyuan Mei,mingzhong tian {2. of the {3. sciences and Resources,china University of geosciences(beijing),beijing 100083.china.

In recent years,geoparks have made enormous *** museum of geopark is often regarded as a significant window for knowing and learning about the geopark,which is not only stand for the integral image of the view,but also is the centre of tour commentary and *** this paper,the author deals with some problems existing in the process of explanation when museum guides of the geopark introduced and popularized the scientific knowledge of the *** to the development principle from"collection-based"to"tourist-oriented"。

关键词： geopark museum guide

The Geoheritage Resource Evaluation of Fossil-dominated Geoparks in china:Ningcheng Geopark of Inner Mongolia Case Study

在线全文

学校读者我要写书评

暂无评论

地学前缘 2009年第S1期16卷 295-295页

作者： Jing Guo,mingzhong tian,Siwen Liu,Yu{2.an Geng {3. of the earth sciences and Resources,china University of geosciences(beijing),beijing 100083.china.

There are more than 3. fossil-dominated geoparks established in *** of them are of high scientific *** to landscape-dominated geoparks,the fossil-dominated ones generally lack of charming natural sceneries,but the abundant and exquisite preserved fossils in geoparks are very attractive to the *** order to protect and exploit these fossils,the evaluation plays an important role in the geopark *** geopark is famous for the Mesozoic Daohugou *** fossil assemblage is different from Jehol biota,which attracts many *** this paper the

关键词： fussy math evaluation fossil resou rces geoheritage resources Ningcheng geopark china

Zircon SHRIMP geochronology and geochemistry of TTG rocks in Sushui Complex from Zhongtiao Mountains with its geological implications

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2006年第5期16卷 492-500页

作者： tian Wei, LIU Shuwen, LIU Chaohui, YU Shengqiang, LI Qiugen and WANG Yueran (Key Laboratory of Orogenic Belt and Crustal Evolution, MOE, {3. of earth and Space sciences, Peking University, beijing 100871, china) [a]Key Laboratory of Orogenic Belt and Crustal Evolution MOE School of Earth and Space Sciences Peking Univenity Beijing China

The tonalite-trondhjemite-granodiorite (TTG) rocks in Sushui Complex of Zhongtiao Block can be divided into two series according to their zircon U-Pb ages and geochemical characteristics: one is subduction-related (SR) and the other collision-related (CR) . The SR TTG rocks, together with other Late Archean island arc magmatism, were developed as a result of oceanic subduction between the Eastern and Western blocks in Late Archean; while the CR TTG rocks formed in a thickened crustal environment, which was responding to the collision between the Eastern and Western blocks in Paleoproterozoic. All these features support a model that the Zhongtiao Block is a part of the Trans-North china Orogen in the middle of North china Craton.

关键词： Sushui Complex Zhongtiao Block Trans-North china Orogen zircon U-Pb geochronology trace element simulation.