检索结果-南通市图书馆

台湾研究 2024年第1期 1-14页

作者： institute of taiwan studies, Chinese {1. of social sciences 中国社会科学院台湾研究所

2024年1.1.日,台湾地区领导人和立法机构“二合一”选举落下幕。民进党籍候选人赖清德、萧美琴当选台湾地区正副领导人。台湾地区立法机构总额1.3席中,中国国民党获52席,民进党获51.,民众党获8席,无党籍及未经政党推荐者获2席.

关键词：中国国民党民进党立法机构台湾地区民众党推荐者二合一候选人

New technique to control in situ oxygen fugacity in water-free high-pressure system──Using Cu-O as an example

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 1998年第16期43卷 1353-1358页

作者： LI Heping 1. XIE Hongsen 1. GUO Jie 1. ZHANG Yueming 1.XU Zuming 1.and XU Ji’an 2 1. institute of Geochemistry, Chinese {1. of sciences, Guiyang 550002, China 2. institute of Earth sciences, taiwan 1.529, China institute of Geochemistry Chinese Academy of Sciences Guiyang China institute of Earth {1. Taiwan China

Through inserting a solid oxygen-specific electrolyte (YSZ) inside and exerting an electrical power of direct current outside between the sample and oxygen reservoir (an solid oxygen buffer), oxygen was driven by the power from the cathodic electrode area into the positive electrode area at high temperature and high pressure. In this way, the oxygen fugacity in the sample was in situ controlled independently of temperature and pressure. By using Cu-O system as an example, this technique was proved to be successful.

关键词： in situ control of oxygen fugacity water-free system high temperature and high pressure.

在线全文

学校读者我要写书评

暂无评论

Friendly Skies

Beijing Review 2008年第40期51卷 20-21页

作者： YIN MAOXIANG the institute of taiwan studies,Chinese {1. of social sciences

New policies bring the two sides of the taiwan Straits closer to the goal of "three links" The Mid-Autumn Festival,which fell on September 1. this year,

关键词： Friendly Skies SEF

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

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 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 {1. of sciences, Beijing 1.0029, China 2. Graduate School of the Chinese {1. of sciences, Beijing 1.0039, China 1. LASG Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China 2. Graduate School of the Chinese academy of {1. 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

Experimental investigation and numerical simulation on the effect of fissure water pressure in vertical sliding surface

在线全文

学校读者我要写书评

暂无评论

Science China(Technological sciences) 2005年第z1期48卷 53-64页

作者： ZHANG Lei1.2, LI Shihai1. LIAN Zhenzhong1.2 & WANG Yuannian1.1. institute of Mechanics, Chinese {1. of sciences, Beijing 1.0080, China 2. Graduate School, Chinese {1. of sciences, Beijing 1.0060, China 1. institute of Mechanics Chinese Academy of Sciences 100080 Beijing China 2. Graduate School Chinese Academy of Sciences 100060 Beijing China

This paper studies the effect of fissure water pressure in different fractures on the critical angle of landslide by laboratory investigation and numerical simulation in order to understand the mechanisms of fissure water pressure on landslide stability. Laboratory observations show that the effect of fissure water pressure on the critical angle of landslide is little when the distance between water-holding fracture and slope toe is three times greater than the depth of fissure water. These experimental results are also simulated by a three-dimensional face-to-face contact discrete element method. This method has included the fissure water pressure and can accurately calculate the critical angle of jointed slope when fissure water pressure in vertical sliding surface exists. Numerical results are in good agreement with experimental observations. It is revealed that the location of water-holding structural surface is important to landslide stability. The ratio of the distance between water-holding fissure and slope toe to the depth of fissure water is a key parameter to justify the effect of fissure water pressure on the critical angle of landslide.

关键词： jointed rock slope, discrete element method, fracture in vertical sliding surface, model experiment,fissure water pressure.

Kinetics and reaction mechanism of phenol hydroxylation catalyzed by La-Cu_4FeAlCO_3

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2005年第6期48卷 530-537页

作者： CHEN Chunxia1.2, XU Chenghua1. FENG Liangrong1. SUO Jishuan1.& QIU Fali1.1. Chengdu institute of Organic Chemistry, Chinese {1. of sciences, Chengdu 61.041. China 2. Graduate School of the Chinese {1. of sciences, Beijing 1.0039, China 1. Chengdu institute of Organic Chemistry Chinese Academy of Sciences 610041 Chengdu China 2. Graduate School of the Chinese academy of {1. 100039 Beijing China

The present work synthesizes La-Cu4FeAlCO3 catalyst under microwave irradiation and characterizes its structure using XRD and IR techniques. The results show that the obtained La-Cu4FeAlCO3 has a hydrotalcite structure. In the phenol hydroxylation with H2O2 catalyzed by La-Cu4FeAlCO3, the effects of reaction time and phenol/H2O2 molar ratio on the phenol hy-droxylation, and relationships between the initial hydroxylation rate with concentration of the catalyst, phenol, H2O2 and reaction temperature are also investigated in details. It is shown the phenol conversion can reach 50.09% (mol percent) in the phenol hydroxylation catalyzed by La-Cu4FeAlCO3, under the reaction conditions of the molar ratio of phenol/H2O2 1.2, the amount ratio of phenol/catalyst 20, reaction temperature 343 K, reaction time 1.0 min, 1. mL distilled water as solvent. Moreover, a kinetic equation of v = k[La ? Cu 4 FeAlCO 3 ][C 6 H 5 OH][H 2 O 2]. and the activation energy of Ea=58.37 kJ/mol are obtained according to the kinetic studies. Due to the fact that the HO-Cu+-OH species are detected in La-Cu4FeAlCO3/H2O2 system by XPS, the new mechanism about the generation of hydroxyl free radicals in the phenol hydroxylation is pro-posed, which is supposed that HO-Cu+-OH species are transition state in this reaction.

关键词： rare earth, hydrotalcite, microwave irradiation, phenol hydroxylation, kinetics, reaction mechanism.

Case studies on mesoscale structures of heavy rainfall system in the Yangtze River generated by Meiyu front

在线全文

学校读者我要写书评

暂无评论

Science China Earth sciences 2005年第8期48卷 1303-1311页

作者： LIU Liping1. RUAN Zheng1.& QIN Danyu2 1. Chinese academy of Meteorological {1., Beijing 1.0081. China 2. Nanjing institute of Meteorology, Nanjing 21.044, China 1. Chinese academy of Meteorological {1. 100081 Beijing China 2. Nanjing institute of Meteorology 210044 Nanjing China

A heavy rainfall system was observed over the Yangtze River during Meiyu season by using dual-Doppler radar systems in the field experiment conducted by the project of National Fundamental Research Planning “Research on formation mechanism and the prediction theory of hazardous weather over China”. The three-dimensional mesoscale kinematic structure and process of a heavy rain on 22 and 23 July, 2002 are investigated by using the radial velocity and dual-Doppler radar technique. The results show that a southwest-northeast oriented rain band with the length of about 1.00 km involves numbers of meso-β or meso-γ-scale convective cells with the size of 20―50 km. The heavy rain band in the middle reaches of the Yangtze River ex-ists in a low-level wind shear. The interaction between southwest low-level jet on the southern side of wind shear and east wind on the northern side formed the updraft. The wind disturbance, wind shear and convergence generate the convective action. The new cell developed in right rear flank of rain band and moved to the southwest wind area, where the vapor is abundant. This kind of echo can last a long time and developed well. The strong convective echoes are often ac-companied by the meso-γ-scale vortex and convergence.

关键词： heavy rainfall in Meiyu front, mesoscale structure, dual-Doppler radar, middle reaches of the Yangtze River, low-level jet.

Lithospheric seismic fabrics of Sulu ultrahigh-pressure metamorphic belt

在线全文

学校读者我要写书评

暂无评论

Science China Earth sciences 2005年第5期48卷 585-600页

作者： YANG Wencai 1., YANG Wuyang 1., JIN Zhenmin 2 & CHENG Zhenyan 1.1. institute of Geology, Chinese {1. of Geological sciences, Beijing 1.0037, China 2. China University of Geosciences, Wuhan 430074, China 1. Chinese academy of Geological {1. Institute of Geology 100037 Beijing China 2. China University of Geosciences 430074 Wuhan China

Calibration of seismic reflectors appearing in the crust of the Chinese continent sci- entific drilling site can be completed through the correlation studies between direct evidences, such as the drill cores, and geophysical signatures; therefore the interpretation of geophysical data could produce reliable results of crustal structure and composition. On the other hand, there are two Cenozoic volcanoes close to the scientific drilling site; analyzing composition of xenoliths existent in the volcanoes and evaluating their seismic velocities can also offer information about the mantle and lower crust. After the calibration via cores and well-logging data, the seismic re- flectors appearing in the UHP belt can be caused by lithological changes within the UHP rock slice, ductile shearing rock-suites, and later fracture zones. Among these sources, ductile shearing resulted in displacement and detachment of original rock-sheets, producing some rock-interbeds of several hundred meters thick that are named the ductile shearing rock-suites. A suite consists of mylonized gneiss and eclogite slices that underwent shearing, becoming the major mechanism responsible to generate regional strong reflections. The UHP rock-slice is characterized by complicated structures and high density, high seismic velocity and high electri- cal resistivity, its thickness is usually less than 1. km. Velocity and density of the gneiss-layer beneath gradually tend to normal with increasing depth. Based on the xenoliths we can infer that the middle crust contains a lot of gneisses, and the lower crust consists of different granulites. The lithospheric mantle has multi-layer structures and consists mainly of spinal lherzolite and harzburgite, implying late Mesozoic lithospheric thinning. The seismic fabrics with different ori- gins were possible products of different geodynamic processes. For instance, the UHP rock-slice was produced by the UHP metamorphic process and the exhumation of subducted supe

关键词： deep seismic reflection, ultrahigh-pressure belt, Sulu China, calibration of reflectors, lithospheric fabrics.

Geochemical simulation of the formation of brine and salt minerals based on Pitzer model in Caka Salt Lake

在线全文

学校读者我要写书评

暂无评论

Science China Earth sciences 2004年第8期47卷 720-726页

作者： LIU Xingqi1. CAI Keqin2 & YU Shengsong3 1. Nanjing institute of Geography and Limnology, Chinese {1. of sciences, Nanjing 21.008, China 2. China University of Geosciences, Beijing 1.0083, China 3. institute of Salt Lakes, Chinese {1. of sciences, Xining 81.008, China 1. Nanjing institute of Geography and Limnology Chinese Academy of Sciences 210008 Nanjing China 2. China University of Geosciences 100083 Beijing China 3. institute of Salt Lakes Chinese Academy of Sciences 810008 Xining China

The geochemical simulation of the formation of brine and salt minerals based on Pitzer model was made in Caka Salt Lake. The evolution of the mixed surface-water and the mineral sequences were calculated and compared with the hydrochemical compositions of the brine and the salt minerals of the deposit in Caka Salt Lake. The results show that the formation temperature of the lake is between 0°C and 5°C, which is well identical with other studies. The mixing of salt-karst water with the surface waters, neglected by the former researchers, is very important to the formation of the lake, indicating that the initial waters resulting in the formation of the lake are multi-source. It is the first time to use Pitzer model in China for making geochemical simulation of the formation and evolution of inland salt lake and satisfactory results have been achieved.

关键词： Pitzer model,Caka Salt Lake,geochemical simulation,salt-karst water.

Effect of rock mass structure and block size on the slope stability——Physical modeling and discrete element simulation

在线全文

学校读者我要写书评

暂无评论

Science China(Technological sciences) 2005年第z1期48卷 1-17页

作者： LI Shihai1. LIAN Zhenzhong1.2 & J. G. Wang3 1. institute of Mechanics, Chinese {1. of sciences, Beijing 1.0080, China 2. Graduate School, Chinese {1. of sciences, Beijing 1.0060, China 3. Tropical Marine Science institute, National University of Singapore, Singapore 1.9260 Chinese Acad Sci Inst Mech Beijing 100080 Peoples R China Chinese Acad Sci Grad Sch Beijing 100060 Peoples R China Natl Univ Singapore Trop Marine Sci Inst Singapore 119260 Singapore

This paper studies the stability of jointed rock slopes by using our improved three-dimensional discrete element methods (DEM) and physical modeling. Results show that the DEM can simulate all failure modes of rock slopes with different joint configurations. The stress in each rock block is not homogeneous and blocks rotate in failure development. Failure modes depend on the configuration of joints. Toppling failure is observed for the slope with straight joints and sliding failure is observed for the slope with staged joints. The DEM results are also compared with those of limit equilibrium method (LEM). Without considering the joints in rock masses, the LEM predicts much higher factor of safety than physical modeling and DEM. The failure mode and factor of safety predicted by the DEM are in good agreement with laboratory tests for any jointed rock slope.

关键词： rock masses, slope stability, DEM simulation, block size effect, joints configuration effect, limit equilibrium method.