检索结果-南通市图书馆

Characterization of radionuclide transport in subsurface environments using naturally- occurring uranium-series radioisotopes as an ananolog

在线全文

学校读者我要写书评

暂无评论

Acta Geochimica 2006年第S1期 248-248页

作者： teh-lung ku V. Todd M. T. Murrell J. A. RODRíGUEZ J. C. DINSMOOR A. J. MITCHELL Department of Earth Sciences University of Southern California Los Angeles CA 90089-0740 USA Los Alamos National Laboratory Los Alamos NM 87545 USA Centro de Investigación Sobre Sequía del Instituto de Ecología Aldama 32900 Mexico

Characterization of radionuclide transport in subsurface environments using naturally- occurring uranium-series radioisotopes as an ananolog

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal Of Geochemistry 2006年第B8期25卷 248-248页

作者： Shangde LUO teh-lung ku V. Todd M. T. Murrell J. A. RODRIGUEZ J. C. DINSMOOR A.J. MITCHELL Department of Earth Sciences National Cheng-Kung University Tainan 701 Taiwan R.O.C. Department of Earth Sciences University of Southern California Los Angeles CA 90089-0740 USA Los Alamos National Laboratory Los Alamos NM87545 USA Centro de Investigación Sobre Sequla del Instituto de Ecologla Aldama 32900 Mexico

Reply to the comment of Cheng et al.

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2010年第32期55卷 3738-3740页

作者： ZHANG DeEr LI Hong-Chun ku teh-lung LU LongHua National Climate Center Beijing 100081 China Department of Earth Sciences Cheng-Kung University Tainan 70101 Taiwan China Department of Earth Sciences University of Southern California Los Angeles CA 90089 USA Chinese Academy of Meteorological Sciences Beijing 100081 China

We thank Cheng et al. for their interest in our paper 'On linking climate to Chinese dynastic change: Spatial and temporal variations of of monsoonal rain' [1]. Our paper was written largely as a response to the sugge... 详细信息

关键词：评论时空变化气候变化季风

Age dating of lacustrine sediments in Lake Tianshuihai of the Tibetan Plateau by using U-series isochron method and its significance

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2001年第10期46卷 862-867页

作者： ZHU Zhaoyu ku teh-lung LUO Shangde ZHOU Houyun WEN Qizhong LI Shijie LI Bingyuan LI Hongchun Guangzhou Institute of Geochemistry Chinese Academy of SciencesGuangzhou 510640China University of Southern California Los Angeles 90089-0740USA Lanzhou Institute of Glaciology and Cryopetology Chinese Academy of SciencesLanzhou 710000China Institute of Geography Chinese Academy of SciencesBeijing 100101China

The age of the clastic-clay sediments with varied content of carbonate in core TS95 taken from the Lake Tianshuihai in the northwest of the Tibetan Plateau was determined successfully by using the total sample dissolution U-series isochron method for the first time. With this method, the serial absolute timescale (isotope time scale) covered the last 240 ka in the main body of the Tibetan Plateau with a sea level up to 4000 m is also established for the first time, thereby laying the foundation for the research on the paleo-climate and palaeoenvironment in the Lake Tianshuihai region as well as the relationship between evolution of the Tibetan Plateau and global changes. In addition to a brief introduction of the basic principles, the procedures of experiments, and the results, this note also presents the adaptability and superiority of this method as well as its possible problems.

关键词： total sample dissolution (TSD) U-series isochron lacustrine sediments Tibetan Plateau.

Reply to the comment of Cheng et al.

在线全文

学校读者我要写书评

暂无评论

Science Bulletin 2010年第32期 3739-3741页

作者： ku teh-lung Department of Earth Sciences University of Southern California

We thank Cheng et al. for their interest in our paper "On linking climate to Chinese dynastic change: Spatial and temporal variations of of monsoonal rain" [1]. Our paper was written largely as a response to the sugge... 详细信息

关键词： Zhang Reply to the comment of Cheng et al EASM

The Mystery 40 Hz:Unraveling the Efficacy of Rhythmic Stimulation in Alzheimer's Disease

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Neuroscience Bulletin 2024年第6期40卷 831-834页

作者： Yixuan ku Guangdong Provincial Key Laboratory of Brain Function and Disease Center for Brain and Mental Well-beingDepartment of PsychologySun Yat-sen UniversityGuangzhou510006China Peng Cheng Laboratory Shenzhen518000China

Promises and Challenges of Rhythmic *** advances in research have made significant strides in understanding the potential of 40 Hz rhythmic optogenetic stimulation for the treatment of Alzheimer's disease(AD).A pivotal study conducted by Iaccarino et al.(2016)unveiled that targeted stimulation of interneurons at this specific frequency results in a remarkable reduction ofβ-amyloid levels in a mouse model of AD[1].

关键词： stimulation Alzheimer

Selective reduction of NO by photo-SCR with ammonia in an annular fixed-film photoreactor

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2012年第2期6卷 149-155页

作者： YiangChen CHOU Young ku Department of Chemical Engineering Taiwan University of Science and Technology Taipei 10607 China

Gaseous NO was photocatalytically reduced at room temperature by photo-assisted selective catalytic reduction （photo-SCR） with ammonia over TiO2 in this study. NO reduction efficiency and N2 selectivity were determined from gases composition at the outlet stream of photoreactor. Effect of operating conditions, e.g. light intensity and inlet concentrations of ammonia and oxygen, on the NO reduction efficiency and N2 selectivity were discussed to determine the feasible operating condition for photocatalytic reduction of NO. Experimental results showed that selective catalytic reduction of NO with ammonia over TiO2 in the presence of oxygen was a spontaneous reaction in dark. The photoirradiation on the TiO2 surface caused remarkable photocatalytic reduction of NO to form N2, NO2, and N20 under 254 nm UV illuminations, while almost 90% of N2 selectivity was achieved in this study. The ammonia and oxygen molecules played the roles of reductant and oxidant for NO reduction and active sites regeneration, respectively. The reduction of NO was found to be increased with the increase of inlet ammonia and oxygen concentrations until specific concentrations because of the limited active sites on the surface of TiO2. The kinetic model proposed in this study can be used to reasonably describe the reaction mechanism of photo-SCR.

关键词： photo-SCR photocatalysis NO reduction,Eley-Rideal model

SOLUTION OF THE ENSO DELAYED OSCILLATOR WITH HOMOTOPY ANALYSIS METHOD

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 Hydrodynamics 2009年第1期21卷 131-135页

作者： WU Zi-ku School of Science Qingdao Agriculture University Qingdao 266109 China

An ENSO delayed oscillator is considered. The E1 Nino atmospheric physics oscillation is an abnormal phenomenon involved in the tropical Pacific ocean-atmosphere interactions. The conceptual oscillator model should consider the variations of both the eastern and western Pacific anomaly patterns. Using the homotopy analysis method, the approximate expansions of the solution of corresponding problem are constructed. The method is based on a continuous variation from an initial trial to the exact solution. A Maclaurin series expansion provides a successive approximation of the solution through repeated application of a differential operator with the initial trial as the first term. This approach does not require the use of perturbation parameters and the solution series converges rapidly with the number of terms. Comparing the approximate analytical solution by homotopy analysis method with the exact solution, we can find that the homotopy analysis method is valid for solving the strong nonlinear ENSO delayed oscillator model.

关键词： ENSO delayed oscillator homotopy analysis method strong nonlinear

Mixture flow of particles and power-law fluid in round peristaltic tube

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 2019年第6期40卷 805-822页

作者： Hailin YANG Jianzhong LIN Xiaoke ku Institute of Fluid Engineering School of Aeronautics and AstronauticsZhejiang University

The erythrocyte and blood flowing in the blood vessel can be treated as the two-phase flow of the mixture of particles and a power-law fluid in a peristaltic *** the present work, the peristaltic transport of a power-law fluid and the suspension of particles in a tube is investigated by a perturbation method using the long wavelength approximation. The influence of different parameters on the velocity profile and streamlines is explored. Results show that there is a deflection of the flow field when the power-law index n = 0.5 or 1.5 compared with the Newtonian fluid where the trapping zone is symmetric to a certain cross section. The flux rate and reflux of the material are identified,and the conditions under which the reflux appears are determined. Moreover, a reflux phenomenon occurs near the wall. The trapping zone is related to not only the tube geometry and the flow flux but also the fluid properties. Both the length and width of the trapping zone increase with an increase in θ or φ. The trapping zone is more difficult to produce in the shear-thinning fluid than the shear-thickening fluid.

关键词： peristaltic transport two-phase flow power-law fluid perturbation method trapping phenomenon