检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

Journal of Central South University 2011年第5期18卷 1602-1608页

作者： Lee Sang-Hyuk PARK Wook-je JUNG Dong-yean Department of electrical and electronic engineering Xi'an Jiaotong-Liverpool University Institute for Information and electronics Research Inha University253 Yonghyun-dongNam-GuIncheon402-751Korea Daeho Technology Korea Co. LtdChangwonGyeongnam641-773Korea

The similarity computations for fuzzy membership function pairs were carried *** number related knowledge was introduced,and conventional similarity was compared with distance based similarity *** usefulness of the proposed similarity measure was *** results show that the proposed similarity measure could be applied to ordinary fuzzy membership functions,though it was not easy to *** conventional results on the calculation of similarity for fuzzy membership pair,fuzzy membership-crisp pair and crisp-crisp pair were carried *** proposed distance based similarity measure represented rational performance with the heuristic point of ***,troublesome in fuzzy number based similarity measure for abnormal universe of discourse case was ***,the similarity measure computation for various membership function pairs was discussed with other conventional results.

关键词： similarity measure fuzzy number distance similarity evaluation fuzzy membership function

Adsorption and photo-catalytic properties of layered lepidocrocite-like quasi-amorphous compounds based on modified potassium polytitanates

在线全文

学校读者我要写书评

暂无评论

Particuology 2014年第6期12卷 22-28页

作者： e.V.Tretyachenko A.V.Gorokhovsky G.y.yurkov F.S.Fedorov M.A.Vikulova D.S.Kovaleva e.e.Orozaliev Department of Chemistry Saratov State Technical University

TiO2 compounds possess relatively high adsorption abilities and exhibit high photocatalytic activities that exhibit potential for the destruction of organic pollutants in natural and waste *** potassium polytitanates modified using transition metals and their oxides/hydroxides generate new nanomaterials that operate in the visible spectral *** study presents the synthesis and investigation of the structure,composition and photocatalytic activity of powdered nanoscale quasi-amorphous potassium polytitanates particles modified with iron,zinc,copper,cobalt and nickel sulfate in aqueous *** of the powders investigated in this work exhibit a high adsorption capacity for methylene blue dye（15-20mg/g） related to the welldeveloped surface of the layered potassium polytitanate *** transition metals and their oxides/hydroxides influences the electronic structure of the obtained systems.A high photocatalytic activity was observed for systems containing iron,zinc,nickel and their oxides/hydroxides in the ultraviolet and visible ranges.

关键词： Layered potassium titanate Chemical modification Heterostructured particles Photocatalytic activity Adsorption

Coherent States and a Path Integral for the Relativistic Linear Singular Oscillator

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2008年第2期49卷 315-318页

作者： S.M.Nagiyev e.I.Jafarov M.y.efendiyev Institute of Physics Azerbaijan National Academy of SciencesJavid av.33AZ1143BakuAzerbaijan Institute of Physics Azerbaijan National Academy of SciencesJavid av.33AZ1143BakuAzerbaijan Department of Applied Mathematics and Computer ScienceGhent UniversityKrijgslaan 281-S9B-9000 GentBelgium IAzerbaijan Cooperation University Narimanov av.86AZ1106BakuAzerbaijan

The SU（1,1） coherent states for a relativistic model of the linear singular oscillator are considered. The corresponding partition function is evaluated. The path integral for the transition amplitude between SU（1,1） coherent states is given. Classical equations of the motion in the generalized curved phase space are obtained. It is shown that the use of quasiclassical Bohr Sommerfeld quantization rule yields the exact expression for the energy spectrum.

关键词： relativistic linear singular oscillator SU(1 1) coherent states path integral

Primary pancreatic hydatid disease associated with acute pancreatitis

在线全文

学校读者我要写书评

暂无评论

Hepatobiliary & Pancreatic Diseases International 2010年第4期9卷 441-442页

作者： Karakas e Tuna y Basar  Kklü S Department of Radiology Sanllurfa education and Research Hospital Sanllurfa Turkey Department of Gastroenterology Akdeniz University Faculty of Medicine Department of Gastroenterology Dlskapl education and Research Hospital Department of Gastroenterology Ankara education and Research Hospital

The editor welcomes submissions for possible publication in the Letters to the editor section. Letters commenting on an article published in the Journal or other interesting pieces will be considered if they are received within 6 weeks of the time the article was published. Authors of the article being commented on will be given an opportunity to offer a timely response to the letter. Authors of letters will be notified that the letter has been received. Unpublished letters cannot be returned.

关键词： Primary pancreatic hydatid disease associated with acute pancreatitis

Atom probe tomographic observation of hydrogen trapping at carbides/ferrite interfaces for a high strength steel

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2018年第8期34卷 1344-1348页

作者： y.F.Jiang B.Zhang y.Zhou J.Q.Wang e.-H.Han W.Ke CAS Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and engineering University of Science and Technology of ChinaShenyang 110016China

A three-dimensional atom probe （3DAP） technique has been used to characterize the hydrogen dis- tribution on carbides for a high strength AISI 4140 steel. Direct evidence of H atoms trapped at the carbide/ferrite interfaces has been revealed by 3DAP mapping. Hydrogen is mainly trapped on car- bide/ferrite interfaces along the grain boundaries. Slow strain rate tensile （SSRT） testing shows that the AIS14140 steel is highly sensitive to hydrogen embrittlement. The corresponding ffactographic mor- phologies of hydrogen charged specimen exhibit brittle fracture feature. Combined with these results, it is proposed that the hydrogen trapping sites present in the grain boundaries are responsible for the hydrogen-induced intergranular fracture of AISI 4140. The direct observation of hydrogen distribution contributes to a better understanding of the mechanism of hydrogen embrittlement.

关键词： Low alloy steel TeM Interfaces Hydrogen embrittlement

Molecular Dynamics Simulation of Behaviours of Non-Polar Droplets Merging and Interactions with Hydrophobic Surfaces

在线全文

学校读者我要写书评

暂无评论

Journal of Bionic engineering 2008年第4期5卷 271-281页

作者： y.y. yan C.y. Ji School of the Built environment University of Nottingham Nottingham NG7 2RD UK

This paper presents a molecular dynamics simulation of the behaviours of non-polar droplets merging and also the fluid molecules interacting with a hydrophobic surface. Such behaviours and transport phenomena are popular in general microchannel flow boiling and two-phase flow. The droplets are assumed to be composed of Lennards-Jones type molecules. Periodic boundary conditions are applied in three coordinate directions of a 3-D system, where there exist two liquid droplets and their vapour. The two droplets merge when they come within the prescribed small distance. The merging of two droplets apart from each other at different initial distances is tested and the possible larger （or critical） non-dimensional distance, in which droplets merging can occur, is discussed. The evolution of the merging process is simulated numerically by employing the Molecular Dynamics （MD） method. For interactions with hydrophobic solid wall, a system with fluid confined between two walls is used to study the wetting phenomena of fluid and solid wall. The results are compared with those of hydrophilic wall to show the unique characteristics of hydrophobic interactions by microscopic methods.

关键词： molecular dynamics simulation mist flow droplets merging hydrophobic wetting

Hydrologic and water quality performance of a laboratory scale bioretention unit

在线全文

学校读者我要写书评

暂无评论

Frontiers of environmental Science & engineering 2018年第1期12卷 159-167页

作者： Jun Xia Hongping Wang Richard L. Stanford Guoyan Pant shaw L. yus State Key Laboratory of Water Resources ＆ Hydropower engineering Sciences Wuhan University Wuhan 430072 China Key Laboratory of Water Cycle ＆ Related Land Surface Processes Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China Department of environmental engineering School of Resources and Environmental Science Wuhan University Wuhan 430079 China ATR Associates Inc. Strasburg VA 22657 USA Department of Civil and environmental engineering University of Virginia Charlottesville VA 22903 USA

A bioretention unit （BRU） or cell is a green infrastructure practice that is widely used as a low impact development （LID） technique for urban stormwater management. Bioretention is considered a good fit for use in China＇s sponge cit.y construction,projects. However, studies on biooretention design, whichincorporates site-specific environmental and social-economic conditions in China are still very much needed. In this study, an experimental BRU, consisted of two cells planted with Turf grass and Buxus shfica,was tested with eighteen synthesized storm events. Three levels （high, median, low） of flows and concentrations of pollutants （TN, TP and COD） were fed to the BRU and the performance of which was examined. The results showed that the BRU not only delayed and lowered the peak flowsbut also removed TN, TP and COD in various ways and to different extents. Under the high, medium and low inflow rate conditions, the outflow peaks were delayed for at least 13 minutes and lowered at least 52%. The two cells stored a maximum of 231 mm and 265 mm for turf grass and Buxus sinica, respectively. For both cells the total depth available for storage was 1,220 mm, including a maximum 110 mm deep ponding area. The largest infiltrate rate was 206 mrn/h for both cells with different plants. For the eighteen events, TP and COD were removed at least 60% and 42% by mean concentration, and 65% and 49% by total load, respectively. In the reservoir layer, the efficiency ratio of removal of TN, TP and COD were 52%, 8% and 38%, respectively, within 5 days after runoff events stopped. Furthermore, the engineering implication of the hydrological and water quality performances in sponge city construction projects is discussed.

关键词： Bioretention unitSponge cityStormwater runoffPeak reductionPollutant removal

Trends of Regional Precipitation and Their Control Mechanisms during 1979–2013

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

Advances in Atmospheric Sciences 2016年第2期33卷 164-174页

作者： Run LIU shaw Chen LIU Chein-Jung SHIU Jun LI yuanhang ZHANG State Key Joint Laboratory of environmental Simulation and Pollution Control College of Environmental Sciences and Engineering Peking University Research Center for environmental Changes Academia Sinica Department of Atmospheric Science NCU

Trends in precipitation are critical to water resources. Considerable uncertainty remains concerning the trends of regional precipitation in response to global warming and their controlling mechanisms. Here, we use an interannual difference method to derive trends of regional precipitation from GPCP （Global Precipitation Climatology Project） data and MeRRA （Modern- era Retrospective Analysis for Research and Applications） reanalysis in the near-global domain of 60~ S-60~N during a major global warming period of 1979-2013. We find that trends of regional annual precipitation are primarily driven by changes in the top 30% heavy precipitation events, which in turn are controlled by changes in precipitable water in response to global warming, i.e., by thermodynamic processes. Significant drying trends are found in most parts of the U.S. and eastern Canada, the Middle east, and eastern South America, while significant increases in precipitation occur in northern Australia, southern Africa, western India and western China. In addition, as the climate warms there are extensive enhancements and expansions of the three major tropical precipitation centers-the Maritime Continent, Central America, and tropical Africa-leading to the observed widening of Hadley cells and a significant strengthening of the global hydrological cycle.

关键词： regional precipitation global warming water resources

Simulation of plastic deformation induced texture evolution using the crystallographic homogenization finite element method

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Solida Sinica 2017年第1期30卷 51-63页

作者： y.P.Chen y.y.Cai Department of Mechanics Huazhong University of Science and Technology

A semi-implicit elastic/crystalline viscoplastic finite element（Fe） method based on a ＂crystallographic homogenization＂ approach is formulated for a multi-scale analysis. In the formulation, the asymptotic series expansion is introduced to define the displacement in the micro-continuum. This homogenization Fe analysis is aimed at predicting the plastic deformation induced texture evolution of polycrystalline materials, the constituent microstructure of which is represented by an assembly of single crystal grains. The rate dependent crystal plasticity model is adopted for the description of microstructures. Their displacements are decomposed into two parts： the homogenized deformation defined in the macrocontinuum and the perturbed one in the micro-continuum. This multi-scale formulation makes it possible to carry out an alternative transition from a representative micro-structure to the macro-continuum. This homogenization procedure satisfies both the compatibility and the equilibrium in the micro-structure. This developed code is applied to predict the texture evolution, and its performance is demonstrated by the numerical examples of texture evolution of FCC polycrystalline metals.

关键词： Homogenization Local periodicity Crystalline plasticity Texture Finite element