检索结果-南通市图书馆

Esophageal cancer:diagnosis and management

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Cancer 2010年第10期29卷 843-854页

作者： Steven H.Lin joe y.chang Department of Radiation Oncology University of Texas M.D.Anderson Cancer Center

Esophageal cancer is the 7th leading cause of cancer deaths *** squamous cell carcinoma is the most prevalent histology.internationally.adenocarcinoma of the distal esophagus accounts for nearly.50% of cases in developed countries due to the differences in the etiologic factors such as gastroesophageal reflux disease(GERD) and obesity.that *** surgery.is the mainstay.of treatment of this disease,the utilization of chemoradiation,eitherused postoperatively.or neoadjuvantly.has become a standard practice in the United *** is the optimal management approach is still an area of contention,however,and may.be different in different regions around the *** article reviews some of these controversies,including the role for surgery.in patients treated with definitive *** the end,we will also outline recommendations regarding radiotherapy.procedures and techniques.

关键词：食管癌管理诊断放射治疗鳞状细胞癌发达国家组织学利用率

New approaches to water purification for resource- constrained settings： Production of activated biochar by.chemical activation with diammonium hy.rogenphosphate

在线全文

学校读者我要写书评

暂无评论

Frontiers of Chemical Science and Engineering 2018年第1期12卷 194-208页

作者： Mohit Nahata chang y. Seo Pradeep Krishnakumar Johannes Schwank Department of Chemical Engineering University of Michigan-Ann Arbor Ann Arbor MI 48109 USA

A significant portion of the world＇s population does not have access to safe drinking water. This problem is most acute in remote, resource-constrained rural settings in developing countries. Water filtration using activated carbon is one of the important steps in treating con- taminated water. Lignocellulosic biomass is generally.available in abundance in such locations, such as the African rain forests. Our work is focused on developing a simple method to sy.thesize activated biochar from locally.available materials. The preparation of activated biochar with diammonium hy.rogenphosphate （DAP） as the activating agent is explored under N2 flow and air. The study. carried out with cellulose as a model biomass, provides some insight into the interaction between DAP and biomass, as well as the char forming mechanism. Various characterization techniques such as N2 phy.isorption, X-ray.photoelectron spectroscopy. scanning electron microscopy. transmission electron microscopy.and Raman spectroscopy.are utilized to compare the properties between biochar formed under nitrogen and partial oxidative conditions. At a temperature of 450 ℃, the loading of DAP over cellulose is sy.tematically.varied, and its effect on activation is examined. The activated biochar samples are predominantly.microporous in the range of concentrations studied. The interaction of DAP with cellulose is investigated and the nature of bonding of the heteroatoms to the carbonaceous matrix is elucidated. The results indicate that the quality.of biochar prepared under partial oxidation condition is comparable to that ofbiochar prepared under nitrogen, leading to the possibility.of an activated biochar production scheme on a small scale in resource-constrained settings.

关键词： cellulose DAP activation heteroatom,microporous

Development of materials design tool and its application in Pb-free micro-solders in electronic package

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(Technological Sciences) 2010年第6期53卷 1495-1500页

作者： OHNUMA Ikuo KAINUMA Ry.suke ISHIDA Kiy.hito chang Austin y. Department of Materials Science Graduate School of EngineeringTohoku UniversitySendai 980-8579Japan Department of Materials Science and Engineering University of WisconsinMadisonUSA

A materials design tool for developing Pb-free soldering alloy. in electronic package was developed based on comprehensive experimental data of phase equilibria and thermody.amic properties data accumulated with the CALPHAD (calculation of phase diagrams) method and contains 10 elements,namely.Ag,Au,Bi,Cu,In,Ni,Sb,Sn,Zn and *** can handle the calculation of phase diagrams in all combinations of these elements and all composition *** addition,based on this tool,the liquidus,solidus,phase fractions and constitutions,equilibrium and non-equilibrium solidification behavior,surface tension and viscosity.of liquid,diffusion reactions and microstructural evolution,*** be *** examples of the calculation and application of this tool are *** design tool is expected to be a powerful tool for the development of Pb-free solders,as well as for promoting the understanding of the interfacial phenomena between Cu substrate and Pb-free solders in electronic packaging technology.

关键词： Pb-free solders thermody.amic database calculation of phase diagram phase field method interfacial reaction

Behavior of Transversal Crack on Slab Corner During V-H Rolling Process

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2006年第6期13卷 31-37页

作者： y. Hai-liang LIU Xiang-hua LI chang-sheng y. Kusaba State Key.Laboratory.of Rolling and Automation Northeastern University Shenyang 110004 Liaoning China Sumitomo Metal Industries Ltd Fuso-cho 660 AMAGASAKI Japan

The behavior of transversal cracks on the surface of the slab corner during vertical and horizontal （V-H） rolling process with flat vertical roll and groove vertical roll was simulated by.explicit dy.amic finite element method. The closure and growth of crack and the contact pressure on surfaces of the crack in contacting zone between slab and roll during rolling process were analy.ed. The results showed that during vertical rolling process, when the groove vertical roll is used, the maximum contact pressure on surfaces of the crack is 115 MPa, and the closure of crack is stable when the flat vertical roll is used, the maximum contact pressure on surfaces of the crack is 70 MPa, and it fluctuates greatly. During horizontal rolling process, when groove vertical roll is used, the contact pressure becomes zero which may.accelerate the growth of crack when flat vertical roll is used, there is still contact pressure. The cal culated results are in good agreement with the results of test.

关键词： slab crack V-H rolling process FEM

Influence of Co Content on Raman and Photoluminescence Spectra of Co Doped ZnO Nanowires

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2012年第4期28卷 313-316页

作者： y.Q. chang P.W. Wang S.L. Ni y. Long X.D. Li School of Materials Science anti Engineering University of Science and Technology Beijing Beijing 100083 China Department of Phy.ics National Key Laboratory of Mesoscopic Physics Peking University Beijing 100871 China

Co doped ZnO nanowires with different Co contents have been fabricated by.a chemical vapor deposition method. X-ray.diffraction results show that all the samples are of single phase and cry.tallize in wurtzite ZnO structure. The lattice parameter a increases with increasing Co content, while the parameter c has no obvious change with increasing Co. Raman spectra show that the nonpolar E2（High） mode becomes broad and weak with the doping of Co, which indicates that the incorporation of Co causes structural disorder in the cry.talline columnar ZnO lattice. The photolurninescence spectra exhibit that the position of the ultraviolet emission shifts to short wavelength and the intensity.decreases with increasing Co. The green emission is affected by.two contrary.factors. It is increased by.the introduced defects, but suppressed by.the interaction between Co doping and native defects and the later affects it more significantly.

关键词： Co doped ZnO nanowires Raman Photoluminescence Single phase

Sy.thesis and Room Temperature Ferromagnetism of Flower-shaped Mn Doped ZnO Nanostructures

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2011年第6期27卷 513-517页

作者： y.Q. chang P.W. Wang R.H. Tang Q.L. Sun y. Long School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China Department of Phy.ics National Key Laboratory of Mesoscopic Physics Peking University Beijing 100871 China

Large-scale flower-shaped Mn doped ZnO nanostructures have been grown on silicon substrates by.simple thermal evaporation at atmospheric *** flower-shaped nanostructure makes up of many.nanorods,which are rooted in one *** of X-ray.diffraction,high-resolution transmission electron microscopy.and Raman spectra results reveal that the products are of single phase with wurtzite *** mapping results show that no impurity.clusters exist in the doped *** photoluminescence spectra demonstrate that many.oxy.en vacancies exist in the doped materials,and the cry.tal quality.is improved and the content of oxy.en vacancies is decreased by.annealing *** flower-shaped Mn doped ZnO nanostructures exhibit ferromagnetic ordering above room temperature,and its magnetization is decreased by.the annealing treatment,which indicates that the magnetic behavior of the doped materials may.be related to the interaction between Mn doping and the oxy.en vacancies.

关键词： Mn doped ZnO nanomaterials Ferromagnetism Annealing treatment Chemical vapor deposition

Supplemental Materials: Realization of Quantum Maxwell's Demon with Solid-State Spins

在线全文

学校读者我要写书评

暂无评论

Chinese Phy.ics Letters 2018年第4期35卷 1-6页

作者： W.-B. Wang X.-y. chang F. Wang P.-y. Hou y.-y. Huang W.-G. Zhang X.-L. Ouy.ng X.-Z. Huang Z.-y. Zhang H.-y. Wang L. He L.-M. Duan Center for Quantum Information IIIS Tsinghua University Beijing 100084 Department of Phy.ics University of Michigan Ann Arbor Michigan 48109 USA

We report experimental realization of a quantum version of Maxwell＇s demon using solid state spins where the information acquiring and feedback operations by.the demon are achieved through conditional quantum gates.A unique feature of this implementation is that the demon can start in a quantum superposition state or in an entangled state with an ancilla observer. Through quantum state tomography. we measure the entropy.in the sy.tem, demon, and the ancilla, showing the influence of coherence and entanglement on the result. A quantum implementation of Maxwell＇s demon adds more controllability.to this paradoxical thermal machine and may.find applications in quantum thermody.amics involving microscopic sy.tems.

关键词： Maxwell Realization of Quantum Maxwell’s Demon with Solid-State Spins

同方期刊数据库

Modified cellular automaton model for modeling of microstructure and microsegregation in solidification of ternary.alloy.

在线全文

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 2006年第A2期16卷 180-185页

作者：朱鸣芳 CAO Wei-sheng CHEN Shuang-lin XIE Fan-y.u HONG Chun-py. chang y. Austin School of Materials Science and Engineering Southeast University Nanjing 210096 China Department of Materials Science and Engineering University of Wisconsin-Madison 1509 University Avenue Madison WI 53706 USA CompuTherm LLC 437 S. Yellowstone Dr. Suite 217 Madison WI 53719 USA Center for Computer-Aided Materials Processing （CAMP） Department of Metallurgical Engineering Yonsei University Shinchon-dong 134 Seodaemun-ku Seoul 120-749 Korea

A modified cellular automaton (MCA) model has been extended to the ternary.alloy.sy.tem by.coupling thermody.amic and phase equilibrium calculation engine PanEngine. In the present model the dendrite growth is driven by.the difference between the local equilibrium liquidus temperature and local actual temperature, incorporating the effect of curvature. The local equilibrium liquidus temperature is calculated with PanEngine according to the local liquid concentrations of two solutes, which are determined by.numerically.solving the species transport equation in the domain. Model validation was carried out through the comparison of the simulated values to the prediction of the Scheil model for solute profiles in the primary.dendrites. The simulated data with zero solid diffusivity.and limited liquid diffusivity.were increasingly.close to the Scheil profiles as the solidification rate decreased. The simulated microstructure and microsegregation in an Al-Cu-Mg ternary.alloy.were compared with those obtained experimentally.

关键词：三元合金体系凝固显微结构模型显微偏析细胞自动机

Sensitivity.to Acidification of Forest Soils in Two Watersheds with Contrasting Hy.rological Regimes in the Oil Sands Region of Alberta

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

Pedosphere 2007年第6期17卷 747-757页

作者： y. S. OK S. X. chang y. S. FENG Department of Renewable Resources University of Alberta Edmonton AB T6G 2E3 （Canada）. Department of Biological Environment Kangwon National University Chuncheon 200-701 （Korea）

Input of large amounts of N and S compounds into forest ecosy.tems through atmospheric deposition is a significant risk for soil acidification in the oil sands region of *** evaluated the sensitivity.of forest soils to acidification in two watersheds(Lake 287 and Lake 185)with contrasting hy.rological regimes as a part of a larger project assessing the role of N and S cy.ling in soil acidification in forest *** six forest soil samples were collected from the two watersheds by.horizon from 10 monitoring plots dominated by.either jack pine(Pinus banksiana)or aspen(Populus tremuloides).Soils in the two watersheds were extremely.to moderately.acidic with pH(CaCl_2)ranging from 2.83 to *** acid-base chemistry.variables such as pH,base saturation,Al saturation,and acid-buffering capacity.measured using the acetic acid equilibrium procedure indicated that soils in Lake 287 were more acidified than those in Lake 185. Acid-buffering capacity.decreased in the order of forest floor>subsurface mineral soil>surface mineral *** most dramatic differences in percent Ca and Al saturations between the two watersheds were found in the surface mineral soil *** Ca and Al saturation in the surface mineral soil in Lake 287 were 15% and 70%,respectively.the percent Ca saturation value fell within a critical range proposed in the literature that indicates soil *** results suggest that the soils in the two watersheds have low acid buffering capacity.and would be sensitive to increased acidic deposition in the region.

关键词： acid-buffering capacity Al saturation base saturation pH soil acidification