检索结果-南通市图书馆

Synergistic reaction behavior of pyrolysis and reduction of briquette prepared by weakly caking coal and metallurgical dust

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

Journal of Iron and Steel Research International 2023年第7期30卷 1367-1380页

作者： Zheng-jian Liu Ming-hui Cao jian-liang Zhang Run-sheng Xu Yao-zu Wang Ji-yong Yu Yu-chen Zhang School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

Co-carbonization of weakly caking coal and zinc-containing dust to prepare highly reactive ferro-coke and collaboratively recover zinc powder is one of the feasible ways for steel enterprises to recycle zinc-containing *** pyrolysis mass loss behavior of adding blast furnace dust with different zinc contents to different ferro-coke materials was systematically studied by thermogravimetry and differential thermogravimetry analysis,and the kinetic mechanism of pyrolysis-reduction reaction of hybrid briquette was *** results of thermogravimetric curve analysis show that the addition of zinc oxide to the sample has no significant effect on the mass loss rate of the sample below 580℃,and the pyrolysis mass loss of zinc oxide mainly occurs between 800 and 1000℃.Kinetic analysis results show that the pyrolysis of zinc-containing samples is controlled by chemical reactions below 580℃.The reaction at 580–700℃ is controlled by the nucleation and growth model,and that above 700℃ is mainly controlled by *** results of X-ray diffraction analysis show that the pyrolysis process can effectively remove zinc oxide from ferro-coke.

关键词： Zinc-containing dust Weakly caking coal Ferro-coke Pyrolysis Reduction Thermal reaction analysis Kinetic analysis

Individualized proximal margin for early gastric cancer patients

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

World Journal of Gastroenterology 2014年第44期20卷 16793-16794页

作者： Xin-zu Chen Wei-Han Zhang jian-Kun Hu Department of Gastrointestinal Surgery West China Hospital Sichuan University

There is no robust evidence to define a safe proximal margin by distance for early gastric cancer (EGC). The discussion on resection margin should not only focus on the oncologic safety, but also the postgastrectomy quality of life. The distance 1-10 mm is only acceptable for those endoscopic treatment fit EGC patients. For endoscopic unfit EGC cases, if the borderline of tumor is able to be clearly determined intraoperatively, the distance 1-3 cm is recommended for proximal resection margin. If there is any uncertainty on the tumor borderline, the distance 3-5 cm should be considered for proximal margin. (C) 2014 Baishideng Publishing Group Inc. All rights reserved.

关键词： Early gastric cancer Gastrectomy Margin Oncologic safety Quality of life

Quantitative Structure-property Relationship Studies on Amino Acid Conjugates of Jasmonic Acid as Defense Signaling Molecules

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

Journal of Integrative Plant Biology 2009年第6期51卷 581-592页

作者： zu-Guang Li Ke-Xian Chen Hai-Ying Xie jian-Rong Gao College of Chemical Engineering and Materials Science Zhejiang University of Technology Hangzhou 310014 China

Jasmonates and related compounds, including amino acid conjugates of jasmonic acid, have regulatory functions in the signaling pathway for plant developmental processes and responses to the complex equilibrium of biotic and abiotic stress. But the molecular details of the signaling mechanism are still poorly understood. Statistically significant quantitative structure-property relationship models （r^2 〉 0.990） constructed by genetic function approximation and molecular field analysis were generated for the purpose of deriving structural requirements for lipophilicity of amino acid conjugates of jasmonic acid. The best models derived in the present study provide some valuable academic information in terms of the 2/3D-descriptors influencing the lipophilicity, which may contribute to further understanding the mechanism of exogenous application ofjasmonates in their signaling pathway and designing novel analogs of jasmonic acid as ecological pesticides.

关键词： amino acid conjugates defense signaling molecules jasmonic acid n-octanol/water partition coefficient quantitative structure-propertyrelationship.

Particle size distribution and characteristics of polycyclic aromatic hydrocarbons during a heavy haze episode in Nanjing,China

在线全文

学校读者我要写书评

暂无评论

Particuology 2015年第1期13卷 127-134页

作者： Qingzi Meng Shuxian Fan Jiabao He jian Zhang Yu Sun Yue Zhang Fan zu Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration Nanjing University of Information Science and Technology Department of Atmospheric Physics Nanjing University of Information Science and Technology jiangsu Institute of Meteorological Sciences

A heavy haze episode caused by agricultural burning occurred in Nanjing from November 7 to November 8, 2009. PM10 samples were collected on normal and hazy days from November I to November 14, 2009 at both city and suburban sites of Nanjing. Sixteen PAHs were measured during the day and at night. The results show that the concentrations of the particles were as high as 579.55 and 573.43 μg/m^3 during the haze episode at the city and suburban sites, respectively, 3-4 times higher than those on a normal day. The proportions of fine particles during the haze episode were also higher than those on a normal day. The changes in the concentrations of PAHs were in accordance with the concentrations of the particles. High- molecular-weight PAHs composed approximately 80% of the total PAHs on normal days and during the haze episode. The concentration of PAHs in fine fractions significantly increased during the haze episode, and this increase was most obvious at night at the city site, The proportion of total carcinogenic PAHs in fine particles was relatively high during the haze episode at both sampling sites, particularly at night at the city site.

关键词： Polycyclic aromatic hydrocarbons Agricultural burning Haze episode Particle size distribution Meteorological conditions Nanjing

Transport in electron–photon systems

在线全文

学校读者我要写书评

暂无评论

Frontiers of physics 2023年第4期18卷 129-175页

作者： jian-Sheng Wang Jiebin Peng zu-Quan Zhang Yong-Mei Zhang Tao Zhu Department of Physics National University of SingaporeSingapore 117551Republic of Singapore Center for Phononics and Thermal Energy Science China-EU Joint Center for NanophononicsShanghai Key Laboratory of Special Artificial Microstructure Materials and TechnologySchool of Physics Science and EngineeringTongji UniversityShanghai 200092China Department of Physics Zhejiang Normal UniversityJinhua 321004China College of Physics Nanjing University of Aeronautics and AstronauticsNanjing 210016China School of Electronic and Information Engineering Tiangong UniversityTianjin 300387China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China

We review the description and modeling of transport phenomena among the electron systems coupled via scalar or vector *** consists of three *** first part is about scalar photons,i.e.,Coulomb *** second part is with transverse photons described by vector *** third part is onϕ=0 or temporal gauge,which is a full theory of the *** use the nonequilibrium Green’s function(NEGF)formalism as a basic tool to study steady-state *** with local equilibrium it is equivalent to the fluctuational electrodynamics(FE),the advantage of NEGF is that it can go beyond FE due to its *** have given a few examples in the review,such as transfer of heat between graphene sheets driven by potential bias,emission of light by a double quantum dot,and emission of energy,momentum,and angular momentum from a graphene *** of these calculations are based on a generalization of the Meir–Wingreen formula commonly used in electronic transport in mesoscopic systems,with materials properties represented by photon self-energy,coupled with the Keldysh equation and the solution to the Dyson equation.

关键词： quantum transport thermal radiation scalar and vector photons nonequilibrium Green's function

PR-segment depression during cryoballoon ablation of atrial fibrillation: a case report

在线全文

学校读者我要写书评

暂无评论

Journal of Geriatric Cardiology 2019年第10期16卷 789-792页

作者： Ming LIANG yang LV zu-Lu WANG Gui-Tang yang Ming-Yu SUN Zhi-Qing JIN jian DING Ya-Ling HAN Department of Cardiology General Hospital of Northern Theater Command

Cryoballoon ablation has been widely used in the treatment of atrial fibrillation (AF).[1] The main complications of the procedure include pericardial tamponade, pulmonary vein stenosis, and atrial esophageal leakage,... 详细信息

关键词： Atrial fibrillation Chest pain Cryoballoon ablation

Electropolishing of titanium alloy under hydrodynamic mode

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2016年第11期59卷 1525-1528页

作者： Pei Huang Junhui Lai Lianhuan Han Fang-zu yang Li-Min jiang jian-Jia Su Zhao-Wu Tian Zhong-Qun Tian Dongping Zhan State Key Laboratory of Physical Chemistry of Solid Surfaces Department of Chemistry College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China School of Material Science and Engineering Nanchang Hangkong UniversityNanchang 330034China

Titanium(Ti) alloys are widely used in aerospace industry due to the low density and high corrosion resistance. However, machining and polishing remain great challenges because of the hardness and chemical stability. With a home-made electrochemical machining workstation, cyclic voltammetry is performed at a wide potential range of [0 V, 20 V] to record the details of passivation and depassivation processes under a hydrodynamic mode. The results show that the thickness of viscous layer formed on the alloy surface plays a crucial effect on the electropolishing quality. The technical parameters, including the mechanical motion rate, polishing time and electrode gap, are optimized to achieve a surface roughness less than 1.9 nm, which shows a prospective application in the electrochemical machining of Ti and it alloys.

关键词： electrochemical machining electropolishing titanium alloy hydrodynamic viscous layer

CHARACTERIZATION OF IMPACT POLYPROPYLENE COPOLYMERS BY SOLVENT FRACTIONATION

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2012年第1期30卷 122-129页

作者： Xiao-ying Lu jian-jun Yi Shang-tao Chen Feng-hua zu Rong-bo Li Petrochina-Petrochemical Research Institute Being 100195 China

The compositional heterogeneity of two impact polypropylene copolymers（IPCs） was studied by a combinatory investigation of temperature rising elution fractionation（TREF） and solvent *** chain structures and composition of fractions obtained from solvent fractionation were examined in *** TREF results shows that there are much more E-P segmented copolymer and more uniform distribution of ethylene sequence in IPC-1,which is responsible for its better comprehensive mechanical *** fractions from hexane and heptane are ethylene-propylene rubber phase and E-P block copolymers *** result of solvent fractionation method also shows that custom hexane or heptane extractions can not extract the E-P copolymer completely.

关键词： Fractionation Impact polypropylene copolymer Composition Chain structure

Model predictive control with an on-line identification model of a supply chain unit

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science C(Computers and Electronics) 2010年第5期11卷 394-400页

作者： jian NIU zu-hua XU Jun ZHAO Zhi-jiang SHAO Ji-xin QIAN State Key Lab of Industrial Control Technology Zhejiang University Hangzhou 310027 China

A model predictive controller was designed in this study for a single supply chain unit.A demand model was described using an autoregressive integrated moving average(ARIMA) model,one that is identified on-line to forecast the future *** was used to modify the demand prediction,and profit was chosen as the control *** imitate reality,the purchase price was assumed to be a piecewise linear form,whereby the control objective became a nonlinear *** addition,a genetic algorithm was introduced to solve the *** were put on the predictive inventory to control the inventory fluctuation,that is,the bullwhip effect was *** model predictive control(MPC) method was compared with the order-up-to-level(OUL) method in *** results revealed that using the MPC method can result in more profit and make the bullwhip effect controllable.

关键词： Supply chain Model predictive control On-line identification Optimization with constraint Piecewise linear price