检索结果-南通市图书馆

Rare Metals 2018年第11期37卷 976-982页

作者： Ting-Yi Lin Xiao-Yan zhang Xin Huang Xiang-Peng Gong jun-jie zhang Xie-jun Hu College of Materials and Metallurgy Guizhou University

In this work, microarc oxidation(MAO) technology was used to form oxide ceramic coating on the surface of aluminum alloy. The combined additives nano-TiOand nano-ZnO were added into the silicate electrolyte, and the effect of the compound nano-additive on microstructure and properties of MAO coating was investigated. The results show that compared with those of the nano-additive-free coating formed on aluminum alloy, the thickness, hardness, abrasion resistance and corrosion resistance of the nano-additive-containing coating are obviously improved. The surface of coating with nanoadditive becomes smooth, dense, and there are less porosities and microcracks. Moreover, the content of crystal phase a-AlOand y-AlOincreases visibly on the nano-additive-containing MAO coatings, and new phases AlTi and ZnTiare detected in the coatings, which are mainly contributed to the excellent corrosion resistance and abrasion resistance of the film. When the contents of nano-TiOand nano-ZnO are, respectively, 4 and 2 g-L, the film has better comprehensive performance, the thickness and hardness of the film could reach 52 μm and HV 692,respectively.

关键词： Microarc oxidation Nano-TiO_2 Nano-ZnO Aluminum alloy Property

Preparation of glass–ceramics from high-chlorine MSWI fly ash by one-step process

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2021年第11期40卷 3316-3328页

作者： Shi-Zhen Zhao Xiao-Yan zhang Bo Liu jun-jie zhang Han-Lin Shen Shen-Gen zhang Institute for Advanced Materials and Technology University of Science and Technology BeijingBeijing 100083China

Municipal solid waste incinerated(MSWI) fly ash contains heavy metals and chloride,which is urgent to be disposed via an effective ***,glass-ceramics,one of the recycling waste materials based on MSWI fly ash with high chloride content,have been developed from one-step *** fly ash and waste glass have been utilized as calcium and silicon sources,***-ceramics were successfully prepared by the one-step *** is found that the increase in MSWI fly ash promotes the fracture of glass mesh(Si-O)and the generation of non-bridging oxygen,reducing the polymerization degree of glass network structure,which leads to the decrease in glass *** difference between glass transition temperature(T_(g)) and crystallization temperature(T_(c)) was narrowed,and crystallization activation energy of basic glass was reduced,which promoted *** lower crystallization activation energy(E=217.56 kJ·mol^(-1)) and high utilization rate of 50 wt% MSWI fly ash,the optimal glass-ceramics with spherical diopside,cuspidine and glass phase,excellent hardness of 7.97 GPa and bending resistance of 114.86 MPa are *** is worth mentioning that most of the high content of chlorine in MSWI fly ash will evaporate during vitrification process;the residual chlorine as well as heavy metals can be present steadily in crystalline ***,this study not only increases the attachment value of MSWI fly ash,but also eliminates the problems caused by high chlorine and heavy metals in MSWI fly ash.

关键词： Municipal solid waste incinerated(MSWI)fly ash Glass–ceramics Crystallization behavior Microstructure Properties Chlorine

Association of glutathione peroxidase-1 （GPx-1） rs1050450 Pro198Leu and Pro197Leu polymorphisms with cardiovascular risk：a meta-analysis of ob-servational studies

在线全文

学校读者我要写书评

暂无评论

Journal of Geriatric Cardiology 2014年第2期11卷 141-150页

作者： jun-Xia zhang Zhi-Mei WANG jun-jie zhang Lin-Lin ZHU Xiao-Fei GAO Shao-Liang CHEN Department of Cardiology Nanjing First Hospital Affiliated to Nanjing Medical University Nanjing Jiangsu Province 210006 China

Objective To clarify the association between rs1050450 polymorphism in Glutathione peroxidase-1 （GPx-1） and the risk of cardi-ovascular diseases （CVD） by performing a meta-analysis of published studies. There is growing evidence from different study types for an association of the GPx-1 polymorphism and cardiovascular outcomes, but observational studies have so far shown inconsistent results. Me-thods Relevant publications were searched through PubMed, Embase database databases and the Cochrane Library. We used odds ratios （ORs） with 95%confidence intervals （CIs） to assess the strength of association under the best genetic model. Both Q statistic and the I2 were used to check heterogeneity. Meta-regression analysis was performed to explore heterogeneity source. Sensitivity analysis, cumulative me-ta-analysis analysis and publication bias were used to test the reliability of the results. Results Data were available from two cohort studies and 8 case-control studies involving 1,430 cases and 3,767 controls. The pooled ORs for overall CVD risk was 1.36 with 95%CI：1.08-1.70 under a co-dominant model, and that for East Asian subgroup was 1.84 （95%CI：1.39-2.43）. Substantial heterogeneity for ORs were de-tected among all the included studies, mainly caused by ethnic differences between East Asian and non-East Asian populations. Although Egger＇s regression test suggested no statistical significant publication bias, Begg＇s funnel plot exhibited obvious asymmetry. The statistical significance disappeared after adjusting for potential publication bias in the overall studies. However, no substantial publication bias was found in the East Asian subgroup. Conclusions GPx-1 gene Pro198Leu and Pro197Leu polymorphisms considerably increased the risk of CVD in the East Asian population. Large-scale investigations are needed to confirm the results in different ethnicities.

关键词： Glutathione peroxidase-1 Cardiovascular diseases Polymorphism Meta-analysis

Effect of chip rate on the ranging accuracy in a regenerative pseudo-noise ranging system

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 Zhejiang University-Science C(Computers and Electronics) 2011年第2期12卷 132-139页

作者： Jian-wen JIANG Wei-jun YANG Chao-jie zhang Xiao-jun JIN Zhong-he JIN Department of Information Science and Electronic Engineering Zhejiang University Hangzhou 310027 China

The ranging accuracy of a pseudo-noise ranging system is mainly decided by range jitter and time delay discrimination. Many factors can affect the ranging accuracy, one of which is the chip rate. In digital signal processing, the time delay discrimination and autocorrelation function of sampled ranging sequences of different chip rates are very different. An approximation simulation model is established according to an in-phase quadrature (I/Q) correlator which is used to evaluate the time delay. Simulation results of the range jitter and time delay discrimination show that the chip rate which provides a non-integer sample-to-chip rate ratio can achieve a higher ranging accuracy, and some test results validate the simulation model. In some design missions, the simulation results may help to select an optimum sample-to-chip rate ratio to satisfy the design requirement on the ranging accuracy.

关键词： Ranging accuracy Range jitter Time delay discrimination Sample-to-chip rate ratio Integration time Autocorrelation function Fractional chip period delay

A new method for direct synthesis of Li2CO3 powders by membrane electrolysis

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2018年第8期37卷 716-722页

作者： Xi-Juan Pan Ting-An zhang Zhi-He Dou Guo-Zhi Lyu Xiu-Xiu Han jun-jie zhang School of Metallurgy Northeastern University Shenyang 110819 China Key Laboratory of Ecological Metallurgy of Multi-metal Intergrown Ores of Education Ministry Shenyang 110819China

A new method for the direct synthesis of Li2CO3 powders by membrane electrolysis from LiC1 solution is demonstrated in this paper, where a novel electrolysis system combining ventilation, agitation and loop filtration functions was reported. The aim of this work is to explore the effect of the starting concentration of LiC1 on the phase and micromorphology of Li2CO3 crystals and thereafter to explore the mechanism of crystallization and grain growth law. Scanning electron microscopy （SEM） images indicate that the particles become irregular polycrystalline from well-defined flower-like and the micro-crystals change from lamellar to needle-like and subsequently to smaller globular granules, and the surface of the crystals becomes smooth with LiC1 concentration increasing from 50 to 400 g.L^-3. The crystalline phases of the different samples were characterized using powder X-ray diffraction （XRD） and the results prove that pure LiaCO3 crystals can be obtained in a single step by the electrolysis method. The particle size distributions show that both volume mean crystal sizes and the full width at half maximum （FWHM） decrease when the starting LiC1 concentration increases from 50 to 300 g.L 3 and also decreases from 400 to 300 g-L^-3.

关键词： Lithium carbonate Lithium chloride Membrane electrolysis Carbon dioxide

Design study of charge-stripping scheme of heavy ion beams for HIAF-BRing

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2024年第5期35卷 30-41页

作者： jun-jie zhang Zhi-You Xu Jin-Quan zhang Wen-Wen Ge Liang-Ting Sun Huan-Yu Zhao Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China

Charge strippers play an essential role in heavy-ion accelerators by stripping the projectile ions to higher charge states to enhance the acceleration efficiency downstream of the *** the high-energy mode of the booster ring(BRing)of the high-intensity heavy-ion accelerator facility,the pre-accelerated ions from the iLinac will be stripped by a carbon foil to higher charge states and then injected into the *** key parameters of the stripper and stripped ions were calculated,and the influence of stripping on the beam quality was *** get high stripping efficiencies,the foil thicknesses and resultant charge state distributions for the typical ions were determined by the code *** equilibrium thickness was obtained for the U beam,while the stripper thicknesses for the Xe and Kr beams were determined based on a compromise between the stripped charge states and the stripping *** energy loss,energy straggling,and emittance growth due to stripping have a non-negligible impact on the transport of the stripped beams and the injection of the ***,these parameters were simulated by *** addition,the foil’s temperature evolution,which greatly affects the foil lifetime,was simulated by *** maximum temperature of the foil bombarded by the U and Xe beams with the nominal parameters will exceed the safe value in terms of the impact of evaporation on the foil’s *** the foil temperature constraint,the highest tolerable beam intensity and the injected ion number into the ring were derived for different beam *** results of this paper will present important reference data for the optimization design and commissioning of the beamline and injection to the BRing for the stripped ions.

关键词： High-intensity heavy-ion accelerator facility Charge stripper Energy spread Thermal analysis Emittance growth Injection turns

Effect of microscopic pore structures on ultrasonic velocity in tight sandstone with different fluid saturation

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2022年第6期19卷 2683-2694页

作者： Jian-Yong Xie jun-jie zhang Wei Xiang Yan-Ping Fang Ya-Juan Xue jun-Xing Cao Ren-Fei Tian State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Chengdu University of Technology(CDUT)Geophysical InstituteChengduSichuan610059China Oilfield Technology Division China National Offshore Oilfield Services Co.ZhanjiangGuangdong524000China School of Communication Engineering Chengdu University of Information TechnologyChengduSichuan610225China State Key Laboratory of Natural Gas Hydrate Beijing100028China

Microcosmic details of pore structure are the essential factors affecting the elastic properties of tight sandstone reservoirs,while the relationships in between are still incompletely clear due to the fact that quantitative or semi-quantitative experiments are hard to ***,three sets of tight sandstone samples from the junggar Basin are selected elaborately based on casting thin sections,XRD detection,and petro-physical measurement,and each set is characterized by a single varied microcosmic factor(pore connectedness,pore type,and grain size)of the pore *** ultrasonic pulse transmission technique is conducted to study the response of elastic properties to the varied microcosmic details of pore structure in the situation of different pore fluid(gas,brine,and oil)saturation and confining *** show samples with less connectedness,inter-granular dominant pores,and smaller grain size showed greater velocities in normal *** more sensitive to the variations of pore type,while Vsis more sensitive to the variations of grain *** with better connectedness at fluid saturation(oil or brine)show greater sensitivity to the confining pressure than those with gas saturation with a growth rate of 6.9%-11.9%,and the sensitivity is more likely controlled by *** pore types(inter-granular or intra-granular)can be distinguished by the sensitivity of velocities to the variation of pore fluid at high confining pressure(>60 MPa).The samples with small grain sizes tend to be more sensitive to the variations of confining *** this knowledge,we can semi-quantitatively distinguish the complex pore structures with different fluids by the variation of elastic properties,which can help improve the precision of seismic reservoir prediction for tight sandstone reservoirs.

关键词： Tight sandstone Pore structure Casting thin section Ultrasonic measurement

Ideal Spin Hydrodynamics from the Wigner Function Approach

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2021年第11期38卷 37-43页

作者： Hao-Hao Peng jun-jie zhang Xin-Li Sheng Qun Wang Interdisciplinary Center for Theoretical Study and Department of Modern Physics University of Science and Technology of ChinaHefei 230026China Peng Huanwu Center for Fundamental Theory Hefei 230026China Northwest Institute of Nuclear Technology Xi’an 710024China Key Laboratory of Quark and Lepton Physics(MOE) and Institute of Particle Physics Central China Normal UniversityWuhan 430079China

Based on the Wigner function in local equilibrium, we derive hydrodynamical quantities for a system of polarized spin-1/2 particles: the particle number current density, the energy-momentum tensor, the spin tensor, and the dipole moment tensor. Compared with ideal hydrodynamics without spin, additional terms at the first and second orders in the Knudsen number Κ_(n) and the average spin polarization Χ_(s) have been derived. The Wigner function can be expressed in terms of matrix-valued distributions, whose equilibrium forms are characterized by thermodynamical parameters in quantum statistics. The equations of motion for these parameters are derived by conservation laws at the leading and next-to-leading order Κ_(n) and Χ_(s).

关键词： frame Ideal Spin Hydrodynamics from the Wigner Function Approach

Latamoxef-induced severe thrombocytopenia during the treatment of pulmonary infection:A case report

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2022年第22期10卷 7906-7912页

作者： Ruo-Ying zhang jun-jie zhang Jin-Meng Li Ying-Ying Xu Yue-Huan Xu Xin-jun Cai Department of Pharmacy Affiliated Hangzhou Chest HospitalZhejiang University School of MedicineHangzhou 310000Zhejiang ProvinceChina Department of Out-patient Zhejiang Medical and Health Group Hangzhou HospitalHangzhou 310000Zhejiang ProvinceChina Tuberculosis Treatment Centre Affiliated Hangzhou Chest HospitalZhejiang University School of MedicineHangzhou 310000Zhejiang ProvinceChina

BACKGROUND Latamoxef shows excellent antibacterial activity against anaerobic bacteria such as Bacteroides *** of thrombocytopenic toxicity of latamoxef are *** report presents a case of severe thrombocytopenia possibly induced by latamoxef,an infrequent adverse drug reaction in a young patient with tuberculosis and Crohn's disease in *** SUMMARY We reported a case of severe thrombocytopenia induced by latamoxef in a 28-year-old man with tuberculosis and Crohn's *** admission,the patient presented with a cough productive of bloody sputum,a chest computed tomogram suggested scattered mottled,high-density shadows in both *** tests indicated a platelet count of 140000/μ*** a pulmonary bacterial infection,the patient received anti-infection therapy with latamoxef(dose:2.0 g)intravenously *** the 9th day of treatment,the platelet count decreased to 44000/μ*** the 12th day,scattered purpura and ecchymosis appeared on the patient’s limbs and trunk,and the platelet count decreased to 9000/μL after latamoxef treatment for 15 *** days after discontinuation of latamoxef,the platelet count recovered to 157000/μL,and the area of scattered purpura and ecchymosis on the limbs and trunk *** platelet counts remained in the normal range,and no thrombocytopenia was found at follow-up 15 mo after *** For patients treated with latamoxef,platelet counts should be carefully followed,and caregivers should be vigilant for the appearance of scattered ecchymosis.

关键词： Thrombocytopenia Latamoxef Adverse drug reactions Young onset Case report

One step sintering of homogenized bauxite raw material and kinetic study

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

International Journal of Minerals,Metallurgy and Materials 2016年第10期23卷 1231-1238页

作者： Chang-he Gao Peng Jiang Yong Li Jia-lin Sun jun-jie zhang Huan-ying Yang School of Material Science and Engineering University of Science and Technology Beijing Gongyi Tongda Zhongyuan Refractory Technology Co. Ltd.

A one-step sintering process of bauxite raw material from direct mining was completed, and the kinetics of this process was analyzed thoroughly. The results show that the sintering kinetics of bauxite raw material exhibits the liquid-phase sintering behavior. A small portion of impurities existed in the raw material act as a liquid phase. After X-ray diffraction analyses, scanning electron microscopy observations, and kinetics calculations, sintering temperature and heating duration were determined as the two major factors contributing to the sintering process and densification of bauxite ore. An elevated heating temperature and longer duration favor the densification process. The major obstacle for the densification of bauxite material is attributed to the formation of the enclosed blowhole during liquid-phase sintering.

关键词： bauxite refractory materials liquid phase sintering sintering kinetic studies