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Process optimization of reaction of acid leaching residue of asbestos tailing and sodium hydroxide aqueous solution

science china(Technological sciences) 2009年第1期52卷 204-209页

作者： du gaoxiang1,3. zheng shuilin2.& ding hao1 1 school of materials science and technology, {2. {3. of Geosciences (beijing), beijing, 100083. china 2.school of Chemical and Environment Engineering, {2. {3. of Mining and technology (beijing), beijing 100083. china 3.Hebei Qinghe Refractory Group Co. Ltd., Xingtai 054804, {2. 1. school of materials {2. and {3. China University of Geosciences (Beijing) Beijing 100083 China 3. Hebei Qinghe Refractory Group Co. Ltd. Xingtai 054804 China 2. school of Chemical and Environment Engineering China University of Mining and Technology (Beijing) Beijing 100083 China

Silica is the major component of the acid leaching residue of asbestos tailing. The waterglass solution can be prepared by the reaction of the residue with sodium hydroxide aqueous solution. Compared to the high temperature reaction method, this process is environmental friendly and low cost. In this paper, the reaction process of the residue and the sodium hydroxide aqueous solution is optimized. The optimum reaction process parameters are as follows: the usage of sodium hydroxide is 2..4 g/100 g acid leaching residue, the reaction temperature is 90℃, the reaction time is 1 h, and the ratio of the liquid/solid is 2.0. The significance sequence of the process parameters to the alkali leaching reaction effect is the usage of sodium hydroxide > the ratio of the liquid/solid > the reaction time > the reaction temperature. The significance sequence to the leaching ratio of SiO2.is the ratio of the liquid/solid > the usage of sodium hydroxide > the reaction time > the reaction temperature. The significance sequence to the modulus of the sodium silicate is the ratio of the liquid/solid > the usage of sodium hydroxide > the reaction time > the reaction temperature. Under the optimum conditions, the leaching ratio of the SiO2.is 77.5%, and the modulus of the sodium silicate is 3.15. The XRD analysis result indicates that the major components of the alkali leaching residue are serpentine, talc, quartz and some albite.

关键词： asbestos tailing acid leaching residue sodium hydroxide process optimization

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Force Parameter Model of 3.Roll Mills for Continuous Cold Rolling Wires

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International Journal of Minerals,Metallurgy and materials 1999年第4期13卷 292-295页

作者： Baolong zheng1 Li Sun2.Ruichen An2.Jin Wang1 Weichang Zhu1(l Material science and Engineering {2., {3. of science and technology beijing, beijing 100083. china2.Tangshan iron and Steel Co. Ltd., Tangshan 063.00, china) Material science and Engineering school University of Science and Technology Beijing Beijing 100083 China Tangshan Iron and Steel Co. Ltd. Tangshan 063000 China

Based on experimental data, the mathematical model of rolling force parameters of 3.roll mills was studied. The structure ofthe model was theoretically set up and the coefficients were determined by static analysis of the data. The torque in continuous rollingwas measured, and the characteristics and efficiency of 3.roll mills are investigated.

关键词： 3.roll mill force mathematical model cold rolling wire

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Synthesis of vertically aligned carbon nanotube arrays on silicon substrates

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science china(Technological sciences) 2004年第5期47卷 616-624页

作者： zheng Ruiting1, CHENG Guoan1, PENG Yibin1, 2. Zhao Yong1, {2. LIU Huaping1 & LIANG Changlin1 1. Key Laboratory of Radiation Beam technology and {{2. Modification of Ministry of Education, Department of {{2. science and Engineering, beijing Normal university, beijing 100875, china 2. {12. of science, Civil Aviation university of china, Tianjin {2.0{2.0, china {2. Department of Physics, Nanchang university, Nanchang {2.0047, china Correspondence should be addressed to zheng Ruiting 1. Key Laboratory of Radiation Beam technology and materials Modification of Ministry of E{2.cation Department of Materials Science and Engineering Beijing Normal University 100875 Beijing China 2. school of science Civil Aviation University of China 300300 Tianjin China 3. Department of Physics Nanchang University 330047 Nanchang China

The growth of well-aligned carbon nanotube (CNT) arrays using a heat chemical vapor deposition system on silicon substrates is reported. The growth properties of CNT arrays are studied as a function of synthesis conditions. It is found that 750°C and 10 nm Fe film are suitable conditions for the growth of well-aligned CNT arrays. CNT arrays with a uniform diameter, thick tube wall and firm cohesion to the Si substrate can be grown for C2.2.concentration of 2.%. Based on the experiment, the processes of improving the alignment of CNT arrays and cohesion between CNT arrays and Si substrates are discussed.

关键词： carbon nanotubes, vertically aligned, silicon substrate, chemical vapor deposition.

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The Self-assembling and Application of Inorganic Anti-bacterial Material Made of Natural Nanoporous Carrier

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Journal of Wuhan university of technology({2. {3.) 2008年第6期23卷 771-774页

作者：孙春宝 school of Civil and Environmental Engineering University of Science and Technology Beijing

The inorganic antimicrobial material was inhibited to the microbes with the added metal ion,*** primary wet product carrying 5%-10% zinc ion was generated under the following conditions：temperature was 95 ℃,solution zinc concentration was 1.2.2.0 mol/L,and the ratio of Zn solution to zeolite weight was 5：*** final stable product was manufactured after baking in an oven for 1-{2.h at the temperature of 500-900 ℃.The baked material was tested for its disinfection effectiveness and coloring effect when mixed with paint *** on the final batch of tests,the zinc content of this anti-microbial product was further optimized.

关键词： inorganic antimicrobial nanoporous material antibacterial coating zeolite self-assembling

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Theoretical studies on the possible conformers and properties of tetranitrodiazidoacetylhexaazaisowurtzitane (TNDAIW)

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science china Chemistry 2004年第5期47卷 414-419页

作者： WU Yukai1, OU Yuxiang1, LIU Zhiguo1,2., LIU Jinquan1, MENG zheng1 & CHEN Boren1 1. school of {2. {3. and Engineering, beijing Institute of technology, beijing 100081, china 2. school of Chemistry and Chemical Engineering, Henan university, Kaifeng 475001, china 1. school of materials {2. and Engineering Beijing Institute of Technology 100081 Beijing China 2. school of Chemistry and Chemical Engineering Henan University 475001 Kaifeng China

Tetranitrodiazidoacetylhexaazaisowurtzitane (TNDAIW) is a novel polyazapolycyclic caged polyazidonitramine explosive first synthesized in our laboratory. All of the possible con- formers of TNDAIW are optimized using both the AM1 and PM3.methods. TNDAIW is predicted to have more polymorphs than hexanitrohexaazoisowurtzitane (CL-2.). The HF/6-3.G(d) level of theory is used to investigate the lowest energy structures of D-TNDAIW for both AM1 and PM3. The possible conformers of TNDAIW are predicted to be more stable than epsilon-CL-2. based on the N-NO2.bond lengths. The impact and shock sensitivities of both the possible DA- and DP-TNDAIW are lower than the corresponding ones of epsilon-CL-2.. TNDAIW with the possible conformers is estimated to be a promising novel high energy density explosive.

关键词： tetranitrodiazidoacetylhexaazaisowurtzitane, molecular modeling, impact and shock sensitivities.

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Generation and controlling of the dispersive wave by femtosecond pulses propagating in the normal dispersion regimes of the birefringent photonic crystal fiber

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science china(Physics,Mechanics & Astronomy) 2010年第4期53卷 643-648页

作者： LI ShuGuang1,2. zheng Yi1, YIN GuoBing2. ZHANG Lei2. ZHOU GuiYao2.& HOU LanTian2.1 school of {2.,{3. Jiaotong university,{3. 100044, china 2.Key Laboratory of Metastable materials {2. and technology, College of {2., Yanshan university, Qinhuangdao 066004, china 1. school of science Beijing Jiaotong University Beijing 100044 China2. Key Laboratory of Metastable Materials Science and Technology College of Science Yanshan University Qinhuangdao 066004 China

This paper studies the generation of the dispersive wave (DW) in the normal dispersion regimes of the birefringent photonic crystal fiber (BPCF) fabricated in this work. The remarkable blue-shifted radiation is found to be generated when 3. fs pulses are input in the normal dispersion regime of the BPCF for the first time. The characteristics of the blue-shifted DW strongly depend on the polarization of the input pulse. As a result, two peaks appear in the blue-shifted region of the spectrum when the input pulses polarize along the slow axis of the BPCF. With the increase of the center wavelength of the initial input pulse, the difference between the wavelengths of the two peaks widens. The peak location in the spectrum can be explained by the phase matching condition between the DW and the input pulse. In addition, when the input polarization is set to an angle of 45° with respect to the principal axes of the BPCF, the cross-phase modulation and coherent coupling between two orthogonally polarized modes would result in pulse trapping in the BPCF. Accor{2.ly, the DW shift toward short wavelength is restrained. The DW generation in the normal-dispersion regimes of BPCF can be controlled by the phase matching condition and polarization of the input pulse.

关键词： birefringent photonic crystal fiber normal dispersion dispersive wave pulse trapping

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Superplasticity and Superplastic Bulging Behavior of ZrO_2.Ni Nanocomposite

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Journal of Wuhan university of technology({2. {3.) 2011年第1期26卷 56-60页

作者：丁水 Aerospace Research Institute of materials and Processing technology

ZrO2.Ni nanocomposite was produced by pulse electrodeposition and its superplastic properties were investigated by the tensile and bulging tests. The as-deposited nickel matrix has a narrow grain size distribution with a mean grain size of 45 nm. A maximum elongation of 605% was observed at 72.1}K and a strain rate of 1.67×10-3.-1 by tensile test. Superplastic bulging tests were subsequently performed using dies with diameters of 1 mm and 5 mm respectively based on the optimal superplastic forming temperature. The effects of forming temperature and gas pressure on bulging process were experimentally investigated. The results indicated that ZrO2.Ni nanocomposite samples can be readily bulged at 72.1}K with H/d value （defined as dome apex height over the die diameter） larger than 0.5, indicating that the nanocomposite has good bulging ability. SEM and TEM were used to examine the microstructure of the as-deposited and bulged samples. The observations showed that significant grain coarsening occurs during superplastic bulging, and the microstructure is found to depend on the forming temperature.

关键词： superplasticity bulging microstructure ZrO2.Ni nanocomposite

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CXCL13.shapes tumor immune microenvironment in ovarian cancer with homologous recombination deficiency

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Genes & Diseases 2024年第5期11卷 48-50页

作者： Yue ding zheng Ye Bo ding Songwei Feng Furong {3. Xuejiao Ma Xiaoxuan Wang Yang Shen Department of Obstetrics and Gynaecology Zhongda HospitalSchool of MedicineSoutheast UniversityNanjingJiangsu 210008China State Key Laboratory of Bioelectronics School of Biological Science and Medical EngineeringSoutheast UniversityNanjingJiangsu 210096China State Key Laboratory of Translational Medicine and Innovative Drug Development Jiangsu Simcere Diagnostics Co.Ltd.NanjingJiangsu 210042China

Recently,immune checkpoint inhibitors(ICIs)and poly(ADP-ribose)polymerase inhibitors(PARPi)have played a pivotal role in prolonging the recurrence-free survival of patients with ovarian cancer(OC).1,2.Although PARPi have revolutionized the treatment of OC,the absence of reliable predictive biomarkers limits the broad application of ICIs for patients with homologous recombination(HR)deficiency(HRD).3.CXC-chemokine ligand 13.CXCL13.is a cytokine constitutively secreted in the stromal cells of the B-cell region of secondary lymphoid tissue.4 It exclusively binds to the chemokine receptor CXCR5,which is abundantly expressed in subsets of mature circulating B lymphocytes,follicular helper T cells,and skin-derived dendritic cells,and governs the migration of these cells into secondary lymphoid organs in response to the CXCL13.gradient.5 In this study,we aimed to elucidate the role of CXCL13.in shaping the tumor immune microenvironment(TIME)in HR-deficient OC and to explore its relationship with the cGAS-STING signaling pathway.

关键词： CXCL13 cancer organs

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Parentage determination of an isolated Yangtze finless porpoise population Neophocaena phocaenoides asiaeorientalis in the Yangtze Tian-e-Zhou Baiji National Natural Reserve based on molecular data

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Progress in Natural science:materials International 2005年第2期15卷 54-61页

作者： XIA Junhong 1,2. zheng Jinsong 1,2. XU Limei 1,2.and WANG ding1*(1. Institute of Hydrobiology, Chinese Academy of {2.s, Wuhan 43.072. {3. 2. Graduate school of the Chinese Academy of {2.s, beijing 10003., {3.) Institute of Hydrobiology Chinese Academy of Sciences Wuhan 430072 China. Graduate school of the Chinese Academy of {2.s Beijing 100039 China

Reproductive behaviors are poorly known for the Yangtze finless porpoise Neophocaena phocaenoides asiaeorientalis. In this study, the parentage of an isolated Yangtze finless porpoise population inhabiting the Yangtze Tian-e-Zhou Baiji National Natural Reserve is determined by analysis of microsatellite loci and mitochondrial DNA (mtDNA) control region sequences, and the porpoise's reproductive behaviors are studied. Overall 4 full parentage assignments and additional {2.single parentage assignments were determined for the population of 2.2.individuals. The analysis shows that their estimated reproductive cycle is shorter than that reported previously and there probably exists an overlapping between gestation and lactation period. The study also shows that the female does not show fidelity to a particular male for breeding and vice versa, the oldest males did not monopolize mating and the dominance rank could not be so strict for the porpoise society. Moreover, the porpoise's mating pattern and relatedness among candidate parents are discussed here. These results provide important information for making guidelines of management and conservation for this protected population.

关键词： Yangtze finless porpoise isolated population reproductive behavior parentage

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Electrical Breakdown Characteristic of Nanostructured W-Cu Contacts materials

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Journal of Wuhan university of technology({2. {3.) 2006年第4期21卷 32-35页

作者：王俊勃 school of Mechanical and Electrical Engineering Xi'an Polytechnic UniversityXi'an 710048 ChinaSchool of Science Xi'an Jiaotong University Xi'an 710049China

Nanostructured （ NS ）W-Cu composite powder was prepared by mechanical alloying （ MA ）, and nanostructared bulk of W-Cu contact material was fabricated by hot press sintering in an electrical vacuum furnace. The rnicrostructure, electric conductivity, hardness and break down voltage of NS W- Cu alloys were measured and compared to those of conventional W-Cu alloys prepared by powder metallurg＇y. The experimental results show that microstructural refinement and uniformity can improve the breakdown behavior and the electric arc stability of nanostructared W- Cu contacts materials. Also, the wanostructured W- Cu contact material shows the characteristic of sprea{2. electric arcs, which is of benefit to electric arc erosion.

关键词： nanostructured materials W-Cu alloy electrical breakdown

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