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Influence of microwave treatment on grinding and dissociation characteristics of vanadium titano-magnetite

International Journal of Minerals,Metallurgy and Materials 2019年第2期26卷 160-167页

作者： jun-peng Wang tao Jiang Ya-jing liu Xiang-xin Xue School of Metallurgy Northeastern University Key Laboratory of Liaoning Province for Recycling Science of Metallurgical Resources

The effect of microwave treatment on the grinding and dissociation characteristics of vanadium titano-magnetite(VTM) ore were investigated using scanning electron microscopy(SEM), nitrogen absorption measurements, particle size distribution measurements, X-ray diffraction(XRD) analysis, Fourier transform infrared(FT-IR) spectroscopic analysis, and magnetic separation. SEM analysis showed that microfractures appeared in the microwave-treated VTM, which is attributed to the microwaves' selective heating characteristic and the differential expansion between minerals and gangues. Nitrogen absorption showed that the microfractures were more pronounced when the microwave heating time was increased. Particle size distribution analysis showed that microwave treatment could improve the grindability of the VTM, thus increasing the weight percent of the fine-ground product. The increase in grindability was more significant with prolonged heating time. Moreover, the particle size distribution of the fine-ground product changed only slightly after the microwave treatment. XRD analysis showed that the crystallinity of the microwave-treated VTM increased with increasing microwave heating time. The magnetic separation tests revealed that the separation efficiency increased as a result of the intergranular fractures generated by microwave treatment. The Fe grade of the magnetic fraction of microwave-treated VTM was 1.72% higher than that of the raw ore. We concluded that the microwave treatment was beneficial, especially for the mineral processing characteristics.

关键词： microwave treatment vanadium titano-magnetite grinding microstructure magnetic separation

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Development of an ε-type actuator for enhancing high-speed electro-pneumatic ejector valve performance

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第11期9卷 1552-1559页

作者： Zhong XIANG Hao liu Guo-Liang tao jun MAN Wei ZHONG State Key Laboratory of Fluid Power Transmission and Control Zhejiang University Hangzhou 310027 China

A novel ε-type solenoid actuator is proposed to improve the dynamic response of electro-pneumatic ejector valves by reducing moving mass weight. A finite element analysis (FEA) model has been developed to describe the static and dynamic operations of the valves. Compared with a conventional E-type actuator, the proposed ε-type actuator reduced the moving mass weight by almost 65% without significant loss of solenoid force, and reduced the response time (RT) typically by 20%. Prototype valves were designed and fabricated based on the proposed ε-type actuator model. An experimental setup was also established to investigate the dynamic characteristics of valves. The experimental results of the dynamics of valves agreed well with simulations, indicating the validity of the FEA model.

关键词： ε-type actuator High-speed electro-pneumatic ejector valve Finite element method Dynamic simulation and experiment

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Comparison of the mechanisms of microwave roasting and conventional roasting and of their effects on vanadium extraction from stone coal

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International Journal of Minerals,Metallurgy and Materials 2015年第5期22卷 476-482页

作者： Yi-zhong Yuan Yi-min Zhang tao liu Tie-jun Chen College of Resources and Environmental Engineering Wuhan University of Science and Technology Hubei Provincial Engineering Technology Research Center of High efficient Cleaning Utilization for Shale Vanadium Resource

Experiments comparing microwave blank roasting and conventional blank roasting for typical vanadium-bearing stone coal from Hubei Province in central China, in which vanadium is present in muscovite, were conducted to investigate the effects of roasting tempera- ture, roasting time, H2SO4 concentration, and leaching time on vanadium extraction. The results show that the vanadium leaching efficiency is 84% when the sample is roasted at 800℃ for 30 min by microwave irradiation and the H2SO4 concentration, liquid/solid ratio, leaching temperature, and leaching time are set as 20vo1%, 1.5：1 mL.g-1, 95℃, and 8 h, respectively. However, the vanadium leaching efficiency achieved for the sample subjected to conventional roasting at 900℃ for 60 min is just 71% under the same leaching conditions. Scanning electron microscopy （SEM） analysis shows that the microwave roasted samples contain more cracks and that the particles are more porous compared to the conventionally roasted samples. According to the results of X-ray diffraction （XRD） and Fourier-transform infrared （FTIR） analyses, neither of these roasting methods could completely destroy the mica lattice structure under the experimental conditions; however, both methods deformed the muscovite structure and facilitated the leaching process. Comparing with conventional roasting, microwave roasting causes a greater deformation of the mineral structure at a lower temperature for a shorter roasting time.

关键词： vanadium metallurgy extraction stone coal microwave roasting leaching vanadium oxides

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新生儿坏死性小肠结肠炎病情进展的影响因素分析

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临床医学研究与实践 2018年第28期3卷 112-114页

作者：和灿琳胡浩戍俊陶刘玲奚敏云南省昆明市儿童医院云南昆明650000

目的探讨影响新生儿坏死性小肠结肠炎(NEC)病情进展的相关因素。方法选择2015年10月至2017年10月在我院确诊的102例坏死性小肠结肠炎患儿的临床资料,按照Bell分期将其分为Ⅰ期组(62例)、Ⅱ期/Ⅲ期组(40例)。对各项可能引起NEC病情进展... 详细信息

目的探讨影响新生儿坏死性小肠结肠炎(NEC)病情进展的相关因素。方法选择2015年10月至2017年10月在我院确诊的102例坏死性小肠结肠炎患儿的临床资料,按照Bell分期将其分为Ⅰ期组(62例)、Ⅱ期/Ⅲ期组(40例)。对各项可能引起NEC病情进展的相关因素进行单因素和多因素Logistic回归分析。结果单因素分析结果显示,贫血、胎龄小于37周、出生体重小于2.5 kg、合并呼吸衰竭、合并心力衰竭、母乳喂养、发病前使用益生菌及合并消化道畸形是影响NEC病情进展的相关因素(P<0.05)。多因素分析显示,贫血、胎龄、出生体重、合并呼吸衰竭、合并心力衰竭、母乳喂养、发病前口服益生菌、合并消化道畸形均与NEC的疾病进展存在相关性(P<0.05),其中贫血、胎龄、出生体重、合并呼吸衰竭、合并心力衰竭及合并消化道畸形为影响NEC进展的独立危险因素,而母乳喂养、发病前口服益生菌则为NEC进展的保护因素(P<0.05)。结论 NEC的恶化与早产、体重、合并呼吸衰竭、合并心力衰竭、母乳喂养等因素有关,采取母乳喂养并口服益生菌能够减轻NEC的严重程度。

关键词：新生儿坏死性小肠结肠炎(NFC) 影响因素

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Phase Equilibria of Hydrogen Bonding Fluid in a Slit Pore with Broken Symmetry

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Chinese Journal of Chemical Physics 2015年第3期28卷 288-294,I0001页

作者： Xiao-yu liu Jiang-tao Li Fang Gu Hai-jun Wang College of Chemistry and Environmental Science Hebei University Baoding 071002 China Chemical Biology Key Laboratory of Hebei Province Hebei University Baoding 071002 China Key Laboratory of Medical Chemistry and Molecular Diagnosis Ministry of Education BaodinE 071002 China

Phase equilibria of hydrogen bonding （HB） fluid confined in a slit pore with broken symmetry were investigated by the density functional theory incorporated with modified fundamental measure theory, where the symmetry breaking originated from the distinct interactions between fluid molecules and two walls of the slit pore. In terms of adsorption-desorption isotherms and the corresponding grand potentials, phase diagrams of HB fluid under various conditions are presented. Furthermore, through phase coexistences of laying transition and capillary condensation, the effects of HB interaction, pore width, fluid-pore interaction and the broken symmetry on the phase equilibrium properties are addressed. It is shown that these factors can give rise to apparent influences on the phase equilibria of confined HB fluid because of the competition between intermolecular interaction and fluid-pore interaction. Interestingly, a significant influence of broken symmetry of the slit pore is found, and thus the symmetry breaking can provide a new way to regulate the phase behavior of various confined fluids.

关键词： Hydrogen bonding fluid Broken symmetry Phase equilibria Density functional theory

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S-scheme regulated Ni_(2)P-NiS/twinned Mn_(0.5)Cd_(0.5)S hetero-homojunctions for efficient photocatalytic H_(2)evolution

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Journal of Materials Science & Technology 2024年第2期169卷 148-157页

作者： Qiqi Zhang Zhen Wang Yuhang Song jun Fan tao Sun Enzhou liu School of Chemical Engineering/Xi’an Key Laboratory of Special Energy Materials Northwest UniversityXi’an 710069China

Effective bulk phase and surface charge separation is critical for charge utilization during the photo-catalytic energy conversion *** this work,the ternary Ni_(2)P-NiS/twinned Mn_(0.5)Cd_(0.5)S(T-MCS)nanohybrids were successfully constructed via combining Ni_(2)P-NiS with T-MCS solid solution for visible light photocatalytic H_(2)evolution.T-MCS is composed of zinc blende Mn_(0.5)Cd_(0.5)S(ZB-MCS)and wurtzite Mn_(0.5)Cd_(0.5)S(WZ-MCS)and those two alternatively arranged crystal phases endow T-MCS with excellent bulk phase charge separation performance for the slight energy level difference between ZB-MCS and WZ-MCS.S-scheme carriers transfer route between NiS and T-MCS can accelerate the interfacial charge separation and retain the active electrons and holes,meanwhile,co-catalyst Ni_(2)P as electron receiver and proton reduction center can further optimize the H_(2)evolution reaction kinetics based on the surface Schottky barrier *** above-formed homo-heterojunctions can establish multiple charge transfer channels in the bulk phase of T-MCS and interface of T-MCS and Ni_(2)*** the synergistic effect of twinned homojunction,S-scheme heterojunction,and Schottky barrier,the ternary Ni_(2)P-NiS/T-MCS com-posite manifested an H_(2)production rate of 122.5 mmol h^(-1)g^(-1),which was 1.33,1.24,and 2.58 times higher than those of the NiS/T-MCS(92.4 mmol h^(-1)g^(-1)),Ni_(2)P/T-MCS(98.4 mmol h^(-1)g^(-1)),and T-MCS(47.5 mmol h^(-1)g^(-1)),*** work demonstrates a promising strategy to develop efficient sul-fides photocatalyst toward targeted solar-driven H_(2)evolution through homo-heterojunction engineering.

关键词： Photocatalytic H_(2)evolution Twinned Mn_(0.5)Cd_(0.5)S Homojunction S-scheme heterojunction Schottky barrier

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Modification of FCC slurry oil and deoiled asphalt for making high-grade paving asphalt

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Chinese Journal of Chemical Engineering 2022年第4期35卷 300-309页

作者： Lingrui Cui jun Xu Mannian Ren tao Li Dianhua liu Fahai Cao Large Industrial Reactor Engineering Research Center of Ministry of Education East China University of Science and TechnologyShanghai 200237China Sinopec Luoyang Company Luoyang 471003China

With the rapid development of modern industry,high-grade paving asphalt is massively required to meet the demands for modern *** one of additives,natural asphalt is indispensable since it can improve the performance of paving asphalt in all ***,the application of non-renewable natural asphalt is increasingly restricted by its limited *** is imperative to find alternative approaches to produce high-grade paving *** catalytic cracking(FCC)slurry oil is an ideal soft component for producing paving asphalt due to its high content of aromatics and ***,its bad ageing resistance limits its application to only low-grade paving *** the present work,a novel approach for producing high-grade paving asphalt was investigated using chemically modified FCC slurry oil and deoiled asphalt(DOA).The FT-IR and NMR results showed that dehydrogenation and condensation reaction occurred during the ageing *** a series of aliphatic alcohols and aldehydes,propanal was selected as a proper modifier to improve the ageing resistance of FCC slurry *** propanalmodified slurry oil possessed more substituted aromatic units and less aromatic hydrogen atoms than other modified slurry oils,thus showing better ageing *** the increase of length of aliphatic chains in modifier,the modified slurry oil contained more and longer alkyl substituent group on *** with the cross-linked oil(slurry oil modified by cross-linking agent),modified slurry oil possessed similar ageing resistance but higher flowing ***,the effect of operation conditions on the kinematic viscosity of modified slurry oil were *** with modified slurry oil,the penetration ratio of asphalt product increased from 53.7 to 66.2,which met the standard of 70#paving *** the microscopic observations and FT-IR results indicated that modification process effectively reduced the oxidation degree of asphalt product,thu

关键词： Paving asphalt FCC slurry oil Ageing resistance Fuel Petroleum Chemical reaction

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Effect of wetland plant fermentation broth on nitrogen removal and bioenergy generation in constructed wetland-microbial fuel cells

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Frontiers of Environmental Science & Engineering 2022年第12期16卷 89-100页

作者： Yiting Chen jun Yan Mengli Chen Fucheng Guo tao liu Yi Chen Key Laboratory of the Three Gorges Reservoir Region’s Eco-Environment(Ministry of Education) Chongqing UniversityChongqing400045China College of Environment and Ecology Chongqing UniversityChongqing400045China

Constructed wetlands(CWs)are widely used as a tertiary treatment technology,and the addition of carbon sources can significantly improve advanced nitrogen ***,excessive carbon sources would lead to an increase in the effluent chemical oxygen demand in CWs,and microbial fuel cells(MFCs)can convert these into *** this study,constructed wetland-microbial fuel cells(CW-MFCs)were built to achieve simultaneous nitrogen removal and electricity generation,using wetland plant litter fermentation broths as carbon *** total nitrogen removal in the groups with fermentation broth addition(FGs)reached 83.33%,which was 19.64%higher than that in the CG(group without fermentation broth),and the mean voltages in the FGs were at least 2.6 times higher than that of the ***,two main components of the fermentation broths,acetic acid(Ac)and humic acid(HA),were identified using a three-dimensional excitation emission matrix and gas chromatograph and added to CW-MFCs to explore the influence mechanism on the treatment *** and electrogenesis presented the same tendency:Ac&HA>Ac>CG’(groups without Ac and HA).These results indicate that Ac and HA increased the abundance of functional genes associated with nitrogen metabolism and electron *** study demonstrated that CW-MFC fermentation broth addition can be a potential strategy for the disposal of secondary effluent and bioelectricity generation.

关键词： Constructed wetland Microbial fuel cell Nitrogen removal Bioenergy generation Carbon source

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Study on Transient Gap Resonance with Consideration of the Motion of Floating Body

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China Ocean Engineering 2022年第6期36卷 994-1006页

作者： GAO jun-liang LYU Jing WANG Jing-hua ZHANG Jian liu Qian ZANG jun ZOU tao School of Naval Architecture and Ocean Engineering Jiangsu University of Science and TechnologyZhenjiang 212100China Key Laboratory of Port Waterway and Sedimentation Engineering of MOTNanjing Hydraulic Research InstituteNanjing 210029China Department of Civil and Environmental Engineering the Hong Kong Polytechnic UniversityHong KongChina Centre for Infrastructure Geotechnical and Water Engineering(IGWE)Department of Architecture and Civil EngineeringUniversity of BathBA27AYU.K Shandong Provincial Key Laboratory of Ocean Engineering Qingdao 266100China

In this paper, the transient fluid resonance phenomenon inside a narrow gap between two adjacent boxes excited by the incident focused waves with various spectral peak periods and focused wave amplitudes is simulated by utilizing the open-sourced computational fluid dynamics software, Open FOAM. The weather-side box is allowed to heave freely under the action of waves, and the lee-side box keeps fixed. This paper mainly focuses on how both the spectral peak period and the focused wave amplitude affect the free-surface amplification inside the gap, the motion of the weather-side box, and the wave loads(including the vertical and the horizontal wave forces) acting on both *** comparison, another two-box system with both boxes fixed is also considered as a control group. It is found that the motion of the weather-side box significantly changes the characteristics of the transient gap resonance, and it would cause that the fluid resonant period becomes 1.4-1.6 times that of the two-box system with both boxes *** the concerned physical quantities(i.e., the free-surface amplification in the gap, the motion of the weather-side box, the wave loads) are found to closely depend on both the spectral peak period and the focused wave amplitude.

关键词： transient gap resonance focused waves free-surface amplification wave loads heave motion OpenFOAM

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World Journal of Gastroenterology 2019年第23期25卷 2898-2910页

作者： Wei-Dong Fan tao Chen Peng-jun liu Department of Gastroenterology the Affiliated Zhangjiagang Hospital of Soochow UniversityZhangjiagang 215600Jiangsu ProvinceChina Department of Gastroenterology the Wujin Hospital Affiliated to Jiangsu UniversityChangzhou 213002Jiangsu ProvinceChina

BACKGROUND NIMA related kinase 2(NEK2) is closely related to mitosis, and it is currently considered to be over-expressed frequently in many poorly prognostic ***, the effect of the up-regulated NEK2 on cellular signaling in tumors,such as gastric cancer(GC), is *** To determine the role of the up-regulation of NEK2 in *** To investigate the pathological significance of NEK2 in GC, the expression pattern of NEK2 in GC was investigated based on the 'Oncomain' database and compared between 30 pairs of cancer samples and adjacent tissues. The coexpression of NEK2 and ERK in GC was analyzed using The Cancer Genome Atlas(TCGA) database and confirmed in clinical samples by quantitative realtime PCR(qRT-PCR), and the survival curve was also plotted. Western blot or qRT-PCR was used to analyze the effect of NEK2 on the phosphorylation levels of ERK and c-jun in two GC cell lines(BGC823 and SGC7901) with NEK2 overexpression, and the expression of the downstream effector cyclin ***, CCK8, EdU incorporation assay, and flow cytometry were used to detect the proliferative ability of BGC823 and SGC7901 cells with stably silenced *** NEK2 was significantly up-regulated in human GC tissues. ERK was significantly associated with NEK2 expression in human clinical specimens, and combined overexpression of NEK2 and ERK potentially forecasted a poor prognosis andsurvival in GC patients. NEK2 knockdown in GC cells inhibited ERK and c-jun phosphory-lation and reduced the transcription of cyclin D1. More interestingly,NEK2 can rescue the inhibition of cellular viability, proliferation, and cell cycle progression due to ERK *** Our results indicate that NEK2 plays a carcinogenic role in the malignant proliferation of GC cells via the ERK/MAPK signaling, which may be important for treatment and improving patient survival.

关键词： NIMA related kinase 2 ERK/MAPK signaling Cyclin D1 Cell proliferation Gastric cancer

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