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Chinese Journal of Chemical Engineering 2018年第11期26卷 2368-2376页

作者： zhe shen Zhiyu Huang State Key Laboratory of Oil and Gas Reservoir Geology and Exploration Southwest Petroleum University School of Energy and Architecture Xi'an Aeronautical University

Using CO_2 as gasification agent instead of steam in in-situ coal gasification chemical looping combustion(i G-CLC)power plant can eliminate energy consumption for steam generation, thus obtaining higher system efficiency. In this work, a comparative study of iG-CLC power plant using steam and CO_2 as gasification agent is concentrated on. The effects of steam to carbon ratio(S/C) and CO_2 to carbon ratio(CO_2/C) on the fuel reactor temperature,char conversion, syngas composition and CO_2 capture efficiency are separately investigated. An equilibrium carbon conversion of 88.9% is achieved in steam-based case as S/C ratio increases from 0.7 to 1.1, whereas a maximum conversion of 84.2% is obtained in CO_2-based case with CO_2/C ranging from 0.7 to 1.1. Furthermore the effects of oxygen carrier to fuel ratio(φ) on system performances are investigated. Increasing φ from 1.0 to1.4 helps to achieve char conversion from 75.9% to 88.9% in steam-based case, by contrast the char conversion can achieve 66.3%–84.2% in CO_2-based case within the same φ range. In terms of iG-CLC power plant, recycling partial CO_2 to the fuel reactor improves the overall performance. Approximately 3.9% of net power efficiency are increased in CO_2-based plant, from steam-based plant. Higher CO_2 capture efficiency and lower CO_2 emission rate are observed in CO_2-gasified iG-CLC power plant, expecting to be 90.63% and 85.18 kg·MW-1·h-1,respectively.

关键词： CO2 Steam iG-CLC Comparative study

Flexural-torsional buckling behavior of aluminum alloy beams

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Frontiers of Structural and Civil Engineering 2015年第2期9卷 163-175页

作者： Xiaonong GUO zhe XIONG Zuyan shen Department of Civil Engineering Tongji University Shanghai 200092 China

This paper presents an investigation on the flexural-torsional buckling behavior of aluminum alloy beams (AAB). First, based on the tests of 14 aluminum alloy beams under concentrated loads, the failure pattern, load-deformation curves, bearing capacity and flexural-torsional buckling factor are studied. It is found that all the beam specimens collapsed in the flexural-torsional buckling with excessive deformation pattern. Moreover, the span, loading location and slenderness ratio influence the flexural-torsional buckling capacity of beams significantly. Secondly, besides the experiments, a finite element method (FEM) analysis on the flexural-torsional buckling behavior of AAB is also conducted. The main parameters in the FEM analysis are initial imperfection, material property, cross-section and loading scheme. According to the analytical results, it is indicated that the FEM is reasonable to capture mechanical behavior of AAB. Finally, on the basis of the experimental and analytical results, theoretical formulae to estimate the flexural-torsional buckling capacity of AAB are proposed, which could improve the application of present codes for AAB.

关键词： flexural-torsional buckling aluminum alloy beams (AAB) finite element method (FEM) theoretical formula

Potential role of Helicobacter pylori infection in nonalcoholic fatty liver disease

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World Journal of Gastroenterology 2013年第41期19卷 7024-7031页

作者： Meng Li zhe shen You-Ming Li Department of Gastroenterology The First Affiliated HospitalZhejiang University School of Medicine

Accumulating evidence has implicated Helicobacter pylori(***)infection in extragastrointestinal diseases,including obesity,type 2 diabetes mellitus,cardiovascular disease,and liver ***,there has been a special focus on *** infection as a risk factor for the development of nonalcoholic fatty liver disease(NAFLD).NAFLD is currently considered to be the most common liver disorder in western countries,and is rapidly becoming a serious threat to public *** mechanisms of pathogenesis underlying NAFLD remain unclear at present and therapeutic options are *** growing awareness of the role of *** in NAFLD is thus important to aid the development of novel intervention and prevention strategies,because the eradication of *** is easy and much less expensive than long-term treatment of the other risk *** infection is involved in the pathogenesis of insulin resistance(IR),which is closely linked with *** provides a new insight into the pathogenesis of *** review probes the possible relationship between *** and NAFLD,from the perspective of the potential mechanism of how *** infection brings about IR and other aspects concerning this correlation.

关键词： Helicobacter pylori Nonalcoholic fatty liver disease Insulin resistance Inflammation Cytokines

Bending behavior of as-cast and annealed ZrCuNiAl bulk metallic glass

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Journal of Materials Science & Technology 2017年第10期33卷 1153-1158页

作者： Yongjiang Huang Zhiliang Ning zhe shen Weizhong Liang Haicao Sun Jianfei Sun School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China National Key Laboratory of Precision Hot Processing of Metals Harbin Institute of Technology Harbin 150001 China shenyang Engine Research Institute Aero Engine Corporation of China Shenyang 110000 China School of Materials Science and Engineering Heilongjiang University of Science and Technology Harbin 150027 China

Here ZrCuNiAl bulk metallic glass samples were annealed below its glass transition temperature. The bending behaviors and thermal properties of the as-cast and the annealed samples were studied. The increase of annealing time leads to the transition from ductile to more brittle behavior during bending tests. Meanwhile, prolonging the annealing causes a gradual decrease in the free volume content. Based on free volume theory, the change in the microstructure and mechanical properties induced by annealing treatment has been interpreted in detail.

关键词： Bulk metallic glasses Annealing Bending Fracture Free volume

Water quality characteristics along the course of the Huangpu River (China)

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Journal of Environmental Sciences 2007年第10期19卷 1193-1198页

作者： YANG Hong-jun shen zhe-min ZHANG Jin-ping WANG Wen-hua School of Environmental Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China Xuhui District Environmental Protection Bureau Shanghai 200030 China Shanghai Environmental Monitoring Center Shanghai 200030 China

Huangpu River is about 114.5 km from upriver Dianfeng to downriver Wusong, near the estuary of the Yangtze River. It plays a key role in supplying water for production, life, shipment and irrigation. With the industrial development, the pollution of the Huangpu River has become serious recently. The biological oxygen demand （BOD）, total nitrogen （TN）, total phosphorus （TP）, oil, phenol and suspended solids （SS） were lower in the upstream sites than in the downstream sites, indicating pollutants being input along its course. Water quality was the worst in the Yangpu site, near the center of Shanghai City. Dissolved oxygen （DO） content was less than 2 mg/L in the site of Yangpu in July. Among relations between thirteen characteristics, relations between BOD, DO, TN, TP, NH4^＋ -N, NO3^- -N and the count of total bacteria or Escherichia coli were significant and interdependent. Inner relationships between these main characteristics in the Huangpu River were studied. High nutrient concentration led to growth of microorganisms, including E. coli. Degradation of organic matters and respiration of bacteria made oxygen concentration decreased in the water body, and DO was a key factor for nitrification-denitrification process of nitrogen. In the Yangpu site, DO was decreased to less than 3.0 mg/L with BOD higher than 7.5 mg/L in May and July. Low DO concentration will decrease nitrification rate. Nitrification need at higher DO value than other organic substrate oxidation. Consequently, river water contains low NO3^- -N values with high amounts of TN and NH4^＋ -N there. This will block the self-purification of surface water, by decreasing the rate of nitrification-denitrification transformation process in the water body.

关键词： water quality ecological assessment Huangpu River nitrification

Vertical and temporal distribution of nitrogen and phosphorus and relationship with their influencing factors in aquatic-terrestrial ecotone:a case study in Taihu Lake,China

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Journal of Environmental Sciences 2007年第6期19卷 689-695页

作者： YANG Hong-jun shen zhe-min ZHU Song-he WANG Wen-hua School of Environmental Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China

Vertical and temporal distributions of N and P in soil solution in aquatic-terrestrial ecotone （ATE） of Taihu Lake were investigated, and the relations among N, P, ORP （oxidation reduction potential）, TOC, root system biomass and microorganism were studied. As a whole, significant declines in TN, NO3^--N, DON （dissolved organic nitrogen） and TP concentration in soil solution have occurred with increase of the depth, and reached their minima at 60 cm depth, except for NH4^＋-N, which increased with depth. The concentration of TP increased gradually from spring to winter in the topsoil, the maximum 0.08 mg/L presented in the winter while the minimum 0.03 mg/L in spring. In the deeper layer, the concentration value of TP fluctuated little. As for the NO3^--N, its seasonal variation was significant at 20 cm depth, its concentration increased gradually from spring to autumn, and decreased markedly in winter. Vertical and temporal distribution of DON is contrary to that of NO3^--N. The results also show that the variation of N and P in the percolate between adjacent layers is obviously different. The vertical variation ofTN, TP, NO3^--N, NH4^＋-N and DON is significant, of which the variation coefficient of NO3^--N along the depth reaches 100.23%, the highest; while the variation coefficient of DON is 41.14%, the smallest. The results of correlation analysis show that the concentration of nitrogen and phosphorus correlate significantly with TOC, ORP, root biomass and counts of nitrifying bacteria. Most nutrients altered much from 20 to 40 cm along the depth. However, DON changed more between 60 and 80 cm. Results show that soil of 0-60 cm depth is active rhizoplane, with strong capability to remove the nitrogen and phosphorus in ATE. It may suggest that there exists the optimum ecological efficiency in the depth of above 60 cm in reed wetland. This will be very significant for ecological restoration and reestablishment.

关键词： aquatic-terrestrial ecotone (ATE) soil percolate vertical and temporal distribution coefficient of variation ecological efficiency

Optical Pulling Force in Non-Paraxial Bessel Tractor Beam Generated with Polarization-Insensitive Metasurface

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Chinese Physics Letters 2023年第5期40卷 25-32页

作者：沈哲黄昕宇 School of Electronic and Optical Engineering Nanjing University of Science and TechnologyNanjing 210094China

Tractor beams,able to produce optical pulling forces(OPFs)on particles,are attracting increasing ***,non-paraxial Bessel tractor beams are generated using polarization-insensitive *** are found to exert on dielectric particles with specific radii at the axes of the *** strengths of the OPFs depend on the radii of the particles,which provides the possibility of sorting particles with different *** the OPFs,the radius ranges of particles vary with the polarization states or topological charges of the incident *** change of polarizations can provide a switch between the pulling and pushing forces,which offers a new way to realize dynamic manipulation of *** change of topological charges leads to disjoint radii ranges for the OPFs exerting on particles,which provides the possibility of selective optical ***,we study the behaviors of particles in the tractor *** simulation results reveal that linearly or circularly polarized tractor beams can pull particles a sufficient distance towards the light source,which verifies the feasibility of separating particles.

关键词： attracting separating forces

Enhanced electrical,mechanical and tribological properties of Cu-Cr-Zr alloys by continuous extrusion forming and subsequent aging treatment

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Journal of Materials Science & Technology 2022年第15期110卷 187-197页

作者： zhe shen Zhongze Lin Peijian Shi Jiale Zhu Tianxiang zheng Biao Ding Yifeng Guo Yunbo Zhong State Key Laboratory of Advanced Special Steel Shanghai UniversityShanghai 200444China School of Materials Science and Engineering Shanghai UniversityShanghai 200444China Shanghai Key Laboratory of Advanced Ferrometallurgy Shanghai UniversityShanghai 200444China

As a promising material for the new generation of high-speed railway contact wires,the comprehensive optimization of the electrical conductivity,strength,hardness and wear resistance of the Cu-Cr-Zr alloy has received extensive *** this paper,a high-performance Cu-1Cr-0.1Zr alloy with an ultimate tensile strength of 599.1 MPa,a uniform elongation of 8.6%,a microhardness of 195.7 HV_(0.2) and an electrical conductivity of 80.07%IACS was achieved by the continuous extrusion forming(CEF)and subsequent peak-aging *** grain refinement strengthening,dislocation strengthening and precipitation strengthening are identified to be responsible for the excellent electrical and mechanical properties of Cu-Cr-Zr *** wear behavior of Cu-Cr-Zr alloy was investigated by examining the evolution of worn surface morphology and subsurface *** microhardness(H)and reduced elastic modulus(E_(r))of the subsurface below the worn surface measured by nanoindentation were calculated to gage the tribological performance of Cu-Cr-Zr *** show that the continuously extruded and subsequently peak-aged specimen has the best wear resistance,which indicates that the tribological properties of CuCr-Zr alloy strongly depend on its strength and *** can be concluded that the CEF and subsequent aging treatment process provides a new and high-efficiency procedure for the continuous preparation of Cu-Cr-Zr alloys.

关键词： Cu-Cr-Zr alloy Continuous extrusion Electrical conductivity Mechanical properties Tribological properties

Effects of appendectomy and oral tolerance on dextran sulfate sodium colitis

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World Journal of Gastroenterology 2011年第19期17卷 2437-2445页

作者： Min Yue zhe shen Chao-Hui Yu Hua Ye Yue-Fang Ye You-Ming Li Department of Gastroenterology The First Affili- ated Hospital Medical School Zhejiang University Hangzhou 310003 Zheiian~ Province China

AIM： To evaluate the concomitant effects of appendec- tomy and oral tolerance on ***： Delayed-type hypersensitivity （DTH） was investigated at a 7-d interval after ovalbumin （OVA） ad- ministration and immunization under normal and colitis conditions in appendectomized or sham-operated mice. Pathological scores for the colon were graded after in- gestion of colon-extracted protein （CEP） and induction of dextran sulfate sodium （DSS） colitis in appendecto- mized or sham-operated mice. Thereafter, Thl and Th2 in Peyer＇s patches and spleen lymphocytes were de- tected in CEP-treated and bovine serum albumin （BSA）-treated control ***： In appendectomized mice, DTH was not inhibited at day 7 after OVA administration and at the initial phase of DSS colitis, whereas it was inhibited at day 14 and day 21. However, in sham-operated mice, it was inhibited during the whole procedure and the onset of DSS colitis. The protective role of CEP against DSScolitis was present in sham-operated mice, with pre- dominant improvement of colonic pathological changes, while vanished in the appendectomized mice. A shift from Thl to Th2 in Peyer＇s patches resulted from a de- crease of Thl cells with the ingestion of CEP. Compared with BSA in the sham-operated group, no predominant changes were observed in the appendectomized ***： Appendectomy interferes with the pro- tective role of CEP in DSS colitis via a shift from Th2 to Thl during oral tolerance induction.

关键词： Appendicectomy Oral tolerance Dextrin sulfate sodium Murine colitis Th1-Th2 balance

Unsymmetrical Quantum Key Distribution Using Tripartite Entanglement

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Communications in Theoretical Physics 2007年第3期47卷 441-445页

作者： XIONG Jin ZHANG zhe-shen ZHOU Nan-Run PENG Jin-Ye ZENG Gui-Hua State Key Lab of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shargghai 200240 China School of Information Science and Technology Northwest University Xi＇an 710069 China

An unsymmetrical quantum key distribution protocol is proposed, in which Greenherger-Horne-Zeilinger （GHZ） triplet states are used to obtain the secret key. Except the lost qubits due to the unperfectness of the physical devices, the unsymmetrical characteristic makes all transmitted qubits useful. This leads to：an excellent efficiency, which reaches 100% in an ideal case. The ＇security is studied from the aspect of information theory. By using the correlation of the GHZ tripartite entanglement state, eavesdropping can be easily checked out, which indicates that the presented protocol is more secure.

关键词： unsymmetrical quantum key distribution GHZ triplet states