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Constructed wetlands for wastewater treatment in cold climate--A review

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Journal of Environmental Sciences 2017年第7期29卷 293-311页

作者： Mo Wang dong qing zhang Jian Wen dong Soon Keat Tan College of Landscape Architecture Fujian Agriculture and Forestry UniversityFuzhou 350002China Nanyang Environment&Water Research Institute 1 CleanTech Loop#06-10637141Singapore School of Civil and Environmental Engineering Nanyang Technological University639798Singapore

Constructed wetlands（CWs） have been successfully used for treating various wastewaters for decades and have been identified as a sustainable wastewater management option ***,the application of CW for wastewater treatment in frigid climate presents special *** treatment of wastewater relies largely on biological processes,and reliable treatment is often a function of climate *** date,the rate of adoption of wetland technology for wastewater treatment in cold regions has been slow and there are relatively few published reports on CW applications in cold *** paper therefore highlights the practice and applications of treatment wetlands in cold climate.A comprehensive review of the effectiveness of contaminant removal in different wetland systems including：（1） free water surface（FWS） CWs;（2） subsurface flow（SSF） CWs;and（3） hybrid wetland systems,is *** emphasis of this review is also placed on the influence of cold weather conditions on the removal efficacies of different *** strategies of wetland design and operation for performance intensification,such as the presence of plant,operational mode,effluent recirculation,artificial aeration and in-series design,which are crucial to achieve the sustainable treatment performance in cold climate,are also *** study is conducive to further research for the understanding of CW design and treatment performance in cold climate.

关键词： Constructed wetlands Wastewater treatment Nutrient Cold climate

Influence of friction-lubrication characteristics varying with rolling speed on instability of chatter and slip in cold tandem rolling process

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Journal of Iron and Steel Research International 2024年第4期31卷 894-908页

作者： Yan-li Xin Zhi-ying Gao Bo Tian qing-dong zhang School of Mechanical Engineering University of Science and Technology BeijingBeijing 100083China

In the high-speed cold tandem rolling process of thin plate,chatter or slip instability gives rise to the deterioration of equipment and product *** instability behavior is closely related to interfacial friction-lubrication con-dition which is generally characterized by the friction ***,with higher and higher speed requirements,the commonly used model of friction coefficient is no longer applicable and accurate.A novel approach is suggested to calculate the speed-dependent friction coefficient,in which the viscosity-pressure-temperature effects of the lubricant,surface roughness states of work rolls and rolled piece are comprehensively involved and the mixed flm lubrication theory is ***,the influences of friction coefficient on the instability of slip and chatter are investigated for a five-stand cold tandem rolling *** one side,the critical friction coefficient for each stand is determined by calculating the corresponding slip factor;on the other hand,the friction coefficient varying with rolling speed is combined with the model of theoretical critical rolling speed presented under constant friction coefficient,so that the speed threshold is ***,the stable and unstable regions corresponding to the rear three stands are individually discussed,and the technical strategies are proposed to suppress both slip and chatter frequently occurring in the actual rolling process.

关键词： Cold tandem rolling:Oil film thickness Speed-dependent friction coefficient-Slip:Chatter

Dynamic modeling and analysis on rigid-flexible coupling between vertical chatter and transverse bending vibration in process of cold rolling

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Journal of Iron and Steel Research International 2024年第11期31卷 2740-2754页

作者： Xiao-yong Wang Zhi-ying Gao Yan-li Xin qing-dong zhang School of Mechanical Engineering University of Science and Technology BeijingBeijing100083China

Considering the dynamic variation of roll gap and the transverse distribution of dynamic rolling force along the work roll width direction, the movement and deformation of rolls system, influenced by the coupling of vertical chatter and transverse bending vibration, may cause instability and also bring product defect of thickness difference. Therefore, a rigid-flexible coupling vibration model of the rolls system was presented. The influence of dynamic characteristics on the rolling process stability and strip thickness distribution was investigated. Firstly, assuming the symmetry of upper and lower structures of six-high rolling mill, a transverse bending vibration model of three-beam system under simply supported boundary conditions was established, and a semi-analytical solution method was proposed to deal with this model. Then, considering both variation and change rate of the roll gap, a roll vertical chatter model with structure and process coupled was constructed, and the critical rolling speed for self-excited instability was determined by Routh stability criterion. Furthermore, a rigid-flexible coupling vibration model of the rolls system was built by connecting the vertical chatter model and transverse bending vibration model through the distribution of dynamic rolling force, and the dynamic characteristics of rolls system were analyzed. Finally, the strip exit thickness distributions under the stable and unstable rolling process were compared, and the product shape and thickness distribution characteristics were quantitatively evaluated by the crown and maximum longitudinal thickness difference.

关键词： Transverse bending vibration Vertical chatter Rigid-flexible coupling vibration Strip thickness distribution Rolling process stability

Energy Management for a Residential Microgrid Using Wavelet Transform and Fuzzy Control Including a Vehicle-to-Grid System

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Journal of Electronic Science and Technology 2016年第4期14卷 291-297页

作者： dong-qing zhang Feng Yang Yang Luo Yu-Xiao Huang Cheng-Long Xia School of Energy Science and Engineering University of Electronic Science and TechnologyChengdu 611731China School of Automation Engineering University of Electronic Science and TechnologyChengdu 611731China

This paper presents the design and implementation of an energy management system （EMS） with wavelet transform and fuzzy control for a residential micro-grid. The hybrid system in this paper consists of a wind turbine generator, photovoltaic （PV） panels, an electric vehicle （EV）, and a super capacitor （SC）, which is able to connect or disconnect to the main grid. The control strategy is responsible for compensating the difference between the generated power by the wind and solar generators and the demanded power by the loads. Wavelet transform decomposes the power difference into a smoothed component and a fast fluctuated component. The command approach used for fuzzy logic rules considers the state of charging （SOC） of EV, renewable production, and the load demand as parameters. Furthermore, the command rules are developed in order to ensure a reliable grid when taking into account the EV battery protection to decide the output power of the EV. The model of the hybrid system is developed in detail under Matlab/Simulink software environment.

关键词： Energy management system (EMS),fuzzy control micro-grid renewable energies,vehicle-to-grid (V2G) wavelet.

PLASMA RESISTIN LEVELS AND SINGLE-NUCLEOTIDE POLYMORPHISMS IN RESISTIN GENE 5 FLANKING REGION IN PATIENTS WITH STROKE

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Chinese Medical Sciences Journal 2007年第1期22卷 27-32页

作者： Xing-jian Lin Ying-dong zhang qing-shan Guan qing Di Jing-ping Shi Wei-guo Liu Department of Neurology Nanjing Brain Hospital Nanjing Medical University Nanjing 210029

Objective To analyze the role of resistin in insulin resistance (IR) through investigating the variation of plasma resistin levels and single-nucleotide polymorphisms (SNPs) in resistin gene 5’ flanking region in stroke *** In 103 atherothrombotic cerebral infarction (ACI) patients, 85 lacunar infarction (LI) patients, 70 intracerebral hemorrhage (ICH) patients, and 86 healthy controls, plasma resistin and insulin levels were measured by ELISA , SNPs in resistin gene 5’ flanking region were detected by PCR and direct DNA sequencing. The subjects’ body height and weight, the body mass index, quantitative insulin sensitivity check index (QUICKI), blood pressure, and the concentration of fasting plasma glucose, triglyceride, total cholesterol, creatinine, low-density lipoprotein, and high-density lipoprotein were also determined. Results QUICKI was significantly lower in the ACI and ICH patients (0.316±0.037 and 0.309±0.032, respectively) than that in the controls (0.342±0.043, PG and -537A>C SNPs were not significantly different among the different groups, and those SNPs were not correlated with other clinical and biochemical *** Plasma resistin is associated with stroke by participating in the development of IR. The SNPs in resistin gene 5’ flanking region has no impact on the plasma resistin level.

关键词： resistin insulin resistance single-nucleotide polymorphisms stroke

Effect of interesting games on relief of preoperative anxiety in preschool children

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International Journal of Nursing Sciences 2014年第1期1卷 89-92页

作者： Xing-Lian Gao Ying Liu Shi Tian dong-qing zhang qing-Ping Wu Operation Room Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina Postgraduate Class Tongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina Anesthesiology Department Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina

Purpose:To evaluate the effect of interesting games on reducing preoperative anxiety and improving compliance with anaesthesia in ***:Ninety preschool-aged children undergoing elective surgery were randomly assigned to two *** children in the control group were admitted to a general preoperative room with one parent for 15e20 min,and were then taken into the anaesthesia *** anaesthetic induction,the nurse attracted the children’s attention using an interesting game with encouragement and attention *** children’s anxiety was assessed using the Modified Yale Preoperative Anxiety Scale(mYPAS)when they entered the operating room,while they were waiting to undergo s0urgery,and during anaesthetic ***,the children’s compliance with anaesthetic induction was assessed using the Induction Compliance Checklist(ICC).Results:No statistically significant differences in the mYPAS scores were observed between the two groups upon entering the operating room(p>0.05).The mYPAS scores were significantly lower in the experimental group than in the control group while waiting for surgery and during anaesthetic induction(p<0.05),while there were no significant differences in the mYPAS scores upon entering the operating *** children’s compliance with anaesthetic induction was significantly higher in the experimental group than in the control group(p<0.05).Conclusion:Engagement in an interesting game can reduce preschool-aged children’s preoperative anxiety and improve their compliance with anaesthetic induction.

关键词： Anxiety Child Game and playthings Preoperative care Preschool

Application of constructed wetlands for wastewater treatment in tropical and subtropical regions(2000–2013)

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Journal of Environmental Sciences 2015年第4期27卷 30-46页

作者： dong-qing zhang K.B.S.N.Jinadasa Richard M.Gersberg Yu Liu Soon Keat Tan Wun Jern Ng Advanced Environmental Biotechnology Centre Nanyang Environment & Water Research Institute Nanyang Technological University Department of Civil Engineering University of Peradeniya Graduate School of Public Health San Diego State University

Constructed wetlands（CWs） have been successfully used for treating various wastewaters for decades and have been identified as a sustainable wastewater management option for developing countries. With the goal of promoting sustainable engineered systems that support human well-being but are also compatible with sustaining natural（environmental）systems, the application of CWs has become more relevant. Such application is especially significant for developing countries with tropical climates, which are very conducive to higher biological activity and productivity, resulting in higher treatment efficiencies compared to those in temperate climates. This paper therefore highlights the practice,applications, and research of treatment wetlands under tropical and subtropical conditions since 2000. In the present review, removal of biochemical oxygen demand（BOD） and total suspended solid（TSS） was shown to be very efficient and consistent across all types of treatment wetlands. Hybrid systems appeared more efficient in the removal of total suspended solid（TSS）（91.3%）, chemical oxygen demand（COD）（84.3%）, and nitrogen（i.e.,80.7% for ammonium（NH）4-N, 80.8% for nitrate（NO）3-N, and 75.4% for total nitrogen（TN））as compared to other wetland systems. Vertical subsurface flow（VSSF） CWs removed TSS（84.9%）, BOD（87.6%）, and nitrogen（i.e., 66.2% for NH4-N, 73.3% for NO3-N, and 53.3% for TN）more efficiently than horizontal subsurface flow（HSSF） CWs, while HSSF CWs（69.8%）showed better total phosphorus（TP） removal compared to VSSF CWs（60.1%）. Floating treatment wetlands（FTWs） showed comparable removal efficiencies for BOD（70.7%）,NH4-N（63.6%）, and TP（44.8%） to free water surface（FWS） CW systems.

关键词： Constructed wetlands Treatment Nutrient Removal Tropical

Influence of core box vents distribution on flow dynamics of core shooting process based on experiment and numerical simulation

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China Foundry 2016年第1期13卷 22-29页

作者： Chang-jiang Ni Gao-chun Lu qing-dong zhang Tao Jing Jun-jiao Wu Lin-long Yang Qin-fang Wu School of Materials Science and Engineering Tsinghua University Suzhou Mingzhi Technology Co. Ltd.

Core shooting process plays a decisive role in the quality of sand cores, and core box vents distribution is one of the most important factor determining the effectiveness of core shooting process. In this paper, the influence of core box vents distribution on the flow dynamics of core shooting process was investigated based on in situ experimental observations with transparent core box, high-speed camera and pressure measuring system. Attention was focused on the variation of both the flow behavior of sand and pressure curves due to different vents distribution. Taking both kinetic and frictional stress into account, a kinetic-frictional constitutive model was established to describe the internal momentum transfer in the solid phase. Two-fluid model(TFM) simulation was then performed and good agreement was achieved between the experimental and simulated results on both the flow behavior of sand and the pressure curves. It was found that vents distribution has direct effect on the pressure difference of different locations in the core box, which determines the buoyancy force exerting on the sand particles and significantly influences the filling process of core sand.

关键词： vents distribution flow dynamics pressure variation core shooting process kinetic-frictional model two-fluid model

Isolation and characteristics of autoreactive T cells specific to aggrecan G1 domain from rheumatoid arthritis patients

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Cell Research 2000年第1期10卷 39-49页

作者： LI NING LI dong qing zhang KUANG YAN ZHOU ANNIE CARTMAN JEAN YVES LEROUX A ROBIN POOLE YI PING zhang ( Shanghai Institute of Immunology, Shanghai Second Medical University, Shanghai 200025, China)(Joint Diseases Laboratory, Shriners Hospital, Dep harmacy.ankara.edu.tr

Our previous work showed that the cartilage proteoglycan aggrecan could induce an erosive polyarthritis and spondylitis in BALB/c mice and the GI globular domain of the aggrecan (GI) contained the arthritogenic region. To elucidate whether autoreactive T cells to G1 are expressed in rheumatoid arthritis patients, we analyzed the frequency of human G1-specific T cells in the peripheral blood of five rheumatoid arthritis patients and tried to establish G1-reactive T cell lines from these rheumatoid arthritis patients. The results showed that the G1-specific T cells in PBL were detectable at the range of 4.97 ±0.5 ×10-6 in peripheral blood lymphocytes. We have also generated 15 G1-specific T lymphocyte lines from these pateints with a standard split-well method. All these cells expressed fine specificity to human recombinant G1, but not to unrelated antigen. All the 15 lines expressed a panT cell marker and 13 of them selectively used the αβ T cell receptor. Two of them used rye T cell receptor. The 13 of these T cell lines was CD4 positive. One line expressed CD8. One line expressed both CD4 and CD8. Moreover, 14 out of 15 lines expressed the Th-1 cytokine profile, characterized by interferon-γpositivity and IL-4 negativity. No Th-2 type cell line was generated. These data provide strong evidence in favor of the presence of autoreactive T cells in the rheumatoid arthritis pateints. What is the mechanism(s) that these autoreactive T cells attack self-target and whether these G1-specific, Th-1 type T cell lines can induce arthritis in immune deficiency mice are currently under investigation.

关键词： rG1-specific T cell lines T cell receptor cytokine profile rheumatoid arthritis.