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Impact of Electronic Wastes Recycling on Environmental Quality

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Biomedical and Environmental Sciences 2006年第2期19卷 137-142页

作者： JIAN-PING WANG xi-kun GUO College of Science Shantou University Shantou 515041 Guangdong China

Objective To evaluate the environmental quality of Guiyu, Guangdong impacted by the electronic waste recycling industry. Methods The surface water, ground water and sediment samples taken separately from two sites that recycle E-wastes and other rubbish relevant to the E-waste recycling, and an agricultural area, were analyzed, and the data were used to evaluate the impact of E-waste recycling on the environmental quality of Guiyu based on environmental quality standards in China. Results The concentrations of lead and iron in the surface water samples significantly different in the three locations. The maximum value of lead in the first site was 8 times higher than the threshold of environmental quality standards for surface water. The concentration of iron in polluted sample was 22 times that of the background sample. Manganese and iron also showed a significant difference in ground water samples between the three sites. The amount of iron was 22 times that of the threshold of the quality standard for ground water, and 120 times that of the background sample. Moreover, the results of all the eight heavy metals showed significant differences among the sediment samples. The concentrations of copper, cadmium, nickel, and lead in the polluted samples were above the median benchmarks of National Oceanic and Atmospheric Administration （NOAA）. The copper concentration of 2670 mg/kg was 10 times that of the median benchmark. Conclusion E-waste recycling has led to the severe pollution Guiyu.

关键词： Electronic waste recycling Environmental quality impact evaluation

Study on the Total Amount Control of Atmospheric Pollutant Based on GIS

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Biomedical and Environmental Sciences 2005年第4期18卷 233-237页

作者： JIAN-PING WANG xi-kun GUO College of Science Shantou University Shantou 51500 Guangdong China

To provide effective environmental management for total amount control of atmospheric pollutants. Methods An atmospheric diffusion model of sulfur dioxide on the surface of the earth was established and tested in Shantou of Guangdong Province on the basis of an overall assessment of regional natural environment, social economic state of development, pollution sources and atmospheric environmental quality. Compared with actual monitoring results in a studied region, simulation values fell within the range of two times of error and were evenly distributed in the two sides of the monitored values. Predicted with the largest emission model method, the largest emission of sulfur dioxide would be 54 279.792 tons per year in 2010. Conclusion The mathematical model established and revised on the basis of GIS is more rational and suitable for the regional characteristics of total amount control of air pollutants.

关键词： Total amount control of atmospheric pollutants Atmospheric diffusion model Pollution source GIS

Ablation characteristics of insulator under high-temperature gas dual-pulse erosion

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Defence Technology（防务技术） 2022年第10期18卷 1875-1885页

作者： Yang Liu xiao-cong Li Peng-fei Zhu kun xi Northwestern Polytechnical University 710072Xi'anPR China xi'an Modern Chemistry Research Institute 710065PR China Department of Aerospace Propulsion Technology Science and Technology on CombustionInternal Flow and Thermal-Structure LaboratoryShaanxiPR China

This study numerically simulated and investigated the flow field characteristics of a typical dual-pulse solid rocket motor with a soft pulse separation device through thermal insulation ablation under high-temperature dual-pulse *** ablation rate of ethylene-propylene-diene monomer(EPDM)insulator was measured after the *** results were analyzed through scanning electron microscopy and microcomputed *** ablation mechanism of the EPDM insulator under the operation conditions of a dual-pulse solid rocket motor was evaluated by analyzing the *** results reveal that the internal flow field of the motor with a soft pulse separation device is *** original charred layer existing on the EPDM insulator surface in the first pulse combustor is the decisive factor affecting the final ablation rate of the dual-pulse motor during the second pulse operation,and the ablation characteristic region is easily formed with the exfoliation of the charred *** ablation rate difference of the insulator increases with gas velocity.

关键词： Dual-pulse solid rocket motor High temperature gas Ablation PSD Charred layer

Pure phase MoN: preparation by chemical-diffused permeation and enhanced conductivity with rare earth Gd

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Rare Metals 2015年第2期34卷 137-142页

作者： xin Li Chao Gao Yu-Zhi Jiang xi-kun Li School of Materials Science and Engineering Shenyang Ligong University

MoN was prepared by rare earth Gd thermaldiffused permeation method via solid–gas interface reaction using（NH_4）_4[NiMo6O_24H_6]·7H_2O（abbreviated as NiMo6） as the precursor. Thermo-gravimetric differential thermal analysis（TG–DTA） was used to study the product＇s stability. The results of X-ray diffractometer（XRD）and X-ray photoelectron spectroscopy（XPS） indicate that a new hexagonal crystal MoN forms after the rare earth gas permeation and Gd3＋are diffused as substitution ions into the crystal lattice of MoN, and the surface valence of elemental content was measured by XPS. The conductivity results by direct current（DC） four-probe method show that MoN obtained from the Gd thermal permeation exhibits conductor character in the temperature range of 298–740 K and semiconductor behavior in 740–800 K.

关键词： Rare earth permeation MoN Conductivity Gd

A Novel Tuning Method for Predictive Control of VAV Air Conditioning System Based on Machine Learning and Improved PSO

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Journal of Beijing Institute of Technology 2022年第4期31卷 350-361页

作者： Ning He kun xi Mengrui Zhang Shang Li School of Mechanical and Electrical Engineering Xi’an University of Architecture and TechnologyXi’an 710055China

The variable air volume(VAV)air conditioning system is with strong coupling and large time delay,for which model predictive control(MPC)is normally used to pursue performance *** at the difficulty of the parameter selection of VAV MPC controller which is difficult to make the system have a desired response,a novel tuning method based on machine learning and improved particle swarm optimization(PSO)is *** this method,the relationship between MPC controller parameters and time domain performance indices is established via machine *** the PSO is used to optimize MPC controller parameters to get better performance in terms of time domain *** addition,the PSO algorithm is further modified under the principle of population attenuation and event triggering to tune parameters of MPC and reduce the computation time of tuning ***,the effectiveness of the proposed method is validated via a hardware-in-the-loop VAV system.

关键词： model predictive control(MPC) parameter tuning machine learning improved particle swarm optimization(PSO)

Comprehensive evaluation of tolerance to alkali stress by 17 genotypes of apple rootstocks

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Journal of Integrative Agriculture 2016年第7期15卷 1499-1509页

作者： ZHANG kun-xi WEN Tian DONG Jun MA Feng-wang BAI Tuan-hui WANG kun LI Cui-ying State Key Laboratory of Crop Stress Biology for Arid Areas/College of Horticulture Northwest A&F University College of Horticulture Henan Agricultural University Institute of Pomology Chinese Academy of Agricultural Sciences

Alkaline soils have a great inlfuence on apple production in Northern China. Therefore, comprehensive evaluations of toler-ance to such stress are important when selecting the most suitable apple rootstocks. We used hydroponics culturing to test 17 genotypes of apple rootstocks after treatment with 1：1Na2CO3and NaHCO3. When compared with the normaly grown controls, stressed plants produced fewer new leaves, and had shorter roots and shoots and lower fresh and dry weights after 15 d of exposure to alkaline conditions. Their root/shoot ratios were also reduced, indicating that the roots had been severely damaged. For al stressed rootstocks, electrolyte leakage （EL） and the concentration of malondialdehyde （MDA） increased while levels of chlorophyl decreased. Changes in root activity （up or down）, as wel as the activities of peroxidase （POD）, superoxide dismutase （SOD）, and catalase （CAT） were rootstock-dependent, possibly relfecting their differences in alkali tolerance. Using alkali injury index （AI）, adversity resistance coefifcients （ARC）,cluster analysis, and evaluation of their physiological responses, we classiifed these 17 genotypes into three groups：（1） high tolerance： Hubeihaitang, Wushanbianyehaitang, Laoshanhaitang Ls2, xiaojinbianyehaitang, and Fupingqiuzi; （2） moderate tolerance： Pingyitiancha, Laoshanhaitang Ls3, Hubeihaitang A1, Deqinhaitang, Balenghaitang, Maoshandingzi, Shandingzi, and xinjiangyepingguo; or （3） low tolerance： Pingdinghaitang, Hongsanyehaitang, xiaojinhaitang, and Sanyehaitang. These results wil signiifcantly contribute to the selection of the most suitable materials for rootstocks with desired levels of tolerance to alkali stress.

关键词： alkali stress apple rootstock alkali tolerance

Effective-Field Theory on High Spin Systems with Biaxial Crystal Field

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Communications in Theoretical Physics 2006年第6X期46卷 1105-1108页

作者： JIANG Wei GUO An-Bang LI xin WANG xi-kun BAI Bao-Dong College of Sciences Shenyang University of Technology Shenyang 110023 China School of Electrical Engineering Shenyang University of Technology Shenyang 110023 China

Based on the effective-field theory with self-spin correlations and the differential operator technique, physical properties of the spin-2 system with biaxial crystal field on the .simple cubic, body-centered cubic, as well as faced-centered lattice have been studied. The influences of the external longitudinal magnetic field on the magnetization, internal energy, specific heat, and susceptibility have been discussed in detail The phenomenon that the magnetization in the ground state shows quantum effects produced by the biaxial transverse crystal field has been found.

关键词： effective-field theory magnetic properties biaxial crystal field quantum effects

Expression and prognosis of inducible T-cell co-stimulator and its ligand in Chinese stage I–III lung adenocarcinoma patients

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Animal Models and Experimental Medicine 2023年第5期6卷 464-473页

作者： xiao-Kai Zhan xi-kun Liu Sen Zhang Hong Chen Division of Oncology and Hematology Beijing Chao-Yang HospitalCapital Medical UniversityBeijingP.R.China State Key Laboratory of Bioactive Substances and Functions of Natural Medicines Institute of Materia MedicaChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijingP.R.China Pathology Department Beijing Chao-Yang HospitalCapital Medical UniversityBeijingP.R.China

Background:Immunotherapy has become the fastest-adopting treatment paradigm for lung cancer with improved *** binding with its ligand(inducible T-cell costimulator and its ligand[ICOSL]),an inducible T-cell co-stimulator(ICOS)could contribute to reversing immunosuppression and improving immune response and thus be a potential target for cancer ***:We selected 54 formalin-fixed,paraffin-embedded tumor tissues from cases with stage I–III lung adenocarcinoma *** expression of ICOS and ICOSL was *** correlation with clinical parameters in Chinese patients was also compared with TCGA ***:The positive rates of ICOS and ICOSL were 68%and 81.5%,respectively,in lung tumor *** these,9 cases had a low expression of ICOS,and 22 cases had a high expression of ICOS;ICOSL expression was low in 20 cases and high in 24 *** to the International Association for the Study of Lung Cancer(8th edition),phase I lesions were detected in 21 cases,phase II lesions in 15 cases,and phase III lesions in 18 *** median survival time of all patients was 44.5 months,and the median disease-free survival was 32 *** analysis showed that the factors significantly associated with overall survival were tumor size,regional lymph node involvement,stage,and expression level of ICOS/*** analysis using log-rank test indicated that the lower ICOS+cell infiltration may predict poor prognosis,whereas lower ICOSL protein expression may be associated with better prognosis,but ICOSL data need further validation in larger samples due to inconsistency in TCGA mRNA ***:ICOS/ICOSL might be associated with prognosis of lung cancer,and ICOS and its ligand may be potential therapeutic targets in non-small cell lung cancer.

关键词： Chinese patients ICOS ICOSL lung adenocarcinoma prognostic factor

Magnetizations of Multisublattice Bilayer System

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Communications in Theoretical Physics 2008年第4期49卷 1055-1058页

作者： JIANG Wei LIU Chuan WANG Wei ZHANG Fan LIU Cong WANG xi-kun College of Sciences Shenyang University of Technology Shenyang 110023 China

Magnetizations of four sublattice bilayer system have been systematically investigated by the use of effectivefield theory with self-spin correlations and differential operator technique. The effects of the crystal field, longitudinal magnetic field, and intra- and inter-monolayer interaction constants on magnetizations axe examined in detail. Some interesting results are obtained, which may potentially be related to experimental work.

关键词： four sublattices magnetizations effective-field theory