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Journal of Materials Science & Technology 2017年第8期33卷 763-767页

作者： Haoxiang Zhong Jidian Lu Aiqin He Minghao Sun Jiarong He Lingzhi Zhang Key Laboratory of Renewable Energy Guangdong Key Laboratory of New and Renewable Energy Research and DevelopmentGuangzhou Institute of Energy ConversionChinese Academy of SciencesGuangzhou 510640China guangzhou Lithium Force Energy Technology Co. LtdGuangzhou 510730China University of Chinese Academy of Sciences Beijing 100039China

Carboxymethyl chitosan/poly（ethylene oxide）（CCTS/PEO） composite is firstly reported as a water soluble binder for the application of 5V LiNi0.5Mn1.5O4 cathode in Li-ion batteries. Both CCTS and PEO show a high electrochemical oxidation potential of above 5.0 V（vs. Li/Li＋）. The electrochemical performances of LiNi0.5Mn1.5O4（LNMO） cathodes with CCTS/PEO composite binders of different mass rates are investigated, it is found that LiNi0.5Mn1.5O4 cathode with an optimized CCTS/PEO（85/15, w/w） composite exhibits a slightly better cycling performance than that of polyvinylidene fluoride（PVDF）, retaining 81.4% capacity as compared with 79.8% for PVDF at 0.5C rate after 200 cycles. LNMO with PEO/CCTS（85/15,w/w） exhibited the better rate capability than that of PVDF. These results demonstrate that CCTS/PEO composite can be potentially used as a water-soluble binder for 5 V LNMO cathode.

关键词： Carboxymethyl chitosan Poly(ethylene oxide) Water soluble binder LiNi0.5Mn1.5O4 Lithium ion battery

Improved the biocompatibility of cancellous bone with compound physicochemical decellularization process

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Regenerative Biomaterials 2020年第5期7卷 443-451页

作者： You Ling Weikang Xu Lifeng Yang Changyan Liang Bin Xu National Engineering Research Center for Human Tissue Restoration and Function Reconstruction School of Materials Science and EngineeringSouth China University of TechnologyGuangzhou Higher Education Mega CentrePanyu DistrictGuangzhouGuangdong 510006China Department of Scientific Research National Engineering Research Center for Healthcare DevicesGuangdong Key Lab of Medical Electronic Instruments and Polymer Material ProductsGuangdong Institute of Medical InstrumentsGuangdong Academy of SciencesNo.1307 Guangzhou Avenue CentralTianhe DistrictGuangzhouGuangdong 510500China National Engineering Laboratory for Regenerative Implantable Medical Devices R&D CenterGrandhope Biotech Co.LtdGuangzhouGuangdong 510530China Department of Biosecurity Evaluation Guangdong Medical Devices Quality Surveillance and Test InstituteNo.1 Guangpu West RoadHuangpu DistrictGuangzhouGuangdong 510663China Department of Gynecology Third Affiliated Hospital of Sun Yat-sen UniversityNo.600 Tianhe RoadTianhe DistrictGuangzhou 510630China

Due to the unique microstructures and components of extracellular matrix(ECM),decellularized scaffolds had been used widely in *** reaction of the host toward decellularized scaffolds depends on their biocompatibility,which should be satisfied before applied in *** aim of this study is to develop a decellularized xenograft material with good biocompatibility for further bone repair,in an effective and gentle *** existing chemical and physical decellularization techniques including ethylene diamine tetraacetic acid(EDTA),sodium dodecyl sulfate(SDS)and supercritical carbon dioxide(SC-CO2)were combined and modified to decellularize bovine cancellous bone(CB).After decellularization,almost 100%of A-Gal epitopes were removed,the combination of collagen,calcium and phosphate was *** direct and indirect contact with macrophages was used to evaluate the cytotoxicity and immunological response of the *** stem cells(MSCs)were used in the in vitro cells’proliferation *** decellularized CB was proved has no cytotoxicity(grade 1)and no immunological response(NO,IL-2,IL-6 and TNF-α secretion inhibited),and could support MSCs proliferated *** results were similar to that of commercial decellularized human *** study suggests the potential of using this kind of combine decellularization process to fabricate heterogeneous ECM scaffolds for clinical application.

关键词： extracellular matrix cancellous bone physicochemical decellularization biocompatibility

Late Pleistocene spore-pollen record and climatic change at the Chongphadae Cave Site,Democratic People's Republic of Korea

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Journal of Palaeogeography 2023年第4期12卷 624-636页

作者： Se Chan Kim Rye Sun Choe Il Nam Kim Chol U Ryong Il Kang Institute of Human Evolution and development History Faculty of HistoryKim Il Sung UniversityTaesong DistrictPyongyangDemocratic People's Republic of Korea

We present a detailed pollen record and interpretations of late Pleistocene climatic change at the Chongphadae Cave Site, Democratic People's Republic of Korea. The mean annual paleotemperature and mean annual paleoprecipitation of the site were calculated using the temperature index and precipitation index based on ecological features and geographical distribution of each taxon. Temperature index and precipitation index range from 8.8℃ to 10.4℃ and from 805.0 mm to 963.1 mm, respectively. Four dates(radiocarbon, uranium series, fission track, and paleomagnetic excursion dating) of the deposit profile investigated yield a range of ~21.3 ka BP to ~117 ka BP, geochronologically corresponding to the late Pleistocene, and extend from the last interglacial highstand through the Last Glacial Maximum. Our results are thus consistent with the climatic shift from interglacial to glacial conditions, provide evidence that the environments of the region, which was reconstructed from the paleoclimatic index, changed from a mild and humid to a cool and dry climate during the late Pleistocene, and suggest trends similar to those of several parts of the Northern Hemisphere which lie in the same latitudinal zone as our study area.

关键词： Chongphadae cave Pollen Climatic change Late Pleistocene Mean annual temperature Mean annual precipitation

Kinetic study of the hydrocarbon generation from Upper Paleozoic coals in Ordos Basin

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Science China Earth Sciences 2003年第4期46卷 333-341页

作者：付少英彭平安张文正刘金钟李剑峰昝川莉 State Key Laboratory of Organic Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sci-ences guangzhou Marine Geological Survey Ministry of Land and Resources Guangzhou 510760 China Analysis Center Research Institute of Exploration and Development Changqing Petroleum Oilfield

Kinetic parameters were characterized for the formation of the C1—C5 hydrocarbons generating from Taiyuan and Shanxi coal in the Upper Paleozoic of the Ordos Basin, through pres-surized simulation experiment designed for the kinetic study of hydrocarbon generation. Based on the palaeogeothermal evolution of the Upper Paleozoic strata in the Ordos Basin, the formation and evolution of gas from Taiyuan and Shanxi coal in the eastern and central regions of the Ordos Basin were reproduced, and it is suggested that large scale secondary hydrocarbon generation does not exist during the uplifting and cooling process of the basin at the end of Early Cretaceous. Some of the factors affecting the behavior of the coal-generated gas were also discussed, and it is emphasized that the most fundamental element determining the hydrocarbon generation behavior is the characteristic of the precursor hydrocarbon-source rock.

关键词： Ordos Basin, Taiyuan coal, Shanxi coal, hydrocarbon generation kinetics, simulation experiment.

Concurrent adsorption and reduction of chromium(Ⅵ)to chromium(Ⅲ)using nitrogen-doped porous carbon adsorbent derived from loofah sponge

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Frontiers of Environmental Science & Engineering 2022年第5期16卷 27-37页

作者： Feng Chen Shihao Guo Yihao Wang Lulu Ma Bing Li Zhimin Song Lei Huang Wen Zhang School of Environmental and Biological Engineering Henan University of EngineeringZhengzhou 451191China School of Environmental Science and Engineering Guangzhou UniversityGuangzhou 510006China guangzhou University-Linköping University Research Center on Urban Sustainable development Guangzhou UniversityGuangzhou 510006China John A.Reif Jr.Department of Civil and Environmental EngineeringNew Jersey Institute of TechnologyNewarkNJ 07102USA

To develop highly effective adsorbents for chromium removal,a nitrogen-doped biomass-derived carbon(NHPC)was synthesized via direct carbonation of loofah sponge followed by alkali activation and doping *** possessed a hierarchical micro-/mesoporous lamellar structure with nitrogen-containing functional groups(1.33 at%),specific surface area(1792.47 m2/g),and pore volume(1.18 cm^(3)/g).NHPC exhibited a higher Cr(Ⅵ)adsorption affinity than the HPC(without nitrogen doping)or the pristine loofah sponge carbon(LSC)*** influence of process parameters,including pH,dosage,time,temperature,and Cr(Ⅵ)concentration,on Cr(Ⅵ)adsorption by NHPC were *** Cr(Ⅵ)adsorption kinetics matched with the pseudo-second-order model(R^(2)≥0.9983).The Cr(Ⅵ)adsorption isotherm was fitted with the Langmuir isotherm model,which indicated the maximum Cr(Ⅵ)adsorption capacities:227.27,238.10,and 285.71 mg/g at 298K,308K,and 318K,*** model analysis also indicated that adsorption of Cr(Ⅵ)on NHPC was a spontaneous,endothermal,and entropy-increasing *** Cr(Ⅵ)adsorption process potentially involved mixed reductive and adsorbed ***,computational chemistry calculations revealed that the adsorption energy between NHPC and Cr(VI)(-0.84 eV)was lower than that of HPC(-0.51 eV),suggesting that nitrogen doping could greatly enhance the interaction between NHPC and Cr(VI).

关键词： Chromium(Ⅵ) Nitrogen-doped porous carbon Adsorption Reduction Loofah sponge

Preliminary study on the safety and efficacy of a new polymyxin B-immoblized resin column in treatment of LPS-induced sepsis beagles

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Animal Models and Experimental Medicine 2022年第2期5卷 161-171页

作者： Yonggui Li Zhenggen Yang Jialiang Hu Zhennan Lin Research and development Center Guangzhou Koncen Bioscience Co.Ltd.GuangzhouPR China Guangdong Provincial Key Laboratory of Hemoadsorption Technology GuangzhouPR China

Background:This study aims to assess the safety and efficacy of direct hemoperfu-sion using a new polymyxin B-immobilized resin column(disposable endotoxin ad-sorber,KCEA)in an endotoxin/lipopolysaccharide(LPS)-induced sepsis ***:Eighteen beagles were randomized into 1 intervention group(KCEA group,n=6)and 2 control groups(sham group and model group,n=6 each).Sepsis was in-duced by continuous intravenous application of 0.5 mg/kg body weight of endotoxin for 60 *** extracorporeal hemoperfusion device made with KCEA for endotoxin adsorption was *** group beagles received standard treatment with fluids and vasoactive drugs,KCEA group beagles received standard treatment and direct hemoperfusion of KCEA for 2 h,and sham group beagles were treated with standard treatment and direct hemoperfusion of a sham column for 2 ***:Good blood compatibility of KCEA was confirmed by assessing clinical *** endotoxin peak levels in the KCEA group were significantly lower,resulting in a significant suppression of IL-6,TNF-αand procalcitonin,which improved mean arterial pressure and significantly lowered vasopressor demand,thereby pro-tecting organ function and improving survival time and *** the KCEA group,MAP was significantly higher over 6 h than those recorded both in the sham group and model *** 7-day survival rates of the KCEA,sham and model groups were 50%,0%and 0%,***:KCEA hemoadsorption was effective at detoxifying circulatory endotoxin and inflammatory mediators and contributed to the decreased mortality rate in the sepsis beagles.

关键词： endotoxin hemoadsorption polymyxin B sulfate resin sepsis

Decomposition behaviors of methane hydrate in porous media below the ice melting point by depressurization

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Chinese Journal of Chemical Engineering 2019年第9期27卷 2207-2212页

作者： Yu Zhang Tian Wang Xiaosen Li Kefeng Yan Yi Wang Zhaoyang Chen guangzhou Institute of Energy Conversion Key Laboratory of Gas HydrateChinese Academy of SciencesGuangzhou 510640China Guangdong Provincial Key Laboratory of New and Renewable Energy Research and development Guangzhou 510640China guangzhou Center for Gas Hydrate Research Chinese Academy of SciencesGuangzhou 510640China University Science&Technology of China Nano Science&Technology InstituteSuzhou 215123China

The decomposition behaviors of methane hydrate below the ice melting point in porous media with different particle size and different pore size were *** silica gels with the particle size of 105–150μm,150–200μm and 300–450μm,and the mean pore diameters of 12.95 nm,17.96 nm and 33.20 nm were used in the *** recovery and temperature change curves were determined for each *** hydrate decomposition process in the experiments can be divided into the depressurization period and the isobaric *** temperature in the system decreases quickly in the depressurization process with the hydrate decomposition and reaches the lowest point in the isobaric *** hydrate decomposition in porous media below ice-melting point is very fast and no self-perseveration effect is *** hydrate decomposition is influenced both by the driving force and the initial hydrate *** the experiments with the high hydrate saturation,the hydrate decomposition will stop when the pressure reaches the equilibrium dissociation *** stable pressure in the experiment with high hydrate saturation exceeds the equilibrium dissociation pressure of bulk hydrate and increases with the decrease of the pore size.

关键词： Methane hydrate Depressurization Porous media Decomposition Ice-melting point

Burden among caregivers for children with asthma:A mixed-method study in guangzhou,China

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International Journal of Nursing Sciences 2015年第4期2卷 394-401页

作者： Miaolan Guo Guozhen Gao Jinlan Guo Litao Wen Liting Zeng School of Nursing Guangzhou Medical UniversityGuangzhouChina Department of Nursing The First Affiliated Hospital of Guangzhou Medical UniversityGuangzhouChina School of Nursing Guangdong Medical CollegeScience and Technology DistrictDongguanChina

Objective:Research suggests that caregivers of children with asthma experience a substantial amount of stress,though no comprehensive study examines this *** we both quantitatively and qualitatively examined the burden on caregivers of children with ***:Surveys were administered to 138 caregivers of asthmatic children by convenience *** Zarit Caregiver Burden Interview(ZBI)was used to assess the degree of caregiver *** addition,13 qualitative semi-structured interviews were carried out via purposive sampling and were used to explore the perception of *** and content analysis were used to analyze quantitative and qualitative data,***:We found that caregiver burden(mean=31.56±14.19)ranged from 24%with no or mild burden,52%with mild to moderate burden,22%with moderate to severe burden and 2%with very severe *** burden was also assessed as 5 different *** ranked most burdensome(2.09±1.05),followed by sacrifice(1.57±0.94),embarrassment/anger(1.30±0.80),dependency(1.21±0.77),and lastly,loss of control(1.20±0.84).The highest individually scored item on the ZBI was“fear of the future of the relative”(mean=3.04).Interviews of caregiver burden were summarized into three main themes,namely:1)life is too chaotic;2)negative emotions;and 3)gaps in themedical support ***:These findings expand our understanding about the burden caregivers of children with asthma face,and may help to propose targeted strategies to help caregivers adapt to their roles,and maintain and promote the health of themselves and their families.

关键词： Child with asthma Caregiver burden Qualitative study Quantitative study

Efficient production of ethyl levulinate from cassava over Al2(SO4)3 catalyst in ethanol–water system

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Journal of Energy Chemistry 2017年第1期26卷 115-120页

作者： Jin Tan Qiying Liu Lungang Chen Tiejun Wang Longlong Ma Guanyi Chen School of Environmental Science and Engineering Tianjin UniversityTianjin 300072China Key Laboratory of Renewable Energy Guangzhou Institute of Energy ConversionChinese Academy of SciencesGuangzhou 510640GuangdongChina Guangdong Key Laboratory of New and Renewable Energy Research and development Guangzhou 510640GuangdongChina

One-pot achievement of ethyl levulinate from cassava was conducted in ethanol–water system over several simple sulfate salt catalysts. Al2(SO4)3catalyst had the best performance in synthesizing ethyl levulinate comparing with those of a series of sulfate salts. The highest yields of ethyl levulinate was up to 39.27% as well as 7.78% levulinate acid when cassava was catalyzed in ethanol medium by adding 10 wt% water.13C and1H NMR spectroscopic investigations confirmed that isomerization of glucose to fructose over Al2(SO4)3catalyst is an important step in producing ethyl levulinate and levulinate acid. Due to aggregations of Al3+under hydrothermal conditions, tiny amount of Al3+were detected in filtrate at the percentage of 0.32% even if in absolute water. Brønsted and Lewis acids could improve the yield of ethyl levulinate and levulinate acid by synergistic effect. All results suggested that Al2(SO4)3was a simple and efficient catalyst for ethyl levulinate and levulinate acid production. © 2016 Science Press

关键词： Catalysts Ethanol Plants (botany) Sulfur compounds Waterworks

Rural vulnerability in China:Evaluation theory and spatial patterns

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Journal of Geographical Sciences 2021年第10期31卷 1507-1528页

作者： YANG Ren PAN Yuxin School of Geography and Planning Sun Yat-sen UniversityGuangzhou 510275China China Regional Coordinated development and Rural Construction Institute Sun Yat-sen UniversityGuangzhou 510275China

An indicator system is constructed and applied for comprehensive measurement of rural vulnerability in China’s *** the selection of five representative transects we explore regional differences in,and driving forces of,China’s rural *** results show that(1)The rural vulnerability of counties in China is generally within the threshold range of low to medium,and exhibits obvious spatial *** the"Bole-Taipei Line",there is a spatial pattern of north-south *** in the northeast part of the counties have low vulnerability,while those in the southwest are relatively vulnerable(2)External environmental phenomena are the leading factors that induce rural ***,the rural ecological subsystem composed of ecological exposure,ecological sensitivity,and ecological adaptation is the principal determinant of rural *** rural economic subsystem composed of economic exposure,economic sensitivity,and economic adaptation is also a core determinant of rural *** social subsystem composed of social exposure,social sensitivity,and social adaptation is also an important determinant of rural vulnerability.(3)According to the principle of adapting measures to local conditions,different regions should seek to reduce regional embeddedness and path *** should strengthen the prediction and monitoring of sources of disturbance in rural areas,and scientifically control the sensitivity of the system *** the adaptive capacity of the rural system can be improved pursuant of promoting sustainable development.

关键词： rural vulnerability rural regional system rural sustainable development rural revitalization rural geography China