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Thermo-responsive and Antifouling PVDF Nanocomposited Membranes Based on PNIPAAm Modified TiO_2 Nanoparticles

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Chinese Journal of Polymer Science 2014年第7期32卷 892-905页

作者： qing zhou 李建华 Bang-feng Yan 吴东张其清 Institute of Biomedical and Pharmaceutical Technology and College of Chemistry and Chemical Engineering Fuzhou University School of Stomatology Affiliated Stomatological HospitalFujian Medical University

A novel hydrophilic nanocomposite additive （TiO2-g-PNIPAAm） was synthesized by the surface modification of titanium dioxide （TiO2） with N-isopropylacrylamide （NIPAAm） via ＂graft-from＂ technique. And the nanocomposite membrane of poly（vinylidene fluoride）（PVDF）/TiO2-g-PNIPAAm was fabricated by wet phase inversion. The graft degree was obtained by thermo-gravimetric analysis （TGA）. Fourier transform infrared attenuated reflection spectroscopy （FTIR-ATR） and X-ray photoelectronic spectroscopy （XPS） characterization results suggested that TiO2-g-PNIPAAm nanoparticles segregated on membrane surface during the phase separation process. Scanning electron microscopy （SEM） was conducted to investigate the surface and cross-section of the modified membranes. The water contact angle measurements confirmed that TiO2-g-PNIPAAm nanoparticles endowed PVDF membranes better hydrophlilicity and thermo-responsive properties compared with those of the pristine PVDF membrane. The water contact angle decreased from 92.8~ of the PVDF membrane to 61.2~ of the nanocompostie membrane. Bovine serum albumin （BSA） static and dynamic adsorption experiments suggested that excellent antifouling properties of membranes was acquired after adding TiO2-g- PNIPAAm. The maximum BSA adsorption at 40℃ was about 3 times than that at 23 ℃. The permeation experiments indicated the water flux recover ratio and BSA rejection ratio were improved at different temperatures.

关键词： PVDF membrane TiO2-g-PNIPAAm nanoparticle Thermo-responsive Antifouling.

Responses of antioxidant enzyme and photosynthesis in rape seedling to the combined stresses of acid rain and ultraviolet-B radiation

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Journal of Environmental Sciences 2005年第6期17卷 1038-1041页

作者： LIANG Chan-juan HUANG Xiao-hua TAO Wen-yi zhou qing The Key Laboratory of Industrial Biotechnology Ministry of Education Southern Yangtze University Wuxi 214036 China College of Chemistry and Environmental Science Nanjing Normal University Nanjing 210097 China School of Biotechnology Southern Yangtze University Wuxi 214036 China

Effects of the simulated acid rain（AR） and ultraviolet-B（UV-B, 280-320 nm） radiation with a single or two ways simultaneously （AR ＋ UV-B） on the antioxidant enzyme and photosynthesis of the rape seedlings were investigated by the hydroponic culture. The results of static experiment indicated that the tolerance of rape seedling to single stress（AR or UV-B） is stronger than that to dual stresses（AR ＋ UV-B）. Furthermore, the dual stresses had additive effect on catalase activity, and a synergistic effect on MDA content, net photosynthesis rate, water use efficiency as well as intercellular CO2 concentration. Meanwhile, it has an independent effect on chlorophyll content, stomatal conductance, and transpiration rate as well as membrane permeability. During 64 h restoration course, the dynamic change in the curves of physiological and biochemical indices were not identical, and none of them show a simple linear variation. According to the static and dynamic experiments, it was found that a responsive sequence of catalase activity, membrane permeability, MDA content and photosynthetic characteristics to the above-mentioned stresses was as follows： AR ＋ UV-B 〉 UV-B 〉 AR.

关键词： combined stresses elevated UV-B radiation simulated acid rain rape seedling CAT activity photosynthesis

Effects of cerium on growth and physiological mechanism in plants under enhanced ultraviolet-B radiation

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Journal of Environmental Sciences 2006年第1期18卷 125-129页

作者： LIANG Chan-iuan HUANG Xiao-hua TAO Wen-yi zhou qing The Key Laboratory of Industrial Biotechnology Ministry of Education Southern Yangtze University Wuxi 214036 China School of Biotechnology Southern Yangtze University Wuxi 214036 China College of Chemistry and Environmental Science Nanjing Normal University Nanjing 210097 China

Effect of cerium （Ce^3＋） on the growth, photosynthesis and antioxidant enzyme system in rape seedlings （Brassica juncea L.） exposed to two levels of UV-B radiation （T1： 0.15 W/m^2 and T2：0.35 W/m^2） was studied by hydroponics under laboratory conditions. After 5 d of UV-B treatment, the aboveground growth indices were obviously decreased by 13.2%-44. 1%（T1） and 21.4%-49.3% （T2）, compared to CK, and except active absorption area of roots, the belowground indices by 14.1%-35.6%（T1） and 20.3%-42.6% （T2）. For Ce＋UV-B treatments, the aboveground and belowground growth indices were decreased respectively by 4.1%-23.6%, 5.2% -23.3%（Ce＋T1） and 10.8%-28.4%, 7.0%-27.8%（Ce＋T2）, lower than those of UV-B treatments. The decrease of growth indices appeared to be the result of changes of physiological processes. Two levels of UV-B radiation induced the decrease in chlorophyll content, net photosynthesis rate, transpiration rate, stomatal conductance and water use efficiency by 11.2%-25.9%（T1） and 20.9%- 56.9%（T2）, whereas increase in membrane permeability and activities of antioxidant enzymes including superoxide dismutase（SOD）, catalase （CAT） and peroxidase （POD） by 6.9%, 22.8%, 21.5%, 9.5%（T1） and 36.6%, 122.3%, 103.5%, 208.9%（T2）, respectively. The reduction of the photosynthetic parameters in Ce＋UV-B treatments was lessened to 3.2%-13.8%（Ce＋T1） and 4.9%-27.6%（Ce＋T2）, and the increase of membrane permeability and activities of antioxidant enzymes except POD in the same treatments were lessened to 2.4%, 8.4%, 6.6%（Ce＋T1） and 30.1%, 116.7%, 75.4%（Ce＋T2）. These results indicate that the regulative effect of Ce on photosynthesis and antioxidant enzymatic function is the ecophysiological basis of alleviating the suppression of UV-B radiation on growth of seedlings. Furthermore, the protective effect of Ce on seedlings exposed to TI level of UV-B radiation is superior to T2 level.

关键词： cerium(Ce^3+) UV-B radiation rape growth photosynthesis antioxidant enzyme system

Blue Luminescent Zinc(II)-and Cadmium(II)-1,4-phenylenediacetate Complexes

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Chinese Journal of Structural Chemistry 2006年第10期25卷 1161-1166页

作者： XU Yan-qing zhou You-Fu YUAN Da-Qiang HONG Mao-Chun State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter The Chinese Academy of Sciences Fuzhou Fujian 350002 China

Two mixed-ligand polymeric complexes formulated as {[Zn（pda）（bpy）]·0.5H2O}n （pda = 1,4-phenylenediacetate, bpy = 2,2＇-bipyridine） 1 and {[Cd（pda）（bpy）]·1.5H2O}n 2 have been hydrothermally synthesized. Single-crystal X-ray diffraction analyses reveal that the structures of complexes 1 and 2 possess similar one-dimensional zigzag chains. Crystal data for compound 1： monoclinic, space group P21/c, a = 15.965（2）, b = 8.305（1）, c= 14.856（2） °A, β= 111.048（2）°, Mr = 422.73, V = 1838.2（4）°A^3, Z = 4, Dc = 1.528 g/cm^3, μ= 1.368 mm^-1, F（000） = 868, the final R = 0.0783 and wR = 0.1469 （w =1/[σ^2（Fo^2）＋（0.0351P）^2＋ 8.0014P], where P = （Fo^2 ＋ 2Fc^2）/3） based on 2025 observed reflections with I〉 2σ（I）; and those for compound 2： monoclinic, space group C2/c, a = 29.921 （7）, b = 8.5400（17）, c = 15.320（3） °A,β= 99.59（3）°, Mr = 487.75, V = 3859.9（14） °A^3, Z = 8, Dc = 1.668 g/cm^3, μ= 1.169 mm^-1, F（000） = 1936, the final R = 0.0723 and wR = 0.1612 （w = 1/[σ^2（Fo^2）＋（0.0681P）^2 ＋ 55.9577P], where P = （Fo^2 ＋ 2Fc^2）/3） based on 2130 observed reflections with I〉 2σ（I）. Fluorescent analyses show that both complexes exhibit intense blue luminescence （λmax = 485 nm for 1 and 475 nm for 2） upon excitation at 330 nm.

关键词： zinc(Ⅱ) cadmium(Ⅱ) crystal structure,coordination polymer fluorescence

Nonlinear Elastic Constitutive Model of Soil-Structure Interfaces Under Relatively High Normal Stress

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Journal of China University of Mining and Technology 2007年第3期17卷 301-305页

作者： zhou Guo-qing XIA Hong-chun ZHAO Guang-si zhou Jie School of Architecture and Civil Engineering China University of Mining ＆ Technology Xuzhou Jiangsu China221008 State Key Laboratory for Geomechanics ＆ Deep Underground Engineering China University of Mining ＆ Technology Xuzhou Jiangsu China221008 School of Architecture and Civil Engineering Liaocheng University Liaocheng Shandong China252059

The shear characteristics of soil-structure interfaces with different roughness are studied systematically by us-ing the DRS-1 high normal stress and residual shear apparatus. The experimental results indicate that,under a relatively high normal stress,normal stress and the coefficient of structural roughness are the most important factors affecting the mechanical interface characteristics. The relationship between shear stress and shear displacement of the soil-structure interface is a hyperbolic curve with high regression accuracy. Based on our experimental results,a nonlinear elastic con-stitutive model of the soil-structure interface under relatively high normal stress is established with a definite physical meaning for its parameters. The model can predict the strain hardening behavior of the soil during the shearing process. The results show an encouraging agreement with experimental data from direct shear tests.

关键词： high normal stress standard medium sand interface strain hardening constitutive model

Well logging evaluation of fine-grained hydrate-bearing sediment reservoirs: Considering the effect of clay content

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Petroleum Science 2023年第2期20卷 879-892页

作者： Lin-Qi Zhu Jin Sun Xue-qing zhou qing-Ping Li Qi Fan Song-Lin Wu Shi-Guo Wu Laboratory of Marine Geophysics and Georesources of Hainan Province Institute of Deep-sea Science and EngineeringChinese Academy of SciencesSanya572000HainanChina Laboratory for Marine Geology Qingdao National Laboratory for Marine Science and TechnologyQingdao266061ShandongChina Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) ZhuhaiGuangdong519000China State Key Laboratory of Natural Gas Hydrates Beijing100028China China National Offshore Oil Corporation Research Institute Co.Ltd. Beijing100028China

Hydrate reservoirs are different from the host reservoirs of all other fossil energy sources because the characteristics of hydrate reservoirs are generally controlled by deep-sea fine-grained sedimentation. In such reservoirs, the reliability of the classical logging evaluation models established for diagenetic reservoirs is questionable. This study used well W8 in the Qiongdongnan Basin to explore the clay content, porosity, saturation, and hydrate-enriched layer identification of a logging-based hydrate reservoir, and it was found that considering the effect of the clay content on the log response is necessary in the logging evaluation of hydrate reservoirs. In the evaluation of clay content, a method based on the optimization inversion method can obtain a more reliable clay content than other methods. Fine-grained sediment reservoirs have a high clay content, and the effect of clay on log responses must be considered when calculating porosity. In addition, combining density logging and neutron porosity logging data can obtain the best porosity calculation results, and the porosity calculation method based on sonic logging predicted that the porosity of the studied reservoir was low. It was very effective to identify hydrate layers based on resistivity, but the clay distribution and pore structure will also affect the relationship between resistivity, porosity and saturation, and it was suggested that the factors effecting the resistivity of different layers should be considered in the saturation evaluation and that a suitable model should be selected. This study also considered the lack of clarity of the relationships among the lithology, physical properties, hydrate-bearing occurrence properties, and log response properties of hydrate reservoirs and the lack of specialized petrophysical models. This research can directly help to improve hydrate logging evaluation.

关键词： Gas hydrate Well logging Porosity Saturation Shale distribution form

Integrating Remote Sensing and Proximal Sensors for the Detection of Soil Moisture and Salinity Variability in Coastal Areas

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Journal of Integrative Agriculture 2013年第4期12卷 723-731页

作者： GUO Yan SHI zhou zhou Lian-qing JIN Xi TIAN Yan-feng TENG Hong-fen Institute of Agricultural Remote Sensing and Information Technology Application College of Environmental and Resource Sciences Zhejiang University

Soil moisture and salinity are two crucial coastal saline soil variables, which influence the soil quality and agricultural productivity in the reclaimed coastal region. Accurately characterizing the spatial variability of these soil parameters is critical for the rational development and utilization of tideland resources. In the present study, the spatial variability of soil moisture and salinity in the reclaimed area of Hangzhou gulf, Shangyu City, Zhejiang Province, China, was detected using the data acquired from radar image and the proximal sensor EM38. Soil moisture closely correlates radar scattering coefficient, and a simplified inversion model was built based on a backscattering coefficient extracted from multi-polarization data of ALOS/PALSAR and in situ soil moisture measured by a time domain reflectometer to detect soil moisture variations. The result indicated a higher accuracy of soil moisture inversion by the HH polarization mode than those by the HV mode. Soil salinity is reflected by soil apparent electrical conductivity （ECa）. Further, ECa can be rapidly detected by EM38 equipment in situ linked with GPS for characterizing the spatial variability of soil salinity. Based on the strong spatial variability and interactions of soil moisture and salinity, a cokriging interpolation method with auxiliary variable of backscattering coefficient was adopted to map the spatial variability of ECa. When compared with a map of ECa interpolated by the ordinary kriging method, detail was revealed and the accuracy was increased by 15.3%. The results conclude that the integrating active remote sensing and proximal sensors EM38 are effective and acceptable approaches for rapidly and accurately detecting soil moisture and salinity variability in coastal areas, especially in the subtropical coastal zones of China with frequent heavy cloud cover.

关键词： remote sensing proximal sensor soil moisture salinity backscattering coefficient soil apparent electricalconductivity (ECa)

Advances in anti-inflammatory and immunoregulatory mechanisms of sinomenine

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Traditional Medicine Research 2021年第1期6卷 40-47页

作者： Xiao-qing zhou Ke-Wu Zeng State Key Laboratory of Natural and Biomimetic Drugs School of Pharmaceutical SciencesPeking UniversityBeijing 100191China

Sinomenine,a major active ingredient from traditional Chinese medicine qingfengteng(Sinomenium acutum(Thunb.)*** Wils.),has been proven to have anti-inflammatory,analgesic,anti-tumor,immunomodulatory and other pharmacological effects,and is clinically used for various inflammatory and autoimmune ***,due to complex molecular mechanisms and pathological characteristics in inflammatory and immune responses,the precise anti-inflammatory and immunological mechanisms of sinomenine are still *** review summarizes the anti-inflammatory and immunoregulatory mechanisms of sinomenine during recent years in rheumatoid arthritis,respiratory system,nervous system,digestive system and organ transplant *** molecular pharmacological mechanisms of sinomenine responsible for anti-inflammatory and immunosuppressive effects were in detail introduced based on 3 aspects including cytokines induction,signal pathways modulation and immune cells function ***,this review also raises some concerns and challenges in future sinomenine study,which will contribute to crucial theoretical and practical significance for in-depth development and utilization of sinomenine as medicinal resource.

关键词： Sinomenine Sinomenium acutum(Thunb.)Rehd.et Wils. Anti-inflammatory Immunosuppression Molecular mechanism Immunocyte

Study on Dragline-Bulldozer Operation with Variations in Coal Seam Thickness

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Journal of China University of Mining and Technology 2007年第4期17卷 464-466页

作者： zhou Wei CAI qing-xiang CHEN Shu-zhao School of Mining and Safety Engineering China University of Mining ＆Technology Xuzhou Jiangsu 221008 China

The dragline is one of the most promising surface mining machines in China. This paper studies the interac-tion between the working bench advancing speed and the stripping volume with variation in coal seam thickness. Ad-justing the bulldozing volume (depth) and/or changing the dragline bench height are proposed as means to ensure a smooth and economical mining operation. When the coal seam is getting thicker it is recommended to reduce the bull-dozing volume (depth) for a higher dragline efficiency. When the coal seam is getting thinner it is recommended to in-crease the bulldozing volume (depth) to ensure the dragline can work at the proper bench height.

关键词： open pit coal thickness variation dragline adaptability bulldozer