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Preparation of carbon nanotube/epoxy composite films with high tensile strength and electrical conductivity by impregnation under pressure

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Frontiers of Materials Science 2019年第2期13卷 165-173页

作者： Heng CHEN Yun CHEN Hang ZHAN Guang WU jian ming xu jian Nong WANG School of Mechanical and Power Engineering East China University of Science and Technology 130 Meilong Road Shanghai 200237 China Shanghai Institute of Space Power Sources 2965 Dongchuan Road Shanghai 200245 China

Based on the production of a carbon nanotube (CNT) assembly, a new technique is developed for preparing CNT/epoxy (EP) composite films with high tensile strength and electrical conductivity. CNTs are synthesized by floating catalyst spray pyrolysis. After self-assembling into a hollow cylindrical assembly, CNTs are drawn and wound on a rotating drum to form a uniform CNT film. EP resin solutions of different concentrations are used to fill into the pores within the film under different pressures and form composite films after hot-press curing. The permeability of the EP resin and thus the interfacial bonding between the CNT and the EP resin are studied by varying the concentration of the EP resin solution and the pressure used for impregnation. Under optimal preparation conditions, the composite film contains CNTs of a high content of 59 wt.%, and shows a high tensile strength of 1.4 GPa and a high electrical conductivity of 1.4x10^5 S·m^-1, 159% and 309% higher than those of the neat CNT film, respectively.

关键词： carbon nanotube alignment resin matrix composite tensile strength impregnation under pressure

Magnetostratigraphy and ^(230)Th dating of a drill core from the southeastern Qaidam Basin:Salt lake evolution and tectonic implications

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Geoscience Frontiers 2018年第3期9卷 943-953页

作者： An-Dong Chen Mian-Ping Zheng Hai-Tao Yao Kui Su jian-ming xu MLR Key Laboratory of Saline Lake Resources and Environments Institute of Mineral ResourcesChinese Academy of Geological Sciences Institute of Geomechanics Chinese Academy of Geological Sciences

The Qarhan Salt Lake area is the Quaternary depocenter of the Qaidam Basin, and carries thick lacustrine sediments, as well as rich potassium and magnesium salt deposits. The abundant resources and thick sediments in this lake provide an ideal place for the study of biogas formation and preservation, salt lake evolution, and the uplift of the Tibetan Plateau. In this study, we attempt to construct a paleomagnetic and ^(230)Th age model and to obtain information on tectonic activity and salt lake evolution through detailed studies on a 1300-m-long drill core(15DZK01) from the northwestern margin of the Qarhan Salt Lake area(Dongling Lake). Based on gypsum ^(230)Th dating, the age of the uppermost clastic deposit was calculated to be around 0.052 Ma. The polarity sequence consist of 13 pairs of normal and reversed zones,which can be correlated with subchrons C2r.1r-C1n of the geomagnetic polarity timescale(GPTS 2012)(from ~2.070 Ma to ~0.052 Ma). Sedimentary characteristics indicate that Dongling Lake witnessed freshwater environment between ~ 2.070 Ma and 1.546 Ma. During this period, the sedimentary record reflects primarily lakeshore, shallow-water and swamp environments, representing favourable conditions for the formation of hydrocarbon source rocks. Between 1.546 Ma and ~ 0.052 Ma, the Dongling Lake was in sulphate deposition stage, which contrasts with the central Qarhan Salt Lake area, where this stage did not occur in the meantime. During this stage, Dongling Lake was in a shallow saltwater lake environment, but several periods of reduced salinity occurred during this stage. During the late Pleistocene at ~0.052 Ma, the Dongling Lake experienced uplift due to tectonic activity, and saltwater migrated through the Sanhu Fault to the central Qarhan Salt Lake area, resulting in the absence of halite deposition stage. The residual saline water was concentrated into magnesium-rich brine due to the lack of freshwater, and few potassium salt deposits occur in the Don

关键词： Qaidam Basin Magnetostratigraphy 230Th dating Salt lake evolution Tectonic activity

PREPARATION OF MDPE-g-MAH COPOLYMERS AND THEIR EFFECT ON PROPERTIES OF MDPE/CaCO_3 SYSTEMS

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Chinese Journal of Polymer Science 2013年第9期31卷 1271-1275页

作者： Guo-dong Zhao Xiao-bo Liu Guang-nan Qiu jian-ming xu Shi-ping Xie Xian-feng Liu jian-song Yang Lan-hang xu Changyuan Electronics Co. Ltd. Changyuan Group Co. Ltd.

MDPE-g-MAH copolymers were prepared with MDPE （medium density polyethylene） and MAH （maleic anhydride） under different irradiation doses of high-energy electron accelerator, and FTIR spectra confirmed their structure. The effect of the different contents of MDPE-g-MAH copolymers on properties of MDPE/CaCO3 system is studied intensively. By adding 4 Phr （parts per hundred of resin） MDPE-g-MAH in MDPE/CaCO3 system under irradiation dose of 0.7 MGy, the tensile strength increases from 16.3 MPa to 19.9 MPa, and elongation at break increases from 437% to 518%. SEM images show the domain size of CaCO3 in MDPE-g-MAH systems becomes small. Definitely, MDPE-g-MAH copolymer could improve the compatibility of MDPE/CaCO3 system effectively.

关键词： MDPE-g-MAH copolymer MDPE CaCO3, Irradiation modification Compatibility.

Association of MYO9B gene polymorphisms with inflammatory bowel disease in Chinese Han population

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World Journal of Gastroenterology 2014年第23期20卷 7466-7472页

作者： Jing Hu Qiao Mei jian Huang Nai-Zhong Hu Xiao-Chang Liu jian-ming xu Department of Gastroenterology the First Affiliated Hospital of Anhui Medical UniversityKey Laboratory of Gastroenterology of Anhui Province

AIM: To explore the association of MYO9B gene polymorphisms with clinical phenotypes and intestinal permeability of individuals with inflammatory bowel disease (IBD) in China.

关键词： Inflammatory bowel disease Crohn’ s disease Ulcerative colitis MYO9B Genetic susceptibility Intestinal permeability

Melatonin Ameliorates Liver Fibrosis Induced by Carbon Tetrachloride in Rats via Inhibiting TGF-β1/Smad Signaling Pathway

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Current Medical Science 2018年第2期38卷 236-244页

作者： Yu-rong WANG Ru-tao HONG Yuan-yuan XIE jian-ming xu Department of Gastroenterology First Affiliated Hospital of Anhui Medical University Key Laboratory of DigestiveDisease of Anhui Province Hefei 230022 China

Melatonin has been reported to inhibit hepatic fibrosis and the mechanism may be correlated to its anti-oxidant effect. Nevertheless, the mechanism is not completely identified. This study was conducted to investigate the effects of melatonin on TGF-β1/Smad signaling pathway in liver fibrosis in rats. The liver fibrosis model was made by the subcutaneous injection of CC14. The liver pathology changes were detected using hematoxylin and eosin （H＆E） staining and Van Gieson （VG） staining. Serum alanine aminotransferase （ALT） and aspartate aminotransferase （AST） activities were measured with an autoanalyzer. Glutathione peroxidase （GPx） activities and levels of malondialdehyde （MDA） and hydroxyproline （Hyp） in liver were evaluated by spectrophotometry. Expression levels of TGF-β1, Smad2/3, phosphorylated Smad2/3 （p-Smad2/3） and Smad7 in liver were detected by immunohistochemistry and Western blot analysis. Results showed that melatonin suppressed CC14-induced liver fibrosis, along with an improvement in histological changes, significant decreases in pathologic grading sores and obvious decreases in Hyp levels in liver. Melatonin improved liver function indicated by decreased serum ALT and AST activities. In addition, melatonin exerted its anti-oxidant effects, as supported by decreased MDA levels and increased GPx activities in liver. Furthermore, melatonin inhibited TGF-β1/Smad pathway, as evidenced by decreased TGF-β1, Smad2/3 and p-Smad2/3 expression and increased Smad7 expression in liver. In conclusion, melatonin may suppress CCl4-induced hepatic fibrosis in rats via inhibiting TGF-β1/Smad pathway. It is possible for melatonin to be a potential reagent to treat and cure liver fibrosis.

关键词： melatonin liver fibrosis TGF-β1 Smad

Comparison of pharmacokinetics,efficacy and toxicity profile of gemcitabine using two different administration regimens in Chinese patients with non-small-cell lung cancer

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2007年第5期8卷 307-313页

作者： WANG Lin-run LIU jian HUANG ming-zhu xu Nong Department of Clinical Pharmacy the First Affiliated Hospital School of Medicine Zhejiang University Hangzhou 310003 China

Objective： To conduct a randomized comparative trial of pharmacokinetics, efficacy and toxicity profile treatment with 1200 mg/m^2 gemcitabine using standard 30-min infusion or fixed dose rate （FDR） infusion [10 mg/（m^2-min）] on days 1 and 8 plus carboplatin AUC （area under curve） 5 on day 1 in Chinese non-small-cell cancer patients. Twelve patients were enrolled in this study. Methods： Plasma gemcitabine concentrations were measured by ion-pair reversed phase high performance liquid chromatography. Antitumoral activity and toxicity of gemcitabine was assessed according to World Health Organization criteria. Results： The obtained mean parameters, such as T1/2 （elimination half time）, AUC, and CL （clearance）, were consistent with those reported in literature. Qualified response rate in our study was 33.3% for standard arm and 50% for FDR ann. Additional 50% and 33.3% patients contracted stable disease （SD） in standard arm and FDR arm, respectively. The predominant toxicity was hematologic, and patients in the standard infusion ann experienced consistently more hematologic toxicity, Conclusion： Pharmacokinetic and clinical data in this trial support the continued evaluation of the FDR infusion strategy with gemcitabine.

关键词： Gemcitabine Non-small-cell lung cancer Pharmacokinetics Qualified response Safety

Total Synthesis of Naloxone

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有机化学 2003年第Z1期23卷 139-140页

作者： HU Wen-Xiang WANG jian-Ying xu ming Institute of Military Medicine Headquarters of General Equipment Beijing 100101 Institute of Military Medicine Headquarters of General Equipment Beijing 100101 Institute of Military Medicine Headquarters of General Equipment Beijing 100101

　　Naloxone (1) is one of the 14-hydroxyl substituted opium antagonists which are valuable medications for treat ment of opiate abuse, opiate overdose, and alcohol addiction. Here, the total synthesis of naloxone was... 详细信息

关键词： total synthesis

Corrosion behavior of Al-3.0 wt%Mg alloy in NaCl solution under magnetic field

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Rare Metals 2017年第8期36卷 627-634页

作者： Xin Zhang Ze-Hua Wang Ze-Hua Zhou jian-ming xu Zhao-Jun Zhong Huan-Long Yuan College of Mechanics and Materials Hohai UniversityNanjing 210098China Zhangjiagang Hongji Aluminum Co.Ltd. Suzhou 215600China

The influences of applied magnetic field on the corrosion behavior of Al-3.0 wt%Mg alloy in 3.5 wt% NaCl solution were investigated by electrochemical measurements,scanning electron microscopy（SEM）and energy-dispersive spectroscopy（EDS）.Stochastic analysis was applied to investigate the influences of applied magnetic *** results indicate that the application of horizontal magnetic field of 0.4 T would increase the pitting corrosion potential（E_（pit））,decrease the corrosion current density（i_（corr））,prolong the pit initiation time,slow down the pit generation rate and inhibit the growth of pitting of the tested alloys in 3.5 wt% NaCl *** applied magnetic field would also change the mechanism of pit initiation of Al-3.0 wt%Mg alloy from A_3 model（without magnetic field）to A_3＋A_4 model（with magnetic field）.The intermediate product Al_（（ad））~＋ is the paramagnetic ion that would be influenced by magnetic field sensitively.

关键词： Al-3.0 wt%Mg alloy Applied magnetic field Pitting corrosion Paramagnetic ion

DNA fragmentation in apoptosis

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Cell Research 2000年第3期10卷 205-211页

作者： ZHANG jian HUA, ming xu (Department of Cell Biology, Neurobiology and Anatomy, University of Cincinnati College of Medicine, Cincinnati, Ohio 452670521, USA) DepartmentofCellBiology NeurobiologyandAnatomyUniversityofCincinnatiCollegeofMedicineOhio45267-0521USA.

Cleavage of chromosomal DNA into oligonucleosomal size fragments is an integral part of apoptosis. Elegant biochemical work identified the DNA fragmentation factor (DFF) as a major apoptotic endonuclease for DNA fragmentation in vitro. Genetic studies in mice support the importance of DFF in DNA fragmentation and possibly in apoptosis in vivo. Recent work also suggests the existence of additional endonucleases for DNA degradation. Understanding the roles of individual endonucleases in apoptosis, and how they might coordinate to degrade DNA in different tissues during normal development and homeostasis, as well as in various diseased states, will be a major research focus in the near future.

关键词： DNA fragmentation DFF endonucleases apop tosts.