检索结果-南通市图书馆

Permeation of dimethyl sulfoxide into articular cartilage at subzero temperatures

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2012年第3期13卷 213-220页

作者： shao-zhi ZHANG xiao-yi YU Guang-ming CHEN Institute of Refrigeration and Cryogenics Zhejiang University Hangzhou 310027 China

Osteochondral allografting has been proved to be a useful method to treat diseased or damaged areas of joint surfaces. Operational long-term stocks of grafts which supply a buffer between procurement and utilization would contribute to the commercialization or industrialization of this technology. Vitrification has been thought to be a promising method for successful preservation of articular cartilage （AC）, but high concentration cryoprotectants （CPAs） are used which may cause high cellular toxicity. An effective way to reduce CPA toxioity is to increase CPA concen- tration gradually while the temperature is lowered. Understanding the mechanism of （31~A permeation at subzero temperatures is important for designing the cryopreservation protocol. In this research, the permeation of dimethyl sulfoxide （MezSO） in ovine AC at subzero temperatures was studied experimentally. Pretreated AC discs were ex- posed in Me2SO solutions for different time （0, 5, 15, 30, 50, 80, and 120 min） at three temperature levels （-10, -20, and -30℃）. The Me2SO concentration within the tissue was determined by ultraviolet （UV） spectrophotometry. The diffusion coefficients were estimated to be 0.85×10-6, 0.48×10-8, and 0.27×10-6 cm2/s at -10, -20, and -,30℃, respectively, and the corresponding activation energy was 29.23 kJ/mol. Numerical simulation was performed to com- pare two Me2SO addition protocols, and the results demonstrated that the total loading duration could be effectively reduced with the knowledge of permeation kinetics.

关键词： Articular cartilage Vitrification Dimethyl sulfoxide Permeation Diffusion coefficient Subzero temperature

Syntheses and Evaluations of CdS with Various Morphologies for Photocatalytically Reducing CO_2

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2018年第1期33卷 78-84页

作者：杨晓晓 XIN Weiyue 尹晓红 shao xiao Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion School of Chemistry and Chemical EngineeringTianjin University of Technology School of Chemical Engineering East China University of Science and Technology

A series of CdS with various shapes of microsphere, flower-like and leaf-like were templatefreely synthesized by a hydrothermal method. Powder X-ray diffraction（XRD）, Brunauer-Emmett-Teller（BET）, scanning electron microscopy（SEM） and UV-vis absorption spectroscopy（UV-vis） were applied to characterize the morphology, optical and other physical properties of the as-prepared CdS. An optical spectrum analyzer was used to measure the wavelength of the illuminant on the slurry in the activity evaluations of photocatalytic reduction of CO2 over CdS. Both sources of cadmium and sulfur had great impact on the CdS morphology as can be seen in the SEM images. By means of a series of activity evaluations, the microspheric CdS made from cadmium nitrate and thioacetamide showed better photocatalytic activity for the reduction of CO2 to methyl formate（MF） in methanol than the flower-like and leaf-like CdS catalysts.

关键词： CdS morphology photocatalytic reduction CO2 methyl formate

Hydrothermally Synthesizing Nanospheres of Pd Loaded TiO_2 for Photocatalytically Reducing CO_2 in Isopropanol to Isopropyl Formate

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2018年第5期33卷 1046-1050页

作者： shao xiao YIN xiaohong WANG Bin YANG xiaoxiao HAN xiao Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion School of Chemistry and Chemical Engineering Tianjin University of Technology

Photocatalytic reduction of CO2 was carried out on villiform spherical catalysts of Pd-TiO2 in isopropanol *** catalysts were synthesized by hydrothermal method,their structures,morphologies and optical absorption properties were characterized by X-ray diffraction（XRD）,energy dispersive X-ray spectroscopy（EDS）,scanning electron microscopy（SEM）,transmission electron microscopy（TEM）,highresolution transmission electron microscopy（HRTEM）and UV-vis absorption spectroscopy（UV-vis）.The photocatalytic activities with different loading amounts and morphologies were evaluated for determining the dominant effect and optimizing the catalyst *** on a villiform spherical TiO2 with the largest specific surface area in our experiments,we prepared a set of catalysts with various loading amounts of palladium and tested them by bubbling CO2 through the slurry of catalyst and *** highest formation rate of isopropyl formate was 276.6μmol/g？cat/*** we proposed the reaction mechanism.

关键词： photocatalytic reduction of CO2 Pd-TiO2 isopropanol hydrothermal method isopropyl formate

Growth of Ag/g-C_(3)N_(4) nanocomposites on nickel foam to enhance photocatalytic degradation of formaldehyde under visible light

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2024年第3期137卷 432-442页

作者： Ze Wang Zhi Huang Jiang Yu xiao shao Weidong Peng Jie Yu Yinying Jiang Department of Environmental Science and Engineering College of Architecture and EnvironmentSichuan UniversityChengdu 610065China Institute of New Energy and Low Carbon Technology Sichuan UniversityChengdu 610065China School of Agriculture and Environment University of Western AustraliaPerth 6907Western AustraliaAustralia Yibin Institute of Industrial Technology Sichuan UniversityYibin 644000China

Formaldehyde is a pollutant that significantly affects the indoor air ***,conventional remediation approaches can be challenging to deal with low-concentration formaldehyde in an indoor *** this study,Photocatalysts of Ag/graphitic carbon nitride(g-C_(3)N_(4))/Ni with 3D reticulated coral structure were prepared by thermal polymerization and liquid phase photo-deposition,using nickel foam(NF)as the *** demonstrated that when the Ag concentration was 3%,and the relative humidity was 60%,the Ni/Ag/g-C_(3)N_(4)showed the maximum degradation rate of formaldehyde at 90.19%under visible light irradiation,and the formaldehyde concentration after degradation was lower than the Hygienic standard stated by the Chinese *** porous structure of Ni/Ag/g-C_(3)N_(4)and the formation of Schottky junctions promoted the Adsorption efficiency and degradation of formaldehyde,while the nickel foam carrier effectively promoted the desorption of degradation ***,the degradation rate was only reduced by3.4%after 16 recycles,the three-dimensional porous structure extended the lifetime of the *** study provides a new strategy for the degradation of indoor formaldehyde at low concentrations.

关键词： Graphitic carbon nitride(g-C_(3)N_(4)) Nickel foam(NF) Ag Formaldehyde Photocatalysis

Qualitative detection of ginsenosides in brain tissues after oral administration of high-purity ginseng total saponins by using polyclonal antibody against ginsenosides

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Natural Medicines 2018年第3期16卷 175-183页

作者： ZHAO Yu-Nan shao xiao OUYANG Liu-Feng CHEN Lin GU Ling Laboratory of Pathological Sciences College of Medicine and Life Nanjing University of Chinese Medicine Laboratory of Pathological Sciences College of Medicine Yan'an University Research Center Basic Medical College Nanjing University of Chinese Medicine

Given the limited studies and conflicting findings, the transport character of ginsenosides crossing the blood-brain barrier （BBB） remains unclear. The present study was designed to qualitatively determine the distribution of ginsenosides in brain tissues after oral administration of ginseng total saponins, using high-performance liquid chromatography-tandem mass spectrometry （HPLC-MS/MS） combined with immunohistochemistry. In brain tissue homogenates, ginsenoside Rgl was detectable and no other ginsenosides or their metabolites were found. No ginsenosides were detected in cerebrospinal fluid. Immunohistochemistry staining of brain tissue sections by using anti-ginsenoside polyclonal antibodies revealed the localization of ginsenosides in brain tissues. Furthermore, immunofluorescence double staining revealed that ginsenosides widely existed in vascular endotheliocytes and astrocytes, and in few neurons. These results indicated that Rgl was the main component that entered the brain after oral administration of ginseng total saponins and that ginsenosides could cross the BBB, although the transport capability ofginsenosides through the BBB may be poor.

关键词： Ginseng Ginsenoside Immunostaining Mass spectrometry Blood-brain barrier

Unusual hydrocarbon waxes detected in Salix oritrepha leaf from Nianbaoyeze Mountains, eastern Qinghai-Tibetan Plateau

在线全文

学校读者我要写书评

暂无评论

Journal of Mountain Science 2018年第11期15卷 2445-2452页

作者： PU Yang CAO Ji-cheng JIA Ji-hong shao xiao-hua HAN Yue School of Geographical Sciences Nanjing University of Information Science & Technology

Plant biomarkers, such as hydrocarbon waxes, are frequently found in various sediments and could be adopted as paleovegetation and paleoclimate indicators. Nevertheless, scarce researches have focused on leaf waxes in higher plants of alpine ***, hydrocarbon leaf wax components of Salix oritrepha, which flourish in Nianbaoyeze Mountains in eastern Tibetan Plateau were fully discussed. The n-alkane distribution in leaves ranges from n-C_(21) to nC_(29) with maxima at n-C_(25), which were entirely different with Salix taxa displayed in previous surveys in non-alpine regions. The unusual even carbon nalkenes from n-C_(22:1) to n-C_(30:1), which were thought to appear only in aquatic organisms, were firstly reported in an alpine plant. Additionally, iso-(2-methyl) alkanes, ranging from i-C_(23) to i-C_(29) with maxima at i-C_(25), which have been commonly reported in microorganisms, were also identified in an alpine plant for the first time. Unusual hydrocarbon distribution detected in Salix oritrepha leaf from Nianbaoyeze Mountains is most likely due to the extreme environment in such alpine region.

关键词： Leaf waxes Salix oritrepha Alpine region n-alkanes n-alkenes i-alkanes

Formula for the Probability of Secondary Electrons Passing over the Surface Barrier into a Vacuum

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2012年第11期29卷 198-201页

作者： XIE Ai-Gen xiao shao-Rong ZHAN Yu ZHAO Hao-Feng School of Physics and Optoelectronic Engineering Nanjing University of Information Science and TechnologyNanjing 210044

Based on a simple classical model that primary electrons at high electron energy interact with the electrons of lattice by the Coulomb force,we deduce the energy of secondary *** addition,the number of secondary electrons in the direction of velocity of primary electrons per unit path length,n,is *** to the energy band of the insulator,n,the definition of the probability B of secondary electrons passing over the surface barrier of insulator into the vacuum and the assumption that lattice scattering is ignored,we deduce the expression of B related to the width of the forbidden band(E_(g))and the electron affinityχ.As a whole,the B values calculated with the formula agree well with the experimental *** calculated B values lie between zero and unity and are discussed ***,we conclude that the deduced formula and the theory that explains the relationships among B,χand E_(g) are correct.

关键词： Probability deduce lattice

Feature extraction of partial discharge in low-temperature composite insulation based on VMD-MSE-IF

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

CAAI Transactions on Intelligence Technology 2022年第2期7卷 301-312页

作者： Xi Chen xiao shao Xin Pan Gaochao Luo Maoqiang Bi Tianyan Jiang Kang Wei School of Electrical and Electronic Engineering Chongqing University of TechnologyChongqingChina Chongqing Wanzhou District Municipal Facilities Maintenance and Management Center ChongqingChina Meta Platforms Inc Menlo ParkCaliforniaUSA

Low-temperature composite insulation is commonly applied in high-temperature super-conducting apparatus while partial discharge(PD)is found to be an important indicator to reveal insulation *** order to extract feature parameters of PD signals more effectively,a method combined variational mode decomposition with multi-scale entropy and image feature is *** on the simulated test platform,original and noisy signals of three typical PD defects were obtained and ***,relative moments and grayscale co-occurrence matrix were employed for feature extraction by K-modal component ***,new PD feature vectors were obtained by dimension ***,effectiveness of different feature extraction methods was evaluated by pattern recognition based on support vector machine and K-nearest *** shows that the proposed feature extraction method has a higher recognition rate by comparison and is robust in processing noisy signals.

关键词： feature extraction pattern recognition

Knowledge,attitude,and practice of patients living with inflammatory bowel disease:A cross-sectional study

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2023年第43期29卷 5818-5833页

作者： xiao-xiao shao Lu-Yan Fang Xu-Ri Guo Wei-Zhong Wang Rui-Xin Shi Dao-Po Lin Department of Gastroenterology The Second Affiliated Hospital and Yuying Children’s Hospital of Wenzhou Medical UniversityWenzhou 325027Zhejiang ProvinceChina The Second Clinical Medical College Wenzhou Medical UniversityWenzhou 325035Zhejiang ProvinceChina

BACKGROUND Patients with inflammatory bowel diseases(IBDs)generally have poor knowledge,attitude,and practice of their disease,while the data from China are *** To address this knowledge disparity among Chinese patients with *** This web-based,cross-sectional study was conducted on a cohort of IBD patients who visited the Second Affiliated Hospital of Wenzhou Medical University between December 2022 and February *** socio-demographic information and the knowledge,attitude,and practice scores were collected and estimated using a self-designed ***’s correlation analysis was used to determine the pairwise correlations among knowledge,attitude,and practice scores.A multivariate logistic regression analysis was further performed to determine the independent factors associated with their knowledge,attitude,and practice *** A total of 353 patients(224 males)with IBD completed the *** mean knowledge,attitude,and practice scores were 10.05±3.46(possible range:0-14),41.58±5.23(possible range:0-56),44.20±7.39(possible range:0-56),respectively,indicating good knowledge,positive attitude,and proactive practice toward ***’s correlation analysis showed that the knowledge score had significant positive correlations with the attitude score(r=0.371,P<0.001)and practice score(r=0.100,P<0.001).The attitude score had a significant positive correlation with the practice score(r=0.452,P<0.001).Moreover,multivariate logistic regression analysis showed that aged 30-40 years[odds ratio(OR)=4.06,95%confidence interval(CI):1.04-15.82,P=0.043],middle school education(OR=3.98,95%CI:1.29-12.33,P=0.017),high school/technical secondary school education(OR=14.06,95%CI:3.92-50.38,P<0.001),and junior college/bachelor’s degree and above education(OR=15.20,95%CI:4.15-55.650,P<0.001)were independently associated with good *** higher knowledge score was independently associated with a positive attitude(OR=1.23,95%CI:1.11-

关键词： Attitude Cross-sectional study Inflammatory bowel disease Knowledge Practice Questionnaire