检索结果-南通市图书馆

Asian Pacific Journal of Tropical Biomedicine 2020年第5期10卷 224-231页

作者： Zheng-wen Wang Hao Liu Geng-Tai Ye Zhi-yong Sheng Yan-feng Hu Yin-feng Tan Guo-Xin Li Department of General Surgery Nanfang HospitalSouthern Medical UniversityGuangzhou 510515GuangdongChina Department of Hepatopancreatobiliary Surgery and General Surgery Hainan Cancer HospitalAffiliated Cancer Hospital of Hainan Medical UniversityHaikou 570312HainanChina Hainan Provincial Key Laboratory of R&D on Tropical Herbs Hainan Medical UniversityHaikou 571199HainanChina

Objective: To investigate the cytotoxic effects and the potential mechanisms of crebanine N-oxide in SGC-7901 gastric adenocarcinoma cells. Methods: The cytotoxicity of crebanine N-oxide was evaluated by 3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2-H-tetrazolium bromide assay and cellular morphology was observed under a microscope. Cell apoptosis was determined by flow cytometry using propidium iodide staining. The expression levels of apoptotic-related proteins, cleaved caspase-3, cytochrome C, p53 and Bax, and autophagyrelated proteins p62, beclin1 and LC3 were detected by Western blotting assays. Results: Crebanine N-oxide treatment significantly inhibited the proliferation of SGC-7901 cells in a dose-dependent and timedependent manner via induction of G2-phase cell cycle arrest, apoptosis, and autophagy in SGC-7901 ***: Crebanine N-oxide could inhibit the growth of gastric cancer cells by promoting apoptosis and autophagy and could be used as a potential agent for treating gastric cancer.

关键词： Crebanine N-oxide Gastric cancer SGC-7901 cells Apoptosis Autophagy

Efficient Monolithic Perovskite/Silicon Tandem Photovoltaics

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Energy & Environmental Materials 2024年第3期7卷 268-281页

作者： yong Wang Yu Wang feng Gao Deren Yang State Key Laboratory of Silicon Materials and School of Materials Science and Engineering Zhejiang UniversityHangzhou 310027China ZJU-Hangzhou Global Scientific and Technological Innovation Center Zhejiang UniversityHangzhou 310014China Department of Physics Chemistry and Biology(IFM)Linköping UniversityLinköping 58183Sweden

Tunable bandgaps make halide perovskites promising candidates for developing tandem solar cells(TSCs),a strategy to break the radiative limit of 33.7%for single-junction solar *** perovskites with market-dominant crystalline silicon(c-Si)is particularly attractive;simple estimates based on the bandgap matching indicate that the efficiency limit in such tandem device is as high as 46%.However,state-of-the-art perovskite/c-Si TSCs only achieve an efficiency of~32.5%,implying significant challenges and also rich *** this review,we start with the operating mechanism and efficiency limit of TSCs,followed by systematical discussions on wide-bandgap perovskite front cells,interface selective contacts,and electrical interconnection layer,as well as photon management for highly efficient perovskite/c-Si *** highlight the challenges in this field and provide our understanding of future research directions toward highly efficient and stable large-scale wide-bandgap perovskite front cells for the commercialization of perovskite/c-Si TSCs.

关键词： 2-terminal electrical interconnection perovskite/silicon tandem photovoltaics photon management wide-bandgap perovskites

Metal hydride work pair development and its application on automobile air conditioning systems

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第2期8卷 197-204页

作者： QIN feng CHEN Jiang-ping ZHANG wen-feng CHEN Zhi-jiu Institute of Refrigeration and Cryogenic Engineering Shanghai Jiao Tong University Shanghai 200030 China Research Center Zhejiang Yinlun Machinery Co. Ltd. Tiantai 317200 China

Aiming at developing exhaust gas driving automobile air conditioning systems, a hydride pair LaNi4.61Mn0.26A10.13/ La0.6Y0.4Ni4.8Mn0.2 was developed working at 393-473 K/293-323 K/263-273 K. Property tests showed that both alloys have flat plateau slopes and small hystereses; system theoretical coefficient of performance （COP） is 0.711. Based on this work pair, a function proving automobile metal hydride refrigeration system was constructed. The equivalent thermal conductivities of the activated reaction beds were merely 1.1-1.6 W/（m-K）, which had not met practical requirement. Intermittent refrigeration cycles were achieved and the average cooling power was 84.6 W at 423 K/303 K/273 K with COP being 0.26. By altering cycling parameters, experiment data showed that cooling power and system COP increase with the growth of heat source temperature as well as pre-heating and regeneration time while decrease with heat sink temperature increment. This study confirms the feasibility of automobile metal hydride refrigeration systems, while heat transfer properties of reaction beds still need to be improved for better performance.

关键词： Metal hydride Air conditioning Reaction bed Automobile Coefficient of performance (COP)

Synthesis,pharmacokinetics and in vivo antifungal activity of the novel water-soluble prodrugs of itraconazole analogue YL-24

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2013年第4期24卷 321-324页

作者： Yu Liu Xu-feng Cao Xin Liu yong-Bing Cao wen-Jing Chu Yu-She Yang State Key Laboratory of Drug Research Shanghai Institute of Materia MedicaChinese Academy of Sciences School of Pharmacy Second Military Medical University State Key Laboratory of Drug Research Shanghai Institute of Materia MedicoChinese Academy of Sciences

To improve the aqueous solubility of an itraconazole analogue, compound 1 （YL-24）, a series of novel prodrugs were synthesized. Among these prodrugs, the phosphate disodium salt compound 7 exhibited excellent aqueous solubility （9.8 mg/mL） at near-neutral pH and sufficient stability in buffer solutions, along with favorable pharmacokinetic profiles. In particular, compounds 1 and 7 provided moderate survival efficacy in murine systemic Candida albicans SC5314 infection model, but their efficacy was weaker than that of fluconazole.

关键词： SynthesisAntifungalWater-soluble prodrugsltraconazole analogue

Enhanced sulfidization of azurite surfaces by ammonium phosphate and its effect on flotation

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2022年第6期29卷 1150-1160页

作者： Qian Zhang Shuming wen Qicheng feng Han Wang State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization Faculty of Land Resource EngineeringKunming University of Science and TechnologyKunming 650093China

Although azurite is one of the most important copper oxide minerals,the recovery of this mineral via sulfidization-xanthate flotation is typically *** present work demonstrated the enhanced sulfidization of azurite surfaces using ammonia phosphate((NH_(4))_(3)PO_(4)) together with Na_(2)S,based on micro-flotation experiments,time-of-flight secondary ion mass spectrometry(ToF-SIMS),X-ray photoelectron spectroscopy(XPS),zeta-potential measurements,contact angle measurements,Fourier-transform infrared(FT-IR)spectroscopy,and ultraviolet-visible(UV-Vis)***-flotation experiments showed that the floatability of azurite was increased following the simultaneous addition of(NH_(4))_(3)PO_(4)and Na_(2)***-SIMS and XPS analyses demonstrated the formation of a high content of S species on the azurite surface and an increase in the number of Cu(I)species after exposure to(NH_(4))_(3)PO_(4)and Na_(2)S,compared with the azurite-Na_(2)S *** zeta potential of azurite particles was negatively shifted and the contact angle on the azurite surface was increased with the addition of(NH_(4))_(3)PO_(4)prior to Na_(2)*** results indicate that treatment with(NH_(4))_(3)PO_(4) enhances the sulfidization of azurite surfaces,which in turn promotes xanthate ***-IR and UV-Vis analyses confirmed that the addition of(NH_(4))_(3)PO_(4) increased the adsorption of xanthate with reducing the consumption of xanthate during the azurite flotation ***,(NH_(4))_(3)PO_(4) has a beneficial effect on the sulfidization flotation of azurite.

关键词： azurite ammonium phosphate enhanced sulfidization reagent adsorption flotation enhancement

Structural Design and Application of Azo-based Supramolecular Polymer Systems

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2019年第12期37卷 1183-1199,I0004页

作者： Hui-Tao Yua Jun-wen Tang Yi-Yu feng Wei feng School of Materials Science and Engineering Tianjin UniversityTianjin 300072China Key Laboratory of Advanced Ceramics and Machining Technology Ministry of EducationTianjin 300072China Tianjin Key Laboratory of Composite and Functional Materials Tianjin 300072China Collaborative Innovation Center of Chemical Science and Engineering Tianjin 300072China

This article presents a brief overview of recent advances in azo-containing supramolecular *** literature,it has been shown that azo supramolecular polymers and their composite materials exhibit fast and intelligent responses to various external stimuli,such as temperature,pH change,redox reagents,ligands,coupling reagents,*** applications,these systems are widely used for molecular motors,shape memory,liquid crystal,solar thermal energy storage,signal transmission,intelligent encryption,and other ***,these systems can function as key components for device upgrade ***,the design and rules of azo supramolecular polymers are still not supported by an exact *** about the relationship between the spatial structure and behavior is lacking,and new supramolecular materials cannot be designed by adding functional moieties to known azo *** on the current research status,this review mainly summarizes the structural design principles as well as structures and applications of known azo supramolecules;meanwhile,it highlights the emerging development fields,recent advances,and prospects in fabricating sei住assembling intelligent supramolecular systems with azo supramolecular polymers as responsive *** goal of this review is to bring new inspiration to researchers who want to optimize the chemical structure,steric conformation,electrostatic environment,and specific molecular functionalization.

关键词： Azo Supramolecular Structures Application Prospect

Atomic layer deposition of TiO_(2) on carbon-nanotubes membrane for capacitive deionization removal of chromium from water

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2022年第5期35卷 15-21页

作者： Jianhua feng Sen Xiong Li Ren yong Wang College of Material and Chemical Engineering Chuzhou UniversityChuzhou 239000China State Key Laboratory of Materials-Oriented Chemical Engineering and College of Chemical EngineeringNanjing Tech UniversityNanjing 211816China

Chromium(Cr)is a common heavy metal that has severe impacts on the ecosystem and human *** deionization(CDI)is an environment-friendly and energy-efficient electrochemical purification technology to remove Cr from polluted *** performance of CDI systems relies primarily on the properties of ***-nanotubes(CNTs)membranes are promising candidates in creating advanced CDI electrodes and ***,the low electrosorption capacity and high hydrophobicity of CNTs greatly impede their applications in water *** this study,we employ atomic layer deposition(ALD)to deposit TiO_(2) nanoparticulates on CNTs membranes for preparing electrodes with *** TiO_(2)-deposited CNTs membranes display preferable electrosorption performance and reusability in CDI processes after only 20 ALD cycles *** total Cr and Cr(VI)removal efficiencies are significantly improved to 92.1%and 93.3%,*** work demonstrates that ALD is a highly controllable and simple method to produce advanced CDI electrodes,and broadens the application of metal oxide/carbon composites in the electrochemical processes.

关键词： Carbon-nanotube membranes Atomic layer deposition Capacitive deionization Chromium removal

Thermodynamic analysis and kinetic optimization of high-energy batteries based on multi-electron reactions

在线全文

学校读者我要写书评

暂无评论

National Science Review 2020年第8期7卷 1367-1386页

作者： yong-Xin Huang feng Wu Ren-Jie Chen Beijing Key Laboratory of Environmental Science and Engineering School of Materials Science and Engineering Beijing Institute of Technology Advanced Technology Research Institute (Jinan) Beijing Institute of Technology Collaborative Innovation Center of Electric Vehicles in Beijing

Multi-electron reaction can be regarded as an effective way of building high-energy systems(>500 W h kg-1). However, some confusions hinder the development of multi-electron mechanisms, such as clear concept, complex reaction, material design and electrolyte optimization and full-cell ***, this review discusses the basic theories and application bottlenecks of multi-electron mechanisms from the view of thermodynamic and dynamic principles. In future, high-energy batteries,metal anodes and multi-electron cathodes are promising electrode materials with high theoretical capacity and high output voltage. While the primary issue for the multi-electron transfer process is sluggish kinetics,which may be caused by multiple ionic migration, large ionic radius, high reaction energy barrier, low electron conductivity, poor structural stability, etc., it is urgent that feasible and versatile modification methods are summarized and new inspiration proposed in order to break through kinetic ***, the remaining challenges and future research directions are revealed in detail, involving the search for high-energy systems, compatibility of full cells, cost control, etc.

关键词： multi-electron reactions thermodynamic kinetics high-energy density metal anodes

Arsenite oxidation by three types of manganese oxides

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2006年第2期18卷 292-298页

作者： feng Xiong-han ZU Yan-qun TAN wen-feng LIU Fan College of Resources and Environment Huazhong Agricultural University Wuhan 430070 China College of Resources and Environment Yunnan Agricultural University Kunming 650201 China

Oxidation of As（Ⅲ） by three types of manganese oxides and the effects ofpH, ion strength and tartaric acid on the oxidation were investigated by means of chemical analysis, equilibrium redox, X-ray diffraction （XRD） and transmission electron microscopy （TEM）. Three synthesized Mn oxide minerals, bimessite, cryptomelane, and hausmannite, which widely occur in soil and sediments, could actively oxidize As（Ⅲ） to As（Ⅴ）. However, their ability in As（Ⅲ）-oxidation varied greatly depending on their structure, composition and surface properties. Tunnel structured cryptomelane exhibited the highest ability of As （Ⅲ） oxidation, followed by the layer structured birnessite and the lower oxide hausmannite. The maximum amount of As （Ⅴ） produced by the oxidation was in the order （mmol/kg） of cryptomelane （824.2）〉 bimessite （480.4）〉 hausmannite （117.9）, As pH increased from the very low value（pH 2.5）, the amount of As（Ⅲ） oxidized by the tested Mn oxides was firstly decreased, then negatively peaked in pH 3.0 6.5, and eventually increased remarkably. Oxidation of As（Ⅲ） by the Mn oxides had a buffering effects on the pH variation in the solution. It is proposed that the oxidative reaction processes between As （Ⅲ） and biruessite（or cryptomelane） are as follows：（1） at lower pH condition：（MnO2）x＋ H3AsO3 ＋ 0.5H^＋=0.5H2AsO4^- ＋ 0.5HAsO4^2- ＋Mn〉^2＋（MnO2）x-1 ＋ H2O; （2） at higher pH condition：（MnO2）x ＋ H3AsO3 = 0.5H2AsO4^- ＋ 0.5HAsO4^2- ＋ 1.5H^＋＋（MnO2）x-1. MnO. With increase of ion strength, the As（Ⅲ） oxidized by bimessite and cryptomelane decreased and was negatively correlated with ion strength. However, ion strength had little influence on As （Ⅲ） oxidation by the hausmarmite. The presence of tartaric acid promoted oxidation of As（Ⅲ） by birnessite. As for cryptomelane and hansmannite, the same effect was observed when the concentration of tartaric acid was below 4 mmol/L, otherwise the oxidized As（Ⅲ） decreased. These findings are of great significance in improving our understanding

关键词： oxidation of As(Ⅲ) As(Ⅴ) Mn oxides pH ion strength tartaric acid

Strengthening mechanisms of reduced activation ferritic/martensitic steels:A review

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2021年第3期28卷 335-348页

作者： Jin-hua Zhou yong-feng Shen Nan Jia Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) School of Materials Science and EngineeringNortheastern UniversityShenyang 110819China The State Key Lab of Rolling&Automation Northeastern UniversityShenyang 110819China

This review summarizes the strengthening mechanisms of reduced activation ferritic/martensitic(RAFM)***-angle grain boundaries,subgrain boundaries,nano-sized M_(23)C_(6),and MX carbide precipitates effectively hinder dislocation motion and increase high-temperature strength.M23C6 carbides are easily coarsened under high temperatures,thereby weakening their ability to block *** properties are improved through the reduction of M23C6 ***,the loss of strength must be compensated by other strengthening *** review also outlines the recent progress in the development of RAFM *** dispersion-strengthened steels prevent M23C6 precipitation by reducing C content to increase creep life and introduce a high density of nano-sized oxide precipitates to offset the reduced *** plastic deformation methods can substantially refine subgrains and MX carbides in the *** thermal deformation strengthening of RAFM steels mainly relies on thermo-mechanical treatment to increase the MX carbide and subgrain *** procedure increases the creep life of TMT(thermo-mechanical treatment)9Cr-1W-0.06Ta steel by~20 times compared with those of F82H and Eurofer 97 steels under 550℃/260 MPa.

关键词： reduced activation ferritic/martensitic steel strengthening mechanism high-angle grain boundary subgrain boundary precipitate