检索结果-南通市图书馆

维普期刊数据库

High-efficiency crystalline carbon nitride photocatalysts:Status and perspectives

在线全文

学校读者我要写书评

暂无评论

Nano Research 2024年第9期17卷 7840-7863页

作者： Wenji Pu Yunqiao Zhou Lingfeng Yang Haifeng Gong Yuhan Li Qingyu Yang Dieqing Zhang Engineering Research Center for Waste Oil Recovery Technology and Equipment Ministry of EducationChongqing Key Laboratory of Catalysis and New Environmental MaterialsChongqing Technology and Business UniversityChongqing 400067China The Education Ministry Key Lab of Resource Chemistry Joint International Research Laboratory of Resource Chemistry of Ministry of EducationShanghai Key Laboratory of Rare Earth Functional Materialsand Shanghai Frontiers Science Center of Biomimetic CatalysisShanghai Normal UniversityShanghai 200234China State Key Laboratory of Tibetan Plateau Earth System Resources and EnvironmentInstitute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China

Crystallinity and crystal structure greatly influence the photocatalytic behavior of *** g-C3N4 produced by traditional thermal-induced polycondensation reaction bears low crystallinity and thus poor photoactivity,which originates from the incomplete polymerization of the precursor containing amine groups,abundant hydrogen bonds,and unreacted amino,as well as cyanide functional groups in the *** photocatalytic process,these residual functional groups often work as electron trap sites,which may hinder the transfer of electrons on the plane,resulting in low ***,crystalline carbon nitride(CCN)was reported as a promising photocatalyst because its increased crystallinity not only reduces the number of carriers recombination centers,but also increases charge conductivity and improves light utilization due to extendedπ-conjugated systems and delocalizedπ-*** such,we summarize the recent studies on CCN-based photocatalysts for the photoactivity ***,the unique structure and properties of CCN materials are ***,the preparation methods and modification strategies are well *** also sum up the applications of CCN-based materials in the environmental purification and energy ***,this review concerning CNN materials ends with prospects and challenges in the obtainment of high crystallinity by effective techniques,and the deep understanding of photocatalytic mechanism.

关键词： crystalline carbon nitride preparation method modification strategy photocatalytic application

Expression and Function of Zinc-α2-Glycoprotein

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Neuroscience Bulletin 2019年第3期35卷 540-550页

作者： Xin Wei Xi Liu Changhong Tan Lijuan Mo Hui Wang Xi Peng Fen Deng Lifen Chen Department of Neurology The Second Affiliated Hospital of Chongqing Medical University

Zinc-α2-glycoprotein(ZAG), encoded by the AZGP1 gene, is a major histocompatibility complex I molecule and a lipid-mobilizing factor. ZAG has been demonstrated to promote lipid metabolism and glucose utilization, and to regulate insulin sensitivity. Apart from adipose tissue, skeletal muscle, liver, and kidney, ZAG also occurs in brain tissue, but its distribution in brain is debatable. Only a few studies have investigated ZAG in the brain. It has been found in the brains of patients with Krabbe disease and epilepsy, and in the cerebrospinal fluid of patients with Alzheimer disease, frontotemporal lobe dementia, and amyotrophic lateral sclerosis. Both ZAG protein and AZGP1 m RNA are decreased in epilepsy patients and animal models, while overexpression of ZAG suppresses seizure and epileptic discharges in animal models of epilepsy, but knowledge of the specific mechanism of ZAG in epilepsy is limited. In this review, we summarize the known roles and molecular mechanisms of ZAG in lipid metabolism and glucose metabolism, and in the regulation of insulin sensitivity, and discuss the possible mechanisms by which it suppresses epilepsy.

关键词： Zinc-α2-glycoprotein Metabolism Glucose Lipid Insulin sensitivity Neuron

维普期刊数据库

Phenylboronic acid-modified hollow silica nanoparticles for dual-responsive delivery of doxorubicin for targeted tumor therapy

在线全文

学校读者我要写书评

暂无评论

Regenerative Biomaterials 2017年第2期4卷 111-124页

作者： Ling Huang Qingfeng Zhang Liangliang Dai Xinkun Shen Weizhen Chen Kaiyong Cai Key Laboratory of Biorheological Science and Technology Ministry of Education College of BioengineeringChongqing UniversityChongqing 400044P.R.China

This work reports a multifunctional nanocarrier based on hollow mesoporous silica nanoparticles(HMSNs)for targeting tumor ***(DOX)was loaded into HMSNs and blocked with cytochrome C conjugated lactobionic acid(CytC–LA)via redox-cleavable disulfide bonds and pH-disassociation boronate ester bonds as intermediate *** CytC–LA was used both as sealing agent and targeting motif.A series of characterizations demonstrated the successful construction of the drug delivery *** system demonstrated pH and redox dual-responsive drug release behavior in *** DOX loading HMSNs system displayed a good biocompatibility,which could be specifically endocytosed by HepG2 cells and led to high cytotoxicity against tumor cells by inducing cell *** vivo data(tumor volume,tumor weight,terminal deoxynucleotidyl transferase dUTP nick end labeling and hematoxylin and eosin staining)proved that the system could deliver DOX to tumor site with high efficiency and inhibit tumor growth with minimal toxic side effect.

关键词： hollow mesoporous silica nanoparticles dual-response drug delivery targeted tumor therapy in vivo

Microstructure and Thermal Conductivity of As-Cast and As-Solutionized Mg–Rare Earth Binary Alloys

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 Materials Science & Technology 2017年第11期33卷 1240-1248页

作者： Liping Zhong Jian Peng Song Sun Yongjian Wang Yun Lu Fusheng Pan State Key Laboratory of Mechanical Transmission College of Materials Science and Engineering Chongqing University Chongqing 400044 China chongqing Academy of Science and Technology Chongqing 401127 China Graduate School & Faculty of Engineering Chiba University Chiba 263-8522 Japan

The microstructure and thermal conductivity of four groups of Mg–rare earth（RE） binary alloys（Mg–Ce,Mg–Nd, Mg–Y and Mg–Gd） in as-cast and as-solutionized states were systematically studied. Thermal conductivity was measured on a Netzsch LFA457 using laser flash method at room temperature. Results indicated that for as-cast alloys, the volume fraction of second phases increased with the increase of alloying elements. After solutionizing treatment, a part or most of second phases were dissolved in α-Mg matrix, except for Mg–Ce alloys. The thermal conductivity of as-cast and as-solutionized Mg–RE alloys decreased with the increase of concentrations. The thermal conductivity of as-solutionized Mg–Nd,Mg–Y and Mg–Gd alloys was lower than that of as-cast alloys. Thermal conductivity of as-solutionized Mg–Ce alloys was higher than that of as-cast alloys, because of the elimination of lattice defects and fine dispersed particles during solutionizing treatment. Different RE elements have different influences on the thermal conductivity of Mg alloys in the following order： Ce 〈 Nd 〈 Y 〈 Gd. Ce has the minimum effect on thermal conductivity of Mg alloys, because of the very low solubility of Ce in the α-Mg matrix. The variations in the atomic radius of the solute elements with Mg atom（ r）, valence, configuration of extranuclear electron of the solute atoms, and the maximum solid solubility of elements in the α-Mg matrix were suggested to be the main reasons for the differences in thermal conductivity of resulting Mg–RE alloys.

关键词： Mg alloys Rare earth elements Microstructure Thermal conductivity

维普期刊数据库

Investigation on microstructural, mechanical and electrochemical properties of aluminum composites reinforced with graphene nanoplatelets

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2015年第5期25卷 460-470页

作者： Muhammad Rashad Fusheng Pan Zhengwen Yu Muhammad Asif Han Lin Rongjian Pan College of Materials Science and Engineering Chongqing University National Engineering Research Center for Magnesium Alloys Chongqing University chongqing Academy of Science and Technology School of Materials Science and Engineering Dalian University of Technology

In present study,the microstructure,mechanical and electrochemical properties of aluminum-graphene nanoplatelets(GNPs) composites were investigated before and after *** contents of graphene nanoplatelets(GNPs) were varied from 0.25 to 1.0 wt.%in aluminum *** composites were fabricated thorough powder metallurgy method,and the experimental results revealed that Al-0.25%GNPs composite showed better mechanical properties compared with pure Al,Al-0.50%GNPs and Al-0.1.0%GNPs *** extrusion,the Al-0.25%GNPs composite showed13.5%improvement in ultimate tensile strength(UTS) and50%enhancement in failure strain over monolithic *** the other hand,Al-0.50%GNPs and Al-0.1.0%GNPs composites showed the tensile strength lower than monolithic *** significant change was observed in 0.2%yield strength(YS) of the ***,the extruded materials showed different ***0.2%YS of composites increased with increase in GNPs filler weight ***,UTS of composites with 0.25 and 0.50%GNPs was lower than monolithic *** failure strain of the baseline matrix was enhanced by46%with 0.25%graphene *** superior mechanical properties(in terms of failure strain) of the Al-0.25%GNPs composite maybe attributed to 2-D structure,high surface area and curled nature of *** addition,the corrosion resistance of pure Al and its composites reinforced with 0.5 and 1.0 wt%GNPs was also *** was found that the corrosion rate increased considerably by the presence of GNPs.

关键词： Aluminum–graphene composites Powder metallurgy Corrosion Tensile property

Constructions of ROS-responsive titanium-hydroxyapatite implant for mesenchymal stem cell recruitment in peri-implant space and bone formation in osteoporosis microenvironment

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Bioactive Materials 2022年第12期7卷 56-71页

作者： Maohua Chen Yuting Sun Yanhua Hou Zhong Luo Menghuan Li Yujia Wei Maowen Chen Lu Tan Kaiyong Cai Yan Hu Key Laboratory of Biorheological Science and Technology Ministry of EducationCollege of BioengineeringChongqing UniversityChongqing400044China School of Life Science Chongqing UniversityChongqing400044China chongqing Engineering Research Center of Pharmaceutical Science Chongqing Medical and Pharmaceutical CollegeChongqing401331China

To solve the issue of unsatisfactory recruitment of mesenchymal stem cells(MSCs)around implant in osteoporotic fractures,we fabricated a ROS-responsive system on titanium surface through hydroxyapatite coating and biomolecule *** porous hydroxyapatite and phosphorylated osteogenic growth peptides(p-OGP)were introduced onto titanium surface to synergistically improve osteogenic differentiation of *** the p-OGPpromoted expression of osteogenic related proteins,the calcium and phosphate ions were released through the degradation of hydroxyapatite and integrated into bone tissues to boost the mineralization of bone *** ROS-triggered release of DNA aptamer(Apt)19S in the osteoporotic microenvironment guides MSC migration to implant site due to its high affinity with alkaline phosphatase on the membrane of *** MSCs reached the implant interface,their osteogenic differentiation potential was enhanced by p-OGP and hydroxyapatite to promote bone *** study here provided a simple and novel strategy to prepare functional titanium implants for osteoporotic bone fracture repair.

关键词： Mesenchymal stem cell recruitment Osteogenic differentiation Hydroxyapatite Titanium Osteoporosis

Research on the influence of contact surface constraint on mechanical properties of rock-concrete composite specimens under compressive loads

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Structural and Civil Engineering 2020年第2期14卷 322-330页

作者： Baoyun ZHAO Yang LIU Dongyan LIU Wei HUANG Xiaoping WANG Guibao YU Shu LIU School of Civil Engineering and Architecture Chongqing University of Science and TechnologyChongqing 401331China The Key Laboratory of Well Stability and Fluid&Rock Mechanics in Oil and Gas Reservoir o f Shaanxi Province Xi'an Shiyou UniversityXi'an 710065China chongqing Key Laboratory of Energy Engineering Mechanics&Disaster Prevention and Mitigation Chongqing University of Science and TechnologyChongqing 401331China Graduate Office Chongqing University of Science and TechnologyChongqing 401331China

The contact form of rock-concrete has a crucial influence on the failure characteristics of the stability of rock-concrete *** study the influence of contact surface on the mechanical properties of rock-concrete composite specimens under compressive loads,the two different contact forms of rock-concrete composite specimens are designed,the mechanical properties of these two different specimens are analyzed under triaxial compressive condition,and analysis comparison on the stress-strain curves and failure forms of the two specimens is carried *** influence of contact surface constraint on the mechanical properties of rock-concrete composite specimens is *** show that the stress and strain of rock-concrete composite specimens with contact surface constraint are obviously higher than those ***,compared with composite specimens without the contact surface,the existence of contact surface constraint can increase the axial peak stress of composite specimens by 24%and the axial peak strain by 16%.According to the characteristics of the fracture surface,the theory of microcrack development is used to explain the contact surface constraint of rock-concrete composite specimens,which explains the difference of mechanical properties between the two rock-concrete composite specimens in the *** results cannot only enrich the research content of the mechanics of rock contact,but also can serve as a valuable reference for the understanding of the corresponding mechanics mechanism of other similar composite specimens.

关键词： rock-concrete composite specimen contact surface mechanical properties failure mechanism

Effects of Sn addition on microstructure and mechanical properties of Mg-Zn-Al alloys

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2017年第6期27卷 695-702页

作者： Bo Wang Xianhua Chen Fusheng Pan Jianjun Mao College of Materials Science and Engineering Chongqing University National Engineering Research Center for Magnesium Alloys Chongqing University

The effects of Sn addition（0, 0.5, 1.0, 2.0 and 3 wt%） on microstructure of Mg-4Zn-1.5Al alloy in cast and extruded states were investigated, and the mechanical properties of as-extruded Mg-4Zn-1.5Al-xSn studied. The experimental results showed that the as-cast Mg-4Zn-1.5Al alloy was composed of two phases α-Mg and Mg;（Al, Zn）;, while Sn-containing alloys consisted of α-Mg, Mg;（Al, Zn）;and Mg;Sn phases, and Mg;（Al, Zn）;was not detected after extruding due to that the most of them dissolved into the matrix during the homogenized treatment. The addition of Sn refined the grains of as-cast and as-extruded Mg-Zn-Al alloys obviously. It was noted that the basal texture intensity reduced with increasing Sn content significantly in as-extruded Mg-Zn-Al alloys. The tensile tests results indicated that Sn addition improve the tensile strength of the extruded alloys,while it had a harmful effect on the ductility. When the addition of Sn was 2 wt%, the ultimate tensile strength（UTS）, yield strength（YS） and elongation（ε;） of the alloy were 280 MPa, 147 MPa and 17.4%, respectively.

关键词： Magnesium alloys Sn addition Microstructure Texture Mechanical properties

Effect of Graphene Nanoplatelets addition on mechanical properties of pure aluminum using a semi-powder method

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2014年第2期24卷 101-108页

作者： Muhammad Rashad Fusheng Pan Aitao Tang Muhammad Asif College of Materials Science and Engineering Chongqing University National Engineering Research Center for Magnesium Alloys Chongqing University chongqing Academy of Science and Technology School of Materials Science and Engineering Dalian University of Technology

In recent years, graphene has attracted considerable research interest in all fields of science due to its unique properties. Its excellent mechanical properties lead it to be used in nano-composites for strength enhancement. This paper reports an Aluminum–Graphene Nanoplatelets(Al/GNPs)composite using a semi-powder method followed by hot extrusion. The effect of GNP nano-particle integration on tensile, compressive and hardness response of Al is investigated in this paper. It is demonstrated that 0.3 wt% Graphene Nanoplatelets distributed homogeneously in the matrix aluminum act as an effective reinforcing filler to prevent deformation. Compared to monolithic aluminum(in tension), Al–0.3 wt% GNPs composite exhibited higher 0.2% yield strength(+14.7%), ultimate tensile strength(+11.1%) and lower failure strain( -40.6%). Surprisingly, compared to monolithic Al(in compression), Al–0.3 wt% GNPs composite exhibited same 0.2% compressive yield strength and lower ultimate compression strength(- 7.8%),and lower failure strain(- 20.2%). The Al–0.3 wt% GNPs composite exhibited higher Vickers hardness compared to monolithic aluminum(+11.8%).Scanning electron microscopy(SEM), Energy-Dispersive X-ray Spectroscopy(EDS) and X-ray diffraction(XRD) were used to investigate the surface morphology, elemental percentage composition, and phase analysis, respectively.

关键词： Powder metallurgy method Mechanical properties Aluminum matrix Graphene nanoplatelets