检索结果-南通市图书馆

Journal of Iron and Steel Research International 2024年第4期31卷 924-932页

作者： Wei Liu Yan Wang Li-xiong Han Ying-kang Wei Hui-p.ng Tang shi-feng Liu School of Metallurgical Engineering Xi'an University of Architecture and TechnologyXi'an 710055ShaanxiChina School of Engineering Zhejiang University City CollegeHangzhou 310015ZhejiangChina

The oxygen content of metal powder is decisive for the recyclability of *** research on the effect of oxygen content on powder properties and material formability has practical significance for economical production with additive manufacturing while preventing the waste of ***,we deliberately oxidized the powder by baking at high temperature to increase the oxygen content in the powder and gave the calculation method of the oxygen content in the powder oxidation *** majority of oxygen element was found in the oxide particles in the powder and the oxide flm on the powder surface,which did affect the flowability of the *** is worth noting that the increase in the oxygen content does not change the phase of H13 steel,but it can promote the molten pool flow and obtain a smoother *** increase in the oxygen content in the powder is not the decisive factor for the formability and defects of the printed *** is the combined effect of the powder deformation,the increase in the oxygen content,and the impurity pollution after repeated use,which leads to the limitation of repeated utilization of the powder.

关键词： Additive manufacturing Electron beam melting H13 steel powder-powder oxidation

Structural superlubricity at homogenous interface of p.ntagraphene

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Friction 2024年第9期12卷 2004-2017页

作者： Xinqi ZHAnG Jiayi FAn Zichun CUI Tengfei CAO Junqin shi feng ZHOU Weimin LIU Xiaoli FAn State Key Laboratory of Solidification processing Center for Advanced Lubrication and Seal MaterialsSchool of Material Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China School of Material Science and Engineering Northwestern Polytechnical UniversityXi’an 710072China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China

Two-dimensional(2D)van der Waals layered materials have been widely used as ***-graphene(pG),a 2D carbon allotrope exclusively composed of irregular carbon p.ntagons has recently been predicted to have superlubricating *** the present study,by combining the molecular dynamics simulation and first-principles calculations,we investigated the frictional property of pG in both commensurate and incommensurate *** calculations show the ultra-low friction at the interface of relatively rotated bilayer pG with twist angles of more than 10°away from the commensurate ***,our calculations demonstrate the isotropy of the ultra-low friction at the interface of incommensurate contact,in contrast to the anisotropic of the commensurate contacting ***,the evolution of friction force and the fluctuation of potential energy along sliding path correlate closely with the interface’s *** energetics and charge density explain the difference between the friction at the interfaces of the commensurate and incommensurate *** only that,we found the correlation between the intrinsic structural feature and interlayer binding ***,our findings on the retainment of the ultra-low friction under work conditions indicates that the superlubricating state of pG has good practical adaptability.

关键词： structural superlubricity p.nta-graphene molecular dynamics incommensurate contact

Dietary fat supplementation relieves cold temperature-induced energy stress through AMpK-mediated mitochondrial homeostasis in pigs

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 Animal Science and Biotechnology 2024年第4期15卷 1669-1687页

作者： Wei He Xinyu Liu Ye feng Hongwei Ding Haoyang Sun Zhongyu Li Baoming shi College of Animal Science and Technology Northeast Agricultural University600 Changjiang StreetHarbin 150030PR China

Background Cold stress has negative effects on the growth and health of mammals, and has become a factor restricting livestock development at high latitudes and on plateaus. The gut-liver axis is central to energy metabolism, and the mechanisms by which it regulates host energy metabolism at cold temperatures have rarely been illustrated. In this study, we evaluated the status of glycolipid metabolism and oxidative stress in pigs based on the gut-liver axis and propose that AMp-activated protein kinase(AMpK) is a key target for alleviating energy stress at cold temperatures by dietary fat *** Dietary fat supplementation alleviated the negative effects of cold temperatures on growth performance and digestive enzymes, while hormonal homeostasis was also restored. Moreover, cold temperature exposure increased glucose transport in the jejunum. In contrast, we observed abnormalities in lipid metabolism, which was characterized by the accumulation of bile acids in the ileum and plasma. In addition, the results of the ileal metabolomic analysis were consistent with the energy metabolism measurements in the jejunum, and dietary fat supplementation increased the activity of the mitochondrial respiratory chain and lipid metabolism. As the central nexus of energy metabolism, the state of glycolipid metabolism and oxidative stress in the liver are inconsistent with that in the small intestine. Specifically, we found that cold temperature exposure increased glucose transport in the liver, which fully validates the idea that hormones can act on the liver to regulate glucose output. Additionally, dietary fat supplementation inhibited glucose transport and glycolysis, but increased gluconeogenesis, bile acid cycling, and lipid metabolism. Sustained activation of AMpK, which an energy receptor and regulator, leads to oxidative stress and apoptosis in the liver;dietary fat supplementation alleviates energy stress by reducing AMpK *** Cold s

关键词： Apoptosis Cold temperature Energy stress Fat Glucolipid metabolism Mitochondrial homeostasis

Ferroptosis and endoplasmic reticulum stress in ischemic stroke

在线全文

学校读者我要写书评

暂无评论

neural Regeneration Research 2024年第3期19卷 611-618页

作者： Yina Li Mingyang Li shi feng Qingxue Xu Xu Zhang Xiaoxing Xiong Lijuan Gu Central Laboratory Renmin Hospital of Wuhan UniversityWuhanHubei ProvinceChina Department of Anesthesiology Renmin Hospital of Wuhan UniversityWuhanHubei ProvinceChina Department of neurosurgery Renmin Hospital of Wuhan UniversityWuhanHubei ProvinceChina

Ferroptosis is a form of non-apoptotic programmed cell death,and its mechanisms mainly involve the accumulation of lipid peroxides,imbalance in the amino acid antioxidant system,and disordered iron *** primary organelle resp.nsible for coordinating external challenges and internal cell demands is the endoplasmic reticulum,and the progression of inflammatory diseases can trigger endoplasmic reticulum *** has suggested that ferroptosis may share pathways or interact with endoplasmic reticulum stress in many diseases and plays a role in cell *** and endoplasmic reticulum stress may occur after ischemic ***,there are few reports on the interactions of ferroptosis and endoplasmic reticulum stress with ischemic *** review summarized the recent research on the relationships between ferroptosis and endoplasmic reticulum stress and ischemic stroke,aiming to provide a reference for develop.ng treatments for ischemic stroke.

关键词： cell death endoplasmic reticulum stress ferroptosis ischemic stroke lipid peroxidation

Constructing S-scheme charge separation in cobalt phthalocyanine/oxygen-doped g-C_(3)n_(4) heterojunction with enhanced photothermal-assisted photocatalytic H_(2) evolution

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第1期43卷 198-211页

作者： Wei-Long shi Zheng Xu Yu-Xing shi Ling-Ling Li Jia-Lin Lu Xin-Hai Sun Xin Du feng Guo Chang-Yu Lu School of Material Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China School of Energy and power Jiangsu University of Science and TechnologyZhenjiang 212003JiangsuChina College of Chemistry Zhengzhou UniversityZhengzhou 450001China School of Water Resource and Environment Hebei Province Key Laboratory of Sustained Utilization and Development of Water RecourseHebei Center for Ecological and Environmental Geology ResearchHebei Geo UniversityShijiazhuang 050031China

Hydrogen acquisition from solar energy is an effective way to address energy crisis,which makes the development of efficient photocatalysts become the main direction of scientific ***,cobalt phthalocyanine/oxygen-doped g-C_(3)n_(4)(Copc/OCn) S-scheme heterojunction photocatalyst was designed by coupling multi-step calcination with solvothermal method for enhanced photothermal-assisted photocatalytic H_(2) *** multistep calcined g-C_(3)n_(4) is easier for O-dop.ng formation,and the ethanol solvothermal strategy is utilized to enhance the dispersion of Copc on OCn nano sheet surface and forms sufficient S-scheme heterojunction through *** addition,the active sites and excellent photothermal properties of Copc itself further improve the integrated photocatalytic activity of Copc/OCn S-scheme *** optimal photocatalytic hydrogen evolution rate of Copc/OCn S-scheme heterojunction photocatalyst reached 9.56 mmol·g^(-1)·h^(-1),which is 2.69 and 1.23 times higher than that of Cn and OCn,*** work provides a valuable design idea and scheme for enhancing the multi-factor co-assisted photocatalytic H_(2) evolution performance.

关键词： photothermal photocatalytic H_(2)evolution Cobalt phthalocyanine Oxygen-doped g-C_(3)n_(4) Sscheme heterojunction

In-situ growth of MIL-53(Fe)on charcoal sp.nge as a highly efficient and recyclable photocatalyst for removal of Cr(Ⅵ)

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第9期43卷 4344-4355页

作者： Zhuo-Fan Yu Ye Yang Hai-feng Zhuang Sheng-Dao Shan Mihail-Simion Beldean-Galea Qing-Quan Xue Xiao-feng Shen shi-Jie Li Key Laboratory of Recycling and Eco-Treatment of Waste Biomass of Zhejiang province School of Environmental and Natural ResourcesZhejiang University of Science and TechnologyHangzhou 310023China Faculty of Environmental Science and Engineering Babes-Bolyai University400294 Cluj-NapocaRomania Key Laboratory of pollution Exposure and Health Intervention of Zhejiang province Interdisciplinary Research Academy(IRA)Zhejiang Shuren UniversityHangzhou 310015China national Engineering Research Center for Marine Aquaculture Institute of Innovation&ApplicationZhejiang Ocean UniversityZhoushan 316022China

The application of metalDorganic frameworks(MOFs)is hindered by several crucial factors,including low photocatalytic efficiency,poor stability and challenges in *** this study,MIL-53(Fe)was grown in situ on a charcoal sp.nge(CS)with a large surface area,excellent mechanical properties,and high photocatalytic efficiency using a solvothermal method,thus addressing the above-mentioned shortcomings of MOF ***,CS/MIL-53(Fe)has an amazing light-harvesting capacity in the visible range,leading to a significant improvement in the utilization of *** results of the experiments indicate that CS/MIL-53(Fe)displays a higher photocatalytic activity(87%Cr(Ⅵ))when exposed to visible light than CS(58%)or MIL-53(Fe)(27%),attributing to the increased separation of photogenerated carriers.e-is the main reactive radical and dominates the photocatalytic reduction process,rooting from that e-can reduce Cr(Ⅵ)to low-toxicity Cr(Ⅲ).This study presents a novel method for constructing photocatalysts with large surface areas,superior mechanical characteristics,and enhanced photocatalytic ***,it achieves the resource utilization of agricultural and forestry waste.

关键词： Cr(Ⅵ) Charcoal sp.nge MIL-53(Fe) photocatalysis Light absorption

Semi-volatile organic compounds in a museum in China:A non-targeted screening approach

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2024年第9期67卷 2693-2705页

作者： SOnG ZiDong nIAn LuYing shi Meng REn Xiaop.ng TAnG Ming shi AnMei HAn Ying LIU Min WAnG LuYang ZHAnG Yinp.ng XU Ying feng XiaoMeng Department of Building Science Tsinghua UniversityBeijing 100084China Beijing Key Laboratory of Indoor Air Quality Evaluation and Control Beijing 100084China national Museum of China Beijing 100006China Department of Endocrinology Beijing Chao-Yang HospitalCapital Medical UniversityBeijing 100020China

non-targeted analysis(nTA)was conducted to identify semi-volatile organic compounds(SVOCs)in a museum in China using the gas chromatography(GC)-Orbitrap-mass spectrometer(MS).Approximately 160 SVOCs were detected,of which 93 had not been reported in previous studies of museum *** of the detected SVOCs were found to be associated with the chemical agents applied in conservation treatment and the materials used in *** results of hierarchical cluster analysis(HCA)indicated a spatial variation of SVOCs in the indoor air in the museum,but there were no obvious temporal differences of SVOCs observed in indoor ***'s correlation analysis showed that several classes of SVOCs were well correlated,suggesting their common *** and plasticizers were found to be the primary sources of SVOC pollution detected in the *** with compounds in outdoor air,indoor SVOCs had a lower level of unsaturation and more portions of chemically reduced *** study is the first of its kind to comprehensively characterize SVOCs in a museum using an automated nTA approach with *** SVOCs identified in the current study are likely to be present in other similar museums;therefore,further examination of their potential impacts on cultural heritage artifacts,museum personnel,and visitors may be warranted.

关键词： non-target analysis high-resolution mass spectrometry semi-volatile organic compounds museum environment air pollutants

Assessment of climate damage in China based on integrated assessment framework

在线全文

学校读者我要写书评

暂无评论

Advances in Climate Change Research 2024年第1期15卷 124-133页

作者： Jie LIU Xiang-Zhen shi Li YAnG Chang-Yi LIU Jin-Cheng WAnG Rui-Min ZHU Xue-Li shi Qiu-feng LIU International Business School Shanxi Normal UniversityXi'an 710062China University of Chinese Academy of Social Sciences Bejing 102488China School of Economics and Management Xinjiang UniversityUrumqi 830046China Global Energy Interconnection Development and Cooperation Organization(GEIDCO) Bejing 100031China Hubei Enshi College Enshi 445099China CMA Earth System Modeling and prediction Centre China Meteorological AdministrationBeijing 100081China national Climate Centre China Meteorological AdministrationBeijing 100081China

Develop.ng a localized and consistent model framework for climate loss and damage assessment is crucial for the policy-making of climate change mitigation and *** study introduces a comprehensive,multidisciplinary Integrated Assessment Model(IAM)framework for evaluating climate damage in China,utilizing BCC-SESM climate model and FUnD sectoral climate damage model under the SSp2-RCps *** a bottom-up approach,the research estimates climate damage across eight major sectors,recalibrates sectoral climate damage functions and parameters for China,and elucidates distinctions among direct climate loss,market climate loss,and aggregate climate *** findings reveal that the total climate damage function for China follows a quadratic pattern in resp.nse to temperature *** 2050,the estimated climate damage is projected to be 5.4%,5.7%,and 8.2%of GDp under RCp2.6,RCp4.5,and RCp8.5,***,both direct and market climate losses are projected to remain below 2%of GDp by 2050,while the aggregate climate loss could reach as high as 8.2%,which is predominantly attributed to non-market *** a sectoral perspective,under the RCp8.5 scenario,human health damage constitutes the largest share(61.9%)of the total climate loss by 2050,followed by sea-level rise damage(18.6%).This study sheds lights on the adaptation policy that should attach importance to the non-market sectors,particularly focusing on human health and sea-level rise.

关键词： Climate loss and damage Integrated assessment model(IAM) FUnD model Representative concentration pathways(RCps)scenario BCC-SESM

Regulation of the quantum barrier and carrier transport toward high-efficiency quasi-2D Dion-Jacobson tin perovskite solar cells

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 Energy Chemistry 2024年第8期95卷 200-207,I0005页

作者： Huanhuan Yao Chang shi Tai Wu Shurong Wang Mingyu Yin Liming Ding Yong Hua feng Hao School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu 611731SichuanChina College of Chemistry and Molecular Engineering Peking UniversityBeijing 100871China Yunnan Key Laboratory for Micro/nano Materials&Technology School of Materials and EnergyYunnan UniversityKunming 650091YunnanChina Center for Excellence in nanoscience(CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS)National Center for Nanoscience and TechnologyBeijing 100190China

Quasi-2D Dion-Jacobson(DJ)tin halide perovskite has attracted much attention due to its elimination of Van der Waals gap and enhanced environmental ***,the bulky organic spacers usually form a natural quantum well structure,which brings a large quantum barrier and poor film quality,further limiting the carrier transport and device ***,we designed three organic spacers with different chain lengths(ethylenediamine(EDA),1,3-prop.nediamine(pDA),and 1,4-butanediamine(BDA))to investigate the quantum barrier *** and experimental characterizations indicate that EDA with short chain can reduce the lattice distortion and dielectric confinement effect,which is beneficial to the effective dissociation of excitons and the inhibition of trap-free non-radiative *** addition,EDA cation shows strong interaction with the inorganic octahedron,realizing large aggregates in precursor solution and high-quality films with improved structural ***,femtosecond transient absorption proves that EDA cations can also weaken the formation of small n-phases with large quantum barrier to achieve effective carrier transport between different ***,the quasi-2D DJ(EDA)FA_(9)Sn_(10)I_(31)solar cells achieves a 7.07%power conversion efficiency with good environment ***,this work sheds light on the regulation of the quantum barrier and carrier transport through the chain length of organic spacer for qua si-2D DJ lead-free perovskites.

关键词： Chain lengths Organic spacers Quantum well Carrier transport Lattice distortion

Biomimetic chitin hydrogel via chemical transformation

在线全文

学校读者我要写书评

暂无评论

nano Research 2024年第2期17卷 771-777页

作者： Rui-Rui Liu Qian-Qian shi Yu-feng Meng Yong Zhou Li-Bo Mao Shu-Hong Yu Division of nanomaterials&Chemistry Hefei National Research Center for Physical Sciences at the MicroscaleDepartment of ChemistryInstitute of Biomimetic Materials&ChemistryAnhui Engineering Laboratory of Biomimetic MaterialsUniversity of Science and Technology of ChinaHefei 230026China College&Hospital of Stomatology Key Laboratory of Oral Diseases Research of Anhui ProvinceAnhui Medical UniversityHefei 230032China Department of Dental Implantology College&Hospital of StomatologyAnhui Medical UniversityHefei 230032China

Chitin hydrogel has been recognized as a promising material for various biomedical applications because of its biocompatibility and ***,the fabrication of strong chitin hydrogel remains a big challenge because of the insolubility of chitin in many solvents and the reduced chain length of chitin regenerated from *** herein introduce the fabrication of chitin hydrogel with biomimetic structure through the chemical transformation of chitosan,which is a water-soluble deacetylated derivative of *** reacetylation of the amino group in chitosan endows the obtained chitin hydrogel with outstanding resistance to swelling,degradation,extreme temperature and pH conditions,and organic *** chitin hydrogel has excellent mechanical properties while retaining a high water content(more than 95 wt.%).It also shows excellent antifouling performance that it resists the adhesion of proteins,bacteria,blood,and ***,as the initial chitosan solution can be feasibly frozen and templated by ice crystals,the chitin hydrogel structure can be either nacre-like or wood-like dep.nding on the freezing method of the precursory chitosan *** to these anisotropic structures,such chitin hydrogel can exhibit anisotropic mechanics and mass transfer *** current work provides a rational strategy to fabricate chitin hydrogels and paves the way for its practical applications as a superior biomedical material.

关键词： chitin hydrogel biomimetic structure chemical stability mechanical strength antifouling