检索结果-南通市图书馆

Platinum modification of metallic cobalt defect sites for efficient electrocatalytic oxidation of 5-hydroxymethylfurfural

引用

Journal of energy Chemistry 2025年第2期101卷 463-473页

作者： Haoyu Zhan Baixue Cheng Yankun Lu Danning Xing Xingshuai Lv Huining Huang Thomas Frauenheim Tao Wang Peng Zhou State Key Laboratory of Bio-fibers and Eco-textiles College of Materials Science and Engineering Collaborative Innovation Center of Shandong Marine Biobased Fibers and Ecological Textiles Institute of Marine Biobased Materials Qingdao University shandong Institute of Advanced Technology College of Chemistry and Chemical Engineering Ocean University of China Tianjin Key Laboratory of Advanced Functional Porous Materials Institute for New Energy Materials & Low-Carbon Technologies School of Materials Science and EngineeringTianjin University of Technology School of Science Constructor University Beijing Computational Science Research center College of Chemistry and Molecular Engineering Qingdao University of Science and Technology

Co3O4possesses both direct and indirect oxidation effects and is considered as a promising catalyst for the oxidation of 5-hydroxymethylfurfural（HMF）.However,the enrichment and activation effects of Co3O4on OH-and HMF are weak,which limits its further *** defect engineering can regulate the electronic structure,optimize the adsorption of intermediates,and improve the catalytic activity by breaking the symmetry of the material,which is rarely involved in the upgrading of *** this work,we prepare Co3O4with metal defects and load the precious metal platinum at the defect sites（PtVco）.The results of in-situ characterizatio ns,electrochemical measurements,and theoretical calculations indicate that the reduction of Co-Co coordination number and the formation of Pt-Co bond induce the decrease of electron filling in the antibonding orbitals of Co *** resulting upward shift of the d-band center of Co combined with the characteristic adsorption of Pt species synergically enhances the enrichment and activation of organic molecules and OH species,thus exhibiting excellent HMF oxidation activity(including a lower onset potential（1.14 V） and 19 times higher current density than pure Co3O4at 1.35 V).In summary,this work explores the adsorption enhancement mechanism of metal defect sites modified by precious metal in detail,provides a new option for improving the HMF oxidation activity of cobalt-based materials,broadens the application field of metal defect based materials,and gives an innovative guidance for the functional utilization of metal defect sites in biomass conversion.

关键词： Adsorption enhancement Biomass upgrading Coordination environment Electrocatalysis Metallic defect

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Mitochondria-targeted nanoparticles for encapsulating astaxanthin:exploring the reason for alleviating oxidative damage

引用

Food Science and Human Wellness 2025年第1期14卷 124-133页

作者： Yannan Chen Siyuan Fei Lijuan Zhang Mingqian Tan Academy of Food Interdisciplinary Science School of Food Science and TechnologyDalian Polytechnic UniversityDalian 116034China National Engineering Research center of Seafood Dalian Polytechnic UniversityDalian 116034China collaborative innovation center of Seafood Deep Processing Dalian Polytechnic UniversityDalian 116034China

Oxidative stress is considered as a critical factor in the process of pathological diseases,and mitochondria are considered as vital target organelles for disease *** purpose of this study was aimed to evaluate the antioxidant efficacy of mitochondria-targeted astaxanthin nanoparticle on hydrogen peroxideinduced oxidative *** expected,mitochondria-targeted nanoparticle showed excellent mitochondria co-localization ability with higher Pearson's correlation coefficient(r=0.88).In vitro experiments suggested that the mitochondria-targeted astaxanthin nanoparticle could promote cell viability and increase antioxidantrelated enzyme ***,metabolomics analysis indicated that mitochondria-targeted astaxanthin nanoparticle could alleviate oxidative stress by regulating amino acid metabolism and energy ***,all these results strongly confirmed the mitochondria-targeted strategy for astaxanthin delivery could relieve oxidative stress and had great promise in the application of disease intervention.

关键词： Oxidative stress Mitochondria-targeted Astaxanthin Antioxidant Metabolism

来源：

维普期刊数据库

同方期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Co encapsulated N-doped carbon nanotubes as robust catalyst for valorization of levulinic acid in aqueous media

引用

Journal of energy Chemistry 2021年第1期30卷 12-19,I0001页

作者： Xiangjin Kong Weijie Geng Wenxiu Li Lin Liu Xiaoqi Yan Longchen Gong Junhai Liu School of Chemistry and Chemical Engineering Shandong Provincial Key Laboratory/Collaborative Innovation Center of Chemical Energy Storage&Novel Cell TechnologyLiaocheng UniversityLiaocheng 252000ShandongChina

The construction of an acid resistant catalyst for synthesis of γ-valerolactone from levulinic acid in aqueous media is an important but highly challenging ***,an efficient Co@NCNT-800(after 800℃ pyrolysis) catalyst was constructed by confining Co in N-doped carbon nano-tubes(NCNT) from low cost materials by a facile *** with the characterization results and control experiments,the in situ formed Co and Co-Ox, but not Co-Nx, proved to be the main synergistic active sites of the *** was also found that Co species are completely isolated within the bamboo-like NCNT,which could protect the metal nanoparticles from agglomeration and leaching in the strong acid reaction *** γ-valerolactone yield of no less than 99.9% can be obtained under a relatively mild condition,and the catalytic performance has not been significantly reduced within five ***,this work may pave a way for the design of robust non-noble catalyst,and has potential for the production of γ-valerolactone from biomass in large-scale industries.

关键词： Levulinic acid γ-Valerolactone Co@N-doped carbon nanotubes Aqueous phase reaction

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Aspects of ultra-high voltage half-wavelength power transmission technology

引用

Global energy Interconnection 2018年第1期1卷 96-102页

作者： Yutian Liu Hao Tian Zhengzhong Liu Xiaohui Qin collaborative innovation center for Global energy Interconnection of shandong Province (shandong University) China Electric Power Research Institute

The necessity of large-scale and long-distance power transmission in future energy development is analyzed and some application scenarios of ultra-high voltage(UHV) half-wavelength transmission(HWLT) system are presented in the paper. Steady state and transient characteristics of half-wavelength transmission lines are reviewed in detail. The characteristics of UHV HWLT are very different from those of conventional UHV transmission mode, especially the overvoltage problem. To analyze the particularity and key techniques of UHV HWLT, current research results are summarized from simulation method, steady-state voltage control, relay protection, tuning network, secondary arc and overvoltage suppression, economic evaluation and engineering design. Some future research directions are also briefly addressed.

关键词： Global energy Interconnection Half-wavelength Ultra-high voltage transmission Power system

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Could coal-fired power plants with CCS be an effective way for carbon neutrality in China?

引用

Journal of Management Science and Engineering 2024年第4期9卷 461-473页

作者： Boqiang Lin Zhiwei Liu School of Management China Institute for Studies in Energy PolicyCollaborative Innovation Center for Energy Economics and Energy PolicyXiamen UniversityXiamen361005China

The transition toward carbon neutrality in China necessitates integrating more renewable energy sources(RES)into the power ***,a high share of RES can destabilize the grid,making it crucial to add clean,flexible power sources,such as battery energy storage systems(BESS)and flexible coal power combined with carbon capture and storage(CCS).This study shifted focus from traditional power plants to flexible power solutions,including BESS and CCS,and adopted a macro *** hourly basis simulation model of the power system was developed to assess the cost-effectiveness of these flexible power *** results revealed that BESS is more cost-effective when RES penetration rates are low,whereas CCS becomes more advantageous as RES constitutes a larger portion of the power *** BESS and CCS can ensure grid stability and maximize RES *** analysis indicated the need to control power demand growth to supportthis transition effectively.

关键词： Renewable energy resources Flexible power Battery energy storage system Carbon capture and storage

来源：

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

Optical chirality induced by spin–orbit interaction of light in a tightly focused Laguerre–Gaussian beam

引用

Chinese Physics B 2023年第11期32卷 419-425页

作者：朱明超付圣贵满忠胜 School of Physics and Optoelectronic Engineering Shandong University of TechnologyZibo 255000China collaborative innovation center of Light Manipulations and Application Shandong Normal UniversityJinan 250358China

Optical chirality is one of the important and fundamental dynamic properties of light besides energy, momentum,and angular momentum. The quantification of electromagnetic chirality has been conceptualized only recently. Now, it is well known that for paraxial plane waves of light, the optical chirality is proportional to the ellipticity of the polarization ellipse, i.e., completely independent of the phase distribution. Here it is shown that optical vortex and state of polarization of the source paraxial field both have contributions to the optical chirality of the nonparaxial field generated by tightly focused Laguerre–Gaussian(LG) beam, which is in Stark contrast to the paraxial plane wave of light known from classical optics. The physical reason is the redistribution of local electromagnetic polarization in three dimensions associated with spin–orbit interaction.

关键词： tight focusing optical chirality spin-orbit interaction

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Climate pledges versus commitment: Are policy actions of Middle-East and North African countries consistent with their emissions targets?

引用

Advances in Climate Change Research 2022年第4期13卷 612-621页

作者： Hermas ABUDU Presley K.WESSEH Jr Boqiang LIN School of Management China Institute for Studies in Energy PolicyCollaborative Innovation Center for Energy Economics and Energy PolicyXiamen UniversityFujian361005China Belt and Road Research Institute Xiamen UniversityFujian361005China

Carbon emission is inevitable,and changes with energy consumption and economic development,presents policy options toward sustainable development ***,there is little assurance from policymakers in committing to climate change pledges:taking the Middle-East and North African(MENA)region as a specific case with using 2019 as a cut-off *** conducted an interim assessment of the Paris Agreement to ascertain whether climate actions are in tandem with emissions reduction *** use of difference-in-difference technique as a quasiexperiment supported by fixed-effects and placebo treatment models,the results point to evidence of less than 1%effective CO_(2) emissions reduction as of 2019 compared to the 2015 *** current carbon emissions reduction commitment level is far-reaching contrary to the Nationally Determined Contributions(NDCs)pledged(16.43%on average by 2030 compared to the 2015 level).The analysis suggests that achieving NDCs commitments are currently major burden on policymakers since the economic development is highly linked with nonrenewable energy ***,a more comprehensive framework when accounting for all available renewable and clean energy projects shows reduction levels in the range of 30%-40%from 2020 to *** results suggest that the Paris Agreement in MENA countries may be more effective from 2020,thus underscore the importance of capturing ongoing projects(involving renewable and clean energy technologies)into interim policy *** shared implication is that greater efforts are demanded from the region and at country levels to further decrease emissions through the use of negative emissions technologies particularly in the electricity generation sector.

关键词： Paris Agreement Carbon emissions reduction potential Carbon effciency:Climate change policy quasi-experiment MENA climate change performance

来源：

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

Dynamically controlled asymmetric transmission of linearly polarized waves in VO_(2)-integrated Dirac semimetal metamaterials

引用

Chinese Physics B 2022年第6期31卷 671-677页

作者： Man Xu Xiaona Yin Jingjing Huang Meng Liu Huiyun Zhang Yuping Zhang College of Electronic and Information Engineering Shandong University of Science and TechnologyQingdao 266590China collaborative innovation center of Light Manipulations and Applications Shandong Normal UniversityJinan 250358China

We numerically demonstrated a novel chiral metamaterial to achieve broadband asymmetric transmission(AT)of linearly polarized electromagnetic waves in terahertz(THz)*** proposed metamaterial unit cell exhibits no rotational symmetry with vanadium dioxide(VO_(2)) inclusion embedded between Dirac semimetals(DSMs)*** resonant frequency of AT can be dynamically tunable by varying the Fermi energy(EF)of the *** insulator-to-metal phase transition of VO_(2) enables the amplitude of the AT to be dynamically *** transmission coefficient|T_(yx)|can be adjusted from 0.756 to nearly 0 by modifying the conductivity of VO_(2).Meanwhile,the AT parameter intensity of linearly polarized incidence can be actively controlled from 0.55 to almost 0,leading to a switch for *** VO_(2)is in its insulator state,the proposed device achieves broadband AT parameter greater than 0.5 from 1.21 THz to 1.80 THz with a bandwidth of 0.59 *** the incident wave propagates along the backward(-z)direction,the cross-polarized transmission|T_(yx)|reaches a peak value 0.756 at 1.32 THz,whereas the value of|T_(xy)|well below 0.157 in the concerned *** the other hand,the co-polarized transmission|T_(xx)|and|T_(yy)|remained equal in the whole frequency *** work provides a novel approach in developing broadband,tunable,as well as switchable AT electromagnetic devices.

关键词： terahertz chiral metamaterials asymmetric transmission tunable

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Regulation of the sintering trajectory of Ho,Pr:Y2O3 ceramics for 2.9μm mid-infrared lasers by atmospheric sintering

引用

Journal of Advanced Ceramics 2025年第1期14卷 81-89页

作者： Qing Li Fei Liang Jun Wang Yan Ling Xue Jie Ma Peng Liu Shiyu Sun Zhan Hui Jian Zhang Changhua Zhang Lili Hu Haohai Yu Huaijin Zhang Dingyuan Tang State Key Laboratory of Crystal Materials and Institute of Crystal Materials Shandong UniversityJinan 250100China Jiangsu Key Laboratory of Advanced Laser Materials and Devices School of Physics and Electronic EngineeringJiangsu Normal UniversityXuzhou 221116China Shanghai Key Laboratory of Multidimensional Information Processing School of Communication and Electronics EngineeringEast China Normal UniversityShanghai 200241China Shanghai Branch Hefei National Laboratoryand Shanghai Research Center for Quantum SciencesShanghai 201315China collaborative innovation center of Extreme Optics Shanxi UniversityTaiyuan 030006China Shanghai Institute of Optics and Fine Mechanics Chinese Academy of SciencesShanghai 201800China Shanghai Institute of Ceramics Chinese Academy of SciencesShanghai 201899China Future Technology School Shenzhen Technology UniversityShenzhen 518118China

The sintering trajectory of the Ho,Pr:Y2O3 ceramics could be effectively adjusted by sintering in a flowing oxygen atmosphere instead of *** final-stage grain growth was significantly suppressed by the use of oxygen atmosphere presintering,resulting in smaller average grain sizes than those of samples sintered under vacuum,while the same relative density was *** hot isostatic pressing(HIP),the oxygen presintered Ho,Pr:Y2O3 ceramics achieved excellent optical quality,with transmittance exceeding 80%at a wavelength of 680 *** codoping of Pr3+as deactivating ions effectively depopulated the lower energy level 5I7 during the Ho3+:5I6→5I7 transition,thereby making the Ho,Pr:Y2O3 ceramics more conducive to promoting population inversion in the 2.9μm laser wavelength range.

关键词： Y,O ceramics sinteringtrajectory Ho3/Pr+ mid-infraredlaser fluorescenceproperties

来源：

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

Few-layer metasurfaces with arbitrary scattering properties

引用

Science China(Physics,Mechanics & Astronomy) 2020年第8期63卷 2-13页

作者： Zhancheng Li Wenwei Liu Hua Cheng Shuqi Chen The Key Laboratory of Weak Light Nonlinear Photonics Ministry of EducationSchool of Physics and TEDA Institute of Applied PhysicsRenewable Energy Conversion and Storage CenterNankai UniversityTianjin 300071China The collaborative innovation center of Extreme Optics Shanxi UniversityTaiyuan 030006China collaborative innovation center of Light Manipulations and Applications Shandong Normal UniversityJinan 250358China

Metasurfaces,which are planar arrays of subwavelength artificial structures,have emerged as excellent platforms for the integration and miniaturization of electromagnetic devices and provided ample possibilities for single-dimensional and multi-dimensional manipulations of electromagnetic ***,owing to the limited interactions between planar thin metallic nanostructures and electromagnetic waves as well as intrinsic losses in metals,metasurfaces exhibit disadvantages in terms of efficiency,controllability,and *** advances in this field show that few-layer metasurfaces can overcome these ***-layer metasurfaces composed of more than one functional layer enable more degrees of design ***,they possess unprecedented capabilities for electromagnetic wave manipulation,which have considerable impact in the area of *** article reviews recent advances in few-layer metasurfaces from the viewpoint of their scattering *** scattering matrix theory is briefly introduced,and the advantages and drawbacks of few-layer metasurfaces for the realization of arbitrary scattering properties are ***,a detailed overview of typical few-layer metasurfaces with various scattering properties and their design principles is ***,an outlook on the future directions and challenges in this promising research area is presented.

关键词： few-layer metasurfaces light-matter interaction scattering matrix full-space manipulation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：