检索结果-南通市图书馆

原位构筑聚糠醇SEI膜用于稳定锌负极的机制研究

在线全文

学校读者我要写书评

暂无评论

稀有金属 2024年第7期48卷 965-975页

作者：匡玲瑶乔双王倩王星敏代金航古兴兴重庆工商大学环境与资源学院重庆400065 中国有研科技集团有限公司有科期刊出版(北京)有限公司北京100088

水系锌离子电池(AZIBs)由于锌金属含量丰富,安全性更高,被认为是锂离子电池很有潜能的替代品。但由于锌负极的无宿主性以及不均匀的剥离/电镀,且在水系电解液中锌表面存在腐蚀、钝化以及析氢等问题显著影响了水系锌电池的库伦效率以及... 详细信息

水系锌离子电池(AZIBs)由于锌金属含量丰富,安全性更高,被认为是锂离子电池很有潜能的替代品。但由于锌负极的无宿主性以及不均匀的剥离/电镀,且在水系电解液中锌表面存在腐蚀、钝化以及析氢等问题显著影响了水系锌电池的库伦效率以及循环稳定性,这也阻碍了AZIBs的进一步推广应用。通过催化糠醇在锌箔表面原位聚合形成一层致密平滑的聚糠醇(PFA)固液界面膜(SEI膜),从而阻碍锌负极被腐蚀以及抑制锌枝晶生长,有效地提升了锌负极的循环稳定性。在最佳SEI膜厚度(20μm)下,Zn@PFA负极在1 m A·cm^(-2)的电流密度下能稳定循环553 h,明显高于纯锌负极的76 h,此外,Zn@PFA与V_2O_5正极组成的全电池在1.0 A·g^(-1)电流密度循环200圈后,可逆容量仍高达100 m Ah·g^(-1),也优于裸锌负极与V_2O_5正极组成的全电池。为实现锌负极稳定循环提供了一种简便且可大规模化操作的策略。

关键词：锌负极防腐蚀锌枝晶聚糠醇(PFA) 人工固液界面膜(SEI膜)

Catalytic conversion of biomass-derived compounds to various amino acids: status and perspectives

在线全文

学校读者我要写书评

暂无评论

Frontiers of Chemical Science and Engineering 2023年第7期17卷 817-829页

作者： Benjing Xu jinhang dai Ziting Du Fukun Li Huan Liu Xingxing Gu Xingmin Wang Ning Li Jun Zhao Engineering Research Center for Waste Oil Recovery Technology and Equipment of Ministry of Education Chongqing Technology and Business UniversityChongqing 400067China College of Environment and Resources Chongqing Technology and Business UniversityChongqing 400067China Key Laboratory of Energy Resource Utilization from Agriculture Residue Academy of Agricultural Planning and EngineeringMinistry of Agriculture and Rural AffairsBeijing 100125China Department of Biology Hong Kong Baptist UniversityHong KongChina

Amino acids are important nitrogen-containing chemicals that have a variety of ***,fermentation is the widely employed method to produce amino acids;however,the products are mostly limited to natural amino acids in the *** synthesis is an alternative approach for the synthesis of amino acids with different types and configurations,where the use of renewable biomass-based feedstocks is highly *** date,several lignocellulose and triacylglycerol-derived intermediates,typicallyα-keto acids andα-hydroxyl acids,have been transformed into amino acids via the amination reaction in the presence of additional nitrogen sources(i.e.,NH3·H2O).Making full use of inherent nitrogen in biomass(i.e.,chitin and protein)to produce amino acids avoids the use of extra nitrogen sources and meets the requirements of green chemistry,which is attracting increasing *** this review,we summarize different chemical-catalytic systems for the transformation of biomass to amino *** outlook on the challenges and opportunities for more effective production of amino acids from biomass by catalytic methods is provided.

关键词： biomass amino acids chitin nitrogen-containing compounds lignocellulose

Effect of Nano Silver Modification on the Dielectric Properties of Ag@TiO_(2)/PVDF Composites

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) 2021年第3期36卷 303-310页

作者： dai jinhang MENG Shunliang YANG Chuntian Lv Wenzhong CHEN Xizi YIN Yuhao LIANG Fei Key Laboratory of Functional Materials for Electronic Information(B) Ministry of EducationHuazhong University of Science and TechnologyWuhan 430074China Wenzhou Institute of Industrial Science Wenzhou 325028China Huawei Technologies Co.Ltd. Shenzhen 518116China

To get a dielectric material with a high dielectric permittivity and suppressed dielectric loss,nano-Ag with a particle size of 20 nm and Ag@TiO_(2)core-shell particles with diameters of approximately 70-120 nm were embedded in polyvinylidene fluoride(PVDF)to fabricate nano-Ag/Ag@TiO_(2)/PVDF *** being modified by nano-Ag with 3 vol%optimal amount,the relative permittivity(ε_r)at 100 Hz of 50 vol%Ag@TiO_(2)/PVDF composites was 61,and the dielectric loss can be suppressed to 0.04,almost 96.4%lower than that of unmodified composites,and a higher frequency stability of bothε_r and loss has also been *** underlying mechanism of the reduced loss was attributed to Maxwell-Wagner polarization and the Coulomb blockade effect caused by the introduction of a small amount of nano-Ag,which will block the movement of electrons between metal nanoparticles and *** space charge polarization and conductance loss are weakened at lower and higher Ag@TiO_(2)filling ratios,respectively,thus leading to a very low loss of the composites.

关键词： polymer composites dielectric properties AC impedance spectrum Ag@TiO_(2)/PVDF coulomb blockade effect

EMCO-based Optimal Layout Design of Hybrid Wind-wave Energy Converters Array

在线全文

学校读者我要写书评

暂无评论

Protection and Control of Modern Power Systems 2024年第5期9卷 142-161页

作者： Bo Yang jinhang Duan Yunfeng Yan Bingqiang Liu Jianxiang Huang Lin Jiang Rui Han Faculty of Electric Power Engineering Kunming University of Science and TechnologyKunming 650500China College of Electrical Engineering Zhejiang UniversityHangzhou 310027China Company of Kunming Bureau of CSG EHV Transmission Company Kunming 650217China School of Electrical Engineering and Electronics University of LiverpoolLiverpool L693GJUK Company of Electric Power Science Research Institute State Grid Zhejiang Electric Power Company Ltd.Hangzhou 310014China

Marine renewable energy,combining wave energy converters(WECs)and floating wind turbines(FWTs)into hybrid wave-wind energy converters(HWWECs),garners significant global *** offer potential cost reductions,increased power generation,and enhanced system *** absorption power of high wind energy sites is primarily influenced by the complex hydrodynamic interactions among floating bodies,which are closely related to the location and wind-wave environment of high wind energy *** delve into the positive interactions among HWWECs,this paper proposes a HWWEC array optimization strategy based on the artificial ecosystem opti-mization-manta ray foraging optimization coordinated op-timizer(EMCO).In EMCO,the decomposition operator of artificial ecosystem optimization(AEO)and the flip-ping-dipper foraging operator of manta ray foraging opti-mization coordinated(MRFO)cooperate dynamically to effectively balance local exploitation and global *** validate the effectiveness of EMCO,experiments were conducted in scenarios with 3,5,8,and 20 HWWECs,and compared with five typical *** results demonstrate the existence of multiple optimal solutions for HWWEC *** achieves maximum total absorp-tion power and exhibits good ***,EMCO en-hances the q-factor values of HWWECs across four scales:1.0478,1.0586,1.0612,and 0.9965,*** Terms—Marine renewable energy,hybrid wind-wave energy converter,layout optimization,coordinating optimizer.

关键词： Marine renewable energy hybrid wind-wave energy converter layout optimization coordinating optimizer

核壳填料Ag@TiO_(2)对PTFE基复合材料微波介电性能的调控特性研究

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

电子元件与材料 2021年第5期40卷 460-467页

作者：郑金桥梁飞戴金航宋小军龚红伟中兴通讯股份有限公司产学研合作司广东深圳518057 华中科技大学光学与电子信息学院湖北武汉430074

高介电常数聚合物基微波介质材料同时具有较高的介电常数与良好的机械性能,拥有广阔的应用前景。本研究通过溶胶凝胶法在纳米银分散液中将钛酸四丁酯水解,制备了不同Ag/TiO_(2)摩尔比的Ag@TiO_(2)核壳颗粒,并作为填料与聚四氟乙烯(PTFE... 详细信息

高介电常数聚合物基微波介质材料同时具有较高的介电常数与良好的机械性能,拥有广阔的应用前景。本研究通过溶胶凝胶法在纳米银分散液中将钛酸四丁酯水解,制备了不同Ag/TiO_(2)摩尔比的Ag@TiO_(2)核壳颗粒,并作为填料与聚四氟乙烯(PTFE)复合制备出Ag@TiO_(2)/PTFE复合材料。通过X射线衍射分析、扫描电镜形貌分析、EDS分析等测试手段对实验样品形貌、组分进行了分析。采用核壳结构制备的Ag@TiO_(2)颗粒与PTFE复合后,样品的介电常数与损耗随Ag@TiO_(2)填充比例升高而递增,在填充比例为60%体积分数下可以制备出介电性能与导热性能俱佳、与金属相容性良好的微波介电材料。测试结果表明,在该比例下样品同时具有高介电常数(25.22)、低介电损耗(5.2×10^(-3))、较高的热导率(1.367 W/(m·K))和较低的线膨胀系数(25.6×10^(-6)/℃),可以满足微波无源器件轻量化、小型化的应用需求。

关键词： PTFE基复合材料 Ag@TiO_(2) 微波介电性能导热性能核壳结构

“先破后立”与“先立后破”——“两个结合”与中国共产党推进社会变革与发展的两种方法

在线全文

学校读者我要写书评

暂无评论

福建师范大学学报（哲学社会科学版） 2024年第5期 43-55页

作者：关锋上官锦行华南师范大学马克思主义学院广东广州510631

如何推动社会变革与发展是历史唯物主义的重要问题,也是马克思主义者必须解答的现实重大问题。中华传统文化中的“破立”思想既是中华民族千百年历史演进凝练出的变革智慧,也与唯物辩证法在世界观、人民观、方法论上存在自然的内在契合... 详细信息

如何推动社会变革与发展是历史唯物主义的重要问题,也是马克思主义者必须解答的现实重大问题。中华传统文化中的“破立”思想既是中华民族千百年历史演进凝练出的变革智慧,也与唯物辩证法在世界观、人民观、方法论上存在自然的内在契合,成为中国共产党推进具体革命与社会主义实践的独特思想资源。中国共产党在领导中国人民变革现实、促进社会发展的过程中,将这种自然契合不断推向有机结合,先后探索形成了“先破后立”与“先立后破”两种适用于不同社会历史环境的社会变革与发展方法,二者各有其基本特征。概而言之,“先破后立”以“生死斗争、于民有损、以破促立”三种情况作为其适用条件,“先立后破”则是“稳中求进、以立争时、以立促破”要求下的方法选择。两种方法都是唯物辩证法在社会变革与发展问题上的具体运用,其实质就是依据现实变革环境的具体状况把握“破”与“立”的辩证关系。在新时代把握与运用好“破”与“立”的辩证关系必须坚持问题导向、系统观念、人民至上的基本原则,更好促动全面深化改革向广度和深度进军。

关键词： “两个结合” 中国共产党中华优秀传统文化 “破立”思想先破后立先立后破

维普期刊数据库博看期刊

超声振动对激光沉积Ti-6Al-4V钛合金组织与性能的影响

在线全文

学校读者我要写书评

暂无评论

稀有金属 2024年第5期48卷 632-639页

作者：李长富杜金航钦兰云杨光王维沈阳航空航天大学机电工程学院航空制造工艺数字化国防重点学科实验室辽宁沈阳110136

采用多物理场仿真模拟,建立了垂直基板法向方向施加的超声幅场模型,得到的超声驻波幅场分布与实验结果相同。在未施加和施加驻波超声场的基板上,采用激光沉积制造(LDM)工艺制备了Ti-6Al-4V钛合金试样,对比分析了试样显微组织和力学性能... 详细信息

采用多物理场仿真模拟,建立了垂直基板法向方向施加的超声幅场模型,得到的超声驻波幅场分布与实验结果相同。在未施加和施加驻波超声场的基板上,采用激光沉积制造(LDM)工艺制备了Ti-6Al-4V钛合金试样,对比分析了试样显微组织和力学性能的差异,并对差异产生的原因进行了探讨。数值模拟结果表明,当以垂直基板法向方向施加超声场时,基板上形成驻波,基板的固有频率与超声频率是影响超声作用效果的关键因素,当超声频率为20.2 kHz时,驻波存在最高振幅,达到76μm。相比于无振动作用,超声引入可有效阻碍β柱状晶的生长趋势,细化β柱晶内部的α片层组织,被施加高振幅作用的试样在底部靠近基板区域的组织产生等轴β晶区和密集的亚晶界,激光熔覆层横截面硬度随振幅升高而显著提高,抗拉强度随振幅的升高提高4.2%,屈服强度随振幅的升高提高3.1%。驻波超声场在基板上的形成,实现了超声场对LDM制备Ti-6Al-4V钛合金组织与性能的有效调控,为LDM工艺制备更高质量钛合金构件提供重要的理论指导。

关键词：激光沉积制造(LDM) 驻波超声幅场显微组织力学性能

回应性动员:复杂政策执行中的参与动员机制研究

在线全文

学校读者我要写书评

暂无评论

南京农业大学学报（社会科学版） 2024年第1期24卷 94-104页

作者：郑永君张金行杨雯西北农林科技大学人文社会发展学院杨凌712100

本文构建了政策体制、动员机制与参与效能的关联性分析框架,立足历史变迁和乡村振兴实证案例,分析回应性动员促进农民治理性参与、实现乡村有效振兴的运作逻辑。研究表明:(1)我国的乡村政策体制大致经历了从简单汲取型到复杂给予型的变... 详细信息

本文构建了政策体制、动员机制与参与效能的关联性分析框架,立足历史变迁和乡村振兴实证案例,分析回应性动员促进农民治理性参与、实现乡村有效振兴的运作逻辑。研究表明:(1)我国的乡村政策体制大致经历了从简单汲取型到复杂给予型的变迁,政策体制的差异化特征形塑了参与动员机制的差异化。(2)乡村振兴政策具有模糊的政策目标、失衡的信息分布、高度的执行质量风险、差异化的治理结构等复杂政策特征。而基层政府和村两委在执行乡村振兴这一复杂政策时创新出回应性动员的农民参与动员机制。(3)回应性动员通过需求评估、多元协商、赋权增能、利益联结、组织引领等机制的协同发力,实现对农民参与的有效动员。由此衍生的回应性治理为基层政权建设和“国家-社会”治理张力的弥合提供了实践基础。

关键词：复杂政策政策体制参与动员机制回应性动员基层治理现代化

Epidemiology of liver diseases:global disease burden and forecasted research trends

在线全文

学校读者我要写书评

暂无评论

Science China Life Sciences 2024年

作者： Jia Xiao Fei Wang Yuan Yuan jinhang Gao Lu Xiao Chao Yan Feifei Guo Jiajun Zhong Zhaodi Che Wei Li Tian Lan Frank Tacke Vijay H.Shah Cui Li Hua Wang Erdan Dong Division of Gastroenterology and Hepatology Mayo Clinic Department of Health Sciences National Natural Science Foundation of China Department of Oncology The First Affiliated Hospital Institute for Liver Diseases of Anhui Medical University Inflammation and Immune Mediated Diseases Laboratory of Anhui Province Anhui Medical University Research Center for Cardiopulmonary Rehabilitation University of Health and Rehabilitation Sciences Qingdao Hospital(Qingdao Municipal Hospital) School of Health and Life Sciences University of Health and Rehabilitation Sciences Department of Cardiology and Institute of Vascular Medicine Peking University Third Hospital State Key Laboratory of Vascular Homeostasis and Remodeling Peking University Department of Gastroenterology Qingdao Central Hospital University of Health and Rehabilitation Sciences Guangdong Provincial Key Laboratory of Tumor Interventional Diagnosis and Treatment Zhuhai Hospital Affiliated with Jinan University Division of Gastroenterology Seventh Affiliated Hospital of Sun Yat-sen University School of Biological Sciences Jinan University Aier Institute of Ophthalmology Central South University Lab of Gastroenterology and Hepatology West China Hospital Sichuan University Clinical Medicine Research Institute and Department of Metabolic and Bariatric Surgery the First Affiliated Hospital of Jinan University Faculty of Pharmaceutical Sciences Toho University Department of Hepatology and Gastroenterology Charité-Universit?tsmedizin Berlin Campus Virchow-Klinikum and Campus Charité Mitte

We assessed the global incidence, mortality, and disability-adjusted life years(DALYs) associated with various liver diseases, including alcohol-related liver disease(ALD), hepatitis B/C virus infections(HBV or HCV), liver cancer, metabolic dysfunction-associated steatotic liver disease(MASLD), and other chronic liver diseases, from the 2019 Global Burden of Disease study. Additionally, we analyzed the global trends in hepatology research and drug development. From 2000 to 2019, prevalence rates increased for ALD, MASLD and other liver diseases, while they decreased for HBV, HCV, and liver cancer. Countries with a high socio-demographic index(SDI) exhibited the lowest mortality rates and DALYs. The burden of liver diseases varied due to factors like sex and region. In nine representative countries, MASLD,along with hepatobiliary cancer, showed highest increase in funding in hepatology research. Globally, the major research categories in hepatology papers from 2000 to 2019 were cancer, pathobiology, and MASLD. The United States(U.S.) was at the forefront of hepatology research, with China gradually increasing its influence over time. Hepatologists worldwide are increasingly focusing on studying the communication between the liver and other organs, while underestimating the research on ALD. Cancer, HCV, and MASLD were the primary diseases targeted for therapeutic development in clinical trials. However, the proportion of new drugs approved for the treatment of liver diseases was relatively low among all newly approved drugs in the U.S., China, Japan, and the European Union. Notably, there were no approved drug for the treatment of ALD in the world.

关键词：