期刊文献+
共找到609篇文章
< 1 2 31 >
每页显示 20 50 100
Exploring the Lived Experiences of Employee Engagement at Maryland’s HBCUs Concerning Internal Control Systems:A Qualitative Phenomenological Study
1
作者 Sunny Aqualambeng 《Journal of Modern Accounting and Auditing》 2025年第4期252-280,共29页
This phenomenological qualitative study explored the lived experiences of employees at Maryland's Historically Black Colleges and Universities(HBCUs)concerning internal control systems through the theoretical lens... This phenomenological qualitative study explored the lived experiences of employees at Maryland's Historically Black Colleges and Universities(HBCUs)concerning internal control systems through the theoretical lenses of the COSO framework and employee engagement theory.Using semi-structured interviews with faculty and staff who had worked at the institution for more than three years,the research investigated how employees perceive leadership tone,risk assessment processes,policy implementation,communication channels,and evaluation mechanisms related to internal controls.The study revealed five major themes that characterize employee experiences with internal control systems at this HBCU.Leadership communication was found to be hierarchical but inclusive,though marked by inconsistent communication of ethical values and significant resource constraints affecting implementation.Risk management practices were predominantly reactive rather than proactive,with limited systematic risk assessment processes that focused more on academic risks than operational vulnerabilities.Policy implementation was characterized by unclear separation of duties,substantial workload imbalances,and limited resources that compromised effective control activities.Communication challenges emerged as a critical weakness,with participants describing information sharing as inconsistent,unclear,and selective,compounded by significant technology obstacles in accessing necessary information.The evaluation and improvement processes were found to be limited and primarily driven by external accreditation requirements rather than systematic internal monitoring,resulting in reactive responses to issues rather than proactive enhancement.The findings contribute to the limited research on internal control systems within HBCUs by providing phenomenological insights into how structural constraints including funding limitations,unclear role delineation,and reactive management approaches create barriers to implementing robust internal control systems.Despite institutional commitment to inclusive leadership and student success,the study reveals that addressing these challenges requires not only increased resources but also structural changes to workload distribution,communication practices,and a shift toward more proactive risk management and monitoring procedures.The research provides evidence-based insights for HBCU administrators seeking to strengthen internal control implementation while maintaining institutional mission and cultural values. 展开更多
关键词 internal control systems historically black colleges and universities COSO framework employee engagement phenomenological research higher education governance organizational leadership risk management
在线阅读 下载PDF
Preliminary study of Chinese Antarctic data management in accordance with the international framework
2
作者 程少华 朱建钢 +2 位作者 凌晓良 方斌贤 蒋从涛 《Chinese Journal of Polar Science》 1997年第2期72-79,共8页
Antarctic data management is the research focus, which the international Antarctic organizations, e.g. Antarctic Treaty Consultative Meeting(ATCM) , Scientific Committee on Antarctic Research(SCAR), and Council of Man... Antarctic data management is the research focus, which the international Antarctic organizations, e.g. Antarctic Treaty Consultative Meeting(ATCM) , Scientific Committee on Antarctic Research(SCAR), and Council of Managers of National Antarctic Programmes(COMNAP) have been paying close attention to and promoting actively. Through the co effort of international Antarctic organizations and member countries concerned in recent years, Antarctic Data Directory Syatem(ADDS) is established as the most important basic programme for development of the international Antarctic data management system. At present, Joint Committee on Antarctic Data Management(JCADM) is responsible for organizing and coordinating the international Antarctic data management, and implementing the project ADDS.In this paper the background on Antarctic data management in time sequence and the structure of international framework are introduced, meanwhile, it is necessary to develop ADDS first of all. The ADDS mainly consists of the two principal parts: National Antarctic Data Center(NADCs) of all the party members and Antarctic Main Directory(AMD), the best available technology for creating ADDS is to make full use of International Directory Network(IDN) and adopt its Directory Interchange Formats(DIF). In the light of the above requirements, combined with Chinese specific situation, the contents, technical and administrative methods on Chinese Antarctic data management are discussed to promote our related work. 展开更多
关键词 international framework Antarctic data management Antarctic Data Directory Syatem Antarctic Main Directory.
在线阅读 下载PDF
Review of International Accounting Standards Board (IASB) Proposed New Conceptual Framework: Discussion Paper (DP/2013/1)
3
作者 Zivanai Mazhambe 《Journal of Modern Accounting and Auditing》 2014年第8期835-845,共11页
The International Accounting Standards Board (IASB) is one of the largest independent accounting standard setters whose publications, International Financial Reporting Standards (IFRSs), have revolutionalized the ... The International Accounting Standards Board (IASB) is one of the largest independent accounting standard setters whose publications, International Financial Reporting Standards (IFRSs), have revolutionalized the accounting profession, investors, finance providers, and the entire accounting information stakeholder community. The conceptual frameworks are the theoretical accounting bases that are constituted by a set of principles that underlie as a bedrock foundation cornerstone for the development and updating of IFRSs. The existing conceptual frameworks were issued by IASB in 2010, after long years of protracted and wide consultation and joint project with the biggest American standard setter Financial Accounting Standards Board (FASB). In year 2013, the IASB embarked on a solo project to update the conceptual framework and issued a discussion paper (DP/2013/1) to its users and stakeholder community for comments. The methodology used in this study of an extensive review of literature (secondary/primary) from the discussion paper, existing conceptual framework, and comment letters from investors, accounting, insurance, and international audit firms has been manipulated. The findings revealed that the existing conceptual framework has opposing objectives especially that of decision usefulness (future-oriented information) and concepts of "prudence and stewardship/accountability", which are deeply embedded within the framework as subsumed, but their prominence has been overshadowed and watered down by not identifying them as objectives. The finding also revealed that almost all public accounting and audit firms are advocating not only for the reinstatement of the "prudence and stewardship/accountability" but also for a clear definition of recognition, de-recognition, and measurement of statement of financial position elements (assets and liabilities) and also elements of the comprehensive income statement (revenues and expenses), which have seriously compromised investors, public accounting profession, learning/teaching of a framework-based understanding, and the entire IFRS user stakeholder community. A recommendation for further studying the abandoned joint IASB/FASB project should be investigated in the best interest of international accounting standards convergence. 展开更多
关键词 international Accounting Standards Board (IASB) discussion paper (DP/2013/1) PRUDENCE STEWARDSHIP conceptual framework
在线阅读 下载PDF
Research on International Education Quality Assurance from a Legal Perspective
4
作者 Yao Lujia 《数字人文与教育技术研究》 2025年第3期16-27,共12页
Quality assurance has emerged as a critical issue in international education governance.Differences in national education standards,complexities in degree recognition,and disparities in regulatory capacity have posed ... Quality assurance has emerged as a critical issue in international education governance.Differences in national education standards,complexities in degree recognition,and disparities in regulatory capacity have posed significant challenges to educational equity and academic integrity,particularly in cooperation between developed and developing countries.From a legal perspective,quality assurance in international education is not merely a technical or administrative concern,but a matter of rights protection and institutional accountability.This study systematically examines international education quality assurance through a legal lens,focusing on its conceptual foundations,normative principles,institutional frameworks,and practical implementation.By analyzing international conventions,human rights law,domestic education legislation,and comparative regulatory practices,the study highlights fairness,transparency,and accountability as the core legal principles underpinning effective quality assurance.It further explores legal frameworks at both international and national levels,as well as regulatory practices in cross-border higher education and online education,identifying their achievements and persistent limitations.The findings indicate that while a multi-layered legal framework for international education quality assurance has gradually taken shape,its effectiveness remains constrained by weak enforcement mechanisms,uneven national implementation,and regulatory gaps in emerging educational forms.This study contributes to the literature by providing a systematic legal analysis of international education quality assurance and offers policy-relevant insights for strengthening legal coordination,enhancing governance capacity,and safeguarding educational rights in the context of globalization. 展开更多
关键词 international education Quality assurance Legal framework
在线阅读 下载PDF
ELISA试验室内质控框架构建方法改进初探
5
作者 段友斌 王瑞 +6 位作者 常乐 邱昌文 李志强 陈庚瑞 杨婧涓 何清 王露楠 《中国输血杂志》 2026年第1期103-108,共6页
目的对9家血站实验室室内质控数据进行统计分析,提出改进ELISA试验室内质控框架构建方法的参考建议,并进行验证。方法1)收集9家血站室内质控数据,以某国产HBsAg ELISA检测试剂为例进行分析;2)比较血站1各批次室内质控值是否存在差异;3)... 目的对9家血站实验室室内质控数据进行统计分析,提出改进ELISA试验室内质控框架构建方法的参考建议,并进行验证。方法1)收集9家血站室内质控数据,以某国产HBsAg ELISA检测试剂为例进行分析;2)比较血站1各批次室内质控值是否存在差异;3)统计分析9家血站室内质控批次使用情况、使用批次数、使用天数、质控次数、各批次均值和变异系数;4)采用改进的ELISA试验室内质控框架构建方法,构建血站1和血站9各批次室内质控的临时框架和固定框架,并对离群值进行判定。结果1)ELISA试验各批次室内质控数据有差异(P<0.01),宜更换质控品和试剂时均更换质控框架。2)9家血站之间使用的质控品和试剂批号、每批次质控次数、相同批号质控值差异较大,宜由各实验室单独建立室内质控框架。3)改进ELISA试验室内质控框架构建方法为:使用框架平移,即预实验均值和上一批次累积变异系数构建临时框架,如该批次使用时间≥20 d且质控数据≥20点,则累积20 d至少20个点后,汇集计算在控数据累积质控均值和标准差构建固定框架。使用该方法构建的临时框架和固定框架,判定血站1和血站9室内质控26个极端离群值均为失控。218个一般离群值,除10个被临时框架判定为正常外,其余均判定为警告和失控,能够有效监控试验稳定性。结论根据不同规模血站室内质控情况的统计分析结果,结合ELISA试验的特性、试剂质控品批间的不稳定性,建议在更换质控品或试剂批号时重新构建质控图,以框架平移建立临时框架,以累计数据计算固定框架,适用于不同规模血站实验室,能够对ELISA试验过程稳定性进行有效控制。 展开更多
关键词 ELISA试验 室内质控 质控框架 血站实验室
原文传递
基于COSO要素的公立医院招标采购关键风险识别与内部控制优化
6
作者 阮爱萍 胡新宇 《卫生经济研究》 北大核心 2026年第4期82-85,共4页
公立医院招标采购是高风险领域,关键风险集中体现在控制活动实效不足、信息与沟通不畅、监督机制薄弱三个方面。基于COSO要素,公立医院应加强对招标采购的内部控制,采取分阶段治理策略:采购前,聚焦信息与沟通,破解预算失控风险;采购实... 公立医院招标采购是高风险领域,关键风险集中体现在控制活动实效不足、信息与沟通不畅、监督机制薄弱三个方面。基于COSO要素,公立医院应加强对招标采购的内部控制,采取分阶段治理策略:采购前,聚焦信息与沟通,破解预算失控风险;采购实施阶段,以控制活动为抓手,规范评标失范风险;采购后,以强化监督为手段,督促财务报销合规。同时,辅以制度规范、组织协同与技术赋能构成的全流程基础支撑,以及监督闭环与持续改进机制,全面提高招标采购风险防控能力。 展开更多
关键词 公立医院 招标采购 风险识别 内部控制 COSO框架
暂未订购
国际中文教育阅读素养评价标准的建构
7
作者 王鸿滨 张洁 《贵州师范大学学报(社会科学版)》 2026年第2期96-109,共14页
“阅读素养”是国际中文教育中衡量学习者语言能力与文化理解水平的重要指标之一。构建本土化的阅读素养评价标准,对于提升国际中文教育质量具有重要意义。通过对文献的系统梳理,明确了国际中文教育阅读素养的概念内涵,并依托《国际中... “阅读素养”是国际中文教育中衡量学习者语言能力与文化理解水平的重要指标之一。构建本土化的阅读素养评价标准,对于提升国际中文教育质量具有重要意义。通过对文献的系统梳理,明确了国际中文教育阅读素养的概念内涵,并依托《国际中文教育中文阅读分级标准》构建了国际中文教育阅读素养的评价标准框架。在此基础上,组建专家小组研讨交流,遵循描述语撰写的基本原则,结合描述语库,对国际中文教育阅读素养评价标准进行了系统阐述。再采用德尔菲法和层次分析法对评价标准进行了两轮修订及权重赋值,构建了一个包含初中高3个级别,“阅读态度和行为”“阅读认知过程和策略”2个一级维度,“阅读态度”“阅读行为”“阅读过程”“阅读策略”4个二级维度及272条描述语的多维评价标准体系。该评价标准不仅为国际中文教育领域的阅读素养评价提供了科学的工具,也为中文教学实践中阅读素养的培养提供了有效的参考。 展开更多
关键词 《国际中文教育中文阅读分级标准》 阅读素养评价标准 描述语 德尔菲法 层次分析法
在线阅读 下载PDF
IAD框架下闲置宅基地盘活利用的内在逻辑与模式选择——基于天津市宅基地制度改革试点区的分析
8
作者 刘双良 李怡玮 《南宁师范大学学报(自然科学版)》 2026年第1期123-135,共13页
盘活利用闲置宅基地是深入实施乡村振兴战略、促进城乡融合发展的重要手段。文章借助制度分析与发展(Institutional Analysis and Development,IAD)框架,采用混合研究方法,以天津市宅基地制度改革试点区的3个村庄为研究对象,考察闲置宅... 盘活利用闲置宅基地是深入实施乡村振兴战略、促进城乡融合发展的重要手段。文章借助制度分析与发展(Institutional Analysis and Development,IAD)框架,采用混合研究方法,以天津市宅基地制度改革试点区的3个村庄为研究对象,考察闲置宅基地盘活利用实践,从外部变量、行动舞台、交互作用及结果等3个方面揭示其盘活利用逻辑并比较其中差异,剖析影响模式选择的关键因素,旨在为不同类型村庄提供适配模式与案例参考。通过IAD框架揭示了闲置宅基地盘活利用的“环境—行动—结果”逻辑链条。基于天津市宅基地制度改革试点区3个村庄的案例比较总结了3种盘活模式的适用范围。研究表明,闲置宅基地盘活利用需“因地制宜、分类施策”,强化盘活主体协同,优化利益分配,以实现土地增效、集体增收与农民增益的共赢目标。 展开更多
关键词 IAD框架 闲置宅基地 盘活利用 内在逻辑 模式选择
在线阅读 下载PDF
全球数字教育标准体系的构建逻辑与本地化机制探索——基于《国际数字教育标准体系框架2025》的深度解读
9
作者 李青 吴永和 +2 位作者 杜婧 郑莉 吴战杰 《现代教育技术》 2026年第4期128-136,共9页
面对全球数字教育标准碎片化、更新滞后、跨文化落地难等挑战,世界数字教育联盟发出倡议并编制了《国际数字教育标准体系框架2025》,为形成数字教育标准体系的全球共识提供了理论支撑。文章从体系框架概述、构建原则、核心模型、本地化... 面对全球数字教育标准碎片化、更新滞后、跨文化落地难等挑战,世界数字教育联盟发出倡议并编制了《国际数字教育标准体系框架2025》,为形成数字教育标准体系的全球共识提供了理论支撑。文章从体系框架概述、构建原则、核心模型、本地化应用机制、价值述评五个方面对该文件进行了解读。其中,文章重点阐释了体系框架的三维模型,指出该模型由业务领域、业务层级、场景/专题构成,能将复杂的标准化需求转化为可视化的立体地图;同时,详细剖析了以“分层应用+需求矩阵”为核心的本地化应用机制。文章的解读工作可为各国或地区制定数字教育标准规划、推动数字教育标准的本地化应用提供理论参照和实施路径,有助于推动该体系框架的理解、采纳与应用。 展开更多
关键词 数字教育 国际标准 体系框架 本地化应用 教育公平
在线阅读 下载PDF
全球公约下非学历资历与学历资历融通互认:国际实践与中国启示
10
作者 许玲 谢青松 +1 位作者 赵宏 张伟远 《中国职业技术教育》 北大核心 2026年第4期65-75,共11页
推动非学历资历与学历资历的融通互认,是我国构建中国特色终身学习制度体系、支撑教育强国建设的核心议题。对英联邦等国资历框架模式与美国和韩国学分银行模式进行比较分析,剖析其存在的局限性基础上,深入探究联合国教科文组织发布的... 推动非学历资历与学历资历的融通互认,是我国构建中国特色终身学习制度体系、支撑教育强国建设的核心议题。对英联邦等国资历框架模式与美国和韩国学分银行模式进行比较分析,剖析其存在的局限性基础上,深入探究联合国教科文组织发布的《承认高等教育相关资历全球公约》及其《操作指南》在理念、制度及实施层面所实现的系统性创新,归纳出联合国教科文组织全球公约下非学历资历与学历资历融通认证的四类实施路径。其对我国推动非学历资历与学历资历融通互认具有以下启示:确立“以学习成效为本”的融通理念;构建标准清晰、程序公正、质量可信的融通机制;建设数据驱动、协同高效、技术赋能的支撑体系;主动融入全球资历互认网络,以推动具有中国特色且国际兼容的终身学习制度建设。 展开更多
关键词 教育强国 终身学习 资历框架 学习成果认证 国际比较
原文传递
城市低空医疗物流规划建设的实践进展及体系建构
11
作者 陈喆妍 刘瑞骐 +1 位作者 刘合林 梁婧娜 《新建筑》 2026年第1期53-59,共7页
随着低空智能交通领域的发展,无人机以其灵活性高、响应速度快、运行成本相对较低等优势,有效提升了医疗物资配送的时效性与可靠性,促进了医疗资源的均衡分配。文章结合不同应用方向的相关国际实践经验和启示,系统探索了低空医疗物流的... 随着低空智能交通领域的发展,无人机以其灵活性高、响应速度快、运行成本相对较低等优势,有效提升了医疗物资配送的时效性与可靠性,促进了医疗资源的均衡分配。文章结合不同应用方向的相关国际实践经验和启示,系统探索了低空医疗物流的系统构成、配送框架,并基于我国低空医疗物流领域的发展现状,提出了构建成熟高效的低空医疗物流体系的发展路径,为提升城市应急保障能力提供了坚实的空间基础。 展开更多
关键词 低空经济 医疗物流 无人机 配送框架 国际实践 低空设施建设
在线阅读 下载PDF
A Gateway for Opening Up
12
作者 YU YUNQUAN 《ChinAfrica》 2026年第3期34-35,共2页
Hainan FTP will boost alignment with international rules in China’s opening up The Hainan Free Trade Port(FTP)represents a significant step forward in China’s pursuit of high-standard opening up and greater engageme... Hainan FTP will boost alignment with international rules in China’s opening up The Hainan Free Trade Port(FTP)represents a significant step forward in China’s pursuit of high-standard opening up and greater engagement in economic globalisation.Following years of exploration,the policy framework for the Hainan FTP has come into being,and the recent launch of island-wide special customs operations marks an important transition-from institutional design to full implementation. 展开更多
关键词 Special Customs Operations international Rules policy framework Hainan Free Trade Port free trade port ftp represents alignment international rules institutional design Opening Up
原文传递
Opportunities of the Integration Between Low-altitude Economy and Commercial Aerospace and Chinese Solutions
13
作者 Zhang Mengting Chen Chenggang 《China's Foreign Trade》 2026年第1期45-47,共3页
The 15th Five-Year Plan will begin in 2026,amid heightened global technological competition and rapid supply chain changes.At this pivotal moment,the low-altitude economy and commercial aerospace,once seen as futurist... The 15th Five-Year Plan will begin in 2026,amid heightened global technological competition and rapid supply chain changes.At this pivotal moment,the low-altitude economy and commercial aerospace,once seen as futuristic,are quickly transitioning from strategic concepts to large-scale manufacturing industries.These sectors now drive China’s high-quality development and support a new framework for international engagement. 展开更多
关键词 framework international engagement supply chain Chinese solutions commercial aerospaceonce th five year plan global technological competition low altitude economy lowaltitude economy
在线阅读 下载PDF
TOE框架下构建国际联合研究中心共生性创新生态系统路径初探
14
作者 朱崇高 程玲 《高科技与产业化》 2026年第2期76-80,共5页
面对当前复杂多变的国际形势,在国际联合研究中心基础上建立具有高度共生性的创新生态系统大有裨益,这将进一步提升我国科研机构的创新能力和可持续发展能力。本文采用TOE(Technology Organization Environment)框架,以共生性、创新生... 面对当前复杂多变的国际形势,在国际联合研究中心基础上建立具有高度共生性的创新生态系统大有裨益,这将进一步提升我国科研机构的创新能力和可持续发展能力。本文采用TOE(Technology Organization Environment)框架,以共生性、创新生态概念为基础,从技术、组织、环境、保障机制等方面梳理了创新生态系统共生性强弱的影响要素,证明利用TOE框架构建高共生性创新生态系统能显著提升国际联合研究中心的研发能力、管理效能和资源整合能力。本文还探索了国际联合研究中心共生性创新生态系统的构建方式,包括具体建设思路及相关政策建议,作为改进国际科技管理工作的参考。 展开更多
关键词 TOE框架 国际联合研究中心 共生性 创新生态系统
原文传递
The 2 ℃ Global Temperature Target and the Evolution of the Long-TermGoal of Addressing Climate Change-From the United Nations FrameworkConvention on Climate Change to the Paris Agreement 被引量:30
15
作者 Yun Gao Xiang Gao Xiaohua Zhang 《Engineering》 SCIE EI 2017年第2期272-278,共7页
The Paris Agreement proposed to keep the increase in global average temperature to well below 2 ℃ abovepre-industrial levels and to pursue efforts to limit the temperature increase to 1.5 ℃ above pre-industriallevel... The Paris Agreement proposed to keep the increase in global average temperature to well below 2 ℃ abovepre-industrial levels and to pursue efforts to limit the temperature increase to 1.5 ℃ above pre-industriallevels. It was thus the first international treaty to endow the 2 ℃ global temperature target with legal effect.The qualitative expression of the ultimate objective in Article 2 of the United Nations Framework Conventionon Climate Change (UNFCCC) has now evolved into the numerical temperature rise target in Article 2 of theParis Agreement. Starting with the Second Assessment Report (SAR) of the Intergovernmental Panel on Cli-mate Change (IPCC), an important task for subsequent assessments has been to provide scientific informa-tion to help determine the quantified long-term goal for UNFCCC negotiation. However, due to involvementin the value judgment within the scope of non-scientific assessment, the IPCC has never scientifically af-firmed the unacceptable extent of global temperature rise. The setting of the long-term goal for addressingclimate change has been a long process, and the 2 ℃ global temperature target is the political consensuson the basis of scientific assessment. This article analyzes the evolution of the long-term global goal foraddressing climate change and its impact on scientific assessment, negotiation processes, and global low-carbon development, from aspects of the origin of the target, the series of assessments carried out by the 1PCCfocusing on Article 2 of the UNFCCC, and the promotion of the global temperature goal at the political level. 展开更多
关键词 CLIMATE CHANGE international negotiationln tergovernmental Panel on CLIMATE CHANGE UNITED Nations framework CONVENTION on CLIMATE ChangeLong-term GOAL Critical vulnerability Intuitive building
在线阅读 下载PDF
An international program on Silk Road Disaster Risk Reduction--a Belt and Road initiative (2016-2020) 被引量:11
16
作者 LEI Yu CUI Peng +5 位作者 Amar Deep REGMI Virginia MURRAY Alessandro PASUTO Giacomo TITTI Muhammad SHAFIQUE Tilak PRIYADARSHANA D.G. 《Journal of Mountain Science》 SCIE CSCD 2018年第7期1383-1396,共14页
Belt and Road Initiative(BRI) is a Chinese national strategy which calls for cooperative economic, political and cultural exchange at the global level along the ancient Silk Road. The overwhelming natural hazards loca... Belt and Road Initiative(BRI) is a Chinese national strategy which calls for cooperative economic, political and cultural exchange at the global level along the ancient Silk Road. The overwhelming natural hazards located along the belt and road bring great challenges to the success of BRI. In this framework, a 5-year international program was launched to address issues related to hazards assessment and disaster risk reduction(DRR). The first workshop of this program was held in Beijing with international experts from over 15 countries. Risk conditions on Belt and Road Countries(BRCs) have been shared and science and technology advancements on DRR have been disseminated during the workshop. Under this program, six task forces have been setup to carry out collaborative research works and three prioritized study areas have been established. This workshop announced the launching of this program which involved partners from different countries including Pakistan, Nepal, Russia, Italy, United Kingdom, Sri Lanka and Tajikistan. The program adopted the objectives of Sendai Framework for Disaster Risk Reduction 2015-2030 and United Nation Sustainable Development Goals 2030 and was implemented to assess disaster risk in BRCs and to propose suitable measures for disaster control which can be appropriate both for an individual country and for specific sites. This paper deals with the outcomes of the workshop and points out opportunities for the near future international cooperation on this matter. 展开更多
关键词 Natural hazards Silk Road Disaster risk reduction Belt and Road Initiative Sendai framework international collaboration program
原文传递
Superposition of dual electric fields in covalent organic frameworks for efficient photocatalytic hydrogen evolution
17
作者 Chao Li Shuo Wang +8 位作者 Yuan Liub Xihe Huang Yan Zhuang Shuhong Wu Ying Wang Na Wen Kaifeng Wu Zhengxin Ding Jinlin Long 《Chinese Journal of Catalysis》 SCIE CAS CSCD 2024年第8期164-175,共12页
Covalent organic frameworks(COFs)are promising materials for converting solar energy into green hydrogen.However,limited charge separation and transport in COFs impede their application in the photocatalytic hydrogen ... Covalent organic frameworks(COFs)are promising materials for converting solar energy into green hydrogen.However,limited charge separation and transport in COFs impede their application in the photocatalytic hydrogen evolution reaction(HER).In this study,the intrinsically tunable internal bond electric field(IBEF)at the imine bonds of COFs was manipulated to cooperate with the internal molecular electric field(IMEF)induced by the donor-acceptor(D-A)structure for an efficient HER.The aligned orientation of IBEF and IMEF resulted in a remarkable H_(2) evolution rate of 57.3 mmol·g^(-1)·h^(-1)on TNCA,which was approximately 520 times higher than that of TCNA(0.11 mmol·g^(-1)·h^(-1))with the opposing electric field orientation.The superposition of the dual electric fields enables the IBEF to function as an accelerating field for electron transfer,kinetically facilitat-ing the migration of photogenerated electrons from D to A.Furthermore,theoretical calculations indicate that the inhomogeneous charge distribution at the C and N atoms in TNCA not only pro-vides a strong driving force for carrier transfer but also effectively hinders the return of free elec-trons to the valence band,improving the utilization of photoelectrons.This strategy of fabricating dual electric fields in COFs offers a novel approach to designing photocatalysts for clean energy synthesis. 展开更多
关键词 Covalent organic framework internal molecular electric field internal bond electric field PHOTOCATALYSIS Hydrogen evolution
在线阅读 下载PDF
食用植物油安全标准的国内外比较分析(一)——体系、结构、范围和分类对比 被引量:3
18
作者 赵晨伟 金青哲 王兴国 《粮油食品科技》 北大核心 2025年第4期1-6,共6页
本文从标准体系、文本结构、范围和分类4个方面系统对比了中国与国际食品法典委员会、欧盟、美国、日本、澳大利亚与新西兰、新加坡、印度、韩国和俄罗斯等国际组织、国家和地区食用植物油安全标准的差异。结果发现:标准体系方面,各国... 本文从标准体系、文本结构、范围和分类4个方面系统对比了中国与国际食品法典委员会、欧盟、美国、日本、澳大利亚与新西兰、新加坡、印度、韩国和俄罗斯等国际组织、国家和地区食用植物油安全标准的差异。结果发现:标准体系方面,各国按其国情制定了各自的植物油安全标准;标准文本结构方面,各国的食用植物油标准绝大多数包含了范围、理化指标、安全指标、标签等相关规定;范围和分类方面,各国的标准基本上涵盖了常见的植物油,并根据国情、依据加工深度或工艺做了不同的分类。这一分析可为中国食用植物油安全标准的制修订提供参考,以进一步完善中国食用植物油安全标准,保障消费者健康。 展开更多
关键词 食用植物油 标准体系 文本结构 范围 分类 国内外比较
在线阅读 下载PDF
上一页 1 2 31 下一页 到第
使用帮助 返回顶部