期刊文献+
共找到150,981篇文章
< 1 2 250 >
每页显示 20 50 100
Research on Risk Identification and Industrial Governance of Digital Education Products Based on Data Annotation Technology
1
作者 Tong Lili Zeng Jia +1 位作者 Di Ying Wang Nan 《China Communications》 SCIE CSCD 2024年第3期273-282,共10页
The social transformation brought aboutby digital technology is deeply impacting various industries.Digital education products, with core technologiessuch as 5G, AI, IoT (Internet of Things),etc., are continuously pen... The social transformation brought aboutby digital technology is deeply impacting various industries.Digital education products, with core technologiessuch as 5G, AI, IoT (Internet of Things),etc., are continuously penetrating areas such as teaching,management, and evaluation. Apps, miniprograms,and emerging large-scale models are providingexcellent knowledge performance and flexiblecross-media output. However, they also exposerisks such as content discrimination and algorithmcommercialization. This paper conducts anevidence-based analysis of digital education productrisks from four dimensions: “digital resourcesinformationdissemination-algorithm design-cognitiveassessment”. It breaks through corresponding identificationtechnologies and, relying on the diverse characteristicsof governance systems, explores governancestrategies for digital education products from the threedomains of “regulators-developers-users”. 展开更多
关键词 digital education products industry governance risk identification
下载PDF
China's Maritime Governance:Practical Evolution and Theoretical Construction
2
作者 Cui Ye 《Contemporary International Relations》 2024年第4期26-48,共23页
Increasingly engaged in maritime governance,China has developed its distinct vision and gradually established a complete theoretical system surrounding it.In terms of discourse,China has proposed a collection of conce... Increasingly engaged in maritime governance,China has developed its distinct vision and gradually established a complete theoretical system surrounding it.In terms of discourse,China has proposed a collection of concepts and ideas including a maritime community with a shared future,the 2lst Century Maritime Silk Road,Blue Partnerships,and marine ecological civilization.In terms of connotations,China champions such values as lasting peace,common prosperity,openness and inclusiveness,and cleanness and beautifulness.Exteriorly and interiorly,we can observe the unique character of China's vision concerning maritime governance,which will continue to upgrade and bear fruit in future practices,boosting the development of Chinese maritime governance theories,multilateral maritime cooperation,and ocean-related international legislation.Guided by its vision,China is expected to contribute more to global maritime security and marine ecological civilization. 展开更多
关键词 China's vision of maritime governance global governance marine ecological civilization maritime community with a shared future
下载PDF
Goals and Challenges of Global AI Governance and Chinese Solutions
3
作者 Lu Chuanying 《Contemporary World》 2024年第4期15-19,共5页
In July 2023,United Nations(UN)Secretary-General Antonio Guterres called for the establishment of an entity agency responsible for artificial intelligence(AI)security governance,and organized an“AI High-level Advisor... In July 2023,United Nations(UN)Secretary-General Antonio Guterres called for the establishment of an entity agency responsible for artificial intelligence(AI)security governance,and organized an“AI High-level Advisory Committee”to explore pertinent issues,opening the prelude to global AI governance.In October 2023,Chinese President Xi Jinping put forward the Global AI Governance Initiative in his keynote address at the opening ceremony of the Third Belt and Road Forum for International Cooperation,elaborating China’s policy positions on AI governance to the international community. 展开更多
关键词 governance elude POLICY
下载PDF
Research on the Collaborative Governance of Social Responsibility in Online Audiovisual Enterprises
4
作者 Chuying Kang Muhammad Zaffwan Idris Juan Liu 《Social Networking》 2024年第1期1-13,共13页
This paper aims to analyze the present conditions of the social responsibility ecosystem in online audiovisual enterprises in the digital age. It focuses on the governance of social responsibility in these enterprises... This paper aims to analyze the present conditions of the social responsibility ecosystem in online audiovisual enterprises in the digital age. It focuses on the governance of social responsibility in these enterprises and conducts an in-depth analysis of the problems and influencing factors related to the social responsibility aberrations of online audiovisual enterprises. Drawing upon social responsibility theory and collaborative governance theory, this research constructs a social responsibility guidance and governance system guided by the public, supported by the voluntary fulfillment of responsibilities by online audiovisual enterprises, and based on the collaborative participation of diverse stakeholders. It explores and optimizes the implementation pathways of this system, providing theoretical support and practical guidance for promoting the sustainable development of online audiovisual enterprises. Furthermore, it aims to contribute to the creation of a harmonious Internet ecosystem. 展开更多
关键词 Online Audiovisual Enterprises Social Responsibility Collaborative governance
下载PDF
Do companies influenced by smart cities pay more attention to green governance?Mechanism and optimal spatial correlation
5
作者 Xiaoxu Guo Rao Zhang Yue Zhang 《Chinese Journal of Population,Resources and Environment》 2024年第1期48-57,共10页
Smart cities are a way for China to construct an innovative and environmentally conscious nation.The paper examines the impact of smart cities on corporate green governance and provides a theoretical foundation for fo... Smart cities are a way for China to construct an innovative and environmentally conscious nation.The paper examines the impact of smart cities on corporate green governance and provides a theoretical foundation for formulating and executing smart city policy in China.Based on panel data from Chinese A-share listed companies in Shanghai and Shenzhen from 2008 to 2020,this study constructs a multiperiod double-difference model to examine the influence of smart cities on corporate green governance.Additionally,it uses a spatial double-difference model to investigate the spatial spillover effect of smart cities on neighboring areas.The findings indicate that smart cities effectively enhance corporate green governance.Analyzing the influencing mechanisms reveals that resource allocation efficiency,technological innovation,management environmental awareness,and regional environmental enforcement efforts act as mediators.Furthermore,the study reveals that the impact of smart cities on promoting corporate green governance is more pronounced in regions with lower levels of marketization and resource-based cities.Moreover,the research explores the spatial spillover effects of smart cities,with an effective radius of approximately 350 km.The optimal spatial correlation zone for green governance of businesses in neighboring areas in relation to smart cities is within a range of 250-350 km.This is manifested by the significant promotion of green governance in neighboring area businesses facilitated by smart cities. 展开更多
关键词 Smart cities Corporate green governance Mediating effects Spatial associations
下载PDF
Enhancing transboundary natural tourism resources governance:unveiling the spatial pattern and its influencing factors
6
作者 ZHANG Shengrui ZHANG Tongyan +1 位作者 JU Hongrun WANG Yingjie 《Journal of Mountain Science》 SCIE CSCD 2024年第3期973-986,共14页
Tourism resources that span provincial boundaries in China play a pivotal role in regional development,yet effective governance poses persistent challenges.This study addresses this issue by constructing a comprehensi... Tourism resources that span provincial boundaries in China play a pivotal role in regional development,yet effective governance poses persistent challenges.This study addresses this issue by constructing a comprehensive database of transboundary natural tourism resources(TNTR)through amalgamation of diverse data sources.Utilizing the Getis-Ord Gi^(*),kernel density estimation,and geographical detectors,we scrutinize the spatial patterns of TNTR,focusing on both named and unnamed entities,while exploring the influencing factors.Our findings reveal 7883 identified TNTR in China,with mountain tourism resources emerging as the predominant type.Among provinces,Hunan boasts the highest count,while Shanghai exhibits the lowest.Southern China demonstrates a pronounced clustering trend in TNTR distribution,with the spatial arrangement of biological landscapes appearing more random compared to geological and water landscapes.Western China,characterized by intricate terrain,exhibits fewer TNTR,concurrently unveiling a significant presence of unnamed natural tourism resources.Crucially,administrative segmentation influences TNTR development,generating disparities in regional goals,developmental stages and intensities,and management approaches.In response to these variations,we advocate for strengthening the naming of the unnamed transboundary tourism resources,constructing a geographic database of TNTR for government and establishing a collaborative management mechanism based on TNTR database.Our research contributes to elucidating the intricate landscape of TNTR,offering insights for tailored governance strategies in the realm of cross-provincial tourism resource management. 展开更多
关键词 Transboundary natural tourism resources(TNTR) Spatial difference Spatial autocorrelation governance optimization China
下载PDF
Researching the Impact of the Quality of Village Governance on Farmers’Well-Being:From the Perspectives of Income and Occupational Differentiation
7
作者 Chen Qiulin Peng Ziwei Fu Gang 《Contemporary Social Sciences》 2024年第4期17-40,共24页
The goal of village governance is to improve the well-being of farmers,so this study aims to measure the impact the quality of village governance on the well-being of farmers.It also examines the heterogeneity of this... The goal of village governance is to improve the well-being of farmers,so this study aims to measure the impact the quality of village governance on the well-being of farmers.It also examines the heterogeneity of this impact across different farmer groups from the perspectives of income levels and occupational differentiation.To this end,this study developed an indicator system based on survey data collected from 1,442 farmers in the Sichuan,Shaanxi,and Gansu provinces,as well as the Ningxia Hui autonomous region.Multiple linear regression models were then used to analyze this data,and the findings revealed that improvements in the quality of village governance significantly increased the well-being of farmers.Specifically,primary-level empowerment and capacity building were shown to contribute the most to the enhancement of the farmers’well-being,followed by social inclusion,and social cohesion was found to have only a minimal effect.In terms of income levels,improving the quality of village governance benefited middle-income farmers the most,followed by low-income farmers,and it had the least effect on high-income farmers.In terms of occupations,full-time farmers gained the most from improvements in the quality of village governance,followed by off-farm farmers,with part-time farmers benefiting the least.Based on these findings,this study suggests that policymakers should improve the quality of village governance to enhance the well-being of farmers,focusing on the impact that level of income and occupational differentiation have on village governance. 展开更多
关键词 quality of village governance farmers’well-being DIFFERENTIATION
下载PDF
Evolution and Governance of the Structure of Marine Economic Networks in China’s Coastal Areas: Based on Sea-related A-share Listed Companies
8
作者 LI Bo CAO Gai 《Chinese Geographical Science》 SCIE CSCD 2024年第5期899-916,共18页
Data on discrete,isolated attributes of the marine economy are often used in traditional marine economic research.However,as the focus of urban research shifts from internal static attributes to external dynamic linka... Data on discrete,isolated attributes of the marine economy are often used in traditional marine economic research.However,as the focus of urban research shifts from internal static attributes to external dynamic linkages,the importance of marine economic net-work research is beginning to emerge.The construction of the marine economic network in China’s coastal areas is necessary to change the flow of land and sea resources and optimize regional marine economic development.Employing data from headquarters and branches of sea-related A-share listed enterprises to construct the marine economic network in China,we use social network analysis(SNA)to discuss the characteristics of its evolution as of 2010,2015,and 2020 and its governance.The following results were obtained.1)In terms of topological characteristics,the scale of the marine economic network in China’s coastal areas has accelerated and expan-ded,and the connections have become increasingly close;thus,this development has complex network characteristics.2)In terms of spatial structure,the intensity of the connection fluctuates and does not form stable development support;the group structure gradually becomes clear,but the overall pattern is fragmented;there are spatial differences in marine economic agglomeration radiation;the radi-ation effect of the eastern marine economic circle is obvious;and the polarization effect of northern and southern marine economic circles is significant.On this basis,we construct a framework for the governance of a marine economic network with the market,the government,and industry as the three governing bodies.By clarifying the driving factors and building objectives of marine economic network construction,this study aims to foster the high-quality development of China’s marine economy. 展开更多
关键词 marine economic network sea-related A-share listed companies social network analysis(SNA) network governance China’s coastal areas
下载PDF
Regarding the Regulatory Sandbox Route and Mechanism for Governance of Artificial Intelligence
9
作者 Ye Xuanhan 《科技与法律(中英文)》 2024年第5期136-148,共13页
The main challenge in AI governance today is striking a balance between controlling AI dangers and fostering AI innovation.Regulators in a number of nations have progressively extended the regulatory sandbox,which was... The main challenge in AI governance today is striking a balance between controlling AI dangers and fostering AI innovation.Regulators in a number of nations have progressively extended the regulatory sandbox,which was first implemented in the banking sector,to AI governance in an effort to reduce the conflict between regulation and innovation.The AI regulatory sandbox is a new and feasible route for AI governance in China that not only helps to manage the risks of technology application but also prevents inhibiting AI innovation.It keeps inventors'trial-and-error tolerance space inside the regulatory purview while offering a controlled setting for the development and testing of novel AI that hasn't yet been put on the market.By providing full-cycle governance of AI with the principles of agility and inclusive prudence,the regulatory sandbox offers an alternative to the conventional top-down hard regulation,expost regulation,and tight regulation.However,the current system also has inherent limitations and practical obstacles that need to be overcome by a more rational and effective approach.To achieve its positive impact on AI governance,the AI regulatory sandbox system should build and improve the access and exit mechanism,the coordination mechanism between the sandbox and personal information protection,and the mechanisms of exemption,disclosure,and communication. 展开更多
关键词 artificial intelligence governance regulatory sandbox agile regulation inclusive prudential regulation access and exit mechanism coordination mechanism
下载PDF
Research on the Path of Improving the Efficiency of Urban Community Governance from the Perspective of Collaborative Governance:A Case Study of Daqing City,China
10
作者 Fengbo Han 《Journal of Contemporary Educational Research》 2024年第1期45-51,共7页
Under the background of“co-construction,co-governance,and sharing,”the role of the grassroots level is becoming increasingly important.In the past,the governance body was single with blocked information,and the inef... Under the background of“co-construction,co-governance,and sharing,”the role of the grassroots level is becoming increasingly important.In the past,the governance body was single with blocked information,and the inefficient governance mode required gradual transformation.In order to achieve collaborative governance and break through the obstacles in grassroots governance,the key lies in how to play the role of the community,coordinate the relationship between citizens and the community,and allow the community to better play the role of grassroots governance.Under the guidance of the concept of collaborative governance and combined with relevant data,this paper discusses the problems and current situation of community governance in Daqing City,China,explores the path to improve the efficiency of urban community governance,and puts forward relevant constructive suggestions to better realize the role of community in grassroots governance. 展开更多
关键词 Collaborative governance Urban community governance
下载PDF
English Translation of Chinese Natural Ecological Discourse:A Corpus-based Case Study on Xi Jinping:The Governance of China
11
作者 TANG Yi 《Journal of Literature and Art Studies》 2024年第5期355-359,共5页
Amid the increasingly severe global natural eco-environment,it is necessary to build a natural ecological civilization by constructing an ecological civilization discourse.Against this background,this study compiles a... Amid the increasingly severe global natural eco-environment,it is necessary to build a natural ecological civilization by constructing an ecological civilization discourse.Against this background,this study compiles a corpus of natural ecological discourse in the English translation of Xi Jinping:The Governance of China(short for Xi).By using Wordsmith and AntConc,this study explores the linguistic features of the ecological discourse in English translation of Xi in the following dimensions,including high-frequency words,keywords,word collocations,concordance lines.This study aims to analyze the concepts and attitudes towards natural ecology,so as to provide certain valuable insights for the construction of China’s discourse on natural ecological civilization.The study found that the natural ecology discourse involving in the English translation of Xi turned out to be ecologically beneficial. 展开更多
关键词 Xi Jinping:The governance of China ecological discourse analysis English translation corpus
下载PDF
Can Religious Pluralism Influence Governance and Societal Cohesion?
12
作者 Yaron Katz 《Journalism and Mass Communication》 2024年第3期155-165,共11页
This analysis uncovers the complex interplay of religion,politics,and society in Israel,revealing the intricate dynamics of secular and religious ideologies.The study explores the deep ideological rift between secular... This analysis uncovers the complex interplay of religion,politics,and society in Israel,revealing the intricate dynamics of secular and religious ideologies.The study explores the deep ideological rift between secular and religious communities,a divide that profoundly impacts political stability and policymaking.This division often leads to political crises and reshuffling,with the political system characterized by unstable coalition governments.The research is grounded in the divisions over the state’s spiritual ideology,with significant Orthodox influence shaping policy on education,family law,and cultural affairs.The research shows the profound influence of religious parties on Israeli politics,significantly shaping the country’s policies and ideological direction.Influenced by external factors such as security threats and diplomatic challenges,the dynamic interaction between politics and religion shapes Israeli politics since religious parties advocate for policies that align with their interpretation of Jewish religious law,thereby impacting the role of religion in public policy.The influence of religious politics has led to a discernible shift toward greater religious orthodoxy in public life,driven by the political power of religious parties that prioritize religious values above secular democratic principles.The state’s endorsement of religious education and institutions shapes public policy and societal norms.The analysis examines the influence of religious values in public policy and the dynamic interaction between religious and political spheres,aimed to ensure that religion remains dominant in shaping societal norms and governance.This complex relationship demonstrates the ongoing challenges in balancing religious orthodoxy with secular principles,which poses difficulties and has implications for the stability and cohesion of Israeli society.The urgency and complexity of this task cannot be overstated,as it is crucial for the future of Israeli politics and religious dynamics. 展开更多
关键词 RELIGION PLURALISM governance POLITICS Israel
下载PDF
University Corporate Governance in the Literature From 2019 to 2024
13
作者 María del Rosario Molina González María Teresa Gaxiola Sánchez +3 位作者 María de Jesús Camargo Pacheco Marco Antonio Velderrain Rodríguez Rafael Campoy Mendoza Cruz García Lirios 《Journalism and Mass Communication》 2024年第3期179-188,共10页
Anti-pandemic policies impacted the governance of Higher Education Institutions(HEIs)through confinement and distancing strategies.Such an impact was observed in the identity,reputation,and image of the HEI in the fac... Anti-pandemic policies impacted the governance of Higher Education Institutions(HEIs)through confinement and distancing strategies.Such an impact was observed in the identity,reputation,and image of the HEI in the face of the health crisis.The objective of this work was to establish an empirical contrast between the theoretical structure consulted regarding the evaluations of summaries published from 2019 to 2024 by judges.A documentary,cross-sectional,and retrospective study was carried out with a sample of sources indexed in international repositories.The results demonstrate that image and age regulate the impact of identity and income on reputation.In relation to the state of the art,it is recommended to extend the study to sociocultural,demographic,economic,and educational variables in order to anticipate the transition from university governance to corporate governance. 展开更多
关键词 COVID governance model NODES neural networks
下载PDF
Environmental,Social,Governance(ESG)Influence on Company Value Registered IDXESGL 2020-2022
14
作者 Dwi Jayanti Siti Kustinah +2 位作者 Vita Citra Mulyandini Eddy Winarso Adelia Nidyanti 《Economics World》 2024年第1期35-41,共7页
Global warming has increased people’s awareness of environmental protection and social responsibility,which is also reflected in the way they invest,with environmental,social and corporate governance aspects starting... Global warming has increased people’s awareness of environmental protection and social responsibility,which is also reflected in the way they invest,with environmental,social and corporate governance aspects starting to receive more attention.The purpose of this study is to investigate how environmental,social,and governance(ESG)performance,as measured by ESG risk assessment,affects corporate value.The population of this study consists of his 90 companies registered in his IDXESGL using a sampling method based on purposive sampling,and the total sample includes his 60 companies.The data analysis method used is a simple linear regression test.The findings of this study show that ESG risk assessment influences corporate value. 展开更多
关键词 ENVIRONMENTAL SOCIAL governance corporate value
下载PDF
Application of Data Governance Models in the Context of the Digital Economy
15
作者 Xiaohan Yuan 《Proceedings of Business and Economic Studies》 2024年第4期172-176,共5页
In the context of the digital economy,the volume of data is growing exponentially,the types of data are becoming more diverse,and its value is increasing,often providing critical support for decision-making by enterpr... In the context of the digital economy,the volume of data is growing exponentially,the types of data are becoming more diverse,and its value is increasing,often providing critical support for decision-making by enterprises and government institutions.Effective data governance is a crucial tool for maximizing data value and mitigating data risks.This article examines the application of data governance models in the digital economy,aiming to offer technical insights and guidance for data-driven enterprises and governments in China.By elevating their data governance standards in the new era,this approach will comprehensively enhance their ability to harness digital value and ensure security in the digital economy,ultimately driving the continued growth of both the digital economy and society. 展开更多
关键词 Digital economy Data governance Artificial intelligence Blockchain technology
下载PDF
The Impact of Corporate Governance and Fair Value Accounting on Debt Contracts
16
作者 Dan Wu 《Proceedings of Business and Economic Studies》 2024年第4期202-206,共5页
This paper investigates the theoretical relationship between corporate governance,fair value accounting,and debt contracts.It primarily examines the individual impacts of corporate governance and fair value accounting... This paper investigates the theoretical relationship between corporate governance,fair value accounting,and debt contracts.It primarily examines the individual impacts of corporate governance and fair value accounting on debt contracts,while also exploring the influence of corporate governance on fair value accounting.The study emphasizes the importance of considering the interests and legal status of creditors in the context of debt contracts.The findings indicate that strong corporate governance can reduce the likelihood of debt default and that the company’s restructuring costs in the event of a default determine whether improved corporate governance will increase or decrease debt costs.Additionally,the study reveals that the strength of corporate governance affects the value relevance of fair value accounting.However,the impact of fair value accounting on debt contracts is not inherently positive or negative;for instance,companies may use fair value adjustments with manipulative intent to enhance performance.Ultimately,the research highlights that discussions about corporate governance should not prioritize shareholder interests exclusively but also consider the legitimate position of creditors. 展开更多
关键词 Corporate governance Debt contracts Debt default Fair value accounting
下载PDF
Designing and Implementing an Advanced Big Data Governance Platform
17
作者 Yekun Chen Tianqi Xu Yongjiang Xue 《Journal of Electronic Research and Application》 2024年第3期13-19,共7页
Contemporary mainstream big data governance platforms are built atop the big data ecosystem components,offering a one-stop development and analysis governance platform for the collection,transmission,storage,cleansing... Contemporary mainstream big data governance platforms are built atop the big data ecosystem components,offering a one-stop development and analysis governance platform for the collection,transmission,storage,cleansing,transformation,querying and analysis,data development,publishing,and subscription,sharing and exchange,management,and services of massive data.These platforms serve various role members who have internal and external data needs.However,in the era of big data,the rapid update and iteration of big data technologies,the diversification of data businesses,and the exponential growth of data present more challenges and uncertainties to the construction of big data governance platforms.This paper discusses how to effectively build a data governance platform under the big data system from the perspectives of functional architecture,logical architecture,data architecture,and functional design. 展开更多
关键词 Big data Data governance Cleansing and transformation Data development Sharing and exchange
下载PDF
平菇^(60)Co-γ诱变孢子杂交新种质的创制及其遗传多样性分析
18
作者 龚娜 刘国丽 +3 位作者 陈珣 马晓颖 肇莹 肖军 《核农学报》 CAS CSCD 北大核心 2024年第11期2047-2053,共7页
为了探究不同平菇品种对辐射的敏感性及适宜辐射剂量,以便快速准确地鉴别平菇的杂交后代,创制新平菇种质,从而加快育种进程,本研究利用10个^(60)Co-γ射线剂量分别辐射4种不同平菇的孢子悬浮液,对致死率进行统计,并获得了诱变菌株的孢... 为了探究不同平菇品种对辐射的敏感性及适宜辐射剂量,以便快速准确地鉴别平菇的杂交后代,创制新平菇种质,从而加快育种进程,本研究利用10个^(60)Co-γ射线剂量分别辐射4种不同平菇的孢子悬浮液,对致死率进行统计,并获得了诱变菌株的孢子单核体。随后配制杂交组合,开展了^(60)Co-γ诱变和杂交育种研究。基于简单序列重复(SSR)标记,对诱变后材料和杂交后代共39份材料进行了遗传多样性分析。结果表明,品种5178的适宜辐射剂量为500 Gy,时间为200 min;9408的适宜辐射剂量为600 Gy,时间为240 min;灰美2号的适宜辐射剂量为700 Gy,时间为280 min;榆黄菇T2的适宜辐射剂量为400 Gy,时间为160 min。筛选获得的35个长势良好的杂交子中,经SSR分子标记验证,这些菌株在8对引物扩增下呈现出不同的特异性条带。综上,本研究可快速、准确地鉴别杂交子,为平菇的辐射诱变和杂交育种提供了技术依据和理论参考。 展开更多
关键词 平菇 ^(60)co-γ诱变 致死率 拮抗反应 SSR
下载PDF
^(60)Co-γ射线对不同无花果品种一年生枝条的辐射效应分析
19
作者 巴哈依丁·吾甫尔 阿布来克·尼牙孜 +3 位作者 胡西旦·买买提 吕小龙 王浩淼 马会勤 《新疆农业科学》 CAS CSCD 北大核心 2024年第2期373-381,共9页
【目的】研究^(60)Co-γ射线对不同无花果品种一年生枝条死亡率、抗氧化酶活性等相关理化指标的影响,确定最佳辐射诱变剂量,为利用^(60)Co-γ射线辐射诱变技术提高无花果遗传多样性、创造新种质、培育优良新品种提供科学依据。【方法】... 【目的】研究^(60)Co-γ射线对不同无花果品种一年生枝条死亡率、抗氧化酶活性等相关理化指标的影响,确定最佳辐射诱变剂量,为利用^(60)Co-γ射线辐射诱变技术提高无花果遗传多样性、创造新种质、培育优良新品种提供科学依据。【方法】以无花果品种布兰瑞克和中华紫果一年生休眠枝为试材,采用^(60)Co-γ射线为辐照源,设置不同剂量0、30、45、60、75 Gy的辐射处理,分析辐照引起枝叶死亡率、酶活性等变化。【结果】随着辐射剂量的增加,2个无花果品种扦插苗成活率呈下降趋势,株高、茎粗、节间长度、叶片长度、叶片宽度和分枝数指标呈下降趋势,叶片长宽比差异不显著。中华紫果品种的SOD、POD、CAT等酶活性均呈现先增后减的趋势,分别在45、60 Gy剂量时达到峰值,MDA含量呈现一直上升趋势,H_(2)O_(2)含量呈现先增后降趋势。布兰瑞克品种的SOD、POD、CAT酶活性,随着辐射剂量的增加均呈现先降后增趋势。MDA、H_(2)O_(2)含量基本保持上升趋势。【结论】辐射导致无花果扦插苗幼苗生长缓慢、株高矮化、茎粗变细、叶片变小、分枝减少。中华紫果的半致死辐射剂量为56 Gy,布兰瑞克为70 Gy,布兰瑞克对辐射的耐受性高于中华紫果。 展开更多
关键词 ^(60)co-γ射线 无花果 辐射效应 酶活性
下载PDF
镁合金表面热喷涂WC-10Co-4Cr粒子沉积及分布特性
20
作者 方敏 蒋理帅祎 +1 位作者 刘富强 张治民 《科学技术与工程》 北大核心 2024年第8期3186-3192,共7页
为了探究高速空气燃料热喷涂(activated combustion-high velocity air fuel,AC-HVAF)过程中喷涂粒子撞击基材后的沉积特性。采用AC-HVAF热喷涂技术在AZ80镁合金基体上沉积WC-10Co-4Cr硬质涂层。通过离散沉积实验获得薄层沉积粒子,探讨... 为了探究高速空气燃料热喷涂(activated combustion-high velocity air fuel,AC-HVAF)过程中喷涂粒子撞击基材后的沉积特性。采用AC-HVAF热喷涂技术在AZ80镁合金基体上沉积WC-10Co-4Cr硬质涂层。通过离散沉积实验获得薄层沉积粒子,探讨各种沉积形貌的种类、形成原因、结合机制及射流中粒子的径向和轴向分布。结果表明:在AC-HVAF粒子沉积过程中,嵌入型沉积为主要的沉积形貌,同时包含少量的破碎型与空腔型沉积粒子。在涂层的形成过程中,嵌入型沉积对涂层/基体结合性能起重要作用;空腔型沉积的小颗粒及破碎型沉积的大颗粒是造成沉积效率下降的主要原因。喷涂粒子主要集中在射流中心,越靠近射流边缘,空腔型沉积粒子越多,最终导致AC-HVAF粒子射流呈现出空间分布特征。 展开更多
关键词 超音速火焰喷涂 WC-10co-4Cr 沉积状态 粒子射流 镁合金
下载PDF
上一页 1 2 250 下一页 到第
使用帮助 返回顶部