期刊文献+
共找到7,730篇文章
< 1 2 250 >
每页显示 20 50 100
Carbon Footprint in Waste Sector of Hydropower Plant: A Case Study of Nam Theun 2 Hydropower Plant
1
作者 Souttiphong Keovongsa Keophousone Phonhalath Sengthavy Phommixay 《American Journal of Climate Change》 2024年第2期209-229,共21页
While hydropower is generally considered a clean energy source, it is important to recognize that their waste can still contribute to greenhouse gas emissions (GHG). The purpose of this study is to assess the carbon f... While hydropower is generally considered a clean energy source, it is important to recognize that their waste can still contribute to greenhouse gas emissions (GHG). The purpose of this study is to assess the carbon footprint associated with the waste sector throughout the operational phase of the Nam Theun 2 hydropower plant in Laos. Understanding the environmental impact of the waste sector is crucial for ensuring the plant’s sustainability. This study utilizes the theoretical estimation method recommended in the 2019 Refinement to the 2006 IPCC Guidelines for National Greenhouse Gas Inventories, as well as the Requirements for Specification with guidance at the organization level for quantification and reporting of GHG emissions and removals. We emphasize the significance of implementing sustainable waste management practices to reduce GHG emissions and minimize the environmental impact of hydropower operations. By conducting a comprehensive analysis, this paper also provides insights into the environmental implications of waste management in hydropower plants and identifies strategies to mitigate the carbon footprint in the waste sector. The findings contribute to a better understanding of the environmental sustainability of hydropower plants and provide valuable guidance for policymakers, energy producers, and environmental practitioners involved in hydropower plant design and operation. 展开更多
关键词 Waste sector Carbon Footprint Climate Change Hydropower Plant
下载PDF
2P3FL:A Novel Approach for Privacy Preserving in Financial Sectors Using Flower Federated Learning
2
作者 Sandeep Dasari Rajesh Kaluri 《Computer Modeling in Engineering & Sciences》 SCIE EI 2024年第8期2035-2051,共17页
The increasing data pool in finance sectors forces machine learning(ML)to step into new complications.Banking data has significant financial implications and is confidential.Combining users data from several organizat... The increasing data pool in finance sectors forces machine learning(ML)to step into new complications.Banking data has significant financial implications and is confidential.Combining users data from several organizations for various banking services may result in various intrusions and privacy leakages.As a result,this study employs federated learning(FL)using a flower paradigm to preserve each organization’s privacy while collaborating to build a robust shared global model.However,diverse data distributions in the collaborative training process might result in inadequate model learning and a lack of privacy.To address this issue,the present paper proposes the imple-mentation of Federated Averaging(FedAvg)and Federated Proximal(FedProx)methods in the flower framework,which take advantage of the data locality while training and guaranteeing global convergence.Resultantly improves the privacy of the local models.This analysis used the credit card and Canadian Institute for Cybersecurity Intrusion Detection Evaluation(CICIDS)datasets.Precision,recall,and accuracy as performance indicators to show the efficacy of the proposed strategy using FedAvg and FedProx.The experimental findings suggest that the proposed approach helps to safely use banking data from diverse sources to enhance customer banking services by obtaining accuracy of 99.55%and 83.72%for FedAvg and 99.57%,and 84.63%for FedProx. 展开更多
关键词 Federated learning FedAvg FedProx flower framework privacy preservation financial sectors
下载PDF
A Multi-Token Sector Antenna Neighbor Discovery Protocol for Directional Ad Hoc Networks
3
作者 Zhang Hang Li Bo +2 位作者 Yan Zhongjiang Yang Mao Li Xinru 《China Communications》 SCIE CSCD 2024年第7期149-168,共20页
In this paper,we propose a Multi-token Sector Antenna Neighbor Discovery(M-SAND)protocol to enhance the efficiency of neighbor discovery in asynchronous directional ad hoc networks.The central concept of our work invo... In this paper,we propose a Multi-token Sector Antenna Neighbor Discovery(M-SAND)protocol to enhance the efficiency of neighbor discovery in asynchronous directional ad hoc networks.The central concept of our work involves maintaining multiple tokens across the network.To prevent mutual interference among multi-token holders,we introduce the time and space non-interference theorems.Furthermore,we propose a master-slave strategy between tokens.When the master token holder(MTH)performs the neighbor discovery,it decides which 1-hop neighbor is the next MTH and which 2-hop neighbors can be the new slave token holders(STHs).Using this approach,the MTH and multiple STHs can simultaneously discover their neighbors without causing interference with each other.Building on this foundation,we provide a comprehensive procedure for the M-SAND protocol.We also conduct theoretical analyses on the maximum number of STHs and the lower bound of multi-token generation probability.Finally,simulation results demonstrate the time efficiency of the M-SAND protocol.When compared to the QSAND protocol,which uses only one token,the total neighbor discovery time is reduced by 28% when 6beams and 112 nodes are employed. 展开更多
关键词 multi-token neighbor discovery SAND protocol sector antenna ad hoc network
下载PDF
An Investigation into Green Total Factor Productivity in China's Carbon-Intensive Sectors and Its Influencing Factors
4
作者 Pu Lijuan Zhu Shuaihui 《Contemporary Social Sciences》 2024年第3期64-76,共13页
This paper uses an SBM-GML index model to assess Green Total Factor Productivity(GTFP)in China's carbon-intensive sectors and conducts an empirical investigation into which factors influence GTFP in these sectors.... This paper uses an SBM-GML index model to assess Green Total Factor Productivity(GTFP)in China's carbon-intensive sectors and conducts an empirical investigation into which factors influence GTFP in these sectors.The GTFP in the carbon-intensive sectors experienced a decline between 2006 and 2011,followed by an upward trend beginning in 2012.Technological progress was the primary driver of GTFP growth,while business size was also a notable contributor.Irrational energy structures negatively influenced the high-quality development of the carbon-intensive sectors,and environmental regulation and foreign direct investment(FDI)have not yet significantly impacted GTFP.Based on these findings,this paper suggests that the carbon-intensive sectors should expedite their green transitions by focusing on system improvement,technological innovations,energy revolutions,and high-level opening up. 展开更多
关键词 carbon-intensive sectors GTFP SBM-GML index model
下载PDF
Impacts of forest plantation programs on sectoral CO_(2) emissions regionally in New Zealand
5
作者 Saeed Solaymani Andrew Dunningham 《Journal of Forestry Research》 SCIE EI CAS CSCD 2024年第6期13-28,共16页
Investing in projects that support environmental benefits,such as tree harvesting,has the potential to reduce air pollution levels in the atmosphere in the future.However,this kind of investment may increase the curre... Investing in projects that support environmental benefits,such as tree harvesting,has the potential to reduce air pollution levels in the atmosphere in the future.However,this kind of investment may increase the current level of emissions.Therefore,it is necessary to estimate how much the policy affects the current level of CO_(2) emissions.This makes sure the policy doesn’t increase the level of CO_(2) emis-sions.This study aims to analyze the effect of the One Bil-lion Trees program on CO_(2) emissions in New Zealand by employing the 2020 input–output table analysis.This inves-tigation examines the direct and indirect effects of policy on both the demand and supply sides across six regions of New Zealand.The results of this study for the first year of plantation suggest that the policy increases the level of CO_(2) emissions in all regions,especially in the Waikato region.The direct and indirect impact of the policy leads to 64 kt of CO_(2) emissions on the demand side and 270 kt of CO_(2) emis-sions on the supply side.These lead to 0.19 and 0.74%of total CO_(2) emissions being attributed to investment shocks.Continuing the policy is recommended,as it has a low effect on CO_(2) emissions.However,it is crucial to prioritize the use of low-carbon machinery that uses fossil fuels during the plantation process. 展开更多
关键词 Regional input–output analysis Forest investment program sectoral CO_(2) emissions Environmental policies Supply-side policy Demand-side policy
下载PDF
An Assessment on the Impact of Technological Addiction on Workplace Productivity: Case of the Public Sector in Zimbabwe
6
作者 Nelson Matanana Prosper Tafadzwa Denhere +3 位作者 David Chibhoyi Allen Mutumwa Sithole Morgen Noah Ariel Mutongoreni 《World Journal of Engineering and Technology》 2024年第3期635-650,共16页
With the increasing integration of technology in modern workplaces, concerns have emerged regarding the addictive nature of technology and its potential consequences on employee productivity. This research aims to inv... With the increasing integration of technology in modern workplaces, concerns have emerged regarding the addictive nature of technology and its potential consequences on employee productivity. This research aims to investigate the impact of technological addiction on workplace productivity within the public sector of Zimbabwe. The study employed a mixed-methods approach, combining surveys, interviews, and a case study analysis, to examine the prevalence and effects of technological addiction in affecting productivity in the public sector of Zimbabwe. The findings indicate that excessive use of social media, and other digital distractions is a growing concern in the public sector, leading to decreased focus, missed deadlines, and strained teamwork. Factors such as unrestricted internet access, lack of clear usage policies, and inadequate self-regulation contribute to the problem The research outcomes also highlight the need for awareness and interventions to address social media addiction in the workplace, promote healthier technology use, and uphold productivity and employee well-being. 展开更多
关键词 Technology Addiction Workplace Productivity TECHNOLOGY Public sector Zimbabwe
下载PDF
An Assessment of Procurement Risks Management Systems in the Public Sector
7
作者 Atoapem Frimpong Barimah Joyce-Jael Amoafoa Mensah 《Chinese Business Review》 2024年第2期76-86,共11页
Risk management in public procurement is a critical aspect that needs to be addressed in the public sector.Several studies have been conducted to understand the challenges and factors influencing risk management in pu... Risk management in public procurement is a critical aspect that needs to be addressed in the public sector.Several studies have been conducted to understand the challenges and factors influencing risk management in public procurement.These studies have explored the importance of risk management principles,the role of political influence,and the need for effective risk assessment and anticipation.The research has also highlighted the need for specific risk management mechanisms and tools to be implemented in public procurement processes.Risk management reforms in the public sector are essential but often circumvented due to assorted reasons,such as political influence and the emergence of new risks.The research investigation employs a quantitative research design.A total of 380 questionnaires were recovered from respondents.The study showed that the public sector has a procurement risk management system that is effective,but there may be some areas for improvement in the prequalification process,onboarding process,and support provided to newly onboarded suppliers.Additionally,the public sector used some strategies to mitigate and control contract risks during the procurement process,but there were some areas for improvement in the review and lessons learned process,risk mitigation measures,contract monitoring and performance evaluation mechanisms,and communication and documentation process.Finally,the results suggest that there were constraints placed on the risk management strategies currently utilized by professionals working in the public sector.These constraints include insufficient support and buy-in from senior management and stakeholders,bureaucratic or administrative hurdles,inadequate policies and regulations,insufficient training and skill development opportunities,and insufficient resources.The study highlights the significance of tackling risk management in the realm of public procurement and offers valuable perspectives on avenues for enhancement,obstacles encountered by practitioners,and the necessity of thorough evaluation and revisions.Through the adoption of the suggestions originating from this study,governmental entities can improve their procurement risk management frameworks and guarantee improved adherence to risk management principles. 展开更多
关键词 public sector public procurement SUPPLIERS risk management STRATEGIES
下载PDF
The Influence of Information Technology(IT)on Accrual Accounting Adoption:The Case of the Jordanian Public Sector
8
作者 Moawiah Awad Alghizzawi Rosnia Masruki 《Journal of Modern Accounting and Auditing》 2024年第2期40-48,共9页
Jordan is one of many countries that intends to reform its public sector by adopting accrual accounting,which is primarily carried out through the International Public Sector Accounting Standards(IPSAS)implementation ... Jordan is one of many countries that intends to reform its public sector by adopting accrual accounting,which is primarily carried out through the International Public Sector Accounting Standards(IPSAS)implementation plan,scheduled to be completed by 2021.Considering the difficulties of adoption,this process cannot be completed without an appropriate Information Technology(IT)system capable of providing the accounting information required for this reform.Therefore,this study aims to examine the influence of IT on accrual accounting adoption in the Jordanian public sector.The study employed the quantitative survey approach.Based on 331 usable questionnaires,the descriptive findings showed that the use of IT in the Jordanian public sector is relevant to daily accounting transactions in general and to accrual accounting in particular.The regression analysis showed a positive,significant relationship between IT use and accrual accounting practice.The IT specialist should be able to understand the needs of public sector in adopting accrual-based accounting.In line with today’s digitalization age,which integrates advanced technologies and numerous techniques,this study suggests that a combination of accounting and IT experts is a value added to sharpen the competitiveness of public sector reform.This study contributes to the extant literature in public sector,concerning the relationship between IT and accrual accounting adoption in the context of Jordan. 展开更多
关键词 public sector accrual accounting adoption information technology JORDAN
下载PDF
Evolution of Handicraft Industries in the Textile Sector in Saudi Arabia: A Comprehensive Analysis of Trends and Innovations
9
作者 Mona A. Alfawaz 《Journal of Textile Science and Technology》 2024年第3期82-100,共19页
This review explores the evolution of the textile handicraft industry in Saudi Arabia, emphasizing its cultural and economic significance. The study highlights the transition from traditional practices to modern innov... This review explores the evolution of the textile handicraft industry in Saudi Arabia, emphasizing its cultural and economic significance. The study highlights the transition from traditional practices to modern innovations and examines the impact of globalization and technological advancements on the industry. Key innovations are discussed, demonstrating their role in enhancing textile production while preserving cultural heritage. Major challenges, such as competition from industrial textiles and the need for sustainable practices, are identified. Opportunities for growth are explored, including leveraging tourism and international markets to promote Saudi handicrafts. The social and cultural impacts of the sector are underscored, particularly in sustaining community traditions and providing economic opportunities for artisans. Strategic recommendations for supporting and advancing the industry are offered, ensuring its continued relevance and sustainability in a rapidly changing global market. This analysis provides a robust framework for understanding the current state and future potential of Saudi Arabia’s textile handicraft industry. 展开更多
关键词 Handicraft Industries Textile sector Saudi Arabia Cultural Heritage Traditional Crafts Modern Technology Sustainability Global Market Innovation Artisanal Products
下载PDF
Bangladeshi textile and garment sectors defied the global disasters and continued growth
10
《China Textile》 2024年第2期20-21,共2页
Bangladeshi textile and garment sectors defied the global challenges over the last five years and continued to grow although the growth momentum was not so strong before the COVID-19 pandemic.Before the start of the p... Bangladeshi textile and garment sectors defied the global challenges over the last five years and continued to grow although the growth momentum was not so strong before the COVID-19 pandemic.Before the start of the pandemic,both the textile and garment sectors were growing at a higher rate because of rising demand from the international clothing retailers and brands because of two main reasons including the trade war between USA and China and competitive prices of locally made garment. 展开更多
关键词 continued GARMENT sector
下载PDF
Artificial Intelligence Based on Resilient Leadership in the Health Sector-A Secondary Publication
11
作者 Elaine Bastidas Tapia 《Proceedings of Business and Economic Studies》 2024年第2期222-233,共12页
At present,it is impossible to deny the existence of artificial intelligence in various areas of social life,understood as the simulation of expert human intelligence from computer processes that involve learning,reas... At present,it is impossible to deny the existence of artificial intelligence in various areas of social life,understood as the simulation of expert human intelligence from computer processes that involve learning,reasoning,and self-correction,its benefits to the medical field,in particular,are innumerable,but their incorporation into health systems has been gradual for many reasons.According to the above,this research analyzed artificial intelligence based on resilient leadership in the health sector,for which qualitative research was carried out with a documentary-bibliographic design with printed and electronic documentary sources with theoretical contributions fromÁvila,Mayer,and Quesada[1],Morgan[2],Villa[3],and Finol[4],among others.It is highlighted that resilient leadership has become a strategic factor in all organizations,since times of uncertainty and changes lead institutions to properly manage the incorporation of technologies specifically AI,achieving in this way that the centers and professionals in the field of health assume the needs of the contexts and the innovations of the same.It is concluded that resilient leadership will allow artificial intelligence in the health sector to generate higher levels of learning and adaptability to the transformations that are necessary,whose resistance would make its application difficult and in the long run it will leave behind professionals who refuse to assume the contributions of these innovative techniques in medical practice. 展开更多
关键词 Artificial intelligence Resilient leadership Health sector
下载PDF
基于Sector/Sphere的气相色谱质谱联用多样本并行对齐算法 被引量:3
12
作者 杨辉华 任洪军 +4 位作者 李灵巧 段礼新 郭拓 杜玲玲 漆小泉 《计算机应用》 CSCD 北大核心 2013年第1期215-218,共4页
针对气相色谱质谱联用(GC-MS)数据处理过程复杂且计算量大、处理时间过长而严重拖延实验进度的问题,以多样本保留时间对齐为例,设计了基于分布式平台Sector/Sphere的GC-MS数据处理并行框架,实现了多样本并行对齐算法。首先分布式计算所... 针对气相色谱质谱联用(GC-MS)数据处理过程复杂且计算量大、处理时间过长而严重拖延实验进度的问题,以多样本保留时间对齐为例,设计了基于分布式平台Sector/Sphere的GC-MS数据处理并行框架,实现了多样本并行对齐算法。首先分布式计算所有样本的相似度矩阵;然后依据层次聚类原理将原样本集划分为小样本集,分布式对齐各小样本集内部的样本;最后以各小样本集的平均样本作为对齐依据合并各样本集的对齐结果。实验结果表明:多样本并行对齐算法的错误率为2.9%,由4台PC组成的集群处理大量样本时,最高加速比达到3.29;能够在保证较高正确率的前提下提升计算速度,解决处理时间过长的问题。 展开更多
关键词 sector Sphere平台 分布式计算 并行框架 多样本对齐
下载PDF
Rattan sector in Hainan Island,China:a case study 被引量:4
13
作者 李荣生 尹光天 +1 位作者 杨锦昌 邹文涛 《Journal of Forestry Research》 SCIE CAS CSCD 2007年第2期153-156,共4页
Hainan Island is the biggest supplier of domestic rattan canes in China and is considered the best area to develop rattan plantation in large-scale. This paper discusses the rattan production in Hainan Island on the b... Hainan Island is the biggest supplier of domestic rattan canes in China and is considered the best area to develop rattan plantation in large-scale. This paper discusses the rattan production in Hainan Island on the basis of comprehensively collected information on rattan through interviewing with farmers, middle man, manufacture and official, on-site observation and literatures. The stock of available rattan is more than 25×106kg, but the real production annually is 4×105 kg. The area of rattan plantation established during 2000-2005 was about 10000 hm2, however, they don not produce yet. Four indigenous rattan species (C. Simplicifolius, C. Faberii, C. Tetradactylus, D. margaritae ) and three kinds of exotic canes are mainly utilized in Hainan island. Large quality of canes is treated as timber regulated by government, tax should be paid and a license should be applied from the government if canes are transport out of Hainan Island. The production-to-consumption flow of rattan in Hainan Island was drawn out based on the investigation. Constraints and advantages of the rattan sector in Hainan are identified and recommendations are proposed finally. 展开更多
关键词 Rattan sector Hainan Island Production-to-consumption
下载PDF
非正式部门(informal sector):旅游研究中不可忽视的领域 被引量:15
14
作者 苏静 陆林 《旅游学刊》 CSSCI 北大核心 2009年第1期71-76,共6页
"非正式部门"是一个地区旅游经济的重要组成部分,已经成为国外旅游研究的热点之一,在我国尚没有引起学者们的广泛关注。本文首先介绍了国外在非正式部门概念方面的研究,描述了非正式部门概念的演化过程,总结了国外学者关于非... "非正式部门"是一个地区旅游经济的重要组成部分,已经成为国外旅游研究的热点之一,在我国尚没有引起学者们的广泛关注。本文首先介绍了国外在非正式部门概念方面的研究,描述了非正式部门概念的演化过程,总结了国外学者关于非正式部门特征的研究成果,建立了旅游非正式部门的研究框架。最后指出笔者对非正式部门的认识,以期引起学者们对这一领域的关注。 展开更多
关键词 非正式部门 旅游 研究框架
下载PDF
NEW SOLUTION SYSTEM FOR CIRCULAR SECTOR PLATE BENDING AND ITS APPLICATION 被引量:15
15
作者 Yao, W Zhong, WX Su, B 《Acta Mechanica Solida Sinica》 SCIE EI 1999年第4期307-315,共9页
Instead of the biharmonic type equation, a set of new governing equations and solving method for circular sector plate bending is presented based on the analogy between plate bending and plane elasticity problems. So ... Instead of the biharmonic type equation, a set of new governing equations and solving method for circular sector plate bending is presented based on the analogy between plate bending and plane elasticity problems. So the Hamiltonian system can also be applied to plate bending problems by introducing bending moment functions. The new method presents the analytical solution for the circular sector plate. The results show that the new method is effective. 展开更多
关键词 circular sector plate Hamiltonian system bending moment functions ANALOGY
下载PDF
嵌入式处理器中的Sector Cache:性能与面积的折衷
16
作者 左琦 付宇卓 鲁欣 《小型微型计算机系统》 CSCD 北大核心 2006年第1期166-170,共5页
SectorCache曾经被用于一些最早使用Cache技术的计算机系统中.虽然SectorCache的性能略差于普通Cache,但同样Cache容量下Sector结构所需的标记位明显少于普通结构.由于嵌入式处理器对芯片面积的要求非常严格,SectorCache的优点在嵌入式... SectorCache曾经被用于一些最早使用Cache技术的计算机系统中.虽然SectorCache的性能略差于普通Cache,但同样Cache容量下Sector结构所需的标记位明显少于普通结构.由于嵌入式处理器对芯片面积的要求非常严格,SectorCache的优点在嵌入式处理器中就更为明显.本文用基于仿真的方法详细分析了Sector结构的Cache在嵌入式应用环境下的性能.仿真结果表明,合理使用Sector结构可以以较小的性能代价有效地减少标记位数量.因此,采用SectorCache就可以在满足性能要求的前提下尽可能减小Cache控制器的面积.本文认为SectorCache是嵌入式处理器设计者进行性能/面积折衷有效手段. 展开更多
关键词 高速缓存 sector结构 嵌入式处理器 性能与面积 设计折衷
下载PDF
The Optimization Method of the Sector Partition Based on Metamorphic Voronoi Polygon 被引量:8
17
作者 韩松臣 张明 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2004年第1期7-12,共6页
Voronoi diagram is founded by using computational geometry based on originaldistribution of the waypoints, and then the elements from Voronoi diagram are metamorphosed by usingthe rule for airsppce partition, and the ... Voronoi diagram is founded by using computational geometry based on originaldistribution of the waypoints, and then the elements from Voronoi diagram are metamorphosed by usingthe rule for airsppce partition, and the controller's workload is accounted in each element that ismade up of Metamorphic Voronoi polygon. Then in accordance with the rule about balance ofcontroller's workload, Simulated Annealing algorithm (SA) is used to achieve the optimization ofcombination of those elements , and the new resolution has satisfied the restriction of two rulesfor airspace partition. Therefore, the boundaries of the aggregates of these elements are theoptimal borderlines of sectors. The result of actual airspace design example validates therationality of the sector optimization method presented in this paper. 展开更多
关键词 aero transportation management sector partition voronoi polygon controller' s workload simulated annealing algorithm
下载PDF
Tourism sectorization opportunity spectrum model and space partition of tourism urbanization area:a case of the Mayangxi ecotourism area,Fujian province,China 被引量:4
18
作者 TAO Hui LIU Jia-ming +1 位作者 DENG Yu DU Ao 《Journal of Mountain Science》 SCIE CSCD 2017年第3期595-608,共14页
Nowadays, tourism has become an increasingly significant driving force of modern urbanization in China. However, it has caused varieties of problems, such as resource unreasonable utilization, society unfair play, and... Nowadays, tourism has become an increasingly significant driving force of modern urbanization in China. However, it has caused varieties of problems, such as resource unreasonable utilization, society unfair play, and environment pollution, etc. Thus, the establishment of an efficient and sustainable space partition model for tourism urbanization, from the geographical perspective, is highly necessary and urgent. Herein, a new evaluation model of tourist town space, referred to as Tourism Sectorization Opportunity Spectrum(TSOS), is established on the relationships between productionliving-ecology spaces. TSOS is a kind of quantitative evaluation model involving such factors as urban living area, ecological conservation area and the tourism industry. Furthermore, the analysis of quantitative production-living-ecology spatial overlap has been utilized for space division in a tourism urbanization area. This paper, using both the TSOS model and GIS technology, analyzes the spatial restructure of the Mayangxi ecotourism area. Theresult demonstrates that tourism industrial space takes the Shanchong Village as a core which shows a pattern of local regional agglomeration and a fuzzy edge extending along the entire Mayangxi River. The urban living area should be consolidated in the Shili village with the supporting facilities and living space for tourism. In addition, Tianzhu Mountain forest park should be the key environmental protection area. The case study on the Mayangxi ecotourism area verifies that the TSOS model has strong operability. Therefore, TSOS model provides a scientific foundation for the space reconstruction of new urbanization area, and an effective tool for optimizing the space partition of a tourism urbanization area. 展开更多
关键词 Tourism urbanization sectorization Space reconstruction Tourism sectorization Opportunity spectrum Mayangxi ecotourism area
下载PDF
Metamorphism of the East Sector of the Southern Qinling Orogenic Belt and Its Geological Significance 被引量:7
19
作者 WEI Chunjing YANG Chonghui ZHANG Shouguang 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 1999年第1期65-77,共13页
The east sector of the southern Qinling belt is, lithologically, composed mainly of metapelites, ***qüartzites, marbles and small amount of metabasites and gneisses, whose protoliths are the Silurian, Devonian an... The east sector of the southern Qinling belt is, lithologically, composed mainly of metapelites, ***qüartzites, marbles and small amount of metabasites and gneisses, whose protoliths are the Silurian, Devonian and less commonly the Sinian and Upper Palaeozoic. They have been subjected at least to two epochs of metamorphism. The early epoch belongs to progressive metamorphism which is centered on high amphibolite-granulite fades in the Fuping area and changed outwards into low amphibolite facies (staurolite-kyanite zone), epidote amphibolite facies (garnet zone) and greenschist facies (chlorite and biotite zones), the metamorphic age of which is about 220–260 Ma. This early-epoch metamorphism belongs to different pressure types: the rocks from greenschist to low amphibolite facies belong to the typical medium-pressure type which shows geothermal gradients of about 17–20 ***C/km and was probably produced by a crustal thickening process related to continental collision, and the high amphibolite-granulite facies belongs to the low-pressure type which shows geothermal gradients of about 25–38 ***C/km and was probably affected by some magmatic heats. Based on the basic characteristics of the P-T paths of the different facies calculated from the garnet zonations, it can be deduced that the metamorphism of medium-pressure facies series took place during an imbricated thickening process, rather than during the uplifting process after thickening. The late-epoch metamorphism belongs to dynamic metamorphism of greenschist facies which is overprinted on the early-epoch metamorphic rocks and is Yanshanian or Himalayan in age, probably related to intracontinental orogeny. 展开更多
关键词 METAMORPHISM metamorphic minerals P-T conditions and paths east sector of the southern Qinling orogenic belt
下载PDF
Fluid Inclusion Geochemistry of Metallic Ore Deposits in the South- Central Sector of theDa Hinggan Mountains in China 被引量:3
20
作者 Sheng Jifu, Zhang Dequan and Li YanInstitute of Mineral Deposits, Chinese Academy of Geological Sciences, Beijing Jiang M inxi 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 1995年第3期289-302,共14页
Physicochemical parameters of mineralization such as temperature, pressure, salinity, density, composition and boiling of ore fluids as well as pH, Eh, fo2 and reducing parameter in theprocess of mineralization of maj... Physicochemical parameters of mineralization such as temperature, pressure, salinity, density, composition and boiling of ore fluids as well as pH, Eh, fo2 and reducing parameter in theprocess of mineralization of major ore deposits in the study district have been obtained by the authors through systematic observation and determination of characteristics and phase changes of fluid inclusions at different temperatures and analysis of gaseous and liquid phase compositions of the inclusions, thus providing a scientific basis for the division of mineralization-alteration stages, types of mineral deposits and minerogenetic series and the deepening of the knowledge about the ore-forming processes and mechanisms of mineral deposits. It is indicated that the deposits of the same type have similar fluid inclusion geochemical features and physicochemical parameters though they belong to different minerogenetic series, while the compositions of inclusions are not conditioned by deposit types but closely related to the minerogenetic series of deposits. 展开更多
关键词 south-central sector of the Da Hinggan Mountains metallic ore deposit fluid inclusion GEOCHEMISTRY
下载PDF
上一页 1 2 250 下一页 到第
使用帮助 返回顶部