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Unveiling the impact and mechanism of digital technology on agricultural economic resilience
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作者 Tianshu Quan Hui Zhang +1 位作者 Tianli Quan Yi Yu 《Chinese Journal of Population,Resources and Environment》 2024年第2期136-145,共10页
Enhancing the economic resilience of agriculture is essential for promoting sustainable and high-quality agricultural development.The emergence of digital technology has created new opportunities in this field.However... Enhancing the economic resilience of agriculture is essential for promoting sustainable and high-quality agricultural development.The emergence of digital technology has created new opportunities in this field.However,existing research predominantly focuses on traditional agricultural factors and technologies.Therefore,the impact of digital technology on agricultural economic resilience within the broader context of the“production-operation-industry”system in agriculture has not been comprehensively explored.To bridge this gap,this study analyzes panel data from 30 Chinese provinces from 2011 to 2020.It employs the static Van Dorn’s law and a dynamic spatial panel model to examine how digital technology empowers agricultural resilience.The findings indicate a continuous strengthening of digital technology development in China,albeit with significant polarization and spatial imbalances.Moreover,the resilience of the agricultural economy undergoes notable fluctuations,initially narrowing and subsequently displaying an upward trend.Digital technology clearly plays a pivotal role in empowering resilience through agricultural scale operation,industrial transformation,and technological progress.Its impact,particularly on the promotion of resilience in the eastern region and non-grain-producing areas and on high-level agricultural economies,also shows regional and technological variations. 展开更多
关键词 Digital technology Agricultural economic resilience Counterfactual method Dynamic spatial panel model Agricultural scale
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Risk preferences and the low-carbon agricultural technology adoption:Evidence from rice production in China 被引量:1
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作者 MAO Hui QUAN Yu-rong FU Yong 《Journal of Integrative Agriculture》 SCIE CAS CSCD 2023年第8期2577-2590,共14页
Climate change which is mainly caused by carbon emissions is a global problem affecting the economic development and well-being of human society.Low-carbon agriculture is of particular significance in slowing down glo... Climate change which is mainly caused by carbon emissions is a global problem affecting the economic development and well-being of human society.Low-carbon agriculture is of particular significance in slowing down global warming and reaching the goal of“carbon peak and carbon neutrality”.Therefore,taking straw incorporation as an example,this paper aims to investigate the impact of risk preferences on farmers’low-carbon agricultural technology(LCAT)adoption.Based on a two-phase micro-survey data of 1038 rice farmers in Jiangsu,Jiangxi,and Hunan provinces,this paper uses experimental economics methods to measure farmers’risk aversion and loss aversion to obtain the real risk preferences information of the farmers.We also explore the data to examine the actual LCAT adoption behavior of farmers.The results revealed that both risk aversion and loss aversion significantly inhibit farmers’LCAT adoption:more risk-averse or more loss-averse farmers are less likely to adopt LCAT.It is further found that crop insurance,farm scale and governmental regulations can alleviate the negative impact of risk aversion and loss aversion on farmers’LCAT adoption.Therefore,we propose that local governments need to promote low-carbon agricultural development by propagating the benefits of LCAT,extending crop insurance,promoting appropriate scale operations,and strengthening governmental regulations to promote farmers’LCAT adoption. 展开更多
关键词 risk preferences crop insurance farm scale governmental regulations low-carbon agricultural technology
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Potential Applications of Nano-Scale Science and Technology in Geosciences and Experimental Studies of Nanometer-Sized Gold Adsorption on Minerals and Rocks 被引量:3
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作者 章振根 朱笑青 《Chinese Journal Of Geochemistry》 EI CAS 1997年第2期133-138,共6页
Potential applications of Nano-scale science and technology are discussed in mineralogy, ore deposits, cosmochemistry and environmental sciences. Adsorption of nanometersized gold was experimentally studied on a varie... Potential applications of Nano-scale science and technology are discussed in mineralogy, ore deposits, cosmochemistry and environmental sciences. Adsorption of nanometersized gold was experimentally studied on a variety of minerals and rocks. 展开更多
关键词 纳米技术 地球科学 地球化学 纳米金 吸收 矿物 岩石
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The Social Media and Technology Addiction and Its Associated Factors among University Students in Lebanon Using the Media and Technology Usage and Attitudes Scale (MTUAS)
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作者 Hala Sabbah +5 位作者 ve Berbari Rania Khamis Dalia Zorkot Sanaa Sabbah Nabil Droubi Ibtissam Sabbah 《Journal of Computer and Communications》 2019年第11期88-106,共19页
The contemporary developments of Information and Communication Technologies usage have fueled a popular concern. The young people are experiencing technology addiction behavior due to excessive media and technology us... The contemporary developments of Information and Communication Technologies usage have fueled a popular concern. The young people are experiencing technology addiction behavior due to excessive media and technology usage. A valid instrument is required to detect individuals at high risk of social media and technology addiction. Objective: The objectives of this study are to assess prevalence of the technology addiction using the Media and Technology Usage and Attitudes Scale (MTUAS) and to investigate the impacts of online social networking on health and academic performance of young university students in Lebanon. Methods: During the academic year 2017-2018, a cross-sectional study which enrolled 705 young university students was conducted. Data was collected using MTUAS questionnaire. The translation and cultural adaptation of the MTUAS followed a standardized protocol. The psychometric properties were then evaluated. We used multivariate regression analyses to determine which characteristics were associated with the technology addiction among students. Results: 705 filled out the questionnaire aged 17 to 35 years (mean = 20.42;SD = 2.41), 74% of whom were females. The internal consistency was high for all subscales and ranged from 0.54 - 0.87. The MTUAS yielded statistically significant scores for subgroups (known group validity). Males’ students had a higher risk of addiction to social media and technology than females. The use of media was viewed common among the smokers (OR = 1.76;95% CI = 1.10 - 2.82, p = 0.02) and drinkers of alcohol (OR = 1.80;95% CI = 1.04 - 3.11, p = 0.04). Students that used e-mailing, smartphone, and TV viewing had a high academic performance level. Females and public university students had negative attitudes toward technology. In conclusion: The technology becomes a big problem on the universities students’ users that has an impact on their life and affects their academic performance. The MTUAS Arabic version has been evaluated as a valid and reliable instrument. 展开更多
关键词 MEDIA and technology USAGE and ATTITUDES Scale (MTUAS) technology ADDICTION Behavior Young University Students Academic Performance
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Analysis on the High-end Feeding System and the Application Scenarios on the Lake Sheep Barn Feeding Scale Breeding Technology Research
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作者 Jie Xiao Panfeng sun 《International Journal of Technology Management》 2016年第7期32-34,共3页
In this paper, we conduct research on the high-end feeding system and the application scenarios on the lake sheep barn feeding scale breeding technology research. Sheep farm reproduction for the main places, so make s... In this paper, we conduct research on the high-end feeding system and the application scenarios on the lake sheep barn feeding scale breeding technology research. Sheep farm reproduction for the main places, so make sure sheep pen set reasonable. At the same time, we should reduce/avoid adverse effects caused by the surroundings of the flock, and conducive to the sheep’s normal growth and reproduction.Goats engineering technology mainly includes process of design and construction, building facilities, environmental control, waste treatment technology, sheep product processing technology, such as sheep breeding engineering technology is connected to the biological technology. This paper integrates the related theories to propose the countermeasures that will be meaningful. 展开更多
关键词 High-end Feeding Application Scenarios Lake Sheep Scale Breeding technology.
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Science & Technology and the Large-scale Operation of Farmland-- on the Important Measures of the Scale of China' s Farmland
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作者 Bao Yuan 《学术界》 CSSCI 北大核心 2013年第4期274-280,共7页
Although China in recent years has pushed for a large - scale operation of agricultural land,and agricultural modernization,the effect of the large - scale operation of farmland is unsatisfactory. Since a great many s... Although China in recent years has pushed for a large - scale operation of agricultural land,and agricultural modernization,the effect of the large - scale operation of farmland is unsatisfactory. Since a great many scholars have conducted a lot of research on this topic,this thesis,from the perspective of the application of science and technology in agriculture,probes into the main reasons for the ineffective large - scale operation of China's agricultural land,and puts forward several key measures of the large - scale development of China's agricultural land,trying to offer some suggestions for China's"new land reform movement". 展开更多
关键词 科学 规模化经营 农业现代化 农业土地 规模化发展 农业用地 中国
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Development trend and prospect of solid phase extraction technology 被引量:10
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作者 Chao Zhang Huifang Xing +2 位作者 Liangrong Yang Pengfei Fei Huizhou Liu 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2022年第2期245-255,共11页
Solid phase extraction is widely used in sample pretreatment,concentration and analysis processes due to high selectivity and suitability for low concentration sample system.In this review,we systematically summarized... Solid phase extraction is widely used in sample pretreatment,concentration and analysis processes due to high selectivity and suitability for low concentration sample system.In this review,we systematically summarized and discussed the development trends of solid phase extraction by bibliometrics method.By analyzing papers output scale,the research and development direction of solid phase extraction technology is prospected.We also give an overview on current strategies of novel solid phase extraction from the separation medium and separation technology.The paper aims to describe the global research profile and the development trends of solid phase extraction,to help researchers to accurately grasp the research trend and to provide support for scientific research institutions to formulate scientific policies and strategic plans.Furthermore,the prospect of the development and application of solid phase extraction is also discussed. 展开更多
关键词 Solid phase extraction Papers output scale Quality of research Novel technology
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Study on the detection methods of S&T frontier from the multi-dimensional perspective
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作者 ZENG Wen ZHENG Jia +3 位作者 WANG Dawei XIONG Shuling ZHANG Lei WEI Xiaoqi 《High Technology Letters》 EI CAS 2022年第1期91-97,共7页
The development of network and information technology has brought changes to the information environment.The sources of information are becoming more diverse,and intelligence acquisition will be more complicated.The i... The development of network and information technology has brought changes to the information environment.The sources of information are becoming more diverse,and intelligence acquisition will be more complicated.The intelligence reflected by different dimensions of scientific and technologi-cal(S&T)data will have their own focuses.It has become inevitable to carry out the multi-dimen-sional research of S&T frontier,which is also a current research hotspot.This paper uses quantita-tive and qualitative research methods to conduct research and analysis of S&T frontier detection from three dimensions including S&T research projects,S&T papers and patents,and proposes related re-search methods and development tools.This work analyzes the S&T frontiers in the field of artificial intelligence and draws conclusions based on the analysis results of real and effective S&T data in three dimensions. 展开更多
关键词 multi-dimensional scientific and technological(S&T) FRONTIER artificial intelli-gence
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Sustainable Technologies for Small-Scale Biochar Production—A Review
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作者 Hussein Kisiki Nsamba Sarah E. Hale +1 位作者 Gerard Cornelissen Robert Thomas Bachmann 《Journal of Sustainable Bioenergy Systems》 2015年第1期10-31,共22页
Charcoal has found enormous application in both agriculture (AKA biochar) and other sectors. Despite its potential benefits, small scale technologies relevant for its production remain a challenge. Technologies striki... Charcoal has found enormous application in both agriculture (AKA biochar) and other sectors. Despite its potential benefits, small scale technologies relevant for its production remain a challenge. Technologies striking a balance between user friendliness, energy efficiency, ease of adaptation and limited emissions could easily be integrated into the local community for the sustainable production of biochar answering both technical and socio-economic aspects. These technologies can be customized to recover the produced heat alongside biochar and the producer gas. The purpose of this work is to review the state of the art in small scale technologies, their associated risks and challenges as well as research gaps for future work. Factors affecting biochar production have been discussed and temperature is known to heavily influence the biomass to biochar conversion process. Based on the reviewed work, there is a need to develop and promote sustainable and efficient technologies that can be integrated into biochar production systems. There is also further need to develop portable, economically viable technologies that could be integrated into the biochar production process without compromising the quality of produced biochar. Such technologies at midscale level can be channeled into conventional small scale farmer use in order that the farmers can process their own biochar. 展开更多
关键词 BIOCHAR technologies Small SCALE SUSTAINABLE FARMERS
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The Planned Conservation of the Urban Fortifications of Tuscany: Satellite Interferometry as an Innovative Monitoring Technology for Asset Management
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作者 Daniela Ladiana 《Journal of Civil Engineering and Architecture》 2020年第5期263-270,共8页
The “Monitoring City Walls” research project by the University of Pisa approaches planned conservation as a process that pursues an in-depth understanding of historic city walls and their surroundings to define a sy... The “Monitoring City Walls” research project by the University of Pisa approaches planned conservation as a process that pursues an in-depth understanding of historic city walls and their surroundings to define a system of effective risk prevention. This multidisciplinary research adopts monitoring strategies and technologies at the large scale and in relationship to natural and urban conditions. The underlying logic frames the conservation of these historic fortifications within the more general mitigation of risks generated by context. The research aims to develop an innovative approach to monitoring ancient defensive structures in historical towns. The integrated use of advanced technologies allows for the control and, most importantly, advance identification of possible risks. These new technologies, in particular satellite interferometry, make it possible to improve and increase the operational capacity of monitoring processes by facilitating the acquisition and investigation of data relative to the system defined by ancient city walls and their surroundings. These technologies also represent a cost-effective tool for managing the important transition from the observation and study of individual monuments to the monitoring of large monumental complexes or even entire historical centers. 展开更多
关键词 Infrastructure monitoring FORTIFICATIONS urban scale innovative technologies satellite interferometry
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Research into the Assessment of the Intercultural Sensitivity Among University Students of Science and Technology
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作者 Mei-Lan Huang 《Sino-US English Teaching》 2013年第2期110-116,共7页
Globalization makes people from diverse cultural backgrounds communicate effectively. To be a global citizen has become the goal of our education. Landis and Bhagat (1996) argued that intercultural sensitivity is cr... Globalization makes people from diverse cultural backgrounds communicate effectively. To be a global citizen has become the goal of our education. Landis and Bhagat (1996) argued that intercultural sensitivity is crucial to enable people to live and work with others from different cultural backgrounds. With higher intercultural sensitivity, one will be more global as his understanding of cultural difference becomes more sophisticated. In this present study, the intercultural sensitivity of different majors from a private institute of technology in the north of Taiwan was investigated, using the ISS (Intercultural Sensitivity Scale) developed by Chen and Starosta (2000). Based on a survey of 358 participants from Nursing Department and Department of Nutrition and Health Sciences, this study focused on five dimensions of the intercultural sensitivity and the participants' demographic factors affecting their performance on intercultural sensitivity. The five dimensions included in this study were: (1) interaction engagement, (2) interaction confidence, (3) respect for cultural differences, (4) interaction enjoyment, and (5) interaction attentiveness. Among the five dimensions of intercultural sensitivity, the participants had the highest score on the dimension of "respect for the cultural differences" and had the lowest score on the dimension of "interaction confidence". Results generated by stepwise multiple regression indicated "decision of studying abroad" and "experiences of living abroad" could effectively predict the participants' intercultural sensitivity. 展开更多
关键词 intercultural sensitivity ISS (Intercultural Sensitivity Scale) cultural differences university of scienceand technology
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Technology Transfer as the Process of Pharmaceutical Quality System: Modelling Technology Transfer as a Process Strategy
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作者 Valeriy Nikityuk Eugene Shakin Tatiana Yamikh 《Journal of Pharmacy and Pharmacology》 2017年第6期299-313,共15页
The recent GMP (good medical practice) rules actualisation and its requirements introduction widened the GMP guidelines for every life cycle of medicinal products, including the stage of processes scaling and techno... The recent GMP (good medical practice) rules actualisation and its requirements introduction widened the GMP guidelines for every life cycle of medicinal products, including the stage of processes scaling and technology transfer. This requires the technology transfer process to be regulated as the part of pharmaceutical quality system and the following development of corresponding written procedures. The following publication is dedicated to the development of TTP (technology transfer process) and its accessible graphic formalisation alongside the definition of main stages and possible procedures limited by the offered model. According to the actualized GMP rules, the technology transfer is an essential part of pharmaceutical quality system at a modem pharmaceutical company. 展开更多
关键词 MEDICINE life cycle technology transfer process scaling pharmaceutical quality system quality system procedures.
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Promotion of Improved Sorghum Technologies through Large-Scale Demonstration in Gololcha Woreda, Arsi Zone of Oromia Regional State, Ethiopia
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作者 Hailemariam Solomon Fistum Miruts +1 位作者 Amare Seyoum Chalachew Endalamaw 《American Journal of Plant Sciences》 2021年第3期366-375,共10页
The study was carried out to improve farmers’ awareness, enhance the adoption of full package sorghum production technologies. The large-scale demonstration was implemented at Gololcha woreda of Arsi zone for one yea... The study was carried out to improve farmers’ awareness, enhance the adoption of full package sorghum production technologies. The large-scale demonstration was implemented at Gololcha woreda of Arsi zone for one year (2019/2020) using Melkam variety. The demonstration was implemented in three kebeles and a total of 100 hectares of land was covered by participating 117 household heads (farmers) out of which 12 of them were women-headed. In the demonstration farmers contributed a land size of 0.25 hectares (the minimum) and 2 hectares of land (maximum). Totally, from the demonstration 4030 quintals of sorghum were harvested with 42.3 quintals per hectare average productivity. The yield obtained by farmers practices w</span><span style="font-family:Verdana;">as</span><span style="font-family:Verdana;"> 18.23 q</span><span style="font-family:""><span style="font-family:Verdana;">&middot;ha</span><sup><span style="font-family:Verdana;">-1</span></sup><span style="font-family:Verdana;"> which is lower as compared to the average yield obtained by large scale demonstration. The technology gap (TG) was 15.70 q&middot;ha</span><sup><span style="font-family:Verdana;">-1</span></sup><span style="font-family:Verdana;"> which indicated that technologies have not been adopted. Extension gap was 24.07 q&middot;ha</span><sup><span style="font-family:Verdana;">-1</span></sup><span style="font-family:Verdana;"> and this result indicated that the extension approach should be </span></span><span style="font-family:Verdana;">more </span><span style="font-family:Verdana;">strengthen</span><span style="font-family:Verdana;">ed</span><span style="font-family:Verdana;">. It has been ascertained that </span><span style="font-family:Verdana;">“</span><span style="font-family:Verdana;">Melkam</span><span style="font-family:Verdana;">”</span><span style="font-family:Verdana;"> variety is the best fitted variety and promotion of improved sorghum technologies via large scale demonstration has show</span><span style="font-family:Verdana;">n</span><span style="font-family:Verdana;"> a considerable yield increment as compared to farmers practices. According to the farmers’ trait preference, Melkam variety was preferred by farmers because of its high yielding, consumption quality, early maturity, palatability, and drought-tolerant traits respectively. For sustainable production of improved sorghum technologies, the seed system should be taken into consideration to deliver the seed supply for the entire sorghum producers. 展开更多
关键词 DEMONSTRATION Extension Gap LARGE-SCALE SORGHUM technology Gap
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Design a Collector with More Reliability against Defects during Manufacturing in Nanometer Technology, QCA
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作者 Milad Sang Sefidi Dariush Abedi Mehdi Moradian 《Journal of Software Engineering and Applications》 2013年第6期304-312,共9页
Nowadays Quantum Cellular Automata (QCA) as the leading technology in design of microelectronic systems has been raised. With respect to high velocity and density in low power and also simple concepts, this technology... Nowadays Quantum Cellular Automata (QCA) as the leading technology in design of microelectronic systems has been raised. With respect to high velocity and density in low power and also simple concepts, this technology is a viable alternative to CMOS technology. In collector design, the primary component of each processor is very important. Due to the small elements in this technology, failure rate in manufacturing process technology is very high. In the other hand, the simulation shows that the intersection point of two wires is one of the critical points in QCA circuits. This means that defects in the manufacturing process around these points can cause malfunction in the circuit performance. In this paper, a collector in cross sections of wire in his new method used higher reliability against defects during manufacturing has been developed. QCA Designer software is used to simulate the case study system. 展开更多
关键词 COLLECTOR QUANTUM DOT Cells Fault Tolerance QUANTUM Cellular AUTOMATA NANO-SCALE technologies
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支撑新能源电力系统灵活性需求的用户侧资源应用与关键技术 被引量:5
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作者 吴林林 陈璨 +2 位作者 胡俊杰 王晨宇 童宇轩 《电网技术》 EI CSCD 北大核心 2024年第4期1435-1444,I0011,I0012-I0016,共16页
伴随着传统电力系统向以新能源为主体的新型电力系统转型升级,高比例新能源的接入和传统机组占比下降导致电力系统灵活性产生缺额。电动汽车、数据中心、P2X(power-to-X)等需求侧资源可以在多时间尺度为电力系统提供灵活性,是新型电力... 伴随着传统电力系统向以新能源为主体的新型电力系统转型升级,高比例新能源的接入和传统机组占比下降导致电力系统灵活性产生缺额。电动汽车、数据中心、P2X(power-to-X)等需求侧资源可以在多时间尺度为电力系统提供灵活性,是新型电力系统灵活性的重要组成部分。该文首先描述高比例新能源背景下输电网和配电网在不同时间尺度的灵活性需求,然后对比总结了典型需求侧资源的调节特性与应用实践,研究了需求侧资源在支撑高比例新能源输电网和配电网中运行、规划2个层面多时间尺度灵活性需求的应用场景。最后针对未来需求侧资源的研究重点,从聚合技术、电碳协同优化调控策略、可信调节能力量化和通信与信息交换标准等角度,对支撑新型电力系统需求侧资源应用的关键技术进行了总结与展望。 展开更多
关键词 新型电力系统 需求侧灵活性 多时间尺度 应用场景与技术
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制造发展的三个范式:制造发展规律的研究 被引量:3
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作者 房丰洲 赖敏 +11 位作者 王金石 吕鹏 于楠 罗熙淳 胡春光 陈远流 陈磊 邓辉 徐涛 康城玮 韩伟 冯俊元 《中国科学基金》 CSSCI CSCD 北大核心 2024年第1期159-171,共13页
基于对人类社会发展历史和科学技术发展内在规律的认识,本文详细分析了制造发展的三个范式,论证了原子及近原子尺度制造是制造范式III的核心使能技术。文章回顾了国内外各机构对原子级制造研发规划现状,指出我国目前处于原子级制造技术... 基于对人类社会发展历史和科学技术发展内在规律的认识,本文详细分析了制造发展的三个范式,论证了原子及近原子尺度制造是制造范式III的核心使能技术。文章回顾了国内外各机构对原子级制造研发规划现状,指出我国目前处于原子级制造技术发展的重要战略机遇期,并从设计、材料、加工和检测等角度分析了原子级制造的技术体系内涵;梳理了原子级表面制造、原子级结构制造、原子级测量与表征等领域的研究进展,呈现了当前具有原子级制造能力的部分代表性技术,包括原子级切削、原子级抛光、电化学加工、等离子体原子级加工技术、原子精准操控以及原子分辨测量与表征技术,并对原子级制造战略规划提出发展建议。 展开更多
关键词 制造技术发展趋势 制造范式 原子及近原子尺度制造 原子精度制造 原子级制造
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农业知识驱动服务技术革新综述与前沿 被引量:1
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作者 王元胜 吴华瑞 赵春江 《农业工程学报》 EI CAS CSCD 北大核心 2024年第7期1-16,共16页
农业知识驱动服务技术是指运用先进信息技术,科学、高效调配农业领域专业知识服务资源,为农业行业提供智能化知识服务的技术,在解决农业技术服务供需严重失衡等难点问题方面具有重要意义,日益成为支撑农业转型升级和高质量发展的重要引... 农业知识驱动服务技术是指运用先进信息技术,科学、高效调配农业领域专业知识服务资源,为农业行业提供智能化知识服务的技术,在解决农业技术服务供需严重失衡等难点问题方面具有重要意义,日益成为支撑农业转型升级和高质量发展的重要引擎,代表着核心研究方向,伴随着技术发展全过程。目前农业行业迫切需要解决的是知识供给严重不足、服务效率不高的问题。农业知识驱动服务技术经历较长时间发展,在知识高效匹配和精准供给方面取得了较大进步,特别是2022年11月以来ChatGPT这类技术的出现,充分展现了超大规模预训练模型在知识智能服务方面的巨大潜力,这也是农业知识驱动服务可以取得突破的关键所在,可以在这方面发挥重要作用。该文在分析农业知识驱动服务相关技术现状的基础上,展望了农业领域可行的知识驱动服务技术路径,预测农业领域知识服务大模型研发构建会呈现参数由少到多、算力由弱趋强、强化训练逐渐加深的特点得到快速发展应用,未来将在专业技术指导、农业“装备-信息-农艺”融合、农业信息系统平台服务总线等方面系统升级现有农业知识服务范式,多模态服务将得到系统融合加深,人机交互模式将向“人性化”方向进一步黏合增强,从而为农业智能化转型升级提供全新的技术支撑,引领农业知识服务从数据检索、语义匹配迈向生成式知识驱动模式转变。 展开更多
关键词 农业 技术服务 知识驱动 ChatGPT 超大规模预训练模型 新范式
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城市创新创业活力与新兴产业核心技术:空间极化、规模门槛与中介效应 被引量:4
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作者 刘承良 刘向杰 《中国软科学》 CSSCI CSCD 北大核心 2024年第3期212-224,共13页
城市新企业、新资本和新发明涌现是孕育新兴产业核心技术的活力源泉,对加快形成新质生产力具有重要意义。利用中国城市面板数据考察创新创业活力对新兴产业核心技术的影响及作用机制。研究发现:(1)城市创新创业活力显著促进新兴产业核... 城市新企业、新资本和新发明涌现是孕育新兴产业核心技术的活力源泉,对加快形成新质生产力具有重要意义。利用中国城市面板数据考察创新创业活力对新兴产业核心技术的影响及作用机制。研究发现:(1)城市创新创业活力显著促进新兴产业核心技术数量提升,在考虑一系列稳健性检验后结论仍然成立。(2)创新创业活力对新兴产业核心技术活动的影响存在“边际递增”的城市规模门槛特征,而对邻近城市产生显著的抑制作用,存在“马太效应”和“虹吸效应”。(3)城市创新创业活力对新兴产业核心技术活动的影响存在区域和梯度异质性,不同地理位置和文化区的城市存在显著差异,而资源型城市、智慧城市和创新型城市的分组回归体现了梯度性特征。(4)创新创业活力通过提升城市多样性,特别是专业化部门的多样性程度,促进新兴产业核心技术数量增长。 展开更多
关键词 新兴产业核心技术 新质生产力 创新创业活力 城市多样性 城市规模
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Techniques and Technological Aspects of Palm Oil (Elaeis guineensis) Processing in Cameroon
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作者 Godlove Nfor Njeshu Ngwa Martin Ngwabie +1 位作者 Divine Nde Bup Cornelius Tsamo 《World Journal of Engineering and Technology》 2023年第4期756-769,共14页
Crude palm Oil (CPO) processing is very popular in African Countries. In Cameroon, various actors are involved ranging from agro-industrial complexes to traditional processing by smallholders who use very inefficient ... Crude palm Oil (CPO) processing is very popular in African Countries. In Cameroon, various actors are involved ranging from agro-industrial complexes to traditional processing by smallholders who use very inefficient equipment and thus have low oil extraction rates. Small-scale processing by smallholders dates back to the early 1980s and has witnessed a lot of changes as a result of new actors in the sector, changing technologies and to an extent, government policies. This paper attempts a review of the origins and evolution of small-scale palm oil processing using intermediate technology, highlighting its importance to both the farmer and the national economy. An attempt is made to look into the future of this activity, with proposals for its consolidation. 展开更多
关键词 CPO Small-Scale Processing Oil Extraction Rates Intermediate technologies
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页岩气勘探开发实验技术研究进展与发展方向
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作者 何希鹏 蔡潇 +5 位作者 高玉巧 丁安徐 姜志高 何贵松 夏威 曾隽 《天然气工业》 EI CAS CSCD 北大核心 2024年第7期12-26,共15页
页岩气开发的成功得益于全新地质理论的建立及工程技术的进步,其中地质理论的创新离不开实验技术的突破与发展,但随着页岩气进入全面开发的新阶段,对实验方法、基础理论等方面提出了更高要求和技术挑战。为此,针对页岩气勘探开发过程中... 页岩气开发的成功得益于全新地质理论的建立及工程技术的进步,其中地质理论的创新离不开实验技术的突破与发展,但随着页岩气进入全面开发的新阶段,对实验方法、基础理论等方面提出了更高要求和技术挑战。为此,针对页岩气勘探开发过程中的关键问题,从页岩矿物组成、岩石物性、孔隙结构、含气性及可压性等5个方面展示了地质实验研究的进展和应用实例,分析了页岩气勘探开发实验研究面临的问题和挑战,并展望了其未来的发展方向和趋势。研究结果表明:①薄片鉴定和X射线衍射是页岩矿物分析最有效的定性定量方法,开展矿物成因实验研究对于揭示页岩成储规律及地质工程甜点段优选有着更重要的指导意义;②页岩物性测试方法多且标准不统一,需要根据研究目的选择适用的测试方法,开展地层条件下的物性测试对储量计算及开发效果评价更有帮助;③页岩孔隙结构表征已形成了从宏观到微观、从定性到定量、从二维到三维的综合评价方法,可指导开发层系划分和水平井靶窗优选;④页岩含气性评价已形成了现场含气量测试、等温吸附、气体碳同位素监测等实验方法,揭示了页岩气赋存状态和解吸规律,可有效指导气井生产制度制订和采收率提高;⑤页岩可压性评价已形成了X射线衍射、多尺度的裂缝网络刻画、三轴力学、差应变法、声波各向异性法及声发射法等实验方法,可指导水平井设计和压裂工艺优化。结论认为,建立跨尺度多方法深度融合的实验体系、加强原位条件下的页岩气储层评价、开展关键参数的动态演化和基于大数据模型的人工智能实验评价等是下一步研究方向,持续完善页岩气实验地质技术体系方可为页岩气高效勘探开发提供更好的理论基础和技术支撑。 展开更多
关键词 页岩气 实验地质技术 储层评价 跨尺度 人工智能 进展 展望
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