期刊文献+
共找到1,737篇文章
< 1 2 87 >
每页显示 20 50 100
Gap dynamics in the U.S.between urban areas in the current trend and in sustainable scenario
1
作者 Haoyu Wang Xiuyuan Zhang +6 位作者 Shihong Du Yuyu Zhou Donghai Wu Qian Wang Lubin Bai Bo Liu Shuping Xiong 《Geography and Sustainability》 2025年第1期143-158,共16页
The gap between the projected urban areas in the current trend(UAC)and those in the sustainable scenario(UAS)is a critical factor in understanding whether cities can fulfill the requirements of sustainable development... The gap between the projected urban areas in the current trend(UAC)and those in the sustainable scenario(UAS)is a critical factor in understanding whether cities can fulfill the requirements of sustainable development.However,there is a paucity of knowledge on this cutting-edge topic.Given the extensive and rapid urbanization in the United States(U.S.)over the past two centuries,accurately measuring this gap between UAS and UAC is of critical importance for advancing future sustainable urban development,as well as having significant global implications.This study finds that although the 740 U.S.cities have a large UAC in 2100,these cities will encom pass a significant gap from UAC to UAS(approximately 165,000 km2),accounting for 30%UAC at that time.The study also reveals the spatio-temporal heterogeneity of the gap.The gap initially increases before reaching a inflection point in 2090,and it disparates greatly from−100%to 240%at city level.While cities in the Northwestern U.S.maintain UAC that exceeds UAS from 2020 to 2100,cities in other regions shift from UAC that exceeds UAS to UAC that falls short of UAS.Filling the gap without additional urban growth planning could lead to a reduction of crop production ranging from 0.3%to 3%and a 0.68%loss of biomass.Hence,dynamic and forward-looking urban planning is essential for addressing the challenges of sustainable development posed by urbanization,both within the U.S.and globally. 展开更多
关键词 Urban areas in the current trend Urban areas in the sustainable scenario Urban gap dynamics Urban sustainability
在线阅读 下载PDF
Current Trends in Clinical Practice for the Minimal Invasive Medial Unicondylar Knee Arthroplasty
2
作者 Santosh Kumar Sah Arjun Sinkemani Yonggang Li 《Open Journal of Orthopedics》 2020年第9期252-267,共16页
<span style="font-family:""><span style="font-family:Verdana;">Unicondylar Knee Arthroplasty (UKA) is an early alternative surgical procedure for the unicondylar osteoarthritis or ... <span style="font-family:""><span style="font-family:Verdana;">Unicondylar Knee Arthroplasty (UKA) is an early alternative surgical procedure for the unicondylar osteoarthritis or damaged knee joint with artificial </span><span style="font-family:Verdana;">prosthesis for the release of disabling painful condition and restoring the</span><span style="font-family:Verdana;"> normal knee functions. Minimally UKA is one of the recent and the majority successful procedures in modern orthopedics for the osteoarthritis which is spreading throughout the worldwide. Recently, many orthopedic surgeons are expanding their abilities in this field. However, it needs good knowledge and well experience for the successful clinical outcomes. The minimal invasive approach is more efficient for short hospital stay and faster postoperative recovery with low morbidity of the patients after UKA. The aim of this article is to emphasize the steps in UKA based on modern facts: function of knee joint, diagnosis, less invasive approach for medial condylar replacement, radiographic evaluation, and earlier recovery, selecting the patient and implant survivorship with review of surgery. 展开更多
关键词 Unicondylar Knee Arthroplasty Minimal Invasive Knee Arthroplasty current trends of Unicompartmental Knee Arthroplasty
暂未订购
Current Trends of 2116 Science and Technology Program
3
《中国气象科学研究院年报》 1999年第0期46-46,共1页
关键词 current trends of 2116 Science and Technology Program
在线阅读 下载PDF
CURRENT TRENDS IN THE DEVELOPMENT OF THE CHINESE SOCIAL SECURITY SYSTEM FOR PEOPLE WITH DISABILITIES 被引量:1
4
作者 李静 黎建飞 《Frontiers of Law in China-Selected Publications from Chinese Universities》 2016年第1期4-20,共17页
Abstract The Law on the Protection of Disabled Persons is the first social security legislation in China, with more than 50 laws directly related to the legal protection of the rights of persons with disabilities and ... Abstract The Law on the Protection of Disabled Persons is the first social security legislation in China, with more than 50 laws directly related to the legal protection of the rights of persons with disabilities and career development for people with disabilities. In terms of employment protections for people with disabilities, it is important to focus on effective legal implementation, utilizing legal rulings to limit employment discrimination against people with disabilities. Educational protections are an important precondition for enabling people with disabilities to live with dignity; it should be guaranteed that people with disabilities are provided "reasonable accommodation" in educational conditions. A barrier-free environment is a necessary condition for social integration of people with disabilities. At the same time, it also benefits other members of the society such as the elderly. Through rehabilitation and exercise, most people with disabilities can return to the society to a significant degree. China should gradually expand the legislative scope of rehabilitation service fee reductions and legal categories of auxiliary appliances, issuing guiding documents that provide specifications for the relevant "dormant" legal provisions. 展开更多
关键词 people with disabilities social security law current trends China
原文传递
Current situation and trend of marine data buoy and monitoring network technology of China 被引量:14
5
作者 WANG Juncheng WANG Zhongqiu +2 位作者 WANG Yiming LIU Shixuan LI Yunzhou 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2016年第2期1-10,共10页
Marine data buoy can provide a long-term, continuous, real-time, reliable data of ocean observation in a variety of complex marine environment. It is one of the most reliable, most effective and important means of oce... Marine data buoy can provide a long-term, continuous, real-time, reliable data of ocean observation in a variety of complex marine environment. It is one of the most reliable, most effective and important means of ocean monitoring technology. In this paper, the classification, main theory and technology system of marine data buoy are summarized. The typical technological breakthrough of the development of marine data buoy in recent years is summarized. The composition and application of marine monitoring network in China was introduced, and the gap between the technology of China's marine data buoy and the international advanced countries is compared.Combined on the situation and demand of China's current situation and needs, the development trend of marine data buoy and buoy monitoring network are expected. 展开更多
关键词 marine monitoring buoy marine observation monitoring network current situation and trend
在线阅读 下载PDF
Current Japanese Social Trend of Thought and "Neo-natlonalism"
6
作者 Yang Bojiang Research Professor and Director at the Division for Northeast Asian Studies, China Institute of Contemporary International Relations. 《Contemporary International Relations》 2001年第5期1-13,共13页
"Like tidal waves, the social trend of thought comes from surging public thinking echoing each other in turbulence along the same direction as a result of changes in environment and national mood in a civilized c... "Like tidal waves, the social trend of thought comes from surging public thinking echoing each other in turbulence along the same direction as a result of changes in environment and national mood in a civilized country", wrote Liang Qichao (1873-1929), a Chinese scholar and one of the leaders of 展开更多
关键词 current Japanese Social trend of Thought and Neo-natlonalism
在线阅读 下载PDF
Current Status and Trends on NdFeB Magnetic Materials
7
《China Rare Earth Information》 2003年第3期1-4,共4页
关键词 NDFEB current Status and trends on NdFeB Magnetic Materials IS into on
在线阅读 下载PDF
A REVIEW OF THE CURRENT STATE AND DEVELOPMENT TREND OF GEOCRYOLOGY THROUGH THE VI ICOP
8
作者 Zhu Yuanlin and Cheng Guodong(State Key Laboratory of Frozen Soil Engineering under Lanzhou Institute of Glaciology & Cryopedology, CAS) 《Bulletin of the Chinese Academy of Sciences》 1995年第3期294-298,共5页
Based on the review of the papers and other related material submitted to the conference, the status quo and developmental trends of geocryology is briefly discussed.
关键词 IPA A REVIEW OF THE current STATE AND DEVELOPMENT trend OF GEOCRYOLOGY THROUGH THE VI ICOP VI
在线阅读 下载PDF
混凝土风力发电塔筒结构修复加固技术发展与展望
9
作者 何敏娟 肖羽飞 《特种结构》 2026年第1期33-38,共6页
随着风力发电技术的快速发展,风电机组的装机数量不断增加,混凝土风力发电塔因刚度大、经济性好,应用不断增多。然而,在建设和运行过程中,混凝土风电塔筒出现了若干质量问题,部分结构需进行修复加固。为便于工程技术人员比选修复加固方... 随着风力发电技术的快速发展,风电机组的装机数量不断增加,混凝土风力发电塔因刚度大、经济性好,应用不断增多。然而,在建设和运行过程中,混凝土风电塔筒出现了若干质量问题,部分结构需进行修复加固。为便于工程技术人员比选修复加固方案,本文对相关技术进行了系统综述。概述了混凝土风力发电塔筒的结构形式和缺陷损伤特点,梳理了其加固需求、修复加固技术及研究进展。展望了混凝土风电塔筒修复加固技术在智能化与数字化、机器人技术应用及可持续材料等方面的发展趋势,提出了在智能化检修、长期性能、抗火性能和可靠性等方面需解决的关键问题。 展开更多
关键词 风力发电塔 混凝土塔筒结构 修复加固 技术现状 发展展望
在线阅读 下载PDF
职业工效学发展历程、趋势及展望
10
作者 陈娜 谢唯 +4 位作者 赵佳佳 高慕瑀 贾乐乐 李静芸 张忠彬 《郑州大学学报(医学版)》 北大核心 2026年第1期1-6,共6页
本研究系统梳理了职业工效学的概念内涵与研究范畴,重点总结分析了国际职业工效学的发展历程、管理体系与实践成果,对比阐述了我国职业工效学学科建设、标准制定及在“健康中国行动”背景下的研究进展,提出职业工效学发展趋势和展望,为... 本研究系统梳理了职业工效学的概念内涵与研究范畴,重点总结分析了国际职业工效学的发展历程、管理体系与实践成果,对比阐述了我国职业工效学学科建设、标准制定及在“健康中国行动”背景下的研究进展,提出职业工效学发展趋势和展望,为构建适应中国国情的职业工效学体系、保障劳动者安全健康福祉提供参考。 展开更多
关键词 职业工效学 现状 发展趋势 健康中国行动
暂未订购
山林应急救援装备设计现状与趋势研究
11
作者 蒋歆瑶 马宏宇 《包装与设计》 2026年第1期134-135,共2页
目的系统梳理国内山林应急救援装备设计现状,提出此类装备设计的未来研究方向与发展趋势。方法首先,对山林应急救援装备进行概述;其次,通过关键词聚类与关键词突现,分析应急救援装备研究热点的结构分布与动态演进趋势;最后,通过案例分析... 目的系统梳理国内山林应急救援装备设计现状,提出此类装备设计的未来研究方向与发展趋势。方法首先,对山林应急救援装备进行概述;其次,通过关键词聚类与关键词突现,分析应急救援装备研究热点的结构分布与动态演进趋势;最后,通过案例分析,梳理山林应急救援装备设计的未来发展趋势。结果对山林应急救援装备设计现状与未来发展趋势展开了较为全面的探讨。结论研究可为相关领域的产品研发与创新实践提供理论参考与实践指导。 展开更多
关键词 山林应急救援 装备设计 现状与趋势
原文传递
锂离子电池储能系统消防安全技术研究进展
12
作者 余威 《消防科学与技术》 北大核心 2026年第1期64-74,共11页
锂离子电池储能作为新型储能的核心技术,在推动能源转型和实现“双碳”目标中具有战略意义。然而,随着装机容量的快速增长,储能系统火灾安全问题日益突出,严重制约产业健康发展。本文系统分析了全球典型储能火灾事故案例,总结事故特征... 锂离子电池储能作为新型储能的核心技术,在推动能源转型和实现“双碳”目标中具有战略意义。然而,随着装机容量的快速增长,储能系统火灾安全问题日益突出,严重制约产业健康发展。本文系统分析了全球典型储能火灾事故案例,总结事故特征与致灾机理;从本质安全、热失控机理、监测预警和灭火抑爆4个维度,全面梳理了储能安全技术研究现状与发展趋势。在本质安全方面,固态电池技术和材料体系改性研究持续推进;热失控机理研究已从单一特征分析发展到多物理场耦合和跨尺度预测研究;监测预警技术正向多参数融合和智能诊断方向演进;灭火技术从单一灭火剂转向协同策略与精准防控。研究表明,未来储能消防安全技术将朝着本质安全根基化、机理研究系统化、预警诊断智能化和灭火防控精准化的方向协同发展,为构建高安全性的储能系统提供技术支撑。 展开更多
关键词 储能系统 锂离子电池 消防安全 技术现状 趋势
在线阅读 下载PDF
浅谈果酒的现状及发展趋势
13
作者 殷小燕 杨高明 《酿酒》 2026年第1期23-26,共4页
本文旨在探讨果酒发展的现状、面临的问题及其未来发展趋势。通过果酒分类、营养价值及市场分析和行业观察,文章详细阐述了果酒市场变化、竞争格局、消费者需求以及主要发展动向,为果酒行业和研究者提供了有益的参考。
关键词 果酒 现状 发展趋势
在线阅读 下载PDF
储能电池新技术发展现状及未来趋势
14
作者 冯宇 耿世举 +1 位作者 张焱 王培阳 《水电与新能源》 2026年第1期6-9,共4页
储能技术是构建新型电力系统的关键支撑,在能源转型中具有不可替代的战略地位。基于电化学储能技术基本原理,探讨了锂离子电池、钠离子电池、固态/半固态电池、全钒液流电池等技术路径和进展,分析了储能系统集成与智能化技术现状,指出... 储能技术是构建新型电力系统的关键支撑,在能源转型中具有不可替代的战略地位。基于电化学储能技术基本原理,探讨了锂离子电池、钠离子电池、固态/半固态电池、全钒液流电池等技术路径和进展,分析了储能系统集成与智能化技术现状,指出储能电池技术将朝着大容量、长周期、混合化、智能化方向发展,预计到2030年,装机量将超过2.4亿kW。建议加强技术创新,完善政策体系,以推动储能产业实现高质量发展。 展开更多
关键词 储能电池 新技术 发展现状 未来趋势 智能化
在线阅读 下载PDF
Low-frequency variability of the North Equatorial Current bifurcation in the past 40 years from SODA 被引量:3
15
作者 MENG Qingji WANG Fan LIU Na 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2011年第3期14-19,共6页
The low-frequency variability of the North Equatorial Current (NEC) bifurcation during 1958 to 2001 was investigated with the Simple Ocean Data Assimilation (SODA) 2.0.2 dataset. In agreement with recent observati... The low-frequency variability of the North Equatorial Current (NEC) bifurcation during 1958 to 2001 was investigated with the Simple Ocean Data Assimilation (SODA) 2.0.2 dataset. In agreement with recent observations, the NEC bifurcation latitude (NBL) shifted northward as depth increases, from about 12.7°N near the surface to about 17.1°N at depths around 500 m for the annual average. This study reveals that the interannual variations of NBL, with five years period, mainly focused on the upper 500 m with amplitude increasing as depth increased. The NBL shifted southward in the past 40 years, which was more significant in the subsurface at more than -0.02°/a. The NBL manifests itself in the transports of NMK (NEC-Mindanao Current (MC)-Kuroshio) system in strong relationship with MC (0.7) and Kuroshio (-0.7). The EOF analysis of meridional velocity off the Philippine coast shows that the first mode, explaining 62% of variance and 5 years period, was highly correlated with the southward shift of NBL with coefficient at about 0.75. The southward shift of NBL consists with the weakening of MC and strengthening of Kuroshio, which exhibited linear trends at -0.24Sv/a and 0.11Sv/a. Both interannual variation and trend of NBL were closely related to the variation of NMK system. 展开更多
关键词 North Equatorial current bifurcation latitude interannual variation linear trend NEC-Mindanao current-Kuroshio system
在线阅读 下载PDF
近二十年(2004-2024)我国数学素养研究的现状趋势、热点主题与未来展望——基于CNKI数据库的CiteSpace知识图谱可视化分析 被引量:1
16
作者 徐新爱 孙庆括 潘腾 《教育学术月刊》 北大核心 2025年第6期103-111,共9页
数学素养是数学课程改革的重要目标,其研究趋势关乎课程实施的深入推进。采用CiteSpace可视化知识图谱技术,从发文数量、作者合作网络及关键词频次等维度,深入剖析近二十年(2004-2024)我国数学素养研究领域的现状趋势、热点主题。研究表... 数学素养是数学课程改革的重要目标,其研究趋势关乎课程实施的深入推进。采用CiteSpace可视化知识图谱技术,从发文数量、作者合作网络及关键词频次等维度,深入剖析近二十年(2004-2024)我国数学素养研究领域的现状趋势、热点主题。研究表明,数学素养与数学课程改革的深度融合是突出的研究特色;研究热点主题涵盖数学素养的理论内涵、实践途径以及培养策略等三大方面;数学核心素养将成为未来数学素养研究的重点领域。未来应加强数学素养的跨学科研究、建立数学素养的评价体系,并进一步加强数学素养的实践路径转化,以推动我国数学素养研究的持续深入。 展开更多
关键词 数学素养 课程改革 现状趋势 热点主题
原文传递
小区育种田间试验关键技术装备研究现状与趋势 被引量:2
17
作者 徐涛 朱炫铭 +3 位作者 梁玉成 芦磊 刘春旭 徐东 《农机化研究》 北大核心 2025年第12期283-293,共11页
小区育种专用播种机和收获机是育种田间试验的关键机械装备,其作业精度和质量直接影响到育种过程的准确性、真实性和科学性。本文综述了国内外小区育种播种和收获技术装备的研究应用历程、发展水平与现状;总结了小区供种、排种、清种精... 小区育种专用播种机和收获机是育种田间试验的关键机械装备,其作业精度和质量直接影响到育种过程的准确性、真实性和科学性。本文综述了国内外小区育种播种和收获技术装备的研究应用历程、发展水平与现状;总结了小区供种、排种、清种精量播种机械和小区高净无混低损收获装备的主要技术特点;详述了国内外小区播种机供种、排种、清种和小区收获机脱粒、清选、除杂等核心工作部件的结构和原理;介绍了步进电机驱动与编码器信号反馈闭环精准排种、基于激光反射式检测原理的全自动供种和收获阶段实时采集记录测定分析数据等方面的实际应用效果,以及先进技术研究现状和趋势;指出了我国在小区播种与收获技术装备研发方面的存在的问题。同时,针对国产现有主要机型基本结构和技术特点进行分析,着力解决技术研学创新优化、智能化控制水平提高、机械加工质量提升和农机农艺深度融合提质等方面的技术短板,指出了小区育种播种机和小区收获机的研发方向。 展开更多
关键词 育种试验 小区播种机 小区收获机 研究现状 发展趋势
在线阅读 下载PDF
Preliminary Discussion on the Development Status and Trend of Urban Landscape Architecture Design
18
作者 LI Chunhui 《外文科技期刊数据库(文摘版)工程技术》 2021年第8期442-445,共6页
Urban landscape engineering plays an important role in promoting regional sustainable development. With the shrinking of land resources, in order to fundamentally improve the comprehensive efficiency in the process of... Urban landscape engineering plays an important role in promoting regional sustainable development. With the shrinking of land resources, in order to fundamentally improve the comprehensive efficiency in the process of landscape engineering construction, it is necessary to carefully analyze the problems existing in the landscape engineering design work, and constantly improve the actual design scheme in combination with the actual construction characteristics and requirements of the project, so as to ensure the construction efficiency and construction cost of the later landscape engineering. Next, the article discusses the development status and trend of urban landscape design. 展开更多
关键词 landscape architecture design development current situation and trend
原文传递
Research on the Current Situation of China’s Higher Education Students Studying Abroad in the Context of Higher Education Internationalization
19
作者 Yuxian Jin 《Journal of Contemporary Educational Research》 2024年第1期127-132,共6页
In the context of education internationalization,the internationalization of higher education has become a major trend in the field of education in most countries,with international student education as the core.This ... In the context of education internationalization,the internationalization of higher education has become a major trend in the field of education in most countries,with international student education as the core.This phenomenon promotes cultural exchanges and integration among countries as well as higher education reform,which is of great significance in enhancing the international influence of higher education in each country.However,there are also some challenges faced by higher education students when studying abroad.The article digs into the origin and history of studying abroad,analyzes the current situation and reasons for higher education students in China to study abroad,discusses the opportunities and challenges faced by higher education students in China when studying abroad,and analyzes the trend of studying abroad in China. 展开更多
关键词 Internationalization of higher education International students Study abroad current situation and development trend
在线阅读 下载PDF
The Present Situation and Trend of Development of China's Legislative Disclosure System
20
作者 季长龙 OU Xiaoqi 《The Journal of Human Rights》 2016年第2期117-131,共15页
The legislative disclosure system is one of the important parts of the amendment of the Legislation Law in 2015. This shows that the role of the legislative disclosure system in improving the quality of legislation is... The legislative disclosure system is one of the important parts of the amendment of the Legislation Law in 2015. This shows that the role of the legislative disclosure system in improving the quality of legislation is catching more and more attention. Apart from the Legislation Law, local regulations of provinces and municipalities have also made a positive contribution to the perfection of the legislative disclosure system, leading the Legislation Law in many specific processes and specific measures, and playing the role of legislative exploration and experimentation. To summarize the new development of the legislative disclosure system on the part of the Legislation Law and local legislative practice is of important theoretical and practical value for promoting the continued maturity and improvement of this important legislative system. 展开更多
关键词 Legislative Disclosure Value Target current Situation trend of Development
原文传递
上一页 1 2 87 下一页 到第
使用帮助 返回顶部