期刊文献+

二次检索

题名
关键词
文摘
作者
第一作者
机构
刊名
分类号
参考文献
作者简介
基金资助
栏目信息
共找到31篇文章
< 1 2 >
每页显示 20 50 100
GISS海气耦合模式的基本气候态评估 被引量:3
1
作者 周波涛 何金海 +1 位作者 陈隆勋 赵平 《应用气象学报》 CSCD 北大核心 2004年第4期500-505,共6页
该文简单介绍了GISS海气耦合模式 ,并且利用该模式进行数值模拟 ,以此来判断其模拟能力 ,尤其是对亚洲地区的模拟。结果表明 :该模式模拟的亚洲地区大气和海洋的气候状况比较接近实况 ,具有一定的气候模拟能力。同时 ,由于其较粗的分辨... 该文简单介绍了GISS海气耦合模式 ,并且利用该模式进行数值模拟 ,以此来判断其模拟能力 ,尤其是对亚洲地区的模拟。结果表明 :该模式模拟的亚洲地区大气和海洋的气候状况比较接近实况 ,具有一定的气候模拟能力。同时 ,由于其较粗的分辨率 ,对计算机要求不高 ,容易利用目前国内中小型计算机进行长期运转 ,是一个简易的数值模拟工具。文章也讨论了该模式模拟的不足之处 ,如亚洲地区模拟的地面气温偏低 ,海温略偏高 ,青藏高原南部夏季降水过大 。 展开更多
关键词 海气耦合模式 大气环流模式 海洋环流模式 giss
下载PDF
全球平均温度序列的比较 被引量:18
2
作者 唐国利 王绍武 +1 位作者 闻新宇 黄建斌 《气候变化研究进展》 CSCD 2011年第2期85-89,共5页
着重评述了目前国际上常用的3个全球平均温度序列:HadCRUT3、NCDC及GISS。后两个序列1982年之后引入了卫星观测资料。NCDC对资料作了插补,建立了1880—2009年覆盖面完整的序列。HadCRUT3序列所显示的近10年变暖的停滞可能主要是缺少极... 着重评述了目前国际上常用的3个全球平均温度序列:HadCRUT3、NCDC及GISS。后两个序列1982年之后引入了卫星观测资料。NCDC对资料作了插补,建立了1880—2009年覆盖面完整的序列。HadCRUT3序列所显示的近10年变暖的停滞可能主要是缺少极区资料造成的。NCDC与GISS两个序列依然保持约0.1℃/10a的增温。3个序列1910—2009年的变暖趋势十分接近,在0.70~0.75℃/100a之间。 展开更多
关键词 全球平均 温度 HadCRUT3 NCDC giss
下载PDF
21世纪气候变暖并未停滞 被引量:11
3
作者 王绍武 罗勇 +2 位作者 赵宗慈 闻新宇 黄建斌 《气候变化研究进展》 CSCD 北大核心 2013年第5期386-387,共2页
现在全球气候变暖的观点,逐渐得到了愈来愈多的科学家、公众乃至政府机构的认同[1-2].但是,从20世纪末至今,部分学者对于气候变暖这个议题依然存在争议.最近一轮争议的焦点是21世纪以来变暖是否停滞[3-4].因此,提供最新的数据,论证进入2... 现在全球气候变暖的观点,逐渐得到了愈来愈多的科学家、公众乃至政府机构的认同[1-2].但是,从20世纪末至今,部分学者对于气候变暖这个议题依然存在争议.最近一轮争议的焦点是21世纪以来变暖是否停滞[3-4].因此,提供最新的数据,论证进入21世纪以来变暖是否停滞仍然有重要的意义. 展开更多
关键词 气候变暖 自然因子 温度序列 giss
下载PDF
地理信息系统外壳开发的理论与实践 被引量:4
4
作者 王晓栋 《中国图象图形学报(A辑)》 CSCD 1998年第1期44-48,共5页
在分析面向工程的地理信息系统传统开发模式的基础上,提出了地理信息系统外壳(GISS:GeographicInformationSystemShel)的开发模式并讨论了GISS的特点,结合地理信息查询外壳(GIQS:G... 在分析面向工程的地理信息系统传统开发模式的基础上,提出了地理信息系统外壳(GISS:GeographicInformationSystemShel)的开发模式并讨论了GISS的特点,结合地理信息查询外壳(GIQS:GeographicInforma-tionQueryShel)的实现,阐述了开发GISS的理论方法和技术路线。 展开更多
关键词 面向工程 地理信息系统 giss
下载PDF
地理信息查询外壳的设计 被引量:2
5
作者 王晓栋 《遥感技术与应用》 CSCD 1997年第3期35-41,共7页
在分析应用型地理信息系统传统开发模式的基础上,提出了地理信息系统外壳(GISS:GeographicalInformationSystemShel)的开发模式。然后详细介绍了以GISS思想为指导的地理信息查询外壳(G... 在分析应用型地理信息系统传统开发模式的基础上,提出了地理信息系统外壳(GISS:GeographicalInformationSystemShel)的开发模式。然后详细介绍了以GISS思想为指导的地理信息查询外壳(GIQS:GeographicalInformationQueryShel)的实现,包括系统结构、文件类型、分类编码方案和双向多功能查询的实现。GIQS的索引机制和压缩树形折半查找方法大大提高了操作效率。 展开更多
关键词 地理信息系统外壳(giss) 地理信息查询外壳(GIQS) 双向多功能查询 压缩树形折半查找
下载PDF
初生相形态对半固态挤压铸造Al-Si-Mg-Fe合金力学性能的影响
6
作者 张占领 张艳琴 《铸造》 CAS CSCD 北大核心 2017年第6期582-585,共4页
采用气泡搅拌制备铸造铝硅镁合金半固态浆料(GISS)工艺,可以开发出具有细小均匀的球状晶体结构的半固态浆料。本文以轮毂铸件为例,研究通过带气孔的石墨头释放出细小惰性气体气泡,气泡在熔体内部引起强烈对流,使得热量可以迅速散失从而... 采用气泡搅拌制备铸造铝硅镁合金半固态浆料(GISS)工艺,可以开发出具有细小均匀的球状晶体结构的半固态浆料。本文以轮毂铸件为例,研究通过带气孔的石墨头释放出细小惰性气体气泡,气泡在熔体内部引起强烈对流,使得热量可以迅速散失从而加快冷却速度;同时也使得熔体中的温度场更加均匀,抑制枝晶形成,得到细小的球状晶粒。通过改变吹气量、吹气时间以及石墨头表面积,即可获得不同固相率的浆料,最后采用挤压铸造工艺生产出合格铸件。结果表明,初生α(Al)的形状和粒径大小对铸件的拉伸强度和伸长率有很大的影响。 展开更多
关键词 giss 轮毂 显微组织 力学性能 挤压铸造
下载PDF
GIS应用中几个常见问题的处理
7
作者 施一军 储征伟 《现代测绘》 2002年第S1期167-170,共2页
数字城市的建立中对GIS的应用是一项复杂的的工程,本文结合在GIS应用的实践,对在GIS应用中的一些常见问题的处理的阐述,为不同用户对GIS的应用起到抛砖引玉的作用。
关键词 数字城市 giss应用 地理数据库 数据共享 海量数据
下载PDF
汶川抗震救灾的基础地理信息综合应急服务 被引量:7
8
作者 陈军 何超英 +2 位作者 朱武 彭震中 金舒平 《地理信息世界》 2008年第6期7-11,共5页
在5.12汶川特大地震抗震救灾中,国家测绘部门设计和组织实施了以数据成果服务、专用系统服务和专题制图服务为核心的基础地理信息综合应急服务。其是针对汶川震区地形特点和抗震救灾主体工作需求,快速整合和提供震区已有的基础测绘成果... 在5.12汶川特大地震抗震救灾中,国家测绘部门设计和组织实施了以数据成果服务、专用系统服务和专题制图服务为核心的基础地理信息综合应急服务。其是针对汶川震区地形特点和抗震救灾主体工作需求,快速整合和提供震区已有的基础测绘成果和最新遥感影像资料;快速搭建集震区海量数据集成管理为一体并具备3维影像浏览、对比分析等功能的专用地理信息系统,为灾情评估分析和重建规划研究提供地理空间数据集成展示和分析平台;应需地制作反映受灾范围、受灾程度、救灾响应、规划思路等的各类专题地图和地图集,有效地表达地震灾害的时空分布、重建规划布局等。 展开更多
关键词 汶川地震 地理信息服务 数据成果 专用系统 专题制图
下载PDF
Industrial development of gas induced semi-solid process 被引量:10
9
作者 S.THANABUMRUNGKUL S.JANUDOM +2 位作者 R.BURAPA P.DULYAPRAPHANT J.WANNASIN 《中国有色金属学会会刊:英文版》 CSCD 2010年第S3期1016-1021,共6页
The gas induced semi-solid(GISS) is a rheocasting process that produces semi-solid slurry by applying fine gas bubble injection through a graphite diffuser.The process is developed to be used in the die casting indust... The gas induced semi-solid(GISS) is a rheocasting process that produces semi-solid slurry by applying fine gas bubble injection through a graphite diffuser.The process is developed to be used in the die casting industry.To apply the GISS process with a die casting process,a GISS maker unit is designed and attached to a conventional die casting machine with little modifications.The commercial parts are developed and produced by the GISS die casting process.The GISS die casting shows the feasibility to produce industrial parts with aluminum 7075 and A356 with lower porosity than liquid die casting. 展开更多
关键词 GAS induced semi-solid(giss) RHEOCASTING DIE CASTING SEMI-SOLID metal INDUSTRIAL applications
下载PDF
Feasibility of semi-solid die casting of ADC12 aluminum alloy 被引量:9
10
作者 S.JANUDOM T.RATTANOCHAIKUL +2 位作者 R.BURA PA S.WISUTMETHANGOON J.WANNASIN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2010年第9期1756-1762,共7页
The feasibility of semi-solid die casting of ADC12 aluminum alloy was studied. The effects of plunger speed, gate thickness, and solid fraction of the slurry on the defects were determined. The defects investigated ar... The feasibility of semi-solid die casting of ADC12 aluminum alloy was studied. The effects of plunger speed, gate thickness, and solid fraction of the slurry on the defects were determined. The defects investigated are gas and shrinkage porosity. In the experiments, semi-solid slurry was prepared by the gas-induced semi-solid (GISS) technique. Then, the slurry was transferred to the shot sleeve and injected into the die. The die and shot sleeve temperatures were kept at 180 ℃ and 250 ℃, respectively. The results show that the samples produced by the GISS die casting give little porosity, no blister and uniform microstructure. From all the results, it can be concluded that the GISS process is feasible to apply in the ADC12 aluminum die casting process. In addition, the GISS process can give improved properties such as decreased porosity and increased microstructure uniformity. 展开更多
关键词 ADC12 aluminum alloys semi-solid die casting gas induced semi-solid giss RHEOCASTING
下载PDF
Evolution of microstructure in semi-solid slurries of rheocast aluminum alloy 被引量:11
11
作者 R.CANYOOK S.PETSUT +2 位作者 S.WISUTMETHA NGOON M.C.FLEMINGS J.WANNASIN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2010年第9期1649-1655,共7页
Semi-solid metal processing is being developed in die casting applications to give several cost benefits. To efficiently apply this emerging technology, it is important to understand the evolution of microstructure in... Semi-solid metal processing is being developed in die casting applications to give several cost benefits. To efficiently apply this emerging technology, it is important to understand the evolution of microstructure in semi-solid slurries for the control of the theological behavior in semi-solid state. An experimental apparatus was developed which can capture the grain structure at different times at early stages to understand how the semi-solid structure evolves. In this technique, semi-solid slurry was produced by injecting fine gas bubbles into the melt through a graphite diffuser during solidification. Then, a copper quenching mold was used to draw some semi-solid slurry into a thin channel. The semi-solid slurry was then rapidly frozen in the channel giving the microstructure of the slurry at the desired time. Samples of semi-solid 356 aluminum alloy were taken at different gas injection times of 1, 5, 10, 15, 20, 30, 35, 40, and 45 s. Analysis of the microstructure suggests that the fragmentation by remelting mechanism should be responsible for the formation of globular structure in this rheocasting process. 展开更多
关键词 microstructure evolution RHEOCASTING rapid quenching method 356 aluminum alloy gas induced semi-solid giss formation mechanism
下载PDF
Effects of primary phase morphology on mechanical properties of Al-Si-Mg-Fe alloy in semi-solid slurry casting process 被引量:3
12
作者 R.BURAPA S.JANUDOM +2 位作者 T.CHUCHEEP R.CANYOOK J.WANNASIN 《中国有色金属学会会刊:英文版》 CSCD 2010年第S3期857-861,共5页
The gas induced semi-solid(GISS) process was developed to create semi-solid slurry with fine and uniform globular structure.The combination of local rapid heat extraction and vigorous agitation by the injection of fin... The gas induced semi-solid(GISS) process was developed to create semi-solid slurry with fine and uniform globular structure.The combination of local rapid heat extraction and vigorous agitation by the injection of fine inert gas bubbles through a graphite diffuser in molten metal held at a temperature above its liquidus temperature changes the morphology of primary α(Al) from coarse dendritic to rosette-like and finally to fine globular.The GISS process produced semi-solid slurry at low solid fractions and then formed the slurry by a squeeze casting process to produce casting parts.The effects of primary phase morphology on the mechanical properties of Al-Si-Mg-Fe alloy were investigated.The results show that the ultimate tensile strength and elongation are affected by the shape factor and particle size of the primary α(Al). 展开更多
关键词 gas induced semi-solid(giss) microstructure MECHANICAL properties SEMI-SOLID SLURRY casting RHEOCASTING
下载PDF
Development of aluminum rheo-extrusion process using semi-solid slurry at low solid fraction 被引量:2
13
作者 T.RATTANOCHAIKUL S.JANUDOM +1 位作者 N.MEMONGKOL J.WANNASIN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2010年第9期1763-1768,共6页
An aluminum extrusion process is mainly used to fabricate long tubes, beams and rods for various applications. However, this process has a high production cost due to the need for investment of high-pressure machinery... An aluminum extrusion process is mainly used to fabricate long tubes, beams and rods for various applications. However, this process has a high production cost due to the need for investment of high-pressure machinery. The objective of this work is to develop a new semi-solid extrusion process using semi-solid slurry at low solid fractions. A laboratory extrusion system was used to fabricate aluminum rods with the diameter of 12 ram. The semi-solid metal process used in this study was the gas induced semi-solid (GISS) technique. To study the feasibility of the GISS extrusion process, the effects of extrusion parameters such as plunger speed and solid fi-action on the extrudability, microstructure, and mechanical properties of extruded samples were investigated. The results show that the plunger speed and solid fraction of the semi-solid metal need to be carefully controlled to produce complete extruded parts. 展开更多
关键词 aluminum alloys EXTRUSION semi-solid metal rheo-extrusion gas induced semi-solid giss
下载PDF
Improved sea-ice radiative processes in a global coupled climate model 被引量:1
14
作者 LIU Jiping ZHANG Zhanhai WU Huiding 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2005年第6期68-79,共12页
The NASA Goddard Institute for Space Studies (GISS) coupled global climatemodel was used to investigate the sensitivity of sea ice to improved representations of sea-iceradiative processes: (1) a more sophisticated su... The NASA Goddard Institute for Space Studies (GISS) coupled global climatemodel was used to investigate the sensitivity of sea ice to improved representations of sea-iceradiative processes: (1) a more sophisticated surface albedo scheme and (2) the penetration of solarradiation in sea ice. The results show that the large-scale sea-ice conditions are very sensitiveto the aforementioned parameteriza-tions. Although the more sophisticated surface albedo schemeproduces a more realistic seasonal cycle of the surface albedo as compared with the baselinesimulation, the resulting higher albedo relative to the baseline simulation generates much more andthicker ice in the arctic. The penetration of solar radiation in sea-ice itself tends to reduce theice cover and thickness in the entire arctic and the western antarctic, and increase the ice coverand thickness in the eastern antarctic. The combination of (1) and (2) significantly improves thesimulations of the average ice thickness and its spatial distribution in the arctic. The atmosphericresponses associated with sea-ice changes were also discussed. While improvements are seen,particularly of the ice thickness distribution, there are still some unrealistic aspects that willrequire further improvements to the sea-ice component. 展开更多
关键词 sea ice giss coupled model surface albedo penetration of solar radiation arctic and antarctic
下载PDF
《文苑外史》中"列车"的含义 被引量:2
15
作者 殷企平 《解放军外国语学院学报》 北大核心 2003年第1期82-85,共4页
《文苑外史》中三次出现的列车构成了小说的"节奏"。它不仅含义丰富,而且画龙点睛般地烘托出了小说结构的两根基本线条:利欲熏心且才疏学浅的贾斯珀等人搭上了时代快车,而心地善良且满腹珠玑的雷尔登等人却遭到了时代的抛弃... 《文苑外史》中三次出现的列车构成了小说的"节奏"。它不仅含义丰富,而且画龙点睛般地烘托出了小说结构的两根基本线条:利欲熏心且才疏学浅的贾斯珀等人搭上了时代快车,而心地善良且满腹珠玑的雷尔登等人却遭到了时代的抛弃。这两条主线在形式上平行发展,造成了一种对称的艺术美,而在内容色调上却形成了强烈的反差,使人更深切地感受到了那个社会的不公和价值观的混乱。 展开更多
关键词 文苑外史 乔治·吉辛 列车 含义
下载PDF
文学与市场——乔治·吉辛的城市观念与文化想象 被引量:1
16
作者 陈晓兰 《上海大学学报(社会科学版)》 CSSCI 北大核心 2012年第5期90-97,共8页
当代中国的都市化进程重演了一百多年前英国所遭遇的众多问题,在这个意义上说,英国人的现代经验既是英国的,同时也是我们自身的组成部分。在当代中国的语境中重读维多利亚晚期重要的城市小说家乔治·吉辛,会使我们跳出以往资本主义... 当代中国的都市化进程重演了一百多年前英国所遭遇的众多问题,在这个意义上说,英国人的现代经验既是英国的,同时也是我们自身的组成部分。在当代中国的语境中重读维多利亚晚期重要的城市小说家乔治·吉辛,会使我们跳出以往资本主义与社会主义意识形态的分野,发现许多跨越政治文化的共同经验。诸如中下层阶级的崛起对于文学、文化状况的影响,经济压迫与男性气的衰落,创作性艺术家的沦落和艺术的商品化等等。具有强烈精英意识的乔治·吉辛以古典人文主义思想为基点,揭示了文学的市场化对于文学、学术乃至文化和文明的负面影响。在他看来:现代城市毁坏了哲学、艺术和文学存在的条件,而这正是整个社会乃至文明向粗鄙和平庸退化的表征。 展开更多
关键词 乔治·吉辛 文学与市场 城市观念 文化想象
下载PDF
《四季随笔》中的生态焦虑 被引量:1
17
作者 应璎 《杭州师范大学学报(社会科学版)》 CSSCI 北大核心 2013年第2期123-127,共5页
乔治·吉辛的《四季随笔》是英国散文中的珍品,但是批评家大都认为作品中充满了逃避现实和回归过去的消极心态。如果我们从生态批评的视角去审视《四季随笔》,就会发现该作品远非如此消极。作为英国文化批评传统"过渡期"(... 乔治·吉辛的《四季随笔》是英国散文中的珍品,但是批评家大都认为作品中充满了逃避现实和回归过去的消极心态。如果我们从生态批评的视角去审视《四季随笔》,就会发现该作品远非如此消极。作为英国文化批评传统"过渡期"(1880-1914)的一部作品,《四季随笔》中表现出了深切的生态焦虑。这种焦虑不但继承了卡莱尔等人所表达的文化焦虑,更深化了这一文化批评传统,并且在奥威尔等后人的作品中得以延续。 展开更多
关键词 乔治·吉辛 《四季随笔》 英国文化批评 生态批评
下载PDF
在憎恶与同情之间——论乔治·吉辛的贫民小说 被引量:2
18
作者 应璎 《杭州电子科技大学学报(社会科学版)》 2012年第1期37-41,共5页
一直以来,批评家普遍认为乔治·吉辛的贫民小说反映出他对穷人的憎恶态度。然而,通过仔细分析贫民小说中的代表人物,就会发现吉辛憎恶穷人一说未免过于绝对。吉辛在小说中塑造了多种类型的穷人形象,对他们的态度也是复杂的:或憎恶... 一直以来,批评家普遍认为乔治·吉辛的贫民小说反映出他对穷人的憎恶态度。然而,通过仔细分析贫民小说中的代表人物,就会发现吉辛憎恶穷人一说未免过于绝对。吉辛在小说中塑造了多种类型的穷人形象,对他们的态度也是复杂的:或憎恶、或同情,甚至是尊敬。 展开更多
关键词 乔治·吉辛 贫民小说 穷人 态度
下载PDF
A Sightseeing Planning Support System with Gamification 被引量:1
19
作者 Yuro Koga Kayoko Yamamoto 《Journal of Geographic Information System》 2021年第4期485-507,共23页
In recent years, as there has been a major change in the necessity and importance of sightseeing information, a platform to provide real-time sightseeing information according to the ever-changing circumstances is nec... In recent years, as there has been a major change in the necessity and importance of sightseeing information, a platform to provide real-time sightseeing information according to the ever-changing circumstances is necessary. Additionally, it is effective to adopt gamification to increase users’ motivation to continuously utilize the system in order to provide them with more information. In the present study, in order to support users’ enjoyment in creating efficient and pleasant sightseeing plans, the system that incorporates gamification to increase motivation was developed combining with web-geographic information systems (Web-GIS) and sightseeing planning and sharing system. The system was operated over a period of 2 weeks in Chofu City, Tokyo Metropolis, Japan. Based on the results of a questionnaire survey for 51 users, though the operability of the 3 main functions incorporated with motivation by gamification was rated lower than those of the 2 basic functions, their usefulness was highly rated. Based on the results of the access log analysis, it was effective to design the system so that the same functions can be used regardless of the type of information terminal. Additionally, it was evident that the continuous utilization of the system could increase the number of sightseeing plans created by the users. 展开更多
关键词 Sightseeing Planning Support System GAMIFICATION Mission Sightseeing Plan Creation and Sharing System Web Geographic Information Systems (Web-giss)
下载PDF
A PRACTICAL METHOD FOR RICE ACREAGE STIMATION WTTH REMOTE SENSING
20
作者 Liu Haiyan(Commission for Intngated Survey of Natural Resources, CAS, Beijing 100101People’s Republic of China)Wu Bingfang Fang Honghang HuangJinliang(LREIS, Ihstitute of Gcoraphy, CAS Beijing 100101 People’s Republic of China) 《Journal of Geographical Sciences》 SCIE CSCD 1996年第4期61-65,共5页
The crop area estimaton is one of the main fields in application of remotesensing. The paper focuses on the operational method for rice planting areaestimation, in which TM datu is used to ertract base rice area in a ... The crop area estimaton is one of the main fields in application of remotesensing. The paper focuses on the operational method for rice planting areaestimation, in which TM datu is used to ertract base rice area in a given year of1992. The NOAA AVHRR data is used to prwhct the changing tendency of the nceplanting area. The base area data needs to be updated for every rice growth penodupon the availability of TM data. Three methods can be used to extract the base riceplanting area. They are (1) visual interpretation with interaedve adjustmant on thescreen, (2) iflteraCtive automatic classification with manual elinunating of the non-rice pixels on the screen, and (3) automatic dassification with GIS spatial analysis.These methods can be combined to increase reliability and accuracy. The currentpaper is only concemed with the description of the second method. MultitemporalNOAA AVHRR SAVI data are combined as multiband image and are classifiedusing supetwsed makimum likelihood classifier on ERDAS to prediCt the changingtendency of rice planting area. The method has been successfully used in extraCtingearly nce area in Hubei Province in 1994 and acceptable result was obtained. 展开更多
关键词 area extraction Change detection supervised maximum liklihood classification giss
下载PDF
上一页 1 2 下一页 到第
使用帮助 返回顶部