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自反Banach空间上的函数序列的弱上境收敛的几个结果 被引量:1
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作者 何兴强 肖正昌 《华南师范大学学报(自然科学版)》 CAS 1997年第4期35-39,共5页
本文对定义在自反Banach空间的内部非空有界闭凸集上的函数序列的弱上境收敛(w-epi-convergence)进行了研究,并得到了关于弱上境收敛的极限函数的一个下确界刻划,且其中下确界能取到的结果.在此基础上得到... 本文对定义在自反Banach空间的内部非空有界闭凸集上的函数序列的弱上境收敛(w-epi-convergence)进行了研究,并得到了关于弱上境收敛的极限函数的一个下确界刻划,且其中下确界能取到的结果.在此基础上得到了弱上境收敛极限函数的弱序列下半连续性. 展开更多
关键词 Mosco收敛 上境收敛 巴拿赫空间 函数序列
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中国内地学生与香港青年网络利用现状之比较 被引量:3
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作者 谢友宁 王美珍 《江苏图书馆学报》 2002年第4期39-40,共2页
论文是一篇在调查基础上的比较研究报告,通过比较,提出大陆学生与香港学生在网络利用上的差异,突出表现在上网时间和利用网络信息价值取向两个方面。
关键词 网络利用 读者调查 青年学生 上境 价值取向 中国大陆 香港 电子阅览室
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Design and evaluation of UHPP steel bridge deck pavement for high-temperature and rainy regions
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作者 Qian Zhendong Zhang Shaojin +1 位作者 Min Yitong Zhao Xinyuan 《Journal of Southeast University(English Edition)》 EI CAS 2024年第3期257-265,共9页
To enhance the serviceability of steel bridge deck pavement(SBDP)in high-temperature and rainy regions,a concept of rigid bottom and flexible top was summarized using engineering practices,which led to the proposal of... To enhance the serviceability of steel bridge deck pavement(SBDP)in high-temperature and rainy regions,a concept of rigid bottom and flexible top was summarized using engineering practices,which led to the proposal of a three-layer ultra-high-performance pavement(UHPP).The high-temperature rutting resistance and wet-weather skid resistance of UHPP were evaluated through composite structure tests.The internal temperature distribution within the pavement under typical high-temperature conditions was analyzed using a temperature field model.Additionally,a temperature-stress coupling model was employed to investigate the key load positions and stress response characteristics of the UHPP.The results indicate that compared with the traditional guss asphalt+stone mastic asphalt structure,the dynamic stability of the UHPP composite structure can be improved by up to 20.4%.Even under cyclic loading,UHPP still exhibits superior surface skid resistance compared to two traditional SBDPs.The thickness composition of UHPP significantly impacts its rutting resistance and skid resistance.UHPP exhibits relatively low tensile stress but higher shear stress levels,with the highest shear stress occurring between the UHPP and the steel plate.This suggests that the potential risk of damage for UHPP primarily lies within the interlayer of the pavement.Based on engineering examples,introducing interlayer gravel and optimizing the amount of bonding layer are advised to ensure that UHPP possesses sufficient interlayer shear resistance. 展开更多
关键词 steel bridge deck pavement(SBDP) high-temperature environment rainy weather rigid bottom and flexible top temperature field composite structure
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关于拟导数的性质
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作者 何兴强 肖正昌 《华南师范大学学报(自然科学版)》 CAS 1998年第3期96-99,共4页
本文对形如Mf±Ng(M≥0N≥0)形式的函数的拟导数(Mf±Ng)′x的存在性及其与Mf′x±Ng′x的关系进行了研究。
关键词 自反BANACH空间 上境收敛 Mosco收敛 拟导数
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Research on Ecological Regionalization of Inland Lake Wetland of Bashang in Hebei Province 被引量:1
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作者 张茹春 阳小兰 +3 位作者 高士平 陈辉 王瑞君 蒋红军 《Agricultural Science & Technology》 CAS 2010年第8期125-128,144,共5页
An ecological regionalization index system was established for Bashang inland lake wetland based on ecological and environmental factors,with landform,geomorphy,vegetation types and climate as primary indices,micro-la... An ecological regionalization index system was established for Bashang inland lake wetland based on ecological and environmental factors,with landform,geomorphy,vegetation types and climate as primary indices,micro-landform,vegetation type,soil type,climate,ecosystem types,wetland features and human activities as secondary indices. Based on these index systems,the area was divided into three eco-environment regions and nine sub eco-environment regions. An eco-regional map of Bashang inland lake wetland was drawn by using GIS. The ecological characteristics,existing problems and control measures of each region were described. This study will supply guidance for the construction of local ecological environment and regulation of industrial structure,promoting sustainable development of Bashang inland lake wetland. 展开更多
关键词 Ecological regionalization ECO-ENVIRONMENT Bashang wetland
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Influence of Epistasis and QTL×Environment Interaction on Heading Date of Rice(Oryza sativa L.) 被引量:3
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作者 刘桂富 杨剑 +1 位作者 徐海明 朱军 《Journal of Genetics and Genomics》 SCIE CAS CSCD 北大核心 2007年第7期608-615,共8页
QTLs for heading date of rice (Oryza sativa L.) with additive, epistatic, and QTL × environment (QE) interaction effects were studied using a mixed-model-based composite interval mapping (MCIM) method and a... QTLs for heading date of rice (Oryza sativa L.) with additive, epistatic, and QTL × environment (QE) interaction effects were studied using a mixed-model-based composite interval mapping (MCIM) method and a double haploid (DH) population derived from IR64/Azucena in two crop seasons. Fourteen QTLs conferring heading date in rice, which were distributed on ten chromosomes except for chromosomes 5 and 9, were detected. Among these QTLs, eight had single-locus effects, five pairs had double-locus interaction effects, and two single-loci and one pair of double-loci showed QTL × environment interaction effects. All predicted values of QTL effects varied from 1.179 days to 2.549 days, with corresponding contribution ratios of 1.04%-4.84%. On the basis of the effects of the QTLs, the total genetic effects on rice heading date for the two parents and the two superior lines were predicted, and the putative reasons for discrepancies between predicted values and observed values, and the genetic potentiality in the DH population for improvement of heading date were discussed. These results are in agreement with previous results for heading date in rice, and the results provide further information, which indicate that both epistasis and QE interaction are important genetic basis for determining heading date in rice. 展开更多
关键词 quantitative trait locus (QTL) EPISTASIS QTL ×environment interaction heading date rice (Oryza sativa L.)
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Impacts of Environmental Factors on the Structure Characteristics of Avian Community in Shanghai Woodlots in Spring 被引量:31
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作者 葛振鸣 王天厚 +2 位作者 施文彧 周立晨 薛文杰 《Zoological Research》 CAS CSCD 北大核心 2005年第1期17-24,共8页
From March to May, 2004, we selected 8 typical parks or green lands in Shanghai downtown as the study sites to conduct a ornithological research. During this study, total 55 species of birds were recorded, which inclu... From March to May, 2004, we selected 8 typical parks or green lands in Shanghai downtown as the study sites to conduct a ornithological research. During this study, total 55 species of birds were recorded, which included 31 resident and 24 migratory species. With statistics methodology, we analyzed the avian communities with 10 major environmental factors covering the park area, water percentage, vegetation species, canopy cover, shrub cover, grass cover, hill number, location condition, human quantity, path width, the study results indicated that: (1) the following 7 environmental factors were important to impact the structures of the avian community, they were park area, vegetation species, shrub coverage, grass coverage, hill number, location condition of the parks and path width; (2) the avian community of theses urban parks tended to deteriorate in the bird number and diversity; the man-made lake which was currently promoted in the park designing and planning process would not be good to attract the birds. 展开更多
关键词 Urban avian community Bird diversity Key environmental factor Shanghai park
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Impact of Urbanization on Shanghai's Soil Environmental Quality 被引量:53
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作者 HUXue-Feng WUHe-Xin HUXing FANGSheng-Qiong WUchen-Juan 《Pedosphere》 SCIE CAS CSCD 2004年第2期151-158,共8页
Heavy metal contents in the soils in the Baoshan District of Shanghai were monitored to evaluate the risk of soil environmental quality degradation due to rapid urbanization and to reveal the ways of heavy metal accum... Heavy metal contents in the soils in the Baoshan District of Shanghai were monitored to evaluate the risk of soil environmental quality degradation due to rapid urbanization and to reveal the ways of heavy metal accumulation in soil during rapid urban sprawl. It was found that the soils in this district were commonly contaminated by Pb, Zn and Cd. Evaluated with a geo-accumulation index (Igeo), the rate of Pb contamination in soils was 100% with 59% of these graded as moderate-severe or severe; Zn contamination reached 59% with 6% graded as moderate-severe or severe; and Cd contamination was over 50%, with one site graded as moderate-severe and another severe-extremely severe. Metal contamination of soils around the Shanghai metropolis was mainly attributed to traffic, industrial production, wastewater irrigation and improper disposal of solid wastes. Because of continuing urbanization, the cultivated land around the metropolis should be comprehensively planned and carefully managed. Also the soil environmental quality of vegetable production bases in this area should be monitored regularly, with vegetables to be grown selected according to the degrees and types of soil contamination. 展开更多
关键词 CONTAMINATION heavy metals soil environmental quality URBANIZATION
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Context-Aware Service IVlodes in the Cloud Computing Environment 被引量:3
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作者 Pan Yu Luo Lijuan +1 位作者 Gao Li Lv Tingjie 《China Communications》 SCIE CSCD 2012年第2期86-95,共10页
This paper discussed the differences of context-aware service between the cloud computing environment and the traditional service system.Given the above differences,the paper subsequently analyzed the changes of conte... This paper discussed the differences of context-aware service between the cloud computing environment and the traditional service system.Given the above differences,the paper subsequently analyzed the changes of context-aware service during preparation,organization and delivery,as well as the resulting changes in service acceptance of consumers.Because of these changes,the context-aware service modes in the cloud computing environment change are intelligent,immersive,highly interactive,and real-time.According to active and responded service,and authorization and non-authorized service,the paper drew a case diagram of context-aware service in Unified Modeling Language(UML) and established four categories of context-aware service modes. 展开更多
关键词 cloud computing context-aware service service mode
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Contextual Adaptation of Language Choices -With Reference to Obama's 2015 State of the Union Address 被引量:1
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《International English Education Research》 2015年第4期94-96,共3页
An empirical research is done on how political Obama's 2015 State of the Union Address as the corpora sample speeches adapt to context in the framework of adaptation theory, taking This paper shows that language choi... An empirical research is done on how political Obama's 2015 State of the Union Address as the corpora sample speeches adapt to context in the framework of adaptation theory, taking This paper shows that language choices in the State of the Union Address are adaptive to all the levels of the context, including communicative context (language users, mental world, social world, and physical world) and linguistic context. It is confirmed one of the theoretical stances of adaptation theory that there is no language use without being adaptive to context. 展开更多
关键词 contextual adaptation 2015 State of the Union Address of the USA case study
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Study on oil–source correlation by analyzing organic geochemistry characteristics: a case study of the Upper Triassic Yanchang Formation in the south of Ordos Basin, China 被引量:5
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作者 Delu Li Rongxi Li +6 位作者 Baoping Wang Zhi Liu Xiaoli Wu Futian Liu Bangsheng Zhao Jinghua Cheng Wenbin Kang 《Acta Geochimica》 EI CAS CSCD 2016年第4期408-420,共13页
In the south of the Ordos Basin, the oil source of the Upper Triassic Yanchang Formation is confused all the time, which affects further exploration. In this study, oil sources from the oil layers of Ch6, Ch8 and Ch9 ... In the south of the Ordos Basin, the oil source of the Upper Triassic Yanchang Formation is confused all the time, which affects further exploration. In this study, oil sources from the oil layers of Ch6, Ch8 and Ch9 are all analyzed and confirmed. Through their carbon isotope value and biomarkers, characteristics of crude oils from the Yanchang Formation are analyzed. Then, the oil–source relation is discussed, with the source rocks' features.Finally, the oil–source relation is calculated through cluster analysis. It is believed that the oils from the Yanchang Formation deposit in a similar redox environment, with weak oxidation–weak reduction, and have all entered maturity stage. Ch9 crude oil is more mature than crude oils from Ch6 and Ch8, and has more advanced plants and fewer algae. Gas chromatography(GC) and gas chromatography–mass spectrometry(GC–MS) analysis show that crude oils from Ch6 and Ch8 may come from Ch7, and Ch9 crude oil may not. Cluster analysis displays that crude oils from Ch6 and Ch8 have closer squared Euclidean distance with Ch7 source rocks than Ch9 crude oil does,indicating crude oils from Ch6 and Ch8 stem from Ch7 source rocks. And Ch9 crude oil has rather close squared Euclidean distance with Ch9 source rocks, illustrating Ch9 crude oil may be from Ch9 source rocks. This research may provide the theoretical basis for the next exploration deploy in the south of Ordos Basin. 展开更多
关键词 Carbon isotope correlation - Cluster analysis Basin Introduction Biomarker Oil-source Yanchang Formation - Ordos
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Distribution of Methyl Mercury in Rana chensinensis and Environmental Media in Gold-mining Areas of Upper Reaches of Songhua River,China 被引量:1
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作者 WANG Ning ZHANG Gang +1 位作者 LIU Te CAI Qingxiang 《Chinese Geographical Science》 SCIE CSCD 2010年第4期330-336,共7页
The distribution characteristics of methyl mercury in Rana chensinensis and water,sediment and soil in gold-mining areas of the upper reaches of the Songhua River,China were studied by field sampling and laboratory te... The distribution characteristics of methyl mercury in Rana chensinensis and water,sediment and soil in gold-mining areas of the upper reaches of the Songhua River,China were studied by field sampling and laboratory testing.The results show that the methyl mercury contents in water,sediment and soil in gold-mining areas are much higher than those in the control site,indicating that gold-mining activities intensify the methyl mercury pollution in the study area.Methyl mercury contents are in a descending order of sediment > soil > water in the environment,and in a descending order of brain > viscera > muscle > skin in Rana chensinensis.There are significant correlation between methyl mercury contents in Rana chensinensis and those in water and sediment.In particular,the methyl mercury content in the skin of Rana chensinensis is positively correlated with those in water and sediment in spring.Therefore,skin is one of main intake pathways for methyl mercury due to its high permeability. 展开更多
关键词 methyl mercury Rana chensinensis environmental pollution gold-mining area Songhua River
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Duality of Unary Convex Functions Programming
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作者 朱德通 《Chinese Quarterly Journal of Mathematics》 CSCD 1993年第4期32-39,共8页
Most nonliner programming problems consist of functions which are sums of unary,convex functions of linear fuctions.In this paper.we derive the duality forms of the unary oonvex optimization, and these technuqucs are ... Most nonliner programming problems consist of functions which are sums of unary,convex functions of linear fuctions.In this paper.we derive the duality forms of the unary oonvex optimization, and these technuqucs are applied to the geometric programming and minimum discrimination information problems. 展开更多
关键词 unary convex optimization duality form conjugate transform
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Assessment of Habitat Suitability in the Upper Reaches of the Min River in China 被引量:9
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作者 GUO Ya-lin WANG Qing +2 位作者 YAN Wei-po ZHOU Qin SHI Min-qiu 《Journal of Mountain Science》 SCIE CSCD 2015年第3期737-746,共10页
HabRat richness influences and even determines biological diversity. Plant habitat suitability assessment can provide technical guidance and information support for ecological restoration. Thirteen factors in three ca... HabRat richness influences and even determines biological diversity. Plant habitat suitability assessment can provide technical guidance and information support for ecological restoration. Thirteen factors in three categories of terrain, meteorology and soil were chosen to build a habitat suitability assessment index framework in the Upper Reaches of the Min River, based on the local natural environment and the actual influencing factors of vegetative growth. Combined with the Analytic Hierarchy Process (AHP) and entropy method, which were used to calculate weights of indexes, habitat suitability was studied by using a multi-objective linear weighting model and geographic information systems (GIS) spatial analysis techniques. The assessment results are as follows: Altitude, soil stability, aspect and slope have more important effects on plant habitat suitability in the Upper Reaches of the Min River, and their weights are o.311, 0.260, o.198 and o.125, respectively. Suitable and sub-suitable habitats cover 4431.8o km2 and 6171.12 km2, respectively; most of which are distributed along both sides of rivers and have higher suitability. Unsuitable habitats cover the largest area (6679.76 km2), accounting for 29.83% of the whole area; and the worst unsuitable habitats are 5107.23 km2 (22.81%); they account for more than half of the study area. These results indicate that the plant habitat in the Upper Reaches of the Min River is poor and ecological restoration is both urgent and difficult. Therefore, based on the principle of taking measures suitable to the habitat in ecological restoration projects, ecological and engineering measures should be combined to have better effects, while increasing the strength of ecological protection. 展开更多
关键词 Habitat suitability Analytic hierarchyprocess (AHP) Entropy method Spatial analysis Min River China
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Changes in permafrost environments caused by construction and maintenance of Qinghai-Tibet Highway 被引量:2
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作者 林战举 牛富俊 +2 位作者 罗京 鲁嘉濠 刘华 《Journal of Central South University》 SCIE EI CAS 2011年第5期1454-1464,共11页
The sideward permafrost along the Qinghai-Tibet Highway (QTH) contains massive ground-ice and is at a relatively high temperature.Under the influence of the steady increase of human activities,the permafrost environme... The sideward permafrost along the Qinghai-Tibet Highway (QTH) contains massive ground-ice and is at a relatively high temperature.Under the influence of the steady increase of human activities,the permafrost environment has been changed greatly for a long time.At present,the permafrost becomes warm and rapidly degenerates,including the decline of the permafrost table,rising of the ground temperature,shortening of the length of frozen section,and extension of range of melting region.Some thaw hazards (e.g.thaw slumping and thermokarst pond) have widely occurred along both sides of the roadbed.In addition,due to the incomplete construction management,the vegetation adjacent to the highway is seriously damaged or eradicated,resulting in the land desertification and ecosystem out of balance.The dust,waste and garbage brought by drivers,passengers,maintenance workers,and transportations may also pollute the permafrost environment. 展开更多
关键词 permafrost environment Qinghai-Tibet Highway thermokarst pond thaw slumping permafrost degradation
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Anaphora's Creating Irony by the Aid of Context
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作者 LIU Yan-chun 《Sino-US English Teaching》 2015年第9期647-653,共7页
The core function of anaphora is to serve as a substitute for a certain linguistic component in texts, but it actually has other missions such as creating the rhetorical effect--irony. However, anaphora alone cannot c... The core function of anaphora is to serve as a substitute for a certain linguistic component in texts, but it actually has other missions such as creating the rhetorical effect--irony. However, anaphora alone cannot contribute to ironic effect, and only by resorting to other resources like contextual information, can anaphora generate irony. Therefore, Yus' s classification of contextual sources is employed to analyze with examples how anaphora creates irony by the aid of context. Ultimately, the conclusion has been drawn that anaphora is able to produce irony with the help of six groups of contextual information classified by Yus except the category--speaker's nonverbal behavior and anapbora sometimes has to interact with several groups of contextual information in order to create irony. 展开更多
关键词 ANAPHORA IRONY contextual information
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An iterative interference cancellation based frequency offset estimation method for OFDMA uplink systems
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作者 周恩 Wang Wenbo 《High Technology Letters》 EI CAS 2006年第3期304-310,共7页
In this paper, Moose scheme is used for frequency offset estimation in OFDMA uplink svstems due to that the signals from different users can be easily distinguished in frequency domain. However, differential multiple ... In this paper, Moose scheme is used for frequency offset estimation in OFDMA uplink svstems due to that the signals from different users can be easily distinguished in frequency domain. However, differential multiple access interference (MAI) will deteriorate the frequency offset estimation performances, especially in interleaved OFDMA system. Analysis and simulation results manifest that frequency offset estimation by Moose scheme in block OFDMA system is more robust than that in interleaved OFDMA systern. And an iterative interference cancellation method has been proposed to suppress the differential MAI interference for interleaved OFDMA system, in which Moose scheme is the special case of the number of iteration is equal to one. Simulation results demonstrate that the proposed method can improve the performance with the increase of the number of iterations. In consideration of the performance and complexity, the proposed method with two iterations is selected. And the full comparison results of the proposed iterative method with two iterations and that with one iteration (conventional Moose scheme) are given in the paper, which sufficiently demonstrate that the performance gain can be obtained by the interference cancellation operation in interleaved OFDMA system. 展开更多
关键词 frequency offset estimation interference cancellation asynchronous environment OFDMA uplink system
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Dust source of the Holocene loess-soil and pedogenic environmental changes in the upper Huaihe River 被引量:5
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作者 李新艳 黄春长 +1 位作者 庞奖励 何忠 《Journal of Geographical Sciences》 SCIE CSCD 2009年第1期107-117,共11页
Based on field surveys,soil samples were collected at the YPC site,Yuzhou City,Henan Province for analysis of contents of major and trace elements and their variations with XRF and comparison with the curves of magnet... Based on field surveys,soil samples were collected at the YPC site,Yuzhou City,Henan Province for analysis of contents of major and trace elements and their variations with XRF and comparison with the curves of magnetic susceptibility,pH value distribution,loss on ignition and particle-size distribution.It was concluded that the dust source of loess in the upper reaches of the Huaihe River Basin was different from that in the Loess Plateau.And the Holocene pedogenic environmental changes in the upper reaches of the Huaihe River Basin were revealed. 展开更多
关键词 LOESS PALAEOSOL HOLOCENE dust source upper reaches of the Huaihe River China
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The Fault Line in Chinese Reflective Thinking 被引量:1
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作者 Jim Platts 《Journal of Philosophy Study》 2013年第10期945-957,共13页
Behind what is called "Needham's Grand Question" (why was China overshot by the West in science and technology?) lies a deeper question of how China came to lose the capacity of deeply reflective thought clearly... Behind what is called "Needham's Grand Question" (why was China overshot by the West in science and technology?) lies a deeper question of how China came to lose the capacity of deeply reflective thought clearly present in the ancient Chinese philosophers. This is a loss felt by all Chinese as a psychological sense of hollowness, a loss of identity, made worse by the seeming inaccessibility of the ancient Chinese wisdom to the modern Chinese mind. It is clear that at some historical point China suffered an extreme psychological blow sufficient to traumatise it at the threshold of reflective thought, unable to look inwards any more. The paper identifies that point as the utter devastation wrought by Kublai Khan and the Mongols 750 years ago. What devastates reflective thought is wilfulness, the insistent focusing of all attention and energy on external, material things, and Kublai Khan was wilful in the extreme. What confirms this as the crippling point is that, in response to Kublai Khan's Mongol invasion the Chinese, over time, not only completely altered the geography of China itself, moving their capital to the North (Beijing), but have ever since fought to establish as "China" all the territory over which Kublai Khan ruled. China is clearly not free of Kublai Khan's shadow. But even more precisely, in the process of doing this--and showing their own wilfulness--in building the Forbidden City in Beijing they built it in the shape of the Chinese metaphysical model of the universe, the Chinese version of the Tree of Life metaphysical glyph But it has an error in it. And the error is precisely that in where it places things, it makes what would have been the attributes of reflective thought subservient to wilfulness. The model itself thus shows the hollowness of the Chinese mind from that moment on. The outer form--the "appearance"---of the ancient wisdom was still there. But the content--the "substance"--of it was not. And with no reflective thought, true creativity disappears. 展开更多
关键词 Needham's grand question Kublai Khan the Forbidden City the Tree of Life reflective thinking wilfulness psychological block
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IMPACT EVALUATION OF HAIZUKA DAM ON ITS UP STREAM A CASE STUDY IN HIROSHIMA PREFECTURE, JAPAN
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作者 Forood AZARI DEHKORDI Nobukazu NAKAGOSHI 《Chinese Geographical Science》 SCIE CSCD 2004年第4期350-354,共5页
Japan ranks fifth in the world for the number of large dams. Environmental impacts of large dams are known, such as enormous losses of water or disruption of fish spawning, however, impacts of the dams on their up str... Japan ranks fifth in the world for the number of large dams. Environmental impacts of large dams are known, such as enormous losses of water or disruption of fish spawning, however, impacts of the dams on their up streams are functions of topography of the up stream. Haizuka Dam is located in Hiroshima Prefecture, Japan and its implementation will start in 2006. This large dam influences its up stream through dam making activities, which occurs in order and with different spatial presences that were categorized into chronological and spatial impacts. In this case study, spatial impacts were further divided into horizontal and vertical ones. The horizontal impacts were identified as new roads, diversion tunnel, dam lake, and submerged cultivated land, while vertical impacts were recognized as submerged historical monuments, slope protections, dam body, and deforested area in the reservoir. There were convergences of spatial and temporal impacts, however, the extent of the impacts was limited to the lake boundary. 展开更多
关键词 dam impact up stream Haizuka Dam JAPAN
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