|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Stable classi?cation with limited sample: transferring a 30-m resolution sample set collected in 2015 to mapping 10-m resolution global land cover in 2017显示文摘As the world strives to reduce the impact of population growth, urbanization, agricultural expansion, and climate change on food security, energy and water shortage, resource over-exploration, biodiversity loss, environmental pollution, and ultimately human health, timely and higher resolution land cover information is urgently needed to achieve the sustainable development goals of the United Nations. | Peng Gong Han Liu Meinan Zhang Congcong Li Jie Wang Huabing Huang Nicholas Clinton Luyan Ji Wenyu Li Yuqi Bai Bin Chen Bing Xu Zhiliang Zhu Cui Yuan Hoi Ping Suen Jing Guo Nan Xu Weijia Li Yuanyuan Zhao Jun Yang Chaoqing Yu Xi Wang Haohuan Fu Le Yu Iryna Dronova Fengming Hui Xiao Cheng Xueli Shi Fengjin Xiao Qiufeng Liu Lianchun Song | 2019 | Science Bulletin2019，64，6： | 166 |
| 2 | 秦-祁-昆造山带元古宙副变质岩层碎屑锆石年龄谱研究显示文摘根据秦-祁-昆造山带中北大河岩群、湟源岩群、化隆岩群、金水口岩群、陡岭岩群和秦岭岩群等副变质岩层碎屑锆石年龄谱资料,这些原定为古元古代的地层,至少包括测年样品在内的部分地层的时代应属中元古代或新元古代初期。研究资料还显示上述碎屑岩层具有大量中元古代早期的物源,而古元古代蚀源物质较匮乏。因此,上述副变质岩层显示出相近的碎屑锆石年龄谱特征。 | 陆松年 李怀坤 王惠初 陈志宏 郑健康 相振群 | 2009 | 岩石学报2009，25，9： | 77 |
| 3 | Impacts of climate warming on plants phenophases in China for the last 40 years显示文摘Based on plant phenology data from 26 stations of the Chinese Phenology Observation Network of the Chinese Academy of Sciences and the climate data, the change of plant phenophase in spring and the impact of climate warming on the plant phenophase in China for the last 40 years are analyzed. Furthermore, the geographical distribution models of phenophase in every decade are reconstructed, and the impact of climate warming on geographical distribution model of phenophase is studied as well. The results show that (i) the response of phenophase advance or delay to temperature change is nonlinear. Since the 1980s, at the same amplitude of temperature change, phenophase delay amplitude caused by temperature decrease is greater than phenophase advance amplitude caused by temperature increase; the rate of phenophase advance days decreases with temperature increase amplitude, and the rate of phenophase delay days increases with temperature decrease amplitude. (ii) The geographical distribution model between | ZHENG Jingyun GE Quansheng HAO Zhixin | 2002 | Chinese Science Bulletin2002，47，21： | 41 |
| 4 | 一种基于信誉和风险评价的分布式P2P信任模型显示文摘针对目前大规模P2P系统不能有效处理恶意节点攻击的问题,该文提出一种新的基于信誉与风险评价的P2P系统信任模型,该模型考虑到节点的动态行为影响信任度计算的不确定性,引入风险因素,并提出采用信息熵理论来量化风险,将实体之间的信任程度和信任的不确定性统一起来。仿真试验及分析表明,该信任模型能够有效识别恶意节点,相比已有的一些信任模型较大程度地提高了系统成功交易率,可以使节点之间更有效地建立信任关系。 | 田春岐 邹仕洪 田慧蓉 王文东 程时端 | 2007 | 电子与信息学报2007，29，7： | 47 |
| 5 | The impact of meteorological changes from 2013 to 2017 on PM2.5 mass reduction in key regions in China显示文摘In 2013,China issued the'Action Plan for the Prevention and Control of Air Pollution'('Ten Statements of Atmosphere')and implemented a series of pollution reduction measures from 2013 to 2017.In key regions of China,the mass concentrations of particulate matter with aerodynamic equivalent diameters less than 2.5μm(PM2.5)have dropped significantly.However,the contributions of meteorological changes to PM2.5 reduction are largely uncertain,which has attracted particular concern from the government and the public.Here,we investigated the impact of large-scale and boundary layer(BL)meteorological conditions on aerosol pollution and estimated the contributions of meteorological changes to PM2.5 reduction based on in-depth analysis and diagnosis of various observed meteorological elements and an integrated pollution-linked meteorological index(PLAM,which is approximately and linearly related to PM mass concentration).In this study,we found that the meteorological conditions worsened in 2014 and 2015 and improved in 2016 and 2017 relative to those in 2013 in key regions in China.In 2017 relative to 2013,only^5%(approximately 13%of the total PM2.5 decline)of the 39.6%reduction in PM2.5 mass concentrations can be attributed to meteorological changes in the Beijing-Tianjin-Hebei(BTH)region,and only^7%(approximately 20%of the total PM2.5 decline)of the 34.3%reduction can be attributable to meteorological changes in the Yangtze River Delta(YRD)region.Overall,the PM2.5 reduction due to meteorological improvement is much lower than the observed PM2.5 reduction in these areas,which indicates that emission reduction during the five-year implementation of the'Ten Statements of Atmosphere'is the dominant factor in the improvement in air quality.The changes in meteorology and climate are conducive to PM2.5 reduction but do not dominate the substantial improvement in air quality.Similar to the above regions,in the Pearl River Delta(PRD)region,the impact of meteorological changes on the annual averaged PM2.5 concentration from 2013 to2017 was relatively weak,and the PM2.5 reduction was mainly due to emission reductions.During winter 2017(January,February,and December of this year),the meteorological conditions improved-20%in the BTH region(observed total PM2.5reduction:40.2%)and-30%in the YRD region(observed total PM2.5 reduction:38.2%)relative to those in 2013,showing the meteorological factors played more important role in the decrease of PM2.5 in winter of these years in the two regions,respectively.The meteorological conditions in winter 2016 were 14%better than those in winter 2017,but the PM2.5 reduction in winter 2016 was still less than that in winter 2017,reinforcing the significant contributions of the increasing efforts to reduce PM2.5 emissions in 2017.The substantial progress of strict emission measures was also confirmed by a comparison of several persistent heavy aerosol pollution episodes(HPEs)with similar meteorological conditions.It is found that the decrease of PM2.5mass caused by emission reduction increases year by year,especially the decrease of PM2.5 concentration in 2016 and 2017.In China,HPEs mainly occur in winter,when meteorological conditions are approximately 40-100%worse than in other seasons.This worsening is partly due to the harbor effect of high topography,including downdrafts and the weak wind zone,and partly due to the increasingly stable regional BL structure caused by climate warming.For the formation of HPEs,it occurred under regional stagnant and stable conditions associated with upper-level circulation patterns,including the zonal westerly winds type and high-pressure ridges.After pollution formation,PM2.5 with mass accumulated to a certain degree can further worsen the BL meteorological conditions.The feedback effect associated with worsening conditions dominates PM2.5 mass explosive growth.In the context of high air pollutant emissions in China,unfavorable meteorological conditions are the necessary external conditions for the formation and accumulation of HPEs.Therefore,reducing aerosol pollution significantly during the earlier transport stage is critical in reducing persistent HPEs.Currently,even under favorable meteorological conditions,allowing emissions without restriction is also not advisable because aerosol pollution allowed to accumulate to a certain extent will significantly worsen the BL meteorological conditions and close the'meteorological channels'available for pollution dispersion. | Xiaoye ZHANG Xiangde XU Yihui DING Yanju LIU Hengde ZHANG Yaqiang WANG Junting ZHONG | 2019 | Science China Earth Sciences2019，62，12： | 42 |
| 6 | Restoring the Treg cell to Th17 cell ratio may alleviate HBV-related acute-on-chronic liver failure显示文摘AIM: To investigate the role of T helper 17 cells (Th17) and regulatory T cells (Treg) in hepatitis B virus (HBV)-related acute-on-chronic liver failure (ACLF).METHODS: We enrolled 79 patients with HBV infection into the study, 50 patients with HBV-related ACLF and 29 patients with chronic hepatitis B (CHB), from the First Affiliated Hospital of Medical College from January 2009 to June 2012. The ACLF patients were diagnosed according to the criteria recommended by The 19th Conference of the Asian Pacific Association for the Study of the Liver in 2009. Twenty healthy individuals with a similar gender and age structures to the two patient groups were also included as the normal controls (NC). Of the 50 ACLF patients, 28 were subsequently classified as non-survivors: 19 patients died from multiorgan failure, 3 underwent liver transplantation, and 6 discontinued therapy during follow-up because of financial reasons. The remaining 22 ACLF patients whose liver and anticoagulation function recovered to nearly normal levels within the next 6 mo were classified as survivors. The number of circulating Treg and Th17 cells was determined upon diagnosis and during the 8th week of follow-up through flow cytometry. RESULTS: The percentage of circulating Treg cells in the ACLF group was significantly higher than that in the CHB group (5.50% ± 1.15% vs 3.30% ± 1.13%, P < 0.01). The percentages of circulating Th17 cells in the ACLF and the CHB groups were significantly higher than that in the NC group (6.32% ± 2.22% vs 1.56% ± 0.44%, P < 0.01; 3.53% ± 1.65% vs 1.56% ± 0.44%, P < 0.01). No significant difference in Treg cell to Th17 cell ratio was observed between the ACLF group and the CHB group (0.98 ± 0.44 vs 1.12 ± 0.64, P = 0.991), whereas those in the two HBV infection groups were significantly lower than that in the NC group (1.85 ± 1.22; both P < 0.01). The percentage of Treg cells in the survivors during the 8th week of follow-up was significantly lower than that during peak ACLF severity [total bilirubin (TBIL) peak] (3.45% ± 0.97% vs 5.18% ± 1.02%, P < 0.01). The percentage of Th17 cells in survivors during the 8th week of follow-up was significantly lower than that during the peak TBIL (2.89% ±0.60% vs 5.24% ± 1.46%; P < 0.01). The Treg cell to Th17 cell ratio during the 8 th week of follow-up was significantly higher than that during the TBIL peak (1.22 ± 0.36 vs 1.10 ± 0.54; P < 0.05). CONCLUSION: Restoring the Treg cell to Th17 cell ratio during the follow-up phase of ACLF could maintain the immune system at a steady state, which favours good prognosis. | Ying-Hua Niu Dong-Lin Yin Hong-Li Liu Rui-Tian Yi Yu-Cong Yang Hong-An Xue Tian-Yan Chen Shu-Lin Zhang Shu-Mei Lin Ying-Ren Zhao | 2013 | World Journal of Gastroenterology2013，19，26： | 36 |
| 7 | 再论民事诉讼立案程序的功能与结构显示文摘在我国民事诉讼制度中,最混乱不堪的程序环节莫过于立案程序。2012年《民事诉讼法修正案》的相关修改条款因囿于旧的规范框架和程序结构之内而无法在政治和谐、保障当事人诉权、加速司法效率三大宗旨之间谋求平衡。我国立案程序的混乱状况使得其结构与功能安排产生了诸多实践问题和理论困境,如:立案混合审查制产生诉讼时效起算点等法律难题;法院起诉审查截断原、被告之间的诉答程序,从而造成诉权保障与程序效率双重受损;答辩义务或权利期间缺乏适当法律拘束,从而导致程序公平与效率目标双双落空;先行调解的程序尴尬和宗旨悖逆,等等。以新法的规范和宗旨为前提,通过法律解释和司法改革,将立案程序与审前程序乃至与诉前途径之间进行界分和衔接,能够实现其基本宗旨。 | 傅郁林 | 2014 | 上海大学学报(社会科学版)2014，31，1： | 40 |
| 8 | 名词定义试拟:被遗忘权(Right to Be Forgotten)显示文摘“被遗忘权”(Right to Be Forgotten)也被称为“删除的权利”(The Right to Erasure),是隐私权在互联网时代延伸出来的一种新的权利类型。最早关注到这一方面问题的是著名记者、隐私权专家帕卡德(Vance Packard),1967年1月他在《纽约时报》发表的文章《不能告诉计算机》中写道: | 吴飞 | 2014 | 新闻与传播研究2014，21，7： | 39 |
| 9 | Coordinated optimal dispatch and market equilibrium of integrated electric power and natural gas networks with P2G embedded显示文摘As power to gas(P2 G) technology gradually matures, the coupling between electricity networks and natural gas networks should ideally evolve synergistically.With the intent of characterizing market behaviors of integrated electric power and natural gas networks(IPGNs)with P2 G facilities, this paper establishes a steady-state model of P2 G and constructs optimal dispatch models of an electricity network and a natural gas network separately. In addition, a concept of slack energy flow(SEF) is proposed as a tool for coordinated optimal dispatch between the two networks. To study how the market pricing mechanism affects coordinated optimal dispatch in an IPGN, a market equilibrium-solving model for an IPGN is constructed according to game theory, with a solution based on the Nikaido-Isoda function. Case studies are conducted on a joint model that combines the modified IEEE 118-node electricity network and the Belgian 20-node gas network.The results show that if the game between an electric power company and a natural gas company reaches market equilibrium, not only can both companies maximize their profits, but also the coordinated operation of the coupling units, i.e., gas turbines and P2 G facilities, will contribute more to renewable energy utilization and carbon emission reduction. | Zexing CHEN Yongjun ZHANG Tianyao JI Zexiang CAI Licheng LI Zhiheng XU | 2018 | Journal of Modern Power Systems and Clean Energy2018，6，3： | 37 |
| 10 | 谣言实现的社会机制及对信息的治理显示文摘Rumors are a type of false information, a consequence of an asymmetrical informational structure. This paper focuses on the social mechanisms of rumor fulfilling. Rumors with important contents related to people’s personal interests win acceptance through changing people’s expected payoffs, misleading people to the belief that acceptance of the rumor would beneficially outperform rejection of it. Nevertheless, it is risky to believe rumors; therefore, people make their decision whether to believe a rumor or not by referring to other people’s choices. An analysis was performed first within a game model that incorporated the variables of an individual’s expectancy and other people’s impact to predict whether the individual would accept or reject a rumor. Another analysis followed to further examine the functions of some dynamic mechanisms in rumor fulfilling when group pressure and network effects were introduced. Finally, an exploratory discussion on how to prevent rumors and erase their effects via information management strategies was presented. | 李国武 | 2005 | 社会2005，25，4： | 31 |
| 11 | 基于.NET MVC架构的网上珠宝销售系统的设计与实现显示文摘由于网络访问的快捷与便利,利用网络进行商品信息的管理与销售已经被广泛应用到各行各业中。针对珠宝这一特殊商品,利用Visual Studio 2010开发平台和SQL Sever 2008数据库软件,采用ASP.NET MVC架构设计一套网上珠宝销售系统,实现对珠宝信息的方便录入及快速查询,在保障珠宝安全的同时满足客户选购的需求。重点描述系统的整体设计模型,MVC架构在系统中的应用,并对数据建模与访问关键技术进行深入研究。该系统目前已应用于美国华尔街的某珠宝公司,实际应用证明该系统具有稳定、高效和安全的特点。 | 李志 贾克斌 李真真 姚萌 | 2013 | 计算机应用与软件2013，30，3： | 33 |
| 12 | 我国农业电子商务的模式分析显示文摘 | 彭璧玉 | 2001 | 南方农村2001，17，6： | 34 |
| 13 | Analysis of aerodynamic and thermodynamic parameters on the grassy marshland surface of Tibetan Plateau | TSUKAMOTO Osamu ISHIKAWA Hirohiko TAMAGAWA Ichiro | 2002 | Progress in Natural Science:Materials International2002，12，1： | 34 |
| 14 | Corrigendum to “Properties improvement of SPEEK based proton exchange membranes by doping of ionic liquids and Y_2O_3”[Prog. Nat. Sci.: Mater. Int. 22 (1) (2012) 26-30] | Jianbin Chen a, Qiang Guo a, Dan Li a, Juying Tong a,b, Xia Li a a School of Materials Science and Engineering, Shanghai University, Shanghai 201800, China b School of Wenling, Zhejiang TV University, Wenling 317500, China | 2012 | Progress in Natural Science:Materials International2012，22，3： | 33 |
| 15 | Differences in symptoms and pre-hospital delay among acute myocardial infarction patients according to ST-segment elevation on electrocardiogram: an analysis of China Acute Myocardial Infarction (CAMI) registry显示文摘Background: Approximately 70% patients with acute myocardial infarction (AMI) presented without ST-segment elevation on electrocardiogram. Patients with non-ST segment elevation myocardial infarction (NSTEMI) often presented with atypical symptoms, which may be related to pre-hospital delay and increased risk of mortality. However, up to date few studies reported detailed symptomatology of NSTEMI, particularly among Asian patients. The objective of this study was to describe and compare symptoms and presenting characteristics of NSTEMI vs. STEMI patients. Methods: We enrolled 21,994 patients diagnosed with AMI from China Acute Myocardial Infarction (CAMI) Registry between January 2013 and September 2014. Patients were divided into 2 groups according to ST-segment elevation: ST-segment elevation (STEMI) group and NSTEMI group. We extracted data on patients' characteristics and detailed symptomatology and compared these variables between two groups. Results: Compared with patients with STEMI (N=16,315), those with NSTEMI (N=5679) were older, more often females and more often have comorbidities. Patients with NSTEMI were less likely to present with persistent chest pain (54.3% vs.71.4%), diaphoresis (48.6% vs.70.0%), radiation pain (26.4% vs.33.8%), and more likely to have chest distress (42.4% vs.38.3%) than STEMI patients (all P<0.0001). Patients with NSTEMI were also had longer time to hospital. In multivariable analysis, NSTEMI was independent predictor of presentation without chest pain (odds ratio: 1.974, 95% confidence interval:1.849-2.107). Conclusions: Patients with NSTEMI were more likely to present with chest distress and pre-hospital patient delay compared with patients with STEMI. It is necessary for both clinicians and patients to learn more about atypical symptoms of NSTEMI in order to rapidly recognize myocardial infarction. | Rui Fu Chen-Xi Song Ke-Fei Dou Jin-Gang Yang Hai-Yan Xu Xiao-Jin Gao Qian-Qian Liu Han Xu Yue-Jin Yang | 2019 | Chinese Medical Journal2019，，5： | 29 |
| 16 | Optimal operation of electricity, natural gas and heat systems considering integrated demand responses and diversified storage devices显示文摘In recent years, the increasing penetration level of renewable generation and combined heat and power(CHP) technology in power systems is leading to significant changes in energy production and consumption patterns. As a result, the integrated planning and optimal operation of a multi-carrier energy(MCE) system have aroused widespread concern for reasonable utilization of multiple energy resources and efficient accommodation of renewable energy sources. In this context, an integrated demand response(IDR) scheme is designed to coordinate the operation of power to gas(P2 G) devices, heat pumps,diversified storage devices and flexible loads within an extended modeling framework of energy hubs. Subsequently, the optimal dispatch of interconnected electricity,natural gas and heat systems is implemented considering the interactions among multiple energy carriers by utilizing the bi-level optimization method. Finally, the proposed method is demonstrated with a 4-bus multi-energy systemand a larger test case comprised of a revised IEEE 118-bus power system and a 20-bus Belgian natural gas system. | Linna NI Weijia LIU Fushuan WEN Yusheng XUE Zhaoyang DONG Yu ZHENG Rui ZHANG | 2018 | Journal of Modern Power Systems and Clean Energy2018，6，3： | 30 |
| 17 | A high-resolution climatic change since the Late Glacial Age inferred from multi-proxy of sediments in Qinghai Lake显示文摘Based on multi-proxy analysis of pollen, carbonate, TOC, TN and δ13C of organic matters, a high-resolution climatic evolution of Qinghai Lake since the Late Glacial Age is recon-structed. The results indicate that the boundary between the Last Glacial Maximum and the Late Glacial Age is at about 18.2 cal.ka BP. The warm and wet period, which began at about 15.4 cal.ka BP, culminated at 7.4 cal.ka BP and came to its end at about 4.5 cal.ka BP. After that, the climate gradually became cold and dry. The multi-proxy analysis indicates that the climate fluc-tuated greatly during the transitional period from the Late glacial Age to the Holocene, and this is in good accordance with that reflected by deep sea cores of North Atlantic, ice cores of Greenland, lake sediments in Europe, loess sequences and Guliya ice core in China. The cli-matic evolutional characteristic of the Qinghai Lake since the Late Glacial Age shows that the driving force of the East-Asia Monsoon correlates with solar radiation on the ten-thousand-year scale. | Ryo Matsumoto | 2005 | Science China Earth Sciences2005，48，6： | 27 |
| 18 | 叶面喷施稀土对千年桐幼苗生长和生理的影响显示文摘The seedlings of Vernicia montana derived from seeds soaking with water (the first group)or 300 mg5L -1 mixed nitric_acid rare earth solution (the second group) were treated with various concentrations of mixed nitric_acid rare earth solution by foliage spraying. The results showed that the seedling heights sprayed with 100 和 1 000 mg·L -1 of the first group and with 50 和 100 mg·L -1 of the second group were significantly higher than the controls, and the diameter at ground level sprayed with 300 mg·L -1 of the second group was significantly greater than the control, being 26.92% more than the latter; except for spraying with 0 mg5L -1 and 700~1 500 mg5L -1 of the second group, the seedling dry weight above ground of others was 29.13%~73.91% greater than the control, whereas the seedling dry weight under ground of others was 20.78%~116.88% greater than the control; the contents of chlorophyll a and chlorophyll b for all spraying seedling were 91.67%~191.67% and 87.5%~306.25% greater than the control, respectively, and soluble proteins and soluble sugars were 16.00%~179.78% and 10.73%~105.65% greater than the control, respectively. Compared with the control, the activity of SOD tended to increase, whereas the contents of MDA decreased. These indicated that spraying leaves with optimum concentration of mixed nitric_acid rare earth solution could markedly promote the growth of seedlings and improve resistance ability of V. montana seedlings to bad environment. On the whole, the effects of spraying the leaves of seedling with 50~500 mg5L -1 mixed nitric_acid rare earth solution, which were derived from seeds soaking with 300 mg·L -1 mixed nitric_acid rare earth solution, were good. | 韦如萍 薛立 陈红跃 彭耀强 许松葵 | 2005 | 林业科学2005，41，2： | 28 |
| 19 | 再论中产阶级:理论、历史与类型学 兼及一种全球化的视野显示文摘The emergence of the middle class was closely related to the appearance of industrial society and its consequential constant changes in the social structure. Karl Marx and other theorists in the same camp were among the earliest scholars who discussed that topic. For a quite long period of time, the debate was mainly focused on the characteristics of the “new middle class.” The middle class, however, has undergone a categorical transformation from the old to the new middle-class, and furthermore, this transformation itself has signified the transition in social patterns from industrial to post-industrial society as well as economic globalization, both of which have contributed to the growth and global expansion of the middle class, having thus fundamentally renovated the middle class. | 周晓虹 | 2005 | 社会2005，25，4： | 26 |
| 20 | 他们不再是孩子了 关于“新失业群体”现状的社会学报告显示文摘The “New Unemployed” consists of young people with low education in the Chinese cities. They differ from the cohorts of their parents because they have no work experiences in any state- or collective-owned enterprise, and are subject to completely different policies designated by the government. Investigations of their daily living lead to the conclusion that the “New Unemployed” has gone through a “system withdrawal” process. They are now facing an environment of “system vacuum” that none of other unemployed groups has ever encountered before. The author emphasizes in the paper a strategic employment principle of “For Future Generations” so that focused attention and care can be provided and this toughest challenge in China can be dealt with. | 吕鹏 | 2005 | 社会2005，25，4： | 26 |
您所在的机构暂未开通此部分的功能，请联系管理员