检索结果-南通市图书馆

Atmospheric and Oceanic Science Letters 2016年第1期9卷 45-51页

作者： HE bian State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric PhysicsChinese Academy of Sciences Key Laboratory of Meteorological Disaster of Ministry of Education Nanjing University of Information Science and Technology

Based on a series of aqua-planet and air–sea coupled experiments,the influence of unrealistic treatment of water substance in the Flexible Global Ocean–Atmosphere–Land System Model,spectral version 2（FGOALS-s2）,on the model＇s climate sensitivity is investigated in this *** the model does not adopt an explicit microphysics scheme,the detrained water substance from the convection scheme is converted back to the *** procedure could lead to an additional increase of water vapor in the atmosphere,which could strengthen the model＇s climate *** sensitivity experiments confirm this *** removing the water vapor converted from the detrained water substance,the water vapor reduced significantly in the upper troposphere and the high clouds also *** calculations show that the water vapor reduced almost 10% of the total water vapor,and 50% at 150 h Pa,when the detrained water substance was removed,contributing to the 30% atmospheric surface temperature *** study calls for an explicit microphysics scheme to be introduced into the model in order to handle the detrained water vapor and thus improve the model＇s simulation skill.

关键词： FGOA Ls-s2 climate sensitivity cloud radiation global warming

Presenting Little q-Schur Algebras uk（2, r）

在线全文

学校读者我要写书评

暂无评论

Algebra Colloquium 2017年第2期24卷 297-308页

作者： Zhihao bian Mingqiang Liu Department of Mathematics Tongji University Shanghai 200092 China Department of Mathematics China Three Gorges University Vichang Hubei 443002 China

Little q-Schur algebras were introduced as homomorphic images of the infinitesimal quantum groups by Du, Fu and Wang. In this paper, we obtain a presentation by generators and relations for little q-Schur algebras uk... 详细信息

关键词： little q-Schur algebras q-Schur algebras generators and relations

Tracing the Boundary Layer Sources of Carbon Monoxide in the Asian Summer Monsoon Anticyclone Using WRF-Chem

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advances in Atmospheric Sciences 2015年第7期32卷 943-951页

作者： YAN Renchang bian Jianchun Key Laboratory of Middle Atmosphere and Global Environment Observation Institute of Atmospheric PhysicsChinese Academy of Sciences

The Asian summer monsoon （ASM） anticyclone is a dominant feature of the circulation in the upper troposphere- lower stratosphere （UTLS） during boreal summer, which is found to have persistent maxima in carbon monoxide （CO）. This enhancement is due to the upward transport of air with high CO from the planetary boundary layer （PBL）, and confinement within the anticyclonic circulation. With rapid urbanization and industrialization, CO surface emissions are relatively high in the ASM region, especially in India and East China. To reveal the transport pathway of CO surface emissions over these two regions, and investigate the contribution of these to the CO distribution within the ASM anticyclone, a source sensitivity experiment was performed using the Weather Research and Forecasting （WRF） with chemistry model （WRF- Chem）. According to the experiment results, the CO within the ASM anticyclone mostly comes from India, while the contribution from East China is insignificant. The result is mainly caused by the different transportation mechanisms. In India, CO transportation is primarily affected by convection. The surface air with high CO over India is directly transported to the upper troposphere, and then confined within the ASM anticyclone, leading to a maximum value in the UTLS region. The CO transportation over East China is affected by deep convection and large-scale circulation, resulting mainly in transportation to Korea, Japan, and the North Pacific Ocean, with little upward transport to the anticyclone, leading to a high CO value at 215 hPa over these regions.

关键词： Asian summer monsoon anticyclone surface emission convection

Well-posedness for compressible Rayleigh-Benard convection

在线全文

学校读者我要写书评

暂无评论

Frontiers of Mathematics in China 2013年第6期8卷 1253-1264页

作者： Dongfen bian Boling GUO The Graduate School of China Academy of Engineering Physics Beijing 100088 China Institute of Applied Physics and Computational Mathematics Beijing 100088 China

The Rayleigh-B^nard convection is a classical problem in fluid dynamics. In this paper, we are concerned with the well-posedness for the compressible Rayleigh-B^nard convection in a bounded domain Ω R2. We prove the local well-posedness of the system with appropriate initial data. This is the result concerning compressible Rayleigh-B^nard convection, before only results about incompressible Rayleigh-B^nard convection were done.

关键词： Compressible Rayleigh-BSnard convection well-posedness energy method

Observation of a Summer Tropopause Fold by Ozonesonde at Changchun,China:Comparison with Reanalysis and Model Simulation

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advances in Atmospheric Sciences 2015年第10期32卷 1354-1364页

作者： LI Dan bian Jianchun Key Laboratory of Middle Atmosphere and Global Environment Observation Institute of Atmospheric PhysicsChinese Academy of Sciences College of Earth Science University of Chinese Academy of Sciences

Tropopause folds are one of the key mechanisms of stratosphere-troposphere exchange （STE） in extratropical regions, transporting ozone-rich stratospheric air into the middle and lower troposphere. Although there have been many studies of tropopause folds that have occurred over Europe and North America, a very limited amount of work has been carried out over northeastern Asia. Ozonesondes produced by the Institute of Atmospheric Physics were launched in Changchun （43.9°N, 125.2° E）, Northeast China, in June 2013, and observed an ozone-enriched layer with thickness of 3 km and an ozone peak of 180 ppbv at 6 km in the troposphere. The circulation field from the European Centre for Medium-Range Weather Forecasts Interim Reanalysis （ERA-Interim） dataset shows that this ozone peak was caused by a tropopause fold associated with a jet stream at the eastern flank of the East Asian trough. By analyzing the ozone data from the ozone monitoring instrument and Weather Research and Forecasting model with Chemistry （WRF-Chem） simulations, it was found that a high ozone concentration tongue originating from the lower stratosphere at high latitude （near central Siberia） intruded into the middle troposphere over Changchun between 5 and 8 km on 12 June 2013. The high-resolution WRF-Chem simulation was capable of describing events such as the tropopause fold that occurred on the cyclonic shear side of the jet stream. In addition, the TRAJ3D trajectory model was used to trace the origin of measured secondary ozone peaks in the middle troposphere back, for example, to stratospheric intrusion through the tropopause fold.

关键词： tropopause fold ozonesonde WRF-Chem model stratospheric intrusion

在线全文

学校读者我要写书评

暂无评论

四川凉山州西南低涡型暖区暴雨的统计特征

西华师范大学学报（自然科学版） 2025年第1期46卷 58-64页

作者：边茜李春忱四川省凉山州气象局四川凉山615000

利用凉山州近10年4—10月的降水资料、常规地面观测、高空观测、ERA5再分析资料和FY-2G卫星TBB资料,对四川省凉山州西南低涡型区域性暖区暴雨进行统计分析和天气学分析。结果表明:(1)凉山州西南低涡型暖区暴雨的发生频率在年际变化上呈... 详细信息

利用凉山州近10年4—10月的降水资料、常规地面观测、高空观测、ERA5再分析资料和FY-2G卫星TBB资料,对四川省凉山州西南低涡型区域性暖区暴雨进行统计分析和天气学分析。结果表明:(1)凉山州西南低涡型暖区暴雨的发生频率在年际变化上呈波动趋势,2016年和2022年发生频率最高,2017年最低;暴雨主要发生在夏季(6—8月),其中7月发生的频率最高;暴雨具有短时强降水特征,强降水常出现在傍晚到夜间,白天降水强度减弱。(2)暴雨发生在高能高湿的不稳定层结中,其水汽主要来源于孟加拉湾。(3)影响凉山州的西南低涡主要生成于川西高原南部到凉山州西北部,少数生成于四川盆地西南部到凉山州西北部,极少数生成于攀西地区西南部,故川西高原南部是凉山州西南低涡型暖区暴雨对流云团的主要发源地。(4)西南低涡暴雨对流云团常由块状和带状混合影响,影响范围广;暴雨区常出现在低涡中心或外围东南侧,降水成片集中。

关键词：凉山州西南低涡暖区暴雨高能高湿对流云团

CO2 methanation and co-methanation of CO and CO2 over Mn-promoted Ni/Al2O3 catalysts

在线全文

学校读者我要写书评

暂无评论

Frontiers of Chemical Science and Engineering 2016年第2期10卷 273-280页

作者： Kechao Zhao Zhenhua Li Li bian Key Laboratory for Green Chemical Technology of Ministry of Education Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) School of Chemical Engineering and Technology Tianjin University Tianjin 300072 China College of Science Hebei University of Engineering Handan 056038 China

A series of Mn-promoted 15 wt-% Ni/Al2O3 catalysts were prepared by an incipient wetness impreg- nation method. The effect of the Mn content on the activity of the Ni/Al2O3 catalysts for CO2 methanation and the co- methanation of CO and CO2 in a fixed-bed reactor was investigated. The catalysts were characterized by N2 physisorption, hydrogen temperature-programmed reduc- tion and desorption, carbon dioxide temperature-pro- grammed desorption, X-ray diffraction and high- resolution transmission electron microscopy. The presence of Mn increased the number of CO2 adsorption sites and inhibited Ni particle agglomeration due to improved Ni dispersion and weakened interactions between the nickel species and the support. The Mn-promoted 15 wt-% Ni/ Al2O3 catalysts had improved CO2 methanation activity especially at low temperatures （250 to 400 ℃）. The Mn content was varied from 0.86% to 2.54% and the best CO2 conversion was achieved with the 1.71Mn-Ni/Al2O3 catalyst. The co-methanation tests on the 1.71Mn-Ni/ Al2O3 catalyst indicated that adding Mn markedly enhanced the CO2 methanation activity especially at low temperatures but it had little influence on the CO methanation performance. CO2 methanation was more sensitive to the reaction temperature and the space velocity than the CO methanation in the co-methanation process.

关键词： Mn promotion nickel catalysts C02 metha-nation co-methanation of CO and CO2

Enabling technology and core theory of synthetic biology

在线全文

学校读者我要写书评

暂无评论

Science China(Life Sciences) 2023年第8期66卷 1742-1785页

作者： xian-En Zhang Chenli Liu Junbiao Dai Yingjin Yuan Caixia Gao Yan Feng bian Wu Ping Wei Chun You Xiaowo Wang Tong Si Faculty of Synthetic Biology Shenzhen Institute of Advanced TechnologyShenzhen 518055China Institute of Synthetic Biology Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China National Laboratory of Biomacromolecules Institute of BiophysicsChinese Academy of SciencesBeijing 100101China Frontiers Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering(Ministry of Education) School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China State Key Laboratory of Plant Cell and Chromosome Engineering Institute of Genetics and Developmental BiologyChinese Academy of SciencesBeijing 100101China State Key Laboratory of Microbial Metabolism Shanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Microbial Resources Institute of MicrobiologyChinese Academy of SciencesBeijing 100101China Tianjin Institute of Industrial Biotechnology Chinese Academy of SciencesTianjin 300308China Ministry of Education Key Laboratory of Bioinformatics Center for Synthetic and Systems BiologyBioinformatics DivisionBeijing National Research Center for Information Science and TechnologyDepartment of AutomationTsinghua UniversityBeijing 100084China

Synthetic biology provides a new paradigm for life science research(“build to learn”)and opens the future journey of biotechnology(“build to use”).Here,we discuss advances of various principles and technologies in the mainstream of the enabling technology of synthetic biology,including synthesis and assembly of a genome,DNA storage,gene editing,molecular evolution and de novo design of function proteins,cell and gene circuit engineering,cell-free synthetic biology,artificial intelligence(AI)-aided synthetic biology,as well as *** also introduce the concept of quantitative synthetic biology,which is guiding synthetic biology towards increased accuracy and predictability or the real rational *** conclude that synthetic biology will establish its disciplinary system with the iterative development of enabling technologies and the maturity of the core theory.

关键词： synthetic biology quantitative synthetic biology genome synthesis and assembly DNA storage molecular evolution de novo design computer-aided design cell engineering gene circuit chassis cell artificial intelligent(AI) biofoundry

Effects of chemical,mineralogical,and temperature variations on the density and bulk sound velocity of the bottom lower mantle

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2016年第10期59卷 2062-2077页

作者： bian Hui SUN NingYu MAO Zhu Laboratory of Seismology and Physics of Earth's Interior School of Earth and Planetary SciencesUniversity of Science and Technology of ChinaHefei 230026China National Geophysics Observatory at Mengcheng Mengcheng 233500China

In this study, we have modeled the density （p） and bulk sound velocity （V.） profiles of the bottom lower mantle using the experimental thermal equation of state （EoS） parameters of lower-mantle minerals, including bridgmanite, ferropericlase, CaSiO3-perovskite, and post-perovskite. We re-evaluated the literature pressure-volume-temperature relationships of these minerals using a self-consistent pressure scale in order to avoid the long-standing pressure scale problem and to provide more reliable constraints on the thermal EoS parameters. With the obtained thermal EoS parameters, we have constructed the p and V. profiles of the bottom lower mantle in different composition, mineralogy, and temperature models. Our modelling results show that the variations of chemistry, mineralogy, and temperature and AI enrichment at the bottom lower mantle can cause an increase have different seismic signatures from each other. The Fe in p but greatly lower V.. A change in mineralogy needs to be considered with the lateral variation in temperature. The cold slabs will be shown as denser regions compared to the normal mantle because of the combined effect of a lower temperature and the presence of a denser post-perovskite at a shallower depth, whereas the hot regions will have a 1-2% lower p than the normal mantle. V, of both cold slabs and hot regions will he lower than the normal mantle when bridgmanite is the dominant phase in the normal mantle, yet they will be greater once bridgmanite transforms into post-perovskite in the normal mantle. Our modeling also shows that the presence of a （Fe, Al）-enriched bridgmanite thermal pile above the core-mantle boundary will exhibit a seismic signature of enhancedp and V., but a reduced Vs, which is consistent with the observed seismic anomalies in the large-low-shear-velocity-provinces （LLSVPs）. The existence of such a （Fe, A1）-enriched bridgmanite thermal pile thus can help to understand the origin of the LLSVPs. These results provide new in

关键词： Bottom lower mantle Density Bulk sound velocity Chemical heterogeneity Temperature

Relay-Switching-Based Fixed-Time Tracking Controller for Nonholonomic State-Constrained Systems:Design and Experiment

在线全文

学校读者我要写书评

暂无评论

IEEE/CAA Journal of Automatica Sinica 2023年第8期10卷 1778-1780页

作者： Zhongcai Zhang Jinshan bian Kang Wu the School of Engineering Qufu Normal UniversityRizhao 276826China the School of Internet of Things Engineering Jiangnan UniversityWuxi 214122China

Dear Editor,This letter investigates the fixed-time trajectory tracking controller design for nonholonomic chained systems with static state ***,a fixed-time tracking control law is given to carry out relay switching,... 详细信息

关键词： Fixed letter nonholonomic