检索结果-南通市图书馆

基于烟气重金属浓度在线监测的流化床蒸发动力学模型

在线全文

学校读者我要写书评

暂无评论

中国电机工程学报 2008年第11期28卷 1-5页

作者：刘晶 S.Abanades d.gauthier G.Flamant 郑楚光煤燃烧国家重点实验室(华中科技大学) 湖北省武汉市430074 CNRS-PROMES BP 50deilloFont-Romeu 66125France

应用改进的电感耦合等离子体发射光谱仪对烟气中重金属的相对浓度进行在线测量,以全面跟踪重金属的释放过程。在烟气重金属浓度实时监测基础上,发展动力学模型来研究重金属蒸发释放的动力学特性。应用矿物质基体氧化铝的实验结果来验证... 详细信息

应用改进的电感耦合等离子体发射光谱仪对烟气中重金属的相对浓度进行在线测量,以全面跟踪重金属的释放过程。在烟气重金属浓度实时监测基础上,发展动力学模型来研究重金属蒸发释放的动力学特性。应用矿物质基体氧化铝的实验结果来验证数学模型的有效性,理论模拟值与实验结果吻合较好。结果表明应用模型,将烟气重金属在线分析的实验结果作为输入参数,可用于预测重金属的蒸发率。根据重金属的蒸发率和固体颗粒中重金属浓度的关系得到其蒸发的动力学规律,对于氧化铝得到1级反应动力学规律。

关键词：重金属蒸发动力学模拟烟气流化床

在线全文

学校读者我要写书评

暂无评论

烟气中重金属浓度的在线测量

化工学报 2006年第9期57卷 2185-2188页

作者：刘晶郑楚光陆继东 S.Abanades d.gauthier G.Flamant 华中科技大学煤燃烧国家重点实验室 CNRS-PROMES BP5 Odeillo66125 Font-RomeuFrance

An inductively coupled plasma atomic emission spectrometer （ICP-AES） was developed to continuously measure the heavy metals concentrations in flue gas in order to track the metal release *** system is devoted to the thermal treatment of metal-spiked mineral matrix, coal and municipal solid wastes in fluidized bed （850℃）.This method was used to study the kinetics of heavy metals *** optimum values of the gas flows from the 1200 W power generator were 0.1 L·min -1 for the sample gas and 0.2 L·min -1 for *** the thermal treatment of coal and municipal solid waste,Cd and Pb were released readily,while Zn was released at a lower level than Cd and *** formation of stable compounds such as ZnO·Al2O3 and CdO·Al2O3 from the reaction of heavy metals with fly ash particles could decrease heavy metals *** all cases, the experimental setup was successfully used to monitor the heavy metal release process during coal and solid waste thermal treatment.

关键词：在线测量重金属烟气流化床

Probing top-quark couplings indirectly at Higgs factories

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2018年第12期42卷 53-65页

作者： gauthier durieux Jiayin Gu Eleni Vryonidou Cen Zhang dESY Notkestratle 85 D-22607HamburgGermany PRISMA Cluster of Excellence Institut ffir PhysikJohannes Gutenberg-Universitgt55099 MainzGermany Theoretical Physics department CERN1211 Geneva 23Switzerland Institute of High Energy Physics and School of Physical SciencesUniversity of Chinese Academy of SciencesBeijing 100049China

We perform a global effective-field-theory analysis to assess the combined precision of Higgs couplings, triple gauge-boson couplings, and top-quark couplings, at future circular e＋e- colliders, with a focus on runs below the tt-production threshold. deviations in the top-quark sector entering as one-loop corrections are consistently taken into account in the Higgs and diboson processes. We find that future lepton colliders running at center-of-mass energies below the tt production threshold can still provide useful information on top-quark couplings, by measuring virtual top-quark effects. With rate and differential measurements, the indirect individual sensitivity achievable is better than at the high-luminosity LHC. However, strong correlations between the extracted top-quark and Higgs couplings are also present and lead to much weaker global constraints on top-quark couplings. This implies that a direct probe of top-quark couplings above the t~ production threshold is also helpful for the determination of Higgs and triple-gauge-boson couplings. In addition, we find that below the e＋e- -＋tth production threshold, the top-quark Yukawa coupling can be determined by its loop corrections to all Higgs production and decay channels. degeneracy with the ggh coupling can be resolved, and even a global limit is competitive with the prospects of a linear collider above the threshold. This provides an additional means of determining the top-quark Yukawa coupling indirectly at lepton colliders.

关键词： effective field theory top quark lepton collider

Variation of a floral polymorphism at different spatial scales in the Mediterranean geophyte Narcissus assoanus

在线全文

学校读者我要写书评

暂无评论

Journal of Plant Ecology 2016年第3期9卷 333-345页

作者： Regina Berjano Perrine gauthier Chiara Parisi Valentine Vaudey Virginie Pons Alain Renaux david doblas John d.Thompson UMR 5175 Centre d’Ecologie Fonctionnelle et Evolutive CNRS1919 route de Mende34293 Montpellier cedex 5France departamento de Biología Vegetal y Ecología University of SevilleApdo 1095.41080 SevilleSpain

Aims Habitat fragmentation impacts the spatial extent and isolation of local populations and *** the biological consequences of these impacts have been well studied at the site level,effects directly related to changes in the spatial configuration of populations in the landscape remain less *** objective of this study is to examine how changes in the spatial-scale configuration of populations are associated with variability in morph rations in the floral polymorphic Mediterranean geophyte Narcissus *** We performed a nested analysis of morph ratio variation at three spatial scales:a 50×50 km regional scale in SE France,in fourteen 1×1 km landscapes located in the same region,and within 12 spatially extensive population *** also quantified variation in the behaviour of pollinators in population patches of contrasting spatial *** FindingsAt a regional scale,morph ratios show a geographic pattern of increasing isoplethy(1:1 morph ratio)away from centres of human population development and in upland *** the landscape scale,isoplethy of local population patches is more correlated with decreased isolation among patches than with patch ***,within local isoplethic populations,small patches can show significantly biased morph *** small isolated patches,pollinators perform shorter flight distances among consecutive flower visits than in spatially extensive *** study of variation in a genetic polymorphism at multiple spatial scales provides new insights into the scale-dependent effects of habitat fragmentation and the potential occurrence of metapopulation dynamics in natural plant populations.

关键词： flower polymorphism habitat fragmentation Mediterranean Narcissus stigma-height polymorphism

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

流化床内重金属蒸发特性的动力学模型

工程热物理学报 2009年第2期30卷 347-349页

作者：刘晶 d.gauthier S Abanades G Flamant 郑楚光华中科技大学煤燃烧国家重点实验室 CNRS-PROMES BP 5 Odeillo 66125 Font-Romeu France

在流化床内煤燃烧烟气中重金属浓度的实时监测基础上,发展动力学模型来研究重金属蒸发释放的动力学特性。该方法包括出口烟气中的重金属浓度变化的实验数据和一个反应器尺度的模型。在反应器的气体出口安装了在线分析系统,该在线分析系... 详细信息

在流化床内煤燃烧烟气中重金属浓度的实时监测基础上,发展动力学模型来研究重金属蒸发释放的动力学特性。该方法包括出口烟气中的重金属浓度变化的实验数据和一个反应器尺度的模型。在反应器的气体出口安装了在线分析系统,该在线分析系统可连续测量烟气中的重金属浓度变化规律。将烟气重金属在线分析的实验结果作为模型的输入参数,根据重金属的蒸发率和固体颗粒中重金属浓度的关系得到其蒸发的动力学规律,对于煤得到2级反应动力学规律。

关键词：重金属煤流化床烟气蒸发

Have some landscapes in the eastern Canadian boreal forest moved beyond their natural range of variability?

在线全文

学校读者我要写书评

暂无评论

Forest Ecosystems 2018年第4期5卷 412-428页

作者： Pierre Grondin Sylvie gauthier Veronique Poirier Patrice Tardif Yan Boucher Yves Bergeron direction de la Recherche Forestiere Ministere des Foretsde la Faune et des Pares (MFFP)2700rue EinsteinQuebecQC GIP 3W8Canada Ressources Naturelles Canada/Natural Resources Canada Service Canadien des forets/Canadian Forest ServiceCentre de foresterie des Laurentides/Laurentian Forestry Center1055 rue du P.E.P.SQuebecQC G1V 4C7 Canada Institut de Recherche sur les Forets Universite du Quebec en Abitibi-Temiscamingue445boul.de I'UniversiteRouyn-NorandaQC J9X 5E4Canada Centre d'etude de la Foret Universite du QuebecMontreal CP 8888succ AMontrealQC H3C 3P8Canada

Background: In the contxt of ecosystem management, the present study aims to compare the natural and the present-day forested landscapes of a large territory in Quebec(Canada). Using contemporary and long-term fire cycles, each natural forst landscape is defined according to the variability of its structure and composition, and compared to the present-day landscape. This analysis was conducted to address the question of whether human activities have moved these ecosystems outside the range of natural landscape ***: The study encompassed a forested area of 175 000 km2 divided into 14 landscapes. Using a framework that integrates fire cycles, age structure and forest dynamics, we characterized the forest composition and age structures that resulted from three historical fire cycles(110,140, and 180 years) representative of the boreal forest of eastern Canada. The modeled natural landscapes were compared with present-day landscapes in regard to the proportion of old-growth forests(landscape level) and the proportion of late-successional forest stands(landscape level and potential vegetation type).Results: Four landscapes(39%) remain within their natural range of variability. In contrast, nine landscapes(54%)show a large gap between natural and present-day landscapes. These nine are located in the southern portion of the study area, and are mainly associated with Abies-Betula vegetation where human activities have contributed to a strong increase in the proportion of Populus tremuloides stands(early-successional stages) and a decrease of oldgrowth forest stands(more than 100 years old). A single landscape(7%), substantially changed from its potential natural state, is a candidate for adaptive-based ***: Comparison of corresponding natural(reference conditions) and present-day landscapes showed that ten landscapes reflecting an important shift in forest composition and age structure could be considered beyond the range of their natural v

关键词： Ecosystem management Reference conditions Natural variability Resilience Fire cycle Age structure Forest dynamics Potential vegetation type Landscape ecology Theoretical natural landscape Present-day landscape

Fading indirect effects in a warming arctic tundra

在线全文

学校读者我要写书评

暂无评论

Current Zoology 2014年第2期60卷 189-202页

作者： Joēl BETY Maude GRAHAM-SAUVE Pierre LEGAGNEUX Marie-Christine CAdIEUX Gilles gauthier Centre d'études nordiques et d6partement de biologie Universit6 du Québec à Rimouski 300 All6e des Ursulines Rimouski Qu6bec Canada G5L 3Al Centre d'études nordiques et département de biologie Pavilion Vachon Université Laval Qu6bec Qu6bec Canada G 1K 7P4

Indirect interactions in food webs can strongly influence the net effect of global change on ecological communities yet they are rarely quantified and hence remain poorly understood. Using a 22-year time series, we investigated climate-induced and predator-mediated indirect effects on grazing intensity in the tundra food web of Bylot Island, which experienced a warming trend over the last two decades. We evaluated the relative effects of environmental parameters on the proportion of plant biomass grazed by geese in wetlands and examined the temporal changes in the strength of these cascading effects. Migrating geese are the dominant herbivores on Bylot Island and can consume up to 60% of the annual production of wetland graminoids. Spring North Atlantic Oscillation, mid-summer temperatures and summer abundance of lemmings （prey sharing predators with geese） best-explained annual variation in grazing intensity. Goose grazing impact increased in years with high temperatures and high lemming abundance. However, the strength of these indirect effects on plants changed over time. Grazing intensity was weakly explained by environmental factors in recent years, which were marked by a sharp increase in plant primary production and steady decrease in grazing pressure. Indirect effects do not seem to be reversing the direct positive effect of warming on wetland plants. We suggest that cascading effects on plants may lag considerably behind direct effects in vertebrate dominated arctic communities, especially where key herbivore populations are strongly affected by factors outside of the Arctic [Current Zoology 60 （2）： 189-202, 2014].

关键词： Climate change Herbivore-mediated effects Tundra food web Trophic cascade Grazing Goose

Generating Net Forces from Backgrounds of Randomly Created Waves

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

Journal of Modern Physics 2014年第16期5卷 1569-1574页

作者： Claude gauthier département de Mathématiques et de Statistique Université de Moncton Moncton Canada

We examine the possibility of generating net forces on concave isolated objects from backgrounds consisting of randomly created waves carrying momentum. This issue is examined first for waves at the surface of a liquid, and second for quantum vacuum electromagnetic waves, both in relation with a one-side-open rectangular structure whose interior embodies a large number of parallel reflecting plates. Using known results about the Casimir-like effect and the original Casimir effect for parallel plates, we explain why and how such rectangular hollow structures should feel net oriented forces. We briefly describe real systems that would allow testing these theoretical results.

关键词： Casimir Effect and Analogs Vacuum Energy Propulsion drive

Alzheimer’s disease: current status and perspective

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

Science Bulletin 2022年第24期67卷 2494-2497页

作者： Wenying Liu Serge gauthier Jianping Jia Innovation Center for Neurological disorders and department of Neurology Xuanwu HospitalCapital Medical UniversityNational Clinical Research Center for Geriatric DiseasesBeijing 100053China departments of Neurology and Neurosurgery and Department of PsychiatryMcGill Centre for Studies in AgingMcGill UniversityMontreal H4H1R3Canada Beijing Key Laboratory of Geriatric Cognitive disorders Beijing 100053China Clinical Center for Neurodegenerative disease and Memory Impairment Capital Medical UniversityBeijing 100053China Center of Alzheimer’s disease Beijing Institute of Brain DisordersCollaborative Innovation Center for Brain DisordersCapital Medical UniversityBeijing 100053China Key Laboratory of Neurodegenerative diseases Ministry of EducationBeijing 100053China

Aging is an undeniable fact of life and the global population is aging to a historically unprecedented degree. The population aged65 years or older comprises 750 million people, representing nearly 10%of the global population. As a result of prolonged life expectancy and falling mortality rates, China has become one of the most rapidly aging countries in the world, even surpassing several high-income countries in North America and Europe.

关键词：阿尔茨海默病 income representing