检索结果-南通市图书馆

维普期刊数据库博看期刊

Effect of rotating gliding discharges on the lean blow-off limit of biogas flames

在线全文

学校读者我要写书评

暂无评论

Plasma Science and Technology 2024年第10期26卷 116-122页

作者： Muhammad Saqib AKHTAR Mhedine ALICHERIF Bing WANG Deanna A.lacoste School of Aerospace Engineering Tsinghua UniversityBeijing 10084People’s Republic of China King Abdullah University of Science and Technology Physical Science and Engineering DivisionClean Combustion Research CenterThuwal 23955-6900Saudi Arabia

This study investigates the effect of a rotating gliding discharge on synthetic biogas combustion at atmospheric *** biogas was produced by mixing methane and carbon *** mixtures were considered:100%/0%,70%/30%,and 50%/50%of methane and carbon dioxide,*** plasma effect was investigated in a low-swirl-number burner equipped with a high-voltage electrode to produce gliding *** effect of plasma on the stability limits of the flame is reported for several electrical *** plasma-assisted combustion,the lean blow-off limits of biogas-air flames were significantly improved,which agrees with what can be found in the literature for other *** electrical parameters of the discharge and the plasma emissions were measured using electric probes and emission spectroscopy,*** mixture with the CO_(2)dilution was associated with a higher reduced electric field and higher ion production.A better understanding of the excited-species concentration evolution during plasma is necessary and will be investigated in future work.

关键词： plasma-assisted combustion non-equilibrium plasma methane carbon dioxide

Theoretical model of current propagation in a helical coil with varying geometry and screen tube

在线全文

学校读者我要写书评

暂无评论

Matter and Radiation at Extremes 2024年第6期9卷 29-42页

作者： C.L.C.lacoste A.Hirsch-Passicos E.d'Humières V.T.Tikhonchuk P.Antici M.Bardon CEA-CESTA Le Barp 33114France CELIA University of Bordeaux-CNRS-CEATalence 33405France INRS EMT VarennesQuebec J3X 1P7Canada Extreme Light Infrastructure ERIC ELI-Beamlines FacilityDolnìBˇreˇzany 25142Czech Republic

An analytical model of current propagation in a helical coil with varying geometry is *** can be used for post-acceleration and post-focusing of ions produced via laser-driven target normal sheath acceleration and generation of electromagnetic *** calculate the current that propagates in a helical coil and suggest a method for improving its dispersion properties using a screening tube and with pitch and radius *** electromagnetic fields calculated with the analytical model are in agreement with particle-in-cell *** model provides insights into the physics of current propagation in helical coils with varying geometries and enables a numerical implementation for rapid proton spectrum computations,which facilitate the design of such coils for future experiments.

关键词： helical propagation geometry

在线全文

学校读者我要写书评

暂无评论

大尺度热声发动机的关键问题研究

工程热物理学报 2023年第8期44卷 2059-2067页

作者：罗靖陈燕燕张丽敏孙岩雷罗二仓 lacoste Deanna 中国科学院理化技术研究所低温工程学重点实验室北京100190 中国科学院大学北京100049 阿卜杜拉国王科技大学清洁燃烧研究中心沙特阿拉伯图瓦尔23955

本文针对液氢储罐零蒸发需求,探讨热声发动机驱动300 W@20 K低温制冷机的可行性及所需解决的关键问题。首先利用SAGE对热声驱动脉管制冷机系统进行整机一维模拟计算和优化设计,获得系统结构参数与热力性能,再采用CFD方法针对大尺度热声... 详细信息

本文针对液氢储罐零蒸发需求,探讨热声发动机驱动300 W@20 K低温制冷机的可行性及所需解决的关键问题。首先利用SAGE对热声驱动脉管制冷机系统进行整机一维模拟计算和优化设计,获得系统结构参数与热力性能,再采用CFD方法针对大尺度热声发动机的复杂流动和换热问题进行二维仿真,旨在阐明实际系统中存在的关键问题并提出相应解决措施。结果表明,热缓冲管在冷热混合损失中起到最为关键的作用,去除次水冷器对于抑制热缓冲管中的局部二次流从而降低冷热混热损失效果明显,同时其内部速度场的分布还对Gedeon直流具有一定的调节作用。此外,本文还讨论了大尺度热声发动机中的余热利用换热器与承压壳热应力等问题。

关键词：大尺度热声发动机直流二次流 CFD仿真

在线全文

学校读者我要写书评

暂无评论

液氢无损储存回热式热驱动制冷机的数值模拟

工程热物理学报 2023年第1期44卷 38-46页

作者：罗靖陈燕燕张丽敏王晓涛孙岩雷罗二仓 lacoste Deanna 中国科学院理化技术研究所低温工程学重点实验室北京100190 中国科学院大学北京100049 King Abdullah University of Science and Technology Clean Combustion Research Center Thuwal 23955Saudi Arabia

本文针对液氢储罐零蒸发需求,利用SAGE软件对300 W@20 K回热式热驱动制冷机系统开展了模拟计算和优化设计,验证了双效自由活塞斯特林制冷机和热声驱动脉管制冷机两种方案用于液氢无损储存系统的可行性。结果表明,在平均压力5 MPa,工作频... 详细信息

本文针对液氢储罐零蒸发需求,利用SAGE软件对300 W@20 K回热式热驱动制冷机系统开展了模拟计算和优化设计,验证了双效自由活塞斯特林制冷机和热声驱动脉管制冷机两种方案用于液氢无损储存系统的可行性。结果表明,在平均压力5 MPa,工作频率50 Hz,加热温度500℃的工况下,双效自由活塞斯特林制冷机的整机[火用]效率可达到19.4%,而热声驱动脉管制冷机为14.3%。但斯特林系统由于采用定参数谐振活塞耦合,难以实现多工况匹配,导致其对平均压力、加热温度等运行参数的变化十分敏感。相比之下,热声系统完全无运动部件,具有极佳的工况适应性,因此热声驱动脉管制冷机系统在液氢无损储存应用领域将是一种颇具潜力的解决方案。

关键词：液氢零蒸发回热式热驱动制冷机 [火用]效率敏感性分析数值模拟

Oxidation, Chain Scission and Cross-Linking Studies of Polysiloxanes upon Ageings

在线全文

学校读者我要写书评

暂无评论

Open Journal of Organic Polymer Materials 2012年第2期2卷 13-22页

作者： Namrata S. Tomer Florence Delor-Jestin Lawrence Frezet Jacques lacoste Clermont Université ENSCCF-LPMM Clermont-Ferrand France Clermont Université Université Blaise Pascal LPMM UMR CNRS 6505 Clermont-Ferrand France

The comparison between physical properties and chemical structures of several polysiloxanes was studied at initial state and upon ageings. Techniques such as densimetry, gel permeation chromatography, FTIR spectroscopy, thermogravim- etric analysis coupled with IR spectroscopy and the new tool photo-DSC were used to give assessments of average mo- lecular weight, chemical evolution, cristallinity and thermal stability. Different types of ageing such as thermal ageing (60?C and 100?C), photo-ageing and acid vapour ageing were performed. After ageing we observed an evolution of chemical structures and physical properties for all samples. The main pathway of degradation is given for each sample. It results in oxidation, chain scission or cross-linking. Cross-linking levels are dependant on the type of ageing, the chemical structure and the initial rate of cristallinity. Cross-linking reactions are favoured after photo-ageing. Oxidation is higher for polysiloxane with aliphatic carbon chain.

关键词： Polysiloxane Degradation Thermal Properties Cross-Linking Cristallinity

Hand-feel soil texture observations to evaluate the accuracy of digital soil maps for local prediction of soil particle size distribution:A case study in Central France

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

Pedosphere 2023年第5期33卷 731-743页

作者： Anne C.RICHER-de-FORGES Dominique ARROUAYS Laura POGGIO Songchao CHEN Marine lacoste Budiman MINASNY Zamir LIBOHOVA Pierre ROUDIER Vera LMULDER HervéNÉDÉLEC Guillaume MARTELET Blandine LEMERCIER Philippe LAGACHERIE Hocine BOURENNANE INRAE(Institut national de recherche pour l'agriculture l'alimentation et l'environnement)Info&Sols UnitOrléans 45075France ISRIC(International Soil Reference and Information Centre)Wageningen P.O.Box 353Wageningen 6700The Netherlands Zhejiang University-Hangzhou Global Scientific and Technological Innovation Center Hangzhou 311200China The University of Sydney Sydney Institute of Agriculture.Eveleigh NSW 2015Australia The University of Sydney School of Life and Environmental SciencesEveleigh NSW 2015Australia USDA-ARS(United States Department of Agriculture-Agricultural Research Service) Dale Bumpers Small Farms Research Center6883 S.State Hwy.23Booneville AR 72927USA Landcare Research-Manaaki Whenua Palmerston North 4442New Zealand Soil Geography and Landscape Group Wageningen UniversityP.O.Box 47Wageningen 6700The Netherlands Chambre d'Agriculture du Loiret Orléans F-45000France Bureau de Recherches Géologiques et Minières BP 36009Orléans cedex 2Orléans 45060France UMR SAS(UnitéMixte de Recherche"Sol Agro et hydrosystème Spatialisation")Institut Agro INRAERennes F-35000France UMR LISAH(UnitéMixte de Recherche"Laboratoire d'Etude des Interactions entre Sol-Agrosystème-Hydrosystème") INRAEInstitut AgroIRD(Institut de Recherche pour le Développement)Montpellier F-34000France

Digital maps of soil properties are now widely ***-users now can access several digital soil mapping(DSM)products of soil properties,produced using different models,calibration/training data,and covariates at various spatial scales from global to ***,there is an urgent need to provide easy-to-understand tools to communicate map uncertainty and help end-users assess the reliability of DSM products for use at local *** this study,we used a large amount of hand-feel soil texture(HFST)data to assess the performance of various published DSM products on the prediction of soil particle size distribution in Central *** tested four DSM products for soil texture prediction developed at various scales(global,continental,national,and regional)by comparing their predictions with approximately 3200 HFST observations realized on a 1:50000 soil survey conducted after release of these DSM *** used both visual comparisons and quantitative indicators to match the DSM predictions and HFST *** comparison between the low-cost HFST observations and DSM predictions clearly showed the applicability of various DSM products,with the prediction accuracy increasing from global to regional *** simple evaluation can determine which products can be used at the local scale and if more accurate DSM products are required.

关键词： digital soil mapping products easy-to-understand tool hand-feel observation local use map uncertainty prediction performance spatial extent visual assessment

Plasma 17-hydroxyprogesterone/cortisol ratio is not a predictor of systemic hypotension in extremely premature infants

在线全文

学校读者我要写书评

暂无评论

Open Journal of Pediatrics 2013年第2期3卷 78-84页

作者： Aurelie lacoste Jean-Benoit Corcuff Antoine Benard Sandy Leproust Fabienne Nacka Olivier Brissaud Pascal Barat Département de Pédiatrie Endocrinologie PédiatriqueCentre Hospitalier Universitaire BordeauxBordeauxFrance Département de Médecine Nucléaire Centre Hospitalier Universitaire BordeauxBordeauxFrance Nutrition et Neurobiologie Intégrée Universitaire de BordeauxBordeauxFrance Pole de Sante Publique Centre Hospitalier Universitaire BordeauxBordeauxFrance Département de Pédiatrie Centre d’Investigation Clinique(CIC 0005)Centre Hospitalier Universitaire de BordeauxBordeauxFrance CHU de bordeaux Département de PédiatrieRéanimation PédiatriqueCentre Hospitalier Universitaire de BordeauxBordeauxFrance

Background/aims: To determine whether the 17-hydroxyprogesterone (17-OHP)/cortisol ratio as a marker of immature11-beta hydroxylase activity can predict severe systemic hypotension in preterm neonates. Methods: Serum cortisol and 17-OHP concentrations were measured in capillary blood deposited on blotter paper on day 3 post-natal age (Day 3) in infants less than 32 weeks postmenstrual age (PMA). The predictive value of 17-OHP/cortisol ratio for a first episode of systemic hypotension occurring after Day 3 (FESH) was evaluated. Results: Of 105 infants included, 14 patients (13%) presented a FESH. Neither the 17-OHP/cortisol ratio, nor the 17-OHP or cortisol concentrations were associated with the occurrence of a FESH when adjusted for potential confounding factors. 17-OHP and cortisol were inversely associated to PMA (r = ﹣0.36 and ﹣0.40, respectively). Cortisol, but not 17-OHP, was associated with the type of hospitalization unit, the respiratory support and the presence of a patent ductus arteriosus. The 17-OHP/cortisol ratio was associated with the type of hospitalization unit only. Conclusions: The 17-OHP/ cortisol ratio at Day 3 did not predict the occurrence of a first episode of systemic hypotension after Day3 inpreterm neonates.

关键词： Relative Adrenal Insufficiency Immaturity Congenital Adrenal Hyperplasia Screening Program

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

小象

英语大王 2012年第Z2期 14-17页

作者： Inga Surprenant Gary lacoste 不详

猴子问了小象一个问题:"你为什么有两条尾巴?"这个问题真让小象百思不得其解。难道小象真的有两条尾巴吗?

关键词：小象妈妈猴子

超声引导下的高强度聚焦超声作为一种有前景的无创性方法治疗原发性甲状旁腺功能亢进症

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

国际医学放射学杂志 2014年第6期 593-593页

作者： R.Kovatcheva J.Vlahov J.Stoinov F.lacoste C.Ortun K.Zaletel 杜明珊 Department of Thyroid and Metabolic Bone Disorders University Hospital of EndocrinologySofia Medical University2Zdrave street1431 SofiaBulgaria

摘要目的研究超声引导下的高强度聚焦超声(HIFU)治疗原发性甲状旁腺功能亢进症(PHPT)的长期疗效和安全性。方法本前瞻性研究在72例PHPT病人中筛查出13例

关键词：原发性甲状旁腺功能亢进症 HIFU 高强度聚焦超声超声引导下无创性