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Inverse analysis of coupled carbon-nitrogen cycles against multiple datasets at ambient and elevated cO_(2)

Journal of Plant Ecology 2016年第3期9卷 285-295页

作者： Zheng Shi Yuanhe Yang Xuhui Zhou Ensheng Weng adrien c.finzi Yiqi Luo Department of Botany and Microbiology University of OklahomaNormanOK 73019USA State Key Laboratory of Vegetation and Environmental change Institute of BotanyChinese Academy of SciencesBeijing 100093China Department of Biology Boston UniversityBostonMA 02215USA

Aims carbon(c)sequestration in terrestrial ecosystems is strongly regulated by nitrogen(N)***,key parameters that determine the degree of N regulation on terrestrial c sequestration have not been well *** Here,we used a Bayesian probabilistic inversion approach to estimate 14 target parameters related to ecosystem c and N interactions from 19 datasets obtained from Duke Forests under ambient and elevated carbon dioxide(cO_(2)).Important FindingsOur results indicated that 8 of the 14 target parameters,such as c:N ratios in most ecosystem compartments,plant N uptake and external N input,were well constrained by available datasets whereas the others,such as N allocation coefficients,N loss and the initial value of mineral N pool were poorly *** analysis showed that elevated cO_(2)led to the increases in c:N ratios in foliage,fine roots and ***,elevated cO_(2)stimulated plant N uptake and increased ecosystem N capital in Duke Forests by 25.2 and 8.5%,*** addition,elevated cO_(2)resulted in the decrease of c exit rates(*** in c residence times)in foliage,woody biomass,structural litter and passive soil organic matter,but the increase of c exit rate in fine *** results demonstrated that cO_(2)enrichment substantially altered key parameters in determining terrestrial c and N interactions,which have profound implications for model improvement and predictions of future c sequestration in terrestrial ecosystems in response to global change.

关键词： Bayesian probabilistic inversion carbon-nitrogen interactions carbon-nitrogen coupled model Duke FAcE.

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Modeling strain rate sensitivity and high temperature deformation of Mg-3Al-lZn alloy

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Journal of Magnesium and Alloys 2019年第3期7卷 433-443页

作者： adrien chapuis Qing Liu college of Materials Science and Engineering Chongqing UniversityChongqing 400044China

Increasing the plastic deformation temperature of Mg alloys results in higher strain rate sensitivity,easier activation of secondary slip modes,and impeded *** this study,the strain rate sensitivity is estimated for each deformation mode,and visco-plastic self-consistent modeling is used to reproduce the plastic deformation behavior of an Mg-3Al-lZn O-temper plate from 150 to 450℃.Twinning and basal slip have relatively low strain rate sensitivity,whereas secondary slip modes are highly strain rate sensitive at high *** texture evolution and plastic anisotropy are modeled at different temperatures and strain *** show that when the strain rate sensitivity is taken into account,compared with rate independent critical resolved shear stresses,the material parameters and predictions are *** particular,this study shows that,for hot deformation,there is a critical strain rate above which secondary slip modes predominate,and beyond which tension twinning is activated.A similar transition is expected for modes that have different strain rate sensitivity.

关键词： Magnesium alloy AZ31 crystal plasticity VPSc Visco-plastic

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The interferon inducing pathways and the hepatitis c virus

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World Journal of Gastroenterology 2007年第17期13卷 2446-2454页

作者： Eliane F Meurs adrien Breiman Pasteur Institute Hepacivirus Unit F-75015 Paris cedex France Imperial college Faculty of Medicine Department of Virology London W2 1PG United Kingdom

The innate immune response is triggered by a variety of pathogens, including viruses, and requires rapid induction of typeⅠ?interferons (IFN), such as IFNβ and IFNα. IFN induction occurs when specific pathogen motifs bind to specific cellular receptors. In non-professional immune, virally-infected cells, IFN induction is essentially initiated after the binding of dsRNA structures to TLR3 receptors or to intracytosolic RNA helicases, such as RIG-Ⅰ/MDA5. This leads to the recruitment of specific adaptors, such as TRIF for TLR3 and the mitochondrial-associated IPS-1/VISA/MAVS/cARDIF adapter protein for the RNA helicases, and the ultimate recruitment of kinases, such as MAPKs, the canonical IKK complex and the TBK1/IKKε kinases, which activate the transcription factors ATF-2/ c-jun, NF-κB and IRF3, respectively. The coordinated action of these transcription factors leads to induction of IFN and of pro-inflammatory cytokines and to the establishment of the innate immune response. HcV can cleave both the adapters TRIF and IPS-1/VISA/MAVS/ cARDIF through the action of its NS3/4A protease. This provokes abrogation of the induction of the IFN and cytokine pathways and favours viral propagation and presumably HcV chronic infection.

关键词： Toll-like receptor RNA helicase Mitochondrialadapter cardif TBK1/IKKepsilon Interferon induction HcV NS3A protease

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Long-term reconstruction of flash floods in the Qilian Mountains,china,based on dendrogeomorphic methods

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Journal of Mountain Science 2022年第11期19卷 3163-3177页

作者： QIE Jia-zhi ZHANG Yong TRAPPMANN Daniel ZHONG Yi-hua BALLESTEROS-cÁNOVAS Juan Antonio FAVILLIER adrien STOFFEL Markus Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China climate change Impacts and Risks in the Anthropocene(c-cIA) Institute for Environmental SciencesUniversity of GenevaGeneva CH-1205Switzerland Dendrolab.ch Department of Earth SciencesUniversity of GenevaGeneva CH-1205Switzerland National Museum of Natural Sciences MNCN-CSICC/Serrano 115bis28006MadridSpain Department F.-A.Forel for Environmental and Aquatic Sciences University of GenevaGeneva CH-1205Switzerland

In china,flash floods are one of the main natural disasters causing loss of life and damage to *** threat of flash floods is exacerbated with climate change and increased human activities,such that the number of disasters has shown a clear upward trend in recent ***,due to the scarcity of instrumental data or overly short timeseries,we are still lacking critical data to understand spatio-temporal patterns and driving factors of extreme flash *** missing knowledge is however crucial for a proper management of these hazards,especially in remote mountain *** forested catchments,dendrogeomorphology allows the reconstruction of past process activity based on growth disturbances(GDs)in trees that have been affected by past flash ***,in our study,for the first time,we reconstruct past flash floods in the Qilian Mountains,northeast Tibetan Plateau,over past *** this end,we sampled 99 Qinghai spruce(Picea crassifolia)trees affected by flash floods,with a total of 194increment cores,and identified 302 GDs induced by past flash *** GDs have been caused by at least 21 flash floods that we are able to reconstruct over the last 170 *** position of GDs within tree rings and the intra-seasonal dating of past events also allowed discussion of the likely synoptic situations that may have led to the triggering of flash floods in the *** regression analysis confirms that significant correlation exists between cumulative maximum 5-day August-September precipitation and reconstructed flash floods,which is corresponding to the majority of scars and related tangential rows of traumatic resin ducts(TRDs)found in the latewood portion of growth *** results support the idea that abundant precipitation occurring at the end of the summer season and early fall is the key factor driving flash floods in our study *** research not only fills the gaps regarding historical flash flood histories in

关键词： Tree ring Dendrogeomorphology Flash floods Qinghai spruce Qilian Mountains

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Simulation of texture evolution and deformation mechanism in Mg-3Al-1Zn alloy during uniaxial compression

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Science china(Technological Sciences) 2015年第12期58卷 2052-2059页

作者： YAO JinYi WANG BingShu DENG LiPing cHAPUIS adrien LI Qiang LIU Qing college of Materials Science and Engineering Fuzhou University college of Materials Science and Engineering Chongqing University

The effects of starting texture on he flow curves, and microstructure and texture evolutions of AZ31(Mg-3Al-1Zn-0.3Mn in wt.%) alloy during uniaxial compression at room temperature have been investigated by experiments and simulations. Two kinds of cylindrical compression samples were cut from the AZ31 extruded rod: one was cut with the compression direction parallel to the extruded direction(ED), and the other was cut with the compression axis perpendicular to the ED. The samples were termed as c//ED sample and c⊥ED sample, respectively. The results indicate that the general characteristics of flow curves and texture evolutions in both c⊥ED and c//ED samples during compression can be well explained by the relative activities of deformation mechanisms, which show a strong orientation dependence on the initial textures and the current texture. A significant yield behavior can be induced by {10-12} twinning at the starting deformation, and the lower yield stress in c⊥ED sample can be enhanced by the high activity of basal slip. The work hardening behavior is related to the activities of basal slip, pyramidal c+a> slip, {10-12} twinning, as well as {10-11} twinning. However, the activity of prismatic slip is insensitive to the starting texture, and mostly negligible in all samples.

关键词： magnesium alloy EBSD twinning crystal plasticity

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Argon preconditioning protects neuronal cells with a Toll-like receptor-mediated effect

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Neural Regeneration Research 2023年第6期18卷 1371-1377页

作者： Stefanie Scheid adrien Lejarre Jakob Wollborn Hartmut Buerkle Ulrich Goebel Felix Ulbrich Department of Anesthesiology and critical care Medical Center-University of FreiburgFaculty of MedicineFreiburgGermany Department of Anesthesiology Perioperative and Pain MedicineBrigham and Women’s HospitalHarvard Medical SchoolBostonMAUSA Department of Anesthesiology and critical care Medicine St.Franziskus-HospitalMuensterGermany

The noble gas argon has the potential to protect neuronal cells from cell *** far,this effect has been studied in treatment after acute *** using argon has not yet been *** this study,human neuroblastoma SH-SY5Y cells were treated with different concentrations of argon(25%,50%,and 74%;21%O_(2),5%cO_(2),balance nitrogen)at different time intervals before inflicting damage with rotenone(20μM,4 hours).Apoptosis was determined by flow cytometry after annexin V and propidium iodide *** expressions of Toll-like receptors 2 and 4 were also *** were also processed for analysis by western blot and qPcR to determine the expression of apoptotic and inflammatory proteins,such as extracellular-signal regulated kinase(ERK1/2),nuclear transcription factor-κB(NF-κB),protein kinase B(Akt),caspase-3,Bax,Bcl-2,interleukin-8,and heat shock *** staining was performed for TLR2 and 4 and *** were also pretreated with OxPAPc,an antagonist of TLR2 and 4 to elucidate the molecular *** showed that argon preconditioning before rotenone application caused a dose-dependent but not a time-dependent reduction in the number of apoptotic *** with 74%argon for 2 hours was used for further experiments showing the most promising *** decreased the surface expression of TLR2 and 4,whereas OxPAPc treatment partially abolished the protective effect of *** increased phosphorylation of ERK1/2 but decreased NF-κB and *** inhibited mitochondrial apoptosis and the heat shock *** also suppressed the expression of the pro-inflammatory cytokine *** confirmed the alteration of TLRs and *** reversed the argon effect on ERK1/2,Bax,Bcl-2,caspase-3,and interleukin-8 expression,but not on NF-κB and the heat shock *** together,argon preconditioning protects against apoptosis of neuronal c

关键词： apoptosis inflammation interleukin-8 neuroprotection rotenone SH-SY5Y Toll-like receptor 2 Toll-like receptor 4

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AZ31镁合金在平面应变压缩过程中的孪生行为研究

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金属学报 2015年第12期51卷 1441-1448页

作者：汪炳叔邓丽萍 cHAPUIS adrien 郭宁李强福州大学材料科学与工程学院福州350108 重庆大学材料科学与工程学院重庆400044 西南大学材料与能源学部材料工程系重庆400715

采用EBSD技术研究了AZ31镁合金在平面应变压缩过程中的孪生行为.结果表明,当压缩方向为TD,约束方向为RD时,孪生类型主要以{1012}拉伸孪晶为主,孪生变体的选择主要由沿TD的孪生Schmid因子(m)决定,并受RD的影响.可用孪生应变张量来解释不... 详细信息

采用EBSD技术研究了AZ31镁合金在平面应变压缩过程中的孪生行为.结果表明,当压缩方向为TD,约束方向为RD时,孪生类型主要以{1012}拉伸孪晶为主,孪生变体的选择主要由沿TD的孪生Schmid因子(m)决定,并受RD的影响.可用孪生应变张量来解释不同类型孪生晶粒的差异.对于晶粒内部只发生1个{1012}孪生变体的情况,孪生变体在约束方向上的平均孪生应变张量会使得样品伸长;对于晶粒内部含有2个及以上变体的情况,孪生m较大的变体在约束方向上的平均孪生应变张量使得样品伸长,而m较小的变体使得样品在约束方向缩短,在平面应变压缩变形过程中,不同类型的孪生变体相互协调变形.

关键词： AZ31镁合金平面应变 EBSD 孪生变体

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An Integrated Drive for Two PMSMs Involved Automotive Applications and Development of current Reference Expanded Two Arm Modulation Technique

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circuits and Systems 2016年第8期7卷 1794-1815页

作者： V. Krishnakumar V. Kamaraj c. adrien Perianayagam Research Scholar Department of EEE SSN College of Engineering Chennai India Department of Electrical and Electronics Engineering SSN College of Engineering Chennai India Department of Electrical and Electronics Engineering Sri Manakula Vinayagar Engineering College Pondicherry India

A five leg inverter (FLI) control is incorporated to drive two independent rated permanent magnet synchronous motors (PMSMs) for automotive applications. Literature evidences many attempts of employing the FLI for controlling two general purpose/special motors, where variety of modulation techniques has been practiced for performance enhancement. Also in these cases one leg of inverter is common to both the motors. The expanded two arm modulation (ETAM) has been generally engaged in FLI. In ETAM the percentage voltage utilization factor (VUF) is calculated based on “αmax”, where “αmax” is the maximum modulation index and equal to and hence it restricts the VUF to 50%. This makes the FLI drives to use the dc link in inefficient way, which is due to the fact that conventional ETAM works with voltage reference. This paper modifies the ETAM in an ingenious way to improve the VUF further through current reference. In addition, the developed current reference expanded two arm modulation (cRETAM) minimizes the current harmonics and torque ripple as well. A detailed comparison of the cRETAM with the conventional ETAM and the competent digital counterpart, space vector pulse width modulation (SVPWM), is also presented. The enhancement in VUF, torque ripple minimization and current total harmonic distortion (THD) reduction are found in the MATLAB based simulation results.

关键词： EV/HEV Traction Drive SVPWM Five Leg Inverter Two Permanent Magnet Synchronous Motor Drive current Reference Expanded Two Arm Modulation (cRETAM) Expanded Two Arm Modulation (ETAM)

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Slip deformation mechanism of α-Zr at 700 °c

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Transactions of Nonferrous Metals Society of china 2019年第7期29卷 1465-1475页

作者： Qing-hui ZENG adrien cHAPUIS Bai-feng LUAN Qing LIU college of Materials Science and Engineering Chongqing UniversityChongqing 400044China

Mechanical properties, corrosion behavior and hydrogen absorption of zirconium alloys are related to the texture resulting from prior forming processes. In order to investigate the high temperature deformation behavior of α-Zr, compression tests at 700 ℃, microstructure measurements via EBSD, and visco-plastic self-consistent modeling were performed. Twinning activity was negligible at strain rates ε≤1s^-1. The strain rate sensitivity m=0.17 seemed to be the same for all slip modes. Material parameters were fitted to reproduce the mechanical anisotropy and deformed texture, and were validated by comparing the simulated and measured strain anisotropy. The best-fit simulation showed that at high temperatures prismatic slip was the easiest deformation mode and pyramidal c+a> was the hardest, but basal slip and pyramidal slip operated easily and in large amount.

关键词： deformation mechanism Zr alloy EBSD crystal plasticity plastic deformation

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锆合金热变形过程中的织构演变（英文）

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稀有金属材料与工程 2019年第8期48卷 2393-2399页

作者：曾庆辉栾佰峰 chapuis adrien 刘庆重庆大学

选取了一种热轧退火态的锆合金板材沿着其板材法向(0°样品)及横向(90°样品)在700℃下以1 s-1应变速率进行压缩试验。利用电子背散射衍射(EBSD)技术对变形后样品的微观组织及织构进行表征,并利用粘塑性自洽模型(VPSc)确定了在低应变条... 详细信息

选取了一种热轧退火态的锆合金板材沿着其板材法向(0°样品)及横向(90°样品)在700℃下以1 s-1应变速率进行压缩试验。利用电子背散射衍射(EBSD)技术对变形后样品的微观组织及织构进行表征,并利用粘塑性自洽模型(VPSc)确定了在低应变条件下的各滑移系及孪晶的相对开启量。微观组织揭示了在2种样品中均有动态再结晶的发生。再结晶晶粒的织构变化与变形晶粒的织构变化相似,表明再结晶过程中的优先形核及长大过程不会影响织构的形成及变化。在0°样品中,基面滑移、柱面滑移和锥面c+a>滑移在变形初期阶段同时开启,但是在90°样品中,只有少量的锥面c+a>滑移在变形初期阶段开启。在90°样品中存在的高强度1010//RD织构组分是由大量开启的柱面滑移造成的。此外,700℃下大量基面滑移的开启对织构形成起重要作用。

关键词：锆合金热变形织构粘塑性自洽模拟基面滑移

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