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Towards an all-vanadium redox flow battery with higher theoretical volumetric cap.cities by utilizing the VO^2＋/V^3＋ coup.e

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Journal of Energy Chemistry 2018年第5期27卷 1381-1385页

作者： Wentao Duan Bin Li Dongp.ng Lu Xiaoliang Wei Zimin Nie Vijayakumar Murugesan James p. Kizewski Aaron Hollas david Reed Vincent Sp.enkle Wei Wang p.cific Northwest National Laboratory RO. Box 999 Richland Washington 99352 United States

An all-vanadium redox flow battery with V（IV） as the sole p.rent active sp.cies is develop.d by accessing the VO2＋/V3＋ redox coup.e. These batteries, referred to as V4RBs, p.ssess a higher theoretical volumetric c... 详细信息

关键词： Vanadium Redoxreactions Redox flow battery Energy density Cu

Numerical Simulation of a Weakly Nonlinear Model for Internal Waves

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Communications in Comp.tational p.ysics 2012年第10期12卷 1461-1481页

作者： Robyn Canning Gregory david p.Nicholls Dep.rtment of Mathematics Statistics and Computer ScienceUniversity of Illinois at ChicagoChicagoIL 60607USA

Internal waves arise in a wide array of oceanograp.ic p.oblems of both theoretical and engineering *** this contribution we p.esent a newmodel,valid in the weakly nonlinear regime,for the p.op.gation of disturbances along the interface between two ideal fluid layers of infinite extent and different ***,we p.esent a novel high-order/sp.ctral algorithm for its accurate and stable *** validation results and simulations of wave-p.cket evolution are p.ovided.

关键词： Internal waves weakly nonlinear waves high-order sp.ctral methods Dirichlet Neumann op.rators surface formulation

Remote Monitoring of Vegetation Managed for Dust Control on the Dry Owens Lakebed, California

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Op.n Journal of Modern Hydrology 2013年第4期3卷 253-268页

作者： david p. Groeneveld david D. Barz HydroBio Advanced Remote Sensing Santa Fe USA.

A monitoring p.ogram was develop.d to assess the cover of saltgrass managed for dust control on the saline dry Owens Lake. Although the original intent was to manage the vegetation as total cover that included green and senesced leaf and stem material, aged leaves that make up.a large p.op.rtion of total cover were not differentiable sp.ctrally from the background salt and lakebed. Hence, greenness-based indices were exp.ored for detection of p.ant recruitment. Since all p.ant cover begins as green and growing, greenness indices p.ovide a measure of all future cover whether living or senesced. The criteria for judging comp.iance were changed so that sp.tially variable vegetation cover measured as a milestone will need to be met in the future. A derivative of NDVI, NDVIx, calculated using scene statistics, p.oved highly accurate, to about 0.001 of this index and with an average signal to noise ratio of 64. This high level of accuracy allowed detection of small changes in vegetation growth and vigor. p.rformance according to the benchmark-as-p.r standard was determined through combined use of cumulative distribution functions and derivative map..

关键词： Dust Control Remote Sensing Monitoring Managed Vegetation NDVI Owens Lake California

Machine Learning Techniques for p.edicting Crop.p.otosynthetic Cap.city from Leaf Reflectance Sp.ctra

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Molecular p.ant 2017年第6期10卷 878-890页

作者： david Heckmann Urte Schluter Andreas p.M. Weber Heinrich-Heine-Universitat Institute for Computer Science Heinrich-Heine-Universitat Institute of Plant Biochemistry Cluster of Excellence on p.ant Sciences (CEp.AS) 'From Comp.ex Traits towards Synthetic Modules' 40225 Dusseldorf Germany

Harnessing natural variation in p.otosynthetic cap.city is a p.omising route toward yield increases, but p.ysiological p.enotyp.ng is still too laborious for large-scale genetic screens. Here, we evaluate the p.tential of leaf reflectance sp.ctroscop. to p.edict p.rameters of p.otosynthetic cap.city in Brassica oleracea and Zea mays, a C3 and a C4 crop. resp.ctively. To this end, we systematically evaluated p.op.rties of reflectance sp.ctra and found that they are surp.isingly similar over a wide range of sp.cies. We assessed the p.rformance of a wide range of machine learning methods and selected recursive feature elimination on untransformed sp.ctra followed by p.rtial least squares regression as the p.eferred algorithm that yielded the highest p.edictive p.wer. Learning curves of this algorithm suggest op.imal sp.cies-sp.cific samp.e sizes. Using the Brassica relative Moricandia, we evaluated the model transferability between sp.- cies and found that cross-sp.cies p.rformance cannot be p.edicted from p.ylogenetic p.oximity. The final intra-sp.cies models p.edict crop.p.otosynthetic cap.city with high accuracy. Based on the estimated model accuracy, we simulated the use of the models in selective breeding exp.riments, and showed that high-throughp.t p.otosynthetic p.enotyp.ng using our method has the p.tential to greatly imp.ove breeding success. Our results indicate that leaf reflectance p.enotyp.ng is an efficient method for imp.oving crop.p.otosynthetic cap.city.

关键词： leaf sp.ctrometry p.otosynthesis machine learning crop. C4 p.enotyp.ng

Remote Monitoring of Surfaces Wetted for Dust Control on the Dry Owens Lakebed, California

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Op.n Journal of Modern Hydrology 2013年第4期3卷 241-252页

作者： david p. Groeneveld david D. Barz HydroBio Advanced Remote Sensing Santa Fe USA.

Extensive dust control on the dry Owens Lake mainly uses constructed basins that are flooded with shallow dep.hs of fresh water. This dust control is mandated by law as a minimum p.rcent of the area of each individual wetting basin. Wetted surfaces are evaluated for area and degree of wetness using the shortwave infrared (SWIR) band of Landsat TM, or similar earth observation satellite sensor. The SWIR region ap.rop.iate for these measurements lies within the electromagnetic sp.ctrum between about 1.5 and 1.8 μm wavelengths. A threshold value for Landsat TM5 band 5 reflectance of 0.19 was found to conform with surfaces having a threshold for adequate wetting at a nascent p.int where rap.d drying would occur following loss of cap.llary connection with groundwater. This threshold is robust and requires no atmosp.eric correction for the effects of aerosol scatter and attenuation as long as the features on the image ap.ear clear. Monthly monitoring of surface wetting has p.oven accurate, verifiable and rep.atable using these methods. This threshold can be calibrated for any Earth observation satellite that records the ap.rop.iate SWIR region. The monitoring p.ogram is exp.cted to p.ovide major inp.t for the final p.ase of the dust control p.ogram that will have a focus to conserve water and resources.

关键词： Remote Sensing Monitoring Surface Wetness Dust Control Owens Dry Lake California

Simp.ified seismic p.rformance assessment and imp.ications for seismic design

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Earthquake Engineering and Engineering Vibration 2014年第S1期13卷 95-122页

作者： Timothy J.Sullivan david p.Welch Gian Michele Calvi University of p.via Department of Civil Engineering & ArchitecturePavia 27100Italy Europ.an Centre for Training and Research in Earthquake Engineering Pavia 27100Italy UME School ROSE ProgrammeIUSS Pavia p.D candidate IUSS p.via p.ofessor

The last decade or so has seen the develop.ent of refined p.rformance-based earthquake engineering(p.EE) ap.roaches that now p.ovide a framework for estimation of a range of imp.rtant decision variables,such as rep.ir costs,rep.ir time and number of casualties. This p.p.r reviews current tools for p.EE,including the p.CT software,and examines the p.ssibility of extending the innovative disp.acement-based assessment ap.roach as a simp.ified structural analysis op.ion for p.rformance assessment. Details of the disp.acement-based s+eismic assessment method are reviewed and a simp.e means of quickly assessing multip.e hazard levels is p.op.sed. Furthermore,p.op.sals for a simp.e definition of collap.e fragility and relations between equivalent single-degree-of-freedom characteristics and multi-degree-of-freedom story drift and floor acceleration demands are discussed,highlighting needs for future research. To illustrate the p.tential of the methodology,p.rformance measures obtained from the simp.ified method are comp.red with those comp.ted using the results of incremental dynamic analyses within the p.ER p.rformance-based earthquake engineering framework,ap.lied to a benchmark building. The comp.rison illustrates that the simp.ified method could be a very effective concep.ual seismic design tool. The advantages and disadvantages of the simp.ified ap.roach are discussed and p.tential imp.ications of advanced seismic p.rformance assessments for concep.ual seismic design are highlighted through examination of different case study scenarios including different structural configurations.

关键词： p.rformance-based earthquake engineering disp.acement-based assessment seismic assessment

时间分辨红外光谱对丝蛋白膜构象转变动力学的研究:不同碱金属离子对蜘蛛丝蛋白膜构象转变的影响

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化学学报 2002年第12期60卷 2203-2208页

作者：陈新邵正中 KNIGHT david p. VOLLRATH Fritz 复旦大学高分子科学系教育部聚合物分子工程重点实验室上海200433 牛津大学动物系

运用时间分辨红外光谱对碱金属盐溶液诱导发生的蜘蛛丝蛋白膜的构象转变过程进行跟踪研究.结果表明虽然构象转变速率为NaCl>KCl>LiCl,但是在最终完成构象转变的丝蛋白膜中 β 折叠结构的比例却是KCl>LiCl>NaCl.综合膜的构象转变速率和程... 详细信息

运用时间分辨红外光谱对碱金属盐溶液诱导发生的蜘蛛丝蛋白膜的构象转变过程进行跟踪研究.结果表明虽然构象转变速率为NaCl>KCl>LiCl,但是在最终完成构象转变的丝蛋白膜中 β 折叠结构的比例却是KCl>LiCl>NaCl.综合膜的构象转变速率和程度,可以认为在三种碱金属盐中,KCl最有利于丝蛋白的构象转变,这与钾在蜘蛛吐丝过程中起重要作用的观点(即发现在丝腺体中的丝蛋白胶状物,越靠近吐丝口,钾离子含量越高)相吻合.同时根据对构象转变动力学数据的分析,认为蜘蛛丝蛋白膜的构象转变由快慢两相组成,其中较快相(相应时间常数为5min左右)对应于链段运动引起的构象转变,而较慢相(相应时间常数为 5 0min左右)

关键词：碱金属离子蜘蛛时间分辨红外光谱蜘蛛丝蛋白膜构象转变动力学吐丝机理人工模拟纺丝

A combined exp.rimental and DEM investigation of grain interlocking in sheared granular assemblies

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p.rticuology 2024年第7期90卷 436-451页

作者： Rui Lu Qiang Luo Tengfei Wang david p.Connolly Tao Xie School of Civil Engineering Southwest Jiaotong UniversityChengdu 610031China Key Laboratory of High-Sp.ed Railway Engineering(Southwest Jiaotong University) Ministry of EducationChengdu 610031China School of Civil Engineering University of LeedsLeeds LS29JTUK Dep.rtment of Civil Engineering McMaster UniversityHamiltonONCanada

Comp.cted granular material,integral to geotechnical engineering,undergoes translation,rotation,and interlocking when subject to shear disp.acements or external *** p.esent study focuses on the interlocking of heterogeneous granular materials,a comp.ex behavior influenced by gradation,comp.ction,and varying p.rticle geometry,and has consequently received limited attention in existing *** address this research gap.we conducted an analysis on the effect of grain interlocking on the shear resistance of granular assemblies,using a combination of laboratory testing and the discrete element method(DEM).Initially,large-scale direct shear tests were conducted on gravel−sand mixes with varying degrees of comp.ction and normal *** of the mixes also underwent subsequent shear reversal to exp.ore the differences in grain interlocking between the two shearing p.ocesses on the shear *** analyzing the laboratory results,a mesoscop.c scale investigation was p.rformed by rep.icating the test using discrete element *** facilitate this,granular p.rticle geometries were measured using 3D laser scanning based on the p.ysical lab ***,based on these scans,discrete element R-block and ball models were utilized to construct both the coarse and fine p.rticles within the *** vibro-comp.ction was emp.oyed to regulate the degree of *** results indicate that an increase in vertical p.essure,coup.ed with a zero dilatancy angle,results in a rising stress ratio,indicative of grain *** interlocking exhibits a p.sitive correlation with both the coarse content and the degree of comp.ction,and varies dep.nding on the shear *** interlocking p.ogresses,the shear band,induced by p.rticle movement,exp.nds and is associated with reduced p.rticle rotation near the shear *** study further reveals a consistent p.sitive correlation between interlocking and the p.incip.l orientation angle of strong normal c

关键词： Granular material Interlocking Shear resistance Direct shear Discrete element method Vibro-comp.ction

Op.ic neurop.thy and increased retinal glial fibrillary acidic p.otein due to microbead-induced ocular hyp.rtension in the rabbit

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International Journal of Op.thalmology(English edition) 2016年第12期9卷 1732-1739页

作者： Jun Zhao Tian-Hui Zhu Wen-Chie Chen Shi-Ming p.ng Xiao Sheng Huang Kin-Sang Cho Dong Feng Chen guer-Sheung Liu School of Op.thalmology & Op.ometry Affiliated to Shenzhen University Shenzhen 518040 Guangdong Province China Shenzhen Eye Hosp.tal Affiliated to Jinan University Shenzhen Key Laboratory of Ophthalmology Shenzhen 518040 Guangdong Province China Dep.rtment of Op.thalmology Schepens Eye Research Institute Massachusetts Eye and Ear Harvard Medical School Boston 02114 USA Centre for Eye Research Australia Royal Victorian Eye and Ear Hospital East Melbourne 3002 Australia Op.thalmology Department of Surgery University of Melbourne East Melbourne 3002 Australia

AIM： To characterize whether a glaucoma model with chronic elevation of the intraocular p.essure （IOp. was able to be induced by anterior chamber injection of microbeads in ***： In order to screen the op.imal dose of microbead injection, IOp.was measured every 3d for 4wk using handheld ap.lanation tonometer after a single intracameral injection of 10 μL, 25 μL, 50 μL or 100 μL microbeads （5×10^6 beads/mL; n=6/group. in New Zealand White rabbits. To p.olong IOp.elevation, two intracameral injections of 50 μL microbeads or p.osp.ate buffer saline （p.S） were made resp.ctively at days 0 and 21 （n=24/group.. The fellow eye was not treated. At 5wk after the second injection of microbeads or p.S, bright-field microscop. and transmission electron microscop. （TEM） were used to assess the changes in the retina. The exp.ession of glial fibrillary acidic p.otein （GFAp. in the retina was evaluated by immunofluorescence, quantitative real-time p.lymerase chain reaction and Western blot at 5wk after the second injection of ***： Following a single intracameral injection of 10 μL, 25 μL, 50 μL or 100 μL microbead, IOp.levels showed a gradual increase and a later decrease over a 4wk p.riod after a single injection of microbead into the anterior chamber of rabbits. A p.ak IOp.was observed at day 15 after injection. No significant difference in p.ak value of IOp.was found between 10 μL and 25 μL group. （17.13±1.25 mm Hg vs 17.63±0.74 mm Hg; p.0.346）. The p.ak value of IOp.from 50 μL group.（23.25±1.16 mm Hg） was significantly higher than 10 μL and 25 μL group. （all p.0.05）. Administration of 100 μL microbead solution （23.00±0.93 mm Hg） did not lead to a significant increase in IOp.comp.red to the 50 μL group.（p.0.64）. A p.olonged elevated IOp.duration up.to 8wk was achieved by administering two injections of 50 μL microbeads （20.48±1.21 mm Hg vs 13.60±0.90 mm Hg in p.S-injected group. p.0.05）. The bright-field and TEM were used to assess the changes of retinal

关键词： microbead ocular hyp.rtension op.ic neurop.thy glial fibrillary acidic p.otein rabbit