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Equipartition and retrieval of Green's function

Earthquake Science 2010年第5期23卷 397-402页

作者： richard L.weaver Department of Physics University of Illinois

Physical and mathematical arguments are presented for equipartition as the statistical state achieved by a ran- dom field, independent of its sources, in the limit of enough scattering. The arguments are simplest for the case of thermally excited fields, but are shown to apply also, with caveats, in non-equilibrium acoustics and seismology. Practical implications are discussed.

关键词： noise correlation equipartition elastic waves information entropy

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On the generation and decay of the long-period coda energy of large earthquakes

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Earthquake Science 2021年第2期34卷 103-113页

作者： Xinyu Jiang Xiaodong Song Han H.Xia richard L.weaver Institute of Theoretical and Applied Geophysics School of Earth and Space SciencesPeking UniversityBeijing 100871China Hebei Hongshan Geophysical National Observation and Research Station Peking UniversityBeijing 100871China Institute of Geophysics and Geodynamics School of Earth Science and EngineeringNanjing UniversityNanjing 210023China Department of Physics University of Illinois at Urbana-ChampaignUSA

Seismic coda wave is the tail portion of the earthquake record after main *** on the coda usually focus on high-frequency data within several hours after regional events and attribute them to the scattering effect of the heterogeneities inside the ***,we use records of seven large earthquakes at globally distributed seismic stations to examine the decay of long-period(100 s to 300 s)coda in the time window of 10,000 s to 140,000 s after the origin time and fit it with a statistical *** geometric spreading effect in the estimated initial energy and a locationindependent equivalent attenuation coefficient indicate that the long-period coda energy is less affected by the heterogeneity-induced scattering effect than that of shorterperiod *** coda energy can reach the earth’s inner core and can be explained by a 1D earth model,making it more effective for constraining the global attenuation *** also has the potential to determine the magnitudes of large earthquakes and to explore the interior of planetary bodies.

关键词： long-period coda waves large earthquakes geometric spreading attenuation scattering.

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Amplitude and Attenuation From Ambient Noise Correlations

Amplitude and Attenuation From Ambient Noise Correlations

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2020年中国地球科学联合学术年会

作者： Xiaodong Song Lianqing Zhou Jiangtao Li richard weaver

Ambient noise correlation has been used extensively to retrieve traveltimes of surface waves. However, studies of retrieving amplitude information and attenuation from ambient noise are limited. In this presentation, ... 详细信息

关键词： Amplitude and Attenuation From Ambient Noise Correlations

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Communicating effectively / 7th ed.

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2004年

作者： Saundra Hybels richard L. weaver II.

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Application of temporal re-weighting to ambient noise cross-correlation for improved seismic Green's function

Application of temporal re-weighting to ambient noise cross-...

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2019年中国地球科学联合学术年会

作者： Jiangtao Li richard L.weaver John Y.Yoritomo Xiaodong Song Department of Geology University of Illinois at Urbana-Champaign Department of Physics University of Illinois at Urbana-Champaign Institute of Theoretical and Applied Geophysics School of Earth and Space Sciences Peking University

Due to the non-fully diffuse character of ambient noise, retrieval of amplitude information and attenuation from noise cross-correlations has been difficult. Here we apply the temporal re-weighting method proposed by weaver & Yoritomo(2018) to seismic data from the USArray in the central-midwest US. The results show considerable improvements in retrieved Green's functions in both symmetry and causality. The re-

关键词： Application of temporal re-weighting to ambient noise cross-correlation for improved seismic Green's function

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利用模拟与实际数据从背景噪声中提取地震波衰减的研究

利用模拟与实际数据从背景噪声中提取地震波衰减的研究

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2018年中国地球科学联合学术年会

作者：周连庆宋晓东 richard weaver 赵翠萍中国地震局地震预测研究所美国伊利诺伊大学香槟分校

地球介质具有两种重要的属性—弹性和非弹性属性。弹性属性是通过地震波的走时来研究的。近年来,噪声面波成像方法摆脱了地震面波成像对地震定位和震源机制的影响,且不受地震发生无规律的限制。噪声面波成像已广泛应用于速度结构反演。... 详细信息

地球介质具有两种重要的属性—弹性和非弹性属性。弹性属性是通过地震波的走时来研究的。近年来,噪声面波成像方法摆脱了地震面波成像对地震定位和震源机制的影响,且不受地震发生无规律的限制。噪声面波成像已广泛应用于速度结构反演。而地球介质的另一个重要属性即非弹性属性需要通过地震波衰减来研究。与地震波衰减直接相关联的介质品质因子Q值描述了地球介质的非弹性和非均匀性,是了解地下裂隙的数量、孔隙密度与分布以及孔隙中存在的流体含量的重要参数。测定衰减

关键词：地震波衰减地球介质非弹性背景噪声经验格林函数

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有效沟通第7版 1版

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丛书名：华夏经管新书

2005年

作者：（美）桑德拉·黑贝尔斯（Saundra Hybels）（美）理查德·威沃尔二世（richard L.weaverⅡ）李业昆译

华夏经管:本书介绍了沟通原理、方法和技艺，其目的是帮助读者更有效地进行沟通，以提高沟通效果。主要分四个部分：沟通的基本原理、人际间沟通、小组内沟通以及公共场合中的沟通。

ISBN: (数字)7508035976

ISBN: (纸本)7508035976

关键词：人间交往

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Re-engineering artificial muscle with microhydraulics

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Microsystems & Nanoengineering 2017年第1期3卷 278-285页

作者： Jakub Kedzierski Eric Holihan Rafmag Cabrera Isaac weaver Massachusetts Institute of Technology Lincoln Laboratory LexingtonMA 02420USA

We introduce a new type of actuator,the microhydraulic stepping actuator(MSA),which borrows design and operational concepts from biological muscle and stepper *** offer a unique combination of power,efficiency,and scalability not easily achievable on the *** actuator works by integrating surface tension forces produced by electrowetting acting on scaled droplets along the length of a thin *** muscle,MSAs have liquid and solid functional components and can displace a large fraction of their *** 100μm pitch MSA presented here already has an output power density of over 200 W kg^(−1),rivaling the most powerful biological muscles,due to the scaling of surface tension forces,MSA’s power density grows quadratically as its dimensions are reduced.

关键词： artificial muscle electrowetting linear actuator microactuator microsystem microhydraulic stepping actuator

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Functional diversity of small-mammal postcrania is linked to both substrate preference and body size

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Current Zoology 2020年第5期66卷 539-553页

作者： Lucas N.weaver David M.Grossnickle Department of Biology Life Sciences BuildingUniversity of WashingtonSeattleWA 98195USA

Selective pressures favor morphologies that are adapted to distinct ecologies,resulting in trait partition!ng among ***,the effects of these selective pressures vary across taxa,especially because morphology is also influenced by factors such as phylogeny,body size,and functional *** this study,we examine how these factors impact functional diversification in *** has been proposed that trait partitioning among mammalian ecomorphotypes is less pronoun ced at small body sizes due to biomecha nical,energetic,and environ mental factors that favor a"generalist"body plan,whereas larger taxa exhibit more substantial functional *** title this the Diverge nee Hypothesis(DH)because it predicts greater morphological divergence among ecomorphotypes at larger body *** test DH by using phylogenetic comparative methods to examine the postcranial skeletons of 129 species of taxonomically diverse,small-tomedium-sized(<15 kg)mammals,which we categorize as either"tree-dwellers"or"ground-dwellers."In some analyses,the morphologies of ground-dwellers and tree-dwellers suggest greater between-group differentiation at larger sizes,providing some evidence for ***,this trend is n either particularly strong nor supported by all an *** stead,a more pronoun ced patter n emerges that is distinct from the predictions of DH:within-group phenotypic disparity increases with body size in both ground-dwellers and tree-dwellers,driven by morphological outliers among"medium'-sized ***,evolutionary increases in body size are more closely linked to increases in within-locomotor-group disparity tha n to in creases in betwee n-group *** discuss biomechanical and ecological factors that may drive these evolutionary patter ns,and we emphasize the significant evolutionary influences of ecology and body size on phenotypic diversity.

关键词： adaptive landscapes ecomorphology morphometries phenotypic diversity phylogenetic comparative methods trait partitioning

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Effect of ceria surface facet on stability and reactivity of isolated platinum atoms

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Nano Research 2022年第7期15卷 5922-5932页

作者： Bochuan Song Shuxin Si Asiye Soleymani Yan Xin Helena E.Hagelin-weaver Department of Chemical Engineering University of FloridaGainesville 32611USA National High Magnetic Field Laboratory Florida State UniversityTallahassee 32310USA

Well-defined surface structures and uniformity are key factors in exploring structure–activity relationships in heterogeneous catalysts.A modified atomic layer deposition method and three well-defined CeO_(2) nanoshapes,octahedra with(111)surfaces,cubes exposing(100)facets,and rods with(100)and(110)surface facet terminations,were utilized to synthesize ultra-low loading Pt/CeO_(2) catalysts and allow investigations on the influence of ceria surface facet on isolated Pt species under reducing conditions.A mild reduction temperature(150℃)reduces the initial platinum ions present on the surfaces of the ceria support but preserves the isolated Pt atoms on all ceria surface *** contrast,a reduction temperature of 350°C,reveals very different interactions between the initial single Pt atoms and the various ceria surface facets,leading to dissimilar and nonuniform Pt ensembles on the three ceria *** isolate facet dependent Pt–CeO_(2) interactions and avoid variations between Pt species,the Pt1/CeO_(2) catalysts after reduction at 150°C were subjected to CO oxidation *** isolated Pt atoms on the CeO_(2) octahedra and cubes are less active in the CO oxidation reaction,compared with Pt on CeO_(2) *** the case of Pt on the CeO_(2) octahedra this is due to strongly bound CO blocking active sites together with a stable CeO_(2)(111)surface limiting the oxygen supply from the *** the CeO_(2) cubes,some Pt is not available for reaction and CO is bound strongly on the available Pt *** addition,the Pt catalysts supported on the CeO_(2) cubes are not stable with time on *** isolated Pt atoms on the CeO_(2) rods are considerably more active under these conditions and this is due to a weaker Pt–CO bond strength and more facile reverse oxygen spillover from the defect-rich(110)surfaces of the rods due to the lower energy of oxygen vacancy formation on this CeO_(2) *** Pt supported on the CeO_(2) rods is also remarkably stable with t

关键词： single atom catalyst CeO_(2)shapes facet effects Pt1/CeO_(2) diffuse reflectance infrared Fourier transform spectroscopy(DRIFTS)

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