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Pseudo-Depth/Intercept-Time Monotonicity Requirements in the Inverse Scattering Algorithm for Predicting Internal Multiple Reflections

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Communications in Computational Physics 2009年第1期5卷 163-182页

作者： bogdan G.Nita arthur b.weglein Department of Mathematical Sciences Montclair State University1 Normal AvenueMontclairNJ 07043USA. Department of Physics University of Houston617 Science and Research Bldg.1HoustonTX 77004USA

In this paper we discuss the inverse scattering algorithm for predicting internal multiple reflections(reverberation artefacts),focusing our attention on the construction *** speaking,the algorithm combines amplitude and phase information of three different arrivals(sub-events)in the data set to predict one multiple *** three events are conditioned by a certain relation which requires that their pseudo-depths,defined as the depths of their turning points relative to the constant background velocity,satisfy a lower-higher-lower *** implicitly assumes a pseudo-depth monotonicity condition,i.e.,the relation between the actual depths and the pseudo-depths of any two sub-events is the *** study this relation in pseudo-depth and show that it is directly connected with a similar relation between the vertical or intercept times of the *** paper also provides the first multidimensional analysis of the algorithm(for a vertically varying acoustic model)with analytical *** show that the construction of internal multiples is performed in the plane waves domain and,as a consequence,the internal multiples with headwaves sub-events are also predicted by the *** we analyze the differences between the time monotonicity condition in vertical or intercept time and total travel time and show a 2D example which satisfies the former but not the *** we discuss one case in which the monotonicity condition is not satisfied by the sub-events of an internal multiple and discuss ways of lowering these restrictions and of expanding the algorithm to address these types of multiples.

关键词： Multiple reflections seismic imaging inverse scattering

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使用模拟退火算法为界面多次波衰减提供子波估计

使用模拟退火算法为界面多次波衰减提供子波估计

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美国勘探地球物理学家学会第64届年会

作者： Paulo M．Carvalho arthur b.weglein 王友仁 Petrobras brazil Schlumberger Cambridge Research UK

逆散射的界面多次波衰减法（Carvalho等,1991和Carvalho,1992）要求已知震源子波。该方法本身提供了一种估计子波的方法,估计处理使用一种最佳化算法。一种基于模拟退火的整体搜索程序用来实现最佳化。模拟退火具有随机成分,允许搜索包...

逆散射的界面多次波衰减法（Carvalho等,1991和Carvalho,1992）要求已知震源子波。该方法本身提供了一种估计子波的方法,估计处理使用一种最佳化算法。一种基于模拟退火的整体搜索程序用来实现最佳化。模拟退火具有随机成分,允许搜索包含许多局部极小值的整体极小值功能。在本项工作中,界面多次波衰减法和子波估计程序已用合成和实际资料的例子来描述和说明。在实际资料条件下获得的结果,证明了该处理的稳键性。

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SnapshotPrune: A Novel bitcoin-based Protocol Toward Efficient Pruning and Fast Node bootstrapping

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Tsinghua Science and Technology 2024年第4期29卷 1037-1052页

作者： Pengfei Huang Xiaojun Ren Teng Huang arthur Sandor Voundi Koe Duncan S Wong Hai Jiang Institute of Artificial Intelligence and blockchain Guangzhou UniversityGuangzhou 510006China Institute of Artificial Intelligence and blockchain Guangzhou UniversityGuangzhou 510006Chinaand also with Pazhou LabGuangzhou 510330China

Node synchronization is essential for the stability of the bitcoin network. Critics have raised doubts about the ability of a new node to quickly and efficiently synchronize with the bitcoin network and alleviate the storage pressure from existing full nodes to stockpile new data. basic pruning and other techniques have been explored to address these concerns but have been insufficient to reduce node synchronization delay and effectively suppress the growth of synchronized data. In this study, we propose SnapshotPrune, a novel pruning and synchronization protocol that achieves fast node bootstrapping in the bitcoin blockchain. Real bitcoin historical data are leveraged to measure the synchronization time and monitor the network traffic during node bootstrapping. The protocol requires data downloads that are 99.70% less than bitcoin Core, 81% less than CoinPrune, and 60% less than SnapshotSave, thereby saving 97.23% of download time. Findings show that the proposed design enhances the storage efficiency and reduces the node synchronization delay compared with existing techniques. We hypothesize that the efficiency of this protocol increases with the block height.

关键词： synchronization blockchain Unspent Transaction Output(UTXO)pruning snapshot fast bootstrapping

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基于格林理论的鬼波压制方法及其应用

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石油物探 2017年第4期56卷 507-515,533页

作者：杨金龙 weglein arthur b 中国石油化工股份有限公司石油物探技术研究院江苏南京211103 The University of Houston Houston 77004USA

海洋地震资料存在受海水面虚反射(鬼波)引起的陷波效应,为此,从散射理论出发,提出了基于格林理论的空间-频率(x-ω)域任意震源鬼波压制方法,并详细论述了其物理意义。在一维理论数据分析的基础上,形成了格林理论鬼波压制处理流程。利用... 详细信息

海洋地震资料存在受海水面虚反射(鬼波)引起的陷波效应,为此,从散射理论出发,提出了基于格林理论的空间-频率(x-ω)域任意震源鬼波压制方法,并详细论述了其物理意义。在一维理论数据分析的基础上,形成了格林理论鬼波压制处理流程。利用模拟数据和实际数据进行了测试,实现了基于上下缆和双检采集地震资料的鬼波压制。处理结果表明,此方法完全基于地震数据驱动,无需任何地下介质信息,适用于各种复杂的海洋地形和地质情况。鬼波压制后地震资料的频带得到有效拓宽、地震资料的分辨率得到提高,有利于地震资料的后续处理和解释。

关键词：虚反射陷波效应鬼波压制散射理论格林理论

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broad Hormonal Responses Induced by Aluminum in Roots of Dwarf Transgenics of Solanum lycopersicum L. cv “Micro-Tom”

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American Journal of Plant Sciences 2024年第5期15卷 349-358页

作者： arthur b. Rates Daniela boanares Daniele S. G. Pianetti Felipe Della-Torre Joni E. Lima Marcel G. C. França Department of botany and Plant Physiology Laboratory Federal University of Minas Gerais Belo Horizonte Brazil

The spatial pattern distribution of plant hormones in response to aluminum (Al) toxicity in roots remains to be shown. This study was performed to assess the root hormonal accumulation and gene expression in response to Al toxicity in five transgenic miniature dwarf tomatoes cv. Micro-Tom (MT). MT and MT transgenics to acid indole acetic, cytokinin, gibberellin, abscisic acid and ethylene were cultivated in nutrient solutions containing different Al concentrations. Root growth elongation was measured and cellular damage was visualized by staining Evans’s blue. The GUS reporter gene staining technique was used to visualize hormonal changes in MT apex root tissues. Data indicated that the MT is sensitive to Al that induced significant growth inhibition and cellular damage. Al concentration of 27 μM was significantly toxic, inducing root apex darkening and inhibition of root development. The qualitative evaluation of GUS reporter gene expression showed intense crosstalk among all hormones studied, underscoring the complexity of signaling induced by Al in apex roots. Results point out to a major understanding of the hormonal signaling in response to Al toxicity, which may induce a change of root growth and architecture with growth inhibition and cell constraints modulated by all different hormones evaluated.

关键词： Gene Reporter Metal Plant Hormones Root Staining

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Acid-treated Fe-doped TiO2 as a high performance photocatalyst used for degradation of phenol under visible light irradiation

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Journal of Environmental Sciences 2019年第9期31卷 183-194页

作者： Vahid Moradi Faysal Ahmed Martin b.G. Jun arthur blackburn Rodney A. Herring Mechanical Engineering Department University of Victoria Victoria British Columbia V8W 2Y2 Canada Center for Advanced Materials and Related Technology University of Victoria Victoria British Columbia V8W 2Y2 Canada School of Mechanical Engineering Purdue University West Lafayette IN 47907-2088 USA

The photocatalytic activity of Fe-doped TiO2 nanoparticles is significantly increased by an acid-treatment process. The photocatalyst nanoparticles were prepared using sol–gel method with 0.5 mol% ratio of Fe:Ti in acidic pH of 3. The nanoparticles were structurally characterized by means of X-ray diffraction(XRD), high-resolution transmission electron microscope(HRTEM), energy-dispersive X-ray spectroscopy(EDX), X-ray photoelectron spectroscopy(XPS) and diffuse reflectance spectroscopy(DRS). It was observed that the photocatalytic activity suffered from an iron oxide contaminating layer deposited on the surface of the nanoparticles. This contamination layer was removed using an HCl acidtreatment process. The photocatalytic activity using 500 mg/L of Fe0.5-TiO2 in a 10 mg/L of phenol solution increased significantly from 33% to 57%(about 73% increase in the performance), within 90 min of reaction time under visible light irradiation. This significant improvement was achieved by removing the iron oxide contamination layer from the surface of the nanoparticles and adjusting p H to mild acidic and basic pHs.

关键词： Phenol degradation Visible light Photocatalyst Kinetics Iron doping

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JAMES GLIMM:MATHEMATICIAN,FRIEND,MENTOR

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Acta Mathematica Scientia 2010年第2期30卷 369-376页

作者： arthur Jaffe Thomas Spencer Department of Mathematics Harvard University School of Mathematics Institute for Advanced Study

A description of Jim＇s contributions to mathematics would take us far beyond our expertise. Jim was never content to spend too long in any one area of mathematics. Operator algebras, hyperbolic systems of conservation laws, fluid dynamics, quantum field theory and statistical mechanics and the computational aspects of applied mathematics are just a few of the areas to which Jim has contributed. Here we relate a few impressionistic recollections of personal interactions, together with some ideas about his work in quantum field theory and statistical mechanics. In spite of the non-technical character of these observations, we hope nevertheless that they will provide pleasure for our dear friend and for other readers as well.

关键词： JAMES GLIMM work

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Duality of graph invariants

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Science China Mathematics 2020年第8期63卷 1613-1626页

作者： Kaifeng bu Weichen Gu arthur Jaffe Harvard University CambridgeMA 02138USA School of Mathematical Science Zhejiang UniversityHangzhou 310027China Academy of Mathematics and Systems Science Chinese Academy of SciencesBeijing 100080China

We study a new set of duality relations between weighted,combinatoric invariants of a graph *** dualities arise from a non-linear transform b,acting on the weight function *** define b on a space of real-valued functions O and investigate its *** show that three invariants(the weighted independence number,the weighted Lovasz number,and the weighted fractional packing number)are fixed points of b^2,but the weighted Shannon capacity is *** interpret these invariants in the study of quantum non-locality.

关键词： duality graph invariants quantum non-locality

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Finite Volume Multilevel Approximation of the Shallow Water Equations

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Chinese Annals of Mathematics,Series b 2013年第1期34卷 1-28页

作者： arthur bOUSQUET Martine MARION Roger TEMAM The Institute for Scientific Computing and Applied Mathematics Indiana University Département Mathématique Informatique Université de LyonEcole Centrale de Lyon

The authors consider a simple transport equation in one-dimensional space and the linearized shallow water equations in two-dimensional space, and describe and implement a multilevel finite-volume discretization in the context of the utilization of the incremental unknowns. The numerical stability of the method is proved in both cases.

关键词： Finite-volume methods Multilevel methods Shallow water equations Stability analysis

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broad Hormonal Responses Induced by Aluminum in Roots of Dwarf Transgenics of Solanum lycopersicum L. cv “Micro-Tom”

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American Journal of Plant Sciences（美国植物学期刊） 2024年第5期 349页

作者： arthur b.Rates Daniela boanares Daniele S.G.Pianetti Felipe Della-Torre Joni E.Lima Marcel G.C.França

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