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DEVELOPMENT OF WATERSIIED MODELS FOR TWO SIERRA NEVADA BASINS USING A GEOGRAPHIC INFORMATION SYSTEM

JAWRA Journal of the American Water Resources Association 1993年第6期29卷 923-932页

作者： Jeton, Anne E. Smith, J.LaRue. Respectively Hydrologists U.S. Geological Survey 333 West Nye Lane Carson City Nevada 89706.

ABSTRACT: Techniques were developed using vector and raster data in a geographic information system (GIS) to define the spatial variability of watershed characteristics in the north‐central Sierra Nevada of California and Nevada and to assist in computing model input parameters. The U.S. Geological Survey's Precipitation‐Runoff Modeling System, a physically based, distributed‐parameter watershed model, simulates runoff for a basin by partitioning a watershed into areas that each have a homogeneous hydrologic response to precipitation or snowmelt. These land units, known as hydrologic‐response units (HRU's), are characterized according to physical properties, such as altitude, slope, aspect, land cover, soils, and geology, and climate patterns. Digital data were used to develop a GIS data base and HRIJ classification for the American River and Carson River basins. The following criteria are used in delineating HRU's: (1) Data layers are hydrologically significant and have a resolution appropriate to the watershed's natural spatial variability, (2) the technique for delineating HRU's accommodates different classification criteria and is reproducible, and (3) HRU's are not limited by hydrographic‐subbasin boundaries. HRU's so defined are spatially noncontiguous. The result is an objective, efficient methodology for characterizing a watershed and for delineating HRU's. Also, digital data can be analyzed and transformed to assist in defining parameters and in calibrating the model. Copyright © 1993, Wiley Blackwell. All rights reserved

关键词： distributed parameter geographic information system hydrologic‐response unit pattern identification number vector and raster data watershed model

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TRAVELLING WAVE PHENOMENON THROUGH PIEZOELECTRIC ACTUATION OF A FREE-FREE BEAM

TRAVELLING WAVE PHENOMENON THROUGH PIEZOELECTRIC ACTUATION O...

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7th Annual ASME Conference on Smart Materials, Adaptive Structures and Intelligent Systems (SMASIS) / Symposium on Modeling, Simulation and Control (MSC)

作者： Malladi, V. V. N. Sriram Avirovik, Dragan Priya, Shashank Tarazaga, Pablo A. Virginia Tech Vibrat Adapt Struct & Testing Lab Blacksburg VA 24061 USA Virginia Tech CEHMS BMDL Dept Mech Engn Blacksburg VA USA

ISBN: (纸本)9780791846148

A mechanical wave is generated as a result of an oscillating body interacting with the well-defined medium and it propagates through that medium transferring energy from one location to another. The ability to generate and control the motion of the mechanical waves through the finite medium opens up the opportunities for creating novel actuation mechanisms. The focus of this study is on understanding the traveling wave generation and propagation by establishing the relationships that illustrate the role of structural and electromechanical parameters. A brass beam with free-free boundary conditions was selected to be the medium through which the wave propagation occurs. Two piezoelectric elements were bonded on the opposite ends of the beam and were used to generate the controlled oscillations. Excitation of the piezoelectrics results in coupled system dynamics that can be translated into generation of the waves with desired characteristics. Theoretical analysis based on the distributed parameter model and experiments were conducted to provide the comprehensive understanding of the wave generation and propagation behavior.

关键词： Traveling waves distributed parameter FEM piezoelectric materials waves

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On the penny-shaped crack in a non-homogeneous interlayer under torsion

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INTERNATIONAL JOURNAL OF FRACTURE 1996年第4期82卷 335-343页

作者： Wang, Xuyue Zou, Zhenzhu Wang, Duo Harbin Inst Technol Dept Astronaut & Mech Harbin 150001 Peoples R China Shijiazhuang Railway Inst Dept Transportat Shijiazhuang 050043 Peoples R China

This paper presents a theoretical treatment of a penny-shaped crack in an interfacial zone, along the thickness of which the elastic modulus is assumed as mu 2(z) = (a + bz)(x), where k represents the distribution parameter independent of material properties and interlayer thickness h. The theoretical formulations governing the torsion deformation behavior of the material are based on the use of a dislocation density function and integral transform technique. The stress intensity factor is obtained by solving a singular integral equation. Numerical examples are given to show the effects of material properties, interlayer thickness, and especially the distribution parameter k on the stress intensity factor. In the numerical procedure, modified Bessel functions are used, and the rate of convergence depends greatly on the ratio of h/c, where c is the crack radius.

关键词： modified Bessel function penny-shaped cracks Elastic Modulus numerical procedure Material properties Stress intensity factors torsion solid-state phase transformations distributed parameter

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Source Coding with Side Information at the Decoder: Models with Uncertainty, Performance Bounds, and Practical Coding Schemes

Source Coding with Side Information at the Decoder: Models w...

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International Symposium on Information Theory and its Applications (ISITA)

作者： Dupraz, Elsa Roumy, Aline Kieffer, Michel Univ Paris 11 SUPELEC CNRS LSS F-91192 Gif Sur Yvette France

ISBN: (纸本)9784885522673

We consider the problem of source coding with side information ( SI) at the decoder only, when the joint distribution between the source and the SI is not perfectly known. Four parametric models for this joint distribution are considered, where uncertainty about the distribution is turned into uncertainty about the value of the parameters. More precisely, a prior distribution for the parameters may or may not be available. Moreover, the value of the parameters may either change at every symbol or remain constant for a while. This paper overviews the results on the performance of lossless source coding with SI at the decoder for the four models. The way LDPC-based encoding and decoding schemes should be designed to cope with model uncertainty is provided. Most of the proposed practical schemes perform close to the theoretical limits.

关键词： source coding decoders On-Site Inspections Silicon International System of Units lossless source coding decoding scheme distributed parameter Uncertainty model uncertainty

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Modeling and Simulation of the Automatic Control System of the Residual Water Blunting Process from a Metallurgical Factory

Modeling and Simulation of the Automatic Control System of t...

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8th IEEE International Symposium on Applied Computational Intelligence and Informatics (SACI)

作者： Muresan, V. Abrudean, M. Colosi, T. Tech Univ Cluj Napoca Dept Automat Cluj Napoca Romania

ISBN: (纸本)9781467364003;9781467363976

This paper presents a method for the pH control of the residual water from a metallurgical factory. The blunting process is decomposed in two sub-processes connected in parallel, both viewed as distributed parameters processes and modeled through equations with partial derivatives. The mathematical model of the two sub-processes considers the delays introduced by the liquids circulation in the plant. The modeling-simulation procedure is an application of the matrix of partial derivatives of the state vector (M-pdx) method associated with Taylor series.

关键词： Automatic control systems pH control Industrial Plants Taylor series modeling and simulation RESIDUAL two-photon processes phonon-phonon interactions duotone processes control systems distributed parameter Modeling Partial derivative Parallel Lines

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Maximum Received Power Statistics within RF Reflective Enclosures for HERO/EMV Testing

Maximum Received Power Statistics within RF Reflective Enclo...

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IEEE Symposium on Electromagnetic Compatibility and Signal Integrity

作者： Hager, Carl E. Tait, Gregory B. Naval Surface Warfare Ctr Dahlgren Dahlgren VA 22448 USA

ISBN: (纸本)9781479919932

Statistical models for maximum electromagnetic fields within RF reflective enclosures (i.e. complex cavities) have historically been derived from parent distributions obtained from the central limit theorem applied to sums of random variables. However, recent work has been done to apply the Fisher-Tippett theorem and its associated generalized extreme value (GEV) distribution to model enclosure maximums directly. The purpose of this paper is to experimentally validate the GEV distribution to model maximum received power measurements within a complex cavity for use in Hazards of Electromagnetic Radiation to Ordnance (HERO) and Electromagnetic Vulnerability (EMV) testing. Distribution parameters and associated confidence intervals are statistically determined through maximum likelihood estimation (MLE) methods.

关键词： received power Enclosures Confidence intervals distributed parameter Central limit theorem radiofrequency maximum likelihood estimation statistical models (nuclear) electromagnetic volume cavity

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On the Bayesian Stability in the Empirical Bayesian Approach

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Journal of Mathematical Sciences (United States) 2017年第2期227卷 161-168页

作者： Drozhzheva, O.V. Concern “Avtomatika ” Moscow Russian Federation

The empirical Bayesian approach is considered for Bayesian stable families of prior parameter distributions. It is shown that in these cases the derivation of the estimate for the Bayesian decision function is considerably simplified. We consider a generalization of the Deely–Lindley’s Bayesian approach to the problem of empirical Bayesian estimation, and present examples of application of the obtained results. © 2017, Springer Science+Business Media, LLC.

关键词： indium decision function Bayesian inference Generalization Bayes methods Tea distributed parameter

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A New Single-ended Fault Location Method Based on Bergeron Model

A New Single-ended Fault Location Method Based on Bergeron M...

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International Conference on Materials Science and Information Technology (MSIT 2011)

作者： Xin, Jianbo Lin, Xiangning Bo, Zhiqian Prov Elect Power Res Inst Nanchang Peoples R China HUST Dept Elec Engn Wuhan Peoples R China Tsinghua Univ State Key Lab Control & Simulat Power Syst & Gene Beijing Peoples R China

ISBN: (纸本)9783037853191

On EHV transmission lines, the impact of distributed capacitance is necessary to be considered in case of fault location. A novel fault location method for single-phase grounded fault of transmission lines is presented based on the distributed parameter model of transmission line. In this method only the voltage and current of single end is used. The residual phase voltage at the fault point should have the same phase angle as the current through fault branch due to the pure resistive characteristics of the fault path impedance. By virtue of searching the minimum phase angle difference between the phase voltage along the transmission line and the fault-component current measured at the side equipped with protection, the fault distance can be located. ATP simulations are used to generate data that are supplied as inputs to the fault location algorithm.

关键词： Single-ended fault location distributed parameter Bergeron Model Phase comparison ATP simulation

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Surface feature parametrization analogous to conductive heat flow

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Journal of Computing and Information Science in Engineering 2002年第2期2卷 77-85页

作者： Marsan, Anne L. Chen, Yifan Stewart, Paul J. Manufacturing Systems Department Ford Research Laboratory Dearborn MI 48121-2053 2010 Village Road P.O. Box 2053 MD 3135 SRL United States

Direct Surface Manipulation (DSM) allows a designer to add a raised or indented feature to an existing surface. The user bounds the feature with a closed curve, and defines an influence center that indicates the point or curve of maximum displacement from the original surface. As we move radially outward from the influence center to the boundary curve, the magnitude of displacement is scaled gradually by a one-dimensional polynomial basis function whose values range from 0 to 1. In this paper we present a new technique for assigning parameter values in the radial direction, i.e., u, to points within a DSM feature. The new technique poses parameter distribution as a steady state heat conduction problem and uses a finite element method to solve for u(x, y). The new method overcomes some stringent geometric conditions inherited from a fundamentally geometric-based reparameterization scheme and allows us to work with non-star-shaped and multiply connected DSM features. Thus it allows us to apply this surface feature technique to a wider variety of surface applications. © 2002 by ASME.

关键词： new technique Finite element method basis functions Designers Diagnostic and Statistical Manual Closed curve geomorphic feature distributed parameter maximum displacement Surfaces radial direction

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Hybrid FDTD-SPICE analysis of radiated emission from PCB with integrated circuits

Hybrid FDTD-SPICE analysis of radiated emission from PCB wit...

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IEEE International Symposium on Electromagnetic Compatibility

作者： Nishizawa, A Kobidze, G Tanabe, S Mitsubishi Electr Corp Adv Technol R&D Ctr Electromech Syst Dept Amagasaki Hyogo 6618661 Japan

ISBN: (纸本)0780365690

The radiated emission from ground bouncing and transmission lines have been analyzed using the Finite Difference Time Domain (FDTD) and SPICE hybrid method. This method can consider both the non-linear electric characteristics of IC and the distributed parameters of printed circuit boards (PCB). The computed results of the electric field at 3m from the PCB were validated by the measurements. The hybrid tool allows to calculate the noise spectrum and radiation pattern. Another advantage is that this method can separate the contributions of various noise sources. This analysis tool and methodology is useful to design transmission lines and power/ground planes in PCB.

关键词： radiated emission noise spectrum Integrated circuits Transmission Lines distributed parameter Noise sources Electronic circuits Power cables

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