Wave interactions

Xem 1-20 trên 31 kết quả Wave interactions
  • Tham khảo sách 'seismic waves, research and analysis_1', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • Low-frequency acoustic energy released within the Earth's crust and mantle mostly propagates - depending on the density and elasticity of the medium - through several types of seismic waves categorized as body waves (longitudinal P and transverse S) or surface waves (long L and ground roll R). The importance of seismic wave research lies not only in our ability to understand and predict earthquakes and tsunamis, it also reveals information on the Earth's composition and features in much the same way as it led to the discovery of Mohorovicic's discontinuity....

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  • This chapter provides the basis for the discussion in the following chapters by summarizing the fundamental concepts and the quantum theory concerning the interaction between electrons and photons in a form that is convenient for theoretical analysis of semiconductor lasers [1–9]. First, quantization of electromagnetic fields of optical waves is outlined, and the concept of a photon is clarified. Quantum theory expressions for coherent states are also given. Then the quantum theory of electron–photon interactions and the general characteristics of optical transitions are explained. ...

    pdf20p vuongpm 16-05-2010 92 16   Download

  • This book presents a fluid mechanics perspective to the dynamics of fronts and vortices and their interaction with waves in geophysical flows. It provides a basic physical background for modeling coherent structures in a geophysical context, and it gives essential information on advanced topics such as spontaneous wave emission and wavemomentum transfer in geophysical flows. Based on a set of lectures by leading specialists, this text is targeted at graduate students, researchers and engineers in geophysics and environmental fluid mechanics. ...

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  • Shock wave–boundary-layer interactions(SBLIs) occur when a shock wave and a boundary layer converge and, since both can be found in almost every supersonic flow, these interactions are commonplace. The most obvious way for them to arise is for an externally generated shock wave to impinge onto a surface on which there is a boundary layer.

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  • Shock wave–boundary-layer interactions (SBLIs) occur when a shock wave and a boundary layer converge and, since both can be found in almost every supersonic flow, these interactions are commonplace. The most obvious way for them to arise is for an externally generated shock wave to impinge onto a surface on which there is a boundary layer.

    pdf0p bachduong1311 10-12-2012 11 0   Download

  • This book is idented for three groups: students and professors of structural and ocean engineering, engineers and scientists in academic institutions, goverment laboratories, and inductries involved in research on offshore installations , espetically fluid structure soil interaction, and practicing professional engineers who considers conceptual design and need to employ dynamic analysis to evaluate facilities contructed offshore

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  • Biology is chemistry on an impressive scale. It is a product of evolution, the outcome of countless random experiments, resulting in the exquisite complexity of the biological world of which we are a part. Setting aside any philosophical considerations, living organisms - including ourselves - are simply nothing more than wet, floppy bags of chemistry: complicated mixtures of molecules interacting in a multitude of ways. All this takes place mainly in ...

    pdf196p banhkem0908 24-11-2012 26 12   Download

  • This book is based on the contributions of several authors in electromagnetic waves propagations. Several issues are considered. The contents of most of the chapters are highlighting non classic presentation of wave propagation and interaction with matters. This book bridges the gap between physics and engineering in these issues. Each chapter keeps the author notation that the reader should be aware of as he reads from chapter to the other. The author’s notations are kept in order to eliminate any possible unintentional errors that might lead to confusion.

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  • The heat radiation from gas flaring greatly affects the surrounding environment and particular crops planted within the vicinity of gas flare stations (Abdulkareem and Odigure, 2002). It also has a devastating effect on microorganisms and aquatic life. Heat radiation from gas flaring also causes an increase in heat waves hence there is the possibility that habitants of Niger-Delta Area, where the gas flaring stations are located will suffer heart stroke, heart attacks and other ailments aggravated by the heat (Odigure et al., 2003).

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  • Three physical measures of the 160 films are used in the analyses below, and one interaction between them. First, the average shot lengths (ASLs) of each filmwere determined. Segmenting films into shots has been a tedious and ongoing process, starting with the measurements by Cutting et al (2010). Subsequently, each filmhas been gone over several times by several individuals both with computer assistance and by hand. Although we occasionally find additional transitions previously missed, we are confident that we have found greater than 99% of themin each film....

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  • Ads for one Macintosh computer bragged that it could do an arithmetic calculation in less time than it took for the light to get from the screen to your eye. We find this impressive because of the contrast between the speed of light and the speeds at which we interact with physical objects in our environment. Perhaps it shouldn’t surprise us, then, that Newton succeeded so well in explaining the motion of objects, but was far less successful with the study of light.

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  • A  numerical  model  based  on  the  2D  shallow  water  equations  was  developed  using  the  Finite Volume Method. The model was applied to the study of long wave propagation and runup  on  a  conical  island.  The  simulated  results  by  the  model  were  compared  with  published  experimental  data  and  analyzed  to  understand  more  about  the  interaction  processes  between  the  long waves and conical island in terms of water profile and wave runup height.

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  • Chapter 2 - Structure and properties of organic molecules. To understand these aspects of molecular structure we need to consider how the atomic orbitals on an atom mix to form hybrid atomic orbitals and how orbitals on different atoms combine to form molecular orbitals. In this chapter, we look more closely at how combinations of orbitals account for the shapes and properties we observe in organic molecules.

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  • Table 1 shows the theoretical ratio of power transmitted between antennas of different polarization. These ratios are seldom fully achieved due to effects such as reflection, refraction, and other wave interactions, so some practical ratios are also included.

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  • The inner magnetosphere is an important region of space plasma because it is one of the “kitchens” for space weather effects. The scientific understanding of this region is important for predicting the interaction between space environmental conditions and human activities. The inner magnetospheric plasma is a unique composition of different plasma particles and waves. It covers a huge plasma energy range with spatial and time variations of many orders of magnitude.

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  • The purpose of this monograph is to formulate a quantitative and self-consistent theoretical approach to wave–particle interactions occurring in space plasmas, and present a logical development of the subject. In the Earth’s magnetosphere, Nature has given us a plasma laboratory that is accessible to observations made by radio, magnetic and electric instruments on the ground, and a great variety of instruments aboard rockets and Earth-orbiting satellites. Spacecraft are making similar observations in the more distant solar system.

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  • The paper presents the results of a numerical study on the interaction of waves and a submerged breakwater. The numerical study is the application of an advanced numerical model named as CMED, which is based on the Narvier-Stokes equations and VOF (Volume of Fluid) method, and has been previously developed by the author. The consideration is paid for the investigation on the influence of the characteristics of the breakwater on the variation of some parameter coefficients, such as reflection, transmission and energy dissipation coefficients.

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  • While interacting socially, people are aware of and react to the feedback that they receive by the other people in an environment. They adjust their body posture, their facial expressions, and their general presentation. These adjustments are made not to be artificial but to convey appropriate social information for the situation.

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  • Techniques for non-invasive Breslow determination use either mechanical or electromagnetic waves. A wave is the propagation of a perturbation inducing reversible variations of local physical properties. It transports energy but no matter. Ultrasounds and optical waves are used mainly because of their innocuousness. In the next paragraphs, ultrasonography then several optical techniques will be developed. Basic physical principles of each type of wave interaction with skin will be described then accuracy of Breslow index determination by such techniques will be given.

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