Xem 1-20 trên 30 kết quả Surface waves
  • This text/reference is the only one of its kind to offer the basics on surface wave mechanics and coastal processes along with the fundamentals of coastal engineering analysis and design. It also provides the necessary background from which the reader can pursue a more advanced study of the various theoretical and applied aspects of coastal hydromechanics and coastal engineering design.

    pdf331p beobobeo 01-08-2012 46 12   Download

  • 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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  • 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.

    pdf480p namde04 03-05-2013 23 6   Download

  • Rising from the depths of the North Pacific lies a fabled island, now submerged just 15 feet below the surface of the ocean. Rumors and warnings about Cortes Bank abound, but among big wave surfers, this…

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  • Global warming is the rising average temperature of Earth's atmosphere and oceans since the late 19th century and its projected continuation. Since the early 20th century, Earth's average surface temperature has increased by about 0.8 °C, with about two thirds of the increase occurring since 1980. Warming of the climate system is unequivocal, and scientists are more than 90% certain that most of it is caused by increasing concentrations of greenhouse gases produced by human activities such as deforestation and the burning of fossil fuels.

    pdf103p quynhp 21-11-2009 265 110   Download

  • TRUYỀN SÓNG MẶT - Khi các anten định xứ gần hoặc trên mặt đất, sóng không gian (Space wave) biến mất do trường phản xạ triệt tiêu tia trực tiếp trường sóng mặt (Surface wave) - Truyền sóng theo sóng mặt là mode truyền chủ yếu ở dải tần từ vài kHz đến vài chục MHz. - Suy hao công suất tín hiệu gần như tỷ lệ nghịch với R4.

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  • The Architecture of Electronic Data Carriers Before we describe the functionality of the data carriers used in RFID systems we must first differentiate between two fundamental operating principles: there are electronic data carriers based upon integrated circuits (microchips) and data carriers that exploit physical effects for data storage. Both 1-bit transponders and surface wave components belong to the latter category.

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  • The concept of acoustic wave is a pervasive one, which emerges in any type of medium, from solids to plasmas, at length and time scales ranging from sub-micrometric layers in microdevices to seismic waves in the Sun's interior. This book presents several aspects of the active research ongoing in this field. Theoretical efforts are leading to a deeper understanding of phenomena, also in complicated environments like the solar surface boundary.

    pdf0p ktcn_1 10-07-2012 36 11   Download

  • Satellite altimetry was developed in the 1960s soon after the flight of artificial satellites became a reality. From the vantage point in space, a radar altimeter is able to measure the shape of the sea surface globally and frequently. Such measurements have a wide range of applications to oceanography, geodesy, and geophysics. The results are often revolutionary. For example, in oceanography; it takes a ship weeks or months to cross the ocean making measurements while the ocean is constantly changing its circulation, temperature, and salinity.

    pdf260p crius75 02-01-2013 29 11   Download

  • Surface Acoustic Wave (SAW) devices are widely used in multitude of device concepts mainly in Micro Electro Mechanical Systems (MEMS) and communication electronics. As such, SAW based micro-sensors, actuators and communication electronic devices are well known applications of SAW technology. Due to their solid state design and fabrication compatible with other modern technologies such as Microwave Integrated Circuits (MIC), MEMS, (Charge Coupled Devices) CCD and integrated optic devices, SAW based sensors are considered to be extremely reliable....

    pdf0p 123859674 04-07-2012 30 10   Download

  • Textbooks on radio antennas and propagation have changed little over the last 50 years. Invariably they base themselves on the famous electromagnetic equations described by James Clerk Max- well, a great nineteenth-century genius of theoretical physics (Torrance, 1982). Maxwell's equations brilliantly encompassed all the electromagnetic phenomena known by his time (except photo- electric long-wave cut-off, which remained ...

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  • The book generously covers a wide range of aspects and issues related to RFID systems, namely the design of RFID antennas, RFID readers and the variety of tags (e.g. UHF tags for sensing applications, surface acoustic wave RFID tags, smart RFID tags), complex RFID systems, security and privacy issues in RFID applications, as well as the selection of encryption algorithms.

    pdf250p kimngan_1 05-11-2012 31 9   Download

  • Transmission Line and and Waveguide presents general solutions for TEM, TE, and TM waves; parallel plate waveguide; rectangular waveguide; circular waveguide; coaxial line; surface waves on a grounded dielectric sheet; stripline; microstrip line; the transverse resonant technique; wave velocities and dispersio.

    pdf67p salink 17-03-2015 16 6   Download

  • “Earth is a unique planet, possibly one of the few in the galaxy that has water. Nearly 71% of it’s surface is ocean. From space, Earth is brilliantly blue, white in places with clouds and ice, sometimes swirling with storms. At it’s surface the ocean is in constant motion with powerful currents that stretch for thousands of miles and towering waves. Beneath the ocean’s surface lie hidden mountain ranges, vast trenches tens of thousands of feet deep, immense hot springs, and huge volcanoes spewing molten rock in massive eruptions.”...

    ppt37p thachthaoxanh 24-08-2011 29 5   Download

  • Embankment crest and the toe: that is limited to the scope of protection of the embankment on the shore. Roof slope: expressed as the ratio, for example 1:3. Roof more comfortable (less steep), the embankment as a protective effect, but the price will be more expensive (for large embankment surface). Structure and size of the overlay: Overlay roof design must be capable of against the effects of currents, waves, etc. Conventional coatings include removable components assembled together. Gap between them so that water inside to escape, to avoid the effects of water pressure in the soil....

    pdf38p thachthaoxanh 23-08-2011 27 4   Download

  • An ocean wave is an undulation of the sea surface. Wave crest,Wave trough,Wave height,Wave lengt,Wave period Progressive waves move across the sea surface.,Standing waves oscillate about a fixed point. Wind velocity : Wind duration, Fetch (distance over which wind blows), Simply put, wave size increases as all these factors increase.

    ppt30p thachthaoxanh 24-08-2011 27 3   Download

  • Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí hóa hoc quốc tế đề tài : Physical properties of metal-doped zinc oxide films for surface acoustic wave application

    pdf9p sting03 06-02-2012 24 3   Download

  • 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 effect creates the effect of card choreography by segmenting layers into numerous cards and then controlling all geometric aspects of the cards using a second layer. For example, Card Dance can simulate an extruded pin sculpture, a crowd “doing the wave,” or letters floating on the surface of a pond.

    pdf32p emilynguyen 07-08-2009 249 148   Download

  • Review of Waves and Transmission Lines At low RF, a wire or a line on a printed circuit board can be used to connect two electronic components. At higher frequencies, the current tends to concentrate on the surface of the wire due to the skin effect.

    pdf57p vaseline 30-08-2010 72 24   Download

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