Results 61 to 70 of about 14,116,486 (379)
Dizhen xuebao, 2018 本文介绍了全球主要地震机构对2008年5月12日汶川地震参数的速报和修订情况，分析了美国地质调查局国家地震信息中心测定的面波震级。通过对比198个全球地震台站测定的面波震级和面波周期，得出如下结论：测定面波震级偏大的台站主要分布在震中的东北方向，测定面波震级偏小的台站主要分布在震中的西南和东南方向，面波周期偏小的台站主要分布在震中东北方向。由于此次地震破裂方向是以北东向单侧破裂为主，且地震多普勒效应导致震中东北方向振动加强，因此该方向上的面波震级偏大，地震烈度衰减慢；而震中西南方向的振动减弱 ...
Ruifeng Liu, Liye Zou, Liwen Zhang
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Reverse Doppler Effect of Sound
, 2009 We report observation of reverse Doppler effect in a double negative acoustic metamaterial. The metamaterial exhibited negative phase velocity and positive group velocity.
C. Caloz +6 more
core +1 more source
Christian Doppler and the Doppler effect
Eos, Transactions American Geophysical Union, 1984 A summary is given of Doppler's life and career. He was born 180 years ago on November 29, 1803, in Salzburg, Austria. He died on March 17, 1853 in Venice. The effect bearing his name was first announced in a presentation before the Royal Bohemian Society of the Sciences in Prague on May 25, 1842.
openaire +1 more source
Experimental Study of LoRa Modulation Immunity to Doppler Effect in CubeSat Radio Communications
IEEE Access, 2019 Currently, LoRa technology is one of the most promising technologies in satellite Internet of Things. Particularly those based on satellite constellations in low Earth orbit, including the CubeSat nanosatellite constellations.
A. Doroshkin +4 more
semanticscholar +1 more source
Derivation of general Doppler effect equations
JOURNAL OF ADVANCES IN PHYSICS, 2020 In this paper, we will derive the general equations for Doppler effect. It will be proved that regardless of the nature of the emitted waves and the medium through which the waves propagate the formula always has the same form and is identical to the ...
Miloš Čojanović
semanticscholar +1 more source
Arthritis Care &Research, Accepted Article.Objective We aimed to validate the Pediatric Arthritis Ultrasound Scoring System (PAUSS) for upper extremity joints in children with juvenile idiopathic arthritis (JIA). Methods Children with JIA were evaluated for elbow, wrist, or finger arthritis by clinical examination (CE) and musculoskeletal ultrasound (MSUS) with images scored according to the ...
Patricia Vega‐Fernandez +12 more
wiley +1 more source
Sharing a common origin between the rotational and linear doppler effects [PDF]
, 2017 The well-known linear Doppler effect arises from the linear motion between source and observer, while the less well-known rotational Doppler effect arises from the rotational motion.
Allen +40 more
core +1 more source
Defect Analysis of the β– to γ–Ga2O3 Phase Transition
Advanced Functional Materials, EarlyView.The role of defects at all the relevant stages of the β$\beta$‐ to γ$\gamma$‐Ga2O3 polymorph transition is investigated using a multi method approach. The positron annihilation spectroscopy based results show that the defect density decreases after the transition, and that changes in defect configuration within the γ phase occur with increasing ...
Umutcan Bektas +9 more
wiley +1 more source
ADCP Discharge Measurements on the River Danube: Post-Processing and Correction of Data
Slovak Journal of Civil Engineering, 2019 Accurate measurements and analyses of river discharges are one of the key tasks of hydrology. Nowadays, the traditional methods of discharge measurements are being supplemented or even replaced by novel approaches that utilize state-of-the-art ...
Výleta Roman, Valent Peter
doaj +1 more source
Optimal nonlinear filtering of MPSK signals in the presence of a Doppler frequency shift
Российский технологический журнал, 2022 Objectives. Phase-shift keyed (PSK) signals are widely used in many telecommunication, communication, and cellular information transmission systems. Phase-shift keying provides a higher noise immunity than amplitude and frequency modulations do.
G. V. Kulikov, T. T. Do, R. R. Usmanov
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