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Lunar and Planetary Science XXXV (2004) 1622

fringes [4], sinusoidal waves overlaying the spectra generally at higher wavenumbers (> ~1200cm-1) (Fig.1). While no such features are directly visible between 1200 cm-1 to 600 cm-1, where the major silicate IR bands occur, we cannot rule out any influence in this part of the spectrum. To avoid any

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Hydrogen loss from olivines in mantle xenoliths from ...

sinusoidal backgrounds that varied in wavelength for each sample, each grain, and each direction. These are likely interference patterns of the infrared light hitting microscopic imperfections within the olivine. Simple background subtraction of dehydrated olivine was therefore not possible. In order to obtain a flat baseline,

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Sine wave - Wikipedia

A sine wave or sinusoid is a mathematical curve that describes a smooth periodic oscillation. A sine wave is a continuous wave. It is named after the function sine, of which it is the graph. It occurs often in pure and applied mathematics, as well as physics, engineering, signal processing and many other fields.

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Sinusoidal Waveform - Electronics Hub

Jul 09, 2015· Sinusoidal Waveform Example. If a sine wave is defined as Vm¬ = 150 sin (220t), then find its RMS velocity and frequency and instantaneous velocity of the waveform after a 5 ms of time. Solution: The general equation for the sine wave is Vt = Vm sin (ωt)

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3. Meteor arrival rates – 100 Proofs that the Earth is a Globe

And if the Earth is a sphere, this variation should be sinusoidal – the distinctive smooth shape of a wave as traced out by points rotating around a circle. And this is exactly what we see. The variation in the hourly arrival rate of meteors, as observed all across the Earth, matches the prediction you would make if the Earth was a globe.

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Vol 454 doi:10.1038/nature07230 LETTERS - COMPRES

olivine–wadsleyite–ringwoodite–perovskite phase transitions5,6. ... P-wave velocity depends on whether the kinetics of the transforma- ... to 15GPa, 1,700K), a sinusoidal uniaxial stress is applied to the sample, inducing strains of 10 22–10 5. We measured stress–strain

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How to add sine functions of different amplitude and phase

How to add sine functions of different amplitude and phase In these notes, I will show you how to add two sinusoidal waves, each of different amplitude and phase, to get a third sinusoidal wave. That is, we wish to show that given E1 = E10 sinωt, (1) E2 = E20 sin(ωt+δ), (2) the sum Eθ ≡ E1 +E2 can be written in the form:

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Effect of dynamic melting on acoustic velocities in a ...

The sine wave is generated by the DDIA pumping system. The effective Young's modulus of the sample (E sample) is derived from strains of the sample and proxy as E sample = E proxy × ε proxy /ε sample, where the strain is the amplitude of the sine wave. Pressure is determined by the cell volume of olivine measured by X-ray diffraction and ...

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Sinusoidal Waveform or Sine Wave in an AC Circuit

Therefore a sinusoidal waveform has a positive peak at 90 o and a negative peak at 270 o. Positions B, D, F and H generate a value of EMF corresponding to the formula: e = Vmax.sinθ. Then the waveform shape produced by our simple single loop generator is commonly referred to as a Sine Wave …

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Nanoscale waviness of low-angle grain boundaries | PNAS

Dec 28, 2004· The impact of LAGBs on internal friction in solids, including polycrystalline olivine, is of primary interest in experimental seismic-wave attenuation research . In a wider context, engineering of grain boundaries is a way to tune bulk properties in many technologically important materials.

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Testing five of the simplest upper mantle anisotropic ...

anisotropy imaging that utilizes shear wave birefringence [Fischer et al., 2005; Fouch and Rondenay, 2006]: e.g., the non-linearity of the data kernels makes model appraisal difficult, the lack of available high-fold data sets from seismic arrays makes accurate isolation of anisotropic signals from signal generated noise difficult, and olivine

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WO2006070924A1 - Coke pushing method and coke pusher ...

Provided are a coke pushing method and a coke pusher machine which can appropriately reduce a pushing load when a lump coke is pushed out from a carbonization chamber, to thereby reduce the damage to a coke oven wall. A coke pushing method and a coke pusher machine, wherein a pushing face (22b) toward a lump coke (11) of a ram head (22) is vibrated in the pushing direction by a vibrator …

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velocity gradient - an overview | ScienceDirect Topics

In general terms, the seismological models are consistent with the hypothesis that olivine is the main (up to 60%) constituent of the upper mantle. Laboratory experiments under pressures corresponding to depths up to 750 km show that olivine undergoes phase transformations to denser phases with higher seismic wave speeds.

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Pressure dependence of thermal transport properties | PNAS

May 29, 2007· To evaluate accuracy, repeat experiments for olivine [(Mg0.9Fe0.1)2SiO4], quartz (SiO2), and NaCl are examined in detail: these and other data on electrical insulators are compared with theory. At ambient conditions, D is underestimated in proportion to the number of contacts. ... and the phase of the decaying sinusoidal temperature wave that ...

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(PDF) Energy dissipation of materials at high pressure and ...

Color Sketch of D-DIA, a deformation device with tetragonal that will be appropriate to seismic wave attenuation and the symmetry, in which large strain can be generated up to 15 GPa and 2000 K. effective modulus will define the velocity. ... Color The amplitude of sinusoidal strain of olivine at 5 GPa and 1473 K as a function of ...

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Exsolution in Ferromagnesian Olivine ofthe Divnoe Meteorite

such exsolution in ferromagnesian olivine grains in the Divnoe meteorite. The Divnoe meteorite is a granoblastic, olivine-rich primitive achondrite whose textural and mineralogical characteristics suggestthat it recrystallized extensivelydur-ing slow cooling from-10000 to -500'C (8). Olivine grains in this meteorite showa

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Thermal diffusivity and conductivity of olivine ...

Jun 15, 2004· Thermal diffusivity and conductivity of olivine, wadsleyite and ringwoodite to 20 GPa and 1373 K ... Because olivine is the principal interconnected phase in the upper mantle, ... To generate a superimposed low-frequency temperature variation, a sine wave (0.1–1.3 Hz) …

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Effect of phase transition on the P wave velocity in ...

Effect of phase transition on the P wave velocity in regions of coexisting phases: Authors: ... Our results indicate that the sinusoidal force applied to the sample in olivine-ringwoodite region has much lower bulk modulus and higher Q-1 than at in the single phase regions. Our data are consistent with a diffusion controlled model of Jackson ...

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