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Modeling Moiré: Visual Beat Effects in Nature and Optical Metrology
... varied in a ratio that could be changed by the user, so that the resulting ellipses were truly concentric. In the second, the semi-major axis was kept the same, but the semi-minor axis was varied, creating a grating that looked like a cat’s eye. Figures 2 (b) and 2 (c) show the screenshots of the M ...
... varied in a ratio that could be changed by the user, so that the resulting ellipses were truly concentric. In the second, the semi-major axis was kept the same, but the semi-minor axis was varied, creating a grating that looked like a cat’s eye. Figures 2 (b) and 2 (c) show the screenshots of the M ...
Elements of astronomy
... will be true of every star to which the telescope is directed from which we conclude that all objects upon the firmament describe circles at right angles to its axis, each object always remaining at the same distance from the pole. The same observations prove that this movement of rotation of all th ...
... will be true of every star to which the telescope is directed from which we conclude that all objects upon the firmament describe circles at right angles to its axis, each object always remaining at the same distance from the pole. The same observations prove that this movement of rotation of all th ...
QAT 2014 Answers part B
... that all research discoveries should be available to anyone interested, especially to those who are intending research along similar lines. In this way the trend towards advancing knowledge is most likely to be maximised. There is a common saying about not needing to “reinvent the wheel”, but whenev ...
... that all research discoveries should be available to anyone interested, especially to those who are intending research along similar lines. In this way the trend towards advancing knowledge is most likely to be maximised. There is a common saying about not needing to “reinvent the wheel”, but whenev ...
Precision interferometer
... Thomas Young was one of the first to design a method for producing such an interference pattern. He allowed a single, narrow beam of light to fall on two narrow, closely spaced slits. Opposite the slits he placed a viewing screen. Where the light from the two slits struck the screen, a regular patte ...
... Thomas Young was one of the first to design a method for producing such an interference pattern. He allowed a single, narrow beam of light to fall on two narrow, closely spaced slits. Opposite the slits he placed a viewing screen. Where the light from the two slits struck the screen, a regular patte ...
Department of Physics, Chemistry and Biology
... gloriosa (C. gloriosa) has left-handed polarization. In this work the polarizing properties and structural characteristics of the cuticles of these two beetles are investigated with two different techniques: scanning electron microscopy (SEM) and Mueller-matrix spectroscopic ellipsometry (MMSE). SEM ...
... gloriosa (C. gloriosa) has left-handed polarization. In this work the polarizing properties and structural characteristics of the cuticles of these two beetles are investigated with two different techniques: scanning electron microscopy (SEM) and Mueller-matrix spectroscopic ellipsometry (MMSE). SEM ...
Negative Group Velocity - Physics Department, Princeton University
... We see from eq. (3) that if the index of refraction decreases rapidly enough with frequency, the group velocity can be negative. It is well known that the index of refraction decreases rapidly with frequency near an absorption line, where “anomalous” wave propagation effects can occur [12]. However, ...
... We see from eq. (3) that if the index of refraction decreases rapidly enough with frequency, the group velocity can be negative. It is well known that the index of refraction decreases rapidly with frequency near an absorption line, where “anomalous” wave propagation effects can occur [12]. However, ...
shell properties
... determined the center of curvature for each shell, and measured the azimuthally averaged intensity along curved arcs parallel to the shell, in sectors of 20◦ –50◦ wide. Pixels affected by stars, galaxies or other small defects were ignored. Radial bins of 0.00 5 (∼1 pixel) were adopted for the CFHT ...
... determined the center of curvature for each shell, and measured the azimuthally averaged intensity along curved arcs parallel to the shell, in sectors of 20◦ –50◦ wide. Pixels affected by stars, galaxies or other small defects were ignored. Radial bins of 0.00 5 (∼1 pixel) were adopted for the CFHT ...
Was a cloud-cloud collision the trigger of the recent star formation in
... cloud/flow collision forming a gravitationally unstable enhanced density layer. Aims. This work tests cloud-cloud collisions as the triggering mechanism for star formation in the Serpens Main Cluster as has been suggested by previous work. Methods. A set of smoothed particle hydrodynamics (SPH) simu ...
... cloud/flow collision forming a gravitationally unstable enhanced density layer. Aims. This work tests cloud-cloud collisions as the triggering mechanism for star formation in the Serpens Main Cluster as has been suggested by previous work. Methods. A set of smoothed particle hydrodynamics (SPH) simu ...
96-ws9-reg-temp - School of Physics
... The equation for simple harmonic motion is given by x = Asin(t). The speed is given by v = A cos(t). At the lowest point the speed is a maximum (t = 0), hence v = A = 2.8 s-1 0.15 m = 0.42 m.s-1. b. The acceleration is a = dv/dt = -2A sin(t). At the end of its path the acceleration is a maxi ...
... The equation for simple harmonic motion is given by x = Asin(t). The speed is given by v = A cos(t). At the lowest point the speed is a maximum (t = 0), hence v = A = 2.8 s-1 0.15 m = 0.42 m.s-1. b. The acceleration is a = dv/dt = -2A sin(t). At the end of its path the acceleration is a maxi ...
Optical Fiber Sensors Guide
... formation of regions of low density around broken Ge-Si bonds (stress relief model). Alternatively, Bernardin et al.[5] suggested that the UV irradiation may induce rearrangement of the molecular structure, leading to a compaction of the glass matrix (referred to as the compaction model). Different ...
... formation of regions of low density around broken Ge-Si bonds (stress relief model). Alternatively, Bernardin et al.[5] suggested that the UV irradiation may induce rearrangement of the molecular structure, leading to a compaction of the glass matrix (referred to as the compaction model). Different ...
Niznik - Tampereen teknillinen yliopisto
... coating. It has been shown that surface textures on their own can decrease reflection to approximately 10 % and together with an antireflection coating (ARC) light reflection is further decreased to below 4 % (Baker-Finch & McIntosh, 2010). In order, to determine the beneficial effects of surface te ...
... coating. It has been shown that surface textures on their own can decrease reflection to approximately 10 % and together with an antireflection coating (ARC) light reflection is further decreased to below 4 % (Baker-Finch & McIntosh, 2010). In order, to determine the beneficial effects of surface te ...
Forming different planetary systems ∗
... One of the most fascinating features for HJs is that some HJs have orbits that are misaligned with respect to the spin of their host stars (Winn et al. 2010; Triaud et al. 2010). The sky-projected angle between the stellar spin and the planet’s orbital motion can be probed with the Rossiter-McLaughl ...
... One of the most fascinating features for HJs is that some HJs have orbits that are misaligned with respect to the spin of their host stars (Winn et al. 2010; Triaud et al. 2010). The sky-projected angle between the stellar spin and the planet’s orbital motion can be probed with the Rossiter-McLaughl ...
Astronomy 112: The Physics of Stars Class 1 Notes
... We can actually learn a tremendously larger amount by measuring the spectrum of stars. That’s because a real stellar spectrum isn’t just a simple continuous function like a blackbody. Instead, there are all sorts of spiky features. These were first studied by the German physicist Fraunhofer in 1814 ...
... We can actually learn a tremendously larger amount by measuring the spectrum of stars. That’s because a real stellar spectrum isn’t just a simple continuous function like a blackbody. Instead, there are all sorts of spiky features. These were first studied by the German physicist Fraunhofer in 1814 ...
Waves and Optics - School of Physics
... The equation for simple harmonic motion is given by x = Asin(ωt). The speed is given by v = ωA cos(ωt). At the lowest point the speed is a maximum (t = 0), hence v = ωA = 2.8 s-1 × 0.15 m = 0.42 m.s-1. b. The acceleration is a = dv/dt = -ω2A sin(ωt). At the end of its path the acceleration is a maxi ...
... The equation for simple harmonic motion is given by x = Asin(ωt). The speed is given by v = ωA cos(ωt). At the lowest point the speed is a maximum (t = 0), hence v = ωA = 2.8 s-1 × 0.15 m = 0.42 m.s-1. b. The acceleration is a = dv/dt = -ω2A sin(ωt). At the end of its path the acceleration is a maxi ...
Limits on the Size and Orbit Distribution of Main Belt Comets
... been only limited heliocentric mixing of the asteroids, MBCs should only be found outside the snowline. Furthermore, the existence and properties of a large sample of MBCs will provide tests of asteroid thermal models. In an attempt to identify more MBCs when only two were known, Hsieh & Jewitt (200 ...
... been only limited heliocentric mixing of the asteroids, MBCs should only be found outside the snowline. Furthermore, the existence and properties of a large sample of MBCs will provide tests of asteroid thermal models. In an attempt to identify more MBCs when only two were known, Hsieh & Jewitt (200 ...
Principles of Interference
... when the relative time delay exceeds the coherence time. An interferometer based on amplitude division, is generally used to measure the temporal coherence of a source, where it compares a light wave with itself at different moments in time, c ; this type of coherence properties encode the spectral ...
... when the relative time delay exceeds the coherence time. An interferometer based on amplitude division, is generally used to measure the temporal coherence of a source, where it compares a light wave with itself at different moments in time, c ; this type of coherence properties encode the spectral ...
Environmental dependence of bulge
... Sizes and environment Stellar masses have been obtained from the MPA-JHU DR7, derived through spectral energy distribution fitting using the Bruzual & Charlot (2003) synthesis population models, and converted to a Chabrier (2003) initial mass function (IMF), in line with the theoretical models desc ...
... Sizes and environment Stellar masses have been obtained from the MPA-JHU DR7, derived through spectral energy distribution fitting using the Bruzual & Charlot (2003) synthesis population models, and converted to a Chabrier (2003) initial mass function (IMF), in line with the theoretical models desc ...
Temperature-dependent refractive index of silicon and germanium
... These Sellmeier models are our best statistical representation of the measured data over the complete ineasured ranges of wavelength and temperature. All of the tabulated values for the refi-active index of Si and Ge below have been calculated using this Sellmeier model based on our measured data us ...
... These Sellmeier models are our best statistical representation of the measured data over the complete ineasured ranges of wavelength and temperature. All of the tabulated values for the refi-active index of Si and Ge below have been calculated using this Sellmeier model based on our measured data us ...
Nonlinear optics in daily life
... potential, such as for very high resolution lithography and accelerating elementary particles to very high energy, but since EUV is not yet in commercial application, it will not be discussed here. 2.1.1 Harmonic generation Second harmonic generation (SHG) of the Nd:YAG laser (wavelength = 1.06 μm) ...
... potential, such as for very high resolution lithography and accelerating elementary particles to very high energy, but since EUV is not yet in commercial application, it will not be discussed here. 2.1.1 Harmonic generation Second harmonic generation (SHG) of the Nd:YAG laser (wavelength = 1.06 μm) ...
Astronomical spectroscopy
![](https://commons.wikimedia.org/wiki/Special:FilePath/Star-Spectroscope.jpg?width=300)
Astronomical spectroscopy is the study of astronomy using the techniques of spectroscopy to measure the spectrum of electromagnetic radiation, including visible light, which radiates from stars and other hot celestial objects. Spectroscopy can be used to derive many properties of distant stars and galaxies, such as their chemical composition, temperature, density, mass, distance, luminosity, and relative motion using Doppler shift measurements.