21 -26 August University of Exeter
... Investigating the dynamics of the interstellar medium (ISM) is key to gaining insight into the formation of starforming filaments in molecular clouds (MCs). A plethora of numerical and analytical models associate the origin of this filamentary structure to the interplay between self-gravity and magn ...
... Investigating the dynamics of the interstellar medium (ISM) is key to gaining insight into the formation of starforming filaments in molecular clouds (MCs). A plethora of numerical and analytical models associate the origin of this filamentary structure to the interplay between self-gravity and magn ...
An ultrasmall wavelength-selective channel drop switch
... Light propagating in the PC waveguide is coupled with a nanocavity and emitted as a drop signal under a resonant condition. The proposed switch has been fabricated by silicon micromachining. The drop efficiency has been controlled by 12.5 dB and gap change of 600 nm. © 2009 American Institute of Phy ...
... Light propagating in the PC waveguide is coupled with a nanocavity and emitted as a drop signal under a resonant condition. The proposed switch has been fabricated by silicon micromachining. The drop efficiency has been controlled by 12.5 dB and gap change of 600 nm. © 2009 American Institute of Phy ...
Spectropolarimetry of the massive post
... Here, we address the issue by investigating the circumstellar ejecta of two yellow hypergiants, IRC +10420 and HD 179821. These objects are thought to have evolved off the post-Red Supergiant branch and are still surrounded by mass ejected during a previous mass losing phase. Only a few yellow hyper ...
... Here, we address the issue by investigating the circumstellar ejecta of two yellow hypergiants, IRC +10420 and HD 179821. These objects are thought to have evolved off the post-Red Supergiant branch and are still surrounded by mass ejected during a previous mass losing phase. Only a few yellow hyper ...
Manipulating atoms with photons (Nobel lecture of C. Cohen
... F52 a v where a is a friction coefficient. By using three pairs of counterpropagating laser waves along three orthogonal directions, one can damp the atomic velocity in a very short time, on the order of a few microseconds, achieving what is called an ‘‘optical molasses’’ (Chu et al., 1985). The Dop ...
... F52 a v where a is a friction coefficient. By using three pairs of counterpropagating laser waves along three orthogonal directions, one can damp the atomic velocity in a very short time, on the order of a few microseconds, achieving what is called an ‘‘optical molasses’’ (Chu et al., 1985). The Dop ...
OPTICAL FILTER COATINGS
... Optics interference filters enable rapid and accurate measurement of the amplitude of specific spectral lines. This combination has an enormous throughput advantage since the collecting area of filters is very large compared to instrumental slits. Additionally, interference filters enable the viewin ...
... Optics interference filters enable rapid and accurate measurement of the amplitude of specific spectral lines. This combination has an enormous throughput advantage since the collecting area of filters is very large compared to instrumental slits. Additionally, interference filters enable the viewin ...
CURTIN INSTITUTE OF RADIO ASTRONOMY POST
... black hole systems in our Galaxy. Black holes or neutron stars accreting matter from a less-evolved donor star emit steady, collimated outflows known as jets. These radio-emitting jets can be detected with Very Long Baseline Interferometry, combining the signals detected by radio telescopes spread o ...
... black hole systems in our Galaxy. Black holes or neutron stars accreting matter from a less-evolved donor star emit steady, collimated outflows known as jets. These radio-emitting jets can be detected with Very Long Baseline Interferometry, combining the signals detected by radio telescopes spread o ...
U17301 - 3B Scientific
... E7 Light ray shift by glass planparallel plate (U17300/U17301) If a light ray passes through a planparallel plate its direction is not changed. The outgoing ray is shifted in accordance with the incoming one. The shift d can be estimated with respect to the thickness h of the plate using the formula ...
... E7 Light ray shift by glass planparallel plate (U17300/U17301) If a light ray passes through a planparallel plate its direction is not changed. The outgoing ray is shifted in accordance with the incoming one. The shift d can be estimated with respect to the thickness h of the plate using the formula ...
A pyramid wavefront sensor with no dynamic modulation
... case of uniform illumination across the sub-aperture. A function for W~ ðx; yÞ with a much higher spatial frequency than the inverse of the sampling sub-aperture will be better suited at the edges but it will produce a larger amount of scattered light. On this basis one should find a compromise and c ...
... case of uniform illumination across the sub-aperture. A function for W~ ðx; yÞ with a much higher spatial frequency than the inverse of the sampling sub-aperture will be better suited at the edges but it will produce a larger amount of scattered light. On this basis one should find a compromise and c ...
Light & Matter: Absorption and Scattering
... • It is possible for the incident photons to interact with the molecules in such a way that energy is either gained or lost so that the scattered photons are shifted in frequency. This is called inelastic scattering including Raman scattering (~1 in 107 photons) • Raman scattering produces scat ...
... • It is possible for the incident photons to interact with the molecules in such a way that energy is either gained or lost so that the scattered photons are shifted in frequency. This is called inelastic scattering including Raman scattering (~1 in 107 photons) • Raman scattering produces scat ...
Barium Stars: Theoretical Interpretation
... characteristic for AGB and post-AGB stars, but are in an earlier evolutionary stage (main sequence dwarfs, subgiants, red giants). They are believed to form in binary systems, where a more massive companion evolved faster, produced the s-elements during its AGB phase, polluted the present barium sta ...
... characteristic for AGB and post-AGB stars, but are in an earlier evolutionary stage (main sequence dwarfs, subgiants, red giants). They are believed to form in binary systems, where a more massive companion evolved faster, produced the s-elements during its AGB phase, polluted the present barium sta ...
ppd_hia
... TW Hya: Evidence for “Pebbles” • 3.5 cm radio emission – not variable: weeks to years ...
... TW Hya: Evidence for “Pebbles” • 3.5 cm radio emission – not variable: weeks to years ...
![arXiv:1210.2471v1 [astro-ph.EP] 9 Oct 2012 Exoplanet Detection](http://s1.studyres.com/store/data/015975823_1-e4b4b3613f38bbff39746aa9bc12073b-300x300.png)
arXiv:1210.2471v1 [astro-ph.EP] 9 Oct 2012 Exoplanet Detection
... of the parent star. Although the emission of exoplanets is indeed quite faint, it is generally the problem of detecting this emission in the proximity of the much brighter stellar source that presents the most severe practical obstacle to direct detection. The disentangling of stellar and planetary ...
... of the parent star. Although the emission of exoplanets is indeed quite faint, it is generally the problem of detecting this emission in the proximity of the much brighter stellar source that presents the most severe practical obstacle to direct detection. The disentangling of stellar and planetary ...
spatially resolved star formation history of milky way satellites
... dwarf galaxies and apply our method to the case of the Carina dSph galaxy. The first section of the work presents a high quality photometric catalogue of Milky Way satellites in the outer Halo. This catalogue will then provide important information about the structural properties and stellar populat ...
... dwarf galaxies and apply our method to the case of the Carina dSph galaxy. The first section of the work presents a high quality photometric catalogue of Milky Way satellites in the outer Halo. This catalogue will then provide important information about the structural properties and stellar populat ...
Physics – A World Communicates
... They are capable of creating an electric response in the medium that they impact on They have frequencies related directly to the vibrational frequency of the source Can be refracted and reflected, when passing through mediums of different densities ...
... They are capable of creating an electric response in the medium that they impact on They have frequencies related directly to the vibrational frequency of the source Can be refracted and reflected, when passing through mediums of different densities ...
Understanding Radiance, Irradiance and Radiant Flux
... off in proportion to the distance squared from the source, since the total power is constant and it is spread over an area that increases with the distance squared from the radiation source. To compare the irradiance of different sources, one must take into account the distance from the source. A 50 ...
... off in proportion to the distance squared from the source, since the total power is constant and it is spread over an area that increases with the distance squared from the radiation source. To compare the irradiance of different sources, one must take into account the distance from the source. A 50 ...
Soliton Interaction in Fiber Bragg Gratings: Optical AND Gate Formation
... amplitude, Γ = .005m−1W −1 is the nonlinear coefficient, Vg = c/nef f is the fiber group velocity, and nef f = 1.45 is the effective refractive index. For region lengths of L1 = L3 = 5.11cm, L2 = 2.34, and chirp parameter slopes of σ1 = −σ3 = −888.594m−2, and chirp parameter σ2 = −45.41m−1, it can b ...
... amplitude, Γ = .005m−1W −1 is the nonlinear coefficient, Vg = c/nef f is the fiber group velocity, and nef f = 1.45 is the effective refractive index. For region lengths of L1 = L3 = 5.11cm, L2 = 2.34, and chirp parameter slopes of σ1 = −σ3 = −888.594m−2, and chirp parameter σ2 = −45.41m−1, it can b ...
Temperature-Dependence of the HCl Spectrum: A Simulation
... where E photon is the energy of the absorbed light. For most molecules, Δ E rovib is on the order of ~103 cm-1, which puts E photon in the infrared region of the EM spectrum. Typically, E vib is larger than E rot by at least a factor of 10, so that rotational energies are actually small corrections ...
... where E photon is the energy of the absorbed light. For most molecules, Δ E rovib is on the order of ~103 cm-1, which puts E photon in the infrared region of the EM spectrum. Typically, E vib is larger than E rot by at least a factor of 10, so that rotational energies are actually small corrections ...
Astronomical spectroscopy
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.