Radio properties of a complete sample of nearby groups of galaxies
... low-frequency GMRT radio images of the nearby (<80 Mpc) central brightest group ellipticals from the high richness CLoGS sub-sample are presented for the first time at 235 and 610 MHz. Using the sensitivity to older electron populations at 235 MHz and the resolution of 610 MHz as a key to identify p ...
... low-frequency GMRT radio images of the nearby (<80 Mpc) central brightest group ellipticals from the high richness CLoGS sub-sample are presented for the first time at 235 and 610 MHz. Using the sensitivity to older electron populations at 235 MHz and the resolution of 610 MHz as a key to identify p ...
The evolution of massive stars and their spectra
... observables of massive stars can be strongly influenced by a radiatively driven stellar wind that is characteristic of these stars. The effects of mass loss on the observables depend on the initial mass and metallicity, since they are in general more noticeable in MS stars with large initial masses, ...
... observables of massive stars can be strongly influenced by a radiatively driven stellar wind that is characteristic of these stars. The effects of mass loss on the observables depend on the initial mass and metallicity, since they are in general more noticeable in MS stars with large initial masses, ...
Polarization-insensitive high-dispersion total internal reflection
... grating period. For long periods, the characteristic of efficiency versus depth also departs from a typical sinusoidal behavior8 into one with multiple peaks, as shown in Fig. 3(b). This change of behavior is responsible for the marked jump in optimal grating depth for long grating periods, as shown ...
... grating period. For long periods, the characteristic of efficiency versus depth also departs from a typical sinusoidal behavior8 into one with multiple peaks, as shown in Fig. 3(b). This change of behavior is responsible for the marked jump in optimal grating depth for long grating periods, as shown ...
astronomy and the limits of vision
... population sets its festivals and fast periods by the visibility of the thin crescent moon and times its daily prayers on astronomical events. The ancient Egyptians, Mayans, and Aztecs based their calendars and festivals on the heliacal risings of Sirius, Venus, and the Pleiades. Neolithic man appar ...
... population sets its festivals and fast periods by the visibility of the thin crescent moon and times its daily prayers on astronomical events. The ancient Egyptians, Mayans, and Aztecs based their calendars and festivals on the heliacal risings of Sirius, Venus, and the Pleiades. Neolithic man appar ...
Prospects for atom interferometry
... determined. The device can therefore be used as a gyroscope with a sensitivity which depends on how precisely the resulting interference fringes allow D U to be measured. Until the 1920s, no one had ever considered making such interferometers with matter sources because the wave-like nature of matte ...
... determined. The device can therefore be used as a gyroscope with a sensitivity which depends on how precisely the resulting interference fringes allow D U to be measured. Until the 1920s, no one had ever considered making such interferometers with matter sources because the wave-like nature of matte ...
radiation and matter interaction in strong magnetic field of accreting
... how it has happened that I am in place where I am. For certain I am grateful for the chain of events and contacts in my life, which have resulted in this day. This thesis has my name on it, however, it is also a result of efforts of many people who have influenced indirectly on this work. Many of th ...
... how it has happened that I am in place where I am. For certain I am grateful for the chain of events and contacts in my life, which have resulted in this day. This thesis has my name on it, however, it is also a result of efforts of many people who have influenced indirectly on this work. Many of th ...
Intraday Variability in Quasars and BL LAC Objects
... scattering of the relativistic electrons with the low-energyphotons emitted by them wouldquickly lead to catastrophic cooling and unobserved high X-ray fluxes (Hoyle et al 1966) unless the objects were close by. This led to the suggestion of bulk relativistic motion(Rees 1966, Woltjer 1966). VLBIobs ...
... scattering of the relativistic electrons with the low-energyphotons emitted by them wouldquickly lead to catastrophic cooling and unobserved high X-ray fluxes (Hoyle et al 1966) unless the objects were close by. This led to the suggestion of bulk relativistic motion(Rees 1966, Woltjer 1966). VLBIobs ...
Mach Zehnder Interferometer and its Applications
... variations such as temperature, refractive index, strain etc. while reference arm is kept isolated from variations. Combined output at the MZI output port has the interference component according to the optical phase difference between two arms. The change induced in the sensing arm by any of the me ...
... variations such as temperature, refractive index, strain etc. while reference arm is kept isolated from variations. Combined output at the MZI output port has the interference component according to the optical phase difference between two arms. The change induced in the sensing arm by any of the me ...
Full THESIS in PDF - Leiden Observatory
... The energy eigenstates Ei are molecule dependent and the allowed transitions between states are described by selection rules, resulting in a unique set of possible photon frequencies for each molecular species. The reverse process, excitation of energy states, depends on the physical environment, in ...
... The energy eigenstates Ei are molecule dependent and the allowed transitions between states are described by selection rules, resulting in a unique set of possible photon frequencies for each molecular species. The reverse process, excitation of energy states, depends on the physical environment, in ...
determination of the distance to the galactic centre nigel clayton
... Although, because of the extreme visual extinction, none are at the Galactic centre itself, most are within 4o (Majaess et al. 2010, fig. 1). The value of Ro was taken to be the mean distance of the employed set of RR Lyraes, which was determined to be 8.1 0.6 kpc. As the set is large, the stated ...
... Although, because of the extreme visual extinction, none are at the Galactic centre itself, most are within 4o (Majaess et al. 2010, fig. 1). The value of Ro was taken to be the mean distance of the employed set of RR Lyraes, which was determined to be 8.1 0.6 kpc. As the set is large, the stated ...
On the possibility of a helium white dwarf donor in the presumed
... there is a puzzling contradiction between the characteristics (or mere presence) of these bursts and the suggested hydrogen or helium depletion in the donor stars. The bursts detected from these systems last between 10 and a few hundred seconds, suggesting a high hydrogen and helium content in the f ...
... there is a puzzling contradiction between the characteristics (or mere presence) of these bursts and the suggested hydrogen or helium depletion in the donor stars. The bursts detected from these systems last between 10 and a few hundred seconds, suggesting a high hydrogen and helium content in the f ...
W. Ketterle
... of many long-standing goals: (1) to cool neutral atoms into the ground state of the system, thus exerting ultimate control over the motion and position of atoms limited only by Heisenberg’s uncertainty relation; (2) to generate a coherent sample of atoms all occupying the same quantum state (this wa ...
... of many long-standing goals: (1) to cool neutral atoms into the ground state of the system, thus exerting ultimate control over the motion and position of atoms limited only by Heisenberg’s uncertainty relation; (2) to generate a coherent sample of atoms all occupying the same quantum state (this wa ...
Direct Detection of Classically Undetectable Dark
... Spatial extent of the superposition (distance between arms) Exposure time (length of arms, or speed) Elemental composition object Isotopic composition of elements ...
... Spatial extent of the superposition (distance between arms) Exposure time (length of arms, or speed) Elemental composition object Isotopic composition of elements ...
FIELD ASTRONOMY
... The solar day, or the time corresponding to one rotation of the earth with respect to the direction of the sun, is the most natural unit of time for ordinary purposes. If time was regulated by stars, sidereal noon would occur at night during half the year. For obvious reasons, this would not be a sa ...
... The solar day, or the time corresponding to one rotation of the earth with respect to the direction of the sun, is the most natural unit of time for ordinary purposes. If time was regulated by stars, sidereal noon would occur at night during half the year. For obvious reasons, this would not be a sa ...
SIMsim: An End-to-End Simulation of The Space Interferometer
... random walk away from their initial zero value (~800 pm in 5 hours, or ~1.7 nm per day). Delay line metrology measurements also are corrupted with similar errors, plus field-dependent calibration errors are added as well. These result because delay line tracks will not be linear at the picometer lev ...
... random walk away from their initial zero value (~800 pm in 5 hours, or ~1.7 nm per day). Delay line metrology measurements also are corrupted with similar errors, plus field-dependent calibration errors are added as well. These result because delay line tracks will not be linear at the picometer lev ...
Photonic band gap materials: Optical materials for the 21st century
... above requires materials which can scatter light much more strongly than any naturally occurring material. We experience multiple light scattering when it becomes dark on a cloudy day. Light from the sun scatters many times from water droplets, following a tortuous diffusion path before reaching the ...
... above requires materials which can scatter light much more strongly than any naturally occurring material. We experience multiple light scattering when it becomes dark on a cloudy day. Light from the sun scatters many times from water droplets, following a tortuous diffusion path before reaching the ...
The Astronomers of Nabta Playa
... ground and sky would have been self-evident: The three stones within the outer circle are laid out in the precise pattern of the stars of Orion’s famous belt, before summer solstice as indicated by the Calendar Circle itself. Once the pattern becomes familiar it is unmistakable. In another section o ...
... ground and sky would have been self-evident: The three stones within the outer circle are laid out in the precise pattern of the stars of Orion’s famous belt, before summer solstice as indicated by the Calendar Circle itself. Once the pattern becomes familiar it is unmistakable. In another section o ...
Document
... outside the pass band, most interference filters incorporate some absorptive elements as well as dielectric layers ...
... outside the pass band, most interference filters incorporate some absorptive elements as well as dielectric layers ...
Julie Cass - Stanford University
... driving the FEL. While the minimum achievable bunch length at LCLS is known to have a value below 10 fs, the precise value remains unknown. Measurement of this parameter requires a mechanism capable of probing pulses shorter than 10 fs, a scale too small to be resolved by existing time domain detect ...
... driving the FEL. While the minimum achievable bunch length at LCLS is known to have a value below 10 fs, the precise value remains unknown. Measurement of this parameter requires a mechanism capable of probing pulses shorter than 10 fs, a scale too small to be resolved by existing time domain detect ...
Time-resolved detection of propagating Lamb waves in thin
... been demonstrated earlier12 that even for the Rayleigh waves of 100 nm length localized within 100 nm from the surface covered by a similar Al grating, the frequency shift does not exceed 10%. The higher order Lamb modes, guided by the complete thickness of the membrane (324 nm), that are overlappin ...
... been demonstrated earlier12 that even for the Rayleigh waves of 100 nm length localized within 100 nm from the surface covered by a similar Al grating, the frequency shift does not exceed 10%. The higher order Lamb modes, guided by the complete thickness of the membrane (324 nm), that are overlappin ...
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.