نتایج جستجو برای: gas radiation
تعداد نتایج: 475403 فیلتر نتایج به سال:
The information rates achievable with a photon-gas model of electromagnetic radiation are studied. At any frequency, information rates over the photon-gas model essentially coincide with the Shannon capacity when the signal-to-noise ratio is below a threshold. Only above the threshold does the photon gas incur in a significant loss in information rates; the loss can amount to half of the capaci...
Detailed modeling of an experimental ethylene/air jet flame is undertaken using the composition PDF method for gas-phase kinetics coupled with detailed models for soot formation and radiation from the flames. The gas-phase kinetics is modeled using a reduced mechanism for ethylene consisting of 33 species and 205 elementary reactions. The soot formation is modeled using the method of moments wi...
We report here on the coupling of a gas reactor with a VUV beamline at the SOLEIL synchrotron radiation facility. The reactor may be irradiated window-less with gas pressure up to the atmosphere. The photochemistry is monitored by a mass spectrometer gas analyzer. This set up, termed APSIS for Atmospheric Photochemistry SImulated by Synchrotron, has been used to simulate the atmosphere of Titan...
The distributions of L([O iii]λ5007), black hole (BH) mass and L/LEdd in two large samples of type-I and type-II active galactic nuclei (AGNs) are compared in order to test the suggestion that radiation pressure force is affecting the gas velocity in the broad line region and hence the BH mass determination. The samples are drawn from the SDSS archive and are modified to represent the same pare...
The current generation of millimeter interferometers have revealed a population of compact (r ∼< 0.1 pc), massive (M ∼ 100 M⊙) gas cores that are the likely progenitors of massive stars. I review models for the evolution of these objects from the observed massive core phase through collapse and into massive star formation, with particular attention to the least wellunderstood aspects of the pro...
We present results of numerical simulations carried out with a 2D radiation hydrodynamics code in order to study the impact of massive stars on their surrounding interstellar medium. This first paper deals with the evolution of the circumstellar gas around an isolated 60M⊙ star. The interaction of the photoionized H ii region with the stellar wind bubble forms a variety of interesting structure...
One of the key components of a chemical gas sensor is a MEMS micro-heater. Micro-heaters are used in both semiconductor gas sensors and NDIR gas sensors; however they each require different heat dissipation characteristics. For the semiconductor gas sensors, a uniform temperature is required over a wide area of the heater. On the other hand, for the NDIR gas sensor, the micro-heater needs high ...
Zero-degree calorimeters have limited space and extreme levels of radiation. A simple, low cost, radiation hard design uses tungsten metal as the absorber and a suitable liquid as the Čerenkov radiator. In other applications a PPAC (Parallel Plate Avalanche Counter) operating with a suitable atmosphericpressure gas is an attractive active material for a calorimeter. It can be made radiation har...
We present the results of a proof-of-principle experiment to demonstrate the generation of tunable radiation from a laser-ionized gas-filled capacitor array. This scheme directly converts a static electric field of wave number k0 into coherent radiation pulses of frequency v2 py2k0c, where vp is the plasma frequency. The radiation frequency can be tuned by varying gas pressure and/or capacitor ...
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