1,721,353 research outputs found
Visual characteristics including lift-off, of the jet flames in a cross-flow high-temperature burner
No full textSince flame modes, lift-off and stability are of much practical importance in the design of burners, these characteristics of the jet flames in a cross-flow at normal temperatures have been studied. Regarding general characteristics at high temperature, however, little research has been reported, even though many practical burners utilize the benefits of high temperature. This study investigates the general characteristics of the jet flames in a cross-flow at high temperature. The characteristic flame modes observed Lire found to be fundamentally different from those at normal temperature, and the lift-off behaviour could be understood through the premixed concept, including the effects of the large structure. Jet flames in a cross-flow behave differently from those at normal temperature, and the distinct characteristics should be considered in the design of each burner. (C) 2003 Published by Elsevier Ltd
rain metastases from early stage endometrial carcinoma 8 years after primary treatment: case report and review of the literature.
No full textDC CONDUCTANCE OF CUPC FILMS PREPARED BY PLASMA ACTIVATED EVAPORATION
No full textA CuPc film with good mechanical and gas sensing properties was prepared by the plasma activated evaporation method. The conductivity of the CuPc film approximately satisfies the following equation: sigma = sigma (o) exp(-E/kT) where E is the activation energy. The activation energies of the films deposited at high pressures (200 and 300mtorr) are 0.7 similar to 0.8eV which are almost the same with Eg/2 of the sublimated CuPc film. For the films deposited at low pressures (20 and 100mtorr), the activation energies are 0.1 similar to 0.4 eV depending on the gas environment. As the deposition pressure of the CuPc film decreases, the porosity of the film increases and thus the surface area where NOx gas molecules can be adsorbed increases. This results in the increases of the DC conductivity and the NOx gas sensing sensitivity with decreasing CuPc deposition pressure
Metallodielectric nanopatch cavity with extended metal shields
No full textWe report that the radial extension of parallel metal plates can significantly suppress the radiation losses from the cylindrical metallodielectric nanopatch cavities. The improved quality factor can be obtained analytically, and therefore systematically optimized
Fiber-optic sensor array based on Sagnac interferometer with stable phase bias
No full textWe propose and experimentally demonstrate a novel fiber sensor array based on Sagnac interferometer with very simple electronic signal processing. A stable quadrature phase bias was obtained using a phase modulator, and polarization-induced signal fading was suppressed by using a depolarizer and a broad-band source, Phase sensitivity of about 4.0 mu rad(rms)/root Hz at 5 kHz was obtained using a two-sensor array
Efficient formulation of Raman amplifier propagation equations with average power analysis
No full textFor the first time, we derive efficient modeling equations for the average power analysis of Raman amplifiers (RAs) from the standard propagation equations. Applications of these equations to the numerical analysis of practical RA-based systems show a reduction in computation time of over two orders of magnitude compared with the direct integration approach based on ordinary coupled differential equations, while reproducing all the essential system performances precisely. In addition to enhanced computational efficiency, derived equations also give deeper insights into the detailed dynamics of RAs
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