Results 251 to 260 of about 883,360 (293)
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Operator ordering in effective-mass theory
Physical Review B, 1989We study the problem of operator ordering in the effective-mass Hamiltonian with kinetic energy operator 1/4(${\mathit{m}}^{\mathrm{\ensuremath{\alpha}}}$${\mathit{pm}}^{\mathrm{\ensuremath{\beta}}}$${\mathit{pm}}^{\ensuremath{\gamma}}$+${\mathit{m}}^{\ensuremath{\gamma}}$${\mathit{pm}}^{\mathrm{\ensuremath{\beta}}}$${\mathit{pm}}^{\mathrm{\ensuremath{\
, Thomsen, , Einevoll, , Hemmer
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Magnetically operated mass-arker
Journal of Scientific Instruments, 1960The construction and operation of a magnetically operated mass-recorder which is suitable for use with the mass-spectrometer, type M.S.2 (by Metropolitan-Vickers Electrical Co. Ltd.), is described. Certain precautions in its operation are discussed. On the present evidence it operated with such accuracy as to be useful in a mass-range of up to 500 mass-
J J Brown, R I Reed, W Simpson
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Quantifying the operation of sinusoidal mass filters
Journal of Mass Spectrometry, 2021AbstractEven though sinusoidal quadrupole mass filters have been around for more than 50 years, the relationships defining resolution, resolving power, and transmission from the applied voltages have not been rigorously quantified or discussed. Traditional quadrupole mass filter theory implies that voltages are scanned at constant direct current (DC ...
Adam P. Huntley, Peter T.A. Reilly
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Operative treatment of appendix mass
The American Journal of Surgery, 1976From January 1972 to March 1974, thirty-four consecutive patients with appendix masses underwent acute appendectomy within 32 hours of admission. There was no death and no morbidity, except local wound problems in six patients and drainage of pus from drain site in four patients.
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The Static Operation Mass Spectrometer
Japanese Journal of Applied Physics, 1975A mass spectrometer has been designed for the studies on the adsorption of CO, CO2 and O2 in a closed system. The spectrometer is a 60° sector type of 10 cm in radius, and made of Pyrex glass. The electrodes are made of gold and silver, and a tin-oxide coating is adopted as the conductive coating. The field emission cathode operated at room temperature
Mitsuhiro Irako +2 more
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2010
Distillation is the process in which the separation of components in a mixture is achieved due to differences in volatility, that is differences in vapour pressure, of the components in the mixture to be separated. The simplest kind of batch distillation process results in only a limited increase in the concentration of the more volatile component (MVC)
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Distillation is the process in which the separation of components in a mixture is achieved due to differences in volatility, that is differences in vapour pressure, of the components in the mixture to be separated. The simplest kind of batch distillation process results in only a limited increase in the concentration of the more volatile component (MVC)
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Mass-selective operation with REXTRAP
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2011Abstract At the radioactive ion-beam facility REX-ISOLDE more than 60 different types of radionuclide ions have been post-accelerated to energies up to 3.15 MeV/u within the last years. The transmission efficiency of the system has continually increased with gained operation experience. Apart from striving for the highest possible intensity, the beam
A. Gustafsson, A. Herlert, F. Wenander
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Management of adnexal masses by operative laparoscopy
The Journal of the American Association of Gynecologic Laparoscopists, 1995To assess the efficacy of operative laparoscopy to confirm the diagnosis of benign adnexal masses, and treat the lesions.Consecutive patients evaluated for this indication between January 1989 and December 1993, who met the inclusion criteria.The Jan Palfijn General Hospital, Antwerp, Belgium, and the Department of Obstetrics and Gynecology, University
Van Herendael B +5 more
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Operational research into mass production
European Journal of Operational Research, 1983Abstract A review of OR/Management Science research into systems for the mass production of discrete items reveals that the main strands of interest have remained remarkably constant. However, there has been relatively little published work depicting applications, and this paper seeks to explain why, whilst discussing the contribution that has been ...
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