Results 121 to 130 of about 5,741,583 (149)

Gate-Controlled dv/dt- and di/dt-Limitation in High Power IGBT Converters

EPE Journal, 1996
AbstractA central issue in reducing the size and cost of IGBT power converters is to control or limit dv/dt and di/dt during the switching process. Load side snubbers and clamp circuits are bulky and expensive. Increasing the gate resistors values is cheap and simple but switching times as well as power losses are increased.In this article the authors ...
Christian Gerster, Patrick Hofer
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The Prediction ofd-dSpectra

Comments on Inorganic Chemistry, 1996
Abstract It is now possible to compute the complete spectral trace for ‘d-d’ transitions. Plans for exploiting this within a new teaching and research facility are illustrated. The models upon which the calculations rest are described for the non-specialist researcher.
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Kinetics of muonic helium in muon-catalyzedd-dandd-tfusion

Physical Review Letters, 1987
An accurate kinetics treatment is applied to the muonic helium atoms formed by a muon's sticking to the charged particle produced in muon-catalyzed d-d and d-t fusion. Cross sections for l- and n- changing transitions are included to describe density-dependent stripping and x-ray production.
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On PIC(D[α]) For a Principal Ideal Domain D

Canadian Mathematical Bulletin, 1989
AbstractLet D be a PID with infinitely many maximal ideals. J. W. Brewer has asked whether some simple ring extension D[α] of D must have nontrivial Picard group. We show that this question has a negative answer.
Gilmer, Robert, Heinzer, William
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Studies on borate esters III. Borate esters of D‐mannitol, D‐glucitol, D‐fructose and D‐glucose in water

Recueil des Travaux Chimiques des Pays-Bas, 1985
AbstractA combination of 11B and 13C NMR spectroscopy with several model compounds has been used to elucidate the nature of the ester formation between borate and D‐mannitol, D‐glucitol, D‐fructose and D‐glucose in aqueous solution at pH 6‐12 and at 25 °C. At high carbohydrate/borate ratios, D‐mannitol shows the selective formation of bis(D‐mannitol) 3,
M. Makkee, A. P. G. Kieboom, H. van Bekkum   +2 more
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Symmetries of type D+D− gravitational instantons

Journal of Mathematical Physics, 1994
Gravitational instantons are considered important in analyzing such quantum gravitational effects as the evaporation and condensation of black holes and the stability of the vacuum at finite temperature. Unfortunately, not every positive definite solution of the field equations is derivable from the Lorentzian regime by analytic continuation.
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Search for SmAd–SmAd′ transitions

The Journal of Chemical Physics, 1993
High-resolution heat capacity measurements have been made on two mixtures of 4-nonyloxybenzoyloxy-4′-cyanoazobenzene (9OBCAB) and 4-nitrophenyl-4′-(4″-n-hexyloxybenzoyloxybenzoate) (6ONPBB). The goal of this work was to establish the thermal behavior near a proposed SmAd–SmAd′ transition between two different partial bilayer smectic-A phases.
Lei Wu, C. W. Garland, R. Shashidhar
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Packing d-Dimensional Bins in d Stages

Mathematics of Operations Research, 2008
We consider the d-dimensional bin-packing problem, the most relevant generalization of classical bin packing, and show a general result about the asymptotic worst-case ratio of a wide class of approximation algorithms that construct solutions in d stages, containing many heuristics previously considered in the literature.
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I. Account of William Lothian, D. D.

Transactions of the Royal Society of Edinburgh
The custom adopted by several learned Societies or Acadedemies abroad, which requires, that a professed panegyric on every one of the Members, after his death, should first be read before the Academy, and then printed in the history of their transactions, has not met with a general approbation, either in England or in this country.
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D grad ν or grad(Dν)?

Journal of Applied Physics, 1984
An introduction to the problem in the title of the paper is attempted, D being a diffusion constant for particles of concentration ν. A general formalism and some special results are outlined which seek to show that, provided one proceeds in an appropriate and consistent manner, either formulation is permissible.
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