Results 231 to 240 of about 27,357,740 (266)

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
openaire   +1 more source

Synthese der 3‐β‐d‐Galaktosido‐d‐glucose und der 3‐β‐d‐Galaktosido‐d‐fructose

Chemische Berichte, 1954
Abstract1.2.,5.6‐Diisopropyliden‐d‐glucofuranose bzw. 1.2,4.5‐Diisopropyliden‐d‐fructopyranose geben mit Acetobromgalaktose nach Koenigs‐Knorr in 3‐Stellung verknüpfte Disaccharid‐Derivate. Nach Abspaltung der Acetonreste und Acetylgruppen konnte chromatographisch krist. 3‐β‐d‐Galaktosido‐d‐glucose sowie krist.
Richard Kuhn, Hans Helmut Baer
openaire   +1 more source

2 ‐ Desoxy ‐ d‐ xylose aus d‐Glucose über 3‐Desoxy‐d‐galaktose

Chemische Berichte, 1952
Abstract1.2; 5.6‐Diisopropyliden‐3‐tosyl‐d‐glucose läßt sich über 1.2; 5.6‐Diisopropyliden‐3‐desoxy‐glucoseen‐(3), 1.2; 5.6‐Diisopropyliden‐3‐desoxy‐d‐galaktose, 3‐Desoxy‐d‐galaktose und 3‐Desoxy‐d‐galaktoseoxim in 2‐Desoxy‐d‐xylose überführen. Der Abbau des Oxims wurde mit 4‐Fluor‐1.3‐dinitro‐benzol vorgenommen.
Friedrich Weygand, Hans Wolz
openaire   +1 more source

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
openaire   +1 more source

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.
openaire   +1 more source

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.
openaire   +2 more sources

Sur la fonction (dⁿ/dtⁿ) ψ (r) = f(dr/dt, d²r/dt²,…,dⁿr/dtⁿ)

Astronomische Nachrichten, 1976
AbstractThe modern means of computation require mathematical relations in forms which take care of the data directly furnished to the computer by observational instruments. In this communication the general relation of the nth derivative of the function (R) is given.
openaire   +1 more source

Picryl derivatives of benzo[1,2‐d:4,5‐d′]bistriazole and benzo[1,2‐d:4,5‐d′]bistriazole‐4,8‐dione

Journal of Heterocyclic Chemistry, 1975
AbstractIn a previous communication from this laboratory it was reported that benzotriazole reacts with both picryl chloride and picryl fluoride to give 1‐picrylbenzotriazole exclusive of any 2‐picrylbenzotriazole (3). As an extension of this study we have examined the reactions of benzo[1,2‐d:4,5‐d′]bistriazole (I) and benzo[1,2‐d:4,5‐d′]bistriazole‐4,
Jane K. Berlin, Michael D. Coburn
openaire   +1 more source

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.
openaire   +2 more sources

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.
openaire   +1 more source