Results 21 to 30 of about 368,669 (336)

Varieties of Helmholtz Machine [PDF]

open access: yesNeural Networks, 1996
The Helmholtz machine is a new unsupervised learning architecture that uses top-down connections to build probability density models of input and bottom-up connections to build inverses to those models. The wake-sleep learning algorithm for the machine involves just the purely local delta rule.
Peter Dayan, Geoffrey E. Hinton
openaire   +3 more sources

Sur l’ambition de vulgariser la science (1874)

open access: yesPhilosophia Scientiæ, 2005
We propose a French translation of the preface written by H. nov Helmholtz to the German translation of Fragments of Science by Tyndall. The German translation was by Anna von Helmholtz and Du-Bois Reymond and reviewed by H. von Helmholtz. The numbers in
Hermann von Helmholtz
doaj   +1 more source

INVESTIGATION OF THE MECHANISM OF THE PRESSURE WAVES DISTRIBUTION IN THE INJECTED FLUID FROMTHE WELLHEAD TO THE BOTTOM HOLE

open access: yesИзвестия высших учебных заведений: Нефть и газ, 2017
Based on the analysis of the existing material on pumping liquids with pressure pulses into the borehole we suggest to consider wellhead injection. The processes of the pressure pulse propagation in the pumped liquid by using wellhead pulsers.
M. Ya. Habibullin   +3 more
doaj   +1 more source

Fundamental material properties of the 2LiBH4-MgH2 reactive hydride composite for hydrogen storage: (II) Kinetic properties [PDF]

open access: yes, 2018
Reaction kinetic behaviour and cycling stability of the 2LiBH4-MgH2 reactive hydride composite (Li-RHC) are experimentally determined and analysed as a basis for the design and development of hydrogen storage tanks.
Capurso, Giovanni   +11 more
core   +7 more sources

A New Modified Helmholtz Equation for the Expression of the Gravity Gradient and the Intensity of an Electrostatic Field in Spherical Harmonics

open access: yesMathematics, 2023
In this work, it is shown that the geometry of a gravity field generated by a spheroid with low eccentricity can be described with the help of a newly modified Helmholtz equation.
Gerassimos Manoussakis
doaj   +1 more source

Helmholtz algebraic solitons [PDF]

open access: yes, 2010
We report, to the best of our knowledge, the first exact analytical algebraic solitons of a generalized cubic-quintic Helmholtz equation. This class of governing equation plays a key role in photonics modelling, allowing a full description of the ...
Chamorro-Posada, P   +2 more
core   +2 more sources

A complex variable boundary element-free method for the Helmholtz equation using regularized combined field integral equations

open access: yesApplied Mathematics Letters, 2020
Based on the combined field integral equation (CFIE) and the complex variable moving least squares (CVMLS) approximation, a complex variable boundary element-free method is developed for the exterior Neumann problem for the Helmholtz equation.
Linchong Chen, Xiaolin Li
semanticscholar   +1 more source

Preconditioning harmonic unsteady potential flow calculations [PDF]

open access: yes, 2005
This paper considers finite element discretisations of the Helmholtz equation and its generalisation arising from harmonic acoustics perturbations to a non-uniform steady potential flow.
Giles, M. B., Laird, Alistair L.
core   +2 more sources

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