Sökresultat

Filtyp

Din sökning på "*" gav 529814 sökträffar

Direct oil cooling of traction motors in hybrid drives

This paper presents comparisons of utilizing direct oil cooling approaches and conventional indirect cooling approaches for electrical motors which are mounted in HEVs or ZEVs. Both finite volume Computational Fluid Dynamic (CFD) model by FLUENT and finite element electromagnetic model by JMAG are applied to make the simulation accurate and comprehensive. Average temperature over the stator back,

Multiple scattering by a collection of randomly located obstacles Part II: Numerical implementation - coherent fields

A numerical implementation of a rigorous theory to analyze scattering by randomly located obstacles is presented. In general, the obstacles can be of quite arbitrary shape, but, in this first implementation, the obstacles are dielectric spheres. The coherent part of the reflected and transmitted intensity at normal incidence is treated. Excellent agreement with numerical results found in the liter

Impact of Fuel Properties on Partially Premixed Combustion

Compression ignited engines generally have higher efficiency than spark ignition engines. However, the most common combustion concept in compression ignited engines, conventional diesel combustion, struggles with high levels of particulate matter and NOx emissions. Therefore, new combustion strategies are used in compression ignited engines to reduce engine-out particulate matter and NOx emissions

Arkitekten och brukarmedverkan

Working conditions and regulations encourage everyone to participate actively in shaping the surrounding environment in order to increase the social durability. End-users’ participation during the construction process will contribute to building better products that fulfil their needs and requirements. Meanwhile the real estate administrators will achieve a long term economic success if all renter

A 24-GHz 90-nm CMOS beamforming receiver front-end with analog baseband phase rotation

A 24 GHz 2-path beamforming receiver front-end in 90 nm CMOS is presented. It consists of two direct conversion front-ends followed by a baseband block performing phase rotation and signal combination. The baseband phase rotation is performed by combining the quadrature phases using digitally controlled weights, achieving a phase resolution of 11 degrees. From each of the two inputs the front-end

Curiosities extracted from the optical theorem, causality, and reciprocity

The time-domain version of the optical theorem is discussed. The theorem relates the sum of the scattered and absorbed energies, for a plane pulse that is scattered from a bounded obstacle, to the far-field amplitude in the forward direction. Several fundamental results concerning the scattered and absorbed energies that follow from the theorem are discussed.