Search results for "Linear density"

showing 3 items of 3 documents

Laser-induced collective excitations in a two-component Fermi gas

2002

We consider the linear density response of a two-component (superfluid) Fermi gas of atoms when the perturbation is caused by laser light. We show that various types of laser excitation schemes can be transformed into linear density perturbations, however, a Bragg spectroscopy scheme is needed for transferring energy and momentum into a collective mode. This makes other types of laser probing schemes insensitive for collective excitations and therefore well suited for the detection of the superfluid order parameter. We show that for the special case when laser light is coupled between the two components of the Fermi gas, density response is always absent in a homogeneous system.

Condensed Matter::Quantum GasesPhysicsLinear densityCondensed Matter - Mesoscale and Nanoscale PhysicsCondensed Matter - SuperconductivityFOS: Physical sciencesEnergy–momentum relationLaserAtomic and Molecular Physics and Opticslaw.inventionSuperconductivity (cond-mat.supr-con)SuperfluiditylawMesoscale and Nanoscale Physics (cond-mat.mes-hall)QuasiparticleAtomic physicsFermi gasSpectroscopyExcitationPhysical Review A
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Research Regarding the Influence of Raw Material and Woven Fabric Geometry on the Air Permeability of Mattress

2017

Abstract Properties of woven fabrics are influenced by many factors: the nature of raw materials, woven fabric geometry and density, technological parameters of the weaving operation and finishing. The main purpose of this research paper is to increase the performance of woven process during mattress manufacturing by choosing the right woven fabric geometry and raw material. The variation in air permeability depends on the area density, linear density, loop length and thickness of yarns. To obtain woven fabric samples were used several types of classic yarns, also ecological yarns like organic cotton and bamboo viscose. On the other side, tests results show the fabric resistance regarding a…

Linear densityMaterials scienceTextilebusiness.industry010401 analytical chemistryGeometry02 engineering and technologyGeneral MedicineRaw material021001 nanoscience & nanotechnology01 natural sciences0104 chemical sciencesAir permeability specific surfaceWoven fabricViscoseArea densityComposite material0210 nano-technologybusinessWeavingProcedia Engineering
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Evaluation of thin film adhesion to a compliant substrate by the analysis of progressive buckling in the fragmentation test

2009

The interface toughness of a thin coating/compliant substrate system is estimated based on the evolution of coating buckle patterns in the fragmentation test. The linear density of coating buckles as a function of applied strain is determined experimentally for a SiOx coating deposited on a polyethylene terephthalate film. A three-dimensional non-linear finite element model is developed to simulate the process of buckle formation in a single narrow coating strip. The elastic energy released during buckling-driven delamination is obtained from the energy balance in the system before and after the buckling event. Both the interface adhesion and the total energy release rate, which includes th…

Linear densityToughnessMaterials scienceMetals and AlloysElastic energySurfaces and Interfacesengineering.materialSurfaces Coatings and FilmsElectronic Optical and Magnetic Materialschemistry.chemical_compoundCoatingchemistryBucklingMaterials ChemistryengineeringPolyethylene terephthalateThin filmComposite materialBuckleThin Solid Films
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