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Mechanism of electrical breakdown of gases for pressures from 10(-9) to 1 bar and inter-electrode gaps from 0.1 to 0.5mm
(IOP Publishing Ltd, Bristol, 2007)
This paper discusses the mechanisms of gas breakdown at low values of pressure and inter-electrode gap, i.e. in the vicinity of the Paschen minimum. In this area of pressure and inter-electrode gap values, breakdown occurs ...
The validity of the similarity law for the electrical breakdown of SF6 gas
(Ieee-Inst Electrical Electronics Engineers Inc, Piscataway, 2007)
The aim of this paper is to investigate the justification and the limitation of the geometrical similarity law application on the electrical breakdown of SF6 gas. For this purpose, the measurements of the dielectric breakdown ...
Micromechanical analysis of constraint effect on fracture initiation in strength mismatched welded joints
(Trans Tech Publications Ltd, 2007)
In this paper the micromechanical approach to ductile fracture was applied in a study of constraint effect on crack growth initiation in mismatched welded joints. The single-edged notched bend specimens (precrack length a ...
Crack tip strain on ship and in situ measurement in shipyards
(IFAC Secretariat, 2007)
The paper presents the application extent of procedures for measurement deformations on ships. The actual deformation distribution was measured on the surface of the specimen by the optical grating method (OGM) parallel ...
Numerical and analytical modeling of elastic-plastic fracture mechanics parameters
(Trans Tech Publications Ltd, 2007)
Structural integrity and service reliability depend on the fracture resistance of a material. Cracks in the material are the locations of stress concentration, and elastic-plastic deformation can occur causing the development ...
Analiza senzitivnosti sopstvenih vrednosti u dinamici konstrukcija / Eigenvalue sensitivity analysis in structural dynamics
(Univerzitet u Beogradu - Mašinski fakultet, Beograd, 2007)
Modifikacija dinamičkih karakteristika konstrukcija se definiše kao skup metoda kojima se može poboljšati dinamičko ponašanje konstrukcije u eksploataciji. Modifikacija dinamičkih karakteristika ili reanaliza se posebno ...
Approximation of material behaviour of PLLA polymer in HAp/PLLA biocomposite material using nanoindentation and finite element method
(Savez inženjera metalurgije Srbije, Beograd, 2007)
In this work, a combination of nanoindentation experiment and finite element modeling is proposed in order to obtain approximate material behavior of PLLA polymer in hydroxyapatite (HAp)/poly-L-lactide (PLLA) composite. ...
Jedan pristup optimizaciji tankozidih konzolnih nosača otvorenih poprečnih preseka / An approach to the optimization of thin-walled cantilever open section beams
(Srpsko društvo za mehaniku, Beograd, 2007)
U ovom radu je razmatran jedan pristup optimizaciji tankozidih konzolnih konstrukcionih elemenata otvorenih poprečnih preseka izloženih savijanju i ograničenoj torziji. Problem je redukovan na određivanje minimalne mase ...
Pretovarni mostovi sa elevatorima, deo II - konstrukciono rešenje, tehnologija i proračun rekonstruisane strukture / Unloading bridges with reclaimers, Part II: Structural solution, technology and calculus of structural reengineering
(Savez inženjera i tehničara Srbije, Beograd, 2007)
Četiri pretovarna mosta raspona 50 m, kapaciteta 300 t/h opslužuju otvoreno skladište uglja u TE "Kolubara" - Veliki Crljeni. Tokom njihove eksploatacije dolazilo je do relativno čestih zastoja izazvanih nedostatcima noseće ...
Data and modeling of negative ion transport in gases of interest for production of integrated circuits and nanotechnologies
(Elsevier, Amsterdam, 2007)
We review techniques to prepare, evaluate and apply sets of cross section and transport data for negative ions that are required for the modeling of collisional non-equilibrium plasmas used for processing of microelectronic ...