194 articole găsite pentru „materials”.
-
NEW RESEARCH ON COMPOSITE MATERIALS AT THE METAL FORMING RESEARCH CENTRE
Claudia GÎRJOB, Octavian BOLOGA, Gabriel RACZ, Cristina BIRIS
The Metal Forming Research Centre functions as separate research unit within "Lucian Blaga" University of Sibiu, Romania. This is one of the first centres of its kind in Romanian higher education system and emerged under the aegis of the European inter-univer…
-
A SOCIO-ECONOMIC REGULARITY ESTABLISHED BASED ON AN ANALOGY WITH THERMODYNAMIC PROCESSES WITH FINITE SPEED - An Equation for Standard of Living -
Ioan GANEA, Adrian S. PETRESCU, Liliana TIMOFAN , Stoian PETRESCU, Monica COSTEA
This paper proposes a quantitative description of the flows of energy, mass and information in a country, based on recently developed concepts in Thermodynamics with Finite Speed. An equation for Standard of Living is derived. As shown in the ‘70 by Georgescu…
-
STUDY REGARDING THE USE OF NEW SUSTAINABLE TEXTILE MATERIALS
Dorin VLAD, Alina Mihaela COLDEA, Diana COMAN
This paper presents a new eco-efficient way about using textile materials in order to minimize potential environmental impacts and human health. It also shows the advantages and the limitation of these materials. Because conventional textile production is one…
-
CURRENT RESEARCH DIRECTIONS IN BUILDING PHYSICS IMPROVING PERFORMANCE LEVELS FOR NEW OR RENOVATED BUILDINGS
Adrian RADU, Maricica VASILACHE, Marian PRUTEANU
In the present climatic, social and political conditions, the EU energy independence is emerging as a priority. Therefore, it set new levels of thermal protection minimum required and adapting buildings architecturally to achieve a maximum of energy efficienc…
-
INCREASING SUSTAINABILITY OF THE HOUSING STOCK BY AVOIDING DAMAGE CAUSED BY THE SOIL-STRUCTURE RESONANCE
Dinu BRATOSIN
In any dynamic system, the coincidence between natural period and excitation period (the resonance) lead to extremely large dynamic amplification. For example a linear system with damping of order 25% the dynamic amplification factor has values between d…
-
MAGNETIC CHARACTERISTICS OF NON-ORIENTED SILICON IRON STRIPS OBTAINED THROUGH MECHANICAL, LASER, ELECTRICAL DISCHARGE AND WATER JET CUTTING TECHNOLOGIES
Horia GAVRILĂ, Veronica MĂNESCU (PĂLTÂNEA), Gheorghe PĂLTÂNEA, Gheorghe SCUTARU, Ioan PETER
The increase of the asynchronous motors efficiency may be usually made by decreasing the total energy losses in the magnetic circuits. Non-oriented silicon iron (NO Fe-Si) sheets are soft magnetic materials with a nearly isotropic grain texture. They are used…
-
THEORETICAL CONSIDERATIONS ON THE MICROMECHANICS COMPOSITE MATERIALS
Constantin D. STǍNESCU, Doina TǍRǍBUŢǍ (ENE),Mariana PǍTRAŞCU (ANTONESCU, Melania TĂMAȘ
the efficiency of a composite material is distinguished by the top level of the technical characteristics and its properties. For their study, it appeals to a number of considerations, such as: minimum dimensions of the primary elements of reinforcement secti…
-
THEORETICAL RESEARCH ON THE MODELING OF CHARACTERISTICS OF COMPOSITE MATERIALS
Constantin D. STǍNESCU, Doina TǍRǍBUŢǍ (ENE),Mariana PǍTRAŞCU (ANTONESCU), Melania TĂMAȘ
the two components of the composite material, i.e., the matrix and the wire, take the requests differently compared with their rigidity. The way the force applied is taken over by composite components and their structural deformities depend on the connection …
-
DETERMINATION OF THE OPTIMAL MATERIAL FOR PERMANENT MAGNETS USED IN THE MANUFACTURE OF HIGHPOWER AUDIO DEVICES
Constantin D. STĂNESCU, Liliana CĂINICEANU
Crowded permanent magnets of NdFeB -type have the superior properties to those intered as shown by the magnetic circuit modeling using finite element method (FEM). Determination of the optimum material for magnetic circuit of high power audio devices is a com…
-
NEW APPROACHES ON THE ENERGY STORAGE TECHNOLGIES IN ROMANIA
Ioan ȘTEFĂNESCU, Mihai VARLAM, Elena CARCADEA
Critical issues related to the availability of energy sources and their efficient use has quickly become vitally important. Population growth combined with growing demand for energy and materials in order to increase the standard of living is actually the mai…
-
CENTRUL DE COMPETENŢĂ PENTRU TEHNOLOGII SPAŢIALE DIN CONSTANŢA DEDICAT DEZVOLTĂRII SUSTENABILE A REGIUNILOR MARINE ȘI COSTIERE ROMÂNEȘTI – COSMOMAR
Răzvan MATEESCU, Simion NICOLAEV, Luminița BUGA, Gabriel GANEA,Eden MAMUT, Claudiu FERCU, Laurențiu OANCEA
Marea Neagră este bazinul terminal al unei treimi din reţeaua hidrografică a Europei (de cinci ori mai mult decât suprafaţa sa). Dintre toate bazinele oceanului planetar, degradarea mediului în bazinul Mării Negre este cea mai severă. Monitorizarea stării tro…
-
CARACTERISTICI MECANICE ALE MATERIALELOR COMPOZITE IN DOMENIUL AERONAUTIC
Dr. ing. Dorin ROSU, Ing. Traian TOMESCU, Ing. Tudor TOMESCU (Germania)
Lucrarea prezinta aspecte teoretice si rezultate originale ale incercarilor unor materiale compozite, realizate la Brasov. Datorita proprietatilor inalte mecanice ale compozitelor pe baza de fibre de carbon cu rasini epoxidice, acestea au capatat aplicatii …
-
Materials used in couplings mechanical friction braking system of high speed railway vehicles
Luisa Izabel Dungan, Mircea Adrian Dungan
Lucrarea prezinta un studiu cu privire la materialele utilizate pentru anumite componente ale cuplului de frecare: sabot pe bandajul rotii si garnitura de frecare pe discul de frnare. Elementele cuplei de frecare prin materialele din care sunt confectionate, …
-
Characteristics of laser beam used in materials processing
Ramona Laslau, Richard Herman, Remus Boboescu
Laserii industriali cu Nd:YAG si CO2 este sunt folositi la prelucrarea materialelor. Calitatile fasciculului laser determina utilizarea acestuia ca sursa termica. Se prezinta principalele proprietati ale fasciculului laser. Se prezinta marimile care caracter…