1.014 articole găsite pentru „MAT”.
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Timpul si dozarea efortului prin utilizarea soft-urilor profesionale, in formarea si activitatea tehnicienilor
Drd. ing. inf. Dorin Scanteie
Lucrarea de fata se vrea o pledoarie pro domo in favoarea utilizarii cu discernamint a tehnologiilor din domeniul informatic (IT). Lucrarea prezinta doua metode, pentru rezolvarea unor probleme simple si a unor probleme complexe cu efecte notabile asupra timp…
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Proiectarea si realizarea rapida a calapodului pentru incaltaminte cu ajutorul tehnologiei CAD/CAM
Conf. dr. ing. Aura Mihai, Mariana Pastina, Marta-Catalina Harnagea
In cadrul acestei lucrari se prezinta modul de obtinere a unui produs special adaptat unui consumator, plecindu-se de la cerintele morfo-functionale sau structurale ale piciorului. Trecerea de la dimensiunile piciorului la dimensiunile calapodului presupune o…
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New technologies of precise electrometry
Prof. dr. ing. Michael N. Surdu (Ucraina)
Noua abordare a problemei de crestere a preciziei de masurare a cantitatilor electrice este descrisa. Aceasta abordare se bazeaza pe variatiile de influenta a surselor de incertitudine la rezultatul masurarii. De obicei modelul matematic descrie rezultatul m…
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THE USE OF THE RADIOFREQUENCY FIELD IN MÖSSBAUER MEASUREMENTS
Ph. D. Dipl.Eng. Ion Bibicu
Aplicarea campurilor de radiofrecventa asupra materialelor feromagnetice induce efecte interesante asupra proprietăţilor acestor materiale. Una din metodele de studiu a ac estor efecte este spectroscopia Mossbauer. A fost realizată o instalaţie pentru aplicar…
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CONSIDERAȚII PRIVIND INSERȚIA PERSOANELOR CU DIZABILITĂȚI ȘI AVÂND O PREGĂTIRE INGINEREASCĂ SUPERIOARĂ, ÎN UNITĂȚI PROTEJATE AUTORIZATE DIN ROMÂNIA ÎN ANUL 2022
Dr. ing. Adrian PETRU
Lucrarea prezintă un studiu asupra informațiilor publicate de Autoritatea Națională pentru Protecția Drepturilor Persoanelor cu Dizabilități despre Unitățile Protejate Autorizate și integrarea profesională a persoanelor cu dizabilități, în special a celor cu …
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STABILIREA PARAMETRILOR SPECIFICI MĂSURĂRII ARMONICE A ELEMENTELOR GEOMETRICE ALE ANGRENAJELOR EVOLVENTICE PRIN SIMULARE NUMERICĂ
Drd. ing. Dănuț Iulian STANCIU, Dr. ing. prof. univ. Gh. GHEORGHE, Dr. ing. Daniela CIOBOATA
Măsurarea armonică a parametrilor geometrici a angrenajelor cu profil evolventic este o metodă mult mai rapidă decât metodele tradiţionale de verificare, cu o precizie suficient de mare să poată fi aplicată cu succes în industria producătoare de roţi dinţate …
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PREDICTIVE MAINTENANCE APPLIED TO LASTING EQUIPMENT
Velicu ŞTEFAN, Ionel PĂUNESCU, Marius PARASCHIV, Paul Liviu PĂUNESCU
This paper highlights the research conducted for proactive maintenance application by analyzing vibration and temperature monitoring during equipment operation, a method that provides a beneficial way clear, comprehensive and thorough to maintain normal opera…
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COMPUTING SYSTEMS MULTI-OBJECTIVE OPTIMIZATION USING DOMAIN-KNOWLEDGE
Lucian N. VINȚAN
The main aim of this short paper is to point out the advanced computing systems’ optimization research developed by The Advanced Computer Architecture and Processing Systems Research Centre (ACAPS) from “Lucian Blaga” University of Sibiu, Romania. Multi-objec…
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MEANS FOR QUALITATIVE AND QUANTITATIVE DESCRIPTION OF THE CARDIO-PULMONARY SYSTEM OPERATION WITHIN IRREVERSIBLE THERMODYNAMICS WITH FINITE SPEED
Stoian PETRESCU, Monica COSTEA, Liliana TIMOFAN, Valeria PETRESCU
Illness and aging are irreversible processes, which inevitably affects us all. The answers to the questions how, why, and how much irreversible are the cardio-respiratory system processes, will allow improved design of artificial hearts and lungs (vital “spar…
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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…
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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…
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ANALIZA COMPORTĂRII DINAMICE A DISPOZITIVELOR ANTISEISMICE SCHEMATIZATE CA MODELE REOLOGICE COMPLEXE
Polidor BRATU
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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…
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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…
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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 …
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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…
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MÖSSBAUER EFFECT INVESTIGATION OF FE-C STEEL ELECTROLYTIC GALVANISATION
Ion BIBICU, Caius BULEA, Vasile RUS
Galvanizing is a very well known industrial process for anticorrosive and protection coatings. At first sight, galvanizing should not need any further important research and development involvement but many reasons contradict this appreciation: the constant e…
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NEARLY ZERO ENERGY BUILDING CONCEPT, ENERGY DESIGN PARADIGM FOR NEW BUILDINGS AND FOR RENOVATING EXISTING BUILDINGS
Dan CONSTANTINESCU, Gabriela CARACAŞ
The paper focuses on the new concept of Nearly Zero Energy Building – NZEB, which should lead, in time, to reducing the fossil energy consumption and to the protection of the natural and built environment. The NZEB concept, as defined by the European Directiv…
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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…
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ARE THE STATIC POWER CONVERTERS
ENERGY EFFICIENT?
Ion POTÂRNICHE, Cornelia POPESCU, Mina GHEAMALINGA
The power static converters, products used intensively in industrial applications of type as energy conversion, traction, equipment and lifting equipment structure and others, are characterized through two validates abilities in the industrial practice: utili…