78 articole găsite pentru „flow”.
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CHARACTERISTICS OF VOLTAGE MAINTAINING METHODS FOR ELECTRICAL NETWORKS
Prof. Eng. Virgil MAIER PhD, Prof. Eng. Sorin Gh. PAVEL PhD, Assis. Eng. Horia Gh. BELEIU PhD, Eng. Doru LESE PhD Student
Dintre metodele analizate in lucrare fac parte utilizarea de tensiuni suplimentare prin reglajul prizelor la transformatoare si autotransformatoare, modificarea parametrilor retelelor si controlul circulatiei de putere reactiva. In buna parte, aceste metode …
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THE CONCEPT AND THEOR ETICAL STUDY OF MICRO HYDROPOWER PLANT WITH GRAVITATIONAL VORTEX AND TURBINE WITH RAPIDITY STEPS
Eng. Gheorghe-Marius MARIAN, Prof. Eng. Tudor SAJIN PhD, Prof. Eng. Iulian FLORESCU PhD, Eng. Dragos-Iulian NEDELCU PhD, Eng. Constantin-Narcis OSTAHIE PhD, Eng. Catalin BIRSAN PhD
Pentru un nou concept de microhidrocentrala cu vartej gravitaional i turbina in trepte de rapiditate s-a modelat curgerea apei prin canalul conic in lipsa si in prezenta treptelor. In primul caz, liniile de curent au forma unor elice conice. Viteza axiala s…
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PV SYSTEM SIMULATION MODELS DEVELOPED FOR A DISTRIBUTED NETWORK AND VALIDATED BY EXPERIMENTS
Assoc. Prof. Eng. Lucian MIHET-POPA, PhD, Lecturer Eng. Octavian CORNEA PhD, Professor Eng. Voicu GROZA PhD (Canada)
Articolul prezinta modelarea panourilor solare cu ajutorul parametrilor tehnici din catalog si a unui model matematic care are la baza circuitul echivalent al panoului cu o singura dioda. Modelul matematic a fost implementat initial in MATLAB/Simulink iar rez…
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PHASE-SHIFT TRANSFO RMER WITH IMPROVED CHARACTERISTICS
Mihai TIRSU, PhD(Rep.Moldova), Vladimir BERZAN, dr.(Rep.Moldova), Lev CALININ, PhD(Rep. Moldova), Dmitrii ZAITEV PhD (Rep. Moldova)
Transformatoarele de reglare a decalajului de faza (TRDF) sunt componente cruciale in lupta ce se desfasoara pentru imbunatatirea eficientei retelei de curent alternativ si eliminarii congestiilor. Cresterea permanenta a energiei electrice transportate aduce …
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IMPACT EVALUATION OF DIRECT LIGHTNING STRIKE ON A TOWER. GROUND POTENTIAL RISE ALTERNATIVE COMPUTATIONS
Dr. Andrei CECLAN, Prof. Dr. Eng. Vasile TOPA , Assoc. Prof. Dr. Eng. Dan Doru MICU, PhD. Stud. Levente CZUMBIL
Orice structura metalica, in special cele inalte de telecomunicatii, turnuri eoliene sau alt tip de turnuri metalice pot servi ca si canale de descarcare pentru curenti de trasnet de ordinul sutelor de kA si astfel sa conduca la aparitia unor potentiale ele…
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ON THE PHYSIOLOGICAL INFLUENCE OF ELECTROMAGNETIC WAVES CONSIDERING AN ELECTRICAL MODEL OF PULMONARY VENTILATION
PhD. Student Catalina LUCA , Prof. Dr. Eng. Alexandru SALCEANU
Am dezvoltat un model electric al ventilatiei pulmonare in Simulink-Matlab , si am studiat influenta radiatiei electromagnetice asupra functionarii fiziologice a plamanului. In cadrul modelului nostru simulat , am observat ca radiatiile electromagnetice de …
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THE WELDING TECHNOLOGY INFLUENCE ON THE DOUBLE T GIRDER BEAMS BUCKLING
dr. ing. Ioan-Sorin LEOVEANU, Assoc. prof. eng. Eva KORMANÍKOVÁ, PhD (Slovacia), Assis. prof. Eng. Kamila Kotrasová, PhD (Slovacia), Prep. drd. eng. Daniel TAUS
In domeniul ingineriei civile structurile de rezistenta metalice au o deosebita importanta in reducerea greutatii constructiei cu deosebire in cazul constructiilor inalte, a podurilor si a constructiilor cu scop industrial. Pentru a putea micsora cat mai mult…
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SIMULATION AND ANALYSIS OF A FUEL CELL/BATTERY HYBRID VEHICULAR POWER SYSTEM
Alina-Georgiana STAN (BACIU), George Adam, Gheorghe Livint, Claudiu Munteanu
Sistemele hibride cu pile de combustie si baterii prezinta un mare potential pentru imbunatatirea eficientei si a raspunsului dinamic al acestora. In cazul unor astfel de sisteme hibride, se impune utilizarea unei strategii adecvate de management si control…
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STUDIUL RETELELOR DE AERAJ PRIN METODE MODERNE
Dr. ing. Doru CIOCLEA, Dr. ing. Constantin LUPU, D Dr. ing. Ion TOTH, Ing. Ion GHERGHE, Ing. Corneliu BOANTA
Pe parcursul procesului de extragere a carbunilor se degaja cantitati importante de gaze explozive (metan si omologi ai metanului, hidrogen etc.) care in anumite conditii pot conduce la aparitia fenomenului de explozie. Principala masura de prevenire a explo…
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MONITORIZAREA BOLILOR SI DAUNATORILOR LA MAR - VERIGA DE BAZA IN OBTINEREA UNOR FRUCTE DE CALITATE
Prof. dr. Olimpia Alina IORDANESCU, Drd. ing. Roxana Elena MICU
Dintre cele mai cunoscute boli ale marului face parte rapanul (Venturia inaequalis), iar ca daunator se remarca viermele merelor (Cydia pomonella). Impactul acestora asupra fructelor si implicit asupra calitatii acestora este foarte important, intrucat fructe…
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STUDIES REGARDING THE USE OF PHOSPHATE GROUPS-IMPREGNATED RESINS IN VIEW OF METAL IONS REMOVAL FROM SOLUTIONS
Cerc. st. dr. ing. Mihaela CIOPEC, Sef lucr. dr. ing. Cornelia MUNTEAN, Sef lucr. dr. ing. Adina NEGREA, Prof. dr. ing. Petru NEGREA, Prof. dr. ing. Corneliu DAVIDESCU, Asist. dr. ing. Lavinia LUPA
Prezenta ionilor metalelor grele in mediu constituie o preocupare majora datorita toxicitatii lor pentru multe forme de viata. Tratarea apelor reziduale continand ioni de metale grele necesita concentrarea metalelor intr-un volum mai mic urmata de recuperarea…
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On the limits of the Betz’s efficiency coefficient of wind turbines with the horizontally shaft
Prof.dr. ing. Petre Terzi
Pornindu-se de la modelarea curgerii prin elementele rotorului de turbina eoliana cu arbore orizontal, prin aplicarea conceptului de curgere turbulrbulenta neintubata, pe baza publicatiilor lui Betz si Sabinin, se prezinta un nou concept teoretic privind limi…
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CONTROL AND COORDINATION OF ECONOMIC AND INTELLECTUAL ACTIVITIES BY INTEGRATED COMPLEX STRUCTURES
Constantin MARIN
This paper belongs to the category of research for the development and implementation of heterogeneous structures they apply favorable inclusion of the human factor for control and coordination of complex activities from various fields: economic, intellectual…
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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…
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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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THE EXERGY ANALYSIS OF THE INDUSTRIAL SYSTEMS
Ilie SIMINICEANU
This paper deals with the exergy analysis of a nitric acid plant with ammonia oxidation at normal pressure, and chemical absorption at a pressure of 5 bar (1/5 process).The exergy balance model established previously for open chemical systems, and the corresp…
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SUSTAINABLE DEVELOPMENT THROUGH PHOTOVOLTAIC ENERGY
Mihai CRENGANIS, Octavian BOLOGA
Our paper presents general aspects regarding renewable energy and its technologies. We are summarizing the characteristics of the photovoltaic energy. Also the paper describes the main components of a 24 MW photovoltaic project around Sibiu city. The goal of …
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POWER SYSTEM OPERATION IN A CHANGING
ENVIRONMENT
Walter Sattinger (Elvetia)
Currently worldwide all power systems are faced with dramatically changes. After restructuring the system operation due to unbundling and deregulation and related high volatility of power flows at the level of transmission, we can observe substantial change…