75 articole găsite pentru „wind”.
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INTERRELATIA DINTRE FACTORII DE MEDIU
SI TROMBOEMBOLISMUL PULMONAR -
REALITATE SAU MIT?
Rodica AVRAM, Ioana IONEL, Mihai BALINT, Florina PARV, Mariana TUDORAN, Tudor CIOCARLIE, Victor MOGA, Iulian AVRAM, Ioana COTET
Relatia intre antecedentele tromboembolice pulmonare si anotimp, clima este controversata si adesea negata. Observatia clinica sugereaza insa o incidenta crescuta a acestora in anumite perioade ale anului in zona noastra geografica. Ne-am propus cercetarea …
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CONTROL OF A 6/4 SWITCHED RELUCTANCE GENERATOR, USING TWO DIFFERENT VOLTAGE SOURCES
Eng. Nicolae-Daniel IRIMIA, PhD, Prof. Univ. Doc. Eng. Alecsandru SIMION, Lecturer Eng. Leonard LIVADARU, Eng. Ovidiu DABIJA, PhD, Eng. Florin LAZAR, PhD
In aceasta lucrare se prezinta comanda in regim de generator a unei masini cu reluctanta variabila trifazata, prevazuta cu 6 poli statorici si respectiv 4 poli rotorici. Pentru alimentarea infasurarilor de faza statorice s-au utilizat doua surse individuale …
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STUDY ABOUT THE DIAGRAM OF A TRANSFORMATIONS FOR A CLOCK-HOUR FIGURE OF THE VECTOR GROUP AT AN THREE-PHASE TRANSFORMER
Eng. Cristina PRODAN PhD, Prof. Eng. Adrian GRAUR PhD
Articolul evidentiaza ca trecerea de la un indice orar la altul se realizeaza prin parcurgerea diagramei transformarilor fie in sens trigonometric, fie in sens invers trigonometric. Parcurgerea diagramei trasnformarilor se poate face prin permutarea circular…
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DTC CONTROL OF ELECTRICAL DRIVES SYSTEMS WITH BLDC MOTORS
PhD Stud. Eng. Gheorghe URSANU, PhD Stud. Eng. Cristina DIACONESCU, Prof. Eng. Gheorghe BALUTA PhD
Tendintele actuale de limitare a pulsatiilor din cuplul motarelor BLDC au avut in vedere controlul direct al curentilor de faza ai acestuia pentru limitarea pulsatiilor ce apar la deconectarea fazelor statorice. In ultima perioada a crescut interesul pentru…
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STUDY OF INDUCTION MACHINE UNDER TRANSIENT DUTY AND STEADY-STATE AS SYNCHRONIZED MACHINE
Prof. Eng. Alecsandru Simion, PhD, Assoc. Prof. Eng. Leonard Livadaru, PhD, Assist. Prof. Eng. Adrian Munteanu, PhD
In vederea analizei masinii asincrone trifazate in regim de masina sincrona (masina asincrona sincronizata MAS) se apeleaza la ecuatiile diferentiale de ordinul I exprimate numai in fluxuri totale si unghiul de rotatie. Se obtine un sistem de 8 ecuatii care…
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OPTIMAL SELECTION OF SLOTS NUMBER PER POLE AND PHASE AT ROTATIONAL ELECTRICAL GENERATORS
Eng. Madalin COSTIN PhD Student, Assoc. Prof. Eng. Ion VONCILA PhD, Prof. Eng. Grigore FETECAU PhD
Problematica generatoarelor sincrone excitate cu magneti permanenti, utilizate in conversia energiei –ca particularitati disticte de proiectare optimala - este una de actualitate. In lucrare se dezvolta o metoda noua de determinare a numarului de crestaturi …
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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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STUDY ON SYNCHRONOUS GENERATOR WITH SMOOTH AIR GAP
Tudor AMBROS, Marcel BURDUNIUC, Nicolae URSATII (Republica Moldova)
Au fost analizate posibilitatiile de realizare a unui generator sincron cu magneti permaneti si intrefier neted. S-a dovedit analitic, disparitia armonicilor de ordin superior din curba de variatie a inductiei magnetic atunci cand infasurarea statorica este a…
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STUDY OF A 3 PHASE (6/4) SWITCHED RELUCTANCE MOTOR CONTROL
Nicolae-Daniel IRIMIA, Alecsandru SIMION, Leonard LIVADARU, Sorin VLASCEANU, Ovidiu DABIJA, Ana-Maria MIHAI
Controlul masinilor cu reluctanta variabila a cunoscut un interes din ce in ce mai crescut in ultima perioada, ca urmare a avantajelor si a diferitelor posibilitati de utilizare pe care le ofera aceste categorii de masini electrice. In lucrarea de fata este …
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NUTRITIA SI SARCINA - LEGATURA DINTRE ALIMENTATIE SI DIABETUL ZAHARAT
Dr. Luiza RADU
Acest articol prezinta date din literatura ce evidentiaza modul in care aportul alimentar al mamei in timpul sarcinii influenteaza starea de sanatate a nou nascutului. Perioada de gestatie trebuie privita de personalul medical ca si o oportunitate de a educa …
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SOME ASPECTS CONCERNING THE DURABILITY OF SERVICE AND DEVELOPMENT IN THE BUILDING SECTOR
Horea SANDI
The paper is aimed to present some ideas on the connection between the strategies of development of a safe and reliable infrastruacture as a whole and the components pertaining to the built environment. After a brief look on the development of methods of stru…
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CONCEPTUAL DESIGN OF RENEWABLE-BASED ENERGY MIXES FOR SUSTAINABLE COMMUNITIES
Ion VISA, Anca DUTA, Macedon MOLDOVAN, Bogdan BURDUHOS
The transition towards a new, sustainable and affordable energy pattern is defined in the European Union document known as SET Plan (The European Strategic Energy Technology Plan). As the built environment accounts for over 40% of the total energy consumption…
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MODERNIZATION ELECTRIC SUBSTATIONS 110/20 KV
Eng. Florin DRACEANU PhD, Assoc. Prof. Eng. Cezar Dumitru POPA PhD, Assoc. Prof. Eng. Dumitru Radu PENTIUC PhD, Assoc. Prof. Eng. Leon MANDICI PhD
The subjects ”connection to the national energy system installations producing renewable electricity " is topical and of great importance for future managers of wind power, photovoltaic, biomass cogeneration. Economic situation in Romania also influence the…
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WIND TURBINES OPERATION AND MAINTENANCE: PROBLEMS AND SOLUTIONS
Eng. Ana HAZI, Eng. Florin GHEORGHIU
In ultimii ani in Romania centralele eoliene au cunoscut o dezvoltare semnificativa, de la 10 MW la sfarsitul anului 2008, capacitatea totala de producere instalata si disponibila a energiei eoliene a ajuns la peste 1000 MW la inceputul anului 2012. O data …
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ENERGY MANAGEMENT SYSTEM OF HYBRID MICROGRID WITH ENERGY STOR
MSc. Mousa MARZBAND, MSc, Assoc. Prof. Andreas SUMPER, PhD - Spania, Prof. Mircea CHINDRIS, PhD, Assoc. Prof. Bogdan TOMOIAGA PhD
The economic scheduling of the generation units is playing a significant role in the energy management of the hybrid stand alone microgrid. Energy storage is an increasingly important part of the renewable energy sector because of the need to store power dur…