Gelu OPRIŞA


29-24 ASUPRA UNOR PREOCUPĂRI ȘI MANIFESTĂRI UMANE

ABOUT SOME HUMAN PREOCUPATIONS AND
MANIFESTATIONS
„Living is fighting” said the ancient philosopher Seneca and he spoke
truth. The are some concerns to analyse: words, writing, self-improvements, as
well as some manifestations: hope, doubt, and all characteristic of Homo
sapiens. They are some virtues to rival, such as: honesty, respect for truth, and
self-improvements as ideal sources for acquiring mental strength and purity as
well.
Keywords: word, writing, perfection, hope, doubt, purity
Cuvinte cheie: cuvântul, scrisul, desăvârşirea, speranţa, îndoiala,
puritatea

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27-82 INFLUENŢA FENOMENELOR DE ECRUISARE ŞI ÎMBĂTRÂNIRE ASUPRA MODULULUI DE ELASTICITATE

THE INFLUENCE OF COLD-HARDENING AND AGING
ON THE COEFFICIENT OF ELASTICITY
Existing industrial steel structures, and especially those we use in the steel industry, for whom the normal operation age is approaching completion, are affected by the phenomena of cold-hardening and aging of steel. Depending on the size tension (unit stress) and the period of running, this paper is intended to adopt a different coefficient of longitudinal elasticity corresponding to components of the resistance structure.
Keywords: hardening, artificial aging, elastic modulus, strength, tension (unit effort)
Cuvinte cheie: ecruisare, îmbătrânire artificială, modul de elasticitate, rezistenţă mecanică, tensiune (efort unitar)

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19-61 SISTEM DE CONTROL AL MAŞINII ASINCRONE CU ROTOR BOBINAT ÎN APLICAŢII EOLIENE

CONTROL SYSTEM OF AN WOUND INDUCTION
GENERATOR IN WIND APPLICATIONS
This paper presents a control model of a drive system with wound
induction generator and rotor converter for variable speed wind power station.
For design optimization of power and control the simulations are used.
Keywords: renewable energy, wound rotor induction generator, the rotor
converter, control, simulation
Cuvinte cheie: energii regenerabile, generator asincron cu rotor bobinat,
convertor rotoric, control, simulare

61 SISTEM DE CONTROL AL MAŞINII ASINCRONE CU


23-70 MODULUL DE ELASTICITATE A OŢELULUI DIN STRUCTURILE METALICE INDUSTRIALE EXISTENTE

THE COEFFICENT OF STEEL ELASTICITY OF THE
EXISTING INDUSTRIAL STEEL STRUCTURES
Existing industrial steel structures, and especially those we use in the
steel industry, for whom the normal operation age is approaching completion,
are affected by the phenomena of hardening and aging of steel. Depending on
the size tension (unit stress) and the period of running, this paper is intended to
adopt a different coefficient of longitudinal elasticity corresponding to
components of the resistance structure.
Cuvinte cheie: ecruisaj, îmbătrânire, modul de elasticitate,
tensiuni, valoare
Keywords: ecruisaj, aging, elasticity module, tension, value

23-70 MODULUL DE ELASTICITATE A OŢELULUI DIN STRUCTURILE METALICE INDUSTRIALE EXISTENTE


21-98 SIGURANŢA STRUCTURILOR METALICE ÎN EXPLOATARE

THE SAFETY IN EXPLOITING METALLIC
CONSTRUCTIONS
The paper analyses the safety in exploiting metallic constructions. In
order to verify the limit conditions, corrections were introduce by using some
dimensionless numerical coefficients, determined for each analyzed limit
condition, which will cover unfavorable influences of different factors.
Cuvinte cheie: siguranţă, stare limită, coeficienţi, îmbinare
Keywords: safety, level measurement, ratios, jointing

98 SIGURANŢA STRUCTURILOR METALICE