2015


27-71 CONSIDERAȚII ȘI CALCULE ASUPRA CAZANELOR LOCOMOTIVELOR CU ABUR Partea a II-a

CONSIDERATIONS AND CALCULATIONS ON BOILERS OF STEAM LOCOMOTIVES. PART II

Part II of the paper presents a brief history of rail transport, exposure of the first steam locomotive that circulated in our country and characteristics. In Part II of the paper presents a study and proposals for repair of the boiler of the locomotive. It analyzes the phenomena occurring inside the boiler during operation. The purpose of repairing steam locomotives is to be played recreational circuits in different geographical areas.

Keywords: steam locomotive, boiler, rail, recreation

Cuvinte cheie: locomotivă cu abur, cazan, transport feroviar, agrement

Descarcare text

 


27-70 CONSIDERAȚII ȘI CALCULE ASUPRA CAZANELOR LOCOMOTIVELOR CU ABUR Partea I-a

CONSIDERATIONS AND CALCULATIONS ON BOILERS OF STEAM LOCOMOTIVES PART I

Part I of the paper presents a brief history of rail transport, exposure of the first steam locomotive that circulated in our country and characteristics. In Part II of the paper presents a study and proposals for repair of the boiler of the locomotive. It analyzes the phenomena occurring inside the boiler during operation. The purpose of repairing steam locomotives is to be played recreational circuits in different geographical areas. Keywords: steam locomotive, boiler, rail, recreation Cuvinte cheie: locomotivă cu abur, cazan, transport feroviar, agrement

Descarcare text


27-69 DETERMINAREA DEFORMAŢIILOR LA O STRUCTURĂ ÎN ARC DE CERC

DETERMINATION OF DEFORMATION
TO A STRUCTURE IN AN CIRCULAR ARC
The paper presents the analysis of displacement to a structure in an circular arc. Displacements of free ends of the structure were analysed in dependence of the position of the anchorage.
Keywords: displacements, deformations, tare
Cuvinte cheie: deplasări, deformaţii, greutate proprie

Descarcare text


27-68 CALCULUL DIAGRAMELOR DE EFORTURI PENTRU GRINZILE DREPTE UTILIZÂND PROGRAMUL MATHCAD

THE COMPUTATION OF SHEAR DIAGRAMS, IN ACTION WITHIN STRAIGHT BEAMS, USING MATHCAD
The paper presents the program CRDEF-GGA-06 created by the author which calculates the reactions axial forces, bending moment respectively shear diagrams for straight static determinate beams.
The program CRDEF-GGA-06 is an application of MathCAD software.
Keywords: reactive, efforts, efforts diagrams
Cuvinte cheie: reacţiuni, eforturi, diagrame de eforturi

Descarcare text


27-67 STUDIUL COMPORTĂRII SUB SARCINĂ STATICĂ ȘI DINAMICĂ A GRINZII PRINCIPALE (profil I) A MACARALEI PORTAL (MACARA CAPRĂ) PARTEA II – STAREA DE DEFORMAȚIE A GRINZII PRINCIPALE ÎN MODUL DE LUCRU ”ANIMAȚIE”

THE STUDY OF THE BEHAVIOR UNDER STATIC AND DINAMIC LOAD OF THE MAIN BEAM (PROFILE „I”) OF A PORTAL CRANE (GANTRY CRANE)
PART II – THE STATE OF DEFORMATION OF THE MAIN BEAM IN THE „ANIMATION” WORKING MANNER
The lifting of the load at a certain height, its stop with a waiting of a 5 s, the descent of the load with a delay of 5 s, the descent of the load with its halt and waiting of approximately 5 s, leads to a certain load of the structure of the portal crane. Therefore one establishes that in the structure of the main beam appear compelled oscillations. In the frequency spectrum of the induced oscillatory motion, the main weight is that of the oscillation whose frequency is equal to the force in the driving cable; one establishes that the Eigen frequencies of the whole structure – the portal crane as a whole, are excited, too. Hence, the approach performed by the authors in the following study: a favourable working of the crane means that the Eigen frequencies of the structure as a whole must be outside the frequency field of the excitation forces, main beam: the state of stress and deformation under static and dynamic load.
Keywords: portal crane, force, structure, animation, frequency
Cuvinte cheie: macara portal, forță, structură, animație, analiză în frecvență

Descarcare text


27-66 STUDIUL COMPORTĂRII SUB SARCINĂ STATICĂ ȘI DINAMICĂ A GRINZII PRINCIPALE (profil I) A MACARALEI PORTAL (MACARA CAPRĂ) PARTEA I – STAREA DE DEFORMAȚIE A GRINZII PRINCIPALE SUB SARCINĂ APLICATĂ STATIC

THE STUDY OF THE BEHAVIOR UNDER STATIC AND DINAMIC LOAD OF THE MAIN BEAM (PROFILE „I”) OF A PORTAL CRANE (GANTRY CRANE)
PART I – THE STATE OF DEFORMATION OF THE MAIN BEAM UNDER STATIC LOAD
Because of the specific nature of the cranes’ activities, these ones have to accomplish a lot of norms concerning the security and labour protection. At the working beginning but also recurrently, the cranes are subjected to a test set in order to check the technical state with a view to the authorization. The verifications are performed by specializes departments and involve the following steps: ▪ the check of the main elements; ▪ tests of loads; ▪ tests under static and dynamic load; ▪ other tests which have in view the whole behavior of the crane.
With a view to the authorization all the tests are compulsory but the present paper presents the analysis of the main beam under the action of external loads. In the current activity one established that the imposed check in order to authorize the cranes are necessary but not enough to ensure those working safety. The present paper makes an important analysis of the main beam: the state of stress and deformation under static and dynamic load.
Keywords: portal crane, force, deflection, acquisition system, transducers
Cuvinte cheie: macara portal, forță, săgeată, sistem de achiziție, traductoare

Descarcare text


27-63 LEONARDO DA VINCI (15.04.1452 – 02.05.1519) INGINERUL ARTIST – GENIU UNIVERSAL Partea I-a

LEONARD DE VINCI (15.04.1452-02.05.1519). L’INGENIEUR ARTISTE – GENIE UNIVERSEL – PART I
L’article présente, d’une manière synthétique, les principales étapes de la vie et de l’activité du génial Léonard de Vinci. Son apprentissage dans l’atelier de Florence du maître Verrocchio a prouvé sa fécondité, car c’est là qu’il a appris les bases de la chimie, de la métallurgie, de la mécanique, ainsi que les techniques artistiques de dessin, de peinture et de sculpture en marbre ou en bronze. Son talent exceptionnel, le travail assidu, sa maîtrise dans de multiples domaines ainsi que la passion de savoir et d’expérimenter l’ont conduit à la réalisation d’œuvres admirables: «l’Annonciation», «L`Adoration des mages», « La Vierge aux rochers », « La Cène », «La Vierge, L`Enfant Jésus avec sainte Anne et saint Jean Baptiste », « La Vierge, L`Enfant Jésus et sainte Anne », « La Joconde », « La bataille d’Anghiari » etc. Tout aussi doué pour les arts que pour la recherche scientifique, l’ingénierie, toutefois passionné par l’étude des phénomènes naturels, expérimentateur, autodidacte, Léonard fait preuve d’une couverture encyclopédique de ses curiosités: anatomie, médicine, géologie, mathématiques, mécanique, résistance des matériaux, astronomie, hydraulique, architecture et fortifications, aviation, machines de guerre, étude des animaux et des plantes, etc. Léonard de Vinci incarne parfaitement l’esprit de la Renaissance à l’époque des «grandes découvertes» – le plus grand génie universel de tous les temps, curieux de tout, vouant toute sa vie à la recherche, au savoir, à l’art, et… à combattre le mal!
450
Mots-clés: art, la peinture, „sfumato”, architecture ingénierie, mécanique, résistance des matériaux, de l’anatomie, la médecine, l’eau, l’astronomie, la géologie Cuvinte cheie : artă, pictură, «sfumato», arhitectură, inginerie, mecanică, rezistenţa materialelor, anatomie, medicină, hidraulică, astronomie, geologie

Descarcare text


27-62 CLAUDE NAVIER – 230 DE ANI DE LA NAŞTERE

CLAUDE NAVIER – 230 YEARS SINCE HIS BIRTH
In this paper are presented aspects from the technical, didactical and scientifically activity of the most representative personality of the domain of Strength of Materials which even today constitutes a beacon in the development of this engineering domain. Navier has extremely important contributions to the substantiation of the Theory of Elasticity and the development of the Strength of Materials. By theoretical and practical research Navier established the basis for the calculations for resistance and rigidity of straight or curved bars, statically determinate or statically indeterminate. For plane plates Navier established the differential equation of the median deformed and studied behaviour for vibrations.
Keywords: neutral axis, suspension bridge, strength of materials, tension
Cuvinte cheie: axa neutră, pod suspendat, rezistența materialelor, tensiune

Descarcare text


27-61 CONSIDERAŢII PRIVIND STUDIUL PARAMETRILOR GAZODINAMICI LA DEPLASAREA CORPURILOR CU VITEZE SUPERSONCE ÎN PREZENŢA UNDEI DE ŞOC DETAŞATE

CONSIDERATIONS IN MOVING BODIES GAS DYNAMICS PARAMETERS STUDY WITH PRESENCE IN GEAR SUPERSONCE DETACHED SHOCK WAVE
This paper presents a method to study the parameters of flight in the atmosphere, the bodies’ neaerodinamics at supersonic speeds in the presence of detached shock wave.
Keywords: body neaerodinamic, shockwave, entropy wave resistance, kinetic energy, dash attack, Mach number
Cuvinte cheie: corp neaerodinamic, undă de şoc, entropie, rezistenţă de undă, energie cinetică, bord de atac, numărul Mach

Descarcare text


27-60 CONSIDERAŢII PRIVIND UTILIZAREA EFECTULUI CUMULATIV AL JETURILOR DE GAZE LA PERFORAREA BLINDAJELOR

CONSIDERATIONS FOR USE CUMULATIVE EFFECT
OF GAS STREAMS PUNCTURE ARMOR
This paper presents an application of the linear characteristics of the fumes generated by the chemical reaction of burning of explosives, the cumulative effect. By directing the energy of the explosion we obtain a jet of gas able to penetrate machines fight casings.
Keywords: jet gas, explosive, cumulative jet, armour, fighting machine, surge, movement potential
Cuvinte cheie: jet de gaze, exploziv, jet cumulativ, blindaj, maşină de luptă, undă de şoc, mişcare potenţială

Descarcare text


27-59 PROBLEME ALE SISTEMULUI DE RĂCIRE A ETANŞĂRILOR POMPELOR PRIMARE DE TRANSPORT AL CĂLDURII LA CNE CERNAVODĂ

CNE CERNAVODA PRIMARY HEAT TRANSPORT PUMPS GLAND SEAL COOLING SYSTEM PROBLEMS
Primary Heat Transport Gland Seal Cooling System scope is to provide a high pressure D2O cooling flow to the primary heat transport pumps seals. The system safety function is to maintain PHT pressure boundary integrity and to prevent radioactivity releases.
Keywords: pumps, gland seal, problems, CNE Cernavodă
Cuvinte cheie: pompe, etanşări, CNE Cernavodă, probleme

Descarcare text


27-58 MODELE PENTRU CALCULUL VIITURII MAXIME PROBABILE (VMP) ŞI ANALIZA DISTRIBUŢIEI ÎN TIMP Partea a II-a

MODELS FOR MAXIMUM PROBABLE FLOW CALCULATION AND THE TIME DISTRIBUTION ANALYSE – PART II
This paper presents an approach to estimate the maximum flow calculation and the time distribution analyse for different rivers from Romania.
Keywords: maximum probable flow calculation, time distribution, maximum probable rain
Cuvinte cheie: Viitura maximă probabilă, distribuție în timp, precipitația maximă probabilă

Descarcare text


27-57 MODELE PENTRU CALCULUL VIITURII MAXIME PROBABILE (VMP) ŞI ANALIZA DISTRIBUŢIEI ÎN TIMP Partea I-a

MODELS FOR MAXIMUM PROBABLE FLOW CALCULATION AND THE TIME DISTRIBUTION ANALYSE – PART I
This paper presents an approach to estimate the maximum flow calculation and the time distribution analyse for different rivers from Romania.
Keywords: maximum probable flow calculation, time distribution, maximum probable rain
Cuvinte cheie: Viitura maximă probabilă, distribuție în timp, precipitația maximă probabilă

Descarcare text


27-56 CAPACITATEA DE ÎNCĂRCARE A UNEI CENTRALE HIDROELECTRICE ÎN FUNCŢIE DE NIVELUL ÎN LACUL AVAL

THE LOAD CAPACITY OF A HYDROELECTRIC
POWER PLANT BY THE LAKE TO DOWNSTREAM
In the paper presents the results of measurements of the tailrace of the hydroelectric power Șugag underground HPP (high head cents) to determine the maximum power that can be achieved with the safe operation of the plant by Şugag HPP capacity transport manifold run it. The paper presents how to perform monitoring and protection system for monitoring water levels in tailrace.
Keywords: hydroelectric power plant, hydraulic turbine, efficiency, run gallery
Cuvinte cheie: centrală hidroelectrică, turbină hidraulică, randament, galerie de fugă

Descarcare text


27-55 DETERMINAREA SOLICITĂRILOR PRIZELOR DE APĂ CU CONDUCTE ÎNGLOBATE ÎN PILE

THE STRESS DETERMINATION FOR WATER
INTAKES WITH PIPES INSIDE PILES
This paper presents the initial stress calculations performed in order to validate a future innovative solution which incorporates both the sluices and the water intake with the supply pipes embedded within the concrete piles.
A brief calculus was done to estimate the supplementary forces involved in the dam stress. It starts from simplifying assumptions in order to estimate the stress supported by the concrete piles. The obtained results will be furthermore used to determine if the envisaged solution requires special methods of foundation or structural reinforcement.
Keywords: water intakes, supply pipes, dam cells, dams
Cuvinte cheie: prize de apă, conducte de alimentare, pile, baraje

Descarcare text


27-54 UTILIZAREA METODELOR NUMERICE PENTRU ESTIMAREA COEFICIENTULUI DE CONTRACȚIE AL UNUI ORIFICIU

THE USE OF NUMERICAL METHODS FOR ESTIMATING
THE CONTRACTION COEFFICIENT OF AN ORIFICE
This paper presents one of the numerical methods that integrate the Navier-Stokes equations, namely the method of finite differences, in order to determine the flowing through a tank and the contracted section of the liquid passing through an orifice.
Keywords: flow coefficient, current lines, orifice, numerical methods
Cuvinte cheie: coeficient de debit, linii de curent, orificiu, metode numerice

Descarcare text


27-53 CONSIDERAŢII TEORETICE PRIVIND CALCULUL DE REZISTENŢĂ ŞI AL DEFORMAŢIILOR CAMERELOR ROTOARELOR TURBINELOR AXIALE ORIZONTALE (BULB)

THEORETICAL ASPECTS REGARDING THE STRENGTH CALCULATION AND THE DEFORMATIONS OF THE HORIZONTAL TURBINE RUNNER CHAMBERS
This paper presents main theoretical considerations regarding the strength calculation and the deformations of the horizontal axial turbine runner chambers – upstream bulb. The most suitable functional and constructive solutions – for those bulb turbines which designed at Hydro-Engineering, the runner chamber has the lower half embedded in the concrete, and the upper half of this is fixed through a bolted threaded connection and threaded studs. The strength calculation of the deformations is made only for the upper half of the runner chamber.
The establishment of the fundamental equations regarding the strength and deformation calculations have been made taking into account the theory of the plane and curved plates of S. Timoshenko. For solving the equations and avoiding the in determinations it has been used the energetic method (Castigliano’s method). Considering the stressing types that are applied to the upper half of the runner chamber in the paper, it is shown the forces and moments that is stressing the threaded connection of the upper half in relation to the lower half which embedded in the concrete
Keywords: turbine, runner, deformation, bulb
Cuvinte cheie: turbină, rotor, deformaţie, bulb

Descarcare text


27-52 CONSIDERAŢII PRIVIND CONCEPŢIA MODELULUI DE VANĂ FLUTURE DESTINAT EFECTUĂRII CERCETĂRILOR EXPERIMENTALE

CONSIDERATIONS REGARDING THE BUTTERFLY VALVE MODEL DESIGN TO PERFORM THE EXPERIMENTAL RESEARCH
The paper presents a model of butterfly valve designed to perform experimental research in the laboratory to determine the functional parameters of industrial (prototype) butterfly valve. The model is designed considering the Froude similarity criterion based on the geometric dimensions and the design of the prototype valve having a nominal diameter of 4.9 m and operates at a pressure of 17.1 bar. The paper presents adaptations designed model can be mounted on the test bench for hydraulic turbines and experimental research can be obtained putting in optimal conditions.
Keywords: Butterfly valve model, testing stand, experimental research, similitude criterion
Cuvinte cheie: model de vană fluture, ştand se încercări, cercetări experimentale, criterii de similitudine

Descarcare text


27-51 CONSIDERAŢII PRIVIND CERCETĂRILE EXPERIMENTALE REALIZATE PE UN MODEL DE VANĂ FLUTURE

CONSIDERATIONS REGARDING THE EXPERIMENTAL RESEARCH PERFORM BY AN BUTTERFLY VALVE MODEL
The paper presents experimental research performed on a model of butterfly valve in the test stand of the testing laboratory to determine the functional parameters of a prototype butterfly valves ND 4900 mm who operating at a pressure NP17 bar. The valve model is designed and executed based on design and the size butterfly valve prototype applying Froude similarity criterion. It is presented the test stand and the experimental research results obtained regarding to determining the hydraulic resistance coefficient and consequently the flow coefficient and the determination of forces and moment coefficients, the coefficient of cavitation and vibration level.
Keywords: Experimental research, butterfly valve model, testing stand, coefficients
Cuvinte cheie: cercetări experimentale, model de vană fluture, stand de încercări, coeficienţi

Descarcare text


27-50 OPTIMIZAREA FORMEI DISCULUI VANEI FLUTURE CU COEFICIENT DE REZISTENȚĂ HIDRAULICĂ DE 0,07

BUTTERFLY VALVE DISC SHAPE OPTIMISATION FOR HYDRAULIC RESISTANCE COEFFICIENT 0.07
The paper presents the optimization of butterfly valve disc shape to obtain hydraulic resistance coefficient 0.07 by numerical methods and by experimental measurements realized in Hydro-Engineering Co. Reşiţa. It is presented the test stand, the optimized butterfly valve disc model which measurements were made and the results of model tests. The results of model tests conducted by similarity criterion for butterfly valve with nominal diameter 4900 mm and nominal pressure of 170 mwc consists of determining the hydraulic resistance coefficient and consequently the flow coefficient and the determination of forces and moment coefficients, the coefficient of cavitation and vibration level.
Keywords: disc butterfly valve, hydraulic resistance coefficient, numerical analysis
Cuvinte cheie: disc vană fluture, coeficient de rezistență hidraulică, analiză numerică

Descarcare text


27-49 MĂSURĂTORI DE VIBRAŢII DE JOASĂ FRECVENŢĂ LA TURBINE FRANCIS

LOW FREQUENCY VIBRATION MEASUREMENTS
ON FRANCIS TURBINES
This paper presents an analysis on vibration measurements performed on Francis turbines. Absolute vibration measurements on draft cone tube and proximate measurements on shaft were presented with respect to low frequency phenomena.
Keywords: absolute vibration, kurtosis analysis, relative vibration, draft cone tube
Cuvinte cheie: vibraţii absolute, vibraţii relative, con aspirator, analiza kurtosis

Descarcare text


27-48 ANALIZA EFECTULUI ROTIRII ÎN JURUL UNEI AXE A PALETELOR ROTORICE ALE TURBINELOR RAPIDE DE TIP FRANCIS ÎN VEDEREA MĂRIRII PERFORMANŢELOR ENERGO-CAVITAŢIONALE ALE ACESTORA

STUDY OF THE EFFECT OF THE FAST FRANCIS TURBINE BLADES’ SPIN AROUND AN AXIS, FOLLOWING CFD ANALYSIS OF FLOW AND RESULTS OF MEASUREMENTS IN THE LAB
The present paper propose an analysis of the rotation around an axis effect of the runner blades that compound the fast Francis turbines in order to increase their energo-cavitational performances. First step was done after the analysis of the runner which resulted from the calculations and hydro-dynamic design. This analysis was performed both theoretically using the finite element software package called CFX Blade Gen, and through experiment within the Test Laboratory for Hydraulic Turbines from Hydro-Engineering. Second step of the research consisted in rotating the blade around the axis with a certain angle in order to increase the absorbed flow, holding the rim and the ring from the initial blade. Rotating was performed in different angles by making the finite element analysis for all the rotating angles. In order to improve the cavitational component it was proposed and realized an extension of the blade with an appropriate covering degree, without any visible effect over the energetic features, these being maintained within the permitted error range that admitted by the IEC 60193 code.
Keywords: blade, runner, Francis
Cuvinte cheie: paleta, rotor, Francis

Descarcare text


27-47 ASPECTE PRIVIND EROZIUNEA CAVITAȚIONALĂ LA CONURILE ASPIRATOARE DE LA TURBINELE FRANCIS

ASPECTS OF CAVITATION EROSION AT SUCTION
CONES FROM FRANCIS TURBINES
In this article is presented the effect of cavitation applied to the suction cones that equip Francis turbines of HPP Motru. Cavitation erosion is evaluated through in-situ measurements are processed and presented in a new way in this article. It was determined a correlation between various regimes of functioning and the cavitation erosion appeared on the suction cones. Also experimentally was determined optimal maintenance period considering the cavitation attack intensity.
Keywords: cavitation, vacuum con, turbine, Francis, coefficients of cavitation, aeration
Cuvinte cheie: cavitație, con aspirator, turbină, Francis, coeficienți de cavitație, aerare

Descarcare text


27-46 DIMENSIONAREA TURBINELOR AXIALE

THE DIMENSIONING OF THE AXIAL TURBINES
In this paper is presented a new method for calculating the axial
hydraulic turbines, whose applicability is demonstrated by a numerical
example. This method is based on the torque developed by the turbine
rotor, which from reasons of simplicity, has been obtained by the 
theorem of dimensional analysis. Calculation results with the proposed
method for the flow of small water falls are in a good accordance with
those in the specialty literature. The method should be extended and
verified for large and medium flow and water falling.
Keywords: turbine, rotor, method, calculation, water, hydraulic,
axial
Cuvinte cheie: turbină, rotor, metodă, calcul, apă, hidraulic, axial

Descarcare text


27-45 SISTEME DE MONITORIZARE ÎN CONDIŢII DE RISC A CENTRALELOR HIDROELECTRICE CU ACUMULARE PRIN POMPARE (CHEAP)

MONITORING SYSTEMS IN HAZARDOUS CONDITIONS OF HYDROELECTRIC PUMPED STORAGE (CHEAP)
The primary purpose of modern automation purposes of modern automatic control systems of hydroelectric plants are:
– Automatic adjustment of speed (frequency) and/or power energy group known as Automatic speed control systems (SRAV)
– Automatic adjustment of the voltage generator known as automatic control systems excitation (SRAE)
– Adjust the water level in the reservoir and swirled flow, depending on the spatial requirements
– Protection hydropower group to failures, defects or on the electric or hydraulic side.
Keywords: automatic control systems, automatic adjustment of speed, generator voltage
Cuvinte cheie: sistemelor de conducere automată, reglarea automată a turaţiei, tensiunii generatorului

Descarcare text


27-44 INTERPRETAREA TENSIUNII INTERFACIALE LA ULEIURILE MINERALE ELECTROIZOLANTE FOLOSITE PENTRU TRANSPORTUL CURENTULUI DE ÎNALTĂ TENSIUNE

INTERPRETATION OF INTERFACIAL TENSION ON
MINERAL OILS USED AS CARRIERS OF ELECTRICAL CURRENT OF HIGH VOLTAGE
The interfacial tension against water is a polar soluble contaminants detection and degradation products . This feature is changing fast enough oil to trade vessels iniţial.Determinarea stage is commonly applied oils filled with insulating oil equipment in operation.
Keywords: interfacial tension, temperature, auto-transformers, oil analysis, hidroscopicitate electrical equipment
Cuvinte cheie: tensiune interfacială, temperatură, analize de ulei, autotransformatoare, hidroscopicitate, echipamente electrice

Descarcare text


27-43 STUDIUL EXPERIMENTAL AL COMPORTAMENTULUI DIELECTRIC AL DIGLICIDIL ETER DE BISFENOL ”A” ÎNCĂRCAT

EXPERIMENTAL STUDY OF THE DIELECTRIC
BEHAVIOR OF DIGLYCIDYL ETHER
OF BISPHENOL ”A” CHARGED
Subject reinforced composite materials are extensively investigated in recent years. This study is deepened to improve the structural and dielectric characteristics of diglycidyl ether of bisphenol A (DEGBE). Dielectric properties were analysed for each batch of material. Microcompozite epoxy samples with good dispersion of nano – particles laden epoxy matrix was prepared and experienced for the dielectric constant (C) , resistance (R ) and impedance (Z) frequency (1kHz, 10kHz) . Measurements were made using a dielectric spectoscropia plateau temperature range of between 20-80 °C . The better dielectric properties of the material corresponding to the nano – fillers in a concentration of 30 % .
Keywords: DGEBA, pozzolan, dielectric constants, microstructure
Cuvinte cheie: DGEBA, rocă vulcanică, constanta dielectrică, microstructură

Descarcare text


27-42 O PRIVIRE MATEMATICĂ ASUPRA PIERDERILOR PE LINIA DE TRANSPORT ÎN REGIM DEFORMANT

A MATHEMATICAL APPROACH TO THE LOSSES OF TRANSMISSION LINE UNDER NON-SINUSOIDAL REGIME
In this paper we present a mathematical proof of additional losses in the electrical energy transmission line due to superior harmonics. The proof is based on the Cauchy – Buniakovski – Schwarz inequality, a very important inequality in mathematics. Was considered a simplified model, but the obtained result generalizes to complex electrical circuits. At the beginning of the paper there was a more general overwiev of the issue of technological losses in power transmission line. Finally, we draw the conclusions and we indicate the references.
Keywords: electricity transmission line, transmission line losses, deforming operating system, mathematical proof of additional losses under deforming
Cuvinte cheie: linie de transport a energiei electrice, pierderi pe linia de transport, regim deformant de funcţionare, demonstraţie matematică a pierderilor suplimentare în regim deformant

Descarcare text


27-41 MODELAREA FIZICĂ A EFECTULUI CORONA LA TENSIUNE ALTERNATIVĂ

CORONA PHISICAL MODEL IN ALTENATIVE VOLTAGE
Corona discharge around power lines leads to line parameter alternation as an electric charge is formed around the wires. In transient states, such alternations result in faster damping of oscillations while in steady regime lead to additional energy losses. The paper treats the physical Corona modelling and the analytical transients process of voltages and currents on the proposed model.
Keywords: model, Corona, electronic scheme
Cuvinte cheie: model, efect Corona, schemă electronică

Descarcare text


27-40 CALCULUL PIERDERILOR DE PUTERE DATORATE EFECTULUI CORONA

CASLCULUS OF ELECTRIC POWER LOSSES
DUE TO CORONA EFFECT
The paper present the properly designed for Corona model required to produce reasonably close modelling of electric power losses on very high electric lines. Corona modelling has been approached by means of analogue physical or mathematical modelling is treated herewith.
Keywords: power losses, method, Corona, power lines
Cuvinte cheie: pierderi de putere, metodă, efect Corona, linii electrice

Descarcare text


27-39 STUDIUL BIOSISTEMULUI PEȘTI ELECTRICI (P.E.)

STUDY BIOSYSTEMS ELECTRIC FISH (P.E.)
Understanding the phenomena that are specific electrical biosystems, the existence of specialized cells for detecting, measuring and storing electricity, which enable these phenomena. Finding sources of electricity inspired by natural model, but other research direction as the electric discharge and electrical insulation. With the technical model, visualizing electrical discharges of different voltages and currents, check some assumptions-assumptions to an embodiment of the primary data.
Keywords: autologous, non-autologous electrical, impulse nerve, corticalii centers, electric shock, synapses, dendrites, electrical nerve
Cuvinte cheie: autolog16, non-autolog electric, impuls nervos, centri corticali, șoc electric, sinapse17, dendrite, nervi electrici

Descarcare text


27-38 ANALIZA ENERGETICĂ A UNEI ZONE ÎN SCOPUL RACORDĂRII UNEI CEE DE 45 MW

ANALYSE DE L’ÉNERGIE D’UNE ZONE DE CEE VISANT A APPORTER 45 MW
L’article présente l’analyse énergétique d’une zone territoriale appartenant à une filiale de distribution de l’énergie électrique. L’analyse vise l’évaluation de la puissance générée, consommée et la capacité de distribution du réseau.
Mots-clés: électricité, la production d’électricité, génération, la consommation
Cuvinte cheie: energie electrică, generare, consum

Descarcare text


27-37 IMPLEMENTAREA STANDARDULUI ISO DE MANAGEMENT AL ENERGIEI ÎN ROMÂNIA

THE IMPLEMENTATION OF ISO ENERGY
MANAGEMENT STANDARD IN ROMANIA
This paper analyses the state of certification for energy management system (EnMS), ISO 50001: 2011, in Romania. The analysis is divided into factors that influence the increase in the number of companies certified to ISO 50001. Relevant information encountered in the training of staff, consulting to document EnMS and certification audit are presented. It is highlighted the importance of energy efficiency and the role of company`s management and other stakeholders.
Keywords: ISO 50001, energy management, energy intensity
Cuvinte cheie: ISO 50001, management energetic, intensitate energetică

descarcare text


27-36 IMPLICAREA INGINERIEI MULTIDISCIPLINARE ÎN DIMINUAREA SMOGULUI ELECTROMAGNETIC GLOBAL

THE INVOLVEMENT OF MULTIDISCIPLINARY ENGINEERS IN REDUCING GLOBAL ELECTROMAGNETIC SMOG
The author, specialist and promoter of the IT&C and knowledge’s management, present a synthesis of legal regulations of the Technology Communications in Romania, according with the European legislation, which stimulates and optimizes the real economy to a durable development. Concretely, they approach technical, the legality imposed by the Romanian Parliament and ANRC, according with the European regulations, as well implications communications mobile of the human nature, trade from the global network aspects.
Keywords: GSM, ANRC, knowledge management, durable development, communications mobile, network communications, biological implications, radiation intensity
Cuvinte cheie: GSM, ANRC, managementul cunoaşterii, dezvoltare durabilă, comunicaţii mobile, implicaţii biologice, intensitatea radiaţiei

Descarcare text


27-35 CREŞTEREA BOVINELOR ÎN CONTEXTUL STRATEGIEI DE DEZVOLTARE RURALĂ A ROMÂNIEI

CATTLE BREEDING IN THE CONTEXT OF ROMANIA’S RURAL DEVELOPMENT STRATEGY
This paper presents an analysis over the National Rural Development Programme implementation, with particular regard over the cattle breeding as the main agricultural sector and major importance in the European and world wide economy.
Keywords: cattle, agricultural policy, rural development
Cuvinte cheie: bovine, politici agricole, dezvoltare rurală

Descarcare text


27-34 FINANŢAREA AGRICULTURII PRIN PNDR – CE ESTE ŞI CARE SUNT ETAPELE

AGRICULTURE FUNDING THROUGH PNDR – WHAT
IT IS AND WHICH ARE THE STAGES
This paper briefly presents the possibility of developing a rural area, using European grants. It describes, without going into details, the process/ steps to be followed in order to access European funds.
Keywords: PNDR, Europeans funds, rural development
Cuvinte cheie: PNDR, fonduri europene, dezvoltare rurală

Descarcare text


27-33 ÎMPUTERNICIREA ŞI DELEGAREA RESPONSABILITĂŢILOR – CHEIA CREŞTERII ORGANIZAŢIONALE

EMPOWERMENT AND DELEGATION OF RESPONSIBILITIES – THE KEY ORGANIZATIONAL GROWTH
To be able to fulfil the goals and objectives, organizations must identify the appropriate modalities to keep people motivated and enthusiastic, state that will have a beneficial impact over the entire organizational climate, but the employee relationship with people outside the organization. One of these means is empowering people, whereas, therefore, they are creating trust and they are determined to use their knowledge and experience in order to achieve the desired results.
Keywords: empowerment, delegation, organization
Cuvinte cheie: împuternicirea, delegarea, organizaţie

Descarcare text


27-32 SIMULAREA FLUXURILOR DE PRODUCŢIE

SIMULATION OF PRODUCTION FLOWS
Flow Simulation is a method which provides great help in taking a decision regarding production problems. Use by a production flow mechanism knower, together with several modules which helps optimisation, simulation becomes a valuable instrument for flow optimisation.
Keywords: production flow, simulation, software simulation, discrete event, simulation report
Cuvinte cheie: flux de producţie, simulare, program de simulare, evenimente discrete, raport de simulare

Descarcare text


27-31 ANTREPRENORIATUL SOCIAL ÎN CONTEXTUL FENOMENULUI DE IZOMORFISM INSTITUȚIONAL

SOCIAL ENTREPRENEURSHIP IN THE CONTEXT
OF INSTITUTIONAL ISOMORPHISM
Considering that social enterprises represent one of the possibilities to respond to growing social needs, this article will try to give a new definition to the concept. We will discuss the position of social enterprises starting from the theory of institutional isomorphism developed by DiMaggio and Powell in 1983 and from the concept of natural selection and survival of the fittest introduced by Darwin and used in modern economy. We will also define social enterprises in accordance to these constraints as being similar to traditional for-profit organizations in terms of form and function but with differences in mission and profit distribution.
Keywords: social economy, social entrepreneurship, institutional isomorphism
Cuvinte cheie: antreprenoriat social, izomorfism instituţional, economie socială

Descarcare text


27-30 IMPACTUL TEHNOLOGIILOR INFORMAȚIONALE ÎN DOMENIUL EDUCAȚIONAL

L’IMPACT DES TECHNOLOGIES DE L’INFORMATION DANS L’ÉDUCATION
L’un de principal objectif de l’éducation moderne est celui de l’amélioration des procès d’enseignement – apprentissage, qui utilise les nouvelles technologies multimédia. Ces nouvelles technologies changent le monde qui nous entoure. L’éducation de plus haute qualité est essentielle pour le succès sur le marché du travail et pour pouvoir survivre dans un environnement très compétitif.
Dans le domaine de l’éducation, pendant les derniers dix années, l’utilisation de l’internet a connu un développement phénoménal, et il y a une série de facteurs qui influencent l’adoptassions des technologies web et multimédia dans les programmes d’enseignement. Aujourd’hui, les professeurs qui intègrent la technologie IT dans le procès d’éducation, en utilisant une variété de stratégies d’instruction, aident les élèves de développer leurs compétences de pensée et d’apprentissage, et, grâce à ce méthode, les élèves sont profondément impliqués, ils se sentent provoqués, en devenant responsables de leur propre procès d’apprentissage.
Mots-clés: l’éducation, enseignants, étudiants, technologies de l’information, e-learning
Cuvinte cheie: educație, profesor, elev, tehnologii informaționale, e-learning

Descarcare text


27-29 INGINERIA ȘI MANAGEMENTUL RISCULUI ÎN PROCESELE INDUSTRIALE

ENGINEERING AND RISK MANAGEMENT
IN INDUSTRIAL PROCESSES
The objectives of the company require knowledge and multiple risk taking. Risk management process consists of three stages: risk identification, risk analysis and response to risk. Identification of risk is achieved by making checklists, organizing meetings risk identification and analysis of archived documents. Risk analysis using methods such as determining the expected value, Monte Carlo simulation and decision trees. Responding to include measures and actions for risk reduction or elimination of risk allocation [1].
Keywords: Engineer, Risk management, Industrial processes, Standards
Cuvinte cheie: inginerie, managementul riscului, procese, standarde

Descarcare text


27-28 UTILIZAREA PREZENTĂRILOR POWER POINT ÎN PROCESUL DE PREDARE – ÎNVĂȚARE

USING POWERPOINT PRESENTATION IN TEACHING LEARNING
In the present study has revealed the correct way of presenting courses conducted by the presentations Power Point. There appeared mistakes and how to make a presentation of suscces, namely those presentations that are used in learning activities.
Keywords: computer, software, presentation, Power Point
Cuvinte cheie: calculator, soft, prezentare, Power Point

Descarcare text


27-27 UTILIZAREA SOFTURILOR DE CREARE A CUVINTELOR ÎNCRUCIȘATE LA EVALUAREA ÎNVĂȚĂRII

USING CROSSWORD CREATION SOFTWARE
TO LEARNING EVALUATION
While the implementation of complex learning systems is not adequate for certain educational establishments as well as for certain courses, teachers are open to any efficient tool that can adequately contribute to the instructional and learning processes. Our research included a between-subjects post-test only study of the various manners of utilization of Hot Potatoes and explores the research hypothesis that the use of digital tools to increase information processing leads to observable increase in academic performance. Crosswords created in Hot Potatoes were used to enrich the information processing involved in students’ solving of homework. 1st year undergraduate students enrolled in the Classroom of Teaching technical specialty course participated in the study and were distributed in one control group and two experimental groups.
Keywords: evaluation, computer, education, ICT, click, Hot Potatoes
Cuvinte cheie: evaluare, calculator, învățământ, TIC, click, Hot Potatoes

Descarcare text


27-26 SĂ ÎNVĂŢĂM DE LA COPII

TO LEARN FROM KIDS
The children’s universe is mental rather than material. The adult has lost along of time the child’s potential. Learning from children is therefore a necessity if we want that the society to evolve in a positive way. It is time to learn from children.
Keywords: child, potential, adult, evolution
Cuvinte cheie: copil, potenţial, adult, evoluţie

Descarcare text


27-25 TRIUNGHIUL CUNOAŞTERII: EDUCAŢIE-CERCETARE-INOVARE

KNOWLEDGE TRIANGLE:
EDUCATION-RESEARCH-INNOVATION
In the context of the transition to the knowledge society, the European Union aims to insure framework for smart, sustainable and inclusive growth. The society based on knowledge and innovation involves integration of new technological infrastructures, research processes, development and innovation, as well as the educational, contributing directly to the development of intellectual capital, the main resource of current society.
This paper presents the relationship between the three sides of the knowledge triangle, education, research and innovation and interdependence between them.
Keywords: knowledge society, education, research, innovation, progress
Cuvinte cheie: societatea cunoaşterii, educaţie, cercetare, inovare, progres

Descarcare text


27-24 UNDELE STAȚIONARE CU SIMETRIE HEXAGONALĂ DE TIP FLOAREA VIEȚII GENERATE PRIN STIMULARE ACUSTICĂ INFRASONICĂ 14 HZ. COINCIDENȚE SIMBOLICE, ARHETIP-UNDĂ STAȚIONARĂ

STANDING WAVE HEXAGONAL SYMMETRY FLOWER OF LIFE GENERATED BY TYPE 14 Hz INFRASONIC ACOUSTIC STIMULATION. COINCIDENTALLY SYMBOL ARHETIP – STANDING WAVE
Therefore, the dynamic polygonal or polyhedral geometries rhythmically alternate between complementary geometric antipodes, being, in fact, instances of the same standing wave; the induction by a vibrational contribution of the stationary periodic oscillation in the pulverulent or fluid matter institutes itself as a centre of real becoming’s, undoubtedly tangible and yet elegant, overlapping experimental empiricism with the aesthetics of geometric becoming’s, all under the ineffable corolla of kinetic harmonies started at the gracious confluence between experiment and artistic creativity. A cycle of geometric metamorphoses of the surface of a wave made in volatile liquids (ethanol) at a frequency of 14 Hz, with the appearance of an ancient Mediterranean symbol, generically called the Flower of Life.
Keywords: Flower of Life, infrasound, nonlinearity, cosmology, vortex, fluid, stationary wave, hexagon, triangle, geometry
Cuvinte-cheie: Floarea Vieții, infrasunete, neliniaritate, cosmologie, vârtej, fluid, val staționar, hexagon, triunghi, geometrie

Descarcare text


27-23 ASPECTE PRIVIND PRELUCRAREA OSHIBANA A FLORILOR DIN CATEGORIA ERYTHRONIUM DENS CANIS

ASPECTS REGARDING OSHIBANA PROCESSING OF
ERYTHRONIUM DENS CANIS FLOWERS
Erythronium Dens Canis is a spring flower with high visual impact due to its petal disposing as a radiate crown in the early stage and as an open dog mouth in the later stage. The visual effect is enhanced by stamina position in the centre of the flower. Such nice flower worth’s to be processed by Oshibana method. We collect several flowers from Faget Woods nearby Cluj Napoca, Romania, in several development stages: bloom, early opened flower and mature opened (late) stage. All were pressed according to the best option: large numbers of paper pages between flower layers and average loading of around 3 kg uniform distributed over an A4 page format. The optical microscopy evidence a good pressing of the petals with a good cohesion among cellular walls. The final test shows that the Erytronium Dens Canis pressed flowers are suitable for Osibana compositions.
Keywords: Oshibana, Erythronium Dens Canis
Cuvinte cheie: Oshibana, Erythronium Dens Canis

Descarcare text


27-22 STUDIU ISTORICO-CRITIC AL ANEMOMETRIEI

HISTORICAL AND CRITICAL REVIEW OF THE ANEMOMETRY
In this paper, on the base of extensive documentary, are present the main events and facts, which have had led to the evolution in time of both anemometry and the thermo-anemometry. At the same time, it shows the priority development of anemometers and thermo-anemometers. This study will be helpful to the specialists skilled in this area.
Keywords: anemometer, therm-anemometer, kata-thermometer, speed, wind, air, palette, cup
Cuvinte cheie: anemometru, termoanemometru, catatermometru, viteză, vânt, aer, paletă, cupă

Descarcare text