Anul XIII (2006), Nr. 1
Laser Surface Thermal Treatment Applied to Stainless Steel X5 CrNi 18 10
Daniel Amariei ,
Florin Breaban ,
Constantin Marta
The paper propose to mark out the influence of different control parameters of laser beam light over the entire surface thermal treatment applied and, also, the physical and technological proprieties of the stainless steel obtained layer
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Implement of Shape Memory Alloy Actuators in a Robotic Hand
Daniel Amariei,
Ion Vela,
Wolfgang Ziegler
This paper was conceived to present the ideology of utilizing advanced actuators to design and develop innovative, lightweight, powerful, compact, and as much as possible dexterous robotic hands. The key to satisfying these objectives is the use of Shape Memory Alloys (SMAs) to power the joints of the robotic hand. The mechanical design of a dexterous robotic hand, which utilizes nonclassical types of actuation and information obtained from the study of biological systems, is presented in this paper. The type of robotic hand described in this paper will be utilized for applications requiring low weight, power, compactness, and dexterity.
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The Simulated Process of a Production System using the Extend Program
Olga Ioana Amariei ,
Guillaume Cavory ,
Constantin Marta ,
Daniel Vela
With the help of the simulated process, it could be realized all kind of experiments on a model. It could be tested lots of ideas, a returning in time to make possible remaking of manipulation scripts of some key variables with the purpose of observation based on experiments the effect above some important indicators of performances.
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The using of Simulated Models in Management
Olga Ioana Amariei ,
Guillaume Cavory ,
Constantin Marta ,
Raul Maloş
The paper brings up many explanations regarding the understanding of connections between causes and effects, through simulated models. It wishes to establish and simulate some scripts witch concur to the development of a business.
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Contributions for Setting the Technological Parameters in Ultrasonic Welding Process of Intelligent Composites with Polymeric Matrix
Gheorghe Amza ,
Zoia Apostolescu ,
Tudorel Ene
The paper describes the parameters in ultrasonic welding process of
intelligent composites with polymeric matrix. Process parameters are
divided in three different categories: technological parameters,
mechanical parameters and acoustical parameters. Technological
parameters are given special attention, and their influence on welding
quality is analyzed.
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Theoretical Research Regarding the Modeling of the
Ultrasonic Piezoceramic Assembly
Gheorghe Amza ,
Constantin Radu ,
Tudorel Ene ,
Catalin Gheorghe Amza
This paper presents the design of n transducertool of an ultraacoustic
system for finishing processing through cutting. Finite element
modeling of the horntool using ANSYS software package allows the
analysis of the tension and deformations state along it showing
especially the values of the amplitude in the active area.
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The Projection of the Classification Systems of
Management. Analysis and Evaluation
Solomia Andres
In this paper I want to make the analysis of management styles by
applying the methods which allow the assurance of a comparator
system, to make possible a calculation of some indicators to
differentiate the managers. The analysis conclusion – there aren’t valid universal styles, only
different and adaptable styles.
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Modern Method Applied to Reach The Organisation’s
Objectives – Mixed Project Based Management
Solomia Andres
The paper presents the procedure, the technique and the working
instrument, which do not confine only to applying a management
principle, but they also contribute to the management’s organisational
strentgthening. Promoting this system based on the mixed project
management can significantly contribute to the acceleration of
introducing new products in the Romanian economy, to the
retechnologisation of trade companies and autonomous administration
companies on the basis of economical criteria, capitalising on the
market economy’s specific mechanisms.
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The Gradient Method – A Matriceal Algorithm Used
in Optimization
Cornelia Victoria Anghel
In the paper is the mathematical gradient method described and an
eloquent numerical example is given. The Matriceal gradient method is
used in optimization problems. As the result we obtain the optimum of
the function. The advantage of this method is that in some conditions
can minimized the order of the matrix.
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MultiParameter Analysis of Surface Finish in
ElectroDischarge Machining of Tool Steels
Cornelia Victoria Anghel ,
Georgios Petropoulos
The paper presents a multi parameter analysis of surface finish
imparted to toolsteel plates by electrodischarge machining (EDM) is
presented. The interrelationship between surface texture parameters
and process parameters is emphasized. An increased number of
parameters is studied including amplitude, spacing, hybrid and fractal
parameters,, as well. The correlation of these parameters with the
machining conditions is investigated. Observed characteristics become
more pronounced, when intensifying machining conditions. Close
correlation exists between certain surface finish parameters and EDM
input variables and single and multiple statistical regression models are
developed.
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Considerations Regarding the Use of the Time
Frequency Representations in Analysis of Vibrations
Florin Constantin Berinde ,
GilbertRainer Gillich
Timefrequency representations are modern tools in analyzing various
signals, including that obtained by measurements of vibrations. A great
number of this kind of tools are available, it is the researcher’s expertise
which lead to the use of the proper one. The authors, based on
their expertise in handling data acquisition and analysis trough timefrequency
representations, present in the paper considerations regarding
the use of this tools, in connection with the operating system’s performances.
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Proper Selection of Ultrasound Level Meter for the
Flow Rate Measurement in Open Canals
Sinisa Bikic ,
Masa Bukurov
There are a great number of ultrasound sensors for the level measuring, as
well as ultrasound devices for the flow rate measuring in the market. “The
best” sensor for level measuring doesn’t exist, nor exist “the best” flowmeter
in open channels. There is only sensor or flowmeter which corresponds in
the best manner to a certain project task. The idea of this paper is to give
directives how to choose ultrasound level sensor and ultrasound flowmeter
which should in a best way relate to a project requirements.
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Substantiating the Decision Regarding the Acquirement
of Ships used in Seagoing Transport
Ion Botescu
The tonnage call and bid has suffered a cyclic evolution on the international
seagoing transport market. More than that, the person that
wishes to acquire a ship must take into consideration a series of elements.
The economical reasoning as well as the international practice
emphasize that the profit coming from exploitation prevails over the initial
price of the acquisition when the buyer focuses on a certain type of
ship. In the current paper we approach the naval investments problems
from this perspective.
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The Role of Multinational Companies in the Deployment
of Foreign Direct Investments
Ion Botescu
In the last decades multinational firms have become the leading actors
of the international markets, including markets in developing countries.
A multinational firm’s decision to open a branch or a subsidiary in another
country, thus to invest abroad, is based on efficiency criteria, the
obtained profit having a primordial aspect. We mustn’t forget the various
advantages the host country befits of, here mentioning the transfer
of technology. The unprecedented foreign amalgamation of multinational
firms was brought on by the continuous liberalization of international
commerce and investment fluxes.
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Reference Values in Evaluating Effects of Vibrations
on Buildings and Persons
Polidor Bratu ,
GilbertRainer Gillich
Buildings can be affected by vibrations if theirs parameters outgrow
certain limits. The nature of the damage is given by the value of this
parameters (displacement, velocity or acceleration). The paper presents
reference values adopted in different countries regarding the
maximum admitted level of vibrations.
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The Innovating Enterprise
Jeanina Biliana Ciurea
The technological revolution triggers important transformations at the
company level. In the context of the transition towards an economy
based on knowledge and of the increasingly sharp competition at the
global level, the competitiveness of a company is determined by its capacity
to invest in knowhow, technologies and knowledge which allow
it to optimise the effects obtained at the level of the company as a result
of the creation and sale of certain new technologies. In an economy
based on knowledge, the competitive company is receptive to the
novelties of the environment, able to continuously and rapidly adapt to
the changes brought by the technical progress. The managers of great multinational holdings have become aware of
the fact that, in the long run, the only way to achieve the continuous
improvement of performances, to satisfy the shareholders’ goals of
maximising the company value, to increase the employees’ satisfaction,
to maintain competitiveness and a top position in the industry where
the company operates, is to innovate.
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Content Management System Used in Monitoring of a Photovoltaic Plant
Cristian Chioncel ,
Petru Chioncel ,
Florin Berinde ,
RainerGilbert Gillich
The paper presents the facilities of a new content managemnt system (CMS), TYPO3, based on the example of a coomon scientific research portal, between Fachhochschule Gelsenkirchen Germany and the «Eftimie Murgu» University Resita Romania, the so called «Solar Competence Exchange».
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Evolution of Multidirectional Wheels Researches
Vasile Cojocaru
The problem of the insufficient space for the internal transport in industrial
halls have generated new constructive solutions of wheels, able to
facilitate the movement of vehicle in any direction without a rotation of
chassis. The main types of multidirectional wheels are presented in this
paper (Grabowiecki patent, Mecanum wheel, Kilough platform, Blumrich
wheel). In the final part of the paper a graphical analyses of the
economized space by omnidirectional vehicles is presented. The paper
represents a bibliographical study.
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The Computerised Calculus in the Prognosis of the Phase
Equilibrium Diagram of the Ternary System AlCuSi
Florentina A. Cziple
The paper presents a model for establishing the mathematical functions of
the liquidus and solidus curves, from the binary diagrams AlSi, SiCu, CuAl and
their use in the prognosis of the phase equilibrium diagram from the ternary
system AlCuSi. We have studied the model of the nonideal liquid solution of the
regular type. The calculus and graphic plotting of the equations for the binary
systems has been performed on the computer with the software programmes
MathCad 2000 Professional, Statistica 5, Curve Expert, and for the ternary system
AlCuSi, with the 3D StudioMax software.
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The Establishment, Plotting and Statistic–
Mathematical Interpretation of the Liquidus Surface
from the Phase Equilibrium Diagram of the Ternary
System AlCuSi
Florentina A. Cziple
The paper forwards the conclusions of a survey performed on a
mathematical model of the phase equilibrium from the ternary system
AlCuSi. The author presents the calculus of the statistic equation of
the liquidus surface model from this diagram, the plotting and
statisticalmathematical interpretation of the results obtained.
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Total Quality Management, a New Culture Model of the Enterprise
Constantin Dumitrescu ,
Olga Ioana Amariei ,
Raul Malos ,
Daniel Vela
The paper brings bags of clarifications about concept definition and
bases principles of TQM, presenting the critical factors during the implementation
of those fundamentals. Also, it has been proposed a lot of
models to present the Total Quality Management, being also presented
its evolution.
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Study Regarding the Behavior of 12Cr 130 (W 4006)
Steel for HydroEnergetic Applications During Welding
Tudorel Ene ,
Carmen Maria Ene ,
Dorel Spiru Dumitriu
The topic of the work consists in the research of the W4006 (12Cr 130)
steel behavior during welding in order to establish the welding technology
for a runner chamber of the hydraulic turbine following: testing the base
material of the runner chamber, choice of welding procedure and filler
materials, determination of the welded joint chemical composition,
determination of the preheating temperature, thermal treatment applied
after welding, experiments and results.
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Application Regarding the ButtWelding Through
Intermediate Melting
Tudorel Ene ,
Carmen Maria Ene ,
Dorel Spiru Dumitriu
It consists in presenting butt welding procedure through intermediate
melting and its usage for manufacturing cutting tools type drill, tap screw,
reamer by welding the active part (made of highspeed steel) to the tool
tail (made of unalloyed steel wit low carbon).
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Pricing the Innovation for Market Introduction
Danut Tiberius Epure
The factors that influence pricing strategy change over the life of a
product concept. The market defined by a product concept passes
through four phases: development, growth, maturity, and decline.
Briefly, the changes in the strategic environment over those phases are
as follows: Market development. Buyers are price insensitive because
they knowledge of the product’s benefits. Both production and not a
threat since the potential gains from market development exceed those
from competitive rivalry. Pricing strategy signals the product’s value to
potential buyers, but buyer education remains the key to sales growth.
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Future of Computing. Nanotechnology
Florin Frant
Nanotechnology is a field of applied science and technology covering a
broad range of topics. The impetus for nanotechnology has stemmed
from a renewed interest in colloidal science, coupled with a new generation
of analytical tools such as the atomic force microscope (AFM)
and the scanning tunneling microscope (STM). Combined with refined
processes such as electron beam lithography, these instruments allow
the deliberate manipulation of nanostructures, and in turn led to the
observation of novel phenomena.
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Analysis of Time Discretization and its Effect on Simulation Processes
GilbertRainer Gillich ,
Cristian Paul Chioncel ,
Florin Constantin Berinde
The paper presents the influence of time discretization on the results of simulations of technical systems. In this sense the systems are modeled using the SciLab/SCICOS environment, using different time intervals. Ulterior the processes are simulated and the results are compared.
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Industrial Sources of Pollution by Vibrations –
Causes and Behavior
GilbertRainer Gillich ,
Florin Constantin Berinde
Pollution by vibrations caused by industrial sources is extremely unpleasant
if in their proximity are build areas. The authors present a
classification of this kind of sources and the way how the vibrations are
produced and propagated. Parameters of vibrations, their attenuation
trough the ground and impact on the build structures is also illustrated.
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Double Harmonic Transmission (D.H.T.)
Sava Ianici ,
Draghita Ianici
The paper presents the construction and functioning of a new type of
harmonic drive named double harmonic transmission (D.H.T.). In the
second part of this paper is presented the dynamic analysis of the
double harmonic transmission, which is based on the results of the
experimental researches on the D.H.T. This study of the stress status
and the forces distribution is necessary for to determine the durability
on the portant elements of the D.H.T.
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Contributions of Determining the Forces Distribution
in the Harmonic Drive
Sava Ianici ,
Draghita Ianici
The paper presents an original method for determining the forces distributions
on the portant elements of the harmonic drives. This
method is based on the thin wall shells theory anal on the rotating
character of the distributed forces that work upon the flexible toothed
wheel.
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Causes Analyse of Breakages of Foundation Screws
Sinisa Kuzmanovic ,
Ruzica Trbojevic ,
Milan Rackov
The paper deals with problematic of gear units and machine foundating
and consequences that occur by foundation screws releasing. Namely,
reliable operating of gear units, as well as other stationary machines,
requires properly foundating. However, after certain period of time,
relaxation of screw material, selfuntightening of nuts and looseness of
foundation screws influence on reducing the force of preload screw
tightening and unequal load distribution. This unequal load distribution
causes unequal deformations, which generate occuring vibrations. In
extreme cases, breakages of screws and heavier accidents of systems
driven by that gear units or machines can happen. With this paper
authors want to indicate influence of deterioration degree on its load
capacity.
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Studies on the Executionof Models Used in Iron
Foundry From Epoxidic Resins
Cinca  Ionel Lupinca
The epoxidic resins are materials frequently used in the execution of
the models used in iron foundry. This materials can replace casily wood
or aluminium in the execution of the models needed in series
productions, having better resistance properties and the high
dimensional precision. The properties of these resins are obtained from
the completion of the epoxibifunctional molecules with supplements.
This paper establishes the result of mixing the two components, as well
as the supplements used to improve the mechanic and the
technological properties.
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Workspace of a Planar Robotic Guiding Device with
Parallel Topology of FP3+3×RTR+MP3 Type
Calin Miclosina
For a parallel topology robotic guiding device, the workspace frontier
can be determined by the topological analysis of its partial frontiers.
The principle of method is to determine the workspace of the
characteristic point P (referring to robot) on the basis of the
geometrical constraints imposed by every connexion introduced
between the two platforms (the fixed and the mobile one) and on the
basis of the geometrical constraints imposed by the platforms.
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On Asymptotic Behaviors for Linear SkewProduct
Semiflows in Banach Spaces
Andrea A. Minda ,
Mihaela A. Tomescu
In this paper we give several characterizations of some asymptotic behaviours:
stability, instability, dichotomy and trichotomy of linear skew
product semiflows in Banach spaces. The obtained results are generalizations
of some wellknown results on asymptotic behaviours of linear
differential equations. There are also presented several examples of
semiflows and linear skewproduct semiflows in Banach spaces.
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Perron Conditions for Stability of Linear Skew
Product Semiflows in Banach Spaces
Andrea A. Minda ,
Mihaela A. Tomescu
In this paper we give necessary and sufficient conditions for uniform
exponential stability of linear skewproduct semiflows in Banach
spaces. We give theorems of characterization for uniform exponential
stability of linear skewproduct semiflows in terms of boundedness of
some operators acting.
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Prerequisites of the Passage to a Regime of
Inflation Targeting
Mirela Minica
The article synthetically presents the main prerequisites of the
institutional and technical order we should consider in the context of
the National Bank’s adopting a complex policy of inflation targeting.
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Numerical Simulation with Finite Element Method of
the Plate with Concentrator
Dorian Nedelcu
The paper compares calculus made by Cosmos M Design Star software
with classical and statistical calculus for a plate with concentrator.
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Tensile Test Numerical Simulation with Finite
Element Method
Dorian Nedelcu
The paper compares calculus made by Cosmos M Design Star software
with classical tensile calculus, statistical values and with experimental
tensile test for standard tension test specimen.
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Some Aspects Concerning Convective Transfer of
Furnace Operations
Nadia Potoceanu ,
AdelaMaria Cornean
Majority of the process are convective, with turbulence. With establish
turbulence, the rate of heat transfer in various regions is so high that
may be regarded as infinite. The turbulent state of the main mass of
flow to which turbulent affects the thickness of the boundary layer is
specifying in this case, especially in tunnel furnace.
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The Modeling and Simulation of Brakingoff Voltage
at Hydro Generator Stator Winding Insulation
Mihaela Raduca
This paper presents the modeling and simulation of brakingof voltage
at hydro generator stator winding. The winding stator is supplied at
high voltage of 11 kV for high power hydro generator. The brakingof
voltage for stator winding is 40 kV.
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Investigation of Detection Circuits for Fast Level Detection
within a SDARS Diversity System
Eugen Raduca ,
Stefan Lindenmeier ,
Cornel Mituletu ,
Mihaela Raduca
In the paper is presented a proposal solution to use in the Diversity
System SDRAS for realized a fast detection of transmitted signal
through this system at reception.
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Synchronizing multiple DACs and ADCs for future
use in a 4x4 MIMO demonstrator
Eugen Raduca ,
Berthold Lankl ,
Sorin Jian ,
Mihaela Raduca
In this paper is presented a synchronized method used for the synchronizing
of DACs and ADSs. This method was used at synchronizing a
two DACs and two ADCs.
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Knowledge Management Framework Proposal –
Case Study “Babes Bolyai” University
Lucia Rusu
Based on production process in companies we developed a model of
knowledge management that can be implemented in our university.
This model is using organizational knowledge base of three entities: the
research engine, the production engine and the learning engine. We try
to identify several direct and indirect feedback from the production
process and research process linked with external demands and
internal university objectives. This model can be implemented on World
Wide Web and Internet technologies using collaborative model.
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The Analysis on the Bouys Used on the River for
Making a NonConventional Energetic System
Gheorghe Samoilescu
River buoys separate themselves from the maritime ones by their
special construction which provide them with a low draft and their
stability is calculated for waves of small height and short period. The
tail of these buoys is usually made out of one cylinder with a big
diameter. The river buoys are technically capable to ensure the
surveillance of the pass on special sectors, on sectors in which the level
of the water is fluctuating or nearby islands or ports.
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Electromagnetic Field Influence upon the
Electroenergetic System of the Ship
Gheorghe Samoilescu
It is presented a global evaluation criterion of the perturbation magnetic
field of a volume, which presents interest. It is determined the
medium volume density of the magnetic field energy in the interested
volume and correspond the medium value of the electromotive force
(e.m.f.) which is induced in a single winding. The medium value of the
e.m.f. is considered to be an evaluation criterion of the electromagnetic
compatibility.
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Mathematical Model and the Simulation of Electrical
Arc Welding as Moving Source in Protector Gas
Welding
Lenuta Suciu ,
Iancu Tatucu
The works presents the mathematical model of electrical arc welding,
simulation of the electrical arc as a moving source with help programs
software Ansys, passing through three stage of simulation: pre processing,
processing (solution) and postprocessing.
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Uncoupled Thermo  Mechanical for the Determination
of Welding Deformations
Lenuta Suciu ,
Iancu Tatucu
Simulation of the welding process for butt and tee joints using finite
element analyses are presented. The simulation are performed with the
commercial software Ansys, which includes mathematical model,
temperature dependent material properties, transfer and mechanical
analyses. One way thermo – mechanical coupling is assumed.
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On Simulation of Electromagnetic Devices with
Standard Coils
Iancu Tatucu ,
Lenuta Suciu
For many electromagnetic devices, the field coils may be considered as
being stranded, i.e. we may neglect the surface effect. We thus consider
such a coil with N turns (windings), the transversal section of one
turn Sc, the space factor s, supplied with electric voltage Ur. We
term Sb the sectional area of the coil, but many simulation software
programmes are conceived to admit only massive electric conductors
supplied in voltage. Consequently, it is imposed that a massive conductor
replaces the coil, with the same geometry as the coil and having the
cross section equal to Ss In order to ensure, that the electromagnetic
process takes place in a way similar to the case of the real coil, the
power supply of the conductor should be made with a reduced voltage.
The paper establishes the connection relation between these voltages
according to the parameter, which we desire to keep unchanged.
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Numerical Model for the Study of Electromagnetic
Processes in nonStationary Regime
Iancu Tatucu ,
Lenuta Suciu
The nonsteady (nonstationary) state of many electromagnetic processes
encountered in the industrial practice may be considered as
quasistationary, in the sense that in all conducting parts one may neglect
the capacitance current compared to the line current. The most
frequently used model for such a process is the mathematical model of
electromagnetic potentials.
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Nonuniform Exponential Stability and Instability of
Evolution Operators in Banach Spaces
Mihaela Tomescu ,
Andrea Minda
In this paper is presenting a parallel between nonuniform exponential
stability and nonuniform exponential instability of evolution operators in
Banach spaces, beginning to present the concept of the evolution
operator with nonuniform exponential decay, respectively growth, next
with the concept of the nonuniform stability, respectively instability,
nonuniform exponential stability, respectively instability, nonuniform
integrable stability, respectively instability and relationship between this
concepts.
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Nonuniform Exponential Dichotomy of Evolution
Operators in Banach Spaces
Mihaela Tomescu ,
Andrea Minda
The aim of this paper is to present notion of the nonuniform
exponential dichotomy of evolution operators in terms of nonuniform
integral exponential dichotomy.
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