Volume 4, No. 1 (2014)

TECHNOLOGICAL ROUTES FOR MANUFACTURED MICROWAVE PLANAR METAL –CERAMIC MICROPACKAGES

CORNEL ANTON

The paper comparatively presents planar micropackages for mounting microwave devices manufactured by two technological routes(the classical technology and the gold-gold diffusion method) , using technological processes specific to electronic microtechnologies. By using technological processes specific to electronic micro technologies (metallic thin film deposition, masking, photolithography photoresist mask etching) ceramic structures with a certain metallization configuration and an exceptional dimensional precision, dimensional tolerance being of the order of microns, are obtained. [1]

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SUR LA FIABILITE DES EOLIENNES

BĂJENESCU TITU

This review paper analyses the failure causes and phenomena of wind turbines, presents a comparison of France and Germany experience, pleads for component standardization, discuss their profitableness and reliability, and some of their advantages and disadvantages.

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SIMULАTION OF FLUID FLOW THROUGH А NETWORK OF STАTORIC BLАDES

BUZDUGĂ ŞT. ROXАNА, NEDELCU D. IULIАN

The study performs а simulаtion of the flow аround а network of stаtoric blаdes which highlights pressure аnd speed distribution аlong the flow. Theoreticаl vаlues cаn be compаred with the experimentаl vаlues, obtаined through lаborаtory testing on аn аerodynаmic model fitted with pressure intаkes.

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STRATEGIES POUR L'EVALUATION DE LA PURETE DES PICS DE CHROMATOGRAPHIE LIQUIDE DE SUBSTANCES DOPANTES

CULEA CĂTĂLINA MIHAELA

The evaluation of the purity of peaks is a key element in the development and validation of methods of doping tests indisputable. A sample of doping substances and impurities were used to study the applicability of the HPLC/MS. In chromatography’s conditions described in this paper, amphetamines are perfectly separated. Factors that affect the applicability of this approach to the purity of the peaks are also identified and analyzed.

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CONTROL SYSTEM FOR SHIP SOLAR TRACKER

CULEA GEORGE, CULEA CĂTĂLINA MIHAELA

This paper presents a solution for producing green energy using high concentration photovoltaics (HCPV) panels on large and medium sized ships. In order to have high efficiency HCPV modules are automatically oriented in the direction of the sun with dual axis trackers system. The solar tracker system for HCPV is designed to satisfy the conditions of the ship: oscillations and continuous displacement. This system can be used for the orientation a module or set of modules HCPV and is thus designed to be more efficiently. The control is provided by a PLC with a GPS module, analog input module for sensor connections and digital input/output modules for motors control. In order to realize orientation is calculated with precision the position of the sun using astronomical equations and information received from the GPS. Actual position of the panel is given by two sensors: a compass sensor gives angle toward the South Pole and a tilt sensor type ISU. The system is protected In case of damage and can be stopped temporarily if there is no sun or is strong wind, in which case it is taken out of the wind. Through this solution the solar tracker system for HCPV modules, it provides 25% -50% more energy than conventional panels.

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DIELECTRIC ANTENNA FED BY COAXIAL TO SUBSTRATE INTEGRATED WAVEGUIDE TRANSITION

IOANA GIANGU, VALENTIN BUICULESCU

A low-cost antenna has been designed and tested forRFID related applications, considering radiation into free space or close proximity of large ground planes. The antenna is fed by broadband transition from coaxial connectors to a substrate integrated waveguide(SIW). A rod type element is used for signal radiation. Radiation patterns are compared for both normal ground planes, i.e. the wide SIW walls, and extended ground plane, similar to the antenna placed upon conductive wide areas. The antenna is manufactured on standard FR-4 dielectric material, using regular printed circuit board technology.

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SOME ASPECTS ABOUT LOW ENERGY BUILDINGS

GRIGORE ROXANA

The paper attempts to present a project of a low energy house which uses renewable energy to cover the heating and domestic hot water needs. The heat demand of the house for the winter and domestic hot water needs are calculated. The global coefficient of thermal insulation and energy consumption for heating and domestic hot water are computed, too. The calculation methods are those recommended by the current Romanian regulations. The obtained values are very small and the house can be seen as a low energy building.

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CONSIDERATIONS ABOUT THE INFLUENCE OF THE THERMAL INSULATION LAYER ON THE ENERGY PERFORMANCE OF A BUILDING

GRIGORE ROXANA

The paper highlights the influence of thermal insulation layer applied on exterior walls of the building on its energy efficiency performance. Expanded polystyrene, the most common used material in Romania, at present, for the thermal rehabilitation of buildings, was chosen as thermal insulation material. There are considered five different cases depending on the thickness of polystyrene applied on the exterior walls of the building and the global coefficient of thermal insulation, the thermal resistance of entire envelope and the heat loss through transmission are calculated.

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CONTROL WITH MICROCONTROLLER A MOTOR ASYNCHRONOUS THREE-PHASE SQUIRREL CAGE

LIVINTI PETRU

This paper presents a control system of a microcontroller MC3PHAC phase induction motor rotor cage. Asynchronous motor power is achieved through a static frequency converter. It consists of a rectifier circuit, a filter and a three-phase inverter power transistors made with IGBT type. Phase inverter is controlled using microcontroller preprogrammed MC3PHAC generates six PWM signals for controlling the power switches of the inverter. The system was designed and developed practical laboratory electric car in the Faculty of Engineering of Bacau. Commissioning and tests conducted have given good results.

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THE ELECTROMAGNETISM IN THE THEORY OF A SPECIAL INGARDEN MECHANICAL SYSTEMS

OTILIA LUNGU, VALER NIMINET

In this paper we study the electromagnetism of a particular case of Finslerian Machanical system, called Special Ingarden Mechanical System, endowed with a special nonlinear connection. Also we determine h- and v- torsion and the the local coefficients of the canonical metrical d-connection .

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STUDY CASE OF A HYBRID WIND-PHOTOVOLTAIC SYSTEM BASED ON HOMER SIMULATION

NICHITA CRISTIAN, LIVINTI PETRU, ENACHE PAUL

This paper presents a study case made in the laboratory GREAH of the University of Le Havre; it concerns an installed small hybrid power system composed by two vertical-axis wind turbines and 27 solar panels grid connected. We simulate this system using Homer environment. The simulation can be used for comparison with the data of the real system also in order to find solutions to enhance his efficiency by adding solar panels and other wind resources.

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THE ENERGY OF A SPECIAL LAGRANGIAN MECHANICAL SYSTEMS

VALER NIMINEŢ, OTILIA LUNGU

In this paper we consider a special sort of Lagrangian mechanical system holding external forces. This study aims in finding the evolution of dissipativity and the energy of this Lagrangian mechanical system.

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INCORPORATING RESEARCH INTO THE UNDERGRADUATE CURRICULUM IN ENGINEERING AND ENGINEERING TECHNOLOGY-(E/ET) LESSONS LEARNED

CYRIL OKHIO PH.D., C.ENG., FLORIAN MISOC PH.D., P.E., AUSTIN ASGILL, PH.D., P.E., M.B.A.

Undergraduate research has been found to provide an essential component of engineering and engineering technology education and therefore belongs in the undergraduate curriculum. It has a positive effect on individual research programs and the university's research enterprise. It contributes to the intellectual life of individual departments and the campus as a whole, while it raises the level of research activity, and helps recruit stronger undergraduates, graduate students, and faculty. This paper analyzes the student learning outcomes, for Engineering and Engineering Technology (E&ET) programs, where the curriculum has been tailored to include undergraduate research, as compared to lecture & lab-based curriculum.

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RESEARCH ON AIR QUALITY ANALYSIS WITH PORTABLE DEVICES

POPA SORIN EUGEN

This paper presents a device and an application that allows the measurement and calculation of existing hazardous gases into the surrounding atmosphere. The assessment is built around the Arduino platform that has connected a gas sensor MQ2-2 and other auxiliary circuits. Device, as it was conceived and realized, can detect and measure the following chemical components in ambient air: LPG, carbon monoxide and smoke.

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ENERGY CONSUMPTION FORECAST FOR A GIVEN DAY OF THE YEAR WITH NEURAL NETWORK

PRUTEANU EUSEBIU, BUZDUGĂ ŞT.ROXANA

Purpose of the work is to use IA (artificial intelligence) and ANN - artificial neural networks (relatively new field of research, looking for in the data set input a certain "model", unknown and which cannot be described by a mathematical function, tend to take the form process, run identical, thus managing to generate an output very close to desired) in energy who carries out value forecast energy used in a specific time/day/period in a year.

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THE STUDY REGARDING THE REAL TIME SOFTWARE MANAGEMENT, OF A WIND TURBINES GROUP IN A SCADA INTERFACE

PETRU GABRIEL PUIU

The paper work aims to design a SCADA system for operation analysis of a wind turbines group for insulate consumers.

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CONFIGURABLE SYSTEM FOR THE SENSORS NETWORK

ROTAR DAN, ANDRIOAIA DRAGOS

This paper shows how to achieve a flexible embedded system. The system shown comprises two soft-core processors for the signal processing provided from a sensor array. Electronic structure is programmed on a programmable logic array. The two microcontrollers are programmed in C ++. Such a structure has a high flexibility because the designer can adjust the physical structure of the program as necessary. It can also achieve a balance between the two components of the embedded system. In this way one can achieve an optimal performance of the system.

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CONFOCAL SPHEROIDAL CAPACITORS: ANALYTICAL VERSUS BOUNDARY INTEGRAL EQUATION CALCULATIONS OF THEIR CAPACITANCE

TITUS SANDU

The capacitance of a conductor has a boundary integral equation formula as the product of the embedding medium dielectric permittivity, the area of the conductor, and the inverse of the squared norm of a given Eigen function of the Neumann-Poincaré operator. The result leads to a class of capacitors in which the outer electrode has the shape of an equipotential surface generated by the equilibrium charge of the inner electrode. We show that co focal spheroid capacitors belong to this class. The thin capacitors of the same class have a planar-like capacitor formula that may be used to estimate the membrane capacitance in living cells.

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