| ID |
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Rezumatul articolului |
1. |
DETERMINING THE HEAT REGIME IN THE
WORKING OF A COUPLING WITH SLIDING MOTION |
Ivona PETRE |
Valahia University Targoviste |
petreivonacamelia
@yahoo.com |
Abstract. Following the sliding
motion between two surfaces a heat release occures which leads to
a changing of the mechanical properties of the surfaces in contact.
Amongst the factors that influence the heat release one may name
the loading, the velocity, the surface topography, the surface material,
the lubrication and last but not the least, the environment.
The present paper proposes a computation model to determine the
temperature in the working of a coupling to which the mechanical
characteristics of the materials are not affected by changes which,
at their turn, lead to undesired effects.
|
2. |
STRENGHT ANALYSIS AND VERIFICATION
DESIGN FOR CASING HANGER BASED ON ANSYS |
Gheorghita TOMESCU1, Iuliana IASNICU
(STAMATE) 2, CarmenPOPA 3 |
1 SC UPET SA Targoviste, 2 Technical
College Gheorghe Asachi, Bucuresti, 3 VALAHIA University Targoviste
|
tomescu.gb
@gmail.com |
Abstract. In during drilling
of a well, the column of casing is suspended in the wellhead through
the casing hanger. Their dimensioning is analytically done, considering
the maximum weight of the column of casing. Design loads according
to API 6A indicated, are weight column and also the pressure in
the system. The loads to which the casing will be exposed during
the life of the well will depend on the operations to be conducted.
Casing suspending on casing hanger will result in radial (burst
and collapse) and axial (tensile and compressive) loads on the casing
strings. In this article we studied with finite element analysis
(ANSYS), the influence of pressure on the casing resistance suspended
on the 9 5/8 " casing hanger for three slip lengths ( 170 -resulting
from analytical calculation, 120 and 220 mm ). Keywords: casing
hanger, Finite Element Analysis, ANSYS |
3. |
DETERMINATION OF OVERALL HEAT TRANSFER COEFFICIENT
BY SIMPLE THERMAL ANALYZE |
Mirela POPESCU (DRAGOIU), BelaVARGA, Tibor BEDO |
Universitatea Transilvania
Brasov |
mireladragoiu1
@yahoo.com |
Abstract. To know more precise
the value of overall heat transfer coefficient is on a special importance
to programs (software) that models the solidification process for
project casting technology in order to optimize them by dimensioning
and appropriate placement both the gating system and the risers
for eliminate casting defects, shrinkages. The paper aims to determin
the value of overall heat transfer coefficient on the cooling curve
recorded in casting-solidification real conditions. The values obtained
for the overall heat transfer coefficient (2.34 to 25.41) ·
10-4 [cal/s.grad.cm2]) for different casting conditions prove that
this parameter can not be considered as a constant of the casting
mould material. |
4. |
DYNAMIC STUDY OF AN ELASTIC SYSTEM WITH TWO
DEGREES OF FREEDOM |
Vladimir Dragos TATARU |
VALAHIA University Targoviste |
vdtataru
@gmail.com |
Abstract. In the paper is
presented the dynamic survey of an elastic mechanical system which
consists of two rigid solids linked each other by a cylindrical
joint. One of the two rigid solids is linked through a linear elastic
spring by another rigid solid which is supposed to be fixed. We
propose ourselves to study the movement of this elastic mechanical
system under the action of forces. In order to do this in the paper
is presented a numerical method which suppose writing the differential
equations of motion under a matrix form. Finally it is elaborated
a computing program with the aid of which the differential equations
of motion are integrated using numerical integration methods. In
this way is determined the variation with respect to time of the
kinematical parameters of the rigid solids which make up the elastic
mechanical system. |
5. |
INCREMENTAL NUMERICAL METHOD USED FOR THE KINEMATIC
ANALYSIS OF THE FOUR BAR LINKAGE MECHANISM |
Vladimir Dragos TATARU |
VALAHIA University Targoviste |
vdtataru
@gmail.com |
Abstract. Kinematics deals
with the study of geometric aspects of the movement without taking
into consideration the mass of the rigid solids (their inertia)
and neither the causes that provoked the movement namely the forces.
The present paper presents a comparative kinematical study of the
articulated quadrilateral mechanism. More precisely, in this paper
is presented an incremental numerical method for kinematics analysis
of the articulated quadrilateral mechanism (four bars linkage mechanism).
Further on, the kinematical analysis of the same mechanism is effectuated
using an analytical method. Finally the results obtained by the
two methods are compared. |
6. |
STUDY OF THE INFLUENCE OF GRAIN SIZE ON THE
TOTAL MAGNETIC LOSSES IN SILICON STEEL |
Elena Valentina STOIAN, Maria Cristiana ENESCU,
Vasile BRATU |
VALAHIA University Targoviste |
elenastoian22
@gmail.com |
Abstract. The purpose of this
work was to study microstructural changes of the bands investigated
during processing occurring siliceous strips with non-oriented grains
, and the study the influence of grain size on the total magnetic
losses at 1.0T and 1.5 T. There have been studies 10 rolls intended
to be processed into quality electrical steel M400-50A (according
to EN 100027-1 ) rolls who underwent conventional lamination technology.For
the 10 rolls were made measurements of magnetic characteristics
, at the induction J = 1 500 mT and at a frequency f = 50 Hz and
after that, we made correlations between the specific losses, and
grain size. |
7. |
THE STABILITY OF LONGITUDINAL MOVEMENT DURING
THE TRANSPORTATION OF INDUSTRIAL OVERSIZED EQUIPMENT ON A PLATFORM
WITH AN EVEN NUMBER OF AXLES. GENERAL CASE |
Radu I. IATAN 1, Mihai STATESCU 2, Cristina SALCA
1 |
1 University POLITEHNICA of Bucharest; 2 Walter
Tosto WTB Bucharest |
r_iatan
@yahoo.com |
Abstract. It is known that the transportation
of oversized technological equipment raises particular problems,
both from the economical and technicall point of view. Knowing
the loads in the plaform-equipment assembly, the intensity and
the direction of the wind loads, the condition of roads and the
way these act is imperative. The present paper seeks to determine
the expression of the loads obtained on a platform with an even
number of axles, loaded with a technological equipment and neglecting
or not the deformation of the suspensions and tires.
|
8. |
STRUCTURE OF EN AC 5083 ALUMINIUM ALLOY DEPENDING
ON THE COOLING CONDITIONS |
Mirela DRAGOIU,
Bela VARGA |
Universitatea Transilvania
Brasov |
mireladragoiu1
@yahoo.com |
Abstract. In this paper it
was studied the structure of of EN AC 5083 aluminium alloy depending
on the conditions cooling. By cooling curves recorded for different
casting conditions there was calculated the cooling rate (vr). Structural
analyzes were performed using software Image Pro-Plus 6.0 allowed
both be highlighted the structural particularities of various conditions
for casting and establishing the correlation: lg v = d + n (where
d is the dendritic parameter). |
9. |
USING THE TMC428 - INTELLIGENT STEPPER MOTOR
CONTROLLER IN ADAPTRONIC DRIVER CIRCUITS FOR THE WALKING REHABILITATION
SYSTEMS |
Anghel CONSTANTIN |
Doctoral School of Valahia University Targoviste |
anghel.constantin
@incdmtm.ro |
Abstract. One of the most
important factors that influence a persons quality of life is walking
ability. The actual rehabilitation therapies for locomotor disabled
persons use mechatronic or robotic systems. Most of them use various
devices such as treadmills. The treadmills basic systems is compose
for intelligent stepper motors controller for driving and command.
The paper is concerned with examination to main parameters and the
problems about the intelligent command controller for this aim.
|
10. |
MEMS AND NEMS INTELLIGENT ADAPTRONICS TECHNOLOGIES
AND EQUIPMENTS USED FOR ECOLOGICAL AGRICULTURE TO IMPROVE PERFORMANCE
AND QUALITY OF AGRICULTURAL PRODUCTS |
Iulian ILIE |
Doctoral School of Valahia University Targoviste |
iuliancefin
@yahoo.com |
Abstract. MEMS and NEMS Intelligent
adaptronics technologies and equipments is the future of technologies
used in most areas, especially because of the tendency to miniaturization
of equipment, but also the tendency to use new technologies and
equipment for new activities. Integration into new equipments and
advanced technologies of adaptronics, as scientific and technological
strategy and multi-interintegrator strategy is used as a vanguard
of opening new possibilities for the design, construction and implementation
of innovative products and adaptronics systems. Currently, organic
farming and its specific activities, such as soil testing and arable
land can be improved, especially by using special drones and specific
areas of interest. They are involved in a large variety of applications
and they become equipments that can be adapted to the requirements
of ecological agriculture and used in the testing and monitoring
of soil and arable land. |
11. |
CHARACTERIZATION OF SILICONE RUBBER REINFORCED
WITH MAGNETIC FILLERS |
Elena Valentina STOIAN |
Valahia University Targoviste |
elenastoian22
@gmail.com |
Abstract. In this work silicone
rubbers is reinforced with magnetic fillers (iron silicon). The
obtaining of composite materials was with the aid of a doctor blade
technique. Doctor blade technique is a coating technique widely
used for producing thin films on large area surfaces. The tehnique
to introducing the particulate in the polymeric matrix is a simple
technology and ecological without environmental impact , contributing
to environmental conservation. Recently, there has been considerable
interest in forming filler as a means to improve several properties
of elastomers. This paper presents results of researches on processing,
characterization and behavior of composite materials based on silicone
rubber. The samples were processed in the laboratory using a plated
nettling (PN), that was impregnated with a silicone rubber based
composite containing iron silicon (SI). Measurement of the both
parts of the materials obtaining, have shown an electromagnetic
shielding effectiveness of the order of 3,35-41,62 dB (white face)
and 3,53-41,42 dB (gray face), in the 1-18 GHz frequency range according
to SR EN 50 147-1:1999. |
12. |
MICRO-SISTEM CYBER- MIXMECHATRONIC ADAPTRONIC
ULTRAPRECIS SI DE TELECONTROL INTELIGENT 3D MULTIAPLICATIV SI TELEMONITORIZAT
IN MEDII INDUSTRIALE SI SOCIETALE CYBER-MIXMECHATRON SYS 3D |
Gheorghe Ion GHEORGHE |
INCDMTM Bucharest |
geocefin
@yahoo.com |
Abstract. Lucrarea stiintifica
prezinta Noul Concept Cyber- MixMechatronic Adaptronic de Telecontrol
Inteligent 3D Multiplicativ si Telemonitorizat in constructii de
Micro-Sisteme Integrate aferente mediilor industriale si societate,
pentru indeplinirea mai multor functii specifice sistemului integronic-
sistem fizic (mecatronic si adaptronic) in fuziune cu sistemul virtual
(Internet si Intranet). |
13. |
NOISE REDUCTION PRODUCED BY SOUND SOURCES USING
COMPOSITE CONSTRUCTION SOLUTION |
Iuliana IASNICU (STAMATE)1, Gheorghita TOMESCU
2, Ovidiu VASILE 3, Radu I. IATAN 3 |
1 Colegiul Tehnic Gheorghe Asachi, Bucuresti
, 2 SC UPET SA Targoviste, 3 Universitatea Politehnica Bucuresti |
yulyanastamate
@yahoo.com |
Abstract. In the study of
composite materials there is highlighted the interest in using recycled
materials. It studies the contribution that can have recycled textiles
and other materials that can be merged to form a layered composite
can be used for sound insulation or noise sources encapsulation.
It is often mentioned the important role of various types of fiber
insertions, for which reason their impact was monitored, both for
textile fibers - bamboo, jute and for other types of fibers, for
example wood fiber or tea ones. The composite materials to be made
are intended to be used as materials to carry out the proofing of
noise sources; references to this area of interest are to be found
in works. Studying textile plates recovered and polyethylene plates
in order subsequently to achieve the layered composite materials
containing these plates. Study of plates is made from the point
on influence of the thickness of the material used to encapsulation
on sound-absorbing properties. |
14. |
CAD-CAM-CAE INTEGRATION IN RAPID PROTOTYPING
FOR 3D PRINTING OBJECTS THROUGH SELECTIVE LASER SINTERING TECHNOLOGIES |
Nastase-Dan CIOBOTA, Gheorghe Ion GHEORGHE |
INCDMTM Bucharest |
dan_ciobota
@yahoo.com |
Abstract. This paper will
deal with some aspects regarding integration of various computer
aided software engineering, design and manufacturing concepts for
better new products development. From design to manufacturing, the
new trends in mechatronics focus on faster obtained, better and
cheaper new products, aiming to bring the rapid prototyping technologies
as a driving force in the new era of manufacturing |
15. |
STUDIES ON QUALITY COATINGS WITH ZINC OF STEEL
LAMINATES |
Aurora Anca POINESCU, Simona. MIHAI |
Valahia University Targoviste |
poinescua
@yahoo.com |
Abstract. Zinc coating steel
sheet and strip, currently is a widespread technology and aims to
protect the steel from corrosion by adding a metallic layer of zinc.
Hot dip galvanizing of steel to progress on product quality in line
with market requirements. Despite this progress can not completely
avoid defects on galvanized sheets due to the multiple defects that
are different and sometimes influenced by earlier processes (design,
lamination). This paper aims to identify factors that influence
the quality of the zinc layer that determines the cause of defects.
|
16. |
EVALUAREA STRUCTURALA SI COMPOZITIONALA A UNOR
STICLE FOSFOCALCICE CU POTENTIAL BIOACTIV |
Daniela AVRAM, Dan Nicolae UNGUREANU, Nicolae
ANGELESCU |
Valahia University Targoviste |
avramdana75
@yahoo.com |
Abstract. In acesta lucrare
sunt prezenate rezultatele experimentale a doua sticle fosfocalice
de compozitie: 50%SiO2-45%CaO-5%P2O5 si 47%SiO2-45%CaO-5%P2O5-3%Ag2O
obtinute prin metoda sol-gel. In vederea studiului bioactivitatii
cele doua compozitii au fost analizate din punct de vedere structural
prin analiza de difractie cu raze X. In acest caz a fost pus in
evidenta formarea apatitei dupa un interval de 14 zile de imersare
in lichid uman simulant, dar si a altor compusi rezultati in urma
aceluiasi proces. Gruparile functionale prezente in structura celor
doua sticle inainte si dupa imsersare au fost evidentiate prin analiza
de spectroscopie in infrarosu cu transformata Fourier (FTIR). Compozitia
chimica elementala a fost confirmata prin analiza WD-XRF, iar dimensiunea
particulelor si stabilitatea celor doua probe a fost analizata prin
difuzia dinamica a luminii (DLS), analiza termogravimetrica (TG)
si prin calorimetrie diferentiala cu baleiaj (DSC). Sticla dopata
cu argint a fost evaluata din punct de vedere microbiologic prin
utilizarea a doua tulpini de bacterii frecvent implicate in infectiile
nosocomiale. |
17. |
SIMULAREA DEFORMATIILOR UNEI BARE ÎNCASTRATA
LA UN CAPAT SI REZEMATA ELASTIC LA CELALALT CAPAT, SOLICITATA LA
ÎNCOVOIERE SI COMPRESIUNE ÎN FUNCTIE DE POZITIA FORTEI
TRANSVERSALE PE BARA |
Cornel MARIN |
Valahia University Targoviste |
marin_cor
@yahoo.com |
Abstract. Studiul stabilitatii
elastice a barelor supuse la compresiune si încovoiere reprezinta
un capitol important în calculul de verificare si dimensionare
al elementelor de tip coloana. Prezenta lucrare are ca scop calculul
fortei critice de flambaj si simularea unei bare supusa la încovoiere
si compresiune folosind atât metoda de calcul de ordinul I
(ce nu ia în calcul efectul fortei de compresiune), cât
si metoda de calcul de ordinul al II lea (ce ia în calcul
efectul fortei nu de compresiune). De asemenea, lucrare are ca scop
prezentarea unei metode originale de simulare prin reprezentarea
grafica a variatiei eforturilor încovoietoare, sagetilor si
rotirilor pentru diferite cazuri particulare de solicitare la încovoiere-compresiune
a barei drepte cu o forta transversala Q actionând la distanta
aLde încastrare în functie de parametrul a si la compresiune
cu o forta axiala comparabila cu forta critica de flambaj, folosind
programul de calcul profesional MATHCAD14. Desigur, folosirea aceastei
metode de simulare are numeroase aplicatii ingineresti în
domeniul constructiilor de masini, echipamentelor, instalatiilor,
utilajelor, constructiilor civile si industriale. |
18. |
DIAGNOZA VIBROACUSTICA SI REZULTATE EXPERIMENTALE
PRIVIND MENTENANTA UNOR ECHIPAMENTE AFLATE ÎN EXPLOATARE |
Ionel RUSA1 , Cornel MARIN2 |
1 Doctoral School of Valahia University Targoviste,
2 Valahia University Targoviste |
marin_cor
@yahoo.com |
Abstract. In practica inginereasca,
cunoasterea starii tehnice ale echipamentelor aflate in functionare,
scurtarea duratelor de reparatie a utilajelor, planificarea inteligenta
a reparatiilor in functie de evolutia uzurii in timp a organelor
de masini aflate in miscare, identificarea si remedierea unor erori
de montaj sau reparatie sunt cateva din obiectivele importante pe
care inginerul de exploatare trebuie sa le urmareasca pentru evitarea
distrugerii echipamentelor si scoaterea lor definitiva din exploatare
si pentru asigurarea unor costuri de reparatii cat mai mici. Scopul
acestei lucrari este de a prezenta un studiu de caz privind diagnoza
vibroacustica a unor echipamente si componente supuse la uzura in
timpul functionarii in scopul prevenirii defectarii lor catastrofale,
precum si a pierderilor umane si materiale. |
19. |
LEAN MANUFACTURING TOOLS |
Ana GAVRILUTA |
University of Pitesti |
ana_c_gavriluta
@yahoo.com |
Abstract. In the present moment
the LEAN MANUFACTURING concept has evolved greatly, developing in
the big enterprises, to increase the quality of products, decrease
the Lead Time, to improve the working conditions from ergonomic
point of view and to ease the production process. Based on the need
to reduce increase the production and to reduce the non- added value
activities, a study was made, that uses LEAN manufacturing tools
to describe and to analyze the production system. With the help
of SIPOC analysis were identified the main actors of the production
system. The LEAN manufacturing questionnaire and the VSM were used
to identify the problems along the flow, from its beginning (supply
of row material) and to its end (delivery of finished products).
This type of study is recommended to any enterprise, because helps
to find and implement new solutions that have as porpoise production
flow improvement. |
20. |
ESTIMATES OF UNCERTAINTIES BUDGET AT SDAR-OES
TECHNIQUE FORCHEMICAL CONFORMITY ASSESSMENT |
Florina Violeta ANGHELINA |
Valahia University Targoviste |
vianghelina
@yahoo.com |
Abstract. In this paper will
be presented data about critical aspects of chemical conformity
evaluation and some information on uncertainty budget of SDAR-OES
technique.The practice of conformity assessment is in complies with
ccurrent concepts of quality assurance and risk mitigation of products
exploitation in the medical applications.Spark discharge in argon
optical emission spectrometry (SDAR-OES) is the most used technique
for elemental analysis of metallic alloys due to its highest efficiency
ratio. The working principle of SDAR-OES analysis is the measurement
of intensity of characteristic spectral lines emitted by atoms during
sparking.The spectrochemical test plays a very important or even
decisive role in the development of most industrial alloys which
have a known chemical composition.The improving of the spectrochemical
test quality it is important for ensuring conformity composition
requires by uncertainty budget evaluation of sparking electrical
discharge. |
|
21. |
STIMAREA INTENSITATII INTEGRALE A LINIEI DE
DIFRACTIE |
Florina Violeta ANGHELINA, Ileana Nicoleta POPESCU,
Elena Valentina STOIAN |
Valahia University Targoviste |
vianghelina
@yahoo.com |
Abstract. In cadrul metodelor
de investigareprin difractie de raze X, factorii care determina
atat intensitatea maxima a liniei, (pick-ului), de difractie cat
si intensitatea integrala a liniei de difractie, sunt: factorul
atomic (f) factorul Debye Waller (e-2M),
factorul de polarizare, factorul de structura(FH2),
factorul Lorentz (L( θ)) si factorul de absorbtie sau factor
de patrundere (A). Acest set de factori mentionati anterior trebuie
completat cu inca trei factori, dintre care doi factori nu pot fi
tratati in cadrul teoriei cinematice a difractiei radiatiei X. Acesti
doi factori sunt:
• C- corectia datorata imprastierii anomale.
• ζ-corectia sau coeficientul de extinctie datorat interferentei
fasciculelor difractate, atat intre ele cat si cu fasciculul primar.
Studiul acestor fenomene si efectele lor asupra intensitatii integrale
fac obiectul acestei lucrari.
|
22. |
STUDIUL COMPARATIV ASUPRA PROPIETATILOR MECANICE
A CONDUCTELOR DIN POLIPROPILENA |
Maria Cristiana Enescu,
Alexis Negrea,
Elena Valentina Stoian,
Gabriel Constantina
|
Valahia University Targoviste |
cristiana_enescu
@yahoo.com |
Abstract. Tevile PPR au devenit
din ce în ce mai populare în ceea ce priveste instalatiile
de apa potabila si încalzire. Comparativ cu tevile clasice
din cupru sau otel, cele din polipropilena sunt mult mai usor de
utilizat, au calitati indiscutabile si sunt comercializate la un
pret mult mai mic. Studiu îsi propune analiza comparativa
a proprietatilor fizico – chimice a celor trei tipuri de tevi
PPR care se gasesc în comert: simple (fara insertie), cu insertie
de fibra compozita si cu insertie de aluminiu.
De asemenea lucrarea prezinta si o simulare a acestor proprietati
realizata utilizând un program de analiza cu element finit
Cosmos Works si programul de modelare SolidWorks.
|
23. |
ASPECTE PRIVIND FENOMENELE DE UZURA PRIN OXIDARE
A ARMELOR DE FOC |
Ivona Petre,
Maria Cristiana Enescu, Elena Valentina Stoian
|
Valahia University Targoviste |
cristiana_enescu
@yahoo.com |
Abstract. Lucrarea îsi
propune sa analizeze comportamentul suprafetei interioare a tevilor
de armamanet pe timpul exploatarii. Întrucât interiorul
acestora este supus unor solicitari complexe vom analiza aparitiei
diferitelor tipuri de uzura precum si modalitati de prevenire a
acestora.
Solicitarile multiple care actioneaza simultan conduc la distrugerea
tevii prin coroziune. Fenomenul de uzura prin oxidare a fost studiat
prin utilizarea modelului Quinn care coreleaza actiunea diferitilor
parametri asupra intensitatii de uzare prin oxidare.
|
24. |
UNELE REZULTATE EXPERIMENTALE PRIVIND MENTENANTA
POZITIVA A UNOR ECHIPAMENTE AFLATE IN EXPLOATARE |
Ionel RUSA1 , Cornel MARIN2 |
1 Doctoral School of Valahia University Targoviste, 2 Valahia University
Targoviste |
marin_cor
@yahoo.com |
Abstract. Scopul acestei lucrari
este de a prezenta un studiu de caz privind diagnoza vibroacustica
si mentenanta pozitiva a unor echipamente si componente supuse la
uzura în timpul functionarii, în scopul prevenirii defectarii
în timpul functoinarii initiale (rodajului), precum si a pierderilor
umane si materiale datorate acestor defectari. |
25. |
BIOMATERIALE OBTINUTE PRIN METALURGIA PULBERILOR |
Ileana Nicoleta POPESCU, Florina Violeta ANGHELINA,
Mihaita Nicolae ARDELEANU |
Valahia University Targoviste |
pinicoleta24
@yahoo.com |
Abstract. In ultimii ani,
tot mai multe cercetari s-au axat in realizarea prin diferite tehnici
de noi materiale biocompatibile sau materiale biodegradabile utilizate
ca implanturi medicale permanente sau temporare în chirurgia
reconstructiva. Avantajele obtinerii prin tehnica metalurgiei pulberilor
(MP) a implanturilor biomedicale sunt (i) obtinerea de forme complexe,
(ii) de materiale cu porozitate controlata sau (iii) realizarea
de materiale sinterizate metalice rezistente din punct de vedere
mecanic, utilizate ca elemente de armare pentru materialele ceramice/polimerice
biocompatibile. In aceasta lucrare sunt prezentate atat cele mai
utilizate biomateriale obtinute prin MP cat si cele mai noi astfel
de biomateriale, metodele de obtinere prin MP a acestora si proprietatile
biomaterialelor studiate in corelatie cu domeniul biomedical de
aplicabilitate. |
26. |
ANALIZA STASTISTICA A COMPORTARII LA COROZIUNE
A OTELURILOR PENTRU TEVI DE TIP OLT 35, OLT45 SI OLT 65 |
Ileana Nicoleta POPESCU , Carmen Otilia RUSANESCU,
Maria-Crisiana ENESCU |
Valahia University Targoviste |
pinicoleta24
@yahoo.com |
Abstract. La transportarea
produselor petroliere se utilizeaza conducte subterane realizate
din tevi de otel de tip OLT 35, OLT 45 si OLT65. O problema ce apare
în exploatarea acestor tevi este coroziunea acestora si ca
urmare este important sa se determine viteza de coroziune, potentialul
minim de protectie catodica a otelului cat si potentialul de coroziune
al otelului in conditiile date, fata de electrodul de calomel saturat
(ECS). Cunoscându-se produsul de coroziune, pH-ul solului
în care este îngropata conducta si viteza de coroziune
admisibila, în aceasta lucrare s-au determinat parametrii
mai sus mentionati, iar la prelucrarea si interpretarea datelor
experimentale s-a utilizat statistica matematica. |
27. |
SENSITIVE EQUIPMENTS VIBRATION ANALISYS ON FLOORS
FROM INDUCED FOOTFALLS |
Mihai ZDRAFCU, Cornel MARIN |
Valahia University Targoviste |
marin_cor
@yahoo.com |
Abstract. Many tipes of precision
equipment, such as equipment used in optical measurements , nanotechnology,
electron beams, require low levels of ground vibration for proper
use. Vibrations from footfall, vehicle pass-by on exterior, or even
air pressure can all induce vibrations in the building’s structure.
In these precision applications the smallest ground-borne vibrations
may cause errors and be costly. Typical measurements are compared
to tolerance limits defined by standards including BBN curves, IEST
VC curves, and ASHRAE curves. These curves are a series of curves
that range in strictness based on the equipment type from surgical
suites on the low end to nanotechnology applications on the high
end. The comparison measurements are often done in frequency spectra
based of velocity data. In doing such low level analysis, it is
important to select proper measurement equipment with enough resolution
to be able to accurately record low level signals and precise software
to calibrate ,process and compare the information.
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28. |
PROIECTAREA, MODELAREA SI SIMULAREA CURGERII
GAZELOR DE LUCRU PRIN CANALE CONFIGURATE PE SUPRAFATA PLACII BIPOLARE
A UNEI PILE DE COMBUSTIE PEM |
Alexis NEGREA |
Valahia University Targoviste |
alexis.negrea
@yahoo.com |
Abstract. Proiectarea placii
bipolare trebuie sa tina cont de rolul functional acesteia în
celula de baza a pilei de combustie si implicit de rolul functional
în pachetul de celule. Constructia si geometria suprafetelor
active, de etansare, de alimentare si de fixare are legatura directa
cu procesele electrochimice care au loc în celula, cu modul
de alimentare si distributie cu gaze de lucru si a apei de racire.
Alegerea unor solutii constructive pentru alimentarea si distributia
gazelor pe suprafata activa a placii bipolare influenteaza puternic
performanta celulei de baza. Racirea zonei active este de asemenea
importanta în obtinerea unor performante bune. Simularea curgerii
gazelor de lucru (H2 si O2) cu modulul Flow Simulation din SolidWorks
înlesneste proiectarea optima a canalelor de curgere. |
29. |
CONDUCTIVE ALUMINA-ADDED ZNO CERAMIC TARGET
PREPARED BY SINTERING FOR TRANSPARENT CONDUCTIVE THIN FILMS OBTAINED
BY MAGNETRON SPUTTERING |
Iulian IORDACHE 1,2, M. MARINESCU 1, Zorica
BACINSCHI 2 |
1 ICPE-CA Bucharest, 2 Valahia University Targoviste |
iordache.icpeca
@gmail.com |
Abstract. This study investigates
the possibility to prepare highly conductive ceramic AZO targets,
using sintering of Al2O3 dopped ZnO powders obtained by several
route to obtain suitable sputtering targets for depositing transparent
conducting Al-doped ZnO (AZO) films by using RF magnetron sputtering.
Physical properties of ceramic materials were evaluated. AZO transparent
conductive layers characterized by spectrophotometry in the visible
range (380-780) nm showed a transmittance of 75% to 91%. AZO layer
thickness was determined by scanning electron microscopy ina sectional
tilt mode. The surface resistance of AZO layers was foiund to be
(600-100) Ω/ sq for a thickness ranging from (100-1000) nm.
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30. |
CONSIDERATII ASUPRA DIFICULTATILOR DE ESTIMARE
A PUNCTELOR CRITICE PRIN ANALIZA DILATOMETRICA |
Adrian CATANGIU, Dan Nicolae UNGUREANU |
Valahia University Targoviste |
acatangiu
@yahoo.co.uk |
Abstract. Determinarea cu
precizie a punctelor critice ale otelurilor este o conditie de baza
pentru aplicarea cu succes a tratamentelor termice. Informatiile
furnizate de curba de dilatare liniara a materialului nu conduc
intotdeauna la rezultate concludente, datorita unor factori ce tin
pe de o parte de material (starea structurala, morfologia constituentilor)
iar pe de alta parte de limitarile instrumentului de masura (liniaritatea
traductoarelor de masurare a temperaturii si dilatarii respectiv,
viteza de incalzire aplicata). Analiza curbelor dilatometrice ale
unui otel hipoeutectoid evidentiaza diferente de alura pentru stari
structurale diferite (morfologii diferite ale perlitei) si faptul
ca modelul matematic prezentat in literatura de specialitate este
aplicabil curbelor realizate cu viteze apropiate de cele de echilibru
termodinamic. |
31. |
BETOANE SPECIALE CU POLIMERI |
¹ Nicolae ANGELESCU, ¹ Ioana ION ,¹
Darius STANCIU, ²José BARROSO AGUIAR |
1 Valahia University Targoviste,
² Minho University, Guimarães, Portugal |
nicolae.angelescu
@yahoo.com |
Abstract. Dezvoltarea unor
materiale polimerice ofera noi perspective stiintifice si tehnologice
datorita proprietatilor deosebite ale acestora. Aceste proprietati
se obtin fie datorita efectului de dispersie a polimerilor fie datorita
polimerizarii acestora si a interventiei lor in formarea structurii.
S-au preparat betoane cu polimeri din rasina epoxidica,ciment portland,
precum si agregat fin si grosier pentru a evalua influenta dozajului
de rasina asupra miscrostructurii si densitatii structurilor intarite
ale unor asemenea amestecuri de betoane. In lucrare sunt prezentate
caracteristicile materiilor prime folosite in lucrarile experimentale
si proprietatile structurale ale betoanelor studiate. |
32. |
ON THE ASSESSMENT MODE OF SOME SAFETY COEFFICIENTS USING BREAKING POLYNOMIAL CRITERIA |
Radu I. IATAN 1) , Pavel Gh. FLORESCU 1) , Carmen. T. POPA 2) ,
Gheorghita TOMESCU 3) |
1 University POLITEHNICA of Bucharest ; 2 VALAHIA University Târgoviste;
3 S. C. UPET S. A. Târgoviste |
r_iatan
@yahoo.com |
Abstract. Starting of the characteristic expressions of some breaking polynomial criteria, known and used in practice, it is highlighted how to assess the safety coefficients used in some practical cases. It is obvious that the decision belongs to the user given the experience in the adequate technical domain. In this regard it must not neglect the fact in that the breakage is produced most often in unpredictable moments, conditioned by multiple factors, dependent on material, on manufacturing technologies of finished products, respective the operating conditions.
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