Rubber sheet. Blank Pins network

Size: px
Start display at page:

Download "Rubber sheet. Blank Pins network"

Transcription

1 Proiect PN-II-ID-PCE-1759 DEZVOLTAREA UNUI NOU CONCEPT DE CONDUCERE A PROCESELOR DE DEFORMARE PLASTICA BAZAT PE NOI TEHNICI DE REDUCERE A DIMENSIONALITATII - Stadiul actual - Procesele de deformare plastica sunt din ce in ce mai larg raspandite in industria aeronautica, constructoare de automobile, electronica, automatica, alimentara, s.a. Ponderea pieselor obtinute prin deformare plastica fata de cele obtinute prin alte procedee este de peste 60% ceea ce determina urmtoarele cerinte privind procesele de deformare plastica: - cresterea cometitivitatii produselor prin asigurare calitati acestora; - cresterea cometitivitatii intreprinderilor producatoare prin asigurarea raportului optim calitate-pret. Avand in vedere cerintele de mai sus, s-au dezvoltat si continua sa se dezvolte cercetari pentru identificarea celor mai bune metode de aplicat pentru indeplinira lor, si anume : a). conducerea procesului de deformare plastica ; b). controlul procesului de deforare plastica ; c). utilizarea instrumentelor numerice pentru proictarea proceselor si echipamentelor tehnologice. Tema proiectului de fata este dezvoltarea unui nou concept de conducere a proceselor de deformare plastica la rece, bazat pe noi tehnici de reducere a dimensionalitatii precum si integrarea si validarea acestuia in cadrul unei noi metodologii de proiectare a proceselor. a). Stadiul actual privind conducerea proceselor de deformare plastica Cercetari substantiale au fost realizate folosind ca instrumente produse soft CAD si CAE. Daca partea de proiectare CAD a fost mult dezvoltata si fructificata pentru a indeplini rolul de predictie a defectelor pieselor, modulul CAE nu a fost suficient explorat pana in prezent. Optimizarea parametrilor proceselor de deformare plastica cu scopul cresterii acuratetei rezultatelor se realizeaza, in mod frecvent, prin ajustare manuala si simulari numerice repetate decizi bazandu-se pe experienta inginrilor proiectanti. O metoda automta este propusa de catre LIU Q. si col. [1] in cadrul careia algoritmul de optimizare primeste informatii de la post-procesorul CAE si, prin repetarea acestei bucle de calcul pana la indeplinirea unei conditii de restrictie (de exemplu, incadrarea variatiei grosimii piesei deformate intre anumit limite impuse) se detemina parametrii optimi de proces. Aplicarea acesei metode asigura rapiditatea luarii deciziei dar nu poate asigura un nivel ridicat al calitatii piesei sau optimizarea unui numar mai mare de parametri, fiecare avand conditiile de restrictie specifice. b). Stadiul actual privind controlul proceselor de deformare plastica Necesitatea asigurarii controlului proceselor de deformare plastica a determinat adoptarea unor noi solutii constructive ale matritelor,de la constructia modularapana la matritele cu suprafete discrete, astfel incat sa fie posibila amplasarea si actionarea elementelor de control atat in faza de pregatire cat si chiar in timpul derularii procesului.

2 Constructia matritelor recnfigurabile cu suprafete discrete a aparut si evoluat, ca o solutie «de varf», dua cum urmeaza: Deformarea cu matrite reconfigurabile multipunct (MPF multi-point forming) este o tehnologie flexibila de fabricare prin care se poate realiza o mare varietate de piese din tabla, in mare parte destinate industriei automobilelor si aeronautice, cu costuri mult diminuate fata de conditiile utilizarii matritelor monobloc. Rubber sheet Blank Pins network Caracterul particular al acestei deformari este dat de constructia discreta a suprafetei de lucru a elementelor active, care este compusa dintr-un numar de pini pozitionati pe verticala, conform geometriei piesei de fabricat. Referintele [2]-[7] sunt reprezentative privind primele cercetari in domeniul constructiei discrete a matritelor. Astfel, Hardt, Boyce si Walczky [2], [3], [4] si [5] au dezvoltat algoritmi de comanda numerica a deplasarii pe verticala a pinilor in vederea generarii suprafetei de lucru a elementelor active. Ei au elaborat principiile reconfigurabilitatii elementelor active pentru o fabricaţie flexibila (RTFF). Li si colaboratorii [6]-[16] au realizat o serie de progrese in domeniul deformarii tablelor metalice cu matrite multipunct (MPF). Pornind de la tehnologia MPF s-a dezvoltat conceptul mai nou al deformarii cu suprafete de lucru digitizate (DDF Digitized-die forming) care permite obtinerea unor piese de dimensiuni mari cu seturi de elemente active de dimensiuni mici. Principiul DDF consta in realizarea piesei sectiune cu sectiune, ceea ce ii da un caracter si mai mare de flexibilitate decat tehnica MPF. Li, Cai si Liu [23], continuand cercetarile in acest domeniu, au propus o noua tehnologie pentru realizarea pieselor complexe ambutisate cu matrite multipunct, si anume tehnica VP-DDF (Varying path DDF). In acest caz forma zonei de lucru a elementelor active variaza continuu in timpul procesului de deformare, variatie comandata numeric. Modul de variatie a acestei forme este descrisa printr-o serie de forme intermediare corespunzatoare momentelor t 0, t 1,, t i, t f. Calculul pozitiei fiecarui pin la fiecare moment t i se realizeaza pe principiul asigurarii contactului continuu dintre acesta si materialul de deformat. In acest fel, controlul in timp real a pozitiei pinilor se realizeaza pe un criteriu geometric, pe baza unor traiectorii calculate a-priori, nu pe baza reactiei de raspuns a materialului in timpul deformarii. Multi-step DDF a aparut ca o aproximare a tehnicii VP-DDF si consta in realizarea piesei prin deformarea succesiva in mai multi pasi. Aceasta metoda este mult mai usor de implementat in practica decat tehnica VP-DDF mentinand majoritatea avantajelor acesteia. Evoultia cercetarilor in domaniul deformarii cu matrite multipunct s-a manifestat prin propunerea de catre cercetatori a tehnicii Closed-loop forming process care consta in integrarea in sistemul DDF a unui sistem de feedback privind forma piesei. Rolul acestuia din urma este realizat de catre un sistem rapid de masurare 3D asociat cu softul corespunzator. Algoritmul de control utilizeaza suprafata de lucru a matritei multipunct ca parametru controlabil ca urmare a erorilor dimensionale si de forma determinate prin masurare rapida a piesei curente. Hardt si colaboratorii [3] si [4] au

3 dezvoltat o procedura matematica numita functia de transfer a deformatiei pentru a realiza predictia formei corectate a suprafetei de lucru a elementelor active pornind de la suprafata masurata a piesei dupa deformare. Prin cercetare experimentala s-a stabilit ca un numar de maxim 5 cicluri deformare-masurare-corectare este suficient pentru a elimina erorile dimensionale si de forma ale piesei si a definitiva pozitiile pinilor. Aceasta solutie are, totusi, dezavantajele si limitarile ei: - tehnicile DDF, VP-DDF, Multi-step DDF si Clodes-loop forming au fost dezvoltate si pot fi aplicate in mod eficient pentru piese de dimensiuni mari, de complexitate medie, avand aceeasi sectiune de-a lungul unei generatoare de forma complexa. Aceste piese sunt fabricate, in general, pentru industria aeronautica. In industria automobilelor, insa, piesele din tabla obtinute prin ambutisare au forme deosebit de complexe, ceea ce genereaza dificultati si necesita inca cercetari substantiale pentru implementarea tehnicilor de mai sus. - nici una din tehnicile dezvoltate nu asigura controlul in timp real a pozitiei pinilor pornind de la reactia de raspuns a materialului sursa cea mai corecta de informatii privind pierderea stabilitatii materialului, generatoare de defecte, in timpul procesului de deformare. - solutia nu poate fi generalizata/extinsa la toate tipo-dimensiunile de piese si la toate procedeele de deformare plastica. - asa cum a fost ea dezvoltata pana in prezent, se bazeaza pe considerarea procesului de prelucrare in ansamblu, ceea ce ingreuiaza actiunile de analiza, optimizare, control datorita dimensiunilor si implicit a complexitatii problemei. O alta solutie constructiva folosita pana in prezent este constructia modulara a matritelor [19] fara a se asigura controlul adaptiv al parametrilor procesului. In aceasta situatie se impune identificarea conditiilor de aplicare a acestor solutii constructive astfel incat sa se asigure aplicarea noului concept privind conducerea si cotrolul proceselor de deformare plastica, bazate pe tehnici de reducere a dimensionalitatii, obiectiv tinta al propunerii de fata. c). Stadiul actual privind simularea numerica In ultimii ani, instrumentele numerice au devenit indispensabile, ele determinand economii mari de timp, efort, materii prime si energie. Dupa cum s-a vazut, simularea numerica intervine si in asigurarea conducerii si a controlului proceselor de deformare plastica. Totusi, s-au identificat unele probleme care necesita eforturi de cercetare in urmatoarele directii: cresterea eficientei de calcul prin algoritmi de optimizare si programare paralela; cresterea exactitatii rezultatelor prin implementarea, in programele de calcul, a unor noi si mai exacte modele constitutive privind comportarea materialelor; cresterea exactitatii rezultatelor prin implementarea unei descrieri mai corecte atat a procedeului tehnologic cat si a paramerilor procesului. diminuarea volumul mare al calcului la simularea numerica, datorat dimensiunilor mari ale modelului procesului. In directia identificarii unor noi legi privind comportarea materialelor s-au inregistrat eforturi substantiale din partea cercetatorilor [20] [22], [24] pentru stabilirea unor modele constitutive ce tin seama atat de modificarile la nivel macroscopic cat si la nivel microscopic ale materialului in timpul unui proces de deformare plastica. Identificarea acestor modele constitutive s-a realizat, pana in prezent, pe baza incercarilor simple

4 (tractiune, compresiune, forfecare), combinate (tractiune-forfecare, forfecarecompresiune) si ciclice din dorinta de a asigura traiectorii ale deformatiilor cat mai apropiate de cele la care sunt supuse materialele in timpul proceselor reale de deformare plastica. In procesele reale, insa, materialul este solicitat la cicluri de amplitudine mare intretaiate de solicitari monotone ceea ce face necesara dezvoltarea un noi metodolgii experimentale de identificare a legii de comportare a materialelor cu scopul cresterii acuratetei rezultatelor simularii numerice, unul din obiectivele acestui proiect. Cu atat mai mult, daca rezultatele simularii numerice sunt folosite pentru stabilirea unor legi cauza-efect cu scopul reducerii timpului necesar deciziei ce asigura controlul on-line al procesului, cumularea erorilor datorate de inexactitatea modelului constitutiv cu cele generate de tehnica de extragere a cunostintelor poate avea un impact negativ semnificativ asupra calitatii rezultatelor. Daca experimental este inteleasa importanta considerarii tuturor elementelor procesului de deformare plastica in ansamblu, numeric este foarte dificila simularea lor ca in realitate (ca dimensiuni, geometrie, amplasare, cinematica). Inlocuirea unor elemente prin efectele lor [17] poate constitui o solutie pentru diminuarea volmului de calcul dar, aceasta, cu dezavantajul diminuarii acuratetei rezultatelor obtinute. Ultimele doua directii de cercetare determina masuri contradictorii care ar putea avea o rezolvare, pe viitor, prin aplicarea tehnicilor de reducere a dimensionalitatii combinata cu actualizarea permannta a modelului redus si a parametrilor acestuia, un alt obiectiv al proiectului propus. Importanta si relevanta continutului stiintific al proiectului decurge, in contextul celor prezentate mai sus, din posibilitatea de a deschide calea catre inlaturarea neajunsurilor enumerate, prin dezvoltarea unui nou concept de conducere a proceselor de deformare plastica la rece, bazat pe noi tehnici de reducere a dimensionalitatii. Contributiile majore ale proiectului constau in: i). dezvoltarea unui nou model conceptual privind conducerea proceselor de deformare plastica la rece; ii). considerarea procesului de deformare plastica la rece ca ansamblu de elemente caracteristice echivalente cu stari de tensiuni caracteristice mai usor de controlat in timpul desfasurarii procesului; iii). structurarea modelului redus al procesului de deformare plastica tinand cont de elementele sale caracteristice; iv). elaborarea unei noi metode de identificare a legii de comportare a materialului folosind un model redus al procesului de deformare plastica; v). identificarea paramerilor procesului de deformare plastica si a legilor ce guverneaza evolutia acestora, prin folosirea tehnicilor data mining; vi). elaborarea algorimului de control adaptiv prin actualizarea periodica a parametrilor si structurii modelului redus al procesului de deformare plastica prin tehnici de identificare on-line a parametrilor; vii). elaborarea unei noi metodologii de proiectare a proceselor de deformare plasica la rece. Pe de alta parte, relevanta continutului stiintific al proiectului este subliniata de atentia acordata problematicii abordate de prestigioase publicatii*, colective de cercetatori** cu care membrii colectivului de cercetare colaboreaza deja, retele internationale de cercetare *** (responsabilul de proiect este membru activ al acestora). * Spre exemplu, International Journal of Materials Processing Technologies ** Spre exemplu colectivele conduse de prof. A. Makinouchi (RIKEN Institut, Japan), C. Teodosiu (Universite Paris13, France), L. Menezes (University of Coimbra, Portugal). *** Spre exemplu ESAFORM (European Scientific Association for Material FORMing), Society of Automotive Engineers of Japan.

5 Bibliografie selectiva [1] Quiang Liu, Wenjuan Liu, Hongyang Qiu, Parameters automated optimization in sheet metal forming process, Journal of Materials Processing Technology, vol , 12 june 2007, pg [2] Walczyk, D.F. and Hardt, D.E., Design and Analysis of Reconfigurable Discrete Dies for Sheet Metal Forming, Journal of Manufacturing Systems, 1998, 17(6), [3] Nardiello, J., Christ, R., and Papazian, J.M., Block Set Form Die Assembly, USA Patent 6,053,026, April [4] Papazian, J.M., Anagnostou, E.L., Christ, R.J., Hoitsma, D., Orivile P, Schwarz, R.C., Spitzer, K., and Barkley, C., Tooling for Rapid Sheet metal parts production, 6th Joint FAA/DoD/NASA conference on Aging Aircraft, September 2002 [5] Walczyk, D.F. and Longtin, R.S., Fixturing of compliant parts using a matrix of reconfigurable parts, ASME Journal of Manufacturing Science and Engineering, 2000, 122(4), [6] Kelkar, A., Koc, B., and Nagi, R., Rapidly Re-configurable Mold Manufacturing, 2003 ASME Design and Manufacturing Conference, Chicago, Illinois, September 2-6, 2003 [7] Cai, Z.Y., Li, M.Z, Optimum path forming technique for sheet metal and its realization in multi-point forming. J. Mater. Process. Technol. 110 (2001), pag [8] Mingzhe, L., Yuhong, L., Multi-point forming: a flexible manufacturing method for a 3D surface sheet. J. Mater. Process. Technol. 87 (1999), pag [9] Cai, Z.Y., Li, M.Z., Multi-point forming of three-dimensional sheet metal and the control of the forming process. Int. J. Pressure Vessels Piping 79 4 (2002), pag [10] Cai, Z.Y., Li, M.Z., Yan, Q.G., Flexible forming for sheet metal, Journal of Applied Science 20 (2002) (in Chinese). [11] Chen, J.J., Li, M.-Z., Multi-point section forming technology, J. Harbin Instit. Technol. 32 (2000) (4), pag [12] Zhongyi, C., Mingzhe, L., Zhaohua, F., Theory and method of optimum path forming for sheet metal, Chin. J. Aeronautics 14 2 (2001), pp [13] Cai, Z., Li, M., Optimum path forming technique for sheet metal and its realization in multi-point forming, Journal of Materials Processing Technology, Vol. 110, pag , [14] Boers, S.H.A., Schreurs, P.J.G., Geers, M.G.D., Path-Dependent Plasticity and 3D Discrete Forming, VIII International Conference on Computational Plasticity, COMPLAS VIII, CIMNE, Barcelona, [15] Paunoiu, V., Nicoara, D., Design an experimental reconfigurable die for sheet metal forming, Analele Universităţii Dunărea de Jos din Galaţi, fasc. V, 2006, pag , ISSN [16] Păunoiu, V., Epureanu, A., Nicoară, D., Ciocan, O. - A review of the sheet metal forming methods using reconfigurable dies, Analele Universităţii Dunărea de Jos din Galaţi, Fascicole 5, Tehnologii in Constructia de Maşini, ISSN , 2006, pag [17] T. Jansson, A. Andersson, L. Nilsson, Optimization of draw-in for an automotive sheet metal part An evaluation using surrogate models and response surfaces, Journal of Materials Processing Technology, vol. 159, issue 3, 10 february 2005, pg [18] K. Willcox, A. Megretski, Fourier series for accurate, stable, reduced-order models in large-scale linear applications, SIAM J. Sci. Comput., vol. 26, no. 3, 20 january 2005, pg [19] C. Maier, M. Teodorescu, Dtru. Nicoara, 1999, Analysis of Draw Bead Effect on the Elastic Recovery in Deep Drawing Process, Second ESAFORM Conference on Metal Forming, University of Minho, Portugal, , ISBN [20] H.Haddadi, S. Bouvier, M. Banu, C. Maier and C. Teodosiu, Towards an accuarate description of the anisotropic behaviour of sheet metals under large plastic deformations modelling, numerical analysis and identification, International Journal of Plasticity, Volume 22, Issue 12, December 2006, Pages , Elsevier Science, ISSN: [21] C.Maier, T. Yamada, M. Gasperini, V. Tabacaru, Numerical Modeling of the Specimen Clamping System Used in Shearing Tests, Proceedings of the 8 th European ESAFORM Conference, Romanian Academy Publish House, Ed. D. Banabic, , ISBN , pg , 2005 [22] Gavrus, M. Banu, E. Ragneau, C. Maier, V. Marinescu, Identification of Material Parameters for Deep-Drawing Process Using An Inverse Analysis of the Erichsen Test, Conferinta Internationala SIA2007, octombrie 2007, Caen, Franta, SIA [23] Y. Kawashima, Y. Sakai, Large deformation analysis of hyperelastic materials using SPH method, e-journal of Soft Materials, vol. 3, 2007, pg [24] J. L. Alvez, S. Bouvier, M.C. Oliveira, L.F. Menezes, Drawbeads: To Be or Not to Be, NUMISHEET 2005, AIP

6 Conference Proceedings, American Insitute of Physics, / , vol. 778, p , [25] C. Maier, M. Teodorescu, A. Dimofte, Model matematic al starii de tensiuni si deformatii in zona nervurilor de retinere la ambutisarea pieselor complexe, Revista Constructia de Masini, Bucuresti, nr.3-4, 1-4, 2000, ISSN

STUDIU COMPARATIV PRIVIND COSTURILE DE FABRICATIE A UNEI PIESE REPREZENTATIVE

STUDIU COMPARATIV PRIVIND COSTURILE DE FABRICATIE A UNEI PIESE REPREZENTATIVE STUDIU COMPARATIV PRIVIND COSTURILE DE FABRICATIE A UNEI PIESE REPREZENTATIVE Gabriela Georgeta NICHITA Universitatea din Oradea, e-mail: gnichita@uoradea.ro Abstract: By comparative study in this paper,

More information

USE OF RENEWABLE ENERGY TO ENSURE THE THERMAL INDEPENDENCE FOR A LIVING BUILDING USING SOLAR HYBRID SYSTEMS

USE OF RENEWABLE ENERGY TO ENSURE THE THERMAL INDEPENDENCE FOR A LIVING BUILDING USING SOLAR HYBRID SYSTEMS BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI Publicat de Universitatea Tehnică Gheorghe Asachi din Iaşi Tomul LVIII (LXII), Fasc. 1, 2012 Secţia CONSTRUCŢII. ARHITECTURĂ USE OF RENEWABLE ENERGY TO ENSURE

More information

INFLUENCE OF STIFFNESS ON THE TORSIONAL RESPONSE OF ONE STORY STRUCTURE

INFLUENCE OF STIFFNESS ON THE TORSIONAL RESPONSE OF ONE STORY STRUCTURE BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI Publicat de Universitatea Tehnică Gheorghe Asachi din Iaşi Tomul LIX (LXIII), Fasc. 4, 2013 Secţia CONSTRUCŢII. ARHITECTURĂ INFLUENCE OF STIFFNESS ON THE TORSIONAL

More information

Data Mining in Marketing

Data Mining in Marketing Data Mining in Marketing Data mining în cercetări de marketing Data mining este una din cele mai bune metode de a identifica tendinţe şi şabloane (de comportament) din mulţimea de date avute la dispoziţie.

More information

PURE SHEARING TESTS OF A PRANDTL-TYPE MATERIAL

PURE SHEARING TESTS OF A PRANDTL-TYPE MATERIAL U.P.B. Sci. Bull., Series D, Vol. 72, Iss. 3, 2010 ISSN 1454-2358 PURE SHEARING TESTS OF A PRANDTL-TYPE MATERIAL Costică ATANASIU 1, Ştefan Dan PASTRAMĂ 2, Florin BACIU 3, Daniel VLĂSCEANU 4 Materialele

More information

PRECISION FORGING OF BEVEL GEAR WITH STRAIGHT TEETH

PRECISION FORGING OF BEVEL GEAR WITH STRAIGHT TEETH BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI Publicat de Universitatea Tehnică Gheorghe Asachi din Iaşi Tomul LXI (LXV), Fasc. 2, 2015 SecŃia CONSTRUCłII DE MAŞINI PRECISION FORGING OF BEVEL GEAR WITH STRAIGHT

More information

ABOUT THE STATIC BEHAVIOUR OF ELECTRO- DISCHARGE MACHINE

ABOUT THE STATIC BEHAVIOUR OF ELECTRO- DISCHARGE MACHINE U.P.B. Sci. Bull., Series D, Vol. 72, Iss. 2, 2010 ISSN 1454-2358 ABOUT THE STATIC BEHAVIOUR OF ELECTRO- DISCHARGE MACHINE Laurenţiu BĂLUŢĂ 1, Traian AURITE 2 Elementele de structură ale maşinilor de prelucrat

More information

STATISTIC MODELS OF CUTTING TOOL DURABILITY FUNCTION IN TURNING 40C130 THERMAL SPRAY COATINGS

STATISTIC MODELS OF CUTTING TOOL DURABILITY FUNCTION IN TURNING 40C130 THERMAL SPRAY COATINGS U.P.B. Sci. Bull., Series D, Vol. 69, No. 3,,2007 ISSN 1454-2358 STATISTIC MODELS OF CUTTING TOOL DURABILITY FUNCTION IN TURNING 40C130 THERMAL SPRAY COATINGS Mihaiela ILIESCU 1, Marian GHEORGHE 2 Straturile

More information

SOFTWARE APPLICATION FOR IRRIGATION WATER MANAGEMENT OPTIMIZATION APLICATIE SOFTWARE PENTRU OPTIMIZAREA MANAGEMENTULUI APEI PENTRU IRIGATII

SOFTWARE APPLICATION FOR IRRIGATION WATER MANAGEMENT OPTIMIZATION APLICATIE SOFTWARE PENTRU OPTIMIZAREA MANAGEMENTULUI APEI PENTRU IRIGATII SOFTWARE APPLICATION FOR IRRIGATION WATER MANAGEMENT OPTIMIZATION APLICATIE SOFTWARE PENTRU OPTIMIZAREA MANAGEMENTULUI APEI PENTRU IRIGATII Abstract: During the last decade the climate started to get warmer

More information

RESEARCHES REGARDING AN INCREMENTAL FORMING PROCESS BY MEANS OF AN INDUSTRIAL ROBOT

RESEARCHES REGARDING AN INCREMENTAL FORMING PROCESS BY MEANS OF AN INDUSTRIAL ROBOT BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI Publicat de Universitatea Tehnică Gheorghe Asachi din Iaşi Tomul LIX (LXIII), Fasc. 1, 2013 Secţia CONSTRUCŢII DE MAŞINI RESEARCHES REGARDING AN INCREMENTAL FORMING

More information

NUMERICAL MODELS USED FOR THE CALCULATION OF THE CABLE-STAYED BRIDGE AT KM OVER DANUBE-BLACK SEA CANAL

NUMERICAL MODELS USED FOR THE CALCULATION OF THE CABLE-STAYED BRIDGE AT KM OVER DANUBE-BLACK SEA CANAL DOI: 10.1515/rjti-2016-0047 ROMANIAN JOURNAL OF TRANSPORT INFRASTRUCTURE NUMERICAL MODELS USED FOR THE CALCULATION OF THE CABLE-STAYED BRIDGE AT KM 0+540 OVER DANUBE-BLACK SEA CANAL Mutu Costin Stelian,

More information

Business process reengineering. Alexandra Lovin Master SSA

Business process reengineering. Alexandra Lovin Master SSA Business process reengineering Alexandra Lovin Master SSA Cuprins Introducere Concepte BPR Metodologii Concluzii BPR - introducere Definitie: regandire fundamentala, redesign radical -> transformare, inovare

More information

INFILTRATION MODELING THROUGH AN EARTH DAM CASE STUDY

INFILTRATION MODELING THROUGH AN EARTH DAM CASE STUDY BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI Publicat de Universitatea Tehnică Gheorghe Asachi din Iaşi Volumul 63 (67), Numărul 3-4, 2017 Secţia HIDROTEHNICĂ INFILTRATION MODELING THROUGH AN EARTH DAM CASE

More information

STUDIES REGARDING THE EVOLUTION OF AGRICULTURE ASSOCIATIONS IN IAŞI COUNTY FOR DESIGNING VIABLE FARMS

STUDIES REGARDING THE EVOLUTION OF AGRICULTURE ASSOCIATIONS IN IAŞI COUNTY FOR DESIGNING VIABLE FARMS EVOLUTION OF AGRICULTURE ASSOCIATIONS IN IASI COUNTY FOR DESIGNING VIABLE FARMS Cercetări Agronomice în Moldova Vol. XLIII, No. 3 (143) / 2010 STUDIES REGARDING THE EVOLUTION OF AGRICULTURE ASSOCIATIONS

More information

ACTA TECHNICA NAPOCENSIS

ACTA TECHNICA NAPOCENSIS 497 TECHNICAL UNIVERSITY OF CLUJ-NAPOCA ACTA TECHNICA NAPOCENSIS Series: Applied Mathematics, Mechanics, and Engineering Vol. 57, Issue IV, November, 2014 REDESIGN OF SAFETY RING WORKPIECE FROM PROTECTION

More information

THE LAMINATION EFFECT FOR GLULAM BEAMS ACCORDING TO FRACTURE MECHANICS

THE LAMINATION EFFECT FOR GLULAM BEAMS ACCORDING TO FRACTURE MECHANICS BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI Publicat de Universitatea Tehnică Gheorghe Asachi din Iaşi Tomul LIV (LVIII), Fasc. 4, 2011 Secţia CONSTRUCŢII. ARHITECTURĂ THE LAMINATION EFFECT FOR GLULAM BEAMS

More information

NEW RESEARCH ON COMPOSITE MATERIALS AT THE METAL FORMING RESEARCH CENTRE

NEW RESEARCH ON COMPOSITE MATERIALS AT THE METAL FORMING RESEARCH CENTRE NEW RESEARCH ON COMPOSITE MATERIALS AT THE METAL FORMING RESEARCH CENTRE Claudia GÎRJOB 2, Octavian BOLOGA 1,2, Gabriel RACZ 2, Cristina BIRIS 2 1 Full Member of the Academy of Technical Sciences of Romania,

More information

powered by Starbyte ekollect Debt Collection

powered by Starbyte ekollect Debt Collection powered by Starbyte ekollect Debt Collection Summary New Features Preventive, 1. Telephony Integration in Cloud with VOIP 2. Notifications management 3. Document Management 4. Legal and Hard Collection

More information

MATERIAL FLOW PATTERN AND STRUCTURE EVALUATION DURING EXTRUSION OF 2024 ALUMINIUM ALLOY

MATERIAL FLOW PATTERN AND STRUCTURE EVALUATION DURING EXTRUSION OF 2024 ALUMINIUM ALLOY U.P.B. Sci. Bull., Series B, Vol. 72, Iss. 2, 2010 ISSN 1454-2331 MATERIAL FLOW PATTERN AND STRUCTURE EVALUATION DURING EXTRUSION OF 2024 ALUMINIUM ALLOY Nicolae SOLOMON 1, Iulia SOLOMON 2 Curgerea neuniformă

More information

Lista de lucrări. C) Lucrări ştiinţifice publicate în reviste de specialitate reviste CNCSIS (B+) reviste indexate BDI / ISI Web of Knowledge :

Lista de lucrări. C) Lucrări ştiinţifice publicate în reviste de specialitate reviste CNCSIS (B+) reviste indexate BDI / ISI Web of Knowledge : Universitatea Tehnică din Cluj-Napoca Facultatea: Construcţii de Maşini Departamentul: Ingineria Fabricaţiei Ş.l.dr.ing. Păcurar Răzvan Lista de lucrări A) Teza de doctorat 1. Titlul de doctor obţinut

More information

MANAGEMENTUL PROGRAMELOR EUROPENE CU IMPACT ASUPRA SECTORULUI ENERGETIC AL ROMÂNIEI

MANAGEMENTUL PROGRAMELOR EUROPENE CU IMPACT ASUPRA SECTORULUI ENERGETIC AL ROMÂNIEI MANAGEMENT OF EUROPEAN PROGRAMS WITH IMPACT ON THE ENERGY ROMANIAN SECTOR MANAGEMENTUL PROGRAMELOR EUROPENE CU IMPACT ASUPRA SECTORULUI ENERGETIC AL ROMÂNIEI Irina POPA Ph.D. Student, Bucharest Academy

More information

PERFORMANCES OF THE CONCRETE MASONRY WITH RECYCLED WOOD CHIPS (I)

PERFORMANCES OF THE CONCRETE MASONRY WITH RECYCLED WOOD CHIPS (I) BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI Publicat de Universitatea Tehnică Gheorghe Asachi din Iaşi Volumul 64 (68), Numărul 3, 2018 Secţia CONSTRUCŢII. ARHITECTURĂ PERFORMANCES OF THE CONCRETE MASONRY

More information

RESEARCH ON ACTIVE ELEMENTS WEAR OF THE WORKING BODIES USED ON CEREALS MILING

RESEARCH ON ACTIVE ELEMENTS WEAR OF THE WORKING BODIES USED ON CEREALS MILING BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI Publicat de Universitatea Tehnică Gheorghe Asachi din Iaşi Tomul LIX (LXIII), Fasc. 2, 2013 SecŃia CONSTRUCłII DE MAŞINI RESEARCH ON ACTIVE ELEMENTS WEAR OF THE

More information

THE INFLUENCE OF HORIZONTAL DRAINAGE ON CROPS PRODUCTION IN THE TRIAL PLOT LACU SARAT, BRAILA

THE INFLUENCE OF HORIZONTAL DRAINAGE ON CROPS PRODUCTION IN THE TRIAL PLOT LACU SARAT, BRAILA THE INFLUENCE OF HORIZONTAL DRAINAGE ON CROPS PRODUCTION IN THE TRIAL PLOT LACU SARAT, BRAILA INFLUENŢA LUCRĂRII DE DRENAJ ORIZONTAL ASUPRA PRODUCŢIEI ÎN CÂMPUL EXPERIMENTAL LACU SĂRAT, BRĂILA Valentina

More information

PARTENERIATUL PUBLIC- PRIVAT ÎN NOUA ERĂ A ENERGIEI

PARTENERIATUL PUBLIC- PRIVAT ÎN NOUA ERĂ A ENERGIEI THE PUBLIC-PRIVATE PARTNERSHIP IN THE NEW ENERGY ERA PARTENERIATUL PUBLIC- PRIVAT ÎN NOUA ERĂ A ENERGIEI Ana-Mădălina POTCOVARU Ph.D. Student, Bucharest Academy of Economic Studies E-mail: madi_potcovaru@yahoo.com

More information

DEVELOPING AN INTEGRATED MAINTENANCE METHOD

DEVELOPING AN INTEGRATED MAINTENANCE METHOD U.P.B. Sci. Bull., Series C, Vol. 74, Iss. 3, 2012 ISSN 1454-234x DEVELOPING AN INTEGRATED MAINTENANCE METHOD Traian C. IONESCU 1, Alexandru Şt. VELICU 2 Lucrarea propune integrarea mentenanţei în sistemul

More information

AES BIOFLUX Advances in Environmental Sciences - International Journal of the Bioflux Society

AES BIOFLUX Advances in Environmental Sciences - International Journal of the Bioflux Society AES BIOFLUX Advances in Environmental Sciences - International Journal of the Bioflux Society Air quality modelling as a tool used in selecting technological alternatives for developing a new abrasive

More information

SOME ASPECTS REGARDING THE MICROSTRUCTURAL AND MECHANICAL CHARACTERISTICS OF THE WELD DEPOSIT ON MICROALLOYED STEELS FOR DIES

SOME ASPECTS REGARDING THE MICROSTRUCTURAL AND MECHANICAL CHARACTERISTICS OF THE WELD DEPOSIT ON MICROALLOYED STEELS FOR DIES U.P.B. Sci. Bull., Series B, Vol. 75, Iss. 1, 2013 ISSN 1454-2331 SOME ASPECTS REGARDING THE MICROSTRUCTURAL AND MECHANICAL CHARACTERISTICS OF THE WELD DEPOSIT ON MICROALLOYED STEELS FOR DIES Ion Mihai

More information

ISSUES FOR ACHIEVING AN EXPERIMENTAL MODEL CONCERNING BUBBLE DECK CONCRETE SLAB WITH SPHERICAL GAPS

ISSUES FOR ACHIEVING AN EXPERIMENTAL MODEL CONCERNING BUBBLE DECK CONCRETE SLAB WITH SPHERICAL GAPS BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI Publicat de Universitatea Tehnică Gheorghe Asachi din Iaşi Tomul LVI (LX), Fasc. 2, 2010 Secţia CONSTRUCŢII. ĂRHITECTURĂ ISSUES FOR ACHIEVING AN EXPERIMENTAL

More information

ABORDĂRI MODERNE PRIVIND EVALUAREA CONFORMITĂŢII BETONULUI MODERN APPROACHES REGARDING THE ASSESSMENT OF CONCRETE S CONFORMITY

ABORDĂRI MODERNE PRIVIND EVALUAREA CONFORMITĂŢII BETONULUI MODERN APPROACHES REGARDING THE ASSESSMENT OF CONCRETE S CONFORMITY Revista Română de Materiale / Romanian Journal of Materials 2011, 41 (1), 3-14 3 ABORDĂRI MODERE PRIVID EVALUAREA COFORMITĂŢII BETOULUI MODER APPROACHES REGARDIG THE ASSESSMET OF COCRETE S COFORMITY DA

More information

VARIANTS OF SUPPLY FOR THE SUBURBAN AREA'S POPULATION OF THE CITY OF IAŞI (ROMANIA), WITH MILK AND DAIRY PRODUCTS IN 2009

VARIANTS OF SUPPLY FOR THE SUBURBAN AREA'S POPULATION OF THE CITY OF IAŞI (ROMANIA), WITH MILK AND DAIRY PRODUCTS IN 2009 VARIANTS TO SUPPLY WITH MILK AND DAIRY PRODUCTS Cercetări Agronomice în Moldova Vol. XLIV, No. 2 (146) / 2011 VARIANTS OF SUPPLY FOR THE SUBURBAN AREA'S POPULATION OF THE CITY OF IAŞI (ROMANIA), WITH MILK

More information

The Structural Adequacy of a Reinforced Concrete Element Exposed to Fire

The Structural Adequacy of a Reinforced Concrete Element Exposed to Fire Acta Technica Napocensis: Civil Engineering & Architecture Vol. 57, No. 2 (2014) Journal homepage: http://constructii.utcluj.ro/actacivileng The Structural Adequacy of a Reinforced Concrete Element Exposed

More information

GELIVITY EFFECTS ON CONSTRUCTION ELEMENTS

GELIVITY EFFECTS ON CONSTRUCTION ELEMENTS BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI Publicat de Universitatea Tehnică Gheorghe Asachi din Iaşi Tomul LV (LIX), Fasc. 4, 2009 Secţia CONSTRUCŢII. ĂRHITECTURĂ GELIVITY EFFECTS ON CONSTRUCTION ELEMENTS

More information

RĂZVAN-ANDREI IERNUŢAN * and MARIA-NICOLETA ROMAN-PINTICAN

RĂZVAN-ANDREI IERNUŢAN * and MARIA-NICOLETA ROMAN-PINTICAN BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI Publicat de Universitatea Tehnică Gheorghe Asachi din Iaşi Tomul LX (LXIV), Fasc. 4, 2014 Secţia CONSTRUCŢII. ARHITECTURĂ EXPERIMENTAL DETERMINATION OF MECHANICAL

More information

DYNAMIC ANALYSIS BY NUMERICAL SIMULATION OF THE VARIATION OF THE HYDRAULIC PARAMETERS OF THE SOLENOID INJECTOR

DYNAMIC ANALYSIS BY NUMERICAL SIMULATION OF THE VARIATION OF THE HYDRAULIC PARAMETERS OF THE SOLENOID INJECTOR BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI Publicat de Universitatea Tehnică Gheorghe Asachi din Iaşi, Tomul LX (LXIV), Fasc. 2, 2014 Secţia CONSTRUCŢII DE MAŞINI DYNAMIC ANALYSIS BY NUMERICAL SIMULATION

More information

DIMENSIONAL OPTIMIZATION FOR SEGMENTED UNDERPINNING BASED ON THE STRUCTURAL RESPONSE

DIMENSIONAL OPTIMIZATION FOR SEGMENTED UNDERPINNING BASED ON THE STRUCTURAL RESPONSE BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI Publicat de Universitatea Tehnică Gheorghe Asachi din Iaşi Volumul 62 (66), Numărul 2, 2016 Secţia CONSTRUCŢII. ARHITECTURĂ DIMENSIONAL OPTIMIZATION FOR SEGMENTED

More information

SHAKING TABLE TESTS OF A BASE ISOLATED STRUCTURE WITH MULTI-STAGE SYSTEM

SHAKING TABLE TESTS OF A BASE ISOLATED STRUCTURE WITH MULTI-STAGE SYSTEM BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI Publicat de Universitatea Tehnică Gheorghe Asachi din Iaşi Tomul LXI (LXV), Fasc. 3, 2015 Secţia CONSTRUCŢII. ARHITECTURĂ SHAKING TABLE TESTS OF A BASE ISOLATED

More information

PRECAST BEAM-COLUMN CONNECTION FOR INDUSTRIAL BUILDINGS

PRECAST BEAM-COLUMN CONNECTION FOR INDUSTRIAL BUILDINGS BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI Publicat de Universitatea Tehnică Gheorghe Asachi din Iaşi Volumul 64 (68), Numărul 2, 2018 Secţia CONSTRUCŢII. ARHITECTURĂ PRECAST BEAM-COLUMN CONNECTION FOR

More information

Experimental Researches regarding the Forming Limit Curves Using Reduced Scale Samples

Experimental Researches regarding the Forming Limit Curves Using Reduced Scale Samples Experimental Researches regarding the Forming Limit Curves Using Reduced Scale Samples Viorel Păunoiu, Dumitru Nicoară Ana Maria Cantera Lopez 2, Pedro Arroyo Higuera 2, Dunărea de Jos University of Galaţi,

More information

Impact of various parameters on the energy consumption of residential buildings

Impact of various parameters on the energy consumption of residential buildings Impact of various parameters on the energy consumption of residential buildings Rémi LAPEZE University of Savoie Mont Blanc Chambéry, France Email : remi.lapeze@gmail.com Saifdine BELYMAM University of

More information

SBR-ICEAS a proven treatment solution today and for the future

SBR-ICEAS a proven treatment solution today and for the future SBR-ICEAS a proven treatment solution today and for the future M. Hallberg*,1, S. Sankaramanchi* 2, J. Newman*, A. Pasculea** 3 and F. Andrei** *ITT Water and Wastewater, SE-174 87, Sundbyberg, Sweden

More information

SPORT MANAGEMENT SCIENCE AND ART

SPORT MANAGEMENT SCIENCE AND ART Analele Universităţii din Oradea Facicula Educaţie Fizică şi Sport ISSN 2286-2870, E-ISSN 1224-5100 Rev. nr. XXV /2015 pp 85-89 SPORT MANAGEMENT SCIENCE AND ART Sorin Dacian BUHAȘ University of Oradea,

More information

NEW WELDING TECHOLOGY THE COLD WELDING ON COGGED SURFACES

NEW WELDING TECHOLOGY THE COLD WELDING ON COGGED SURFACES NEW WELDING TECHOLOGY THE COLD WELDING ON COGGED SURFACES Bogdan GEORGESCU, Valeriu GEORGESCU Dunarea de Jos University of Galati, Romania email: valeriu.georgescu@ugal.ro ABSTRACT Welding by cold pressing

More information

COMPARATIVE STUDY RELATED TO FAILURE FORCE AND FAILURE MECHANISM BETWEEN REAL LIFE TEST AND 3-D FEM MODEL ON A HIGHWAY BEAM

COMPARATIVE STUDY RELATED TO FAILURE FORCE AND FAILURE MECHANISM BETWEEN REAL LIFE TEST AND 3-D FEM MODEL ON A HIGHWAY BEAM BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI Publicat de Universitatea Tehnică Gheorghe Asachi din Iaşi Tomul LXI (LXV), Fasc. 4, 2015 Secţia CONSTRUCŢII. ARHITECTURĂ COMPARATIVE STUDY RELATED TO FAILURE

More information

ACTA TECHNICA NAPOCENSIS

ACTA TECHNICA NAPOCENSIS TECHNICAL UNIVERSITY OF CLUJ-NAPOCA 447 ACTA TECHNICA NAPOCENSIS Series: Applied Mathematics, Mechanics, and Engineering Vol. 57, Issue III, September, 2014 NUMERIC SIMULATION OF THE HYDROFORMING PROCESS

More information

laterala a ultimului nivel, constituind, astfel, o analiza de tip,,pushover. Curbele de tip,,pushover obţinute sunt prezentate intr-o maniera comparat

laterala a ultimului nivel, constituind, astfel, o analiza de tip,,pushover. Curbele de tip,,pushover obţinute sunt prezentate intr-o maniera comparat 1 Moldovan Corina Technical College A. Saligny, Cluj-Napoca, Romania Received 23 June 2011; Accepted 20 August 2011 The present contribution is intended to be a state of the art review of semirigidity

More information

FINITE ELEMENT MODELLING OF ELASTOMERIC BEARINGS

FINITE ELEMENT MODELLING OF ELASTOMERIC BEARINGS BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI Publicat de Universitatea Tehnică Gheorghe Asachi din Iaşi Tomul LXI (LXV), Fasc. 2, 2015 Secţia CONSTRUCŢII. ARHITECTURĂ FINITE ELEMENT MODELLING OF ELASTOMERIC

More information

RESEARCHES CONCERNING THE PHYSICAL AND CHEMICAL BUFFALO MILK QUALITIES, AS RAW MATERIAL PRODUCED BY AN ECOLOGICAL FARM

RESEARCHES CONCERNING THE PHYSICAL AND CHEMICAL BUFFALO MILK QUALITIES, AS RAW MATERIAL PRODUCED BY AN ECOLOGICAL FARM Lucrări ştiinţifice Zootehnie şi Biotehnologii, vol.40(2), (2007), Timişoara RESEARCHES CONCERNING THE PHYSICAL AND CHEMICAL BUFFALO MILK QUALITIES, AS RAW MATERIAL PRODUCED BY AN ECOLOGICAL FARM CERCETĂRI

More information

RESEARCHES CONCERNING THE PRODUCTIVITY OF SOME SANDY- LAND GRASSLAND FROM VALEA LUI MIHAI BIHOR COUNTY

RESEARCHES CONCERNING THE PRODUCTIVITY OF SOME SANDY- LAND GRASSLAND FROM VALEA LUI MIHAI BIHOR COUNTY RESEARCHES CONCERNING THE PRODUCTIVITY OF SOME SANDY- LAND GRASSLAND FROM VALEA LUI MIHAI BIHOR COUNTY CERCETĂRI PRIVIND PRODUCTIVITATEA UNOR PAJIŞTI PSAMOFILE DE LA VALEA LUI MIHAI JUDEŢUL BIHOR Ştefania

More information

Axial Force Influence on Bolted Extended End-Plate Beam-to-Column Connection Behavior

Axial Force Influence on Bolted Extended End-Plate Beam-to-Column Connection Behavior Acta Technica Napocensis: Civil Engineering & Architecture Volume 61, No. \ 1, (2018) Journal homepage: http://constructii.utcluj.ro/actacivileng ISSN 1221-5848 Axial Force Influence on Bolted Extended

More information

FUZZY CONTROL APPLICATION FOR THE BIOPROCESS CONTROL OF A THERAPEUTIC PRODUCT PREPARATION

FUZZY CONTROL APPLICATION FOR THE BIOPROCESS CONTROL OF A THERAPEUTIC PRODUCT PREPARATION U.P.B. Sci. Bull., Series B, Vol. 73, Iss. 4, 2011 ISSN 1454-2331 FUZZY CONTROL APPLICATION FOR THE BIOPROCESS CONTROL OF A THERAPEUTIC PRODUCT PREPARATION Cristina TĂNASE 1, Camelia UNGUREANU 2, Mihai

More information

CHEMICAL FERTILIZERS APPLICATION ON AUTUMN WHEAT YIELD IN LONG-TERM EXPERIENCES

CHEMICAL FERTILIZERS APPLICATION ON AUTUMN WHEAT YIELD IN LONG-TERM EXPERIENCES CHEMICAL FERTILIZERS APPLICATION ON AUTUMN WHEAT YIELD IN LONG-TERM EXPERIENCES Cercetări Agronomice în Moldova Vol. XLVII, No. 3 (159) / 2014 INFLUENCE OF CHEMICAL FERTILIZERS APPLICATION ON AUTUMN WHEAT

More information

A NEW CONCEPT FOR ADDRESSING ENVIRONMENTAL QUALIFICATION OF INSTRUMENT AND CONTROL LOOPS IN NUCLEAR POWER PLANTS

A NEW CONCEPT FOR ADDRESSING ENVIRONMENTAL QUALIFICATION OF INSTRUMENT AND CONTROL LOOPS IN NUCLEAR POWER PLANTS U.P.B. Sci. Bull., Series C, Vol. 73, Iss. 3, 2011 ISSN 1454-234x A NEW CONCEPT FOR ADDRESSING ENVIRONMENTAL QUALIFICATION OF INSTRUMENT AND CONTROL LOOPS IN NUCLEAR POWER PLANTS Liviu DELCEA 1, Aureliu

More information

CHURCHES HEATING: A CHOICE BETWEEN CONSERVATION AND THERMAL CONFORT

CHURCHES HEATING: A CHOICE BETWEEN CONSERVATION AND THERMAL CONFORT BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI Publicat de Universitatea Tehnică Gheorghe Asachi din Iaşi Tomul LX (LXIV), Fasc. 4, 2014 Secţia CONSTRUCŢII. ARHITECTURĂ CHURCHES HEATING: A CHOICE BETWEEN CONSERVATION

More information

THE QUATERNARY CARBIDES IN LEDEBURITIC STEELS

THE QUATERNARY CARBIDES IN LEDEBURITIC STEELS U.P.B. Sci. Bull., Series B, ol. 69, No. 1, 2007 ISSN 1454-2331 THE QUATERNARY CARBIDES IN LEDEBURITIC STEELS. I. POPESCU 1 S-au realizat cercetări experimentale, în condiţii de uzină şi laborator, în

More information

WIG versus MAG Neural Network Control

WIG versus MAG Neural Network Control BULETINUL Universităţii Petrol Gaze din Ploieşti Vol. LXV No. 2/201 6-40 Seria Tehnică WIG versus MAG Neural Network Control Universitatea Petrol-Gaze din Ploieşti, Bd. Bucureşti 9, Ploieşti E-mail: gbucur@upg-ploiesti.ro

More information

Cooperative Multiagent Framework for Knowledge Retrieval

Cooperative Multiagent Framework for Knowledge Retrieval Cooperative Multiagent Framework for Knowledge Retrieval Florin Leon Mihai Horia Zaharia Dan Gâlea Department of Automatic Control and Computer Science Technical University Gh. Asachi Iaşi Abstract In

More information

THE BEHAVIOUR UNDER COMPRESSION OF ELASTOMERS USED IN BASE ISOLATION BEARINGS

THE BEHAVIOUR UNDER COMPRESSION OF ELASTOMERS USED IN BASE ISOLATION BEARINGS BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI Publicat de Universitatea Tehnică Gheorghe Asachi din Iaşi Tomul LIX (LXIII), Fasc. 6, 2013 Secţia CONSTRUCŢII. ARHITECTURĂ THE BEHAVIOUR UNDER COMPRESSION OF

More information

Revista Română de Materiale / Romanian Journal of Materials 2013, 43 (2),

Revista Română de Materiale / Romanian Journal of Materials 2013, 43 (2), Revista Română de Materiale / Romanian Journal of Materials 2013, 43 (2), 201 209 201 SIMULAREA PROCESULUI DE ARDERE ŞI A TRANSFERULUI TERMIC ÎN ZONA DE CLINCHERIZARE A CUPTORULUI ROTATIV SIMULATION OF

More information

AESTHETICS OF THE MAIN TYPES OF STRUCTURES

AESTHETICS OF THE MAIN TYPES OF STRUCTURES BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI Publicat de Universitatea Tehnică Gheorghe Asachi din Iaşi Tomul LIV (LVIII), Fasc. 4, 2011 Secţia CONSTRUCŢII. ARHITECTURĂ AESTHETICS OF THE MAIN TYPES OF STRUCTURES

More information

Prediction of Forces and Damage at Forming Sheet on Multipoint Die MANEA Marius Costin 1, a *, TIMOFTE Damian 2,b and VELICU Stefan 3,c

Prediction of Forces and Damage at Forming Sheet on Multipoint Die MANEA Marius Costin 1, a *, TIMOFTE Damian 2,b and VELICU Stefan 3,c Applied Mechanics and Materials Vol. 656 (2014) pp 215-222 Submitted: 01.08.2014 Online available since 2014/Oct/27 at www.scientific.net Revised: 10.08.2014 (2014) Trans Tech Publications, Switzerland

More information

METHODS USED IN ORDER R TO INCREASE HIGH FREQUENCY LOSSES IN PLANAR STRUCTURES

METHODS USED IN ORDER R TO INCREASE HIGH FREQUENCY LOSSES IN PLANAR STRUCTURES METHODS USED IN ORDER TO INCREASE HIGH FREQUENCY LOSSES IN PLANAR STRUCTURES METHODS USED IN ORDER R TO INCREASE HIGH FREQUENCY LOSSES IN PLANAR STRUCTURES Lecturer Eng. Adina RACASAN 1, PhD, Prof. Eng.

More information

ADHESIVE BONDING TECHNIQUES IN HYBRID STRUCTURES MADE FROM FIBRE REINFORCED POLYMERIC COMPOSITES AND CONCRETE

ADHESIVE BONDING TECHNIQUES IN HYBRID STRUCTURES MADE FROM FIBRE REINFORCED POLYMERIC COMPOSITES AND CONCRETE BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI Publicat de Universitatea Tehnică Gheorghe Asachi din Iaşi Tomul LV (LIX), Fasc. 3, 2009 Secţia CONSTRUCŢII. ĂRHITECTURĂ ADHESIVE BONDING TECHNIQUES IN HYBRID

More information

TEZĂ DE DOCTORAT Rezumat SISTEM AUTOMAT BAZAT PE AGENŢI INTELIGENŢI PENTRU MONITORIZAREA ŞI ANALIZA CALITĂŢII AERULUI

TEZĂ DE DOCTORAT Rezumat SISTEM AUTOMAT BAZAT PE AGENŢI INTELIGENŢI PENTRU MONITORIZAREA ŞI ANALIZA CALITĂŢII AERULUI UNIVERSITATEA PETROL- GAZE DIN PLOIEŞTI DEPARTAMENTUL AUTOMATICĂ, CALCULATOARE ŞI ELECTRONICĂ STUDII UNIVERSITARE DE DOCTORAT TEZĂ DE DOCTORAT Rezumat SISTEM AUTOMAT BAZAT PE AGENŢI INTELIGENŢI PENTRU

More information

EXPERIMENTAL TESTS OF THIN-WALLED STEEL ROOF PROFILES

EXPERIMENTAL TESTS OF THIN-WALLED STEEL ROOF PROFILES BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI Publicat de Universitatea Tehnică Gheorghe Asachi din Iaşi Tomul LIV (LVIII), Fasc. 4, 2011 Secţia CONSTRUCŢII. ARHITECTURĂ EXPERIMENTAL TESTS OF THIN-WALLED

More information

MELT SPUN Fe-Co-Cr-B-Si ALLOYS CORROSION CHARACTERIZATION

MELT SPUN Fe-Co-Cr-B-Si ALLOYS CORROSION CHARACTERIZATION U.P.B. Sci. Bull., Series B, Vol. 71, Iss. 4, 9 ISSN 1454-331 MELT SPUN Fe-Co-Cr-B-Si ALLOYS CORROSION CHARACTERIZATION Iulia SOLOMON 1, Nicolae SOLOMON Această lucrare prezintă rezultatele cercetărilor

More information

REPLACEMENT OF CONVENTIONAL SHEAR REINFORCEMENT IN A STEEL FIBRE REINFORCED-ULTRA HIGH PERFORMANCE CEMENT BEAM

REPLACEMENT OF CONVENTIONAL SHEAR REINFORCEMENT IN A STEEL FIBRE REINFORCED-ULTRA HIGH PERFORMANCE CEMENT BEAM BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI Publicat de Universitatea Tehnică Gheorghe Asachi din Iaşi Tomul LIX (LXIII), Fasc. 5, 2013 Secţia CONSTRUCŢII. ARHITECTURĂ REPLACEMENT OF CONVENTIONAL SHEAR

More information

EXPERIMENTAL TEST OF ELASTOMERIC BEARINGS USED IN BASE ISOLATION

EXPERIMENTAL TEST OF ELASTOMERIC BEARINGS USED IN BASE ISOLATION BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI Publicat de Universitatea Tehnică Gheorghe Asachi din Iaşi Tomul LXI (LXV), Fasc. 2, 2015 Secţia CONSTRUCŢII. ARHITECTURĂ EXPERIMENTAL TEST OF ELASTOMERIC BEARINGS

More information

PIPE LINES EXTERNAL CORROSION

PIPE LINES EXTERNAL CORROSION BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI Publicat de Universitatea Tehnică Gheorghe Asachi din Iaşi Tomul LIV (LVIII), Fasc. 1, 2008 Secţia CONSTRUCŢII. ARHITECTURĂ PIPE LINES EXTERNAL CORROSION BY DAN

More information

MANAGEMENTUL RESURSELOR UMANE ÎN SECTORUL PUBLIC - STUDIU ASUPRA SISTEMULUI PUBLIC DE SĂNĂTATE DIN ROMÂNIA

MANAGEMENTUL RESURSELOR UMANE ÎN SECTORUL PUBLIC - STUDIU ASUPRA SISTEMULUI PUBLIC DE SĂNĂTATE DIN ROMÂNIA HUMAN RESOURCES MANAGEMENT IN THE PUBLIC SECTOR: A STUDY OF THE PUBLIC HEALTH SYSTEM IN ROMANIA MANAGEMENTUL RESURSELOR UMANE ÎN SECTORUL PUBLIC - STUDIU ASUPRA SISTEMULUI PUBLIC DE SĂNĂTATE DIN ROMÂNIA

More information

Standarde GS1 la nivel european pentru gestiunea numerarului

Standarde GS1 la nivel european pentru gestiunea numerarului Standarde GS1 la nivel european pentru gestiunea numerarului Valentin POPESCU Director Programe, GS1 Romania FORUMUL NAȚIONAL SEPA, Ediția a VI-a Institutul Bancar Român, Atrium, 15 noiembrie 2012 București

More information

BIOREMEDIATION OF POLLUTED SOILS WITH PETROLEUM HYDROCARBONS BIOREMEDIEREA SOLURILOR POLUATE CU HIDROCARBURI DIN PETROL

BIOREMEDIATION OF POLLUTED SOILS WITH PETROLEUM HYDROCARBONS BIOREMEDIEREA SOLURILOR POLUATE CU HIDROCARBURI DIN PETROL BIOREMEDIATION OF POLLUTED SOILS WITH PETROLEUM HYDROCARBONS BIOREMEDIEREA SOLURILOR POLUATE CU HIDROCARBURI DIN PETROL MARIANA MARINESCU, M. DUMITRU, ANCA LĂCĂTUŞU National Research Development Institute

More information

RAPORT PREALABIL. Referitor la: Conditiile legale de activitate pentru magazinele duty free in Sudanul de Sud

RAPORT PREALABIL. Referitor la: Conditiile legale de activitate pentru magazinele duty free in Sudanul de Sud RAPORT PREALABIL Referitor la: Conditiile legale de activitate pentru magazinele duty free in Sudanul de Sud Acte Normative: Customs Act, 1986 (Legea vamala 1986) Activitatea duty-free in Sudanul de Sud,

More information

LANDFILLING OF WASTE INCINERATION RESIDUES BY STABILIZATION-SOLIDIFICATION

LANDFILLING OF WASTE INCINERATION RESIDUES BY STABILIZATION-SOLIDIFICATION LANDFILLING OF WASTE INCINERATION RESIDUES BY STABILIZATION-SOLIDIFICATION Mihail Reinhold WÄCHTER 1, 2, Ioana IONEL 1*, Petru NEGREA 3, Mircea Dorin VASILESCU 1, Adriana Raluca WÄCHTER 2 1 Politehnica

More information

FE modeling of cold-formed steel bolted joints in pitch-roof portal frames

FE modeling of cold-formed steel bolted joints in pitch-roof portal frames Acta Technica Napocensis: Civil Engineering & Architecture Vol. 55, No. 3 (2012) Journal homepage: http://constructii.utcluj.ro/actacivileng FE modeling of cold-formed steel bolted joints in pitch-roof

More information

THE NECESSITY OF PERFORMING CURRENT MAINTENANCE WORK ON BUILDINGS

THE NECESSITY OF PERFORMING CURRENT MAINTENANCE WORK ON BUILDINGS BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI Publicat de Universitatea Tehnică Gheorghe Asachi din Iaşi Volumul 64 (68), Numărul 2, 2018 Secţia CONSTRUCŢII. ARHITECTURĂ THE NECESSITY OF PERFORMING CURRENT

More information

MOISTURE EFFECTS ON THE STRAINS DEVELOPED IN GARDEN CHAIR COMPONENTS MADE OF COMPOSITE MATERIALS

MOISTURE EFFECTS ON THE STRAINS DEVELOPED IN GARDEN CHAIR COMPONENTS MADE OF COMPOSITE MATERIALS MOISTURE EFFECTS ON THE STRAINS DEVELOPED IN GARDEN CHAIR COMPONENTS MADE OF COMPOSITE MATERIALS Camelia CERBU Transilvania University Brașov Rezumat. În acestă lucrare, se analizează efectele umidităţii

More information

MONOLITHIC CONCRETE VS PRECAST CONCRETE FOR THE CONSTRUCTION OF BRIDGE BY TH CANTILEVER METHOD

MONOLITHIC CONCRETE VS PRECAST CONCRETE FOR THE CONSTRUCTION OF BRIDGE BY TH CANTILEVER METHOD DOI: 10.1515/rjti-2015-0028 ROMANIAN JOURNAL MONOLITHIC CONCRETE VS PRECAST CONCRETE FOR THE CONSTRUCTION OF BRIDGE BY TH CANTILEVER METHOD Dumitru Daniel Morlova, Assistant Eng. UTCB CFDP, daniel morlova@yahoo.com

More information

INFLUENCE OF THE WATER CEMENT RATIO ON THE UNCONFINED COMPRESSIVE STRENGTH OF A ROMANIAN SILT TREATED WITH PORTLAND CEMENT

INFLUENCE OF THE WATER CEMENT RATIO ON THE UNCONFINED COMPRESSIVE STRENGTH OF A ROMANIAN SILT TREATED WITH PORTLAND CEMENT BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI Publicat de Universitatea Tehnică Gheorghe Asachi din Iaşi Volumul 62 (66), Numărul 4, 2016 Secţia CONSTRUCŢII. ARHITECTURĂ INFLUENCE OF THE WATER CEMENT RATIO

More information

ASSPECTS CONCERNING THE IMPROVEMENT OF SOILS AGAINST LIQUEFACTION

ASSPECTS CONCERNING THE IMPROVEMENT OF SOILS AGAINST LIQUEFACTION BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI Publicat de Universitatea Tehnică Gheorghe Asachi din Iaşi Tomul LVI (LX), Fasc. 3, 2010 Secţia CONSTRUCŢII. ĂRHITECTURĂ ASSPECTS CONCERNING THE IMPROVEMENT OF

More information

Expert System for Assessing the Effluent s Quality of a Wastewater Treatment Plant

Expert System for Assessing the Effluent s Quality of a Wastewater Treatment Plant BULETINUL Universităţii Petrol Gaze din Ploieşti Vol. LXII No. 2/2010 36-45 Seria Matematică - Informatică - Fizică Expert System for Assessing the Effluent s Quality of a Wastewater Treatment Plant Mădălina

More information

Dual-Steel Eccentrically Braced Frames with Bolted Links Simulation of Safe Removal Process

Dual-Steel Eccentrically Braced Frames with Bolted Links Simulation of Safe Removal Process Acta Technica Napocensis: Civil Engineering & Architecture Vol. 56, No. 2 (213) Journal homepage: http://constructii.utcluj.ro/actacivileng Special Issue: First International Conference for PhD Students

More information

EXPERIMENTAL DETERMINATION OF HEAT LOSSES FOR A BURIED TRANSPORT PIPELINE IN NON-ISOTHERMAL STATE

EXPERIMENTAL DETERMINATION OF HEAT LOSSES FOR A BURIED TRANSPORT PIPELINE IN NON-ISOTHERMAL STATE Bulletin of the Transilvania University of Braşov Vol. 2 (51) - 2009 Series I: Engineering Sciences EXPERIMENTAL DETERMINATION OF HEAT LOSSES FOR A BURIED TRANSPORT PIPELINE IN NON-ISOTHERMAL STATE C.

More information

ACTA TECHNICA NAPOCENSIS

ACTA TECHNICA NAPOCENSIS 335 TECHNICAL UNIVERSITY OF CLUJ-NAPOCA ACTA TECHNICA NAPOCENSIS Series: Applied Mathematics, Mechanics, and Engineering Vol. 59, Issue III, September, 2016 STUDIES AND INVESTIGATIONS REFERRING TO THE

More information

Structural stability is the fundamental security criterion for buildings both during their functioning period and construction life. The present draft

Structural stability is the fundamental security criterion for buildings both during their functioning period and construction life. The present draft Mircea I. Cristutiu *1, Luis D. Nunes 2 1 Politehnica University of Timisoara, Faculty of Architecture. 2 T. Lalescu Str., 300223, Timisoara, Romania 2 Politehnica University of Timisoara, Faculty of Civil

More information

materiale plastice The new Bosch stepdrillbits made in Switzerland Foto tauschen mit Bosch-Range NOU! Burghie in trepte Precizie elvetiana

materiale plastice The new Bosch stepdrillbits made in Switzerland Foto tauschen mit Bosch-Range NOU! Burghie in trepte Precizie elvetiana Step Solutia drill bits pentru Swiss gaurire precision made rapida in St. in Niklaus metal, (NiP) inox si materiale plastice The new Bosch stepdrillbits made in Switzerland Foto tauschen mit Bosch-Range

More information

Oferta de pret pentru tocatoare deseuri lemnoase -Chippers & Shredders TW125PH Pret Tip

Oferta de pret pentru tocatoare deseuri lemnoase -Chippers & Shredders TW125PH Pret Tip Oferta de pret pentru tocatoare deseuri lemnoase -Chippers & Shredders TW125PH Pret Tip Vanzare Oferta de pret Seria: Gravity Feed / Alimentare prin cadere Nr. : TW13/75 G Data: TW18/100 G Hydraulic Feed

More information

MAGNETIC CHARACTERISTICS OF NON-ORIENTED SILICON IRON STRIPS

MAGNETIC CHARACTERISTICS OF NON-ORIENTED SILICON IRON STRIPS MAGNETIC CHARACTERISTICS OF NON-ORIENTED SILICON IRON STRIPS OBTAINED THROUGH MECHANICAL, LASER, ELECTRICAL DISCHARGE AND WATER JET CUTTING TECHNOLOGIES Horia GAVRILĂ 1,2, Veronica MĂNESCU (PĂLTÂNEA) 2,

More information

OBTAINING AND CHARACTERIZATION OF Al/Al 2 O 3 /Gr COMPOSITES BY MECHANICAL ALLOYING

OBTAINING AND CHARACTERIZATION OF Al/Al 2 O 3 /Gr COMPOSITES BY MECHANICAL ALLOYING U.P.B. Sci. Bull., Series B, Vol. 74, Iss. 2, 2012 ISSN 1454-2331 OBTAINING AND CHARACTERIZATION OF Al/Al 2 O 3 /Gr COMPOSITES BY MECHANICAL ALLOYING Gheorghe IACOB 1, Gabriela POPESCU 2, Florin MICULESCU

More information

Dan Paul Georgescu 1. B-dul Lacul Tei nr.124, Sector 2, Bucureşti, România

Dan Paul Georgescu 1. B-dul Lacul Tei nr.124, Sector 2, Bucureşti, România Revista Română de Inginerie Civilă, Volumul 4 (2013), Numărul 1 Matrix Rom Cercetari experimentale privind utilizarea adaosurilor de zgura granulata de furnal in beton. Cercetari experimentale pentru determinarea

More information

DECREASING SEISMIC EFFECTS OF STRUCTURES USING BASE ISOLATION SYSTEMS

DECREASING SEISMIC EFFECTS OF STRUCTURES USING BASE ISOLATION SYSTEMS BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI Publicat de Universitatea Tehnică Gheorghe Asachi din Iaşi Tomul LX (LXIV), Fasc. 2, 2014 Secţia CONSTRUCŢII. ARHITECTURĂ DECREASING SEISMIC EFFECTS OF STRUCTURES

More information

APPLYING MARINE STRATEGY FRAMEWORK DIRECTIVE (MSFD) FOR GOOD ENVIRONMENT STATE (GES) ASSESSMENT AT THE ROMANIAN BLACK SEA COAST

APPLYING MARINE STRATEGY FRAMEWORK DIRECTIVE (MSFD) FOR GOOD ENVIRONMENT STATE (GES) ASSESSMENT AT THE ROMANIAN BLACK SEA COAST APPLYING MARINE STRATEGY FRAMEWORK DIRECTIVE (MSFD) FOR GOOD ENVIRONMENT STATE (GES) ASSESSMENT AT THE ROMANIAN BLACK SEA COAST Abstract. The paper relates primarily to marine ecological issues; it is

More information

35 m LARGE OPENING ROOF STRUCTURAL SYSTEM MADE OF HOT ROLLED AND COLD FORMED STEEL PROFILES

35 m LARGE OPENING ROOF STRUCTURAL SYSTEM MADE OF HOT ROLLED AND COLD FORMED STEEL PROFILES BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI Publicat de Universitatea Tehnică Gheorghe Asachi din Iaşi Volumul 64 (68), Numărul 2, 2018 Secţia CONSTRUCŢII. ARHITECTURĂ 35 m LARGE OPENING ROOF STRUCTURAL

More information

IMPROVING VERIFICATION METHODOLOGIES IN DIGITAL CIRCUITS MODELING

IMPROVING VERIFICATION METHODOLOGIES IN DIGITAL CIRCUITS MODELING U.P.B. Sci. Bull., Series C, Vol. 74, Iss. 2, 2012 ISSN 1454-234x IMPROVING VERIFICATION METHODOLOGIES IN DIGITAL CIRCUITS MODELING Iulian NIŢĂ 1, Adrian RAPAN 2 Evoluţia tehnologică aduce noi avantaje

More information

Principles to calculate and verify continuous foundations consolidations

Principles to calculate and verify continuous foundations consolidations Acta Technica Napocensis: Civil Engineering & Architecture Volume 59, No. 2, (2016) Journal homepage: http://constructii.utcluj.ro/actacivileng ISSN 1221-5848 Principles to calculate and verify continuous

More information

EFFECT OF CONFINEMENT ON BOND STRENGTH BETWEEN SELF-COMPACTING CONCRETE AND REINFORCEMENT

EFFECT OF CONFINEMENT ON BOND STRENGTH BETWEEN SELF-COMPACTING CONCRETE AND REINFORCEMENT BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI Publicat de Universitatea Tehnică Gheorghe Asachi din Iaşi Tomul LIX (LXIII), Fasc. 1, 2013 Secţia CONSTRUCŢII. ARHITECTURĂ EFFECT OF CONFINEMENT ON BOND STRENGTH

More information

A. TITLUL COMPLET AL PROIECTULUI:

A. TITLUL COMPLET AL PROIECTULUI: A. TITLUL COMPLET AL PROIECTULUI: REALIZAREA UNUI MODEL INTEGRAT DE EVALUARE GLOBALĂ COMBINÂND ANALIZA CICLULUI DE VIAŢĂ, ANALIZA ECONOMICĂ ŞI INDICATORI ENERGETICI ÎN CAZUL REŢINERII ŞI STOCĂRII DE CO

More information

INFLUENCE OF THE PARAMETERS PREHEATING TEMPERATURE AND LINEAR ENERGY ON THE MICROGRAPHIC AND MACROGRAPHIC CHARACTERISTICS OF WELDED JOINTS

INFLUENCE OF THE PARAMETERS PREHEATING TEMPERATURE AND LINEAR ENERGY ON THE MICROGRAPHIC AND MACROGRAPHIC CHARACTERISTICS OF WELDED JOINTS U.P.B. Sci. Bull., Series D, Vol. 71, Iss. 2, 2009 ISSN 1454-2358 INFLUENCE OF THE PARAMETERS PREHEATING TEMPERATURE AND LINEAR ENERGY ON THE MICROGRAPHIC AND MACROGRAPHIC CHARACTERISTICS OF WELDED JOINTS

More information

REHABILITATION OF MASONRY BUILDINGS USING SEISMIC ISOLATION SYSTEMS IN THE BASE CASE STUDY

REHABILITATION OF MASONRY BUILDINGS USING SEISMIC ISOLATION SYSTEMS IN THE BASE CASE STUDY BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI Publicat de Universitatea Tehnică Gheorghe Asachi din Iaşi Tomul LX (LXIV), Fasc. 3, 2014 Secţia CONSTRUCŢII. ARHITECTURĂ REHABILITATION OF MASONRY BUILDINGS

More information

INCREASING COMPETITIVENESS OF SMALL AND MEDIUM ENTREPRISES BY APPLICATION OF THE VALUE ENGINEERING IN PRODUCT DESIGN

INCREASING COMPETITIVENESS OF SMALL AND MEDIUM ENTREPRISES BY APPLICATION OF THE VALUE ENGINEERING IN PRODUCT DESIGN U.P.B. Sci. Bull., Series D, Vol. 70, No. 2, 2008. ISSN 1454-2358 INCREASING COMPETITIVENESS OF SMALL AND MEDIUM ENTREPRISES BY APPLICATION OF THE VALUE ENGINEERING IN PRODUCT DESIGN Ion IONIŢĂ 1, RalucA

More information