224 research outputs found
A szervezeti innováció és tudásfelhasználás mintái a magyar gazdaságban = Patterns of organisational innovation and knowledge use in the Hungarian economy
Az államszocializmus bukását követĹ‘ Ă©vtizedek mĂ©rlegĂ©t megvonva egyĂ©rtelműen látszik, hogy nem sikerĂĽlt az akkor remĂ©lt felzárkĂłzás a fejlett országokhoz. A jelenlegi helyzetbĹ‘l valĂł kilábalás egyik lehetsĂ©ges modellje lehetne olyan Ăşj fejlĹ‘dĂ©si pályák kialakĂtása, amelyek az innováciĂłn Ă©s a nagy hozzáadott Ă©rtĂ©kű gazdasági tevĂ©kenysĂ©gek rĂ©szarányának növelĂ©sĂ©n alapulnak. Ennek a forgatĂłkönyvnek azonban ellentmondani látszik, hogy a magyar gazdaság innováciĂłs teljesĂtmĂ©nye elmarad az eurĂłpai átlagtĂłl. AlapvetĹ‘ kĂ©rdĂ©s, hogy mi az oka a lemaradásunknak?
Az ország innováciĂłs teljesĂtmĂ©nyĂ©nek alakulásában kulcsszerepe van a vállalati szfĂ©ra innováciĂłs erĹ‘feszĂtĂ©seinek. DisszertáciĂłmban arra tettem kĂsĂ©rletet, hogy a magyar vállalati szfĂ©ra innováciĂłs teljesĂtmĂ©nyĂ©t Ă©s a magyar vállalatok innováciĂłs potenciálját meghatározĂł tĂ©nyezĹ‘ket vizsgáljam.
A szervezetek innováciĂłs kĂ©pessĂ©ge nagyban fĂĽgg abszorpciĂłs kĂ©pessĂ©gĂĽktĹ‘l, amely arra utal, hogy egy szervezet milyen mĂ©rtĂ©kben kĂ©pes felhasználni a szervezeten belĂĽli Ă©s kĂvĂĽli tudásokat. Az abszorpciĂłs kĂ©pessĂ©g a szervezetek által felhalmozott tudásvagyon, az intellektuális tĹ‘ke fĂĽggvĂ©nye. A legszĂ©lesebb körben elfogadott felosztás szerint az intellektuális tĹ‘ke három további összetevĹ‘bĹ‘l áll: a humán (emberi) tĹ‘kĂ©bĹ‘l, a strukturális (szervezeti) tĹ‘kĂ©bĹ‘l Ă©s a reláciĂłs (kapcsolati) tĹ‘kĂ©bĹ‘l.
A disszertáció közelebbi témája annak vizsgálata, hogy miként alakult az elmúlt időszakban a magyar vállalatok által felhalmozott intellektuális tőke egyes elemeinek mennyisége és minősége, különös tekintettel a humán és a strukturális tőke bizonyos elemire, illetve a köztük levő kapcsolatra. A kérdés vizsgálata egyúttal a magyar vállalatok innovációs potenciáljának mérésére is szolgál
Mobilizing Social and Organizational Resources in Project Type Cooperation
The paper aims at the identification and interpretation of specific coordination problems faced by project-based work organisations using the example of an interactive portal development for a leadingHungarian economic weakly. The study provides a brief overview of the most important theoretical approaches concerning project-based work organisations and the characteristics of the new or interactivemedia sector, which may act as a new model in the fast growing knowledge economy. The interactive portal development is typical of the so-called studio-model of project-based firms (PBF) characterised bythe novel and singular character of the product or service and by the uncertain and fluid nature of the necessary knowledge and skills. The study calls attention to the project manager’s key role in combiningformal and tacit skills and in the coordination of actors’ behaviour which is driven by different logics. In addition, the authors stress the importance of the client’s key role in designing and developing theinteractive media service.
JEL classifications: L86; M54; Z1
Predicting the friction factor in straight pipes in the case of Bingham plastic and the power-law fluids by means of measurements and CFD simulation
In the petroleum, food and energy industry, non-Newtonian fluids are widely used and their transport in pipelines can be highly expensive. When designing such systems, predicting the pressure drop for a given flow rate is of primary importance. In this paper, the friction factor in straight pipelines is studied experimentally and by means of Computational Fluid Dynamics (CFD) techniques in the case of power-law and the Bingham plastic fluids. First, the accuracy of the CFD technique is demonstrated in the case of water. Then, a power-law fluid (Carbopol 971 solution) is examined experimentally and numerically and it is confirmed that by introducing the modified Reynolds number given in [1], the classic friction factor formulae can be used. In the case of the Bingham plastic fluids, CFD simulations were performed and friction factor curves for several Hedström numbers are reported which were found to be consistent with the corresponding literature
Bingham-plasztikus közeg áramlása egyenes csőben: The flow of Bingham Plastic Fluids in a pipe
Non-Newtonian fluids are frequent in mechanical engineering practice, so it is important to understand their behaviour. This paper is about a specific type of non-Newtonian, the Bingham plastic fluids. We examine their flow in a straight pipe with numerical simulation, and compare the pressure drop value of the simulation with that of the literature formulas, thus evaluating the accuracy of the CFD model. Performing this exercise on different sand-grain roughness values we can understand which values are negligible. We summarize these results in Moody diagrams.
Kivonat
A nemnewtoni folyadĂ©kok a gĂ©pĂ©szmĂ©rnöki gyakorlatban gyakran megjelenĹ‘ közegek, Ăgy áramlástani viselkedĂ©sĂĽk megismerĂ©se kiemelten fontos. A dolgozat a nemnewtoni folyadĂ©kok Bingham-plasztikus tĂpusával foglalkozik. Numerikus szimuláciĂł segĂtsĂ©gĂ©vel vizsgáljuk a folyadĂ©k áramlását egyenes csĹ‘ben, majd a nyomásvesztesĂ©g lekĂ©rdezett Ă©s szakirodalom alapján számĂtott Ă©rtĂ©keit összevetve Ă©rtĂ©keljĂĽk a szimuláciĂł pontosságát. A vizsgálatot kĂĽlönbözĹ‘ Ă©rdessĂ©gű csövek esetĂ©n elvĂ©gezve kĂ©pet kaphatunk arrĂłl, hogy mely homokĂ©rdessĂ©g-Ă©rtĂ©k alatt tekinthetjĂĽk elhanyagolhatĂłnak a fali Ă©rdessĂ©get. EredmĂ©nyeinket Moody-diagramban foglaljuk össze
LDV measurements of Newtonian and non-Newtonian open-surface swirling flow in a hydrodynamic mixer
The aim of this paper is to study the cyclone-like flow inside a hydrodynamic mixer experimentally, with a special emphasis on the differences in the flow field in the case of Newtonian and non-Newtonian fluids. The mixer consists a cylindrical body with conical bottom, in which two, tangentially entering fluid jets drive the rotating motion of the fluid body. The two fluids are (1) water and (2) a Carbopol solution obeying power-law rheology. The circumferential and axial velocity distributions were measured with the help of LDV for several fluid levels and driving flow rates. We show that in the case of water, the velocity distributions are qualitatively similar for several flow rates if the fluid height is kept constant. In the case of the power-law fluid, the measured velocity profiles show less generality
The Effect of Rheology Model of an Activated Sludge on to the Predicted Losses by an Elbow
This study presents a numerical investigation of flow and rheological behaviour of activated sludge. These materials are usually driven by pumps in wastewater treatment plants. Because of the correct sizing of the pipeline systems, which is of great importance from the point of view of efficiency, the friction losses and loss coefficients of the components have to be known. These are well-known in the case of Newtonian fluids but few data are available if the rheological properties are non-Newtonian. Three non-Newtonian models (Ostwald, Bingham, Herschel-Bulkley) are investigated related to the friction factor of a straight pipe, the loss coefficients of an elbow and to the pressure drop on this element. For our study the rheological data were used from the literature, where the same sample origin was diluted or concentrated to achieve three different TSS (total suspended solids) contents for the same sludge (7.4 g/l; 6.2 g/l; 3.6 g/l). Moreover, modified Reynolds-number definitions are tested related to the non-Newtonian models in the case of the laminar, transition and turbulent regions
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