<p><strong>Apstrakt je obrađen tehnologijama za optičko prepoznavanje teksta (OCR).</strong></p><p>Cilj ovog rada je teorijska (računarska) analiza primenljivosti dvomembranskog reaktora za izvodenje povratnih gasnih reakcija. Specijalno, analizira se primenljivost dvomern- branske konhguracije za termolizu vode. Rezultati simulacije su pokazali značajnu pred- nost, u pogledu povečanja konverzije reaktanta iznad ravnotežne, dvomembranske u odnosu na jednomembransku konhguraciju, u slučaju kada su membrane najmanje pro- pustljive za reaktant. Rezultati neizotermske analize dvomembranskog reaktora su pokazali da je efekat energije aktivacije u odnosu na efekat toplote reakcije zanemarljiv, u oblasti vehkih Damk&ouml;hler-ovih brojeva (odnos maksimalne brzine reakcije i protoka reaktanta u napoju). I za endotermne i za egzotermne reakcije, konverziona efikasnost opada sa porastom indeksa generisanja toplote (odnos toplotnog efekta reakcije i toplotnog kapaciteta reaktanta), a raste sa intenzitetom dovodenja odnosno odvodenja toplote. &Scaron;to se tiče uticaja temperature napoja, kod endotermnih reakcija postoji optimum ako permeabilnosti komponenata opadaju sa temperaturom. Na bazi raspoloživih literaturnih podataka formulisan je izotermski model dvomembranskog reaktora za termolizu vode sa jednom membranom propustljivom za vodonik, a drugom propustljivom za kiseonik. Pokazano je da se pri dovoljno velikim vrednostima Damk&ouml;hler-ovih broja i odnosa brzina (odnos maksimalne brzine permeacije za membranu i maksimalne brzine reakcije) u reaktoru može postići potpuna disocijacija vode. Zapaženo je postojanje optimalne raspodele ukupnog odnosa brzina izmedu dve membrane kao i, u slučaju uvodenja inerta u separacionu zonu, optimalne raspodele inerta između dve zone. Analiza je pokazala da dvomembranski reaktor predstavlja perspektivno re&scaron;enje problema termolize vode koje zaslužuje dalja teorijska i eksperimentaina istraživanja.</p> / <p><strong>Abstract was processed by technology for Optical character recognition (OCR).</strong></p><p>The aim of this study is a theoretical (computer) analysis of the applicability of a double-membrane reactor for reversible gas phase reactions. Particulaidy, the applicability of double-membrane configuration for the direct thermal water splitting is studied. The double-membrane configuration proved to be significantly superior over the single membrane configuration with respect to the equilibrium shift, in the case when the reac- tant is the slowest permeating component. By the non-isothermal analysis, it is shown that, in the region of high Damk&ouml;hler numbers (the ratio of the maximal reaction rate to the feed reactant flow), the effect of activation energy is negligible when compared to the effect of reaction heat. The conversion efficiency is decreasing by the increase of the heat generation index (the ratio of reaction heat to reactant heat capacity) and increasing by the increase of the added or removed heat, for both endo- and exothermic processes. As to the feed temperature, an optimal value exists for endothermic reactions, if component permeabilities are decreasing functions of temperature. On the basis of the available literature data, the isothermal model of double-membrane reactor (one membrane permeable for hydrogen an the other for oxygen) for direct thermal splitting of water is formulated. It is shown that the complete water dissociation could be achieved at the high enough values of Damk&ouml;hler number and of the rate ratio (the ratio of maximal permeability of membrane to the maximal reaction rate). The optimal distribution of the total rate ratio between the membranes as well as the optimal inert flow distribution could be determined. Double-membrane configuration seems to be a promising solution for the problem of direct thermal water splitting, deserving further theoretical and experimental investigations.</p>

Supply chain management has been recently introduced to address the integration of organizational functions ranging from the ordering and receipt of raw materials throughout the manufacturing processes, to the distribution and delivery of products to the customer. Its application demonstrates that this idea enables organizations to achieve higher quality products, better customer service, and lower inventory cost. In order to achieve high performance, supply chain functions must operate in an integrated and coordinated manner. Several challenging problems associated with integrated supply chain design are: (1) how to model and coordinate the supply chain business processes, specifically in the area of supply chain workflows; (2) how to analyze the performance of an integrated supply chain network so that optimization techniques can be employed to improve customer service and reduce inventory cost; and (3) how to evaluate dynamic supply chain networks and obtain a comprehensive understanding of decision-making issues related to supply network configurations. These problems are most representative in the supply chain theory's research and applications. There are three major objectives for this research. The first objective is to develop viable modeling methodologies and analyzing algorithms for supply chain business processes so that the logic properties of supply chain process models can be analyzed and verified. This problem has not been studied in integrated supply chain literature to date. To facilitate the modeling and verification analysis of supply chain workflows, an object-oriented Petri nets based modular modeling and analyzing approach is presented. The proposed, structured, process-modeling algorithm provides an effective way to design structured supply chain business processes. The second objective is to develop a network of inventory-queue models for the performance analysis and optimization of an integrated supply network with inventory control at all sites. An inventory-queue is a queueing model that incorporates an inventory replenishment policy for the output store. This dissertation extends the previous work done on the supply network model with base-stock control and service requirements. Instead of one-for-one base stock policy, batch-ordering policy and lot-sizing problems are considered. To determine the replenishment lead times of items at the stores, a fixed-batch target-level production authorization mechanism is employed to explicitly obtain performance measures of the supply chain queueing model. The validity of the proposed model is illustrated by comparing the results from the analytical performance evaluation model and those obtained from the simulation study. The third objective is to develop simulation models for understanding decision-making issues of the supply chain network configuration in an integrated environment. Simulation studies investigate multi-echelon distribution systems with installation stock reorder policy and echelon stock reorder policy. The results show that, depending on the structure of multi-echelon distribution systems, either echelon stock or installation stock policy may be advantageous. This dissertation presents a new transshipment policy, called "alternate transshipment policy," to improve supply chain performance. In an integrated supply chain network that considers both the distribution function and the manufacturing function, the impacts of component commonality on network performance are also evaluated. The results of analysis-of-variance and Tukey's tests reveal that there is a significant difference in performance measures, such as delivery time and order fill rates, when comparing an integrated supply chain with higher component commonality to an integrated supply chain with lower component commonality. Several supply chain network examples are employed to substantiate the effectiveness of the proposed methodologies and algorithms. / Ph. D.