Dissertations / Theses on the topic 'Chemical processes'
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Li, Fanxing. "CHEMICAL LOOPING GASIFICATION PROCESSES." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1236704412.
Full textLai, Sau Man. "Feasibility and flexibility in chemical process design /." View abstract or full-text, 2009. http://library.ust.hk/cgi/db/thesis.pl?CBME%202009%20LAI.
Full textSmith, G. J. "Dynamic simulation of chemical processes." Thesis, University of Cambridge, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372635.
Full textFew, Julian William. "FTIR studies of chemical processes." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:b7dbc587-fb9e-46de-8f04-44892fde0bf4.
Full textSingh, Lakhbinder. "Dynamic simulation of chemical processes." Thesis, Aston University, 1991. http://publications.aston.ac.uk/9731/.
Full textInamdar, S. R. "Global optimization of chemical processes." Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 2012. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/2142.
Full textYan, Ming. "Multi-objective, plant-wide control and optimization of chemical processes /." Thesis, Connect to this title online; UW restricted, 1996. http://hdl.handle.net/1773/9918.
Full textWeikel, Ross R. "Physical Transformations for Greener Chemical Processes." Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/11654.
Full textKondili, Emilia. "Optimal scheduling of batch chemical processes." Thesis, Imperial College London, 2011. http://hdl.handle.net/10044/1/8853.
Full textYdstie, Birger Erik. "Robust adaptive control of chemical processes." Thesis, Imperial College London, 2011. http://hdl.handle.net/10044/1/8295.
Full textMorrell, Claire. "FTIR emission studies of chemical processes." Thesis, University of Oxford, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.326026.
Full textSozio, John Charles. "Intelligent Parameter Adaptation for Chemical Processes." Thesis, Virginia Tech, 1999. http://hdl.handle.net/10919/34089.
Full textMaster of Science
Shen, Gwo-Chyau. "Adaptive inferential control for chemical processes /." The Ohio State University, 1987. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487329662147068.
Full textChaudhary, Muhammad Nadeem Rafique. "Real time optimization of chemical processes." Thesis, Curtin University, 2009. http://hdl.handle.net/20.500.11937/1419.
Full textFien, Gert-Jan A. F. "Studies on process synthesis and process integration." Diss., This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-08032007-102242/.
Full textShi, Ruijie. "Subspace identification methods for process dynamic modeling /." *McMaster only, 2001.
Find full textPadley, Mark Andrew. "Incorporating operability measures into the process synthesis stage of design." Phd thesis, Department of Chemical Engineering, 1991. http://hdl.handle.net/2123/5996.
Full textEggersmann, Markus. "Analysis and support of work processes within chemical engineering design processes /." Düsseldorf : VDI-Verl, 2005. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=013342934&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.
Full textAmale, Amit. "New approach to the design and optimization on energy efficient chemical processes /." View online ; access limited to URI, 2008. http://0-digitalcommons.uri.edu.helin.uri.edu/dissertations/AAI3314439.
Full textJarvis, Richard Barry. "Robust dynamic simulation of chemical engineering processes." Thesis, Imperial College London, 1993. http://hdl.handle.net/10044/1/7309.
Full textSaunders, Mark. "Chemical processes studied by time-resolved FTIR." Thesis, University of Oxford, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.491975.
Full textMorrison, Marc. "Chemical processes studied by time resolved FTIR." Thesis, University of Oxford, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.414235.
Full textOum, Kawon. "Laser studies of gas phase chemical processes." Thesis, University of Oxford, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318810.
Full textPapazoglou, Michael. "Multivariate statistical process control of chemical processes." Thesis, University of Newcastle Upon Tyne, 1998. http://hdl.handle.net/10443/408.
Full textHong, Tao. "Non-linear predictive control of chemical processes." Thesis, University of Newcastle Upon Tyne, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245078.
Full textZhu, Kechen, and Kechen Zhu. "Chemical and Microbial Processes for Rhodium Recovery." Thesis, The University of Arizona, 2017. http://hdl.handle.net/10150/625349.
Full textRashid, Muhammad. "Stability and dynamic operability analysis of chemical processes." Title page, table of contents and abstract only, 1988. http://web4.library.adelaide.edu.au/theses/09ENS/09ensr224.pdf.
Full textHamann, Stephan [Verfasser]. "On aspects of chemical processes in surface modification plasma processes / Stephan Hamann." Greifswald : Universitätsbibliothek Greifswald, 2015. http://d-nb.info/1080392726/34.
Full textBai, Shuanghua. "Data reconciliation for dynamic processes." Thesis, University of Ottawa (Canada), 2006. http://hdl.handle.net/10393/29279.
Full textSharma, Sandeep Ph D. Massachusetts Institute of Technology. "Predictive modeling of combustion processes." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/54583.
Full textCataloged from PDF version of thesis.
Includes bibliographical references (p. 161-169).
Recently, there has been an increasing interest in improving the efficiency and lowering the emissions from operating combustors, e.g. internal combustion (IC) engines and gas turbines. Different fuels, additives etc. are used in these combustors to try to find the optimal operating conditions and fuel combination which gives the best results. This process is ad-hoc and costly, and the expertise gained on one system cannot easily be transfered to other situations. To improve this process a more fundamental understanding of chemistry and physical processes is required. The fundamental constants like rate coefficients of elementary reactions are readily transferable enabling us to use results from one set of experiments or calculations in a different situation. In our group we have taken this approach and developed the software Reaction Mechanism Generator (RMG), which generates chemical mechanism for oxidation and pyrolysis of a given fuel under a set of user-defined physical conditions. RMG uses group additivity values to generate thermochemistry of molecules and has a database of rate coefficients of elementary reactions. These two sets of data are used to generate chemical kinetic mechanism in a systematic manner. The reaction mechanisms generated by RMG are purely predictive and elementary rate coefficient from any reliable source can be added to RMG database to improve the quality of its predictions. The goal of my thesis was two fold, first to extend the capabilities and database of RMG and to release it as an open source software for the chemical kinetic community to use.
(cont.) The second was to take a practical system of interest and use RMG to generate the chemical mechanism and thereby demonstrate the utility of RMG in generating predictive chemical mechanisms for practical situations. As a part of the second step our hope was to generate new chemical insights into soot formation processes which are of great interest. The three most important contributions of the thesis are listed below. 1. My work with RMG has resulted in order of magnitude improvements in the cpu and memory usage of RMG and it has added many useful features to RMG like ac- curate sensitivity analysis for better interpreting the final mechanism. I have also worked on extending the database of RMG, by adding thermochemistry of ringed species that cannot be treated adequately by group additivity. Also kinetic rate rules for intramolecular-H-migration reactions in OOQOOH molecules were added to RMG database, which are important in predicting the low temperature oxidation of alkanes. 2. Recently there have been considerable advances in the methodology for rate coefficient calculations for loose transition states, i.e transition states that are not saddle points. These type of transition states are encountered often in radical-radical reactions. In addition to these advances there has been significant progress in accurate calculation of the pressure dependent rate coefficients for complicated potential energy surfaces with multiple wells and multiple product channels. The method is based on the master equation formulation of the problem. These detailed equations are then appropriately coarse-grained to calculate the phenomenological rate coefficients.
(cont.) I have used these state of the art techniques to calculate the rate coefficients for the formation of various aromatic species like benzene and styrene. The rate coefficients predicted by these methods were tested under certain conditions and are in good agreement with experimental data. 3. Finally to model a two-dimensional diffusion flame we have developed a solver that is able to solve a complicated set of highly coupled differential equations in an efficient manner to give accurate results. The solver in conjunction with chemistry that is developed using techniques mentioned in the last two points is used to solve the mole fraction profiles in the diffusion flame. The results of the simulations are compared to the experimental measurements and this process gives us insight into soot formation in diffusion flames.
by Sandeep Sharma.
Ph.D.
Merchant, Tushar Praful. "Modelling of rapid thermal processes." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/11784.
Full textLloyd, Michael C. "Novel materials for membrane separation processes." Thesis, Aston University, 1995. http://publications.aston.ac.uk/9680/.
Full textFranklin, Valerie J. "Lipoidal species in ocular spoilation processes." Thesis, Aston University, 1990. http://publications.aston.ac.uk/9738/.
Full textLamb, David R. "New reaction systems for environmentally conscious chemical processes." Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/30075.
Full textRuedisueli, Robert Louis. "Cyclically optimized electrochemical processes /." Thesis, Connect to this title online; UW restricted, 1997. http://hdl.handle.net/1773/10576.
Full textAlpay, Esat. "Rapid pressure swing adsorption processes." Thesis, University of Cambridge, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.333256.
Full textPeterson, Andrew A. "Biomass reforming processes in hydrothermal media." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/51678.
Full textThis electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Includes bibliographical references (p. 240-258).
While hydrothermal technologies offer distinct advantages in being able to process a wide variety of biomass feedstocks, the composition of the feedstock will have a large effect on the processing employed. This thesis characterizes the role of two major components of biomass, salts and proteins, that if dealt with intelligently can create valuable byproducts, but if dealt with inefficiently can cause processes to fail or run sub-optimally. In supercritical-water, most ionic species exhibit only sparing solubility. Thus, in the supercritical-water gasification of biomass, a supercritical-water reverse-flow vessel (RFV) may be employed to precipitate the salts from the biomass before the biomass is brought into contact with catalysts. However, these vessels are subject to blockage, and flow characterization within the vessels has largely been unknown. Therefore, the technique of neutron radiography is introduced to the supercritical-water processing field in order to characterize the behavior within these RFVs. This allows for non-invasive, in situ, real-time measurements of precipitation phenomena within thick-walled vessels. Two methods that provide complimentary information were developed to observe the precipitation behavior of salts from supercritical water. In the first method ("normalphase" radiography), the salts have a lower attenuation coefficient than the continuous 1H2O phase. This allowed for the visualization of major blockages, buildups of salts at the walls, and flow pattern changes. By using the strongly attenuating 1H2O form of water, fluid density changes resulting from flow pattern changes were also apparent.
(cont.) In the second method ("reverse-phase" radiography), strongly attenuating salts, such as those containing boron, were employed in a continuous phase of D2O, which has a weak neutron attenuation coefficient. In this manner, the onset of precipitation events could be seen with finer resolution. The neutron radiographical method was also employed to perform an elegant 1H2Oin-D2O tracer study of the fluid mechanics within the RFV, in which a stream of water that spans its critical temperature undergoes a reversing flow pattern. The flow was found to penetrate deep into the vessel and to mix thoroughly with the contents of the vessel, presumably because of the strong buoyant forces generated by heat at the walls. In the absence of wall heating, the flow was observed to reverse at a point much nearer to the top of the vessel. Also, as compared to comparable conditions at subcritical pressures, the supercritical jet was found to be more diffuse and to penetrate the vessel at a lower velocity. A jet entrainment model was derived to describe the flow within the vessel. Due to the near-critical conditions in the vessel, the model was developed without the Boussinesq approximation or the density deficiency formulation commonly applied to such models. The model was solved numerically and was found to provide excellent agreement with the neutron radiographical data for the two cases studied: an isothermal case and a case in which the temperatures spanned the critical point of water. In the isothermal limit, the model accurately predicted the jet reversal point.
(cont.) In the case with temperatures that spanned the critical point, the model accurately predicted that the jet would not fully reverse before reaching the bottom of the vessel. The model also predicted the characteristic decay time of a tracer within the vessel with near-perfect accuracy. Proteins are a second constituent of biomass that require special treatment in the development of hydrothermal processes. Industrial and research laboratory reports have indicated that the presence of proteins may create processing conditions that lead to equipment fouling and reduced gasification yields in hydrothermal processing. In studies on the interaction between glycine and glucose as model compounds at 250C and 10 MPa, strong kinetic and qualitative evidence is presented that a Maillard-type reaction occurs in hydrothermal processing. This reaction, which is very common at the lower temperatures encountered in food and medicinal chemistry, is known to lead to the formation of polymeric material that may be desirable for color and flavor generation in food processing, but is generally undesirable in hydrothermal processing, since these polymers will act to foul process equipment. Glucose and glycine were found to strongly influence the reaction pathway of the other compound, and the resulting reactor effluent had UV absorbances typical of Maillard reaction products. Compounds with the same functional groups, a primary amine and a carbonyl group, were substituted for glucose and glycine and were found to have similar effects.
(cont.) Also, the degradation pathway of glucose was found to be altered, with the significant product hydroxymethylfurfural being suppressed with the addition of glycine. The reactive form of glucose is the acyclic, aldehydoglucose form. Glucose can also exist as an unreactive, cyclic form, which dominates at room temperature, making up over 99.99% of the aqueous equilibrium composition. However, this equilibrium is unknown at elevated temperatures and pressures. A preliminary computational chemistry study was undertaken to predict this equilibrium under hydrothermal conditions. The acyclic form was predicted to rise to be of comparable prevalence to the cyclic forms. The study indicates that this was caused by two main effects, a change in the relative stability imparted by the decreased dielectric constant of water, and by an entropic effect in which the much larger number of conformers that are possible in the acyclic state become more energetically populated at higher temperatures.
by Andrew A. Peterson.
Ph.D.
Mehrabi, M. Reza. "Modeling transport processes in directional solidification." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/11999.
Full textYang, Ming Ph D. Massachusetts Institute of Technology. "Stochastic processes in T-cell signaling." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/76488.
Full textCataloged from PDF version of thesis.
Includes bibliographical references (p. 89-93).
T cells are orchestrators for adaptive immunity. Antigen recognition by T cells is mediated by the interactions between T-cell receptors (TCRs) and peptide-MHC (pMHC) molecules. How T cells can translate stimulatory external cues (e.g., TCRpMHC interactions where the peptides are derived from foreign proteins) to functional responses (e.g., proliferation), while not responding to self-pMHC has been a puzzle for decades. The ability to discriminate foreign antigens from self antigens demands extraordinary intricacy for the design and operation of signaling pathways. This problem is a special challenge since fluctuations at the microscopic level are ubiquitous in biochemical networks, due to stochastic nature of reactions and uncertainties in protein expressions. The prevalence of noise imposes further challenges for T cells to deliver biological functions reliably. The overarching theme of this thesis is to understand the role of stochasticity in T-cell signaling. Four problems have been selected for presentation in this thesis: 1. Fluctuation-driven transitions can drive cellular systems out of stable states and lead to spurious responses. We proposed a theoretical and computational framework to identify key reactions or species that are responsible for regulating such stochastic transitions. The identification of these critical components for network stability not only pinpoints key deleterious protein mutations, but also helps intelligently select drug targets. The semi-analytical method we derived using large-deviation theory and calculus of variations agrees well with computational costly brute-force simulations. Additionally, our framework unveils qualitative characteristics of key reactions regulating stochastic transitions. We believe that we have developed the first method to carry out fully stochastic sensitivity analyses using analytical calculations. 2. In collaboration with Dr. Jeroen Roose's lab at UCSF, we investigated the roles of RasGRP and SOS in the activation of ERK and P38 MAP kinase pathways. We extended established computational models developed in our lab and predicted that SOS' allosteric pocket is important for the magnitude and bimodal pattern of ERK activation, which was confirmed experimentally. The synergy between computational modeling and experimental studies enabled us to propose mechanistic models that incorporate features such as co-operativity and non-linearity thresholding to study P38 activation. These models were consistent with the experimental findings that SOS is preferentially more important than RasGRP for Rac-P38 activation and SOS' allosteric pocket has little effect on Rac-P38 pathways, and also generated numerous experimentally testable hypotheses. 3. While rare events, such as escapes from stable basins, take a long time (waiting time) to occur, they take little time to complete once they have started. We showed that for Markov processes characterized by detailed balance, successful transitions, on average, complete exactly as quickly as transitions in the opposite (non-rare) direction. We first provide a general proof by invoking time reversibility, and then elaborate the proof by considering two specific dynamics, namely, continuous-time Markov Chains with detailed balance and one-dimensional Langevin Dynamics. We employ ideas from measure theory and stochastic calculus. We conclude that rare events, once they happen, happen quickly, and speculate about extensions to nonequilibrium systems, such as viral escape. 4. While microscopic fluctuations complicate reliable functioning of biochemical networks, stochastic noise also offers enormous information about the underlying network that generates such noise. We present an effort to exploit the non-random structure of random noise for network topology identification. In particular, we applied linear noise approximations to two three-node network motifs, namely, incoherent feed-forward loop (IFF) and negative feedback loop (NFB), and obtained correlation functions governing the fluctuations of species copy numbers at steady state. We identified two signatures that can be used to discriminate IFF from NFB. This endeavor represents a first step toward understanding how, and to what extent, time-series data with fine time and length resolutions can be used to infer network structures.
by Ming Yang.
Ph.D.
Crowther, Timothy Guy. "Application of chemical acoustic emission to industrial processes." Thesis, University of British Columbia, 1991. http://hdl.handle.net/2429/29804.
Full textScience, Faculty of
Chemistry, Department of
Graduate
Zhu, Jianye. "Integrated process design and control of chemical processes." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0009/NQ34864.pdf.
Full textHocking, Damien. "Object-oriented simulation of chemical and biochemical processes /." Title page and contents only, 1997. http://web4.library.adelaide.edu.au/theses/09PH/09phh6847.pdf.
Full textAmaya, John. "Numerical study of combustion chemical vapor deposition processes." Thesis, Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/12991.
Full textGrunnet-Jepsen, Helene. "A fundamental study of foaming in chemical processes." Thesis, University of Oxford, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.389215.
Full textHorne, Simon James. "A novel hybrid approach to modeling chemical processes." Thesis, University of Newcastle Upon Tyne, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.531756.
Full textKandiah, Sivasothy. "Fuzzy model based predictive control of chemical processes." Thesis, University of Sheffield, 1996. http://etheses.whiterose.ac.uk/3029/.
Full textAl-Alawi, Ahmed. "Dynamic modelling and performance monitoring of chemical processes." Thesis, University of Newcastle Upon Tyne, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.427331.
Full textWheeler, J. "Physical and chemical processes in ductile shear zones." Thesis, University of Leeds, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.375358.
Full textDavison, Suzanne Elizabeth Lisa Kimm. "Chemical processes accompanying the autoxidation of paint films." Thesis, Royal Holloway, University of London, 1989. http://repository.royalholloway.ac.uk/items/ccb898a1-2fd5-4866-b895-b07031332ef3/1/.
Full textChen, Wei-Chen Kuppermann Aron Marcus R. A. "Isotope effects in chemical processes of atmospheric interest /." Diss., Pasadena, Calif. : California Institute of Technology, 2009. http://resolver.caltech.edu/CaltechETD:etd-01222009-173227.
Full text