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Rozprawy doktorskie na temat „Reduction”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 25 lipca 2025

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1

France, Scott. "Biocatalytic imine reduction and reductive amination." Thesis, University of Manchester, 2018. https://www.research.manchester.ac.uk/portal/en/theses/biocatalytic-imine-reduction-and-reductive-amination(61ad6339-617a-425e-9063-1a2a57c8540f).html.

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Chiral amine motifs are found in many bioactive compounds and therefore strategies for their direct asymmetric synthesis are of great interest. Alongside traditional chemical methods, biocatalysis serves as an important tool for the formation of these compounds that can confer the benefits of sustainable catalyst supply and mild reaction conditions. This thesis describes the application of imine reductase (IRED) biocatalysts for the asymmetric reduction of pre-formed imines and the reductive amination of carbonyl compounds to produce chiral amines. These enzymes are relatively recent additions

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Ju, Xiumin. "Reductive Dehalogenation of Gas-phase Trichloroethylene using Heterogeneous Catalytic and Electrochemical Methods." Diss., Tucson, Arizona : University of Arizona, 2005. http://etd.library.arizona.edu/etd/GetFileServlet?file=file:///data1/pdf/etd/azu%5Fetd%5F1366%5F1%5Fm.pdf&type=application/pdf.

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Baldiwala, Aliakbar. "Dimensionality Reduction for Commercial Vehicle Fleet Monitoring." Thesis, Université d'Ottawa / University of Ottawa, 2018. http://hdl.handle.net/10393/38330.

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A variety of new features have been added in the present-day vehicles like a pre-crash warning, the vehicle to vehicle communication, semi-autonomous driving systems, telematics, drive by wire. They demand very high bandwidth from in-vehicle networks. Various electronic control units present inside the automotive transmit useful information via automotive multiplexing. Automotive multiplexing allows sharing information among various intelligent modules inside an automotive electronic system. Optimum functionality is achieved by transmitting this data in real time. The high bandwidth and high-

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Levin, Elizabeth Morris. "Effective litter reduction." Instructions for remote access. Click here to access this electronic resource. Access available to Kutztown University faculty, staff, and students only, 2006. http://www.kutztown.edu/library/services/remote_access.asp.

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Thesis (M.A. )--Kutztown University of Pennsylvania, 2006.<br>Source: Masters Abstracts International, Volume: 45-06, page: 2924. Typescript. Abstract precedes thesis as 2 leaves (iii-iv). Includes bibliographical references (leaves 99-102).

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5

Van, Horn R. Brooks III. "Procedural Reduction Maps." Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/14484.

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Procedural textures and image textures are commonplace in graphics today, finding uses in such places as animated movies and video games. Unlike image texture maps, procedural textures typically suffer from minification aliasing. I present a method that, given a procedural texture on a surface, automatically creates an anti-aliased version of the procedural texture. The new procedural texture maintains the original textures details, but reduces minification aliasing artifacts. This new algorithm creates an image pyramid similar to MIP-Maps to represent the texture. Whereas a MIP-Map stores per

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6

Chang, Jing. "Resistant dimension reduction /." Available to subscribers only, 2006. http://proquest.umi.com/pqdweb?did=1212784201&sid=10&Fmt=2&clientId=1509&RQT=309&VName=PQD.

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7

Power, Christopher. "Probabilistic symmetry reduction." Thesis, University of Glasgow, 2012. http://theses.gla.ac.uk/3493/.

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Model checking is a technique used for the formal verification of concurrent systems. A major hindrance to model checking is the so-called state space explosion problem where the number of states in a model grows exponentially as variables are added. This means even trivial systems can require millions of states to define and are often too large to feasibly verify. Fortunately, models often exhibit underlying replication which can be exploited to aid in verification. Exploiting this replication is known as symmetry reduction and has yielded considerable success in non probabilistic verificatio

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8

Ariu, Kaito. "Online Dimensionality Reduction." Licentiate thesis, KTH, Reglerteknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-290791.

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In this thesis, we investigate online dimensionality reduction methods, wherethe algorithms learn by sequentially acquiring data. We focus on two specificalgorithm design problems in (i) recommender systems and (ii) heterogeneousclustering from binary user feedback. (i) For recommender systems, we consider a system consisting of m users and n items. In each round, a user,selected uniformly at random, arrives to the system and requests a recommendation. The algorithm observes the user id and recommends an itemfrom the item set. A notable restriction here is that the same item cannotbe recommend

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9

Brooks, Billy. "Harm Reduction Panel." Digital Commons @ East Tennessee State University, 2018. https://dc.etsu.edu/etsu-works/3182.

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10

LEGRAMANTI, SIRIO. "Bayesian dimensionality reduction." Doctoral thesis, Università Bocconi, 2021. http://hdl.handle.net/11565/4035711.

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No abstract available<br>We are currently witnessing an explosion in the amount of available data. Such growth involves not only the number of data points but also their dimensionality. This poses new challenges to statistical modeling and computations, thus making dimensionality reduction more central than ever. In the present thesis, we provide methodological, computational and theoretical advancements in Bayesian dimensionality reduction via novel structured priors. Namely, we develop a new increasing shrinkage prior and illustrate how it can be employed to discard redundant dimensions in G

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11

Fruth, Florian. "Reduction of Aerodynamic Forcing inTransonic Turbomachinery : Numerical Studies on Forcing Reduction Techniques." Doctoral thesis, KTH, Kraft- och värmeteknologi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-127967.

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Due to more and more aggressive designs in turbomachinery, assuring the structural integrity of its components has become challenging. Also influenced by this trend is blade design, where lighter and slimmer blades, in combination with higher loading, lead to an increased risk of failure, e.g. in the form of blade vibration. Methods have been proposed to reduce vibration amplitudes for subsonic engines, but cannot directly be applied to transonic regimes due to the additional physical phenomena involved. Therefore the present work investigates numerically the influence of two methods for reduc

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12

Siriwatcharapiboon, Wilai. "The electrochemistry of metal nanoparticles for oxygen reduction and nitrate/nitrite reduction." Thesis, University of Birmingham, 2013. http://etheses.bham.ac.uk//id/eprint/4475/.

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This research has scientific aims focused on two important electrochemical reactions: oxygen reduction and nitrate/nitrite reduction. A series of rhodium (Rh) deposited on gold nanorods (Au NRs) and gold nanoparticles (Au NPs) were synthesised by wet chemical reduction. The scanning transmission electron microscopy (STEM) showed that Rh has a preferential deposition and epitaxial growth at the end of Au NRs. Cyclic voltammetry and rotating disc electrode (RDE) measurements were performed to study the oxygen reduction at these Au:Rh/C catalysts. Pyrolysed cobalt triethylenetetraamine on a carbo

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13

Wessels, Charlotte Elize. "Reduction of selenium by Pseudomonas Stutzeri NT-l; Growth reduction and kinetics." Diss., University of Pretoria, 2017. http://hdl.handle.net/2263/62802.

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Bioremediation of seleniferous water is gaining more momentum, especially when it comes to bacterial reduction of the selenium oxyanions. More and more bacterial strains that are able to reduce selenium are being isolated. These bacteria need to be studied further to determine whether they are suited for industrial application. In this study, the reduction of Se(VI) to Se(0) by Pseudomonas stutzeri NT-I was examined using batch experiments with the bacteria suspended in MSM. For the determination of the optimum conditions for the growth of the bacteria, the linearized rate during the exponenti

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14

Lopez, Susana Sorina. "Chiral Boro-Phosphates in Asymmetric Catalysis: 1,4-reduction of Enones and Reductive Aldol." Scholar Commons, 2016. http://scholarcommons.usf.edu/etd/6305.

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The biological activity of the pharmaceutical drugs often depends on how it fits with a receptor making stereochemistry a key component. Selective reactions can limit or avoid the mixture of enantiomers obtained. One such reaction is the selective reduction of a carbon-carbon double bond in the presence of a carbonyl. Although efficient, current asymmetric synthesis methods have limitations such as harsh reaction conditions, the high costs of chiral catalysts and the toxicity of the metal-based catalysts. Catalysts derived from small organic molecules have become an attractive alternative whic

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15

Chan, Ming-Yan. "Video encoder complexity reduction /." View abstract or full-text, 2005. http://library.ust.hk/cgi/db/thesis.pl?ELEC%202005%20CHANM.

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16

Linch, William Divine. "On superspace dimensional reduction." College Park, Md. : University of Maryland, 2005. http://hdl.handle.net/1903/2844.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2005.<br>Thesis research directed by: Physics. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

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17

Akbay, Gokhan. "Function, Reduction And Normativity." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/3/12611917/index.pdf.

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Normativity of biological functions create a serious obstacle against the reduction of functional biology into molecular biology. Normativity of biological entities has two interconnected sources. One is the internal complexity and self organization demonstrated by the organism. The second source is external to the organism: Natural selection. An organism adapts to its environment by its internal autonomy. Species or populations adapt by natural selection. If these two sources of normativity can be reduced to statistical generalities achieved by theoretical models, reductionism will prevail.

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18

Fransson, Henrik. "Active Noice Reduction headset." Thesis, KTH, Reglerteknik, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-105714.

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Conventional (passive) headsets used in propeller aircrafts are reasonably good at attenuating mid to high frequency noise, but fail to achieve good attenuation in the low frequency region (below approximately 300 Hz). Active Noise Reduction (ANR) improves the low frequency attenuation by introducing an anti-noise signal creating destructive interference thus decreasing the residual noise level. The aim of this thesis is to develop and implement a digital narrowband active noise reduction headset that works properly in aircrafts and not only in a laboratory environment. The implementation is b

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19

Vihman, Virve-Anneli. "Valency reduction in Estonian." Thesis, University of Edinburgh, 2004. http://hdl.handle.net/1842/25272.

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Theories of voice based on a model of passivisation such as that exhibited by English tend to characterise valency modifications as primarily a syntactic phenomenon, involving the mapping of semantic roles to non-canonical syntactic argument positions. This dissertation finds such an approach insufficient to account for the observed phenomena in the more complex domain of voice in Estonian. The thesis provides a thorough description of the Estonian voice category, through an in-depth study of four valency-reducing constructions: the impersonal, personal passive, generic apersonal, and anticaus

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20

Purssell, Tanis Jane. "Modulus reduction dynamic analysis." Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/25136.

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A semi-analytical method of dynamic analysis, capable of predicting both the magnitude and pattern of earthquake induced deformations, is presented. The analysis is based on a modulus reduction approach which uses a reduced modulus to simulate the softening induced in soils during cyclic loading. The effects of the inertia forces developed during dynamic loading on the induced deformations are also included through an appropriate selection of the reduced modulus. The reduced modulus is utilized in a static stress-strain analysis to predict the magnitude and pattern of the deformations induced

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21

Falkman, Patrik. "Efficient reduction over threads." Thesis, KTH, Teoretisk fysik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-49818.

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The increasing number of cores in both desktops and servers leads to a demand for efficient parallel algorithms. This project focuses on the fundamental collective operation reduce, which merges several arrays into one by applying a binary operation element wise. Several reduce algorithms are evaluated in terms of performance and scalability and a novel algorithm is introduced that takes advantage of shared memory and exploits load imbalance. To do so, the concept of dynamic pair generation is introduced which implies constructing a binary reduce tree dynamically based on the order of thread a

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22

Sutton, Patrick James. "The dimensional-reduction anomaly." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ59681.pdf.

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23

Gara, Matthew. "Oxygen reduction on platinum." Thesis, University of Oxford, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.665289.

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Proton exchange membrane (PEM) fuel cells have the potential to provide a clean and convenient source of power for applications such as vehicle transport. At their heart lies a platinum catalyst which is used to reduce oxygen to water. Although platinum is expensive it is the best elemental catalyst for the reaction. In order to make better use of the platinum and reduce production costs, nanoparticulate platinum is dispersed onto a carbon support. This results in a greater surface area per gram of platinum used. Efforts to improve the performance of fuel cells and make them cost effective hav

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24

Kang, Keebom. "AVCAL reduction analysis model." Thesis, Monterey, California. Naval Postgraduate School, 1991. http://hdl.handle.net/10945/26391.

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25

Hayes, Matthew J. "Artefact reduction in photoplethysmography." Thesis, Loughborough University, 1998. https://dspace.lboro.ac.uk/2134/7094.

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The use of optical techniques in biomedical monitoring and diagnosis is becoming increasingly widespread, primarily because of the non-invasive nature of optically derived measurements. Physiological analysis is usually achieved by characterisation of the spectral or temporal properties of the interaction between light and the anatomy. Although some optical measurements require complex instrumentation and protocols, recent technological advances have resulted in robust and compact equipment that is now used routinely in a multitude of clinical contexts. Unfortunately, these measurements are in

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26

Whiting, Daniel. "Meaning, use and reduction." Thesis, University of Reading, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.428294.

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Jurkauskas, Valdas 1966. "Copper-catalyzed conjugate reduction." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/17742.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 2004.<br>Includes bibliographical references.<br>Chapter 1. A highly enantioselective catalyst for the asymmetric conjugate reduction of a,- unsaturated cyclic ketones was generated upon combination of catalytic amounts of CuCl, NaOt-Bu, and a chiral bis-phosphine with poly(methylhydrosiloxane) (PMHS) as the stoichiometric reductant. In this process, chiral 3-alkylcyclopentanones were isolated in high enantiomeric excess (ee =/> 92%) and in moderate to excellent yields (42-91%). Chapter 2. Kinetic resolution, with good

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Li, Qian. "Electrochemical reduction of oxygen." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:2f37a1ae-dab0-4581-a8fd-e01ce59246c4.

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The main aim of the work reported is the design of proof-of-concept of at point-of-use hydrogen peroxide electrogeneration from air. The experimental work discussed within this thesis explores five major areas: the kinetics of electrocatalysis, ion-pairing, change of solvent media, the electrode surface modication by a redox mediator, and the electrochemical reduction of oxygen within enhanced mass transport systems. The electrocatalytic rates and mass transport of two oxygen reduction redox meditors, viz. anthraquinone and methyl viologen, are studied in aqueous solutions. The investigation i

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Lubchak, I. V., and A. Koneva. "Inhibitors for cholesterol reduction." Thesis, Sumy State University, 2016. http://essuir.sumdu.edu.ua/handle/123456789/45956.

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Cardiovascular diseases (CVDs) are a group of disorders of the heart and blood vessels. Many of them involve atherosclerosis, which causes most heart attacks and strokes. Cardiovascular diseases are the leading cause of death globally. Nearly 2,200 Americans die of cardiovascular disease daily, with an average of one death occurring every 40 seconds. However, elevated levels of certain forms of cholesterol are some of the primary drivers in the development of some CVDs.

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Munster, Drayton William. "Sensitivity Enhanced Model Reduction." Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/23169.

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In this study, we numerically explore methods of coupling sensitivity analysis to the reduced model in order to increase the accuracy of a proper orthogonal decomposition (POD) basis across a wider range of parameters. Various techniques based on polynomial interpolation and basis alteration are compared. These techniques are performed on a 1-dimensional reaction-diffusion equation and 2-dimensional incompressible Navier-Stokes equations solved using the finite element method (FEM) as the full scale model. The expanded model formed by expanding the POD basis with the orthonormalized basis sens

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31

Lu, Huajun. "Reduction of elliptic curves." Thesis, Bordeaux 1, 2010. http://www.theses.fr/2010BOR14129.

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Soit E une courbe elliptique sur un corps de valuation discrètecomplet K à corps résiduel algbriquement clos. Alors E a réduction semi-stable surune extension minimale L/K, galoisienne de groupe de Galois G. Soient O_{K} , O_{L} les anneaux de valuations respectives de K et L, et X , X' les modèles réguliers minimaux de E sur O_{K} et O_{L} respectivement.Premièrement nous montrons que pour tout entier naturel n, la fibre fermée infinitésimale X_{n} est déterminée par l'action du groupe G sur X'_{n+l} pour unentier naturel l assez grand (ne dépendant que du discriminant de L/K sile type de réd

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32

Yang, Jing. "Visual hierarchical dimension reduction." Link to electronic thesis, 2002. http://www.wpi.edu/Pubs/ETD/Available/etd-0109102-132821.

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Thesis (M.S.)--Worcester Polytechnic Institute.<br>Keywords: hierarchy; sunburst; dimension reduction; high dimensional data set; multidimensional visualization; parallel coordinates; scatterplot matrices; star glyphs. Includes bibliographical references (p. 86-91).

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Ponton, Rhys. "Evidence based harm reduction." Thesis, University of Bath, 2006. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.438656.

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Review of the literature demonstrated that knowledge surrounding the process of illicit drug injection preparation is limited. A better understanding of the details of injection preparation methods could inform study of the risks and complications, as well as the development of harm reduction advice. This project had two main objectives: To characterise the injection preparation process in detail, then to attempt to quantify the risks posed by these injections through laboratory investigations. The project had specific focus on the use of the acids by injectors to increase the solubility of in

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Hartley, Benjamin C. "Recent advances in tandem reductive processes." Thesis, University of Bath, 2009. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.500753.

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The research presented herein is concerned with the exploration of tandem processes initiated by the conjugate reduction of Michael acceptors, encompassing the asymmetric reductive Dieckmann reaction and the two-carbon homologation of aldehydes by two complementary methodologies. Chapter 1 introduces the area of transition metal catalysed tandem reductive processes as a tool for carbon-carbon bond formation. An extensive discussion of this methodology is included and recent advances in the area are highlighted. Chapter 2 discusses the initial study into the asymmetric reductive Dieckmann conde

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Coby, Aaron J. "Microbial iron-(hydr)oxide reduction effects on zinc speciation and interactions with nitrate reduction /." [Bloomington, Ind.] : Indiana University, 2005. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:3163021.

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Thesis (Ph.D.)--Indiana University, School of Public Environmental Affairs, 2005.<br>Source: Dissertation Abstracts International, Volume: 66-02, Section: B, page: 0765. Adviser: Flynn W. Picardal. Title from dissertation home page (viewed Oct. 18, 2006).

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Granier, Pierre. "Reduction, aménagement-reduction du temps de travail et emploi : contribution à une analyse théorique." Aix-Marseille 2, 1992. http://www.theses.fr/1992AIX24005.

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Slagbrand, Tove. "Development and Applications of Molybdenum-Catalyzed Chemoselective Amide Reduction." Doctoral thesis, Stockholms universitet, Institutionen för organisk kemi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-145560.

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This thesis covers the development of catalytic methodologies for the mild and chemoselective hydrosilylation of amides. The first part describes the investigation of the Mo(CO)6-catalyzed reduction of carboxamides. It was found that the reduction could be controlled by tuning the reaction temperature and either amines or aldehydes could be obtained selectively. The system showed an unprecedented chemoselectivity and the amide reduction could take place in the presence of other reducible functional groups such as ketones, aldehydes, and imines. Moreover, the transformation could be performed o

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Bolelli, Maria Virginia. "Diffusion Maps for Dimensionality Reduction." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/18246/.

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In this thesis we present the diffusion maps, a framework based on diffusion processes for finding meaningful geometric descriptions of data sets. A diffusion process can be described via an iterative application of the heat kernel which has two main characteristics: it satisfies a Markov semigroup property and its level sets encode all geometric features of the space. This process, well known in regular manifolds, has been extended to general data set by Coifman and Lafon. They define a diffusion kernel starting from the geometric properties of the data and their density properties. This kern

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Short, Daniel R. "AH-64 Apache cost reduction." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2000. http://handle.dtic.mil/100.2/ADA377413.

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Nuszkowski, John. "Staten Island ferry emissions reduction." Morgantown, W. Va. : [West Virginia University Libraries], 2005. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4169.

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Thesis (M.S.)--West Virginia University, 2005.<br>Title from document title page. Document formatted into pages; contains xi, 94 p. : ill. (some col.), col. map. Includes abstract. Includes bibliographical references (p. 74-79).

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Niesdroy, Henning [Verfasser]. "Geometric reduction theory / Henning Niesdroy." Bielefeld : Universitätsbibliothek Bielefeld, 2016. http://d-nb.info/1096457164/34.

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Igiehon, Uwagboe Osamede. "Carbothermic reduction of complex sulphides." Thesis, Imperial College London, 1990. http://hdl.handle.net/10044/1/46358.

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Krasik, Pavel. "Asymmetric ruthenium catalyzed reduction reactions." Thesis, University of Ottawa (Canada), 1994. http://hdl.handle.net/10393/6562.

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Flaaten, Marcus. "Efficient polygon reduction in Maya." Thesis, Linköpings universitet, Medie- och Informationsteknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-121687.

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Reducing the number of vertices in a mesh is a problem that if solved correctly can save the user a lot of time in the entire process of handling the model. Most of the solutions today are focused on reducing the mesh in one big step by running a separate application. The goal of this implementation is to bring the reduction application into the users workspace as a plugin. Many of the modellers in the various computer graphics industries use Autodesk Maya the plugins intention is to create a efficient tool which also give the modellers as much freedom as possible without the need to ever leav

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Khosla, Nitin, and n/a. "Dimensionality Reduction Using Factor Analysis." Griffith University. School of Engineering, 2006. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20061010.151217.

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In many pattern recognition applications, a large number of features are extracted in order to ensure an accurate classification of unknown classes. One way to solve the problems of high dimensions is to first reduce the dimensionality of the data to a manageable size, keeping as much of the original information as possible and then feed the reduced-dimensional data into a pattern recognition system. In this situation, dimensionality reduction process becomes the pre-processing stage of the pattern recognition system. In addition to this, probablility density estimation, with fewer variables i

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Wijnen, Joseph Anna Guillaume. "Exercise and cardiovascular risk reduction." Maastricht : Maastricht : Universitaire Pers Maastricht ; University Library, Maastricht University [Host], 1994. http://arno.unimaas.nl/show.cgi?fid=6547.

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Panudulkitti, Panupong. "Urbanization and Poverty Reduction Outcomes." Digital Archive @ GSU, 2008. http://digitalarchive.gsu.edu/econ_diss/45.

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This dissertation attempts to examine the effect of urbanization on poverty reduction outcomes by considering various dimensions of poverty and channels of reducing poverty. First, we develop a theoretical model in order to infer a relationship between urbanization and poverty reduction outcomes. Specifically, it shows an optimal level of urbanization to properly allocate basic public infrastructure and promote pro-poor growth. Second, we conduct empirical analysis on international data to examine the testable hypotheses that are derived from the theoretical model. Further, we explore the “ch

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48

Slobodov, Sergei. "Dimensional reduction and spacetime pathologies." Thesis, University of British Columbia, 2010. http://hdl.handle.net/2429/30364.

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Dimensional reduction is a well known technique in general relativity. It has been used to resolve certain singularities, to generate new solutions, and to reduce the computational complexity of numerical evolution. These advantages, however, often prove costly, as the reduced spacetime may have various pathologies, such as singularities, poor asymptotics, negative energy, and even superluminal matter ﬂows. The ﬁrst two parts of this thesis investigate when and how these pathologies arise. After considering several simple examples, we ﬁrst prove, using perturbative techniques, that under certa

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49

Langlais, Joseph. "Strontium extraction by aluminothermic reduction." Thesis, McGill University, 1991. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=22447.

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The Melt-Leach-Evaporation (MLE) process is under development for the extraction of valuable Group IA or IIA metals of the Periodic Table, such as lithium, calcium, magnesium and strontium. The process consists of mixing and contacting the value metal source material, which might be an ore or concentrate, with an excess of molten metal which is acting as a reductant and lixiviant. In the process, the value metal extracted from the source material is dissolved in the excess molten metallic solvent and is subsequently extracted as a vapour by vacuum distillation. The vapour is condensed and recu

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50

David, Chantal. "Supersingular reduction of Drinfeld modules." Thesis, McGill University, 1993. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=41268.

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Let $ phi$ be a rank 2 Drinfeld A-module over the ring A of polynomials over some finite field $F sb{q}$. We give a bound on the norm of those primes p of A which are factors of $P sb{d}(j sb phi)$ for two distinct polynomials d $ in$ A. We then show that the number of supersingular primes of $ phi$ with norm smaller than x is $ gg log log$ x. We investigate the endomorphism rings of supersingular Drinfeld A-modules over finite fields. Under a mild hypothesis, this leads to an upper bound of $x sp{3/4} log sp2 x$ for the number of supersingular primes of $ phi$, with even degree, and norm smal

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