277 research outputs found
Fast Transformations with Walsh-Hadamard Functions
No full textTitle: Fast Transformations with Walsh-Hadamard Functions, Author: Frank Y.Y. Shum, Location: ThodeIn this thesis, various techniques to generate Walsh-Hadamard functions are discussed. Efficient algorithms to compute the discrete Walsh-Hadamard transform have been derived and implemented. The design of a simple, but very fast, digital circuit that can perform the transform or its inverse is presented. These algorithms have been applied to the processing of speech for the investigation of bit rate reduction. Intelligible speech has been reconstructed from 8 or 4 dominant Walsh-Hadamard coefficients out of a field of 64, with a constant update time of 8 milliseconds, on a CDC-1700 computer.ThesisMaster of Engineering (ME
On fully nonlinear CR invariant equations on the Heisenberg group
No full textAbstractIn this paper we provide a characterization of second order fully nonlinear CR invariant equations on the Heisenberg group, which is the analogue in the CR setting of the result proved in the Euclidean setting by A. Li and the first author in Li and Li (2003) [21]. We also prove a comparison principle for solutions of second order fully nonlinear CR invariant equations defined on bounded domains of the Heisenberg group and a comparison principle for solutions of a family of second order fully nonlinear equations on a punctured ball
Chiral tetranuclear and dinuclear copper(II) complexes for TEMPO-mediated aerobic oxidation of alcohols : are four metal centres better than two?
No full textThe one-pot reaction of 3,5-di-tert-butyl-2-hydroxybenzaldehyde, (R)-2-aminoglycinol and Cu(OAc)2·2H2O in a 1 : 1 : 1 ratio in the presence of triethylamine led to the isolation of X-ray quality crystals of the chiral complex (R)-1 in high yield. The single crystal structure of (R)-1 reveals a tetranuclear copper(II) complex that contains a {Cu4(μ-O)2(μ3-O)2N4O4} core. A reaction using (1S,2R)-2-amino-1,2-diphenylethanol as precursor under the same conditions generated the chiral complex (S,R)-2; its structure was determined by single crystal X-ray crystallography and was found to contain a {Cu2(μ-O)2N2O2} core. Both (R)-1 and (S,R)-2 have been used for catalytic aerobic oxidation of benzylic alcohols in combination with the TEMPO (2,2,6,6-tetramethylpiperidinyl-1-oxyl) radical. (R)-1 selectively catalyses the conversion of various aromatic primary alcohols to the corresponding aldehydes with high yields (99%) and TONs (770) in the air, while (S,R)-2 exhibits less promising catalytic performance under the same reaction conditions. The role of the cluster structures in (R)-1 and (S,R)-2 in controlling the reactivity towards aerobic oxidation reactions is discussed
Politically-mediated affects: envy in Spinoza's Tractatus Politicus
No full textIn the Tractatus Politicus Spinoza argues that politically unequal societies can be extremely stable. This feature of his work is at odds with a view, common in the literature, that Spinoza is a democratically-minded author who defends inclusive political systems, and in this paper I consider how he thinks inequality can be sustained. I focus on his discussion of the ways in which envy can be offset or redirected; and I apply my conclusions to his notorious claim that women are not fit to rule
Natural Gas Production and CO2 Sequestration in a Class 2 Hydrate Accumulation: A Numerical Simulation Study
No full textLarge amounts of natural gas hydrates have been found in sub-oceanic deposits and beneath permafrost regions. It has the potential to become a major hydrocarbon resource in the near future. Research is needed to evaluate the production possibilities of this new resource. CH4 hydrate dissociation and production is an endothermic process and a production challenge is the reservoir temperature reduction. CO2 is thermodynamically favoured over CH4 in the hydrate form and it has been suggested to use CO2 to prevent cooling by replacement of CH4 hydrates with CO2 hydrates. This technique has three advantages: sequestration of CO2, increased CH4 production and maintaining formation stability. The effect of CO2 injection on the CH4 production from a hydrate reservoir has been investigated by numerical simulations. A sensitivity analysis on the CH4 production has been performed by varying the injection pressure, temperature, reservoir properties, hydrate blockage models, intrinsic kinetic rates for CO2 hydrate formation and numerical parameters. The research has been performed by running numerical simulations using the kinetic simulator STARS from CMG. A 3D homogeneous class 2 hydrate reservoir was constructed with a production well completed in the hydrate zone and an injection well completed in the free water zone, injecting liquid CO2 in the free water zone below the CH4 hydrate zone. The injection and production well pressure were regulated to create CO2 hydrate forming and CH4 hydrate dissociation conditions in the reservoir. The simulation results have shown that when CO2 is injected, the cumulative CH4 production can increase with 50-60 %, while storing significant amounts of CO2 simultaneously. 2 % of the injected CO2 was produced at the production well. CO2 hydrates were formed directly under the CH4 hydrates, supplying the dissociating CH4 hydrates with a low grade heat source. No upward moving front of CO2 was observed. It is concluded that CO2 injection only increases CH4 production when the temperature of the reservoir is too low to support further hydrate dissociation. The highest recovery rates are achieved with low injection pressures. Injection of CO2 in the gas phase is favoured and the intrinsic kinetic formation rate for CO2 hydrates is a major influence on the CH4 production. It is concluded that CO2 injection in a Class 2 hydrate reservoir could increase the CH4 production under certain conditions.Petroleum EngineeringGeotechnologyCivil Engineering and Geoscience
Living with Disability: A Historical Perspective on Socialist-era Housing in Romania 1959-1989
No full textNicolae Ceausescu's regime in Romania, beginning in 1965, aimed at industrializing the country by increasing the labor force, leading to the development of large-scale housing blocks across Romania following the Soviet model. Urban planning and design were instrumental in serving political objectives such as industrial development, urban homogenization, and social control. However, amidst these grand architectural visions, the experiences of individuals with disabilities have been largely overlooked. The government's policies toward individuals with disabilities reflected a belief that they were incapable of contributing to a socialist society, resulting in their marginalization and neglect. This thesis explores the experiences of individuals with motor disabilities in Romania during the 20th century, shedding light on their marginalized narratives within the context of socialist-era architectural decisions. Through historical analysis, case studies of housing developments and interviews with residents, the research will be led by the question “How did the political policies and architectural design strategies employed during the construction of socialist era building blocks in Romania shape the living conditions, accessibility, and well-being of the disabled community?" The paper argues that architecture acted as a barrier to the integration of the disabled community, directly leading to increased institutionalization rates among individuals with physical and motor disabilities, as it substantially hindered their ability to lead typical lives within their homes. The thesis contributes to contemporary discussions on inclusive urban planning and societal perceptions, highlighting the importance of considering diverse perspectives and understanding the history of the context in architectural design and policymaking.AR2A011Architectural History ThesisArchitecture, Urbanism and Building Science
News Representation in Newspaper ,,Segodnya" for 1919 and 1925
No full textDarbs veltīts 1919. un 1925. gadu avīzē „Segodnja” zinu materiāla reprezentācijai. Autors salīdzina avīzes „Segodnja” izdevēju izmantoto stratēgiju reprezentējot notikumus sagatavojot kārtējo noteikta laika perioda numurus. Pirmajā izpētes dalā autors nosaka izmantotas jēdzienus, tādus kā „zinu materiāls”, „notikums”, „normas”. Otra dala veltīta noteiktā perioda zinu materiāla analīzei.The paper is devoted to the research of the representation of news in newspaper “Segodnya” n 1919 and 1925 y.y. The author makes a comparison of strategies which editors of “Segodnya” used to consider while newspaper was issued. The first chapter of paper examines concepts which author involves in his research, such as “news”, “event”, “normalcy”. The second part of research is devoted to analysis of news in 1919 and 1925 y.y.
The research can be interesting to philologists, dealing with evolution of Russian press in Latvia during the first half of XX century, as well as to all inquisitive readers
Hoogbouw, gebouwvorm en windbelasting
No full textMet als bijlage: A0 poster. In dit afstuderen wordt een onderzoek gedaan naar de invloeden van openingen dwars door een gebouw op de windbelasting. De informatie die uit de resultaten voortkomen dienen als hulpmiddel voor de bouwkundige ontwerpers. Wanneer bouwkundige ontwerpers informatie beschikken over de invloeden van gebouwvormen op de wind, kan hier in een vroeg stadium rekening mee gehouden worden. Dit zal resulteren in tijd en geldbesparing. Allereerst is er een vergelijking gedaan tussen verschillende methoden voor het bepalen van de windbelasting. Vervolgens is er gekeken naar de gevolgen van de verschillende windbelastingen op de hoofddraagconstructie.Architectur
DATACENTRIC COMMON: New urban data center
No full textAlong with the growing amount of data usage and smart city development, more data centers are expected to be built in the urban area to meet the demand of even higher connectivity and lower latency brought up by the advance technology. Data centers have long been an infrastructural typology that prioritizes machinery functionality over humanity. Urbanization of data centers means more urban space will be taken up by inaccessible data centers that are designed purely for servers, which harms our livability. As data usage is growing exponentially every year, it is imperative for the city to design a way that situate data centers more harmoniously into the city fabric that bring positive impact to the social context and the neighboring environment. The design focuses on developing a new data center typology which could at the same time fulfill the growing demand of data infrastructure in Manhattan central business center and provide positive impact to social life and the environment. Looking into situation in Northeast Midtown Manhattan, an adaptive reuse proposal is adopted to redesign an existing 50-years old office tower, which is 40 stories high and fully vacant at the moment, into a new data center that fit contemporary need. The project incorporates function of a data center, office and public amenities. The design aims to position data centers in midtown Manhattan as anchors of smart city developments and harnesses its waste energy to empower social gathering places and creative work environment.DatacentriccommonManhattanArchitecture, Urbanism and Building Sciences | Complex Project
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