402 research outputs found
IMPROVING THE SECURITY OF A DATA COMMUNICATION SYSTEM USING ENCRYPTED TECHNOLOGY
No full textAbstract: This work presents improving security of data communication system using advanced management of encryption software scheme. The work characterized a case study network designed with data encryption technique and then improved the network using an advanced data encryption technique. The encryption technique was developed using optimized blow fish algorithm which has the ability to segment keys and input packet matrix before simultaneous encryption. This process improves security, processing speed and time. The technique was implemented on Mathlab Simulink platform and tested. The result showed that the data encryption time of the new algorithm was 79.8ms against 113.05ms of the characterized system. The decryption key was improved from 8bit to 32bit in the new algorithm making the decryption process more complex for hackers, but improved data security in the system.
Keywords: Encryption, Data communication, Fish algorithm, Decryption, Packet matrix.
Title: IMPROVING THE SECURITY OF A DATA COMMUNICATION SYSTEM USING ENCRYPTED TECHNOLOGY
Author: Eze Cletus Elijah, Alor M.O
International Journal of Electrical and Electronics Research
ISSN 2348-6988 (online)
Vol. 10, Issue 4, October 2022 - December 2022
Page No: 1-16
Research Publish Journals
Website: www.researchpublish.com
Published Date: 03-November-2022
DOI: https://doi.org/10.5281/zenodo.7277023
Paper Download Link (Source)
https://www.researchpublish.com/papers/improving-the-security-of-a-data-communication-system-using-encrypted-technologyInternational Journal of Electrical and Electronics Research, ISSN 2348-6988 (online), Research Publish Journals,
Website: www.researchpublish.co
MODELLING AND SIMULATION OF SHUNT CAPACITOR EXCITED RELUCTANCE GENERATOR AS A STAND-ALONE GENERATOR
No full textAbstract: This paper presents a methodology for accurately predicting the minimum value of capacitance necessary to initiate excitation in a standalone self-excited reluctance generator (SERG). The methodology is based on modeling, analysis and simulation of various capacitances to determine the range of capacitance needed for excitation. The dynamic and steady-state performances of the self-excited reluctance generator were analyzed under different operating conditions. This analysis was done by developing a complete dynamic model of SERG including the excitation capacitors and load. The performances of the machine under conditions of constant load, and varying loads were analyzed and presented. The modeling and simulation have been carried out using MATLAB‐Simulink platform. The results obtained shows that for excitation to take place, the minimum value of capacitor needed is 61µf, below which the generator will not excite. The machine could excite and attained its rated voltage between 61µf to 110µf, above which the generator begins to generate over voltage. For the dynamic performance analysis, the results shows that with the variations in the connected loads, the output frequency of SERG remains constant, which makes it a good alternative for remote area applications.
Keywords: Reluctance generator, Modelling, Excitation Capacitance, Computer, Matlab Simulink.
Title: MODELLING AND SIMULATION OF SHUNT CAPACITOR EXCITED RELUCTANCE GENERATOR AS A STAND-ALONE GENERATOR
Author: Amu Victor Ndubuisi, M.O Alor
International Journal of Electrical and Electronics Research
ISSN 2348-6988 (online)
Vol. 10, Issue 2, April 2022 - June 2022
Page No: 27-34
Research Publish Journals
Website: www.researchpublish.com
Published Date: 01-June-2022
DOI: https://doi.org/10.5281/zenodo.6602524
Paper Download Link (Source)
https://www.researchpublish.com/papers/modelling-and-simulation-of-shunt-capacitor-excited-reluctance-generator-as-a-stand-alone-generatorInternational Journal of Electrical and Electronics Research, ISSN 2348-6988 (online), Research Publish Journals (Publisher), Website: www.researchpublish.co
Address by President M.O. Morgan opening of Engineering/Geology Building, October 20, 1977
No full textAddress by President M.O. Morgan,Opening of Engineering-Geology Building, October 20, 1977Title from captio
Die Hörspiele von Wolfgang Ambros, Josef Prokopetz und M.O. Tauchen
No full textDer österreichische Sänger und Songschreiber Wolfgang Ambros hat zwischen 1973 und 1981 vier Hörspiele veröffentlicht. Verfasst hat er sie gemeinsam mit Josef Prokopetz und M.O. Tauchen. Die vorliegende Dissertation setzt diese Werke, popularkulturelle Sozialsatiren, in Bezug zum Wiener Volkstheater. Der Autor wollte beweisen, dass die Ambros-Hörspiele Fäustling, Der Watzmann ruft, Schaffnerlos und Augustin in der Tradition des Wiener Volkstheaters stehen. Das bedeutet aber nicht, dass von den Ursprüngen der Wiener Volkskomödie eine durchgängige Traditionslinie von Joseph Anton Stranitzky über Johann Nestroy bis zu Wolfgang Ambros und der Musikbewegung Austropop verfolgt wurde, sondern, dass Versatzstücke des Wiener Volkstheaters in den untersuchten Hörspielen ausfindig gemacht, analysiert und interpretiert wurden. In diesem Kontext wurde auch ein großes Augenmerk darauf gelegt die literarische Qualität der Hörspiele von Ambros, Prokopetz und Tauchen herauszuarbeiten um ihnen auf diesem Weg den ihnen gebührenden Rang in der österreichischen Hörspiel- und Literaturgeschichte zu geben. Darüberhinaus wurde auch auf die zum Teil hohe Qualität zahlreicher anderer Songtexte von Wolfgang Ambros, Josef Prokopetz und vor allem jenen von Georg Danzer hingewiesen. Austropop ist nicht nur ein Teil österreichischer Musik-, sondern auch Literaturgeschichte. Dieses Faktum in der Forschung zu etablieren ist eines der Hauptanliegen der vorliegenden Doktorarbeit. Die vier untersuchten Hörspiele sind in ihrem sozialsatirischen Impetus und durch ihre mannigfaltige künstlerische Gestaltung als Prototypen der traditionsbrechenden Haltung des Austropop anzusehen und das, weil beziehungsweise obwohl sie aus der Tradition mit der Tradition, in diesem Falle, der des Wiener Volkstheaters, arbeiten. Dieses Oszillieren zwischen Traditionsbruch und Weiterleben der Tradition möchte der Verfasser mit seiner Dissertation versuchen aufzuzeigen.The Austrian singer and songwriter Wolfgang Ambros published between 1973 and 1981 four radio plays. He wrote them together with Josef Prokopetz and M.O. Tauchen. This dissertation examines the reference of these works to the Viennese Volkstheater. The Ambros-radio-plays, the author calls them “popular-cultural social satires”, Fäustling, Der Watzmann ruft, Schaffnerlos and Augustin keep the tradition of the Viennese Volkstheater. That doesn’t mean, that there is a continous and incessant tradition from Joseph Anton Stranitzky to Johann Nestroy and from Johann Nestroy to Wolfgang Ambros and the musical movement called “Austropop” - it means, that rudiments and elements of the Viennese Volkstheater live on in the radio plays of Ambros, Tauchen and Prokopetz. In this context the author also investigated and analysed the partially high literary quality of Ambros’ radio plays, his and the songs of Georg Danzer. The lyrics of Ambros, Prokopetz and primarily Danzer and also the examined radio plays are part of the Austrian history of literature and history of radio plays. This doctoral thesis wants to treat these radio plays and songs with the kind of due respect the Austrian history of literature and radio plays has been ignoring until today. Fäustling, Der Watzmann ruft, Schaffnerlos and Augustin are classic examples for Austropop, a movement which breakes with (musical) traditions and social taboos even though the protagonists of Austropop work with traditional elements, in this case with elements of the Viennese Volkstheater. The radio plays of Ambros, Prokopetz and Tauchen oscillate between destruction, disruption, mutation, metamorphosis and preservation of tradition. To work out this fact is the purpose of the dissertation Die Hörspiele von Wolfgang Ambros, Josef Prokopetz und M.O. Tauchen. Popularkulturelle Sozialsatiren in der Tradition des Wiener Volkstheaters
Distributed secondary gas injection via a fractal injector: A nature-inspired approach to improving conversion in fluidized bed reactors
No full textThe conversion in bubbling fluidized bed reactors is suppressed because the interphase mass transfer and gas-solid contact in bubbling fluidized bed reactors are often poor. Most of the gas is present in the form of bubbles, which have low surface-to-volume ratios and are nearly devoid of catalyst particles. The chaotic behaviour of the bubbles is difficult to predict and can change with reactor size, making scale-up very difficult. The work in this thesis presents a novel approach to overcoming these difficulties in bubbling fluidized beds. Nature uses branching, fractal structures, which greatly facilitate mass transfer in natural systems, such as trees and lungs. These structures scale easily, which is a very important feature as the organism grows. This approach can also be applied to fluidized beds. A fractal injector was developed for both quasi 2-D and 3-D beds to distribute a portion of the total gas flow throughout the fluidized bed. To determine the effect of this distributed secondary gas injection on the properties of a gas-solid fluidized bed, the study is split into four topics: the effect on the hydrodynamics of the fluidized bed, the mechanisms leading to the observed changes in the hydrodynamics, the residence time and macroscopic mixing of the gas, and the influence on the performance of the reactor. The results indicate that secondary gas injection via a fractal injector effectively reduces the bubble diameter by up to 30% (~70% reduction in the volume) and increases the gas-solid contact. It is shown that these effects lead to a higher conversion and selectivity in a bubbling fluidized bed reactor. Mechanisms for these effects are proposed.Applied Science
Fundamentals of tri-block copolymer self-assembly in solutions, and its relation to nano-templating
No full textThe purpose of this thesis is to obtain a better understanding of the formation mechanism of mesoporous silica materials, such as SBA-15 that use block copolymers as templating agents. Despite the fact that these materials are now extensively synthesized, the fundamental role of the different synthesis variables has not been determined on the basis of a detailed physical chemical study. Such a synthesis typically starts with the formation of spherical micelles that are converted into long cylindrical micelles during silica hydrolysis and condensation. As a result, a silica matrix with hexagonally ordered mesopores is obtained, after removing the micelles by extraction or calcination. The interactions between the block copolymer and the various additives (silica, acids, salts, solvents) during the first steps of the synthesis in solution are believed to play an important role in the creation of these highly structured materials. Therefore, the emphasis of this thesis lays on providing fundamental information on the self-assembly process of the tri-block copolymer P123 (EO20PO70EO20), typically used in the synthesis of SBA-15, at conditions that mimic those of mesoporous materials synthesis as closely as possible.DelftChemTechApplied Science
Radius Bending: User Element Testing and Investigation on Effect of Stacking Sequence on Out-of-plane Failure
No full textA new doubly-curved shell element (ThickS4 element) is presented and tested for flat and singly curved configurations. The benchmark tests show good correlation for the ThickS4 element with the Abaqus S4 shell element and with 3D FEM for flat and highly curved configurations (R/t ≥ 4). For radius over thickness ratios smaller than 4 the element is not able to predict the correct behaviour. In order to give a good insight in the most critical radius over thickness ratios 1 ≤ R/t ≥ 8 a stacking sequence investigation has been done making use of the Abaqus C3D8 element. An L-shaped structure has been tested for different load combinations of in-plane, out-plane and opening-moment loading. From the investigation a clear overview of best stacking sequences for all the different loading combinations were presented as well as the ratio of ILNS versus ILSS. The results can further be used as guidelines for the initial design of composite C-spars and stringers.Aerospace EngineeringAerospace Structures & Material
Aerosol assisted synthesis of nanostructured silica
No full textZeolites are microporous aluminosilicates that have broad applications especially in industrial processes like fluidized catalytic cracking (FCC) owing to their unique properties with respect to both activity and selectivity. However, the micropores of zeolites may in some cases limit their catalytic performance due to restricted molecular transport induced by similar size of the diffusing hydrocarbons and the micropore size. This had led researchers to develop mesoporous silica materials (pore sizes in the range of 2 and 50 nm) as catalyst supports for enhanced molecular transport. Mesoporous silica are usually prepared using the conventional sol-gel synthesis which takes several days and the final morphology is often irregular. The present thesis deals with the use of a continuous aerosol reactor process involving evaporation induced self-assembly (EISA) that allows synthesis of mesoporous silica (using a tri-block co-polymer, P123 as a templating agent) within several seconds. The synthesis in general involves a large number of experimental parameters. In order to explore this high dimensional experimental space, a factorial design of experiments was employed to study the effect of important variables, namely the precursor composition and the tubular reactor temperature, on the textural properties of the final product. This methodology allows simultaneous investigation of the influence of multiple parameters, which is advantageous over the traditional form of experimentation in the nanomaterials community, where only one variable is changed at a time. It allows exploration over a wider range of conditions to highlight the true nature (global/local) of trends that are often misinterpreted as a universal occurrence in conventional experimental trials. Using contours, this method exclusively determined multiple conditions for achieving a required surface area and pore volume. It also illustrated the variation of these properties over a wider domain of experimental conditions. Additionally, novel mesoporous silica and silica-alumina materials were synthesized using a laboratory spray drier by self-assembly of nanosized silica and alumina particles, using P123 as a structure directing agent. The materials possessed extraordinary steam stability and showed good potential when their performance was tested in pulse cracking experiments. The method offers exciting opportunities for further industrial development as part of mesoporous zeolite composites.Applied Science
Address to Rotary, January 29, 1981
No full textAn Address to Rotary, by M.O. Morgan, January 29, 1981Title from captio
Talk to St. John's Rotary, Thursday, January 22, 1976
No full textTalk to St. John's Rotary by M.O. Morgan, Thursday, January 22, 1976Title from captio
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