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1
Musa, Mazlina. "Ionothermal synthesis of metal aluminophosphates." Thesis, University of St Andrews, 2014. http://hdl.handle.net/10023/4483.
Повний текст джерелаАнотація:
The aim of this thesis was to synthesise CoAPO-34 and FeAPO-34 using ionothermal synthesis in the presence of organic amines. Using this method provides an alternative route to prepare such materials under low pressure instead of the higher pressure associated with hydrothermal or solvothermal synthesis. Both materials have chabazite (CHA) topology and they are known to act as catalysts. CoAPO-34 was ionothermally prepared using 1-ethyl-3-methylimidazolium bromide (EMIMBr) in presence of 1, 6-hexadiamine (HDA). This study has found that when the synthesis was carried out without HDA, AlPO-11 was preferentially obtained instead of CoAPO-34. Broad line signals which appear between 2000 to 5000 ppm in both spin-echo ³¹P NMR spectra of as-synthesised and calcined CoAPO-34 confirm that the Co²⁺ ions have been successfully incorporated within the framework of the material. FeAPO-34 was synthesised under ionothermal conditions using 1-ethyl-3-methylimidazolium chloride in the presence of ethylenediamine (EDA). In the absence of EDA, the synthesis has produced AlPO-34 instead of FeAPO-34. Broad line signals that appear between 1000 to 14000 ppm in spin-echo ³¹P NMR spectra of both as-synthesised and calcined FeAPO-34 are direct evidence of isomorphous substitution of framework aluminum by Fe(II) or Fe(III). Another aim of this study was to explore the ionothermal synthesis of copper containing aluminophoshate of DNL-1 (Cu/DNL-1). This material was attractive to explore because it contains 20 ring extra-large pores and Cu(I) species in the channels of the framework, potentially giving material the ability to simultaneous store NO and to generate NO from NO₂⁻ anions. Cu/DNL-1 was successfully prepared under ionothermal conditions using EMIMBr and HDA. Without HDA in the synthesis, AlPO-11 was obtained. In this material, copper ions were not incorporated in the Cu/DNL-1 skeleton framework. This was confirmed by absence of broadline signal at >500 ppm in spin-echo ³¹P NMR spectrum of the sample. The copper ions are expected to be present as extra-framework cations. Extra-framework Cu(I) species that were formed by high temperature calcination of Cu/DNL-1 are active to produce NO from NO₂⁻. Therefore, the calcined Cu/DNL-1 can be used to simultaneously store and produce NO from nitrite. This has the potential to significantly extend the lifetime of gas delivery in the material to prevent thrombus formation.
2
Conway, John E. "Multi-frequency synthesis with MERLIN : a new technique in aperture synthesis imaging." Thesis, University of Manchester, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.328286.
Повний текст джерела
3
Dogan, Bahadir. "Synthesis And Characterization Of Semiconductor Nanowires Via Electrochemical Technique." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/3/12611335/index.pdf.
Повний текст джерелаАнотація:
This thesis aims to investigate structural, optical and photoelectrochemical behavior of CdS nanowires and their heterojunctions with CdTe and polypyrrole nanowires. In the first part, CdS nanowires have been synthesized via electrochemical template-based route. It has been observed that synthesis conditions, such as bias voltage and deposition time, affect the morphology, optical and photoelectrochemical characteristics of CdS nanowires. Depending on the deposition time, length of the CdS nanowires changed from 100-200 nm to 3-4 m. Also the diameter of the nanowires increased with increasing the deposition time. Structure of the CdS nanowires has been confirmed by X-ray diffraction spectrometry and EDX analysis. Phototelectrochemical performances of the CdS nanowires have been changed dramatically with bias voltage and deposition time.In the second part of this thesis, CdTe nanostructures have been deposited on CdS nanowires. Change in optical and photoelectrochemical behavior of CdS nanowires after CdTe deposition has been investigated. Organic semiconductors and their composites with inorganic materials have been gaining attention due to tunable optical, electrical and magnetic properties. Also, ease of fabrication techniques, and therefore, low cost made these materials attractive for lots of applications including photovoltaic devices and flexible electronics. In the last part of this thesis, heterojunctions of CdS and Polypyrrole (Ppy) nanowires have been synthesized. Like CdS/CdTe heteronanostructures, first the CdS nanowires have been electrochemically deposited in anodized alumina template and then Ppy has been successfully deposited on CdS nanowires. In order to investigate the effects of polypyrrole synthesis conditions on CdS/Ppy heteronanostructures, CdS nanowire synthesis conditions have been kept constant. It has been observed that morphology and photoelectrochemical behavior of the Ppy nanowires has been affected from Ppy synthesis conditions. The photoelectrochemical performance changes of CdS/Ppy heteronanostructures have been also investigated in this part.
4
Xie, Yan. "Switched-current filters and group delay equalizers using wave synthesis technique." Thesis, University of Southampton, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.416924.
Повний текст джерела
5
Zhang, Fan Mr. "Synthesis of Tadpole-Like Polystyrenes." University of Akron / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=akron1407376281.
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6
Biswas, Mahmud. "An Aperture Synthesis Technique for Cylindrical Printed Lens/Transmitarray Antennas with Shaped Beams." Thèse, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/24262.
Повний текст джерелаАнотація:
Printed lens antennas offer the possibility of realizing shaped beam patterns using no more complexity than is required for pencil beam patterns. Shaped beam patterns can be obtained by appropriately determining the complex transmission coefficient required for each cell (or element) of the printed lens, taking into account the varying feed field over the input surface of the lens. Certain ranges of transmission coefficient amplitude and phase are undesirable (eg. too low an amplitude implies a large reflection at the lens input surface). It would be preferable to constrain the range of values that the transmission coefficient can take as an integral part of the lens synthesis procedure, and thus the transmission coefficient itself needs to be the synthesis variable. In this thesis a synthesis technique for doing this is developed based on the method of generalized projections, modified to “operate” in the space of transmission coefficients. This makes it possible to immediately perceive what influence constraints on the actual transmission coefficients have on the possible radiation pattern performance. In addition, an approach that allows one to constrain the transmission coefficient to values that must be selected from an available database of transmission coefficients is incorporated into the synthesis technique.
7
Wang, Peng. "A Comprehensive Technique for Majority/Minority Logic Synthesis with Applications in Nanotechnology." University of Toledo / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1387934672.
Повний текст джерела
8
Brown-Kibble, Gennevieve Loren. "The "Alto Rhapsody" of Johannes Brahms: A synthesis of technique and expression." Diss., The University of Arizona, 2000. http://hdl.handle.net/10150/289179.
Повний текст джерелаАнотація:
In the name of scholarship, there has been a tendency to either downplay or ignore all together the emotional aspects that are often the driving force of creative undertakings. One does not have to do this with the music of Brahms, because expression and technique are not mutually exclusive. This study examined the integral connection between personal experience, text and music that is demonstrated so uniquely and emphatically in the Alto Rhapsody. The study began with a description of key events that shaped the musical and personal life of the composer: from the launching of his career in 1853 to the writing of his Alto Rhapsody in 1869. Brahms's relationship to the text of the Rhapsody, three central stanzas from Goethe's Harzreise im Winter, was discussed. The music was analyzed under the categories of formal design, texture, and motion. Each category featured a comparison between the Brahms setting and the earlier one which inspired it: Johann Friedrich Reichardt's 1790 version. Analysis of the formal design began by weighing the personal factors that influenced the two Rhapsodies . The means by which vocal and instrumental textures were used to enhance textual meaning were evaluated. The musical analysis concluded with a description of rhythmic, melodic and harmonic motion employed in the Alto Rhapsody. Viewed as a synthesis of personal experience, text and music, the Alto Rhapsody provided a unique opportunity to gain insight into various features of the composer and his art. This study explored the aspects of contrast, balance and emotional expression. Analysis of Brahms's Alto Rhapsody revealed significant relationships between the composer, his chosen text and the musical materials and methods used to compose the work. An understanding of these relationships can serve as the basis for informed interpretation, effective rehearsal and expressive performance.
9
Ledwell, Paul H. "A synthesis of form, color, and content in relief sculpture." Virtual Press, 1989. http://liblink.bsu.edu/uhtbin/catkey/724972.
Повний текст джерелаАнотація:
The successful combination of form, color, and content prior to the relief construction movement in the 1960's was usually associated with two-dimensional artwork. The problem, then was whether the artist could successfully combine form, color, and content in three-dimensional sculpture pieces.The content of the work described relates to the artist's personal experiences as an underground uranium miner through the medium of relief sculpture. The successful combination of form, color, and content conveyed the artist's mining experiences to a neophyte audience. The visual variety and motif in the work, however, will not be lost on any members of the audience who are also sculptors.The methods used by the artist included textbook research and studio experimentation to produce a series of pieces which would address the successful combination of form, color, and content. The research also included a study of other artists' use of shape and color in the relief sculpture format. The artist's findings were documented in the form of a thesis paper and also eight relief sculpture pieces which employed a combination of wood and paint. The paint was applied to the wood structure using a heavy impasto technique which completely obscures the wood and allows the artist to manipulate both form and color. The texture invites the viewer to explore the surface and shapes without consciously sorting out what materials are used in the construction of the sculpture.Department of Art
10
Meng, Xiangjun. "A synthesis technique for radial line slot array antennas with isoflux radiation patterns." Thesis, University of Ottawa (Canada), 2009. http://hdl.handle.net/10393/28325.
Повний текст джерелаАнотація:
In this thesis the possibility of using radial line slot array (RLSA) antennas to provide low profile isoflux radiation patterns suitable for use as circularly-polarized tracking, telemetry & command (TT&C) antennas on low Earth orbit (LEO) satellites is investigated. The RLSA antenna elements are slot pairs located on concentric circles on the top plate of a radial waveguide. Conventional synthesis techniques cannot be used due to the fact that the RLSA antenna is a non-uniformly spaced array, the elements do not all have the same orientation, and the excitation amplitudes and phases are linked to the actual physical location of a particular slot pair. A technique is therefore developed for synthesizing such an RLSA antenna.
Keywords: Antennas, Radial Line Slot Antennas, Isoflux Radiation Patterns
11
Kim, Jae-Keun. "Synthesis and characterisation of titanium nitride films using a dual ion beam technique." Thesis, University of Salford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.292883.
Повний текст джерела
12
Wybrow, Robert Anthony James. "Investigations towards the synthesis of (-)-histrionicotoxin via a tandem ring closing metathesis technique." Thesis, University of Sheffield, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.419328.
Повний текст джерела
13
Priimov, Gleb Urevich. "Synthesis, kinetic and mechanistic studies of substituted 2,2':6',2''-terpyridines and their metal complexes." Thesis, University of Warwick, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.340070.
Повний текст джерела
14
Brown, David. "The synthesis of amino acids by free radical methods." Thesis, University of Oxford, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.670245.
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15
Zhai, Jian Pang. "Synthesis and characterization of ultra-small single-walled carbon nanotubes produced via template technique /." View abstract or full-text, 2007. http://library.ust.hk/cgi/db/thesis.pl?CENG%202007%20ZHAI.
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16
Suthagar, J., and Kissinger J. K. Suthan. "Synthesis and Characterization of ZnSe1-xTex Alloy Thin Films Deposited by Electron Beam Technique." Thesis, Sumy State University, 2012. http://essuir.sumdu.edu.ua/handle/123456789/35012.
Повний текст джерелаАнотація:
ZnSe1-x Tex solid solutions were prepared and films were deposited on glass substrates with x 0.2, 0.4,
0.6 and 0.8. DTA/TGA analysis was carried out to study the alloy formation temperature. Structural studies
by XRD results showed the polycrystalline nature of the films. The Full Width at Half Maximum
(FWHM) values were observed from the XRD pattern and used to evaluate the microstructural parameters
like crystallite size, strain, dislocation density and stacking fault density for all the films with x 0.2, 0.4,
0.6 and 0.8. These films were coated with a thickness of about 200 nm on glass substrates keeping the
temperature constant at 200 C. All films showed cubic structure and the lattice parameter values are
found to vary with „X‟. This confirms the solid solution formation between the ZnSe and ZnTe binary compounds
which are found to obey Vegard‟s law. SEM and AFM studies have been arried out to observe their
surface modification with solid solution formation. Raman studies confirm the formation of ZnSe1-xTex compound
films.
When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/35012
17
Yayla, Ihsan. "Filter Design Software By Synthesis Method." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/3/12610279/index.pdf.
Повний текст джерелаАнотація:
In this study, Window-based computer program, named Synthesis Software, is developed for
designing filters with equal-ripple or maximally flat passbands and general stopbands by using
cascade synthesis technique in transformed frequency domain. Synthesis technique is applicable
to lumped element and commensurate line distributed element filters with Lowpass,
Highpass or Bandpass characteristics. Singly or Doubly terminated filters can be synthesized. friendly environment for typing in the parameters of the filter to be designed. This part uses
Synthesis and Plot parts as modules.
This software is based on the previous softwares developed in EEE Department of Middle
East Technical University. All the previous softwares were gathered in the well-known software
Filpro, which is in DOS environment, in Pascal. Thus, the new software is actually a
conversion of Synthesis part of Filpro from DOS environment into Windows environment in
the language C#, with some improvements in root finding algorithms for numerical conditioning.
Synthesis Software is has three parts. The first and main part is the implementation
of synthesis technique by using object oriented programming technique. In this way, synthesis
technique implementation is isolated from other parts of Synthesis Software and it can be
used by other filter design programs as a module. The second part of the program is responseplotting
section. In this part Insertion Loss, Return Loss, Time Delay, Phase and Smith Chart
responses are calculated and displayed. The last part is User Interface, which provides user
18
Moghe, Ameya S. "Synthesis and Gas Sensing Properties of MOD Ni-Zr02 Cermet Films on Silicon Substrate." University of Cincinnati / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1131983774.
Повний текст джерела
19
Bastos, Arrieta Julio. "Bifunctional nanocomposites: surface modification of reactive matrices with functional metal nanoparticles by intermatrix synthesis technique." Doctoral thesis, Universitat Autònoma de Barcelona, 2014. http://hdl.handle.net/10803/285551.
Повний текст джерелаАнотація:
En aquesta Tesi Doctoral s'ha desenvolupat la tècnica de Síntesi intermatricial (IMS),
com a una metodologia factible per la modificació de matrius reactives amb
nanopartícules (NPs) basada en les propietats d'intercanvi iònic de la superfície que es
vol modificar; com ara: resines intercanviadores iòniques i la innovació en la
modificació de nanofilms polimèrics funcionalitzats, nanotubs de carboni (CNTs) i
nanodiamantes (NDs).
L’efecte dels materials nanoestructutrats sobre el medi ambient és un dels temes més
importants a la tecnologia en els darrers anys. A causa del seu alt grau de
desenvolupament, producció, difusió i aplicació, les majors preocupacions associades
als Nanomaterials (NMs) inclouen: a) l'elevada reactivitat i toxicitat de molts NMs en
comparació dels seus anàlegs macroscòpics, b) l'absència de tècniques analítiques
òptimes per a la seva determinació en el medi ambient i c) l'absència d'una legislació
efectiva que regularitzi els nivells permesos de diversos NMs en sòl, aigua i aire. Per
això és primordial la seguretat i estabilitat dels NMs a través de la seva incorporació en
els Nanocomposites bifuncionals (BFNCs)
La bifuncionalitat dels BFNCs és determinada per les propietats pròpies de la matriu en
la qual les NPs metàl·liques (MNPs) són sintetitzades (per exemple polímers
d'intercanvi iònic) i per les propietats respectives de les MNPs (magnetisme, activitat
bactericida, nanocatlizadores). La modificació superficial de les matrius reactives amb
MNPs es porta a terme a través de la IMS acoblada a l'Efecte d'exclusió de Donnan
(DEE). D'aquesta manera, els BFNCs preparats amb valor afegit són caracteritzats, les
seves propietats són avaluades i es comprova l'estabilitat i la distribució favorable de les
MNPs principalment en la superfície dels BFNCs.
La IMS inclou diferents possibilitats per a la preparació de MNPs i BFNCs. En una
primera etapa es realitza un intercanvi iònic sobre la matriu per fixar els precursors de
les NPs. Posteriorment la IMS pot incloure: a) Reducció dels ions a l'utilitzar un agent
reductor com NaBH4 o b) precipitació de NMs com quantum dots (QDs) o òxids
metàl·lics a l'afegir el contraió respectiu. Sigui quina sigui la ruta que s'empri, els grups
funcionals d'intercanvi iònic propis de la matriu són regenerats; de manera que els cicles
de IMS poden repetir-se per augmentar el gruix de les MNPs o bé per produir MNPs
bimetàl·liques tipus core-shell. Una versió estesa de la IMS és presentada a l'utilitzar el
desplaçament galvànic com a precursor per Au- MNPs i AgAu-MNPs a matrius
catiòniques, utilitzant MNPs sintetitzades inicialment com nanoplantilles per a la
cristal·lització de les noves MNPs mono- o bi- metàl·liques.
Un avantatge molt important que aporta la tècnica IMS és la seva gran versatilitat,
possibilitant la síntesi de BFNCs amb les propietats desitjades per a les diferents
aplicacions: activitat bactericida, magnetisme, catàlisi heterogènia i electroquímica,
entre d'altres.En esta Tesis Doctoral se ha desarrollado la técnica de Síntesis Intermatricial (IMS), como una metodología factible para la modificación de matrices reactivas con Nanoparticulas(NPs) basada en las propiedades de intercambio iónico de la superficie que se desea modificar; tales como: como resinas intercambiadoras iónicas y la innovación en la modificación de nanofilms poliméricos funcionalizados, nanotubos de carbono (CNTs) y nanodiamantes (NDs). El efecto de los materiales nanoestructurados sobre el medio ambiente es uno de los temas más importantes de la tecnología en los últimos años. Dado su alto grado de desarrollo, producción, difusión y aplicación, las mayores preocupaciones asociadas a los Nanomateriales (NMs) incluyen: a) la elevada reactividad y toxicidad de muchos NMs en comparación con sus análogos macroscópicos, b) la ausencia de técnicas analíticas adecuadas para su determinación en el medio ambiente y c) la ausencia de una legislación efectiva que regularice los niveles permitidos de varios NMs en suelo, agua y aire. Por ello es primordial la seguridad y estabilidad de los NMs a través de su incorporación en los Nanocomposites Bifuncionales (BFNCs) La bifuncionalidad de los BFNCs es determinada por las propiedades propias de la matriz en la que las NPs metálicas (MNPs) son sintetizadas (por ejemplo polímeros de intercambio iónicos) y por las propiedades respectivas de las MNPs (magnetismo, actividad bactericida, nanocatlizadores). La modificación superficial de las matrices reactivas con las MNPs se lleva a cabo a través de la IMS acoplada al Efecto de Exclusión de Donnan (DEE). De esta manera, los BFNCs preparados con valor añadido son caracterizados, sus propiedades son evaluadas y se comprueba la estabilidad y la distribución favorable de las MNPs principalmente en la superficie de los BFNCs. La IMS incluye diferentes posibilidades para la preparación de MNPs en BFNCs. En una primera etapa se realiza un intercambio iónico sobre la matriz para fijar los precursores de las NPs. Posteriormente la IMS puede incluir: a) Reducción de los iones al utilizar un agente reductor como NaBH4 o b) precipitación de NMs como quantum dots (QDs) u óxidos metálicos al agregar el contraión respectivo. Sea cual sea la ruta que se siga, los grupos funcionales de intercambio iónico propios de la matriz son regenerados; por lo que los ciclos de IMS pueden repetirse para aumentar el grosor de las MNPs o bien para producir MNPs bimetálicas tipo core-shell. Una versión extendida de la IMS es presentada al utilizar el desplazamiento galvánico como precursor para Au- MNPs y AgAu-MNPs en matrices catiónicas, utilizando MNPs sintetizadas inicialmente como nanoplantillas para la cristalización de las nuevas MNPs mono o bimetálicas. Una ventaja muy importante que aporta la técnica IMS es su gran versatilidad, posibilitando la síntesis de BFNCs con las propiedades deseadas para las diferentes aplicaciones: actividad bactericida, magnetismo, catálisis heterogénea y electroquímica, entre otras.
In this Doctoral Thesis, the Intermatrix Synthesis (IMS) technique has been described as a feasible methodology for the modification of reactive matrices with Nanoparticles (NPs), which is based on the ion exchange properties of the NPs supporting surface, such as ion exchange resins and the innovation of the application of IMS on polymeric nanofilms, carbon nanotubes (CNTs) and nanodiamonds(NDs). The effects of nanostructured materials on the environment are one of the most important issues of technology in recent years. Given their high level of development, production, dissemination and application, the main concerns associated with nanomaterials (NMs) include: a) the high reactivity and toxicity of many NMs compared to their macroscopic analogues, b) the lack of appropriate analytical techniques for their determination in environment and c) the absence of effective legislation to regularize the convenient levels of various NMs in soil, water and air. Therefore, it is a must to ensure the security and stability of NMs through its incorporation into the Bifunctional Nanocomposites (BFNCs) The bifunctionality of BFNCs is determined by the specific properties of the matrix in which the metal NPs (MNPs) are synthesized (for example by ion exchange polymers) and by the respective properties of the MNPs (magnetism, bactericidal, nanocatlizadores). Surface modification of reactive matrices with MNPs is conducted through the IMS coupled to Donnan exclusion effect (DEE). Thus, the added value BFNCs prepared are characterized, their properties are evaluated and stability and the favourable distribution of the MNPs mainly on the surface of BFNCs is verified. The IMS includes different possibilities for the preparation of MNPs on BFNCs. In the first stage ion exchange is performed on the matrix to attach the NPs precursors. Subsequently, the IMS includes: a) Reduction of ions by using a reducing agent such as NaBH4 or b) precipitation of NMs as quantum dots (QDs) or metal oxides by adding the respective counterion. Whichever route is followed, the ion exchange functional groups of the matrix are regenerated; so IMS cycles can be repeated to increase the thickness of the MNPs or to produce bimetallic core-shell type MNPs. An extended version of the IMS is presented as using galvanic replacement for the preparation of Au- MNPs and AgAu-MNPs in cationic matrices using MNPs initially synthesized as nano-templates for crystallization of new mono or bimetallic MNPs. An important advantage provided by the IMS technique is its versatility, allowing the synthesis of BFNCs with the desired properties for different applications: bactericidal activity, magnetism, electrochemistry and heterogeneous catalysis, among others.
20
Mayo, Kevin A. "Definition and evaluation of a synthesis-oriented, user-centered task analysis technique: the Task Mapping Model." Diss., Virginia Tech, 1994. http://hdl.handle.net/10919/40167.
Повний текст джерелаАнотація:
A software system is an aggregate of communicating modules, and there are several different types of communication among these modules (direct, indirect, and global). Therefore, understanding the interfaces among these modules can characterize the system and are a major factor in the system's complexity. These interfaces could possibly also show and predict inadequacies in the reliability and maintenance of a system. Interfaces are defined early in the development life cycle at a detailed or high level design stage. Knowing that these interfaces exist and their structure leads us to measure them for an indication of the designed interface complexity. This designed interface complexity can then be utilized for software quality assurance by allowing users to choose from among several designs. With data provided by an Ada software developer, the interface complexity metrics correlated with established metrics, but also found complex interfaces that established metrics missed.Ph. D.
21
Smith, Steven D. "Synthesis of novel siloxane-containing block and graft copolymers by anionic polymerization and the macromonomer technique." Diss., Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/74770.
Повний текст джерелаАнотація:
The synthesis of novel well defined graft copolymers is now possible with the recent advent of the macromonomer technique. Copolymers with narrow molecular weight distributions of the backbone as well as the grafts are possible.
The anionic alkyl- lithium initiated ring opening polymerization of the hexamethylcyclotrisiloxane has been investigated to prepare polymers of controlled molecular weights and narrow molecular weight distributions. This technique was extended to the preparation of macromonomers and from these macromonomers the synthesis of graft copolymers.
These siloxane macromonomers were then incorporated into acrylic and styrenic copolymers via free radical and anionic techniques. A series of graft copolymers were characterized by a variety of methods. The resulting copolymers exhibit interesting thermal properties dependent on graft molecular weight and composition. Well-defined morphologies were observed by TEM analysis, indicative of the unique structures prepared.
Graft copolymers offer unique possibilities of structure property relationships, often forming two phase morphologies that give rise to properties of both constituents. This allows the preparation of polymers designed to give optimal characteristics.Ph. D.
22
Lisenkov, Aleksey. "Electrochemical synthesis of thin oxide films on titanium and aluminium surfaces using high voltage anodisation technique." Doctoral thesis, Universidade de Aveiro, 2017. http://hdl.handle.net/10773/22469.
Повний текст джерелаАнотація:
Doutoramento em Ciência e Engenharia de MateriaisA síntese eletroquímica de filmes finos de óxido usando a técnica de oxidação de alta tensão e a investigação da estrutura, propriedades físicas e químicas dos filmes obtidos são os principais objetivos desta tese. A anodização de metais sob a ação de vários kilovolts produz filmes com espessura pequena (até 180 nm) e com propriedades diferentes dos filmes formados usando técnicas eletroquímicas convencionais. As camadas de óxido depositadas desta forma conferem, frequentemente, melhores propriedades de proteção, semicondutoras e fotoeletroquímicas. No âmbito deste trabalho filmes finos sobre titânio e alumínio foram preparados em diferentes eletrólitos, incluindo soluções de ácidos e sais, bem como em água desionizada e peróxido de hidrogénio. Mostra-se que os filmes preparados por oxidação com descarga pulsada de alta tensão têm estrutura superficial e propriedades elétricas mais uniformes em comparação com os obtidos por anodização convencional. Outro objetivo do trabalho é a dopagem dos filmes anódicos com diferentes dopantes, por incorporação de espécies do eletrólito durante a formação do filme. Os filmes preparados por oxidação de descarga pulsada de alta tensão no titânio mostram uma melhor resposta de fotocorrente a comprimentos de onda pequenos e uma concentração mais baixa de dadores ionizados, relativamente aos filmes obtidos por anodização convencional. Os filmes preparados por descarga no alumínio e titânio são formados por uma camada compacta. Estudos sobre o processo de descarga revelaram que o principal fator que influencia a cinética de crescimento do filme de óxido é a concentração de defeitos pontuais, que por sua vez é determinada pela composição do eletrólito. Também se mostrou que as técnicas usando alta tensão permitem preparar filmes anódicos não só em soluções convencionais, mas igualmente em outros meios, tal como água desionizada, água destilada e peroxido de hidrogénio, onde a anodização por métodos convencionais (potenciostático ou galvanostático) é impossível. Além disso é revelado que a técnica da descarga pulsada de alta tensão é um método eficiente para encapsulação de nanocilindros de metal, preliminarmente depositados em nanoporos de titânia e alumina alinhados verticalmente.
Electrochemical synthesis of thin oxide films by using the high-voltage oxidation technique and investigation of structure, physical and chemical properties of the obtained films are the main objectives of this thesis. Anodisation of metals under action of several kilovolts allow to produce films with rather low thickness (up to 180 nm) and with properties different from the films created by using conventional electrochemical approaches. The oxide layers deposited in this way often confer advanced protective, semiconductor and photoelectrochemical properties. In the frame of this thesis thin films on titanium and aluminium were prepared in several electrolytes, including solutions of acids and salts as well as in deionised water and hydrogen peroxide. It is shown that the films prepared by powerful pulsed discharge oxidation are characterized by more uniform surface structure and electrical properties in comparison to those obtained by conventional anodization. Another aim of the work is doping of the anodic films with different dopants by incorporation of species from the electrolyte during the film formation. Films prepared by powerful pulsed discharge oxidation technique on titanium demonstrate a significantly improved photocurrent response at short wavelengths and an essentially lower concentration of ionized donors as compared with the films obtained by conventional anodization. The discharge-prepared films on both aluminium and titanium are composed by one compact layer. Studies of the discharge processes revealed that the main factor influencing the kinetics of the oxide film growth is the concentration of point defects which, in turn, is determined by the composition of electrolyte. Also, it was shown that the high voltage techniques allow to prepare anodic films not only in conventional solutions, but also in other media such as deionised water, distilled water and hydrogen peroxide, where anodisation by conventional (potentiostatic or galvanostatic) methods is impossible. Furthermore, the powerful pulsed discharge technique is shown as efficient method for encapsulation of metal nanorods preliminarily deposited into the vertically aligned titania and alumina nanopores.
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Richter, Frank. "Development of the Solution-Spray Flash-Vacuum-Pyrolysis Technique in the Synthesis of Allenyl Isothiocyanates and Synthesis of Complex 2-Amino-1,3-thiazole Derivatives." Doctoral thesis, Universitätsbibliothek Chemnitz, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-175339.
Повний текст джерелаАнотація:
Gas-phase thermolysis is a long-known and well established method for the preparation of reactive species. It is, however, limited to relatively volatile substances, which are easily vaporised. In the present work, the solution-spray technique for preparative scale was developed. With this technique, it is possible to subject low-volatile substances, which hardly vaporise even under high-vacuum conditions, to gas-phase thermolysis. By utilising oil nozzles used in heating and burner systems, it was possible to integrate a stable solution-spray into the existing flash-vacuum-pyrolysis system. The influence of several variables, such as flow-rate, pressure, temperature and solvent was determined. The solution-spray technique was applied in [3,3]-sigmatropic rearrangements of certain propargyl thiocyanates to the corresponding allenyl isothiocyanates. Furthermore, the parent compound propa-1,2-dienyl isothiocyanate was reacted with various sterically demanding primary and secondary amines to form 2-amino-1,3-thiazoles in moderate to excellent yields. Based on this, a catalyst-free four-center three-component reaction was developed. 2-Amino-1,3-thiazoles with complex substituents in 5-position at the heterocyclic ring are formed. Reaction mechanisms are discussed to explain the occurance of a highly substituted 1,3-thiazine structure. The influence of reaction temperature, concentrations and solvent were determined and are also discussed. It was shown that 2-amino-5-methyl-1,3-thiazoles are the apparently first aromatic substance class, that readily undergoes Prins-type 1,3-dioxane ring-formationDie Gasphasenthermolyse ist eine lang bekannte und etablierte Methodik zur Synthese reaktiver Spezies. Sie ist allerdings auf flüchtige Substanzen mit einer guten Verdampfbarkeit beschränkt. Für schwerflüchtige Verbindungen, welche sich selbst im Hochvakuum nur mäßig oder gar nicht in die Gasphase bringen lassen, wurde in der vorliegenden Arbeit die Solution-Spray-Technik für die Anwendung im präparativen Maßstab entwickelt. Unter Verwendung von Ölzerstäuberdüsen, wie sie in der Heizungs- und Brennertechnik Anwendung finden, wurde die Erzeugung eines stabilen Lösungs-Sprays in die vorhandene Blitzvakuumpyrolyse-Technik integriert. Der Einfluss verschiedener Variablen, wie Flussrate, Druck, Temperatur und Lösungsmittel wurde untersucht. Die Solution-Spray-Technik wurde für die [3,3]-sigmatrope Umlagerung bestimmter Propargylthiocyanate zu Allenyl-isothiocyanaten angewendet. Des Weiteren wurde Propa-1,2-dienylisothiocyanat – das einfachste Allenylisothiocyanat – mit diversen sterisch anspruchsvollen primären und sekundären Aminen in mäßigen bis exzellenten Ausbeuten zu 2-Amino-1,3-thiazolen umgesetzt. Darauf aufbauend konnte eine Vier-Zentren-drei-Komponenten-Reaktion entwickelt werden. Es entstehen in hohen Ausbeuten 2-Amino-1,3-thiazole mit komplexen Substituenten an der 5-Position des Heterocyclus. Reaktionsmechanismen werden diskutiert um die alternative Bildung einer hochsubstituierten 1,3-Thiazinstruktur zu erklären. Der Einfluss von Reaktionstemperatur, Konzentration und Lösungsmittel auf das Produktverhältnis wurde ebenfalls untersucht und wird diskutiert. Es konnte gezeigt werden, dass 2-Amino-5-methyl-1,3-thiazole als offenbar erste aromatische Substanzklasse sehr gute Substrate für die Bildung von 1,3-Dioxanen nach Prins darstellen
24
Wanigasekara-Mohotti, Don Kripalath. "Optimisation for the synthesis of mineral processing flowsheets." Thesis, The University of Sydney, 1999. https://hdl.handle.net/2123/27597.
Повний текст джерелаАнотація:
‘Minerals’ is a heuristic—based computer aided design system that implements an evolutionary design methodology to synthesise mineral beneficiaring flowsheets. It has been under developement at the University of Sydney since the 1970s by various post graduate students under the guidance of Professor R. G. H. Prince. In its previous development phases, the models were improved and new process units added. As a consequence, the optimiser used by ‘Minerals’ was no longer able to function properly and a “make do” optimser was implemented.
25
Atluri, Lava Kumar. "Design Automation Flow using Library Adaptation for Variation Aware Logic Synthesis." University of Cincinnati / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1397466797.
Повний текст джерела
26
Prince, Rosalie Scott. "Software synthesis - representation and success : an exploration of the impact of representational technique on the attitude and performance of expert MIDI users transferring to a software synthesis environment." Thesis, Durham University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.342752.
Повний текст джерела
27
Saltoglu, Ilkay. "Synthesis And Characterization Of Zirconium Based Bulk Amorphous Alloys." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/1260455/index.pdf.
Повний текст джерелаАнотація:
In recent years, bulk amorphous alloys and nanocrystalline materials have been synthesized in a number of ferrous and non-ferrous based alloys systems, which have gained some applications due to their unique physico-chemical and mechanical properties. In the last decade, Zr-based alloys with a wide supercooled liquid region and excellent glass forming ability have been discovered. These systems have promising application fields due to their mechanical propertieshigh tensile strength, high fracture toughness, high corrosion resistance and good machinability. In this study, the aim is to model, synthesize and characterize the Zr-based bulk amorphous alloys. Initially, theoretical study on the basis of the semi-empirical rules well known in literature and the electronic theory of alloys in pseudopotential approximation has been provided in order to predict the potential impurity elements that would lead to an increase in the GFA of the selected Zr-Ni, Zr-Fe, Zr-Co and Zr-Al based binary systems. Furthermore, thermodynamic and structural parameters were calculated for mentioned binary and their ternary systems. According to the theoretical study, Zr67Ni33 binary system was selected and its multicomponent alloys were formed by adding its potential impurity elements
Mo, W and Al. Centrifugal casting method was used to produce alloy systems. Structural characterizations were performed by DSC, XRD, SEM and EDS methods. In the near-surface regions of Zr60Ni25Mo10W5 and Zr50Ni20Al15Mo10W5 alloys, amorphous structure has been observed. Experimental studies have shown that Zr-Ni based systems with impurity elements Mo, W and Al, not widely used in literature, might be good candidates for obtaining high GFA.
28
Mondal, Rajib. "Synthesis and Study of Higher Poly(Acene)s: Hexacene, Heptacene, and Derivatives." Bowling Green, Ohio : Bowling Green State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=bgsu1187812264.
Повний текст джерела
29
Pandya, Sneha G. "Modification of Inert Gas Condensation Technique to Achieve Wide Area Distribution of Nanoparticles and Synthesis and Characterization of Nanoparticles for Semiconductor Applications." Ohio University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1458300732.
Повний текст джерела
30
Chen, Jhih-Rong, and 陳之容. "Texture Synthesis Using Data Mining Technique." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/48354363991458229077.
Повний текст джерелаАнотація:
碩士國立東華大學
資訊工程學系
92
We present a new texture synthesis algorithm, which combines texture synthesis with data mining technique. And our approach works well for many types of textures without any knowledge of their physical information process. Our approach first analyzes input texture to construct patch candidate data, and then we use this data to find frequent pattern sequences for synthesis results by using data mining technique─Sequential Pattern Mining.
31
Chang, Hsiao-Yi, and 張筱懿. "Using Texture Synthesis Technique on Relief Mapping." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/00838545268438890549.
Повний текст джерелаАнотація:
碩士大同大學
資訊工程學系(所)
97
Parallax occlusion problem in relief mapping is often happened when the depth scale is enlarged or the height-field gradient changed significantly. This paper presents a method to ameliorate this problem. The main idea of the method is to compute a solid texture over the entire new visual surface. This could avoid texture stretch artifacts and discontinuities. In order to get more accurate results, we also combine the normal-based curved silhouette (NCS) for silhouette rendering.
32
Wei, Shih-Syuan, and 魏士軒. "Synthesis of GaN Structures Using MOCVD Technique." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/74328531922421505621.
Повний текст джерелаАнотація:
碩士國立臺灣科技大學
材料科技研究所
96
Gallium nitride(GaN) structure were grown by metalorganic chemical vapor deposition using trimethylgallium (TMGa) as source material for Ga, ammonia (NH3) as source material for nitrogen. For one dimensional nanostructure growth, Si(111)、sapphire and GaN / sapphire with Au as substrates. TMGa/NH3 system would from GaN 1D nanostructure by decreasing feed ratio of Ⅴ/Ⅲ to 187. Heating the substrate until its temperature was 750℃ would form GaN 1D nanostructure, and when temperature below 750℃ then we can not find any GaN 1D nanostructure. sapphire and GaN / sapphire with Au as substrates suppresses the growth of GaN 1D nanostructure. For GaN thin film growth, The presence of a ZnO nucleation layer improves the epitaxial growth of GaN on sapphire substrates was effective at reducing the dislocation density of GaN epitaxy. At an injection current of 20 mA, an InGaN blue LED device fabricated with the ZnO nucleation layer exhibited an external quantum efficiency of 10.92%.
33
Liu, Pin-Cheng, and 劉品呈. "A Generic Component-Based Model Synthesis Technique." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/07331327362045563372.
Повний текст джерелаАнотація:
碩士國立勤益科技大學
電子工程系
103
In this paper, we have proposed a component-based 3D model synthesis system. In the new system, the user is able to design a new model by assembling available mesh components from two or more models. Such technique is often applied to increase the variation of a type of object for a large population. With our technique, we may create characters such as the legendary Minotaur, centaur, mermaid, as well as some illusionary figures in science fictions, movies, or computer games.
34
Yu, Kai-Jun, and 游凱鈞. "Virtual Car Sound Synthesis Technique for Electric Vehicles." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/s7ucjx.
Повний текст джерелаАнотація:
碩士國立彰化師範大學
車輛科技研究所
106
Car sounds are indispensable in idling or driving. Many major electric vehicle brands have developed due to environmental awareness. Because the electric car so quiet, drivers or other people are at risk for injury by being struck by a vehicle they cannot hear. This study develops internal combustion engine simulated sound for electric vehicles. The electric car will retain the combustion engine sound using the Arduino Uno as the experimental sound platform. Two kinds of experiments were conducted with the PAM8403 small power amplifier simulated engine exhaust sound . Simulated engine sound varied with the output of the variable resistance. The advantage of this approach is that it increases the safety of motorists and pedestrians, while achieving energy savings and zero environmental pollution.
35
Agrawal, Binit Kumar. "Synthesis of Multiferroic $BiFeo_3$ Material by Autocombustion Technique." Thesis, 2009. http://ethesis.nitrkl.ac.in/1315/1/synthesis_of_multiferroic_BiFeO3_material_by_autocombustion_technique.pdf.
Повний текст джерелаАнотація:
One of the most widely used and useful method of preparation of BFO is the combustion synthesis route using a fuel.The fuel used may be glycine ,citric acid or urea.the precursor material used for the synthesis of BFO by autocombustion route are $BiNO_3$ and $FeNO_3$ solutions with a certain concentration level. Combustion synthesis is becoming one of the most popular methods for the preparation of a wide variety of materials, .The main advantage of using this tchnique is due to the simplicity, the broad applicability range, the self-purifying feature due to the high temperatures involved, the possibility of obtaining products in the desired size and shape. This method is rapidly emerging as one of the most-convenient methods for the preparation of oxide materials. An aqueous solution of a redox system constituted by the nitrate ions of the metal precursor, acting as oxidizer, and a fuel like urea, glycine, citric acid or many others is heated up to moderate temperatures and, upon dehydration, the strongly exothermic redox reaction develops, which is generally self-sustaining and provides the energy for the formation of the oxide.
The XRD structure of the synthesized sample was taken after calcination.
36
Li, Dongsheng. "Synthesis of metal nanoparticles by microwave-assisted solvothermal technique." 2005. http://etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-957/index.html.
Повний текст джерела
37
C, Atzori. "Novel Ce3+ and Ce4+ Metal-Organic Frameworks: a multi-technique characterization." Doctoral thesis, 2018. http://hdl.handle.net/2318/1692942.
Повний текст джерелаАнотація:
The present thesis concerns the core activities of my three years of PhD studies: the synthesis of novel Metal-Organic Frameworks (MOFs) and their characterization using a multi-technique approach. The activities of my laboratory (NIS center at the Università di Torino) are focused on the characterization of materials and their surfaces using a wide range of techniques, mainly spectroscopies. In order to develop the synthetic skills required for the present research I spent a period of 3 months abroad in the laboratory of Prof. Stock in Kiel (Germany), whose research interests are mainly devoted to synthesis of new MOFs. The skills acquired in that period were applied to the development of the synthetic procedure of each material reported in the present document. The “trait d’union” of this thesis is the use of cerium cations in Metal-Organic Frameworks. This metal, albeit uncommon in the current MOF literature, is characterized by a high availability and a peculiar chemistry which permitted to obtain equally peculiar MOF compounds. The following work is articulated into: 1) Introduction section, where MOFs will be described in general together with the main synthetic methods and characterization techniques used in the field and a fast survey on the main applications where MOFs play a role; 2) Synthetic procedures and Experimental methods; 3) Results presented in four different sections, each one devoted to a different material; 4) Conclusions.
38
BARTHWAL, AYUSHI. "DESIGN OF MICROSTRIP LINE COUPLER WITH IMPROVED DIRECTIVITY." Thesis, 2016. http://dspace.dtu.ac.in:8080/jspui/handle/repository/14459.
Повний текст джерелаАнотація:
Abstract
In this project, a symmetrical microstrip line directional coupler has been designed
using the synthesis technique. The introduced design procedure does not require the
prior knowledge of the physical geometry of the coupler and requires only the
information of the port impedances, coupling level, and operational frequency. The
width of coupled microstrip lines, spacing between them and length of the coupler is
then determined.
The directivity of the conventional coupler designed is improved by bringing
the changes in the physical geometry of the coupler by phase velocity compensation,
which utilizes the coupled microstrip with square wiggles on its inner edges.
In this project, a directional coupler has to be designed at the operational
frequency of 1.5GHz with the coupling of -15dB. The width, length and spacing of
coupled microstrip line are calculated with the help of Agilent ADS linecalc and
then S-parameters of this coupler are calculated. The layout is plotted down in the
layout window and is simulated. Then, the changes in the geometry of the coupler
are made in order to improve the isolation and thus the directivity. The change in
geometry raises the odd mode inductance more strongly than that of even mode and
this results in phase velocity compensation between even- and odd-modes.
The coupler is designed on Rogers-R03210 substrate with dielectric constant
of 10.2 and thickness of 0.5mm. The simulations are carried out with the help of
software Agilent Advanced Design System 2008.
39
Chiang, Wel-Lun, and 江瑋倫. "Synthesis of Mg-based amorphous composites by mechanical alloying technique." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/06252301844722657542.
Повний текст джерелаАнотація:
碩士大同大學
材料工程學系(所)
98
This study examined the amorphization behavior of Mg-based alloy powders synthesized by mechanically alloying and the feasibility of consolidation by vacuum hot pressing. The crystallization structure, microstructure and thermal stability during mechanical alloying of as-milled powder were investigated by X-ray diffraction, scanning electron microscopy and differential scanning calorimetry, respectively. After 11-hour milling, Mg-Cu-Ni system amorphous powders exhibited a wide supercooled liquid region of 43K before crystallization. As the results demonstrated, the small addition of Ni improved the glass forming ability(GFA) of Mg-based amorphous alloys, which is better then the small addition of Ti. The as-milled（Mg65Cu35）92Ni8 powders were consolidated at 260℃ under a pressure of 1.2GPa by hot pressing into disc compacts with a diameter and thickness of 10 and 1 mm, respectively. Its microhardness and porosity percentage are 431Hv and 2.35%, respectively. With increasing the isothermaltime, the density and microhardness of these alloys decrease.
40
Yang, Chih-Min, and 楊智閔. "Synthesis of Cu-based amorphous composites by mechanical alloying technique." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/52766165558675858716.
Повний текст джерелаАнотація:
碩士大同大學
材料工程學系(所)
98
This study examined the amorphization behavior of Cu-based alloy powder synthesized by mechanical alloying technique and the feasibility of consolidation by vacuum hot pressing. The phase stabilities of as-milled powders were investigated by DSC measurement at 20℃/min. The supercooled liquid region(ΔTx) of the senary alloys is 42K for (Cu47Ti33Ni17Sn2Si)95Ta5 , 375K for (Cu47Ti33Ni17Sn2 Si)95C5 and 49K for (Cu47Ti33 Ni17Sn2Si)95Nb5 respectively. The (Ta or Nb or C)/Cu-Ti-Ni-Sn -Si composites were synthesized by milled 6.5hr for the quinery Cu-Ti-Ni -Sn-Si composition and then mixed wth Ta,Nb,or C elements for half . hour .The ΔTx of these composition is 47K for 5%Ta/95%(Cu47Ti33Ni17 Sn2 Si) , 40K for 5%C/95%(Cu47Ti33Ni17Sn2 Si) and 37K for 5%Nb/ 95% (Cu47Ti33Ni17Sn2 Si),respectively.The microhardness of the bulk senary amorphous alloys is 386HV for 5%Ta/95%(Cu47Ti33Ni17Sn2 Si),349HV for 5%C/95%(Cu47Ti33Ni17Sn2 Si) and 452HV for 5%Nb/95% (Cu47Ti33Ni17Sn2 Si) respectively. As the results demonstrated,the microhardness and density for the quinary amorphous alloys embedded with elemental particles, these for the senary amorphous alloys are higher than them.
41
Hsieh, Yi-Bo, and 謝逸博. "Language Learning System for Hearing Impaired Using Speech Synthesis Technique." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/71272607064866342326.
Повний текст джерела
42
White, Jeremiah David Edward. "Combustion based technique for synthesis and joining of refractory materials." 2009. http://etd.nd.edu/ETD-db/theses/available/etd-08252009-041045/.
Повний текст джерелаАнотація:
Thesis (Ph. D.)--University of Notre Dame, 2009.Thesis directed by Alexander S. Mukasyan and Paul J. McGinn for the Department of Chemical and Biomolecular Engineering. "August 2009." Includes bibliographical references (leaves 116-122).
43
Liou, Wei-ting, and 劉瑋婷. "Video Matting Technique used in the Background Synthesis of Movies." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/28535325376799892480.
Повний текст джерелаАнотація:
碩士朝陽科技大學
資訊管理系碩士班
100
Video matting technique is a technique used in the movies production and image synthesis which needs a lot of people operating and expensive cost in the past. For the extraction of the foreground object, it is difficult to deal with perfectly if they are hairs or complicated edges. If the extraction did not handle well, after the synthesis it will easy to be recognized that the one is a faked composited image or movie. Currently the main challenge of video matting technique is how to accurately estimate the transparency (i.e., alpha value) of each pixel value and the alpha matte of each frame so that people do not see that it is a composite image or movie after it was synthesized with the new background. In the paper, we proposed a Closed-Form infrastructure image matting technique which is able to estimate precise alpha value of each pixel. Next, the method explores the Probability Density Function algorithm to estimate alpha values more precisely than before, and then it is extended to video matting. As for video matting, the optical flow technique is joined to automatically estimate the alpha matte and accurately extract the foreground object. Experiments show that the proposed method is not only be able to use in the different images but also can precisely estimate alpha matte for each frame, and then the synthesized movie can reach a certain quality.
44
Li, Shih-Tin, and 李詩婷. "Synthesis and simulation of tripeptides by using solid-phase technique." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/44697169388112826919.
Повний текст джерелаАнотація:
碩士龍華科技大學
工程技術研究所
100
In this work, a solid-phase peptide synthesis (SPPS) was used to prepare tri peptide. The synthesis products include GHK, HGK, and GKH sequences. The synthesis process, purification, and simulation were explored for the tripeptide. In here, the optimum parameters were investigated for GHK by changing the coupling time and concentration of amino acids. Simulation for the three peptides can be used to study the molecular dynamic property. The results showed hat the ratio of yields and purities for three peptides, GHK:HGK:GKH, are 45.20:8.52:14.37 for yield and 97.94:52.07:100 for purity, respectively. This indicated the product GHK in here is comparable with market product. In addition, different syntheses for auto-process and by hand are also compared. The result showed that the yield and purity for both are 45.20:40.01 for yield and 96.78:57.22 for purity, respectively. This was due to impurity presented in hand-process on one hand, while the impurity can be removed in auto-process on the other hand. Purification was also carried out in here by using HPLC with C18-LiChroprep Column. The peaks are 5.07min, 4.67min, and 4.10 min for GHK, HGK, and GKH, respectively. Finally, the Discovery Studio simulator is used to calculate bond energy, angle energy, van der Waals force, roatation energy, potential energy and total energy of the three peptides for the comparison of the stability of peptides. The result shows that the stability for GHK is prior to the others indicating that the synthesis are prone to as compared with others. In addition, the simulation results also show the strength of HPLC peaks and the amount of products of the three peptides. The amount of products and peaks for GHK are always higher as compared with the others.
45
Das, Suraj Kumar. "Synthesis and Characterization of BST Ceramics by Solution Combustion Technique." Thesis, 2011. http://ethesis.nitrkl.ac.in/2570/1/suraj_kumar_das_big_thesis.pdf.
Повний текст джерелаАнотація:
Barium Strontium Titanate (Ba0.6Sr0.4TiO3) has been prepared and characterized in this present study. Phase pure BST powder has been prepared following combustion synthesis technique. Citric acid, ethylene glycol and glycine have been used as a fuel in this combustion process. Different process parameters mainly additional NH4NO3, citric acid as fuel amount, additional chelating agent EDTA and pH of the precursor solution has been optimized with an aim to achieve phase pure BST at a low temperature. Effect of mixed fuel i.e. citric acid + ethylene glycol and citric acid + glycine, has also been studied as a function of powder morphology of BST powder. The optimum precursor combination Metal: Citric Acid: Ammonium Nitrate: EDTA are: 1:1.5:12:0.1 at pH of the precursor solution 7, has been found to yield phase pure BST powder at 800oC. The densification behavior and densification kinetics of the BST powder has also been studied. Powder morphology and microstructure of sintered BST samples was found to depend strongly on the fuel used for combustion. Dielectric behavior of BST samples has also been studied as a function of fuel used.
46
Kuo, I. Sung, and 郭逸嵩. "Synthesis of Few-layered Tungsten Ditelluride Nanostructures by Using Colloidal Synthesis Technique and Their Piezocatalysis Properties." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/brectp.
Повний текст джерела
47
Basa, Meera. "Synthesis & Characterization of Silica Coated Iron Oxide Nanoparticles by Sol-Gel Technique." Thesis, 2009. http://ethesis.nitrkl.ac.in/153/1/meera_e_thesis%5B1%5D.pdf.
Повний текст джерелаАнотація:
\alpha$-Fe_2O_3$ nanoparticles and Silica Coated $Fe_2O_3$ Particles were synthesized by hydrothermal method and acid - base hydrolysis of TEOS respectively. The Core Shell Particles has been characterized by SEM, XRD, and Particle size analysis. From particle size analysis, it was seen that, the distribution maxima of $Fe_2O_3$ and $Fe_2O_3@SiO_2$ coated nanoparticle were of 120 & 350 nm, 150nm & 550 nm respectively. From XRD analysis, it was confirmed that silica sample nanoparticles is amorphous in nature.The SEM/EDX analysis data represents the presence of $Fe_2O_3@SiO_2$ and show only the compositions of $Si ,O & Fe2O_3$ peaks. As $Fe_2O_3$ nanoparticles show applications in many fields including high density magnetic storage devices, ferrofluids, magnetic refrigeration systems, and catalysis. Aggregation of nanoparticles can be prevented by coating the particles with other materials. The core/shell structure enhances the thermal and chemical stability of the nanoparticles, improves solubility, makes them less cytotoxic and allows conjugation of other molecules to these particles.
48
Wei-YiCheng and 鄭為溢. "Synthesis and Placement of Digital MicrofluidicBiochips Using Deferred Decision Making Technique." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/81615003880107457827.
Повний текст джерелаАнотація:
碩士國立成功大學
電機工程學系碩博士班
99
Although several researches have been done on droplet-based microfluidic biochips, there exist limited works considering microfluidic module placement problem due to its great complexity. In such problem, we should determine an optimized schedule of bioassay operations, bind assay operations to resources, and create a 3D fixed outline layout. To deal with these issues, we use a shape curve set to record placement results in 3D space and show how to merge two curve sets to enumerate possible placements in a general slicing tree. In our method, the resource binding and 3D placement can be done simultaneously. Furthermore, we propose a procedure to check violations of precedence constraints while merging, and then present a method to modify violations so that we have a higher probability to get good solutions. Finally, we introduce properties of resource operations and resource operation placement. In addition, we purpose a method to eliminate violation of resource constraints and ensure final result satisfy storage unit constraints. Experimental results demonstrate that our approach is more efficient and effective compared with the unified synthesis and placement framework and T-tree based approach.
49
Shih-Ping, Chen, and 陳詩平. "Synthesis of composite filmsfor graphite protection using chemical vapor deposition technique." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/23213778464511869860.
Повний текст джерелаАнотація:
碩士國立臺灣科技大學
化學工程系
93
The purpose of this research is to grow silicon carbide/silicon nitride composite films using TMS (tetramethylsilane), ammonia and hydrogen as the reactant gases by chemical vapor deposition. The reactant feed ratio of TMS/NH3 were varied from 0.75 to 24,the composition ratio of Si-C/S-N in the films were increasing from 0.9 to 6, the corresponding theoretical thermal expansion coefficient of films were varied from 4.6 to 4.75. It was found that this first gradient layer was familiar with graphite substrate at 1000℃ and PTMSNH3 = 3. When temperature in the range of 1000 to 1165℃ to fabricate other serial gradient layers. Then, the substrate treated with the CVI process at 700℃, TMS partial pressure of 14.6 × 10-2 Torr NH3 = 0.5sccm and reaction time = 55min. The gardinet layer (2.8μm) is grow on graphite. Finally, grow thickness 5μm on top layer. This process makes the weight loss of sample below 3% under the 16 cycles of thermal shock test in air atmosphere (1000℃). After 220 cycles of thermal shock test in ammonia atmosphere (1200℃), there were a few cracks in SiC coating film observed by optical microscope and the weight loss was unapparent.
50
Lin, Wan-Chi, and 林婉琪. "Karaoke effect and virtual bass synthesis using the phase vocoder technique." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/93727286399925383238.
Повний текст джерелаАнотація:
碩士國立交通大學
機械工程系所
94
Audio effects, such as time stretching, pitch shifting, frequency scaling, vibrato and tremolo are indispensable in music production and performance. Some of them are available for home entertainments and Karaoke systems. These digital audio effects are accomplished through the discrete-time signal process. Concerning the poor performance of the low frequency signal in a general speaker, the virtual bass synthesis technique has been implemented to enhance the low frequency sensation without using an extra sub-woofer or damaging the speakers. Due to the physical limitation of a general speaker, the low frequency components of an audio signal can not be well performed. The solution to this problem is to generate a series related super harmonics so as to substitute the low frequency. Taking listening intensity into consideration, the equal loudness contour is proposed to determine the different weighting for the each related harmonic. Subjective listening tests were carried out to explore the performance of the sounds, and the data will be analyzed to justify the statistical significance.