Дисертації з теми "Partial heating"
Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями
Ознайомтеся з топ-41 дисертацій для дослідження на тему "Partial heating".
Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.
Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.
Переглядайте дисертації для різних дисциплін та оформлюйте правильно вашу бібліографію.
Partain, Seth Collins. "Fused deposition modeling with localized pre-deposition heating using forced air." Thesis, Montana State University, 2007. http://etd.lib.montana.edu/etd/2007/partain/PartainS0507.pdf.
Повний текст джерелаTrtílek, Petr. "Predikovaná a skutečná spotřeba energie v budovách." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2020. http://www.nusl.cz/ntk/nusl-409962.
Повний текст джерелаTaipe, Stiw Harrison Herrera. "Modelagem computacional do escoamento bifásico em um meio poroso aquecido por ondas eletromagnéticas." Universidade Federal de Juiz de Fora (UFJF), 2018. https://repositorio.ufjf.br/jspui/handle/ufjf/6519.
Повний текст джерелаApproved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2018-03-28T16:44:29Z (GMT) No. of bitstreams: 1 stiwharrisonherrerataipe.pdf: 5886256 bytes, checksum: 4fa85d1d9808790a2f5c85bb6c6c8d8d (MD5)
Made available in DSpace on 2018-03-28T16:44:30Z (GMT). No. of bitstreams: 1 stiwharrisonherrerataipe.pdf: 5886256 bytes, checksum: 4fa85d1d9808790a2f5c85bb6c6c8d8d (MD5) Previous issue date: 2018-01-26
CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Neste trabalho estamos interessados em estudar, mediante simulações computacionais, se o aquecimento eletromagnético é capaz de melhorar o deslocamento do óleo pela água. Nesta direção, nos baseamos nos resultados obtidos pela equipe da TU Delft da Holanda, que desenvolveu experimentos de laboratório que demonstravam a distribuição da temperatura em um meio poroso, onde o óleo está sendo deslocado pela injeção de água, gerada por aquecimento eletromagnético. Para tanto, definimos o modelo matemático que governa o problema em questão regido por equações diferenciais parciais das leis de conservação de massa e energia. Assim, partindo da caracterização do contínuo e estendendo a lei de Darcy para o caso multifásico, através da introdução do conceito de permeabilidades relativas dos fluidos, derivamos um sistema acoplado de equações diferenciais parciais com coeficientes variáveis e termos não lineares formulados em função da velocidade de Darcy para o escoamento bifásico (água, óleo) aquecido por ondas eletromagnéticas. O modelo matemático é discretizado utilizando o método de diferenças finitas no tempo e no espaço e a técnica Splitting. Dessa forma dividimos o sistema de equações diferencias parciais em dois subsistemas. O primeiro subsistema consiste em resolver a parte difusiva e reativa e o segundo subsistema tem por objetivo a resolução do termo convectivo. O método numérico desenvolvido é validado por simulações computacionais que visam a comparação com os resultados obtidos experimentalmente e com soluções semi-analíticas, para este problema, que foram derivadas pelo método do princípio de Duhamel. Além disso, o método proposto quando aplicado para o caso geral da simulação do escoamento bifásico com aquecimento eletromagnético demonstrou um ganho de 1.67%, se comparado ao método sem aquecimento.
In this work we are interested in studying, through computational simulations, if the electromagnetic heating is able to improve the displacement of the oil by water. In this direction, we rely on the results obtained by the TU Delft team from the Netherlands, which developed laboratory experiments that demonstrated the temperature distribution in a porous medium where the oil is being displaced by the injection of water generated by electromagnetic heating. For this, we define the mathematical model that governs the problem in question governed by partial differential equations of the laws of conservation of mass and energy. Thus, starting from the characterization of the continuum and extending Darcy’s law to the multiphase case, by introducing the concept of relative permeabilities of fluids, we derive a coupled system of partial differential equations with variable coefficients and non-linear terms formulated as a function of the velocity of Darcy for two-phase flow (water, oil) heated by electromagnetic waves. The mathematical model is discretized using the finite difference method in time and space and the Splitting technique. In this way we divide the system of partial differential equations into two subsystems. The first subsystem consists of solving the diffusive and reactive part and the second subsystem aims to solve the convective term. The numerical method developed is validated by computational simulations aimed at the comparison with the results obtained experimentally and with semi-analytical solutions, for this problem, which were derived by the Duhamel principle method. In addition, the proposed method when applied to the general case of simulation of the biphasic flow with electromagnetic heating demonstrated a gain of 1.67%, when compared to the non-heating method.
Black, Jennifer May. "Particle motion and heat transfer in rotary drums." Thesis, University of Edinburgh, 1988. http://hdl.handle.net/1842/11987.
Повний текст джерелаAbdul, Ghani S. A. A. "An investigation into water ingress through ground vehicle heating ventilation and air conditioning unit." Thesis, University of Nottingham, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.268509.
Повний текст джерелаSlapak, Rikard. "O⁺ heating in the high altitude cusp and mantle due to wave-particle interaction." Licentiate thesis, Luleå tekniska universitet, Rymdteknik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-26562.
Повний текст джерелаGodkänd; 2011; 20111007 (riksla); LICENTIATSEMINARIUM Ämnesområde: Rymdteknik/Space Engineering Examinator: Docent Hans Nilsson, IRF Kiruna Diskutant: Doktor Stephan Buchert, IRF Uppsala Tid: Fredag den 11 november 2011 kl 10.00 Plats: IRF, Kiruna
Kowsary, Farshad. "Radiative characteristics of spherical cavities having partially or completely specular walls." Diss., Virginia Polytechnic Institute and State University, 1989. http://hdl.handle.net/10919/54222.
Повний текст джерелаPh. D.
Lohe, Martin R., Kristina Gedrich, Thomas Freudenberg, Emanuel Kockrick, Til Dellmann, and Stefan Kaskel. "Heating and separation using nanomagnet-functionalized metal–organic frameworks." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-138610.
Повний текст джерелаDieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich
Deliyanakis, Nicholas. "A study of tokamak energy and particle transport, based on modulated electron cyclotron resonance heating." Thesis, University of Oxford, 1989. http://ora.ox.ac.uk/objects/uuid:b5426c92-b6ee-43fb-ad46-6fcb9ae9b4fe.
Повний текст джерелаPaz, Pavel Zenon Sejas. "Estudo analítico da injeção de água com aquecimento eletromagnético em um meio poroso contendo óleo." Universidade Federal de Juiz de Fora, 2015. https://repositorio.ufjf.br/jspui/handle/ufjf/405.
Повний текст джерелаApproved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2016-01-25T17:32:38Z (GMT) No. of bitstreams: 1 pavelzenonsejaspaz.pdf: 1021401 bytes, checksum: 6c80da770310ced9141a330e3a4d4f9b (MD5)
Made available in DSpace on 2016-01-25T17:32:38Z (GMT). No. of bitstreams: 1 pavelzenonsejaspaz.pdf: 1021401 bytes, checksum: 6c80da770310ced9141a330e3a4d4f9b (MD5) Previous issue date: 2015-08-28
CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Neste trabalho apresentamos um estudo analítico sobre a recuperação de óleo pesado utilizando injeção de água, que é aquecida por meio de ondas eletromagnéticas de alta freqüência. Recentemente, foi feito um experimento (descrito em [12]), onde a água foi injetada num meio poroso, aquecida por meio de ondas eletromagnéticas. Os resultados do experimento mostram que o aquecimento mediante ondas EM melhora o deslocamento do óleo pela água. Desta maneira, apresenta-se a injeção de água com aquecimento por ondas EM como um método viável na recuperação de óleo. Consideraremos um modelo matemático simples descrevendo o experimento mencionado acima, que consiste de duas leis de balanço, uma para a energia e outra para a massa da água. O objetivo do trabalho é usar o Princípio de Duhamel e a Teoria das Leis de Conservação para encontrar soluções semi-analíticas deste modelo simplificado. Segundo [8], utilizamos o Princípio para achar a solução da equação de balanço de energia do tipo Convecção-Reação-Difusão para o problema de transporte de calor num meio poroso na presença de uma fonte de ondas eletromagnéticas. A equação de balanço para a massa da água é uma equação diferencial parcial não linear de primeira ordem do tipo Buckley-Leverett (Veja [4] e [7]). Ela será resolvida usando a Teoria das Leis de Conservação. Segundo [15], a solução deste problema contém ondas de rarefação e choque.
In this work, we present the results obtained by analytical study of heavy oil recovery by water flooding and electromagnetic (EM) heating of high frequency. Recently, an experiment was made, where water was injected into a porous medium, warmed by means of electromagnetic waves. The experiment results show that EM heating improves the displacement of oil by water. Thus, the water flooding combined with EM heating is a viable method for oil recovery. We consider a simple mathematical model describing this experiment consisting of two balance laws for energy and water mass. The goal is to use Duhamel’s Principle and the Theory of Conservation Laws to find semi-analytical solutions of this simplified model. We use the principle solve the energy balance equation of convection-reaction-diffusion type for heat transport problem in a porous medium in the presence of a source of electromagnetic waves. The balance equation for the mass of water is a nonlinear partial differential equation of first order of Buckley-Leverett type. It is solved using the Theory of Conservation Laws.
Dieckmann, Mark Eric. "A survey of elementary plasma instabilities and ECH wave noise properties relevant to plasma sounding by means of particle in cell simulations." Thesis, University of Warwick, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.327557.
Повний текст джерелаLohe, Martin R., Kristina Gedrich, Thomas Freudenberg, Emanuel Kockrick, Til Dellmann, and Stefan Kaskel. "Heating and separation using nanomagnet-functionalized metal–organic frameworks." Royal Society of Chemistry, 2011. https://tud.qucosa.de/id/qucosa%3A27764.
Повний текст джерелаDieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich.
Knott, Ryan Christopher. "High temperature durability of metals for use in a particle heating receiver for concentrated solar power." Thesis, Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/53117.
Повний текст джерелаYamaguchi, Hiroyuki. "Simulation study of energetic particle physics in perturbed helical plasmas." 京都大学 (Kyoto University), 2016. http://hdl.handle.net/2433/215531.
Повний текст джерелаHannah, Iain G. "Particle heating and acceleration in solar flares : energisation at a reconnecting X-point and RHESSI microflare observations." Thesis, University of Glasgow, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.425320.
Повний текст джерелаYahya, Mahzoun. "Heating Value and Energy Recovery Potential of Sewage Sludge and Suspended Solids in Municipal Wastewater Treatment Plant." Kyoto University, 2018. http://hdl.handle.net/2433/232029.
Повний текст джерелаPrudek, Michal. "Relaxační centrum ve Velkém Meziříčí." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2016. http://www.nusl.cz/ntk/nusl-240299.
Повний текст джерелаGreen, Adam. "Structure and Dynamics of Two Flow Fields Used for Particle Deposition onto and Removal from a Substrate." ScholarWorks @ UVM, 2016. http://scholarworks.uvm.edu/graddis/554.
Повний текст джерелаBigongiari, Alessandra. "High Intensity Laser-Plasma Grating Interaction : surface wave excitation and particle acceleration." Palaiseau, Ecole polytechnique, 2012. http://pastel.archives-ouvertes.fr/docs/00/75/83/55/PDF/alebigo_TESI_rapporteurs.pdf.
Повний текст джерелаSurface waves in solids were first observed by Wood in 1902 as an anomaly in the diffraction of a continuous light source from a metal grating: the diffracted spectrum presented dark lines corresponding to certain wavelengths, which were later explained (Fano, 1941) in terms of the excitation of a surface wave sustained by the grating. Similarly to the metal grating case, a surface plasma wave (SPW) can be resonantly excited by a laser pulse at the surface of a laser-produced over-dense plasma, if the correct matching conditions are provided. SPWs propagate along the plasma-vacuum interface and are characterized by a localized, high frequency, resonant electric field. In the present work we describe numerically the dynamics of the plasma and the field distribution associated to SPW excitation, using two-dimensional particle-in-cell (PIC) simulations, where the plasma surface is initially pre-formed so that the SPW excitation conditions are fulfilled. We examine the surface wave excitation for a large range of laser intensities (Iλ2 =10^15-10^20 μm^2/Wcm^2) in order to study the transition from the non-relativistic to the relativistic regime. The simulations in which the wave is resonantly excited are compared to cases in which the resonant conditions are not provided and the coupling of the laser with the target is analyzed. We have considered the following aspects of the laser-plasma interaction, for different laser and target parameters: i) the laser absorption and the electric field at the surface ii) the generation of a quasi-static magnetic field iii) the electron heating and iiii) the ion acceleration. The possibility to excite a surface plasma wave on a structured target for a large range of laser energies has been demonstrated. In the cases where the surface wave is excited the electric field component normal to the target is amplified at the surface by a factor ranging from 3. 2 to 7. 2 with respect to the laser field. The absorption is also increased,for example it raises from 27% when the SPW is not excited up to 73% for Iλ^2=10^9 μm^2/Wcm^2. We have defined the optimal conditions for efficient coupling which increase laser absorption, that correspond to the relativistic laser intensities (Iλ^2>10^19 μm^2/Wcm^2). In this regime the main absorption mechanism is vacuum heating, associated to particles oscillating in the field perpendicular to the target, which is enhanced by the stronger, localized field of the SPW. The generation of a quasi-static magnetic field has been studied analytically and compared to the result of PIC simulations. The different field structure in presence of a SPW and for a flat target suggests that the enhanced field strength has caused partial confinement of particles at the target surface when SPW is present. The effects of the surface wave are more pronounced in thin laminar targets where electrons recirculate into the target interacting several times with the wave. Efficient electron heating increases the energy of the ions which are accelerated at both the irradiated and not irradiated target surface by the hot electrons space charge field. For the thinnest target (3. 5 μm) the ion cut-off energy is about 14 Mev, approximately twice the value obtained when the SPW is not excited
Palaniappan, Sevugan. "Ohmic heating of foods : studies on microbicidal effect of electricity, electrical conductivity of foods, and heat transfer in liquid- particle mixtures /." The Ohio State University, 1991. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487757723995203.
Повний текст джерелаMeige, Albert, and albert@meige net. "Numerical modeling of low-pressure plasmas: applications to electric double layers." The Australian National University. Research School of Physical Sciences and Engineering, 2006. http://thesis.anu.edu.au./public/adt-ANU20070111.002333.
Повний текст джерелаAlozie, Nehemiah Sabinus Iheadindueme. "Issues of particulate matter emission from diesel engine and its control." Thesis, Brunel University, 2016. http://bura.brunel.ac.uk/handle/2438/12822.
Повний текст джерелаRassou, Sébastien. "Accélération d'électrons par onde de sillage laser : Développement d’un modèle analytique étendu au cas d’un plasma magnétisé dans le régime du Blowout." Thesis, Université Paris-Saclay (ComUE), 2015. http://www.theses.fr/2015SACLS066/document.
Повний текст джерелаAn intense laser pulse propagating in an under dense plasma (ne< 10¹⁸ W.cm⁻²) and short(τ₀< 100 fs), the bubble regime is reached. Within the bubble the electric field can exceed 100 GV/m and a trapped electron beam is accelerated to GeV energy with few centimetres of plasma.In this regime, the electrons expelled by the laser ponderomotive force are brought back and form a dense sheath layer. First, an analytic model was derived using W. Lu and S. Yi formalisms in order to investigate the properties of the wakefield in the blowout regime. In a second part, the trapping and injection mechanisms into the wakefield were studied. When the optical injection scheme is used, electrons may undergo stochastic heating or cold injection depending on the lasers’ polarisations. A similarity parameter was introduced to find out the most appropriate method to maximise the trapped charge. In a third part, our analytic model is extended to investigate the influence of an initially applied longitudinal magnetic field on the laser wakefield in the bubble regime. When the plasma is magnetized two remarkable phenomena occur. Firstly the bubble is opened at its rear, and secondly the longitudinal magnetic field is amplified - at the rear of the bubble - due to the azimuthal current induced by the variation of the magnetic flux. The predictions of our analytic model were shown to be in agreement with 3D PIC simulation results obtained with Calder-Circ. In most situations the wake shape is altered and self-injection can be reduced or even cancelled by the applied magnetic field. However, the application of a longitudinal magnetic field, combined with a careful choice of laser-plasma parameters, reduces the energy spread of the electron beam produced after optical injection
Nakashima, Gabriela Tami. "Use of sugarcane trash for solid biofuel production: physicochemical characterization and influence of storage time." Universidade Federal de São Carlos, 2016. https://repositorio.ufscar.br/handle/ufscar/8955.
Повний текст джерелаApproved for entry into archive by Milena Rubi (milenarubi@ufscar.br) on 2017-08-09T12:48:12Z (GMT) No. of bitstreams: 1 NAKASHIMA_Gabriela_2016.pdf: 18948386 bytes, checksum: c4adf2165784091a5371108a8c2bd529 (MD5)
Approved for entry into archive by Milena Rubi (milenarubi@ufscar.br) on 2017-08-09T12:48:18Z (GMT) No. of bitstreams: 1 NAKASHIMA_Gabriela_2016.pdf: 18948386 bytes, checksum: c4adf2165784091a5371108a8c2bd529 (MD5)
Made available in DSpace on 2017-08-09T12:48:26Z (GMT). No. of bitstreams: 1 NAKASHIMA_Gabriela_2016.pdf: 18948386 bytes, checksum: c4adf2165784091a5371108a8c2bd529 (MD5) Previous issue date: 2016-04-29
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
In the sugarcane plantation it was common to use fire to facilitate the cutting and harvesting of sugarcane. However, Law 11,241 / 02 in São Paulo State provides the gradual elimination of this straw burning of sugarcane. The largest producer of sugarcane in Brazil is the São Paulo State, which has about 4.7 million hectares of planted area. It is estimated that one hectare produces about 14 tons of trash. Therefore, the mills have been trying to incorporate this trash in burning with the bagasse for power generation. However, high concentrations of mineral impurities are impossible its use for energy purposes. The aim of the study was to investigate the influence of storage time and particle size in the physicochemical characterization of the sugarcane trash. It was used the sugarcane trash inside and outside of the bale collected at different storage time (0, 1 and 2 years). The collected material was separated into four different particle sizes (> 0.420mm, 0.250-0.420mm, < 0.250mm and mix). The analyzes involved particle size distribution, proximate analysis, the high heating value (HHV), the chemical analysis of the components of the ashes, the images in the Scanning Electron Microscope (SEM), the Klason lignin content, the holocellulose content and extractives. There were variations in the results of the ash content with different particle sizes. It was observed a higher concentration of mineral impurities in smaller particles (< 0.250mm). The HHV varied from 15.9 to 18.3 MJ.kg-1 and showed no statistical difference for the treatments. The results indicate that the sugarcane trash presents problems related to mineral impurities which constrain its use as a solid fuel in the industry. The particle size interferes in their physicochemical characteristics. The trash can be stored in field and the time storage did not affect the quality for use as solid biofuel.
No manejo da cana-de-açúcar era comum a utilização do fogo para facilitar o corte e colheita da cana. No entanto, a Lei 11.241/02 do estado de São Paulo prevê a eliminação gradual da queima da palha da cana-de-açúcar. O maior produtor de cana-de-açúcar do Brasil é o estado de São Paulo, que possui aproximadamente 4,7 milhões de hectares de área plantada. É estimado que 1 hectare produza cerca de 14 toneladas de palha. Logo, as usinas vêm tentando incorporar esta palha na queima para geração de energia, juntamente com o bagaço. Porém, as altas concentrações de impurezas minerais estão impossibilitando seu uso para fins energéticos. O trabalho teve como objetivo o estudo da influência do tempo de estocagem e da granulometria na caracterização físico-química do palhiço da cana-de-açúcar. Foi utilizado o palhiço de canade-açúcar da superfície e do interior do fardo coletados em diferentes períodos de estocagem, 0, 1 e 2 anos. O material coletado foi separado em 4 granulometrias diferentes (> 0,420mm, 0,250-0,420mm, < 0,250mm e mix). As análises realizadas foram a distribuição granulométrica, a análise imediata, o poder calorífico superior (PCS), a análise química dos componentes das cinzas, as imagens no Microscópio Eletrônico de Varredura (MEV), o teor de lignina Klason, a holocelulose e os extrativos. Houve variações nos resultados do teor de cinzas com as diferentes granulometrias. Observou-se maior concentração de impurezas minerais nas partículas mais finas (< 0,250mm). O PCS variou entre 15,9 a 18,3 MJ.kg-1 e não apresentou diferença estatística para os tratamentos. Os resultados indicam que a palha de cana-de-açúcar apresenta problemas relacionados às impurezas minerais, que dificultam e restringem seu uso como combustível sólido na indústria. A granulometria da palha interferiu nas suas características físico-químicas. O palhiço pode ser estocado no campo e o tempo de estocagem não interferiu na qualidade para o uso como combustível sólido.
Boivie, Klas. "On the Manufacturing of SFF Based Tooling and Development of SLS Steel Material." Doctoral thesis, KTH, Production Engineering, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3814.
Повний текст джерелаAdler, Jeanette. "Film Formation and Surface Tension Studies of Powder Coatings." Thesis, KTH, Fibre and Polymer Technology, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3935.
Повний текст джерелаIn industrial use of paint systems a swift processing is crucial. Another very important issue is to improve the quality of the final coating. This report investigates the film formation process of powder coatings, specially the spreading of individual powder particles. The obtained results can be used to understand and control the film formation process. In this way the desired levelling can be achieved and thus the desired gloss or other surface characteristics that may be required. This means that the method could be used when evaluating different polymer and additive combinations that could be used to change film formation behaviour or curing time for powder coating systems to suit various substrates. It makes it possible to avoid and minimize different surface defects as orange peel or cratering in the powder coated film.
We used a reflection optical microscope to better understand the film formation process and especially the spreading of a powder melt on surfaces with various surface energies. The obtained data were: the particle diameter, the area, area ratio and the contact angle of the powder particle as a function of time and temperature. This information can be used to derive the surface tension of any powder melt.
In this report we evaluate the dependencies of temperature, heat rate and surface energy for powder coatings on different substrates. The method provides information that can be used to optimize the film formation of a specific powder coating/substrate combination. This method can be used to evaluate the powder spreading and levelling on different substrates from a surface tension point of view.
We found, as expected, that the powder flows out on a hydrophilic surface and is inhibited by a hydrophobic. The increase of the area ratio on a hydrophilic surface was about five times as the initial area coverage and on a hydrophobic surface only two times the initial area coverage. The contact angle between the melted powder particle on the different surface types could be calculated. The melt surface tension could be calculated since three substrates surfaces with various surface energies were used. The melt surface tension was found to be about 18.5 mN/m.
Sammanfattning
Vid industriell användning av ett färgsystem är det viktigt med en snabb och smidig målningsprocess. En viktig del är att förbättra kvaliteten på den färdiga ytan. Denna rapport undersöker filmbildningsprocessen för pulverfärg, närmare bestämt spridningen av individuella pulverpartiklar. Resultaten från utvärderingen av denna metod kan användas för att bättre förstå och få kontroll över filmbildningsprocessen. Med denna undersökningsmetod kan den önskade utslätningen uppnås och därmed den önskade glansen eller annan yteffekt som kan vara önskvärd.
Metoden kan användas för att utvärdera olika polymer- och additivkombinationer som kan användas för att ändra filmbildningens uppförande eller bestämma härdningstiden för en pulverfärg att passa ett visst substrat. Metoden gör det möjligt att förhindra och minska olika ytdefekter såsom apelsinskals- eller kratereffekter i pulverfärgens yta.
Ett optiskt reflectionsmikroskop användes för att bättre kunna förstå filmbildningsprocessen och särskilt spridningen av smält pulver på substrat med olika ytenergier. De mätdata vi fick var partikeldiameter, area, areaförändring och kontaktvinkeln för pulverpartiklar som funktion av tid och temperatur. Ur denna information kunde pulversmältans ytenergier härledas.
I denna rapport utvärderas pulvrets beroende av temperatur, uppvärmning och ytenergi på olika substrat. Denna metod ger information som kan användas för att optimera filmbildningen av en specifik kombination av pulverfärg och substrat. Denna metod kan också användas för att utvärdera pulverspridning och utjämning av färgfilmen på olika substrat med avseende på ytenergierna.
Som förväntat flyter pulvret ut på hydrofila ytor och utflytningen ändras på en hydrofob yta. På en hydrofil yta sprider sig partikeln till fem gånger den ursprungliga arean över substratet och motsvarande två gånger för en hydrofob yta. Kontaktvinkeln mellan en smält pulverpartikel på olika sorters substrat från utförda mätningar beräknas utifrån utförda mätningar. Kontaktvinklar mellan pulver och olika substrat kan användas för att beräkna smältans ytspänning. Smältans ytspänning kan beräknas då experiment gjorts på tre sorters ytor med olika kända ytenergier. Smältans ytspänning var 18,5 mN/m.
Slutsatsen är att det går att observera och utvärdera resultaten av utsmältningsförloppet för pulverfärg med denna metod.
Carrié, Michaël. "Accélération de protons par laser à ultra-haute intensité : étude et application au chauffage isochore." Phd thesis, Université Paris Sud - Paris XI, 2011. http://tel.archives-ouvertes.fr/tel-00608050.
Повний текст джерелаLi, Rui. "Solar pyrolysis of agricultural, forest and metal-contaminated biomass." Thesis, Perpignan, 2020. http://www.theses.fr/2020PERP0026.
Повний текст джерелаBiomass, as a renewable energy source, can contribute to relieving the energy crisis and environmental pollutions. Pyrolysis is an attractive thermochemical process to convert biomass into biofuels. Solar energy processes improve the heat and mass balance of the biomass pyrolysis to produce transportable fuels, chemicals, and biomaterials. In the present study, solar pyrolysis of agricultural and forestry by-product biomass and metal-polluted wood has been examined. Pine sawdust, peach pit, grape stalk, and grape marc, were used as the raw materials as the agricultural and forestry by-products in a series of solar pyrolysis experiments in a lab-scale reactor. We studied the impacts of operating conditions (i.e., temperature from 800 to 2000°C, heating rate from 10 to 150°C/s, and lignocellulose composition) on the product yields (i.e., gas, tar, and char) and syngas composition. The gas yield of different biomass residues generally increases with the temperature and heating rate, while the liquid yield shows an opposite trend. Lignin, hemicellulose, and cellulose contents, as well as pellet size, of the by-products studied have an impact on the product profile under fast solar pyrolysis. Lignin content is associated with greater char and tar yields, but less gas yields. Hemicellulose pyrolysis produces more volatiles, but less char and tar yields than cellulose pyrolysis.Solar pyrolysis of chicken-litter waste and rice husk of different particle sizes (280 and 500 µm) was performed at different solar conditions aiming at investigating optimal operating parameters, such as temperature, particle size, and heating rate, to produce pyrolysis gasses with high calorific value. Temperature was found to have the highest effect on the gas yield during pyrolysis. Gases produced from solar assisted biomass pyrolysis have high concentration of combustible products which can be directly used as fuels.Biomass can be contaminated by heavy metals. Experiments were carried out to study the effects of heavy metals (copper and nickel), in combination with heating temperature and heating rate, on solar pyrolysis products of impregnated willow. Results of the investigation indicate that solar pyrolysis of heavy metal contaminated biomass is promising to produce valuable syngas such as hydrogen and carbon monoxide. Additionally, the effects of these heavy metals on the chemical composition, structure, and morphology of pyrolysis char from the impregnated willow were studied. Results prove that heavy metal and solar pyrolysis temperature affect the char properties. A conduction model was developed to describe the behavior of temperature inside the pellets. A kinetic scheme from literature involving the primary and the secondary reactions is adopted to carry out the simulations of temperature. A finite difference method was used for solving the heat transfer equation with an explicit scheme. The model is solved for two dimensions (i.e., time and axial position) in order to make it simpler and save computational time
Jheng, Jia-Siang, and 鄭佳祥. "Application of Induction Heating to Partial Hardening of Workpiece." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/14992422127164220299.
Повний текст джерела國立臺灣大學
機械工程學研究所
92
Abstract The characteristics of high frequency induction heating were that it could heat the surface of metal workpiece at a specific part quickly. The time of heating was so short that the oxidation and decarburization were negligible. This article used these features of high frequency induction heating to strengthen the metal workpiece. This experiment includes two parts: 1. To harden the tip of the sewing needle, which was manufactured from SK4 carbon tool steel. In order to make the sewing needle possessing toughness and partial high hardness, double quenching was performed in this experiment and the parameters affecting the hardness distribution and microstructure of the needles were discussed. The parameters were that whether using partial quenching or not and the different time holding in quenching temperature. 2. Workpiece could be heated quickly and reach to high temperature by high frequency induction heating. To make use of these characteristics, low-carbon steel was carburized in a short time at high temperature. Carburizing time and temperature are variables of this experiment. The parameters affecting the hardness distribution, microstructure, and carburization depth were discussed. The major results are shown as follows: 1. It would indeed get the result of tough needle and hard pinpoint when the sewing needle was hardened locally by high frequency induction heating in advance, because more Fe3C of the pinpoint would be dissolved into the matrix. 2. When low-carbon steel was heated by high frequency induction heating and carburized at high temperature for seconds, the speed of carburization was very fast. In addition, the effect of surface hardening was very good after quenching. Compared with the traditional method, this new method saves more time than the old one. 3. When high frequency induction heating was used in gas carburization, the Ledeburite would be developed in the surface if the carburizing temperature is above the eutectic point of cast iron. It may be useful in the surface modification of steel because of high hardness, good wear resistance and corrosion resistance.
Li, Bo-Yi, and 李柏毅. "Particle Swarm Optimization of Fuzzy Temperature Control for Smart Electric Heating Clothing." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/44r6k3.
Повний текст джерела國立臺灣海洋大學
系統工程暨造船學系
102
Following the medical and science technology are developed rapidly and human society is become an aging population society gradually, life cares for elderly are respected by people. The most important life care is to against cold and to keep warm efficiently in winter. In consideration of above reasons, this paper presents to develop a smart electric heating clothing (SEHC) with a constant temperature control function by adopted a programmable system on chip (PSoC). However, conventional electric heating clothing in commercial markets has drawbacks of longer rising time, larger energy consumption, and shorter operational time. Therefore, there are three different temperature controllers, i.e. bang-bang temperature controller (BBTC), fuzzy temperature controller (FTC), and particle swarm optimization (PSO) based FTC, were adopted in this study to enhance the system performance and decrease energy consumption in the designed SEHC. The proposed PSO-based FTC was adjusted weighting factors of the conventional FTC by a PSO to optimize and decrease the electric power of the integrated system. In the experimental results, the rising time of 123.2 s, 127.7 s, and 135.0 s are by adoption of the BBTC, the FTC, and the PSO-based FTC, respectively; the energy consumption by utilizing the FTC and the PSO-based FTC could be reduced 2.4% and 18.6% related to the BBTC effectively. Hence, it could extend the operational time by using PSO-based FTC in the designed SEHC.
Chen, Xiang-Shu, and 陳湘書. "Optimal Control Strategy of Heat Pump Water Heating System Using Particle Swarm Optimization." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/th5vx8.
Повний текст джерела國立臺北科技大學
能源與冷凍空調工程系碩士班
98
The heat pump system coordination boiler provides the hot water is one which of heating patterns present uses for the hospital and the hotel, however in the actual operation, as a result of the hot water demand''s change, in the running operation, often has some problem, such as the peak price period, when the water load demand for the client at a time when storage tank up into the cold water so the water temperature is low, causing the boiler to increase energy use; At this point, if the load demand to be high-end supplemented using the heat pump heat into cold water, will help to reduce energy use. Before the end of the load in the water up into the cold water to stop the use of off-peak electricity price periods supplemented into the cold water and heating using heat pumps, so that the energy consumption during peak electricity transferred to off-peak price period, the economy will help to reduce spending. Therefore, how different time points in the heat pump and pump control, forming optimal operation problem, which is the focus of this study is to investigate. In this actual case, using the particle swarm optimization, set the life-cycle cost as the objective function, heat pump、water pump start and stop status of the state variables, with known client load of water, storage tank, heating system components, the peak and off-peak electricity price periods, through the numerical simulation program for the system to find heat pump、water pump start and stop each time the state of the lowest life-cycle cost control operating mode, and with only heat pump start and stop optimization of control operation mode and the current operating mode of the two control (water temperature control, water level control) for life-cycle costs, energy costs and energy consumption comparison of the system to seek out the best control strategy to improve the economic efficiency of heat pump water heating system and achieve the government to promote energy conservation and carbon reduction targets, as domestic manufacturers to develop and conduct heat pump systems engineering reference to follow. Indoor swimming-pool is usually conducted through a suitable introduction of fresh air to maintain indoor design condition. Since water is evaporated from the pool surface, the exhausted air contains more water and specific enthalpy. In response to this indoor air, heat pump is generally used in heat recovery for indoor swimming pools. This paper utilizes particle swarm algorithm to optimize heat pump system
Chang, Chun-Hao, and 張峻豪. "Optimal Control Strategy of Solar Heat Pump Water Heating System Using Particle Swarm Optimization." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/y6c338.
Повний текст джерела國立臺北科技大學
冷凍空調工程系所
100
Auxiliary heating source for solar water heating systems is commonly using in boilers. Heat pump''s energy efficiency is much higher than electrical heating. Heat pump’s instant heating ability is weaker than boiler. Therefore, when we want to replace the boiler into solar heat pump water heating system, we need to design the equipment capacity and find operating model to optimize the system efficiency? How to set the initial temperature on the tank? The smaller initial temperature on the tank is will result in the higher efficiency in the solar collectors and heat pump, but when the initial temperature is too low will cause the temperature cannot reach the demand temperature. The simulation results show that in all day load. The solar heat pump water heating system can save about 4.5% of the life cycle cost than using the solar boiler water heating system. The solar heat pump water heating system can save about 6.7% of the life cycle cost than using the heat pump water heating system. When only consider the system load at night. The solar heat pump water heating system can save about 15.1% of the life cycle cost than using the solar boiler water heating system. The solar heat pump water heating system can save about 17.4% of the life cycle cost than using the heat pump water heating system. The solar heat pump water heating system operation at night can save about 17.4% of the life cycle cost than at all day use. Applying the Particle Swarm Optimization in the solar heat pump water heating system can find the optimized operating mode and the best equipment capacity. Heat pump and water pump optimum control mode can transfer the electricity from peak electric price to off-peak electric price. The optimum heat pump capacity and the solar collector pieces can avoid excessive construction costs, not only to achieve the goal of the energy saving, but also economic benefits are very significant.
Chen, Li-Kai, and 陳立凱. "A model for heating of liquid -particle mixtures in a continuous flow ohmic heater." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/17111941772119054068.
Повний текст джерела國立臺灣大學
生物產業機電工程學研究所
90
ABSTACT In ohmic heating, the temperature of liquid -particle mixtures affects the quality of food. Understanding the temperature history of mixtures in process would be helpful to apply ohmic heating. In this search, we use exact solution incorporated with numerical analysis to build a model for heating of liquid-particle mixtures in a continuous flow ohmic heater and to compute the temperature history with solid and liquid phases. Simulations show that the temperature of mixtures with higher electrical conductivity particulates rises faster than that with lower electrical conductivity particulates. With the increase of solid contents in the mixtures, a particle’s electrical resistance within a circuit will be a significant component of the overall resistance. The solid will likely heat faster than the liquid. High solid content mixtures in Ohmic heating will promote more uniform temperature distribution inside the particle and might be promising. Keywords: ohmic heating, mathematic model, liquid-particle mixtures.
Kung, Chung-Kuan, and 龔仲寬. "Optimization of Heat Pump Heating System in Indoor Swimming Pool Using Particle Swarm Algorithm." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/5y96bg.
Повний текст джерела國立臺北科技大學
能源與冷凍空調工程系碩士班
95
Indoor swimming-pool is usually conducted through a suitable introduction of fresh air to maintain indoor design condition. Since water is evaporated from the pool surface, the exhausted air contains more water and specific enthalpy. In response to this indoor air, heat pump is generally used in heat recovery for indoor swimming pools. This paper utilizes particle swarm algorithm to optimize heat pump system. The optimized parameters include continue parameters: outdoor air mass flow, and heat conductance of heat exchanger; and discrete parameters: compressor type and boiler type. In a case study, life cycle energy cost is considered as an objective function, and optimal introduced mass flow of outdoor air and optimal design for heating system are found by using Particle Swarm algorithm. From the convergence of solution progress and the consistency for finding the best solution, we conclude that the Particle Swarm algorism is effective method for optimizing the heating system of indoor swimming pool.
Thanapal, Siva Sankar. "Gasification of Low Ash Partially Composted Dairy Biomass with Enriched Air Mixture." Thesis, 2010. http://hdl.handle.net/1969.1/ETD-TAMU-2010-12-8927.
Повний текст джерелаPattani, Varun Paresh. "Nanoparticle-mediated photothermal therapy of tumors : a comparative study of heating efficiencies for different particle types." Thesis, 2010. http://hdl.handle.net/2152/ETD-UT-2010-05-1482.
Повний текст джерелаtext
(9643427), Troy A. Seberson. "Heating and Cooling Mechanisms for the Thermal Motion of an Optically Levitated Nanoparticle." Thesis, 2020.
Знайти повний текст джерелаBridging the gap between the classical and quantum regimes has consequences not only for fundamental tests of quantum theory, but for the relation between quantum mechanics and gravity. The field of levito-dynamics provides a promising platform for testing the hypotheses of the works investigating these ideas. By manipulating a macroscopic particle's motion to the scale of its ground state wavefunction, levito-dynamics offers insight into the macroscopic-quantum regime.
Ardent and promising research has brought the field of levito-dynamics to a state in which these tests are available. Recent work has brought a mesoscopic particle's motion to near the ground state. Several factors of decoherence are limiting efficient testing of these fundamental theories which implies the need for alternative strategies for achieving the same goal. This thesis is concerned with investigating alternative methods that may enable a mesoscopic particle to reach the quantum regime.
In this thesis, three theoretical proposals are studied as a means for a mesoscopic particle to reach the quantum regime as well as a detailed study into one of the most important factors of heating and decoherence for optical trapping. The first study of cooling a particle's motion highlights that the rotational degrees of freedom of a levitated symmetric-top particle leads to large harmonic frequencies compared to the translational motion, offering a more accessible ground state temperature after feedback cooling is applied. An analysis of a recent experiment under similar conditions is compared with the theoretical findings and found to be consistent.The second method of cooling takes advantage of the decades long knowledge of atom trapping and cooling. By coupling a spin-polarized, continuously Doppler cooled atomic gas to a magnetic nanoparticle through the dipole-dipole interaction, motional energy is able to be removed from the nanoparticle. Through this method, the particle is able to reach near its quantum ground state provided the atoms are at a temperature below the nanoparticle ground state temperature and the atom number is sufficiently large.The final investigation presents the dynamics of an optically levitated dielectric disk in a Gaussian standing wave. Though few studies have been performed on disks both theoretically and experimentally, our findings show that the stable couplings between the translational and rotational degrees of freedom offer a possibility for cooling several degrees of freedom simultaneously by actively cooling a single degree freedom.
McCurrin, Casey. "Flow and Temperature Fields Generated by a Thermally Activated Interventional Vascular Device." Thesis, 2012. http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11620.
Повний текст джерелаLewis, Elliott William. "Development and Application of a Method for Gas-phase Temperature Measurements in Particle-laden Flows." Thesis, 2022. https://hdl.handle.net/2440/136045.
Повний текст джерелаThesis (Ph.D.) -- University of Adelaide, School of Mechanical Engineering, 2022
Meige, Albert. "Numerical modeling of low-pressure plasmas: applications to electric double layers." Phd thesis, 2006. http://hdl.handle.net/1885/45749.
Повний текст джерелаCox, Sebastian Penleigh. "The impact of fishbones on neutron rate in beam-heated plasmas in MAST." Master's thesis, 2015. http://hdl.handle.net/1885/112493.
Повний текст джерела