Teses / dissertações sobre o tema "Enhanced emission"
Crie uma referência precisa em APA, MLA, Chicago, Harvard, e outros estilos
Veja os 50 melhores trabalhos (teses / dissertações) para estudos sobre o assunto "Enhanced emission".
Ao lado de cada fonte na lista de referências, há um botão "Adicionar à bibliografia". Clique e geraremos automaticamente a citação bibliográfica do trabalho escolhido no estilo de citação de que você precisa: APA, MLA, Harvard, Chicago, Vancouver, etc.
Você também pode baixar o texto completo da publicação científica em formato .pdf e ler o resumo do trabalho online se estiver presente nos metadados.
Veja as teses / dissertações das mais diversas áreas científicas e compile uma bibliografia correta.
Liu, Tsung-li. "Plasmonic Cavities for Enhanced Spotaneous Emission". Thesis, Harvard University, 2013. http://dissertations.umi.com/gsas.harvard:10868.
Texto completo da fonteEngineering and Applied Sciences
Day, Christopher M. "Field enhanced thermionic emission from oxide coated carbon nanotubes". Virtual Press, 2006. http://liblink.bsu.edu/uhtbin/catkey/1348860.
Texto completo da fonteDepartment of Physics and Astronomy
Graham, Luke Alan. "Observation of enhanced spontaneous emission in dielectrically apertured microcavities /". Digital version accessible at:, 1999. http://wwwlib.umi.com/cr/utexas/main.
Texto completo da fonteWang, Tong. "Enhanced Field Emission Studies on Nioboim Surfaces Relevant to High Field Superconducting Radio-Frequency Devices". Diss., Virginia Tech, 2002. http://hdl.handle.net/10919/29284.
Texto completo da fontePh. D.
Dimaria, Jeffrey V. "Plasmonic control of light emission for enhanced efficiency and beam shaping". Thesis, Boston University, 2014. https://hdl.handle.net/2144/10981.
Texto completo da fonteInGaN alloys and related quantum structures are of great technological importance for the development of visible light emitting devices, motivated by a wide range of applications, particularly solid-state lighting. The InxGa1-xN material system provides continuous emission tuning from the ultraviolet across the visible spectrum by changing the In content. InGaN/GaN quantum wells (QW) also provide an efficient medium for electroluminescence for use as light emitting diodes. It is well known, however, that increasing the In content degrades the internal quantum efficiency of these devices, particularly in the green region of the spectrum. These limitations must be overcome before efficient all-solid-state lighting can be developed beyond the blue-green region using this material system. Recently, the application of plasmonic excitations supported by metallic nanostructures has emerged as a promising approach to address this issue. In this work, metallic nanoparticles (NPs) and nanostructures that support plasmonic modes are engineered to increase the local density of states of the electromagnetic field that overlaps the QW region. This leads to an enhancement of the spontaneous emission rate of the QW region mediated by direct coupling into the plasmonic modes of the nanostructure. Energy stored in these modes can then scatter efficiently into free-space radiation, thereby enhancing the light output intensity. The first section of this thesis concerns the enhancement of InGaN/GaN QW light emission by utilizing localized surface plasmon resonances (LSPRs) and lattice surface modes of metal NP arrays. This work comprises a detailed study of the effect of geometry variations of Ag NPs on the LSPR wavelength, and the subsequent demonstration of photoluminescence intensity enhancement by Ag NPs in the vicinity of InGaN multiple QWs. The second section of this thesis concerns the far-field control of QW emission utilizing metallic nanostructures that support plasmonic excitations. This includes a study of the dispersion and competing effects of a metallic NP-film system, and the demonstration of beam collimation and unidirectional diffraction utilizing a similar geometry. These results may find novel applications in the emerging field of solid-state smart lighting.
Unitt, David Christopher. "Enhanced single photon emission from a quantum dot in a semiconductor microcavity". Thesis, University of Cambridge, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.613784.
Texto completo da fonteBagge-Hansen, Michael. "Enhanced Field Emission from Vertically Oriented Graphene by Thin Solid Film Coatings". W&M ScholarWorks, 2011. https://scholarworks.wm.edu/etd/1539623349.
Texto completo da fonteGill, Simaranjit Singh. "Controlling diesel NO_x & PM emissions using fuel components and enhanced aftertreatment techniques : developing the next generation emission control system". Thesis, University of Birmingham, 2012. http://etheses.bham.ac.uk//id/eprint/3643/.
Texto completo da fonteNur, Salahuddin. "Towards enhanced radiative emission for optical read-out of donor spins in silicon". Thesis, University College London (University of London), 2018. http://discovery.ucl.ac.uk/10055928/.
Texto completo da fonteLiu, Quan. "Enhanced Emission of a Single Quantum Emitter Coupled to a Microcavity and a Nanocavity". Thesis, Troyes, 2021. http://www.theses.fr/2021TROY0029.
Texto completo da fonteThe development of single molecule-based techniques in the last decades has enabled directly selecting, tracking, and measuring an individual molecule. In this thesis, the structural dynamics of a single quantum emitter, served by hypericin, is characterized. By using confocal scanning microscopy combined with radially/azimuthally polarized laser modes, three-dimensional reorientation of the transition dipole moment of a single molecule is observed. To quantify the temporal properties of the tautomerism, photon autocorrelation function is used to extract the intensity fluctuations. The results show the distinct influence of the local environment, such as PVA matrix and deuteration effect. The local photonic environment of a molecule is modified by the microcavity/nanocavity. A significant change of the radiative emission rate and of the fluorescence spectra is discussed. It allows us to measure the absolute quantum yield by using a tunable microcavity. The results show the possibility of controlling tautomerization by changing the photonic environment. Subsequently, molecular dissociation is discussed by single molecule surface-enhanced Raman spectra profiting from near field enhancement of nanocavity. A fast experimental optimization strategy towards optimal fluorescence enhancement is outlined
Pliutau, Dzianis V. "LIBS and LITE Emission Based Laser Remote Sensing of Chemical Species and Enhanced Modeling of Atmospheric Absorption". Scholar Commons, 2010. http://scholarcommons.usf.edu/etd/3531.
Texto completo da fonteNeupane, Suman. "Synthesis and Electron Emission Properties of Aligned Carbon Nanotube Arrays". FIU Digital Commons, 2014. http://digitalcommons.fiu.edu/etd/1168.
Texto completo da fonteOrozco, Nieto Pedro Francisco. "Manufacturing strategy for high current cold field emission cathodes : floating catalyst chemical vapour deposition grown carbon nanotube fibres and films enhanced by laser patterning and laser purification process". Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/278104.
Texto completo da fontePicardi, Gennaro. "Raman spectroscopy and light emission at metal surfaces enhanced by the optical near field of a scanning tunneling tip". [S.l. : s.n.], 2003. http://www.diss.fu-berlin.de/2003/191/index.html.
Texto completo da fonteRen, Zhengen. "Enhanced modelling of indoor air flows, temperatures, pollutant emission and dispersion by nesting sub-zones within a multizone model". Thesis, Queen's University Belfast, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.269182.
Texto completo da fonteTai, Chia-Hui. "Trace Elemental Analysis of Ashes in the Combustion of the Binder Enhanced d-RDF by Inductively Coupled Plasma Atomic Emission Spectroscopy". Thesis, University of North Texas, 1988. https://digital.library.unt.edu/ark:/67531/metadc501168/.
Texto completo da fonteMerritt, Travis Robert. "Optoperforation of Intact Plant Cells, Spectral Characterization of Alloy Disorder in InAsP Alloy Disorder in InAsP Alloys, and Bimetallic Concentric Surfaces for Metal-Enhanced Fluorescence in Upconverting Nanocrystals". Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/25148.
Texto completo da fontePh. D.
Masuda, Daisuke. "Enhanced external counterpulsation improved myocardial perfusion and coronary flow reserve in patients with chronic stable angina : Evaluation by 13N-ammonia positoron emission tomography". Kyoto University, 2001. http://hdl.handle.net/2433/150573.
Texto completo da fonteHudák, Igor. "Charakteristické parametry procesu spalování při využití vzduchu s obsahem kyslíku vyšším než 21 %". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230473.
Texto completo da fonteHedman, Karolina. "Differences in tumor volume for treated glioblastoma patients examined with 18F-fluorothymidine PET and contrast-enhanced MRI". Thesis, Umeå universitet, Institutionen för fysik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-173693.
Texto completo da fonteGarcia, Wagner de Oliveira [Verfasser]. "Assessment of enhanced silicate rock weathering feasibility as a soil ameliorant and its influence on other terrestrial negative emission technologies : Bewertung der Machbarkeit einer verbesserten Verwitterung von Silikatgesteinen als Bodenverbesserungsmittel und seines Einflusses auf andere terrestrische Technologien für negative Emissionen / Wagner de Oliveira Garcia". Hamburg : Staats- und Universitätsbibliothek Hamburg Carl von Ossietzky, 2020. http://d-nb.info/1221276433/34.
Texto completo da fonteBALDONI, NORA. "Innovations to enhance ecosystem services in mediterranean forage-cereal system". Doctoral thesis, Università Politecnica delle Marche, 2021. http://hdl.handle.net/11566/290869.
Texto completo da fonteIn rainfed areas of Central Italy a conventional crop rotation includes a long-lasting meadow interrupted by 2-3 years of cereal crops. The decision when to interrupt the meadow and to start the cereal cropping influences the ecosystem services (ES) that are provided by this forage-crop system. The present research wanted to investigate which practices can be adopted to manage this transition from a point of view of climate change mitigation and other ES. Three field experiments were carried out with this scope: The 1st experiment wanted to evaluate whether alfalfa meadow interruption in Mediterranean climate is convenient compared to its prolongation over the 6th year in terms of ES. I wanted to find out if its ES benefits can be replaced by the addition of a high rate of biochar addition before the growing of 2 successive wheat crops. Twelve ES services were examined. Alfalfa prolongation appeared to be the best choice to provide the highest number of ES. Biochar addition after alfalfa interruption didn’t show any significant increase of the ES, nor on plant biodiversity, which always resulted higher in alfalfa crop. The 2nd experiment compared N2O soil emission at the end of alfalfa by tillage followed by wheat growing with the continuation of a long-term alfalfa. The results indicated that tillage provoked a greater N2O emission (0.37 g N-N2O ha-1h-1) than that from undisturbed alfalfa (0.14 g N-N2O ha-1h-1). But this greater emission didn’t last long; after one year the emissions of the 2 options were similar. In conclusion, to reduce the GHGs emission linked to alfalfa termination it is recommended to delay the tillage under of alfalfa vegetation in the autumn, soon before wheat sowing. The 3rd experiment was carried out to determine if biochar addition can reduce the detrimental effects of alfalfa termination linked both to GHG emission and to pedological properties. For this scope I studied how a high rate of biochar (60 Mg ha-1) influences the soil characteristics and the behavior of 12 soil enzymes linked to the main element cycles in the soil. The comparison was made in the 2 wheat crops which were grown subsequently after alfalfa interruption. The results showed a slight tendency of biochar to promote soil aggregate stability and an increase of soil organic matter. Biochar incorporation, in the short term, had no effect on soil pH, Total N, available P and wheat yields. Biochar didn’t influence the enzymes, perhaps because of its alkalinity. Conversely tillage for wheat sowing and biochar incorporation resulted in an increased enzyme activity, mainly of those linked to carbon cycle. As a conclusion, the results confirm the beneficial effects of rainfed alfalfa meadow, which appeared the best crop even if it is kept for more than 6 years. The forage production might decrease, but the ES that it provides, are always higher than those of a cereal-based system. To terminate alfalfa (because of a drastic yield reduction of forage quantity), it’s better to delay the ploughing for wheat late in the season, to reduce the N2O emission. Biochar addition might replace some of the benefits of alfalfa, but this research, didn’t reveal any significant effect of biochar on the enzyme dynamic, probably because it was a woody, alkaline, high temperature biochar spread on an alkaline soil. Instead, it showed an influence on some physical chemical soil characteristics (aggregate stability and soil organic matter build up) that, if confirmed in the long term, can be of paramount importance on the hills of Mediterranean area.
Andreiuk, Bohdan. "Self-assembly of ionic fluorescent dyes inside polymer nanoparticles : engineering bright fluorescence and switching". Thesis, Strasbourg, 2017. http://www.theses.fr/2017STRAF027/document.
Texto completo da fonteEncapsulation of ionic dyes with help of bulky hydrophobic counterions into polymer nanomaterials emerged as powerful method for generating ultrabright fluorescent nanoparticles (NPs) for bioimaging. Here, this counterion-based approach is extended to cyanine dyes, operating from blue to near-infrared range. Based on cyanine-loaded NPs, a multicolour cell barcoding method for long-term cell tracking is developed. Second, the role of bulky hydrophobic counterion in self-assembly of cationic dyes inside polymeric NPs is studied by testing a large library of anions. We show that high hydrophobicity of a counterion enhances dye encapsulation, prevents particle aggregation and tunes dye clustering, while large size prevents dyes from self-quenching. Third, counterions based on aluminates and barbiturates are shown to outperform fluorinated tetraphenylborates. This work provides a solid basis for counterion-enhanced encapsulation and emission concept in preparation of dye-loaded fluorescent NPs
Dřímal, Jiří. "Parametry procesu spalování při využití vzduchu s obsahem kyslíku vyšším než 21 %". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231276.
Texto completo da fonteMorton, Jonathan Andrew Scott. "2D photonic crystals to enhance up-conversion emission for silicon photovoltaics". Thesis, Heriot-Watt University, 2016. http://hdl.handle.net/10399/3110.
Texto completo da fonteGanesan, Parameshwari. "Investigation of Luminescent Properties in Rare-Earth free Metallophosphonate Hybrid Materials : structural Insights in photophysical studies". Electronic Thesis or Diss., Normandie, 2023. http://www.theses.fr/2023NORMC266.
Texto completo da fonteThis thesis work systematically investigates the structural and photophysical properties of rare-earth-free metallophosphonate hybrid luminescent materials, emphasizing the role of structure in luminescent properties. Metallophosphonates demonstrate exceptional versatility with their coordination chemistry, highlighted by their ability to interact with multiple metal centers and form robust P-O-M metal bonds. We aim to study crystalline organic-inorganic hybrid luminescent materials in which the organic part provides a rigid platform which is easily modifiable with various functional groups. we present various metallophosphonate hybrids synthesized through the hydrothermal route using functionalized organic ligands such as Fluorene, Thianthrene, and Tetraphenylethylene (TPE) phosphonic acid with different alkaline-earth elements (Mg, Ca, Sr, Ba) and transition elements (Mn, Co, Cu, Zn). Different metallophosphonate materials are obtained by manipulating the nature of molecules, the number of functional groups, and the characteristics of cations in the structure. Due to that, the synthesized metallophosphonate hybrid materials exhibit diverse structural properties, including rigidity, thermal stability, and different arrangements like face-to-face or edge-to-face and herringbone stacking patterns. Furthermore, these materials display intriguing luminescent properties, such as Fluorescence, Room Temperature Phosphorescence (RTP), Bathochromic and Hypsochromic shift (red and blue shift), Excimer emission, and other novel green and red luminescence bands, particularly in the presence of specific cations. Lastly, we discuss and explore the interconnection between structural and physical properties including the phenomena of Aggregation Induced Emission (AIE) and Aggregation Enhanced Emission (AEE) for hybrid compounds
Adams, Thomas John. "Atmospheric measurements of biogenic and anthropogenic emissions by broadband cavity enhanced absorption spectroscopy". Thesis, University of Leicester, 2016. http://hdl.handle.net/2381/37611.
Texto completo da fontePekárek, Jan. "Katodové nanostruktury v MEMS aplikacích". Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-217244.
Texto completo da fontePreza, Fontes Giovani. "Managing cover crops and nitrogen fertilization to enhance sustainability of sorghum cropping systems in eastern Kansas". Thesis, Kansas State University, 2017. http://hdl.handle.net/2097/35267.
Texto completo da fonteDepartment of Agronomy
Peter J. Tomlinson
Growing cover crops (CCs) in rotation with cash crops has become popular in recent years for their many agroecosystem benefits, such as influencing nutrient cycling and reducing nutrient losses. This study aimed to (i) determine the long-term effects of no-till with CCs and varying nitrogen (N) rates on subsequent sorghum [Sorghum bicolor (L.) Moench] yield and yield components, (ii) assess how CCs affect the N dynamic in the soil-crop relationship during the growing season and N use efficiency (NUE) of sorghum, and (iii) define and evaluate important periods of nitrous oxide (N₂O) losses throughout the cropping system. Field experiments were conducted during the 2014-15 and 2015-16 growing season in a three-year no-till winter wheat (Triticum aestivum L.) – sorghum – soybean [Glycine max (L.) Merr] rotation. Fallow management consisted of a chemical fallow (CF) control plus four CCs and a double-crop soybean (DSB) grown after wheat harvest. Nitrogen fertilizer was subsurface banded at five rates (0, 45, 90, 135, and 180 kg ha⁻¹) after sorghum planting. On average, DSB and late-maturing soybean (LMS) provided one-third and one-half of the N required for optimum economic grain yield (90 kg N ha⁻¹), respectively; resulting in increased grain yield when compared to the other CCs and CF with 0-N application. Crimson clover (Trifolium incarnatum L.) and daikon radish (Raphanus sativus L.) had no or negative effects on sorghum yield and N uptake relative to CF across all N rates. Sorghum-sudangrass (SS) (Sorghum bicolor var. sudanese) significantly reduced N uptake and grain yield, even at higher N rates. Sorghum following CF had the lowest NUE at optimum grain yield when compared to all CC treatments, suggesting that CCs have a tendency to improve NUE. Cover crops reduced N₂O emissions by 65% during the fallow period when compared to CF; however, DSB and SS increased emissions when N was applied during the sorghum phase, indicating that N fertilization might be the overriding factor. Moreover, about 50% of the total N₂O emissions occurred within 3 weeks after N application, regardless of the cover crop treatment, indicating the importance of implementing N management strategies to reduce N₂O emissions early in the growing season. Overall, these results show that CC selection and N fertilizer management can have significant impacts on sorghum productivity and N₂O emissions in no-till cropping systems.
Muller, Jesse Michael. "Improving fertiliser nitrogen recovery and mitigating nitrous oxide emissions from intensive vegetable cropping systems in South East Queensland". Thesis, Queensland University of Technology, 2019. https://eprints.qut.edu.au/132721/1/Jesse_Muller_Thesis.pdf.
Texto completo da fonteDuhl, Tiffany Rae. "Advancing air quality modeling through improved urban vegetation characterization and an enhanced understanding of biogenic sesquiterpene emissions". Connect to online resource, 2007. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1442951.
Texto completo da fonteJen, Jen-Fon. "Analysis of Acid Gas Emissions in the Combustion of the Binder Enhanced d-RDF by Ion Chromatography". Thesis, University of North Texas, 1988. https://digital.library.unt.edu/ark:/67531/metadc331848/.
Texto completo da fonteGünther, Marcus. "Harte amorphe wasserstoffhaltige Kohlenstoffschichten mittels mittelfrequenzgepulster Plasmaentladungen". Doctoral thesis, Universitätsbibliothek Chemnitz, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-95197.
Texto completo da fonteHofgård, Daniel, e John Sundkvist. "Climate enhanced concrete in the civil engineering industry". Thesis, KTH, Betongbyggnad, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-278216.
Texto completo da fonteSveriges regering antog 2017 ett nytt klimatpolitiskt ramverk med målet att Sverige ska ha noll nettoutsläpp av växthusgaser år 2045. Betongindustrin har tagit fram en färdplan för hur betong kan bli klimatneutralt, där ett sätt att reducera klimatpåverkan från betong är att byta ut en del av cementklinkern mot alternativa bindemedel. Mald granulerad masugnsslagg (GGBS), flygaska, silikastoft och trass är alternativa bindemedel som är möjliga att använda i betongblandningar för att reducera mängden Portlandcement. GGBS, flygaska och silikastoft är restprodukter från andra industrier medan trass är en vulkanisk aska som kan utvinnas. Utöver den positiva miljöeffekten som erhålls när alternativa bindemedel ersätter cementklinker, så har de alternativa bindemedlen andra egenskaper, både positiva och negativa, som påverkar betongen. Målet med denna studie var att undersöka och jämföra om betongblandningar där en del av cementklinkern har ersatts med alternativa bindemedel når upp till de krav som ställs i nuvarande regelverk. Utöver det så undersöktes även hur betongblandningarnas materialparametrar påverkades av alternativa bindemedel. Betongblandningarna delades in i tre olika typer av betong: betong för broar (vct 0.4), vattenbyggnader (vct 0.45) och vindkraftverksfundament (vct 0.55), där totalt sju betongblandningar tillverkades i ett laboratorium. Betongblandningarna undersöktes i de tre olika faserna för hårdnande av betong, vilka är färsk, ung och hårdnad betong. De materialparametrar som analyserades var tryckhållfasthet, krympning, frostresistens, arbetbarhet, luftporhalt och temperaturutveckling. Förutom de experimentella testerna gjordes en jämförelse kring hur mycket koldioxid som kan reduceras för varje betongblandning, jämfört med en referensbetong för varje användningsområde. Betongblandningen med ett CEM II/A-V flygaska-cement och 15% GGBS visade stor potential med avseende på de olika materialparametrarna. Denna blandning är dock enligt svensk standard inte möjlig att certifiera för betongbyggnad i exponeringsklass XF4, exempelvis broar, men kan certifieras för betongbyggnad i exponeringsklass XF3, exempelvis fundament för vindkraftverk. Blandningen med 30% GGBS och 5% silikastoft visade även positiva egenskaper, men flyttillsatsmedel måste användas i denna blandning för att erhålla en god arbetbarhet. För vattenbyggnadsbetong så visade blandningen med 35% GGBS en hög tryckhållfasthet, men samtidigt en hög temperaturutveckling och en låg arbetbarhet. Blandningen med trass hade en noterbart låg temperaturutveckling, men med ökad krympning samt låg arbetbarhet. Avslutningsvis så uppvisade alla blandningar en frostresistens som enligt standard klassificeras som ”Mycket bra”.
Schlosser, Joseph S., Rachel A. Braun, Trevor Bradley, Hossein Dadashazar, Alexander B. MacDonald, Abdulmonam A. Aldhaif, Mojtaba Azadi Aghdam, Ali Hossein Mardi, Peng Xian e Armin Sorooshian. "Analysis of aerosol composition data for western United States wildfires between 2005 and 2015: Dust emissions, chloride depletion, and most enhanced aerosol constituents". AMER GEOPHYSICAL UNION, 2017. http://hdl.handle.net/10150/626273.
Texto completo da fonteLeix, Carmen [Verfasser], Jörg E. [Akademischer Betreuer] [Gutachter] Drewes, Susanne [Gutachter] Lackner e Eberhard [Gutachter] Morgenroth. "Innovative strategies for enhanced deammonification performance and reduced nitrous oxide emissions / Carmen Leix ; Gutachter: Jörg E. Drewes, Susanne Lackner, Eberhard Morgenroth ; Betreuer: Jörg E. Drewes". München : Universitätsbibliothek der TU München, 2017. http://d-nb.info/1141904667/34.
Texto completo da fonteMin, Zhenhua. "Catalytic steam reforming of biomass tar using iron catalysts". Thesis, Curtin University, 2010. http://hdl.handle.net/20.500.11937/184.
Texto completo da fonteBrändström, Urban. "The Auroral Large Imaging System : design, operation and scientific results". Doctoral thesis, Umeå University, Space Science, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-36.
Texto completo da fonteThe Auroral Large Imaging System (ALIS) was proposed in 1989 by Åke Steen as a joint Scandinavian ground-based nework of automated auroral imaging stations. The primary scientic objective was in the field of auroral physics, but it was soon realised that ALIS could be used in other fields, for example, studies of Polar Stratospheric Clouds (PSC), meteors, as well as other atmospheric phenomena.
This report describes the design, operation and scientic results from a Swedish prototype of ALIS consisting of six unmanned remote-controlled stations located in a grid of about 50 km in northern Sweden. Each station is equipped with a sensitive high-resolution (1024 x 1024 pixels) unintensified monochromatic CCDimager. A six-position filter-wheel for narrow-band interference filters facilitates absolute spectroscopic measurements of, for example, auroral and airglow emissions. Overlapping fields-of-view resulting from the station baseline of about 50 km combined with the station field-of-view of 50° to 60°, enable triangulation as well as tomographic methods to be employed for obtaining altitude information of the observed phenomena.
ALIS was probably one of the first instruments to take advantage of unintensi- fied (i.e. no image-intensifier) scientific-grade CCDs as detectors for spectroscopic imaging studies with multiple stations of faint phenomena such as aurora, airglow, etc. This makes absolute calibration a task that is as important as it is dificult.
Although ALIS was primarily designed for auroral studies, the majority of the scientific results so far have, quite unexpectedly, been obtained from observations of HF pump-enhanced airglow (recently renamed Radio-Induced Aurora). ALIS made the first unambiguous observation of this phenomena at high-latitudes and the first tomography-like inversion of height profiles of the airglow regions. The scientific results so far include tomographic estimates of the auroral electron spectra, coordinated observations with satellite and radar, as well as studies of polar stratospheric clouds. An ALIS imager also participated in a joint project that produced the first ground-based daytime auroral images. Recently ALIS made spectroscopic observations of a Leonid meteor-trail and preliminary analysis indicates the possible detection of water in the Leonid.
Yang, Chih-Min, e 楊智閔. "Ionic Luminogen with Aggregation-Enhanced Emission". Thesis, 2013. http://ndltd.ncl.edu.tw/handle/13225030049700524989.
Texto completo da fonte國立中山大學
材料與光電科學學系研究所
101
Restricted intramolecular rotation (RIR) of the non-coplanar aromatic fluorophores has been proven in several instances as the operative mechanism leading to the aggregation-enhanced emission (AEE) property. Besides using the bulky substituent as structural moiety of AEE-active materials, ionic bond interaction is also considered to be effective in reinforcing RIR. In this study, ionic ammonium sulfonate bond was used to introduce long chain orientation order and thus to impose effective RIR to generate emission enhancement on AEE-active organic fluorophores. With this aspect, a surfactant (surf) molecule of weakly-luminescent dodecylbenzenesulfonic acid (DBSA) was used to complex to different amines of varied structures and certain diamines (piperazine (PZ) and poly(ethyleneimine (PEI)) with right geometry to generate orientated dodecyl chains in the ionic products result in the further emission intensifications of the complex systems. Additionally, long-chain dodecylamine (DA) was used to react with weakly-fluorescent biphenyldisulfonate (BPS) and poly(styrene sulfonate) (PSS) to generate AEE-active materials with required orientation order and strong fluorescence due to the active RIR effect. An interesting aggregation-enhanced excimer emission (AEEE) was observed specifically for PSS(DA)1 complex system. Several complex systems (such as DBSA(PZ)x, DBSA(PEI)X, BPS(DA)x and PSS(DA)x ) were found to self-assemble into well-ordered supramolecular lamellar structures with the preferable orientation orders among their long aliphatic chains. RIR in relation to orientation order is therefore the main focus of this research.
Chien, Wei-Lun, e 簡偉倫. "Anthracene-Based Luminogen with Aggregation-Enhanced Emission". Thesis, 2013. http://ndltd.ncl.edu.tw/handle/04019539460649668011.
Texto completo da fonte國立中山大學
材料與光電科學學系研究所
101
In regards to the role of H-bond interaction as restriction forces on molecular rotation, we thereby explore further possibilities of using this facile strategy to generate AEE-active fluorescence systems with enhanced emissions. We used typical Heck coupling reaction to synthesis two different systems based on the facile H-bond interaction between H-bond donating hydroxyl and H-bond accepting pyridine functions are illustrated in this research. In chapter 2, an AEE-active dipyridine fluorophore was used to H-bond to monomeric diphenol (bisphenol A, BPA) and poly(vinyl phenol) (PVPh) to generate pseudo-linear and crosslinked systems, respectively, with beneficial AEE-active strong fluorescence. Instead of diphenol fluorophore, AEE-active diphenol compound was used in Chapter 3 as the fluorescent component to react with poly(vinylpyrrolidone) to generate peudo-crosslinked network with strong fluorescence. Both systems described in Chapter 2 and 3 are all subjected to different instrumentation analyses to identify the restricted molecular rations and the related enhanced emissions.
Tsai, Yao-ching, e 蔡耀慶. "UV-enhanced field emission property of ZnO nanowires". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/57875598006660603718.
Texto completo da fonte國立臺南大學
電機工程研究所
98
In this study we investigate the influence of field emission properties of the ZnO nanowires after being illuminated by UV light. We also compared the effect of different illumination (1.9 mW/cm2 and 3.2 mW/cm2) and different wavelength (UV-A:320-400 nm, UV-B:280-320 nm, UV-C:200-280 nm) of UV light. We discovered that more illumination could enhance more emission current, and reduce the turn–on voltage. However, UV-A light had stronger ability to enhance emission current. Then we measured three kinds of UV light at different pressure. It is observed that emission current of UV-A light had less fluctuation among different pressure. The others would decay more when environmental elements were worse. We also investigated the recovery current of three kinds of UV light. All of them took much time (20 min) for emission current to fall to its original value. After measuring the current characteristics, the stability of field emission was also investigated.
Tsai, Chun-Ping, e 蔡俊平. "Photo-Enhanced Field Emission Organic Light Emitting Diodes". Thesis, 2011. http://ndltd.ncl.edu.tw/handle/69203989403199258823.
Texto completo da fonte義守大學
電子工程學系碩士班
99
This thesis presents a structure of photo-enhanced field emission organic light emitting diodes (PEFEOLEDs) to enhance the luminous efficiency of organic light emitting diode, (OLED) of 1.52 times in the same current density. The PEFEOLEDs is composed by three parts: OLED acts as the anode, a field emission template of CNTs acts as the cathode, and a LED acts a light source. FEOLEDs is a current driven device, electrons and holes are injected from anode and cathode, respectively. And they will recombination at emission layer. Then it uses the field emission template of CNTs to emit extra electrons, that are injected in cathode of OLED. This way could make the numbers balance, that electrons and holes in OLED’s emitting layer, and improve the luminous efficiency of OLED. In this thesis, we provide the property of field emission template of CNTs first. It improves the stability and enhances the emission currents of CNTs’ template by annealing process. Furthermore, we have coated the wide band gap material of Magnesium Oxide (MgO) and Cesium Iodide (CsI) onto CNTs to reduce the work function of CNTs and enhanced the field emission capability of CNTs. And the field emission current density of the CNTs templates is 48.87 mA/cm2 under the electrical field of 1.47 V/μm. Then we insert the LED light source under the CNTs template can further increase the field emission current density to 62.5 mA/cm2 under the same electrical field of 1.4 V/μm. In this thesis, the FEOLEDs can effectively enhance the luminance efficiency of OLED to 1.32 times, and the luminance of OLED from 8124 cd/m2 to 9751 cd/m2. Furthermore,we use a LED light source to enhance the luminance efficiency of OLED to 1.52 times, and the luminance of PEFEOLEDs 11937 cd/m2.
Lan, Yin-Feng, e 藍銀鋒. "Thermionic Emission Enhanced Sputter Deposition of PZT Thin Film". Thesis, 2004. http://ndltd.ncl.edu.tw/handle/14537203969709951151.
Texto completo da fonte逢甲大學
材料科學所
92
In recent years, micro-electromechanical systems (MEMS) have been widely investigated in order to develop intelligent sensor or actuators. Lead zirconate titanate (PZT) films are supposed to be applied in many ferroelectric devices of MEMS such as micro-actuators, sensor, and ultrasonic motors. Thus, to deposit high quality PZT films is necessary. But in most research results, the deposition temperature must be raise to 550-700℃ to obtain ferroelectric perovskite structure. Such high deposition temperature causes many detrimental effects in the device producing process inducing inter-diffusion between layers and thermal stress etc. Progress has been made to obtain PZT thin film at low deposition temperature using PZT growth on seed layer, laser ablation and rapid thermal annealing etc. In this study, the PZT thin films were deposited by using a dual-target (PZT/PbO) sputter system, with intensified plasma enhanced by using thermionic electron emission technique. The processing temperature is expected to be decreased while maintaining high quality PZT thin film. The influence of the intensified plasma to the microstructure of PZT film will be investigated and correlated to its ferroelectric properties. The result show: without/with thermionic enhance sputtering PZT thin films, the deposition temperature must be upon 580 ℃ to obtain perovskite structure. Deposition rate of PZT thin film is higher at low deposition temperature and obtain PZT thin film growth rate increasing 1.72 times with thermionic. The polarization values of PZT thin film deposited by without thermionic and with thermionic sets are Pr=13 µC/cm2,Ps=31 µC/cm2 and Pr=18 µC/cm2,Ps=45 µC/cm2 respectively.
Teng, Siang-ling, e 鄧湘霖. "Ionic Interaction in Fluorescent Complexes with Aggregation-Enhanced Emission". Thesis, 2014. http://ndltd.ncl.edu.tw/handle/43ea53.
Texto completo da fonte國立中山大學
材料與光電科學學系研究所
102
Abstract-1 A fluorescent biological sensor utilizing aggregation-enhanced emission (AEE) property was developed in our laboratory. First, anAIE-active fluorescent tetraphenylthiophene (TP) unit was synthetically connected to poly(N-isopropylacrylamide) by covalent and ionic bonds, resulting in the respective c- and i-TP-PNIPAM for the detection and quantification of the bovine serum albumin (BSA) model protein. When bind to BSA, the ionic i-TP-PNIPAM shows much better fluorescence (FL) sensitivity compared to c-TP-PNIP AM. The fluorescence (FL) intensity of i-TP-PNIAPM displays a good linear dependence on concentration of BSA (0 – 1 mg/mL), indicating quantitative fluorimetric protein detection can be achieved. Further addition of anionic surfactant ofsodium dodecylsulfate (SDS) considerably raised the FL intensity of the complexsolution. All the FL response was discussed in term of conformational freedom of the TP unit under different environmental constraints. Abstract-2 A water-soluble fluorophore containing four anionicsulfonated groups, sodium tetraphenylthiophenesulfonate (TPS), was sythesizedand characterized to have aggregation-enhanced emission (AEE) property. One the other hand, acidified Jeffamine (diammonium-terminated poly(propylene glycol) and Jeffamine-included β-cyclodextrin (β-CD) were separatedly prepared. Through the facile ionic interaction between sulfonate anion in TPS and ammonium cation in Jeffamine (or in Jeffamine-included β-CD), fluorescent ionic complex of iTP-JA (or iTP-CD-JA) can be prepared and their emission behavior was correlated with the degree of restricted intramolecular rotation (RIR), as the main mechanism responsible for AEE phenomenon, in each system of different molecular structures. When bind to polymeric Jeffamine, iTP-JA complex emits with higher intensity than the small-mass TPS. Use of β-CD rigidify the flexible Jeffamine, therefore, iTP-CD-JA complex is the most efficient emitter among all three samples.
Hsiao, Tai-Shen, e 蕭待森. "Organic and polymeric Schiff-base with Crystallization-enhanced emission". Thesis, 2014. http://ndltd.ncl.edu.tw/handle/2zny75.
Texto completo da fonte國立中山大學
材料與光電科學學系研究所
102
Restricted intramolecular rotation (RIR) of the non-coplanar aromatic fluorophores has been proven in several instances as the operative mechanism leading to the aggregation-enhanced emission (AEE) property. Besides using the bulky substituent as structural moiety of AEE-active materials, crystallization is also considered to be effective in reinforcing RIR. In chapter 1, An organic azine derivative of CN4OH, containing both of the para- and the ortho-hydroxyl (p- and o-OH) groups, is a fluorescent material with its emission efficiency dependent on the degree of crystallinity. With inherent hydroxyl groups, CN4OH can be homogeneously blended with different amounts of poly(4-vinyl pyridine) (PVP) through intermolecular hydrogen-bond (H-bond) interactions. With the incorporations of one and two molar equivalents of PVP, the solid CN4OH/PVP(4/1) and (2/1) blends emit strongly with intensity larger than the pure CN4OH. Nevertheless, further increase of the PVP content considerably reduced the crystallinity and the emission efficiency of the blend. Initially, PVP was preferably H-bonded to the p-OHs of CN4OH, resulting in the beneficial crystallization-enhanced emission (CEE); nevertheless, the PVP added in the later step started to bond to the o-OHs of CN4OH, reducing the crystallinity and the CEE-related fluorescence. With appropriate H-bond interaction, the CN4OH/PVP(2/1) blend emits with a high quantum yield (ɸF) of 88%, in contrast to the low ɸF of 15% for pure CN4OH. In chapter 2, Polymeric luminogen with Aggregation-enhanced emission (AEE) and crystallization-enhanced emission (CEE) behavior was prepared and characterized in this study. Schiff-base polymeric luminogen was prepared via the ring opening polymerization. First, we synthesized different molecule weight of Polymeric luminogen to observed crystallinity relative emission impact. Then the emission behavior of the CN-PLLA(n)s in heat treatment and solvent annealing was shown to correlate with CEE behavior, We was prepared a amorphous film by heat treatment then comparison with crystalline film, the crystal film emission is better than amorphous film. Then we will amorphous film do solvent annealing, after solvent fuming process, we check WAXD. In WAXD, have displays sharp reflection peaks and emission was gradually enhanced with increasing exposure time. Therefore, CN-PLLA(n)s is a fluorophore with CEE character.
Neal, Terrell Demetris. "Surface Plasmon Enhanced Light Emission from Organic Light Emitters". Thesis, 2006. https://thesis.library.caltech.edu/3698/1/Terrell_D_Neal.pdf.
Texto completo da fonteDangwal, Arti [Verfasser]. "Enhanced field emission from metallic surfaces and nanowires / Arti Dangwal". 2007. http://d-nb.info/986360023/34.
Texto completo da fonteSokolowski, James Kurt. "The formation of enhanced, low-ionization emission in galactic halos". Thesis, 1992. http://hdl.handle.net/1911/16590.
Texto completo da fonteChen, Tai Lin, e 陳泰霖. "Aggregation Enhanced Emission and Piezochromism of Nitrogen Containing Heterocyclic Luminogen". Thesis, 2013. http://ndltd.ncl.edu.tw/handle/42063937618355335109.
Texto completo da fonte國立中山大學
材料與光電科學學系研究所
101
Abstract - 1 Two tri-armed piezofluorochromic compounds of tris(4-(4-phenylquinolin-2-yl)phenyl)amine (TPA-3Qu) and tris(4-(6-(9H-carbazol-9yl)-4-phenylquinolin-2-yl)phenyl)amine (TPA-3QuCz) were prepared and found to exhibit keen fluorescence responses toward pressurization. With the framework of a twisted, pyramidal triphenylamine (TPA) center connecting to three large quinolinecarbazole (QuCz) arms, TPA-3QuCz is amorphous material exhibiting a large bathochromic shift of 112 nm under gentle grinding forces, which is in widely contrast to the small shift of 32 nm for TPA-3Qu when subjected to a high pressure load of 10 MPa. By heating to high temperatures, both TPA-3QuCz and TPA-3Qu also exhibited the same bathochromic shifts as pressurization did. Conformational transformations involving planarization of the arms were proposed to account for the observed fluorescence responses of TPA-3QuCz and TPA-3Qu towards pressure and heating. Abstract -2 In this study, organic molecules of 4,4''-((1E,1''E)-((3,4-diphenylthiophene-2,5-diyl)bis(4,1-phenylene))bis(ethene-2,1-diyl))dipyridine (TP-2Py) with smaller substituent and 4,4''-((1E,1''E)-((3,4-diphenylthiophene-2,5-diyl)bis(4,1-phenylene))bis(ethene-2,1-diyl))bis(N,N-diphenylaniline) (TP-2TPA) with stronger substituent were prepared and characterized to identify their photoluminescent (PL) responses toward the effect of aggregation emission enhancement (AEE). Comparing the fluorescence intensity for TP-2Py and TP-2TPA , no matter in the solid or solution state, the fluorescence of TP-2TPA is stronger than the TP-2Py. By the study influence of temperature on solution emissions of TP-2Py and TP-2TPA, and computer simulation, we realized the compound of TP-2TPA which could effective restriction on molecular rotation than the compound of TP-2Py. With the effector of effective restriction on molecular rotation, TP-2TPA can block the non-radiative energy loss, to enhance the efficiency of luminescence. In another way, we also blends with hydroxyl-containing components (poly( vinyl alcohol) (PVA)) on both compounds,TP-2Py and tp-2TPA,. After blending with the hydroxyl components, the fluorescence can be further intensified due to the further restricted molecular rotation, though the facile intermolecular hydrogen-bond (H-bond) interactions between the nitrogen containing heterocyclic and the hydroxyl functions.
Su, Chuan-Tsung, e 蘇傳宗. "Enhanced Radiative Emission in Carbon-based Nanomaterials Decorated GaN nanorods". Thesis, 2013. http://ndltd.ncl.edu.tw/handle/52899208664580385342.
Texto completo da fonte國立臺灣海洋大學
光電科學研究所
101
We report the study on the enhancement of the photoluminescence (PL) in the nanocomposites including reduced graphene oxide nanoflakes (RGO)/GaN nanorods (NRs) and carbon nanodots (CNDs)/GaN NRs using 266 nm Nd:YAG laser excitation. We show that the enhanced PL emission in RGO/GaN NRs can be attributed to the coupling between the optical transition of GaN NRs and the surface plasmon resonance of the reduced graphene oxide nanoflakes, induced by the GaN NRs surface roughness. Moreover, the random lasing of CNDs/GaN NRs was observed because of the enhanced light scattering processes resulted from the CNDs. The approach we describe here will be useful for the future development of efficient optoelectronic devices and offers an alternative route for application of reduced graphene oxide and carbon nanodots.