Tesi sul tema "Quantin (Firm)"
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1
Tate, Eric Jordon. "Quantum Mechanics". Digital Commons at Loyola Marymount University and Loyola Law School, 2018. http://www.kaltura.com/tiny/8izg0.
Testo completo
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Campagnol, Alberto <1990>. "The Venetian "meaningful" firms: a quanti-qualitative analysis". Master's Degree Thesis, Università Ca' Foscari Venezia, 2015. http://hdl.handle.net/10579/7318.
Testo completoAbstract (sommario):
What is the future for the organizations in the Veneto Region? Will they be able to react to the crisis and to the new Eastern competitors? What are the guidelines to follow in order to create virtuous business ecosystems that drive the Venetian renaissance?
Those are the main questions this paper tries to give an answer through the results of a strategic project in which collaborated the Veneto Region, Ca' Foscari University of Venice and Confindustria Veneto: Innovarea.
The project analyses the competitiveness of the small and medium sized firms in the Venetian context, but this kind of analysis can be extended at a national level and represents a concrete plan for the economic recovery of our Country. This is an actual problem of our economy because despite the fact we live in a Country with an enormous potential, we are not able to exploit our resources and our creativity, because something is missing. The attitude of most of our firms is too closed and self-interested and this is the biggest limit to overcome in order to hope in a renewed competitiveness.
This paper presents the Innovarea project, its mission and its strategic themes and then provides some data about the strategic guidelines of 100 "meaningful" firms, collected through an on-line questionnaire and four detailed case studies about the history, strategy and mission of four "antifragile" firms that have been able to successfully react to the economic crisis after the year 2008.
The results of this paper want to encourage all the other small/medium sized firms that faced some problems after the economic crisis, to take the antifragile firms' attitude as an example to follow in order to grow and to create a connected network of collaborations between organizations. I think that no other statements better fit the situation more than in this case: unity is strength.
3
Peace, Daniel C. "Thin-film Lithium Niobate for Integrated Quantum Optics". Thesis, Griffith University, 2022. http://hdl.handle.net/10072/420851.
Testo completoAbstract (sommario):
The generation of broadband squeezed light is a vital resource within continuous-variable quantum information processing. In light-based quantum computation protocols, the amount of squeezing impacts computation error rates, therefore achieving fault-tolerant quantum computation requires a sufficiently high level of squeezing. Traditionally, squeezed light has been generated using bulk nonlinear crystals located within optical cavities, however this comes at the cost of a narrow squeezing bandwidth which reduces operational speed. Recently, the thin-film Lithium Niobate has emerged as a promising material platform for the generation of broadband squeezed light, however current demonstrations have been limited. In this work using periodically polled nanophotonic waveguides in thin-film Lithium Niobate, we study the generation and manipulation of broadband squeezed light. In utilising the high peak powers offered by ultrashort pulses we demonstrate for the first time, the generation of broadband squeezed light in a Silicon-Nitride strip loaded thin-film Lithium Niobate waveguide at telecommunication wavelengths. Furthermore, we theoretically investigate the performance of an integrated coherent feedback squeezer, a device which enables coherent control over the level of squeezing. These results contribute to the realisation of a fault-tolerant photonic quantum computer and development of continuous-variable quantum information processing.Thesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Environment and Sc
Science, Environment, Engineering and Technology
Full Text
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Coe-Sullivan, Seth (Seth Alexander). "Hybrid organic/quantum dot thin film structures and devices". Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/33935.
Testo completoAbstract (sommario):
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2005.Includes bibliographical references (p. 157-169).
Organic light emitting diodes have undergone rapid advancement over the course of the past decade. Similarly, quantum dot synthesis has progressed to the point that room temperature highly efficient photoluminescence can be realized. It is the purpose of this work to utilize the beneficial properties of these two material sets in a robust light emitting device. New deposition techniques are necessary to the realization of this goal, enabling QD organic hybrids to be created in a quick and reliable manner compatible with known device fabrication methods. With these techniques, quantum dot light emitting devices are fabricated, measured, and analyzed. The devices are of high efficiency and color saturation, and provide us with a test bed for understanding the interactions between inorganic QDs and organic thin films.
by Seth Coe-Sullivan.
Ph.D.
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ELSEHRAWY, FARID KHALED MOHAMED FARID. "Photon Management for Thin-Film Quantum Dot Solar Cells". Doctoral thesis, Politecnico di Torino, 2020. http://hdl.handle.net/11583/2843974.
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Sparks, Aaron, Crystal Kolden, Alan Talhelm, Alistair Smith, Kent Apostol, Daniel Johnson e Luigi Boschetti. "Spectral Indices Accurately Quantify Changes in Seedling Physiology Following Fire: Towards Mechanistic Assessments of Post-Fire Carbon Cycling". MDPI AG, 2016. http://hdl.handle.net/10150/621493.
Testo completoAbstract (sommario):
Fire activity, in terms of intensity, frequency, and total area burned, is expected to increase with a changing climate. A challenge for landscape-level assessment of fire effects, often termed burn severity, is that current remote sensing assessments provide very little information regarding tree/vegetation physiological performance and recovery, limiting our understanding of fire effects on ecosystem services such as carbon storage/cycling. In this paper, we evaluated whether spectral indices common in vegetation stress and burn severity assessments could accurately quantify post-fire physiological performance (indicated by net photosynthesis and crown scorch) of two seedling species, Larix occidentalis and Pinus contorta. Seedlings were subjected to increasing fire radiative energy density (FRED) doses through a series of controlled laboratory surface fires. Mortality, physiology, and spectral reflectance were assessed for a month following the fires, and then again at one year post-fire. The differenced Normalized Difference Vegetation Index (dNDVI) spectral index outperformed other spectral indices used for vegetation stress and burn severity characterization in regard to leaf net photosynthesis quantification, indicating that landscape-level quantification of tree physiology may be possible. Additionally, the survival of the majority of seedlings in the low and moderate FRED doses indicates that fire-induced mortality is more complex than the currently accepted binary scenario, where trees survive with no impacts below a certain temperature and duration threshold, and mortality occurs above the threshold.
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Jean, Joel Ph D. Massachusetts Institute of Technology. "Performance limits for colloidal quantum dot and emerging thin-film solar cells". Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/111858.
Testo completoAbstract (sommario):
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2017.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 200-224).
Emerging thin-film solar photovoltaic (PV) technologies can be made lightweight and flexible with simple manufacturing methods, allowing rapid scale-up and ubiquitous deployment of solar power. However, for most emerging PV technologies-including colloidal quantum dots (QDs), perovskites, and organics-power conversion eciency and stability remain major obstacles to commercial development. In this thesis, we evaluate the long-term potential of emerging thin-film PV technologies, focusing on performance limits for QD solar cells in the face of inefficient charge extraction and energetic disorder. First, we introduce material complexity as a framework for analyzing PV technologies and assess the performance and scalability of all leading technologies on equal footing. This analysis points to a unique advantage of emerging thin films-high power-to-weight ratios. As a proof of concept, we demonstrate a process for producing thin, lightweight, transparent, laminable, and flexible PV substrates based on in situ vapor-phase growth of parylene-C films. This approach enables ultra-thin molecular organic solar cells with efficiencies and yields comparable to glass-based cells and weight-specfic power exceeding 6 W/g. Next, we address inefficient charge extraction in QD solar cells by demonstrating an ordered bulk heterojunction device architecture based on solution-grown ZnO nanowire arrays and PbS QDs. The nanowires decouple light absorption from charge extraction, improving the short-circuit current density by 50% and the power conversion eciency by 35%. Finally, we attempt to answer the question "Are QD solar cells worth pursuing further?" We use photothermal deflection spectroscopy to characterize disorder-induced band tailing in PbS QD films across dierent QD sizes, ligands, and processing conditions. Based on these measurements, we calculate radiative eciency limits ranging from 26% to 32%, which suggests that disorder does not severely constrain the long-term potential of PbS QD solar cells.
by Joel Jean.
Ph. D.
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Bryngelsson, Erik. "Manufacturing optimization and film stability analysis of PbS quantum dot solar cells". Thesis, KTH, Skolan för kemi, bioteknologi och hälsa (CBH), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-260053.
Testo completoAbstract (sommario):
Semiconductor colloidal quantum dots have an interesting potential to increase solar cell efficiency, with strong absorption in the infrared region and a tunable band gap. In this work an attempt was made to adopt a manufacturing process for PbS quantum dot solar cells, proven successful at Uppsala University. Two optimizations were investigated and the stability of the quantum dot films was analyzed with regards to three storage conditions, varying oxygen accessibility and light exposure, and measured with UV-Vis spectroscopy and X-ray photoelectron spectroscopy. Functioning solar cells were obtained but with lower performance than the results from Uppsala. Optimizations were partly successful with regards to improved spreading of the EDT solution on the PbS quantum dot film using ethanol and methanol as solvents. No improved cell performance was observed by applying both QD films inside argon atmosphere, as opposed to only the first one. Clear differences in oxidization of the films and loss of iodine ligand could be identified for the different storage conditions, with best stability exhibited by films stored under argon atmosphere.Kvantprickar av halvledande material har en intressant potential att förbättra solcellers verkningsgrad genom en stark absorption inom de infraröda spektrat och ett justerbart bandgap. I detta arbete gjordes ett försök att återskapa en tillverkningsprocess av kvantprickssolceller av PbS, som visat sig framgångsrik vid Uppsala universitet. Två optimeringar undersöktes och stabiliteten av kvantpricksfilmerna analyserades med avseende på tre förvaringsmiljöer med olika exponering för ljus och syre, och mättes med UV-visspektroskopi samt röntgenfotoelektronspektroskopi. Fullt fungerande solceller framställdes men med en lägre prestanda jämfört med resultaten i Uppsala. Optimeringarna var delvis lyckade gällande spridning av EDTlösningen på kvantpricksfilmen av PbS genom att använda etanol och metanol som lösningsmedel. Ingen förbättrad prestanda observerades hos cellerna genom att applicera båda kvantpricksfilmerna i argonatmosfär, jämfört med endast den första. Tydliga skillnader i oxidation för filmerna samt förluster av jodligand kunde identifieras för de olika förvaringsmiljöerna, med bäst stabilitet uppvisad av filmerna som förvarades i argonatmosfär.
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VanSant, Kaitlyn. "Thin Film Solar Cells Using ZnO Nanowires, Organic Semiconductors and Quantum Dots". PDXScholar, 2007. https://pdxscholar.library.pdx.edu/open_access_etds/2696.
Testo completoAbstract (sommario):
A thin film organic/ inorganic hybrid solar cell was fabricated by incorporating ZnO nanowires, n- and p-type organic semiconductors and inorganic quantum dots. The basic cell design involved the electrodeposition of ZnO nanowires grown on a substrate coated with a transparent conductive oxide. The ZnO nanowires were coated with a thin layer of an organic n-type material, followed by a deposition of inorganic quantum dots. A p-type polymer layer was subsequently deposited and the sample was then contacted with gold to form a quantum dot layer sandwiched between a p-n junction of organic conductive materials.
Various materials and processing methods were adjusted, using I-V characteristics, photovoltage and/ or photocurrent measurements to determine the performance of the cell. Each constituent material in the basic device design was evaluated in terms of its contribution to the sample characteristics. A variety of deposition techniques were investigated to obtain homogeneous layers. Different annealing procedures were explored with the intent of balancing the time and temperatures required for electrical activation with material constraints such as tendency towards oxidation and low melting points. The effect of time on the sample characteristics was also observed. The evaluation primarily includes data for samples that led to design modifications aimed at improving both electrical properties and quantum efficiencies.
This research led to the development of a hybrid solar cell sensitized by the addition of quantum dots. The organic semiconductors were used to form a p-n junction, and the p-type polymer also served as an active absorber layer. The quantum dots were used as the inorganic absorber fayer, and the results show that the range of optical absorption in the cell can be modified by adjusting particle size. In addition, the ZnO nanowires appear to improve charge transfer, when used with materials that have favorable band offsets.
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So, Kin-wah. "A study of strategic orientations and perspective of professional quantity surveying consultant firms in Hong Kong /". Hong Kong : University of Hong Kong, 1995. http://sunzi.lib.hku.hk/hkuto/record.jsp?B25947746.
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Hutson, D. "The design, construction and operation of practical thin film superconducting quantum interference devices (SQUIDs)". Thesis, University of Strathclyde, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.382345.
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Borrego, Dulce Armonía. "Value Equivalency Analysis: Quantity Compensation, Distance Decay, And Time Treatment". Doctoral thesis, Universitat Autònoma de Barcelona, 2011. http://hdl.handle.net/10803/42010.
Testo completoAbstract (sommario):
La compensación ambiental se refiere a la provisión adicional de recursos naturales, servicios ecológicos o de bienestar social a través de proyectos de reparación que son equivalentes en magnitud a las pérdidas producidas por daños ambientales. En la Unión Europea, la Directiva de Responsabilidad Medioambiental establece el marco legal para introducir responsabilidad ambiental debido a daños producidos al medio ambiente por actividades industriales. La responsabilidad ambiental establece que los recursos naturales dañados deben devolverse al estado que hubieran tenido de no producirse el daño en cuestión (restauración primaria) así como la provisión de una compensación por pérdidas acumuladas (o pérdidas provisionales) producidas desde el momento en que ha ocurrido el incidente hasta que el medio ambiente ha vuelto a su estado original (restauración compensatoria). Los Análisis de Equivalencia representan un instrumento que se utiliza para determinar la cuantía por daños al medio ambiente. Esta investigación aplica una metodología de análisis de equivalencia conocida como método valor-a-valor como una herramienta para escalar la cantidad de remediación requerida y de esta manera estimar la cantidad de reparación para compensar las pérdidas ambientales producidas tras un incendio forestal ocurrido en el noreste de España. Para efectos del Análisis de Equivalencia de Valor (AEV) se ha diseñado un ejercicio de Valoración Contingente (VC) que estima la media de la cantidad mínima de compensación física requerida para compensar los daños producidos según las preferencias sociales. A continuación, el estudio explora cuestiones que tienen que ver con la localización del proyecto de remediación cuando éste se sitúa a cierta distancia del sitio dañado. Intuitivamente, la idea de que la ubicación de un proyecto de restauración se encuentre alejado de la ubicación inicial (la zona dañada) podría implicar una mayor cantidad de compensación en comparación a un proyecto de reparación localizado más próximo al sitio del daño. Para este fin se ha diseñado un ejercicio adicional que utiliza modelos de elección que permite estimar la cantidad de compensación requerida cuando el proyecto de reparación se localiza en un sitio distinto al de la zona afectada. Finalmente, la última parte de esta investigación explora los efectos en la disposición a pagar de la información proporcionada en el cuestionario relacionada con los pagos de un programa de reparación; específicamente, cómo pagarán por el programa y si los pagos corresponden a valores nominales o reales. Con el fin de analizar este tema la pregunta de valoración toma una forma dicotómica simple en la cual los pagos deben hacerse anualmente, durante diez años, y con incrementos anuales de acuerdo a la inflación.Environmental compensation implies the provision of additional natural resources, services or social welfare through restoration projects that are scaled to equal the losses due to environmental damage. The Environmental Liability Directive provides legal framework in the European Union for introducing environmental liability due to damages to the environment caused by industrial operators. Environmental liability requires that harmed natural resources be restored to baseline conditions (primary restoration) and compensated for the accumulated losses (interim losses) produced from the time of the incident until the environment reaches baseline conditions (compensatory restoration). Equivalency Analysis is a methodology used to determine compensation for environmental damage. This study uses an Equivalency Analysis (EA) approach namely the value-to-value approach as a tool to scale remediation and to estimate the amount of compensatory restoration to off-set an environmental damage following a wild forest fire in the northeast of Spain. Value Equivalency Analysis (VEA) is undertaken by a Contingent Valuation (CV) exercise to determine the welfare loss from the initial damage and interim loss and then a remediation project that can be established based on that information. The study elicits the minimum amount of compensation required to make individuals as well off as they would be in the baseline situation. After this the study explores remediation located at a geographical distance from the site of damage. In some cases displacement between damaged resources and restored resources is allowed, this study explores whether longer distance from the damaged site could imply a larger amount of compensation to offset the change in natural resource location. For this, an additional exercise was designed to estimate the trade-off rate for compensating in a farther away site using choice experiment techniques. Finally, the last section focuses on the information provided to respondents regarding payments in the survey instrument. This includes informing respondents how they would pay for the restoration program and whether payments correspond to nominal or real values. The survey instrument takes the form of a single bounded dichotomous choice where the payments are to be made every year over a ten year period and they would go up every year according to inflation.
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SONG, YONG. "Electrical Transport Measurement of Niobium Thin Superconducting Film Above An Array of Magnetic Quantum Dots". University of Cincinnati / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1212102762.
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Bothner, Daniel [Verfasser], e Reinhold [Akademischer Betreuer] Kleiner. "Micropatterned Superconducting Film Circuitry for Operation in Hybrid Quantum Devices / Daniel Bothner ; Betreuer: Reinhold Kleiner". Tübingen : Universitätsbibliothek Tübingen, 2014. http://d-nb.info/1162897465/34.
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Lee, Sherwin Frank. "An evaluation of management’s impact on knowledge and related service diversification within quantity surveying firms". Thesis, Cape Peninsula University of Technology, 2014. http://hdl.handle.net/20.500.11838/1045.
Testo completoAbstract (sommario):
Thesis submitted in fulfilment of the requirements for the degree of
Master of Technology in Construction Management
Department of Construction Management and Quantity Surveying
in the Faculty of Engineering at the
Cape Peninsula University of Technology
2014Many South African quantity surveying practitioners are not committed to developing knowledge and skills, a factor that may hinder the development and viability of the firm. Owing to this problem, the research focuses on the strategic role of management with an emphasis on the support mechanisms for learning and the development of knowledge. The research population focuses on professional quantity surveying firms in the Western Cape region of South Africa. The aim of the research is to understand and identify key components of management‟s strategic influence on: (a) the organisation‟s culture, (b) the development of knowledge and (c) the development of related services and skills within professional quantity surveying firms. The research methodology consists of both qualitative and quantitative methods. Management members provided qualitative data by participating in interviews and staff members provided quantitative data by completing questionnaires. The data for the research comprised a criterion sample of eleven small- and medium-sized diversified firms. The core elements of the research are the organisational culture, learning, and the development of knowledge and service diversification. The research expands information on management‟s role in the organisation‟s culture and development of knowledge in professional quantity surveying firms. The research found that there are many supportive learning elements within the organisational cultures of most quantity surveying firms. Most management members discuss employee development and performance issues, and the lessons learnt from projects. Management occasionally mentors employees and regularly allows employees to undertake challenging work activities. Management members do not, however, include employees in the development of the firm‟s related services. Management primarily established related services because there was a need for these services. The development and transfer of related service knowledge and skills are restricted to management members to a large degree. Management‟s influence on the development of knowledge and skills of employees is somewhat limited and inconsistent. Organisational culture factors such as job satisfaction and the professional development of staff members have to be given appropriate attention by management, especially from a consistency and formal standpoint. Elements that require reviewing include the time allocated for internal learning activities and learning initiatives, other than on-the-job training. Service diversification factors, such as management members restriction of staff members to core quantity surveying services, also have to be reconsidered. Elements of some related services may improve the quality of core quantity surveying services. KEYWORDS: QUANTITY SURVEYING; PROFESSIONAL SERVICE FIRM; CULTURE; LEARNING; KNOWLEDGE; SERVICE DIVERSIFICATION
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Al, Imam Shahriar. "Simulation of a 2D pn junction in silicon thin film incorporating quantum transport for carriers". Thesis, Connect to online version, 2006. http://proquest.umi.com/pqdweb?did=1251871411&sid=3&Fmt=2&clientId=10306&RQT=309&VName=PQD.
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Haber, Johann Friedrich Albert [Verfasser], e Ralf [Akademischer Betreuer] Röhlsberger. "Hard X-ray Quantum Optics in Thin-Film Nanostructures / Johann Friedrich Albert Haber ; Betreuer: Ralf Röhlsberger". Hamburg : Staats- und Universitätsbibliothek Hamburg, 2017. http://d-nb.info/1134866046/34.
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So, Kin-wah, e 蘇健華. "A study of strategic orientations and perspective of professional quantity surveying consultant firms in Hong Kong". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1995. http://hub.hku.hk/bib/B31251420.
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Erwin, Elizabeth G. "Measuring and Understanding Effects of Prescribed Fire in a Headwater Catchment". Thesis, Virginia Tech, 2019. http://hdl.handle.net/10919/91422.
Testo completoAbstract (sommario):
Headwater catchments play a large role in the storage and release of water and chemical constituents, thereby influencing downstream flows and water quality. Recent advances in water quality monitoring technologies have created an opportunity to better assess water chemistry variation by using high temporal resolution, in situ sensors. However, despite these new technologies, there have been limited studies on installation approaches and their effects on sensor measurements. Accurate in situ monitoring is particularly important to capture catchment disturbance effects that may be highly dynamic over time (e.g., following storms) or limited in duration. For example, prescribed fire is a commonly applied forest management tool, but there remain questions regarding how this disturbance affects catchment soils and resultant stream water chemistry. Effective assessment of prescribed fire thus requires coupled monitoring of both soil properties and water chemistry. In this thesis, I addressed two linked objectives: i) assess the effects of commonly used protective housings on in situ sensor measurements (Chapter 2) and ii) evaluate prescribed burn effects in a southwestern Virginia, USA headwater catchment (Chapter 3). In Chapter 2, I compared four different housing types (mesh, screen, holes, and open) using in situ specific conductance measurements over time and from salt tracer injections for discharge estimates. This study demonstrated substantial effects from some of the housing types evaluated, where flow resistance reduced water exchange between stream water and water in contact with the sensor. From these findings, I suggest that in situ water quality sensors should be deployed in housing types with large openings perpendicular to flow. In Chapter 3, I assessed prescribed fire effects on soil properties (particle size, aggregate stability, and chemistry), stream discharge, and fine-scale water chemistry dynamics. Findings demonstrated some significant differences following fire in soil properties (e.g., overall decrease in aggregate stability, general decreases in total carbon and nitrogen of mineral soils), water quality (e.g., increased levels of DOC, turbidity, and nitrate) and discharge (increases in stage and flow). While these changes were statistically significant, differences in parameters before and after fire were generally small. Future work should examine if these effects persist through time, and whether the minor level of disturbance observed in this study results in any negative environmental impacts.Master of Science
Headwater catchments (where precipitation first becomes streamflow) provide important aquatic habitat and regulate downstream water flows and chemistry. Recent advances in water quality monitoring technologies have created an opportunity to better assess water chemistry variability by using high frequency, submerged water quality sensors. However, these new technologies present new, unique challenges, such as measurement errors that may be induced by different installation methodologies. Accurate measurements are particularly important to evaluate how changes in catchment conditions (e.g., soils, vegetation) impact local and downstream water quality. For example, prescribed fire is a commonly used forest management tool, but questions remain about how it affects catchment soils and headwater stream chemistry. Consequently, understanding the effects of this and other catchment disturbances requires coupled monitoring of both soil properties and water quality. In this thesis, I addressed two objectives: i) assess the effects of commonly used protective housings on water quality sensor measurements (Chapter 2) and ii) evaluate prescribed burn effects in a southwestern Virginia, USA headwater catchment (Chapter 3). In Chapter 2, I demonstrated substantial effects from some of the housings evaluated and suggest that water quality sensors should be deployed in housing types with large openings perpendicular to flow. In Chapter 3, I demonstrated some significant effects of prescribed fire on soil properties (e.g. overall decrease in soil stability, general decreases in total carbon and nitrogen of mineral soils), water quality (e.g., increased levels of dissolved organic matter, turbidity, and nitrate) and flow (increases in stream water levels and flow). While these changes were statistically significant, differences in parameters before and after fire were generally small. Future work should examine if these effects persist through time, and whether this minor level of disturbance causes any negative environmental impacts.
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ANUSIT, KAEWPRAJAK. "Improvement of Photovoltaic Properties of Solar Cells with Organic and Inorganic Films Prepared by Meniscuc Coating Technique". Kyoto University, 2019. http://hdl.handle.net/2433/242322.
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Bukowski, Tracie J. "The optical and photoconductive response in germanium quantum dots and indium tin oxide composite thin film structures". [Gainesville, Fla.] : University of Florida, 2002. http://purl.fcla.edu/fcla/etd/UFE1000111.
Testo completoAbstract (sommario):
Thesis (Ph. D.)--University of Florida, 2002.Title from title page of source document. Document formatted into pages; contains xiv, 137 p.; also contains graphics. Includes vita. Includes bibliographical references.
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Heeg, Kilian Peter [Verfasser], e Jörg [Akademischer Betreuer] Evers. "X-Ray Quantum Optics With Mössbauer Nuclei In Thin-Film Cavities / Kilian Peter Heeg ; Betreuer: Jörg Evers". Heidelberg : Universitätsbibliothek Heidelberg, 2014. http://d-nb.info/1180301013/34.
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Longo, Antonio Valerio. "Development of alternate-current thin-film electroluminescent devices based on manganese-doped zinc sulfide quantum-dot technology". Electronic Thesis or Diss., Université Paris Cité, 2021. http://www.theses.fr/2021UNIP7253.
Testo completoAbstract (sommario):
Ce travail de thèse concerne le développement d'un dispositif émetteur de lumière, basé sur des nanoparticules de sulfure de zinc dopées au manganèse,fonctionnant sous l'application d'une tension alternative. Notre dispositif est basé sur une configuration simple impliquant une seule couche de nanoparticules luminescentes, déposée par spin coating, placée entre deux films isolants. D’abord,nous avons étudié le système de nanoparticules d'un point de vue fondamental.Ces nanoparticules, synthétisées sans aucun tensioactif par une synthèse assistée par micro-ondes, sont caractérisées par une phosphorescence dans la région orange du spectre visible provenant du dopage au manganèse. Nous avons observé et étudié une augmentation de cette activité optique sous une exposition prolongée à la lumière UV. Notre analyse nous a permis d'attribuer ce phénomène à un effet de contrainte du réseau crystallin local autour des chromophores de manganèse dû à un processus d'oxydation de surface induit par la lumière UV.Dans une deuxième partie de notre travail, nous avons étudié les propriétés diélectriques des couches isolantes, constituées d'un film de oxyde d'hafnium déposé par Atomic Layer Deposition. En explorant plusieurs épaisseurs de couches et deux températures de dépôt, nous avons montré que la température plus basse fournit des résultats significativement plus fiables et robustes. De plus, nous avons également abordé la possibilité de déposer une couche d'alumine par une approche sol-gel en solution, mettant en évidence les principales limites de cette technique.Dans la troisième partie du manuscrit, nous décrivons les principales caractéristiques du dispositif complet. Nous avons observé la bande d'émission orange due au dopage au manganèse, ainsi que le comportement seuil typique de l'intensité de la lumière émise en fonction de la tension appliquée. En exploitant la caractérisation structurelle, les mesures de spectroscopie d'impédance et une comparaison avec des travaux théoriques sur des dispositifs similaires, nous avons pu affirmer que le mécanisme derrière l'émission de lumière observée est un processus de création de charge induite par le champ électrique dans la couche active, suivi par leur transport à travers la couche et d'un processus de recombinaison radiative à l'échelle de la nanoparticule individuelle. Par rapport aux travaux antérieurs basés sur le même type de nanoparticules, notre point clé a été l'utilisation de nanoparticules non enrobées qui ont permis d'obtenir un arrangement de nanoparticules très compact, favorisant le mécanisme physique mentionné ci-dessus. Notre travail constitue une avancée dans le développement de dispositifs électroluminescents plus compacts, industriellement réalisables et respectueux de l'environnementIn this work we address the development of a light-emitting device, based on manganesedoped zinc sulfide nanoparticles, working under the application of an alternate-current voltage. Our device is based on a simple capacitive configuration implying a single layer of spin-cast nanoparticles sandwiched between two insulating thin films. In the first part of our work, we studied the nanoparticle system from a fundamental point of view. These nanoparticles, synthesized without the use of any surfactant by a microwave-assisted synthesis, are characterized by a phosphorescence activity in the orange region of the visible spectrum stemming from manganese dopants. In our work, we have observed and studied an enhancement of this optical activity under prolonged UV-light exposition. Our investigation allowed us to ascribe this phenomenon to a local lattice-strain effect around manganese chromophores due to a surface oxidation process induced by UV light. In a second part of our work, we focused on the dielectric properties of the insulating layers, consisting in an hafnium oxide film deposited by atomic layer deposition. By exploring several layer thicknesses and deposition temperatures, we have optimized the dielectric properties of the film, leading to more reliable and robust results. Moreover, we have also addressed the possibility of depositing an alumina layer by an in solution sol-gel approach, highlighting the main limitations of this technique. In the third part of the manuscript, the main characteristics of the complete electroluminescent device are addressed. More specifically, we recovered the orange emission band due to manganese doping, as well as the typical threshold behavior of the intensity of the emitted light as a function of the applied voltage. By exploiting structural characterization, impedance spectroscopy measurements and a careful comparison with theoretical works on similar devices, we have been able to state that the mechanism behind the observed light emission is a fieldinduced charge-creation process within the active layer only, followed by charge transport across the layer and radiative recombination within a single nanoparticle. Compared to previous works based on manganese-doped zinc sulfide nanoparticles, our key point has been the use of uncoated nanoparticles which allowed to achieve a very compact nanoparticle arrangement, favoring the physical mechanism mentioned above. Our work constitutes a step forward in the development of more compact, industrially feasible and eco-friendly light emitting devices
24
Siu, Choi-pai Johnny. "Estate agency marketing in People's Republic of China : a business opportunity for a surveying professional firm in Hong Kong /". Hong Kong : University of Hong Kong, 1994. http://sunzi.lib.hku.hk/hkuto/record.jsp?B21020383.
Testo completo
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Chauhan, Lokendra Pratap Singh. "Modelling stock market performance of firms as a function of the quality and quantity of intellectual property owned". Thesis, Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/16218.
Testo completoAbstract (sommario):
This thesis attempts to analyze a part of the big and complex process of how intellectual
property ownership and technological innovation influence the performance of firms and
their revenues. Here I analyze a firm's stock market performance as a function of the
quantity and quality of intellectual property (patents) owned by the firm in context of the
three US high-technology sectors, Pharmaceuticals, Semiconductors and Wireless. In
these sectors, value of a firm is predominantly driven by the technologies which a firm
owns. I use citation based indicators and number of claims to measure the quality of
patents. This research presents empirical evidence for the hypothesis that in high-tech
sectors, companies which generate better quality intellectual property perform better than
average in the stock market. I also posit that firms which are producing better quality
technologies (good R&D) invest more in R&D regardless of their market performance.
Furthermore, though smaller firms get relatively less returns on quality and quantity of
innovation, they tend to invest a bigger fraction of their total assets in R&D when they
are generating high quality patents. Larger firms enjoy the super-additivity effects in
terms of market performance as the same intellectual property gives better returns to
them. In addition, returns to R&D are relatively higher in the pharmaceutical industry
than semiconductor or wireless industries.
26
Chauhan, Lokendra P. S. "Modelling stock market performance of firms as a function of the quality and quantity of intellectual property owned". Available online, Georgia Institute of Technology, 2007, 2007. http://etd.gatech.edu/theses/available/etd-07092007-111641/.
Testo completo
27
Brzezinski, Krzysztof. "Essays on effects of uncertainty on competition among firms and political parties". Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/essays-on-effects-of-uncertainty-on-competition-among-firms-and-political-parties(5338ac5b-9ebf-47e3-99a3-43bd37a5ec0a).html.
Testo completoAbstract (sommario):
This thesis investigates different aspects of competition under uncertainty using the tools of game theory. In Chapter 1, I consider a quantity oligopoly game. One of the firms is presented with an opportunity to commit to some output before the demand becomes known, but may add to it afterwards, then moving simultaneously with the rivals. I show that the more cost-efficient firm is more likely to behave like a Stackelberg leader, i.e. to produce the optimal Stackelberg leader quantity ex-ante and refrain from adding to it later, letting the rivals respond to its ex-ante output in the manner of Stackelberg followers. In Chapter 2, I study a model of an electoral contest. Two symmetric parties allocate their endowments to building platforms on various issues before the start of a campaign. Next, one of the issues becomes decisive in the course of the campaign with a commonly known probability. The outcome of the election depends on the difference in competence in this issue. I show that if the payoff functions are convex in this difference-the case of 'increasing returns to power'-parties differentiate each other by selecting different campaign issues. On the contrary, when the payoff functions are concave in this difference-the case of 'decreasing returns to power'-parties mimic each other by investing the same amounts into the same issues. Thus, incentives for selecting campaign issues depend critically on the shape of the payoff functions, which might be determined by (1) a non-linear technology transforming parties' investment in various topics into voters' perception of their competence, (2) or parties' inherent motivation for winning by a big margin due to parties' ideological convictions or rent-seeking, (3) or an electoral system giving winners or big parties a disproportionate advantage in the assigned number of seats, (4) or a relatively high extent of power given to the winning party once in office.
28
Huang, Wei-Jie, e Wei-Jie Huang. "Towards Increased Photovoltaic Energy Generation Efficiency and Reliability: Quantum-Scale Spectral Sensitizers in Thin-Film Hybrid Devices and Microcracking in Monocrystalline Si". Diss., The University of Arizona, 2016. http://hdl.handle.net/10150/623175.
Testo completoAbstract (sommario):
The present work focuses on two strategies contributing to the development of high efficiency, cost-effective photovoltaic (PV) technology for renewable energy generation: the design of new materials offering enhanced opto-electronic performance and the investigation of material degradation processes and their role in predicting the long-term reliability of PV modules in the field. The first portion of the present work investigates the integration of a novel CdTe-ZnO nanocomposite material as a spectral sensitizer component within a thin-film, hybrid heterojunction (HJ) PV device structure. Quantum-scale semiconductors have the potential to improve PV device performance through enhanced spectral absorption and photocarrier transport. This is realized via appropriate design of the semiconductor nanophase (providing tunable spectral absorption) and its spatial distribution within an electrically active matrix (providing long-range charge transport). Here, CdTe nanocrystals, embedded in an electrically active ZnO matrix, form a nanocomposite (NC) offering control of both spectral absorption and photocarrier transport behavior through the manipulation of nanophase assembly (ensemble effects). A sequential radio- frequency (RF) magnetron sputter deposition technique affords the control of semiconductor nanophase spatial distribution relative to the HJ plane in a hybrid, ZnO-P3HT test structure. Energy conversion performance (current density-voltage (J-V) and external quantum efficiency (EQE) response) was examined as a function of the location of the CdTe nanophase absorber region using both one dimensional solar cell capacitance simulator (SCAPS) and the experimental examination of analogous P3HT-ZnO based hybrid thin films. Enhancement in simulated EQE over a spectral range consistent with the absorption region of the CdTe nanophase (i.e. 400–475 nm) is confirmed in the experimental studies. Moreover, a trend of decreasing quantum efficiency in this spectral range with increasing separation between the CdTe nanophase region and the heterojunction plane is observed. The results are interpreted in terms of carrier scattering/recombination length mitigating the successful transport of carriers across the junction. The second portion of the research addresses the need for robust PV performance in commercial module as a primary contributor to cost-effective operation in both distributed systems and utility scale generation systems. The understanding of physical and chemical mechanisms resulting in the degradation of materials of construction used in PV modules is needed to understand the contribution of these processes to module integrity and performance loss with time under varied application environments. In this context, the second part of present study addresses microcracking in Si–an established degradation process contributing to PV module power loss. The study isolates microcrack propagation in single-crystal Si, and investigates the effect of local environment (temperature, humidity) on microcrack elongation under applied strains. An investigation of microindenter-induced crack evolution with independent variation of both temperature and vapor density was pursued in PV-grade Si wafers. Under static tensile strain conditions, an increase in sub-critical crack elongation with increasing atmospheric water content was observed. To provide further insight into the potential physical and chemical conditions at the microcrack tip, micro-Raman measurements were performed. Preliminary results confirm a spatial variation in the frequency of the primary Si vibrational resonance within the crack-tip region, associated with local stress state, whose magnitude is influenced by environmental conditions during the period of applied static strain. The experimental effort was paired with molecular dynamics (MD) investigations of microcrack evolution in single-crystal Si to furnish additional insight into mechanical contributions to crack elongation. The MD results demonstrate that crack-tip energetics and associated cracking crystal planes and morphology are intimately related to the crack and applied strain orientations with respect to the principal crystallographic axes. The resulting fracture surface energy and the stress-strain response of the Si under these conditions form the basis for preliminary micro-scale peridynamics (PD) simulations of microcrack development under constant applied strain. These efforts were integrated with the experimental results to further inform the mechanisms contributing to this important degradation mode in Si-based photovoltaics.
29
Haverinen, H. (Hanna). "Inkjet-printed quantum dot hybrid light-emitting devices—towards display applications". Doctoral thesis, University of Oulu, 2010. http://urn.fi/urn:isbn:9789514261275.
Testo completoAbstract (sommario):
Abstract
This thesis presents a novel method for fabricating quantum dot light-emitting devices (QDLEDs) based on colloidal inorganic light-emitting nanoparticles incorporated into an organic semiconductor matrix. CdSe core/ZnS shell nanoparticles were inkjet-printed in air and sandwiched between organic hole and electron transport layers to produce efficient photon-emissive media. The light-emitting devices fabricated here were tested as individual devices and integrated into a display setting, thus endorsing the capability of this method as a manufacturing approach for full-colour high-definition displays.
By choosing inkjet printing as a deposition method for quantum dots, several problems currently inevitable with alternative methods are addressed. First, inkjet printing promises simple patterning due to its drop-on-demand concept, thus overruling a need for complicated and laborious patterning methods. Secondly, manufacturing costs can be reduced significantly by introducing this prudent fabrication step for very expensive nanoparticles.
Since there are no prior demonstrations of inkjet printing of electroluminescent quantum dot devices in the literature, this work dives into the basics of inkjet printing of low-viscosity, relatively highly volatile quantum dot inks: piezo driver requirements, jetting parameters, fluid dynamics in the cartridge and on the surface, nanoparticle assembly in a wet droplet and packing of dots on the surface are main concerns in the experimental part. Device performance is likewise discussed and plays an important role in this thesis. Several compositional QDLED structures are described. In addition, different pixel geometries are discussed. The last part of this dissertation deals with the principles of QDLED displays and their basic components: RGB pixels and organic thin-film transistor (OTFT) drivers. Work related to transistors is intertwined with QDLED work; ideas for surface treatments that enhance nanoparticle packing are carried over from self-assembled monolayer (SAM) studies in the OTFT field. Moreover, all the work done in this thesis project was consolidated by one method, atomic force microscopy (AFM), which is discussed throughout the entire thesis.
30
Rodrigues, Cassy Anne dos Santos. "Quantas vezes devemos queimar o Cerrado? O efeito da frequência do fogo em comunidades vegetais de campo sujo de Cerrado /". Rio Claro, 2019. http://hdl.handle.net/11449/191448.
Testo completoAbstract (sommario):
Orientador: Alessandra Tomaselli FidelisResumo: O Cerrado é formado por fisionomias campestres e savânicas, evoluiu na presença do fogo e depende dele para manter suas fisionomias e biodiversidade. O regime de fogo influencia diretamente na montagem da comunidade vegetal, na regeneração e nas habilidades competitivas das plantas. A frequência é um dos fatores do regime de fogo e alterações nela podem ser prejudiciais até mesmo para plantas e comunidades adaptadas ao fogo. Portanto, este estudo busca compreender os efeitos de diferentes frequências de fogo em comunidades de campo sujo de Cerrado. Para isso, foram realizados levantamentos da vegetação e coleta de biomassa em áreas com diferentes históricos de fogo (excluído do fogo, queimadas anualmente e bienalmente), o que forneceu os dados de composição e produtividade da comunidade. Os levantamentos, incluindo a cobertura (%) por espécie, foram realizados em 10 subparcelas de 1x1m por tratamento (10 subparcelas/tratamento,3 tratamentos, 4 parcelas/tratamento). Avaliamos também através da taxa de propagação (m.s-1), eficiência de queima (%) e intensidade (kW.m-1) entre outros parâmetros do fogo, os efeitos de diferentes frequências no comportamento do fogo. Nossos resultados mostraram que a riqueza de espécies das comunidades vegetais foi maior nas áreas com frequência anual de fogo do que nas excluídas, 6 meses após o fogo e maior para as bienais do que as excluídas 12 meses após o fogo. O índice de diversidade foi maior no tratamento anual de queima antes e 12 meses apó... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: The Cerrado is formed by grasslands and savannah physiognomies, evolved in the presence of fire and depends on it to maintain its physiognomies and biodiversity. The fire regime influences the plant community assembly, the regeneration and the competitive abilities of the plants. Frequency is one of the factors of the fire regime and changes in it can be detrimental even to fire-adapted plants and communities. Therefore, this study aimed to understand the effects of different fire frequencies in campo sujo of Cerrado communities. For this, vegetation surveys and biomass collection were carried out in areas with different fire histories (excluded from fire, burned annually and biennially), which provided community composition and productivity data. Surveys, including coverage (%) by species, were performed on 10 1x1m subplots per treatment (10 subplots / treatment, 3 treatments, 4 plots / treatment). We also evaluated through propagation rate (m.s-1), firing efficiency (%) and intensity (kW.m-1) among other fire parameters, the effects of different frequencies on fire behavior. Our results showed that species richness of plant communities was higher in areas with annual fire frequency than in excluded areas 6 months after fire and higher for biennials than those excluded 12 months after fire. The diversity index was higher in the annual burn treatment before and 12 months after the burns. Regarding the number of species per functional group, only the forbs presented increase a... (Complete abstract click electronic access below)
Mestre
31
Barros, Ana Margarida Grácio de. "Determinantes ambientais de alguns padrões espaciais de fogo em regiões de tipo mediterrânico". Doctoral thesis, ISA, 2013. http://hdl.handle.net/10400.5/6445.
Testo completoAbstract (sommario):
Doutoramento em Engenharia Florestal e dos Recursos Naturais - Instituto Superior de AgronomiaFire provides a fundamental ecological function to many ecosystems. Nevertheless, in the past decades, the occurrence of very large, severe fires, has called for attention from managers, scientists and society in general. Understanding fire drivers constitutes an important step to identify regions of higher risk, establish priorities for protection, and manage the landscape to increase its fire resilience. The main goal of the present work is to explore relationships between fire, vegetation, topography and meteorology at landscape scale. It applies principal component analysis and circular statistics to determine the existence of spatial patterns in fire perimeter orientation, in two mediterranean climate regions, relying on a 31-year fire atlas for Portugal and 100-year fire atlas for California. Additionally it applies quantile regression to evaluate the relationship between fire size and fire selectivity towards different land cover types, in Portugal. The results presented here reinforce the importance of meteorological conditions as the primary driver of fire spread, at landscape scale and in the regions considered.
32
Klemsa, David. "Detailní projektování technologického pracoviště ve firmě ADOZ, s.r.o". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-382280.
Testo completoAbstract (sommario):
This master's thesis focuses on the manufacturing system of the company ADOZ, ltd. It describes some systems of production management that leaders of the company want to implement, the company itself, the condition of the default manufacturing system, its deficiencies and motives of the company that led leaders to decide to move to a new space. One section of the thesis describes the space of the new building into which the company wants to move its manufacturing system. The thesis also deals with the calculation of capacity, the quantity of staff, and the size of the areas of the new manufacturing system that should be placed into the new building. The workplaces of the manufacturing system have been divided into various type groups. The relationships between these groups have been analysed, whereupon accurate plans of the placement of workplaces of the new manufacturing system in the manufacturing space of the new building have been created. On the basis of two different attitudes towards calculation of capacity, two different proposals have been created, and a plan of workplace placement has been made individually for each proposal. Both proposals have been compared from a financial viewpoint.
33
Oliveira, Joao. "Export marketing adaptation and export performance". Thesis, Loughborough University, 2015. https://dspace.lboro.ac.uk/2134/17457.
Testo completoAbstract (sommario):
Identifying the antecedents of export performance is critical for researchers, due to the many benefits of exporting for firms and nations. Many researchers have, thus, devoted their research efforts to identifying export performance antecedents. Export marketing adaptation and firm level export market orientation (or EMO) have emerged as two critical export performance predictors. However, two important research questions remain unexamined. The first is whether firms ought to pursue heterogeneous levels of marketing adaptation across ventures in order to boost venture performance, and whether the answer to this question is contingent upon internal firm resources which support adaptation (namely EMO) and upon the environments faced across ventures. The second question concerns what the total amount (i.e. quantity) of export marketing adaptation firms should undertake in order to boost firm export performance is, and whether the answer to this question depends on internal firm resources supporting adaptation (more specifically, EMO) and on the overall export environments faced by firms. Underpinned by a contingent approach to the study of business performance, this study set out to answer to such questions, via developing and testing two conceptual models. The models were tested using data collected from British exporting companies. The findings of the first model indicate that marketing adaptation across ventures becomes increasingly beneficial for venture performance (directly in the case of sales performance and indirectly in the case of profit performance) as EMO rises and as the levels of environmental differences across ventures increase. Results of the second model suggest that, under greater levels of EMO, firm export sales performance attains its highest values when the firm practices either very low or very high levels of marketing adaptation quantity. Also, under greater levels of EMO, firm export sales performance is increasingly reduced the more the firm deviates from extreme (low/high) marketing adaptation quantities. Additionally, as the firm s export environments become more heterogeneous, the firm benefits increasingly more from pursuing either very low or very high marketing adaptation quantity levels (with sales performance being maximized when the firm pursues very high levels of marketing adaptation quantity), and the reductions in firm export sales performance accruing from undertaking intermediate marleting adaptation quantity levels are increasingly higher. Findings also suggest that enhancing marketing adaptation quantity is beneficial for firm export profit performance up to an optimal point. The returns brought by additional increments in marketing adaptation quantity are increasingly smaller as marketing adaptation quantity increases. Beyond an optimal point, additional increments in marketing adaptation quantity diminish firm export profit performance. The marketing adaptation quantity-firm export profit performance link was not found to be moderated directly neither by EMO nor by firm export environmental differences. EMO was found to have a positive impact on firm export sales and profit performance.
34
Landmann, Tobias. "A case study for Skukuza : estimating biophysical poperties of fires using EOS-MODIS satellite data ; a field and remote sensing study to quantify burnt area and fire effects in South African semi-arid savannas /". Aachen : Shaker-Verl, 2004. http://www.loc.gov/catdir/toc/fy0708/2006485603.html.
Testo completo
35
Landmann, Tobias. "A case study for Skukuza : estimating biophysical properties of fires using EOS-MODIS satellite data : a field and remote sensing study to quantify burnt area and fire effects in South African semi-arid savannas /". Aachen : Shaker, 2004. http://www.loc.gov/catdir/toc/fy0708/2006485603.html.
Testo completo
36
Pal, Singh Amrit [Verfasser], e Roman [Akademischer Betreuer] Schnabel. "Intensity-dependent phase shifts in optical materials for quantum state preparation and absorption measurements in thin film coatings and bulk material / Amrit Pal Singh ; Betreuer: Roman Schnabel". Hamburg : Staats- und Universitätsbibliothek Hamburg, 2018. http://d-nb.info/1161530266/34.
Testo completo
37
Göhring, HOLGER [Verfasser], Metin [Akademischer Betreuer] Tolan e Manfred [Gutachter] Bayer. "Structural investigation of the impact of magnetostriction on GaMnAs thin film lattices and the thermal expansion of (In,Ga)As/GaAs quantum dots / Holger Göhring ; Gutachter: Manfred Bayer ; Betreuer: Metin Tolan". Dortmund : Universitätsbibliothek Dortmund, 2017. http://d-nb.info/1136785256/34.
Testo completo
38
Lin, Yuh Chwen, e 林鈺淳. "Firm''s Risk Management and Quantity Analysis". Thesis, 1995. http://ndltd.ncl.edu.tw/handle/10221396491702808358.
Testo completo
39
Yen, Wan-Chen, e 嚴婉禎. "Firm Size and Survival Duration - An Application of Censored Quantile Regression". Thesis, 2007. http://ndltd.ncl.edu.tw/handle/51493507436446998075.
Testo completoAbstract (sommario):
碩士中原大學
國際貿易研究所
95
The relationship between firm initial size and survival is different within some industrial studies. Some studies indicate that they are not related, some studies reveal that they are positively or negatively correlated. In addition, some empirical studies analyze the relationship between performance and firm size of listed firm. The outcomes are also discordant. We think the controversy is the result of lack of duration effect. Firms usually enter with small size and we usually expect survival duration of them is short (Geroski, 1995). Furthermore, a lot of empirical works find that small firms usually have shorter survival duration. Besides, Jovanovic (1982) conclude that efficient firms would grow and survive, but it would take time to find their efficiency. However, if survival duration is not long enough, the effect of experience will not work. Therefore we infer that, in the short survival duration, size does matter. But in the lung survival duration, because of the effect of experience or learning effect, size is not that important. Due to the limitation in data availability, we use listed firms of electronic industry in Taiwan, from January in 1988 to April in 2007. We use offering stock volume as size proxy. We imply censored quantile regression to observe whether the relationship between firm size and survival duration change, and compare the outcome with Cox proportional hazard model. The results from CQR indicate that the effects of firm size are changed. Firm size and survival are correlated in the law quantiles, but are uncorrelated in the high quantiles. As far as firms with long survival duration concerned size does not affect. However, firms who live short, firm size is concerned. In the short duration, they are positively correlated. The result is consistent with many findings. Large firms are easy to survive. In addition to size, results in square term of size, age at offering and offering activity reveals effects are changed in different quantils. However, the results from CPH are not significant, because CPH is in the mean conditional. If we use CPH as analysis tool, the real effect may be averaged and we could not see the changes of size effect.
40
Chien, Feng-Ping, e 錢鳳屏. "Corporate Social Responsibility and Firm Performance: An Application of Quantile Regression". Thesis, 2013. http://ndltd.ncl.edu.tw/handle/38512539588236287555.
Testo completoAbstract (sommario):
碩士國立高雄應用科技大學
國際企業研究所
101
A firm’s fulfilling its corporate social responsibility (CSR) has become a new competitive advantage of a firm. This study explores how the fulfillment of CSR would impact the firm performance based on the CSR framework of stakeholder and the analysis of quantile regression. Contrast to the earlier CSR framework comprising only of economic, social, and environmental dimensions, we include the fourth dimension, corporate governance, to evaluate a firm’s CSR contributions to stakeholders. Our results find that CSR has a positive impact on firm performance. Moreover, the result of quantile regression indicates that the impact of CSR would change with the quantile of the dependent variables, indicating a positive, non-linear relationship between CSR and firm performance.
41
Wang, Yen-Hsiu, e 汪顏秀. "The effects of R&D expenditure、IFRS enforcement and firm-specific characteristics on firm performance: A quantile regression approach". Thesis, 2017. http://ndltd.ncl.edu.tw/handle/bt3un6.
Testo completoAbstract (sommario):
碩士國立臺中科技大學
會計資訊系碩士班
105
In response to an increasing demand for transparent and comparable financial statements, the globalization of corporation, and the attraction of foreign capitals investment, the improvement of firms’ competitions, Taiwan Supervisory Commission imposed the introduction of IFRS for all listed firms in 2012 to improve accounting information quality. Using quantile regressions, this study explores the impacts of research and development expenditures (R&D), IFRS enforcement, and firm characteristics on firm performance. There are 10,722 observations of both four-years-period before (2008-2011) and after (2012-2015) IFRS enforcement in this study. To realize the lags effects of the research factors, the performance is lagged by one to three periods. In many cases, quantile regression estimates are quite different from those of OLS regressions. The results show that R&D positively (negatively) influences good (bad) performance firms. The enforcement of IFRS turns performance from negative to positive in the long run. For the highly-performance companies larger in size worse their performance. Firm history decreases performance if the performance is 25 percent above companies. Book-to-market and leverage ratio saliently damage performance. Last year net loss determines the bad performance following years.
42
Yang, Jia-Rung, e 楊佳蓉. "The Impacts of Exchange Rate Volatility on Firm Valuation- Quantile Regression Analysis". Thesis, 2009. http://ndltd.ncl.edu.tw/handle/70704182284021481714.
Testo completoAbstract (sommario):
碩士國立高雄第一科技大學
財務管理所
97
Exchange rate exposure is defined as exchange rate movements affect the value of firms. Many financial literatures and models indicate that exchange rate fluctuations have a significant impact on firm value, regardless of whether the firm is domestically or internationally oriented. In contrast to theoretical fundations, numerous empirical results show a low proportion of companies are significantly exposed to exchange rate risk. Following papers make effort try to solve this dilemma; however, they still get weak relationships between exchange rates and firm value. In order to improve exchange rate exposure significant ratio, we adapt “Quantile Regression” to study exchange rate exposure in this paper. According to sales exporting ratio and industry classification, we divide our samples into: (i) internal-sale firms and external-sale firms, and (ii) a variety of industries. Empirical findings show that significant proportion obviously increases in quantile 0.1 and quantile 0.9. Quantile regression method exceeds traditional OLS way enormously in detecting exchange rate exposure. The significant figures even rise to a fifty per cent. This indicates sample character is not vital reason resulting in low level of significant ratio and economic exchange exposure is important for firms. This paper also discovers some phenomena: different degree of stock return has different exchange rate risk no matter risk direction or risk size. In risk direction, exchange change movement incurs contrary direction; in risk size, it seems to appear there is much more exchange rate exposure in bull market in external-sale firms .
43
Lin, Hung-Yuan, e 林鴻源. "Laser Deposition ZnSe Quantum dot Glass Thin Film". Thesis, 1996. http://ndltd.ncl.edu.tw/handle/95702695329813831774.
Testo completoAbstract (sommario):
碩士國立交通大學
光電工程研究所
84
ZnSe doped glasses thin films were deposited on silicon and substrate by using of Q-switched Nd:YAG laser, and the targert were prepared by sol-gel methed of colloid chemical technique. From the SEM, we can realize the fine structure of the ZnSe thin film surface and estimate the grain size about 200 A. By changing the deposition condition, we obtain a single crystallite of ZnSe thin film which is identified to be H(002) or C(111) by XRD, and the grain sizecaculation through Half Maximum of XRD peak tch the result of SEM. In the Raman spetra, we make sure the ZnSe bond, and the peak show that the phonon frequency shift to lower side for grain size becaming smaller. The energy gap of ZnSe film is acquired by the Transmission spectra has the phenomonon of blue shift, and this result is corresponding with the prediction of Quantum dot effect.
44
Chen, Ai-Lin, e 陳艾琳. "Analyzing the Link Between Real Exchange Rate and Firm Performance by Quantile Regression". Thesis, 2012. http://ndltd.ncl.edu.tw/handle/34247581861079024032.
Testo completoAbstract (sommario):
碩士銘傳大學
國際企業學系碩士班
100
In this paper, we discuss the effect of industry real exchange rate on the firm performance by quantile regression. Firstly, we calculate the industry real exchange rate from 1991 to 2010. The industries are food, plastics, rubber, textile, non-metal, metal, machinery and electronics. Secondly, we use quantile regression to analyze publicly traded companies data in these industries in each year. Our findings indicate that industry real exchange rate affect firm performance significantly in 90% quantile, especially for the electronics.
45
Heredia, Elica A., e 何麗安. "Quantum phenomena of thin-film transistors at cryogenic temperatures". Thesis, 2017. http://ndltd.ncl.edu.tw/handle/p7a9jj.
Testo completoAbstract (sommario):
碩士國立臺灣師範大學
物理學系
106
This experiment focuses on the competition of weak localization (WL) and weak antilocalization (WAL) on a single gate and dual gate a-IGZO, these quantum interference effects on systems have been studied on a dual gate a-IGZO by varying the gate voltages (top gate and bottom gate), on the other hand, temperature and gate voltage were varied on a single gate a-IGZO to observe the competition between WL and WAL. The universal dependence of conductivity was partially unveiled on single gate a-IGZO and the full profile of this intriguing universal dependence was shown on the dual gate a-IGZO. It is speculated that the prefactor for WL (α0) and prefactor for WAL (α1) are determined by the ratio of the gap opening at the Dirac point to the fermi energy level, which can be manipulated via electric gating. This work hopes to help build a theoretical model and attract theoretical contributions that should be a great advantage in future applications in nanoelectronics and spintronics.
46
Huang, Shung-Cheng, e 黃順誠. "Growth of One Monolayer of PbSe Quantum-dot Thin Film". Thesis, 2005. http://ndltd.ncl.edu.tw/handle/51762082076791828945.
Testo completoAbstract (sommario):
碩士國立中興大學
物理學系
94
In this thesis, we research for the growth of one monolayer of PbSe quantum-dot thin film. The PbSe spherical quantum dots(SQD) were dispersed in toluene solution and kept the solution in proportionate concentration. Subsequently, deposited a drop of solution onto a fresh surface at different temperatures. We found the growths of one monolayer of PbSe quantum-dot thin film have different morphology. At room temperature, the PbSe SQD islands reveal dendritic fashion. As we raise the temperature of substrate above 100℃ for deposition, the PbSe SQD islands become rounded and the surface also become more flat. Consequently, we observed the the superlattice structure is hexagonal closed-packed(HCP). We have studie the growth behavior by using atomic force microscope. The PbSe SQD starts to nucleate, and finally grow films. The thickness of the PbSe SQD monolayer is 10~11nm.
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Ching-KangChen e 陳敬岡. "Investigation of Albumen Thin Film Transistor Memories Using Quantum Dots". Thesis, 2013. http://ndltd.ncl.edu.tw/handle/13706900433436741096.
Testo completoAbstract (sommario):
碩士國立成功大學
微電子工程研究所碩博士班
101
The main purpose of this thesis was focused on the deposition of quantum dots (QDs) thin film in organic memory thin film transistors by microcontact printing technique. In the study of organic thin film transistors, the transfer contact printing method could effectively prevent the destruction of thin film from organic solvent. Besides, contact printing technique has the advantage of thin film patterning. Therefore, the number of leakage current paths could be effectively reduced by the application of contact printing technique in the fabricated procedures. In this study, we used polydimethylsiloxane (PDMS) to be the stamps. After spin coating the QDs on the PDMS stamp, the QDs were then transferred onto the dielectric layer subsequently. The QDs can be used as floating gate of the devices. Floating gate partially offset the internal electric field which inducing the shift of threshold voltage. The shift of threshold voltage accomplished memory effect. In the study of QDs’ application for transistor-type memory, the basic structure was n+ - Si (gate electrode)/SiO2 (dielectric layer)/poly(methyl methacrylate) (PMMA) (adhesion layer)/quantum dots (floating gate)/pentacene (channel layer)/gold (source and drain layer). The floating gate of conventional devices was fabricated by spin coating the QD-PMMA composite on the SiO2 thin film. Compared with spin coating method, using the PDMS stamp can also successfully transfer QDs onto PMMA layer. The QDs were playing in an important role to capture the carrier charges in the transistor device. The device showed typical transistor characteristics under electrical operation. Under hysteresis testing, the memory window could increase from 25 V with spin coating method to 74.3 V using contact printing technique. And the switching property exhibited over 100 write-read-erase-read cycles. Furthermore, the retention time achieved more than 32 years (109 seconds). In study of albumen based thin film transistors and memory transistors, the dielectric material was changed to be albumen which is friendly to our environment. The first half of experiment was spin-coating above the surface of chicken albumen thin film with water for changing surface free energy. After increasing the surface free energy of albumen thin film to match with that of active layer (pentacene film), the quality of pentacene crystal was markedly improved. Because the crystal quality of pentacene layer can directly affect performance of transistor, the yield rate could increase from 12.5% to 80% after water treatment. In last half of experiment, the contact printing method was used to fabricate quantum dots. Under Atomic Force Microscopy (AFM) measurements, the surface roughness of albumen film with spin coating method was 3.48 nm and could reduce to 2.48 nm by applying contact printing technique. Furthermore, the surface of chicken albumen thin film was treated by spin coating water for preventing the damage from toluene and efficiently reducing surface roughness. The surface roughness of albumen film could reach 1.47 nm with water protection. After transferring QDs onto albumen film, the transistor-type memory purpose was realized. In this device testing, the memory window was 50.33 V. But the switching property and stability of memory thin film transistors still have room to be improved.
48
Maria, Ahmed. "Improving the photoluminescence quantum efficiency of size-tunable, solution-processed lead-sulfide quantum dots in film". 2004. http://link.library.utoronto.ca/eir/EIRdetail.cfm?Resources__ID=95027&T=F.
Testo completo
49
Chang, Wan-Fang, e 張婉芳. "A Study on Firm size, Financial Dependence, Financial Development and Economic Growth : A Quantile Regression Approach". Thesis, 2006. http://ndltd.ncl.edu.tw/handle/26e3gr.
Testo completoAbstract (sommario):
碩士淡江大學
經濟學系碩士班
94
This paper explores the relationship among economic growth, financial development, and financial structure, using quantile approach. Applying cross-sectional data on 77 countries over 1990-2003 periods, I find that： 1. For countries with low and medium economics growth rates, the improvement of financial market facilitates economic growth. Both financial development and financial structure have no significant effect on economic growth in the countries with high economic growth. 2. For countries with low economic growth rates, the greater the external dependence, the stronger the positive effect of financial market development on long-term economic growth. Both financial development and financial structure show ambiguous effects on economic growth in the countries with medium economic growth rate. While financial development and financial structure are not significantly related to economic growth for the countries with high economic growth rates. 3. For the countries with low and medium economics growth rates, the more the country toward medium and small firm size, the stronger the positive effect of financial market development on long-term economic growth. Both financial development and financial structure are not significantly related to economic growth in countries with high economic growth rates. 4. For the countries with low and medium economics growth rates, the more the country toward medium and small firm size, the higher accounting standards may harm economic growth. For the countries with high economics growth rates, account standards are not significantly related to economic growth.
50
Din, Hong-Ren, e 丁虹仁. "Location and Quantity competition in a Spatial Model with unequal firms". Thesis, 2006. http://ndltd.ncl.edu.tw/handle/38266351236261568900.
Testo completoAbstract (sommario):
碩士華梵大學
工業工程與經營資訊學系碩士班
94
This research analyzes a linear (circular) market where two cooperative firms compete with a single firm at each point in space. In the location-quantity game, each firm choices their locations simultaneously and then choices their product quantity according to the observations of all players’ choices in the previous stage, which so as to maximize its profit. The main conclusion are as follows: (1). Regardless of product is substitute or complement, the single rival will locate at the center of the linear city. (2). Regardless of product is substitute or complement, if any one of the three firm’s location is given in zero, then the optimal location of the cooperative firms will locate equidistant from the single rival firm on the circle. (3). An increase (decrease) in the transportation costs will make the cooperative firms move away from (close to) the rival in the linear (circular) market when firm’s product is substitute or complement.