Дисертації з теми "LED heat management"
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Pryde, James R. "Development of effective thermal management strategies for LED luminaires." Thesis, Loughborough University, 2017. https://dspace.lboro.ac.uk/2134/26687.
Повний текст джерелаHa, Min Seok. "Thermal analysis of high power led arrays." Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/31803.
Повний текст джерелаCommittee Chair: Samuel Graham; Committee Member: J. Rhett Mayor; Committee Member: Yogendra Joshi. Part of the SMARTech Electronic Thesis and Dissertation Collection.
Sedlář, Tomáš. "Simulace odvodu tepla výkonového prvku do okolí." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2016. http://www.nusl.cz/ntk/nusl-242159.
Повний текст джерелаRaut, Rahul. "Thermal management of heat sensitive components in Pb-free assembly." Diss., Online access via UMI:, 2005.
Знайти повний текст джерела李雯靜 and Man-ching Anney Lee. "Effects of the disease management programme with nurse-led heart failure clinic." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2008. http://hub.hku.hk/bib/B40721036.
Повний текст джерелаLee, Man-ching Anney. "Effects of the disease management programme with nurse-led heart failure clinic." Click to view the E-thesis via HKUTO, 2008. http://sunzi.lib.hku.hk/hkuto/record/B40721036.
Повний текст джерелаLioupras, Ioannis, and Eleni Manthou. "Don’t let my Heart bleed! : An event study methodology in Heartbleed vulnerability case." Thesis, Umeå universitet, Institutionen för informatik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-90126.
Повний текст джерелаDujardin, Pierre-Philippe. "La conduite de projets ordinaires pilotée par les cadres de santé." Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAS018.
Повний текст джерелаLiterature describes hospital organisation as complex and compartmentalised. It identifies the head nurse (HN) as a pivot to translate and articulate various professional logics. Her function is usually described by their daily operational work of coordination to the detriment of a job destined to structure and improve organisation.By focusing on project management, the aim of this thesis is to identify the work of organisational coordination carried by the HN.It leans on an educational device which puts student executives in the position of a third party to explore an organisational problem delegated by a HN. After the restitution to the HN produced by a third party, research intervention has followed the implantation of 17 projects over one year.The thesis is organised around four published articles: the first one prones the benefits and limits of the third party intervention. The second presents two methods to use the third party production, revealing the link between the project, the HN and the team. The third article explores the conditions of project management carried by the HN in three relational dimensions: in relation to the medical team, in cross section with other units of care, and at institutional level with the administrative and hierarchical actors. The fourth defines, among 12 variables, the factors which influence the result of the implemented action plan.The results show that the third party allowed to re-configure the collective relations in the unit of care and relaunched the HN in his power to act. The success of the project was more frequent when it was presented to the team and discussed in meetings, that is, when the HN helped regulate debates and be referee. On the contrary, when the HN waited for institutional support, or when the project management was prescriptive, without formal communication with the nursing staff, failure was more frequent. In summary, 71 % of the actions encountered resulted in an operational improvement.The research shows that the attributes of methods and social are not all identified in the project management carried by the HN. The results permit to consider the work of coordination produced by the HN as « ordinary Project ».Recommendations are formulated. At an institutional level, it is suggested to identify a unit managerial support. The proposals underline the importance of giving visibility to the ordinary project and necessity to develop spaces of discussion. Activities of initial and continuous training are identified to accompany the future HN and the HN in their managerial practices
Corones, Watkins Katina Marlene. "A randomised controlled clinical trial of a post-discharge, nurse-led educational intervention to reduce anxiety and enhance self-efficacy in percutaneous coronary intervention (PCI) patients within the first week post-discharge: A pilot study." Thesis, Queensland University of Technology, 2016. https://eprints.qut.edu.au/93369/1/Katina_Corones-Watkins_Thesis.pdf.
Повний текст джерелаBerggren, Josefine, and Elin Jakobsson. "“Vi leder på ett helt annat sätt än man någonsin har gjort förut” : En studie om chefers upplevelse av att leda i krissituationer inom detaljhandeln." Thesis, Uppsala universitet, Institutionen för pedagogik, didaktik och utbildningsstudier, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-414044.
Повний текст джерелаThe aim of this study is to contribute with knowledge about how managers experience leadership in crisis. The study approaches the purpose by asking the following questions: How do managers experience that their leadership changes in crisis? What challenges and problems arise in crisis? What type of strategies do managers use to meet the challenges and problems that arise in crisis? The study is referring to the crisis caused by the Covid-19 pandemic in 2020, however our ambition is that the result should also be applicable to other types of crises. The study is conducted with a qualitative approach where semi-structured interviews are used as a method for data collection. The material has been analyzed through a thematic analysis based on the theoretical framework of the study; Situational leadership II. Historically, leadership has been a well-researched area with considerable variation in both approaches and phenomena. Our study aims to explore leadership in crisis and how this is experienced by those who practice it, which is part of the field that seems to be fairly unexplored. What has been established in earlier studies is that leadership play a crucial role in crisis. Our result shows that the managers were forced to change their leadership as a consequence of the crisis, and they mainly use a directing leadership style. The experience of this change differs among the managers, where some feel that the crisis has challenged them in a fun way and others feel that the leadership is now completely different from how they want to lead. Among the leaders who think the crisis has been partially fun we can identify a conflict when it comes to which leader they express they want to be and which leader they feel satisfaction of being. The leaders tend to use different types of strategies to face the challenges as a consequence of the crisis, the most common one seems to be communication. The study also states that many educational processes have suffered during the crisis, as a consequence of the leaders not being able to adapt their leadership to meet the individual needs of their followers.
Prieto, herrera Rafael. "Développement d'une solution de répartition de la chaleur émise par les points chauds en co-intégration avec les technologies CMOS." Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAT113/document.
Повний текст джерелаWe witness today an explosion of nomadic technologies. Portable devices have become the main tool that people use to connect with the rest of the world. The microelectronics embedded in these devices is the technology that drives this process. The pace of development of these technologies is such that the versatility of portable devices today were science fiction only 10 years ago.The functionalities that will be integrated in the coming years cannot be imagined yet. These features will imply an increase of the computing demands, and consequently, of the heat dissipated inside them. The trend leads to complex stacks with heterogeneous modules of heat dissipating layers.These technologies will be integrated in everyday life. Internet of Things, as we call it, will demand an increasing amount of independent low footprint devices that will be connected. Heat dissipation strategies must therefore be compatible with increasingly smaller dimensions. Compact packages demand is growing rapidly, not only because of telephones and tablets, but also because of the massive introduction of electronics into in everyday life devices.The objective of the thesis is to study the integration of heat-spreaders in compact packages to enhance its thermal performance. This work goes deeply in the characterization of the thermal performance of carbon-base heat spreaders. Heat-spreaders are able to extract the heat produced in hot spots and transport it along its surface.In order to study the heat spreading phenomenon, a methodology that takes into account the multi-level nature of heat dissipation has been implemented. The objective is to be able to focus on the interaction between the heat-spreader and each one of the elements of the package stack. Two test vehicles have been re-used from previous works. A specific test vehicle was also design in order to emulate the thermal behavior of imaging sensors.The thesis is based on two main axes: Integration studies and thermal studies. The integration studies take into account the constraints derived from the implementation of heat spreaders in compact packages. Firstly, we focus on the implementation processes within an industrial process. Latelly, we study the thermomechanical effects of heat spreaders and the impact on the integrity of high frequency signals.Thermal studies are aimed to characterize the performance gain derived from this heat spreader integration. The thermal phenomena are analyzed with measurements and simulations. First at silicon and interface level, then at package level, finally we focus on the effects in image sensor die and package.In the light of the results it can be said that carbon based materials are the most interesting alternative for large-scale implementation of heat spreaders in compact packages. This implementation will be driven by the research of new functionalities and performances in compact packages. The heat spreader will have to perform while maintaining a minimal footprint. The combination of carbon layers at all package levels, along with reduced thermal interface thickness will be the trend in the coming years for this type of device.This thesis is part of a tripartite collaboration between the CEA-LETI of Grenoble, the G2Elab laboratory of the INP Grenoble and STMicroelectronics in Crolles
Vuillecard, Cyril. "Méthode de construction d’une offre d’effacement électrique basée sur les technologies gaz naturel : Application - micro-cogénération et chaudière hybride." Thesis, Paris, ENMP, 2013. http://www.theses.fr/2013ENMP0008/document.
Повний текст джерелаThis PhD thesis addresses two issues: Firstly, the assessment of Demand Side Management (DSM) opportunity of gas and electricity technologies in dwellings, and secondly, the integration of their valuations in infrastructure planning schemes.This work originaites from a context of the growth of electricity peaks (which increased risk of system failure) and the natural gas consumption decrease which leads to an under-utilization of the gas distribution network.This manuscript focuses on the integration of gas technologies as DSM solution to contribute to the planning of electricity grid. Indeed, relieving the electricity consumption during constrained periods by diffusing micro-cogeneration or hybrid boiler, is an actual alternative to network reinforcement solutions. To quantify the load shedding capacity, we are interested in the marginal impact of demand systems on the amount of Energy Not Supplied potential. Estimating systems' impacts on heating demand is a prerequisite to this approach. So we model the regional heating load curves by a Bottom-Up approach to simulate marginal demand profiles depending on heating systems. The implementation of this method requires socio-technico-economic studies to reduce uncertainty of the determinants of heating needs. A load calibration methodology has been proposed but has not been performed. However, we make a contribution to the analysis of aggregated load curves emphasizing that the load model currently used by network operator similar to a simplified building model
Hémery, Charles-Victor. "Etudes des phénomènes thermiques dans les batteries Li-ion." Phd thesis, Université de Grenoble, 2013. http://tel.archives-ouvertes.fr/tel-00968666.
Повний текст джерелаRouchier, Simon. "Hygorthermal performance assessment of damaged building materials." Phd thesis, Université Claude Bernard - Lyon I, 2012. http://tel.archives-ouvertes.fr/tel-00980172.
Повний текст джерелаAlvin, Christian, and 廖文華. "A Study on the Thermal Management of an LED Lamp Using Fin Heat Sinks." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/13543706072764893319.
Повний текст джерела中原大學
機械工程研究所
100
Abstract High LED operational temperature should be considered. High power LED could generate more heat. Approximately 70-85% LED power is converted into heat. This high operating temperature of LED should be lowered, since high operating temperature will lead to reductions of the luminosity and the lifespan of LED. Many cooling system is used to dissipate heat from LED lamp. Most of the heat dissipation methods is using natural convection; by adding more areas to contact with the lower environment temperature. One effective way to increase the contact areas are by attached a heat sink to the heat source. Heat sink is easy to manufacture, relatively low in cost, light in weight, and can become an adequate cooling means with good reliability In this study, 10 Watt of LED lamp was used as a heat source for studying the effectiveness of extruded fin heat sink. The effectiveness was measured by the thermal resistance value between the LED and the heat sink. Lower thermal resistance value is needed for higher heat dissipation capability. Through the experiments, the effects of heat sink material, thermal interface material and heat sink mounting pressure on the thermal resistance value of the LED lamp system were investigated. Using statistical software Minitab 15, the significance of each factor can be determined. From this study it was shown that the thermal resistance was dominantly influenced by the heat sink mounting pressure, followed by the thermal interface materials and heat sink materials. Moreover, the effect of heat spreader to the heat sink resistance value was also investigated. Three types of heat spreader used in this study were: vapor chamber, copper block and aluminum block. Each of these heat spreaders was attached between the LED and extruded fin heat sink. The results show that vapor chamber is proven to be the most efficient heat spreader. Adding vapor chamber was increasing the heat sink heat dissipation performance, measured by having the lowest resistance value compared with using other types of heat spreader. Numerical simulations of ANSYS ICEPAK 12.1 were built to analyze the thermo-fluidic behavior of the LED lamp system and to visualize the temperature distribution of the system. It was found that the results obtained from numerical simulations were in good agreement with those obtained from the experimental data, with a percentage difference of equal or less than 10%. ANSYS ICEPAK 12.1 is also proven to be a suitable software for electronic cooling simulations.
Coelho, Henrique José Rosa Silva Sintra. "The impact of specialised care on treatment and management of the venous leg ulcer : time to heal, cost to heal and quality of life." Master's thesis, 2021. http://hdl.handle.net/10451/52164.
Повний текст джерелаAs úlceras venosas são uma patologia com impacto significativo na qualidade de vida dos doentes e nos custos inerentes aos sistemas de saúde. Apesar da evidência científica apontar um claro benefício no tratamento destes doentes com terapia compressiva e em centros especializados a nível nacional, estes doentes são atualmente dispersos por várias especialidades. Com este estudo, pretendeu-se avaliar o impacto da abordagem destes doentes em consulta especializada em feridas crónicas no custo de tratamento, tempo necessário para encerramento da úlcera e impacto na qualidade de vida. Neste sentido, realizou-se um estudo retrospetivo descritivo com base na população de doentes seguidos numa consulta de feridas complexas num período de 2 anos, avaliando-se impacto da úlcera na qualidade de vida, gasto com os cuidados de penso, tempo até encerramento da ferida e tipos de tratamentos realizados. A análise dos dados dos 89 doentes identificou uma diferença significativa relativamente ao custo de tratamento, duração da ferida e qualidade de vida dos doentes quando o tratamento é feito por uma equipa especializada, corroborando as vantagens deste tipo de seguimento e tratamento descritos na evidência cientifica já existente.
Venous leg ulcers are a pathology with significant impact on patients’ quality of life as well as having high costs to the national health systems. Regardless of the evidence stating the benefits of this patients being treated on specialised centres with compressive therapy, this patients are currently spread out throughout many different specialties with lack of evidence-based care. With this study we aimed to evaluate the impact of a specialised consult, directed to chronic wound care, in hospital setting, on the time to heal, the cost of treatment and the impact on quality of life on patients with venous leg ulcer. A retrospective descriptive study was designed with a patient data base from a specialised chronic wound consult in a 2-year period, evaluating ulcer impact on quality of life, costs with management and treatment, time to heal and types of compressive therapy used. After analysing the data regarding 89 patients’ VLUs, we concluded that specialised chronic wound consult and compressive therapy have a significant impact on the management and treatment of the venous leg ulcer, with significantly lower times needed to heal, costs to heal and with ta significant improvement on patients’ quality of life.
Lessard, Justine. "Validation externe des critères de gravité du saignement intracrânien chez les patients avec un traumatisme crâniocérébral léger." Thesis, 2021. http://hdl.handle.net/1866/25666.
Повний текст джерелаBackground: There is variability in the management of patients presenting to the emergency department (ED) with mild traumatic brain injury (MTBI) and abnormal findings on their initial head computed tomography (CT). The main objective of this study was to validate the value of the Important Brain Injury (IBI) criteria, introduced by the Canadian CT-Head Rule, in predicting the need for surgical intervention. The secondary objective was to evaluate the usefulness of IBI criteria to predict admission to a tertiary care hospital. Methods: This is a post hoc analysis of a prospective cohort of adult patients presenting to the ED of one tertiary care, academic center, between 2008 and 2012, with MTBI and an abnormal initial head CT. Neurosurgical intervention and tertiary center admission were at the discretion of the treating physician. The sensitivity and specificity of the IBI criteria were calculated with their 95% confidence intervals (95%CI). Results: A total of 678 patients (male = 65.9%, mean age = 62.5 years) were included, of whom 114 (16.8%) required neurosurgical intervention. All patients requiring neurosurgical intervention met IBI criteria on their initial head CT (sensitivity of 100% [95%CI 96.8-100]). However, only 196 (28.9%) patients who did not require neurosurgical intervention were correctly identified using these criteria (specificity of 34.8% [95%CI 30.8-38.8]). The IBI criteria had sensitivity of 78.3% (CI 74.6-81.7) and specificity of 55.9% (CI 47.4-64.2) to predict admission to a tertiary care center. Conclusion: The IBI criteria for MTBI identified all patients who required neurosurgical intervention, but did not show a high specificity. They were less sensitive, but more specific, in predicting admission to a tertiary care center.
Pilon, Jasmin. "Gestion des attentes et cadrage chez les entraîneurs de la LNH : la saison 2016-2017 des Canadiens de Montréal." Thèse, 2018. http://hdl.handle.net/1866/21961.
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