Dissertations / Theses on the topic 'Efficiency coefficient'
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Rizzo, Giuseppe, Antonino Bonanno, Giorgio Paolo Massarotti, Luca Pastorello, Mariarosa Raimondo, Federico Veronesi, and Magda Blosi. "Energy efficiency improvement by the application of nanostructured coatings on axial piston pump slippers." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-200187.
Full textBubnova, Olga. "Thermoelectric properties of conducting polymers." Doctoral thesis, Linköpings universitet, Fysik och elektroteknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-87476.
Full textJoseph, Jyothis. "Improving Photovoltaic Panel Efficiency by Cooling Water Circulation." Thesis, University of North Texas, 2018. https://digital.library.unt.edu/ark:/67531/metadc1404617/.
Full textShen, Sumin. "Contributions to Structured Variable Selection Towards Enhancing Model Interpretation and Computation Efficiency." Diss., Virginia Tech, 2020. http://hdl.handle.net/10919/96767.
Full textDoctor of Philosophy
The advances in data-collecting technologies provides great opportunities to access large sample-size data sets with high dimensionality. Variable selection is an important procedure to extract useful knowledge from such complex data. While in many real-data applications, appropriate selection of variables should facilitate the model interpretation and computation efficiency. It is thus important to incorporate domain knowledge of underlying data generation mechanism to select key variables for improving the model performance. However, general variable selection techniques often do not take the underlying data generation mechanism into considerations. This thesis proposal aims to develop statistical modeling methodologies with a focus on the structured variable selection towards better model interpretation and computation efficiency. The proposed approaches have been applied to real-world problems to demonstrate their model performance.
Støvne, Eivind Myklebust, and Isak Søgaard Vallinder. "Energy efficiency in glass buildings : A study about the energy efficiency of glass buildings in Stockholm and how related demands are met." Thesis, KTH, Hållbar utveckling, miljövetenskap och teknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-278157.
Full textBygg- och fastighetssektorn står för en tredjedel av den slutliga energianvändningen i Sverige, vilken måste minimeras för att nå miljömässiga hållbarhetsmål. Att bygga i glas är populärt bland moderna byggnader, trots att glas har relativt låg termisk isolationsförmåga. Motsättningen mellan behovet av energieffektivitet och efterfrågan på “glashus” skapade ämnet för denna rapport. Detta kandidatexamensarbete utforskar hur energieffektivitetskrav möts i nio olika glasbyggnader i Stockholm. Glashus och nuvarande lagstiftning diskuteras ur ett miljömässigt hållbarhetsperspektiv. Detta gjordes genom undersökningar av Boverkets krav ur ett historiskt perspektiv, kvantitativa mätningar av värmeflöden, samt intervjuer med aktörer kopplade till byggnaderna och svensk bygglagstiftning. Studien visar att byggnation av glashus har blivit möjlig på grund av en omstrukturering av energieffektivitetskraven samt teknisk utveckling. Det visade sig att andelen glas i de undersökta byggnaderna oftast var lägre än det såg ut. Större andel glas i klimatskalet krävde kreativa åtgärder för att uppnå energilösningar inom lagstiftningen. Det visade sig också att solinstrålning var den största energiutmaningen för glasbyggnaderna. Trots utmaningarna finns värden anknutna till estetik och välmående som skapar en efterfrågan på glashus, och detta leder till att glashus fortfarande kommer inkluderas i stadsmiljön framöver. En slutsats från arbetet är att energiprestandan i glasbyggnader är svagare än för konventionella “tätväggsbyggnader”. Förbättringar av glaskonstruktionen gällande isolationsförmåga och utestängning av värme från solinstrålning måste realiseras för att stärka den miljömässiga hållbarheten för denna byggnadskategori.
Šumić, Mersiha. "Thermal Performance of a Solarus CPC-Thermal Collector." Thesis, Högskolan Dalarna, Energi och miljöteknik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:du-14526.
Full textGaidys, Vytautas. "Aukštadvario, Sukončių ir Pabradės hidroelektrinių darbo efektyvumo tyrimai." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2009. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2008~D_20090114_153935-74229.
Full textThe problem considered in this paper is that there aren’t many natural water resources in Lithuania. That’s why, rational consumption of water with any or very insignificant harm to the nature done, is a matter of great concern of every hydroenergetic. All matters should be taken into consideration. However, without bearing in mind all the concerning matters, having incorrect technical data or its incorrect evaluation may lead to ineffective usage of water resources in little water-power stations and even catastrophic consequences, that may affect natural environment. Available water resources are precious. So, it is important to strive to use every cubic metre of water in hydroenergetics to be of the greatest benefit for the society. Three small hydropower plants in Aukstadvaris, Sukonciai and Pabrade were tested for amount of water consumption and for flowing water energy with different water head. Also there was collected data about produced electrical energy in every water- power station (kWh). After having organized all the data, was worked out technique how to count amount of water flowing through turbines and also amount of electricity (kWh) generated by those turbines. The facts make the output graphs that are compared with other producers aggregates’ data of efficiency. Keywords: rational usage, coefficient of efficiency, efficiency.
Heppell, Neil James. "Continuous-flow sterilization processes : a comparison between predicted and measured sterilization efficiency in homogenous liquid foods and measurement of the solid-liquid heat transfer coefficient in the sterilization." Thesis, University of Reading, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303072.
Full textJackevičiūtė, Neringa. "Lietuvos bankininkystės plėtra ir jos intelektiniai ištekliai." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2009. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2008~D_20090204_110400-95423.
Full textThe theme of Master’s Work is actual today because it has been generally noticed that there is a growing difference between the organization’s market value and the real value, traditional measurements of profit are no longer able to reflect the current situation correctly as they calculate only a profit and not – the added value. The new point in this theme is being carried out by the relation between traditional profit measurements and non-financial calculations of intellectual assets efficiency, which is being analysed in order to reveal whether non-financial indicators are capable to represent the information about the successful activity of a bank. The object of the research – the effective use of intellectual assets. The subject of the research – the importance of intellectual assets in further development of banking sector. The goal formulated for this work is to define the importance of intellectual assets in growth of banking sector and also to foresee further stages of development. The tasks that are formulated for this work: 1. To define the concept of intellectual assets and to analyse its definitions in literature; 2. To reveal the importance of intellectual assets for an organization; 3. To analyse the measurement methods of intellectual assets and compare them to traditional profit measurement methods. 4. To foresee further development stages of banking sector, by using the information which has been collected via calculations of intellectual assets. The... [to full text]
Kohout, Jiří. "Tepelné čerpadlo s akumulací." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-318652.
Full textSahiner, Halit. "Hydraulic Characteristics Of Tyrolean Weirs Having Steel Racks And Circular-perforated Entry." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614247/index.pdf.
Full textJoubert, Rita. "Solid-liquid mass transfer in trickle bed reactors." Diss., Pretoria : [s.n.], 2009. http://upetd.up.ac.za/thesis/available/etd-06242009-140938/.
Full textGirdvainis, Voldemaras. "Asinchroninių variklių su sinusinėmis trifazėmis apvijomis tyrimas." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2010. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2010~D_20100618_134306-12927.
Full textThe paper assesses the electromagnetic properties of stator winding of eight types of three-phase asynchronous motors, by performing harmonic analyses of the rotary magnetomotive forces they generate and using these results to calculate the electromagnetic efficiency coefficients. It was established that the best electromagnetic parameters are those of the sinus tri-phase winding with the largest medium and shortened step with optimised rotary magnetomotive force. Experimental analysis of a factory-made three-phase asynchronous 1,5 kW motor with a single layer form winding and the same rewound motor with sinus stator winding was performed. All energetic indicators of the factory-made asynchronous motor with a single layer form winding and the rewound motor with sinus three-phase winding were calculated after performing their no-load and load testing, and using the method of separate power loss. It was established that the phase current of the stator winding of the rewound asynchronous motor with a sinus three-phase winding, deceased by 8,2 percent at the indicated load, the power from the mains decreased by 5,3 percent, the power loss decreased by 10,4 percent, the efficiency coefficient increased by 1,9 percent and the power coefficient increased by 3,4 percent as compared to the respective indicators of the factory-made asynchronous motor at the same load. It was established that the asynchronous motor which has the three-phase winding with the larger electromagnetic... [to full text]
Bártů, Marek. "Energetická účinnost tepelných čerpadel." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-241708.
Full textLuke, Mark Elden. "Predicting Drag Polars For Micro Air Vehicles." Diss., CLICK HERE for online access, 2003. http://contentdm.lib.byu.edu/ETD/image/etd297.pdf.
Full textDragan, Urošević. "Razvoj modela za vrednovanje složenih kogenerativnih postrojenja." Phd thesis, Univerzitet u Novom Sadu, Fakultet tehničkih nauka u Novom Sadu, 2014. https://www.cris.uns.ac.rs/record.jsf?recordId=87685&source=NDLTD&language=en.
Full textA model for energy evaluation of a cogeneration plant is proposedand tested with the calculation of electric power loss done by meansof a procedure which is particularly specified and proposed.The model itself can and should be used as a powerful tool for thecreation of energy policies in the part regarding cogeneration since itgives opportunities for a clear energy evaluation of a plant in terms ofefficiency and primary energy saving, as well as for defining whichpart and to what extent cogeneration should be stimulated, that is,potentially represented within a specified energy system.The proposed model has been tested on a cogeneration plant withthe capacity of 150 MW.
Aggarwal, Kajal. "Impact of preclinical PET scanner characteristics on the overall image quality." Thesis, Strasbourg, 2019. http://www.theses.fr/2019STRAE028.
Full textPositron Emission Tomography (PET) is one of the nuclear imaging techniques, used in the field of oncology, cardiology and neurology as a functional imaging modality. During the last three decades, advancement of PET modality and the development of animal models of human disease have lead to the development of PET technology dedicated to small animals. Due to the size difference between humans and mice, small animal scanners require improved spatial resolution. Due to the improved spatial resolution, the voxel size decreases significantly thereby, reducing the number of signals from a voxel. Higher the detected counts, higher the signal-to-noise ratio (SNR), thus improvement in the detection efficiency also plays an important role. Our objective is to study the impact of PET scanner characteristics on the overall image quality. To achieve this, we have simulated four different scanner designs. The idea behind the selected scanner designs studied in this thesis is to progressively add an extra dimension in the estimated position of interaction of the gamma photon, i.e., going from 2D detection to 3D detection. We demonstrated that it is possible to decouple the spatial resolution and detection efficiency, improving both simultaneously. Further, we characterized that improving spatial resolution results in improved Recovery Coefficient (RC). Detection efficiency impacts the SNR, which further impacts the estimated error in the RC values. However, there are other factors such as image reconstruction approach and normalization corrections that degrade these error values. Thus, it is important to not only improve the performance parameters of the scanners but also to accurately implement the image reconstruction process, so as to correctly quantify the improvement in the image quality
Akil, Fabiana. "Avaliação da estratégia de coleta de células progenitoras hematopoiéticas em dias subsequentes para transplante autólogo em pacientes com patologias hematológicas." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/17/17155/tde-08012019-145413/.
Full textIn this dissertation, the evaluation of the hematopoietic progenitor cell collection strategy for hematopoietic stem cells at Hemorio in the period from July 2004 to July 2015 was proposed, in order to verify if the collection efficiency or efficacy deteriorates on subsequent days. The results of this study may indicate that there is a more favorable day for collection, in which the processing of larger blood volumes may increase the chance of success, reserving the subsequent days as an exception rather than as a rule, reducing the risks and associated costs collection. INTRODUCTION: Bone marrow transplantation has a relevant role in the treatment of several non-hematological and hematological malignancies such as multiple myeloma and lymphoma. The process of collecting these cells through multiple punctures in the bone marrow is a limiting factor for their use. Peripheral blood hematopoietic progenitor cells collected by automated apheresis represent the main source for bone marrow transplantation, either by the ease of the method, by the earlier hematopoietic recovery or by the low risk of adverse events. Although this methodology has several benefits, it is still necessary to seek alternatives to improve its effectiveness. MATERIALS AND METHODS: A total of 109 apheresis procedures were studied in 47 patients mobilized with G-CSF alone and with collection initiated in D5 of mobilization. The efficacy and efficiency of these procedures were analyzed in patients submitted to at least 2 procedures on subsequent days, with a comparison of the results from day 1 to day 2 and from day 2 to day 3. Also, the variables CD34+ pre-collection and volemia processed were analyzed. RESULTS: There was a statistically significant difference between the efficacy of days 1, 2 and 3. Efficiency and volume of processed blood volume did not show any difference, and pre-collection CD34 + cell count was only relevant when comparing the 2 nd day of collection with the 3rd. The institutional average of the coefficient of efficiency was 50.51%. DISCUSSION: The efficacy of the apheresis procedure depends on physical and biological factors. The greater efficacy in the 1st day of collection in relation to 2nd and 3rd day without changes in physical factors leads us to suggest that the biological behavior of the patient is responsible for this result. This depends on the amount of pre-collection CD34+ cells and intra-apheresis recruitment. As there was no expressive variation of pre-collection CD34+ cells, we believe that recruitment was responsible for these results. Therefore, we suggest that the planning of collection of hematopoietic progenitor cells from the peripheral blood be done in order to reach the goal in a single day, possibly using day 2 and 3 for complementation. Therefore, apheresis procedures with appropriate anticoagulant toxicity should allow the processing of larger volumes of blood, aiming to reach the collection goal in a single procedure.
Parment, Rasmus. "En jämförelsestudie av värmeväxlare : Värmeöverföring för värmeväxlare i korrosiva miljöer." Thesis, Mittuniversitetet, Avdelningen för kemiteknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-34948.
Full textThere are huge gains in both the transport and industry sectors by making material use more efficient in products. This gain is found in both material costs and energy efficiency. Scandymet AB is a company that manufactures heat exchanger and electric immersion heaters for the surface treatment industry. This report aims to evaluate how well a spreadsheet used as basis for the dimensioning of heat exchangers at the company is consistent with reality. A test rig has therefore been designed and constructed to investigate the validity of the spreadsheet. The report presents the results of tests on four different heat exchangers and the results have been compared with the company’s spreadsheet. In all tests water has been used as the media to be heated, but since Scandymet AB’s heat exchanger’s main application is corrosive liquids, therefore I consider that a deeper investigation with additional fluids would be necessary to further deepen the knowledge in the area.
Krukas, Donatas. "Žemaičių Naumiesčio anaerobinės nuotekų valyklos veikimo efektyvumo įvertinimas." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2007. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2007~D_20070808.113514-22519.
Full textIn Lithuania the problem of low wastewater treatment efficiency in anaerobic hybrid reactors also rised. It was determined that one of main reasons of bad wastewater treatment quality in anaerobic hybrid reactors was insufficient volume of equipment and the equipment would be cheap and not complicated. In anaerobic wastewater are not used an electricity. And it is an advantage of wastewater, but there are also problems in cleaning wastewater until permissible concentrations. In the article are generalized 2004-2006 year researches Silutes area in Zemaiciu Naumiestis about wastewater treatment efficiency and analysed reasons for which are insufficient cleaned wastewater treatment. In anaerobic hybrid reactor the efficiency of wastewater treatment depends on volume load. There are found, that are used just small part of volumetric load because of uneven wastewater repartition in anaerobic reactor repository.
Ethier, Jonathan L. T. "Antenna Shape Synthesis Using Characteristic Mode Concepts." Thèse, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/23464.
Full textAbebe, Yibekal Alemayehu. "Managing the soil water balance of hot pepper (Capsicum annuum L.) to improve water productivity." Thesis, University of Pretoria, 2010. http://hdl.handle.net/2263/25257.
Full textThesis (PhD)--University of Pretoria, 2010.
Plant Production and Soil Science
unrestricted
Marcos, Pedro de Almeida Fernandes Murta. "Um contributo para a análise da importância de alguns parâmetros na classe energética de edifícios." Master's thesis, Universidade de Évora, 2012. http://hdl.handle.net/10174/11555.
Full textOstanovkaitė, Aurelija. "Daugiafazių elektromechaninių keitiklių tyrimas." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2013. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2013~D_20130621_140322-75409.
Full textIn this research electromagnetic properties of single-layer former three-phase winding and the same type six-phase winding are assessed and compared. Harmonic analyses of magnetomotive force was carried out on the rotary forces they generate and, according to final results, the electromagnetic efficiency coefficients were calculated. It was established that electromagnetic parameters of the single-layer former six-phase winding are better. The efficiency coefficient of the single-layer former six-phase winding is 8,7 % higher compared to the same three-phase winding. The experimental analysis of a three-phase asynchronous 1,5 kW motor with a single-layer three-phase winding and the same rewound motor with the same six-phase winding was performed. All energetic indicators of the asynchronous motor with a single-layer former three-phase winding and rewound motor the same six-phase winding were calculated after performing a no-load and load tests. Performing a load testing of the asynchronous motor for single-layer three-phase winding and the same six-phase winding it was established that the current of the stator winding of the rewound asynchronous motor with a single-layer six-phase winding decreased by 25 % at the indicated load, the power from the network decreased by 10 %. Moreover, the power loss decreased by 38 %, the power factor increased by 4 %, the efficiency factor increased almost by 15 %, and the torque increased by 5 %. It was established that the asynchronous... [to full text]
Frigo, Jiam Pires. "CONTROLE ESTATÍSTICO DA QUALIDADE NA IRRIGAÇÃO POR ASPERSÃO." Universidade Estadual do Oeste do Parana, 2014. http://tede.unioeste.br:8080/tede/handle/tede/208.
Full textThe sprinkler irrigation system is widely used because of the possibility of high uniform distribution and to adapt itself to different crops and soils. On the other hand, the water uniform application in irrigation is affected by meteorological factors that decrease the system efficiency. There has always been some concern about the quality of products and services in human history, since all products should have desirable characteristics to be accepted by consumers. Currently, development, improvement and monitoring of new management models quality during the production process have become essential for many organizations. Thus, inspection control has enhanced by statistical techniques, losses have been decreased and it was possible to stimulate some trading competition. In this context, this study aimed at evaluating the irrigation system in a conventional sprinkler using the Christiansen Uniformity Coefficient (CUC) and the index Process Capability (CP) to correlate techniques with the system efficiency as well as verify the wind influence on irrigation by Shewhart control chart and compare the results of Shewhart control charts use with the EWMA and tabular CUSUM control charts, applied in quality control of the conventional sprinkler irrigation. In this study, 60 essays were carried out on a four irrigation sprinklers system, Xcel-Wobbler model, 1.0 m height above soil and 6.0 x 6.0 m spaced. The collectors were 1.0 m spaced apart with 0.5 m height from soil. The service pressure was monitored and appropriate to the sprinklers specifications, while wind was monitored in situ by a 2.0 m high digital anemometer. In order to evaluate the system, Christiansen Uniformity Coefficient (CUC), the index Process Capability (CP), Shewhart charts (Xbarra) and the charts of exponentially weighted moving average (EWMA) and cumulative sum (CUSUM) were used. The irrigation sprinkler system showed the best performance and was under control when the average wind speed was less than 1.0 m s-1. The use of individual Shewhart control charts visually allowed affirming that wind has a direct influence on CUC. Night irrigation showed less variability on the studied data, when compared to daytime ones and this has resulted in greater efficiency in irrigation. The CPi index showed great similarity with the Christiansen Uniformity Coefficient (CUC). It proved to be very sensitive to efficiency sprinkler (Ea) variation and able to indicate the quality of sprinkler irrigation. The EWMA chart, when compared to the control charts, was susceptible when used in autocorrelated data, according to the occurrence of false alarms. But, to the residue data without autocorrelation (the ARIMA model), the CUSUM tabular chart was more sensitive to detect variations in irrigation due to wind speed, when compared to EWMA and Shewhart charts for the same data. In sprinkler irrigation, when there is a relation between CUC and wind speed, the Shewhart chart was more indicated by simplicity, reliability and ease of interpretation, even in the presence of autocorrelated data.
O sistema de irrigação por aspersão é muito utilizado, devido à possibilidade de elevada uniformidade de distribuição e por adaptar-se às diversas culturas e solos. Porém, a uniformidade de aplicação de água nas irrigações é afetada por fatores meteorológicos que diminuem a eficiência do sistema. A preocupação com a qualidade de produtos e serviços oferecidos sempre esteve presente na história da humanidade, pois para que os produtos fossem aceitos, deveriam possuir características desejáveis pelos consumidores. Atualmente, com o surgimento de novos modelos gerenciais, a melhoria e o monitoramento da qualidade durante o processo de produção tornaram-se uma necessidade para muitas organizações. Assim, aprimorou-se o controle da inspeção por meio de técnicas estatísticas, reduziram-se perdas e foi possível competir no mercado. Neste contexto, o objetivo deste estudo foi avaliar a irrigação em um sistema por aspersão convencional, utilizando o Coeficiente de Uniformidade de Christiansen (CUC), o índice de Capacidade do Processo (CP) para correlacionar as técnicas com a eficiência do sistema, verificar a influência do vento na irrigação pelo gráfico de controle de Shewhart e confrontar os resultados da utilização dos gráficos de controle de Shewhart, com os gráficos de controle MMEP e CUSUM tabular, aplicados no controle de qualidade da irrigação por aspersão convencional. Neste estudo, foram realizados 60 ensaios em um sistema de irrigação por aspersão convencional. O sistema era constituído de quatro aspersores, modelo Xcel-wobbler, altura de 1,0 m em relação ao solo e espaçamento de 6,0 x 6,0 m. Os coletores foram espaçados em 1,0 m entre si com altura de 0,5 m do solo. A pressão de serviço foi monitorada e adequada às especificações dos aspersores, e o vento monitorado in loco, por um anemômetro digital com 2,0 m de altura. Para a avaliação do sistema, foram utilizados o Coeficiente de Uniformidade de Christiansen (CUC), o índice de Capacidade do Processo (CP), gráficos de Shewhart (Xbarra) e os gráficos de média móvel exponencialmente ponderada (MMEP) e de soma cumulativa (CUSUM). O sistema de irrigação por aspersão convencional teve melhor desempenho e esteve sob controle, quando a velocidade média do vento esteve menor que 1,0 m s-1. O uso dos gráficos individuais de controle de Shewhart possibilitou afirmar visualmente que o vento tem influência direta sobre o CUC. A irrigação noturna apresentou menor variabilidade nos dados, quando comparados aos dados do período diurno e isso resultou em maior eficiência na irrigação. O índice CPi teve grande similaridade com o Coeficiente de Uniformidade de Christiansen (CUC); mostrou-se bastante sensível à variação da eficiência de aspersão (Ea) e capaz de indicar a qualidade da irrigação por aspersão. Em comparação aos gráficos de controle, o gráfico MMEP mostrou-se suscetível quando utilizado em dados autocorrelacionados, pelas ocorrências de alarmes falsos. Para dados de resíduos, sem autocorrelação (pelo modelo ARIMA), o gráfico CUSUM tabular foi mais sensível ao detectar as variações ocorridas na irrigação devido à velocidade do vento, quando comparado aos gráficos MMEP e Shewhart para os mesmos dados. Na irrigação por aspersão, relacionando CUC com velocidade do vento, o gráfico de Shewhart foi mais indicado pela simplicidade, confiabilidade e facilidade de interpretação, mesmo na presença de dados autocorrelacionados entre si.
Wang, Xuechao. "Critical Transmission Sectors of Energy-Water-GHG Nexus." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-433461.
Full textEl, Ghouli Salim. "UTBB FDSOI mosfet dynamic behavior study and modeling for ultra-low power RF and mm-Wave IC Design." Thesis, Strasbourg, 2018. http://www.theses.fr/2018STRAD015/document.
Full textThis research work has been motivated primarily by the significant advantages brought about by the UTBB FDSOI technology to the Low power Analog and RF applications. The main goal is to study the dynamic behavior of the UTBB FDSOI MOSFET in light of the recent technology advances and to propose predictive models and useful recommendations for RF IC design with particular emphasis on Moderate Inversion regime. After a brief review of progress in MOSFET architectures introduced in the semiconductor industry, a state-of-the-art UTBB FDSOI MOSFET modeling status is compiled. The main physical effects involved in the double gate transistor with a 7 nm thick film are reviewed, particularly the back gate impact, using measurements and TCAD. For better insight into the Weak Inversion and Moderate Inversion operations, both the low frequency gm/ID FoM and the proposed high frequency ym/ID FoM are studied and also used in an efficient first-cut analog design. Finally, a high frequency NQS model is developed and compared to DC and S-parameters measurements. The results show excellent agreement across all modes of operation including very low bias conditions and up to 110 GHz
恭平, 坂上, and Kyohei Sakagami. "金属Vベルト式CVTの摩擦伝動限界の予測に関する研究." Thesis, https://doors.doshisha.ac.jp/opac/opac_link/bibid/BB13071664/?lang=0, 2018. https://doors.doshisha.ac.jp/opac/opac_link/bibid/BB13071664/?lang=0.
Full textWhen fluctuations in the speed of rotation of the drive pulley are transmitted to the driven pulley via the metal V-belt, the transmitted fluctuations become attenuated as friction force approaches a state of saturation. The research discussed in this paper focused on these fluctuations in the speed of rotation and developed an index for the slip state between the belt and the pulleys.
博士(工学)
Doctor of Philosophy in Engineering
同志社大学
Doshisha University
Tang, Lin. "Efficient Inference for Periodic Autoregressive Coefficients with Polynomial Spline Smoothing Approach." University of Toledo / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1449770216.
Full textMobiglia, Andrea de Mello. "Digestibilidade aparente da dieta de touros da raça nelore selecionados pelo consumo alimentar residual." Universidade Federal de Goiás, 2014. http://repositorio.bc.ufg.br/tede/handle/tede/3494.
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Owing to the potential of utilization of residual feed intake as tool for genetic selection becomes indispensable the studies that looking for understand the variables influence RFI, principally data from cattle of Nellore breed, consist with Brazilian reality. The aim of this study was to evaluate the apparent digestibility of diet of Nellore bulls classified by residual feed intake (RFI). One hundred and twenty Nellore bulls were used , with body weight (BW) of 392.5 ± 47.15 kg. The animals were maintained in a feedlot with individual pens and fed with the same diet for 83 days. The animals were fed ad libitum and the diet was composed of sorghum silage, sugarcane bagasse and concentrate, in relation 33:67 (V: C) in dry matter. The animals were weight at the beginning of the trial and every 28 days after the solid feed restriction. The refused and offered fed were weight to measure the daily feed intake. RFI was calculate by difference between the observed intake and estimated intake what was obtained through a multiple regression equation of feed intake, average daily gain (ADG) and metabolic body weight (MBW) of the animals. On eighth week was realized a digestibility assay. To estimate the fecal production was used indigestible neutral detergent fiber (NDFi) as internal marker. The randomized design was used for statistical analysis. The ADG and BC were the same for different RFI groups (P>0.05), despite of low RFI animals showed lower feed intake (P<0.05) than medium and high RFI. However, the digestibility coefficient did not differ between the RFI groups (P>0.05). In contrast, the apparent digestibility of NFC was negative correlated (– 0,23) with the RFI.
Tendo em vista o potencial de utilização do consumo alimentar residual como ferramenta para seleção genética torna-se imprescindível estudos que procuram entender as variáveis que influenciam o CAR, principalmente dados com bovinos da raça Nelore condizentes com a realidade brasileira. O objetivo deste estudo foi avaliar a digestibilidade aparente da dieta de touros da raça Nelore classificados pelo consumo alimentar residual (CAR). Foram utilizados 120 touros da raça Nelore, com peso corporal (PC) de 392,5 ± 47,15 kg. Os animais foram mantidos em confinamento com baias individuais e alimentados com a mesma dieta por 83 dias. Todos os animais foram alimentados à vontade e a dieta era composta de silagem de sorgo, bagaço de cana e concentrado, na relação 33: 67 (V: C) na matéria seca. Os animais foram pesados no inicio do experimento e a cada 28 dias após jejum de sólido. Diariamente foram pesadas as sobras e o fornecido para determinar o consumo diário. O CAR foi calculado pela diferença do consumo observado e estimado, o qual foi obtido por uma equação de regressão entre consumo, o ganho de peso diário e peso corporal médio metabólico dos animais. Na 8ª semana do experimento foi realizado ensaio de digestibilidade. O marcador interno utilizado para estimar a produção fecal foi a fibra em detergente neutro indigestível (FDNi). Para as análises estatísticas, foi utilizado delineamento inteiramente casualizado. O ganho médio de peso diário (GMD) e PC foram os mesmos para as classes de CAR (P>0,05), apesar dos animais de baixo CAR apresentar menor ingestão de nutrientes (P<0,05) que os animais de médio e alto CAR. Entretanto, os coeficientes de digestibilidade não diferiram entre os grupos (P>0,05). Em contraste, a digestibilidade aparente dos CNF apresentou correlação negativa de -0,23 com o CAR.
Юр'єв, Е. В. "Удосконалення нафтогазового сепараційного обладнання газорідинних сумішей." Thesis, Івано-Франківський національний технічний університет нафти і газу, 2011. http://elar.nung.edu.ua/handle/123456789/1947.
Full textIn theory is explained and expedience and efficiency of separating of gasliquid mixture is experimentally confirmed in tie separators of vortical type, internal elements are entered in tie structural chart ofwhich. Motion of gasliquid mixture is mathematically described on tie entrance and exit from a separator, and also at its motion through his internal workings elements. The computer design of vortical streams of mixture is carried out at their co-operation with deflectorom and elements of separating package. The mathematic model of motion of gasliquid mixture h a separator, with the use of which, and also multicriterion optimization, is offered tie rational structural parameters of its elements and coefficients of efficiency of separator are certain. The developed constructions of separators are protected by patents on tie inventions and useful models of Ukraine and Russia.
Ainegren, Mats. "Roller skis' rolling resistance and grip characteristics : influences on physiological and performance measures in cross-country skiers." Doctoral thesis, Mittuniversitetet, Institutionen för teknik och hållbar utveckling, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-16446.
Full textSyftet med denna avhandling var att undersöka fristils- och klassiska rullskidors rullmotståndskoefficienter (μR) och klassiska rullskidors statiska friktionskoefficienter (μS) samt effekter av olika μR och μS på längdskidåkares prestation vid rullskidåkning på rullande band. Syftet var även att undersöka s.k. åkekonomi och mekanisk verkningsgrad mellan motionärer och kvinnliga och manliga junior- och seniorlängdskidåkare på elitnivå.Experimenten visade att under en period av 30 minuters kontinuerligt rullande, på rullande band, så sjönk μR signifikant (p<0.05) till 60-65 % och 70-75 % av initiala värden, för fristils- respektive klassiska rullskidor. Undersökandet av olika normalkrafter, hastigheter och lutningars påverkan på μR resulterade i en signifikant, negativ korrelation för μR som funktion av normalkraft, medan olika hastigheter och lutningar endast medförde små förändringar av μR.Studien som undersökte fysiologiska effekter av olika μR visade, vid submaximala konstanta arbetsbelastningar, att yttre effekt, syreupptagning, hjärtfrekvens och blodlaktat förändrades signifikant vid ~50 % förändring av μR. Försökspersonernas frekvens och sträcka per frekvens samt skattning av upplevd ansträngning resulterade dock i mestadels icke signifikanta eller små förändringar. Protokollen med successivt ökande arbetsbelastning (maxtest) resulterade i signifikant förändrad tid till utmattning, vid ~50 % förändring av μR. Detta inträffade utan signifikant skillnad i maximal syreupptagning, hjärtfrekvens och blodlaktat, vilket även mestadels gällde för skattning av upplevd ansträngning.Experimenten som undersökte klassiska rullskidors μS visade att dessa erhöll värden som är fem till åtta gånger högre än vad som rapporterats från studier av μS på snö med fästvallade skidor.Den efterföljande studien som undersökte fysiologiska och biomekaniska influenser av olika μS visade, vid submaximala konstanta arbetsbelastningar, att åkekonomin försämrades (~14 % högre syreförbrukning), hjärtfrekvensen ökade, den framåtdrivande kraften från benen på rullskidorna minskade samt att det blev kortare tid till utmattning (~30 %), vid maxtest, när skidåkarna använde rullskidor med en μS i likhet med vad som rapporterats för skidåkning på snö. För arbetsförsöken med olika rullskidor av olika fabrikat med en högre, och likartad, μS förelåg ingen skillnad i de undersökta variablerna.Studien som undersökte åkekonomi och mekanisk verkningsgrad som funktion av prestationsnivå, ålder och kön, visade att elitskidåkarna hade bättre åkekonomi och verkningsgrad (5-18 %) i jämförelse med motionärerna, att seniorerna hade bättre åkekonomi och verkningsgrad (4-5 %) än juniorerna och att ingen skillnad kunde konstateras mellan könen.
Hamade, Firas Nadim. "Sediment removal from urban runoff using seep berms and vegetative filtration." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/50271.
Full textSantos, Henrique Zenker dos. "Determinação do coeficiente e expoente de escoamento em esquadrias nacionais, para análise de infiltração de ar em edificações." Universidade do Vale do Rio dos Sinos, 2016. http://www.repositorio.jesuita.org.br/handle/UNISINOS/6018.
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CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Países desenvolvidos apresentam crescimento contínuo nas taxas globais de consumo de energia. Um dos fatores preponderantes está relacionado ao uso de condicionadores de ar para manutenção das condições de conforto no interior de edificações, onde tal parcela já atinge valores de consumo superiores aos dos setores de indústria e transporte. Sabe-se que o consumo devido ao condicionamento de ar afeta diretamente o desempenho energético e ambiental de uma edificação e, por conseguinte, a qualidade de habitação e de vida dos usuários. No Brasil este processo ocasiona um vertiginoso incremento nos gastos públicos, com inúmeras consequências de ordem econômica e social. Dados do Ministério de Minas e Energia indicam que 20% da energia consumida no país é destinada ao abastecimento de residências. Cenário este que tende a evoluir devido aos constantes lançamentos do mercado imobiliário, derivativos de planos habitacionais estimulados pelo governo federal (como o Minha Casa Minha Vida), em decorrência do déficit habitacional registrado no país. Atrelado a isso observa-se o baixo padrão construtivo das edificações e o emprego de materiais e esquadrias de qualidade igualmente diminutas, que acarretam em ineficiências de carga térmica. A taxa de infiltração em uma edificação é regida pela relação estabelecida por uma equação de lei de potência, caracterizada pela presença de um coeficiente de escoamento “C” e um expoente de escoamento “n” (geralmente da ordem de 0,667 [-]). Esta dissertação apresenta, para uma esquadria de alumínio, modelo de correr, o coeficiente de escoamento C = 0,028 [dm³/s.m.Pan] e o expoente de escoamento “n” 0,552 [-]. Para uma esquadria de PVC, modelo integrado, o coeficiente de escoamento C = 0,022 [dm³/s.m.Pan] e o expoente de escoamento “n” 0,605 [-].
Developed countries have continued growth in global energy consumption rates. One of the most important factors is related to the use of air conditioners to the comfort conditions inside buildings’ maintenance, which such a part already reaches consumption values higher than the industry and transportation sectors. It is known that consumption due to air conditioning directly affects the energy and environmental performance of a building and therefore the house’s quality and the people’s life. In Brazil, this process leads to a big increase in public spending, with many consequences of economic and social order. Information from the Ministry of Mines and Energy indicate that 20% of the energy consumed in the country is used for supplying homes. This scenario tends to evolve due to the constant housing market releases, derived from housing plans stimulated by the federal government (such as “Minha Casa Minha vida”), in consequence of the housing deficit registered in the country. Related to this, it is observed the low construction standards of buildings and the use of materials and frames of low quality that lead to thermal load inefficiencies. Engineers and architects spend a part of their activities in creating scenarios for evaluating the thermal load calculation and vulnerability due to the influence caused by air infiltration into the environment. The infiltration rate of a building is managed by the established relationship by a power law equation, which is characterized by a flow coefficient "C" and a flow exponent "n" (usually on the value of 0.667 [-]). This work shows for an aluminum window, sliding template, the flow coefficient C = 0.028 [dm³/s.m.Pan] and the flow exponent "n" 0.552 [-]. For PVC window, integrated model, the flow coefficient C = 0.022 [dm³/s.m.Pan] and the exponent flow "n" 0.605 [-].
Barbosa, Fernando da Silva. "Produtividade de cana-de-açúcar irrigada por gotejamento: Interações entre variedades, lâminas e intensidade do déficit hídrico na fase de maturação." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/11/11152/tde-09042015-131434/.
Full textThe sugarcane industry is currently facing an industrial and agricultural crisis, lacking research to reverse this situation, depending on the raw material at competitive costs, and this inevitably entails the increase in productivity in the field. The use of irrigation systems is imposed as an alternative, but requires considerable investments to irrigate professionally. In addition, the growing demand for food and competition for water resources worldwide, are a reality that drives the more efficient water use in all sectors, especially in agriculture. Thus, with the hypothesis that there is for each variety of sugar sugarcane, a more appropriate mix between irrigation depth and intensity water deficit during ripening, in order to maximize productivity, the aim of this work was to evaluate the effect of four irrigation depths and four levels of water stress during ripening, for eight drip irrigated sugarcane varieties, analyzing the variables related to quality and productivity per area unit, as well as quantifying productivity per unit of evapotranspired water (water productivity). The experiment was conducted in a greenhouse at the \"Luiz de Queiroz\" College of Agriculture (USP) in Piracicaba-SP. Treatments were arranged in a factorial design (4x4x8) with split-split-plot with three replicates, totaling 128 treatments and 384 plots, and the plots consist of a box with about 330 liters of soil containing two plants. The evaluated irrigation depths (L50, L75 and L100 L125) were variations in the fraction applied over time, relative to the treatment L100, where soil moisture remained close to field capacity (θcc) throughout the experiment. Each tested variety had its own reference L100. The intensities of water deficit during maturation were evaluated for M1 (moderate water deficit of long duration), M2 (intensive water deficit of long duration), M3 (no water deficit) and M4 (severe water deficit of short duration). The sugarcane yield (TCH) was favored by the combination L100 and M3, regardless of the studied variety, with an estimated average value of 232.2 t ha-1. Among the varieties, V4 had the highest TCH, with average of averaging 250.4 t ha-1 for L100. Sugar yield (RBA) is directly linked to sugarcane yield and is also favored by the combination of L100 and M3, with an average value of 23.4 t ha-1. The V1, V2, V4 and V6 varieties, for irrigation depth L100, did not differ significantly for RBA and had the highest average, 23.9 t ha-1. The water productivity in sugar and biomass differed in 4 and 2 variety groups, respectively, and was independent of the adopted irrigation depth and maturation management. The result for water productivity is characteristic of drip irrigation, where losses by evaporation are minimized and water retention in the leaves does not exist. Thus, one should consider the possibility of full drip irrigation, instead of the deficit one, for sugarcane.
Костюк, Сава Андрійович. "Технологічне забезпечення підвищення працездатності пальців сферичних шарнірів статико-імпульсною обробкою." Diss., Тернопільський національний технічний університет ім. Івана Пулюя, 2021. http://elartu.tntu.edu.ua/handle/lib/35992.
Full textPh. D. thesis in Engineering Science by specialty 05.02.08 “Mechanical Engineering Technology”. – Ternopil Ivan Puluj National Technical University, Ternopil, 2021. The dissertation solves the scientific and applied problem of increasing the working capacity of the fingers of spherical joints by static-impulse processing due to the formation of improved properties of the hardened surface. In modern mechanical engineering, spherical sliding hinges are widely used to improve the performance of which it is recommended to harden the working surfaces of the fingers with the possibility of forming a geometrically defined oil-retaining profile. Therefore, the creation of special technological equipment for bipolar static-pulse hardening, the substantiation of the parameters and operating modes, in fact, forms a scientific and applied problem that requires a solution and is relevant for various branches of mechanical engineering. The scope of application and various design options for the execution of spherical hinges, their life cycle is considered, and a classification of factors that affect its performance is presented. A comparative analysis of the requirements for materials for the manufacture of spherical hinge pins is presented. The existing options for the formation of an oil-retaining profile on the outer incomplete spherical surface are considered. The analysis of methods of hardening of spherical surfaces is carried out on the basis of which scientific directions of research are determined and recommendations for the creation of technological equipment of bipolar action are developed. Theoretical prerequisites have been developed and a number of experimental studies have been carried out, on the basis of which a method and scheme of bipolar static-pulse hardening has been proposed. A schematic diagram of the process of bipolar static-pulse processing of incomplete spherical surfaces has been developed, which was taken as the basis for the design of technological equipment. The influence of technological parameters on the value of the deforming tool feed is considered and mathematical dependences are derived to determine the processing modes taking into account the coefficient of overlapping of plastic imprints.
Weerasekara, Aruna Bandara. "Electrical and Optical Characterization of Group III-V Heterostructures with Emphasis on Terahertz Devices." Digital Archive @ GSU, 2007. http://digitalarchive.gsu.edu/phy_astr_diss/16.
Full textМейріс, Антон Жанович. "Теплообмін та теплогідравлічна ефективність пучків труб з поверхневими заглибленнями." Thesis, Інститут технічної теплофізики НАН України, 2018. https://ela.kpi.ua/handle/123456789/38181.
Full textДисертація присвячена експериментальному та теоретичному дослідженню теплообміну та гідродинаміки при поперечному обтіканні одиночної труби та пучку труб із поверхневими заглибленнями. Теоретично досліджено теплообмін та гідродинаміку при поперечному обтіканні одиночної труби із поверхневими заглибленнями у формі усіченого конусу за допомогою комп’ютерного пакету ANSYS CFX. Проведено верифікацію моделей турбулентності. Наведено результати досліджень вихрової структури потоку, точки відриву потоку, зони зворотних течій, коефіцієнту лобового опору, коефіцієнту теплообміну. Проведено експериментальні та теоретичні дослідження теплообміну та гідродинаміки при поперечному обтіканні п’ятирядного пучку труб із поверхневими заглибленнями. Отримані дані щодо коефіцієнтів гідравлічного опору пучка та коефіцієнтів теплообміну по рядах та для пучка в цілому. Проведено верифікацію комп’ютерної моделі по експериментальним даним. Розроблено інженерну методику розрахунку рекуператора газотурбінної установки та проведено оцінку зниження його маси за рахунок нанесення заглиблень.
The dissertation is devoted to the experimental and theoretical study of heat transfer and hydrodynamics at the cross-flow of a single tube and a tube bundle with surface indentations. Heat transfer and hydrodynamics were studied theoretically at the cross-flow of a single tube with surface indentations in the form of a truncated cone using the ANSYS CFX computer package. Verification of turbulence models is carried out. The results of studies of the vortex structure of the flow, the point of separation of the flow, the zone of reverse flows, the coefficient of the frontal resistance, and the heat transfer coefficient are given. Experimental and theoretical investigations of heat transfer and hydrodynamics are carried out at the cross-flow of a five-row tube bundle with surface indentations. The data on the coefficients of the hydraulic resistance of the bundle and of the heat transfer coefficients for rows and for the whole bundle are obtained. Verification of the computer model by experimental data is carried out. An engineering method for calculation of the gas turbine plant recuperator was developed and an estimation of the decrease in its mass due to the application of depressions was made.
Kronsbein, Cornelia [Verfasser], and Oleg [Akademischer Betreuer] Iliev. "On selected efficient numerical methods for multiscale problems with stochastic coefficients / Cornelia Kronsbein. Betreuer: Oleg Iliev." Kaiserslautern : Technische Universität Kaiserslautern, 2013. http://d-nb.info/1030521409/34.
Full textLeskovec, Martin. "Method Development for Heat Transfer Predictions in Channel Flows : An efficient CFD approach for ribbed stationary channels." Thesis, Linköpings universitet, Mekanisk värmeteori och strömningslära, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-132166.
Full textSaulich, Sven. "Generic design and investigation of solar cooling systems." Thesis, Loughborough University, 2013. https://dspace.lboro.ac.uk/2134/13627.
Full textVoisin, Laurent. "Nitration du mononitrochlorotertiobutylbenzene en reacteurs diphasiques liquide-liquide." Paris, ENMP, 1988. http://www.theses.fr/1988ENMP0102.
Full textVích, Pavel. "Účinnost rozvodů tepla." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2015. http://www.nusl.cz/ntk/nusl-227296.
Full textVidlák, David. "Využití absorpčních systémů v teplárenství." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-378742.
Full textHoleček, Dominik. "Studium užitných vlastností termoreflexních izolací pro stavebnictví." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2019. http://www.nusl.cz/ntk/nusl-392345.
Full textHorák, Aleš. "Návrh experimentu pro řešení inverzní úlohy vedení tepla." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-233977.
Full textПоталіцин, Сергій Юрійович, Сергей Юрьевич Поталицын, and S. Yu Potalitsyn. "Розробка науково-технічних основ впровадження компактних люмінесцентних ламп в системи зовнішнього освітлення." Thesis, Тернопільський національний технічний університет ім. Івана Пулюя, 2016. http://elartu.tntu.edu.ua/handle/123456789/16241.
Full textЗахист відбудеться " 23 " червня 2016 р. о 1000 годині на засіданні спеціалізованої вченої ради К 58.052.04 у Тернопільському національному технічному університеті імені Івана Пулюя Міністерства освіти і науки України за адресою: 46008, м. Тернопіль, вул. Білогірська, 50, корп. 10 (зал засідань).
Дисертація присвячена проблемі енергозбереження в зовнішньому освітленні за рахунок використання СП із КЛЛ. Розроблено методику розрахунку світлового приладу із заданими розмірами світного тіла джерела світла та на її основі спроектовано світловий прилад з КЛЛ. Побудовано модель освітлення для різних категорій вулиць і на її основі проведено розрахунки якісних та кількісних показників установки вуличного освітлення та розроблено рекомендації для практичного впровадження КЛЛ в системи зовнішнього освітлення. Проведено експериментальні дослідження характеристик компактних люмінесцентних ламп при зміні температури навколишнього середовища. Проведено дослідження показників якості електричної енергії в системах зовнішнього освітлення із компактними люмінесцентними лампами та їх вплив на відносну похибку індукційного та електронного приладів обліку.
Диссертация посвящена проблеме энергосбережения в системах внешнего освещения периферийных районов городов и сельской местности за счёт использования световых приборов с компактными люминесцентными лампами. Использование в СП для внешнего освещения типа ГКУ11У, ЖКУ11У, РКУ11У и ЖКУ, РКУ Helios 21 нетипичных источников света в том числе и КЛЛ снижает их ККД на 14…17 %. В роботе проведено моделирование светового поля КЛЛ, в котором учтены геометрические размеры светового тела источника, что позволило увеличить точность полученных результатов на 40…60 %. Предложена математическая модель расчёта оптической системы СП с источником света заданных геометрических размеров, в которой учтено экранирующее действие светового потока источником света. Разработана методика и алгоритм расчёта СП с компактной люминесцентно лампой. Разработана модель освещения улиц разных категорий, на основе которой проведен расчет светотехнических параметров осветительной установки со световыми приборами с лампами Realux 55 Вт. Показано, что для достижения нормативных показателей освещения для категории улиц М4 и М5 максимальное расстояние между СП – 37 м, а для категории М3 – 33 м. Оптимальный угол наклона оптической оси СП относительно вертикали – 31°. Представлены результаты исследования влияния температуры окружающей среды на светотехнические параметры как отдельно взятой КЛЛ, так и помещённой в световом приборе. Установлено, что для ламп мощностью от 36 до 65 Вт при изменении температуры внешней среды от -25 °С до +25 °С температура ЭПРА не превышает допустимую температуру +80 °С, при этом световой поток изменяется от 0,92 до 1,0 относительно номинального значения. Проведены исследования влияния ОУ с СП с КЛЛ на показатели качества электрической энергии и относительную погрешность её учета. Показано, что амплитудные значения высших гармоник тока ламп превышают нормативные значения в 3 – 5 раз, что вызвано недостаточным уровнем коррекции коэффициента мощности ЭПРА КЛЛ. Это приводит к превышению относительной погрешности учёта электрической энергии на 3 – 4 %.
The thesis is dedicated to the problem of energy efficiency in outdoor lighting through the use of a fixture with a compact fluorescent lamp. The development of calculation methodology of a fixture with the target size of the luminous body of the light source has been done and on its basis a fixture with a compact fluorescent lamp has been projected. A lighting model for different types of streets has been constructed and on its basis calculations of qualitative and quantitative indicators of street lighting installments have been done as well as recommendations for the practical implementation of compact fluorescent lamps into outdoor lighting systems have been developed. Experimental studies of characteristics of compact fluorescent lamps during the change of the temperature of the environment have been done. The calculation of the thermal regime of a closed-type fixture with a compact fluorescent lamp Realux 55 W has been conducted. Research of quality indices of electricity in outdoor lighting systems with compact fluorescent lamps has been done as well as their impact on relative error of induction and electronic metering instruments.
Сніткіна, І. А., and I. A. Snitkina. "Аналітичне забезпечення управління платоспроможністю підприємства." Diss., Одеський національний економічний університет, 2019. http://local.lib/DIS/disSytnikova.pdf.
Full textУ дисертації розкрито теоретичні, методичні та практичні засади аналітичного забезпечення управління платоспроможністю, а також сформульовано висновки та рекомендації, спрямовані на застосування методики в діяльності підприємств у сучасних умовах. Проаналізовано етимологічне значення, наукові підходи до розуміння сутності таких понять, як «платоспроможність», «банкрутство», «криза», «дефолт», визначено їх співвідношення та взаємозв’язок. У межах аналізу доведено, що оцінка платоспроможності та прогнозування ризику банкрутства підприємства стає тим інструментом, який дозволяє виявити ті чи інші недоліки у його діяльності, врахувати ендогенні та екзогенні фактори впливу, а також своєчасно вжити заходи для уникнення небажаних ситуацій. Сформульовано аргументи на більш широке застосування поняття платоспроможності як здатності суб’єкта господарювання своєчасно і в повному обсязі розрахуватися за своїми поточними борговими зобов’язаннями за рахунок наявних ресурсів із збереженням безперебійного здійснення основних процесів функціонування підприємства і підвищення ефективності діяльності, що дозволило систематизувати взаємозв’язки між категоріями платоспроможності, неплатоспроможності та банкрутства.
The theoretical, methodical and practical principles of analytical support of solvency management are revealed in the dissertation, as well as conclusions and recommendations aimed at applying the methodology to the activity of enterprises in modern conditions are formulated. Etymological meaning, scientific approaches to understanding the essence of such concepts as "solvency", "bankruptcy", "crisis", "default" are analyzed, their relationships and interrelation are determined. The analysis shows that the solvency and bankruptcy risk assessment of an enterprise becomes the tool that allows to identify certain gaps in its activity, to take into account endogenous and exogenous factors of influence, as well as to take in time measures to avoid undesirable situations. Arguments for broader application of the concept of solvency as the ability of an entity to timely and fully pay for its current debt at the expense of available resources, while maintaining the smooth implementation of the basic processes of enterprise functioning and improving the efficiency of activities, which allowed to systematize the corelation between the categories of solvency, insolvency and bankruptcy are given and proved. It is proposed to expand the classification of solvency factors of an enterprise depending on the consequences of manifestation and interdependence, which will allow to model the process of ensuring solvency management further on, to carry out a comprehensive search of reserves in order to maintain or enhance it.
Micard, Diane. "Dissipation et mélange en turbulence stratifiée : une approche expérimentale." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSEC041/document.
Full textOur climate partly depends on energy exchange between warm and cold water masses in the ocean's interior. In order to understand and forecast the climate variations, numerical models of the ocean must estimate the amount of energy converted into irreversible mixing in turbulent stably stratified flows. It seems that this quantity depends on the flow parameters. This assertion challenges the famous Osborn model for turbulent diffusivity kz which uses a fixed mixing efficiency of ŋ=0.17. This motivated us to measure separately kz and ŋ in order to obtain a better understanding of their inter-dependencies. The present work is an experimental study based on set-ups which enable to quantify the mixing in different types of flow. Three of those experiments are held in our lab (LMFA) and consist respectively in a lock-exchange experiment where mixing is generated by the shear at the interface of two opposite gravity currents, a stratified towed grid experiment, and a hydraulic channel experiment where the stratification is injected directly by the grid. This study has been complemented with two international collaborations. The first one, on the Coriolis platform (LEGI) consisted in a stratified towed grid experiment in a rotating tank allowing to broaden our parameter spectrum. The second one is a series of in situ measurements led in collaboration with ISMER in the Saguenay fjord (Canada) aiming at measuring density transects over time in order to quantify the turbulent mixing that participates in the renewal of the fjord's deep water. In all of those configurations, dependencies of mixing efficiency and turbulent diffusivity along with the Froude and the Reynolds numbers are extracted from the time evolution of density profiles. In our results, we were able to quantify the decay of the mixing efficiency with the increase of the Froude number. We also highlighted the sensitivity of turbulent diffusivity on the buoyancy Reynolds number. We used three different experimental setups to show that beyond the so called universal turbulence laws, the flow geometry has a huge impact on the mixing efficiency values. This is especially true in the lock-exchange configuration where the asymptotic value of ŋ=0.25, predicted by statistical physics, can only be reached in a set-up which allows 3D flows. Such investigations are still scarce in the literature. Finally, all the data analysis methods developed for the lab experiments were of great help for the analysis of in situ data and thereby enabled us to consider a real-life environnemental flow
Zipplies, Daniel. "Effizienzsteigerung des Kunststoffblasformprozesses durch Optimierung des Drucklufteinsatzes." Universitätsverlag Chemnitz, 2020. https://monarch.qucosa.de/id/qucosa%3A70808.
Full textToday's ecological and economic requirements demand energy-efficient processing methods. Against this background, this thesis deals with the plastic blow moulding process, which, in addition to the high energy demand typical for plastics processing, requires a high degree of energy-intensive compressed air. Based on a detailed energy balance of the extrusion blow moulding process, the use of compressed air required for forming (blow air) and for internal cooling of the blowing parts (purge air) was identified as an energetic weak point. In order to reduce the amount of compressed air required for forming, a feedback process used to recycle the blowing air is investigated in detail. Furthermore, a storage system will be presented which allows a secondary use of the pressurized process exhaust air, which is continuously generated during the internal cooling of the blowing part. Finally, an optimization approach for the effective use of compressed air for the internal cooling of bottle-shaped blow-moulded parts is presented, which promises a shortening of the cooling time and a reduction of the compressed air required through the targeted use of favourable flow conditions for heat transfer.:1 Einleitung 2 Prozessanalyse des Blasformverfahrens 3 Motivation, Zielstellung und Aufbau der Arbeit 4 Energetische Bilanzierung des Extrusionsblasformverfahrens 5 Reduzierung des Druckluftaufwands bei der Formgebung 6 Sekundärnutzung der zur inneren Blasteilkühlung verwendeten Druckluft 7 Effektive Druckluftnutzung bei der inneren Kühlung flaschenförmiger Blasteile 8 Zusammenfassung und Ausblick