Dissertations / Theses on the topic 'Cycling efficiency'
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Hopker, James G. "An Investigation of efficiency within Cycling." Thesis, University of Kent, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.504668.
Full textZamparo, Paola. "Optimization and transmission efficiency in human locomotion." Thesis, Manchester Metropolitan University, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.251301.
Full textHarper, Sara Anne. "The influence of lateral foot displacement on cycling efficiency and maximal cycling power." Kent State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=kent1394551229.
Full textSaunders, S. C. "The effect of body mass change on cycling efficiency." Thesis, Canterbury Christ Church University, 2016. http://create.canterbury.ac.uk/15091/.
Full textWainright, Jesse Sumner. "Polypyrrole deposition and cycling efficiency: Rutherford backscattering spectroscopy studies." Case Western Reserve University School of Graduate Studies / OhioLINK, 1992. http://rave.ohiolink.edu/etdc/view?acc_num=case1056463837.
Full textPassfield, Louis. "Gross efficiency, maximal muscle function and cycling endurance exercise." Thesis, University of Brighton, 1998. https://research.brighton.ac.uk/en/studentTheses/3148c501-f2df-4049-8a98-3a05b56af2ca.
Full textLi, Jing. "Duty Cycling for Energy Efficiency in Wireless Sensor Networks and Applications." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1349110340.
Full textVergara, Gallego Maria Isabel. "Smarter Radios for Energy efficiency in Wireless Sensor Networks." Thesis, Grenoble, 2013. http://www.theses.fr/2013GRENM020/document.
Full textThe constraints of Wireless Sensor Networks scenarios require the introduction of optimization techniques at different design levels: from the hardware to the software and communication protocol stack. In fact, the design of energy efficient WSNs involves an appropriate hardware/software co-design oriented to the concerned application. Given the event driven and multitasking nature of WSNs applications, one could think of adding different processing units that cooperate to manage events and tasks in an optimal way. Then, the complexity of tasks performed by the main processing unit can be reduced and energy efficiency can be achieved. In this PhD thesis we study protocols that leverage the implementation of smart radios. The idea of smart radios is introducing intelligence into the radio chip; in this way, it will be able to take decisions and perform several tasks in an autonomous way and without any intervention of the main processing unit. The processing unit will be in charge of bootstrapping the network and, after a stable state is reached, it can remain inactive most of the time while the radio chip provides a given set of services. The proposed protocol is called Wake on Idle and it provides integrated neighborhood maintenance and low duty-cycle medium access control. These services are provided based on analog transmissions that are time encoded; then, as soon as the network enters the stable state (i.e. the topology is formed and nodes are associated and synchronized) digital processing of frames is not needed. Since it relies on low-level information, Wake on Idle can be easily implemented on hardware and integrated into the radio chip; then, it works as a coprocessor that provides high-level services (i.e. neighborhood maintenance and medium access) to the main processing unit. Through theoretical analysis and a preliminary implementation we demonstrate the feasibility of the protocol and we show several interesting characteristics that help achieving energy efficiency and good performance. Then, we further exploit analog signaling to optimize duty cycle of existing medium access control protocols. We propose a mechanism called Sleep on Idle and it is based on the exchange of analog busy tones. Sleep on Idle can also be integrated into the smart radio to take decisions about whether the main processing unit has to be woken up. We apply the decision mechanism to the slotted ieee802.15.4 standard and validate it through simulations and experimentations. The results show an important gain in terms of energy consumption and network reactivity
Leib, Daniel J. "The effects of cleat placement of muscle mechanics and metabolic efficiency in prolonged sub-maximal cycling." CardinalScholar 1.0, 2008. http://liblink.bsu.edu/uhtbin/catkey/1427389.
Full textSchool of Physical Education, Sport, and Exercise Science
O'Hara, Christiane Rose. "Effects of chainring design on performance in competitive cyclists." DigitalCommons@CalPoly, 2011. https://digitalcommons.calpoly.edu/theses/625.
Full textDevlin, Tate Bross. "The Influence of Body Composition on Cadence Efficiency in Competitive Cyclists." Miami University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=miami1470146734.
Full textBurns, Jack. "Does training with PowerCranks affect economy of motion, cycling efficiency, oxygen uptake and muscle activation patterns in trained cyclists?" Connect to thesis, 2008. http://adt.ecu.edu.au/adt-public/adt-ECU2008.0017.html.
Full textScheps, Amanda. "An evaluation of cardiorespiratory responses and ventilatory efficiency during treadmill and cycling exercise in overweight adolescents." VCU Scholars Compass, 2010. http://scholarscompass.vcu.edu/etd/2313.
Full textSafi, Zikrullah [Verfasser]. "Nutrient cycling and nutrient use efficiency in urban and peri-urban agriculture of Kabul, Afghanistan / Zikrullah Safi." Kassel : Universitätsbibliothek Kassel, 2011. http://d-nb.info/1012867978/34.
Full textAndersson, Rasmus, and Viktor Wahrenberg. "Sambandet mellan delta efficiency i cykling och löpning för elitaktiva triathleter." Thesis, Högskolan Dalarna, Idrotts- och hälsovetenskap, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:du-36489.
Full textPurposeThe purpose of the present study was to investigate the relationship between delta efficiency (DE) in cycling (DEcycle) and running (DErun) among elite triathletes. Furthermore, another aim of the study was to investigate if DE differ between the activities and/or gender.MethodsFive elite female (22 ± 6 years) and five elite male (24 ± 5 year) triathletes preformed two submaximal tests, a cycling test and a running test on a motorized treadmill in a constant inclination of 2,5˚. The treadmill speed between stages was increased by 2.4 km·h-1 for the cycling test and 0.6 km·h-1 for the running test. Each stage was five minutes followed by a one minute pause. DE is the relation between the change in work rate (WR) and the change in metabolic rate (MR), presented in percentages. The triathletes own bikes and running equipment were used during the tests.ResultsThe results did not show a relationship between DEcycle and DErun between elite triathletes (p > 0,05). A statistical significant difference was found between DEcycle and DErun (p < 0,001). No gender difference was found for either DEcycle or DErun (both p > 0,05).ConclusionsThe DEcycle were significantly higher among the triathletes compared to DErun. No relationship between DEcycle and DErun were found, which means that triathletes with a grate DEcycle does not automatically have a grate DErun. No gender related difference was discovered between the triathletes.
Aguiar, Maria Ivanilda de. "Productivity, nutrient cycling and emergy efficiency as functions of plant diversity in agricultural systems and preserved caatinga vegetation." Universidade Federal do CearÃ, 2012. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=8884.
Full textNutrient cycling and energy transformation processes fuel plant productivity and are directly related to ecosystem diversity. The preservation of diversity has thus been identified as a way to improve the sustainability of agroecosystems. It also follows that agroforestry systems (AFS) are recommended since they maintain high plant diversity, increase carbon and nutrient stocks and promote emergy efficiency. Agroforestry systems represent an alternative to traditional agricultural systems, which are responsible for large losses of diversity and environmental degradation in Brazilâs semiarid northeast. It is assumed that the greater plant diversity in AFS yields greater productivity, improves soil nutrient inputs, and increases carbon and nutrient stocks as well as energy efficiency. We evaluated a model agroforestry production system consisting of three areas: agrosilvopastoral, silvopastoral and preserved caatinga vegetation (CAT). Also, data was taken from a traditional management system including an area under cropping and two areas under fallow for six and nine years. The objectives of this work were to assess whether AFS remain similar to preserved vegetation and whether fallow periods restore land to its initial condition, in terms of: (i) the species composition and community structure of herbaceous and tree/shrub strata; (ii) plant diversity and biomass production; (iii) carbon and nutrient stocks in standing vegetation, litter and the soil and (iv) emergy flux transformations. We found that species composition and plant productivity were similar in the AFS and preserved caatinga, however in AFS the structure of the plant community was modified and diversity indices were reduced. Soil carbon and nutrient stocks in AFS were similar to those in CAT, but stocks in standing biomass and litter were lower. Overall, the AFS performed better in terms of emergy, due to more efficient energy use, a lesser environmental impact and greater renewability. The fallow periods following traditional cropping allowed the species composition, productivity and carbon and nutrient stocks in soil and litter to recover. However, areas under fallow differed from CAT in terms of tree community structure, with a greater number of individuals and species. Tree species found in fallow areas reach smaller sizes than under CAT. Therefore total biomass and carbon and nutrient stocks were lesser under fallow than CAT. Agroforestry systems managed in an integrated fashion represent great potential for sustainability, since they provide agricultural, pastoral and wood products while maintaining vegetation structure characteristics which allow constant fluxes of energy and nutrient cycling, as occurs under preserved vegetation.
Os processos de ciclagem de nutrientes e transformaÃÃes energÃticas impulsionam a produtividade e estÃo diretamente relacionados com a diversidade dos ecossistemas. Assim, tem-se priorizado a manutenÃÃo da diversidade em Ãreas agrÃcolas para a conduÃÃo de agroecossistemas mais sustentÃveis. Neste sentido, os sistemas agroflorestais (SAFs) sÃo recomendados por manter elevados nÃveis de diversidade vegetal, aumentar os estoques de carbono e nutrientes e promover eficiÃncia nas transformaÃÃes energÃticas. Os SAFs sÃo indicados para substituÃr os sistemas agrÃcolas tradicionais responsÃveis por grande perda de diversidade e degradaÃÃo ambiental na regiÃo semiÃrida nordestina. Espera-se que nos SAFs, a maior diversidade vegetal proporcione maior produtividade, maior retorno de nutrientes ao solo, maiores estoques de carbono e nutrientes e melhor eficiÃncia emergÃtica. Um modelo de produÃÃo agroflorestal composto de trÃs Ãreas foi avaliado: agrossilvipastoril (ASP), silvipastoril (SP) e caatinga conservada (CAT); e um sistema de manejo tradicional, composto de uma Ãrea em cultivo (AG), e duas Ãreas em pousio de seis (P6) e nove (P9) anos. Este trabalho objetivou verificar se os SAFs mantÃm-se semelhantes a vegetaÃÃo conservada e se os perÃodos de pousio retornam as Ãreas a sua condiÃÃo inicial, quanto a: (1) composiÃÃo florÃstica e estrutura da comunidade dos componentes herbÃceos e arbÃreo/arbustivo; (2) diversidade e produÃÃo de biomassa; (3) estoques de carbono e nutrientes presentes nas plantas, serrapilheira e solo e (4) transformaÃÃes dos fluxos emergÃticos. Verificou-se que as Ãreas sob SAFs apresentam composiÃÃo florÃstica e produtividade semelhante a caatinga conservada, porÃm este manejo provoca modificaÃÃes estruturais na comunidade vegetal e reduÃÃo nos Ãndices de diversidade. Os estoques de carbono e nutrientes nos SAFs sÃo semelhantes a CAT no compartimento solo, porÃm foram inferiores nas plantas e na serrapilheira. Contudo, o modelo agroflorestal apresenta melhor desempenho emergÃtico devido sua melhor eficiÃncia na utilizaÃÃo de energia, menor impacto ambiental e maior renovabilidade. Durante os perÃodos de pousio adotados apÃs o cultivo tradicional as Ãreas se recuperaram em relaÃÃo a composiÃÃo florÃstica, a produtividade e os estoques de carbono e nutrientes no solo e na serrapilheira. Entretanto, apresentaram modificaÃÃes quanto a estrutura da comunidade arbÃrea, com maior nÃmero de indivÃduos e espÃcies, sendo estes de menor porte e assim, menor biomassa total e menor estoques de carbono e nutrientes. Os sistemas de produÃÃo agroflorestal utilizados de forma integrada apresentam grande potencial de sustentabilidade, por proporcionarem a produÃÃo agrÃcola, pastoril e madeireira, mantendo diversas caracterÃsticas estruturais da vegetaÃÃo que permitem um fluxo de energia e uma ciclagem de nutrientes constante, assim como em Ãreas conservadas.
BURNS, Jack, and jack burns@ecu edu au. "Does training with PowerCranks(tm) affect economy of motion, cycling efficiency, oxygen uptake and muscle activation patterns in trained cyclists?" Edith Cowan University. Computing, Health And Science: School Of Exercise, Biomedical & Health Science, 2008. http://adt.ecu.edu.au/adt-public/adt-ECU2008.0017.html.
Full textHarris, Kevin W. "The effects of the powercam crank system on physiological and perceptual indicators of efficiency in humans during endurance cycling." Thesis, Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/94461.
Full textM.S.
Burns, Jack. "Does training with PowerCranks™ affect economy of motion, cycling efficiency, oxygen uptake and muscle activation patterns in trained cyclists?" Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2008. https://ro.ecu.edu.au/theses/17.
Full textMarwede, Max [Verfasser], and Armin [Akademischer Betreuer] Reller. "Cycling critical absorber materials of CdTe- and CIGS-photovoltaics: Material efficiency along the life-cycle / Max Marwede. Betreuer: Armin Reller." Augsburg : Universität Augsburg, 2013. http://d-nb.info/1077703074/34.
Full textTsujii, Yuki. "Significance of the phosphorus-use strategies of trees for the cycling of phosphorus in Bornean tropical rainforest ecosystems." Kyoto University, 2018. http://hdl.handle.net/2433/232348.
Full text0048
新制・課程博士
博士(農学)
甲第21147号
農博第2273号
新制||農||1058(附属図書館)
学位論文||H30||N5121(農学部図書室)
京都大学大学院農学研究科地域環境科学専攻
(主査)教授 北山 兼弘, 教授 小杉 緑子, 教授 北島 薫
学位規則第4条第1項該当
Goldstein, Renee B. "Comparison of Prototype Bicycle Pedal VS Traditional, Fixed Pedal and it's Effect on Efficiency and Power Output." Cleveland State University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=csu1304519913.
Full textCarlsson, Marie. "Sambandet mellan rörelseekonomin vid cykling och löpning för elitaktiva triathleter." Thesis, Högskolan Dalarna, Idrotts- och hälsovetenskap, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:du-36493.
Full textPurposeThe aim of this study was to investigate whether there is a correlation between gross efficiency (GE) in cycling and running among elite triathletes. Furthermore, this study aims to investigate if there is a difference between GE in cycling and running and whether there is any gender difference in GE for these two different forms of activity.MethodsThe participants (5 women, 5 men) (23 ± 7.5 years) performed a cycle test and a running test to determine the participants’ GE. The treadmill inclination was set to 2.5º and the intensity levels lasted five minutes with one minute standing rest. For each new level, the speed increased by 2.4 km∙h-1 in the cycling test and 0.6 km∙h-1 in the running test. During the tests, the participants’ oxygen uptake was analysed and a lactate sample was taken immediately after the completed level. The participants’ GE was calculated based on the relative work intensity where the lactate concentration increased 1 mmol∙l-1 from the lowest measured value. Pearson's correlation, independent samples t-test and paired sample t-test were conducted to identify relationship, gender differences, and difference in GE between the activity forms, respectively. The alpha level for statistical significance was set to 0.05.ResultsThere was a significant correlation between GE in cycling and running (p = 0.041). There was no significant gender difference in GE for either cycling (p = 0.59) or running (p = 0.31). However, GE in cycling was higher than in running (p < 0,001).ConclusionsA triathlete with high GE in cycling generally has a high GE in running, despite that these forms of activity differ both coordinatively and from a GE perspective.
Cockcroft, Stephen John. "An evaluation of inertial motion capture technology for use in the analysis and optimization of road cycling kinematics." Thesis, Stellenbosch : University of Stellenbosch, 2011. http://hdl.handle.net/10019.1/6760.
Full textENGLISH ABSTRACT: Optical motion capture (Mocap) systems measure 3D human kinematics accurately and at high sample rates. One of the limitations of these systems is that they can only be used indoors. However, advances in inertial sensing have led to the development of inertial Mocap technology (IMCT). IMCT measures kinematics using inertial measurement units (IMUs) attached to a subject's body without the need for external sensors. It is thus completely portable which opens up new horizons for clinical Mocap. This study evaluates the use of IMCT for improving road cycling kinematics. Ten male sub-elite cyclists were recorded with an IMCT system for one minute while cycling at 2, 3.5 and 5.5 W.kg-1 on a stretch of road and on a stationary trainer. A benchmark test was also done where cycling kinematics was measured simultaneously with the IMCT and a gold-standard Vicon optical system. The first goal was to assess the feasibility of conducting field measurements of cycling kinematics. Magnetic analysis results showed that the IMUs near the pedals and handlebars experienced significant magnetic interference (up to 50% deviation in intensity) from ferrous materials in the road bicycles, causing significant errors in kinematic measurement. Therefore, it was found that the IMCT cannot measure accurate full-body kinematics with the subject on a road bicycle. However, the results of the benchmark test with the Vicon showed that the IMCT can still measure accurate hip (root mean square error (RMSE) < 1°), knee (RMSE < 3.5°) and ankle (RMSE < 3°) flexion using its Kinematic Coupling algorithm. The second goal was to determine whether there is a significant difference between road cycling kinematics captured on the road and in a laboratory. The outdoor flexion results were significantly different to the indoor results, especially for minimum flexion (P < 0.05 for all joints). Changes in rider kinematics between high and low power were also found to have significantly more variability on the road (R2 = 0.36, 0.61, 0.08) than on the trainer (R2 = 0.93, 0.89, 0.56) for the hip, knee and ankle joints respectively. These results bring into question the ecological validity of laboratory cycling. Lastly, applications of IMCT for optimizing cycling performance were to be identified. Several aspects of kinematic analysis and performance optimization using the IMCT were evaluated. It was determined that IMCT is most suited for use as a dynamic bicycle fitting tool for analysis of biomechanical efficiency, bilateral asymmetry and prevention of overuse injuries. Recommendations for future work include the elimination of the magnetic interference and integration of the IMCT data with kinetic measurements to develop an outdoor dynamic fitting protocol.
AFRIKAANSE OPSOMMING: Optiese bewegingswaarnemingstelsels (BWS) meet drie-dimensionele menslike kinematika met hoë akkuraatheid en teen hoë monstertempo's. Een van die nadele van BWS is dat hulle slegs binnenshuis gebruik kan word. Onlangse ontwikkelings in sensor tegnologie het egter gelei na die beskikbaarheid van traagheids-BWS-tegnologie (TBT). TBT gebruik traagheidsmetingseenhede (TMEs) wat aan 'n persoon se liggaam aangeheg kan word om die kinematika te verkry sonder enige eksterne sensore. TBT is dus volkome draagbaar, wat nuwe geleenthede skep vir kliniese bewingsanalises. Hierdie projek evalueer die gebruik van TBT vir die verbetering van fietsry kinematika. Tien kompeterende fietsryers (manlik) was getoets met 'n TBT terwyl hulle teen 2, 3.5 and 5.5 W.kg-1 gery het op 'n pad, en op 'n stilstaande oefenfietsraam. 'n Maatstaftoets was ook uitgevoer waar fietsry-kinematika gelyktydig met die TBT en die Vicon optiese BWS opgeneem was. Die eerste doel van die navorsing was om die moontlikheid te ondersoek of fietsryer kinematika op die pad gemeet kan word. Die resultate toon dat die ferro-magnetiese materiale wat in meeste padfietse voorkom, 'n beduidende magnetiese steuring (tot 50% afwyking in intensiteit) op die TMEs naby die pedale en handvatsels veroorsaak, wat lei tot aansienlike foute in die kinematiese metings. Gevolglik was dit gevind dat die TBT nie volle-liggaam kinematika op 'n fiets kan meet nie. Nogtans, het die resultate van die Vicon maatstaftoets bewys dat die TBT nog steeds akkurate heup (wortel van die gemiddelde kwadraad fout (WGKF) < 1°), knie (WGKF < 4°) en enkel (WGKF < 3°) fleksie kan meet met die “Kinematiese Koppeling” algoritme. Die tweede doel was om te bepaal of daar 'n beduidende verskil tussen die laboratorium en pad fietsry-kinematika is. Die buitelug fleksie data het beduidend verskil van die binnenshuise resultate, veral vir minimum fleksie (P < 0.05 vir alle gewrigte). Veranderinge in fietsryer kinematika tussen hoë en lae krag het ook beduidend meer variasie op die pad (R2 = 0.36, 0.61, 0.08) as op die oefenfietsraam (R2 = 0.93, 0.89, 0.56) vir die heup, knie en enkel gewrigte, onderskeidelik, gehad. Hierdie resultate bevraagteken die ekologiese geldigheid van kinematiese toetse op fietsryers in 'n laboratorium. 'n Laaste doel was om die toepassings van TBT vir die optimering van fietsry kinematika te ondersoek. 'n Verskeidenheid aspekte van die analise en verbetering van fietsry kinematika met die TBT word bespreek. Die gevolgtrekking is dat TBT geskik is vir gebruik as 'n dinamiese instrument vir die analise van biomeganiese doetreffendheid, bilaterale asimmetrie en die voorkoming van beserings. Aanbevelings vir toekomstige werk, sluit in die uitskakeling van die magnetiese inmenging, asook die integrasie van die TBT data met kinetiese metings.
Sciullo, Luca. "Energy-efficient wireless sensor networks via scheduling algorithm and radio Wake-up technology." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/14539/.
Full textHardiman, Brady S. "Resilience of Forest Carbon Storage through Disturbance and Succession." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1339686584.
Full textFriedl, Johannes. "Denitrification losses from intensively managed pastures in the subtropics: Key controls and mitigation." Thesis, Queensland University of Technology, 2017. https://eprints.qut.edu.au/108060/1/Johannes_Friedl_Thesis.pdf.
Full textFigueira, Thiago Gomes. "Efeitos fisiológicos do treinamento unipodal em cicloergômetro com e sem irradiação LED." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/82/82131/tde-20082018-153447/.
Full textThe improvement in physical capacity and/or functional reserve is due to, among other factors, a systematic and organized training program. Aerobic exercise is a frequently used modality in a training program, especially among those who aim to improve physical fitness. However phototherapy has currently gained space in regard to improving the performance of athletes. Based on this information, the purpose of the study was to verify the effect of one-legged cycling, LED therapy and their association on ergospirometric parameters of performance (VO2max, AT and RCT) and on blood concentration of CK. 24 male subjects volunteered for the study and were submitted to a pre-intervention evaluation and an 8-week period of one-legged cycling with LED therapy or placebo. After the intervention period subjects were submitted to a second evaluation. An arrangement containing 50 LEDs and a wavelength of 850 nm was applied during 60 seconds after each training session. Volunteers were divided into the following experimental groups: untrained and LED off (ULOf), untrained and LED on (ULOn), trained and LED off (TLOf) and trained and LED on (TLOn). The leg that received the intervention (training and/or LED therapy) was selected randomly and named active leg (A) and the contralateral limb was named control (C). During the incremental exercise test to volitional failure the ergospirometric variables ventilation (Ve), oxygen uptake (VO2) and oxygen ventilatory equivalent (EqVO2) were measured and blood samples were collected after each stage for lactate and before and 24 hours after the test for the analysis of blood CK. Acute responses from the pre-intervention evaluation showed that the intensity of one-legged cycling led to lower intensity, VO2, Ve, blood lactate and higher increase in blood CK compared to traditional cycling (two-legged). After the 8 weeks of intervention, the active leg showed improvements in the measured variables for the TLOn, ULOn and TLOf groups and, in some of the variables for the groups that received LED therapy. With these data we conclude that one-legged cycling is capable of increasing parameters such as intensity, ventilation, oxygen uptake, aerobic efficiency and minimizes the blood CK responses to exercise in the exercised limb. The association between exercise and Led therapy potentiates the effects achieved with either of the interventions.
Goodrich-Stuart, Ellen. "Forest Net Primary Production Resistance Across a Gradient of Moderate Disturbance." VCU Scholars Compass, 2014. http://scholarscompass.vcu.edu/etd/627.
Full textWang, Lingjuan. "Theoretical study of cyclone design." Diss., Texas A&M University, 2003. http://hdl.handle.net/1969.1/2192.
Full textVincent, Raymond A. Jr. "Efficiency analysis of the cyclone separator using CFD techniques." Thesis, Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/17372.
Full textAdebare, Adedeji. "Optimizing the efficiency of cylindrical cyclone gas/liquid separators for field applications." Texas A&M University, 2006. http://hdl.handle.net/1969.1/4417.
Full textLans, Patrik. "Numerical Methods for Simulating Separation in a Vacuum Cleaner Cyclone." Thesis, KTH, Mekanik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-194498.
Full textPažourek, Josef. "Cyklonový odlučovák pro velmi malé částice." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-417432.
Full textKunapareddy, Naveen. "A Proof-of-Concept Test for Seperation Efficiency of an Electro-Cyclone." Ohio University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1237569168.
Full textTitscher, Thomas. "Efficient computational mesoscale modeling of concrete under cyclic loading." Doctoral thesis, Universitat Politècnica de Catalunya, 2019. http://hdl.handle.net/10803/667647.
Full textEl hormigón es un material complejo y puede ser modelado en varias escalas espaciales y temporales. Mientras que las simulaciones en escalas gruesas son prácticas para aplicaciones de ingeniería, se obtiene una comprensión más profunda del material en escalas más finas. Esto es a costa de un mayor esfuerzo numérico que puede ser reducido por los tres métodos desarrollados y utilizados en este trabajo, cada uno de los cuales corresponde a una publicación. La escala espacial gruesa está relacionada con modelos totalmente homogeneizados. El material se describe con un enfoque fenomenológico y los numerosos parámetros a veces carecen de significado físico. La resolución de la estructura mesoscópica trifásica formada por los áridos, la matriz de mortero y las interfaces entre ellos permite describir efectos similares con modelos más sencillos. Este trabajo aborda dos retos computacionales relacionados con el modelado a mesoescala. En primer lugar, las partículas agregadas absorben una fracción de gran volumen y se requiere un algoritmo eficiente de empaquetamiento de partículas para generar mesoestructuras aleatorias que no se solapen. Hacer cumplir una distancia adicional entre los agregados es esencial para obtener mallas no distorsionadas para simulaciones de elementos finitos, pero complica aún más el problema de empaquetado. A este problema se le aplica un algoritmo de dinámica molecular impulsado por eventos que, a diferencia de los métodos tradicionales, permite el movimiento y una disposición densa de los agregados. Esto permite crear mesoestructuras de hormigón con fracciones de volumen de agregado realistas. El segundo reto se refiere a los problemas de estabilidad en las simulaciones mesoescalares de fracturas de hormigón. La complejidad geométrica y la combinación de tres leyes materiales para cada una de las fases conduce a inestabilidades numéricas, incluso para modelos materiales regularizados. Esto requiere pequeños pasos de tiempo y numerosas iteraciones por paso de tiempo cuando se integra con un esquema clásico de Euler hacia atrás. La integración implícita- explícita (IMPL-EX) extrapola variables internas que dan cuenta del comportamiento no lineal. Esto linealiza las ecuaciones, proporciona robustez adicional y una aceleración computacional. En combinación con un nuevo método de control de paso en el tiempo, una prueba de compresión tridimensional de mesoescala es acelerada por un factor de 40, en comparación con un algoritmo adaptativo de Euler hacia atrás. La vida útil del hormigón bajo cargas cíclicas se predice comúnmente con las líneas empíricas de Wöhler. Relacionan el número de ciclos soportados con la amplitud de carga aplicada y pueden ser incluidos en formulaciones constitutivas. Sin embargo, difícilmente pueden generalizarse a geometrías y configuraciones de carga distintas a las probadas. En una escala temporal más fina, la falla por fatiga es modelada por la acumulación de daño dentro de cada ciclo de carga. Esto resuelve todo el proceso de fracaso, incluye redistribuciones de estrés y efectos de tamaño, y puede extenderse fácilmente a fenómenos multifísicos. El tercer reto computacional resuelto aquí es la integración temporal eficiente que no sería factible en una integración costosa de miles o millones de ciclos ciclo a ciclo. El costo de evaluar un solo ciclo se reduce reformulando el problema en el espacio de frecuencias. Es suficiente equilibrar la estructura una vez para cada coeficiente de Fourier, lo que acelera significativamente esta evaluación. El daño acumulado de un ciclo se integra en el tiempo utilizando un concepto de salto de ciclo adaptativo. Para una estructura de prueba de vacío bidimensional, la combinación de ambas técnicas conduce a una simulación 25 veces más rápida en comparación con la integración completa.
Kegg, Steve W. "A Numerical Investigation of Gas Cyclone Separation Efficiency with Comparison to Experimental Data and Presentation of a Computer-Based Cyclone Design Methodology." University of Akron / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=akron1216912969.
Full textYusuf, Ahmed A. "The study of down-hole hydro-cyclone efficiency in oil wells using computational fluid dynamics." Morgantown, W. Va. : [West Virginia University Libraries], 2006. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4886.
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Alfarah, Bashar. "Advanced computationally efficient modeling of RC structures nonlinear cyclic behavior." Doctoral thesis, Universitat Politècnica de Catalunya, 2017. http://hdl.handle.net/10803/454783.
Full textEl comportamiento estructural de edificios y otras construcciones bajo severas excitaciones sísmicas es muy complejo e implica temas como, la interacción suelo-estructura, grandes esfuerzos y desplazamientos, daños, plasticidad y el comportamiento de la estructura cerca del colapso. Por otra parte, en estructuras de hormigón armado, existen varios modos de fallo y de degradación: agrietamiento, aplastamiento y desprendimiento del hormigón, plastificación y extracción de las armaduras traccionadas y plastificación y pandeo de las armaduras comprimidas. Además, otras circunstancias hacen que la situación sea más alarmante: dada la creciente conciencia y preocupación por el enorme riesgo sísmico mundial, la ingeniería sísmica ha experimentado en los últimos años avances sustanciales, para lo cual se han propuesto nuevas estrategias de análisis y diseño, lo que conduce a desarrollos relevantes. Estos desarrollos se basan en pruebas y simulaciones numéricas basadas principalmente en modelos simplificados referidos en este trabajo como modelo basados en la estructura, resultando un costo computacional moderado. Por lo tanto, existen una gran necesidad de verificar la fiabilidad de los nuevos desarrollos en comparación con los análisis realizados utilizando herramientas de simulación más avanzadas y con ensayos. Este trabajo se organiza en dos partes; en la primera se describe un modelo preciso basado en la mecánica del medio continuo y en la segunda se presenta otro modelo más simplificado basado en los componentes de la estructura. Primera parte. En esta parte se desarrolla un nuevo modelo basado en la mecánica del medio continuo para simular el comportamiento monotónico y cíclico de estructuras de hormigón armado. El modelo desarrollado combina una nueva metodología para el cálculo de las variables del daño en el Modelo de Daño Plástico del Hormigón “CPDM”, y un nuevo enfoque para integrar el CPDM con un modelo de interface de 3-D desarrollado en otra investigación. También se presenta un nuevo esquema para implementar la interfaz del modelo en un modelo FEM continuo de regiones con armaduras que se cruzan en varias direcciones. La precisión, la fiabilidad y la insensibilidad a la malla del modelo propuesto se verifican simulando varias pruebas incrementales y cíclicas; los resultados obtenidos se comparan con experimentales, lográndose un ajuste satisfactorio. Segunda parte. El modelo desarrollado in el Primer Parte ha sido comparado con modelos simplificados basados en los componentes estructurales de uso común en la ingeniería sísmica, los resultados mostraron la superioridad del modelo pro-puesto para predecir el comportamiento real de los elementos y pórticos RC altamente dañados, capturando la reducción de la resistencia, la degradación de la rigidez y el efecto pinzamiento (“pinching”). Sin embargo, algunos de los modelos basados en componentes estructurales han mostrado un desempeño aceptable teniendo en cuenta el costo computacional de la ley en comparación con el modelo avanzado basado en la mecánica del medio continuo. Con de esta conclusión, este parte de este trabajo presenta un estudio numérico sobre la relación entre los modos de deterioro no-simulados de pórticos de hormigón sin ductilidad y su capacidad última. Se ha desarrollado un modelo avanzado basado en los componentes de la estructura para simular el comportamiento dinámico no lineal de las estructuras sin ductilidad, teniendo en cuenta los modos de deterioro de flexión, corte y axial. El modelo desarrollado es numéricamente eficiente, siendo pues adecuado para el uso profesional en ingeniería sísmica. La capacidad del modelo desarrollado se verifica mediante la simulación del comportamiento dinámico no lineal de un edificio no dúctil existente y del edificio prototipo.
Tom, Caroline Carleton University Dissertation Engineering Electronics. "Investigation and implementation of computationally-efficient algorithm for cyclic spectral analysis." Ottawa, 1995.
Find full textBjörk, Erik. "Energy Efficiency Improvements in Household Refrigeration Cooling Systems." Doctoral thesis, KTH, Tillämpad termodynamik och kylteknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-93061.
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Lagemann, Benjamin. "Efficient seakeeping performance predictions with CFD." Thesis, KTH, Marina system, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-261772.
Full textTack vare den stadigt ökande beräkningskraften kan beräkningsuiddynamik (CFD) idag användas på beräkningsintensiva problem som sjöegenskapssimulationer. Den här rapporten undersöker användning av CFD på sjöegenskapsprestanda och syftar till att foreslå ett best-practice förfaringssätt för effektiv sjöegenskapssimulationer. Forskningsskrovet KVLCC2 fungerar som ett testfall för denna rapport och FINE/Marine-mjukvarupaketet används för CFD-beräkningar. Viktiga parametrar, såsom ödestyp, beräkningsnät och tidssteg varierars systematiskt. Resultaten jämförs med experiment gjorda vid SSPA. Baserat på resultaten förelås en best-practice. Den föreslagna best-practice användas vidare för berökningar av sjöegenskaper i sneda vågor. Jämförelse av resultaten med liknande studier visar god överensstämmelse. Genom att använda det föreslagna förfarandet för best-practice kan CFD-sjöegenskapssimulationer användas på fall där viskösa krafter måste beaktas, till exempel rörelseregleringsanordningar.
Sami, Abdul Wahab. "Area Efficient ADC for Low Frequency Application." Thesis, Linköpings universitet, Elektroniska Kretsar och System, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-117413.
Full textKasarabada, Yasaswy. "A Verilog Description and Efficient Hardware Implementation of the Baillie-PSW Primality Test." University of Cincinnati / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1471347471.
Full textOlagunju, Moses Oladipo. "A study of efficient recovery of liquid from fine air-liquid mists of the form generated in gas turbine bearing chambers using rotating porous disc." Thesis, University of East London, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.265060.
Full textLazarevic, Ljubica. "Improving the efficiency and accuracy of nocturnal bird Surveys through equipment selection and partial automation." Thesis, Brunel University, 2010. http://bura.brunel.ac.uk/handle/2438/4155.
Full textSUMIYA, LUIZ C. do A. "Estudo de parâmetros relevantes na irradiação de sup(124)Xe, visando a otimização na obtenção de sup(123)I ultra puro no ciclotron cyclone-30 IPEN-CNEN/SP." reponame:Repositório Institucional do IPEN, 2006. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11477.
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Thakkar, Amit. "Combinatorial Synthesis, Sequencing, and Biological Applications of Peptide and Peptidomimetic Libraries." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1259775104.
Full textKolios, Grigorios [Verfasser], and Gerhart [Akademischer Betreuer] Eigenberger. "Regenerative fixed-bed processes : approximative analysis and efficient computation of the cyclic steady state / Grigorios Kolios. Betreuer: Gerhart Eigenberger." Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2014. http://d-nb.info/1058106260/34.
Full textDudal, Clément. "Forme d'onde multiporteuse pour de la diffusion par satellite haute capacité." Phd thesis, Toulouse, INPT, 2012. http://oatao.univ-toulouse.fr/8342/1/dudal.pdf.
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