Literatura científica selecionada sobre o tema "Freon ban"
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Artigos de revistas sobre o assunto "Freon ban":
Azmi, Azmi. "Pemanfaatan Limbah Kulkas Dan Tabung Freon Untuk Membuat Kompressor". JURNAL UNITEK 11, n.º 1 (11 de agosto de 2020): 61–69. http://dx.doi.org/10.52072/unitek.v11i1.29.
MORENO GARCÍA, Javier. "La alta conflictividad sobre los tributos propios autonómicos ante el Tribunal Constitucional: un problema no resuelto." RVAP 115, n.º 115 (30 de dezembro de 2019): 289–313. http://dx.doi.org/10.47623/ivap-rvap.115.2019.08.
Cirak, Cuneyt, e Alessandra Bertoli. "Aromatic profiling of wild and rare species growing in Turkey:Hypericum aviculariifoliumJaub. and Spach subsp. depilatum(Freyn and Bornm.) Robson var.depilatumandHypericum pruinatumBoiss. and Bal." Natural Product Research 27, n.º 2 (janeiro de 2013): 100–107. http://dx.doi.org/10.1080/14786419.2012.660633.
Gautier, Axel. "Numéro 22 - juin 2004". Regards économiques, 12 de outubro de 2018. http://dx.doi.org/10.14428/regardseco.v1i0.16053.
Gautier, Axel. "Numéro 22 - juin 2004". Regards économiques, 12 de outubro de 2018. http://dx.doi.org/10.14428/regardseco2004.06.01.
Teses / dissertações sobre o assunto "Freon ban":
Ringlander, Evelina. "Freonförbudet – Varför lyckades detta globalt och är detta tillämpbart idag på en liknande gas?" Thesis, Linköpings universitet, Institutionen för fysik, kemi och biologi, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-174565.
Freons became a large problem for society when scientists proved the ozone depletion effect, which proved to have a negative effect on human health and other living organisms. The ozone layer which was known for its protective qualities against UV-radiation lead to a new field of study, ODS (ozone depleting substances). The warnings from the scientist society and the public were eminent. The research pointed out, among other things, the increasing risk of skin cancer. This forced fast new research and several international conventions to save the ozone layer. But there are several greenhouse gases, which also have the degrading effect on the ozone layer, that are in use today. This require an international cooperation for the environment to be able to solve. The aim of this report was to illustrate why the freon ban was a success and why it would be hard to implement these key concepts on a similar present greenhouse gas. In this literature study, several databases were used to find relevant sources for the main questions and unbiased for the topic. The key aspects in this study is presented in the result section. The result pointed at the difficulties with implementing the same way of work as at the freon ban to the greenhouse gas ban. Different aspects play an important role in this, but one of the greater difficulties for implementing this is to pinpoint it to a specific source for gas emissions and finding a sustainable solution for it. The correlation between human health and environmental issues was a key factor in the freon ban.
Corradi, Grégoire. "Approches numérique et expérimentale pour des structures à interfaces frottantes : Application au crissement de frein". Thesis, Lyon, 2019. http://www.theses.fr/2019LYSEC044.
Brake systems are sometimes prone to squeal noise, which is due to friction-induced self-sustained vibrations, characterized by a set of frequencies above 1kHz. Those vibrations and resulting noises are a source of perturbations for car occupants, which can be nowadays considered as a health issue.This thesis deals with a global strategy to better understand this phenomenon from an experimental point of view and to propose the prediction of squeal noise by numerical approaches. Moreover, experimental observations of squeal occurrences are analyzed to lead to assumptions about the modelisation of numerical finite element models for squeal prediction. A Double Modal Synthesis is also applied to reduce the size of the discrete finite element model of brake system and to save computational time and ressources. The proposed numerical approach starts with a stability analysis with the classical CEA method. Then the determination of nonlinear self-excited vibrations are performed for the unstable cases detected via the CEA method. Finally the acoustic field emitted by the brake system is computed to predict squeal noise.Specific tools are applied for each computational step to assess the efficiency of reduced model versus the reference model: criteria based on the mean error on eigenvalues and the Modal Assurance Criterion analysis (MAC) are used for the stability analysis; comparisons of the limit cycles, spectrograms and the modal contributions of unstable modes are undertaken for the transient responses; patterns of the acoustic intensity are computed on several observations surfaces and a decomposition based on the theory of 2D wavelets is introduced and applied to assess the convergence of patterns
Philippe, Florian. "Mesure et caractérisation des particules issues du freinage dans l’automobile sur un banc pion-disque". Thesis, Compiègne, 2021. http://www.theses.fr/2021COMP2615.
Brake wear gives around 50% by mass to total non-exhaust traffic related PMI 0 emissions in urban environments. While engines have become cleaner in the past decades, few improvements were made to lowe non-exhaust emission until recently. Researchers have developed several experimental methods over the past years to assess brake emissions. However, observations tend to differ from a method to another with respect many disciplines, ranging from particle system characterization to brake cycles, and it remains difficult to compare results of different research groups sucha s UNECE PMP or LOWBRASYS. Literature describes two methods to simulate braking in laboratory : inertia dynamometric bench and pin-on-dis bench. Most of studies on braking emissions were performed on dynomometric bench. However, dynamometric bench need a high investment. This thesis looks after the possibility to caracterise and measure braking emissions on a much more affordable setup : pin-on-disc. The new developped experimental setup will then allow cost saving studies while adding experience and knowledge to working group discussions. After a bibliographic study and visits of different benchs (TECSA in Turin — Italy and KTH, Stockholm — Suède), the CETIM TGV pin-on-disc bench has been adapted to the measurement and to the caracterisation of braking emissions. This new experimental setup has firstly shown an efficient isolation from the external environment with very low measured concentrations. Emissions linked to friction events were then measured with size distributions comparable to those seen on dynamometric benchs. In order to optimize results from the new bench, further studies were performed. The first step done was to increase measured particle number to limit insturmentation and transport uncertainties influences. Influence of tribological parameters such as sliding speed, contact pressure and friction surface were hence studied. Parametric studies were also performed on the following experimental parameters : airflow and test timing configuration. The second step was to improve repeatibility of tests and their measured emissions. Studying surfaces allowed to a better understanding of generation mechanisms which in the end led to a repeatability improvement. Lastly, the number ofparticles emitted during a single friction has been chosen as output value. A data protocol has thus been developped and a relevant instrumentation has been defined. Thanks to the performed studies, an experimental measurement protocole which determine emissivity of braking material has been defined for the CETIM pin-on-disc. An experimental study was performed lately and showed the possibility to study braking material emissivity on this bench. The pin-on-disc bench remains a theoretical bench, new studies about generation mechanisms understanding can be done. Those news studies and their results could extend to other domain, like railwa which share the same brakin emission problematic
Trabalhos de conferências sobre o assunto "Freon ban":
Mohany, Atef, Victor P. Janzen, Paul Feenstra e Shari King. "Experimental and Numerical Characterization of Flow-Induced Vibration of Multi-Span U-Tubes". In ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting collocated with 8th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2010. http://dx.doi.org/10.1115/fedsm-icnmm2010-31103.
Mohany, Atef, e Victor Janzen. "Flow-Induced Vibration and Fretting-Wear Performance of CANDU™ Steam Generator U-Tubes: Instrumentation". In ASME 2009 Pressure Vessels and Piping Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/pvp2009-78076.
Feenstra, Paul A., Victor P. Janzen e Bruce A. W. Smith. "In-Plane Vibration Damping of a U-Tube With Wet and Dry Flat-Bar Supports". In ASME 2014 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/pvp2014-28429.
Feenstra, Paul, Teguewinde Sawadogo, Bruce Smith, Victor Janzen e Helen Cothron. "Investigations of In-Plane Fluidelastic Instability in a Multi-Span U-Bend Tube Bundle: Tests in Air Flow". In ASME 2017 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/pvp2017-66068.
Feenstra, Paul, Teguewinde Sawadogo, Bruce Smith, Victor Janzen, Anne McLellan, Helen Cothron e Sean Kil. "Investigations of In-Plane Fluidelastic Instability in a Multi-Span U-Bend Test Rig: Tests in Two-Phase Flow". In ASME 2019 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/pvp2019-93729.