Llibres
http://hdl.handle.net/2117/3999
2024-03-29T02:18:36ZApplications of Industrial Mathematics; 158th European Study Group with Industry, Barcelona, Spain, January 2731, 2020
http://hdl.handle.net/2117/393233
Applications of Industrial Mathematics; 158th European Study Group with Industry, Barcelona, Spain, January 2731, 2020
Aguareles Carrero, María; Font Martínez, Francesc; Myers, Timothy G.; Pellicer, Marta; Solà-Morales Rubió, Joan de
2023-09-07T11:40:44ZAguareles Carrero, MaríaFont Martínez, FrancescMyers, Timothy G.Pellicer, MartaSolà-Morales Rubió, Joan deMultidisciplinary Mathematical Modelling: Applications of Mathematics to the Real World
http://hdl.handle.net/2117/384494
Multidisciplinary Mathematical Modelling: Applications of Mathematics to the Real World
Font Martínez, Francesc; Myers, Timothy G.; Hennessy, Matthew G.; Fanelli, Claudia; Sardanyes Cayuela, Josep; Alarcón, Tomás; Corral, Alvaro; Vives, Eduard; Serra, Isabel; Gonzalez, Alvaro; Navas-Portella, Victor; Penella, Celia
2023-03-02T13:43:33ZFont Martínez, FrancescMyers, Timothy G.Hennessy, Matthew G.Fanelli, ClaudiaSardanyes Cayuela, JosepAlarcón, TomásCorral, AlvaroVives, EduardSerra, IsabelGonzalez, AlvaroNavas-Portella, VictorPenella, CeliaFluid power, mathematical design of several components
http://hdl.handle.net/2117/133039
Fluid power, mathematical design of several components
Bergadà Granyó, Josep Maria; Kumar, Sushil
Fluid power scientists and engineers have produced a large amount of high quality books so far, which cover a vast amount of technologies involved in this field. Names like H. Merritt, D. McCloy, H.R. Martin, W. Backe, J Watton, K. Edge, M. Ivantysynova, N.D. Manring among many others must be considered as the milestones in this field; their scientific publications and books have inspired generations of engineers.
The first author of this book was lucky to be able to closely work for over 10 years with Professor John Watton, and in fact, most of the original research presented in this volume was undertaken at Cardiff University.
The present book focuses on several components of fluid mechanics. The first three chapters are designed to give a proper background to the reader regarding the main fluid characteristics, chapter 1, the main fluid mechanics equations, chapter 2, and a strategic background of the Computer Fluid Dynamics (CFD) techniques, chapter 3. It must be kept in mind that nowadays, conventional mechanics, as well as fluid mechanics, are fully immersed in the CFD era, therefore the components design desperately needs the use of this relatively new tool.
Chapter 4 introduces original research based on fluid mechanics understanding of relief valves and servovalves, dynamic and stability considerations are being given in both cases, and hints to solve stability problems are provided. Chapter 5 also provides original research on, very likely, the most complex machines in the fluid power field; piston pumps and motors. In fact, chapter 5 focuses on axial piston pumps, although the information gathered in this chapter can be directly extrapolated to other piston pumps and motor configurations. In Chapter 5 the reader will find a thorough mathematical description of how slippers with non vented grooves can be designed, the effect of grooves on pistons is also thoroughly analyzed. The barrel dynamic movements and piston pump pressure dynamics under different operating conditions are also introduced in this chapter. In all cases, the reader will be able to extract ideas of how a proper design shall be obtained. It is important o highlight that all experiments presented in chapter 5 were done by the book’s first author in the Professor John Watton Fluid Power laboratory at Cardiff University UK, this is why Professor John Watton has to be seen as a co-author of this particular chapter.
Chapters 6, 7 and 8 are designed to introduce some details which are often forgotten in many publications; these are the use of accumulators, the importance of proper filtration and the use of cartridge valves whenever fluid pressure and flow are overcoming a certain value. It is crucial to realize that accumulators can vastly improve a given circuit efficiency, often saving large amounts of energy. A proper filtration is crucial to increase the components life and prevent system failures.
According to the authors’ understanding, the present book may very well be used as a design tool for several Fluid Power components. Manufacturers, Engineers and fluid Power Researchers may get some helpful ideas to improve their products
2019-05-16T07:36:15ZBergadà Granyó, Josep MariaKumar, SushilFluid power scientists and engineers have produced a large amount of high quality books so far, which cover a vast amount of technologies involved in this field. Names like H. Merritt, D. McCloy, H.R. Martin, W. Backe, J Watton, K. Edge, M. Ivantysynova, N.D. Manring among many others must be considered as the milestones in this field; their scientific publications and books have inspired generations of engineers.
The first author of this book was lucky to be able to closely work for over 10 years with Professor John Watton, and in fact, most of the original research presented in this volume was undertaken at Cardiff University.
The present book focuses on several components of fluid mechanics. The first three chapters are designed to give a proper background to the reader regarding the main fluid characteristics, chapter 1, the main fluid mechanics equations, chapter 2, and a strategic background of the Computer Fluid Dynamics (CFD) techniques, chapter 3. It must be kept in mind that nowadays, conventional mechanics, as well as fluid mechanics, are fully immersed in the CFD era, therefore the components design desperately needs the use of this relatively new tool.
Chapter 4 introduces original research based on fluid mechanics understanding of relief valves and servovalves, dynamic and stability considerations are being given in both cases, and hints to solve stability problems are provided. Chapter 5 also provides original research on, very likely, the most complex machines in the fluid power field; piston pumps and motors. In fact, chapter 5 focuses on axial piston pumps, although the information gathered in this chapter can be directly extrapolated to other piston pumps and motor configurations. In Chapter 5 the reader will find a thorough mathematical description of how slippers with non vented grooves can be designed, the effect of grooves on pistons is also thoroughly analyzed. The barrel dynamic movements and piston pump pressure dynamics under different operating conditions are also introduced in this chapter. In all cases, the reader will be able to extract ideas of how a proper design shall be obtained. It is important o highlight that all experiments presented in chapter 5 were done by the book’s first author in the Professor John Watton Fluid Power laboratory at Cardiff University UK, this is why Professor John Watton has to be seen as a co-author of this particular chapter.
Chapters 6, 7 and 8 are designed to introduce some details which are often forgotten in many publications; these are the use of accumulators, the importance of proper filtration and the use of cartridge valves whenever fluid pressure and flow are overcoming a certain value. It is crucial to realize that accumulators can vastly improve a given circuit efficiency, often saving large amounts of energy. A proper filtration is crucial to increase the components life and prevent system failures.
According to the authors’ understanding, the present book may very well be used as a design tool for several Fluid Power components. Manufacturers, Engineers and fluid Power Researchers may get some helpful ideas to improve their productsHemodynamics in the thoracic aorta using OpenFOAM: 4D PCMRI versus CFD
http://hdl.handle.net/2117/103650
Hemodynamics in the thoracic aorta using OpenFOAM: 4D PCMRI versus CFD
Casacuberta Puig, Jordi; Soudah Prieto, Eduardo; Gámez Montero, Pedro Javier; Raush Alviach, Gustavo Adolfo; Castilla López, Roberto; Pérez Ronda, Jorge Suit
2017-04-24T08:49:28ZCasacuberta Puig, JordiSoudah Prieto, EduardoGámez Montero, Pedro JavierRaush Alviach, Gustavo AdolfoCastilla López, RobertoPérez Ronda, Jorge SuitLa crisi global, les Nacions Unides i la governança democràtica mundial
http://hdl.handle.net/2117/12652
La crisi global, les Nacions Unides i la governança democràtica mundial
Xercavins, Josep
La crisi financera i econòmica mundial que viu el món globalitzat des de l’estiu de 2007 planteja la qüestió de si estem davant de la fi d’un cicle o de la fi d’un model, i posa en evidència la necessitat d’un profund debat d’idees. A banda de les causes immediates de la crisi, s’observen causes
profundes que són, principalment, resultat d’un període de globalització econòmica neoliberal.
Si l’efecte de la crisi als països del Nord és evident i palpable, el seu impacte als països menys desenvolupats és devastador, la
revisió del Consens de Monterrey, encaminada a concretar el finançament per a l’assoliment dels Objectius de Desenvolupament del Mil·lenni, va quedar frustrada pel naixement del G20.
L’abordatge polític de la crisi posa en qüestió els lideratges mundials. Si bé el G20 va voler monopolitzar el debat, finalment
les Nacions Unides, de la mà del president de l’Assemblea General, el pare d’Escoto, va poder convocar la Conferència sobre la Crisi Financera i Econòmica i els seus Efectes
Sobre el Desenvolupament (juny de 2009). Malgrat que els seus resultats són molt menors, i no s’hi van acordar moltes de les
recomanacions del mateix president i de la Comissió Stiglitz, les conclusions de tot plegat apunten a una imprescindible reforma
del sistema i de la governança de l’economia financera mundial. El “G192”, es va posar, doncs, sobre la taula un model de governança democràtica mundial per abordar un crisi global d’impacte sobre la ciutadania mundial. The financial and economic crisis that has been rocking the globalised world since the summer of 2007 raises the question
of whether we are looking at the end of a cycle or the end of a model and highlights the need for a thorough debate of ideas. In addition to the immediate causes of the crisis (such as the bursting of the housing bubble and the toxicity of the financial markets), several deep-rooted causes can be found, most resulting from a period of neo-liberal economic globalisation.
Whilst the crisis has had a clear and tangible impact on the countries of the North, it has been calamitous for less developed countries. The damage is compounded by the fact that the review of the Monterrey Consensus, intended to find the
necessary financing to achieve the Millennium Development Goals, was thwarted by the emergence of the G20.
The political hijacking of the crisis casts doubt on global leadership. Although the G20 monopolised the debate, in the end, the United Nations (UN), under the leadership of the president of the General Assembly, Father Miguel d’Escoto, managed to convene the Conference on the World Financial
and Economic Crisis and Its Impact on Development (June 2009). Despite the conference’s modest results and the fact
that no agreement was reached on many of the recommendations made by the president or the ‘Stiglitz Commission’, the conclusions as a whole point towards a crucial need to
reform the system and governance bodies of the global financial economy. To this end, within the context of the UN, or ‘G192’, a model of global democratic governance was tabled to address a global crisis with an impact on global citizens
2011-05-25T16:10:28ZXercavins, JosepLa crisi financera i econòmica mundial que viu el món globalitzat des de l’estiu de 2007 planteja la qüestió de si estem davant de la fi d’un cicle o de la fi d’un model, i posa en evidència la necessitat d’un profund debat d’idees. A banda de les causes immediates de la crisi, s’observen causes
profundes que són, principalment, resultat d’un període de globalització econòmica neoliberal.
Si l’efecte de la crisi als països del Nord és evident i palpable, el seu impacte als països menys desenvolupats és devastador, la
revisió del Consens de Monterrey, encaminada a concretar el finançament per a l’assoliment dels Objectius de Desenvolupament del Mil·lenni, va quedar frustrada pel naixement del G20.
L’abordatge polític de la crisi posa en qüestió els lideratges mundials. Si bé el G20 va voler monopolitzar el debat, finalment
les Nacions Unides, de la mà del president de l’Assemblea General, el pare d’Escoto, va poder convocar la Conferència sobre la Crisi Financera i Econòmica i els seus Efectes
Sobre el Desenvolupament (juny de 2009). Malgrat que els seus resultats són molt menors, i no s’hi van acordar moltes de les
recomanacions del mateix president i de la Comissió Stiglitz, les conclusions de tot plegat apunten a una imprescindible reforma
del sistema i de la governança de l’economia financera mundial. El “G192”, es va posar, doncs, sobre la taula un model de governança democràtica mundial per abordar un crisi global d’impacte sobre la ciutadania mundial. The financial and economic crisis that has been rocking the globalised world since the summer of 2007 raises the question
of whether we are looking at the end of a cycle or the end of a model and highlights the need for a thorough debate of ideas. In addition to the immediate causes of the crisis (such as the bursting of the housing bubble and the toxicity of the financial markets), several deep-rooted causes can be found, most resulting from a period of neo-liberal economic globalisation.
Whilst the crisis has had a clear and tangible impact on the countries of the North, it has been calamitous for less developed countries. The damage is compounded by the fact that the review of the Monterrey Consensus, intended to find the
necessary financing to achieve the Millennium Development Goals, was thwarted by the emergence of the G20.
The political hijacking of the crisis casts doubt on global leadership. Although the G20 monopolised the debate, in the end, the United Nations (UN), under the leadership of the president of the General Assembly, Father Miguel d’Escoto, managed to convene the Conference on the World Financial
and Economic Crisis and Its Impact on Development (June 2009). Despite the conference’s modest results and the fact
that no agreement was reached on many of the recommendations made by the president or the ‘Stiglitz Commission’, the conclusions as a whole point towards a crucial need to
reform the system and governance bodies of the global financial economy. To this end, within the context of the UN, or ‘G192’, a model of global democratic governance was tabled to address a global crisis with an impact on global citizens