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Author: Masahiro Furuya Publisher: IOS Press ISBN: 9781586036058 Category : Technology & Engineering Languages : en Pages : 148
Book Description
20% of the Nuclear Power Plants are known as Boiling Water Reactors (BWRs). These BWRs have pumps that cool their reactor. In the design of new BWRs, ways to cool the core by a natural circulation flow, without pumps, also called natural circulation BWRs, are being considered. In these new systems, a chimney is installed on top of the core to increase natural circulation flow. A possible disadvantage of natural circulation BWRs might be their susceptibility to instabilities, which could then lead to both flow and power oscillations. The stability features of both natural circulation and forced circulation BWRs have been investigated thoroughly, using dedicated experimental setups, analytical models and numerical codes. We distinguish between pure thermal-hydraulic stability - where the fission power is assumed to be constant - and coupled thermalhydraulic-neutronic stability - where the two-phase mixture in the core influences the fission chain reaction...
Author: Masahiro Furuya Publisher: IOS Press ISBN: 9781586036058 Category : Technology & Engineering Languages : en Pages : 148
Book Description
20% of the Nuclear Power Plants are known as Boiling Water Reactors (BWRs). These BWRs have pumps that cool their reactor. In the design of new BWRs, ways to cool the core by a natural circulation flow, without pumps, also called natural circulation BWRs, are being considered. In these new systems, a chimney is installed on top of the core to increase natural circulation flow. A possible disadvantage of natural circulation BWRs might be their susceptibility to instabilities, which could then lead to both flow and power oscillations. The stability features of both natural circulation and forced circulation BWRs have been investigated thoroughly, using dedicated experimental setups, analytical models and numerical codes. We distinguish between pure thermal-hydraulic stability - where the fission power is assumed to be constant - and coupled thermalhydraulic-neutronic stability - where the two-phase mixture in the core influences the fission chain reaction...
Author: R. I. Sujith Publisher: Springer Nature ISBN: 3030811352 Category : Science Languages : en Pages : 484
Book Description
This book systematically presents the consolidated findings of the phenomenon of self-organization observed during the onset of thermoacoustic instability using approaches from dynamical systems and complex systems theory. Over the last decade, several complex dynamical states beyond limit cycle oscillations such as quasiperiodicity, frequency-locking, period-n, chaos, strange non-chaos, and intermittency have been discovered in thermoacoustic systems operated in laminar and turbulent flow regimes. During the onset of thermoacoustic instability in turbulent systems, an ordered acoustic field and large coherent vortices emerge from the background of turbulent combustion. This emergence of order from disorder in both temporal and spatiotemporal dynamics is explored in the contexts of synchronization, pattern formation, collective interaction, multifractality, and complex networks. For the past six decades, the spontaneous emergence of large amplitude, self-sustained, tonal oscillations in confined combustion systems, characterized as thermoacoustic instability, has remained one of the most challenging areas of research. The presence of such instabilities continues to hinder the development and deployment of high-performance combustion systems used in power generation and propulsion applications. Even with the advent of sophisticated measurement techniques to aid experimental investigations and vast improvements in computational power necessary to capture flow physics in high fidelity simulations, conventional reductionist approaches have not succeeded in explaining the plethora of dynamical behaviors and the associated complexities that arise in practical combustion systems. As a result, models and theories based on such approaches are limited in their application to mitigate or evade thermoacoustic instabilities, which continue to be among the biggest concerns for engine manufacturers today. This book helps to overcome these limitations by providing appropriate methodologies to deal with nonlinear thermoacoustic oscillations, and by developing control strategies that can mitigate and forewarn thermoacoustic instabilities. The book is also beneficial to scientists and engineers studying the occurrence of several other instabilities, such as flow-induced vibrations, compressor surge, aeroacoustics and aeroelastic instabilities in diverse fluid-mechanical environments, to graduate students who intend to apply dynamical systems and complex systems approach to their areas of research, and to physicists who look for experimental applications of their theoretical findings on nonlinear and complex systems.
Author: European Environment Agency Publisher: Luxembourg : Office for Official Publications of the European Communities ISBN: Category : Antibiotics in animal nutrition Languages : en Pages : 220
Book Description
The precautionary principle is widely seen as fundamental to successful policies for sustainability. This title looks back over the last century to examine the role the principle played in a range of major and avoidable public disasters.
Author: Paul Harremoes Publisher: Routledge ISBN: 1134207786 Category : Business & Economics Languages : en Pages : 289
Book Description
The precautionary principle is widely seen as fundamental to successful policies for sustainability. It has been cited in international courts and trade disputes between the USA and the EU, and invoked in a growing range of political debates. Understanding what it can and cannot achieve is therefore crucial. This volume looks back over the last century to examine the role the principle played or could have played, in a range of major and avoidable public disasters. From detailed investigation of how each disaster unfolded, what the impacts were and what measures were adopted, the authors draw lessons and establish criteria that could help to minimise the health and environmental risks of future technological, economic and policy innovations. This is an informative resource for all those from lawyers and policy-makers, to researchers and students needing to understand or apply the principle.
Author: Yong Bai Publisher: Gulf Professional Publishing ISBN: 0123978041 Category : Science Languages : en Pages : 957
Book Description
Subsea production systems, overview of subsea engineering, subsea field development, subsea distribution system. Flow assurance and system engineering. Susea structure and equiment. Subsea umbilical, risers and flowlines.
Author: Francesca Ottolenghi Publisher: Fao ISBN: Category : Business & Economics Languages : en Pages : 344
Book Description
"The aim of this report is to define and review this "semi-aquaculture practice", which has been more accurately named "capture-based aquaculture." -- Preface.
Author: Executive Enterprises, Inc. Publisher: Wiley ISBN: 9780471112501 Category : Technology & Engineering Languages : en Pages : 191
Book Description
This useful guide contains more than 3,000 environmental acronyms and abbreviations. It also includes a glossary of more than 1,000 environmental terms for those frequently used but difficult to find expressions, written in non-technical, easy-to-understand language.
Author: K Srilata Publisher: Penguin UK ISBN: 8184758561 Category : Family & Relationships Languages : en Pages : 155
Book Description
It is their last evening together. Maya, Sandra and Derek, graduate students at UC Santa Cruz and house-mates for three years, are preparing for dinner with Uncle Prithvi, the house-owner. It’s a cheerful and quirky household: Sandra is prone to ‘Orkut attacks’; Derek silently pines for the wistful-looking Afghan boy in the photo on his wall; Maya, who has the hots for Derek, is inexplicably terrified of the ocean; and the elusive Uncle Prithvi communicates through notes he leaves all over the place. Sad at parting, perhaps forever, and half tipsy, Maya, Sandra and Uncle Prithvi play a game of wapping stories as they wait for Derek to arrive. As the evening progresses, we learn their deep, dark secrets and hidden fears. Sandra, abandoned at birth, talks about growing up in an orphanage with her precious twin, disabled Solana, only to be separated by circumstances; Uncle Prithvi rues the loss of his beloved daughter, whom he betrayed when he sought a new life with Karen in the US. Maya, the narrator, can’t bring herself to open up—except when alone. And Derek avoids revealing himself altogether as he doesn’t turn up at all. Finely crafted and deeply felt, Table for Four is a rumination on the burden of secrets, of learning to let go and accepting the betrayals and losses in our lives.
Author: Masahiro Furuya
Author: Masahiro Furuya
Author: R. I. Sujith
Author: India. Ministry of External Affairs
Author: Institution of Engineers (India)
Author: European Environment Agency
Author: Paul Harremoes
Author: Yong Bai
Author: Francesca Ottolenghi
Author: Executive Enterprises, Inc.
Author: K Srilata