2,742 research outputs found
Victor Yuan (袁岳) interview for the China Boom Project
No full textVictor Yuan, Chairman of Horizon Research Consultancy Group, was interviewed by the Asia Society staff in New York, USA on March 2, 2010.Transcript and interviewee's bio are available.Original video interviews are available at the Asia Society.The China Boom Project classified this interviewee’s field as Academics
A sensitive area: Victor Krylov looks at ground vibration boom - the phenomenon to be reckoned with when developing HS2 high-speed lines
No full textA sensitive area: Victor Krylov looks at ground vibration boom - the phenomenon to be reckoned with when developing HS2 high-speed line
A sensitive area: Victor Krylov looks at ground vibration boom - the phenomenon to be reckoned with when developing HS2 high-speed lines
No full textA sensitive area: Victor Krylov looks at ground vibration boom - the phenomenon to be reckoned with when developing HS2 high-speed line
China and the Latin America Commodities Boom: A Critical Assessment
No full textThis Working Paper analyzes the extent to which Chinese demand enhanced the performance of Latin American economies in economic boom that took place from the turn of the century until the run up to the financial and economic crisis of 2008-2009. It has been argued that China’s rise was been a blessing for the region, because Chinese demand boosted exports and in part caused a hike in commodities prices worldwide. The author finds that the direct impact on the Latin American exports was much smaller than what was touted. He goes on to address concerns over a Chinese-demand-led 'resource curse' and deindustrialization in Latin America.
The Baby Boom and Baby Bust
No full textWhat caused the baby boom? And, can it be explained within the context of the secular decline in fertility that has occurred over the last 200 years? The hypothesis is that: 1. The secular decline in fertility is due to the relentless rise in real wages that increased the opportunity cost of having children. 2. The baby boom is explained by an atypical burst of technological progress in the household sector that occurred in the middle of the last century. This lowered the cost of having children. A model is developed in an attempt to account, quantitatively, for both the baby boom and bust.Baby boom, fertility, technological progress
Numerical modeling of oil spill containment by boom using SPH
No full textThe ocean environment is protected from oil pollution usually by using floating booms, which involves water-oil two-phase flow and strong fluid-structure interaction. In this paper, a modified multi-phase smoothed particle hydrodynamics (SPH) method is proposed to model oil spill containment by using a moving boom. Four major influencing factors including oil type, moving velocity and skirt angle of the boom, and water wave are investigated. The SPH simulation results demonstrate different typical boom failure modes found in laboratory experiments. It is shown that the ability of a boom in containing oil is not only affected by its own characteristics, but also closely related to external environmental factors. It is found that boom failure is more likely to happen for heavy oil, high boom velocity, negative skirt angle, and/or in the presence of water waves.The ocean environment is protected from oil pollution usually by using floating booms, which involves water-oil two-phase flow and strong fluid-structure interaction. In this paper, a modified multi-phase smoothed particle hydrodynamics (SPH) method is proposed to model oil spill containment by using a moving boom. Four major influencing factors including oil type, moving velocity and skirt angle of the boom, and water wave are investigated. The SPH simulation results demonstrate different typical boom failure modes found in laboratory experiments. It is shown that the ability of a boom in containing oil is not only affected by its own characteristics, but also closely related to external environmental factors. It is found that boom failure is more likely to happen for heavy oil, high boom velocity, negative skirt angle, and/or in the presence of water waves
Adaptive sonic boom sensitivity analysis
No full textThis paper presents an accurate approach to simulate the sonic boom of a supersonic aircraft. The near field flow is modeled by the conservative Euler equations and is solved using a finite volume approach on adapted unstructured tetrahedral meshes. Then, from the CFD solution, the pressure distribution under the aircraft is extracted and used to set up the initial conditions of the propagation algorithm in the far field. The pressure distribution is propagated down to the ground in order to obtain the sonic boom signature using a ray tracing algorithm based upon the Thomas waveform parameter method. In this study, a sonic boom sensitivity analysis on the SSBJ geometry provided by Dassault Aviation is carried out
Implications for high speed research: The relationship between sonic boom signature distortion and atmospheric turbulence
No full textIn this study there were two primary tasks. The first was to develop an algorithm for quantifying the distortion in a sonic boom. Such an algorithm should be somewhat automatic, with minimal human intervention. Once the algorithm was developed, it was used to test the hypothesis that the cause of a sonic boom distortion was due to atmospheric turbulence. This hypothesis testing was the second task. Using readily available sonic boom data, we statistically tested whether there was a correlation between the sonic boom distortion and the distance a boom traveled through atmospheric turbulence
Geomechanical unloading behaviour of Boom clay for excavations
No full textThis thesis describes the geomechanical unloading behaviour of Boom clay for excavations. The Boom clay is of specific interest for the completion of the motorway ring around Antwerp. Many deep excavations in the Boom clay have to be performed, but the clay’s behaviour when unloaded is not fully understood to date. To gain better understanding of this behaviour a full scale trial excavation in Oosterweel, the west district of Antwerp, was performed. This resulted in unique field measurements on the Boom clay’s unloading behaviour. For the numerical modelling of the trial excavation two numerical models have been used: the Hardening Soil model with small strain stiffness (HSs) and the Generalised Hardening Soil (GHS) model. The numerical calculations have been performed with an axisymmetric approach, which was acceptable due to the octagonal shape of the trial excavation. It was found that the influence of small strain stiffness is important to model the displacements correctly. The long-term behaviour of the Boom clay remains a challenging point. It is recommended that laboratory oedometer tests are performed, lasting several months after the unloading steps. Additionally it is highly recommended to monitor the trial excavation in its current state for at least a year. This could provide crucial information on the long-term behaviour of the Boom clay.Civil Engineering and GeosciencesGeotechnical Engineerin
Optimization of a 2D Forebody for Sonic Boom Minimization
No full textWhen an object moves near sonic speed a shock wave will be formed and all disturbances and discontinuities remain localized in an area downstream of the shock wave. The impact of sonic boom is both of psychosomatic and structural damage. The sonic boom is unacceptable to the human ears due to the fact that it appears without warning and it produces structural damage. The sonic boom is unavoidable for an airplane which has lift, so the effort should be made to minimize the unacceptability degree on the part of the people.Aerospace Engineerin
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