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Search Results: 1 - 10 of 87948 matches for " I. Bentley "
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Microscopic Calculation of IBM Parameters by Potential Energy Surface Mapping
I. Bentley,S. Frauendorf
Physics , 2011, DOI: 10.1103/PhysRevC.83.064322
Abstract: A coherent state technique is used to generate an Interacting Boson Model (IBM) Hamiltonian energy surface that simulates a mean field energy surface. The method presented here has some significant advantages over previous work. Specifically, that this can be a completely predictive requiring no a priori knowledge of the IBM parameters. The technique allows for the prediction of the low lying energy spectra and electromagnetic transition rates which are of astrophysical interest. Results and comparison with experiment are included for krypton, molybdenum, palladium, cadmium, gadolinium, dysprosium and erbium nuclei.
Relation between Wigner energy and proton-neutron pairing
I. Bentley,S. Frauendorf
Physics , 2012, DOI: 10.1103/PhysRevC.88.014322
Abstract: The linear term proportional to $|N-Z|$ in the nuclear symmetry energy (Wigner energy)is obtained in a model that uses isovector pairing on single particle levels from a deformed potential combined with a $\vec T^2$ interaction. The pairing correlations are calculated by numerical diagonalization of the pairing Hamiltonian acting on the six or seven levels nearest the $N=Z$ Fermi surface. The experimental binding energies of nuclei with $N\approx Z$ are well reproduced. The Wigner energy emerges as a consequence of restoring isospin symmetry. We have found the Wigner energy to be insensitive to the presence of moderate isoscalar pair correlations.
Nuclear masses near N = Z from Nilsson-Strutinsky calculations with pairing corrections beyond BCS from an isospin-conserving pairing force
I. Bentley,K. Neerg?rd,S. Frauendorf
Physics , 2013, DOI: 10.1103/PhysRevC.89.034302
Abstract: A model with nucleons in a charge-independent potential well interacting by an isovector pairing force is considered. For a 24-dimensional valence space, the Hartree-Bogolyubov (HB) plus random phase approximation (RPA) to the lowest eigenvalue of the Hamiltonian is shown to be accurate except near values of the pairing force coupling constant G where the HB solution shifts from a zero to a non-zero pair gap. In the limit G -> infinity the HB + RPA is asymptotically exact. The inaccuracy of the HB + RPA in the critical regions of G can be remedied by interpolation. The resulting algoritm is used to calculate pairing corrections in the framework of a Nilsson-Strutinsky calculation of nuclear masses near N = Z for A = 24-100, where N and Z are the numbers of neutrons and protons, and A = N + Z. The dimension of the valence space is 2A in these calculations. Adjusting five liquid drop parameters and a power law expression for the constant G as a function of A allows us to reproduce the measured binding energies of 112 doubly even nuclei in this range with a root mean square deviation of 0.95 MeV. Several combinations of the masses for different N, Z, and isospin T are considered and the calculations found to be in good agreement with the data. It is demonstrated by examples how fluctuations as a function of A of the constant X in an expansion of the symmetry energy of the form T(T+X)/(2 theta) can be understood from the shell structure.
The effects of three days of sub-maximal-intensity mountain biking on sleep
SP Murphy, A Fuller, AJ Bentley, I Avidon
South African Journal of Sports Medicine , 2011,
Abstract: Objectives. We determined the effect of three consecutive days of sub-maximal-intensity mountain biking (4.5 hours per day, ~64 km per day), on the sleep of ten healthy, trained male and female mountain bikers. Methods. The sleep of the mountain bikers was assessed both subjectively (visual analogue scales and sleep questionnaires) and objectively (activity data logger) on each night of mountain biking and for seven nights when they were not cycling (pre-exercise, mean of seven nights). The cyclists’ mood and muscular pain were assessed each night using visual analogue scales. The cyclists slept at home in their normal environment. Results. There was no significant difference between the mountain bikers’ muscular pain and mood (calm/anxious visual analogue scale) measured during the pre-exercise stage and their pain and mood measured on each of the mountain biking nights (p>0.05). However, compared with the pre-exercise stage, the mountain bikers reported that they were significantly more tired (tired/energetic visual analogue scale) on each night of cycling (p<0.01). The sleep of the mountain bikers was disrupted on the night of the third day of mountain biking only. On this night, compared with the pre-exercise stage, the mountain bikers reported that they woke up more during the night (double the number of times) (p<0.001), and an activity data logger recorded that they were awake for about half an hour longer during the night (p<0.05). Conclusion. We have shown that three days of repeated, endurance sub-maximal mountain biking disrupted the sleep of the mountain bikers on the third night of cycling.
Sensitivity of the r-process to nuclear masses
S. Brett,I. Bentley,N. Paul,R. Surman,A. Aprahamian
Physics , 2012, DOI: 10.1140/epja/i2012-12184-4
Abstract: The rapid neutron capture process (r-process) is thought to be responsible for the creation of more than half of all elements beyond iron. The scientific challenges to understanding the origin of the heavy elements beyond iron lie in both the uncertainties associated with astrophysical conditions that are needed to allow an r-process to occur and a vast lack of knowledge about the properties of nuclei far from stability. There is great global competition to access and measure the most exotic nuclei that existing facilities can reach, while simultaneously building new, more powerful accelerators to make even more exotic nuclei. This work is an attempt to determine the most crucial nuclear masses to measure using an r-process simulation code and several mass models (FRDM, Duflo-Zuker, and HFB-21). The most important nuclear masses to measure are determined by the changes in the resulting r-process abundances. Nuclei around the closed shells near N=50, 82, and 126 have the largest impact on r-process abundances irrespective of the mass models used.
When Utility Jumps: The Value of Having Cash in the Hand  [PDF]
Kurt W. Rotthoff, Bentley Coffey
Theoretical Economics Letters (TEL) , 2018, DOI: 10.4236/tel.2018.81004
Abstract: Different theoretical explanations have been developed for seemingly inconsistent actions that deal with varying levels of risk and time. We propose a simple model of utility that unifies these seemingly separate phenomena, while not departing too far from the standard models of utility maximization already in use. Our driving assumption is that preferences over riskier outcomes discontinuously depart from preferences under certainty; a jump from no risk to some risk is fundamentally different from a movement of some risk to more risk.
Europeanization of the World or Globalization of Europe?
Jerry Bentley
Religions , 2012, DOI: 10.3390/rel3020441
Abstract: Building on his long career as a distinguished historian of early modern Europe, John Miles Headley has recently turned his gaze to the influence of Europe in the larger world. In The Europeanization of the World, Headley makes an insistent case for the uniqueness of European values—particularly human rights and democracy—and argues that these values are Europe’s most precious gifts to the larger world. Without seeking to diminish the remarkable intellectual and cultural achievements of European peoples, this presentation will suggest a more nuanced view of relations between Europe and the larger world. Human rights and democracy mean different things to different peoples in different contexts at different times, and there have in fact been numerous expressions of both in societies beyond Europe. Furthermore, European theorists of human rights and democracy drew influence from societies beyond Europe. To the extent that the Europeanization of the world is a persuasive idea, it is possible only because of a prior globalization of Europe.
Karl Barth's definition of church in politics and culture: Growth points for the church in South Africa
W Bentley
HTS Theological Studies/Teologiese Studies , 2007,
Abstract: The article describes briefly Karl Barth's views on church, its role in politics and how it relates to culture. This is done by identifying the way in which the church participates in the social realm through its relationship with the State. The historic religious question asks whether there is a natural mutual-determining relationship between church and State. The church may ask whether faith and politics should mix, while a secular state may question the authority which the church claims to speak from. To a large extent culture determines the bias in this relationship. History has shown that church- State dynamics is not an either/or relationship, whereby either the authority of the church or the authority of the State should function as the ruling norm. Karl Barth describes the dynamics of this relationship very well, within the context of culture, in the way his faith engages with the political status quo. Once the relationship is better understood, Barth's definition of the church will prove to be more effective in its evangelical voice, speaking to those who guide its citizens through political power. HTS Theological Studies Vol. 63 (4) 2007: pp. 1643-1661
The formation of Christian leaders: a Wesleyan approach
W. Bentley
Koers : Bulletin for Christian Scholarship , 2010, DOI: 10.4102/koers.v75i3.96
Abstract: The problem of leadership is that it is defined according to a very narrow understanding. It postulates that all people can be divided into two categories. People are either leaders or followers. This article explores the formation of Christian leaders using the model offered by the Wesleyan revival of eigteenthcentury England. It asks what leaders would look like when we use the Wesleyan definition instead of the leader-follower understanding to which we have grown accustomed.
Karl Barth’s definition of church in politics and culture: Growth points for the church in South Africa
Wessel Bentley
HTS Theological Studies/Teologiese Studies , 2009, DOI: 10.4102/hts.v63i4.263
Abstract: The article describes briefly Karl Barth’s views on church, its role in politics and how it relates to culture. This is done by identifying the way in which the church participates in the social realm through its relationship with the State. The historic religious question asks whether there is a natural mutual-determining relationship between church and State. The church may ask whether faith and politics should mix, while a secular state may question the authority which the church claims to speak from. To a large extent culture determ-ines the bias in this relationship. History has shown that church-State dynamics is not an either/or relationship, whereby either the authority of the church or the authority of the State should function as the ruling norm. Karl Barth describes the dynamics of this relationship very well, within the context of culture, in the way his faith engages with the political status quo. Once the relationship is better understood, Barth’s definition of the church will prove to be more effective in its evangelical voice, speaking to those who guide its citizens through political power. “Fürchtet Gott, ehret den K nig!” (1 Pt 2:17)
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