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匹配条件: “H. Roy” ,找到相关结果约153874条。
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Fe cristiana y fecundación In Vitro
May,Roy H.;
Medicina Legal de Costa Rica , 2002,
Abstract: the techniques of assisted human reproduction, among them in vitro fertilization (ivf), raise ethical questions. their use promises benefits for humanity and, specifically for infertile couples, the satisfaction of being parents. this article proposes that christian faith affirms the ethical legitimacy of ivf based on the founding values of mercy, justice, well-being, love, and commitment to the needy as practiced by jesus christ. lt is argued that ivf promotes human life and dignity. in addition, it is proposed that ethics is best understood not in deontological terms, but rather in terms of contexts that respond to real life situations, specifically an ethics of responsibility.
THERMODYNAMICS OF BINARY ALLOYS OF PHARMACEUTICAL ACTIVE IMIDAZOLE WITH O- PHENYLENEDIAMINE
Shekhar H.,Roy Y.
International Research Journal of Pharmacy , 2012,
Abstract: The present study describes the investigation of eutectic and non-eutectic alloys of imidazole (IM) with o - Phenylenediamine (OPD). the solid-liquid equilibrium (SLE) data determined by thaw melt method in the form of melting temperature with their corresponding composition construct the solid-liquid equilibrium phase diagram which suggests simple eutectic behaviour is followed by the binary system. The activity co-efficient model based on enthalpy of fusion was employed to calculate the excess partial and integral thermodynamic functions such as gE, hE and sE. These values help to predict the nature of molecular interaction, ordering and stability between the components. The spontaneity of mixing of eutectic and non eutectic alloys was discussed by the partial and integral mixing quantities GM, HM and SM. Using Gibbs-Duhem equation the solution of partial molar heat of mixing, activity and activity coefficient of the component in the binary mix have been resolved.
Fe cristiana y fecundación In Vitro
Roy H. May
Medicina Legal de Costa Rica , 2002,
Abstract: Las técnicas de reproducción humana asistida, y entre ellas la fecundación in vitro (FIV), suscitan interrogantes éticas. Su empleo promete beneficios para la humanidad y, específicamente para parejas infértiles la satisfacción de ser madres y padres. En este artículo se propone que la fe cristiana ha de afirmar la legitimidad ética de la FIV, ésta con base en los valores fundantes de la fe como la misericordia, la justicia, el bienestar, el amor y el compromiso con los necesitados que practicó Jesucristo. Se argumenta que la FIV es una técnica que promueve la vida y la dignidad humanas. Además se propone que la ética se entiende mejor no en términos deontológicos, sino contextuales que responden a situaciones reales de la vida, específicamente una ética de la responsabilidad. The techniques of assisted human reproduction, among them in vitro fertilization (IVF), raise ethical questions. Their use promises benefits for humanity and, specifically for infertile couples, the satisfaction of being parents. This article proposes that Christian faith affirms the ethical legitimacy of IVF based on the founding values of mercy, justice, well-being, love, and commitment to the needy as practiced by Jesus Christ. lt is argued that IVF promotes human life and dignity. In addition, it is proposed that ethics is best understood not in deontological terms, but rather in terms of contexts that respond to real life situations, specifically an ethics of responsibility.
Chaotic scattering in solitary wave interactions: A singular iterated-map description
Roy H. Goodman
Physics , 2007, DOI: 10.1063/1.2904823
Abstract: We derive a family of singular iterated maps--closely related to Poincare maps--that describe chaotic interactions between colliding solitary waves. The chaotic behavior of such solitary wave collisions depends on the transfer of energy to a secondary mode of oscillation, often an internal mode of the pulse. Unlike previous analyses, this map allows one to understand the interactions in the case when this mode is excited prior to the first collision. The map is derived using Melnikov integrals and matched asymptotic expansions and generalizes a ``multi-pulse'' Melnikov integral and allows one to find not only multipulse heteroclinic orbits, but exotic periodic orbits. The family of maps derived exhibits singular behavior, including regions of infinite winding. This problem is shown to be a singular version of the conservative Ikeda map from laser physics and connections are made with problems from celestial mechanics and fluid mechanics.
A He-rich g-mode pulsator on the BHB
Roy H. ?stensen
Physics , 2013,
Abstract: We introduce the first g-mode pulsator found to reside on the classical blue horizontal branch. We extend the original discovery dataset to include more than 3 years of continuous photometry of KIC 1718290, which reveals a rich spectrum of low-amplitude modes with periods between one and twelve hours, most of which follow a regular spacing of 276.3 s. This mode structure strongly resembles that of the V1093 Her pulsators, with only a slight shift towards longer periods. Our spectroscopy, however, reveals KIC 1718290 to be quite distinct from the sdB stars that show V1093Her pulsations, which all have surface gravities higher than log g = 5.1 and helium abundances depleted by at least an order of magnitude relative to the solar composition. We find that KIC 1718290 has T_eff = 22 100 K, log g = 4.72, and a supersolar helium abundance (log He/H = -0.45). This places it well above the extreme horizontal branch, and rather on the very blue end of the classical horizontal branch. We conclude that KIC 1718290 must have suffered extreme mass loss during its first giant stage, but not sufficient to reach the extreme horizontal branch.
Asteroseismology and evolution of EHB stars
Roy H. ?stensen
Physics , 2009, DOI: 10.1553/cia159s75
Abstract: The properties of the Extreme Horizontal Branch stars are quite well understood, but much uncertainty surrounds the many paths that bring a star to this peculiar configuration. Asteroseismology of pulsating EHB stars has been performed on a number of objects, bringing us to the stage where comparisons of the inferred properties with evolutionary models becomes feasible. In this review I outline our current understanding of the formation and evolution of these stars, with emphasis on recent progress. The aim is to show how the physical parameters derived by asteroseismology can enable the discrimination between different evolutionary models.
Observational asteroseismology of hot subdwarf stars
Roy H. ?stensen
Physics , 2010, DOI: 10.1003/asna.201011450
Abstract: Hot subdwarf stars are particularly challenging for asteroseismology due to their rapid pulsation periods, intrinsic faintness and relative rarity both in the field and in clusters. These features have ensured that the preferred method of observation up to now has been white-light photometry, and all asteroseismological solutions to date have been made by model fitting of the frequency spectrum. Several attempts have been made to perform asteroseismology using time-resolved spectroscopy on the brightest of these stars, but with modest results. A few attempts at simultaneous multi-color photometry have also been made to identify modes with the amplitude ratio method. We will review the most recent observational results and progress in improving the observational methods for ground-based asteroseismology of these compact pulsators.
Nine months of monitoring of a V777-Her pulsator with the Kepler spacecraft
Roy H. ?stensen
Physics , 2013,
Abstract: The V777 Her pulsator KIC 8626021 has been observed continuously by the Kepler space telescope for nine months. Two new independent pulsation modes are detected in the extended dataset, which both match the predicted sequence of \ell = 2 modes. We demonstrate the photometric stability of the main pulsation modes and discuss the prospect of measuring period changes within the context of the extended Kepler mission.
Hamiltonian Hopf bifurcations and chaos of NLS/GP standing-wave modes
Roy H. Goodman
Physics , 2011, DOI: 10.1088/1751-8113/44/42/425101
Abstract: We examine the dynamics of solutions to nonlinear Schrodinger/Gross-Pitaevskii equations that arise due to Hamiltonian Hopf (HH) bifurcations--the collision of pairs of eigenvalues on the imaginary axis. To this end, we use inverse scattering to construct localized potentials for this model which lead to HH bifurcations in a predictable manner. We perform a formal reduction from the partial differential equations (PDE) to a small system of ordinary differential equations (ODE). We show numerically that the behavior of the PDE is well-approximated by that of the ODE and that both display Hamiltonian chaos. We analyze the ODE to derive conditions for the HH bifurcation and use averaging to explain certain features of the dynamics that we observe numerically.
Pulsating hot subdwarfs with MS companions or: EO Ceti is an sdO pulsator!
Roy H. ?stensen
Physics , 2011,
Abstract: About half of the hot subdwarfs are found to have spectra of composite types, indicating a main sequence companion of spectral type F-K, and the pulsators are no exception to this rule. The spectroscopic contamination from the main sequence stars makes it hard to reliably establish physical parameters for the hot component, and also makes pulsations harder to detect as the amplitudes are depressed. The binary fraction of the observed sample of hot subdwarf pulsators is discussed, as are the biases that are affecting it. Spectroscopic evidence is presented that clearly demonstrates that the well known sdB pulsator, EOCeti, is misclassified, and is actually an sdOV star.
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