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Search Results: 1 - 10 of 154647 matches for " Roy H. Nyberg "
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Localized Bosonic Modes in Superconductors
Dirk K. Morr,Roy H. Nyberg
Physics , 2003, DOI: 10.1103/PhysRevB.68.060505
Abstract: We show that a localized bosonic mode acts as a new type of "defect" in s- and d_{x^2-y^2}-wave superconductors. The mode induces bound or resonance states, whose spectral signature are peaks in the superconductor's density of states (DOS). We study the peaks' shape and energy as a function of temperature and the mode's frequency and lifetime. We identify several characteristic signatures of the localized mode that qualitatively distinguishes its effects from those of magnetic or non-magnetic impurities.
Molecular Nanostructures on the Surface of a d_(x2-y2)-Superconductor
Roy H. Nyberg,Dirk K. Morr
Physics , 2004,
Abstract: We study molecular nanostructures on the surface of a d_(x2-y2)-wave superconductor. We show that the interplay between the molecular nanostructure's internal excitation spectrum and quantum interference of the scattered host electrons leads to a series of novel effects in the local density of states. We demonstrate that these effects give insight into both the nature of the superconducting pairing correlations and of the intermolecular interactions.
Identifying Collective Modes via Impurities in the Cuprate Superconductors
Roy H. Nyberg,Enrico Rossi,Dirk K. Morr
Physics , 2007, DOI: 10.1103/PhysRevB.78.054504
Abstract: We show that the pinning of collective charge and spin modes by impurities in the cuprate superconductors leads to qualitatively different fingerprints in the local density of states (LDOS). In particular, in a pinned (static) spin droplet, the creation of a resonant impurity state is suppressed, the spin-resolved LDOS exhibits a characteristic spatial pattern, and the LDOS undergoes significant changes with increasing magnetic field. Since all of these fingerprints are absent in a charge droplet, impurities are a new probe for identifying the nature and relative strength of collective modes.
ADVICE FROM A PROFESSIONAL: The DNA of a Technical Communicator
Mette Nyberg
Communication & Language at Work , 2013,
Abstract: Unlike our peers in the US or UK, the technical communicators in the Danish/Scandinavian region have not had the luck of easy access to formal education within the field of technical communication. I claim that most of us technical communicators in the Danish/Scandinavian region do not have a formal technical communication degree. We have learned on the job – spiced with relevant courses (such as Information Mapping), and we have kept ourselves up to date by attending conferences, reading books and articles. For the past 10 years or so we have been blessed with the growing wealth of information on the Internet to keep us in the loop and the social media to exchange views and experiences. This article discusses the evolution of a technical communicator profile as known in the Danish/Scandinavian region and what it takes to become a good technical communicator. What is indeed the skill set of a good technical communicator? Is there at all a future for technical communicators - and is it a promising career path?
Scalar Curvature and Stability of Toric Fibrations
Thomas Nyberg
Mathematics , 2012,
Abstract: We study fibrations $\cV$ of toric varieties over the flag variety $G/T$, where $G$ is a compact semisimple Lie group and $T$ is a maximal torus. From symplectic data, we construct test configurations of $\cV$ and compute their Futaki invariants by employing a generalization of Pick's Theorem. We also give a simple form of the Mabuchi Functional.
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.
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