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Search Results: 1 - 10 of 4146 matches for " Albert Migliori "
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Many-body instabilities and mass generation in slow Dirac materials
Christopher Triola,Jian-Xin Zhu,Albert Migliori,Alexander V. Balatsky
Physics , 2015, DOI: 10.1103/PhysRevB.92.045401
Abstract: Some Kondo insulators are expected to possess topologically protected surface states with linear Dirac spectrum, the topological Kondo insulators. Because the bulk states of these systems typically have heavy effective electron masses, the surface states may exhibit extraordinarily small Fermi velocities that could force the effective fine structure constant of the surface states into the strong coupling regime. Using a tight-binding model we study the many-body instabilities of these systems and identify regions of parameter space in which the system exhibits spin density wave, and charge density wave order.
New Aspects of the Temperature-Magnetic Field Phase Diagram of CeB6
R. G. Goodrich,David P. Young,Donavan Hall,Z. Fisk,N. Harrison,J. Betts,Albert Migliori,F. M. Woodward,J. W. Lynn
Physics , 2003, DOI: 10.1103/PhysRevB.69.054415
Abstract: We have measured the magnetic field dependence of the paramagnetic to the field-induced high temperature antiferroquadrupolar magnetically ordered phase transition is CeB6 from 0 to 60 T using a variety of techniques. It is found that the field-dependent phase separation line becomes re-entrant above 35 T and below 10 K. Measurements of resonant ultra-sound, specific heat and neutron diffraction show conclusively that the zero-field temperature-dependent phase transition is to a state with no ordered dipole moments, but with second order transition signatures in both sound attenuation and specific heat.
Log-T divergence and Insulator-to-Metal Crossover in the normal state resistivity of fluorine doped SmFeAsO1-xFx
S. C. Riggs,J. B. Kemper,Y. Jo,Z. Stegen,L. Balicas,G. S. Boebinger,F. F. Balakirev,Albert Migliori,H. Chen,R. H. Liu,X. H. Chen
Physics , 2008,
Abstract: We report the resistivity of a series of fluorine-doped SmFeAsO1-xFx polycrystalline superconductors in magnetic fields up to 60T. For underdoped samples (x < 0.15), the low temperature resistive state is characterized by pronounced magneto-resistance and a resistive upturn at low temperatures. The "insulating behavior" is characterized by a log-T divergence observed over a decade in temperature. In contrast, the normal state for samples with doping x > 0.15 display metallic behavior with little magnetoresistance, where intense magnetic fields broaden the superconducting transition rather than suppress Tc. The location of the insulator-to metal crossover coincides with the reported suppression of the structural phase transition (SPT)in the phase diagram for SmFeAsO1-xFx series.
Bounding the pseudogap with a line of phase transitions in YBCO cuprate superconductors
Arkady Shekhter,B. J. Ramshaw,Ruixing Liang,W. N. Hardy,D. A. Bonn,Fedor F. Balakirev,Ross D. McDonald,Jon B. Betts,Scott C. Riggs,Albert Migliori
Physics , 2012, DOI: 10.1038/nature12165
Abstract: Close to optimal doping, the copper oxide superconductors show 'strange metal' behavior, suggestive of strong fluctuations associated with a quantum critical point. Such a critical point requires a line of classical phase transitions terminating at zero temperature near optimal doping inside the superconducting 'dome'. The underdoped region of the temperature-doping phase diagram from which superconductivity emerges is referred to as the 'pseudogap' because evidence exists for partial gapping of the conduction electrons, but so far there is no compelling thermodynamic evidence as to whether the pseudogap is a distinct phase or a continuous evolution of physical properties on cooling. Here we report that the pseudogap in YBCO cuprate superconductors is a distinct phase, bounded by a line of phase transitions. The doping dependence of this line is such that it terminates at zero temperature inside the superconducting dome. From this we conclude that quantum criticality drives the strange metallic behavior and therefore superconductivity in the cuprates.
Informe sobre el Manual de bendición de hábito, vestición y profesión de novicios
Antonio Francesco Migliori Ceffalo
Summa Humanitatis , 2009,
Abstract: Los manuscritos ilustrados más antiguos provienen del Antiguo Egipto, hacia la época del Nuevo Imperio (1550-1080 a. C.), con el denominado rollo del Libro de los Muertos; pero el arte de pintar miniaturas y de ilustrar los libros tuvo también un papel relevante en el desarrollo de la pintura románica y gótica, así como en otras etapas de la historia de la pintura. Según la tradición medieval, existía la costumbre de ilustrar y decorar con pinturas el texto de ciertos manuscritos –libros de horas, misales, obras piadosas, libros de caballerías o tratados de caza, por ejemplo–. Este artículo describe un documento manuscrito (c. 1719) utilizado por las órdenes religiosas para el ceremonial de acceso a los probantes al convento.
Book review: Tuberculosis: The Essentials. Fourth edition
G.B. Migliori
European Respiratory Review , 2011,
Inverse Problem on Heat Conduction in Heterogeneous Medium  [PDF]
Albert Schwab
American Journal of Computational Mathematics (AJCM) , 2014, DOI: 10.4236/ajcm.2014.41003

Under consideration is a nonclassical stationary problem on heat conduction in a body with the pre-set surface temperature and heat flow. The body contains inclusions at unknown locations and with unknown boundaries. The body and inclusions have different constant thermal conductivities. The author explores the possibility of locating inclusions. The article presents an integral criterion based on which a few statements on identification of inclusions in a body are proved.

Post Mid-Staffordshire Inquiries Reaction, in and about the National Health Service (NHS), England. The Missing Pieces: Organizational, Care and Virtue Ethics Perspectives  [PDF]
Albert Coleman
International Journal of Clinical Medicine (IJCM) , 2014, DOI: 10.4236/ijcm.2014.516131

The release of the Mid Staffordshire hospital report otherwise called the Francis report once again ignited the debate about the issue of abuse of especially vulnerable patients, while navigating the care pathway as inpatients in hospitals; within the National health service (NHS), England. Once more the official reaction from the NHS directorate is more “standards” to monitor failed standards in patient care. Of interest in the official responses so far, are the unheard voices addressing the issue of healthcare and organizational ethics concerns that need revisiting. This article seeks to revisit practice, systems and care issues leading to incidents of the type of the Staffordshire abuses, and the important but yet unheralded place of organizational and care ethics in helping to curb such abuses from re-occurring.

Road Traffic Accidents in Ghana: A Public Health Concern, and a Call for Action in Ghana, (and the Sub-Region)  [PDF]
Albert Coleman
Open Journal of Preventive Medicine (OJPM) , 2014, DOI: 10.4236/ojpm.2014.411092
Abstract: This paper highlights the increasing problem of road traffic accident (RTA) related morbidity and mortality in Ghana, and the public health measures needed to control the problem. Descriptive data in the public domain from statutory bodies and media houses reports on country RTA information, as well as academic papers on the problem, were used as source of information about the problem. The observed trend in Ghana indicates that RTA related fatalities and injuries continue to be increasing, as morbidity and mortality factors since the year 2000. Most of the remedial measures suggested in academic papers, and state agencies measures to curb the RTA trend in Ghana to date, have discussed the problem in terms of injury and safety issues/measures. This paper suggests that the increasing RTAs with associated morbidity and mortality in Ghana need to be looked at more as a public health problem and priority that requires prompt tackling using a public health problem orientated approach and measures, than just as a safety problem due to RTAs’, as is currently done.
New Wideband Notch Antennas for Communication Systems  [PDF]
Albert Sabban
Wireless Engineering and Technology (WET) , 2016, DOI: 10.4236/wet.2016.72008
Abstract: Wireless communication industry is in rapid growth in the last years. Due to the huge progress in development of communication systems in the last decade development of wideband communication systems is continuous growth. However, development of wideband efficient antennas is one of the major challenges in development of wideband wireless communication systems. Low cost compact antennas are crucial in the development of communication systems. Printed notch antennas and miniaturization techniques are employed to develop efficient compact notch antennas. Fractal technology is used to improve the electrical performance and efficiency of notch antennas. Design tradeoffs, computed and measured results of wideband notch antennas with high efficiency are presented in this paper. All antennas are analyzed by using 3D full-wave software. The paper presents new compact Ultra-Wideband notch antenna 1 GHz to 6 GHz, a wideband notch antenna 2.1 GHz to 7.8 GHz and a 5.8 GHz to 18 GHz fractal notch antenna.
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