Magnetism in palladium has been the subject of much work and speculation. Bulk crystalline palladium is paramagnetic with a high magnetic susceptibility. Palladium under pressure and palladium nanoclusters have generated interest to scrutinize its magnetic properties. Here we report another possibility: Palladium may become an itinerant ferromagnet in the amorphous bulk phase at atmospheric pressure. Atomic palladium is a d 10 element, whereas bulk crystalline Pd is a d 10−x (sp) x material; this, together with the possible presence of unsaturated bonds in amorphous materials, may explain the remnant magnetism reported herein. This work presents and discusses magnetic effects in bulk amorphous palladium.
The first successful theory of superconductivity was the one proposed by Bardeen, Cooper and Schrieffer in 1957. This breakthrough fostered a remarkable growth of the field that propitiated progress and questionings, generating alternative theories to explain specific phenomena. For example, it has been argued that Bismuth, being a semimetal with a low number of carriers, does not comply with the basic hypotheses underlying BCS and therefore a different approach should be considered. Nevertheless, in 2016 based on BCS we put forth a prediction that Bi at ambient pressure becomes a superconductor at 1.3 mK. A year later an experimental group corroborated that in fact Bi is a superconductor with a transition temperature of 0.53 mK, a result that eluded previous work. So, since Bi is superconductive in almost all the different structures and phases, the question is why Bi-IV has been elusive and has not been found yet to superconduct? Here we present a study of the electronic and vibrational properties of Bi-IV and infer its possible superconductivity using a BCS approach. We predict that if the Bi-IV phase structure were cooled down to liquid helium temperatures it would also superconduct at a Tc of 4.25 K.
Bismuth displays puzzling superconducting properties. In its crystalline equilibrium phase, it does not seem to superconduct at accessible low temperatures. However, in the amorphous phase it displays superconductivity at ~ 6 K. Under pressure bismuth has been found to superconduct at Tcs that go from 3.9 K to 8.5 K depending on the phase obtained. So the question is: what electronic or vibrational changes occur that explains this radical transformation in the conducting behavior of this material? In a recent publication we argue that changes in the density of electronic and vibrational states may account for the behavior observed in the amorphous phase with respect to the crystal. We have now undertaken an ab initio computational study of the effects of pressure alone maintaining the original crystalline structure and compressing our supercell computationally. From the results obtained we infer that if the crystal structure remains the same (except for the contraction), no superconductivity will appear.
Tipología: Artículo de investigación científica y tecnológica Para citar este artículo: García-Avendaño DJ, Ochoa-Estrada MC, Briceño-Rodríguez II. Actitud del personal de enfermería ante la muerte de la persona en la unidad de cuidados intensivos: estudio cuantitativo. Duazary. 2018 septiembre; 15 (3): 281-293. Doi: http://dx. RESUMENEn el presente estudio se buscó determinar la actitud de la enfermera ante la muerte de la persona en la unidad de cuidados intensivos. Se realizó un estudio descriptivo no probabilístico, con un muestreo a conveniencia en el que participaron 30 profesionales de enfermería adscritos a una institución de segundo nivel en el estado de Durango, México. Se utilizó el Cuestionario de Actitudes ante la Muerte (CAM), elaborado a partir de la revisión del Death Attitudes and Self-Reported Health -Relevant Behaviors, en una versión cubana. Este incluye 33 reactivos, agrupados para su interpretación en seis sub-escalas: evitación, aceptación, temor, pasaje, salida y perspectiva profesional. Los hallazgos permitieron concluir que el profesional de enfermería está preparado para cuidar la vida, considerando que, a nivel general, acepta la muerte como un hecho inevitable. No obstante, desde la perspectiva profesional del personal de enfermería, la muerte es considerada como un alivio, al ver la carga que evidencian los familiares del paciente en su proceso final. ABSTRACTIn the present study we seek to determine the attitude of nurses towards a person's death process in the intensive care unit. A descriptive, non-probabilistic study was carried out, using convenience sampling of 30 nursing professionals 1. Universidad Juárez del Estado de Durango, México. Correo: gdavidjahel@yahoo.com -https://orcid.org/0000-0002-8323-4421 2. Universidad Juárez del Estado de Durango, México. Correo: cristy8@ujed.mx -https://orcid.org/assigned to a second level institution in the state of Durango, Mexico. The questionnaire on Attitudes to Death (CAM), based on the review of Death Attitudes and Self-Reported Health -Relevant Behaviors, was used in a Cuban version. It includes 33 reactants, grouped in six sub-scales for analysis: avoidance, acceptance, fear, passage, departure and professional perspective. The findings allowed to conclude that the professional nursing is prepared to take care of life, considering that they accept death as an inevitable fact. Nevertheless, from the professional perspective of the nurse practitioner, death is considered as a relief, taking into account the workload experienced by the relatives in the process of death.
All solid phases of bismuth under pressure, but one, have been experimentally found to superconduct. From Bi-I to Bi-V, avoiding Bi-IV, they become superconductors and perhaps Bi-IV may also become superconductive. To investigate the influence of the electronic properties N(E ) and the vibrational properties F(ω) on their superconductivity we have ab initio calculated them for the corresponding experimental crystalline structures, and using a BCS approach have been able to determine their critical temperatures T c obtaining results close to experiment: For Bi-I (The Wyckoff Phase) we predicted a transition temperature of less than 1.3 mK and a year later a T c of 0.5 mK was measured; for Bi-II T c is 3.9 K measured and 3.6 K calculated; Bi-III has a measured T c of 7 K and 6.5 K calculated for the structure reported by Chen et al ., and for Bi-V T c ~ 8 K measured and 6.8 K calculated. Bi-IV has not been found to be a superconductor, but we have recently predicted a T c of 4.25 K.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.