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Primordial bubbles of colour superconducting quark matter
Luis Masperi,Milva Orsaria
Physics , 2003, DOI: 10.1142/S0218271804005547
Abstract: We analyze the possibility that bubbles of quark matter surviving the confinement phase transition might have become colour superconducting due to the enormous compression suffered by them. Because of the relatively high temperature of the process we compare the initially unpaired quark matter with the colour-flavour locked alternative when the extremely large chemical potential could have increased the critical temperature sufficiently and find that this latter phase would be more stable before the bubble compression stops. If other physical effects have not affected completely their stability, these bubbles might still exist today and perhaps be observed as strangelets.
Hard component of ultra-high energy cosmic rays and vortons
Luis Masperi,Milva Orsaria
Physics , 2000, DOI: 10.1016/S0927-6505(01)00119-0
Abstract: Observed events of ultra-high energy cosmic rays may indicate a hard component for the energy spectrum of their flux, which might have origin in the decay of long-lived vortons presumably condensed in the galactic halo. To be consistent with the needed present density, vortons may have been formed during the breaking of an abelian symmetry contained in a large GUT group like E6 and a part of them could have survived the destabilization caused by the electroweak transition.
Baryogenesis through gradual collapse of vortons
Luis Masperi,Milva Orsaria
Physics , 1998, DOI: 10.1142/S0217751X99001664
Abstract: We evaluate the matter-antimatter asymmetry produced by emission of fermionic carriers from vortons which are assumed to be destabilized at the electroweak phase transition.The velocity of contraction of the vorton, calculated through the decrease of its magnetic energy, originates a chemical potential which allows a baryogenesis of the order of the observed value. This asymmetry is not diluted by reheating if the collapse of vortons is distributed along an interval of ~ 10^-9 sec.
Comparison of UHECR spectra from necklaces and vortons
Luis Masperi,Milva Orsaria
Physics , 2000,
Abstract: Cosmic rays of energy higher than 10^19 eV may be explained by topological defects produced in the early stages of universe. Two suitable alternatives are: necklaces formed by magnetic monopoles connected by strings, and vortons which are loops stabilized by superconducting currents. The former are uniformly distributed in the universe, may account for cosmic rays above the ankle, suffer a transient GZK cutoff with a subsequent recovery and isotropy of observations is expected. The latter are concentrated in the galactic halo, require an additional extragalactic contribution between the ankle and the GZK cutoff, beyond which give a harder component and predict anisotropy related to mass concentration.
Arquitetura do sono diurno e ciclo vigília-sono em enfermeiros nos turnos de trabalho
De Martino, Milva Maria Figueiredo;
Revista da Escola de Enfermagem da USP , 2009, DOI: 10.1590/S0080-62342009000100025
Abstract: this study aimed to observe the architecture of day sleeping after a night of work, and the characteristics of the sleep-wake cycle in nurses working in different shifts. the study was performed at the hospital de clínicas da faculdade de medicina de ribeir?o preto, usp. the sleep-wake cycle was evaluated through the sleep diary in (n=36) subjects, with an average age of 30 years. of these, only five performed polysomnography measurements at the sleep laboratory. subjects presented better night sleep and the polysomnography recordings identified short periods of day sleep with incomplete cycles. subjects woke up many times, which characterizes poor sleep efficiency.
Estudo comparativo de padr?es de sono em trabalhadores de enfermagem dos turnos diurno e noturno
Martino,Milva Maria Figueiredo de;
Revista Panamericana de Salud Pública , 2002, DOI: 10.1590/S1020-49892002000800004
Abstract: objective. to compare sleep patterns in nurses working day and night shifts in a hospital in campinas (sp), brazil. methods. fifty-nine nurses between 23 and 59 years of age participated in the study. for day shift workers, the pattern of nocturnal sleep was examined; for night shift workers, nocturnal and diurnal sleep patterns were examined. during 1 week, participants filled out a sleep diary right after waking up. the following items were assessed: time going to bed, falling asleep, and waking up; sleep latency; duration in hours of nocturnal and diurnal sleep; naps; quality of sleep; mode of waking up; and comparison between the sleep recorded in the diary with the usual sleep. personal and professional information was also collected. results. day shift workers went to bed at 23h36min, and night workers at 23h52min (p > 0.05). the nurses working a day schedule woke up earlier (7h3min) than those working a night schedule when they slept at night (8h30min) (p £ 0.004, wilcoxon). mean sleep latency was 23min26s for day shift nurses versus 22min50s for night shift nurses; the duration of nocturnal sleep was 7h11min and 9h6min, respectively. only day workers took naps (mean 2h3min). the average diurnal sleep of night shift nurses was fractionated (two periods, mean time asleep 4h7min and 2h38min). the quality of the nocturnal sleep of night shift workers was better than that of day shift workers. the mean period working in a hospital was 14.31 years for day workers versus 7.07 for night shift workers (p £ 0.05, wilcoxon). the study participants had healthy habits, especially concerning alcohol consumption. we verified the use of antihypertensives, diuretics, and analgesics. conclusions. the present findings are similar to those previously described in the literature. night shift nurses should be able to take naps to compensate for the sleep deficit accrued when they work at night.
Estudo comparativo de padr es de sono em trabalhadores de enfermagem dos turnos diurno e noturno
Martino Milva Maria Figueiredo de
Revista Panamericana de Salud Pública , 2002,
Abstract: Objetivo. Comparar os padr es de sono de enfermeiros dos turnos diurno e noturno em um hospital de Campinas (SP), Brasil. Métodos. Participaram 59 enfermeiros entre 23 e 59 anos. Para os enfermeiros do dia, analisou-se o sono noturno, e, para os da noite, os sonos diurno e noturno. Os informantes preencheram um diário do sono durante 1 semana, ao acordar. Foram analisados hora de ir deitar, de dormir, e de acordar; latência do sono; horas de sono noturno e diurno; cochilos; qualidade do sono; modo de acordar; e compara o do sono registrado no diário com o sono habitual. Também foram coletadas informa es pessoais e profissionais. Resultados. O grupo diurno ia dormir às 23h36min e o grupo noturno, às 23h52min (P <=0,004, Wilcoxon). Os enfermeiros diurnos acordavam mais cedo (7h3min) do que os noturnos quando dormiam à noite (8h30min). A latência média do sono foi de 23min26s para os enfermeiros diurnos contra 22min50s para os noturnos; a dura o do sono noturno foi de 7h11min e 9h6min, respectivamente. O cochilo esteve presente apenas no grupo diurno (média de 2h3min). O sono diurno dos enfermeiros da noite foi caracterizado pelo fracionamento (dois períodos, tempo de sono de 4h7min e 2h38min). O sono noturno do grupo noturno foi de melhor qualidade. O tempo médio de trabalho em hospital foi de 14,31 anos no grupo diurno contra 7,07 no grupo noturno (P <=0,05, Wilcoxon). Os sujeitos possuíam hábitos saudáveis, principalmente quanto ao consumo de álcool. Verificou-se uso de anti-hipertensivos, diuréticos e analgésicos. Conclus es. Os achados foram semelhantes aos descritos anteriormente. Seria recomendável que os enfermeiros do turno da noite pudessem tirar cochilos para compensar o déficit de sono durante a atividade noturna.
Color flavor locked phase transition in strange quark matter
Orsaria, Milva;Rodrigues, H.;Duarte, S. B.;
Brazilian Journal of Physics , 2007, DOI: 10.1590/S0103-97332007000100008
Abstract: we discuss macroscopic aspects of quark matter phase transition in cold dense stellar matter, considering global charge neutrality and baryonic charge conservation. we determine the critical condition for the phase transition between the strange quark matter, sqm, and the color-flavor locked, cfl, superconducting phase. we also discuss the sensitivity of our results to variations in the gap energy, d, and in the current strange quark mass, ms0. the phase transition is calculated taking into account the baryonic density dependence of the quark masses in dense baryonic medium.
Impact of Rotation on the Structure and Composition of Neutron Stars
Fridolin Weber,Milva Orsaria,Rodrigo Negreiros
Physics , 2013,
Abstract: Depending on mass and rotational frequency, gravity compresses the matter in the core regions of neutron stars to densities that are several times higher than the density of ordinary atomic nuclei. At such huge densities atoms themselves collapse, and atomic nuclei are squeezed so tightly together that new particle states may appear and novel states of matter, foremost quark matter, may be created. This feature makes neutron stars superb astrophysical laboratories for a wide range of physical studies. And with observational data accumulating rapidly from both orbiting and ground based observatories spanning the spectrum from X-rays to radio wavelengths, there has never been a more exiting time than today to study neutron stars. The Hubble Space Telescope and X-ray satellites such as Chandra and XMM-Newton in particular have proven especially valuable. New astrophysical instruments such as the Five hundred meter Aperture Spherical Telescope (FAST), the square kilometer Array (skA), Fermi Gamma-ray Space Telescope (formerly GLAST), and possibly the International X-ray Observatory (now Advanced Telescope for High ENergy Astrophysics, ATHENA) promise the discovery of tens of thousands of new non-rotating and rotating neutron stars. The latter are referred to as pulsars. This paper provides a short overview of the impact of rotation on the structure and composition of neutron stars. Observational properties, which may help to shed light on the core composition of neutron stars--and, hence, the properties of ultra-dense matter--are discussed.
Stress no cotidiano da equipe de enfermagem e sua correla??o com o cronótipo
Ferreira, Luciane Ruiz Carmona;De Martino, Milva Maria Figueiredo;
Estudos de Psicologia (Campinas) , 2009, DOI: 10.1590/S0103-166X2009000100007
Abstract: the purpose of present study was to classify the chronotype of nursing staff, in order to identify the presence of stress and its correlation with chronotype and working hours. the study was conducted at a private hospital in the city of limeira, in the state of s?o paulo, with 87 subjects from different sectors and work shifts. the instruments used were: lipp's stress symptom inventory and a self-assessment questionnaire to determine morningness-eveningness in human circadian rhythms. we ascertained that 74.7% of the individuals were acclimated to shift working; however, 55.4% of them presented symptoms of stress - thereby demonstrating a significant statistical correlation (fisher′s exact test, p=0.035).we also witnessed stress in subjects with a greater length of service in the institution, with a significant difference (fisher's exact test, p=0.003). most subjects were acclimated to their work shifts, in accordance with their personal chronotype, nevertheless even with these individuals stress could be observed, leading to the confirmation of data obtained in other research as to the stressful nature of the profession.
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