235 research outputs found
Genotype by environment interactions for body weight in Mediterranean buffaloes using reaction norm models
Pressure effects on the structural and superconducting transitions in LaâCoâSnââ
La3Co4Sn13 is a superconducting material with transition temperature at Tc = 2.70 K, which
presents a superlattice structural transition at T
â â 150 K, a common feature for this class of
compounds. However, for this material, it is not clear that at T
â
the lattice distortions arise from
a charge density wave (CDW) or from a distinct microscopic origin. Interestingly, it has been
suggested in isostructural non-magnetic intermetallic compounds that T
â
can be suppressed to zero
temperature, by combining chemical and external pressure, and a quantum critical point is argued
to be observed near these critical doping/pressure. Our study shows that application of pressure
on single-crystalline La3Co4Sn13 enhances Tc and decreases T
â
. We observe thermal hysteresis
loops for cooling/heating cycles around T
â
for P & 0.6 GPa, in electrical resistivity measurements,
which are not seen in x-ray diffraction data. The hysteresis in electrical measurements may be due
to the pinning of the CDW phase to impurities/defects, while the superlattice structural transition
maintains its ambient pressure second-order transition nature under pressure. From our experiments
we estimate that T
â
vanishes at around 5.5 GPa, though no quantum critical behavior is observed
up to 2.53 GPa
How the 'plates' of a health system can shift, change and adjust during economic recessions: A qualitative interview study of public and private health providers in Brazil's Sao Paulo and Maranhao states
Background:
Economic recessions carry an impact on population health and access to care; less is known on how health systems adapt to the conditions brought by a downturn. This particularly matters now that the COVID-19 epidemic is putting health systems under stress. Brazil is one of the worldâs most affected countries, and its health system was already experiencing the aftermath of the 2015 recession.
Methods:
Between 2018 and 2019 we conducted 46 semi-structured interviews with health practitioners, managers and policy-makers to explore the impact of the 2015 recession on public and private providers in prosperous (SĂŁo Paulo) and impoverished (MaranhĂŁo) states in Brazil. Thematic analysis was employed to identify drivers and consequences of system adaptation and coping strategies. Nvivo software was used to aid data collection and analysis. We followed the Standards for Reporting Qualitative Research to provide an account of the findings.
Results:
We found the concept of âhealth sector crisisâ to be politically charged among healthcare providers in SĂŁo Paulo and MaranhĂŁo. Contrary to expectations, the public sector was reported to have found ways to compensate for diminishing federal funding, having outsourced services and adopted flexibleâif insecureâworking arrangements. Following a drop in employment and health plans, private health insurance companies have streamlined their offer, at times at the expenses of coverage. Low-cost walk-in clinics were hit hard by the recession, but were also credited for having moved to cater for higher-income customers in MaranhĂŁo.
Conclusions:
The âplatesâ of a health system may shift and adjust in unexpected ways in response to recessions, and some of these changes might outlast the crisis. As low-income countries enter post-COVID economic recessions, it will be important to monitor the adjustments taking place in health systems, to ensure that past gains in access to care and job security are not eroded
Quantitative nanoscale vortex-imaging using a cryogenic quantum magnetometer
Microscopic studies of superconductors and their vortices play a pivotal role
in our understanding of the mechanisms underlying superconductivity. Local
measurements of penetration depths or magnetic stray-fields enable access to
fundamental aspects of superconductors such as nanoscale variations of
superfluid densities or the symmetry of their order parameter. However,
experimental tools, which offer quantitative, nanoscale magnetometry and
operate over the large range of temperature and magnetic fields relevant to
address many outstanding questions in superconductivity, are still missing.
Here, we demonstrate quantitative, nanoscale magnetic imaging of Pearl vortices
in the cuprate superconductor YBCO, using a scanning quantum sensor in form of
a single Nitrogen-Vacancy (NV) electronic spin in diamond. The sensor-to-sample
distance of ~10nm we achieve allows us to observe striking deviations from the
prevalent monopole approximation in our vortex stray-field images, while we
find excellent quantitative agreement with Pearl's analytic model. Our
experiments yield a non-invasive and unambiguous determination of the system's
local London penetration depth, and are readily extended to higher temperatures
and magnetic fields. These results demonstrate the potential of quantitative
quantum sensors in benchmarking microscopic models of complex electronic
systems and open the door for further exploration of strongly correlated
electron physics using scanning NV magnetometry.Comment: Main text (5 pages, 4 figures) plus supplementary material (5 pages,
6 figures). Comments welcome. Further information under
http://www.quantum-sensing.c
The combination of three faecal parasitological methods to improve the diagnosis of schistosomiasis mansoni in a low endemic setting in the state of CearĂĄ, Brazil
Concordance between expected and observed bacilloscopy results of clinical forms of leprosy: a 6-year retrospective study in Recife, State of Pernambuco, Brazil
Determinants of the organization of diabetes mellitus care in user satisfaction
The objective of the study was analyze user satisfaction determinants of patients with Diabetes Mellitus (DM) regarding the outpatient clinic specialties at the Health Centre of the School. Qualitative cross-sectional study was carried out in outpatient specialty with 20 users with diagnosis of DM. We adopted the method of semi-structured interview using a scripting guide. We used Atlas it software 7.0 to aid in the decoding of speech, and analyzed it by content analysis. The empirical material encoded enabled to observe that the most evident themes are related to organizational accessibility and the relationship between user and service staff in perspective of longitudinality. It was observed the outpatient identifying clinic specialties as a regular source of care and dissatisfaction with regard to service accessibility.O objetivo do estudo foi analisar os determinantes da satisfação do usuĂĄrio com Diabetes Mellitus (DM) sobre o atendimento no ambulatĂłrio de especialidades de um Centro de SaĂșde Escola. O estudo transversal com abordagem qualitativa foi desenvolvido no ambulatĂłrio de especialidades com 20 usuĂĄrios com diagnĂłstico de DM. Foram aplicadas entrevistas semiestruturadas por meio de um roteiro norteador. Utilizou-se software Atlas ti 7.0 para auxĂlio na codificação das falas e tĂ©cnica de AnĂĄlise de ConteĂșdo para anĂĄlise dos dados. Como resultado, observou-se que os temas mais evidenciados estĂŁo relacionados Ă acessibilidade organizacional e Ă relação entre usuĂĄrio, equipe e serviço na perspectiva da longitudinalidade. Observou-se a identificação do ambulatĂłrio de especialidade como fonte regular de cuidado e a insatisfação no que se refere Ă acessibilidade ao serviço.
Portuguese and Brazilian guidelines for the treatment of depression: exercise as medicine
NITROGEN SOURCES AND DOSES ON GROWTH AND QUALITY OF SEEDLINGS OF Cassia grandis AND Peltophorum dubium 1
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