1,644 research outputs found
ZnO:Co Diluted Magnetic Semiconductor or Hybrid Nanostructure for Spintronics?
We have studied the influence of intrinsic and extrinsic defects in the
magnetic and electrical transport properties of Co-doped ZnO thin films. X ray
absorption measurements show that Co substitute Zn in the ZnO structure and it
is in the 2+ oxidation state. Magnetization (M) measurements show that doped
samples are mainly paramagnetic. From M vs. H loops measured at 5 K we found
that the values of the orbital L and spin S numbers are between 1 and 1.3 for L
and S = 3/2, in agreement with the representative values for isolated Co 2+.
The obtained negative values of the Curie-Weiss temperatures indicate the
existence of antiferromagnetic interactions between transition metal atoms.Comment: To be published in Journal of Materials Scienc
Beyond Cookie Monster Amnesia:Real World Persistent Online Tracking
Browser fingerprinting is a relatively new method of uniquely identifying
browsers that can be used to track web users. In some ways it is more
privacy-threatening than tracking via cookies, as users have no direct control
over it. A number of authors have considered the wide variety of techniques
that can be used to fingerprint browsers; however, relatively little
information is available on how widespread browser fingerprinting is, and what
information is collected to create these fingerprints in the real world. To
help address this gap, we crawled the 10,000 most popular websites; this gave
insights into the number of websites that are using the technique, which
websites are collecting fingerprinting information, and exactly what
information is being retrieved. We found that approximately 69\% of websites
are, potentially, involved in first-party or third-party browser
fingerprinting. We further found that third-party browser fingerprinting, which
is potentially more privacy-damaging, appears to be predominant in practice. We
also describe \textit{FingerprintAlert}, a freely available browser extension
we developed that detects and, optionally, blocks fingerprinting attempts by
visited websites
Investigating Fingerprinters and Fingerprinting-Alike Behaviour of Android Applications
Fingerprinting of browsers has been thoroughly investigated. In contrast, mobile phone applications offer a far wider array of attributes for profiling, yet fingerprinting practices on this platform have hardly received attention. In this paper, we present the first (to our knowledge) investigation of Android libraries by commercial fingerprinters. Interestingly enough, there is a marked difference with fingerprinting desktop browsers. We did not find evidence of typical fingerprinting techniques such as canvas fingerprinting. Secondly, we searched for behaviour resembling that of commercial fingerprinters. We performed a detailed analysis of six similar libraries. Thirdly, we investigated ∼ 30,000 apps and found that roughly 19% of these apps is using one of the these libraries. Finally, we checked how often these libraries were used by apps subject to the Children’s Online Privacy Protection Act (i.e. apps targeted explicitly at children), and found that these libraries were included 21 times
Body composition, nutritional profile and muscular fitness affect bone health in a sample of schoolchildren from Colombia: The Fuprecol Study
This is the final version of the article. Available from the publisher via the DOI in this record.The objective of the present study is to investigate the relationships between body
composition, nutritional profile, muscular fitness (MF) and bone health in a sample of children
and adolescents from Colombia. Participants included 1118 children and adolescents (54.6% girls).
Calcaneal broadband ultrasound attenuation (c-BUA) was obtained as a marker of bone health.
Body composition (fat mass and lean mass) was assessed using bioelectrical impedance analysis.
Furthermore height, weight, waist circumference and Tanner stage were measured and body mass
index (BMI) was calculated. Standing long-jump (SLJ) and isometric handgrip dynamometry were
used respectively as indicators of lower and upper body muscular fitness. A muscular index score
was also computed by summing up the standardised values of both SLJ and handgrip strength.
Dietary intake and degree of adherence to the Mediterranean diet were assessed by a 7-day recall
questionnaire for food frequency and the Kidmed questionnaire. Poor bone health was considered
using a z-score cut off of ≤−1.5 standard deviation. Once the results were adjusted for age and
Tanner stage, the predisposing factors of having a c-BUA z-score ≤−1.5 standard deviation included
being underweight or obese, having an unhealthy lean mass, having an unhealthy fat mass, SLJ
performance, handgrip performance, and unhealthy muscular index score. In conclusion, body
composition (fat mass and lean body mass) and MF both influenced bone health in a sample of
children and adolescents from Colombia. Thus promoting strength adaptation and preservation in
Colombian youth will help to improve bone health, an important protective factor against osteoporosis
in later life.: We would like to acknowledge to Bogota District Education Department for supporting data
collection for this study. The authors also thank the participating Bogota District students, teachers, schools, and
staff. The “FUPRECOL Study” was possible given the financial support provided by the Instituto Colombiano
para el Desarrollo de la Ciencia y la Tecnología “Francisco José de Caldas” COLCIENCIAS (Contract Number
671-2014 Code 122265743978). Also, during the completion of this paper, AG-H was visiting researchers at
the University of Rosario (CEMA, Bogotá, Colombia), supported with grants awarded by Proyectos Basales y
Vicerrectoría de Investigación, Desarrollo e Innovación” (Universidad de Santiago de Chile, USACH)
Soluble Triggering Receptor Expressed on Myeloid cells-1 in bronchoalveolar lavage fluid is not predictive for ventilator-associated pneumonia
Síntomas de pacientes antes de la primera hospitalización por Síndrome Coronario Agudo
Este estudo objetivou caracterizar os pacientes quanto ao relato da presença de sintomas de dor torácica, dispneia e limitação das atividades diárias uma semana antes da primeira hospitalização por Síndrome Coronariana Aguda, segundo a forma de apresentação clínica, e compará-las. Estudo transversal, descritivo e correlacional. Utilizou-se um instrumento de avaliação clínica que investigou a presença e a gravidade dos sintomas de dispneia, precordialgia e restrição física decorrentes da isquemia do miocárdio. Com relação à limitação para realização de atividades físicas, pacientes com diagnóstico de angina instável mostraram maior comprometimento na semana que antecedeu a internação, assim como relataram a presença de dispneia e precordialgia com maior frequência do que os pacientes infartados em situações que vão desde realizarem grandes esforços como, por exemplo, caminhar na subida ou muito rápido no plano, até situações de repouso ou de pequenos esforços.The objective of this study was to characterize and compare patients regarding their report of experiencing chest pain, dyspnea and limitation of the daily life activities one week before their first hospitalization due to Acute Coronary Syndrome, according to the clinical presentation form, and compare them. This is a cross-sectional, descriptive and correlational study. A clinical evaluation instrument was used to investigate the presence and severity of dyspnea, chest pain and physical restriction due to myocardial ischemia. Regarding the limitation to carry out physical activities, patients diagnosed with unstable angina showed lower capacity the week before hospitalization, and reported experiencing dyspnea and chest pain more frequently than patients who had an infarction in situations ranging from making strong efforts, such as walking uphill or on a flat surface but very quickly, to resting and in situations of little effort.Estudio que objetivó caracterizar a pacientes en cuanto al relato de presencia de síntomas de dolor torácico, disnea y limitación de actividades diarias una semana antes de la primera hospitalización por Síndrome Coronario Agudo, según la forma de presentación clínica, y compararlas. Estudio transversal, descriptivo y correlacional. Se utilizó un instrumento de evaluación clínica que investigó la presencia y gravedad de síntomas de disnea, precordialgia y restricción física derivadas de isquemia de miocardio. En relación a limitaciones para realización de actividades físicas, pacientes con diagnóstico de angina inestable mostraron mayor compromiso en la semana que antecedió a la internación, así como relataron la presencia de disnea y precordialgia con mayor frecuencia que en los pacientes infartados en situaciones tales como realizar grandes esfuerzos como, por ejemplo, caminar en pendiente ascendiente o muy rápido en el llano, hasta situaciones de reposo o pequeños esfuerzos
Functional performance and social relations among the elderly in Greater Metropolitan Belo Horizonte, Minas Gerais State, Brazil: a population-based epidemiological study
Reversed halo sign in pneumocystis pneumonia: a case report
<p>Abstract</p> <p>Background</p> <p>The reversed halo sign may sometimes be seen in patients with cryptogenic organizing pneumonia, but is rarely associated with other diseases.</p> <p>Case presentation</p> <p>We present a case study of a 32-year-old male patient with acquired immunodeficiency syndrome, who had previously been treated with chemotherapy for non-Hodgkin's lymphoma. A chest X-ray showed bilateral patchy infiltrates. High-resolution computed tomography revealed the reversed halo sign in both upper lobes. The patient was diagnosed with pneumocystis pneumonia, which was successfully treated with sulfamethoxazole trimethoprim; the reversed halo sign disappeared, leaving cystic lesions. Cases such as this one are rare, but show that the reversed halo sign may occur in patients who do not have cryptogenic organizing pneumonia.</p> <p>Conclusion</p> <p>Physicians can avoid making an incorrect diagnosis and prescribing the wrong treatment by carefully evaluating all clinical criteria rather than assuming that the reversed halo sign only occurs with cryptogenic organizing pneumonia.</p
The anti-adherence effect of Lippia sidoides Cham: extract against microorganisms of dental biofilm
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