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Temuco, Chile

University of the Frontier or UFRO is a university in Temuco Chile. It is a derivative university and part of the Chilean Traditional Universities. UFRO boasts a student body with a variety of abilities and from a variety of backgrounds, many of them are Mapuche descent. Wikipedia.

Letelier Gonzalez V.C.,University of the Frontier | Moriconi G.,Marche Polytechnic University
Engineering Structures | Year: 2014

In this paper the behavior of three beam-column joints under cyclic loading was analyzed. The concrete joints, manufactured in a scale of 2/3 with respect to current size, were designed with reference to Eurocode 8, one made with ordinary concrete and the other two made with concrete containing 30% coarse recycled concrete aggregates as a partial replacement of the coarse natural aggregates, by taking into proper account the lower tensile strength and elastic modulus of the recycled aggregate concrete.The experimental results allowed to observe a behavior under cyclic loading of the concrete made with 30% replacement of natural by recycled aggregates quite similar to ordinary concrete. © 2013 Elsevier Ltd. Source

Balart L.,University of Burgundy | Balart L.,University of the Frontier | Vagenas E.C.,Kuwait University
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2014

In this work we construct a family of spherically symmetric, static, charged regular black hole metrics in the context of Einstein-nonlinear electrodynamics theory. The construction of the charged regular black hole metrics is based on three requirements: (a) the weak energy condition should be satisfied, (b) the energy-momentum tensor should have the symmetry T00=T11, and (c) these metrics have to asymptotically behave as the Reissner-Nordström black hole metric. In addition, these charged regular black hole metrics depend on two parameters which for specific values yield regular black hole metrics that already exist in the literature. Furthermore, by relaxing the third requirement, we construct more general regular black hole metrics which do not behave asymptotically as a Reissner-Nordström black hole metric. © 2014 The Authors. Source

Manterola C.,University of the Frontier
Cochrane database of systematic reviews (Online) | Year: 2011

For decades, the indication of analgesia in patients with Acute Abdominal Pain (AAP) has been deferred until the definitive diagnosis has been made, for fear of masking symptoms, generating a change in the physical exploration or obstructing the diagnosis of a disease requiring surgical treatment. This strategy has been questioned by some studies that have shown that the use of analgesia in the initial evaluation of patients with AAP leads to a significant reduction in pain without affecting diagnostic accuracy. To determine whether the evidence available supports the use of opioid analgesics in the diagnostic process of patients with AAP. Trials were identified through searches in Cochrane Controlled Trials Register (CENTRAL) (The Cochrane Library, issue 2, 2009), MEDLINE (1966 to 2009) and EMBASE (1980 to 2009). A randomised controlled trial (RCT) filter for a MEDLINE search was applied (with appropriate modification for an EMBASE search). Trials also were identified through "related articles". The search was not limited by language or publication status. All published RCTs which included adult patients with AAP, without gender restriction, comparing any opioids analgesia regimen with the non-use of analgesic before any intervention and independent of the results. Two independent reviewers assessed the studies identified via the electronic search. Articles that were relevant and pertinent to the aims of the study were selected and their respective full-text versions were collected for subsequent blinded evaluation. The allocation concealment was considered in particular as an option to diminish the biases.The data collected from the studies were reviewed qualitatively and quantitatively using the Cochrane Collaboration statistical software RevMan 5.0. After performing the meta-analysis, the chi-squared test for heterogeneity was applied. In situations of significant clinical heterogeneity, statistical analyses were not applied to the pool of results. In situations of heterogeneity, the random effect model was used to perform the meta-analysis of the results. A sensitivity analysis was also applied based on the evaluation to the methodological quality of the primary studies. Eight studies fulfilled the inclusion criteria. Differences with use of opioid analgesia were verified in variables: Change in the intensity of the pain, change in the patients comfort level. The use of opioid analgesics in the therapeutic diagnosis of patients with AAP does not increase the risk of diagnosis error or the risk of error in making decisions regarding treatment. Source

Seron P.,University of the Frontier
The Cochrane database of systematic reviews | Year: 2014

When two or more cardiovascular risk factors occur in one individual, they may interact in a multiplicative way promoting cardiovascular disease. Exercise has proven to be effective in controlling individual risk factors but its effect on overall cardiovascular risk remains uncertain. To assess the effects of exercise training in people with increased cardiovascular risk but without a concurrent cardiovascular disease on general cardiovascular mortality, incidence of cardiovascular events, and total cardiovascular risk. A search was conducted in CENTRAL (The Cochrane Library 2013, Issue 10 of 12), Ovid MEDLINE (1946 to week 2 November 2013), EMBASE Classic + EMBASE via Ovid (1947 to Week 47 2013), CINAHL Plus with Full Text via EBSCO (to November 2013), Science Citation Index Expanded (SCI-EXPANDED) (1970 to 22 November 2013), and Conference Proceedings Citation Index - Science (CPCI-S) (1990 to 22 November 2013) on Web of Science (Thomson Reuters). We did not apply any date or language restrictions. Randomized clinical trials comparing aerobic or resistance exercise training versus no exercise or any standard approach that does not include exercise. Participants had to be 18 years of age or older with an average 10-year Framingham risk score of 10% for cardiovascular disease over 10 years, or with two or more cardiovascular risk factors, and no history of cardiovascular disease. The selection of studies and subsequent data collection process were conducted by two independent authors. Disagreements were solved by consensus. The results were reported descriptively. It was not possible to conduct a meta-analysis because of the high heterogeneity and high risk of bias in the included studies. A total of four studies were included that involved 823 participants, 412 in the exercise group and 411 in the control group. Follow-up of participants ranged from 16 weeks to 6 months. Overall, the included studies had a high risk of selection, detection, and attrition bias. Meta-analysis was not possible because the interventions (setting, type and intensity of exercise) and outcome measurements were not comparable, and the risk of bias in the identified studies was high. No study assessed cardiovascular or all-cause mortality or cardiovascular events as individual outcomes. One or more of the studies reported on total cardiovascular risk, low-density lipoprotein (LDL) and high-density lipoprotein (HDL) cholesterol, blood pressure, body mass index, exercise capacity, and health-related quality of life but the available evidence was not sufficient to determine the effectiveness of exercise. Adverse events and smoking cessation were not assessed in the included studies. Evidence to date is entirely limited to small studies with regard to sample size, short-term follow-up, and high risk of methodological bias, which makes it difficult to derive any conclusions on the efficacy or safety of aerobic or resistance exercise on groups with increased cardiovascular risk or in individuals with two or more coexisting risk factors. Further randomized clinical trials assessing controlled exercise programmes on total cardiovascular risk in individuals are warranted. Source

Balart L.,University of the Frontier | Vagenas E.C.,Kuwait University
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2014

We construct several charged regular black hole metrics employing mass distribution functions which are inspired by continuous probability distributions. Some of these metrics satisfy the weak energy condition and asymptotically behave as the Reissner-Nordström black hole. In each case, the source to the Einstein equations corresponds to a nonlinear electrodynamics model, which in the weak field limit becomes the Maxwell theory (compatible with the Maxwell weak field limit or approximation). Furthermore, we include other regular black hole solutions that satisfy the weak energy condition, and some of them correspond to the Maxwell theory in the weak field limit. © 2014 American Physical Society. Source

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