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DeBenedictis A.,Energy and Environmental Economics Inc. | Miller D.,Stanford University | Moore J.,Stanford University | Olson A.,University of Pennsylvania | Woo C.K.,UC
Electricity Journal | Year: 2011

The numerous benefits of electricity forward trading come at a cost to consumers when a forward price contains a risk premium. An analysis based on the theory of cross hedging suggests that there is a risk premium of about 5 percent in the forward price for delivery at the Mid-Columbia hub of the Pacific Northwest. The existence of a relatively large risk premium suggests that forward contract buyers are more risk-averse than sellers. © 2011 Elsevier Inc.

Marques J.,UA | Azevedo M.R.,UA | Neto J.A.N.,Federal University of Ceara | Pereira A.J.S.C.,UC | Artur A.C.,Claro
Comunicacoes Geologicas | Year: 2014

The main objective of this investigation was to assess the viability of the commercial exploitation of the Serra Branca monzogranite as dimension stone. The Serra Branca massif belongs to a large late tectonic plutonic complex of Brasilian age (≈ 600 Ma), known in the literature as Quixeramobim batholith, that crops out in the Ceará Central Domain (NE Brazil). The work involved detailed geological mapping of a small sector of the batholith, petrography of the main lithologies and, at a subsequent stage, selection of a subset of samples from the Serra Branca monzogranite for technological and radiological characterization. The technological properties of the analysed samples satisfy the requirements proposed by ABNT NBR 15844 (2010) and ASTM C- 615 (2005) for use as building materials. On the other hand, the gamma index values (I) and radon exhalation rates are also low, certifying the quality of Serra Branca monzogranite as potential natural stone resources. © 2014, LNEG – Laboratório Nacional de Geologia e Energia IP.

Guerrero A.R.,UC | Agudo T.N.,UCLM
CEUR Workshop Proceedings | Year: 2015

The objective of this study was to identify the specialization profiles which are most required by companies and organizations in Lima, through the analysis of job postings published in the Internet. Text Mining techniques were used to extract relevant information and to identify some generic skills for the Peruvian statisticians. For purposes of this study, we analyzed 2,809 job postings published in the Blog "Estadísticos de Perú" [2], between 2009 and 2014. We have identified many requirements, knowledge and specific skills that companies and organizations were looking for. After that, job postings were segmented using Singular Value Decomposition (SVD) of the Terms and Documents Matrix. In addition, five segments were discovered, corresponding to specific competency profiles of statisticians, where each one has different types of knowledge and specific skills.

Demark-Wahnefried W.,University of Alabama at Birmingham | Colditz G.A.,Washington University in St. Louis | Rock C.L.,University of California at San Diego | Sedjo R.L.,Aurora University | And 8 more authors.
Breast Cancer Research and Treatment | Year: 2015

Obesity is a poor prognostic factor and is negatively related to quality of life (QOL) in breast cancer survivors. Exercise and Nutrition to Enhance Recovery and Good Health for You is the largest weight loss trial completed among cancer survivors. Percent losses in body weight with an intensive group-based intervention versus an attention control were 6.0 versus 1.5 % (p < 0.0001) and 3.7 versus 1.3 % (p < 0.0001) at 12 and 24 months, respectively. ENERGY also was designed to answer the research question: Does weight loss significantly improve vitality and physical function (key components of QOL)? 692 breast cancer survivors (BMI: 25–45 kg/m2) at 4 US sites were randomized to a year-long intensive intervention of 52 group sessions and telephone counseling contacts versus a non-intensive (control) of two in-person counseling sessions. Weight, self-reported QOL, and symptoms were measured semi-annually for two years. Significant decreases in physical function and increases in symptoms were observed among controls from baseline to 6 months, but not in the intervention arm, −3.45 (95 % Confidence Interval [CI] −6.10, −0.79, p = 0.0109) and 0.10 (95 %CI 0.04, 0.16, p = 0.0021), respectively. Improvements in vitality were seen in both arms but trended toward greater improvement in the intervention arm −2.72 (95 % CI −5.45, 0.01, p = 0.0508). These differences diminished over time; however, depressive symptoms increased in the intervention versus control arms and became significant at 24 months, −1.64 (95 % CI −3.13, −0.15, p = 0.0308). Increased QOL has been reported in shorter term diet and exercise trials among cancer survivors. These longer term data suggest that diet and exercise interventions improve some aspects of QOL, but these benefits may diminish over time. © 2015, Springer Science+Business Media New York.

Moreno R.,UC | Vega J.,CIEMAT | Dormido S.,Spanish University for Distance Education (UNED)
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2016

This article shows a conformal prediction application to disruption prediction from scratch. Considering data from ILW experimental campaigns (both hydrogen and deuterium campaigns), a one-layer disruption predictor has been tested from scratch. The results show a relevant improvement where the success rate (rate of disruptions predicted correctly) increases and the false alarm rate (rate of non-disruptive discharges misclassified) decreases, using conformal prediction (CP) rather than conventional methodology from scratch. CP from scratch achieves a success rate of 100% with the first model and only one disruptive discharge. © Springer International Publishing Switzerland 2016.

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