6,629 research outputs found

    Phase transition of quantum corrected Schwarzschild black hole

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    We study the thermodynamic phase transition of a quantum-corrected Schwarzschild black hole. The modified metric affects the critical temperature which is slightly less than the conventional one. The space without black holes is not the hot flat space but the hot curved space due to vacuum fluctuations so that there appears a type of Gross-Perry-Yaffe phase transition even for the very small size of black hole, which is impossible for the thermodynamics of the conventional Schwarzschild black hole. We discuss physical consequences of the new phase transition in this framework.Comment: 12 pages, 4 figures, added : version accepted for publication in PL

    An Analytic Equation of State for Ising-like Models

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    Using an Environmentally Friendly Renormalization we derive, from an underlying field theory representation, a formal expression for the equation of state, y=f(x)y=f(x), that exhibits all desired asymptotic and analyticity properties in the three limits x→0x\to 0, x→∞x\to \infty and x→−1x\to -1. The only necessary inputs are the Wilson functions γλ\gamma_\lambda, ÎłÏ•\gamma_\phi and ÎłÏ•2\gamma_{\phi^2}, associated with a renormalization of the transverse vertex functions. These Wilson functions exhibit a crossover between the Wilson-Fisher fixed point and the fixed point that controls the coexistence curve. Restricting to the case N=1, we derive a one-loop equation of state for 2<d<42< d<4 naturally parameterized by a ratio of non-linear scaling fields. For d=3d=3 we show that a non-parameterized analytic form can be deduced. Various asymptotic amplitudes are calculated directly from the equation of state in all three asymptotic limits of interest and comparison made with known results. By positing a scaling form for the equation of state inspired by the one-loop result, but adjusted to fit the known values of the critical exponents, we obtain better agreement with known asymptotic amplitudes.Comment: 10 pages, 2 figure

    Defining Honesty: A Qualitative Analysis of the Trait Honesty

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    A popular theoretical model in personality psychology is the Five Factor Model, or the Big Five. This model is structured to have five superordinate factors; Extraversion, Agreeableness, Conscientious, Neuroticism, and Openness (McCrae & Costa, 2003). Each of these factors includes numerous facets that contribute to each of the superordinate traits. However, there is some controversy over what these facets incorporate. For example, Agreeableness, according consists of straightforwardness, altruism, compliance, modesty, and tender-mindedness (Costa & McCrae, 1995). However, the factor of Agreeableness, as defined by the Big Five Model, lacks an important personality variable: honesty. Honesty can be conceptualized as acting in a manner consistent with ones values and beliefs in addition to telling the truth. It is displayed by someone who has a tendency to be fair and genuine towards others (Hilbig, Zettler, & Heydasch, 2011). Honesty has been viewed to be an important personality trait, as evidenced by honesty being consistently listed as one of the most desirable qualities in a romantic partner (citation). If honesty is such an important personality trait, it should be incorporated into a well-established model of personality. Although the Big Five does not incorporate honesty into the model, a different personality theory, the HEXACO (Honesty-Humility, Emotionality, eXtraversion, Agreeableness (versus Anger), Conscientiousness, Openness to Experience) model, has emerged which does factor in honesty. This theory is based on the lexical approach using data from different languages. The HEXACO model incorporates a sixth factor in addition to the factors included in the Big Five model. This additional trait has been labeled Honesty-Humility, which has been shown to be related to Agreeableness (Ashton & Lee, 2005). Research has shown that this model, with the inclusion of the Honesty-Humility trait, explains incremental variance beyond the classical ïŹve‐factor approach (Hilbig, Zettler, & Heydasch, 2011). Although the lexical approach, which investigates the importance of personality traits by looking at the presence of descriptive words for the trait within a given language (citation – I think Allport but double check), is a decent start, it does not address how individuals conceptualize the trait. The lexical approach only investigates whether or not there is a word present in language to explain the trait. Therefore, although the HEXACO model is a decent start at understanding the trait of honesty, it is important to investigate how regular people conceptualize honesty using empirical methods. Consequently, we used open-ended questions as a framework for identifying major themes related to the trait of honesty in the current study. 85 undergraduates participated in the online survey in exchange for course credit. The survey consisted of 8 open-ended questions inquiring into participants perceptions of honesty in addition to demographic questions. These questions asked participants to describe both honest and dishonest situations, as well as the qualities that both honest and dishonest people have. Therefore, we were able to address both individual differences and situational factors that contribute to the conceptualization of honesty. 12 members of the research team read through the responses and identified major themes and commonalities of honesty and dishonesty. The next step for this project is to create a quantitative measure of honesty based on the major themes generated from the open-ended questions and to determine how well this new measure aligns with the measure of honesty developed for the HEXACO model in addition to the Big Five Factor of Agreeableness. By incorporating how individuals conceptualize honesty into the development of the scale, we will be better able to understand the construct through further research

    Social Network Analysis and High Velocity Learning

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    NPS NRP Executive SummarySocial Network Analysis and High Velocity LearningN1 - Manpower, Personnel, Training & EducationThis research is supported by funding from the Naval Postgraduate School, Naval Research Program (PE 0605853N/2098). https://nps.edu/nrpChief of Naval Operations (CNO)Approved for public release. Distribution is unlimited.

    Social Network Analysis and High Velocity Learning

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    NPS NRP Project PosterSocial Network Analysis and High Velocity LearningN1 - Manpower, Personnel, Training & EducationThis research is supported by funding from the Naval Postgraduate School, Naval Research Program (PE 0605853N/2098). https://nps.edu/nrpChief of Naval Operations (CNO)Approved for public release. Distribution is unlimited.

    Next generation sequencing of exceptional responders with BRAF-mutant melanoma: implications for sensitivity and resistance.

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    BackgroundPatients with BRAF mutation-positive advanced melanoma respond well to matched therapy with BRAF or MEK inhibitors, but often quickly develop resistance.MethodsTumor tissue from ten patients with advanced BRAF mutation-positive melanoma who achieved partial response (PR) or complete response (CR) on BRAF and/or MEK inhibitors was analyzed using next generation sequencing (NGS) assay. Genomic libraries were captured for 3230 exons in 182 cancer-related genes plus 37 introns from 14 genes often rearranged in cancer and sequenced to average median depth of 734X with 99% of bases covered &gt;100X.ResultsThree of the ten patients (median number of prior therapies = 2) attained prolonged CR (duration = 23.6+ to 28.7+ months); seven patients achieved either a PR or a short-lived CR. One patient who achieved CR ongoing at 28.7+ months and had tissue available close to the time of initiating BRAF inhibitor therapy had only a BRAF mutation. Abnormalities in addition to BRAF mutation found in other patients included: mutations in NRAS, APC and NF1; amplifications in BRAF, aurora kinase A, MYC, MITF and MET; deletions in CDKN2A/B and PAX5; and, alterations in RB1 and ATM. Heterogeneity between patients and molecular evolution within patients was noted.ConclusionNGS identified potentially actionable DNA alterations that could account for resistance in patients with BRAF mutation-positive advanced melanoma who achieved a PR or CR but whose tumors later progressed. A subset of patients with advanced melanoma may harbor only a BRAF mutation and achieve a durable CR on BRAF pathway inhibitors

    Changes in systolic blood pressure over time in healthy cats and cats with chronic kidney disease

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    BACKGROUND: Hypertension is a common problem in older cats, most often associated with chronic kidney disease (CKD). Cross‐sectional studies have suggested that blood pressure in cats increases with age. HYPOTHESIS/OBJECTIVES: To determine whether blood pressure in cats increases with age and whether this occurs independently of the presence of CKD. To investigate risk factors for developing hypertension. ANIMALS/SUBJECTS: Two hundred and sixty‐five cats with CKD and 133 healthy cats ≄9 years were retrospectively identified. METHODS: Four groups were created according to status at initial evaluation (CKD or healthy) and blood pressure at the last included visit (normotensive [NT] or developed hypertension [DH]): Healthy‐NT, Healthy‐DH, CKD‐NT and CKD‐DH. Systolic blood pressure (SBP) over time slopes were compared with 0 and between groups. Risk factors for the development of hypertension were investigated, and associations of biochemical and clinical variables with SBP were examined. RESULTS: Cats that were hypertensive at CKD diagnosis (n = 105) were not included in further analyses. Twenty‐seven cats with CKD and 9 healthy cats developed hypertension ≄3 months after diagnosis of CKD or their first visit. Systolic blood pressure significantly increased with age in all cats (P < .001). Healthy cats were at less risk than cats with CKD to become hypertensive (hazard ratio 0.2, P < .001), with creatinine being an independent risk factor for the development of hypertension. CONCLUSIONS AND CLINICAL IMPORTANCE: The high prevalence of hypertension in azotemic cats in this study shows the importance of monitoring of SBP in elderly cats, and in particular in cats with CKD
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