Non-minimal CW inflation, electroweak symmetry breaking and the 750 GeV anomaly

We study whether the hinted 750 GeV resonance at the LHC can be a Coleman-Weinberg inflaton which is non-minimally coupled to gravity. Since the inflaton must couple to new charged and coloured states to reproduce the LHC diphoton signature, the same interaction can generate its effective potential and trigger the electroweak symmetry breaking via the portal coupling to the Higgs boson. This inflationary scenario predicts a lower bound on the tensor-to-scalar ratio of $r\gtrsim 0.006$, where the minimal value corresponds to the measured spectral index $n_s\simeq0.97$. However, we find that the compatibility with the LHC diphoton signal requires exotic new physics at energy scales accessible at the LHC. We study and quantify the properties of the predicted exotic particles.Comment: 11 pages, 1 figure, 2 tables, revised version published on JHE

Entrepreneurial Investment Evaluation Decision-Making: A Focus on Venture Capitalists, Business Angels and Early-Stage Entrepreneurs in South Africa

Business angels (BAs) and venture capitalists (VCs) are important sources of finance for entrepreneurs in emerging markets for raising start-up and growth capital. Recognising that entrepreneurial investment evaluation decision-making is a highly complex process, and that there are limited studies focused on evaluation criteria used by both BAs and VCs’, this article undertakes an empirical investigation by identifying, classifying and statistically testing the rank importance of investment criteria in South Africa from an early-stage entrepreneurial perspective. Results indicate that the rank importance for the different investment criteria is relatively similar for VCs and BAs, and the only ranking difference observed was on the team preparedness and team attributes, relevant for early-stage entrepreneurs. An empirical study of this nature is important as unique insights emerge from testing multiple investment evaluation criteria used by VCs, BAs and early-stage entrepreneurs in an African emerging country context

Luxación traumática anterior de prótesis total de rodilla

Se presenta un caso de luxación anterior de una prótesis total de rodilla no constreñida que conserva el ligamento cruzado posterior. Su etiopatogenia es diferente a la de las subluxaciones o luxaciones posteriores de prótesis totales de rodilla semiconstreñidas que no conservan el ligamento cruzado posterior. La reducción de la misma se consiguió sin dificultad bajo anestesia general. A pesar de la laxitud residual existente tras el tratamiento conservador, el resultado funcional después de 4 años fue satisfactorio y sin evidenciar nuevos episodios de subluxación o reluxación de la prótesis

Ligand Effects on the Rate and Mechanism of Solvent Exchange at Rhodium(III) and Iridium(III)

The rate constants and activation parameters for solvent exchange for a series of RhIII and IrIII complexes of the form [M(H2O)6]3+ (M = Rh or Ir) and [Cp*M(S)3]2+ (M = Rh or Ir, and S = H2O, MeCN, or Me2SO) have been determined by NMR spectroscopy as a function of free-solvent concentration, temperature, and pressure, and the mechanisms for the respective exchange processes have been inferred

Burnout without a job: An explorative study on a sample of Italian unemployed jobseekers

Background: Search for work is in itself a job and its outcomes are similar to those of job burnout: it can generate feelings of exhaustion, detachment from the commitment to research, and a sense of ineffectiveness. The aim of the present study is to investigate the construct of burnout within the category of long-term unemployed people engaged in job search activity. Design and methods: The study has a cross-sectional, descriptive, and exploratory nature. Two hundred eight Italian unemployed jobseekers compiled an adaptation of the OCS Burnout scale, by Maslach and Leiter. An Exploratory Factor Analysis (EFA) was performed to investigate the psychometric features of the instrument. The relations between the instrument and age and months of job search variables were assessed through Spearman's Rho coefficient of co-graduation. Finally, a MANOVA was carried out. Results: The questionnaire is able to intercept and describe the dimensions of respondents' burnout with respect to four dimensions: Exhaustion, Disengagement, Effectiveness in job search, Disillusion. Correlation analysis shows that the duration of the job search period has a positive relationship with Exhaustion, Disillusion, and Disengagement; a negative relationship with Effectiveness in job search. Finally, MANOVA shows that older unemployed people rate themselves less effective in job searching and more exhausted, compared to younger unemployed people. Conclusions: The psychosocial effects of job search on the unemployed are still little studied, and this research, through the construct of burnout, proposes a comprehensive and articulated key to its understanding

Job Seekers’ Burnout and Engagement: A Qualitative Study of Long-Term Unemployment in Italy

Long-term unemployment has major consequences from an economic, physical and psychosocial perspective. Several authors have pointed out that the search for employment is in itself work, which can generate feelings of exhaustion of psychophysical energies, cynicism and disinvestment, as well as a sense of ineffectiveness to the point of complete disillusion. The construct of burnout can be used to describe this psychological process. This study evaluated the burnout and engagement dimensions in individuals searching for work for a long time, from a qualitative perspective. Fifty-six semi-structured interviews were conducted with a sample of long-term unemployed job seekers (Sardinia, Italy), based on Maslach’s model of burnout (exhaustion, cynicism, effectiveness in job search). The answers to the semi-structured interviews were processed through T-Lab, a semi-automatic textual analysis software. Four thematic cores emerged: exhaustion vs. engagement, cynicism vs. trust, inefficacy vs. efficacy in job search and disillusion vs. hope. This result is consistent with the four-dimensional theoretical model of burnout, originally proposed by Edelwich and Brodsky, recently taken up by Santinello, and framed as the opposite of engagement, as shown in the JD-R model. This study highlights that burnout can describe the psychosocial experiences of long-term unemployed job seekers

Paulo Freire's contributions in teacher training for Youth and Adult Education: an analysis of scientific production from the perspective of Methodi Ordinatio

Este artigo, na forma de pesquisa de revisão bibliográfica sistemática, objetiva identificar a produção científica referente à contribuição de Paulo Freire para a formação de professores, na modalidade de Educação de Jovens e Adultos, EJA. A pesquisa foi realizada com a metodologia denominada Methodi Ordinatio. A questão norteadora foi: Quais as contribuições de Paulo Freire para a formação de professores da modalidade de educação de jovens e adultos? Do ponto de vista da problemática, a pesquisa se caracteriza como de cunho qualitativo, pois visa conhecer o que a literatura apresenta sobre as questões centrais do tema. Como resultado do levantamento, obteve-se, inicialmente, 182 (cento e oitenta e dois) artigos. Após o processo de filtragem e eliminação de duplicatas e títulos não pertencentes à área de pesquisa, restaram 105 (cento e cinco) artigos; dos quais foram lidos o título e o resumo, e verificou-se que 10 (dez) artigos se referem aos temas, em conjunto: formação de professores, educação de jovens e adultos e Paulo Freire. Constatou-se as contribuições de Paulo Freire para a EJA e que existem possibilidades de pesquisa direcionando essas contribuições para a formação de professores nessa modalidade de ensino.This article, in the form of a systematic bibliographic review research, aims to identify the scientific production on the theme of Paulo Freire's contribution to teacher education, in the form of Youth and Adult Education. The research was carried out with the methodology called Methodi Ordinatio. The guiding question was: What are Paulo Freire's contributions to the training of teachers in the youth and adult education modality? From the point of view of the issue, it is characterized by a qualitative nature, as it seeks to know what the literature puts on the central issues of the theme. As a result of the survey, initially 182 articles were obtained, after the process of filtering and eliminating duplicates and titles outside the research area, 105 articles remained. Of these 105, the title and abstract were read and 10 articles referred to teacher training, youth and adult education and Paulo Freire. It was observed in this study that there are research possibilities when directed to the contributions of Paulo Freire with the training of teachers for the education of young people and adults

Mechanical and microstructural features of plasma cut edges in a 15 mm thick S460M steel plate

In general, the thermal cutting processes of steel plates are considered to have an influence on microstructures and residual stress distribution, which determines the mechanical properties and performance of cut edges. They also affect the quality of the surface cut edges, which further complicates the problem, because in most cases the surface is subjected to the largest stresses. This paper studies the influence of plasma cutting processes on the mechanical behavior of the cut edges of steel and presents the characterization results of straight plasma arc cut edges of steel plate grade S460M, 15 mm thick. The cutting conditions used are the standard ones for industrial plasma cutting. The metallography of CHAZ (Cut Heat Affected Zones) and hardness profiles versus distance from plasma cut edge surface are tested; the mechanical behavior of different CHAZ layers under the cut edge surface were obtained by testing of instrumented mini-tensile 300 µm thick specimens. Also, the residual stress distribution in the CHAZ was measured by X-ray diffraction. The results for the mechanical properties, microstructure, hardness, and residual stresses are finally compared and discussed. This work concludes that the CHAZ resulting from the plasma cutting process is narrow (about 700 µm) and homogeneous in plate thickness

Ao redor dos sistemas : os saberes nao-aristotélicos e os limites em sistemas de ensino-aprendizagem

Orientadora : Alexandre Ibrahim DireneDissertaçao (mestrado) - Universidade Federal do Paraná, Setor de Ciencias Exata

Gilbert Damping in Magnetic Multilayers

We study the enhancement of the ferromagnetic relaxation rate in thin films due to the adjacent normal metal layers. Using linear response theory, we derive the dissipative torque produced by the s-d exchange interaction at the ferromagnet-normal metal interface. For a slow precession, the enhancement of Gilbert damping constant is proportional to the square of the s-d exchange constant times the zero-frequency limit of the frequency derivative of the local dynamic spin susceptibility of the normal metal at the interface. Electron-electron interactions increase the relaxation rate by the Stoner factor squared. We attribute the large anisotropic enhancements of the relaxation rate observed recently in multilayers containing palladium to this mechanism. For free electrons, the present theory compares favorably with recent spin-pumping result of Tserkovnyak et al. [Phys. Rev. Lett. \textbf{88},117601 (2002)].Comment: 1 figure, 5page