Estudio preliminar de unos restos de simios pliocénicos procedentes de "coda Bonica" (Gavá) (Prov. Barcelona)

Los materiales objeto de este estudio me han sido confiados por el Dr. J. F. DE VILLALTA, el cual agradezco aqui su amabilidad, así como el haber realizado la traducción del presente trabajo. La mandíbula pertenece al Instituto de Paleobiología del Consejo Superior de Investigaciones Científicas que dirige el Dr. L. VÍA y las dos piezas restantes, halladas por J. ULLASTREy A. MASRIERA, a las colecciones del Departamento de Ecología del Cuaternario del Instituto "Jaime Almera" (C.S.I.C.) de Barcelona. (...

Estudio preliminar de unos restos de simios pliocénicos procedentes de "coda Bonica" (Gavá) (Prov. Barcelona)

Los materiales objeto de este estudio me han sido confiados por el Dr. J. F. DE VILLALTA, el cual agradezco aqui su amabilidad, así como el haber realizado la traducción del presente trabajo. La mandíbula pertenece al Instituto de Paleobiología del Consejo Superior de Investigaciones Científicas que dirige el Dr. L. VÍA y las dos piezas restantes, halladas por J. ULLASTREy A. MASRIERA, a las colecciones del Departamento de Ecología del Cuaternario del Instituto "Jaime Almera" (C.S.I.C.) de Barcelona. (...

An early modern human outside Africa

Analysis of two fossils from a Greek cave has shed light on early hominins in Eurasia. One fossil is the earliest known specimen of Homo sapiens found outside Africa; the other is a Neanderthal who lived 40,000 years later

(The) relation of the prophets to the social problems of the eighth century ..

Typewritten sheets in cover. Thesis (M.A.)--Boston University This item was digitized by the Internet Archive. Bibliography, 3 p

Experimental device for obtaining calibration factor for the total count technique

Nuclear technologies have widely used on industry plants in order to help to solve troubles processes/design or just obtain information of them. The Total Count technique for flow measurement has as main advantages: being an absolute technique, because it is independent of additional devices readings unless the directly used for recording the radioactive cloud, requiring only a single detector to provide the final result; the independence of the internal volume of the transport duct, can be applied in the presence or absence of obstructions; no restriction as to the nature of the product or material to be conveyed; it is a noninvasive technique which allows real-time diagnostics. To use Total Count Technique, knowledge of a geometric calibration factor is required. Called Factor F, it is obtained in the laboratory using an experimental apparatus to faithfully reproduce the geometry of the detection system and the pipeline that being analyzed and using the same radiotracer, therefore, its value is constant for each specific measuring system under survey. This experimental apparatus for obtaining the factor F consisting by a pipe of 2 "PVC, which simulates a transmission line, where they were deposited 500 ml oil and the use of a specific pipette for use viscous fluids were added sequentially aliquots (50.00 ± 0.01) μl radiotracer (radionuclide photopeak energy of 198 Au 411.8 keV) and analyzing data obtained by three distinct detection systems composed of detectors NaI scintillators 1" x 1" and a data acquisition system

Optimal portfolio selection with stochastic maximum downside risk and uncertain implicit transaction costs

Published ArticleA multi-stage stochastic optimal portfolio policy that minimizes downside risk in the presence of uncertain implicit transaction costs is proposed. As asset returns in economic recessions and booms are characterised by extreme movements, some individual stocks show an extreme reaction while others exhibit a milder reaction. The study therefore considers a risk-averse and conservative investor who is highly concerned about the performance of his portfolio in an economic recession environment. Maximum negative deviation is taken as the downside risk and stochastic programming is applied with stochastic data given in the form of a scenario tree. A set of discrete scenarios of asset returns is considered, taking the deviation around each return scenario. Thus uncertainties of asset returns and implicit transaction costs are represented by discrete approximations of a multi-variate continuous distribution. The portfolio is rebalanced at discrete time intervals as new information on returns get realised. First-stage optimal-portfolio results show that implicit transaction costs vary from 7.1% to 16.7% of returns on investment

Quantifying Diversification Effects of A Portfolio Using the Generalised Extreme Value Distribution- Archimedean Gumbel Copula Model

This paper uses the Generalized Extreme Value Distribution - Archimedean Gumbel copula modelling approach to quantify diversification effects in a bivariate portfolio of financial asset returns. This paper estimates Value at Risk (VaR) and Expected Shortfall (ES) of a portfolio consisting of the South African Industrial and Financial Indices using Monte-Carlo simulation. Results show that the portfolio risks are smaller than the sum of the individual component risks, indicating diversification benefits for investors. This approach is valuable for assessing, preparing, and mitigating risks in investment decisions, particularly for international investors considering cross-market diversification

Avaliação da associação estatística num diagrama de dispersão por estudantes universitários

Neste texto relata-se um estudo sobre a avaliação da associação e predição estatística por estudantes universitários, antes e depois de abordarem essa temática no ensino formal. No estudo participaram 57 estudantes moçambicanos, que frequentavam no ano letivo de 2011/2012 o 2.º ano de um curso de formação de professores de matemática do ensino secundário. Os estudantes foram inquiridos através de um questionário, sendo aqui explorada apenas uma das seis questões nele incluídas e em que é representada uma distribuição bidimensional através de um diagrama de dispersão. Globalmente, os estudantes revelaram dificuldades em obter as respostas corretas, exibiram conceções limitadas e não adequadas de avaliação da associação estatística e o ensino teve um impacto limitado na melhoria das respostas dos estudantes