José Álvarez Conde: un arqueólogo naturalista, en el centenario de su natalicio

El desarrollo de la arqueología cubana en la primera mitad del siglo XX estuvo acompañado de distinguidas figuras que hicieron importantes aportes a esta ciencia. Entre estos investigadores, José Álvarez Conde constituyó un ejemplo de naturalista y arqueólogo de incansable laboriosidad, que no solamente exploró gran parte del territorio nacional, sino que también publicó una vasta obra literaria y científica donde supo rendir homenaje a sus predecesores, convirtiéndose en un historiador destacado de las ciencias en Cuba. Se rescata aquí parte de la biografía de un arqueólogo que quedó en el olvido y que esperamos comenzar a redescubri

Pasatiempos en la vida militar. Juegos y juguetes en el Castillo de San Severino, Matanzas, Cuba

Se examinan las distintas evidencias asociadas a pasatiempos encontradas en excavaciones arqueológicas realizadas en el Castillo de San Severino, en la provincia de Matanzas, Cuba. Se analiza la información histórica referente a las funciones de la dotación de la fortaleza y sus posibles ratos de ocio apuntando a la confección de juegos en el lugar y la utilización de otros insertados en el ámbito militar

Perfil epidemiológico, clínico y resultados perinatales en pacientes que acuden a Clínica de Atención Preconcepcional en Hospital Nacional de la Mujer, en el periodo de Julio de 2016 a Julio de 2017.

El abordaje de los problemas de salud perinatal debe basarse en la aplicación del enfoque de riesgo, la atención preconcepcional multidisciplinaria, es pilar fundamental para dicho fin. La atención perinatal determina que el embarazo, el parto, el puerperio y la atención del recién nacido sean atendidos en el nivel de complejidad que su grado de riesgo lo requiera

Mexico's 2014 Public Interest Design Award

Design students in Mexico City and Turin, Italy paired up with an NGO in Oaxaca to help a local cooperative build a center for technological innovation. The experimental center is a space to explore low-tech and low-cost innovative technologies, which will lead to a stronger local economy in the future. The built project was designed to incorporate local construction culture and improve thermal properties with local materials, resulting in the use of traditional tejamanil wood shingles and rammed earth walls

Quantum-path signatures in attosecond helical beams driven by optical vortices

High-order harmonic generation (HHG) driven by beams carrying orbital angular momentum has been recently demonstrated as a unique process to generate spatio-temporal coherent extreme ultraviolet (XUV)/x-ray radiation with attosecond helical structure.Weexplore the details of the mapping of the driving vortex to its harmonic spectrum. In particular we show that the geometry of the harmonic vortices is complex, arising from the superposition of the contribution from the short and long quantum paths responsible of HHG. Transversal phase-matching and quantum path interferences provide an explanation of the dramatic changes in theXUVvortex structure generated at different relative positions of the target respect to the laser beam focus. Finally, we show how to take advantage of transversal phase-matching to select helical attosecond beams generated from short or long quantum paths, exhibiting positive or negative temporal chirp respectively.CH-G acknowledges fruitful discussions with Mette B Gaarde and support from the Marie Curie International Outgoing Fellowship within the EUSeventh Framework Programme for Research and Technological Development (2007–2013), under REA grant Agreement No 328334 CH-G, JSR and LP acknowledge support from Junta de Castilla y León (Project SA116U13) and MINECO (FIS2013-44174-P). AP acknowledges financial support of the US Department of Energy, Basic Energy Sciences, Office of Science, under contract No DE-AC02- 06CH11357

Aplicación de procedimientos de adopción y tratamiento contable de la sección 17 propiedades planta y equipo de la norma internacional de información financiera para pequeñas y medianas entidades y su incidencia tributaria y financiera

El objetivo de esta investigación es facilitar la aplicación de los procedimientos de adopción de la sección 17 de la Norma Internacional de Información Financiera su tratamiento contable y su incidencia tributaria. En la investigación del tema referido a ”Aplicación de procedimientos de adopción y tratamiento contable de la sección 17 propiedades, planta y equipo de la Norma Internacional de Información Financiera para pequeñas y medianas entidades y su incidencia tributaria y financiera” se utilizará el Método cualiacuantitativo. Cualitativos porque mediante símbolos verbales se examinará la naturaleza general de los fenómenos. Los estudios cualitativos proporcionan una gran cantidad de información valiosa, pero poseen un limitado grado de precisión, porque emplean términos cuyo significado varía para las diferentes personas, épocas y contextos. Los estudios cualitativos contribuyen a identificar los factores importantes que deben ser medidos y Cuantitativos por medio de símbolos matemáticos se utilizan para la exposición de los datos que provienen de un cálculo o medición. CONCLUSIONES: En el desarrollo de este plan de Investigación, el cual se centra en el estudio y la aplicación de procedimientos de la sección 17 del tratamiento contable de las propiedades planta y equipo, se utilizo el enfoque de las normativas técnicas y legales, y de igual manera durante el proceso de investigación se contó con la ayuda y asesoramiento de profesionales en el campo de la contabilidad lo cual permitió tener información muy importante para el desarrollo de la temática esto ha servido para establecer las siguientes conclusiones: Las empresas que aplican o adoptan la NIIF para las PYMES serán aquellas consideradas como pequeñas y medianas entidades que cumplan con dos condiciones siguientes: -no tienen obligación publica de rendir cuentas, -publican Estados Financieros con propósito de información general para usuarios externos. Al finalizar la investigación y mediante la tabulación de la encuesta dirigida a los estudiantes, se determina a través de sus respuestas que no existe un conocimiento completo que les permita la correcta aplicación práctica contable de las nueva normativa contable de NIIF para PYMES; debido a que no se tiene una capacitación amplia y detallada que contribuya a facilitar el entendimiento apropiado de la norma internacional de información financiera para pequeñas y medianas entidade

Feeding Ecology of Juvenile Spiny Lobster, Panulirus interruptus, on the Pacific Coast of Baja California Sur, Mexico

Many aspects of the early life history of the red lobster Panulirus interruptus are little known, including the relationship between habitat structure, food resource availability, and nutrition of juveniles. We investigated the spatial and temporal differences in food intake, diet composition, and nutritional condition of juveniles at two sites along the Pacific coast of the Baja California Peninsula (Mexico) with contrasting oceanographic and biological conditions. One site (Arvin) is located inside a protected bay, Bahia Tortugas, where the waters are cooler and temperate seagrasses and macroalgae are the dominant benthic flora. The second site (Queen) in Bahia Sebastian Vizcaino was located along a more open coastline where seawater temperatures were higher and the benthic flora more indicative of warmer seas. At both sites, we randomly sampled epifauna within vegetated habitats to estimate the seasonal availability of food resources for juvenile lobsters from autumn 2001 until summer 2002. Concurrently, we used traps to sample P. interruptus juveniles for stomach content analysis. At both sites, Amphipoda, Gastropoda, and Polychaeta dominated the epifauna assemblages, as determined by an Index of Importance. Juvenile P. interruptus primarily consumed crustaceans (mostly amphipods and isopods) and vegetal material (surf-grass Phyllospadix spp. and calcareous algae), but their food spectrum was wide. Manly\u27s Index of Resource Selection indicated that lobsters preferred some prey (e.g., Brachyurans) over others despite their low Index of Importance. Despite marked differences in the types of food and their availability between sites, there were no significant differences in the nutritional condition (e.g., relative weight of the digestive gland) of lobsters at the two sites. However, the nutritional condition of lobsters was effected during some seasons. In particular, their condition deteriorated during the spring (April 2002) at Arvin, as did the proportion of individuals with empty stomachs. This study shows the feeding adaptation capacity of the juvenile California spiny lobster P. interruptus to different environmental conditions prevalent in Centre Baja California Peninsula

Vibrational quenching of CO2(010) by collisions with O(3P) at thermal energies: A quantum-mechanical study

10 pages, 6 figures, 1 table, 1 appendix.-- PACS nrs.: 34.50.Ez; 33.20.Tp; 33.15.Mt; 31.15.Ar.The CO2(010)–O(3P) vibrational energy transfer (VET) efficiency is a key input to aeronomical models of the energy budget of the upper atmospheres of Earth, Venus, and Mars. This work addresses the physical mechanisms responsible for the high efficiency of the VET process at the thermal energies existing in the terrestrial upper atmosphere (150 K ≤ T ≤ 550 K). We present a quantum-mechanical study of the process within a reduced-dimensionality approach. In this model, all the particles remain along a plane and the O(3P) atom collides along the C(2v) symmetry axis of CO2, which can present bending oscillations around the linear arrangement, while the stretching C–O coordinates are kept fixed at their equilibrium values. Two kinds of scattering calculations are performed on high-quality ab initio potential energy surfaces (PESs). In the first approach, the calculations are carried out separately for each one of the three PESs correlating to O(3P). In the second approach, nonadiabatic effects induced by spin-orbit couplings (SOC) are also accounted for. The results presented here provide an explanation to some of the questions raised by the experiments and aeronomical observations. At thermal energies, nonadiabatic transitions induced by SOC play a key role in causing large VET efficiencies, the process being highly sensitive to the initial fine-structure level of oxygen. At higher energies, the two above-mentioned approaches tend to coincide towards an impulsive Landau-Teller mechanism of the vibrational to translational (V-T) energy transfer.This work has been partially supported by the European Project No. R113-2003-506079 and the DGICYT Spanish Grant Nos. FIS2004-02461 and CTQ-2004-02415/BQU. One of the authors (M.P.d.L.-C.) was supported by the "Ramón y Cajal" Programme and another author (M.L.-P.) by the Spanish projects Nos. REN2001-3249/CLI, ESP2004-01556, and by EC FEDER funds. The calculations presented here were performed at CINECA (the SuperComputer Center of the University of Bologna), the Instituto de Matemáticas y Física Fundamental (CSIC), and CESGA (the SuperComputer Center of Galicia).Peer reviewe

Trains of attosecond pulses structured with time-ordered polarization states

[EN]Ultrafast laser pulses generated at the attosecond timescale represent a unique tool to explore the fastest dynamics in matter. An accurate control of their properties, such as polarization, is fundamental to shape three-dimensional laser-driven dynamics. We introduce a technique to generate attosecond pulse trains whose polarization state varies from pulse to pulse. This is accomplished by driving high-harmonic generation with two time-delayed bichromatic counter-rotating fields with proper orbital angular momentum (OAM) content. Our simulations show that the evolution of the polarization state along the train can be controlled via OAM, pulse duration, and time delay of the driving fields. We, thus, introduce an additional control into structured attosecond pulses that provides an alternative route to explore ultrafast dynamics with potential applications in chiral and magnetic materials.Junta de Castilla y León (SA287P18); FEDER funds; Ministerio de Ciencia, Innovación y Universidades (FIS2016-75652-P, RYC-2017-22745, PID2019-106910GBI00); Ministerio de Educación, Cultura y Deporte (FPU16/02591); EuropeanResearch Council (ERC) (851201); Barcelona Supercomputing Center (FI-2019-1-0013)