409 research outputs found
On the Bound States in a Non-linear Quantum Field Theory of a Spinor Field with Higher Derivatives
We consider a model of quantum field theory with higher derivatives for a
spinor field with quartic selfinteraction. With the help of the Bethe-Salpeter
equation we study the problem of the two particle bound states in the "chain"
approximation. The existence of a scalar bound state is established.Comment: 14 pages, no figures, LaTe
Analysis of Short-term Steel Corrosion Products Formed in Tropical Marine Environments of Panama
The phases and compositions of the corrosion products of a mild steel (A-36) and two weathering steels (A-588 and COR 420) formed after 3 months exposure to the tropical marine atmosphere of Panama were examined using FTIR and Mössbauer spectroscopy. The results show that amorphous or crystallized iron oxyhydroxides goethite α-FeOOH and lepidocrocite γ-FeOOH are early corrosion products. Maghemite γ-Fe2O3 and magnetite Fe3O4 have also been identified and found to be prominent components for steels exposed to the most aggressive conditions. The formation of akaganeite β-FeOOH was observed when chlorides were occluded within the rust. FTIR showed the presence of hematite α-Fe2O3 in one sample.The phases and compositions of the corrosion products of a mild steel (A-36) and two weathering steels (A-588 and COR 420) formed after 3 months exposure to the tropical marine atmosphere of Panama were examined using FTIR and Mössbauer spectroscopy. The results show that amorphous or crystallized iron oxyhydroxides goethite α-FeOOH and lepidocrocite γ-FeOOH are early corrosion products. Maghemite γ-Fe2O3 and magnetite Fe3O4 have also been identified and found to be prominent components for steels exposed to the most aggressive conditions. The formation of akaganeite β-FeOOH was observed when chlorides were occluded within the rust. FTIR showed the presence of hematite α-Fe2O3 in one sample
Personal values and entrepreneurial intention: an empirical study
From a cognitive perspective, the study of the psychosocial characteristics of new
entrepreneurs continues to attract more and more attention among researchers. Nevertheless,
the identification of individual values and the effect they exert on the decision to become an
entrepreneur is clearly an under-researched area of study. Social psychology has shown that
values may cause behaviour by promoting positive attitudes and action-planning. This study
examines the value-intention link in entrepreneurship on a sample of 1467 Spanish university
students. Schwartz’s Portrait Value Questionnaire (PVQ) is used to measure values. Results
confirm the positive effects of openness to change and self-enhancement values on the
entrepreneurial intentio
Review of some classical gravitational superenergy tensors using computational techniques
We use computational algorithms recently developed by us to study completely
four index divergence free quadratic in Riemann tensor polynomials in GR. Some
results are new and some other reproduce and/or correct known ones. The
algorithms are part of a Mathematica package called Tools of Tensor Calculus
(TTC)[web address: http://baldufa.upc.es/ttc
ESTUDIO DEL EFECTO ESTACIONAL SOBRE LA CORROSIÓN ATMOSFÉRICA INICIAL DE ACEROS DE BAJO CARBONO EN LA CIUDAD DE PANAMÁ
In this work, the atmospheric corrosivity of a low carbon steel A-36 is assessed after exposure to the environment of Panama City (Main Campus of the University of Panama). Seasonal effect was determined by exposing, both, during dry and rainy season. The levels of contaminants (Cl- y SO2) observed during this study were lower than those obtained in previous studies (MICAT-Panama). The extrapolated corrosion values were 13 m/year, for steels that were exposed beginning in the dry and rainy season, respectively. Corrosivity was classified as C2 according to ISO. By using Mössbauer spectroscopy and Fourier transform Infrared analysis it was determined that the nature of the initial corrosion products was season dependent. Rust obtained from steels with exposure started during dry season was initially composed of amorphous and hydrated ferric oxyhydroxides; whereas during the rainy season it was a mixture of lepidocrocite (-FeOOH) and goethite (-FeOOH). After short periods, lepidocrocite and goethite constituted both types of samples. The amount of goehtite increased with time of exposition. No spinel phase could be identified. En este trabajo se presentan los resultados de la evaluación de la corrosividad atmosférica sobre un acero de bajo carbono A-36, expuesto a la intemperie en la ciudad de Panamá (Campus Central de la Universidad de Panamá). Se determinó el efecto estacional de la exposición tanto en la época seca como en la época lluviosa. Los niveles de deposición de contaminantes (Cl-y SO2) observados durante el periodo de estudio, febrero 2002-febrero 2003, fueron menores que los observados en estudios previos (MICAT-Panamá). Las velocidades de corrosión en este estudio fueron menores a las obtenidas en el MICAT-Panamá. El valor extrapolado de la velocidad de corrosión fue de 13 m/año y 19m/año, para aceros cuyo inicio de exposición fue en la época seca y en la época lluviosa, respectivamente. La clasificación ISO de corrosividad fue C2, baja corrosividad. Mediante espectroscopia Mössbauer y el análisis infrarrojo de transformada de Fourier se determinó que la naturaleza de los productos iniciales de corrosión dependía de la época del año. La herrumbre obtenida en aceros con exposición iniciada en época seca está constituida inicialmente por oxihidróxidos férricos amorfos e hidratados; mientras que en la época lluviosa la herrumbre es una mezcla de lepidocrocita (-FeOOH) y goethita (-FeOOH). En periodos cortos, ambos tipos de muestras están formados por lepidocrocita y goethita. Las cantidades de goethita crecen con el tiempo de exposición. No se obtuvo fases de espinela
Estudio del efecto estacional sobre la corrosión atmosférica inicial de aceros de bajo carbono en la ciudad de Panamá
En este trabajo se presentan los resultados de la evaluación de la corrosividad
atmosférica sobre un acero de bajo carbono A-36, expuesto a la intemperie en la
ciudad de Panamá (Campus Central de la Universidad de Panamá). Se determinó el
efecto estacional de la exposición tanto en la época seca como en la época lluviosa.
Los niveles de deposición de contaminantes (Cly
SO2) observados durante el
periodo de estudio, febrero 2002-febrero 2003, fueron menores que los observados
en estudios previos (MICAT-Panamá). Las velocidades de corrosión en este estudio
fueron menores a las obtenidas en el MICAT-Panamá. El valor extrapolado de la
velocidad de corrosión fue de 13 m/año y 19m/año, para aceros cuyo inicio de
exposición fue en la época seca y en la época lluviosa, respectivamente. La
clasificación ISO de corrosividad fue C2, baja corrosividad. Mediante
espectroscopia Mössbauer y el análisis infrarrojo de transformada de Fourier se
determinó que la naturaleza de los productos iniciales de corrosión dependía de la
época del año. La herrumbre obtenida en aceros con exposición iniciada en época
seca está constituida inicialmente por oxihidróxidos férricos amorfos e hidratados;
mientras que en la época lluviosa la herrumbre es una mezcla de lepidocrocita
(-FeOOH) y goethita (-FeOOH). En periodos cortos, ambos tipos de muestras
están formados por lepidocrocita y goethita. Las cantidades de goethita crecen con el
tiempo de exposición. No se obtuvo fases de espinel
Functional movement screen differences between male and female young judokas athletes
Background and Study Aim: The Functional Movement Screen (FMS) test has been used in different sports to identify the alterations and asymmetries in the basic movement patterns of the athletes, although it has not been analysed as widely in children population, and even less in judo. The cognitive objective of this study was knowledge about the basic motor competence and the probability of injury in children practicing judo through the evaluation of fundamental movement patterns using the FMS test, and to establish a comparison between genders. Material and Methods: Thirty young judokas (16 girls and 14 boys) participated in the study. The performance of each participant was digitally recorded by two cameras, one in each plane (front and sagittal), and was later analysed jointly by two evaluators who are experts in the use of FMS. Results: The girls obtained higher scores on the sum of the seven tests, compared to boys (16.00 ±1.79 vs. 13.57 ±2.59; p = 0.005). In particular, girls scored significantly better than boys in the deep squat, the rotary stability and the active straight leg raise tasks (p<0.05). The boys scored statistically significantly higher than girls in the trunk stability push up task (p<0.05). Conclusions: The girls scored higher on most tasks, indicating better fundamental movement patterns. In addition, most girls scored above 14 points, while most boys scored at or below 14 points, which may indicate decreased motor competence and increased risk of injury in boys
Phylogenetic analyses and toxigenic profiles of Fusarium equiseti and Fusarium acuminatum isolated from cereals from Southern Europe
Fusarium equiseti and Fusarium acuminatum are toxigenic species that contaminate cereal crops from
diverse climatic regions. They are common in Spanish cereals. The information available on their
phylogenetics and toxigenic profiles is, however, insufficient to assist risk evaluation. In this work,
phylogenetic analyses were performed using partial sequences of the translation elongation factor gene
(EF-1a) of F. equiseti and F. acuminatum strains isolated from barley and wheat from Spain and other
countries. The Northern and Southern European F. equiseti strains largely separated into two phylogenetically
distinct clusters. This suggests the existence of two distinct populations within this species,
explaining its presence in these regions of markedly different climate. Production of type A and B
trichothecenes by the Spanish strains, examined in wheat cultures using a multitoxin analytical method,
indicated that F. equiseti could produce deoxynivalenol and nivalenol and other trichothecenes, at
concentrations that might represent a significant risk of toxin contamination for Southern European
cereals. F. acuminatum showed low intraspecific genetic variability and 58% of the strains could produce
deoxynivalenol at low level. Neither species was found to produce T-2 or HT-2 toxins. The present results
provide important phylogenetic and toxigenic information essential for the accurate prediction of
toxigenic risk
The Effects of Tissue Flossing on Perceived Knee Pain and Jump Performance: A Pilot Study
Background: Tissue compression and partial vascular occlusion using band flossing results in reperfusion of blood to the muscle tissue that may ultimately reduce joint pain and increase range of motion, enhancing prevention from or rehabilitation of injury. However, the extent of research examining the effect of tissue flossing in an athletic setting is currently very limited, and the effects of band flossing on knee pain and jump performance have not yet been investigated and remain unclear. Purpose: To investigate the effect of band flossing on perceived knee pain and vertical jump performance in recreational athletes with knee pain. Methods: Five young male recreational athletes with previously reported knee pain took part in this study (age 22±0.5; height 184±6.8cm; weight 79±1.5kg; BMI 23.34±1.2 kg/m2). Participants performed a number of tests pre and post intervention, with the application of a floss band on the knee joint. The experimental protocol consisted in the performance of countermovement jump (CMJ) tests (without occlusion, with occlusion, and after occlusion). Pre and Post intervention measures included a perceived knee pain -by visual analogue scale (VAS)- and CMJ performance -by force platform-. Results: The application of flossing bands in knee joint resulted in enhancements in all test measures pre to post intervention (10% jump height; 4.5% time in the air; 5% jump velocity; 13% jump power; 7.5% jump force). Participants reported a 3.5-point pain enhancement in AVS during performance of CMJ tests. Conclusion: Flossing bands caused a reduction in perceived knee pain and improved vertical jump performance in young male recreational athletes
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