Study of the Properties of a Biodegradable Polymer Filled with DierentWood Flour Particles

[EN] Lignocellulosic wood flour particles with three different sizes were used to reinforce Solanyl® type bioplastic in three compositions (10, 20, and 30 wt.%) and further processed by melt-extrusion and injection molding to simulate industrial conditions. The wood flour particles were morphologically and granulometric analyzed to evaluate their use as reinforcing filler. The Fuller method on wood flour particles was successfully applied and the obtained results were subsequently corroborated by the mechanical characterization. The rheological studies allowed observing how the viscosity was affected by the addition of wood flour and to recover information about the processing conditions of the biocomposites. Results suggest that all particles can be employed in extrusion processes (shear rate less than 1000 s¿1 ). However, under injection molding conditions, biocomposites with high percentages of wood flour or excessively large particles may cause an increase in defective injected-parts due to obstruction of the gate in the mold. From a processing point of view and based on the biocomposites performance, the best combination resulted in Solanyl® type biopolymer reinforced with wood flour particles loaded up to 20 wt.% of small and medium particles size. The obtained biocomposites are of interest for injected molding parts for several industrial applications.Parres, F.; Peydro, MA.; Juárez Varón, D.; Arrieta, MP.; Aldas, M. (2020). Study of the Properties of a Biodegradable Polymer Filled with DierentWood Flour Particles. Polymers. 12(12):1-24. https://doi.org/10.3390/polym12122974124121

New and improved demonstrations, each illustrating a single scientific paper

Thesis (Ed.M.)--Boston Universit

Clash of Titans: A MUSE dynamical study of the extreme cluster merger SPT-CL J0307-6225

We present MUSE spectroscopy, Megacam imaging, and Chandra X-ray emission for SPT-CL J0307-6225, a z = 0.58 major merging galaxy cluster with a large BCG-SZ centroid separation and a highly disturbed X-ray morphology. The galaxy density distribution shows two main overdensities with separations of 0.144 and 0.017 arcmin to their respective BCGs. We characterize the central regions of the two colliding structures, namely 0307-6225N and 0307-6225S, finding velocity derived masses of M200, N = 2.44 ± 1.41 × 1014M⊙ and M200, S = 3.16 ± 1.88 × 1014M⊙, with a line-of-sight velocity difference of |Δv| = 342 km s-1. The total dynamically derived mass is consistent with the SZ derived mass of 7.63 h70-1 ± 1.36 × 1014M⊙. We model the merger using the Monte Carlo Merger Analysis Code, estimating a merging angle of 36+14-12 ° with respect to the plane of the sky. Comparing with simulations of a merging system with a mass ratio of 1:3, we find that the best scenario is that of an ongoing merger that began 0.96+0.31-0.18 Gyr ago. We also characterize the galaxy population using Hδand [O ii] λ3727 Å lines. We find that most of the emission-line galaxies belong to 0307-6225S, close to the X-ray peak position with a third of them corresponding to red-cluster sequence galaxies, and the rest to blue galaxies with velocities consistent with recent periods of accretion. Moreover, we suggest that 0307-6225S suffered a previous merger, evidenced through the two equally bright BCGs at the centre with a velocity difference of ∼674 km s-1

An improved correlation for heat transfer coefficient of two-phase flow in a vertical tube

2nd Trabzon International Energy and Environment Symposium -- JUL 26-29, 1998 -- KARADENIZ TECH UNIV, TRABZON, TURKEYWOS: 000080610100068A correlation is developed using Lockhard-Martinelli parameters for predicting the heat transfer coefficient during the two phase flow of water-vapor system. An upward flow in a vertical circular pipe at atmospheric conditions is considered. The constants in the correlation have been obtained after 2800 measurements. The accuracy of correlation is found to be 96.5 using t test. Delta T-h(tp) and h(tp) variations are also investigated using measured data.Karadeniz Tech Univ, Turkey, King Fahd Univ Petr & Minerals, Saudi Arabia, Univ Victoria, Canada, Univ Miami, US, Istanbul Tech Univ, Turke

RUIDOS ARTICULARES Y SU RELACIÓN CON LA PRESENCIA DE INTERFERENCIAS OCLUSALES EN EL LADO DE NO TRABAJO, MEDIANTE EVALUACIÓN CLÍNICA EN ADULTOS ENTRE 20 Y 40 AÑOS DE EDAD

Considerada como una articulación glinglimoartrorial, la Articulación Témporo-mandibular (ATM) realiza todos los movimientos en el espacio, sin presentar ningún signo o síntoma en condiciones normales, sin embargo en presencia de anomalías manifiesta ruidos, partiendo de este enfoque nos centramos a analizar si estos ruidos articulares se encuentran relacionados con la oclusión dental, específicamente con la presencia de interferencias oclusales en el lado de no trabajo, en adultos de ambos sexos de entre 20 – 40 años de edad totalmente dentados. De esta forma 31 participantes que presentaron ruidos articulares en los diferentes movimientos mandibulares, fueron evaluados en cuanto a la clase de Angle, guías laterales, presencia de guía canina normal y presencia o ausencia de función de grupo. Analizando clínicamente la presencia de interferencias en el lado de no trabajo y comprobando estas interferencias en articulador semiajustable (ASA) tipo Bioart. Los datos obtenidos fueron analizados en el programa SPSS versión XX, revelando una relación entre los ruidos articulares y la presencia de interferencias oclusales en el lado de no trabajo, sin embargo, evidenciando cierta relación entre la presencia de interferencias oclusales con género, presente con mayor prevalencia en el género masculino que en femenino

On the Effects of UV Photons/X-Rays on the Chemistry of the Sgr B2 Cloud

The lines of HOC, HCO, and CO are considered good tracers of photon-dominated regions (PDRs) and X-ray-dominated regions. We study these tracers toward regions of the Sgr B2 cloud selected to be affected by different heating mechanisms. We find the lowest values of the column density ratios of HCO versus HOC, HCO, and CO in dense H ii gas, where UV photons dominate the heating and chemistry of the gas. The HOC, HCO, and CO abundances and the above ratios are compared with those of chemical modeling, finding that high-temperature chemistry, a cosmic-ray ionization rate of 10 s, and timescales >10 yr explain well the HOC abundances in quiescent Sgr B2 regions, while shocks are also needed to explain the highest HCO abundances derived for these regions. The CO is mainly formed in PDRs, since the highest CO abundances of ∼(6-10) 10 are found in H ii regions with electron densities >540 cm and CO emission is undetected in quiescent gas. Among the ratios, the HCO/HCO ratio is sensitive to the electron density, as it shows different values in dense and diffuse H ii regions. We compare SiO J = 2-1 emission maps of Sgr B2 with X-ray maps from 2004 and 2012. One known spot shown on the 2012 X-ray map is likely associated with molecular gas at velocities of 15-25 km s. We also derive the X-ray ionization rate of ∼10 s for Sgr B2 regions pervaded by X-rays in 2004, which is quite low to affect the chemistry of the molecular gas.With funding from the Spanish government through the "María de Maeztu Unit of Excellence" accreditation (MDM-2017-0737

On the Effects of UV Photons/X-Rays on the Chemistry of the Sgr B2 Cloud

The lines of HOC+, HCO, and CO+ are considered good tracers of photon-dominated regions (PDRs) and X-ray-dominated regions. We study these tracers toward regions of the Sgr B2 cloud selected to be affected by different heating mechanisms. We find the lowest values of the column density ratios of HCO+ versus HOC+, HCO, and CO+ in dense H ii gas, where UV photons dominate the heating and chemistry of the gas. The HOC+, HCO, and CO+ abundances and the above ratios are compared with those of chemical modeling, finding that high-temperature chemistry, a cosmic-ray ionization rate of 10−16 s−1, and timescales >105.0 yr explain well the HOC+ abundances in quiescent Sgr B2 regions, while shocks are also needed to explain the highest HCO abundances derived for these regions. The CO+ is mainly formed in PDRs, since the highest CO+ abundances of ∼(6–10) × 10−10 are found in H ii regions with electron densities >540 cm−3 and CO+ emission is undetected in quiescent gas. Among the ratios, the HCO+/HCO ratio is sensitive to the electron density, as it shows different values in dense and diffuse H ii regions. We compare SiO J = 2–1 emission maps of Sgr B2 with X-ray maps from 2004 and 2012. One known spot shown on the 2012 X-ray map is likely associated with molecular gas at velocities of 15–25 km s−1. We also derive the X-ray ionization rate of ∼10−19 s−1 for Sgr B2 regions pervaded by X-rays in 2004, which is quite low to affect the chemistry of the molecular gas