Objetivo: Evaluar los indicadores físicos de la calidad suelos sometidos a cuatro usos distintos en Lixisols Objective: To evaluate the physical indicators of quality soils subjected to four different land uses in from La Sabana Huimanguillo, Tabasco, Mexico. Design/methodology/approach: Nine variables were evaluated soil samples located Sabana, Huimanguillo: infiltration rate, resistance penet...

We use a numerical Galactic chemical evolution model and find that the common envelope jets supernova (CEJSN) r-process scenario can account for both very early average ratio of europium to iron its at later times in Milky-Way (MW) Galaxy. In CEJSN neutron star (NS) spirals-in inside red supergiant (RSG) all way core destroys it. According this isotopes are nucleosynthesized neutron-rich accret...

In this paper, we introduce a new stochastic approximation (SA) type algorithm, namely the randomized stochastic gradient (RSG) method, for solving an important class of nonlinear (possibly nonconvex) stochastic programming (SP) problems. We establish the complexity of this method for computing an approximate stationary point of a nonlinear programming problem. We also show that this method pos...

WOH G64 is an unusual red supergiant (RSG) in the Large Magellanic Cloud (LMC), with a number of properties that set it apart from the rest of the LMC RSG population, including a thick circumstellar dust torus, an unusually late spectral type, maser activity, and nebular emission lines. Its reported physical properties are also extreme, including the largest radius for any star known and an eff...

Abstract I propose a new scenario, the polar common envelope jets supernova (CEJSN) impostor to account for AT2018cow-like fast blue optical transients (FBOTs). The CEJSN scenario evolves through four main phases. (1) A red supergiant (RSG) star expands tidally interact with neutron (NS) companion (or black hole). interaction increases RSG mass loss rate form circumstellar matter (CSM) halo r ≃...

Abstract Quiescent mass loss during the red supergiant (RSG) phase has been shown to be far lower than prescriptions typically employed in single-star evolutionary models. Importantly, RSG winds are too weak drive production of Wolf-Rayet (WR) stars and stripped-envelope supernovae (SE-SNe) at initial masses roughly 20–40 M ? . If single make WR SE-SNe, this shifts burden rare dust-enshrouded R...

Lutesium-177 (l77Lu) merupakan salah satu radioisotop yang efektif untuk terapi kanker prostat. Radioisotop 177Lu diproduksi dengan cara mengiradiasi target Lu2O3 di teras reaktor RSG-GAS. Untuk keperluan pengendalian keselamatan iradiasi RSG-GAS, pada perlu dilakukan beberapa perhitungan, satunya adalah perhitungan perpindahan panas ke pendingin primer kolam reaktor. Panas gamma terbangkitkan ...