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Revisiting the 3α reaction rates in helium burning stars
Published 2025-01-01“…Helium burning is one of the most fundamental steps of stellar nucleosynthesis, as it describes the formation of life-determining element of carbon, while it plays a key role in the evolution of Red Giant, accreting White Dwarfs and Neutron Stars. In this work we develop a generalized statistical theory for the 3α reaction, which is based on the use of the Imaginary Time Method, along with the semi-classical Hybrid α-Clustering (HαC) and Neck Model (NM) frameworks. …”
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Design of Optical Lens Assembly Method Based on Star Point Bonding and Surface Shape Accuracy
Published 2025-01-01“…The study adopts the three-point support principle to bond optical lenses, thereby optimizing the assembly process of optical lens components. …”
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Tidally Distorted Stars Are Triaxial Pulsators
Published 2025-01-01“…For tidally coupled dipole pressure modes, the tidal coupling dominates over the Coriolis force and the resulting pulsations are “triaxial,” with each of the three modes in a multiplet “tidally tilted,” to be aligned with one of the three principal axes of the star. …”
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Fixation Probabilities on Complete Star and Bipartite Digraphs
Published 2012-01-01Get full text
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Different Magnetic Field Distributions in Deformed Neutron Stars
Published 2019-04-01“…In this work, we review the formalism which would allow us to model magnetically deformed neutron stars. We study the effect of different magnetic field configurations on the equation of state (EoS) and the structure of such stars. …”
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A New Approach to Identifying Red Supergiant Stars in Metal-poor Galaxies: A Case Study of NGC 6822
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Joint beamforming optimization algorithm for secure cognitive radio based on STARS
Published 2024-03-01“…Secure cognitive radio (SCR) system based on reconfigurable intelligent surface (RIS) assumes that secondary user (SU) and primary user (PU) locate on the same side of the base station (BS), which can only cover part of the communication area and limits the deployment flexibility and effectiveness of the RIS.In order to solve the above problem, a new SCR system based on simultaneously transmitting and reflecting surface (STARS) was proposed.In the system, STARS could achieve full coverage of communication area, improve the received signal strength of the SU with the transmission beamforming vector and reduce the interference of the SU to the PU with the reflection beamforming vector, which provided new optimization degree of freedom (DoF) for the design of the SCR system.Considering secrecy rate constraint of the SU, interference power constraint (IPC) of the PU and transmission/reflection parameters constraint of the STARS, BS active beamforming vector and STARS transmission/reflection beamforming vectors were jointly optimized to minimize the BS’s transmit power from the perspective of reducing the total power consumption of the system.The minimization problem is a variable coupling non-convex problem, which is difficult to tackle directly.An alternating optimization (AO) algorithm based on difference-of-convex relaxation (DCR) method and sequential rank-one constraint relaxation (SROCR) method was proposed to jointly design the BS active beamforming vector and STARS transmission/reflection beamforming vectors.Simulation results show that the proposed algorithm has good convergence performance and effectively reduces the interference of SU on PU.Compared with the traditional RIS, random phase, maximum-ratio transmission (MRT) and equal energy splitting (Equal ES) schemes, the BS transmitting power is reduced by 8.3%, 15.4%, 5.9% and 5.3%, respectively.…”
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Volcanic Ash Region Path Planning Based on Improved A-Star Algorithm
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A Dynamical Stability Study of Triple-Star Systems Using Physical and Geometrical Parameters
Published 2021-03-01“…The dynamical stability of 141 triple-star systems is investigated. These systems are selected from the updated catalog of multiple stars systems (i.e., the MSC catalog). …”
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Are Wolf-Rayet Stars Able to Pollute the Interstellar Medium of Galaxies? Results from Integral Field Spectroscopy
Published 2013-01-01“…In contrast, we found an overabundance of N/O in spatial scales of the order of hundreds of pc associated with or close to the positions of the WR stars in 4 out of the 6 galaxies. …”
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The Eclipsing Binaries via Artificial Intelligence. II. Need for Speed in PHOEBE Forward Models
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Global and Local Infall in the ASHES Sample (GLASHES). I. Pilot Study in G337.541
Published 2025-01-01“…We estimate infall velocities from intermediate and low-mass cores to be 0.28–1.45 km s ^−1 , and infall rates to be on the order of 10 ^−4 –10 ^−3 M _⊙ yr ^−1 , both are higher than those measured in low-mass star-forming regions by more than a factor of 5 and an order of magnitude, respectively. …”
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Extraction and Characterisation of African Star Apple (Chrysophyllum albidum) Seed Oil and the Adsorptive Properties of the Fruit Shell in Ghana
Published 2019-01-01“…The kinetics of the adsorption favoured a pseudo-first-order reaction pathway for CaCl2 with R2 of 0.941 while ZnCl2 and MgCl2 favoured a pseudo-second-order reaction pathway with R2 of 0.914 and 0.973, respectively.…”
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Protocol for a feasibility study evaluating a supported self-management intervention for stroke survivors with aphasia (StarStep study)
Published 2025-01-01“…Methods StarStep is a mixed-methods, non-randomised feasibility study. …”
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Analysis of the impact of the quality of service to the elderly on their loyalty through a Memorable experience and satisfaction among the elderly in 5-star hotels in Mashhad.
Published 2024-06-01“…The statistical population of the research is all seniors over 70 years of age who refer to 5-star hotels in Mashhad and have used that hotel at least 3 times, in uncertain volume. …”
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A Simplified Model for Investigating the Magnetic Field Morphology of a Massive Clump in an Infrared Dark Cloud
Published 2022-10-01“…To address this investigation, we examine three specific clumps - MM1, MM2, and MM3 - within G34. …”
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