Abstract Using the cross-matched data of Gaia EDR3 and Two Micron All Sky Survey Point Source Catalog, a sample RC stars with parallax accuracies better than 20% is identified used to reveal nearby spiral pattern traced by old stars. As shown in overdensity distribution stars, there an arc-like feature extending from l ∼ 90° ∼243°, which passes close Sun. This probably arm segment indicating ga...

We present ALMA observations of CO $J = 2-1$ and CS 5-4$ emission from the disk around TW~Hydrae. Both molecules trace a predominantly Keplerian velocity structure, although slowing rotation is detected at outer edge beyond ${\approx}~140$~au in emission. This was attributed to enhanced pressure support gas density taper near disk. Subtraction an azimuthally symmetric background structure revea...

In this study, a three-dimensional transient simulation model of liquid cooling thermal management system with flow distributors and spiral channel plates for pouch lithium-ion batteries has been developed. The play the role uniforming temperature distribution reducing maximum within each battery, while have function difference between in battery module. accuracy thermophysical properties heat ...

we state several conditions under which comultiplication and weak comultiplication modulesare cyclic and study strong comultiplication modules and comultiplication rings. in particular,we will show that every faithful weak comultiplication module having a maximal submoduleover a reduced ring with a finite indecomposable decomposition is cyclic. also we show that if m is an strong comultiplicati...

In the purpose of environmental conservation and energy saving, demands for high torque density drive motors at low speed are increasing, vernier utilizing magnetic gear effect attracting many attentions. this paper, optimal winding methods a stator module type motor is clarified by using finite element analysis several models with different schemes in same structure. The results show that when...

in this paper, we show that every element of a discrete module is a sum of two units if and only if its endomorphism ring has no factor ring isomorphic to $z_{2}$. we also characterize unit sum number equal to two for the endomorphism ring of quasi-discrete modules with finite exchange property.