ABSTRACT We report on observations of PSR B1508 + 55’s scintillation at the Effelsberg 100-m telescope spanning from early 2020 to 2022. In autumn 2020, close time pulsar was predicted cross echoes in its pulse profile, a sudden transition arcs peculiar stripe-like features parabolic arclets observed. To infer geometric model scattering, we measure effects annual velocity curve Earth, relative ...

We present an alternative Double Description representation for the domain of NNC (not necessarily topologically closed) polyhedra, together with the corresponding Chernikova-like conversion procedure. The representation differs from the ones adopted in the currently available implementations of the Double Description method in that it uses no slack variable at all: this new approach provides a...

let  be a banach algebra. let  be linear mappings on . first we demonstrate a theorem concerning the continuity of double derivations; especially that all of -double derivations are continuous on semi-simple banach algebras, in certain case. afterwards we define a new vocabulary called “-higher double derivation” and present a relation between this subject and derivations and finally give some ...

Heteroscedasticity is often encountered in spatial-data analysis, so a new class of heterogeneous spatial autoregressive models introduced this paper, where the variance parameters are allowed to depend on some explanatory variables. Here, we interested problem parameter estimation and variable selection for both mean models. Then, unified procedure via double-penalized quasi-maximum likelihood...