Recently Titov et al [ApJ 693,(2009) and ApJ (2007)] have made use of a covariant model to investigate magnetic reconnection of astrophysical plasmas. Earlier R Ricca [Phys Rev A (1991)] has used another covariant formalism, to investigated vortex filaments and solitons. This formalism, called Ricci rotation coefficients (RRC), is applied here, to the Chui and Moffatt [PRSA (1995)] knotted magn...

In this work the main principles of radio resource sharing with UWB are stated. Specifically different possible network scenarios are considered and the relevant brought advantages are addressed in order to investigate and identify the most flexible network paradigm to exploit the advantages of UWB. Hence a model for the network architecture is proposed which is ad-ho oriented as well as able t...

We present V-band CCD photometry of 65 RR Lyr variables from the globular cluster M5. We have estimated the basic physical parameters for 16 RRc stars and 26 RRab stars using a Fourier decomposition of the light curves of the variables. The mean values of mass, luminosity, effective temperature and relative helium abundance for the RRc stars are measured to be M = 0.54 M ⊙ , log(L/L ⊙) = 1.69, ...

We discuss the largest and most homogeneous spectroscopic dataset of field RR Lyrae variables (RRLs) available to date. estimated abundances using both high-resolution low-resolution ({\Delta S} method) spectra for fundamental (RRab) first overtone (RRc) RRLs. The iron 7,941 RRLs were supplemented with similar literature estimates available, ending up 9,015 (6,150 RRab, 2,865 RRc). metallicity ...

This paper describes a deep reinforcement learning (DRL) approach that won Phase 1 of the Real Robot Challenge (RRC) 2021, and then extends this method to more difficult manipulation task. The RRC consisted using TriFinger robot manipulate cube along specified positional trajectory, but with no requirement for have any specific orientation. We used relatively simple reward function, combination...

  While the effect of changes of stimulus waveform (quasitrapezoidal and rectangular current pulses) on nerve activation is clear, but there is no evidence on the effect of quasitrapezoidal pulses on ionic currents of cellular membrane. In the present study, the effect of depolarizing quasi-trapezoidal current pulses, in comparison with that of depolarizing rectangular current pulses, on firing...

The Fourier phase parameter ¢31 has been determined for RRc stars in five globular clusters NGC 6171 !"I 5, M.3, M?3, an~ M15. The results. indicate that the RRc. s!ars in a.given cluster show a seq~ence of ¢3: In~reasIn~ wIth penod, and that the hIgher !he cluster metalhclty, the higher the sequence lies in a plot of ¢31 wIth penod. The ¢31 values for the stars In NGC 6171 and M5 presented her...

Current LTE networks are experiencing significant growth in the number of users worldwide. The use data services for online browsing, e-learning, meetings and initiatives such as smart cities means that subscribers stay connected long periods, thereby saturating a signalling resources. One resources is Radio Resource Connected (RRC) parameter, which allocated to eNodeBs with aim limiting simult...

The 3GPP long term evolution(LTE) not only offer high bandwidth for data transfer but also exhaust the User Equipment(UE)’s battery life quickly. In order to save the UE’s battery Life, discontinuous reception(DRX) is specified to reduce the UE’s power consumption, DRX allow the UE to turn off RF module when there is no data need to transfer. This work focus on analysis DRX mechanism with diffe...

This paper presents an elegant yet straightforward design procedure for a compact rat-race coupler (RRC) with extended harmonic suppression. The coupler’s conventional ?/4 transmission lines (TLs) are replaced by specialized TL that offers significant size reduction and elimination capabilities in the proposed approach. is verified through theoretical, circuit, electromagnetic (EM) analyses, sh...