V697 Sco, the remnant of Nova Scorpii 1941 and currently at V ∼ 20.0, is found from photometric observations to have the characteristics of an intermediate polar (IP) with an orbital period (Porb) of 4.49 h and a rotation period (Prot) of 3.31 h. It therefore appears to be a member of the rare class of IPs where Prot ∼ Porb, which are probably discless systems. The prominence of the modulation ...

We present preliminary results of a simultaneous X-ray/optical campaign of the prototypical LMXB Sco X-1 at 1-10 Hz time resolution. Lightcurves of the high excitation Bowen/HeII emission lines were obtained through narrow interference filters with ULTRACAM, and these were cross-correlated with X-ray lightcurves. We find evidence for correlated variability, in particular when Sco X-1 enters the...

The article discusses the initial role of Shanghai Cooperation Organization (SCO) in Central Asia and latest development trends, as well possible scenarios for its transformation future, with a special focus on Asia. enlargement SCO 2017 enhanced geopolitical weight expanded opportunities further multilateral cooperation. It has chance to transform into Eurasian organisation. Nevertheless, thes...

This paper will review a new technique of detecting companion stars in LMXBs and X-ray transients in outburst using the Bowen fluorescence lines at λλ4634-4640. These lines are very efficiently reprocessed in the atmospheres of the companion stars, and thereby provide estimates of the K2 velocities and mass functions. The method has been applied to Sco X-1, X1822-371 and GX339-4 which, in the l...

We present high resolution time-resolved optical spectra of the high inclination short orbital period dwarf nova V893 Sco. We performed spectral analysis through radial velocity measurements, Doppler mapping, and ratioed Doppler maps. Our results indicate that V893 Sco's accretion disk is dissimilar to WZ Sge's accretion disk, and does not fit any of the current accretion disk models. We derive...

In distributed applications, a group of application processes is established and the processes in the group communicate with each other. i.e. intra-group communication. Here, messages have to be atomically delivered to all the destinations and be causally ordered. In addition, the processes send messages to any subset of the group at any time. This paper presents an intra-group communication pr...

This paper presents two different code acquisition schemes for sectorized multi-antenna CDMA systems in downlink mode. The so called ”separated code optimization” (SCO) decomposes a two dimensional spreading code into its time and space component and treats each part separately. The SCO maximizes the signal to interference and noise ratio at each receiver. In contrast, the ”joint code optimizat...

The synthesis of transition metal oxides is typically time- and energy-consuming. Recently, fast sintering methods have demonstrated great potential in reducing ceramic time energy use, improving the commercial prospects these materials. In this article, a quenched ultrafast high-temperature (qUHS) technique developed to sinter metastable brownmillerite SrCoO2.5 (SCO) less than minute. Surprisi...

A novel spectrally efficient modified asymmetrically and symmetrically clipped optical (mASCO)-OFDM for intensity modulated direct detection (IM/DD) systems is presented. The conventional ASCO-OFDM use two frames to transmit the (ACO)-OFDM (SCO)-OFDM system. proposed mASCO-OFDM system replaces frame SCO-OFDM by a single SCO (mSCO)-OFDM. mSCO-OFDM clips data on only one side of symmetry performs...