We present an XMM-Newton observation of NGC 7469, including studies of the X-ray and UV variability, 0.2−10 keV spectral continuum, Fe Kα emission line and the first-ever high-resolution X-ray spectrum of the soft X-ray warm absorber. We compare the properties of this X-ray warm absorber with the UV warm absorber as seen in a FUSE observation one year previously. The 0.2−10 keV spectral continu...

In this paper, we simulated a double junction cell based on top CdS/Cu2ZnSnS4 cell, stacked bottom CdS/Cu2ZnSnSe4 cell. We started by studying the perfomance of solar copper zinc tin selenide Cu2ZnSnSe4 (CZTSe) absorber. Then, evaluated photovoltaic parameters tandem at optimized thickness sulfide Cu2ZnSnS4 (CZTS) absorber where and cells deliver same photocurrent density. achieved A maximum ef...

Various external-recycle configurations of multi-pass flat-plate solar air collectors were studied theoretically to examine the optimal thermal performance under same working dimension and operation conditions. An absorber plate insulation sheet implemented horizontally vertically, respectively, into an open rectangular conduit conduct a recycling four-pass operation, which device lengthens flo...

We study theoretically how the brightness of pumps, with fixed profiles, affects temporal mode structure squeezed states generated by parametric waveguided sources. find that modes these can be partially mismatched and thus distinguishable, which is undesirable when using as resources for quantum computing or heralded state generation. By studying common frequency filtering techniques used expe...

Active harmonic mode-locking is particularly attractive for communication systems which require a high bit-rate locked to an external clock. However, most such lasers are implemented in a ring geometry where pulses pass through the modulator in only one direction. A linear laser has several advantages such as the possibility of integration, the simple incorporation of a semiconductor saturable ...

We demonstrate wide-band ultrafast optical pulse generation at 1, 1.5, and 2 μm using a single-polymer composite saturable absorber based on double-wall carbon nanotubes (DWNTs). The freestanding optical quality polymer composite is prepared from nanotubes dispersed in water with poly(vinyl alcohol) as the host matrix. The composite is then integrated into ytterbium-, erbium-, and thulium-doped...

We demonstrate self-starting 6.5-fs pulses from a Kerr-lens mode-locked Ti:sapphire laser with 200-mW average output power at a pulse repetition rate of ~86 M Hz. This is to our knowledge the shortest pulse ever generated directly from a laser. For dispersion compensation we used a prism pair in combination with double-chirped mirrors, which balances the higher-order dispersion of the prism pai...

We propose to use double negative (DNG) metamaterial slabs to build effective super-absorbers and perfect nanodetectors for single divergent sources. We demonstrate by numerical simulations that an absorbing nanoparticle properly placed inside a DNG slab back-covered with a perfect electric conductor or perfect magnetic conductor mirror can absorb up to 100% radiation energy of a single dipole ...

this paper presents a reduce roll vibration of the full vehicle model with passive suspension systems using vibration absorber to change the dynamic system matrix stat’s eigenvalue. since using the controller system has been splurged and required to energy consuming, in this research the vehicle body roll vibration has been reduced and supplied vehicle stability using a vibration absorber for t...

The thermal performance of a single pass solar air heater with five fins attached was investigated experimentally. Longitudinal fins were used inferior the absorber plate to increase the heat exchange and render the flow fluid in the channel uniform. The effect of mass flow rate of air on the outlet temperature, the heat transfer in the thickness of the solar collector, and the thermal efficien...