We present the results of a uniform analysis of the soft X-ray spectra of fifteen type I AGN observed with the high resolution X-ray gratings on board Chandra. We found that ten of the fifteen AGN exhibit signatures of an intrinsic ionized absorber. The absorbers are photoionized and outflowing, with velocities in the range ∼ 10−10 km s. The column density of the warm absorbing gas is ∼ 10cm. N...

A perforated plate with stepwise apertures (PPSA) is proposed to improve sound absorption for low frequencies. In contrast an ordinary insufficient acoustic resistance and small mass, the stepped holes could match of air characteristic impedance also moderately increase mass especially at Prototypes made by 3D printing technology are tested in tube. The measured results agree well that predicti...

Voltage, temperature, and intensity dependence of saturable absorption in InGaAs/InP multiple quantum wells are investigated and related to the lasing characteristics of intracavity loss modulated InGaAs/InP quantum well lasers. Bistability in the static laser light output/absorber voltage characteristic arises from the shape of the measured absorption/ voltage/intensity surface of the quantum ...

The purpose of this research is to observe and understand the processes by which gamma rays are attenuated in passing through absorber, effects shielding geometry. Gamma ray linear attenuation coefficient, mass mean free path, half value layer buildup factor were evaluated for different absorbers, using 60Co source with energy 1.332 MeV. coefficient absorber such as aluminium was (0.1485 cm-1),...

Ultrafast demagnetization of ferromagnetic metals can be achieved by a heat pulse propagating in the electron gas of a non-magnetic metal layer, which absorbs a pump laser pulse. Demagnetization by electronic heating is investigated on samples with different thicknesses of the absorber layer on nickel. This allows us to separate the contribution of thermalized hot electrons compared to non-ther...

Here we realize a broadband absorber by using a hyperbolic metamaterial composed of alternating aluminum-alumina thin films based on superposition of multiple slow-wave modes. Our super absorber ensures broadband and polarization-insensitive light absorption over almost the entire solar spectrum, near-infrared and short-wavelength infrared regime (500–2500 nm) with a simulated absorption of ove...

We demonstrate a low-cost uncooled terahertz (THz) imager fabricated in a standard 180 nm CMOS process. The imager is composed of a broadband THz metamaterial absorber coupled with a diode microbolometer sensor where the pn junction is used as a temperature sensitive device. The metamaterial absorber array is integrated in the top metallic layers of a six metal layer process allowing for comple...

The interaction of an optical pulse with a quantum well saturable absorber is simulated using a semi-classical two-level-atom model which has been modified to approximate spectral hole burning in the carrier distribution. Saturable absorption behaviour is examined in the limit where pulse duration approaches the carrier-carrier scattering time. For long pulses bleaching dominates the absorber r...

co2 emissions from combustion flue gases have turned into a major factor in global warming. post-combustion carbon capture (pcc) from industrial utility flue gases by reactive absorption can substantially reduce the emissions of the greenhouse gas co2. to test a new solvent (ait600) for this purpose, a small pilot plant was used. this paper presents the results of studies on chemical methods of...

We report a deep search for HI 21cm emission from the z = 0.00632 sub-DLA toward PG1216+069 with the Giant Metrewave Radio Telescope. No emission was detected and our 5σ upper limit on the mass of any associated galaxy is MHI . 107 M⊙, nearly 3 orders of magnitude less than M⋆HI. The z ∼ 0.006 absorber is thus the most extreme known deviation from the standard paradigm in which high column dens...