the paper presents the results of an investigation on the acoustic performance of vertical profile parallel barriers with quadratic residue diffuser tops and faces. a 2d boundary element method (bem) was used to predict the barrier insertion loss. the results of rigid and with absorptive coverage were also calculated for comparisons. using qrd on the top surface and faces of all vertical profil...

Laser-induced electron tunnelling—which triggers a broad range of ultrafast phenomena such as the generation attosecond light pulses, photoelectron diffraction and holography—has laid foundation for strong-field physics science. Using attoclock constructed by single-colour elliptically polarized laser fields, previous experiments have measured tunnelling rates, exit positions, velocities delay ...

We evaluate the terahertz (THz) detectors based on field-effect transistor (FET) with graphene channel (GC) and a floating metal gate (MG) separated from GC by black-phosphorus (b-P) or black-arsenic (b-As) barrier layer. The operation of these GC-FETs is associated heating two-dimensional electron gas in impinging THz radiation leading to thermionic emission hot electrons MG. This results vari...

A detector for the case of a radar target with known Doppler and unknown complex amplitude in complex Gaussian noise with unknown parameters has been derived. The detector assumes that the noise is an Auto-Regressive (AR) process with Gaussian autocorrelation function which is a suitable model for ground clutter in most scenarios involving airborne radars. The detector estimates the unknown...

Introduction “Blink” is defined as closing and opening of the eyes in a small duration of time. In this study, we aimed to introduce a fast, robust, vision-based approach for blink detection. Materials and Methods This approach consists of two steps. In the first step, the subject’s face is localized every second and with the first blink, the system detects the eye’s location and creates an ope...

objective: in this article, a numerical study is conducted on mixing of two fluids in the liquid phase with two different concentrations of a chemical species in the electro-osmotic flow. methods: the base liquid is an electrolyte which flows in a two-dimensional micro-channel having electrically charged walls. lorentz electric force, which is used as stimulating flow factor, is created by appl...

background: hyperthyroidism as a risk factor for stroke is not conclusive. there are no definite data on the relationship between ischemic cerebrovascular injury and hyperthyroidism. this study was designed to define whether the outcomes of post-ischemic stroke injury are influenced by chronic hyperthyroidism. methods: two groups of hyperthyroid (ht) and control euthyroid rats of equal numbers ...

The GeSe and SnSe have great potential in nuclear detector devices. Under irradiation, the formation migration of point defects may affect their properties performance significantly. In this study, a comparative study vacancy has been carried out by first-principles method. It is shown that both compounds cation vacancies are generally much easier to form than anion vacancies, migrate vacancies...

A new photoelectric phenomenon, the in-plane (IPPE) effect, has been recently discovered at terahertz (THz) frequencies in a $\mathrm{Ga}\mathrm{As}/{\mathrm{Al}}_{x}{\mathrm{Ga}}_{1\ensuremath{-}x}\mathrm{As}$ heterostructure with two-dimensional (2D) electron gas [W. Michailow et al., Sci. Adv. 8, eabi8398 (2022)]. In contrast to conventional PE phenomena, IPPE effect is observed normal incid...

We analyze the two-dimensional electron gas (2DEG) heating by incident terahertz (THz) radiation in field-effect transistor (FET) structures with graphene channels (GCs) and black-phosphorus black-arsenic gate barrier layers (BLs). Such GC-FETs can operate as bolometric THz detectors using thermionic emission of hot electrons from GC via BL into gate. Due to excitation plasmonic oscillations si...