How does the high selectivity to stimulus orientation emerge in the visual cortex? Thalamic feedforward-dominated models of orientation selectivity predict constant selectivity during the visual response, whereas intracortical recurrent models predict dynamic improvement in selectivity. We imaged the cat visual cortex with voltage-sensitive dyes to measure orientation-tuning dynamics of a large...

Fundamental asymmetric lamb wave’s interactions with rectangular notches in a steel plate are investigated in this paper. Elastodynamic finite integration technique previously mainly used to study wave propagation in elastic media is adopted to study lamb wave interaction with defects. Simulation examples are presented to illustrate the reflection and transmission coefficients’ variations with ...

A high-speed photonic temporal differentiator based on cascaded SOI microring resonators is proposed and experimentally demonstrated in this study. The first-order all-optical differentiation functionality is realized through approaching the critical coupling condition of the cascaded microring resonators. A three-stage double channel side-coupled cascaded microring structure is used to provide...

This paper deals with response signals processing in eddy current non-destructive testing. Non-sinusoidal excitation is utilized to drive eddy currents in a conductive specimen. The response signals due to a notch with variable depth are calculated by numerical means. The signals are processed in order to evaluate the depth of the notch. Wavelet transformation is used for this purpose. Obtained...

periodic noises are unwished and spurious signals that create repetitive pattern on images and decreased the visual quality. firstly, this paper investigates various methods for reducing the effects of the periodic noise in digital images. then an adaptive optimum notch filter is proposed. in the proposed method, the regions of noise frequencies are determined by analyzing the spectral of noisy...

Studies have shown the utility of uterine artery (UtA) doppler in prediction placental disorders pregnancy, mainly hypertensive pregnancy (HDP) and fetal growth restriction. The most studied parameters are pulsatility index (PI), resistance (RI), or presence a diastolic notch (DN). While PI RI quantitative measures, attempts to quantify DN for HDP limited. We aimed an attempt improve disorders....

OBJECTIVE To test the validity of the subzygomatic fossa as a possible landmark in identifying the origin of the zygomaticus major muscle (ZMM). METHODS Twenty-three fresh cadaver facial halves were dissected. Four references points were identified in each cadaver head: the zygomatic arch, the malar eminence, the modiolus, and the ZMM insertion notch. The ZMM insertion notch is a palpable lan...

Fractures of the distal radius are among the most common injuries of the upper extremity, though treatment has traditionally focused on restoration of the radiocarpal joint and late sequelae may persist. X-ray imaging underestimates sigmoid notch involvement following distal radius fractures. No classification system exists for disruption patterns of the sigmoid notch of the radius associated w...

Abstract The paper investigates the modelling and optimization of notch-repaired/friction stir stitched AISI 201 stainless steel welds via use a non-consumable tool-based repair process. process employs sequential hopping-stitching approach. This approach involves application two intercepted completely overlapped plunging actions probe-less titanium carbide tool to create an effective refilling...