Clock proteins like PER1 and PER2 are expressed in the brain, but little is known about their functionality outside the main suprachiasmatic clock. Here we show that PER1 and PER2 were neither uniformly present nor identically phased in forebrain structures of mice fed ad libitum. Altered expression of the clock gene Cry1 was observed in respective Per1 or Per2 mutants. In response to hypocalor...

In this paper, a linear series fed Yagi-like antenna array is introduced leading to an end-fire fan beam with low sidelobe level, SLL, high front to back ratio, F/B, and wide impedance bandwidth. The array can provide −29 dB SLL at centre frequency of 16.26 GHz, −20 dB SLL bandwidth of 7.5%, 23 dB F/B and 10.6% impedance bandwidth. Further improvement in SLL can be achieved by extending narrow ...

We demonstrate the design of optical phased arrays that emit 3D holograms. The design concept utilizes back propagation of desired image planes superimposed at the phased array. Improvements are shown utilizing random curved phase fronts. OCIS codes: (110.5100) Phase-array imaging systems; (090.2890) Holographic optical elements.

In a phased mission the relevant system configuration (block diagram or fault tree) changes during consecutive time periods (phases). Many systems are required to perform phased missions. A classic example is a space vehicle. A reliability analysis for a phased mission encounters complexities not present with just one phase, but can be transformed into an analysis of a synthetic single phase ca...

Bats use the spatial filtering performed by their pinnae in localization tasks. We propose a similar localization scheme based on the spatial filtering of the received echoes by using a phased array. By evolving the weights of a linear phased array using a genetic algorithm, a very efficient spatial filter can be implemented. The localization performance of the evolved array in combination with...

Ultrasonic phased arrays are a new technology that offers considerable potential for inspecting construction welds. Using electronic control of the beam, phased arrays can scan, sweep, steer and focus the ultrasound. Since welds typically produce defects of known character and orientation, phased arrays can be programmed to optimize weld inspections. These inspections include standard ASME-type...

In this work we shall review the (phased) inverse scattering problem and then pursue the phaseless reconstruction from far-field data with the help of the concept of scattering coefficients. We perform sensitivity, resolution and stability analysis of both phased and phaseless problems and compare the degree of ill-posedness of the phased and phaseless reconstructions. The phaseless reconstruct...

Abstract: The MIMO phased array radar is a theoretical concept for multi-sensor radar planning that combines elements of traditional phased-array radar with the developing technology of multiple-input multiple output (MIMO) radar. Space-time coding (STC) has been shown to play a key role in the design of Phased Array MIMO radar where MIMO radar can achieve improved localization performance by ...

Phased array UT techniques are being used for inspections in nuclear and conventional power plants for more than 10 years. Applications involving simple linear arrays, using either sectorial scanning or multiple-angle raster scanning, are now commonly used and accepted. But the power generation industry is continuously looking for inspection solutions to more challenging inspection configuratio...