A novel wavelength-selective photonic time-delay filter is proposed and demonstrated. The device consists of an optical phased-array waveguide grating in a recirculating feedback configuration. It can function as a true-time-delay generator for squint-free beam steering in optically controlled phased-array antennas and as an encoding-decoding filter for wavelength code-division multiple access.

In this paper, we reviewed RF MEMS research efforts in planar structures and phased arrays. For planar transceivers, we have demonstrated several RF MEMS devices in order to establish building blocks in integrated millimeterwave systems. For phased-array applications, we have demonstrated two architectures for beam forming and steering without solid-state phase shifters.

In this paper, we propose a phased drowsy instruction cache with on-demand wakeup prediction policy (called “phased on-demand policy”) to reduce the leakage and dynamic energy with less performance overhead. As in prior non-phased on-demand policy, an extra stage for wakeup is inserted before the fetch stage in pipeline. The drowsy cache lines are woken up in wakeup stage and the wakeup latency...

Welds have been inspected by radiography for years, but this technology has major drawbacks: low detection rates for critical planar defects (i.e. cracks and lack of fusion), subjective interpretation, no vertical sizing capability, significant safety hazards, licensing issues, plant closures, and generally slow inspection rates. For decades, the main alternative was manual ultrasonics, which i...

The temperature-phased anaerobic digestion (TPAD) process was used for the anaerobic digestion of the source separated biodegradable organic fraction of municipal solid waste (OFMSW). The TPAD process was used to co-digest OFMSW with primary wastewater solids (PS) at ratios of 20:80, 40:60, 60:40, and 80:20 O FM SW :PS. Th e OF MS W/P S feed mixtu re wa s slurrie d at co ncen trations up to 5.2...

Phased mission analysis is carried out to predict the reliability of systems which undergo a series of phases, each with differing requirements for success, with the mission objective being achieved only on the successful completion of all phases. Many systems from a range of industries experience such missions. The methods used for phased mission analysis are dependent upon the repairability o...

Awake monkey fMRI and diffusion MRI combined with conventional neuroscience techniques has the potential to study the structural and functional neural network. The majority of monkey fMRI and diffusion MRI experiments are performed with single coils which suffer from severe EPI distortions which limit resolution. By constructing phased array coils for monkey MRI studies, gains in SNR and anatom...

MESSENGER's high-data-rate downlink will use the first electronically scanned phased-array antenna for a deepspace telecommunication application. Measured results for the lightweight phased-array antenna and the highefficiency Solid State Power Amplifiers (SSPAs), developed by JHU/APL, are presented. Two functional amplifiers within the X-band SSPAs provide output power that is scalable from 11...

A novel method to generate optical beams using on-chip silicon nanophotonic antenna arrays with engineered phase and amplitude is demonstrated. An 8×8 nanophotonic phased array to generate and manipulate Gaussian beams is shown. ©2013 Optical Society of America OCIS codes: (130.3120) Integrated Optics Devices; (280.5110) Phased-array Radar

INTRODUCTION: The transmit SENSE technique can reduce imaging time by shortening the trajectory in k-space which a multi-dimensional RF pulse follows for spatial selective excitation [1, 2]. The use of multiple transmit coils, each with its own time-dependent waveform and spatial sensitivity compensate for the missing parts of the excitation k-space. To implement Transmit SENSE, independent tra...