uniform linear array (ula)-based tapped-delay line (tdl) structure has good performance metrics when the signal sources are located at the middle angles. it offers poor performance when the signal sources are close to the array endfire. in this paper, a new approach is proposed which offers higher performance and desired beamforming on tdl structure when the wideband uncorrelated radio sources ...

A new four elements compact antenna array is presented and discussed to achieve enhanced phase resolution without sacrificing the array output power. This structure inspired by the Ormia Ochracea’s coupled ears. The analogy between this insect acute directional hearing capabilities and the electrically compact antenna array is used to enhance the array sensitivity to direction of arrival estima...

Possible nonlinearity in the response of sedimentary layers to incident P waves is studied using the strong-motion data f rom a vertical array in Taiwan at the site where a significant nonlinear response to S waves had been found. Soil transfer functions are analyzed at different excitation levels with a maximum vertical acceleration at surface reaching 0 . 1 g, corresponding to the compression...

A passive sonar array designed for tracking diving sperm whales in three dimensions from a single small vessel is presented, and the advantages and limitations of operating this array from a 6 m boat are described. The system consists of four free floating buoys, each with a hydrophone, built-in recorder, and global positioning system receiver (GPS), and one vertical stereo hydrophone array dep...

We describe the construction and performance of a passive, real-time terahertz camera based on a modular, 64-element linear array of cryogenic hotspot microbolometers. A reflective conical scanner sweeps out a 2 m x 4 m (vertical x horizontal) field of view (FOV) at a standoff range of 8 m. The focal plane array is cooled to 4 K in a closed cycle refrigerator, and the signals are detected on fr...

We construct multi-center solutions for charged, dilatonic, non-extremal black holes in D = 4. When an infinite array of such non-extremal black holes are aligned periodically along an axis, the configuration becomes independent of this coordinate, which can therefore be used for Kaluza-Klein compactification. This generalises the vertical dimensional reduction procedure to include non-extremal...

Based on a case study of a Portuguese packaging firm, this paper examines how vertical integration of the supplier serves as a vehicle for the full outsourcing of the client firms' needs in a solution that reduces transaction costs, favors specialization, and permits small and medium-sized firms to develop competencies that may be exploited in a wide array of projects. Vertical integration by t...

It is shown that a practical multichannel electroglottograph can be implemented by using synchronization of the RF signal sources of the various channels to limit interchannel interference. A multichannel electroglottograph can be used to determine the extent to which a given trace is generated primarily by the degree of vocal fold contact and not by noise or artifactual voice-synchronous disto...

Using a moored source and horizontal/vertical line array combination, horizontal coherence properties of high signal to noise ratio (> or =20 dB) 100-1600 Hz signals have been measured. Internal waves in the area of the measurement created moving episodic sound-speed anomaly structures, influencing coherence length. Measured horizontal coherence scales for 100 Hz ranged from 5 to 20 acoustic wa...

In this work a Fresnel lens array for Passive InfraRed (PIR) motion sensors was designed, fabricated and tested. The resulting spatial filtering lens array presents the capability of distinguishing the presence of humans from small pets. Such array designed to operate in the visible range of the spectrum was manufactured on a Diamond-Like Carbon (DLC) thin film, using well-known microfabricatio...