A very efficient RCS data compression and reconstruction technique, volume 4

A very efficient compression and reconstruction scheme for RCS measurement data was developed. The compression is done by isolating the scattering mechanisms on the target and recording their individual responses in the frequency and azimuth scans, respectively. The reconstruction, which is an inverse process of the compression, is granted by the sampling theorem. Two sets of data, the corner reflectors and the F-117 fighter model, were processed and the results were shown to be convincing. The compression ratio can be as large as several hundred, depending on the target's geometry and scattering characteristics

Valuation of travel time reliability in passenger transport

Rietveld, P. [Promotor]Verhoef, E.T. [Promotor

High Input Impedance Voltage-Mode Universal Biquadratic Filters With Three Inputs Using Three CCs and Grounding Capacitors

Two current conveyors (CCs) based high input impedance voltage-mode universal biquadratic filters each with three input terminals and one output terminal are presented. The first circuit is composed of three differential voltage current conveyors (DVCCs), two grounded capacitors and four resistors. The second circuit is composed of two DVCCs, one differential difference current conveyor (DDCC), two grounded capacitors and four grounded resistors. The proposed circuits can realize all the standard filter functions, namely, lowpass, bandpass, highpass, notch and allpass filters by the selections of different input voltage terminals. The proposed circuits offer the features of high input impedance, using only grounded capacitors and low active and passive sensitivities. Moreover, the x ports of the DVCCs (or DDCC) in the proposed circuits are connected directly to resistors. This design offers the feature of a direct incorporation of the parasitic resistance at the x terminal of the DVCC (DDCC), Rx, as a part of the main resistance

Study of the Brazil and Falkland currents using their images of Nimbus 5 and oceanographic data in 1972 - 1973

The Western Edge of the Sub-tropical Convergence of the South-western Atlantic Ocean, called the Front, which is a thermal discontinuity between the Brazil and Falkland Currents, was studied utilizing the Temperature Humidity Infrared Radiometer (THIR) of Nimbus V in the 10.5 to 12.5 micrometers channel and historical oceanographic data. Some important results obtained are: the oceanographic Front could be detected from Nimbus THIR data; oceanographic charts showed that the transition zone where the Brazil and the Falkland Currents meet was the Front detected from satellite data; ocean current speeds calculated with THIR data were of the same order of magnitude as those calculated oceanographically; fisheries statistics for Pargo Roseo showed that the maximum catches were in September of 1973, in the period when the Front was observed most distinctly and clearly. The results showed the great potentiality of satellite data to study surface thermal structures, surface currents and oceanic fisheries

Constructing a measure of industry-specific human capital using Tobin's Q theory

In this paper, we develop a measure of industry specific human capital using the Tobin's qtheory. The measure is derived from a structural model of heterogeneous knowledge labor,which is homogeneous physical labor embodied with industry specific human capital

Predictions of Vertically Vibrating Foundation Response With Modified Radiation Damping

A simple solution technique for evaluating the response of a surface or embedded foundation under vertical vibrations in a homogeneous soil has been developed. The effects of soil nonlinearity on shear modulus and material damping, frequency on stiffness and radiation damping, and embedment of foundation on stiffness and radiation damping have been considered. A computer program has been developed based on the Elastic Half Space (EHS) analog technique (Lysmer and Richart, 1966), to compute the response amplitude of both surface and embedded footings. The computed response has been verified by comparing it with measured data from Novak (1970). The predicted response is underestimated in all cases because the (EHS) analog computed radiation damping is overestimated. A modification factor, λ, has been proposed and applied to correct the estimated radiation damping. A unique relationship between λ, (correction factor for radiation damping), and shear strain (γ) has been established for field use. A rational correction factor to radiation damping for computing vibration footing response has been proposed for the first time and this has been shown to provide computed results which compare quite well to measured results

Association of Cannabis Use during Adolescence, Prefrontal CB1 Receptor Signaling, and Schizophrenia

The cannabinoid receptor 1 (CB1R) is the G-protein coupled receptor responsible for the majority of the endocannabinoid signaling in the human brain. It is widely distributed in the limbic system, basal ganglia, and cerebellum, which are areas responsible for cognition, memory, and motor control. Because of this widespread distribution, it is not surprising that drugs that activate CB1R have expected behavioral outcomes consistent with dysregulated signaling from these areas (e.g., memory loss, cognitive deficits, etc). In the context of this review, we present evidence for the role of CB1R signaling in the prefrontal cortex (PFC), an area involved in executive functions, with emphasis on the developmental regulation of CB1R signaling in the acquisition of mature PFC function. We further hypothesize how alterations in CB1R signaling specifically during adolescent maturation might confer liability to psychiatric disorders

Journeys Home: Tracking the most vulnerable

In 2010 the Australian Government commissioned The Melbourne Institute of Applied Economic and Social Research at the University of Melbourne to undertake "Journeys Home (JH): A Longitudinal Study of the Factors Affecting Housing Stability". The broad aim of JH was to improve the understanding of, and policy responses to, the diverse social, economic and personal factors related to homelessness and the risk of becoming homeless. Importantly, JH is one of the first longitudinal studies of homeless people that both draws it sample from a wide population and includes people who are vulnerable to homelessness. This paper provides a brief summary of the JH survey, discussing its aims, survey design, data collection process, and response outcomes over its six waves of data collection. It also highlights some of the initial research that has been published utilising the data since its release