Single frequency multitransmitter telemetry

The invention relates to a single frequency multitransmitter telemetry system that will deliver a substantial amount of data at low cost. The invention consists essentially of a plurality of sensor transmitter units at different locations, with individual signal conditioning and logic, which send sampled data signals to a single receiver. The transmitters operate independently on the same frequency in a frequency shift keying modulation system and are not synchronized to the receiver. The problem of reception of data from more than one transmitter simultaneously is solved by discarding the data - when there is overlap of data from two or more transmitters, the data is discarded and when there is no overlap the data is retained. The invention utilizes a unique overlap detection technique to determine if data should be retained or discarded. When data is received from a transmitter, it goes into a shift register

Travel choices in Scotland - the effect of local accessibility on non-work travel

Accessibility features prominently in the developing transport policies of both the United Kingdom Government and the devolved Scottish Executive which aim to promote social inclusion in particular and the integration of transport and land use planning more generally. It follows that a detailed understanding of the relationship between accessibility, personal mobility and travel behaviour is critical to the successful implementation of these policies. This paper presents the results of a disaggregate, multi-variate analysis of the Scottish Household Survey (SHS) dataset and attempts to unravel the complex relationship between socio-economical circumstance, geographical access to local services and public transport and revealed non-work travel choices. The socio-economical and geographical diversity of Scotland offers an excellent opportunity to undertake an analysis of this nature. The SHS is a continuous, cross-sectional survey funded by the Scottish Executive and undertaken by face-to-face interview based on a sample of the general population in private residences in Scotland. It seeks to provide information on the composition, characteristics and behaviour of Scottish households. The survey collects information in two parts - firstly the highest income householder provides household level data including household composition and income, key attributes of household members, transport resources available to the household including access to public transport; secondly a randomly selected adult from the household provides information on inter alia personal travel (including the completion of a one-day travel diary on the previous day) and personal views on transport, the neighbourhood and local services. The dataset analysed in this paper was collected between 1999 and 2003 and contains over 75,000 surveyed households and over 49,000 completed travel diaries. Two other variables were matched with the residential location of SHS respondents and added to the dataset; namely, an index representing proximity to local services at electoral ward level derived in the Scottish Indices of Deprivation 2003 study and a locational classification for each respondent which captures settlement size and wider regional accessibility. The primary focus of the analysis presented in this paper is an examination of the extent to which the quality of local access to services affects distance travelled for non-work purposes. Within this analysis individual and household socio-economical circumstance, available transport resources (both car ownership and local access to public transport) and the wider regional geographical context are also taken into account. It is hypothesised that good local access is negatively associated with distance travelled and that there also exists the possibility of significant interaction between local access and socio-economical circumstance and available transport resources. Regression models are developed for non-work travel which test the statistical significance of these explanatory variables. The results of the analysis reported here will add to the existing evidence base on the relationship between accessibility and travel choice. Its conclusions are expected to inform the development of strategies to enhance social inclusion and reduce overall travel which are tailored to socio-economical and geographical circumstance

The Implications of Employee Turnover on Credit Unions

A lack of managerial responses to employee needs contributes to an increased rate of employee turnover in credit unions. Some managers do not possess the skills and strategies necessary to reduce employee turnover. This case study explored what strategies managers used to successfully reduce employee turnover. The population for this study was managers of a financial institution in Northeast Kansas with at least 1 year of leadership experience using methods to reduce employee turnover. Theory X and theory Y theory was the conceptual framework for this study. Data collection included semistructured face-to-face interviews with 10 managers and an exploration of company archival documents. Using Yin\u27s 5-step data analysis method, 3 major themes emerged: the ideal work environment; communication with employees; and work relationship with supervisors, which included the importance of connecting with your employees. Recommendations for action included listening, properly communicating, problem solving, and maintaining a stable work environment. Managers may apply these results to successfully reduce turnover in the organization. Social implications include providing a better understanding of employee retention and increasing knowledge of what influences employee turnover

Analog-digital simulation of transient-induced logic errors and upset susceptibility of an advanced control system

A simulation study is described which predicts the susceptibility of an advanced control system to electrical transients resulting in logic errors, latched errors, error propagation, and digital upset. The system is based on a custom-designed microprocessor and it incorporates fault-tolerant techniques. The system under test and the method to perform the transient injection experiment are described. Results for 2100 transient injections are analyzed and classified according to charge level, type of error, and location of injection

Contributions to GNSS-R earth remote sensing from nano-satellites

Premi extraordinari doctorat UPC curs 2015-2016, àmbit de CiènciesGlobal Navigation Satellite Systems Reflectometry (GNSS-R) is a multi-static radar using navigation signals as signals of opportunity. It provides wide-swath and improved spatio-temporal sampling over current space-borne missions. The lack of experimental datasets from space covering signals from multiple constellations (GPS, GLONASS, Galileo, Beidou) at dual-band (L1 and L2) and dual-polarization (Right Hand Left Hand Circular Polarization: RHCP and LHCP), over the ocean, land and cryosphere remains a bottleneck to further develop these techniques. 3Cat-2 is a 6 units (3 x 2 elementary blocks of 10 x 10 x 10 cm3) CubeSat mission ayming to explore fundamentals issues towards an improvement in the understanding of the bistatic scattering properties of different targets. Since geolocalization of specific reflections points is determined by the geometry only, a moderate pointing accuracy is still required to correct for the antena pattern in scatterometry measurements. 3Cat-2 launch is foreseen for the first quarter 2016 into a Sun-Synchronous orbit of 510 km height using a Long March II D rocket. This Ph.D. Thesis represents the main contributions to the development of the 3Cat-2 GNSS-R Earth observation mission (6U CubeSat) including a novel type of GNSS-R technique: the reconstructed one. The desing, development of the platform, and a number of ground-based, airborne and stratospheric balloon experiments to validate the technique and to optimize the instrument. In particular, the main contributions of this Ph.D. thesis are: 1) A novel dual-band Global Navigation Satellite Systems Reflectometer that uses the P(Y) and C/A signals scattered over the sea surface to perform highly precise altimetric measurements (PYCARO). 2) The first proof-of-concept of PYCARO was performed during two different ground-based field experiments over a dam and over the sea under different surface roughness conditions. 3) The scattering of GNSS signals over a water surface has been studied when the receiver is at low height, as for GNSS-R coastal altimetry applications. The precise determination of the local sea level and wave state from the coast can provide useful altimetry and wave information as "dry" tide and wave gauges. In order to test this concept an experiment has been conducted at the Canal d'Investigació i Experimentació Marítima (CIEM) wave channel for two synthetic "sea" states. 4) Two ESA-sponsored airborne experiments were perfomed to test the precision and the relative accuracy of the conventional GNSS-R. 5) The empirical results of a GNSS-R experiment on-board the ESA-sponsored BAXUS 17 stratospheric balloon campaign performed North of Sweden over boreal forests showed that the power of the reflected signals is nearly independent of the platform height for a high coherent integration time. 6) An improved version of the PYCARO payload was tested in Octover 2014 for the second time during the ESA-sposored BEXUS-19,. This work achieved the first ever dual-frequency, multi-constellation GNSS-R observations over boreal forests and lakes using GPS, GLONASS and Galileo signals. 7) The first-ever dual-frequency multi-constellation GNSS-R dual-polarization measurements over boreal forests and lakes were obtained from the stratosphere during the BEXUS 19 using the PYCARO reflectometer operated in closed-loop mode.Global Navigation Satellite Systems Reflectometry (GNSS-R) es una técnica de radar multi-estático que usa señales de radio-navegación como señales de oportunidad. Esta técnica proporciona "wide-swath" y un mejor sampleado espacio-temporal en comparación con las misiones espaciales actuales. La falta de datos desde el espacio proporcionando señales de múltiples constelaciones (GPS, GLONASS, Galileo, Beidou) en doble banda (L1 y L2) y en doble polarización (RHCP y LHCP) sobre océano, tierra y criosfera continua siendo un problema por solucionar. 3Cat-2 es un cubesat de 6 unidades con el objetivo de explorar elementos fundamentales para mejorar el conocimiento sobre el scattering bi-estático sobre diferentes medios dispersores. Dado que la geolocalización de puntos de reflexión específicos está determinada solo por geometría, es necesario un requisito moderado de apuntamiento para corregir el diagrama de antena en aplicaciones de dispersometría. El lanzamiento del 3Cat-2 será en Q2 2016 en una órbitra heliosíncrona usando un cohete Long March II D. Esta tesis representa las contribuciones principales al desarrollo del satélite 3Cat2 para realizar observación de la tierra con GNSS-R incluyendo una nueva técnica: "the reconstructed-code GNSS-R". El diseño, desarrollo de la plataforma y un número de experimentos en tierra, desde avión y desde globo estratosférico para validar la técnica y optimizar el instrumento han sido realizados. En particular, las contribuciones de esta Ph.D. son: 1) un novedoso Global Navigation Satellite Systems Reflectometer que usa las señales P(Y) y C/A después de ser dispersadas sobre la superficie del mar para realizar medidas altimétricas muy precisas. (PYCARO). 2) La primera prueba de concepto de PYCARO se hizo en dos experimentos sobre un pantano y sobre el mar bajo diferentes condiciones de rugosidad. 3) La disperión de las señales GNSS sobre una superfice de agua ha sido estudiada para bajas altitudes para aplicaciones GNSS-R altimétricas de costa. La determinación precisa del nivel local del mar y el estado de las olas desde la costa puede proporcionar información útil de altimetría e información de olas. Para hacer un test de este concepto un experimento en el Canal d'Investigació i Experimentació Marítima (CIEM) fue realizado para dos estados sintéticos de rugosidad. 4) Dos experimentos en avión con esponsor de la ESA se realizaron para estudiar la preción y la exactitud relativa de cGNSS-R. 5) Los resultados empíricos del experimento GNSS-R en BEXUS 17 con esponsor de la ESA realizado en el norte de Suecia sobre bosques boreales mostró que la potencia reflejada de las señales es independiente de la altitud de la plataforma para un tiempo de integración coherente muy alto. 6) Una versión mejorada del PYCARO fue testeada en octubre del 2014 por segunda vez durante el BEXUS 19 que también fue patrocidado por la ESA. Este trabajo proporcionó las primeras medidas GNSS-R sobre bosques boreales en doble frecuencia usando varias constelaciones GNSS. 7) Las primeras medidas polarimétricas (RHCP y LHCP) de GNSS-R sobre bosques boreales también fueron conseguidas durante el experimento BEXUS 19.Award-winningPostprint (published version

Numerical Simulation and Aerodynamic Design of Small-Scale Rotary-Wing for Unmanned Aerial Systems in Terrestrial and Martian Applications

L'abstract è presente nell'allegato / the abstract is in the attachmen

FILM-INDUCED EMOTIONAL EXPERIENCE AND EXPRESSION IN SOCIAL ANHEDONIA

Social anhedonia is an important feature of schizophrenia and it is a promising indicator of latent liability for the disorder. Although social anhedonia is defined as an affective construct, only a limited number of studies have investigated the affective and behavioral correlates of the construct. Studies that have looked at these variables have been limited by a lack of appropriate measures of affiliation, control for contributions of current depressive symptoms and inclusion of both male and female participants. The current study sought to extend past research by addressing the limitations listed above. A cohort of psychometrically identified social anhedonics and normally hedonic controls were identified from a large college sample. The participants completed a clinical interview and a series of questionnaires. The clinical interviews focused on current and past mood disorders, schizophrenia and schizophrenia spectrum personality disorders. The questionnaires focused on self-reports of current depressive symptoms and general tendencies to express emotion. The participants were then presented with a series of affect eliciting films clip during which their emotional expressions were recorded. After each film, they were asked to self report their affective state. Contrary to past studies and current hypothesizes social anhedonics did not differ from controls in terms of emotional experience or emotional expression. The lack of findings could be as a result of small sample sizes, lack of validated self-report measures of emotional experience, or the nature of the limited sample of behavior collected among other study limitations

Morphology and phylogeny of the Elaphostrongylinae : (Nematoda: Protostrongylidae)

The morphology of elaphostrongyline nematodes parasitizing North American cervids was studied using light and scanning electron microscopy in order to improve previous descriptions that were based exclusively on light microscopical studies. Structures including the spicules, gubernaculum, bursa, cephalic region, sensory structures, and female tails of Parelaphostrongylus tenuis, P. odocoilei, P. andersoni, and Elaphostrongylus cervi rangiferi are described. The morphology of E. c. rangiferi as described in this study is similar to previous light microscopical descriptions. The spicules of all three Parelaphostrongylus spp. were alike but differed from those of E. c. rangiferi by having a dorsal branch of the spicule shaft in the distal region that extends to the tip. A membrane spans the area between the branch and the shaft. The corpus of the gubernaculum of P. odocoilei is not split distally as has been described by previous authors, but instead has a longitudinal groove in the distal region. Ventral protuberances associated with the cloaca are present in Parelaphostrongylus spp. but absent in E. c. rangiferi. Sensory papillae and pores associated with the cloaca and the bursal rays are described. In dorsal view, the base of the dorsal ray has a prominent edge of thickened cuticle in P. odocoilei and P. andersoni, whereas in E. c. rangiferi and P. tenuis it is smooth. The female tails of Parelaphostrongylus spp. have a papilla-like projection at their tips. The phylogeny of the Elaphostrongylinae was reconstructed using cladistic techniques. Morphological characters described in this study provide strong evidence for the monophyly of Parelaphostrongylus. The genus is made up of two clades, one containing P. odocoilei and P. andersoni, the other being P. tenuis. The biogeography of the Cervidae of North America in relation to the phylogeny of the Elaphostrongylinae is discussed. The genus Parelaphostrongylus probably coevolved with the genus Odocoileus in the Nearctic, while Elaphostrongylus spp. most likely had a Palearctic origin

The Consequences of Air Density Variations over Northeastern Scotland for Offshore Wind Energy Potential

Hywind-Scotland is a wind farm in Scotland that for many reasons is at the leading edge of technology and is located at a paradigmatic study area for offshore wind energy assessment. The objective of this paper is to compute the Capacity Factor ( CF ) changes and instantaneous power generation changes due to seasonal and hourly fluctuations in air density. For that reason, the novel ERA5 reanalysis is used as a source of temperature, pressure, and wind speed data. Seasonal results for winter show that CF values increase by 3% due to low temperatures and denser air, with economical profit consequences of tens of thousands (US$). Hourly results show variations of 7% in air density and of 26% in power generation via FAST simulations, emphasizing the need to include air density in short-term wind energy studying.This work was financially supported by the Spanish Government through the MINECO project CGL2016-76561-R, (MINECO/ERDF, UE) and the University of the Basque Country (UPV/EHU, GIU 17/002). ERA5 hindcast data were downloaded at no cost from the Copernicus Climate Data Store. All the calculations and plots were made using R: https://www.r-project.org

Aggregation, Integration, Cooperation. The Three Imperatives of New York University’s E-book Strategy

The article reports on the decision of New York University to develop a policy for its electronic book collection (EBC) that addresses the changing needs of library users, following its expansion in Abu Dhabi and Shanghai. Topics discussed include the implementation of the strategies for aggregation, cooperation and integration of the EBC, outline of an acquisition model and challenges encountered in the negotiation process