Thematische Bibliographien / Active sonar systems

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Auswahl der wissenschaftlichen Literatur zum Thema „Active sonar systems“

Autor: Grafiati

Veröffentlicht am 29. Juni 2021

Zuletzt aktualisiert am 13. Februar 2022

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Zeitschriftenartikel zum Thema "Active sonar systems"

Zurk, Lisa, Jorge Quijano, Manish Velankar und Dan Rouseff. „Bistatic invariance for active sonar systems“. Journal of the Acoustical Society of America 120, Nr. 5 (November 2006): 3221. http://dx.doi.org/10.1121/1.4788183.

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Soules, Mary E., und Joshua B. Broadwater. „Featureless classification for active sonar systems.“ Journal of the Acoustical Society of America 127, Nr. 3 (März 2010): 2042. http://dx.doi.org/10.1121/1.3385378.

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La Cour, Brian R., Kevin Johnson und Son Quach. „Multisensor registration for distributed active sonar systems“. Journal of the Acoustical Society of America 116, Nr. 4 (Oktober 2004): 2647. http://dx.doi.org/10.1121/1.4785564.

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Jiang, Jiajia, Xianquan Wang, Fajie Duan, Chunyue Li, Xiao Fu, Tingting Huang, Lingran Bu, Ling Ma und Zhongbo Sun. „Bio-Inspired Covert Active Sonar Strategy“. Sensors 18, Nr. 8 (26.07.2018): 2436. http://dx.doi.org/10.3390/s18082436.

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The covertness of the active sonar is a very important issue and the sonar signal waveform design problem was studied to improve covertness of the system. Many marine mammals produce call pulses for communication and echolocation, and existing interception systems normally classify these biological signals as ocean noise and filter them out. Based on this, a bio-inspired covert active sonar strategy was proposed. The true, rather than man-made sperm whale, call pulses were used to serve as sonar waveforms so as to ensure the camouflage ability of sonar waveforms. A range and velocity measurement combination (RVMC) was designed by using two true sperm whale call pulses which had excellent range resolution (RR) and large Doppler tolerance (DT). The range and velocity estimation methods were developed based on the RVMC. In the sonar receiver, the correlation technology was used to confirm the start and end time of sonar signals and their echoes, and then based on the developed range and velocity estimation method, the range and velocity of the underwater target were obtained. Then, the RVMC was embedded into the true sperm whale call-train to improve the camouflage ability of the sonar signal-train. Finally, experiment results were provided to verify the performance of the proposed method.

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Kim, Suhwan, Bonhwa Ku, Wooyoung Hong und Hanseok Ko. „Performance comparison of target localization for active sonar systems“. IEEE Transactions on Aerospace and Electronic Systems 44, Nr. 4 (Oktober 2008): 1371–80. http://dx.doi.org/10.1109/taes.2008.4667715.

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Hjelmervik, Karl Thomas, und Geir Helge Sandsmark. „In ocean evaluation of low frequency active sonar systems“. Journal of the Acoustical Society of America 123, Nr. 5 (Mai 2008): 3434. http://dx.doi.org/10.1121/1.2934216.

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Xu, Luzhou, Jian Li und Akshay Jain. „Impact of strong direct blast on active sonar systems“. IEEE Transactions on Aerospace and Electronic Systems 51, Nr. 2 (April 2015): 894–909. http://dx.doi.org/10.1109/taes.2014.140442.

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Lepper, Paul A., und Denise Risch. „Sonar signal analysis: Biological consequences of out-of-band acoustic signals from active sonar systems“. Journal of the Acoustical Society of America 144, Nr. 3 (September 2018): 1920. http://dx.doi.org/10.1121/1.5068410.

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Stergiopoulos, Stergios. „Implementation of adaptive processing schemes in active and passive sonar systems“. Journal of the Acoustical Society of America 100, Nr. 4 (Oktober 1996): 2853. http://dx.doi.org/10.1121/1.416780.

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Kwak, ChulHyun, Myoung Jun Cheong und Jae-Kyun Ahn. „A clutter reduction algorithm based on clustering for active sonar systems“. Journal of the Acoustical Society of Korea 35, Nr. 2 (31.03.2016): 149–57. http://dx.doi.org/10.7776/ask.2016.35.2.149.

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Dissertationen zum Thema "Active sonar systems"

Ljung, Johnny. „Track Before Detect in Active Sonar Systems“. Thesis, Uppsala universitet, Signaler och system, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-447314.

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Detection of an underwater target with active sonar in shallow waters such as the Baltic sea is a big challenge. This since the sound beams from the sonar will be reflected on the surfaces, sea surface and sea bottom, and the water volume itself which generates reverberation. Reverberation which will be reflected back to the receiver, is strong in intensity which give rise to many false targets in terms of classifying a target in a surveillance area. These false targets are unwanted and a real target might benefit from these miss-classifications in terms of remaining undetected. It is especially hard if the signal-to-noise ratio (SNR) is approaching zero, i.e. the target strength and the reverberation strength are equal in magnitude. The classical approach to a target detection problem is to assign a threshold value to the measurement, and the data point exceeding the threshold is classified as a target. This approach does not hold for low levels of SNR, since a threshold would not have a statistical significance and could lead to neglecting important data. Track-before-detect (TrBD) is a proposed method for low-SNR situations which tracks and detects a target based on unthresholded data. TrBD enables tracking and detecting of weak and/or stealthy targets. Due to the issues with target detection in shallow waters, the hypothesis of this thesis is to investigate the possibility to implement TrBD, and evaluate the performance of it, when applied on a low-SNR target. The TrBD is implemented with a particle filter which is a recursive Bayesian solution to the problem of integrated tracking and detection. The reverberation data was generated by filtering white noise with an Autoregressive filter of order 1. The target is assigned to propagate according to a constant velocity state space model. Two types of TrBD algorithms are implemented, one which is trained on the background and one which is not. The untrained TrBD is able to track and detect the target but only for levels of SNR down to 4dB. Lower SNR leads to the algorithm not being able to distinguish the target signal from the reverberation. The trained TrBD on the other hand, is able to perform very well for levels of SNR down to 0dB, it is able to track and detect the target and neglect the reverberation. For trajectories passing through areas with high reverberation, the target was lost for a short period of time until it could be retracked again. Overall, the TrBD was successfully implemented on the self-generated data and has a good performance for various target trajectories.

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Winter, Thomas A. „Examination of time-reversal acoustic application to shallow water active sonar systems“. Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2000. http://handle.dtic.mil/100.2/ADA378874.

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Carper, Scott Adams. „Low frequency active sonar performance in the Arctic Beaufort Lens“. Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/113758.

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Thesis: S.M. in Oceanographic Engineering, Joint Program in Applied Ocean Science and Engineering (Massachusetts Institute of Technology, Department of Mechanical Engineering; and the Woods Hole Oceanographic Institution), 2017.
Thesis: S.M., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science; and the Woods Hole Oceanographic Institution), 2017.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 885-86).
A newly discovered double ducted acoustic environment present throughout much of the Beaufort Sea in the Arctic has a major effect on active acoustic transmissions. This work performs an in depth analysis of how the lower duct impacts the propagation of various active signals used commonly for acoustic communications or active sonar. First, this thesis performs a thorough modal analysis of the effect of the double ducted environment on long range propagation of a 300 Hz and 3500 Hz pulse. Signal excess is determined for the two different source pulses to quantify the effect of the lower duct on noise and SNR. Finally, channel capacity is calculated for the two frequency bands to evaluate operational impacts of the lower duct on acoustic communication systems in the Arctic.
by Scott Adams Carper
S.M. in Oceanographic Engineering
S.M.

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Hassan, Marwa M. „Framework for active solar collection systems“. Diss., Virginia Tech, 2003. http://hdl.handle.net/10919/28048.

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A framework that presents a new methodology for design-evaluation of active solar collection systems was developed. Although this methodology emphasizes the importance of detailed modeling for accurate prediction of building performance, it also presents a process through which the detailed modeling results can be reused in a simplified iterative procedure allowing the designer the flexibility of revising and improving the preliminary design. For demonstration purposes, the framework was used to design and evaluate two case studies located in Blacksburg (VA) and Minneapolis (MN). These locations were selected because they both represent a cold weather region; presenting a need for using solar energy for heating and hot water requirements. Moreover, the cold weather in Blacksburg is not as severe as in Minneapolis. Therefore, the two cases will result in different thermal loading structures enabling the framework validation process. The solar collection system supplying both case studies consisted of a low temperature flat plate solar collector and storage system. Thermal performance of the case study located in Blacksburg was conducted using detailed modeling evaluation techniques; while thermal performance of the case study located in Minneapolis was conducted using a simplified modeling evaluation technique. In the first case study, hourly evaluation of the thermal performance of the solar collection system was accomplished using finite element (FE) analysis, while hourly evaluation of the building thermal performance was made using Energy Plus software. The results of the finite element analysis were used to develop a statistical predictive design equation. The energy consumption for the second case study was calculated using the heating design day method and the energy collection for that case study was calculated using the predictive design equation developed from the first case study results. Results showed that, in the case of the building located in Blacksburg, the solar collection system can supply an average of 85% of the buildingâ s heating and hot water requirements through out the year. In the case of the building located in Minneapolis, the solar collection system can supply an average of 56% of the buildingâ s heating and hot water requirements through out the year given no night time window insulation and using similar insulation thicknesses for both cases.
Ph. D.

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Westman, Peter, und Mikael Andersson. „Design of behavior classifying and tracking system with sonar“. Thesis, Linköping University, Department of Electrical Engineering, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-11495.

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The domain below the surface in maritime security is hard to monitor with conventional methods, due to the often very noisy environment. In conventional methods the measurements are thresholded in order to distinguish potential targets. This is not always a feasible way of treating measurements. In this thesis a system based on raw measurements, that are not thresholded, is presented in order to track and classify divers with an active sonar. With this system it is possible to detect and track weak targets, even with a signal to noise ratio that often goes below 0 dB.

The system in this thesis can be divided into three parts: the processing of measurements, the association of measurements to targets and the classification of targets. The processing of measurements is based on a particle filter using Track Before Detect (TBD). Two algorithms for association of measurements, Joint Probabilistic Data Association (JPDA) and Highest Probability Data Association (HPDA), have been implemented. The classification of targets is done using an assumed novel approach. The system is evaluated by doing simulations with approximately 8 hours of recorded data, where divers are present at nine different times. The simulations are done a number of times to catch The classification rate is high and the false alarm rate is low.

Undervattensdomänen är svår att övervaka i marina säkerhetssystem med sedvanliga metoder, på grund av den brusiga miljön. I traditionella metoder trösklas mätningarna för att urskilja potentiella mål. Detta är inte alltid ett godtagbart sätt att behandla mätningar på. I den här rapporten presenteras ett system baserat på behandling av rå mätdata, som inte trösklas, för att spåra och klassificera dykare med en aktiv sonar. Med detta system är det möjligt att detektera och spåra svaga mål, trots att signal till brus förhållandet ofta går under 0 dB.

Systemet i den här rapporten kan delas upp i tre delar: behandling av mätningar, association av mätningar till mål samt klassificering av mål. Behandlingen av mätningarna görs med ett partikelfilter som använder Track Before Detect (TBD). Två algoritmer för associering av mätningar, Joint Probabilistic Data Association (JPDA) och Highest Probability Data Association (HPDA), har implementerats. Klassificeringen av mål görs med en egenutvecklad metod som inte har hittats i existerande dokumentation. Systemet utvärderas genom att simuleringar görs på ungefär 8 timmar inspelad data, där dykare är närvarande vid nio olika tillfällen. Simuleringarna görs ett antal gånger för att fånga upp stokastiska beteenden. Andelen lyckade klassificeringar är hög och andelen falsklarm är låg.

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Flores, Garcia Erick. „Simulation of attitude and orbital disturbances acting on ASPECT satellite in the vicinity of the binary asteroid Didymos“. Thesis, Luleå tekniska universitet, Rymdteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-62007.

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Asteroid missions are gaining interest from the scientific community and many new missions are planned. The Didymos binary asteroid is a Near-Earth Object and the target of the Asteroid Impact and Deflection Assessment (AIDA). This joint mission, developed by NASA and ESA, brings the possibility to build one of the first CubeSats for deep space missions: the ASPECT satellite. Navigation systems of a deep space satellite di er greatly from the common planetary missions. Orbital environment close to an asteroid requires a case-by-case analysis. In order to develop the Attitude Determination Control System (ADCS) for the mission, one needs detailed information about orbital disturbances in the vicinity of the asteroid. This work focuses on the development of a simulator that characterises the orbital disturbances a ecting the ASPECT satellite in the space environment near the Didymos asteroid. In this work, a model of orbital conditions and disturbances near the Didymos system was defined. The model integrates several classical and modern models of spacecraft motion and disturbance. An existing Low Earth Orbit (LEO) simulator was modified and updated accordingly to the ASPECT mission scenario. The developed simulator can be used to analyse the disturbances to be counteracted by the ADCS of the ASPECT satellite. The objective of the study was to quantify the e ect of both non-gravitational and gravitational disturbances. The simulator was used to analyse di erent orbit scenarios related to the period of the mission and to the relative distance between the spacecraft and the asteroid system. In every scenario, the solar radiation pressure was found to be the strongest of the disturbance forces. With the developed simulator, suitable spacecraft configurations and control systems can be chosen to mitigate the e ect of the disturbances on the attitude and orbit of the ASPECT satellite.

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Reynell, M. J. W. „An investigation into the sensitivity of the performance of an active solar heating system to the control strategy employed“. Thesis, University of Bath, 1985. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.353765.

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The aim of this thesis was to investigate and challenge current thinking regarding the sensitivity of the thermal performance of active solar water heating systems to the control strategy employed, with particular attention to the effect of the control temperature differential settings between the solar absorber plate and the solar store at which the circulating pump is switched on and off (dTon and dToff). A mathematical analysis suggested that the performance should be more sensitive to the above parameters than is generally believed. The theoretical appraisal also suggested a relationship for the ratio dTon/dToff required for stable pump control. Measured data from a large-scale solar heating field trial were carefully correlated with the predictions of a computer model. The calibrated model was then used to carry out a sensitivity analysis into the effect of altering the control criteria. The results have shown that, contrary to current thinking, the long-term thermal performance of the system is significantly impaired by the use of a pump switch-on criterion (dTon) higher than 6°K, and that the sensitivity to this parameter increases with increasing dTon. The results have also revealed that the heat losses throughout the system are five or six times higher than theoretical calculations based on the insulation manufacturers' specifications predict. This is not an isolated result, but has been experienced on other monitored installations, and the implication is that the quoted figures for insulation performance (which are derived from tests under tightly controlled laboratory conditions) are extremely difficult to achieve in practice. It is argued that the above two observations are linked, and that a high switch-on criterion leads to significant amounts of collectable solar radiation being wasted as the collector absorber plate loses heat to the surrounding air without reaching a temperature sufficient to turn the circulating pump on. The effect of the control settings on pump switching stability was also investigated, and, whilst the point at which instability occurred did not agree precisely with the theoretical value, the general relationship between the ratio dTon/dToff and the number of pump switching cycles per year supported the mathematical hypothesis. The discrepancy was attributed to the difficulty of measuring the collector overall heat loss coefficient, U1, precisely. For the installation under study it was found that a value of dTon/dToff above 8 would ensure stable pump control. Interpreting optimum performance in terms of both annual solar energy output and pump switching stability, the combination of all the above results led to the general recommendation that a pump switch-on setting of 4-6°K with a switch-off setting of 0.1-0.5°K should be employed to achieve optimum performance of a solar water heating system utilising flat plate solar collectors in the UK. The switch-on criterion of 4-6°K can be achieved reasonably easily by the use of standard, inexpensive controllers and nickel-based temperature sensors. However, such controllers are not capable of consistently resolving temperature differentials to the degree required to meet the switch-off criterion of 0.1-0.5°K over the full operating temperature range. For large installations, therefore, the use of high quality controllers with calibrated platinum resistance thermometers as temperature sensors will prove cost-effective and is strongly recommended.

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Ghosh, Shibani. „A Real-time Management of Distribution Voltage Fluctuations due to High Solar Photovoltaic (PV) Penetrations“. Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/74424.

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Due to the rapid growth of grid-tied solar photovoltaic (PV) systems in the generation mix, the distribution grid will face complex operational challenges. High PV penetration can create overvoltages and voltage fluctuations in the network, which are major concerns for the grid operator. Traditional voltage control devices like switched capacitor banks or line voltage regulators can alleviate slow-moving fluctuations, but these devices need to operate more frequently than usual when PV generation fluctuates due to fast cloud movements. Such frequent operations will impact the life expectancy of these voltage control devices. Advanced PV inverter functionalities enable solar PV systems to provide reliable grid support through controlled real injection and/or reactive power compensation. This dissertation proposes a voltage regulation technique to mitigate probable impacts of high PV penetrations on the distribution voltage profile using smart inverter functionalities. A droop-based reactive power compensation method with active power curtailment is proposed, which uses the local voltage regulation at the inverter end. This technique is further augmented with very short-term PV generation forecasts. A hybrid forecasting algorithm is proposed here which is based on measurement-dependent dynamic modeling of PV systems using the Kalman Filter theory. Physical modeling of the PV system is utilized by this forecasting algorithm. Because of the rise in distributed PV systems, modeling of geographic dispersion is also addressed under PV system modeling. The proposed voltage regulation method is coordinated with existing voltage regulator operations to reduce required number of tap-change operations. Control settings of the voltage regulators are adjusted to achieve minimal number of tap-change operations within a predefined time window. Finally, integration of energy storage is studied to highlight the value of the proposed voltage regulation technique vis-à-vis increased solar energy use.
Ph. D.

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Raffaelli, Tatiana Ferreira. „Previsão de atividade solar a partir da configuração dos campos magnéticos fotosféricos“. Universidade Presbiteriana Mackenzie, 2007. http://tede.mackenzie.br/jspui/handle/tede/1480.

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Made available in DSpace on 2016-03-15T19:38:06Z (GMT). No. of bitstreams: 1 Tatiana Ferreira Raffaelli.pdf: 1372071 bytes, checksum: 274f2a97f290810c43d6e7c6e0730d1a (MD5) Previous issue date: 2007-09-18
The existence of a highly reliable prediction system to detect the occurrence of large solar flares (class X) is still an unsolved problem. Despite many studies performed so far, no such a system has been found yet. In this work, we have developed a method using Bayesian Network - an Artificial Intelligence technique for the detection of giant solar flares. The Bayesian Networks software learned the relation among the variables that describe the sunspots within an active region and built a network with the relationships among them based on conditional probabilities. The studies were divided into two stages one to detect whether the sunspot would produce a big flare or not and another phase where some networks were built to discover the day the flare would occur. The first phase results were very satisfactory reaching a reliability of 77%. The second phase was more complex and the results were about 77% (with day constraints) and 54% (a wider range of days).
A existência de um sistema de previsão, de alta confiabilidade, para a detecção de ocorrência de grandes explosões solares (classe X) ainda é um problema sem solução. Existem diversos estudos nesta área, porém ainda não foi encontrado nenhum sistema eficiente. Para este trabalho foi desenvolvido um método utilizando-se redes Bayesianas, técnica de Inteligência Artificial, para a previsão das grandes flares (explosões) solares. O software de redes Bayesianas aprendeu a relação entre as variáveis que descrevem as regiões ativas e constroem uma rede com os relacionamentos entre elas baseados em probabilidades condicionais. Os estudos foram divididos em duas etapas, uma rede para detectar se a mancha solar irá produzir uma grande explosão ou não, e uma outra etapa em que foram construídas redes para prever o dia em que a explosão irá ocorrer. Os resultados obtidos na primeira etapa foram bem satisfatórios, atingindo 84% de confiabilidade. Já a segunda etapa do trabalho mostrou-se mais complexa e os resultados obtidos foram de 77% (com restrições de dias) e 54% (sem restrições de dia).

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Coste, Marianne. „Les processus sédimentaires, depuis la pente continentale jusqu'au bassin, en contexte de tectonique active : analyse comparée entre la Marge Calabro-Ionienne et la Marge Ligure durant les derniers 5 Ma“. Phd thesis, Université Nice Sophia Antipolis, 2014. http://tel.archives-ouvertes.fr/tel-01062293.

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Les marges continentales, passives ou actives, sont la principale voie de transfert sédimentaire entre le plateau continental et le bassin océanique profond et les plaines abyssales. Les pentes continentales sont le siège de processus d'érosion/dépôt sous le contrôle de transfert de flux particulaires continentaux chenalisés par des structures érosives, telles que les canyons sous‐marins, puis redistribues à l'ensemble de la marge. Les canyons érodent fortement les pentes continentales et contribuent à l'évolution de leur morphologie au cours du temps. On retrouve cependant des canyons sous‐marins qui ne sont pas en relation avec la présence d'un réseau fluviatile. De ce fait, la formation et l'évolution des canyons sous‐marins sont encore peu comprises. Ce travail de thèse s'intéresse aux processus de formation et d'évolution de six canyons sous-marins sur la Marge Ouest du Bassin Ligure et à dix systèmes de canyons sur la Marge Calabro-Ionienne. Le but de cette étude est de contraindre les principales caractéristiques morphométriques (longueur, largeur, profondeur, inclinaison, sinuosité), morphologique (éléments architecturaux, configuration) des canyons, de caractériser leur évolution amont‐aval et d'analyser leur structure interne, afin de mieux comprendre l'origine des canyons sous‐marins, leurs mécanismes de construction et leur évolution au cours du temps en relation avec le contexte géologique régional et leurs potentiels bassins versants subaérien. Pour cela, une approche basée sur une analyse morpho-bathymétrique et géophysiques a été mise en œuvre à partir de relevés bathymétriques complets des marges, de profils de sismiques, de Chirp et de SAR.

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Bücher zum Thema "Active sonar systems"

Mansour, Monadl Abd Al-Abbas. Technique of plot-association for active sonar systems. Birmingham: Universityof Birmingham, 1994.

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Winter, Thomas A. Examination of time-reversal acoustic application to shallow water active sonar systems. Monterey, Calif: Naval Postgraduate School, 2000.

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Solar Cooling Workshop (1984 Indian Institute of Technology, Madras). Active solar cooling systems: Proceedings of Solar Cooling Workshop, 1984. Herausgegeben von Chinnappa, J. C. V. 1923-, Indian Institute of Technology (Madras, India). Dept. of Mechanical Engineering. und James Cook University of North Queensland. Dept. of Civil and Systems Engineering. [Townsville, Queensland, Australia: James Cook University of North Queensland, 1986.

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Passive and active solar heating technology. Englewood Cliffs, NJ: Prentice-Hall, 1985.

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The design and sizing of active solar thermal systems. Oxford [Oxfordshire]: Clarendon Press, 1987.

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Bourges, Bernard. European simplified methods for active solar system design. Dordrecht, The Netherlands: Kluwer Academic Publishers, 1991.

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Minkoff, John. Signals, noise, and active sensors: Radar, sonar, laser radar. New York: Wiley, 1992.

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Graham, Ronald E. Neural network for positioning space station solar arrays. [Washington, DC]: National Aeronautics and Space Administration, 1994.

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Tom, Badgett, Hrsg. Ultimate Unauthorized Nintendo Classic Game Strategies. 2. Aufl. New York: Bantam Books, 1992.

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Tom, Badgett, Hrsg. Ultimate Unauthorized Nintendo Classic Game Strategies. New York, N.Y.: Bantam Books, 1991.

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Buchteile zum Thema "Active sonar systems"

Son, Woo-Sung, YoungKwang Seo, Wan-Jin Kim und Hyoung-Nam Kim. „Analysis on Signal Transmission Methods for Rapid Searching in Active SONAR Systems“. In Lecture Notes in Electrical Engineering, 237–42. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0311-1_40.

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Köhler-Bußmeier, Michael, und Matthias Wester-Ebbinghaus. „SONAR*: A Multi-Agent Infrastructure for Active Application Architectures and Inter-organisational Information Systems“. In Multiagent System Technologies, 248–57. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-04143-3_27.

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Wilhelm, Klaus. „4.1.2.1 Active regions“. In Solar System, 116–23. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-88055-4_6.

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Wilhelm, Klaus. „4.1.2.6 Coronal active regions“. In Solar System, 175–79. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-88055-4_11.

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Howell, J. R. „Active Hybrid Solar Cooling Systems“. In Solar Energy Utilization, 388–408. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3631-7_18.

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Catalano, S. „Flares on Active Binary Systems“. In Magnetodynamic Phenomena in the Solar Atmosphere, 227–34. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-009-0315-9_42.

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Au, Whitlow W. L. „Target Detection Capability of the Active Sonar System“. In The Sonar of Dolphins, 140–76. New York, NY: Springer New York, 1993. http://dx.doi.org/10.1007/978-1-4612-4356-4_8.

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Garg, H. P. „Solar Heating of Buildings: Active Systems“. In Advances in Solar Energy Technology, 1–102. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3795-6_1.

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Tiwari, G. N., und Lovedeep Sahota. „Thermal Modeling of Active Solar-Distillation Systems“. In Advanced Solar-Distillation Systems, 211–52. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-4672-8_5.

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Schmidt, R., H. Arends, K. Torkar und N. Valanvanoglou. „Novel Methods for Active Spacecraft Potential Control“. In Solar System Plasma Physics, 261–65. Washington, D. C.: American Geophysical Union, 2013. http://dx.doi.org/10.1029/gm054p0261.

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Konferenzberichte zum Thema "Active sonar systems"

Soul, M. E., und J. B. Broadwater. „Featureless classification for active sonar systems“. In OCEANS 2010 IEEE - Sydney. IEEE, 2010. http://dx.doi.org/10.1109/oceanssyd.2010.5603657.

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Hempel, Christian G. „Track Initialization for Multi-Static Active Sonar Systems“. In OCEANS 2007 - Europe. IEEE, 2007. http://dx.doi.org/10.1109/oceanse.2007.4302458.

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Hempel, Christian. „Adaptive Track Detection for Multi-Static Active Sonar Systems“. In OCEANS 2006. IEEE, 2006. http://dx.doi.org/10.1109/oceans.2006.307035.

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Sang, Enfang, Zhengyan Shen, Chang Fan und Yuanshou Li. „Sonar image segmentation based on implicit active contours“. In 2009 IEEE International Conference on Intelligent Computing and Intelligent Systems (ICIS 2009). IEEE, 2009. http://dx.doi.org/10.1109/icicisys.2009.5357710.

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Hague, David A., und John R. Buck. „A generalized Sinusoidal Frequency Modulated waveform for active sonar“. In 2012 46th Asilomar Conference on Signals, Systems and Computers. IEEE, 2012. http://dx.doi.org/10.1109/acssc.2012.6489140.

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Scharf, Louis L., und Ali Pezeshki. „Virtual Array Processing for Active Radar and Sonar Sensing“. In 2006 Fortieth Asilomar Conference on Signals, Systems and Computers. IEEE, 2006. http://dx.doi.org/10.1109/acssc.2006.354847.

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Gianelli, Christopher, Luzhou Xu und Jian Li. „Active sonar systems in the presence of strong direct blast“. In OCEANS 2015 - Genova. IEEE, 2015. http://dx.doi.org/10.1109/oceans-genova.2015.7271386.

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Abraham, D. A. „Probability of false alarm estimation in oversampled active sonar systems“. In 1999 IEEE International Conference on Acoustics, Speech, and Signal Processing. Proceedings. ICASSP99 (Cat. No.99CH36258). IEEE, 1999. http://dx.doi.org/10.1109/icassp.1999.761315.

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Wang, I.-Jeng, Jong Hyun Lim und Andreas Terzis. „Energy-efficient sensor management in multi-static active sonar networks“. In 2008 42nd Asilomar Conference on Signals, Systems and Computers. IEEE, 2008. http://dx.doi.org/10.1109/acssc.2008.5074695.

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Song, Seung-Min, In-Dong Kim, Byung-Hwa Lee und Jeong-Min Lee. „Design of High-Efficiency High-Power Transmitter for Active Sonar“. In 2018 21st International Conference on Electrical Machines and Systems (ICEMS). IEEE, 2018. http://dx.doi.org/10.23919/icems.2018.8548993.

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Berichte der Organisationen zum Thema "Active sonar systems"

Wallace, Sean, Scott Lux, Constandinos Mitsingas, Irene Andsager und Tapan Patel. Performance testing and modeling of a transpired ventilation preheat solar wall : performance evaluation of facilities at Fort Drum, NY, and Kansas Air National Guard, Topeka, KS. Engineer Research and Development Center (U.S.), September 2021. http://dx.doi.org/10.21079/11681/42000.

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This work performed measurement and verification of installed, operational solar wall systems at Fort Drum, NY, and Forbes Field, Air National Guard, Topeka, KS. Actual annual savings were compared estimated savings generated by a solar wall modeling tool (RETScreen). A comparison with the RETScreen modeling tool shows that the measured actively heated air provided by the solar wall provides 57% more heat than the RETScreen tool predicted, after accounting for boiler efficiency. The solar wall at Fort Drum yields a net savings of $851/yr, for a simple payback of 146 years and a SIR of 0.16. RETScreen models indicate that the solar wall system at Forbes Field, Kansas Air National Guard, Topeka, KS saves $9,350/yr, for a simple payback of 58.8 years and a SIR of 0.34. Although results showed that, due to low natural gas prices, the Fort Drum system was not economically viable, it was recommended that the system still be used to meet renewable energy and fossil fuel reduction goals. The current system becomes economical (SIR 1.00) at a natural gas rate of $16.00/MMBTU or $1.60 /therm.

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Short, W. D. Method for including operation and maintenance costs in the economic analysis of active solar energy systems. Office of Scientific and Technical Information (OSTI), August 1986. http://dx.doi.org/10.2172/5366867.

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Herczfeld, P., R. Fischl und J. Helferty. Research on the control of active solar space conditioning systems, Phase 2: Volume 1, Summary of objectives and accomplishments: Final report. Office of Scientific and Technical Information (OSTI), Juli 1986. http://dx.doi.org/10.2172/5913592.

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Atkinson, Dan, und Alex Hale, Hrsg. From Source to Sea: ScARF Marine and Maritime Panel Report. Society of Antiquaries of Scotland, September 2012. http://dx.doi.org/10.9750/scarf.09.2012.126.

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The main recommendations of the panel report can be summarised under four headings: 1. From Source to Sea: River systems, from their source to the sea and beyond, should form the focus for research projects, allowing the integration of all archaeological work carried out along their course. Future research should take a holistic view of the marine and maritime historic environment, from inland lakes that feed freshwater river routes, to tidal estuaries and out to the open sea. This view of the landscape/seascape encompasses a very broad range of archaeology and enables connections to be made without the restrictions of geographical or political boundaries. Research strategies, programmes From Source to Sea: ScARF Marine and Maritime Panel Report iii and projects can adopt this approach at multiple levels; from national to site-specific, with the aim of remaining holistic and cross-cutting. 2. Submerged Landscapes: The rising research profile of submerged landscapes has recently been embodied into a European Cooperation in Science and Technology (COST) Action; Submerged Prehistoric Archaeology and Landscapes of the Continental Shelf (SPLASHCOS), with exciting proposals for future research. Future work needs to be integrated with wider initiatives such as this on an international scale. Recent projects have begun to demonstrate the research potential for submerged landscapes in and beyond Scotland, as well as the need to collaborate with industrial partners, in order that commercially-created datasets can be accessed and used. More data is required in order to fully model the changing coastline around Scotland and develop predictive models of site survival. Such work is crucial to understanding life in early prehistoric Scotland, and how the earliest communities responded to a changing environment. 3. Marine & Maritime Historic Landscapes: Scotland’s coastal and intertidal zones and maritime hinterland encompass in-shore islands, trans-continental shipping lanes, ports and harbours, and transport infrastructure to intertidal fish-traps, and define understanding and conceptualisation of the liminal zone between the land and the sea. Due to the pervasive nature of the Marine and Maritime historic landscape, a holistic approach should be taken that incorporates evidence from a variety of sources including commercial and research archaeology, local and national societies, off-shore and onshore commercial development; and including studies derived from, but not limited to history, ethnology, cultural studies, folklore and architecture and involving a wide range of recording techniques ranging from photography, laser imaging, and sonar survey through to more orthodox drawn survey and excavation. 4. Collaboration: As is implicit in all the above, multi-disciplinary, collaborative, and cross-sector approaches are essential in order to ensure the capacity to meet the research challenges of the marine and maritime historic environment. There is a need for collaboration across the heritage sector and beyond, into specific areas of industry, science and the arts. Methods of communication amongst the constituent research individuals, institutions and networks should be developed, and dissemination of research results promoted. The formation of research communities, especially virtual centres of excellence, should be encouraged in order to build capacity.

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