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Letteratura scientifica selezionata sul tema "Transmission Devices"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 30 luglio 2024

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Articoli di riviste sul tema "Transmission Devices"

Peng, Zhang Zhu, e Bo Yin. "Research on Human Implantable Wireless Energy Transfer System". Applied Mechanics and Materials 624 (agosto 2014): 405–9. http://dx.doi.org/10.4028/www.scientific.net/amm.624.405.

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Advances in medical technology and promote the human implantable wireless energy transfer devices are widely used. Traditional human implantable wireless energy transfer device have some problems of low charging efficiency, blindly charging and data transmission difficult. On the basis of the conventional electromagnetic induction, in this paper, we proposed the use of magnetically coupled resonant way on human implantable device for charging, this method can greatly improve the efficiency of wireless charging. The system gets the CPU’s unique ID of human implantable devices to identifying the device. We can artificially control human implantable device’s charging device number, so as to solve the problems caused by the blind charge. Meanwhile, the system uses an electromagnetic carrier approach for data transmission, both to simplify the complexity of hardware devices and improve the communication efficiency of the device.

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Zhu, Zhen, Qinbo Zhang, Long Chen, Xiang Tian e Yingfeng Cai. "Optimization Analysis on the Transmission Characteristics of Multipurpose Power Transmission Devices". Energies 16, n. 19 (7 ottobre 2023): 6989. http://dx.doi.org/10.3390/en16196989.

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Particularly crucial throughout the mode transition procedure is the transmission properties of hydro–mechanical composite transmission devices. This paper describes a multipurpose power transmission device that integrates hydrostatic, hydro-mechanical, and mechanical transmission and mainly discusses the transmission characteristic optimization problem from the perspective of speed regulation characteristics, shift strategy, and efficiency characteristics. The kinematic and dynamic analysis of the transmission system, the assembly scheme, and relevant parameters of the power transmission device are analyzed, and the speed regulation characteristic curve is obtained. The shift strategy of power transmission devices involving clutches and brakes during the whole speed regulation process and the best switch time of each component are found. The efficiency expression of the static pressure system is obtained from the efficiency model of the pump-control-motor system, and the efficiency of the multi-purpose power transmission device is obtained using the efficiency definition method. The fitting curves of hydrostatic system efficiency are determined using experimental data, and the efficiency of the hydro–mechanical composite power transmission system is obtained using the conversion mechanism method. The results show that the shift quality of power transmission devices can be improved greatly by controlling the switch sequence of clutches and brakes reasonably.

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Brown, J. M. "Transmission electron microscopy of semiconductor devices". Proceedings, annual meeting, Electron Microscopy Society of America 44 (agosto 1986): 722–23. http://dx.doi.org/10.1017/s042482010014498x.

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The search for further miniaturization in the semiconductor industry has resulted in the reduction in the dimensions of devices to a size which can no longer be effectively seen by the conventional methods of light microscopy. The use of both transmission and scanning electron microscopy in the field of silicon device characterization has now become an essential ingredient of the design and manufacture of new technologies. It is often the only way in which a device designer can know for certain whether the manufacturing process is producing the required structure. Cross-sectional TEM has therefore become an integral part of both quality control and development.One of the most important areas which resulted in the increased importance of TEM in the semiconductor device field was the development of sample preparation techniques which enable cross-sections through layers of widely differing compositions that are found in the devices structures.

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Wu, Tin-Yu, Ren-Hung Hwang, Abhishek Vyas, Chia-Yiu Lin e Chi-Ruei Huang. "Persistent Periodic Uplink Scheduling Algorithm for Massive NB-IoT Devices". Sensors 22, n. 8 (8 aprile 2022): 2875. http://dx.doi.org/10.3390/s22082875.

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Narrowband Internet of Things (NB-IoT) is one of the low-power wide-area network (LPWAN) technologies that aim to support enormous connections, featuring wide-area coverage, low power consumption, and low costs. NB-IoT could serve a massive number of IoT devices, but with very limited radio resources. Therefore, how to enable a massive number of IoT devices to transmit messages periodically, and with low latency, according to transmission requirements, has become the most crucial issue of NB-IoT. Moreover, IoT devices are designed to minimize power consumption so that the device battery can last for a long time. Similarly, the NB-IoT system must configure different power-saving mechanisms for different types of devices to prolong their battery lives. In this study, we propose a persistent periodic uplink scheduling algorithm (PPUSA) to assist a plethora of Internet of Things (IoT) devices in reporting their sensing data based on their sensing characteristics. PPUSA explicitly considers the power-saving mode and connection suspend/resume procedures to reduce the IoT device’s power consumption and processing overhead. PPUSA allocates uplink resource units to IoT devices systematically so that it can support the periodic–uplink transmission of a plethora of IoT devices while maintaining low transmission latency for bursty data. The simulation results show that PPUSA can support up to 600,000 IoT devices when the NB-IoT uplink utilization is 80%. In addition, it takes only one millisecond for the transmission of the bursty messages.

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Jiang, Haoqing, Yue Wang, Zijian Cui, Xiaoju Zhang, Yongqiang Zhu e Kuang Zhang. "Vanadium Dioxide-Based Terahertz Metamaterial Devices Switchable between Transmission and Absorption". Micromachines 13, n. 5 (30 aprile 2022): 715. http://dx.doi.org/10.3390/mi13050715.

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Terahertz metamaterial plays a significant role in the development of imaging, sensing, and communications. The function of conventional terahertz metamaterials was fixed after fabrication. They can only achieve a single function and do not have adjustable characteristics, which greatly limits the scalability and practical application of metamaterial. Here, we propose a vanadium dioxide-based terahertz metamaterial device, which is switchable between being a transmitter and an absorber. The transmission and absorption characteristics and temperature tunable properties of phase change metamaterials in the terahertz band were investigated. As the temperature of vanadium dioxide is varied between 20 °C and 80 °C, the device can switch between transmission and quad-band resonance absorption at the terahertz frequency range, with a high transmission rate of over 80% and a peak absorbance of 98.3%, respectively. In addition, when the device acts as an absorber, the proposed metamaterial device is tunable, and the modulation amplitude can reach 94.3%; while the device is used as a transmissive device, the modulation amplitude of the transmission peak at 81%. The results indicate that the proposed metamaterial device can promote the applications of terahertz devices, such as switching, modulation, and sensing.

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Burczyk, Robert, Agnieszka Czapiewska, Malgorzata Gajewska e Slawomir Gajewski. "LTE and NB-IoT Performance Estimation Based on Indicators Measured by the Radio Module". Electronics 11, n. 18 (13 settembre 2022): 2892. http://dx.doi.org/10.3390/electronics11182892.

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Monitoring the operating parameters of power grids is extremely important for their proper functioning as well as for ensuring the security of the entire infrastructure. As the idea of the Internet of Things becomes more ubiquitous, there are tools for monitoring the state of the complex electrical grid and means to control it. There are also developed new measuring devices and transmission technologies allowing for the transfer of performed measurements from many places to the network management center. However, there are still no devices that act as data concentrators, which would integrate many transmission technologies and protocols in one device, supporting the communication between those different transmission technologies and which would realize edge computing to assist the management center by prioritizing and combining transmitted data. In this article, the authors present a device that meets the above-mentioned requirements. There are presented research results leading to the development of a decision algorithm, called Multilink—ML, dedicated to the presented device. This algorithm enables the selection between LTE and NB-IoT interfaces for packet transmission without the need to burden the communication system with additional transmissions.

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Mahapatro, Sunil Kumar. "Analysis Of Power Transients In Transmission Devices For Stable Operation". International Journal of Scientific Research 1, n. 3 (1 giugno 2012): 43–45. http://dx.doi.org/10.15373/22778179/aug2012/16.

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Wang, Shi Ming, Yao Li, Hao Zhan e Ka Tian. "A Design for the Wave Power Generation Conversion Device". Advanced Materials Research 1030-1032 (settembre 2014): 472–75. http://dx.doi.org/10.4028/www.scientific.net/amr.1030-1032.472.

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In recent years, the concept of renewable energy has been deepening and popularization, all kinds of new energy technology is developed by leaps and bounds, a growing number of wave energy devices has been put into use and has a very good prospect. In wave power generation equipment, the conversion transmission device is a very important unit, which involving energy transfer, adjustment, stable output and buffer storage, so it need to be well designed to satisfy the operational requirement by taking advantage of different parts. By analyzing the commonly used conversion transmission devices, the characteristics of transmission devices and wave power generation equipments, we proposing a design of a flexible transmission device which can change its torque capacity with clutch automatic control device, in the form of its layout to drive a train of thought for the design wave energy conversion.

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de Oliveira, E. J., J. W. Marangon Lima e J. L. R. Pereira. "Flexible AC transmission system devices: allocation and transmission pricing". International Journal of Electrical Power & Energy Systems 21, n. 2 (febbraio 1999): 111–18. http://dx.doi.org/10.1016/s0142-0615(98)00035-0.

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Chen, Mingzhe, Nir Shlezinger, H. Vincent Poor, Yonina C. Eldar e Shuguang Cui. "Communication-efficient federated learning". Proceedings of the National Academy of Sciences 118, n. 17 (22 aprile 2021): e2024789118. http://dx.doi.org/10.1073/pnas.2024789118.

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Federated learning (FL) enables edge devices, such as Internet of Things devices (e.g., sensors), servers, and institutions (e.g., hospitals), to collaboratively train a machine learning (ML) model without sharing their private data. FL requires devices to exchange their ML parameters iteratively, and thus the time it requires to jointly learn a reliable model depends not only on the number of training steps but also on the ML parameter transmission time per step. In practice, FL parameter transmissions are often carried out by a multitude of participating devices over resource-limited communication networks, for example, wireless networks with limited bandwidth and power. Therefore, the repeated FL parameter transmission from edge devices induces a notable delay, which can be larger than the ML model training time by orders of magnitude. Hence, communication delay constitutes a major bottleneck in FL. Here, a communication-efficient FL framework is proposed to jointly improve the FL convergence time and the training loss. In this framework, a probabilistic device selection scheme is designed such that the devices that can significantly improve the convergence speed and training loss have higher probabilities of being selected for ML model transmission. To further reduce the FL convergence time, a quantization method is proposed to reduce the volume of the model parameters exchanged among devices, and an efficient wireless resource allocation scheme is developed. Simulation results show that the proposed FL framework can improve the identification accuracy and convergence time by up to 3.6% and 87% compared to standard FL.

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Tesi sul tema "Transmission Devices"

DEMENICIS, LUCIENE DA SILVA. "TRANSMISSION LINE TRANSFORMER FOR HIGHSPEED OPTOELECTRONIC DEVICES". PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2004. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=5576@1.

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ERICSSON DO BRASIL
A utilização de transformadores de impedância banda larga possibilita o acoplamento de forma eficiente das linhas convencionais de 50 (ômegas) dos sistemas de alta freqüência aos componentes optoeletrônicos de alta velocidade de baixa impedância, tais como lasers semicondutores (tipicamente com 3 a 5 (ômegas) de resistência de entrada). Uma das principais restrições para a realização de um transformador de impedância planar para uso em sistemas de comunicações ópticas é a sua dimensão física. A fim de se obter um transformador de impedância compacto, de dimensões compatíveis com às dos dispositivos optoeletrônicos, foram analisadas diferentes configurações. Inicialmente foi analisada a configuração coplanar (CPW) utilizando substrato de altíssima constante dielétrica. Devido às limitações encontradas nesta configuração, são propostas, aqui, duas outras soluções. As duas novas configurações propostas associam ao substrato bulk convencional de alumina, filmes de elevada constante dielétrica. Foi desenvolvida uma técnica para caracterizar a constante dielétrica e as perdas dos filmes especialmente fabricados para este trabalho. As análises teóricas mostraram que as configurações propostas apresentam desempenho muito superior ao desempenho das configurações convencionais CPW. Foi implementado o transformador de impedância utilizando uma das soluções propostas e seu desempenho foi avaliado experimentalmente.
Wide-band transmission line impedance transformer enables efficient coupling of 50 (ômegas) transmission line circuits to low impedance high-speed optoelectronic components such as semiconductor lasers (typically with input resistance of 3 to 5 [ômegas]). The physical dimensions of the planar transmission line transformer have to be properly chosen to allow its use in optical communication systems. In order to design a high performance impedance transformer with physical dimensions compatible with optoelectronic components, several possibilities were investigated. A CPW configuration with very high dielectric constant bulk substrate has been analyzed. Simulations have shown some limitations in the performance of this configuration. Then, two new configurations were introduced. Both configurations are obtained using high dielectric constant films and alumina bulk substrate. A new technique has been developed in order to characterize the dielectric constant and the losses of the films specially made for this thesis. Simulations have shown that the performance of both new configurations is much better than the conventional CPW configuration performance. The planar transmission line impedance transformer has been constructed using a new configuration and its performance has been experimentally evaluated.

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Daniel, Isaac H. "Stitched transmission lines for wearable RF devices". Thesis, Loughborough University, 2017. https://dspace.lboro.ac.uk/2134/25581.

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With the rapid growth and use of wearable devices over the last decade, the advantages of using portable wearable devices are now been utilised for day to day activities. These wearable devices are designed to be flexible, low profile, light-weight and smoothly integrated into daily life. Wearable transmission lines are required to transport RF signals between various pieces of wearable communication equipment and to connect fabric based antennas to transmitters and receivers; the stitched transmission line is one of the hardware solutions developed to enhance the connectivity between these wearable devices. Textile manufacturing techniques that employ the use of sewing machines alongside conductive textile materials can be used to fabricate the stitched transmission line. In this thesis the feasibility of using a sewing machine in fabrication of a novel stitched transmission line for wearable devices using the idea of a braided coaxial cable have been examined. The sewing machine used is capable of a zig-zag stitch with approximate width and length within the range of 0-6 mm and 0-4mm respectively. The inner conductor and the tubular insulated layer of the stitched transmission lines were selected as RG 174, while the stitched shields were made up of copper wires and conductive threads from Light Stiches®. For shielding purpose, the structure is stitched onto a denim material with a conductive thread with the aid of a novel manufacturing technique using a standard hardware. The Scattering Parameters of the stitched transmission line were investigated with three different stitch angles 85°, 65° and 31° through simulation and experiments, with the results demonstrating that the stitched transmission line can work usefully and consistently from 0.04 to 4GHz. The extracted Scattering parameters indicated a decrease in DC loss with increased stitch angle and an increase in radiation loses, which tends to increase with increase in frequency. The proposed stitched transmission line makes a viable transmission line but a short stitch length is associated with larger losses through resistance. The DC losses observed are mainly influenced by the resistance of the conductive threads at lower frequencies while the radiation losses are influenced by the wider apertures related to the stitch angles and increase in frequency along the line. The performances of the stitched transmission line with different stitch patterns, when subjected to washing cycles and when bent through curved angles 90° and 180° were also investigated and results presented. Also, the sensitivity of the design to manufacturing tolerances was also considered. First the behaviour of the stitched transmission line with two different substrates Denim and Felt were investigated with the results indicating an insignificant increase in losses with the Denim material. Secondly, the sensitivity of the design with variations in cross section dimensions was investigated using numerical modelling techniques and the results showed that the impedance of the stitched transmission line increases when the cross sectional dimensions are decreased by 0.40mm and decreases when the cross sectional dimensions are increased by 0.40mm. Equally, repeatability of the stitched transmission line with three different stitch angles 85°, 65° and 31° were carried out. The results were seen to be consistent up to 2.5GHz, with slight deviations above that, which are mainly as a result of multiple reflections along the line resulting in loss ripples. The DC resistance of the stitched transmission line with three different stitch angles 85°, 65° and 31° corresponding to the number of stitches 60,90 and 162 were computed and a mathematical relationship was derived for computing the DC resistance of the stitch transmission line for any given number of stitches. The DC resistance computed results of 25.6Ω, 17.3Ω and 13.1Ω, for 31°, 65° and 85° stitch angles, indicated an increase in DC resistance of the stitch with decrease in stitch angle which gives rise to an increase in number of stitches. The transfer impedance of the stitched transmission line was also computed at low frequency (< 1GHz) to be ZT=(0.24+j1.09)Ω, with the result showing the effectiveness of the shield of the stitched transmission line at low frequency (< 1GHz).

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Athanasiadis, Nikolaos P. "Modelling, control and design of Flexible AC Transmission Systems (FACTS), custom power devices and variable speed drives for transmission and distribution architectures". Thesis, University of Strathclyde, 1999. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=21441.

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The main tasks of power electronics in power transmission and distribution systems is to process and control the flow of electric energy by supplying voltages and currents in a form that is suitable for user loads. In recent years, the field of power electronics has experienced a large growth. Electric utilities expected that by the year 2000 over half of the electrical load may be supplied through power electronic systems. In order to take advantage of this highly developed technology a number of detailed modelling procedures and simulation facilities are needed. The work in this thesis is concentrated on modelling, control and design of various power electronic based models for use within transmission and distribution systems. The overall objective is to provide effective methods and tools for assessing the impact of the latest technology based on power electronic devices in the reinforcement of power system networks. The thesis clarifies modelling and control of various variable speed drive models, such as the six-step, PWM and vector control and gives a detailed account of the systematic derivation of equations that are necessary for the dynamic and transient analysis of a multi-machine multi-node power system with associated adjustable speed drives. Simulation of Flexible AC Transmission Systems (FACTS) models has also been developed for a number of devices including: the SVC (Static Var Compensator), the STATCON (Static Condenser) and the UPFC (Unified Power Flow Controller). The methodologies for development of the models are described and a number of case studies are included in order to give a broad overview of the applications and to prove the usefulness of the results. The last part of the thesis includes simulation, control and design of Custom Power Devices for use within distribution system architectures. It starts with a complete control system strategy for the modelling of a solid-state switch and continues with the modelling of a Dynamic Voltage Restorer model, using an innovative control system. The creation of the power electronics models library provides several opportunities for future developments, which are discussed in the concluding sections of the thesis.

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Strobel, Julian [Verfasser]. "Transmission Electron Microscopy on Memristive Devices / Julian Strobel". Kiel : Universitätsbibliothek Kiel, 2019. http://d-nb.info/1185485244/34.

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Heng, Stephen Fook-Geow. "Experimental and theoretical thermal analysis of microelectronic devices". Diss., Georgia Institute of Technology, 1988. http://hdl.handle.net/1853/16694.

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Zeraatzade, Mahbube. "Transmission congestion management by optimal placement of FACTS devices". Thesis, Brunel University, 2010. http://bura.brunel.ac.uk/handle/2438/4710.

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This thesis describes the implementation of the Flexible AC Transmission Systems (FACTS) devices to develop a market-based approach to the problem of transmission congestion management in a Balancing Market. The causes, remedies and pricing methods of transmission congestion are briefly reviewed. Balancing Market exists in markets in which most of the trading is done via decentralized bilateral contracts. In these markets only final adjustments necessary to ensure secure system operation is carried out at a centralized Balancing Market. Each market player can participate in the Balancing Market by submitting offers and bids to increase and decrease its initially submitted active generation output. In this research a method is proposed to reduce costs associated with congestion re-dispatch in a Balancing Market by optimal placement of FACTS devices, and in particular Thyristor Controlled Phase Shifter Transformers (TCPST). The proposed technique is applicable to both Mixed Integer Linear Programming (MILP) and Mixed Integer Non-Linear Programming (MINLP). In the MILP a power system network is represented by a simplified DC power flow under a MILP structure and the Market participants' offers and bids are also represented by linear models. Results show that applications of FACTS devices can significantly reduce costs of congestion re-dispatch. The application of the method based on the MINLP creates a nonlinear and non-convex AC OPF problem that might be trapped in local sub-optima solutions. The reliability of the solution that determines the optimal placement of FACTS devices is an important issue and is carried out by investigation of alternative solvers. The behavior of the MINLP solvers is presented and finally the best solvers for this particular optimization problem are introduced. The application of DC OPF is very common in industry. The accuracy of the DC OPF results is investigated and a comparison between the DC and AC OPF is presented.

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Osuagwu, Ikenna. "Improving multimedia transmission through enhanced multimedia devices / Ikenna Osuagwu". Thesis, North-West University, 2008. http://hdl.handle.net/10394/4101.

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Multimedia transmission is the effective way of transmitting multimedia elements (comprising voice, audio, video, data etc) from one place to the other via internet enabled protocols and other means. The term 'effective' is used because multimedia transmission is a nightmare if the conveyance is not smooth, seamless and efficient. Over time, the world has seen tremendous improvement that started from the era of the first generation of multimedia generation to the point of multimedia transmission. Much has been said and done in this area and the world has become a connected enterprise because of the transmission of multimedia. In spite of these successes that have been recorded in these areas, there are still many challenges facing multimedia transmission. What determines the progress of technology globally is the trends of evolution that multimedia transmission has gone through. An important challenge facing multimedia transmission is one that has been neglected for a long time. There has been deep neglect of the devices that are used in transmission while much emphasis has been on the protocols and the software that are being developed for multimedia transmission. Devices play a very important role in the realization of seamless transmission of media. Lately, the world seems to have realized the fact that devices that do the actual transmission needs more attention. These devices are the ones that do the distribution and the transmission of the multimedia streams or signals. This has been highlighted in a recent research study that was referenced in the Cambridge Handbook of Multimedia Learning that showed that the expectations of meeting the world's target on multimedia has been reduced by half because of problems arising from the inefficiency of multimedia devices and not really from the protocol perspective as earlier perceived. It is inline with the above that this research was titled "improving multimedia transmission through enhanced multimedia devices". Multimedia devices are the end to end units that are used in multimedia transmission. This research investigated the current devices that are being used, their deficiencies and the reasons that make them unstable for multimedia transmission. It focused on the real time multimedia transmission over the internet protocol (IP) through enhancing limited capabilities of the current multimedia devices. This will make way for new studies into newer devices that are better designed for the efficient multimedia flow. It will assure better quality end-to-end solutions in the area of multimedia distribution and transmission. This research is broad enough to cover most of the major areas of multimedia transmission and cut across several industries and technologies. These might include industries that specialize in internet telephony; design and manufacture multimedia devices and multimedia technologies. Despite the huge number of fields that this research cut across, the focus remained unchanged in highlighting this challenge and proffering a solution through enhanced end to end multimedia elements. It is hoped that this research work will contribute to the solution of this area of challenge and bring to fore the work that should be done in this regard. The advantages of improved multimedia transmission cannot be over emphasized as there will be a tremendous reduction in the cost of long distance communication globally and smoother media transmission which makes use of the readily available internet protocols. In spite of these successes that have been recorded in these areas, there are still many challenges facing multimedia transmission. What determines the progress of technology globally is the trends of evolution that multimedia transmission has gone through. An important challenge facing multimedia transmission is one that has been neglected for a long time. There has been deep neglect of the devices that are used in transmission while much emphasis has been on the protocols and the software that are being developed for multimedia transmission. Devices play a very important role in the realization of seamless transmission of media. Lately, the world seems to have realized the fact that devices that do the actual transmission needs more attention. These devices are the ones that do the distribution and the transmission of the multimedia streams or signals. This has been highlighted in a recent research study that was referenced in the Cambridge Handbook of Multimedia Learning that showed that the expectations of meeting the world's target on multimedia has been reduced by half because of problems arising from the inefficiency of multimedia devices and not really from the protocol perspective as earlier perceived. It is inline with the above that this research was titled "improving multimedia transmission through enhanced multimedia devices". Multimedia devices are the end to end units that are used in multimedia transmission. This research investigated the current devices that are being used, their deficiencies and the reasons that make them unstable for multimedia transmission. It focused on the real time multimedia transmission over the internet protocol (IP) through enhancing limited capabilities of the current multimedia devices. This will make way for new studies into newer devices that are better designed for the efficient multimedia flow. It will assure better quality end-to-end solutions in the area of multimedia distribution and transmission. This research is broad enough to cover most of the major areas of multimedia transmission and cut across several industries and technologies. These might include industries that specialize in internet telephony; design and manufacture multimedia devices and multimedia technologies. Despite the huge number of fields that this research cut across, the focus remained unchanged in highlighting this challenge and proffering a solution through enhanced end to end multimedia elements. It is hoped that this research work will contribute to the solution of this area of challenge and bring to fore the work that should be done in this regard. The advantages of improved multimedia transmission cannot be over emphasized as there will be a tremendous reduction in the cost of long distance communication globally and smoother media transmission which makes use of the readily available internet protocols.
Thesis (M.Ing. (Development and Management Engineering))--North-West University, Potchefstroom Campus, 2009.

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Liu, Zhenyu. "Advanced transmission electron microscopy of GaN-based materials and devices". Thesis, University of Cambridge, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.609893.

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Xiao, Shuo Electrical Engineering &amp Telecommunications Faculty of Engineering UNSW. "Transmission power control in body-wearable sensor devices for healthcare monitoring". Publisher:University of New South Wales. Electrical Engineering & Telecommunications, 2008. http://handle.unsw.edu.au/1959.4/41104.

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Emerging body-wearable sensor devices for continuous health monitoring are severely energy constrained and yet required to offer high communication reliability under fluctuating channel conditions. This thesis aims at investigating the opportunities and challenges in the use of dynamic radio transmit power control for prolonging the lifetime of such devices. We first present extensive empirical evidence that the wireless link quality can change rapidly in body area networks, and a fixed transmit power results in either wasted energy (when the link is good) or low reliability (when the link is bad). We then propose a class of schemes feasible for practical implementation that adapt transmit power in real-time based on feedback information from the receiver. We show conservative, balanced, and aggressive adaptations of our scheme that progressively achieve higher energy savings of 14%-30% in exchange for higher potential packet losses (up to 10%). We also provide guidelines on how the parameters can be tuned to achieve the desired trade-off between energy savings and reliability within the chosen operating environment. Finally, we implement and profile our scheme on a MicaZ mote based platform, demonstrating that energy savings are achievable even with imperfect feedback information, and report preliminary results on the ultra-low-power integrated healthcare monitoring platform from our collaborating partner Toumaz Technology. In conclusion, our work shows adaptive radio transmit power control as a low-cost way of extending the battery-life of severely energy constrained body wearable devices, and opens the door to further optimizations customized for specific deployment scenarios.

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Kiani, Mehdi. "Wireless power and data transmission to high-performance implantable medical devices". Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/53396.

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Novel techniques for high-performance wireless power transmission and data interfacing with implantable medical devices (IMDs) were proposed. Several system- and circuit-level techniques were developed towards the design of a novel wireless data and power transmission link for a multi-channel inductively-powered wireless implantable neural-recording and stimulation system. Such wireless data and power transmission techniques have promising prospects for use in IMDs such as biosensors and neural recording/stimulation devices, neural interfacing experiments in enriched environments, radio-frequency identification (RFID), smartcards, near-field communication (NFC), wireless sensors, and charging mobile devices and electric vehicles. The contributions in wireless power transfer are the development of an RFID-based closed-loop power transmission system, a high-performance 3-coil link with optimal design procedure, circuit-based theoretical foundation for magnetic-resonance-based power transmission using multiple coils, a figure-of-merit for designing high-performance inductive links, a low-power and adaptive power management and data transceiver ASIC to be used as a general-purpose power module for wireless electrophysiology experiments, and a Q-modulated inductive link for automatic load matching. In wireless data transfer, the contributions are the development of a new modulation technique called pulse-delay modulation for low-power and wideband near-field data communication and a pulse-width-modulation impulse-radio ultra-wideband transceiver for low-power and wideband far-field data transmission.

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Libri sul tema "Transmission Devices"

Engineers, Society of Automotive, e International Off-Highway & Powerplant Congress & Exposition (1996 : Indianapolis, Ind.), a cura di. Transmission and controls. Warrendale, PA: Society of Automotive Engineers, 1996.

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Weston, Eric Brindley. Automobile transmission systems. 2^a ed. London: Newnes Technical, 1985.

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C, Bill Robert, United States. National Aeronautics and Space Administration. e United States. Army Aviation Research and Technology Activity., a cura di. Advanced transmission studies. [Washington, DC]: National Aeronautics and Space Administration, 1988.

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John, Maten, Anderson Bruce e Society of Automotive Engineers, a cura di. Continuously variable transmission (CVT). Warrendale, Pa: SAE, 2006.

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Institution of Mechanical Engineers (Great Britain), a cura di. Aerospace transmission technology. Bury St Edmunds: Published by Professional Engineering Pub. Ltd. for the Institution of Mechanical Engineers, 1999.

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K, Jurgen Ronald, a cura di. Electronic transmission controls. Warrendale, Pa: Society of Automotive Engineers, 2000.

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Engineers, Society of Automotive, a cura di. Passenger car transmissions. Warrendale, PA: Society of Automotive Engineers, 1985.

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Engineers, Society of Automotive, e SAE World Congress (2006 : Detroit, Mich.), a cura di. Transmission and driveline 2006. Warrendale, Pa: Society of Automotive Engineers, 2006.

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Engineers, Society of Automotive, e SAE International Congress & Exposition (1997 : Detroit, Mich.), a cura di. 1997 Transmission and Driveline Systems Symposium: Transmission systems, components, gears and friction, and fluid materials. Warrendale, PA: Society of Automotive Engineers, 1997.

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Ray, Shaver, e SAE Clutch Standards Committee., a cura di. Manual transmission clutch systems. Warrendale, PA: Society of Automotive Engineers, 1997.

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Più fonti

Capitoli di libri sul tema "Transmission Devices"

Milano, Federico. "Transmission Devices". In Power System Modelling and Scripting, 263–89. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-13669-6_11.

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van de Roer, Theo G. "Transmission lines and microwave circuits". In Microwave Electronic Devices, 202–34. Boston, MA: Springer US, 1994. http://dx.doi.org/10.1007/978-1-4615-2500-4_7.

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Cirillo, M. "Josephson Transmission Lines Coupling". In Nonlinear Superconductive Electronics and Josephson Devices, 297–306. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4615-3852-3_22.

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Borowik, Bohdan. "Matrix Keypad + serial transmission". In Interfacing PIC Microcontrollers to Peripherial Devices, 105–27. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-1119-8_15.

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Pedersen, N. F. "Fluxons in Josephson Transmission Lines". In Superconducting Devices and Their Applications, 369–75. Berlin, Heidelberg: Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-642-77457-7_66.

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Zhang, Xiao-Ping, Christian Rehtanz e Bikash Pal. "FACTS-Devices and Applications". In Flexible AC Transmission Systems: Modelling and Control, 1–30. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-28241-6_1.

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Pulyer, Yuly M. "Magnetic Transmission Line". In Electromagnetic Devices for Motion Control and Signal Processing, 67–180. New York, NY: Springer New York, 1992. http://dx.doi.org/10.1007/978-1-4612-2928-5_3.

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Pulyer, Yuly M. "Electro-magnetic Strip Transmission Line Devices". In Electromagnetic Devices for Motion Control and Signal Processing, 450–63. New York, NY: Springer New York, 1992. http://dx.doi.org/10.1007/978-1-4612-2928-5_9.

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Corvaja, Roberto. "Characterization of Transmission Media and Devices". In Principles of Communications Networks and Systems, 197–257. Chichester, UK: John Wiley & Sons, Ltd, 2011. http://dx.doi.org/10.1002/9781119978589.ch4.

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Feher, Lambert E. "Efficient Microwave Transmission Devices and Measurements". In Energy Efficient Microwave Systems, 23–34. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-92122-6_4.

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Atti di convegni sul tema "Transmission Devices"

Awaji, Y., B. J. Puttnam, J. Sakaguchi, R. S. Luís, J. M. Delgado Mendinueta, W. Klaus e N. Wada. "MCF Transmission Technology". In Photonic Networks and Devices. Washington, D.C.: OSA, 2016. http://dx.doi.org/10.1364/networks.2016.new2c.4.

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Mishra, S. K., L. N. Tripathy e S. C. Swain. "FDST based statcom compensated single circuit transmission line". In 2017 Devices for Integrated Circuit (DevIC). IEEE, 2017. http://dx.doi.org/10.1109/devic.2017.8074053.

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Mishra, S. K., L. N. Tripathy e S. C. Swain. "FDST approach statcom integrated double circuit transmission line". In 2017 Devices for Integrated Circuit (DevIC). IEEE, 2017. http://dx.doi.org/10.1109/devic.2017.8074054.

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Tenorio, A. R. M. "Modelling of FACTS devices". In Sixth International Conference on AC and DC Power Transmission. IEE, 1996. http://dx.doi.org/10.1049/cp:19960381.

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Furukawa, Rei, Keiji Uehara, Satoshi Takahashi, Nobuhiro Ohtsu e Yasuhiro Koike. "Fiber optic transmission of analog signals". In Photonic Devices + Applications, a cura di Jean-Michel Nunzi. SPIE, 2007. http://dx.doi.org/10.1117/12.734030.

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Sinkin, O., A. Turukhin, H. Batshon, M. Mazurczyk, W. Patterson, M. Bolshtyansky, D. Foursa e A. Pilipetskii. "SDM Concepts for Submarine Transmission". In Photonic Networks and Devices. Washington, D.C.: OSA, 2017. http://dx.doi.org/10.1364/networks.2017.neth2b.1.

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Feuer, Mark D. "DOP Modulation for Data Transmission". In Photonic Networks and Devices. Washington, D.C.: OSA, 2021. http://dx.doi.org/10.1364/networks.2021.netu3b.4.

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Cochran, Robert, Eric Parker, Stefanie Gille e Leon Kempner. "Damping Devices for Seismic Protection of Substation Equipment". In Electrical Transmission and Substation Structures 2022. Reston, VA: American Society of Civil Engineers, 2022. http://dx.doi.org/10.1061/9780784484463.042.

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Strbac, G. "FACTS devices in uplift control". In Sixth International Conference on AC and DC Power Transmission. IEE, 1996. http://dx.doi.org/10.1049/cp:19960360.

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Bolonne, S. R. A., A. K. K. Chanaka, G. C. Jayawardhana, I. H. T. D. Lionel e D. P. Chandima. "Wireless power transmission for multiple devices". In 2016 Moratuwa Engineering Research Conference (MERCon). IEEE, 2016. http://dx.doi.org/10.1109/mercon.2016.7480147.

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Rapporti di organizzazioni sul tema "Transmission Devices"

Litzenberger, Wayne, e Val Lava. An Annotated Bibliography of High-Voltage Direct-Current Transmission and Flexible AC Transmission (FACTS) Devices, 1991-1993. Office of Scientific and Technical Information (OSTI), agosto 1994. http://dx.doi.org/10.2172/10170928.

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Litzenberger, Wayne H., Rajiv K. Varma e John D. Flanagan. An Annotated Bibliography of HVDC Transmission and FACTS Devices, 1996-1997. Office of Scientific and Technical Information (OSTI), giugno 1998. http://dx.doi.org/10.2172/296892.

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Frolov, Vladmir, Scott N. Backhaus e Michael Chertkov. Scalable Heuristics for Planning, Placement and Sizing of Flexible AC Transmission System Devices. Office of Scientific and Technical Information (OSTI), luglio 2015. http://dx.doi.org/10.2172/1191123.

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Frolov, Vladimir, Scott Backhaust e Michael Chertkov. Efficient Algorithm for Locating and Sizing Series Compensation Devices in Large Transmission Grids: Model Implementation. Office of Scientific and Technical Information (OSTI), febbraio 2015. http://dx.doi.org/10.2172/1170269.

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Gray. L51594 Review Pipe Integrity--Stress State Measurement Techniques. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), aprile 1989. http://dx.doi.org/10.55274/r0010566.

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Presents a state-of-the-art review of the technologies available for stress measurement in buried pipelines and recommendations regarding further development of such technologies appearing to have favorable application for natural gas transmission service. The technologies are grouped in terms of internal inspection devices, devices requiring external access to the pipe, and those that may be inserted from the ground on the pipeline right of way.

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Frolov, Vladimir, Scott Backhaust e Michael Chertkov. Efficient Algorithm for Locating and Sizing Series Compensation Devices in Large Transmission Grids: Solutions and Applications. Office of Scientific and Technical Information (OSTI), febbraio 2015. http://dx.doi.org/10.2172/1170268.

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Frolov, Vladimir, Scott N. Backhaus e Michael Chertkov. Efficient Algorithm for Locating and Sizing Series Compensation Devices in Large Transmission Grids: Model Implementation (PART 1). Office of Scientific and Technical Information (OSTI), gennaio 2014. http://dx.doi.org/10.2172/1114412.

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Frolov, Vladimir, Scott N. Backhaus e Michael Chertkov. Efficient Algorithm for Locating and Sizing Series Compensation Devices in Large Transmission Grids: Solutions and Applications (PART II). Office of Scientific and Technical Information (OSTI), gennaio 2014. http://dx.doi.org/10.2172/1114413.

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Phillips, Laurence R., Bankim Tejani, Jonathan Margulies, Jason L. Hills, Bryan T. Richardson, Micheal J. Baca e Laura Weiland. Analysis of operations and cyber security policies for a system of cooperating Flexible Alternating Current Transmission System (FACTS) devices. Office of Scientific and Technical Information (OSTI), dicembre 2005. http://dx.doi.org/10.2172/882347.

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Coulson, Wendy, Tom McGrath e James McCarthy. PR-312-16202-R03 Methane Emissions from Transmission and Storage Subpart W Sources. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), settembre 2019. http://dx.doi.org/10.55274/r0011619.

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A 2018 PRCI report evaluated related emissions from compressor seals, isolation valves, and blowdown valves based on direct measurements required by Subpart W of the GHG Reporting Program. This report presents the methane emissions data from 2011 - 2016 for the balance of the Subpart W emission sources, including: facility leaks (other than from compressor isolation valves and blowdown valves), pneumatic controller venting, condensate tank dump valve leakage, and blowdown emissions from stations. Transmission pipeline blowdown emission reporting was added to the EPA regulation in late 2015, and 2016 and 2017 pipeline blowdown data are presented in this report. The objective of the project is to evaluate and analyze the dataset, and compare methane emission estimates from these sources to historical data used by EPA, primarily the emission factors (EFs) from the mid-1990s EPA/Gas Research Institute (GRI) study used by EPA in its annual GHG inventory (GHGi) report. The results and related EFs and analysis of relative contribution from different sources can be used: (1) as an alternative to GHGi EFs for estimating methane emissions for Transmission and Storage (T and S) operations; (2) to document the relative contribution of different T and S methane emission sources; and (3) to identify reductions relative to historical estimates and support more efficient methane mitigation strategies. The Subpart W data for leaks and pneumatic devices are consistently lower than GHGi estimates, and blowdown emissions from compressor stations and transmission pipelines are similar in magnitude to GHGi estimates.

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